JP2015161470A - Cool temperature storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrict reduction of cooling efficiency.SOLUTION: This invention relates to a cool temperature storage device 10 comprising a refrigeration chamber 21; a heat storage chamber 22; a cooling means 55 for cooling both refrigeration chamber 21 and the heat storage chamber 22; heating means 45 for heating the heat storage chamber 22; and a control part 60 to cause the cooling means 55 to perform both chambers cooling operation for cooling both chambers of the refrigeration chamber 21 and the heat storage chamber 22 and cool the refrigeration chamber 21 and the heating means 45 to perform a single chamber heating operation for heating the heat storage chamber 22. The control part 60 controls the cooling means 55 in such a way that a temperature in the refrigeration chamber 21 is in a range of the first temperature difference A1 in respect to a set temperature TA at the time of the both chambers cooling operation, and controls the cooling means 55 in such a way that a temperature in the refrigeration chamber 21 is in a range of the second temperature difference A2 different from the first temperature difference A1 in respect to the set temperature TA at the time of the single chamber heating operation.

Description

  The present invention relates to a refrigeration apparatus.

Conventionally, a refrigeration apparatus provided with a refrigeration room and a refrigeration room is known (see, for example, Patent Document 1 below).
This type of refrigeration apparatus stores, for example, cold food and hot food prepared for cooking on the previous day in the refrigeration room and the refrigeration room, respectively, and both the refrigeration room and the refrigeration room by cooling means such as a compressor. Cooling operation of both chambers is performed in which the chambers are chilled so that the chambers are at a predetermined set temperature. When the predetermined time has elapsed, the cold food is thawed at a low temperature by the cooling means and then kept at a low temperature, while the hot food is reheated in the warming room by the heating means, and then subjected to a one-chamber heating operation. It is like that.

JP 2011-43310 A

  By the way, the cooling means is controlled so that the temperature of the refrigerator compartment at the time of cooling falls within a predetermined temperature difference with respect to a preset temperature. For example, when the temperature difference is ± 2 K (Kelvin), if the set temperature is 3 ° C., the cooling starts when the temperature reaches the upper limit of cooling (5 ° C.) that is 2 K higher than the set temperature. Cooling ends when the temperature falls below the lower limit (1 ° C.) of 2K lower cooling. The temperature difference with respect to the set temperature of the refrigerating chamber is set to be the same between the cold storage operation of both chambers and the heating operation of one chamber.

  However, unlike the cooling of both chambers, the temperature of the refrigerator compartment that is cooled during the heating operation is affected by the heat of the refrigerator compartment side. For this reason, during the heating operation of the warming room, as in the cooling operation of both the chambers, there is a problem that efficient cooling cannot always be performed if cooling is performed within a predetermined temperature difference with respect to the set temperature. .

  This invention is completed based on the above situations, Comprising: It aims at providing the cold storage apparatus which can suppress the fall of cooling efficiency.

  The refrigeration apparatus of the present invention includes a refrigeration room, a refrigeration room, cooling means for cooling the refrigeration room and the refrigeration room, heating means for heating the refrigeration room, and the refrigeration room with the cooling means. And a two-chamber cooling operation for cooling both chambers of the warming chamber, and a single chamber heating operation in which the cooling means cools the cold storage chamber and the heating means heats the warming chamber. And a control unit that controls the temperature of the refrigerator compartment to be within a range of a first temperature difference with respect to a set temperature during the both-chamber cooling operation. Controlling the cooling means, and controlling the cooling means so that the temperature of the refrigerator compartment is within the second temperature difference range different from the first temperature difference with respect to the set temperature during the one-chamber heating operation. It has a feature.

  According to this configuration, during the one-chamber heating operation, the cooling means is controlled so that the temperature of the refrigerator compartment is within the second temperature difference range different from the first temperature difference with respect to the set temperature. The refrigerator can be cooled within a range of an efficient temperature difference in consideration of the influence of heat received from the refrigerator compartment with respect to the temperature. Therefore, it is possible to suppress a decrease in cooling efficiency of the refrigeration apparatus.

  In addition to the above configuration, the following configuration is preferable.

The second temperature difference is smaller than the first temperature difference.
If it is attempted to cool the refrigerator compartment to the lower limit of the first temperature difference while receiving heat from the refrigerator compartment, the cooling means will be operated continuously for a long period of time, and frost will accumulate in the evaporator and cooling efficiency may be reduced. Concerned. According to this configuration, since the second temperature difference is smaller than the first temperature difference, it is not necessary to continuously operate the cooling means for a long time as compared with the case of cooling to the lower limit of the first temperature difference. Decrease in cooling efficiency due to accumulation of frost can be suppressed.

  According to the present invention, it is possible to suppress a decrease in cooling efficiency.

The perspective view which shows the cold storage apparatus of Embodiment 1. Exploded perspective view of refrigeration equipment Sectional view (front view) showing refrigeration equipment Diagram showing the cooling cycle Block diagram showing electrical configuration of refrigeration unit Flow chart showing control of refrigeration unit The figure which shows the temperature change according to the elapsed time of a cold room and a warm room The figure which shows the temperature change according to the elapsed time of the refrigeration room and warm room of related technology 1 The figure which shows the temperature change according to the elapsed time of the refrigeration room and warm room of related technology 2

One embodiment of the refrigeration apparatus will be described with reference to FIGS.
As shown in FIG. 1, the refrigeration / heating apparatus 10 includes a cart 11 and a station 30 that stores the cart 11 in a removable manner. In this embodiment, in the front-rear direction, the direction in which the cart 11 is taken out from the station 30 is the front, and the direction in which the cart 11 is inserted into the station 30 is the rear.
As shown in FIG. 2, the cart 11 includes a cart body 12 formed of a heat insulating box and a frame cart 18 that stores a tray 19. The cart body 12 is open on both front and rear sides, and a double-spread type heat insulating door 13 is attached to each opening. A caster 14 for moving the cart body 12 is provided on the bottom surface of the cart body 12. In the frame cart 18, metal frames 16 stand up from left and right side edges of the bottom plate 15. A caster 17 for moving the frame cart 18 is provided on the bottom surface of the bottom plate 15, and the frame cart 18 can be inserted into and removed from the front side of the cart body 12. A partition wall 20 is provided in a substantially central portion in the left-right direction of the frame cart 18 over the entire front-rear direction.

  As shown in FIG. 3, in the state where the frame cart 18 is housed in the cart body 12, the interior of the cart body 12 is divided into left and right by the partition wall 20. Thus, when the front and rear heat insulating doors 13 are closed, the refrigerating chamber 21 is formed on one side (right side) partitioned by the partition wall 20 and the warming chamber 22 is formed on the other side (left side). Cold air generated on the station 30 side is circulated and supplied to the refrigerating chamber 21, and warm air or cold air generated on the station 30 side is circulated and supplied to the refrigerating chamber 22. The left and right side walls of the cart body 12 are provided with air flow passages L1 over substantially the entire surface. Thereby, warm air or cold air is blown out from each air flow path L1 to the refrigerator compartment 21 and the refrigerator compartment 22 over a plurality of stages. On the left and right side edges of the ceiling wall of the cart body 12, there are formed blowout openings 23 that are elongated in the front-rear direction so as to communicate with the upper end of the air flow passage L1. On the other hand, a suction passage 24 is formed in the center of the ceiling wall to communicate with the warm room 22 or the cold room 21 individually.

  The station 30 has a substantially box shape with an open front, and the cart 11 can be taken in and out through the opening. A liquid crystal panel 31 is provided in front of the station 30. The liquid crystal panel 31 has functions as an operation unit 32 (see FIG. 5) that can be operated by the user and a display unit 33 that can be viewed. In the upper part of the station 30, two heat exchange chambers 35A and 35B are arranged side by side. A cooler 37A (see FIG. 4) is provided in the first heat exchange chamber 35A (the heat exchange chamber on the right side of the front view) disposed above the refrigerator compartment 21, and the second heat exchanger chamber 22A disposed above the refrigerator compartment 22 is provided. The heat exchange chamber 35B (the heat exchange chamber on the left side of the front view) is provided with a cooler 37B and heating means 45 (see FIG. 4) including a heater. Further, circulation fans 41 and 42 are provided in the heat exchange chambers 35A and 35B, respectively. The circulation fans 41 and 42 are provided with a turbo type fan motor, and when driven, air sucked from the suction port on the lower surface of the fan is radially discharged from the discharge port on the peripheral surface.

  An introduction port 50 is provided at the bottom of each of the heat exchange chambers 35A and 35B. Each inlet 50 is arranged above the inlet 24 of the warm chamber 22 and the inlet 24 of the refrigerator 21 and is connected to the corresponding inlet 24 respectively. In addition, strip-shaped outlets 51 are provided at the bottoms of the heat exchange chambers 35A and 35B, respectively. Each outlet 51 is connected to the outlet 23 corresponding to the warm room 22 and the cold room 21, respectively. When the cart 11 is stored in the station 30 and the corresponding passages are connected to each other, between the first heat exchange chamber 35 </ b> A and the refrigerator compartment 21, and between the second heat exchange chamber 35 </ b> B and the refrigerator compartment 22. In addition, air circulation paths are respectively formed.

  As shown in FIG. 4, the coolers 37A and 37B are connected in parallel with the expansion valves 48A and 48B, and are circulated and connected by the compressor 46, the condenser 47A and the refrigerant pipe P, thereby providing a refrigeration circuit (cooling cycle). It is composed. Further, this refrigeration circuit includes a condenser fan 47B that blows air to the condenser 47A, a liquid receiver 38, a dryer 53, temperature sensing cylinders 54A and 54B, and electromagnetic valves 49A and 49B. The electromagnetic valves 49A and 49B are provided on the refrigerant inflow pipes (upstream of the expansion valves 48A and 48B) to the coolers 37A and 37B in the refrigerant pipe P. By opening and closing solenoid valves 49A and 49B in accordance with control signals from the control unit 60 described later, the inflow of refrigerant into the coolers 37A and 37B is controlled, and the temperatures of the refrigerator compartment 21 and the refrigerator compartment 22 are controlled. . The compressor 46, the condenser 47 </ b> A, the expansion valves 48 </ b> A and 48 </ b> B, the coolers 37 </ b> A and 37 </ b> B, and the electromagnetic valves 49 </ b> A and 49 </ b> B serve as cooling means 55 that cools the refrigerator compartment 21 and the refrigerator compartment 22.

Next, the electrical configuration of the refrigeration apparatus 10 will be described with reference to FIG.
The refrigeration apparatus 10 includes a control circuit in which a plurality of electronic components are mounted on a circuit board. As shown in FIG. 5, the control circuit 60 includes a control unit 60 including a microcomputer that executes a predetermined program. (An example of “control means”). The control unit 60 includes a storage unit 61 and a timer 62. The control unit 60 is configured to perform a cold-reserving operation (an example of “both-chamber cooling operation”) that keeps both the refrigerator compartment 21 and the refrigerator compartment 22 cold, and keeps the refrigerator compartment 21 cold and warm. The heating mode for performing the heating operation for heating the chamber 22 (an example of “one-chamber heating operation”) can be switched.

  The control unit 60 controls the cooling means 55 so as to perform a cold keeping operation for keeping both the cold room 21 and the warm room 22 in the cold keeping mode. In this cold insulation mode, the first temperature difference A1 is set as the temperature range (differential) of the start and end of cooling by the cooling means 55 with respect to the set temperature TA which is the target temperature for cooling of the refrigerator compartment 21 and the refrigerator compartment 22. Is set. In the present embodiment, the set temperature TA is set to 3 ° C., and the first temperature difference A1 is set to 2K (Kelvin). The control unit 60 switches the cold insulation mode to the heating mode at the set time (when the catering time is set, a predetermined time before the catering time).

  When in the heating mode, the control unit 60 controls the cooling means 55 and the heating means 45 so as to perform a heating operation in which the cooling chamber 21 is cooled by the cooling means 55 and the heating chamber 22 is heated by the heating means 45. To do. In this heating mode, the set temperature TA, which is the target temperature for cooling the refrigerator compartment 21, is the same as that in the cold insulation operation, but the second temperature difference A2 is used as the temperature range (differential) of the start and end of cooling by the cooling means 55. Is set. The first temperature difference A1 and the second temperature difference A2 are set to different numbers, and in the present embodiment, the second temperature difference A2 is set to 1K (Kelvin). Note that the set temperature TA, the first temperature difference A1, and the second temperature difference A2 are stored in the storage unit 61 in advance, but may be changed from the liquid crystal panel 31.

Connected to the input side of the control unit 60 are an operation unit 32 and temperature detection means 61A and 61B composed of thermistors for detecting the temperatures of the refrigerating room 21 and the warming room 22 respectively. As a result, the input signal of the operation unit 32 and the output signals of the temperature detection means 61A and 61B are input to the control unit 60.
On the output side of the control unit 60, a cooling unit 55, a heating unit 45, circulation fans 41 and 42, and a display unit 33 are connected. As a result, the cooling means 55, the heating means 45, the circulation fans 41 and 42, and the display section 33 operate in accordance with a control signal from the control section 60.

Control of the refrigeration apparatus 10 will be described with reference to FIG.
First, cooked hot and cold foods are chilled in a prefabricated refrigerator or the like. Next, hot and cold foods taken out from the prefabricated refrigerator or the like in the next morning or the like are placed on the tray 19, and each tray 19 is stored in a plurality of stages across the warming room 22 and the cold room 21 of the cart 11. Into station 30. Then, as shown in FIG. 6, the control unit 60 initially sets the current mode to the cold insulation mode (S1). In this cold-retaining mode, the cooling means 55 is operated to circulate and supply cold air to the refrigerating room 22 and the refrigerating room 21, and the refrigerating room 22 and refrigerating room 21 are controlled according to the temperatures detected by the temperature detecting means 61A and 61B. The solenoid valves 49A and 49B are opened and closed (the cooling means 55 is operated) so that both chambers are within the first temperature difference A1 with respect to the set temperature TA (S2). Specifically, in the cold storage mode, the temperature difference width with respect to the set temperature TA = 3 (° C.) of the refrigerator compartment 21 and the refrigerator compartment 22 is set to the first temperature difference A1 = ± 2 (K). The cooling means 55 cools to 1 ° C., stops cooling, and repeats the operation to start cooling when the temperature reaches 5 ° C. (see FIG. 7).

  When the timer 62 reaches the start time of the heating operation (“YES” in S3), the control unit 60 switches the cold insulation mode to the heating mode (S4). In this heating mode, the control unit 60 opens and closes the electromagnetic valves 49A and 49B so that the refrigerating chamber 21 is in the range of the second temperature difference A2 (<A1) with respect to the set temperature TA (the cooling means 55 is turned on). In addition, the heating means 45 is operated to operate the heating chamber 22 to operate the heating chamber 22 (S5). Specifically, in the heating mode, the width of the temperature difference with respect to the set temperature TA = 3 (° C.) of the refrigerator compartment 21 is set to the second temperature difference A2 = ± 1 (K). The cooling is stopped after cooling to 2 ° C, and the operation of starting the cooling is repeated when the temperature reaches 4 ° C. As a result, the hot food stored in the chilled state is reheated by circulating the warm air in the warm room 22, and the cold food in the second temperature difference A2 with respect to the set temperature TA in the cold room 21. Is stored refrigerated. When the heating operation end time (layout time) is reached (“YES” in S6), the cart 11 is pulled out from the station 30 and the tray 19 is taken out for serving.

According to the said embodiment, there exist the following effects | actions and effects.
The refrigeration apparatus 10 is refrigerated in the refrigeration chamber 21, the refrigeration chamber 22, the refrigeration chamber 55 and the cooling means 55 for cooling the refrigeration chamber 22, the heating means 45 for heating the refrigeration chamber 22, and the cooling means 55. The cooler 55 cools the refrigerator compartment 21 and the heater 45 heats the refrigerator compartment 22 while performing a cold insulation operation (both compartment cooling operation) for cooling both the chamber 21 and the refrigerator compartment 22. A control unit 60 (control unit) that performs a heating operation (one-chamber heating operation), and the control unit 60 (control unit) is configured such that the temperature of the refrigerating chamber 21 is first with respect to the set temperature TA during the cold storage operation. While controlling the cooling means 55 to be within the range of the temperature difference A1, and during the heating operation, the temperature of the refrigerator compartment 21 is within the range of the second temperature difference A2 different from the first temperature difference A1 with respect to the set temperature TA. The cooling means 55 is controlled so that

  According to the present embodiment, at the time of heating operation (at the time of one-chamber heating operation), the temperature of the refrigerator compartment 21 falls within the range of the second temperature difference A2 that is different from the first temperature difference A1 with respect to the set temperature TA. Since the cooling means 55 is controlled as described above, the refrigerator compartment 21 can be cooled within a range of an efficient temperature difference in consideration of the influence of heat received from the refrigerator compartment 22 side with respect to the set temperature TA. Therefore, it is possible to suppress a decrease in the cooling efficiency of the refrigeration apparatus 10.

Further, the second temperature difference A2 is smaller than the first temperature difference A1.
If the refrigerator 21 is cooled to the lower limit of the first temperature difference A1 while receiving heat from the refrigerator compartment 22, the cooling means 55 will be operated continuously for a long time, and frost accumulates in the cooler 37A (evaporator). In addition, there is a concern that the cooling efficiency is lowered. According to this embodiment, since the second temperature difference A2 is smaller than the first temperature difference A1, it is necessary to operate the cooling means 55 continuously for a long time as compared with the case of cooling to the lower limit of the first temperature difference A1. The cooler 37A (evaporator) is defrosted when the compressor 46 is turned off, and an efficient operation can be performed at the next operation. Therefore, it is possible to suppress a decrease in cooling efficiency due to accumulation of frost in the cooler 37A (evaporator).
In addition, since a large amount of steam generated during heating during the heating operation can be recovered, condensation can be prevented.

<Related technology 1>
The related technique 1 will be described with reference to FIG.
When the temperature of the warm room 22 and the cold room 21 exceeds the upper limit value of a predetermined temperature difference with respect to the set temperature TA, cooling is started (flowing refrigerant), but when the compressor 46 is not moving at that time The compressor 46 is moved. When both chambers need not be cooled, the compressor 46 is stopped. In this case, since cooling is performed according to the temperature of each room, the time from when the compressor 46 is turned off to when it is turned on may be shortened.

As an advanced control, there is a method of cooling the other room when one of the warm room 22 and the cold room 21 is not required to be cooled. However, the disadvantage is that the average temperature in the refrigerator is lower than the set temperature TA and the interval between on and off of the compressor 46 is long, but if the on time is long, the evaporator becomes frosted and the cooling efficiency deteriorates. There is a problem. Therefore, as shown in FIG. 8, when one of the warm room 22 and the cold room 21 (referred to as room A) reaches the lower limit temperature (TA-2K), the electromagnetic valve 49A in that room is turned off. When the other room (referred to as room B) reaches the lower limit temperature (TA-2K), the room A is confirmed, and if it is equal to or higher than the lower limit temperature (TA-2K), the electromagnetic valve 49A in the room A is turned on. When the room A reaches the lower limit temperature (TA-2K), the compressor 46 and the condenser fan 47B are turned off. This work is completed in one round trip in the room.
In this way, the on / off time of the compressor 46 can be secured, and the average temperature in the refrigerator can be brought close to the set temperature. Further, since the on-time of the compressor 46 does not become extremely long, the operation in a state where the cooler 37A (evaporator) is frosted is less efficient. Furthermore, if there is a lot of steam in the warm room 22, condensation tends to form on the partition with the cold room 21, so it is not preferable to increase the amount of steam. However, according to this related technique 1, the cooler 37A (evaporator) Since it is difficult to form frost, it is possible to suppress an increase in steam in the warehouse when the operation is shifted to the heating operation.

<Related technology 2>
Related technology 2 will be described.
The related technique 2 changes the operating temperature of liquid injection according to the internal temperature and the operating state. As shown by a broken line in FIG. 4, the cold / hot storage is provided with a liquid injection circuit 70 (see FIG. 4) that sends the refrigerant between the condenser 47 </ b> A and the coolers 37 </ b> A and 37 </ b> B to the compressor 46. The liquid injection circuit 70 includes an electromagnetic valve 71, sends high-pressure liquid refrigerant into the cylinder of the compressor 46, and cools the motor of the compressor 46 by lowering the temperature of the discharge gas by the latent heat of vaporization of the liquid refrigerant. Is. A discharge pipe thermistor 52 is attached to the discharge pipe of the compressor 46. The temperature of the discharge pipe thermistor 52 is output to the control unit 60 and read into the programmable controller (PLC).

  As a restriction on the use of the compressor 46, there are usually a discharge pipe temperature, a transition period of 100 ° C. or less, and a stable period of 85 ° C. or less. However, in this related technology, as shown in FIG. The temperature at which liquid injection is started is divided into the cooling period as the stable period and the rest as the transition period. As shown in FIG. 9, liquid injection is performed during a day of operation (24 hours are shown in FIG. 9) with a slight transition period and many stable periods. Specifically, in the transition period, the liquid injection is turned on at 95 ° C. and turned off at 85 ° C. In the stable period, liquid injection is turned on at 78 ° C. and turned off at 68 ° C.

In this way, at the start of cooling, which requires a cooling capacity, and at the time of heating, the liquid injection operation can be reduced to suppress a decrease in the capacity of the cooling means 55. In addition, since most operations are controlled with a low temperature target, the life of the compressor 46 can be improved. Furthermore, although the discharge pipe thermo is difficult to attach and the operating temperature varies depending on the mounting method, the use of the discharge pipe thermistor 52 can suppress the difference in operating temperature depending on the mounting method.
<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In the above embodiment, the refrigeration / heating apparatus 10 that stores the cart 11 in the station 30 has been described. However, the present invention is not limited to this. The present invention can be applied to, for example, the refrigeration apparatus 10 provided with the heating / cooling means 55 on the cart 11 side.

(2) The set temperature TA, the first temperature difference A1, and the second temperature difference A2 are not limited to the set temperature and the temperature difference of the above embodiment, and can be changed to various numbers. For example, in the above embodiment, the second temperature difference A2 is smaller than the first temperature difference A1, but the present invention is not limited to this, and the second temperature difference A2 may be larger than the first temperature difference A1.

(3) The first temperature difference A1 and the second temperature difference A2 are the same temperature difference between the high temperature side and the low temperature side with respect to the set temperature TA, but with respect to the set temperature TA. The difference between the high temperature side and the low temperature side may be different. Further, only the temperature difference between the high temperature side and the low temperature side may be different between the cold operation and the heating operation.

10: Refrigerator / heater, 21: Refrigerator room, 22: Warm room, 31: Liquid crystal panel, 32: Operation part, 33: Display part, 37A, 37B: Cooler, 41, 42: Circulation fan, 45: Heating means , 46: compressor, 47A: condenser, 47B: condenser fan, 48A, 48B: expansion valve, 49A, 49B, 71: electromagnetic valve, 55: cooling means, 60: control unit, 61: storage unit, 61A, 61B: Temperature detection means, A1: First temperature difference, A2: Second temperature difference, TA: Set temperature

Claims (2)

A refrigerating room, a refrigerating room, a cooling means for cooling the refrigerating room and the refrigerating room, a heating means for heating the refrigerating room, and both the refrigerating room and the refrigerating room as the cooling means. And a control means for performing a one-chamber heating operation in which the cooling means cools the refrigerator compartment and the heating means heats the refrigerator compartment. A refrigeration apparatus,
The control means controls the cooling means so that the temperature of the refrigerator compartment is within a first temperature difference range with respect to a set temperature during the both-chamber cooling operation, and during the one-chamber heating operation, A refrigeration apparatus for controlling the cooling means such that the temperature of the refrigeration chamber falls within a second temperature difference range different from the first temperature difference with respect to the set temperature. The refrigeration / heating apparatus according to claim 1, wherein the second temperature difference is smaller than the first temperature difference.

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