JP2010271885A - Vending machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vending machine for reducing power consumption by performing a heat pump operation, even in the vending machine configured by serially connecting in-box heat exchangers. <P>SOLUTION: The vending machine is configured by serially wiring-connecting in-box heat exchangers, and wiring-connecting an expanding means between a condenser and each in-box heat exchanger, and provided with a first by-pass duct for by-passing the condenser; a second by-pass duct for by-passing the expanding means; a third by-pass duct for by-passing the expanding means and the in-box heat exchanger at the upstream side of the lowermost stream; a fourth by-pass duct for by-passing the in-box heat exchanger at the lowermost stream; and a fifth by-pass duct for by-passing the heat exchanger installed outside the box. Thus, a heat pump operation without using any heater is achievable. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a vending machine that sells a product such as a beverage in a container such as a can, a bottle, a pack, or a plastic bottle after being cooled or heated in a refrigerant circuit.

Reducing carbon dioxide emissions has become a challenge with recent global warming, and energy-saving vending machines have been developed. As one of the methods, a heat pump type vending machine that uses the heat of the condenser, which has been exhausted in the past, for heating in the cabinet has been developed (for example, see Patent Document 1).
The vending machine described in Patent Document 1 is provided with an internal heat exchanger in each of a plurality of product storages, and is connected to a compressor and an external heat exchanger provided outside the product storage to open an electric expansion valve. By adjusting the degree and switching the electromagnetic valve, each product storage is set for cooling or heating, and a heat pump operation is performed using the internal heat exchanger as a condenser.
However, since this type of vending machine has a plurality of internal heat exchangers connected in parallel, the refrigerant flow to each of the internal heat exchangers is biased to reduce the cooling performance and the piping length is long. There is a problem such as an increase in cost due to becoming.

  On the other hand, in order to cope with these problems, a vending machine in which a plurality of internal heat exchangers are connected in series is known (see, for example, Patent Document 2). In this type of vending machine, an electric heater is installed in the product storage box separately from the internal heat exchanger to perform heating operation. The cooling mode setting mode for each product storage is the operation of cooling or heating the product storage using the symbols C and H, for example, all in order from the left side of the product storage as viewed from the front. When C is cooling, the CCC mode is indicated. When only the right product storage is heated, the CCH mode is indicated.

JP 2001-109942 A JP 2001-167341 A

However, in the vending machine described in Patent Document 2, when the heating operation is performed although the piping configuration is simplified, the internal heat exchanger is paused and heated by the electric heater installed in the same room. It is. For this reason, there exists a subject that power consumption increases significantly compared with the heating operation by heat pump operation.
In addition, since the internal heat exchanger is connected to the pipe in series, the operation using the upstream side as an evaporator and the downstream side as a condenser is difficult, and as a result, the heat pump operation cannot be used. .
The present invention has been made in view of the above, and it is an object of the present invention to provide a vending machine capable of performing heat pump operation and reducing power consumption even in a vending machine having a configuration in which internal heat exchangers are connected in series. .

  In order to achieve the above object, a vending machine according to claim 1 of the present invention has a product storage dedicated for cooling and a plurality of product storages combined for cooling and heating, and is selectively selected according to a cooling heating setting mode. A vending machine that cools or heats the product storage, a compressor that compresses the refrigerant, a condenser that condenses the refrigerant provided outside the warehouse, an expansion means that expands the refrigerant, and a refrigerant that is provided in each cabinet The internal heat exchanger that evaporates or condenses the cooling circulation circuit, and the internal heat exchangers are connected in series to expand between the condenser and each internal heat exchanger. In a vending machine with piping means connected, it is connected to the inlet / outlet of the condenser and bypassed via the solenoid valve, and connected to the inlet / outlet of the expansion means and bypassed via the solenoid valve Second bypass line and upstream from the most downstream Connected to the inlet of the expansion means on the side and the outlet of the internal heat exchanger and connected to the third bypass pipe to be bypassed via a solenoid valve, and the inlet / outlet of the internal heat exchanger provided on the most downstream side Then, between the fourth bypass pipe to be bypassed by the solenoid valve and the outlet side of the internal heat exchanger provided at the most downstream side and the inlet side of the compressor, the bypass is made by the solenoid valve. And a fifth bypass pipe connected to an external heat exchanger for evaporating the refrigerant in the middle of the pipe.

The vending machine according to claim 2 of the present invention is characterized in that in the vending machine according to claim 1, an external heat exchanger is installed in the vicinity of the condenser.
A vending machine according to a third aspect of the present invention is the vending machine according to the first or second aspect, wherein the cooling operation is performed by flowing a refrigerant through the upstream internal heat exchanger, and the downstream internal heat exchanger is provided. When a heating operation is performed with a refrigerant flowing in, the operation is stopped without flowing the refrigerant through one of the internal heat exchangers, and then the refrigerant is supplied to the stopped internal heat exchanger for cooling or heating. It is characterized by driving.

The vending machine according to claim 1 of the present invention includes a compressor that compresses the refrigerant, a condenser that is provided outside the refrigerator and condenses the refrigerant, an expansion means that expands the refrigerant, and evaporates or evaporates the refrigerant. A cooling circulation circuit is constructed with the internal heat exchanger to be condensed, and the internal heat exchanger is connected in series with piping, and expansion means is connected between the condenser and each internal heat exchanger. In the connected vending machine, a first bypass pipe connected to the inlet / outlet of the condenser and bypassed via the electromagnetic valve, and a second bypass connected to the inlet / outlet of the expansion means and bypassed via the electromagnetic valve A bypass pipe, a third bypass pipe connected to the inlet of the expansion means upstream from the most downstream side and the outlet of the internal heat exchanger to be bypassed via a solenoid valve, and a warehouse provided at the most downstream side Connect to the inlet / outlet of the internal heat exchanger and bypass with a solenoid valve Between the fourth bypass line and the outlet side of the internal heat exchanger provided on the most downstream side and the inlet side of the compressor, a bypass is made by an electromagnetic valve, and the refrigerant is evaporated in the middle of the bypass line. By providing the fifth bypass line connected to the external heat exchanger to be performed, the heat pump operation can be performed without using the electric heater in the cooling heating operation, thereby reducing the power consumption. be able to.

The vending machine according to claim 2 of the present invention is the vending machine according to claim 1, wherein the outside heat exchanger is installed in the vicinity of the condenser so that the evaporation efficiency of the outside heat exchanger is increased. Therefore, power consumption can be reduced.
A vending machine according to a third aspect of the present invention is the vending machine according to the first or second aspect, wherein the refrigerant flows into the upstream internal heat exchanger to perform a cooling operation, and the downstream internal heat is stored. When heating with a refrigerant flowing through the exchanger, the operation is stopped without flowing the refrigerant through one of the internal heat exchangers, and then the refrigerant is flowed through the suspended internal heat exchanger for cooling. Alternatively, by performing the heating operation, even if the upstream side heat exchanger is cooled and the downstream side heat exchanger is heated, the heat pump operation can be performed, so that power consumption can be reduced. .

1 is a perspective view showing a vending machine according to an embodiment of the present invention. It is sectional drawing of the vending machine shown in FIG. It is a refrigerant circuit figure concerning the example of the present invention. It is a block diagram of a control apparatus. It is a chart which shows the control table in each setting mode. It is a principal part flowchart of the thermocycle operation control which concerns on the Example of this invention. It is a circuit diagram which shows the flow of the refrigerant | coolant in the setting mode CCC of cooling heating. It is a circuit diagram which shows the flow of the refrigerant | coolant in the setting mode HHC of cooling heating. It is a circuit diagram which shows the flow of the refrigerant | coolant in setting mode CHC of cooling heating. It is a circuit diagram which shows the flow of the refrigerant | coolant in setting mode CH- of cooling heating. It is a refrigerant circuit figure concerning another example of the present invention.

Exemplary embodiments of a vending machine according to the present invention will be described below in detail with reference to the accompanying drawings. Note that the present invention is not limited to the embodiments.
First, a vending machine according to an embodiment of the present invention will be described with reference to a perspective view of FIG. 1 and a sectional view of FIG. In these drawings, the vending machine includes a main body cabinet 10 formed as a rectangular heat insulator having an open front surface, an outer door 20 and an inner door 30 provided on the front surface, and an interior of the main body cabinet 10 in two directions. The bottom plate 11 is partitioned and formed at the stage, and the upper part is cooled by, for example, three independent product storage units 40a, 40b, and 40c separated by two heat insulating partition plates 40w, and the lower part product storage units 40a, 40b, and 40c are cooled or Cooling / heating of the vending machine by the temperature sensor Ta, Tb, Tc disposed inside the machine room 50 for storing the cooling / heating unit 60 for heating and the outer door 20 and in the product storages 40a, 40b, 40c. And a control device 90 that controls operation and the like.

More specifically, the outer door 20 is used to open and close the front opening of the main body cabinet 10 and is not shown in the figure. Product display room, selection button for selecting the product to be sold, money slot for inserting money, product outlet 21 for taking out the paid-out product, etc. Is arranged.
The inner door 30 opens and closes the front surfaces of the product storage units 40a, 40b, and 40c to keep the products in the interior warm. The inner door 30 is a box-shaped structure that is divided into upper and lower stages and has a heat insulator inside. The upper inner door 30a is pivoted at one end to the outer door 20, and the other end is engaged with the outer door 20, and the upper inner door 30a is opened at the same time as the outer door 20 is opened to facilitate replenishment of goods. It is to make. The lower inner door 30b is in a closed state when one end pivots on the main body cabinet 10 and the other end is hooked on the main body cabinet 10 with a latch (not shown) and the outer door 20 is opened. It is possible to prevent the cool air or warm air in the storage cases 40a, 40b, and 40c from flowing out, and to open as necessary during maintenance.

The product storage units 40a, 40b, and 40c are for storing products such as canned beverages and beverages containing plastic bottles at a desired temperature, and the capacity of the storage units is the product storage units 40a, 40c. , 40b in a large manner. In this embodiment, the product storage case 40c is exclusively used for cooling, and the product storage cases 40a and 40b are also used for cooling and heating. The product storage racks 40a, 40b, and 40c store the products in a manner that they are arranged in the vertical direction, and are provided with a product storage rack R that includes a product delivery mechanism for discharging the products one by one in response to a sales signal. There is a product carry-out chute 42 for carrying out the discharged product S to the product take-out port 21 of the outer door via a carry-out door 31 installed in the inner door 30b.
The cooling / heating unit 60 includes a compressor 61, a condenser 62, expanders 63 a, 63 b, 63 c, an external heat exchanger 68, and an accumulator 69 installed in the machine room 50, straddling the bottom plate 11, It has an internal heat exchanger 65a, 65b, 65c and is configured by connecting each device with a refrigerant pipe. The cooling / heating unit 60 cools or heats the product S in the product storage rack R by circulating cool air or warm air in the cabinet according to the cooling / heating setting mode.

The compressor 61 compresses the refrigerant and circulates in the circuit. During the cooling operation, the compressor 61 is used at an evaporation temperature of about −10 ° C. and a condensation temperature of about 40 ° C., and during the heating operation, the evaporation temperature is about Used at −10 ° C. and a condensation temperature of about 70 ° C.
The condenser 62 is a fin tube type heat exchanger, and discharges unnecessary condensation heat during the cooling operation. A fan 62f is installed at the rear of the condenser 62. The fan 62f sucks air from the front opening of the machine chamber 50, sucks heat of condensation by the condenser 62, and absorbs exhaust heat of the compressor 61. Thus, the air is exhausted to the rear opening of the machine room 50.
The expanders 63a, 63b, 63c are for adiabatically expanding the refrigerant that passes through during the cooling operation, and are, for example, capillaries and fixed expansion valves. Moreover, a temperature expansion valve and an electronic expansion valve may be sufficient.

The internal heat exchangers 65a, 65b, 65c are for cooling the product storages 40a, 40b, 40c, and the internal heat exchangers 65a, 65b are the interiors for heating the product storages 40a, 40b. It also serves as a heat exchanger. The capacity of the internal heat exchanger is distributed in a large manner in the order of 65c, 65a, 65b corresponding to the capacity of the product storage. The internal heat exchangers 65a, 65b, 65c are installed at the lower part of each product storage, surrounded by a wind tunnel 67, a fan 65f is installed behind them, and a duct 67d is installed behind them. Has been. The cooling and heating in the product storage are performed by blowing the air cooled or heated by the internal heat exchangers 65a, 65b, 65c to the product S in the product storage, and the duct 67d as shown by the arrow in FIG. It is done by more circulating recovery.
The external heat exchanger 68 is a fin tube type heat exchanger, and is for discharging unnecessary evaporation heat during heat pump operation.

The accumulator 69 is a sealed container for flowing in the refrigerant evaporated from the internal heat exchangers 65a, 65b, 65c, separating the gas and liquid, storing the liquid refrigerant, and returning the gas-phase refrigerant to the compressor 61. . The accumulator 69 is also a container for storing the refrigerant remaining in the refrigerant circulation of the circuit.
The inside temperature sensors Ta, Tb, Tc are installed on the upper surface of the wind tunnel 67 in the product storage 40a, 40b, 40c, and are used to detect the inside temperature of the product storage 40a, 40b, 40c. is there.
The three-way solenoid valve V4 controls the flow of refrigerant into the condenser 62, the three-way solenoid valve V5 controls the flow of refrigerant into the external heat exchanger 68, and the three-way solenoid valve V32 The refrigerant flow into the internal heat exchanger 65c is controlled. These may be a combination of solenoid valves instead of a three-way solenoid valve.

Solenoid valves V11, V21, and V31 control the flow of refrigerant into the expanders 63a, 63b, and 63c, and the electromagnetic valve V12 controls the flow of refrigerant into the expander 63a and the internal heat exchanger 65a. The electromagnetic valve V22 controls the inflow of the refrigerant into the expander 63b and the internal heat exchanger 65b.
The configuration of the refrigerant circuit 60A of the cooling / heating unit 60 will be described in detail with reference to the refrigerant circuit diagram of FIG. In addition, the enclosure of the dotted line in the figure has shown typically goods storage 40a, 40b, 40c.
The main circuit of the refrigerant circuit 60A reaches the condenser 62 from the compressor 61 via the three-way solenoid valve V4 as shown by the thick line in the figure, and the expander 63a, the internal heat exchanger 65a, the expander from the condenser 62 63b, the internal heat exchanger 65b, the expander 63c, and the internal heat exchanger 65c are connected in series and returned to the compressor 61 via the three-way solenoid valve V5 and the accumulator 69.

  The refrigerant circuit 60A is connected to the inlet / outlet of the condenser 62 and bypassed via the three-way solenoid valve V4, as shown by the thin line in the figure with respect to the main circuit, and the expander 63a, 63b, 63c are respectively connected to the inlets and outlets, and bypassed via the solenoid valves V11, V21, V31, the second bypass pipes B11, B21, B31, the inlet of the expander 63a, and the internal heat exchanger 65a Connected to the outlet and bypassed via the solenoid valve V22, connected to the third bypass pipe B12 bypassed via the solenoid valve V12, the inlet of the expander 63b and the outlet of the internal heat exchanger 65b. A third bypass pipe B22, a fourth bypass pipe B32 connected to the inlet / outlet of the internal heat exchanger 65c provided on the most downstream side and bypassed by the three-way solenoid valve V32, and provided on the most downstream side. An external heat exchanger 68 is connected between the outlet side of the front heat exchanger 65c and the inlet side of the compressor 61 by a three-way solenoid valve V5, and the refrigerant is evaporated in the middle of the bypass pipe. And a fifth bypass line B5.

As the refrigerant, a refrigerant used at a critical pressure or lower, for example, a fluorocarbon refrigerant, R134a is used. Moreover, the refrigerant | coolant used above a critical pressure, for example, a carbon dioxide refrigerant, may be sufficient.
The control device 90 controls the cooling or heating of the product storage boxes 40a, 40b, and 40c in the cooling and heating setting mode, and has a CPU and a memory inside as shown in the control block diagram of FIG. Cooling and heating are controlled by setting a cooling and heating mode setting SW91 that sets cooling and heating of the commodity storages 40a, 40b, and 40c. And the control apparatus 90 is the compressor 61, the three-way solenoid valves V4, V5, V32, and the solenoid valves V11, V12, V21 so that the temperatures detected by the internal temperature sensors Ta, Tb, Tc are within a certain temperature range. , V22, V31, etc., the inside temperature is maintained at an appropriate temperature by thermocycle operation that controls ON / OFF.
In the thermocycle operation, when the internal temperature reaches the thermo OFF temperature (for example, -2 ° C for cooling and 61 ° C for heating), the refrigerant flowing into the internal heat exchanger in the product storage is removed. The solenoid valve is opened and closed to shut off, and when the internal temperature reaches the thermo-ON temperature (for example, 8 ° C for cooling and 41 ° C for heating), the internal heat exchanger in the product storage By opening and closing the electromagnetic valve so that the refrigerant flows in, the path of the refrigerant circulating in the circuit is appropriately switched to control the inside of the cabinet at an appropriate temperature. That is, the internal temperature, the thermo OFF temperature, and the thermo ON temperature are compared, and the operation mode in each storage is switched to the three states of the cooling operation, the heating operation, and the pause, and the thermo cycle operation is performed.

Specifically, the control device 90 performs control according to the main part flowchart shown in FIG. 6 using the control table shown in FIG. The left column of FIG. 5 shows the cooling / heating setting mode, the next three columns indicate the cooling, heating, and pause in the operation mode in the cabinet, and “−” indicates the pause mode in the operation mode. In this table, the product storage boxes 40a, 40b, and 40c are described as the left chamber, the middle chamber, and the right chamber, and the following description is also performed in the left chamber 40a, the middle chamber 40b, and the right chamber 40c. The next column shows the operation mode of the solenoid valve by a code, and the specific operation state of the solenoid valve is shown by a table from the next column. In the table, “straight” and “bypass” indicate the passage direction of the refrigerant of the three-way solenoid valve, “straight” indicates a state of opening in the direction passing through the main circuit (linear direction) shown in FIG. The state which opens in the direction which passes in the aspect which detours to each bypass pipe line is shown.
Further, in the cooling and heating setting mode CHC, the refrigerant is supplied to the upstream internal heat exchanger 65a for cooling operation, the refrigerant is supplied to the downstream internal heat exchanger 65b for heating operation, and the downstream storage is further performed. When cooling operation is performed by flowing a refrigerant through the internal heat exchanger 65c, first to third electromagnetic valve operation modes M41a, M41b, and M41c are set. In addition, the refrigerant is allowed to flow through the upstream internal heat exchanger 65a for cooling operation, the refrigerant is allowed to flow through the downstream internal heat exchanger 65b for heating operation, and the downstream internal heat exchanger 65c is suspended. Even in this case, a plurality of solenoid valve operation modes M44a and M44b from the first to the second are set. The cooling operation is performed by flowing the refrigerant through the upstream internal heat exchanger, and the heating operation is performed by flowing the refrigerant through the downstream internal heat exchanger. Since evaporation is performed before, a normal refrigeration cycle cannot be formed. Therefore, in these post-heating forward modes, a plurality of solenoid valve operation modes are provided in which one of the inside heat exchangers to be operated is stopped and operated, and the solenoid valve operation modes are sequentially switched according to the inside temperature. Then, heat pump operation is performed. In the table of FIG. 5, the upstream side heat exchanger is preferentially controlled so that the inside of the storage is at an appropriate temperature.

  Next, the control method will be described with reference to the flowchart shown in FIG. First, the control device 90 detects the internal temperature of each product storage by the temperature sensors Ta, Tb, Tc (S1), and whether the temperature in each storage reaches the thermostat, that is, the thermo OFF temperature. Or whether the thermo-ON temperature has been reached (S2). If the temperature of the storage has not reached the thermostat (S2; N), the operation is continued to return to the detection of the internal temperature (S1). If the temperature of the storage has reached the thermostat (S2; Y), the operation mode is determined corresponding to the state of the internal temperature, and the operation mode of the solenoid valve is determined based on the control table shown in FIG. Selected (S3). If the operation mode of the solenoid valve is not a post-heating forward mode having a plurality of modes (S4; N), an open / close command for the solenoid valve is issued according to the selected operation mode (S5), and the operation mode is switched and stored. The process returns to the internal temperature detection (S1).

If the selected operation mode of the solenoid valve is a post-heating forward mode having a plurality of modes (S4; Y), opening / closing of the solenoid valve in accordance with the operation mode of the first solenoid valve is commanded (S6). Furthermore, detection of the internal temperature (S7) is performed, and it is compared whether the internal temperature related to the operating internal heat exchanger has reached the thermo temperature (S8). If the internal temperature has not reached the thermo temperature (S8) N), the operation is continued and the internal temperature is detected (S7). If the thermostat is reached (S8; Y), it is determined whether the operation mode of the solenoid valve is final (S9). If the operation mode of the solenoid valve is not final (S9; N), the next solenoid valve is operated. An operation mode is selected, and a solenoid valve opening / closing operation corresponding to the mode is commanded (S10). If the operation mode of the solenoid valve is final (S9; Y), each chamber has already reached the appropriate temperature, and then the procedure is returned.
For example, when the cooling / heating mode setting SW91 is set to the CCC mode and the three-room product storage units 40a, 40b, and 40c are at or above the thermo-temperature, the operation mode is set to the cooling mode for all three rooms, M11 is selected as the operation mode, the three-way solenoid valves V4, V32, and V5 are set to open in the main circuit, the solenoid valves V21 and V31 are opened, and the solenoid valves V11, V12, and V22 are closed. At this time, as shown by the thick line in FIG. 7, the high-temperature refrigerant compressed by the compressor 61 is condensed by the condenser 62 to become a liquid, expands by the expander 63a, and becomes a low-temperature low-pressure gas-liquid two-phase flow. It flows into the heat exchanger 65a and evaporates to cool the commodity storage 40a. The refrigerant that has flowed out of the internal heat exchanger 65a flows into the internal heat exchanger 65b from the bypass line B21 and evaporates, thereby cooling the commodity storage 40b. The refrigerant that flows out of the internal heat exchanger 65b flows into the internal heat exchanger 65c from the bypass line B31 and further evaporates, cools the product storage 40c, and the refrigerant that flows out of the internal heat exchanger 65c is Then, it flows into the accumulator 69 that stores the liquid refrigerant, is separated into gas and liquid, and only the gas-phase refrigerant returns to the compressor 61.

  Further, when the cooling / heating mode setting SW91 is set to the HHC mode, the left chamber 40a is at a temperature equal to or lower than the thermo-ON, the middle chamber 40b is within the thermo-temperature, and the right chamber 40c is equal to or higher than the thermo-ON. The operation mode of the solenoid valve is selected as M32 with the left chamber 40a as the heating mode, the middle chamber 40b as the pause mode, and the right chamber 40c as the cooling mode. At this time, the three-way solenoid valve V4 is set to open in a direction to bypass the main circuit, the three-way solenoid valves V32, V5 are set to open to the main circuit, the solenoid valves V11, V22 are opened, and the solenoid valves V12, V12, V21 and V31 are closed. At this time, the refrigerant circulates in the circuit indicated by the thick line in FIG. 8, and the high-temperature refrigerant compressed by the compressor 61 bypasses the condenser 62 from the three-way solenoid valve V4, and further bypasses the expander 63a to bypass the bypass line. It flows into the internal heat exchanger 65a from B11. The refrigerant that flows into the internal heat exchanger 65a condenses and heats the product storage 40a, and the refrigerant that flows out to the internal heat exchanger 65a bypasses the expander 63b and the internal heat exchanger 65b. It flows into the inflator 63c from the pipe line B22. The refrigerant flowing into the expander 63c expands to form a low-temperature and low-pressure gas-liquid two-phase flow and flows into the internal heat exchanger 65c. The refrigerant flowing into the internal heat exchanger 65c evaporates in the internal heat exchanger 65c, cools the product storage 40c, and returns to the compressor 61 via the accumulator 69 from the three-way solenoid valve V5. In this heat pump operation, the inside of the cabinet is maintained at an appropriate temperature by the thermocycle operation.

  Further, when the cooling / heating mode setting SW91 is set to the CHC mode, the left chamber 40a and the right chamber 40c are at a temperature equal to or higher than the thermo-ON, and the middle chamber 40b is equal to or lower than the thermo-ON, the operation mode is set to the left chamber. 40a, the right chamber 40c is the cooling mode, and the middle chamber 40b is the heating mode, and the operation mode of the solenoid valve is first selected as the first M41a. In the first operation mode M41a, the internal heat exchanger 65a located upstream is cooled, the internal heat exchanger 65b located downstream is paused, and the most downstream internal heat exchanger 65a is cooled. At this time, the control device 90 sets the three-way solenoid valves V4, V32, V5 in a direction to open the main circuit, opens the solenoid valves V12, V21, V31, and closes the solenoid valves V11, V22. At this time, the refrigerant circulates in the circuit indicated by the thick line in FIG. 9A, and the high-temperature refrigerant compressed by the compressor 61 is condensed by the condenser 62 and expanded by the expander 63a to be low-temperature and low-pressure. It becomes a gas-liquid two-phase flow and flows into the internal heat exchanger 65a. The refrigerant flowing into the internal heat exchanger 65a evaporates in the internal heat exchanger 65a to cool the product storage 40c, bypasses the expander 63b and the internal heat exchanger 65b, and passes through the bypass line B22. Then, after bypassing the expander 63c and flowing into the bypass line B31, it flows into the internal heat exchanger 65c. The refrigerant flowing into the internal heat exchanger 65c further evaporates in the internal heat exchanger 65c to cool the product storage 40c, and returns to the compressor 61 via the three-way electromagnetic valve V5 and the accumulator 69.

  And if the chamber internal temperature of the left chamber 40a turns into thermo OFF temperature, the control apparatus 90 will select the next operation mode M41b of a solenoid valve. In the next operation mode M41b, the heat exchanger 65a located upstream is paused, the heat exchanger 65b located downstream is heated, and the heat pump operation is performed to cool the heat exchanger 65a located downstream. . Open the three-way solenoid valve V4 in a direction to bypass the main circuit, set the three-way solenoid valves V32, V5 to the main circuit, open the solenoid valves V12, V21, and close the solenoid valves V11, V22, V31 To do. A heat pump operation is performed in which the left chamber is paused, the middle chamber is in heating mode, and the right chamber is in cooling mode. At this time, the refrigerant circulates in the circuit indicated by the thick line in FIG. 9B, and the high-temperature refrigerant compressed by the compressor 61 bypasses the condenser 62 and passes through the bypass line B4. Further, the expander 63a , Bypasses the internal heat exchanger 65a, passes through the bypass line B12, bypasses the expander 63b, passes through the bypass line B21, flows into the internal heat exchanger 65b, condenses, Heat 40b. The refrigerant condensed in the internal heat exchanger 65b expands in the expander 63c, becomes a low-temperature low-pressure gas-liquid two-phase flow, and flows into the internal heat exchanger 65c. The refrigerant flowing into the internal heat exchanger 65c evaporates in the internal heat exchanger 65c, cools the right chamber 40c, and returns to the compressor 61 via the three-way solenoid valve V5 and the accumulator 69.

When the internal temperature of the middle chamber 40b rises to the thermo OFF temperature, the control device 90 selects the last operation mode M41c of the solenoid valve. At this time, the three-way solenoid valves V4, V32, V5 are set in a direction to open the main circuit, the solenoid valves V12, V22 are opened, and the solenoid valves V11, V21, V31 are closed. Only the right chamber 40c is cooled. At this time, the refrigerant circulates in the circuit indicated by the thick line in FIG. 9C, and the high-temperature refrigerant compressed by the compressor 61 is condensed by the condenser 62, and the expander 63a, the internal heat exchanger 65a, It bypasses the expander 63b and the internal heat exchanger 65b, passes through the bypass pipes B12 and B22, flows into the expander 63c, expands to become a low-temperature low-pressure gas-liquid two-phase flow, and enters the internal heat exchanger 65c. To do. The refrigerant flowing into the internal heat exchanger 65c returns to the compressor 61 via the three-way solenoid valve V5 and the accumulator 69.
Further, when the cooling / heating mode setting SW 91 is set to the CHC mode, the left chamber 40a is at a temperature equal to or higher than the thermo-ON, the middle chamber 40b is equal to or lower than the thermo-ON, and the right chamber 40c is within the thermo-temperature. First, M44a is selected as the operation mode of the electromagnetic valve, with the left chamber 40a in the cooling mode, the middle chamber 40b in the heating mode, and the right chamber 40c in the pause mode. In the first operation mode M44a, the internal heat exchanger 65a located upstream is cooled, and the internal heat exchangers 65b and 65c located downstream thereof are suspended.

At this time, the control device 90 sets the three-way solenoid valves V4, V32, V5 in a direction to open the main circuit, opens the solenoid valves V22, V31, and closes the solenoid valves V11, V12, V21. At this time, the refrigerant circulates in the circuit indicated by the thick line in FIG. 10A, and the high-temperature refrigerant compressed by the compressor 61 condenses in the condenser 62, expands in the expander 63a, and has a low temperature and low pressure. It becomes a gas-liquid two-phase flow and flows into the internal heat exchanger 65a. The refrigerant that has flowed into the internal heat exchanger 65a evaporates in the internal heat exchanger 65a to cool the product storage 40c. The refrigerant evaporated in the internal heat exchanger 65a bypasses the expander 63b, the internal heat exchanger 65b, the expander 63c, and the internal heat exchanger 65c, passes through the bypass pipes B22, B31, and B32, and is three-way. It returns to the compressor 61 via the electromagnetic valve V5 and the accumulator 69.
And if the chamber internal temperature of the left chamber 40a falls and it becomes thermo-off temperature, the control apparatus 90 will select the operation mode of a solenoid valve next M44b. The next operation mode M44b is a mode in which the heat pump operation is performed by the internal heat exchanger 65b and the external heat exchanger 68. The control device 90 opens the three-way solenoid valves V4, V32, and V5 in a direction detouring from the main circuit, opens the solenoid valves V12, V21, and V31, and closes the solenoid valves V11 and V22. At this time, the refrigerant circulates in the circuit indicated by the thick line in FIG. 10B, and the high-temperature refrigerant compressed by the compressor 61 bypasses the condenser 62 and passes through the bypass line B4. Further, the expander 63a The internal heat exchanger 65a and the expander 63b are bypassed, pass through the bypass pipes B12 and B21, flow into the internal heat exchanger 65b, condense, and the middle chamber 40b is heated. The refrigerant condensed in the internal heat exchanger 65b expands in the expander 63c to become a low-temperature low-pressure gas-liquid two-phase flow, bypasses the internal heat exchanger 65c, passes through the bypass line B32, and is three-way. It bypasses the electromagnetic valve V5, evaporates in the external heat exchanger 68, and returns to the compressor 61 via the accumulator 69.

Thus, in the mode in which the heating operation is performed, the heat pump operation can be performed without using the electric heater, so that the power consumption can be reduced.
In addition, even when a cooling operation is performed by flowing a refrigerant in the upstream internal heat exchanger and a heating operation is performed by flowing a refrigerant in the downstream internal heat exchanger, the refrigerant is transferred to the operating internal heat exchanger. Then, the operation is stopped without flowing, and then the refrigerant is passed through the suspended internal heat exchanger to perform cooling or heating operation, whereby the upstream internal heat exchanger is cooled and the downstream internal heat is cooled. Even if the exchanger is heated, heat pump operation can be performed, so that power consumption can be reduced.
Another embodiment is shown in FIG. Compared with the above-described embodiment, this embodiment is that the external heat exchanger 68a is disposed in the vicinity of the condenser 62, and the others are substantially the same as the above-described embodiment. The same reference numerals are given and the description thereof is omitted.

  The external heat exchanger 68 a is disposed on the downstream side of the fan 62 f of the condenser 62. According to such a configuration, since the heat of the condenser 62 is blown to the external heat exchanger 68a by the fan 62f, the refrigerant of the external heat exchanger 68a can be efficiently evaporated. Further, the heat radiation fins of the external heat exchanger 68a and the condenser 62 may be used in common. In this case, heat transfer is performed by heat conduction by the radiating fins in addition to heat transfer by blowing air from the fan 62f, so that the refrigerant in the external heat exchanger 68a can be evaporated more efficiently. As a result, power consumption can be reduced.

DESCRIPTION OF SYMBOLS 10 Main body cabinet 20 Outer door 30 Inner door 40a, 40b, 40c Product storage 60 Cooling / heating unit 61 Compressor 62 Condenser 63a, 63b, 63c Expander 65a, 65b, 65c Internal heat exchanger 68 External heat exchange 90 Control device 91 Cooling and heating mode setting SW
B4 1st bypass line B11, B21, B31 2nd bypass line B12, B22 3rd bypass line B32 4th bypass line B5 5th bypass line V4, V5, V32 Three-way solenoid valve V11 , V12, V21, V22, V31 Solenoid valve

Claims (3)

A vending machine that has a product storage dedicated to cooling and a plurality of product storages that are also used for cooling and heating, and selectively cools or heats the product storage according to a setting mode of cooling and heating,
Cooled by a compressor that compresses the refrigerant, a condenser that is provided outside the refrigerator and condenses the refrigerant, an expansion means that expands the refrigerant, and an internal heat exchanger that is provided inside each refrigerator and evaporates or condenses the refrigerant. While configuring a circulation circuit,
In the vending machine in which the internal heat exchanger is connected in series and the expansion means is connected between the condenser and each internal heat exchanger,
A first bypass line connected to the outlet of the condenser and bypassed via a solenoid valve;
A second bypass pipe connected to the inlet / outlet of the expansion means and bypassed via a solenoid valve;
A third bypass pipe connected to the inlet of the expansion means upstream from the most downstream and the outlet of the internal heat exchanger to be bypassed via a solenoid valve;
A fourth bypass pipe connected to the inlet / outlet of the internal heat exchanger provided at the most downstream side and bypassed by a solenoid valve;
An external heat exchanger that bypasses by an electromagnetic valve between the outlet side of the internal heat exchanger provided at the most downstream side and the inlet side of the compressor and evaporates the refrigerant in the middle of the bypass pipe line And a fifth bypass pipe connected to the vending machine. The vending machine according to claim 1, wherein the external heat exchanger is installed in the vicinity of the condenser. When cooling is performed by flowing a refrigerant through the internal heat exchanger on the upstream side, and when the heating operation is performed by flowing the refrigerant through the internal heat exchanger on the downstream side, the refrigerant is supplied to one of the internal heat exchangers. 3. The vending machine according to claim 1 or 2, wherein the operation is stopped without flowing, and the refrigerant is then flowed to the paused internal heat exchanger for cooling or heating operation.