JP2001280729A - Refrigeration equipment - Google Patents

Abstract

(57) [Problem] To provide indoor air conditioning (that is, cooling and heating) and refrigeration in one refrigerant circuit. SOLUTION: In a refrigerating apparatus provided with an evaporator 6 for refrigeration or freezing connected in parallel with a use side heat exchanger 5 for indoor air conditioning, a refrigerant decompressed by a decompression mechanism 4 during a heating operation is supplied to the refrigerating apparatus. The heat source side heat exchanger 3 is configured to supply the heat to the evaporator 6 and the heat source side heat exchanger 3 so that the heat source side heat exchanger 3 functions as a condenser and the use side heat exchanger 5 functions as an evaporator during the cooling operation. It is possible to perform indoor cooling and refrigerate products and the like by the evaporator 6, and in the heating operation, the heat source side heat exchanger 3 acts as an evaporator, while the use side heat exchanger 5 acts as a condenser. To heat the room, and to cool the goods by the evaporator 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigeration system having a use side heat exchanger for indoor air conditioning and an evaporator for refrigeration.

[0002]

2. Description of the Related Art For example, a convenience store or the like requires a refrigerating / freezing refrigerating device for refrigerating or freezing a product and an air conditioning refrigerating device for air-conditioning a room. , Each constituted by a separate refrigerant circuit.

[0003]

In the above configuration, two refrigerant circuits, that is, a refrigerant circuit for indoor air conditioning and a refrigerant circuit for refrigeration / refrigeration are required, and there is a problem that the configuration becomes complicated. .

[0004] The present invention has been made in view of the above points, and has as its object to enable indoor air conditioning (that is, cooling and heating) and refrigeration to be performed by a single refrigerant circuit.

[0005]

According to the first aspect of the present invention, as a means for solving the above-mentioned problems, a compressor 1, a four-way switching valve 2, and a condenser functioning during a cooling operation and acting as a condenser during a cooling operation. A heat source side heat exchanger 3 acting as an evaporator, a pressure reducing mechanism 4, a room side air conditioner use side heat exchanger 5 acting as an evaporator during a cooling operation and acting as a condenser during a heating operation; In a refrigerating apparatus including a refrigerating or freezing evaporator 6 connected in parallel with a heat exchanger 5, a refrigerant depressurized by the decompression mechanism 4 during a heating operation is supplied to the evaporator 6 and the heat source side heat. It is configured to be supplied to the exchanger 3.

[0006] With the above-described configuration, during the cooling operation, the heat source side heat exchanger 3 functions as a condenser, while the use side heat exchanger 5 functions as an evaporator to perform indoor cooling and evaporator 6. And the like, and the heat source side heat exchanger 3 acts as an evaporator during the heating operation, while the use side heat exchanger 5 acts as a condenser to perform indoor heating and evaporator 6. Refrigeration of goods. In addition, even if the evaporator 6 stops the thermostat, the heat source for the indoor heating is the heat source side heat exchanger 3
Can be secured.

[0007] As in the invention of claim 2, claim 1
In the refrigerating apparatus described above, when an on-off valve 16 that controls refrigerant flow is provided so that the refrigerant depressurized by the decompression mechanism 4 can be supplied only to the evaporator 6 during the heating operation, the refrigerant is opened and closed during the heating operation. When the valve 16 is closed,
Waste heat used as a refrigeration cold heat source in the evaporator 6 can be recovered as a heating heat source in the use side heat exchanger 5.

[0008] As in the invention of claim 3, claim 2
In the refrigerating apparatus described above, when the on-off valve 16 is opened when the operation of the evaporator 6 is stopped, when the evaporator 6 is stopped by the thermostat, the heat source for room heating is supplied to the heat source side heat exchanger 3. Can be secured.

As in the invention of claim 4, claim 1
In the refrigerating apparatus described above, a heat recovery heating operation is performed in which the evaporator 6 is operated and the refrigerant condensed and liquefied in the use side heat exchanger 5 is supplied to the evaporator 6 via the pressure reducing mechanism 4. When the high-pressure pressure exceeds a predetermined value during the operation, when the four-way switching valve 2 is switched to the cooling operation side, the indoor heating load in the use side heat exchanger 5 is reduced and the use side heat exchanger When the balance between the amount of heat at 5 and the amount of cooling required by the evaporator 6 cannot be balanced (in other words, when the high pressure exceeds a predetermined value), the four-way switching valve 2 is switched to the cooling operation side, and the heat source side The heat exchanger 3 acts as a condenser, and the amount of cold heat (in other words, cooling capacity) in the evaporator 6 can be secured.

[0010] As in the invention of claim 5, claim 1
In the refrigerating apparatus described above, when the high-pressure pressure becomes lower than a predetermined value during the cooling operation in which the evaporator 6 is operated, the four-way switching valve 2 is switched to the heating operation side and the use-side heat exchanger 5 is switched. If the refrigerant condensed and liquefied is switched to the heat recovery heating operation in which the refrigerant condensed and liquefied is supplied to the evaporator 6 via the pressure reducing mechanism 4, the high pressure pressure in the heat source side heat exchanger 3 during the cooling operation in the intermediate period or the like. Is lower than a predetermined value (in other words, when the outside air temperature is low), the heat supplied to the evaporator 6 through the pressure reducing mechanism 4 by the refrigerant condensed and liquefied in the use side heat exchanger 5 The mode is switched to the recovery heating operation, and the energy saving operation becomes possible.

[0011] As in the invention of claim 6, claim 1
In the refrigerating apparatus described above, a heat recovery heating operation is performed in which the evaporator 6 is operated and the refrigerant condensed and liquefied in the use side heat exchanger 5 is supplied to the evaporator 6 via the pressure reducing mechanism 4. When the low pressure is lower than a predetermined value, the heat source side heat exchanger 3 is operated as an evaporator, while when the low pressure is higher than a predetermined value, the heat source side heat exchanger 3 is not operated. When the low pressure becomes lower than the predetermined value during the heat recovery heating operation (in other words, when the load on the evaporator 6 is reduced), the heat source side heat exchanger 3 acts as an evaporator. Thus, a heating heat source in the use side heat exchanger 5 is secured. When the low pressure becomes higher than the predetermined value, the operation is returned to the heat recovery and heating operation.

As in the invention of claim 7, claim 1
In the refrigeration apparatus described above, when the evaporator 6 is operated and the operation of the use side heat exchanger 5 is stopped,
If the room temperature is equal to or lower than a predetermined value, the refrigerant condensed and liquefied in the use side heat exchanger 5 is passed through the pressure reducing mechanism 4 to the evaporator 6.
If the room temperature becomes equal to or lower than a predetermined value even when the use side heat exchanger 5 is stopped, the heat source side heat exchanger 3
Is forcibly switched to the heat recovery and heating operation that does not use the fuel cell, and energy saving operation is possible.

In the refrigeration apparatus according to any one of claims 1, 2 and 3, as in the invention of claim 8, when the compressor 1 is capable of controlling the capacity, the evaporator 6
Thus, when the waste heat used as the cold heat source for refrigeration is recovered as the heating heat source in the use-side heat exchanger 5, the capacity of the compressor 1 can be controlled, and power consumption can be saved.

[0014]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

This refrigerating apparatus includes a pair of compressors 1, 1 connected in parallel, a four-way switching valve 2, a heat source side heat exchanger 3 having an outdoor fan 11, and an expansion valve 4 acting as a pressure reducing mechanism.
And a heat pump type air conditioning refrigerant circuit A configured by sequentially connecting the use side heat exchangers 5 through a refrigerant pipe, and a branch from the downstream side of the expansion valve 4 in the heat pump type air conditioning refrigerant circuit A, and refrigeration. And a refrigeration circuit (in other words, a heat recovery circuit) B connected to the suction side of the compressors 1 and 1 via the evaporator 6.

Between the heat source side heat exchanger 3 and the expansion valve 4, a receiver 7 connected to the outlet side of the heat source side heat exchanger 3 during cooling operation, and a liquid of the receiver 7. Liquid refrigerant from the phase section is transferred to an external heat medium (for example, outdoor air)
The air-cooled first supercooling heat exchanger 8 which is supercooled by the pressure reducing part of the supercooling liquid refrigerant from the first supercooling heat exchanger 8 is reduced by the temperature-sensitive expansion valve 9. And a second triple cooling type supercooling heat exchanger 9 for further supercooling by the latent heat of vaporization of the gas-liquid mixed refrigerant obtained as described above. The second
The gas refrigerant evaporated and vaporized in the supercooling heat exchanger 9 of
It is to be supplied to the suction side of the compressors 1, 1 via the low-pressure gas pipe 12. The temperature-sensitive cylinder 10 a of the temperature-sensitive expansion valve 10 is attached to the low-pressure gas pipe 12. Reference numeral 13 denotes an electromagnetic on-off valve that is opened only when a part of the liquid refrigerant is supplied to the second subcooling heat exchanger 9.
In the present embodiment, the outdoor fan 11
Is shared by the use side heat exchanger 3 and the first subcooling heat exchanger 8.

On the inlet side of the receiver 7, a bridge circuit 14 having four check valves 14a to 14d is provided. During the cooling operation, the bridge circuit 14 guides the liquid refrigerant from the heat source side heat exchanger 3 to the receiver 7 and guides the liquid refrigerant from the receiver 7 to the use side heat exchanger 5 after passing through the expansion valve 4 to perform the heating operation. At times, it functions as a flow path switching mechanism that guides the liquid refrigerant from the use side heat exchanger 5 to the receiver 7 and guides the liquid refrigerant from the receiver 7 to the heat source side heat exchanger 3 after passing through the expansion valve 4. Reference numeral 15 denotes a check valve that permits the flow of the liquid refrigerant from the heat source side heat exchanger 3 to the receiver 7 only during the cooling operation, and 16 denotes an open valve that operates during the heating operation to connect the expansion valve 4 to the use side heat exchanger 3. The refrigerant is allowed to flow, and is closed during the heating heat recovery operation, and is closed from the expansion valve 4 to the refrigeration evaporator 6.
This is an electromagnetic on-off valve that allows refrigerant to flow only to the solenoid valve.

The upstream liquid pipe 17 of the refrigeration evaporator 6 in the refrigeration refrigerant circuit B has a refrigeration refrigerant circuit C to be described later.
A plate heat exchanger 19 for exchanging heat with the refrigerant gas discharged from the refrigerating compressor 18 is provided.

The refrigerating refrigerant circuit C includes the refrigerating compressor 18, the plate heat exchanger 19, the temperature-sensitive expansion valve 20,
The refrigeration evaporator 21 and the accumulator 22 are sequentially connected via a refrigerant pipe.

Between the utilization side heat exchanger 5 and the bridge circuit 14, a series circuit 23a of an electromagnetic on / off valve 24 and a check valve 25 for permitting refrigerant flow only during cooling operation, and an electromagnetic on / off valve 26 Reversible flow mechanism 2 including a series circuit 23b of a check valve 27 and a check valve 27 permitting refrigerant flow only during the heating operation.
3 are interposed. Reference numeral 28 denotes a liquid escape capillary tube that bypasses the electromagnetic on-off valve 26.

The refrigeration refrigerant circuit B is provided with a bypass circuit 29 for bypassing the refrigeration evaporator 6. The bypass circuit 29 has an electromagnetic opening / closing operation which is opened only when the operation of the refrigeration evaporator 6 is stopped. A valve 30 is provided. Reference numeral 31 denotes an electromagnetic on / off valve that is closed only when the operation of the refrigerating evaporator 6 is stopped, 32 denotes an electromagnetic on / off valve that is closed only when the operation of the refrigerating evaporator 21 is stopped, and 33 denotes a use side heat exchanger 5. The attached indoor fan, 34 is a refrigeration fan attached to the refrigeration evaporator 6, and 35 is a refrigeration fan attached to the refrigeration evaporator 21.

An oil separator 36 for separating the lubricating oil contained in the gas refrigerant is provided on the discharge side of the compressors 1 and 1. The lubricating oil separated by the oil separator 36 is an oil separator. The air is returned to the suction pipe 38 of the compressors 1 and 1 via the return pipe 37. Reference numeral 39 denotes an electromagnetic on-off valve that is opened when the oil is returned.

In the drawing, reference numeral 40 denotes a pressure sensor which functions as a high pressure detecting means for detecting a high pressure which is a discharge pressure of the compressors 1, 1; 41, a room temperature sensor which detects indoor air temperature; Is a pressure sensor that detects the pressure of the suction gas refrigerant, 44 is an outside air temperature sensor that detects the outside air temperature, and 45 and 46 are closing valves.

In the refrigeration apparatus configured as described above, the following operational effects can be obtained. (I) Cooling operation At this time, the four-way switching valve 2 is switched as shown by the solid line, the electromagnetic switching valve 13 is opened, the electromagnetic switching valve 16 is closed, the electromagnetic switching valve 24 is opened, and the electromagnetic switching valve 24 is opened. On-off valve 2
6 is closed, the electromagnetic on-off valve 30 is closed, the electromagnetic on-off valves 31 and 32 are opened, and the electromagnetic on-off valve 39 is opened. In the air conditioning refrigerant circuit A, the compressors 1 and 2 are closed.
After the gas refrigerant discharged from 1 is condensed and liquefied in the heat source side heat exchanger 3 acting as a condenser, the gas refrigerant is sent to the receiver 7 through the check valve 15 and the bridge circuit 14, and the liquid in the receiver 7 The liquid refrigerant from the phase portion is supercooled by heat exchange with outdoor air in the first subcooling heat exchanger 8, and when further supercooling is required (that is, when the electromagnetic on-off valve 13 is opened) ), The supercooled liquid refrigerant from the first supercooled heat exchanger 8 is a part of the supercooled liquid refrigerant in the second supercooled heat exchanger 9 and is decompressed by the temperature-sensitive expansion valve 10. The vapor-liquid mixed refrigerant is further supercooled by the latent heat of vaporization, decompressed by the expansion valve 4, supplied to the use-side heat exchanger 5 and evaporated, and the obtained latent heat of vaporization is used as a cooling source for cooling. The refrigerant is returned to the compressors 1, 1.

In the refrigeration refrigerant circuit B, the refrigerant decompressed by the expansion valve 4 branches off from the air conditioning refrigerant circuit A and passes through the plate heat exchanger 19 to the refrigeration evaporator 6.
, And is evaporated, and the obtained latent heat of evaporation is used as a cold heat source for refrigeration, and then returned to the compressors 1, 1.

Further, in the refrigeration circuit C, gas refrigerant discharged from the refrigeration compressor 18 flows through the liquid pipe 17 in the refrigeration circuit B in the plate heat exchanger 19 acting as a condenser. After being condensed and liquefied by heat exchange with the liquid refrigerant, the pressure is reduced by the expansion valve 20 and supplied to the refrigeration evaporator 21 to evaporate. The obtained latent heat of evaporation is used as a refrigeration cold source, and then the accumulator 22 Is returned to the compressor 18 through the compressor.

When the temperature inside the refrigerator / freezer is high, it is desirable to operate the indoor fan 33 at low speed in order to prevent drafts in the refrigerator / freezer.

Also, during the cooling operation in which the evaporator 6 is operating, when the high pressure becomes lower than a predetermined value,
The four-way switching valve 2 may be switched to the heating operation side, and the operation may be switched to the heat recovery heating operation in which the refrigerant condensed and liquefied in the use side heat exchanger 5 is supplied to the evaporator 6 via the pressure reducing mechanism 4. it can. In this way, when the high pressure in the heat source side heat exchanger 3 becomes lower than a predetermined value (in other words, when the outside air temperature becomes low) during a cooling operation or the like in the intermediate period, the use side heat The refrigerant condensed and liquefied by the exchanger 5 is switched to the heat recovery and heating operation in which the refrigerant is supplied to the evaporator 6 via the decompression mechanism 4, and the energy saving operation can be performed. (II) Heating operation At this time, the four-way switching valve 2 is switched as shown by the solid line, the electromagnetic switching valve 13 is opened, the electromagnetic switching valve 16 is closed, the electromagnetic switching valve 24 is closed, and the electromagnetic switching valve 24 is closed. On-off valve 2
6 is opened, the electromagnetic on / off valve 30 is closed, the electromagnetic on / off valves 31 and 32 are opened, and the electromagnetic on / off valve 39 is opened. In the air conditioning refrigerant circuit A, the compressors 1 and 2 are opened.
After the gas refrigerant discharged from 1 is condensed and liquefied in the use side heat exchanger 5 acting as a condenser, and the obtained condensation latent heat is used as a heating heat source, the check valve 15 and the bridge circuit 14 are turned off. The liquid refrigerant sent to the receiver 7 via the liquid phase portion of the receiver 7 is supercooled by heat exchange with outdoor air in the first subcooling heat exchanger 8, and further supercooling is required (ie, , When the solenoid on-off valve 13 is opened), the first subcooling heat exchanger 8
Is supercooled further by the latent heat of vaporization of the gas-liquid mixed refrigerant which is a part of the supercooled liquid refrigerant and is decompressed by the temperature-sensitive expansion valve 10 in the second supercooled heat exchanger 9. The pressure is reduced by the expansion valve 4 and supplied to the evaporator 6 via the plate heat exchanger 19 in the refrigeration refrigerant circuit B to evaporate. The obtained latent heat of evaporation is used as a refrigeration cold heat source. Refluxed to 1.

In the refrigeration circuit C, the gas refrigerant discharged from the refrigeration compressor 18 flows through the liquid pipe 17 in the refrigeration circuit B in the plate heat exchanger 19 acting as a condenser. After being condensed and liquefied by heat exchange with the liquid refrigerant, the pressure is reduced by the expansion valve 20 and supplied to the refrigerating evaporator 21 to evaporate. The obtained latent heat of evaporation is used as a refrigerating cold heat source.
The refrigerant is returned to the compressor 18 through the line 2.

As described above, in the present embodiment, the evaporator 6 in the refrigeration refrigerant circuit B during the heating operation.
Thus, the waste heat used as the cold heat source for refrigeration is recovered in the use-side heat exchanger 5 as the heating heat source. At this time, the operation of one of the compressors 1 and 1 has been stopped (in other words, the capacity of the compressor has been reduced).

When the heating load is small (ie, the difference between the set temperature and the room temperature is small or the high pressure exceeds a predetermined value), the refrigeration heat source in the evaporator 6 becomes insufficient. It is preferable to switch the path switching valve 2 to the cooling operation side to perform a cooling cycle, open the electromagnetic on-off valve 16, and operate the heat source side heat exchanger 3 as a condenser. In this way, even if the indoor heating load in the use-side heat exchanger 5 is reduced and the amount of heat in the use-side heat exchanger 5 and the amount of cool heat required in the evaporator 6 cannot be balanced (in other words, Even if the high pressure exceeds a predetermined value, the four-way switching valve 2 is switched to the cooling operation side, and the heat source side heat exchanger 3 acts as a condenser. Then, the cooling capacity) can be secured. During the operation in the cooling cycle, when the heating load increases (that is, when the difference between the set temperature and the room temperature increases), the four-way switching valve 2 is switched to the heating operation side to perform the heating cycle and perform the electromagnetic switching. The valve 16 may be closed to return to the heating heat recovery operation in which the use side heat exchanger 5 acts as a condenser.

When the refrigeration / refrigeration load is reduced during the heating operation (in other words, when the low pressure, which is the suction pressure of the compressors 1, 1, is lower than a predetermined value), the indoor fan 33 When the air volume is automatically reduced, the capacity balance between the use side heat exchanger 5 and the evaporator 6 can be obtained.

Further, when the refrigeration / refrigeration load is reduced during the heating operation (in other words, when the low pressure which is the suction pressure of the compressors 1, 1 becomes lower than a predetermined value),
Since the heating heat source in the use side heat exchanger 5 becomes insufficient, it is preferable to open the electromagnetic on-off valve 16 and make the heat source side heat exchanger 3 act as an evaporator. In this way, when the low pressure becomes lower than the predetermined value during the heat recovery and heating operation (in other words, when the load on the evaporator 6 is reduced),
The heat source side heat exchanger 3 is made to function as an evaporator, and a heating heat source in the use side heat exchanger 5 is secured. When the low pressure becomes higher than the predetermined value, the operation is returned to the heat recovery and heating operation.

Further, even when the driving of the indoor fan 33 is stopped (that is, when the operation of the use side heat exchanger 5 is stopped), if the room temperature is lower than a certain level, the four-way switching valve 2 is moved to the heating operation side. The heating and heat recovery operation may be automatically performed by switching the operation and closing the electromagnetic on-off valve 16.

[0035]

According to the first aspect of the present invention, the compressor 1 includes:
A four-way switching valve 2, a heat source-side heat exchanger 3 acting as a condenser during cooling operation and acting as an evaporator during heating operation,
A decompression mechanism 4, a use-side heat exchanger 5 for indoor air conditioning that acts as an evaporator during a cooling operation and acts as a condenser during a heating operation, and a refrigeration or refrigeration connected in parallel with the use-side heat exchanger 5. In the refrigerating apparatus provided with the evaporator 6, the refrigerant decompressed by the decompression mechanism 4 during the heating operation is
The heat source side heat exchanger 3 is configured to supply to the evaporator 6 and the heat source side heat exchanger 3 so that the heat source side heat exchanger 3 functions as a condenser and the use side heat exchanger 5 functions as an evaporator during cooling operation. In order to perform indoor cooling and to refrigerate products and the like by the evaporator 6, the heat source side heat exchanger 3 acts as an evaporator during the heating operation, while the use side heat exchanger 5 functions as a condenser. Since it is possible to perform the indoor heating and to cool the goods by the evaporator 6, the heat source for the indoor heating is secured by the heat source side heat exchanger 3 even if the evaporator 6 stops the thermostat. There is an effect that can be.

As in the invention of claim 2, claim 1
In the refrigerating apparatus described above, when an on-off valve 16 that controls refrigerant flow is provided so that the refrigerant depressurized by the decompression mechanism 4 can be supplied only to the evaporator 6 during the heating operation, the refrigerant is opened and closed during the heating operation. When the valve 16 is closed,
Waste heat used as a refrigeration cold heat source in the evaporator 6 can be recovered as a heating heat source in the use side heat exchanger 5.

As in the invention of claim 3, claim 2
In the refrigerating apparatus described above, when the on-off valve 16 is opened when the operation of the evaporator 6 is stopped, when the evaporator 6 is stopped by the thermostat, the heat source for room heating is supplied to the heat source side heat exchanger 3. Can be secured.

As in the invention of claim 4, claim 1
In the refrigerating apparatus described above, a heat recovery heating operation is performed in which the evaporator 6 is operated and the refrigerant condensed and liquefied in the use side heat exchanger 5 is supplied to the evaporator 6 via the pressure reducing mechanism 4. When the high-pressure pressure exceeds a predetermined value during the operation, when the four-way switching valve 2 is switched to the cooling operation side, the indoor heating load in the use side heat exchanger 5 is reduced and the use side heat exchanger When the balance between the amount of heat at 5 and the amount of cooling required by the evaporator 6 cannot be balanced (in other words, when the high pressure exceeds a predetermined value), the four-way switching valve 2 is switched to the cooling operation side, and the heat source side The heat exchanger 3 acts as a condenser, and the amount of cold heat (in other words, cooling capacity) in the evaporator 6 can be secured.

As in the invention of claim 5, claim 1
In the refrigerating apparatus described above, when the high-pressure pressure becomes lower than a predetermined value during the cooling operation in which the evaporator 6 is operated, the four-way switching valve 2 is switched to the heating operation side and the use-side heat exchanger 5 is switched. If the refrigerant condensed and liquefied is switched to the heat recovery heating operation in which the refrigerant condensed and liquefied is supplied to the evaporator 6 via the pressure reducing mechanism 4, the high pressure pressure in the heat source side heat exchanger 3 during the cooling operation in the intermediate period or the like. Is lower than a predetermined value (in other words, when the outside air temperature is low), the heat supplied to the evaporator 6 through the pressure reducing mechanism 4 by the refrigerant condensed and liquefied in the use side heat exchanger 5 The mode is switched to the recovery heating operation, and the energy saving operation becomes possible.

As in the invention of claim 6, claim 1
In the refrigerating apparatus described above, a heat recovery heating operation is performed in which the evaporator 6 is operated and the refrigerant condensed and liquefied in the use side heat exchanger 5 is supplied to the evaporator 6 via the pressure reducing mechanism 4. When the low pressure is lower than a predetermined value, the heat source side heat exchanger 3 is operated as an evaporator, while when the low pressure is higher than a predetermined value, the heat source side heat exchanger 3 is not operated. When the low pressure becomes lower than the predetermined value during the heat recovery heating operation (in other words, when the load on the evaporator 6 is reduced), the heat source side heat exchanger 3 acts as an evaporator. Thus, a heating heat source in the use side heat exchanger 5 is secured. When the low pressure becomes higher than the predetermined value, the operation is returned to the heat recovery and heating operation.

As in the invention of claim 7, claim 1
In the refrigeration apparatus described above, when the evaporator 6 is operated and the operation of the use side heat exchanger 5 is stopped,
If the room temperature is equal to or lower than a predetermined value, the refrigerant condensed and liquefied in the use side heat exchanger 5 is passed through the pressure reducing mechanism 4 to the evaporator 6.
If the room temperature becomes equal to or lower than a predetermined value even when the use side heat exchanger 5 is stopped, the heat source side heat exchanger 3
Is forcibly switched to the heat recovery and heating operation that does not use the fuel cell, and energy saving operation is possible.

In the refrigeration apparatus according to any one of claims 1, 2 and 3, as in the invention of claim 8, when the capacity of the compressor 1 is controllable, the evaporator 6
Thus, when the waste heat used as the cold heat source for refrigeration is recovered as the heating heat source in the use-side heat exchanger 5, the capacity of the compressor 1 can be controlled, and power consumption can be saved.

[Brief description of the drawings]

FIG. 1 is a refrigerant circuit diagram of a refrigeration apparatus according to an embodiment of the present invention.

[Explanation of symbols]

1 is a compressor, 2 is a four-way switching valve, 3 is a heat source side heat exchanger, 4
Is a pressure reducing mechanism (expansion valve), 5 is a use side heat exchanger, 6 is an evaporator, and 16 is an on-off valve (electromagnetic on-off valve).

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kazuhide Nomura 1304 Kanaokacho, Sakai-shi, Osaka Daikin Industries Inside Kanaoka Plant of Sakai Seisakusho Co., Ltd. (72) Masaaki Takegami 1304 Kanaokacho, Sakai-shi, Osaka Daikin Industries Inside the Sakai Works Kanaoka Plant (72) Inventor Akitoshi Ueno 1304 Kanaokacho, Sakai City, Osaka Daikin Industries Inside the Sakai Works Kanaoka Plant F-term (reference) 3L092 AA02 BA01 BA16 BA26 BA27 CA04 DA01 DA03 DA11 DA14 DA19 EA03 EA05 EA15 FA03 FA22 FA23

Claims (8)

[Claims] 1. A compressor (1), a four-way switching valve (2),
A heat source side heat exchanger (3) that acts as a condenser during cooling operation and acts as an evaporator during heating operation, a pressure reducing mechanism (4), acts as an evaporator during cooling operation, and acts as a condenser during heating operation And a refrigeration or freezing evaporator (6) connected in parallel with the use-side heat exchanger (5). A refrigeration apparatus characterized in that a refrigerant decompressed by a mechanism (4) is supplied to the evaporator (6) and the heat source side heat exchanger (3). 2. The pressure reducing mechanism (4) during a heating operation.
The refrigerating apparatus according to claim 1, further comprising an on-off valve (16) for controlling the flow of the refrigerant so that the refrigerant depressurized in (1) can be supplied only to the evaporator (6). 3. The refrigeration system according to claim 2, wherein the on-off valve (16) is opened when the operation of the evaporator (6) is stopped. 4. The evaporator (6) is operated, and the refrigerant condensed and liquefied in the use side heat exchanger (5) is supplied to the evaporator (6) via the pressure reducing mechanism (4). The refrigeration system according to claim 1, wherein the four-way switching valve (2) is switched to a cooling operation side when the high pressure exceeds a predetermined value during the heat recovery and heating operation. . 5. When the high pressure becomes lower than a predetermined value during a cooling operation in which the evaporator (6) is operated, the four-way switching valve (2) is switched to a heating operation side and the use side heat is switched. The refrigeration system according to claim 1, wherein the refrigerant is condensed and liquefied in the exchanger (5), and the operation is switched to a heat recovery and heating operation in which the refrigerant is supplied to the evaporator (6) via the pressure reducing mechanism (4). 6. The evaporator (6) is operated, and the refrigerant condensed and liquefied in the use side heat exchanger (5) is supplied to the evaporator (6) via the pressure reducing mechanism (4). When the low pressure is lower than a predetermined value during the heat recovery heating operation, the heat source side heat exchanger (3) is operated as an evaporator while the low pressure is higher than a predetermined value. The refrigeration apparatus according to claim 1, wherein the heat source side heat exchanger (3) is not operated. 7. When the room temperature is equal to or lower than a predetermined value when the evaporator (6) is operated and the operation of the use side heat exchanger (5) is stopped, the use side heat exchanger (5) is used. 2. The method according to claim 1, wherein the refrigerant condensed and liquefied in the step (1) is forcibly shifted to a heat recovery and heating operation for supplying the refrigerant to the evaporator (6) via the pressure reducing mechanism (4). Refrigeration equipment. 8. The refrigeration apparatus according to claim 1, wherein the compressor (1) is capable of controlling the capacity.