JP2010033508A - Vending machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vending machine capable of preventing the pressure of a heating wiring system from being abnormally increased by a high temperature/high pressure coolant to be supplied from a compressor when executing a heat pump operation. <P>SOLUTION: A freezing circuit installed in a vending machine 1000 is provided with: a compressor 1; a gas cooler 2 to which a high temperature/high pressure medium is selectively supplied; a left chamber condenser 7a and a middle chamber condenser 7b; capillaries 4a and 4b arranged in parallel to which a middle temperature/high pressure coolant passing through this is selectively supplied; and a left chamber evaporator 6a, a middle evaporator 6b and a right chamber evaporator 6c to which the coolant passing this is selectively supplied. Then, when the compressor 1 is started, the capillary 4a whose fluid resistance is small is used, and when the compressor 1 is stabilized, the capillary 4b whose fluid resistance is large is used. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vending machine, and more particularly, to a vending machine that cools or heats a product such as a beverage in a container such as a can, a bottle, a pack, or a plastic bottle for sale.

Conventionally, a vending machine includes a compressor that compresses a refrigerant, an external condenser that condenses the compressed refrigerant (high temperature and high pressure), an expansion means that expands the condensed refrigerant (medium temperature and high pressure), and the expanded refrigerant. It has an internal evaporator that evaporates (low temperature and low pressure) and a refrigeration cycle that returns the refrigerant (intermediate temperature and low pressure) by sequentially connecting them to the compressor. A product was installed to cool the product.
In addition, a high-pressure high-temperature refrigerant (same as hot gas) is allowed to flow through the internal evaporator, and heat is released in the internal evaporator (functioning as a condenser) to heat the product storage. An invention to be executed is disclosed (for example, see Patent Document 1).

However, according to the invention disclosed in Patent Document 1, the high-temperature and high-pressure refrigerant that goes to the product storage to be heated and the low-temperature and low-pressure refrigerant that flows out of the cooled product storage and returns to the compressor are separated by the open / close valve. Therefore, when there is a leak in the opening / closing valve, the former is mixed with the latter and returns directly to the compressor. As a result, the amount of the high-temperature and high-pressure refrigerant and the low-temperature and low-pressure refrigerant flowing into the commodity storage is reduced, resulting in insufficient heating and insufficient cooling, and in order to prevent this, the load on the compressor increases and energy consumption increases. become.
Therefore, the internal condenser to which the high-temperature and high-pressure refrigerant is supplied to the product storage and the internal evaporator to which the low-temperature and low-pressure refrigerant is supplied are juxtaposed, and a pipe through which the high-temperature and high-pressure refrigerant flows and a low-temperature and low-pressure refrigerant flow. An invention for separating pipes is disclosed (for example, see Patent Document 2).

JP 2002-298210 A (page 3-4, FIG. 1) JP 2007-328762 A (pages 17-18, FIG. 4)

However, the invention disclosed in Patent Document 2 solves the problems in the invention disclosed in Patent Document 1, but has the following new problems.
That is, when the heat pump operation is performed, the high-temperature and high-pressure refrigerant that has flowed out of the compressor is supplied to the internal condenser and then flows into the expansion means (the piping that communicates between them is referred to as a “heating piping system”). The low-temperature and low-pressure refrigerant expanded here is supplied to an in-store evaporator installed in a product storage separate from the product storage in which the internal condenser is installed.
For this reason, when the ambient temperature is low (hereinafter referred to as “low ambient temperature”) or until the refrigerant flow in the expansion means is stabilized immediately after starting the compressor, the high-temperature and high-pressure refrigerant is sequentially supplied from the compressor. For this reason, the pressure of the heating piping system abnormally rises, and there is a risk of damaging the compressor itself or the solenoid valve installed in the heating piping system.

  The present invention solves the above-described problem, and is capable of preventing the pressure of the heating piping system from being abnormally increased by the high-temperature and high-pressure refrigerant supplied from the compressor when performing the heat pump operation. The purpose is to provide.

(1) A vending machine according to the present invention (Claim 1) is disposed within a housing, which is surrounded by a heat insulating material and has an opening on one surface, a heat insulating door for opening and closing the opening, and the housing. A left chamber, a middle chamber and a right chamber partitioned by a partition plate, and a refrigeration circuit for selectively heating or cooling the left chamber, the middle chamber and the right chamber,
The refrigeration circuit is
A compressor for compressing the refrigerant;
A gas cooler to which the refrigerant compressed by the compressor is selectively supplied;
A left chamber condenser arranged in the left chamber and a middle chamber condenser arranged in the middle chamber, which are selectively supplied with refrigerant compressed by the compressor;
Expansion means arranged in parallel to selectively supply the refrigerant that has passed through the gas cooler, or the refrigerant that has passed through one or both of the left chamber condenser or the middle chamber condenser;
The left chamber evaporator disposed in the left chamber, the middle chamber evaporator disposed in the middle chamber, and the right chamber evaporator disposed in the right chamber are selectively supplied with the refrigerant that has passed through the expansion means. And
The compressor, the gas cooler, the expansion means arranged in parallel, the left chamber evaporator, the middle chamber evaporator, the right chamber evaporator, and the compressor are sequentially connected to circulate the refrigerant. A cooling piping system;
A heating piping system that sequentially connects the compressor, the left chamber condenser and the middle chamber condenser, and the expansion means arranged in parallel;
It is characterized by comprising.

(2) The vending machine according to the present invention (Claim 2) is a pair of the expansion means arranged in parallel, and the fluid resistance is different from each other,
When starting the compressor, the refrigerant is supplied to the expansion means having the smaller fluid resistance among the expansion means arranged in parallel, and during the stable operation of the compressor, the fluid resistance of the expansion means arranged in parallel is low. It has a control means for supplying a refrigerant to the larger expansion means.
(3) The vending machine according to the present invention (Claim 3) supplies a refrigerant to all of the expansion means arranged in parallel when the compressor is started, so that the stable operation of the compressor is achieved. Sometimes, it has a control means for supplying a refrigerant to a part of the expansion means arranged in parallel.

(4) The vending machine according to the present invention (Claim 4) is configured to perform heat exchange between the refrigerant that has passed through one or both of the left chamber condenser or the middle chamber condenser and the outside air. It is characterized by having a vessel.
(5) The vending machine according to the present invention (Claim 5) is capable of exchanging heat between the refrigerant that has passed through the gas cooler and the refrigerant immediately before returning to the compressor, and the left chamber condenser and the middle chamber condenser. It has an internal heat exchanger which can exchange heat between the refrigerant passing through one or both of the refrigerant and the refrigerant just before returning to the compressor.
(6) The vending machine according to the present invention (Claim 6) is characterized in that the refrigerant is carbon dioxide.

  (I) The vending machine according to claim 1 of the present invention is a parallel arrangement in which the refrigerant that has passed through the gas cooler, or the refrigerant that has passed through one or both of the left chamber condenser and the middle chamber condenser is selectively supplied. When the heat pump operation is performed, the refrigerant is supplied immediately after the start of the compressor until the refrigerant flow in the expansion means is stabilized and after the refrigerant flow is stabilized. An expansion means can be selected. Therefore, immediately after the start of the compressor, an abnormal increase in the pressure of the heating piping system can be prevented by reducing the fluid resistance in the expansion means. After the refrigerant flow is stabilized, the fluid resistance in the expansion means is reduced. By increasing the value, the temperature of the refrigerant supplied to the right ventricular evaporator or the like can be properly maintained. Further, since an inexpensive capillary can be used instead of an expensive electronic expansion valve, the manufacturing cost can be reduced.

(Ii) Since the vending machine according to claim 2 of the present invention has a pair of expansion means arranged in parallel and has a different fluid resistance, the fluid resistance is small immediately after the start of the compressor. After the refrigerant is supplied to the expansion means and the refrigerant flow is stabilized, the refrigerant is supplied to the expansion means having the larger fluid resistance to prevent an abnormal increase in the pressure of the heating piping system. It becomes possible to maintain the temperature of the refrigerant supplied to the right ventricular evaporator and the like appropriately.
(Iii) The vending machine according to claim 3 of the present invention supplies refrigerant to all of the expansion means arranged in parallel when starting the compressor, and is arranged in parallel during stable operation of the compressor. Since the refrigerant is supplied to some of the expansion means, the same effect as the above (ii) can be obtained.

(Iv) Since the vending machine according to the fourth aspect of the present invention has the external heat exchanger, the heat held by the refrigerant that has passed through one or both of the left chamber condenser and the middle chamber condenser is outside air. And the burden on the expansion means is reduced. This is particularly effective when only one of the left chamber and the middle chamber is heated.
(V) Since the vending machine according to claim 5 of the present invention has an internal heat exchanger, since the heat is transferred to the refrigerant immediately before returning to the compressor and the temperature rises, the burden on the compressor is reduced. Is done.
(Vi) In the vending machine according to claim 6 of the present invention, the refrigerant is carbon dioxide, and the pressure of the heating piping system is abnormally increased by the high-temperature and high-pressure refrigerant supplied from the compressor immediately after starting the compressor. Since it is easy to do, the effect similar to said (ii) becomes remarkable.

(vending machine)
1 to 6 illustrate a vending machine according to an embodiment of the present invention. FIG. 1 is a sectional view in front view, FIG. 2 is a sectional view in side view, and FIG. 4 and 5 are cooling circuit configuration diagrams showing how the refrigerant flows, and FIG. 6 is a correlation diagram between the evaporation temperature and the elapsed time.
1 and 2, the vending machine 1000 includes a cabinet 200 of the main body of the vending machine 1000, a product storage box 400 surrounded by a heat insulating material 300 inside the cabinet 200, and a product storage when the product S is replenished. A product replenishing door 404 that opens and closes the storage 400, a product storage 400 and an inner door 405 for blocking outside air, and a front door 406 of the vending machine 1000 are provided.

The product storage 400 is referred to as a product room (hereinafter referred to as “left room”) 40a, a product room (hereinafter referred to as “middle room”) 40b, and a product room (hereinafter referred to as “right room”) by partition plates 403ab and 403bc. ) 40c.
In addition, in the following description, in the member arrange | positioned in each of the left chamber 40a, the middle chamber 40b, and the right chamber 40c, when explaining the common content, each is put together or each is named individually. The description of “left chamber, middle chamber, right chamber” and the subscripts “a, b, c” may be omitted.

  In each product storage 400, a product storage rack 407 for storing the product S, a product take-out port 409 for taking out the product S that has fallen naturally from the product storage rack 407, and the product S are guided to the product take-out port 409. The product guide plate 408 to be installed is installed, and the lower part of the product guide plate 408 is the internal component storage chamber 410. In addition, a circulation duct 420 for circulating the internal air to the internal component storage chamber 410 via the product storage rack 407 is installed.

In the internal component storage chamber 410, the blower 430 that causes the internal air to pass through the product guide plate 408 (provided with a vent hole) and collide with the product S, and the downstream side (circulation) of the blower 430. The internal heat exchanger 440, the air blowing unit 430 and the internal air heat exchanger 440, and the wind tunnel 460 that communicates with the air duct 450 and passes air are installed on the far side from the duct 420). Has been.
Further, a machine room 480 for housing the condensing unit 470 and the external fan 481 and an electrical equipment storage room 490 for storing electrical equipment and control means are disposed below the product storage 400. Yes.

(Refrigerant circuit)
In FIG. 3, the refrigeration circuit of the vending machine 1000 includes a compressor 1 that compresses refrigerant and a gas cooler that is selectively supplied with a refrigerant compressed by the compressor 1 (hereinafter referred to as “high-temperature and high-pressure refrigerant”). 2 and the left chamber condenser 7a disposed in the left chamber 40a and the middle chamber condenser 7b disposed in the middle chamber 40b, to which the medium temperature and high pressure refrigerant is selectively supplied, and the refrigerant that has passed through the gas cooler 2 (hereinafter, Parallel arrangement in which refrigerant (hereinafter referred to as “medium temperature high pressure refrigerant”) that has passed through one or both of the left chamber condenser 7a and the middle chamber condenser 7b is selectively supplied. Capillaries (same as expansion means) 4a and 4b, and refrigerant that has passed through the capillaries 4a and 4b are selectively supplied, left chamber evaporator 6a disposed in the left chamber 40a, and middle chamber 40b. Middle chamber evaporator 6b And it has a right compartment evaporator 6c arranged in the right chamber 40c, a.
At this time, a flow rate adjusting valve 9a, a flow rate adjusting valve 9b, and a flow rate adjusting valve 9c are installed on the entry side of the left chamber evaporator 6a, the middle chamber evaporator 6b, and the right chamber evaporator 6c, respectively.

In addition, the external heat exchanger 8 for cooling the medium-temperature high-pressure refrigerant that has passed through one or both of the left chamber condenser 7a and the middle chamber condenser 7b supplies the air cooler 481 with the outside air to the gas cooler 2. It is installed inside.
Further, the warm heat possessed by the medium temperature and high pressure refrigerant that has passed through the gas cooler 2 or the warm heat possessed by the medium temperature and high pressure refrigerant that has passed through one or both of the left chamber condenser 7a and the middle chamber condenser 7b is immediately before returning to the compressor 1. An internal heat exchanger 3 is provided for delivery to a refrigerant (hereinafter referred to as “low temperature and low pressure refrigerant”). The internal heat exchanger 3 includes a medium-temperature high-pressure side pipe 3a through which a medium-temperature high-pressure refrigerant flows, and a low-temperature low-pressure side pipe 3b through which a low-temperature low-pressure refrigerant flows. It arrange | positions through a heat-transfer medium.

The compressor 1, the gas cooler 2, the internal heat exchanger 3, the expansion means 4a and 4b arranged in parallel, the left chamber evaporator 6a, the middle chamber evaporator 6b, and the right chamber evaporator 6c, the compressor 1 is connected to the cooling piping system for circulating the refrigerant.
Further, a heating piping system that sequentially connects the compressor 1, the left chamber condenser 7a and the middle chamber condenser 7b, the external heat exchanger 8, and the internal heat exchanger 3 is formed.
In addition, the pipe | tube which connects the member of the code | symbol j, and the member of the code | symbol k is shown by the code | symbol jk, and the solenoid valve (same as an on-off valve) installed in the pipe jk is shown by the code | symbol jkv and the check installed in the pipe jk The valve (same as the check valve) is denoted by jkn.

(Refrigerant flow, when starting CCC operation mode)
In FIG. 4A, the flow of the refrigerant at the start of the CCC operation mode is indicated by a solid line. That is, the high-temperature and high-pressure refrigerant compressed in the compressor 1 flows into the gas cooler 2 via the pipe 12 (the electromagnetic valve 12v is open and the electromagnetic valves 16av and 16bv are closed), and further, via the pipe 23. Then, the medium-temperature and high-pressure refrigerant that has passed through the internal heat exchanger 3 is supplied to the capillary 4a having the smaller fluid resistance. The low-temperature and low-pressure refrigerant expanded in the capillary 4a is branched at the branch point 5, and flows into the pipes 56a, 56b, and 56c (the electromagnetic valves 56av, 56bv, and 56cv are open), and the flow rate adjusting valves 9a, 9b, The flow rate is adjusted by 9c and supplied to the left chamber evaporator 6a, the middle chamber evaporator 6b, and the right chamber evaporator 6c.

Then, the low-temperature and low-pressure refrigerant evaporates (releases cold heat) in the left chamber evaporator 6a, the middle chamber evaporator 6b, and the right chamber evaporator 6c, and cools the left chamber 40a, the middle chamber 40b, and the right chamber 40c. To do. Further, the evaporated refrigerant (the same as the medium temperature and low pressure refrigerant) circulates back to the compressor 1 after passing through the internal heat exchanger 3 via the pipes 63a, 63b and 63c.
In addition, since the check valve 83n is installed in the piping 83 of the heating piping system, the medium temperature and high pressure refrigerant does not flow into the external heat exchanger 8 or the like.

(Refrigerant flow, when CCC operation mode is stable)
In FIG. 4B, the flow of the refrigerant when the CCC operation mode is stable is indicated by a solid line. That is, after the flow in the capillary 4a is stabilized, the medium temperature and high pressure refrigerant is supplied to the capillary 4b having the larger fluid resistance instead of the capillary 4a having the smaller fluid resistance.
Therefore, at the start of the CCC operation mode, an abnormal increase in the pressure of the cooling piping system (compressor 1, gas cooler 2, piping 12, etc.) is prevented by using the capillary 4a having a low fluid resistance. Therefore, the maintainability and durability of the equipment in the refrigeration circuit are improved.
After the refrigerant flow is stabilized, the temperature of the refrigerant supplied to the left ventricular evaporator 6a and the like can be properly maintained by using the capillary 4a having a large fluid resistance.

  At this time, instead of adjusting the flow rate using an expensive electronic expansion valve, an inexpensive capillary tube is used, so that the manufacturing cost is kept low.

In the above, only the capillary 4a having a low fluid resistance is used at the time of starting, but the present invention is not limited to this, and the capillary 4a having a low fluid resistance and the capillary 4b having a high fluid resistance are not limited to this. Both may be used and only the latter may be used when stable.
Furthermore, the fluid resistance of the capillary 4a and the fluid resistance of the capillary 4b may be made equal, and both may be used at the start and one may be used at the time of stability. When one is used, a specific one may be used or alternatively may be used alternately at predetermined intervals.

(Refrigerant flow, when starting HCC operation mode)
In FIG. 5A, the flow of the refrigerant at the start of the HCC operation mode is indicated by a solid line. That is, the high-temperature and high-pressure refrigerant compressed in the compressor 1 flows into the left ventilator condenser 7a via the pipe 16a (the electromagnetic valve 16av is open and the electromagnetic valves 12v and 16bv are closed) and condenses (warmth heat). The left chamber 40a is heated. Further, the refrigerant (medium-temperature high-pressure refrigerant) after heating the left chamber 40a flows into the external heat exchanger 8 and the internal heat exchanger 3, and after further lowering the temperature, the capillary 4a having a smaller fluid resistance is used. To be supplied.
Then, the low-temperature and low-pressure refrigerant expanded in the capillary 4a is branched at the branch point 5, and flows into the pipes 56b and 56c (the electromagnetic valve 56av is closed and the electromagnetic valves 56bv and 56cv are opened). The flow rate is adjusted by 9c and supplied to the left chamber evaporator 6a, the middle chamber evaporator 6b, and the right chamber evaporator 6c.

Then, the low-temperature and low-pressure refrigerant evaporates (releases cold heat) in the middle chamber evaporator 6b and the right chamber evaporator 6c, and cools the middle chamber 40b and the right chamber 40c. Further, the evaporated refrigerant (the same as the medium temperature and low pressure refrigerant) circulates back to the compressor 1 after passing through the internal heat exchanger 3 via the pipes 63a, 63b and 63c.
In addition, since the check valve 23n is installed in the piping 23 of the cooling piping system, the medium temperature and high pressure refrigerant does not flow into the gas cooler 2 or the like.

(Refrigerant flow, when HCC operation mode is stable)
In (b) of FIG. 5, the flow of the refrigerant when the CCC operation mode is stable is shown by a solid line. That is, after the flow in the capillary 4a is stabilized, the medium temperature and high pressure refrigerant is supplied to the capillary 4b having the larger fluid resistance instead of the capillary 4a having the smaller fluid resistance.
Therefore, at the start of the HCC operation mode, by using the capillary 4a having a low fluid resistance, an abnormal increase in the pressure of the heating piping system (the compressor 1, the left chamber condenser 7a, the piping 17a, etc.) is prevented. Yes. After the refrigerant flow is stabilized, the temperature of the refrigerant supplied to the left ventricular evaporator 6a and the like can be properly maintained by using the capillary 4a having a large fluid resistance. At this time, since an inexpensive capillary is used instead of adjusting the flow rate using an expensive electronic expansion valve, the manufacturing cost is kept low.

In the above, only the capillary 4a having a low fluid resistance is used at the time of starting, but the present invention is not limited to this, and the capillary 4a having a low fluid resistance and the capillary 4b having a high fluid resistance are not limited to this. Both may be used and only the latter may be used when stable.
Furthermore, the fluid resistance of the capillary 4a and the fluid resistance of the capillary 4b may be made equal, and both may be used at the start and one may be used at the time of stability. When one is used, a specific one may be used or alternatively may be used alternately at predetermined intervals.

(Stable operation judgment)
In FIG. 6, the vertical axis represents the refrigerant temperature at the outlet of the capillary 4a (the temperature of the low-temperature and low-pressure refrigerant, hereinafter referred to as “evaporation temperature”), and the horizontal axis represents the passage of time.
That is, when the compressor 1 is started at time T0, immediately after that, the evaporation temperature suddenly decreases once and then gradually increases. Then, when the ratio (= ΔK / ΔT) of the increase amount (ΔK) of the evaporation temperature between the predetermined time T1 and the predetermined time T2 (= T1 + ΔY) becomes “1K / min,” or less, stable operation is performed. It determines with having shifted and it switches to use of the capillary 4b with large fluid resistance after time T2.

  According to the present invention, an abnormal increase in high-pressure pressure of a compressor or the like at start-up is prevented, and the maintenance and durability of equipment in the refrigeration circuit are improved. Therefore, the present invention can be widely used as various vending machines.

Sectional drawing of the front view explaining the vending machine which concerns on embodiment of this invention. Sectional drawing of the side view of the vending machine shown in FIG. The block diagram of the cooling circuit installed in the vending machine shown in FIG. The cooling circuit block diagram which shows how the refrigerant | coolant flows in the vending machine shown in FIG. The cooling circuit block diagram which shows how the refrigerant | coolant flows in the vending machine shown in FIG. FIG. 2 is a correlation diagram between evaporation temperature and elapsed time in the vending machine shown in FIG. 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Compressor 2 Gas cooler 3 Internal heat exchanger 3a Medium temperature high pressure side piping 3b Low temperature low pressure side piping 4a Capillary (expansion means)
4b Capillary (expansion means)
5 Branch point 6a Left ventilator evaporator 6b Middle ventilator evaporator 6c Right ventilator evaporator 7a Left ventilator condenser 7b Middle ventilator condenser 8 External heat exchanger 9a Flow rate adjusting valve 9b Flow rate adjusting valve 9c Flow rate adjusting valve 40a Left chamber 40b Middle room 40c Right room 200 Cabinet 300 Insulation material 400 Product storage 403ab Partition plate 403bc Partition plate 404 Product replenishment door 405 Inner door 406 Front door 407 Product storage rack 408 Product guide plate 409 Port 410 Internal component storage chamber 420 Circulation duct 430 Air blower 440 Internal heat exchanger 450 Air duct 460 Wind tunnel 470 Condensing unit 480 Machine room 481 External fan 490 Electrical component storage room 1000 Vending machine S Product

Claims (6)

A housing surrounded by a heat insulating material and having an opening on one side, a heat insulating door that opens and closes the opening, and a left chamber, a middle chamber, and a right chamber partitioned by a partition plate disposed in the housing, A refrigeration circuit for selectively heating or cooling the left ventricle, middle chamber and right ventricle,
The refrigeration circuit is
A compressor for compressing the refrigerant;
A gas cooler to which the refrigerant compressed by the compressor is selectively supplied;
A left chamber condenser arranged in the left chamber and a middle chamber condenser arranged in the middle chamber, which are selectively supplied with refrigerant compressed by the compressor;
Expansion means arranged in parallel to selectively supply the refrigerant that has passed through the gas cooler, or the refrigerant that has passed through one or both of the left chamber condenser or the middle chamber condenser;
The left chamber evaporator disposed in the left chamber, the middle chamber evaporator disposed in the middle chamber, and the right chamber evaporator disposed in the right chamber are selectively supplied with the refrigerant that has passed through the expansion means. And
The compressor, the gas cooler, the expansion means arranged in parallel, the left chamber evaporator, the middle chamber evaporator, the right chamber evaporator, and the compressor are sequentially connected to circulate the refrigerant. A cooling piping system;
A heating piping system that sequentially connects the compressor, the left chamber condenser and the middle chamber condenser, and the expansion means arranged in parallel;
A vending machine characterized by comprising: The expansion means arranged in parallel is a pair, the fluid resistance is different from each other,
When starting the compressor, the refrigerant is supplied to the expansion means having the smaller fluid resistance among the expansion means arranged in parallel, and during the stable operation of the compressor, the fluid resistance of the expansion means arranged in parallel is low. 2. The vending machine according to claim 1, further comprising a control means for supplying the refrigerant to the larger expansion means.   When starting the compressor, the refrigerant is supplied to all of the expansion means arranged in parallel, and during the stable operation of the compressor, some expansion means of the expansion means arranged in parallel The vending machine according to claim 1, further comprising a control unit that supplies a refrigerant to the vehicle.   4. The heat exchanger according to claim 1, further comprising an external heat exchanger that exchanges heat between the refrigerant that has passed through one or both of the left chamber condenser and the middle chamber condenser and the outside air. The vending machine described.   The refrigerant that has passed through the gas cooler and the refrigerant immediately before returning to the compressor can exchange heat, and the refrigerant that has passed through one or both of the left chamber condenser and the middle chamber condenser and the refrigerant immediately before returning to the compressor The vending machine according to claim 1, further comprising an internal heat exchanger capable of exchanging heat with each other.   The vending machine according to any one of claims 1 to 5, wherein the refrigerant is carbon dioxide.

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