JP2003302110A - Refrigerating cycle apparatus and automatic vending machine using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerating cycle apparatus capable of greatly reducing a required amount of refrigerant for operation of a refrigerating cycle and being safer in case of leakage of the refrigerant and to provide an automatic vending machine using the apparatus. <P>SOLUTION: A bypass pipe is provided for introducing outlet gas refrigerant of a compressor or non-condensed gas in a condenser into a pipeline leading from vicinity of an outlet of the condenser or from the condenser outlet to a throttle device. This can reduce volumetric capacity occupied by liquid refrigerant while maintaining refrigerating capacity and can reduce an adequate amount of the refrigerant for the refrigerating cycle. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigeration cycle device using a flammable refrigerant and a vending machine using this device.

[0002]

2. Description of the Related Art Currently, in refrigerating and air-conditioning equipment such as refrigerating refrigerators, vending machines, and air conditioners, the use of HFC-based refrigerants as a refrigerant that does not destroy the ozone layer in the cooling system is being promoted. In view of the influence of HFC-based refrigerants on global warming, the use of hydrocarbon refrigerants having a low global warming potential has been studied in recent years. However, since this hydrocarbon refrigerant has flammability, in order to reduce damage due to ignition when the refrigerant leaks, the filling amount in the refrigeration cycle is
It is desirable to reduce it as much as possible.

As a conventional means for reducing the amount of refrigerant charged into a refrigeration cycle, there is one disclosed in Japanese Patent Application Laid-Open No. 8-170859.

Hereinafter, the conventional refrigerant filling amount reducing means will be described with reference to the drawings.

FIG. 6 shows a conventional refrigerant charge amount reducing means. In FIG. 6, 1 is a compressor, 2 is a vibration absorbing joint on the discharge side of the compressor, 3 is a condenser, 4 is a pressure reducing device, 5 is an evaporator, and 6 is a vibration absorbing joint on the suction side of the compressor.

The operation of the above structure will be described below.

First, the refrigerant gas compressed by the compressor 1 is
Through the vibration absorbing joint 2, it flows into the condenser 3, is condensed and liquefied, is decompressed by the decompression device 4, and then flows into the evaporator 5. After that, the refrigerant evaporated and gasified by the evaporator 5 is
It again flows into the compressor 1 via the vibration absorbing joint 6.

At this time, since the vibration absorbing joint 2 and the vibration absorbing joint 6 are connected to the suction side and the discharge side of the compressor 1, the degree of freedom of the pipe connection structure is increased,
The pipe length can be shortened and the amount of refrigerant charged can be reduced.

[0009]

However, in the above-mentioned conventional structure, since the vibration absorbing joint 2 and the vibration absorbing joint 6 are installed in the gas refrigerant portion, the weight of the refrigerant occupied therein is small and the pipe length is long. Even if it can be shortened, there is a drawback that it is difficult to significantly reduce the amount of refrigerant.

The present invention solves the conventional problems.
An object of the present invention is to provide a safer refrigeration cycle device and a vending machine using the refrigeration cycle device, which can drastically reduce the amount of refrigerant necessary for operating the refrigeration cycle efficiently and should the refrigerant leak.

[0011]

According to a first aspect of the present invention, a compressor, a condenser, a throttle device, and an evaporator are connected to an annular circuit by pipes, and a mixed refrigerant or a single refrigerant containing a flammable refrigerant is used. A refrigerant consisting of one refrigerant is enclosed in the annular circuit to form a refrigeration cycle, and an outlet gas refrigerant of the compressor or uncondensed gas in the condenser reaches the expansion device from the vicinity of the condenser outlet or from the condenser outlet. By providing a bypass pipe to be introduced into the pipe, by introducing the discharge gas of the compressor into the pipe portion where a large amount of liquid refrigerant is present, the volume occupied by the gas refrigerant can be increased and the volume occupied by the liquid refrigerant can be reduced. Therefore, the proper amount of refrigerant in the refrigeration cycle can be reduced, and even if the refrigerant leaks to the outside, the possibility of ignition is reduced.

According to a second aspect of the present invention, the compressor, the condenser, the expansion device, and the evaporator are connected to the annular circuit by piping, and the refrigerant composed of a mixed refrigerant or a single refrigerant containing a combustible refrigerant is passed through the annular circuit. To form a refrigerating cycle, in which heat is indirectly exchanged between the compressor outlet pipe of the refrigerating cycle or the pipe near the condenser inlet and the pipe near the condenser outlet. The existing pipe portion in the vicinity of the condenser outlet indirectly absorbs heat from the high temperature compressor outlet pipe, and gas refrigerant is generated, thereby increasing the volume occupied by the gas refrigerant in the vicinity of the condenser outlet where there are many liquid refrigerants.
Since the volume occupied by the liquid refrigerant can be reduced, the appropriate amount of refrigerant in the refrigeration cycle can be reduced, and even if it leaks to the outside, the possibility of ignition is reduced.

According to a third aspect of the present invention, the compressor, the condenser, the expansion device, and the evaporator are connected to the annular circuit by piping, and the refrigerant composed of a mixed refrigerant or a single refrigerant containing a combustible refrigerant is passed through the annular circuit. And a dryer is provided between the compressor and the condenser, between the compressor and the evaporator, or between the expansion device and the evaporator, the container constituting the dryer. Since the inside of the can be filled with a refrigerant gas or a two-phase refrigerant, the amount of the refrigerant occupying the area can be reduced, and the appropriate amount of the refrigerant in the refrigeration cycle can be reduced, and water in the refrigeration cycle can be reliably captured. Therefore, it is possible to provide a refrigeration cycle device having high reliability and safety.

According to a fourth aspect of the present invention, the compressor, the condenser, the expansion device, and the evaporator are connected to the annular circuit by piping, and the refrigerant composed of a mixed refrigerant or a single refrigerant containing a combustible refrigerant is passed through the annular circuit. To form a refrigeration cycle, and an auxiliary throttling device is provided in the middle of the condenser to generate gas by slightly reducing the pressure before becoming saturated liquid in the vicinity of the outlet of the condenser, and a liquid refrigerant. Since the volume occupied by the refrigerant can be reduced, the proper amount of refrigerant in the refrigeration cycle can be reduced, and even if it leaks to the outside, the possibility of ignition is reduced. Further, since the heat exchange is performed in the condenser even after the pressure is slightly reduced by the auxiliary expansion device, the amount of refrigerant to be enclosed can be reduced while substantially maintaining the condensing capacity.

The invention according to claim 5 is the invention according to claims 1 to 4.
The vending machine is configured by using the refrigeration cycle device according to any one of the above items, and it is possible to reduce the appropriate amount of refrigerant in the refrigeration cycle device. It is possible to provide a safe vending machine that has a low concentration and is less likely to catch fire.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a cooling and heating device according to the present invention and a vending machine using the same will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a front view showing a refrigeration cycle apparatus for an automatic vending machine according to an embodiment corresponding to the invention described in claims 1 and 5 of the present invention.

Reference numeral 11 is a main body of a vending machine as a cooling and heating device, which has the middle and left and right chambers 12, 13, 14 at the upper part and a machine room 15 at the lower part. Inside each chamber 12,1
3 and 14 are provided outside by the heat insulating wall 16 and in the machine room 15
The insides of the compartments 12, 13 and 14 are also insulated from each other by the insulating walls 17 and 18 to form a desired temperature space.

Further, the refrigeration cycle apparatus includes a compressor 19,
Solenoid valves 21, 22 and 23, which are connected to the condenser 20 by piping and can open and close the flow paths, capillary tubes 24, 25 and 26 as pressure reducing means, and evaporators provided in the interiors 12, 13 and 14 27, 28, 29 are connected in parallel,
A bypass pipe 30 is branched from the middle of the condenser 20 and is connected to an outlet pipe 32 of the condenser 20 via an auxiliary expansion device 31. Note that here, a refrigeration cycle is configured by enclosing R290 (propane), which is a kind of hydrocarbon of a flammable refrigerant.

33 is a fan for blowing air to the condenser 20, 3
Reference numerals 4, 35, 36 denote internal fans that blow air to the evaporators 27, 28, 29. Reference numeral 37 is a sale product such as a canned drink or a PET drink stored in each of the compartments 12, 13, and 14.

Further, in each of the compartments 12, 13 and 14, a heating heater 38, which is energized when heating the sold product 37,
39 and 40 are provided.

Here, for example, when the inside 12 is cooled, the electromagnetic valve 21 is opened and the electromagnetic valves 22 and 23 are closed, so that the refrigerant discharged from the compressor 19 flows in the direction of the arrow and is condensed. Inflowing into the vessel 20, indirectly exchanging heat with the outside air blown by the fan 33, liquefying itself, passing through the open solenoid valve 21, decompressing with the capillary tube 24, and flowing into the evaporator 27. To do.

Here, the heat indirectly exchanges heat with the air in the interior 12 blown by the fan 33, vaporizes itself and returns to the compressor 19 again.

In this way, the air in the space of the interior 12 is gradually cooled, and the product for sale 3 that comes into contact with the cooled air.
7 is also gradually cooled to reach the desired temperature. In this case, the heating heater 38 is stopped.

The same operation is performed when the insides 13 and 14 are individually cooled, and the same operation is performed in parallel when the two-room or three-room simultaneous cooling operation is performed. Therefore, the description thereof is omitted here. .

Here, the bypass pipe 30 is drawn out from the middle of the pipe forming the condenser 20, the flow rate is limited by the auxiliary expansion device 31, and a part of the gas of the two-phase refrigerant in the middle of condensation in the condenser 20 is partially removed. , Outlet pipe 3 from bypass pipe 30
It will flow directly to 2.

Usually, in order to improve the cooling capacity of the refrigeration cycle, it is necessary to use the supercooled liquid as the outlet refrigerant of the condenser 20. Therefore, the vicinity of the outlet of the condenser 20 flows in the state of the liquid refrigerant, and the outlet pipe 32 is connected to the solenoid valves 21 and 2.
The piping parts up to the expansion devices 24, 25, 26 including 2, 23 are also filled with the liquid refrigerant, and the refrigerant amount in the entire refrigeration cycle becomes very large.

Here, flammable R2 is used as the refrigerant.
Since 90 is used, if it should leak, there is a risk of ignition if there is an ignition source, so it is better to reduce the amount of leaked refrigerant as much as possible. It is desirable to reduce the amount as much as possible.

In the present embodiment, since the bypass pipe 30 is provided so that a part of the gas refrigerant flows into the outlet pipe 32, the throttle devices 24, 25, including the outlet pipe 32 and the solenoid valves 21, 22, 23, The pipe portion up to 26 can be made into a two-phase refrigerant, and the enclosed refrigerant amount of the entire refrigeration cycle can be decreased by significantly reducing the refrigerant amount in this portion. In addition, it is possible to provide a vending machine having a high safety with a small amount of leaked refrigerant.

Since the density of the gas refrigerant is as small as about 15 to 1/20 that of the liquid refrigerant, the void ratio becomes very large even if a slight weight of the gas refrigerant flows into the liquid refrigerant. The gas flows in the supercooled liquid to increase the flow velocity of the liquid refrigerant, and the enthalpy can be kept low as it is, and the refrigerant amount in the pipe can be significantly reduced while maintaining the refrigerating capacity.

In this embodiment, the bypass pipe 30 is used.
Was pulled out from the middle of the piping that constitutes the condenser 20,
This may be withdrawn from the discharge pipe of the compressor 19 and bypassed. In that case, due to the influence of the degree of superheat of the discharge gas, the gas volume occupied in the liquid pipe becomes large even with the gas refrigerant of the same weight. There is an effect that the void ratio is increased and the amount of liquid refrigerant can be further reduced.

On the other hand, when heating the inside 12, 13, 14 of the chamber, the solenoid valves 21, 22, 23 are respectively closed,
By energizing the heating heaters 38, 39, 40, the insides 12, 13, of the compartments blown by the fans 34, 35, 36,
By exchanging heat with the air in the space 14
The air in the spaces 2, 13, and 14 is gradually heated, and the sales product 37 that comes into contact with the heated air is also gradually heated to reach a desired temperature.

Further, by using flammable R600a or R290 as the refrigerant, it contributes to the prevention of global warming, the refrigerant can be easily obtained, and the characteristics such as the ignition point of each refrigerant can be easily grasped. Therefore, it is easy to determine the specifications of the safety protection device and the like.

(Embodiment 2) FIG. 2 is a front view showing a refrigeration cycle device for an automatic vending machine according to an embodiment corresponding to the invention described in claims 2 and 5 of the present invention. Parts having the same configurations and functions as those of the invention described in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

Here, flammable R2 is used as the refrigerant.
Since 90 is used, if it should leak, there is a risk of ignition if there is an ignition source, so it is better to reduce the amount of leaked refrigerant as much as possible. It is desirable to reduce the amount as much as possible.

In the present embodiment, an auxiliary heat exchanger 52 for indirectly exchanging heat between the discharge pipe 50 of the compressor 19 and the outlet pipe 51 of the condenser 20 is provided.

The method of heating and cooling the insides 12, 13, and 14 is the same as that of the first embodiment, and therefore the description thereof is omitted here, but in the present embodiment, the discharge pipe 50 of the compressor 19 and the condenser 20 are omitted. The auxiliary heat exchanger 52 indirectly exchanges heat with the outlet pipe 51.

By doing so, the high-temperature refrigerant gas flowing through the discharge pipe of the compressor 19 and the outlet pipe 51 of the condenser 20.
Heat exchange with the relatively low temperature supercooled refrigerant liquid flowing through the supercooled liquid, the supercooled liquid is heated to reduce the degree of supercooling, approaches the saturated liquid, and gas is generated from the refrigerant liquid. Since the two-phase refrigerant flows in the liquid pipe 53 on the downstream side of the exchanger 52, the amount of refrigerant in the liquid pipe is significantly reduced.

In this embodiment, the expansion device 24, 25, 26 including the outlet pipe 51 and the solenoid valves 21, 22, 23.
The pipe part up to can be made into a two-phase refrigerant, and by significantly reducing the amount of refrigerant in this part, the amount of refrigerant enclosed in the entire refrigeration cycle can also be reduced, so in the unlikely event that the refrigerant leaks. It is possible to provide a vending machine with a small amount of leaked refrigerant and higher safety.

Since the density of the gas refrigerant is as small as about 15 to 1/20 compared with the liquid refrigerant, the void ratio becomes very large even if a slight weight of the gas refrigerant flows into the liquid refrigerant. The saturated gas flows in the supercooled liquid at the same time, and the flow velocity of the liquid refrigerant is increased, so that the enthalpy can be substantially maintained and the refrigerating capacity can be maintained, while the refrigerant amount in the pipe can be greatly reduced.

Although the discharge pipe 50 and the outlet pipe 51 of the compressor 19 are heat-exchanged in this embodiment, a part of the pipe of the condenser 20 may be used instead of the discharge pipe 50.

Further, by using flammable R600a or R290 as the refrigerant, it contributes to the prevention of global warming, the refrigerant can be easily obtained, and the characteristics such as the ignition point of each refrigerant can be easily grasped. Therefore, it is easy to determine the specifications of the safety protection device and the like.

(Embodiment 3) FIG. 3 is a front view showing a refrigeration cycle apparatus for an automatic vending machine according to an embodiment corresponding to the invention described in claims 3 and 5 of the present invention. Parts having the same configurations and functions as those of the invention described in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In this embodiment, the dryer 60 is provided in the suction pipe of the compressor 19.

Further, since the flammable R290 is used as the refrigerant here, if there is a risk of leakage, there is a risk of ignition if an ignition source exists, so the amount of leaking refrigerant should be minimized. It is better, and for that purpose, it is desirable to reduce the amount of refrigerant enclosed in the refrigeration cycle as much as possible.

Usually, in preparation for the case where water is mixed in the refrigeration cycle, a dryer having a container filled with molecular sieves is provided in the refrigeration cycle, and the water is trapped in the dryer so that the water is frozen in the refrigeration cycle. It prevents the flow from getting worse.

The molecular sieves are usually granular, and even if the molecular sieves are filled in a container, a space is generated between the granular molecular sieves.

In the present invention, since the dryer 60 is installed in the suction pipe of the compressor 19, only low-pressure refrigerant gas exists in the gap between the molecular sieves in the dryer 60. Therefore, the amount of refrigerant existing in this portion is extremely small. Becomes a very small amount,
Even if the dryer 60 is provided, the amount of refrigerant in the entire refrigeration cycle does not increase.

As a result, even if water is mixed in the refrigeration cycle, the water can be reliably captured, and the refrigeration cycle can be operated safely, and in the unlikely event that refrigerant leaks, the amount of leaked refrigerant is reduced. It is possible to provide a vending machine with higher safety.

Further, by using flammable R600a or R290 as the refrigerant, it contributes to the prevention of global warming, the refrigerant can be easily obtained, and the characteristics such as the ignition point of each refrigerant can be easily grasped. Therefore, it is easy to determine the specifications of the safety protection device and the like.

Even if the dryer 60 is provided at the discharge pipe of the compressor 19 or at the outlets of the evaporators 27, 28, 29, the same effect can be obtained.

(Embodiment 4) FIG. 4 is a front view showing a refrigeration cycle apparatus for an automatic vending machine according to an embodiment corresponding to the invention described in claims 4 and 5 of the present invention. The same reference numerals are given to the portions having the same configurations and the same functions as those of the inventions described in the first, second, and third embodiments, and description thereof will be omitted.

In this embodiment, an auxiliary expansion device 62 is provided at the outlet of the condenser 61, an auxiliary condenser 63 is provided downstream thereof, and they are connected in series to form a refrigeration cycle.

Further, since flammable R290 is used as the refrigerant, in the unlikely event that it leaks, there is a risk of ignition if an ignition source exists, so it is better to keep the amount of leaking refrigerant as small as possible. For that purpose, it is desirable to reduce the amount of refrigerant enclosed in the refrigeration cycle as much as possible.

Here, the refrigerant discharged from the condenser 61 is slightly decompressed by the auxiliary expansion device 62, and then flows into the auxiliary condenser 63 to further reduce the enthalpy.

This will be described with reference to the pressure-enthalpy diagram shown in FIG. 5 in comparison with the case of one conventional condenser.

That is, in the case of one ordinary condenser, the condensed refrigerant is in the state of point A which is a supercooled liquid, from which the pressure is reduced to low pressure by isenthalpic expansion, and becomes the gas state shown in point B. By taking the amount of heat in the evaporator up to, the amount of cooling heat Δh per unit weight flow rate of the refrigerant is output as the amount of cooling heat.

On the other hand, in order to improve the cooling capacity of the refrigeration cycle, it is necessary to lower the enthalpy at the outlet of the condenser. Therefore, the condensing pressure is made slightly higher and the refrigerant at the outlet of the condenser is a supercooled liquid. . However, since the heat transfer coefficient of the refrigerant liquid is low, the portion occupied by the liquid refrigerant in the condenser becomes very large, resulting in a large amount of refrigerant staying in the condenser.

On the other hand, in the present invention, the condenser 61 is condensed to the point C, and then the auxiliary throttling device 62 is used for the point D.
After that, the auxiliary condenser 63 reduces the enthalpy to the point E to reduce the enthalpy to the same enthalpy point A as in the case of one conventional condenser, and the evaporator can exhibit the same refrigerating capacity of Δh. .

That is, in the auxiliary condenser 63, the pressure is slightly lowered, the condensation temperature is also lowered, and the temperature difference with the air is reduced, which is disadvantageous for heat exchange, but the auxiliary condenser 63 is a two-phase refrigerant. Therefore, the heat transfer coefficient is high, so that the enthalpy at the outlet of the auxiliary condenser 63 can be lowered to the vicinity of the point A.

Further, since the outlet of the auxiliary condenser 63 is in a two-phase state, the amount of refrigerant occupying in the vicinity of the outlet of the auxiliary condenser 63 and in the outlet pipe is very small, and the amount of refrigerant enclosed in the refrigeration cycle is also small. Therefore, even if the refrigerant should leak, the amount of the leaked refrigerant is small, and a vending machine with higher safety can be provided.

In this embodiment, an auxiliary expansion device 62 is provided at the outlet of the condenser 61, and the auxiliary condenser 6 is provided downstream thereof.
3 is provided, but instead of the auxiliary expansion device 62 and the auxiliary condenser 63, an auxiliary expansion device is provided inside the condenser 61, or the pipe near the outlet of the condenser 61 is made thin to increase the pressure loss. The present invention also includes such a configuration.

Further, by using flammable R600a or R290 as the refrigerant, it contributes to the prevention of global warming, the refrigerant can be easily obtained, and the characteristics such as the ignition point of each refrigerant can be easily grasped. Therefore, it is easy to determine the specifications of the safety protection device and the like.

[0064]

As described above, according to the first aspect of the present invention.
The invention described in (1) is a refrigeration cycle in which a compressor, a condenser, a throttle device, and an evaporator are connected to an annular circuit by pipes, and a mixed refrigerant containing a combustible refrigerant or a refrigerant consisting of a single refrigerant is enclosed in the annular circuit. Since the outlet gas refrigerant of the compressor or the uncondensed gas in the condenser is provided with a bypass pipe for introducing the condensation gas in the vicinity of the condenser outlet or the pipe from the condenser outlet to the expansion device, a large amount of liquid refrigerant is present. By introducing high-pressure gas into the existing piping, the piping at the outlet of the condenser can be made into a two-phase refrigerant, and by significantly reducing the amount of refrigerant here, the amount of refrigerant enclosed in the entire refrigeration cycle can also be reduced. Therefore, even if the refrigerant should leak, the amount of the leaked refrigerant is small, and a vending machine with higher safety can be provided.

Further, flammable R600a and R are used as the refrigerant.
By using 290, it contributes to the prevention of global warming, makes it easier to obtain the refrigerant, and can easily grasp the characteristics such as the ignition point of each refrigerant, so the specification of the safety protection device etc. can be determined. Will be easier.

According to a second aspect of the present invention, the compressor, the condenser, the expansion device and the evaporator are connected to an annular circuit by pipes, and a mixed refrigerant containing a flammable refrigerant or a refrigerant consisting of a single refrigerant is used. A refrigeration cycle is formed by enclosing it in the annular circuit, and heat exchange is indirectly performed between the compressor outlet pipe of the refrigeration cycle or the pipe near the condenser inlet and the pipe near the condenser outlet. The discharge gas and the supercooled refrigerant liquid flowing through the outlet pipe of the condenser undergo heat exchange, the degree of supercooling of the supercooled liquid decreases, the saturated liquid approaches the saturated liquid, and gas is generated from the refrigerant liquid, so that the liquid pipe Since the two-phase refrigerant flows in and the amount of refrigerant is greatly reduced, the amount of refrigerant enclosed in the entire refrigeration cycle can also be reduced. Providing vending machines with high safety Rukoto can.

The refrigerant here is flammable R60.
By using 0a or R290, it contributes to the prevention of global warming, makes it easier to obtain the refrigerant, and can easily grasp the characteristics such as the ignition point of each refrigerant, so the specifications of safety protection devices, etc. Will be easier to determine.

According to a third aspect of the present invention, a compressor, a condenser, a throttle device and an evaporator are connected to an annular circuit by pipes, and a mixed refrigerant containing a flammable refrigerant or a refrigerant consisting of a single refrigerant is used. A refrigeration cycle is formed by enclosing in the annular circuit, and a dryer is provided between the compressor and the condenser, between the compressor and the evaporator, or between the expansion device and the evaporator. Only low-pressure refrigerant gas exists in the gap between the molecular sieves, and therefore, the amount of refrigerant present in this portion becomes extremely small, and the amount of refrigerant in the entire refrigeration cycle does not increase.

As a result, even when water is mixed in the refrigeration cycle, the water can be reliably captured and the refrigeration cycle can be operated safely, and in the unlikely event that refrigerant leaks, the amount of leaked refrigerant is reduced. It is possible to provide a vending machine with higher safety.

The refrigerant here is flammable R60.
By using 0a or R290, it contributes to the prevention of global warming, makes it easier to obtain the refrigerant, and can easily grasp the characteristics such as the ignition point of each refrigerant, so the specifications of safety protection devices, etc. Will be easier to determine.

According to a fourth aspect of the present invention, the compressor, the condenser, the expansion device, and the evaporator are connected to an annular circuit by piping, and a mixed refrigerant containing a flammable refrigerant or a refrigerant consisting of a single refrigerant is used. A refrigerating cycle is formed by enclosing in the annular circuit, and an auxiliary expansion device is provided in the middle of the condenser.The refrigerant discharged from the condenser is slightly decompressed by the auxiliary expansion device, and then the auxiliary condenser. Since the enthalpy is further reduced by flowing into the refrigerant, the volume occupied by the liquid refrigerant can be reduced while maintaining a high refrigerating capacity, so that the proper refrigerant amount in the refrigeration cycle can be reduced.

Then, even if it leaks to the outside, the possibility of ignition will be low. Moreover, since the heat exchange is performed in the condenser even after the pressure is slightly reduced by the auxiliary expansion device, the amount of refrigerant to be enclosed can be reduced while the condenser capacity is almost maintained.

According to a fifth aspect of the present invention, an automatic vending machine is configured by using the refrigeration cycle apparatus according to any one of the first to fourth aspects, and an appropriate refrigerant amount of the refrigeration cycle apparatus is set. It is possible to provide a safe vending machine in which the gas concentration at the time of leakage can be reduced and the possibility of ignition is reduced even if the gas leaks to the outside.

[Brief description of drawings]

FIG. 1 is a front view of a first embodiment of a refrigeration cycle apparatus according to the present invention and a vending machine using the same.

FIG. 2 is a front view of a second embodiment of a refrigeration cycle apparatus according to the present invention and a vending machine using the same.

FIG. 3 is a front view of Embodiment 3 of a refrigeration cycle apparatus according to the present invention and a vending machine using the same.

FIG. 4 is a front view of a fourth embodiment of a refrigeration cycle apparatus according to the present invention and a vending machine using the same.

FIG. 5 is a pressure-enthalpy diagram showing the relationship between pressure and enthalpy in the same embodiment.

FIG. 6 is a refrigeration system diagram of a conventional refrigeration cycle apparatus and a vending machine using the same.

[Explanation of symbols]

11 Vending machine body 12, 13, 14 inside 15 Machine room 16, 17, 18 Insulation wall 19 compressor 20,61 condenser 21,22,23 solenoid valve 24, 25, 26 capillary tubes 27, 28, 29 Evaporator 30 bypass pipe 31,62 Auxiliary diaphragm device 32,51 outlet piping 33 fans 34,35,36 In-house fan 37 Sale Items 38, 39, 40 heating heater 50 discharge pipe 52 Auxiliary heat exchanger 53 liquid piping 60 dryer 63 Auxiliary condenser

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Koichi Nishimura             2-3-3 Nojihigashi, Kusatsu City, Shiga Prefecture             Within Matsushita Cold Machinery Co., Ltd. (72) Inventor Kazuhiko Machida             2-3-3 Nojihigashi, Kusatsu City, Shiga Prefecture             Within Matsushita Cold Machinery Co., Ltd. (72) Inventor Shoji Kamei             2-3-3 Nojihigashi, Kusatsu City, Shiga Prefecture             Within Matsushita Cold Machinery Co., Ltd. (72) Inventor Eiko Maki             2-3-3 Nojihigashi, Kusatsu City, Shiga Prefecture             Within Matsushita Cold Machinery Co., Ltd. F term (reference) 3L045 AA03 BA01 CA02 DA02 EA01                       HA03 HA07 JA01 JA11 PA01                       PA04 PA05

Claims (5)

[Claims] 1. A refrigeration cycle in which a compressor, a condenser, a throttle device, and an evaporator are connected to an annular circuit by piping and a mixed refrigerant containing a combustible refrigerant or a refrigerant consisting of a single refrigerant is enclosed in the annular circuit. A refrigerating cycle comprising a bypass pipe configured to introduce an outlet gas refrigerant of the compressor or uncondensed gas in the condenser into a pipe in the vicinity of the condenser outlet or from the condenser outlet to a throttle device. apparatus. 2. A refrigeration cycle in which a compressor, a condenser, a throttle device, and an evaporator are connected to an annular circuit by piping, and a mixed refrigerant containing a combustible refrigerant or a refrigerant consisting of a single refrigerant is sealed in the annular circuit. A refrigeration cycle apparatus, characterized in that heat is indirectly exchanged between a compressor outlet pipe of the refrigeration cycle or a pipe near the condenser inlet and a pipe near the condenser outlet. 3. A refrigeration cycle in which a compressor, a condenser, a throttle device, and an evaporator are connected to an annular circuit by piping, and a mixed refrigerant containing a combustible refrigerant or a refrigerant consisting of a single refrigerant is sealed in the annular circuit. A refrigeration cycle apparatus comprising a dryer provided between the compressor and the condenser, between the compressor and the evaporator, or between the expansion device and the evaporator. 4. A refrigeration cycle in which a compressor, a condenser, a throttle device and an evaporator are connected to an annular circuit by piping and a mixed refrigerant containing a combustible refrigerant or a refrigerant consisting of a single refrigerant is enclosed in the annular circuit. A refrigeration cycle apparatus comprising the above-mentioned condenser and an auxiliary expansion device provided in the middle of the condenser. 5. An automatic vending machine using the refrigeration cycle apparatus according to claim 1.