JP2011113480A - Cooling and heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling and heating device causing no damage to stored commodities while reducing power consumption. <P>SOLUTION: The cooling and heating device includes: a cooling path constructed by connecting a compressor 21, an exterior heat exchanger 22, a first capillary tube 23, and an interior heat exchanger 24 mutually; and a controller 70 driving the compressor 21 to cool an interior atmosphere of a cooling chamber when an interior temperature of the cooling chamber becomes a cooling-on temperature or higher, or when the interior temperature becomes a cooling-off temperature or lower, stopping driving of the compressor 21 and driving a left interior heater 65c arranged inside a heating chamber by PID control so that the interior temperature becomes a predetermined heating target temperature. When the compressor 21 is driven, driving of the left interior heater 65c is stopped. When driving of the compressor 21 is stopped, the left interior heater 65c is driven. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a cooling and heating device, and more particularly, to a cooling and heating device that is applied to, for example, a vending machine and that cools or heats the internal atmosphere of a product container defined in a vending machine body. Is.

  2. Description of the Related Art Conventionally, as a cooling and heating device applied to, for example, a vending machine, a device including a refrigerant circuit having a function as a heat pump and a controller is known. As such a refrigerant circuit, a cooling path and a heating path are generally provided.

  The cooling path is configured by sequentially connecting an evaporator, a compressor, a condenser, and an expansion mechanism through a refrigerant pipe. The evaporator is disposed inside the commodity storage of the vending machine. This evaporator cools the internal air (internal atmosphere) of the product storage box by the supplied refrigerant passing through a predetermined flow path and evaporating.

  The compressor is disposed in the machine room inside the vending machine main body and outside the product container. The compressor sucks the refrigerant evaporated by the evaporator and compresses the sucked refrigerant into a high temperature and high pressure state. Are discharged. The condenser is disposed in the machine room in the same manner as the compressor, introduces the refrigerant compressed by the compressor through the refrigerant pipe, and heats the ambient air by condensing the introduced refrigerant, that is, into the ambient air. It dissipates heat. The expansion mechanism is disposed in the machine room in the same manner as the compressor and the condenser, and decompresses the refrigerant condensed in the condenser and adiabatically expands the refrigerant.

  The heating path is a path having an internal heat exchanger. The internal heat exchanger is disposed inside the commodity storage. In more detail, it is arrange | positioned inside the goods storage container which accommodates the goods used as the heating object. This internal heat exchanger has an inlet side connected to a branch pipe branched from a refrigerant pipe connecting a compressor and a condenser constituting a cooling path, and a refrigerant pipe connecting a condenser and an expansion mechanism. An outlet side is connected to a return pipe provided in a mode of joining. Such an in-compartment heat exchanger heats the internal air of the product storage container in which the refrigerant is compressed by introducing the refrigerant compressed by the compressor through the branch pipe and condensing the introduced refrigerant.

  In such a refrigerant circuit, when the refrigerant compressed by the compressor flows in each of the cooling path and the heating path, the refrigerant flowing in the cooling path among the refrigerant compressed by the compressor reaches the condenser, and the condenser The condensed refrigerant is adiabatically expanded by the expansion mechanism and evaporated by the evaporator. The refrigerant evaporated in the evaporator is sucked by the compressor, compressed again, and circulated. As a result, the internal air of the product storage (cooler) in which the evaporator is disposed is cooled.

  On the other hand, the refrigerant flowing through the heating path among the refrigerant compressed by the compressor reaches the internal heat exchanger through the branch pipe, and condenses in the internal heat exchanger. Thereby, the internal air of the product storage (heating chamber) in which the internal heat exchanger is disposed is heated. The refrigerant condensed in the internal heat exchanger returns to the cooling path through the return pipe, is adiabatically expanded by the expansion mechanism, is evaporated by the evaporator, is sucked by the compressor, is compressed again, and is circulated.

  The controller is for controlling the driving of the compressor. When the temperature inside the product storage container in which the evaporator is disposed is equal to or higher than a predetermined cooling on temperature, or when the heat exchanger inside the The compressor is driven when the inside temperature of the installed product storage is below a predetermined heating on temperature. On the other hand, when the inside temperature of the product storage room in which the evaporator is disposed is equal to or lower than a predetermined cooling off temperature, or the inside temperature of the product storage room in which the internal heat exchanger is disposed is heated. When the temperature is equal to or higher than the off temperature, the compressor is stopped.

  In order to reduce power consumption, a cooling and heating apparatus is known in which a priority room is determined from among a cooling room and a heating room, and the drive of the compressor is controlled in accordance with the internal temperature of the priority room. ing.

  In such a cooling and heating apparatus, for example, when the heating chamber is set as the priority chamber, the controller can compress the compressor regardless of the temperature in the cooling chamber when the temperature in the heating chamber is equal to or lower than the heating-on temperature. To heat the internal air of the heating chamber. Thereafter, when the internal temperature of the heating chamber becomes equal to or higher than the heating off temperature, the driving of the compressor is stopped regardless of the internal temperature of the cooling chamber (see, for example, Patent Document 1).

JP 2006-011604 A

  However, in the cooling and heating apparatus proposed in Patent Document 1 as described above, when the heating chamber is a priority chamber, the compressor is driven according to the temperature in the heating chamber regardless of the temperature in the cooling chamber. In order to stop driving, the internal air of the refrigerator may be excessively cooled (overcooling), or the internal temperature of the refrigerator may greatly exceed the cooling on temperature, causing damage to the stored products. There is.

  An object of this invention is to provide the cooling heating apparatus which does not have a possibility of damaging the goods accommodated, aiming at reduction of power consumption in view of the said situation.

  In order to achieve the above object, a cooling and heating apparatus according to claim 1 of the present invention includes a compressor that compresses a refrigerant, a condenser that condenses the refrigerant compressed by the compressor, and a condenser that condenses the refrigerant. A cooling path configured by sequentially connecting an expansion mechanism for adiabatically expanding the refrigerant and an evaporator for evaporating the refrigerant adiabatically expanded by the expansion mechanism, and condensing by introducing a part of the refrigerant compressed by the compressor A heating path configured to return the refrigerant condensed in the internal heat exchanger to the cooling path, and a cooling chamber temperature of the cooling chamber in which the evaporator is disposed in advance. When the temperature is equal to or higher than a predetermined cooling on temperature, the compressor is driven to cool the internal atmosphere of the cooling chamber, while the cooling chamber temperature is lower than the cooling on temperature. If below the temperature, Cooling control means for stopping the driving of the compressor and the heating chamber temperature of the heating chamber in which the internal heat exchanger is arranged are arranged inside the heating chamber so as to become a predetermined heating target temperature. And a heating control unit for driving the heating unit by PID control. When the compressor is driven by the cooling control unit, the heating control unit stops driving the heating unit. On the other hand, when the driving of the compressor by the cooling means is stopped, the heating means is driven.

  According to a second aspect of the present invention, there is provided the cooling and heating apparatus according to the first aspect, wherein the heating control means indicates that the door body of the casing in which the heating chamber is housed is opened. If detected by the above, the driving of the heating means is stopped.

  According to the cooling and heating apparatus of the present invention, the heating control means stops the driving of the heating means when the compressor is driven by the cooling control means, so the internal heat exchanger disposed in the heating chamber By condensing the refrigerant passing through, the internal atmosphere can be supplementarily heated. When the driving of the compressor by the cooling means is stopped, the heating means is driven by PID control, so that the room temperature of the heating chamber can be heated to approximate the heating target temperature. Thereby, power consumption can be reduced. In addition, since the heating means is driven by PID control, it is not necessary to drive the compressor in response to the heating request, thereby excessively cooling the internal air of the cooling chamber and damaging the products in the cooling chamber due to freezing or the like. There is no fear. Therefore, there is an effect that there is no possibility of damaging the stored product while reducing power consumption.

FIG. 1 is a cross-sectional view showing a case where an internal structure of a vending machine to which a cooling and heating apparatus according to an embodiment of the present invention is applied is viewed from the front. FIG. 2 shows the internal structure of the vending machine shown in FIG. 1, and is a cross-sectional side view of the right commodity storage. FIG. 3 is a conceptual diagram conceptually showing the cooling and heating apparatus according to the embodiment of the present invention. FIG. 4 is a block diagram schematically showing a control system of the cooling and heating apparatus according to the present embodiment. FIG. 5 is a conceptual diagram conceptually showing the flow of the refrigerant in the refrigerant circuit when the CCC operation is performed. FIG. 6 is a conceptual diagram conceptually showing the flow of the refrigerant in the refrigerant circuit when performing the HCC operation. FIG. 7 is a flowchart showing the processing contents of the cooling operation control processing performed by the controller. FIG. 8 is a flowchart showing the processing contents of the heating operation control process performed by the controller. FIG. 9 is a flowchart showing the processing contents of the heating operation stop processing performed by the controller. FIG. 10 is a flowchart showing the processing contents of another heating operation stop process performed by the controller.

  Exemplary embodiments of a cooling and heating apparatus according to the present invention will be described below in detail with reference to the accompanying drawings.

  FIG. 1 is a cross-sectional view showing a case where an internal structure of a vending machine to which a cooling and heating apparatus according to an embodiment of the present invention is applied is viewed from the front. The vending machine illustrated here includes a main body cabinet 1.

  The main body cabinet 1 has a rectangular shape with an open front surface. The main body cabinet 1 is provided with three independent commodity containers 3 partitioned by, for example, two heat insulating partition plates 2 in a side-by-side manner. This product storage 3 is for storing products such as canned beverages and beverages containing plastic bottles while maintaining a desired temperature, and has a heat insulating structure.

  FIG. 2 shows the internal structure of the vending machine shown in FIG. 1 and is a cross-sectional side view of the right product storage case 3. Here, the internal structure of the right product storage (hereinafter also referred to as right storage) 3a is shown, but the central product storage (hereinafter also referred to as intermediate storage) 3b and the left product storage (hereinafter referred to as right storage) 3a. The internal structure of 3c is also substantially the same as that of the right warehouse 3a. In the present specification, the right side indicates the right side when the vending machine is viewed from the front, and the left side indicates the left side when the vending machine is viewed from the front.

  As shown in FIG. 2, an outer door 4 and an inner door 5 are provided on the front surface of the main body cabinet 1. The outer door 4 is for opening and closing the front opening of the main body cabinet 1, and the inner door 5 is for opening and closing the front surface of the commodity storage 3. The inner door 5 is divided into upper and lower parts, and the upper door 5a opens and closes when a product is replenished.

  The product storage 3 is provided with a product storage rack 6, a carry-out mechanism 7 and a carry-out shooter 8. The commodity storage rack 6 is for storing commodities in a manner arranged in the vertical direction. The carry-out mechanism 7 is provided at the lower part of the product storage rack 6 and is used to carry out the products at the bottom of the product group stored in the product storage rack 6 one by one. The carry-out shooter 8 is for guiding the product carried out from the carry-out mechanism 7 to the product take-out port 4 a provided in the outer door 4.

  FIG. 3 is a conceptual diagram conceptually showing the cooling and heating apparatus according to the embodiment of the present invention. The cooling and heating apparatus exemplified here includes a main path 20, a branch path 30, a heat radiation path 40, and a return path 50, and includes a refrigerant circuit 10 in which a refrigerant is sealed.

  The main path 20 is configured by sequentially connecting a compressor 21, an external heat exchanger 22, a first capillary tube 23, and an internal heat exchanger 24 through a refrigerant pipe 25.

  The compressor 21 is disposed in the machine room 9 as shown in FIG. The machine room 9 is a room inside the main body cabinet 1, partitioned from the product storage 3 and below the product storage 3. The compressor 21 sucks the refrigerant through the suction port, compresses the sucked refrigerant to be in a high-temperature and high-pressure state (high-temperature and high-pressure refrigerant), and discharges it from the discharge port.

  As shown in FIG. 2, the external heat exchanger 22 is disposed in the machine room 9 similarly to the compressor 21. This external heat exchanger 22 condenses the refrigerant that passes therethrough. More specifically, the refrigerant compressed by the compressor 21 and discharged from the discharge port and sent out through the refrigerant pipe 25 is condensed by exchanging heat with ambient air.

  The refrigerant pipe 25 connecting the external heat exchanger 22 and the compressor 21 is provided with a high-pressure side electromagnetic valve 261. The high-pressure side electromagnetic valve 261 is a valve body that can be opened and closed. When the opening command is given from the controller 70 to be described later, the high-pressure side electromagnetic valve 261 opens and allows the passage of the refrigerant, while when the closing command is given. It closes and regulates the passage of refrigerant.

  As shown in FIG. 2, the first capillary tube 23 is disposed in the machine room 9 similarly to the compressor 21 and the external heat exchanger 22. The first capillary tube 23 is for adiabatic expansion by reducing the pressure of the refrigerant passing therethrough.

  A plurality of (three in the illustrated example) heat exchangers 24 in the cabinet are provided, which are disposed in the lower interior of each commodity storage 3 and on the front side of the rear duct D (see FIG. 2). is there. The refrigerant pipe 25 connecting the internal heat exchanger 24 and the first capillary tube 23 is branched into three by a distributor 27 disposed in the middle thereof, and the internal heat disposed in the right warehouse 3a. On the inlet side of an exchanger (hereinafter also referred to as a right-side heat exchanger) 24a, on the inlet side of an internal heat exchanger (hereinafter also referred to as an inner-center heat exchanger) 24b disposed in the inner warehouse 3b Are connected to the inlet side of an in-compartment heat exchanger (hereinafter also referred to as a left-inside heat exchanger) 24c disposed inside the left-compartment 3c.

  Moreover, in this refrigerant | coolant piping 25, the low pressure side solenoid valves 262,263, on the way from the distributor 27 to each of the right internal heat exchanger 24a, the central internal heat exchanger 24b, and the left internal heat exchanger 24c. H.264 is provided. The low pressure side solenoid valves 262, 263, and 264 are openable and closable valve elements, which are opened when the opening command is given from the controller 70 and allow passage of the refrigerant, while when the closing command is given. Is closed to restrict the passage of refrigerant.

  Refrigerant piping 25 connected to the outlet side of the internal heat exchanger 24b and the left internal heat exchanger 24c merges at the first junction P1 on the way, and further to the outlet side of the right internal heat exchanger 24a. The connected refrigerant pipe 25 joins at the second joining point P <b> 2 and is connected to the compressor 21 via the accumulator 28. Here, the accumulator 28 is for storing the liquid-phase refrigerant and allowing the gas-phase refrigerant to pass through when the refrigerant passing therethrough is a gas-liquid mixed refrigerant.

  In the refrigerant pipe 25 connected to the outlet side of the internal heat exchanger 24b and the left internal heat exchanger 24c, return solenoid valves 265 and 266 are arranged upstream of the first junction P1, respectively. is there. These return solenoid valves 265 and 266 are valve bodies that can be opened and closed. When the opening command is given from the controller 70, the feedback solenoid valves 265 and 266 are opened to allow passage of the refrigerant, whereas when the closing command is given. It closes and regulates the passage of refrigerant.

  The branch path 30 branches from a high-pressure side branch point P3 in the middle of the path between the compressor 21 and the high-pressure side electromagnetic valve 261, and further branches in the middle, one of which is on the inlet side of the internal heat exchanger 24b. The other of the refrigerant pipes 25 is constituted by a branch pipe 31 that merges with the refrigerant pipe 25 on the inlet side of the left side heat exchanger 24c. This branch path 30 is a path for introducing the refrigerant (high-pressure refrigerant) compressed by the compressor 21. Here, in the refrigerant pipes 25 on the inlet side of the internal heat exchanger 24b and the left internal heat exchanger 24c, a path upstream from the junction with each branch pipe 31 (each branch path 30), that is, Check valves 267 and 268 are provided in a path between each junction and the low-pressure side solenoid valves 263 and 264 located upstream thereof.

  In the branch path 30, branch solenoid valves 321 and 322 are provided on the downstream side of the branch point, respectively. The branch solenoid valves 321 and 322 are valve bodies that can be opened and closed. When the opening command is given from the controller 70, the branch solenoid valves 321 and 322 are opened to allow the passage of the refrigerant. Thus, the passage of the refrigerant is restricted.

  That is, when the refrigerant compressed by the compressor 21 is supplied through the branch path 30, the inner heat exchanger 24 b and the left inner heat exchanger 24 c condense the refrigerant passing therethrough and become a target product. The internal air of the storage 3 (the central storage 3b and the left storage 3c) is heated.

  The heat radiation path 40 is branched in the middle of each of the refrigerant pipes 25 connected to the outlet side of the inner heat exchanger 24b and the left heat exchanger 24c, and merges at the third junction P4. The heat dissipating pipe 42 is connected to the inlet side of the gas cooler 41 disposed in a manner adjacent to the exchanger 22. The heat dissipation path 40 is for supplying the gas cooler 41 with the refrigerant condensed in at least one of the internal heat exchanger 24b and the left internal heat exchanger 24c. In the gas cooler 41 to which the refrigerant is supplied through the heat radiation path 40, heat exchange is performed between the refrigerant and the ambient air, and the refrigerant radiates heat. That is, the heat radiation path 40 introduces the refrigerant condensed in the internal heat exchanger 24 and supplies the refrigerant to the gas cooler 41, and the gas cooler 41 exchanges heat with ambient air to dissipate heat.

  The third junction from the branch point of the refrigerant pipe 25 connected to the outlet side of the heat exchanger 24b and the left heat exchanger 24c in the middle of the heat radiation pipe 42 constituting the heat radiation path 40. On the way to P4, check valves 431 and 432 are provided, respectively.

  The return path 50 is connected to the outlet side of the gas cooler 41, and is connected to the refrigerant pipe 25 constituting the main path 20, that is, the fourth junction P5 of the refrigerant pipe 25 between the first capillary tube 23 and the distributor 27. It is the path | route comprised by the return piping 51 to do.

  A second capillary tube 52 is provided in the middle of the return pipe 51 constituting the return path 50. The second capillary tube 52 is for adiabatic expansion by reducing the pressure of the refrigerant passing therethrough.

  In the refrigerant circuit 10, three strainers, that is, a first strainer S1, a second strainer S2, and a third strainer S3 are arranged. The first strainer S <b> 1 is disposed in the refrigerant pipe 25 between the external heat exchanger 22 and the first capillary tube 23 in the main path 20. The first strainer S1 has a desiccant for removing moisture and a filter for removing foreign matter, and removes moisture from the refrigerant passing through the refrigerant pipe 25 and removes foreign matter. It is the removal member to perform.

  The second strainer S <b> 2 is disposed in the return pipe 51 in the return path 50, that is, the return pipe 51 between the gas cooler 41 and the second capillary tube 52. The second strainer S2 has a filter for removing foreign matter, and is a foreign matter removing member that only removes foreign matter from the refrigerant passing through the refrigerant pipe 25.

  The third strainer S3 is disposed in the refrigerant pipe 25 on the discharge port side of the compressor 21 in the main path 20. The third strainer S3 has a filter for removing foreign matter, and is a foreign matter removing member that removes foreign matter from the refrigerant passing through the refrigerant pipe 25. In the present embodiment, the third strainer S3 is also disposed in the refrigerant pipe 25 connected to the discharge port side of the compressor 21, but such a strainer is not essential, and the application conditions of the cooling and heating device, etc. It may be installed as appropriate according to

  FIG. 4 is a block diagram schematically showing a control system of the cooling and heating apparatus according to the present embodiment. As shown in FIG. 4, the cooling and heating device includes an input means 60, a right chamber temperature sensor 61, a middle chamber temperature sensor 62, a left chamber temperature sensor 63, a middle chamber heater 65b, a left chamber heater 65c, An outer door detection switch SW and a controller 70 are provided.

  The input means 60 is for performing various setting inputs such as a remote controller, for example, and the information set and input here is given to the controller 70.

  The right-chamber interior temperature sensor 61 is a detection means that is disposed inside the right-hand warehouse 3a and detects the internal temperature (room temperature) of the right warehouse 3a. The inside temperature sensor 62 is a detection means that is disposed inside the inside 3b and detects the inside temperature (indoor temperature) of the inside 3b. The left warehouse temperature sensor 63 is disposed in the left warehouse 3c, and is a detection means for detecting the temperature (indoor temperature) of the left warehouse 3c. Information regarding the temperatures detected by the right chamber temperature sensor 61, the inner chamber temperature sensor 62, and the left chamber temperature sensor 63 is provided to the controller 70 as a temperature signal.

  The inner warehouse heater 65b is disposed inside the inner warehouse 3b. More specifically, the inner warehouse heater 65b is disposed at the bottom of the inner warehouse 3b and in the vicinity of the internal fan. This inner-compartment heater 65b is a heating means that is energized when driven and heats the internal air of the inner-compartment 3b. The left warehouse heater 65c is disposed inside the left warehouse 3c, more specifically, at the bottom of the left warehouse 3c and in the vicinity of the internal fan. This left-side warehouse heater 65c is a heating means that is energized when driven and heats the internal air of the left-side warehouse 3c.

  The outer door detection switch SW detects the opening / closing of the outer door 4 and is turned on when the outer door 4 is opened, and gives the effect to the controller 70 while the outer door 4 is closed. Is turned off.

  The controller 70 comprehensively controls the operation of each part of the refrigerant circuit 10 in accordance with programs and data stored in the memory 80. The input processing unit 71, the electromagnetic valve drive processing unit 72, and the cooling operation control unit 73 are controlled. And the heating operation control part 74 is provided and comprised.

  Here, various information is stored in the memory 80, and cooling temperature information and heating temperature information are stored as characteristic features of the present invention. The cooling temperature information is for determining the target cooling temperature range of the product storage (cooling) to be cooled, and includes the cooling on temperature as the upper limit and the cooling off temperature as the lower limit. ing. The heating temperature information is for determining a heating target temperature that is a target of the commodity storage (heating chamber) to be heated.

  The input processing section 71 is for inputting information such as commands and data given from the input means 60 and the internal temperature sensors 61, 62, 63. The solenoid valve drive processing unit 72 issues an open command to each solenoid valve, that is, the high pressure side solenoid valve 261, the low pressure side solenoid valves 262, 263, and 264, the feedback solenoid valves 265 and 266, and the branch solenoid valves 321 and 322, respectively. Alternatively, a close command is given to open or close them individually.

  The cooling operation control unit 73 includes a cooling temperature determination unit 731 and a compressor drive processing unit 732. The cooling temperature determination unit 731 is detected by the temperature given from the inside temperature sensors 61, 62, 63 disposed in the inside of the refrigerator (product storage) 3, that is, the inside temperature sensors 61, 62, 63. It is determined whether the internal temperature is within the target cooling temperature range. More specifically, it is determined whether or not the detected internal temperature is equal to or lower than the cooling off temperature, or whether or not the detected internal temperature is equal to or higher than the cooling on temperature. The compressor drive processing unit 732 performs a process of driving the compressor 21 at a predetermined rotational speed by giving a drive command or a drive stop command to the compressor 21.

  The heating operation control unit 74 includes a heating temperature calculation unit 741, a compressor operation determination unit 742, and a heater drive processing unit 743. The heating temperature calculation unit 741 is a temperature given from the inside temperature sensors 62 and 63 disposed in the inside of the heating cabinet (product storage) 3, that is, the inside temperature detected by the inside temperature sensors 62 and 63. Then, a deviation from the heating target temperature is obtained, and PID calculation is performed based on the deviation.

  The compressor operation determination unit 742 determines whether or not the compressor 21 is driven. More specifically, when a drive command is given from the compressor drive processing unit 732 of the cooling operation control unit 73, it is determined that the compressor 21 is driven, while the compressor drive processing unit 732 drives. When a stop command is given, it is determined that the compressor 21 has stopped driving. The heater drive processing unit 743 drives the heaters 65b and 65c in the energized state with an output corresponding to the calculation result by the heating temperature calculating unit 741, or stops the drive by setting the heaters 65b and 65c in the non-energized state. Is.

  The cooling and heating device having the above-described configuration cools or heats the product stored in the product storage 3 as follows.

  First, the case where CCC operation (operation which cools the internal air of all the goods storage 3) is performed is explained. In this case, the controller 70 given a command to perform the CCC operation through the input means 60 closes the branch solenoid valves 321 and 322 through the solenoid valve drive processing unit 72, and the high pressure side solenoid valve 261, the low pressure side solenoid valve. 262, 263, 264 and feedback solenoid valves 265, 266 are opened. As a result, the refrigerant compressed by the compressor 21 circulates as shown in FIG.

  That is, the refrigerant compressed by the compressor 21 passes through the high-pressure side electromagnetic valve 261 to be opened and reaches the external heat exchanger 22. The refrigerant that has reached the external heat exchanger 22 dissipates heat to the surrounding air (outside air) and condenses while passing through the external heat exchanger 22. The refrigerant condensed in the external heat exchanger 22 passes through the first strainer S <b> 1 to remove moisture and foreign matter, and then adiabatically expands in the first capillary tube 23.

  The refrigerant adiabatically expanded and vaporized by the first capillary tube 23 is branched into three by the distributor 27, and reaches the right internal heat exchanger 24a, the central internal heat exchanger 24b, and the left internal heat exchanger 24c. Then, each of the internal heat exchangers 24 evaporates and takes heat from the internal air of the product storage 3 to cool the internal air. The cooled internal air circulates in the interior by driving each internal blower fan (F1), whereby the products stored in each product storage 3 are cooled to the circulating internal air. The refrigerant evaporated in each internal heat exchanger 24 is gas-liquid separated by the accumulator 28, and then the gas phase portion is sucked into the compressor 21 and compressed by the compressor 21 to repeat the above-described circulation.

  Next, a case where the HCC operation (operation for heating the internal air of the left warehouse 3c and cooling the internal air of the middle warehouse 3b and the right warehouse 3a) is described. In this case, the controller 70 to which an instruction to perform the HCC operation through the input means 60 is sent to the high pressure side solenoid valve 261, the low pressure side solenoid valve 264, the feedback solenoid valve 266, the branch solenoid valve through the solenoid valve drive processing unit 72. 321 is closed, and the low pressure side solenoid valves 262 and 263, the branch solenoid valve 322, and the feedback solenoid valve 265 are opened. As a result, the refrigerant compressed by the compressor 21 circulates as shown in FIG.

  That is, the refrigerant compressed by the compressor 21 passes through the branch path 30 and reaches the left-inside heat exchanger 24c. The refrigerant that has reached the left internal heat exchanger 24c exchanges heat with the internal air of the left internal 3c while passing through the heat exchanger, and dissipates heat to the internal air to condense. Thereby, the internal air of the left warehouse 3c is heated. The heated internal air circulates inside each of the left warehouses 3c by driving an internal blower fan (not shown), whereby the products stored in the left warehouse 3c are heated to the circulating internal air.

  The refrigerant condensed in the left-side heat exchanger 24 c passes through the heat radiation pipe 42 that constitutes the heat radiation path 40, reaches the gas cooler 41, and radiates heat to the ambient air by the gas cooler 41. The refrigerant radiated by the gas cooler 41 passes through the second strainer S <b> 2 to remove foreign matter, and then adiabatically expands in the second capillary tube 52.

  The refrigerant which is adiabatically expanded and vaporized in the second capillary tube 52 passes through the low-pressure side electromagnetic valves 262 and 263 opened via the distributor 27, and then passes through the internal heat exchanger 24b and the right internal heat exchanger 24a. In this way, the internal heat exchanger 24b and the right internal heat exchanger 24a evaporate to take heat from the internal air of the intermediate internal 3b and the right internal 3a, thereby cooling the internal air. The cooled internal air circulates in each of the inner warehouse 3b and the right warehouse 3a by driving the internal blower fan F1 (see FIG. 2), whereby the products stored in the middle warehouse 3b and the right warehouse 3a are To be cooled. The refrigerant evaporated in each of the internal heat exchanger 24 b and the right internal heat exchanger 24 a is separated into gas and liquid by the accumulator 28, and then the gas phase portion is sucked into the compressor 21 and compressed by the compressor 21. The above-described circulation is repeated. Thus, the refrigerant circuit has a function as a heat pump.

  In such a refrigerant circuit, the external heat exchanger 22 constitutes a condenser that condenses the refrigerant compressed by the compressor 21, and the internal heat exchanger 24 constitutes an evaporator that evaporates the refrigerant adiabatically expanded. In the main path 20, the compressor 21, the external heat exchanger 22, the first capillary tube 23, and the internal heat exchanger 24 are sequentially connected by the refrigerant pipe 25. A cooling path is configured. The internal heat exchanger 24b and the left internal heat exchanger 24c constitute the internal heat exchanger 24 that introduces and condenses a part of the refrigerant compressed by the compressor 21, and includes the branch path 30 and the heat dissipation path 40. The return path 50 constitutes a heating path.

  When the inside temperature of each commodity storage 3 reaches a desired temperature range by performing such an HCC operation, the controller 70 performs the following cooling operation control process and heating operation control process.

  FIG. 7 is a flowchart showing the processing contents of the cooling operation control process performed by the controller 70. In the cooling operation control process shown in FIG. 7, from the internal temperature sensor (in the case of HCC operation, the right internal temperature sensor 61 and the internal internal temperature sensor 62) through the input processing unit 71 while the compressor 21 is being driven. When the right internal temperature and the internal internal temperature are respectively input (step S101: Yes, step S102: Yes), the cooling operation control unit 73 of the controller 70 provides information on the cooling off temperature from the memory 80 through the cooling temperature determination unit 731. Is read out, and the cooling-off temperature is compared with the right-chamber temperature and the inner-chamber temperature, and it is determined whether the right-chamber temperature and the inner-chamber temperature are equal to or lower than the cooling-off temperature, respectively (step S103). .

  When the internal temperature is equal to or lower than the cooling off temperature (step S103: Yes), the cooling operation control unit 73 of the controller 70 gives a drive stop command to the compressor 21 through the compressor drive processing unit 732 to stop driving (step) After that, the procedure is returned to end the current process. According to this, the cooling inside the right warehouse 3a and the middle warehouse 3b is stopped, and the internal temperature changes in the direction of increasing. In this case, since the refrigerant does not flow into the left internal heat exchanger 24c, the internal air of the left internal 3c is not heated by the left internal heat exchanger 24c. Therefore, the internal temperature of the left warehouse 3c changes in a decreasing direction.

  When the right internal temperature is not equal to or lower than the cooling off temperature (step S103: No), that is, when the right internal temperature exceeds the cooling off temperature, the cooling operation control unit 73 of the controller 70 instructs the compressor 21. The compressor 21 is kept driven (step S105), and then the procedure is returned to end the current process. According to this, as a result of the refrigerant evaporating in the right internal heat exchanger 24a and the internal internal heat exchanger 24b, the internal air of each of the right internal 3a and the internal 3b is cooled, and the internal temperature decreases. Transition in the direction. In this case, as a result of the refrigerant condensing also in the left chamber heat exchanger 24c, the internal air of the left chamber is heated, and the temperature in the left chamber is increased.

  On the other hand, in the state where the compressor 21 is not driven, the right chamber temperature and the inner chamber temperature are input from the right chamber temperature sensor 61 and the inner chamber temperature sensor 62 through the input processing unit 71 (step S101: No, Step S106: Yes), the cooling operation control unit 73 of the controller 70 reads out the information related to the cooling on temperature from the memory 80 through the cooling temperature determination unit 731 and determines the cooling on temperature, the right internal temperature, and the internal internal temperature. It is compared and it is determined whether the temperature in the right compartment and the temperature in the middle compartment are equal to or higher than the cooling on temperature (step S107).

  When the internal temperature is equal to or higher than the cooling on temperature (step S107: Yes), the cooling operation control unit 73 of the controller 70 gives a drive command to the compressor 21 through the compressor drive processing unit 732 to drive (step S108). Thereafter, the procedure is returned to end the current process. According to this, as a result of the refrigerant evaporating in the right compartment heat exchanger 24a and the middle compartment heat exchanger 24b, the internal air of each of the right compartment 3a and the middle compartment 3b is cooled, and the inside temperature decreases. Transition in the direction. In this case, as a result of the refrigerant condensing also in the left internal heat exchanger 24c, the internal air of the left internal 3c is heated, and the left internal temperature rises.

  When the internal temperature is not equal to or higher than the cooling on temperature (step S107: No), that is, when the internal temperature is lower than the cooling on temperature, the cooling operation control unit 73 of the controller 70 gives a command to the compressor 21. Without stopping the drive of the compressor 21 (step S109), the procedure is then returned to end the current process. According to this, internal air is not cooled in each of the right internal heat exchanger 24a and the internal internal heat exchanger 24b, and the internal temperature of each of the right internal 3a and the internal 3b is increased. Transition to. In this case, the internal air of the left warehouse 3c is not heated by the left-side warehouse heat exchanger 24c, and the inside temperature of the left warehouse 3c changes in a decreasing direction.

  FIG. 8 is a flowchart showing the processing contents of the heating operation control process performed by the controller 70. The heating operation control process described here is a process of controlling the drive output of the in-compartment heaters 65b and 65c so that the in-compartment temperature of the target heating compartment (product storage) 3 approaches the heating target temperature.

  In the heating operation control process shown in FIG. 8, the controller 70 inputs the internal temperature from the internal temperature sensor (the left internal temperature sensor 63 in the case of HCC operation) through the input processing unit 71 (step S201: Yes). Then, the heating operation control unit 74 of the controller 70 reads information on the heating target temperature from the memory 80 through the heating temperature calculation unit 741 (step S202), further obtains a deviation between the left-chamber temperature and the heating target temperature, and takes this deviation. Based on this, a PID calculation is performed (step S203). After performing the PID calculation, the heating operation control unit 74 of the controller 70 drives the left internal heater 65c with an output according to the calculation result by the heating temperature calculation unit 741 through the heater drive processing unit 743 (step S204), and thereafter To return the procedure to end the current process. According to this, the internal temperature of the left warehouse 3c which is a heating warehouse changes so that it may approximate the heating target temperature.

  FIG. 9 is a flowchart showing the processing contents of the heating operation stop processing performed by the controller 70. In the heating operation stop process, when the heating operation control unit 74 of the controller 70 determines that the compressor 21 is driven through the compressor operation determination unit 742 while driving the left-inside heater 65c ( (Step S301: Yes, Step S302: Yes), the drive of the left chamber heater 65c is stopped (Step S303), and then the procedure is returned to end the current process. According to this, the refrigerant flows also to the left internal heat exchanger 24c by driving the compressor 21, and the refrigerant passing through the left internal heat exchanger 24c condenses, whereby the internal air of the left internal 3c is heated. The That is, even if the driving of the left chamber heater 65c is stopped, the internal air of the left chamber 3c can be heated by the refrigerant passing through the left chamber heat exchanger 24c.

  When it is determined that the compressor 21 is not driven (step S302: No), the heating operation control unit 74 of the controller 70 maintains the drive of the left internal heater 65c (step S304), and thereafter Return the procedure to end the current process. According to this, the internal temperature of the left warehouse 3c which is a heating warehouse changes so that it may approximate the heating target temperature.

  On the other hand, when it is determined that the compressor 21 is being driven through the compressor operation determination unit 742 in a state where the left chamber heater 65c is not being driven (step S301: No, step S305: Yes), the controller 70 is heated. The operation control unit 74 maintains the drive stop of the left chamber heater 65c (step S306), and then returns the procedure to end the current process. According to this, the refrigerant flows also to the left internal heat exchanger 24c by driving the compressor 21, and the refrigerant passing through the left internal heat exchanger 24c condenses, whereby the internal air of the left internal 3c is heated. The That is, even if the driving of the left chamber heater 65c is stopped, the internal air of the left chamber 3c can be heated by the refrigerant passing through the left chamber heat exchanger 24c.

  When it is determined that the compressor 21 is not driven (step S305: No), the heating operation control unit 74 of the controller 70 drives the left internal heater 65c through the heater drive processing unit 743 (step S307). Thereafter, the procedure is returned to end the current process. According to this, the internal temperature of the left warehouse 3c which is a heating warehouse changes so that it may approximate the heating target temperature.

  That is, when the compressor 21 is driven, the controller 70 stops the driving of the internal heater 65c, whereas when the compressor 21 is stopped, the controller 70 responds to the calculation result by the heating temperature calculation unit 741. The internal heater 65c is driven with a high output.

  FIG. 10 is a flowchart showing the processing content of another heating operation stop process performed by the controller 70. In the heating operation stop process shown in FIG. 10, the heating operation control unit 74 of the controller 70 is in a state where the outer door detection switch SW is turned on while driving the left inner heater 65c (step S401: Yes, (Step S402: Yes), the driving of the left chamber heater 65c is stopped (Step S403), and then the procedure is returned to end the current process. According to this, since the outer door 4 is opened, it can be avoided that the outside air enters the left chamber 3c as a heating chamber and adversely affects the calculation of the heating temperature calculation unit 741.

  When the outer door detection switch SW is not in the on state (step S402: No), the heating operation control unit 74 of the controller 70 maintains the drive of the left-inside heater 65c (step S404), and then performs the procedure. Return and end the current process. According to this, the internal temperature of the left warehouse 3c which is a heating warehouse changes so that it may approximate the heating target temperature.

  On the other hand, when the outer door detection switch SW is turned on without driving the left inner heater 65c (step S401: No, step S405: Yes), the heating operation control unit 74 of the controller 70 The driving stop of the heater 65c is maintained (step S406), and then the procedure is returned to end the current process. According to this, since the outer door 4 is opened, it can be avoided that the outside air enters the left chamber 3c as a heating chamber and adversely affects the calculation of the heating temperature calculation unit 741.

  When the outer door detection switch SW is not in the ON state (step S405: No), that is, when the outer door 4 is closed, the heating operation control unit 74 of the controller 70 moves to the left through the heater drive processing unit 743. The internal heater 65c is driven (step S407), and then the procedure is returned to end the current process. According to this, the internal temperature of the left warehouse 3c which is a heating warehouse changes so that it may approximate the heating target temperature.

  That is, when the controller 70 detects that the outer door 4 is opened by the outer door detection switch SW, the controller 70 stops driving the left-inside heater 65c.

  As described above, according to the cooling and heating device according to the present embodiment, when the compressor 21 is driven, the controller 70 stops driving the left chamber heater 65c, so the heating chamber 3c. When the refrigerant passing through the internal heat exchanger 24c disposed in is condensed, the internal air can be supplementarily heated. On the other hand, when the driving of the compressor 21 is stopped, the left chamber heater 65c is driven with an output according to the calculation result by the heating temperature calculation unit 741, so the chamber temperature of the heating chamber 3c is set to the heating target temperature. It can be heated to approximate. Thereby, power consumption can be reduced. Further, since the left chamber heater 65c is driven with an output according to the calculation result by the heating temperature calculation unit 741, there is no need to drive the compressor 21 in response to a heating request, thereby the internal air of the cooling chambers 3a and 3b. Is excessively cooled, and there is no possibility that the goods in the refrigerator are damaged by freezing or the like. Therefore, there is no possibility of damaging the stored product while reducing power consumption.

  Further, according to the cooling and heating device, when the controller 70 detects that the outer door 4 is opened by the outer door detection switch SW, the driving of the left inner heater 65c is stopped. It is possible to avoid adversely affecting the calculation of the heating temperature calculation unit 741 due to the outside air entering the heating chamber 3c, and thus the internal temperature of the heating chamber 3c can be approximated to a desired heating target temperature. become.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to this, and various modifications can be made.

  In the embodiment described above, the case of the HCC operation is shown as an example of the heat pump operation. However, the present invention is not limited to this, and the HHC operation (heating the internal air of the left warehouse 3c and the middle warehouse 3b, and Operation that cools the internal air of the right warehouse 3a) or CHC operation (operation that heats the internal air of the middle warehouse 3b and cools the internal air of the right warehouse 3a and the left warehouse 3c) may be used. In the case of the HHC operation, the product storages to be subjected to the heating operation control process are the left store 3a and the middle store 3b, and the inner heaters are the inner store heater 6b and the left store heater 65c. In the case of the CHC operation, the product storage that is the target of the heating operation control process is the central store 3b, and the internal heater is the internal heater 65b.

  As described above, the cooling and heating apparatus according to the present invention is useful for cooling or heating the internal atmosphere of the commodity storage box defined in the vending machine body of the vending machine to which it is applied.

DESCRIPTION OF SYMBOLS 10 Refrigerant circuit 20 Main path | route 21 Compressor 22 External heat exchanger 23 1st capillary tube 24 Internal heat exchanger 25 Refrigerant piping 27 Distributor 30 Branch path 31 Branch pipe 40 Heat radiation path 41 Gas cooler 42 Heat radiation pipe 50 Return path 51 Return pipe 52 Second capillary tube 61 Right chamber temperature sensor 62 Center chamber temperature sensor 63 Left chamber temperature sensor 65b Center chamber heater 65c Left chamber heater 70 Controller 71 Input processing section 72 Electromagnetic valve drive processing section 73 Cooling operation Control unit 731 Cooling temperature control unit 732 Compressor drive processing unit 74 Heating operation control unit 741 Heating temperature calculation unit 742 Compressor operation determination unit 743 Heater drive processing unit 80 Memory D Rear duct F1 Right internal fan S1 First strainer S2 2nd strainer S3 3rd strainer

Claims (2)

A compressor that compresses the refrigerant; a condenser that condenses the refrigerant compressed by the compressor; an expansion mechanism that adiabatically expands the refrigerant condensed by the condenser; and an evaporation that evaporates the refrigerant adiabatically expanded by the expansion mechanism A cooling path configured by sequentially connecting the devices,
A heating path configured to return the refrigerant condensed in the internal heat exchanger to the cooling path, having an internal heat exchanger for introducing and condensing a part of the refrigerant compressed by the compressor;
When the cooling chamber temperature of the cooling chamber in which the evaporator is disposed is equal to or higher than a predetermined cooling on temperature, the compressor is driven to cool the internal atmosphere of the cooling chamber, while the cooling chamber A cooling control means for stopping driving of the compressor when the temperature is lower than a predetermined cooling off temperature lower than the cooling on temperature;
Heating control means for driving the heating means disposed in the heating chamber by PID control so that the heating chamber temperature of the heating chamber in which the internal heat exchanger is disposed becomes a predetermined heating target temperature. In a cooling and heating device comprising:
The heating control means stops driving of the heating means when the compressor is driven by the cooling control means, whereas when the driving of the compressor by the cooling means is stopped, the heating control means A cooling and heating apparatus, characterized by driving a heating means.   The said heating control means stops the drive of the said heating means, when it detects that the door body of the housing | casing in which the said heating chamber was accommodated is opened by the door detection switch. The cooling heating apparatus according to 1.

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