JP2017187211A - Heat pump type cooling/heating device and control method of heat pump type cooling/heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform cooling and heating in a box with a single device to widen a temperature range to automatically perform temperature control in the box.SOLUTION: A heat pump type cooling/heating device 1 is configured to, in an automatic operation mode, when a temperature in a box is equal to or more than a setting temperature range, perform cooling operation; when the temperature in the box is equal to or less than the setting temperature range, perform heating operation; and continuously switch between the heating operation and the cooling operation. Also, in the heat pump type cooling/heating device 1, a unit cooler 300 is an apparatus for cold storage within a first temperature range, and heat pump type refrigeration machine 200 is an apparatus for refrigeration within a second temperature range lower than the first temperature range.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a heat pump type cooling and heating apparatus and a control method for the heat pump type cooling and heating apparatus.

  The general refrigeration equipment introduced in the market is equipment that cools the stored items such as food, agricultural products, and industrial products to an arbitrary temperature and temporarily stores them. This refrigeration facility is dedicated to cooling. For example, since it is exclusively for cooling, it is necessary to move the object inside to another place when it is desired to warm it, and depending on the item, it may hurt (for example, temperature failure), and time is wasted and troublesome. Further, in the conventional refrigeration equipment, control is performed such that the operation is stopped when the set temperature is reached (see, for example, Patent Document 1).

JP 2013-195047 A

  As in Literature 1, when the set temperature is reached, simply stopping the operation causes the outside air temperature to drop, further reducing the temperature inside the cabinet, and depending on the item, there may be a case where it hurts (for example, Temperature failure). However, the interior cannot be heated. For this reason, an apparatus capable of expanding the temperature range, for example, capable of automatically performing temperature control is desired.

  It is an object of the present invention to perform cooling and heating in a warehouse with a single device, and extend the temperature range to, for example, 0 ° C. to 30 ° C. to automatically control the temperature in the warehouse.

In order to achieve the above object, a heat pump type cooling and heating apparatus according to the first aspect of the present invention comprises:
A unit cooler installed in the cabinet;
A heat pump refrigerator installed outside the cabinet;
A control unit for controlling heating and cooling;
With
The controller continuously switches between the heating operation and the cooling operation according to the difference between the temperature in the warehouse and the set temperature.

The unit cooler is a device for cooling in the first temperature range,
The heat pump refrigerator may be a refrigeration device having a second temperature range lower than the first temperature range.

A compressor configured in the heat pump refrigerator and compressing the refrigerant;
An outdoor heat exchanger configured in the heat pump refrigerator and connected to the compressor via a first conduit;
An expansion valve configured in the heat pump refrigerator and connected to the outdoor heat exchanger via a second conduit;
An indoor heat exchanger configured in the unit cooler and connected to the expansion valve via a third conduit;
You may make it provide.

A four-way valve having a first port connected to the compressor, a second port connected to an accumulator, a third port connected to the indoor heat exchanger, and a fourth port connected to the first conduit;
With
The controller may further control connection states of the first, second, third, and fourth ports of the four-way valve.

In order to achieve the above object, a control method of the heat pump type cooling and heating apparatus according to the second aspect of the present invention includes:
In a heat pump type cooling and heating device having a unit cooler installed inside the warehouse and a heat pump type refrigerator installed outside the warehouse,
The heating operation and the cooling operation are continuously switched according to the difference between the internal temperature and the set temperature.

  According to the present invention, the temperature range can be expanded and the temperature in the chamber can be automatically controlled by cooling and heating the chamber with a single device.

It is a figure which shows schematic structure of the heat pump type cooling and heating apparatus which concerns on embodiment of this invention. It is a figure which shows the detailed structure of the heat pump type cooling and heating apparatus which concerns on embodiment of this invention. It is a figure which shows the structure of the control apparatus which comprises a heat pump type cooling and heating apparatus. It is a figure for demonstrating the cooling operation in the automatic operation mode of a heat pump type cooling and heating apparatus. It is a figure for demonstrating the heating operation in the automatic operation mode of a heat pump type cooling and heating apparatus. It is a flowchart for demonstrating the automatic operation mode of a heat pump type cooling and heating apparatus. It is the schematic diagram which showed an example which temperature-controls using the model of a heat pump type cooling and heating apparatus.

  Hereinafter, the control method of the heat pump type cooling and heating apparatus and the heat pump type cooling and heating apparatus according to embodiments of the present invention will be described with reference to the drawings. This embodiment demonstrates the example of the heat pump type cooling and heating apparatus applied to the store | warehouse | chamber which is the space for cultivating a plant. In the drawings, the same or corresponding parts are denoted by the same reference numerals.

  FIG. 1 is a diagram showing a schematic configuration of a heat pump type cooling and heating apparatus 1. As shown in FIG. 1, the heat pump cooling and heating device 1 includes a control device 100, a heat pump refrigerator 200, a unit cooler 300, and a unit cooler 350. The unit cooler 300 and the unit cooler 350 are installed in a warehouse in which goods are stored. The heat pump refrigerator 200, the unit cooler 300, and the unit cooler 350 are connected by a pipe line. The control device 100 and the heat pump refrigerator 200 are connected by a signal line. The unit cooler 300 and the unit cooler 350 are refrigeration devices in a first temperature range, and the heat pump refrigerator 200 is a refrigeration device in a second temperature range lower than the first temperature range.

  FIG. 2 is a diagram showing a detailed configuration of the heat pump type cooling and heating apparatus 1. In FIG. 2, the unit cooler 350 is omitted, but the unit cooler 350 has the same configuration as the unit cooler 300.

  The heat pump refrigerator 200 includes a control circuit 5, an accumulator 10, a compressor 20, a four-way valve 30, an outdoor heat exchanger 40, and an expansion valve 50. The unit cooler 300 includes an indoor heat exchanger 60 and a blower 62.

  The accumulator 10 is for preventing liquid refrigerant from being sucked into the compressor 20. The accumulator 10 has a function of separating the liquid refrigerant and the gaseous refrigerant and supplying only the gaseous refrigerant to the compressor 20. The compressor 20 has a function of compressing the refrigerant, and includes an electric compressor or the like.

  The four-way valve 30 includes a first port P1 connected to the compressor 20, a second port P2 connected to the accumulator 10, a third port P3 connected to the indoor heat exchanger 60, and the outdoor heat exchanger 40. And a fourth port P4 connected to the. In the automatic operation mode in which the cooling operation and the heating operation are appropriately performed, the connection state from the first port P1 to the fourth port P4 in the four-way valve 30 is appropriately changed.

  The outdoor heat exchanger 40 exchanges heat between the refrigerant and the outdoor air. That is, the heat of the high-temperature refrigerant is radiated during the cooling operation. Further, during the heating operation, the outside air temperature is absorbed by the refrigerant. In the expansion valve 50, the temperature decreases as the refrigerant diffuses and expands.

  The indoor heat exchanger 60 exchanges heat between the refrigerant and the room air. The indoor heat exchanger 60 cools indoor air with a low-temperature refrigerant during the cooling operation, and warms indoor air with the high-temperature refrigerant during the heating operation.

  The outdoor heat exchanger 40 and the expansion valve 50 are connected via a second conduit 92. The expansion valve 50 and the indoor heat exchanger 60 are connected via a third conduit 93. The fourth port P4 of the four-way valve 30 and the outdoor heat exchanger 40 are connected via a first conduit 91. The third port P3 of the four-way valve 30 and the indoor heat exchanger 60 are connected via a fourth pipe 97.

  The control device 100 controls the heat pump refrigerator 200 and the unit cooler 300 based on temperature information acquired from the temperature sensors provided in the interior, the heat pump refrigerator 200, and the unit cooler 300. As illustrated in FIG. 3, the control device 100 includes a control unit 110, a storage unit 120, an input unit 130, a display unit 140, and a bus 150.

  The control unit 110 includes a RAM (Random Access Memory) and a CPU (Central Processing Unit). The RAM functions as a work area for the CPU. The CPU changes the connection state of the ports in the four-way valve 30 by reading the control program stored in the storage unit 120 into the RAM and executing it.

  The storage unit 120 includes an external storage device and stores an allowable temperature setting range and the like. The storage unit 120 also stores a control program for the heat pump type cooling and heating device 1. The input unit 130 includes a switch, a keyboard, a touch panel, and the like. The input unit 130 acquires an operation mode, an operating temperature, and the like set by the user. The display unit 140 includes an LED lamp, a liquid crystal display, and the like. The display unit 140 displays the operating mode in operation, the temperature set by the user, the temperature measured by the temperature sensor, and the like. The bus 150 connects the control unit 110, the storage unit 120, the input unit 130, and the display unit 140.

  Next, operation | movement of the heat pump type cooling and heating apparatus 1 which has the above structure is demonstrated. The heat pump type cooling / warming device 1 will be described with respect to the operation in the automatic operation mode in which the cooling operation and the heating operation are continuously switched according to the internal temperature and the temperature set by the user from the control device 100.

  The cooling operation process in the automatic operation mode performed by the heat pump type cooling and heating device 1 will be described. FIG. 4 is a diagram illustrating the refrigerant flow during the cooling operation in the automatic operation mode. The controller 110 continues operating the blower 62 during the cooling operation process.

  At this time, as shown in FIG. 4, the control unit 110 includes a first port P1 and a fourth port P4 connected to each other inside the four-way valve 30 and a second port P2 and a third port P3 connected to each other. Put it in a state.

  As a result, the refrigerant is compressed by the compressor 20, the four-way valve 30, the first pipe 91, the outdoor heat exchanger 40, the second pipe 92, the expansion valve 50, the third pipe 93, the indoor heat exchanger 60, and the fourth. It circulates in order of the pipe line 97-> four-way valve 30-> accumulator 10-> compressor 20.

  Next, the heating operation process in the automatic operation mode performed by the heat pump cooling and heating device 1 will be described. FIG. 5 is a diagram showing the refrigerant flow during the heating operation in the automatic operation mode. The controller 110 continues operating the blower 62 during the heating operation process.

  At this time, as shown in FIG. 5, the control unit 110 is connected to the four-way valve 30 with the first port P1 and the third port P3 connected and the second port P2 and the fourth port P4 connected. Set to 2 state.

  As a result, the refrigerant flows from the compressor 20 → the four-way valve 30 → the fourth pipe 97 → the indoor heat exchanger 60 → the third pipe 93 → the expansion valve 50 → the second pipe 92 → the outdoor heat exchanger 40 → first. It circulates in order of the pipe line 91-> four-way valve 30-> accumulator 10-> compressor 20.

  FIG. 6 is a flowchart showing the operation of the heat pump type cooling and heating device 1 in the automatic operation mode. When the operation in the automatic operation mode is started, the controller 110 determines that the temperature acquired from the temperature sensor provided in the warehouse is equal to or higher than the allowable set temperature range in which the temperature is centered on the set temperature input by the user. It is determined whether or not (step S11).

  When the internal temperature is equal to or higher than the set temperature range (step S11: Yes), the control unit 110 operates the compressor 20 via the control circuit 5 to perform the cooling operation (step S12). Specifically, as described above, the control unit 110 is in the first state in which the first port P1 and the fourth port P4 are connected and the second port P2 and the third port P3 are connected inside the four-way valve 30. To. As a result, the refrigerant is compressed by the compressor 20, the four-way valve 30, the first pipe 91, the outdoor heat exchanger 40, the second pipe 92, the expansion valve 50, the third pipe 93, the indoor heat exchanger 60, and the fourth. It circulates in order of the pipe line 97-> four-way valve 30-> accumulator 10-> compressor 20.

  At this time, in the outdoor heat exchanger 40, the refrigerant is cooled by exchanging heat between the refrigerant compressed to high temperature and high pressure by the compressor 20 and the outside air. The expansion valve 50 is further cooled when the refrigerant cooled in the outdoor heat exchanger 40 is diffused and expanded. In the indoor heat exchanger 60, the air in the warehouse is cooled by exchanging heat between the air in the warehouse and the cooled refrigerant.

  On the other hand, when the temperature in the storage is not equal to or higher than the set temperature range (step S11: No), the control unit 110 uses the temperature acquired from the temperature sensor provided in the storage centered on the set temperature input by the user. It is determined whether it is below the allowable set temperature range that is the temperature range to be performed (step S13).

  When the inside temperature is equal to or lower than the set temperature range (step S13: Yes), the control unit 110 operates the compressor 20 via the control circuit 5 to perform the heating operation (step S14). Specifically, as described above, the control unit 110 includes the second port 30 in which the first port P1 and the third port P3 are connected and the second port P2 and the fourth port P4 are connected. Put it in a state. As a result, the refrigerant flows from the compressor 20 → the four-way valve 30 → the fourth pipe 97 → the indoor heat exchanger 60 → the third pipe 93 → the expansion valve 50 → the second pipe 92 → the outdoor heat exchanger 40 → first. It circulates in order of the pipe line 91-> four-way valve 30-> accumulator 10-> compressor 20.

  At this time, in the indoor heat exchanger 60, the air in the warehouse is warmed by heat exchange between the high-temperature and high-pressure refrigerant compressed by the compressor 20 and the air in the warehouse. In the expansion valve 50, the refrigerant radiated by the indoor heat exchanger 60 is diffused and expanded. In the outdoor heat exchanger 40, heat exchange is performed between the diffused and expanded refrigerant and the outside air.

  After the cooling operation is performed by operating the compressor 20 in step S12, or after the heating operation is performed by operating the compressor 20 in step S13, the internal temperature is again equal to or higher than the set temperature range. The operation after the determination of whether or not (step S11) is performed.

  Moreover, also when the temperature in a store | warehouse | chamber is not below a setting temperature range (step S13; No), ie, when the temperature in a store | warehouse | chamber does not exist in a setting temperature range, is the temperature in a store | warehouse | chamber again more than a setting temperature range? The operation after the determination of whether or not (step S11) is performed.

FIG. 7 is a schematic diagram showing an example of temperature management using a model of a heat pump type cooling and heating device. In the schematic diagram shown in FIG. 7, rooms 400, 401, and 402 are prepared as temperature management spaces. The rooms 400, 401, and 402 are about 26 m ² of space of 5.4 m long and 4.8 m wide, respectively. Room 400 temporarily stores rice, and rooms 401 and 402 temporarily store flower buds. In each of the rooms 400, 401, and 402, the heat pump type cooling and heating device 1 is installed, and the temperature management suitable for the stored items is performed by the automatic operation mode.

  As described above, in the automatic operation mode, the heat pump type cooling / warming device 1 performs the cooling operation if the internal temperature is equal to or higher than the set temperature range, and warms if the internal temperature is equal to or lower than the set temperature range. Operate and continuously switch between heating operation and cooling operation. Thus, as in the past, when the set temperature is reached, the operation is simply stopped, so that the outside air temperature is prevented from lowering, thereby further preventing the temperature inside the cabinet from being lowered, and the temperature control is automatically performed. Can be done automatically.

  Moreover, in the heat pump type cooling and heating apparatus 1, the unit cooler 300 is a refrigeration device used for air conditioning in the first temperature range, and the heat pump type refrigerator 200 is used for air conditioning in the second temperature range. Equipment for freezing. Thereby, the temperature range which can be cooled and heated can be expanded. According to the inventor's experiment, it was confirmed that what was conventionally in the range of 18 ° C. to 30 ° C. expands to the range of 3 ° C. to 30 ° C. Compared to the case where both the heat pump refrigerator and the unit cooler are refrigeration equipment and the temperature range is expanded by combining the heat pump refrigerator and the unit cooler both refrigeration equipment. Thus, cost reduction can be achieved.

  In the above description, the case where the control device 100, the heat pump refrigerator 200, and the unit coolers 300 and 350 are mounted on separate devices has been described. However, the scope of the present invention need not be limited to this. For example, only the input unit 130 and the display unit 140 may be mounted on the control device 100, and the control unit 110 and the storage unit 120 may be mounted in the heat pump refrigerator 200 or the unit coolers 300 and 350. Moreover, you may make it mount the control apparatus 100 and the heat pump refrigerator 200 in the same apparatus.

  Moreover, the temperature information and control signal transmitted / received between the control apparatus 100, the heat pump refrigerator 200, and the unit cooler 300 may be transmitted / received wirelessly, and may be transmitted / received by wire.

DESCRIPTION OF SYMBOLS 1 ... Heat pump type cooling and heating apparatus, 5 ... Control circuit, 10 ... Accumulator, 20 ... Compressor, 30 ... Four-way valve, 40 ... Outdoor heat exchanger, 50 ... Expansion valve, 60 ... Indoor heat exchanger, 62 ... Blower 91 ... 1st pipe line, 92 ... 2nd pipe line, 93 ... 3rd pipe line, 97 ... 4th pipe line, 100 ... Control apparatus, 110 ... Control part, 120 ... Storage part, 130 ... Input part, 140 ... Display unit, 150 ... Bath, 200 ... Heat pump refrigerator, 300, 350 ... Unit cooler, 400, 401, 402 ... Room

Claims (5)

A unit cooler installed in the cabinet;
A heat pump refrigerator installed outside the cabinet;
A control unit for controlling heating and cooling;
With
The said control part is a heat pump type cooling and heating apparatus which switches a heating operation and a cooling operation continuously according to the difference between the temperature in the said store | warehouse | chamber, and preset temperature. The unit cooler is a device for cooling in the first temperature range,
The heat pump refrigerator is an apparatus for freezing in a second temperature range lower than the first temperature range.
The heat pump type cooling and heating apparatus according to claim 1. A compressor configured in the heat pump refrigerator and compressing the refrigerant;
An outdoor heat exchanger configured in the heat pump refrigerator and connected to the compressor via a first conduit;
An expansion valve configured in the heat pump refrigerator and connected to the outdoor heat exchanger via a second conduit;
An indoor heat exchanger configured in the unit cooler and connected to the expansion valve via a third conduit;
Comprising
The heat pump type cooling and heating apparatus according to claim 1 or 2. A four-way valve having a first port connected to the compressor, a second port connected to an accumulator, a third port connected to the indoor heat exchanger, and a fourth port connected to the first conduit;
With
The control unit further controls connection states of the first, second, third, and fourth ports of the four-way valve,
The heat pump type cooling and heating apparatus according to claim 3. In a heat pump type cooling and heating device having a unit cooler installed inside the warehouse and a heat pump type refrigerator installed outside the warehouse,
According to the difference between the internal temperature and the set temperature, the heating operation and the cooling operation are continuously switched.
Control method of heat pump type cooling and heating device.

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