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WO2006028147A1 - Appareil de congélation - Google Patents

Appareil de congélation Download PDF

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Publication number
WO2006028147A1
WO2006028147A1 PCT/JP2005/016441 JP2005016441W WO2006028147A1 WO 2006028147 A1 WO2006028147 A1 WO 2006028147A1 JP 2005016441 W JP2005016441 W JP 2005016441W WO 2006028147 A1 WO2006028147 A1 WO 2006028147A1
Authority
WO
WIPO (PCT)
Prior art keywords
heat exchanger
refrigeration
refrigerant
cooling
cooling heat
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2005/016441
Other languages
English (en)
Japanese (ja)
Inventor
Masaaki Takegami
Satoru Sakae
Kenji Tanimoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daikin Industries Ltd
Original Assignee
Daikin Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Daikin Industries Ltd filed Critical Daikin Industries Ltd
Publication of WO2006028147A1 publication Critical patent/WO2006028147A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • F25B1/10—Compression machines, plants or systems with non-reversible cycle with multi-stage compression
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
    • F25B2313/0232—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units with bypasses
    • F25B2313/02321—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units with bypasses during cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
    • F25B2313/02742—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using two four-way valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/07—Details of compressors or related parts
    • F25B2400/075—Details of compressors or related parts with parallel compressors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/22—Refrigeration systems for supermarkets

Definitions

  • the present invention relates to a refrigeration apparatus in which a plurality of heat exchangers for cooling the interior of a refrigerator circuit are provided in series.
  • the first cooling heat that individually cools the two chambers is provided in the refrigerant circuit (210) that circulates the refrigerant and performs a vapor compression refrigeration cycle.
  • the exchanger (221) and the second cooling heat exchanger (222) are connected in series.
  • the refrigerant circuit (210) is provided with a compressor (223), an outdoor heat exchanger (224), and a first capillary tube (225) as an expansion mechanism.
  • the refrigerant circuit (210) passes through the first capillary tube (225), and the depressurized refrigerant bypasses the first cooling heat exchanger (221) to pass through the second cooling heat exchanger (222). It is equipped with a bypass pipe (226) for sending to The bypass pipe (226) is provided with a second capillary tube (227) that gives a predetermined resistance to the refrigerant flowing through the bypass pipe (226).
  • the piping between the first cooling heat exchanger (221) and the second cooling heat exchanger (222) is connected from the first cooling heat exchanger (221) to the second cooling heat exchanger (222).
  • a flow rate adjustment valve (228) for adjusting the refrigerant flow rate is provided.
  • the refrigerant compressed by the compressor (223) dissipates heat into the air and condenses in the outdoor heat exchanger (224).
  • the refrigerant condensed in the outdoor heat exchanger (224) is depressurized to a predetermined pressure by the first capillary tube (225).
  • the flow rate adjustment valve (228) is opened to a predetermined opening.
  • the refrigerant depressurized by the first capillary tube (225) flows through the first cooling heat exchanger (221).
  • the refrigerant absorbs heat from the internal air and evaporates.
  • the refrigerant evaporated in the first cooling heat exchanger (221) passes through the second cooling heat exchanger (222) after passing through the flow rate adjustment valve (228).
  • the second cooling heat exchanger (222) the refrigerant absorbs heat from the internal air and further evaporates.
  • the device (200) opens the flow rate adjustment valve (228) during normal operation, thereby allowing the refrigerant to flow in the order of the first cooling heat exchanger (221) and the second cooling heat exchanger (222). Use the vessel (221,222) to cool the inside of the cabinet.
  • the refrigeration apparatus (200) when the interior of the refrigerator is sufficiently cooled by the first cooling heat exchanger (221), and the cooling of the first cooling heat exchanger (221) becomes unnecessary.
  • the flow rate adjustment valve (228) is fully closed.
  • the refrigerant depressurized by the first capillary tube (225) passes through the noisy pipe (226) and the second capillary tube (227) and bypasses the first cooling heat exchanger (221). It flows into the second cooling heat exchanger (222). Therefore, in this operation, the interior of the cabinet is not cooled by the first cooling heat exchanger (221), and only the second cooling heat exchanger (222) cools the interior.
  • the refrigeration apparatus (200) of Patent Document 1 has the bypass pipe (226) connected to the downstream side of the first kabilary tube (225), which is an expansion mechanism, and is distributed to the bypass pipe (226).
  • the flow rate of the cooling medium By adjusting the flow rate of the cooling medium with the flow rate adjusting valve (228), it is possible to avoid unnecessary cooling from being performed when the first cooling heat exchanger (221) does not need to cool the inside of the cabinet.
  • a refrigeration apparatus as in Patent Document 2 is known.
  • a refrigeration circuit having a refrigeration heat exchanger for cooling the inside of a refrigerator and a refrigeration circuit having a refrigeration heat exchanger for cooling the inside of the freezer are connected in parallel to a heat source side circuit having a main compressor. Yes.
  • the refrigeration circuit is provided with a sub-compressor.
  • the refrigerant circuit of the refrigeration apparatus constitutes a so-called two-stage compression refrigerant circuit in which the refrigeration circuit is on the high stage side and the refrigeration circuit is on the low stage side.
  • the refrigerant flowing through the refrigeration heat exchanger performs a refrigeration cycle using the main compressor as a heat source, and at the same time, the refrigerant flowing through the refrigeration heat exchanger is connected to the low-stage sub-compressor and the high-stage compressor.
  • the refrigeration cycle is performed using the main compressor on the side as a heat source.
  • Patent Document 1 JP 2002-147917
  • Patent Document 2 Japanese Patent Laid-Open No. 2002-228297
  • a plurality of cooling heat exchangers (221, 222) are provided in series.
  • the refrigerant after being depressurized by the first capillary tube (225) is circulated to the first cooling heat exchanger (221) side or the bypass pipe (226) side.
  • the pressure of the refrigerant flowing into the first cooling heat exchanger (221) is determined by the resistance of the first capillary tube (225), and the first cooling heat exchanger (221) It is difficult to adjust the evaporation pressure of the refrigerant, that is, the cooling capacity.
  • the interior cooling by the first cooling heat exchanger (221) becomes unnecessary, and in the operation operation in which the cooling is performed only by the second cooling heat exchanger (222), the second cooling heat exchanger (222) ) Is determined by the resistance of the first capillary tube (225) and the second capillary tube (227), and the evaporation pressure in the second cooling heat exchanger (222), that is, the cooling capacity It becomes difficult to make adjustments. Also, during this operation, for example, a force that may be considered to adjust the flow rate of refrigerant flowing through the bypass pipe (226) by opening a predetermined amount of the flow rate adjustment valve (228). In this case, the first cooling heat exchange Since the refrigerant flows through the vessel (221), useless cooling is performed in the first cooling heat exchanger (221).
  • the present invention has been made in view of power, and an object of the present invention is to provide a refrigeration apparatus in which a plurality of cooling heat exchangers are provided in series with a refrigerant circuit, and are necessary. It is to provide a refrigeration system that can cool the inside of the cabinet only with a simple cooling heat exchanger and can individually adjust the cooling capacity of each cooling heat exchanger.
  • the present invention provides a refrigeration apparatus in which a plurality of cooling heat exchangers are provided in series with a refrigerant circuit, provided with a plurality of expansion mechanisms corresponding to the plurality of cooling heat exchangers, and expanded in the refrigerant circuit. It is designed to bypass the refrigerant before it is depressurized by the mechanism through a predetermined path. is there.
  • the first invention includes first and second cooling heat exchangers (131, 141), a compressor (41, 151), and an expansion mechanism (132, 142) for cooling different interiors.
  • the refrigerant circuit (20) includes a refrigeration apparatus in which the first and second cooling heat exchangers (131, 141) are connected in series.
  • the refrigeration apparatus includes the first expansion mechanism (132) in which the expansion mechanism (132, 142) adjusts the refrigerant pressure flowing into the first cooling heat exchanger (131), and the second cooling heat exchanger.
  • a second expansion mechanism (142) for adjusting the refrigerant pressure flowing into (141).
  • One end of the refrigerant circuit (20) is connected to the inflow end of the first expansion mechanism (132), and the other end Is connected between the first cooling heat exchanger (131) and the second expansion mechanism (142), and a first bypass pipe (133) having a flow rate adjusting mechanism (SV-6, 137) is provided. It is what.
  • the refrigeration apparatus is provided with the refrigerant circuit (20) for performing the vapor compression refrigeration cycle by circulating the refrigerant.
  • the refrigerant circuit (20) is connected in series with first and second cooling heat exchangers (131, 141) that individually cool different interiors.
  • the refrigerant circuit (20) is provided with first and second expansion mechanisms (132, 142) corresponding to the cooling heat exchangers (131, 141).
  • the flow control mechanism (SV_6, 137) of the first bypass pipe (133) is fully closed, while the first expansion mechanism (132) is opened in a predetermined manner. Since the refrigerant is compressed by the compressor (41, 151), for example, the refrigerant condensed by the outdoor heat exchanger can flow into the first expansion mechanism (132). At this time, the refrigerant pressure is adjusted to a predetermined pressure according to the opening degree of the first expansion mechanism (132). The refrigerant decompressed by the first expansion mechanism (132) flows through the first cooling heat exchanger (131). In the first cooling heat exchanger (131), the refrigerant absorbs heat from the internal air and evaporates.
  • the interior is cooled to a predetermined temperature by the first cooling heat exchanger (131).
  • the refrigerant that has flowed out of the first cooling heat exchanger (131) passes through the second expansion mechanism (142).
  • the refrigerant pressure is adjusted to a predetermined pressure according to the opening degree of the second expansion mechanism (142).
  • the refrigerant decompressed by the second expansion mechanism (142) flows through the second cooling heat exchanger (141).
  • the refrigerant absorbs heat from the internal air and further evaporates. For this reason, the interior is cooled to a predetermined temperature by the second cooling heat exchanger (141).
  • the refrigerant is not introduced into the first bypass pipe (133).
  • the refrigerant can be circulated through the first and second cooling heat exchangers (131, 141).
  • the cooling capacity of the first cooling heat exchanger (131) is adjusted by the first expansion mechanism (132), and at the same time, the cooling capacity of the second cooling heat exchanger (141) is adjusted by the second expansion mechanism (142). can do.
  • the flow adjustment mechanism (SV-6, 137) of the first bypass pipe (133) is installed. While opening, the first expansion mechanism (132) is fully closed, so that the condensed refrigerant can be introduced into the first bypass pipe (133). Therefore, the refrigerant does not flow through the first expansion mechanism (132) and the first cooling heat exchanger (131) but passes through the second expansion mechanism (142). At this time, the refrigerant pressure is adjusted to a predetermined pressure in accordance with the opening degree of the second expansion mechanism (142). The refrigerant depressurized by the second expansion mechanism (142) flows through the second cooling heat exchanger (141). In the second cooling heat exchanger (141), the refrigerant absorbs heat from the internal air and evaporates. For this reason, the interior is cooled to a predetermined temperature by the second cooling heat exchanger (141).
  • the second cooling heat exchange is performed by introducing the refrigerant into the first bypass pipe (133). Force to distribute the refrigerant only to the vessel (141). At this time, the cooling capacity of the second cooling heat exchanger (141) can be adjusted by the second expansion mechanism (142).
  • a second invention is the refrigeration apparatus of the first invention, wherein the first bypass pipe (133) is formed so as to be in contact with the heat transfer pipe of the first cooling heat exchanger (131). (133a).
  • the first cooling heat exchanger (131) sufficiently cools the inside of the cabinet, and when performing the bypass operation for introducing the refrigerant into the first bypass pipe (133), the first bypass
  • the heat of the refrigerant flowing through the pipe (133) is conducted to the first cooling heat exchanger (131) through the heat transfer section (133a).
  • heat is exchanged between the relatively low temperature state, the internal air and the refrigerant flowing through the first bypass pipe (133) via the first cooling heat exchanger (131) and the heat transfer section (133a).
  • the refrigerant flowing through the first bypass pipe (133) is cooled.
  • the refrigerant that is sent to the second cooling heat exchanger (141) is supercooled by the first bypass pipe (1 It can be carried out in the heat transfer section (133a) of 33).
  • the third invention has first and second cooling heat exchangers (131, 141), a compressor (41, 151), and an expansion mechanism (132, 142) for cooling different interiors, respectively. It is assumed that the refrigerant circuit (20) is provided and the refrigerant circuit (20) includes the first and second cooling heat exchangers (131, 141) connected in series. In this refrigeration apparatus, the expansion mechanism (132, 142) adjusts the refrigerant pressure flowing into the first cooling heat exchanger (131) and the second expansion heat exchange. And a second expansion mechanism (142) for adjusting the refrigerant pressure flowing into the vessel (141).
  • One end of the refrigerant circuit (20) is connected to the inflow end of the first expansion mechanism (132), and the other end Is connected between the first expansion mechanism (132) and the first cooling heat exchanger (131), and a first bypass pipe (133) having a flow rate adjusting mechanism (SV-6, 137) is provided.
  • the first bypass pipe (133) is provided in the refrigerant circuit (20) with a configuration different from that of the first invention.
  • the first bypass pipe (133) constitutes a bypass path to the inflow end force of the first expansion mechanism (132) to the outflow end of the first cooling heat exchanger (131).
  • the first bypass pipe (133) of the third invention constitutes a bypass path to the inflow end force of the first expansion mechanism (132) to the outflow end of the first expansion mechanism (132).
  • the technical feature of bypassing the first expansion mechanism (132) is the same for the bypass pipe (133) of any invention.
  • the flow control mechanism (SV_6, 137) of the first bypass pipe (133) is fully closed, while the first expansion mechanism (132) is opened in a predetermined manner. By opening each time, it is possible to force the condensed refrigerant to flow into the first expansion mechanism (132). Accordingly, in the same manner as in the first invention, the refrigerant is circulated through the first and second cooling heat exchangers (131, 141), and the cooling capacity of both cooling heat exchangers (131, 141) is changed to each cooling heat exchange. It can be adjusted by the expansion mechanism (132, 142) corresponding to the vessel (131, 141).
  • the flow rate adjustment mechanism (SV_6, 137) of the first bypass pipe (133) is opened.
  • the condensed refrigerant can be introduced into the first bypass pipe (133). For this reason, the refrigerant does not flow through the first expansion mechanism (132), but is decompressed.
  • the first cooling heat exchanger (131) is circulated in the absence. Therefore, in the first cooling heat exchanger (131), the refrigerant does not evaporate and is cooled by exchanging heat with the air in the cabinet at a relatively low temperature.
  • the refrigerant can be supercooled in the first cooling heat exchanger (131).
  • the refrigerant that has flowed out of the first cooling heat exchanger (131) passes through the second expansion mechanism (142).
  • the refrigerant pressure is adjusted to a predetermined pressure in accordance with the opening degree of the second expansion mechanism (142).
  • the refrigerant depressurized by the second expansion mechanism (142) flows through the second cooling heat exchanger (141).
  • the refrigerant absorbs heat from the internal air and evaporates. For this reason, the inside of the cabinet is cooled to a predetermined temperature by the second cooling heat exchanger (141).
  • the refrigerant is introduced into the first bypass pipe (133), so that the first cooling heat exchanger (131)
  • the refrigerant circulating through the refrigerant can be sent to the second cooling heat exchanger (141) without evaporating. Therefore, the inside of the warehouse can be cooled only by the second cooling heat exchanger (141), and the cooling capacity of the second cooling heat exchanger (141) can be adjusted by the second expansion mechanism (142). .
  • the first cooling heat exchanger (131) since the refrigerant is supercooled, it is possible to improve the cooling capacity of the second cooling heat exchanger (141).
  • a fourth aspect of the invention is the refrigeration apparatus according to the first to third aspect 1, wherein one end of the refrigerant circuit (20) is connected to the inflow end of the second expansion mechanism (142), The other end is connected to the outflow end of the second cooling heat exchanger (141), and a second bypass pipe (143) having a flow rate adjusting mechanism (SV_6, 137) is provided.
  • the second bypass pipe (143) similar to the first nopass pipe (133) described above is provided as the bypass path of the second cooling heat exchanger (141). Therefore, when cooling of the second cooling heat exchanger (141) is not required, the refrigerant is circulated only to the first cooling heat exchanger (131), and the cooling capacity of the first cooling heat exchanger (131) is expanded to the first degree. It can be adjusted with the mechanism (132).
  • a fifth invention is the refrigeration apparatus according to any one of the first to fourth inventions, wherein the flow rate control mechanism is configured by an openable / closable solenoid valve (SV-6). is there.
  • SV-6 openable / closable solenoid valve
  • the solenoid valve (SV-6) is provided as a flow rate adjusting mechanism for the first bypass pipe (133) or the second bypass pipe (143). Therefore, the solenoid valve (SV-6) Thus, switching of the bypass operation in the bypass pipes (133, 143) can be easily performed.
  • a sixth invention is the refrigeration apparatus according to any one of the first to fourth inventions, wherein the flow rate control mechanism is constituted by an electrically operated valve (137) having a variable opening.
  • the motor operated valve (137) is provided as a flow rate adjusting mechanism for the first bypass pipe (133) or the second bypass pipe (143). Therefore, by switching the motor-operated valve (137) between the fully closed state and the fully opened state, it is possible to switch the bypass operation in the bypass pipe (133, 143).
  • the opening degree of the motor-operated valve (137) to a predetermined opening degree, the refrigerant flow rate bypassed to the bypass pipe (133, 143) and the cooling heat exchanger (bypassing the bypass pipe (133, 143) without being bypassed) 131, 141) and the distribution ratio with the refrigerant flow rate to be circulated can be adjusted. Therefore, it is possible to adjust the cooling capacity of the cooling heat exchanger (131, 141) by adjusting the flow rate of the refrigerant flowing through each cooling heat exchanger (131, 141).
  • a seventh invention is a refrigeration apparatus according to the first to sixth inventions, comprising a compressor (41, 151), a main compressor (41), and a sub compressor (151), and a refrigerant circuit.
  • (20) is a refrigeration circuit (110) having a refrigeration heat exchanger (111) that cools the inside of the refrigerator, and the first and second cooling heat exchangers that respectively cool the different freezers.
  • a refrigeration heat exchanger (131, 141) and a refrigeration circuit (30) having the auxiliary compressor (151) are connected in parallel to a heat source side circuit (40) having the main compressor (41). It is configured.
  • the refrigeration circuit (110) on the higher stage side and the refrigeration circuit (30) on the lower stage side are connected in parallel to the heat source side circuit (40), so-called two-stage.
  • a compression type refrigerant circuit (20) is formed.
  • the first and second cooling heat exchangers (first and second refrigeration heat exchangers) (131, 141) are connected in series to the refrigeration circuit (30) on the lower stage side.
  • the inside of the freezer is cooled by the first and second refrigeration heat exchangers (13 1,141). Therefore, by switching the bypass operation of the bypass pipes (133, 143), the inside of the freezer can be cooled with only one freezing heat exchanger.
  • the cooling capacity of each refrigeration heat exchanger (131, 141) can be adjusted by the expansion mechanism (132, 142) corresponding to the refrigeration heat exchanger (131, 141).
  • the interior is cooled by the first and second cooling heat exchangers (131, 141).
  • the refrigerant can be circulated through both the first cooling heat exchanger (131) and the second cooling heat exchanger (141) without passing through the first bypass pipe (133).
  • the refrigerant passes through the first expansion mechanism (132) before flowing into the first cooling heat exchanger (131). Therefore, the cooling capacity of the first cooling heat exchanger (131) can be adjusted by adjusting the opening of the first expansion mechanism (132) to a predetermined opening.
  • the refrigerant passes through the second expansion mechanism (142) before flowing into the second cooling heat exchanger (141). Therefore, the cooling capacity of the second cooling heat exchanger (141) can be adjusted by adjusting the opening degree of the second expansion mechanism (142).
  • the refrigerant can be circulated only to the second cooling heat exchanger (141) through the first bypass pipe (133). Therefore, it is possible to avoid unnecessary cooling from being performed in the first cooling heat exchanger (131).
  • cooling of the interior by the first cooling heat exchanger (131) is stopped by the bypass operation of the first bypass pipe (133), while the second cooling heat exchanger (141) Because only the interior can be cooled, it is possible to efficiently cool multiple interiors.
  • the second expansion mechanism (142 ) can be adjusted by adjusting the opening of the second expansion mechanism (142).
  • the heat transfer section (133a) of the first bypass pipe (133) is brought into contact with the heat transfer pipe of the first cooling heat exchanger (131). Therefore, when the refrigerant is introduced into the first bypass pipe (133), the heat of the refrigerant flowing through the first bypass pipe (133) is transferred to the first cooling heat exchanger (13 The refrigerant can be supercooled by conducting to 1). Therefore, the second cooling heat exchanger
  • the first refrigeration heat exchanger (1 31) can also be defrosted.
  • the refrigerant is not passed through the first bypass pipe (133) during the normal operation in which the interior is cooled by the first and second cooling heat exchangers (131, 141). Can be passed through both cooling heat exchangers (131, 141).
  • the refrigeration capacity of the first and second cooling heat exchangers (131, 141) can be adjusted by the expansion mechanism (132, 142) corresponding to each cooling heat exchanger (131, 141).
  • the refrigerant when the interior cooling by the first cooling heat exchanger (131) is unnecessary, the refrigerant is introduced into the first bypass pipe (133), whereby the first expansion mechanism
  • the first refrigeration heat exchanger (131) can be circulated without being depressurized at (132). Therefore, the first refrigeration heat exchanger (131) does not cool the inside of the warehouse, and only the second cooling heat exchanger (141) can cool the inside of the warehouse. Therefore, it is possible to avoid unnecessary cooling from being performed in the first cooling heat exchanger (131).
  • the second expansion mechanism before the refrigerant flows into the second cooling heat exchanger (141), the second expansion mechanism
  • the cooling capacity of the second cooling heat exchanger (141) can be adjusted by adjusting the opening of the second expansion mechanism (142).
  • the refrigerant introduced into the first bypass pipe (133) is supplied to the first refrigeration heat exchanger (131) when the first cooling heat exchanger (131) does not need to cool the inside of the warehouse.
  • the refrigerant can be supercooled in the first refrigeration heat exchanger (131). Therefore, the cooling capacity of the second cooling heat exchanger (141) can be improved.
  • the first cooling heat exchanger (131) and the second cooling heat exchanger (141) are connected in series.
  • the refrigeration capacity of the second cooling heat exchanger (141) tends to be insufficient. 2
  • the lack of refrigeration capacity of the cooling heat exchanger (141) can be resolved quickly.
  • the first refrigeration heat exchanger (131) Defrosting can be performed effectively.
  • the second bypass pipe (143) is provided as a bypass path of the second cooling heat exchanger (141). Therefore, for example, when the second cooling heat exchanger (141) is thermo-off, the refrigerant is circulated only to the first cooling heat exchanger (131) when the second cooling heat exchanger (141) does not need to cool the inside of the cabinet.
  • the inside of the cabinet can be cooled only by the first cooling heat exchanger (131). At this time, the cooling capacity of the first cooling heat exchanger (131) can be adjusted by the first expansion mechanism (132).
  • the solenoid valve (SV-6) is used as the flow rate adjusting mechanism of the bypass pipes (133, 143). Therefore, the bypass operation in the bypass pipes (133, 143) can be switched with a simple structure.
  • the motor-operated valve (137) is used as the flow rate adjusting mechanism of the bypass pipes (133, 143). Therefore, by adjusting the opening degree of the motor-operated valve (137) to a predetermined opening degree, the refrigerant flow rate bypassed to the bypass pipe (133,143) and the cooling heat exchanger (131,141) are bypassed to the bypass pipe (133,143). It is possible to adjust the distribution ratio with the refrigerant flow rate. Therefore, the cooling capacity of the first cooling heat exchanger (131) and the second cooling heat exchanger (141) can be adjusted by adjusting the opening degree of the electric valve (137).
  • the first and second cooling heat exchangers are connected to the refrigeration circuit (30) on the lower stage side.
  • the second refrigeration heat exchanger (131, 141) is provided in series, and the first to sixth inventions are applied. Therefore, in this refrigeration apparatus, the inside of the freezer can be cooled only by the necessary refrigeration heat exchanger (131, 141), and the cooling capacity of each refrigeration heat exchanger (131, 141) can be individually adjusted.
  • FIG. 1 is a schematic configuration diagram of a refrigeration apparatus according to an embodiment.
  • FIG. 2 is a schematic configuration diagram of a refrigeration apparatus showing a flow of refrigerant during a cooling operation.
  • FIG. 3 is a schematic configuration diagram of a refrigeration apparatus showing a refrigerant flow during the first heating operation.
  • FIG. 4 is a schematic configuration diagram of a refrigeration apparatus showing a refrigerant flow during the second heating operation.
  • FIG. 5 is a schematic configuration diagram of a refrigeration apparatus showing a refrigerant flow during the third heating operation.
  • FIG. 6 is a schematic configuration diagram of a refrigeration apparatus showing a refrigerant flow during a bypass operation.
  • FIG. 7 is a schematic configuration diagram of a refrigeration apparatus according to Modification 1.
  • FIG. 8 is a schematic configuration diagram of a refrigeration apparatus according to Modification 2.
  • FIG. 9 is a schematic configuration diagram of a refrigeration apparatus according to Modification 3.
  • FIG. 10 is a schematic configuration diagram of a refrigeration apparatus showing a refrigerant flow during a bypass operation of Modification 3.
  • FIG. 11 is a schematic configuration diagram of a refrigeration apparatus according to another embodiment.
  • FIG. 12 is a schematic configuration diagram of a refrigeration apparatus according to a conventional technique.
  • the refrigeration apparatus (10) of the present embodiment is installed in a convenience store or the like, and performs air conditioning in the store and cooling in the showcase.
  • the refrigeration apparatus (10) of the present embodiment includes an outdoor unit (11), an air conditioning unit (12), a refrigerated showcase (13) as a refrigerator, and a freezer First and second refrigeration showcases (15a, 15b) and a booster unit (16) are provided.
  • the outdoor unit (11) is installed outdoors.
  • the remaining air conditioning units (12) and the like are all installed in a store such as a convenience store.
  • the outdoor unit (11) has an outdoor circuit (40) force.
  • the air conditioning unit (12) has an air conditioning circuit (100), and the refrigerated showcase (13) has a refrigerator internal circuit (110) force.
  • (15a) is provided with the first freezer circuit (130a)
  • the second freezer showcase (15b) is provided with the second freezer circuit (13 Ob)
  • the booster unit (16) is provided with the booster circuit (150). It has been.
  • the refrigerant circuit (20) is configured by connecting these circuits (40, 100,...) With pipes.
  • the first freezer circuit (130a) and the second freezer circuit (130b) are connected in series with each other, and the second freezer circuit (130b) and the booster circuit (150) are connected in series with each other. It is connected to the.
  • the first freezer circuit (130a), the second freezer circuit (130b), and the booster circuit (150) constitute the freezer circuit (30).
  • a liquid side closing valve (31) is provided at the end of the first freezer circuit (130a), and a gas side closing valve (32) is provided at the end of the booster circuit (150).
  • the refrigerator internal circuit (110) alone constitutes a refrigeration circuit.
  • the outdoor circuit (40) alone constitutes a heat source side circuit.
  • the refrigerator internal circuit (110) and the refrigeration circuit (30) are connected to the outdoor circuit (40). Are connected in parallel. Specifically, the refrigerator internal circuit (110) and the refrigeration circuit (30) are connected to the outdoor circuit (40) via the first liquid side communication pipe (21) and the first gas side communication pipe (22). ing. One end of the first liquid side connecting pipe (21) is connected to the outdoor circuit (40). The other end of the first liquid side connecting pipe (21) is branched into two, one of which is connected to the liquid side end of the refrigerator internal circuit (110) and the other is connected to the liquid side shut-off valve (31). It is connected. One end of the first gas side connecting pipe (22) is connected to the outdoor circuit (40). The other end of the first gas side connection pipe (22) is branched into two, one of which is connected to the gas side end of the refrigerator internal circuit (110) and the other is connected to the gas side shut-off valve (32). It is connected.
  • the air conditioning circuit (100) is connected to the outdoor circuit (40) via the second liquid side communication pipe (23) and the second gas side communication pipe (24). ing.
  • One end of the second liquid side connecting pipe (23) is connected to the outdoor circuit (40), and the other end is connected to the liquid side end of the air conditioning circuit (100).
  • the second gas side connecting pipe (24) has one end connected to the outdoor circuit (40) and the other end connected to the gas side end of the air conditioning circuit (100).
  • the outdoor unit (11) includes the outdoor circuit (40). This outdoor circuit (4
  • variable capacity compressor (41) is provided with a variable capacity compressor (41), a fixed capacity compressor (42), an outdoor heat exchanger (43), a resin-o 44), and an outdoor expansion valve (45).
  • the outdoor circuit (40) is provided with two four-way switching valves (51, 52), two liquid side closing valves (53, 55), and two gas side closing valves (54, 56). .
  • the first liquid side shut-off valve (53) is connected to the first liquid side connecting pipe (2
  • variable capacity compressor (41) and the fixed capacity compressor (42) are all hermetic and high pressure dome type scroll compressors. Electric power is supplied to the variable capacity compressor (41) via an inverter.
  • the capacity of the variable capacity compressor (41) can be changed by changing the rotation speed of the compressor motor by changing the output frequency of the inverter.
  • the variable capacity compressor (41) constitutes a main compressor.
  • the compressor motor is always operated at a constant rotational speed, and its capacity is changed. It is impossible.
  • One end of the first suction pipe (61) is connected to the suction side of the variable capacity compressor (41).
  • the other end of the first suction pipe (61) is connected to the first gas side closing valve (54).
  • one end of the second suction pipe (62) is connected to the suction side of the fixed capacity compressor (42).
  • the other end of the second suction pipe (62) is connected to the second four-way switching valve (52).
  • One end of the suction connection pipe (63) is connected to the first suction pipe (61), and the other end of the suction connection pipe (63) is connected to the second suction pipe (62).
  • the suction connection pipe (63) is provided with a check valve (CV-1) that allows only the refrigerant to flow from one end to the other end.
  • a discharge pipe (64) is connected to the variable capacity compressor (41) and the fixed capacity compressor (42).
  • One end of the discharge pipe (64) is connected to the first four-way selector valve (51).
  • the discharge pipe (64) is branched at the other end into a first branch discharge pipe (64a) and a second branch discharge pipe (64b).
  • the first branch discharge pipe (64a) is connected to the discharge side of the variable capacity compressor (41), and the second branch discharge pipe (64b) is connected to the discharge side of the fixed capacity compressor (42).
  • the second branch discharge pipe (64b) is provided with a check valve (CV-3) that allows only the flow of refrigerant from the fixed capacity compressor (42) to the first four-way selector valve (51). It has been.
  • one end of a discharge connection pipe (65) is connected to the discharge pipe (64).
  • the other end of the discharge connection pipe (65) is connected to the second four-way selector valve (52).
  • the outdoor heat exchanger (43) is a cross-fin type fin-and-tube heat exchanger, and constitutes a heat source side heat exchanger.
  • heat is exchanged between the refrigerant and the outdoor air.
  • One end of the outdoor heat exchanger (43) is connected to the first four-way switching valve (51) via the closing valve (57).
  • the other end of the outdoor heat exchanger (43) is connected to the top of the receiver (44) via the first liquid pipe (81).
  • the first liquid pipe (81) is provided with a check valve (CV-4) that allows only refrigerant to flow from the outdoor heat exchanger (43) to the receiver (44).
  • One end of a second liquid pipe (82) is connected to the bottom of the receiver (44) via a closing valve (58).
  • the second liquid pipe (82) is branched into a first branch pipe (82a) and a second branch pipe (82b) on the other end side.
  • the first branch pipe (82a) of the second liquid pipe (82) is connected to the first liquid side shut-off valve (53), and the second branch pipe (82b) is connected to the second liquid side shut-off valve (55). It is connected to the.
  • the second branch pipe (82b) is provided with a check valve (CV-5) that allows only the refrigerant to flow from the receiver (44) to the second liquid side stop valve (55).
  • the second branch pipe (82b) of the second liquid pipe (82) of the second liquid pipe (82) there is a third pipe between the check valve (CV-5) and the second liquid side stop valve (55).
  • One end of the liquid pipe (83) is connected.
  • the other end of the third liquid pipe (83) is connected to the top of the receiver (44).
  • the third liquid pipe (83) is provided with a check valve (CV-6) that allows only the flow of the refrigerant from one end to the other end.
  • One end of the fourth liquid pipe (84) is connected downstream of the closing valve (58) in the second liquid pipe (82).
  • the other end of the fourth liquid pipe (84) is connected between the outdoor heat exchanger (43) and the check valve (C V-4) in the first liquid pipe (81).
  • the fourth liquid pipe (84) is provided with an outdoor expansion valve (45).
  • the first four-way switching valve (51) has a first port for the discharge pipe (64), a second port for the second four-way switching valve (52), and a third port for outdoor heat exchange.
  • the fourth port is connected to the second gas side shut-off valve (56) in the vessel (43).
  • This first four-way selector valve (51) is in the first state (the state indicated by the solid line in FIG. 1) in which the first port and the third port communicate with each other and the second port and the fourth port communicate with each other. ) And a second state (state indicated by a broken line in FIG. 1) in which the first port and the fourth port communicate with each other and the second port and the third port communicate with each other.
  • the second four-way switching valve (52) has a first port to the discharge connection pipe (65), a second port to the second suction pipe (62), and a fourth port to the first four-way valve. Each is connected to the second port of the switching valve (51).
  • the second four-way switching valve (52) has a third port sealed. Therefore, the second four-way switching valve is practically used as a three-way valve.
  • the second four-way selector valve (52) is in a first state (shown by a solid line in FIG. 1) in which the first port and the third port communicate with each other and the second port and the fourth port communicate with each other. State) and the second state (state indicated by a broken line in FIG. 1) in which the first port and the fourth port communicate with each other and the second port and the third port communicate with each other. .
  • the outdoor circuit (40) is also provided with an oil separator (70), an oil return pipe (71), an injection pipe (85), and a communication pipe (87). Furthermore, the outdoor circuit (40) is provided with two oil leveling pipes (72, 73) and two suction side pipes (66, 67). [0073]
  • the oil separator (70) is provided in the discharge pipe (64). The oil separator (70) is for separating refrigeration oil from the discharge gas of the compressor (41, 42). One end of an oil return pipe (71) is connected to the oil separator (70). The other end of the oil return pipe (71) is connected to the first suction pipe (61).
  • the oil return pipe (71) is provided with a solenoid valve (SV-5). When the solenoid valve (SV-5) is opened, the refrigeration oil separated by the oil separator (70) is sent back to the suction side of the variable capacity compressor (41).
  • the first oil equalizing pipe (72) has one end connected to the variable capacity compressor (41) and the other end connected to the second suction pipe (62).
  • the first oil leveling pipe (72) is provided with a solenoid valve (SV-1).
  • the second oil equalizing pipe (73) has one end connected to the fixed capacity compressor (42) and the other end connected to the first suction pipe (61).
  • the second oil equalizing pipe (73) is provided with a solenoid valve (SV-2).
  • the first suction side pipe (66) has one end connected to the second suction pipe (62) and the other end connected to the first suction pipe (61).
  • the first suction pipe (66) is provided with a solenoid valve (SV-3) and a check valve (CV-2) in that order from one end to the other end.
  • This check valve (CV-2) allows only the flow of the refrigerant directed toward the other end of the first suction side pipe (66).
  • the second suction side pipe (67) is connected so as to connect both sides of the solenoid valve (SV-3) in the first suction side pipe (66).
  • the second suction pipe (67) is equipped with a solenoid valve (SV-4).
  • the injection pipe (85) is for performing so-called liquid injection.
  • One end of the injection pipe (85) is connected to the fourth liquid pipe (84) via the closing valve (59), and the other end is connected to the first suction pipe (61).
  • the injection pipe (85) is provided with a variable flow rate control valve (86).
  • One end of a communication pipe (87) is connected between the closing valve (59) and the flow control valve (86) in the indication pipe (85).
  • the other end of the communication pipe (87) is connected between the oil separator (70) and the solenoid valve (SV-5) in the oil return pipe (71).
  • the communication pipe (87) is provided with a check valve (CV-7) that allows only one-way force to flow to the other end.
  • the outdoor circuit (40) is also provided with various sensors and pressure switches. Specifically, the first 1 The suction pipe (61) is provided with the force of the first suction temperature sensor (91) and the first suction pressure sensor (93). The second suction pipe (62) is provided with a second suction temperature sensor (92) and a second suction pressure sensor (94). The discharge pipe (64) is provided with a discharge temperature sensor (96) and a discharge pressure sensor (97). One high pressure switch (95) is provided in each of the first and second discharge branch pipes (64a, 64b).
  • the outdoor unit (11) is provided with an outdoor temperature sensor (90) and an outdoor fan (48). Outdoor air is sent to the outdoor heat exchanger (43) by the outdoor fan (48).
  • the air conditioning unit (12) includes the air conditioning circuit (100).
  • an air conditioning expansion valve (102) and an air conditioning heat exchanger (101) are provided in that order from the liquid side end to the gas side end.
  • the air conditioning heat exchanger (101) is constituted by a cross fin type fin 'and' tube type heat exchanger.
  • heat is exchanged between the refrigerant and the room air.
  • the air conditioning expansion valve (102) is an electronic expansion valve.
  • the air conditioning unit (12) is provided with a heat exchanger temperature sensor (103) and a refrigerant temperature sensor (104).
  • the heat exchanger temperature sensor (103) is attached to the heat transfer tube of the air conditioning heat exchanger (101).
  • the refrigerant temperature sensor (104) is attached in the vicinity of the gas side end of the air conditioning circuit (100).
  • the air conditioning unit (12) is provided with an internal air temperature sensor (106) and an air conditioning fan (105). The indoor air in the store is sent to the air conditioning heat exchanger (101) by the air conditioning fan (105).
  • the refrigerated showcase (13) includes the refrigerator internal circuit (110).
  • a refrigeration expansion valve (112) and a refrigeration heat exchanger (111) are provided in this order from the liquid side end to the gas side end.
  • the refrigerated heat exchanger (111) is a cross-fin type fin-and-tube heat exchanger and constitutes a first heat exchanger.
  • the refrigeration expansion valve (112) is an electronic expansion valve.
  • the refrigerated showcase (13) includes a heat exchanger temperature sensor (113), a refrigerant temperature sensor (114), Is provided.
  • the heat exchanger temperature sensor (113) is attached to the heat transfer tube of the refrigeration heat exchanger (111).
  • the refrigerant temperature sensor (114) is attached in the vicinity of the gas side end in the refrigerator internal circuit (110).
  • the refrigerated showcase (13) is provided with a refrigerator temperature sensor (116) and a refrigerator fan (115). To the refrigeration heat exchanger (111), the air in the refrigerator showcase (13) is sent by the refrigerator fan (115).
  • the frozen showcase is composed of first and second frozen showcases (15a, 15b).
  • the first freezer showcase (15a) includes the first freezer circuit (130a), while the second freezer showcase (15b) includes the second freezer circuit (130b).
  • the first refrigeration heat exchanger (131) is a cross-fin type fin-and-tube heat exchanger, and constitutes a first cooling heat exchanger. In the first refrigeration heat exchanger (131), heat is exchanged between the refrigerant and the internal air.
  • the first refrigeration expansion valve (132) is an electronic expansion valve. The first refrigeration expansion valve (132) adjusts the refrigerant pressure flowing into the first refrigeration heat exchanger (131).
  • the first freezer showcase (15b) is provided with a first freezer temperature sensor (136) and a first freezer fan (135). The air in the first freezer showcase (15a) is sent to the first freezer heat exchanger (131) by the first freezer fan (135).
  • the second freezer circuit (130b) in order from the liquid side end to the gas side end, the second refrigeration expansion valve (second expansion mechanism) (142), the second refrigeration heat exchanger (141) ) And a refrigerant temperature sensor (144).
  • the second refrigeration heat exchanger (141) is a cross-fin type fin-and-tube heat exchanger, and constitutes a second cooling heat exchanger. In the second refrigeration heat exchanger (141), heat is exchanged between the refrigerant and the internal air.
  • the second refrigeration expansion valve (142) is an electronic expansion valve. The second refrigeration expansion valve (142) adjusts the refrigerant pressure flowing into the second refrigeration heat exchanger (141).
  • the second freezer showcase (15b) is provided with a second freezer temperature sensor (146) and a second freezer fan (145).
  • the second refrigeration heat exchanger (141) is connected to the second refrigeration system by the second freezer fan (145).
  • the air in the cabinet (15b) is sent.
  • the refrigerant immediately before flowing into the first freezing expansion valve (132) is bypassed to the downstream side of the first freezing heat exchanger (131).
  • a bypass pipe (133) is provided.
  • the first bypass pipe (133) has one end connected to the inflow end of the first refrigeration expansion valve (132) and the other end connected between the first refrigeration heat exchanger (131) and the second refrigeration expansion valve (142). Connected between.
  • the first bypass pipe (133) is provided with a solenoid valve (SV-6) that can be freely opened and closed as a flow rate adjusting mechanism.
  • the check valve (CV-8) allows only the refrigerant flow toward the other end of the first bypass pipe (133), the outflow end force of the first refrigeration heat exchanger (131).
  • the booster unit (16) includes the booster circuit (150).
  • the booster circuit (150) is provided with a booster compressor (151).
  • the booster compressor (151) is a hermetically sealed high-pressure dome type scroll compressor. Electric power is supplied to the booster compressor (151) via an inverter. The capacity of the booster compressor (151) can be changed by changing the rotation speed of the compressor motor by changing the output frequency of the inverter.
  • the booster compressor (151) constitutes an auxiliary compressor.
  • the booster compressor (151) has a suction pipe (154) connected to the suction side and one end of the discharge pipe (155) connected to the discharge side.
  • the other end of the suction pipe (154) is connected to the gas side end of the second freezer circuit (13 Ob).
  • the other end of the discharge pipe (155) is connected to the gas-side stop valve (32).
  • the discharge pipe (155) is provided with a discharge temperature sensor (152) and a high pressure switch (153).
  • the refrigeration apparatus (10) of this embodiment includes a controller (200).
  • This controller (200) performs control operations of each four-way switching valve, each solenoid valve, and the like according to operating conditions.
  • the internal air is cooled in the refrigerated showcase (13), the first refrigerated showcase (15a), and the second refrigerated showcase (15b), and the indoor air is cooled in the air conditioning unit (12). This is an operation to cool the inside of the store.
  • the first four-way switching valve (51) and the second four-way switching valve (52) are set to the first state, and the outdoor expansion valve (45) Is fully closed. Further, the opening degrees of the air conditioning expansion valve (102) and the refrigeration expansion valve (112) are adjusted as appropriate. Furthermore, in the freezer internal circuit (130a, 130b), the solenoid valve (SV-6) is closed, and at the same time, the opening degree of the first freezing expansion valve (132) and the second freezing expansion valve (142) is increased. Adjust as appropriate. In this state, the variable capacity compressor (41), the fixed capacity compressor (42), and the booster compressor (151) are operated.
  • the refrigerant discharged from the variable capacity compressor (41) and the fixed capacity compressor (42) passes from the discharge pipe (64) through the first four-way switching valve (51) to the outdoor heat exchanger (43 ).
  • the refrigerant dissipates heat to the outdoor air and condenses.
  • the refrigerant condensed in the outdoor heat exchanger (43) passes through the receiver (44), flows into the second liquid pipe (82), and is distributed to each branch pipe (82a, 82b) of the second liquid pipe (82). Is done.
  • the refrigerant that has flowed into the first branch pipe (82a) of the second liquid pipe (82) passes through the first liquid side connecting pipe (21) and is connected to the refrigerator internal circuit (110) and the first freezer internal circuit (130a). And distributed.
  • the refrigerant flowing into the refrigerator internal circuit (110) is reduced in pressure when passing through the refrigeration expansion valve (112) and then introduced into the refrigeration heat exchanger (111).
  • the refrigerant absorbs heat from the internal air and evaporates.
  • the refrigerant evaporated in the refrigeration heat exchanger (111) flows into the first gas side connection pipe (22).
  • the refrigerated showcase (13) the inside air cooled by the refrigerated heat exchanger (111) is supplied to the inside.
  • the refrigerant flowing into the first freezer internal circuit (130a) is reduced to a predetermined pressure when passing through the first freezing expansion valve (132), and then introduced into the first freezing heat exchanger (131). .
  • the refrigerant absorbs heat from the internal air and evaporates.
  • the in-compartment air cooled by the first refrigeration heat exchanger (131) is supplied into the interior.
  • the refrigerant is reduced to a predetermined pressure when passing through the second refrigeration expansion valve (142), and then the second Introduced into the refrigeration heat exchanger (141).
  • the refrigerant absorbs air in the cabinet and evaporates.
  • the air inside the refrigerator cooled by the second refrigeration heat exchanger (141) is supplied into the refrigerator.
  • the variable capacity compressor (41) compresses the sucked refrigerant and discharges it to the first branch discharge pipe (64a) of the discharge pipe (64).
  • the refrigerant flowing into the second branch pipe (82b) of the second liquid pipe (82) is supplied to the air conditioning circuit (100) through the second liquid side connecting pipe (23).
  • the refrigerant flowing into the air conditioning circuit (100) is reduced in pressure when passing through the air conditioning expansion valve (102) and then introduced into the air conditioning heat exchanger (101).
  • the air conditioning heat exchanger (101) the refrigerant absorbs heat from the room air and evaporates.
  • the indoor air cooled by the air conditioning heat exchanger (101) is supplied into the store.
  • the refrigerant evaporated in the air conditioning heat exchanger (101) flows into the outdoor circuit (40) through the second gas side connecting pipe (24), and switches between the first four-way switching valve (51) and the second four-way switching. After passing through the valve (52) in order, it is sucked into the fixed capacity compressor (42) through the second suction pipe (62).
  • the fixed capacity compressor (42) compresses the sucked refrigerant and discharges it to the second branch discharge pipe (64b) of the discharge pipe (64).
  • the first four-way selector valve (51) is set to the second state, and the second four-way selector valve (52) is set to the first state.
  • the outdoor expansion valve (45) is fully closed.
  • the opening degree of the air conditioning expansion valve (102) and the refrigeration expansion valve (112) is appropriately adjusted.
  • the opening degree of the first refrigeration expansion valve (132) and the second refrigeration expansion valve (142) is adjusted as appropriate while the solenoid valve (SV-6) is closed.
  • the variable capacity compressor (41) and the booster compressor (151) are operated, and the fixed capacity compressor (42) is stopped. Further, the outdoor heat exchanger (43) enters a dormant state without the refrigerant being sent.
  • the refrigerant discharged from the variable capacity compressor (41) is introduced into the air-conditioning heat exchanger (101) of the air conditioning circuit (100) through the second gas side connecting pipe (24), and into the outdoor air. It dissipates heat and condenses.
  • the indoor air heated by the air conditioning heat exchanger (101) is supplied into the store.
  • the refrigerant condensed in the air conditioning heat exchanger (101) is sent back to the outdoor circuit (40) through the second liquid side communication pipe (23), passes through the receiver (44), and passes through the second liquid pipe (82). Flow into.
  • the refrigerant flowing into the second liquid pipe (82) is distributed to the refrigerator internal circuit (110) and the first freezer internal circuit (130a) through the first liquid side connecting pipe (21).
  • the internal air is cooled as in the cooling operation.
  • the refrigerant evaporated in the refrigeration heat exchanger (111) flows into the first suction pipe (61) through the first gas side communication pipe (22).
  • the refrigerant evaporated in the first refrigeration heat exchanger (131) and the second refrigeration heat exchanger (141) is compressed by the booster compressor (151) and then passes through the first gas side communication pipe (22). It flows into the first suction pipe (61).
  • the refrigerant flowing into the first suction pipe (61) is sucked into the variable capacity compressor (41) and compressed.
  • the refrigerant absorbs heat in the refrigeration heat exchanger (111) and the first and second refrigeration heat exchangers (131, 141), and the refrigerant in the air conditioning heat exchanger (101). Radiates heat. Then, the interior of the store is heated using the heat that the refrigerant also absorbed in the air in the refrigerator in the refrigerated heat exchanger (111) and the first and second refrigeration heat exchangers (131, 141).
  • the fixed capacity compressor (42) may be operated. Whether to operate the fixed capacity compressor (42) is determined according to the cooling load in the refrigerated showcase (13) and the first and second refrigerated showcases (15a, 15b). In this case, a part of the refrigerant flowing into the first suction pipe (61) is sucked into the fixed capacity compressor (42) through the suction connection pipe (63) and the second suction pipe (62).
  • the second heating operation is an operation for heating the inside of the store similarly to the first heating operation.
  • This first (2) The heating operation is performed when the heating capacity is excessive in the first heating operation.
  • the first four-way switching valve (51) and the second four-way switching valve (52) are set to the second state, and the outdoor expansion valve (45) Is fully opened. Further, the opening degrees of the air conditioning expansion valve (102) and the refrigeration expansion valve (112) are adjusted as appropriate. Furthermore, in the freezer internal circuit (130a, 130b), the solenoid valve (SV-6) is closed, and at the same time, the opening degree of the first freezing expansion valve (132) and the second freezing expansion valve (142) is increased. Adjust as appropriate. In this state, the variable capacity compressor (41) and the booster compressor (151) are operated, and the fixed capacity compressor (42) is stopped.
  • a part of the refrigerant discharged from the variable capacity compressor (41) passes through the second gas side connecting pipe (24) and is introduced into the air conditioning heat exchanger (101) of the air conditioning circuit (100). The remainder is introduced into the outdoor heat exchanger (43) through the discharge connection pipe (65).
  • the refrigerant introduced into the air conditioning heat exchanger (101) dissipates heat to the indoor air and condenses, and passes through the second liquid side connecting pipe (23) and the third liquid pipe (83) of the outdoor circuit (40).
  • the refrigerant introduced into the outdoor heat exchanger (43) dissipates heat to the outdoor air, condenses, and flows into the receiver (44) through the first liquid pipe (81).
  • the refrigerant that has flowed out of the receiver (44) into the second liquid pipe (82) passes through the first liquid side connecting pipe (21) and the first circuit (110) in the refrigerator in the same manner as in the first heating operation. It is distributed to the freezer circuit (130a).
  • the inside air is cooled.
  • the refrigerant evaporated in the refrigeration heat exchanger (111) flows into the first suction pipe (61) through the first gas side connection pipe (22).
  • the refrigerant evaporated in the first refrigeration heat exchanger (131) and the second refrigeration heat exchanger (141) is compressed by the booster compressor (151) and then passes through the first gas side communication pipe (22). Flow into the first suction pipe (61).
  • the refrigerant flowing into the first suction pipe (61) is sucked into the variable capacity compressor (41) and compressed.
  • the refrigerant absorbs heat in the refrigeration heat exchanger (111) and the first and second refrigeration heat exchangers (131, 141), and the air conditioning heat exchanger (101) and the outdoor
  • the refrigerant dissipates heat in the heat exchanger (43).
  • a part of the heat absorbed by the refrigerant from the air in the refrigerator in the refrigeration heat exchanger (111) and the first and second refrigeration heat exchangers (131, 141) is used for heating in the store, and the remainder remains. Released into outdoor air.
  • the fixed capacity compressor (42) may be operated. Whether or not the fixed capacity compressor (42) is operated depends on whether it is a refrigerated showcase (13) or first and second refrigerated showcases (15a). , 15b) according to the cooling load. In this case, a part of the refrigerant flowing into the first suction pipe (61) is sucked into the fixed capacity compressor (42) through the suction connection pipe (63) and the second suction pipe (62).
  • the third heating operation is an operation for heating the inside of the store similarly to the first heating operation. This third heating operation is performed when the heating capacity is insufficient in the first heating operation.
  • the first four-way selector valve (51) is set to the second state, and the second four-way selector valve (52) is set to the first state.
  • the openings of the outdoor expansion valve (45), the air conditioning expansion valve (102), and the refrigeration expansion valve (112) are adjusted as appropriate.
  • the solenoid valve (SV-6) is closed, and at the same time, the opening degree of the first refrigeration expansion valve (132) and the second refrigeration expansion valve (142) is appropriately set. Adjusted. In this state, the variable capacity compressor (41), the fixed capacity compressor (42), and the booster compressor (151) are operated.
  • the refrigerant discharged from the variable capacity compressor (41) and the fixed capacity compressor (42) passes through the second gas side connecting pipe (24) and is used in the air conditioning heat exchanger (101) of the air conditioning circuit (100). It is introduced into the room and dissipates heat to the outdoor air to condense.
  • the indoor air heated by the air conditioning heat exchanger (101) is supplied into the store.
  • the refrigerant condensed in the air conditioning heat exchanger (101) flows into the receiver (44) through the second liquid side connecting pipe (23) and the third liquid pipe (83). A part of the refrigerant flowing into the second liquid pipe (82) from the receiver (44) flows into the first liquid side connecting pipe (21), and the remainder flows into the fourth liquid pipe (84).
  • the refrigerant flowing into the first liquid side connecting pipe (21) is distributed to the refrigerator internal circuit (110) and the first freezer internal circuit (130a).
  • the interior air is cooled as in the first heating operation.
  • the refrigerant evaporated in the refrigeration heat exchanger (111) flows into the first suction pipe (61) through the first gas side communication pipe (22).
  • the refrigerant evaporated in the first refrigeration heat exchanger (131) and the second refrigeration heat exchanger (141) is compressed by the booster compressor (151) and then passed through the first gas side connecting pipe (22). It flows into the first suction pipe (61).
  • the refrigerant flowing into the first suction pipe (61) is sucked into the variable capacity compressor (41) and compressed.
  • the refrigerant flowing into the fourth liquid pipe (84) is reduced in pressure when passing through the outdoor expansion valve (45). After that, it is introduced into the outdoor heat exchanger (43) and absorbs heat from the outdoor air to evaporate.
  • the refrigerant evaporated in the outdoor heat exchanger (43) flows into the second suction pipe (62), is sucked into the fixed capacity compressor (42), and is compressed.
  • the refrigerant absorbs heat in the refrigeration heat exchanger (111), the refrigeration heat exchanger (131), and the outdoor heat exchanger (43), and the air conditioning heat exchanger (101 ), The refrigerant dissipates heat. Then, the heat that the refrigerant has absorbed from the indoor air in the refrigeration heat exchanger (111) and the refrigeration heat exchanger (131) and the heat that the refrigerant has absorbed from the outdoor air in the outdoor heat exchanger (43) are used. The inside of the store is heated.
  • the interior is cooled in both the first refrigeration showcase (15a) and the second refrigeration showcase (15b).
  • the inside temperature of the first refrigeration showcase (15a) is sufficiently cooled, useless cooling is performed in the first refrigeration heat exchanger (131).
  • the following bypass operation is performed.
  • the bypass operation during the cooling operation of the refrigeration apparatus (10) will be described as an example.
  • the solenoid valve (SV-6) of the first freezer internal circuit (130a) is opened.
  • the first refrigeration expansion valve (131) is fully closed.
  • the refrigerant distributed from the first liquid side connecting pipe (21) to the first freezer circuit (130a) is the first refrigeration expansion valve (1 32) and the first refrigeration heat exchanger.
  • the first bypass pipe (133) is distributed instead. Therefore, in the first refrigeration heat exchanger (131), heat exchange between the refrigerant and the internal air is not performed.
  • the refrigerant flowing through the first bypass pipe (133) is reduced to a predetermined pressure when passing through the second refrigeration expansion valve (134) and then introduced into the second refrigeration heat exchanger (142). .
  • the refrigerant absorbs heat from the internal air and evaporates.
  • the in-compartment air cooled by the second refrigeration heat exchanger (141) is supplied into the interior.
  • the refrigerant that has cooled only the second refrigeration showcase (15b) It flows into the passage (150) and is sucked into the booster compressor (151).
  • the refrigerant compressed by the booster compressor (151) flows into the first gas side connecting pipe (22) through the discharge pipe (155).
  • the refrigerant is circulated through both the first refrigeration heat exchanger (131) and the second refrigeration heat exchanger (141) without passing through the first bypass pipe (133) (see, for example, FIG. 1). .
  • the opening degree of the first expansion valve (131) is adjusted to a predetermined opening degree. By doing so, the cooling capacity of the first refrigeration heat exchanger (131) can be adjusted.
  • the opening degree of the second refrigeration expansion valve (142) is adjusted to adjust the second refrigeration expansion valve (142).
  • the cooling capacity of the refrigeration heat exchanger (141) can be adjusted.
  • the refrigerant immediately before flowing into the second freezing expansion valve (144) is supplied to the second freezing heat exchanger (141).
  • a second no-pass pipe (133) for bypassing is provided downstream.
  • the second bypass pipe (143) has one end connected to the inflow end of the second refrigeration expansion valve (142) and the other end connected to the outflow end of the second refrigeration heat exchanger (141).
  • the second bypass pipe (143) is provided with an openable / closable solenoid valve (SV-7) as a flow rate adjusting mechanism.
  • a check valve (CV-9) is provided between the second refrigeration heat exchanger (141) and the other end of the second bypass pipe (143). The check valve (CV-9) allows only refrigerant flow from the outflow end of the second refrigeration heat exchanger (141) to the other end of the second bypass pipe (143).
  • the first bypass pipe (133) of this modified example is located in the first refrigeration showcase (15a) and the first refrigeration heat exchanger (131). Shaped to contact heat transfer tube It has a heat transfer section (133a) formed.
  • the heat of the refrigerant flowing through the first bypass pipe (133) is conducted to the first refrigeration heat exchanger (131) via the heat transfer section (133a).
  • the internal air that is in a relatively low temperature state and the refrigerant flowing through the first bypass pipe (133) exchange heat through the first refrigeration heat exchanger (131) and the heat transfer section (133a).
  • the refrigerant flowing through the first bypass pipe (133) is cooled. Therefore, in the second modification, the refrigerant can be supercooled in the first freezer circuit (130a). Therefore, the refrigeration capacity of the second refrigeration heat exchanger (141) can be improved.
  • the first bypass pipe ( 133) when the moisture in the air adheres to the first refrigeration heat exchanger (131) and freezes to form frost, the first bypass pipe ( 133), the surface of the first refrigeration heat exchanger (131) can be heated with the refrigerant flowing through the so-called defrost.
  • Modification 3 of the above embodiment will be described. Modification 3 is different from the above embodiment and Modification 2 in the configuration of the first bypass pipe (133). Only differences from the above embodiment will be described below.
  • the first bypass pipe (133) of Modification 3 has one end connected to the inflow end of the first refrigeration expansion valve (132) and the other end connected to the first refrigeration expansion valve ( 132) and the first refrigeration heat exchanger (131).
  • the first bypass pipe (133) is provided with a solenoid valve (SV-6) that can be opened and closed in the same manner as in the above embodiment.
  • the solenoid valve (SV-6) is opened as shown in FIG.
  • the refrigeration expansion valve (131) is fully closed.
  • the refrigerant flowing into the first freezer circuit (130a) does not pass through the first freezing expansion valve (131) but passes through the first bypass pipe (133), and the first freezing heat exchanger (131).
  • the refrigerant flowing through the first refrigeration heat exchanger (131) is not depressurized, it does not evaporate by the internal air and releases heat to the internal air that is in a relatively low temperature state. Therefore, also in the third modification, the refrigerant flowing through the first refrigeration heat exchanger (131) can be supercooled.
  • the refrigeration capacity of the second refrigeration heat exchanger (141) can be improved.
  • the surface of the first refrigeration heat exchanger (131) is heated by flowing an undepressurized refrigerant through the first refrigeration heat exchanger (131) by a bypass operation, and so-called defrosting is performed. You can also.
  • the present invention may be configured as follows with respect to the above embodiment.
  • the openable / closable solenoid valves (SV-6, SV-7) are provided as the flow rate adjusting mechanism of the first bypass pipe (133) or the second bypass pipe (143).
  • a motor-operated valve (137) having a variable opening may be provided in place of such a solenoid valve (here, SV-6).
  • the motor operated valve (137) is used as the flow rate adjusting mechanism, the refrigerant can be circulated through the first refrigeration heat exchanger (131) and the first bypass pipe (133) at a predetermined distribution ratio. Therefore, the refrigeration capacity of the first refrigeration heat exchanger (131) and the second refrigeration heat exchanger (141) can be adjusted according to the opening degree of the electric valve (137).
  • the first and second refrigeration heat exchangers (131, 141) are provided in series with the refrigerant circuit (20).
  • the refrigerant circuit (20) includes three or more A refrigeration heat exchanger may be provided in series.
  • the refrigerant circuit (20) by providing the refrigerant circuit (20) with a plurality of expansion mechanisms and squeezing pipes corresponding to the respective refrigeration heat exchangers, it is possible to cool the interior with only the necessary refrigeration heat exchangers. At the same time, the cooling capacity of each refrigeration heat exchanger can be adjusted individually.
  • the present invention is useful for a refrigeration apparatus in which a plurality of heat exchangers for cooling the interior of a refrigerant circuit are provided in series.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)

Abstract

Circuit d’agent réfrigérant (20) où un premier et un second échangeurs de chaleur (131, 141) sont agencés de manière à refroidir individuellement les intérieurs de chambres et où un premier et un second mécanisme d’expansion (132, 142) sont assortis au premier et au second échangeurs de chaleur refroidissants (131, 141). Le circuit d’agent réfrigérant (20) comporte en outre un tuyau de dérivation (133) dont une extrémité est reliée à l’extrémité d’entrée du premier mécanisme d’expansion (132) et dont l’autre extrémité est reliée à une section entre le premier échangeur de chaleur refroidissant (131) et le second mécanisme d’expansion (142). En fonctionnement normal, un agent réfrigérant passe dans le premier et le second échangeurs de chaleur refroidissants (131, 141), la capacité de refroidissement de chaque échangeur de chaleur refroidissant (131, 141) étant régulée par le premier et le second mécanismes d’expansion (132, 142). Quand le refroidissement par le premier échangeur de chaleur refroidissant (131) n’est pas nécessaire, l’agent réfrigérant passe dans le second échangeur de chaleur refroidissant (141) par le tuyau de dérivation (133), et la capacité de refroidissement du second échangeur de chaleur refroidissant (141) est régulée par le second mécanisme d’expansion (142).
PCT/JP2005/016441 2004-09-07 2005-09-07 Appareil de congélation Ceased WO2006028147A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2004259752A JP3858918B2 (ja) 2004-09-07 2004-09-07 冷凍装置
JP2004-259752 2004-09-07

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WO2006028147A1 true WO2006028147A1 (fr) 2006-03-16

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101877986B1 (ko) * 2011-10-27 2018-07-12 엘지전자 주식회사 공기조화기

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007309536A (ja) * 2006-05-16 2007-11-29 Daikin Ind Ltd 冷凍装置
JP5028927B2 (ja) * 2006-09-22 2012-09-19 ダイキン工業株式会社 空気調和装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5295366A (en) * 1976-02-07 1977-08-10 Toshiba Corp Freez-refrigerator
JPS5952361U (ja) * 1982-09-30 1984-04-06 株式会社東芝 空気調和装置
JPS62268960A (ja) * 1986-05-15 1987-11-21 三菱重工業株式会社 ヒ−トポンプ装置
JP2002267284A (ja) * 2001-03-13 2002-09-18 Toshiba Corp 冷蔵庫
JP2003314909A (ja) * 2002-04-22 2003-11-06 Daikin Ind Ltd 冷凍装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5295366A (en) * 1976-02-07 1977-08-10 Toshiba Corp Freez-refrigerator
JPS5952361U (ja) * 1982-09-30 1984-04-06 株式会社東芝 空気調和装置
JPS62268960A (ja) * 1986-05-15 1987-11-21 三菱重工業株式会社 ヒ−トポンプ装置
JP2002267284A (ja) * 2001-03-13 2002-09-18 Toshiba Corp 冷蔵庫
JP2003314909A (ja) * 2002-04-22 2003-11-06 Daikin Ind Ltd 冷凍装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101877986B1 (ko) * 2011-10-27 2018-07-12 엘지전자 주식회사 공기조화기

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JP2006078014A (ja) 2006-03-23
JP3858918B2 (ja) 2006-12-20
TWI272366B (en) 2007-02-01
TW200622166A (en) 2006-07-01

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