JP2005221205A - Refrigerant apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerant apparatus, restraining overload of a compressor and increase in operating power, improving the durability of the compressor, improving heat exchange effectiveness of an internal heat exchanger, and preventing the occurrence of dew condensation on the surface of an outer side pipe of the internal heat exchanger. <P>SOLUTION: This refrigerant apparatus 1 is provided with a refrigerating unit 11 in which a heat insulating box 3 has a storing space in the interior thereof, and below the heat insulating box 3, a compressor 5, a gas cooler 6, the internal heat exchanger 10, a throttle means 16 and an evaporator 9 stored in a heat insulating case 8 are disposed on a unit base 4. The apparatus is disposed so that the air heat-exchanged by the gas cooler 6 is directed toward the heat insulating case 8, and an air passage 15 is provided between the unit base 4 and the heat insulating case 8 so that the air heat-exchanged by the gas cooler 6 is discharged to the outside through the air passage 15. The internal heat exchanger 10 is embedded in a heat insulating material layer 8A provided in the outer periphery of the heat insulating case 8 for applying heat insulation. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a refrigerant device applicable to vending machines, showcases, and the like. More specifically, the present invention relates to a heat insulating box provided with a storage space, and a unit base below the heat insulating box. Further, the present invention relates to a refrigerant device equipped with a refrigeration unit in which a compressor, a gas cooler, an internal heat exchanger, a throttle means, and an evaporator are arranged.

FIG. 6 is a cross-sectional explanatory view of a conventional refrigerant device. A conventional refrigerant device 1A (an example of a showcase) includes a heat insulating box 3 provided with a storage space 2 therein, a compressor 5, a gas cooler 6 on the unit base 4 below the heat insulating box 3, In addition, a plurality of struts 7 are fixedly provided on the unit base 4, a heat insulating case 8 is installed on the support 7, and an evaporator 9 is accommodated in the heat insulating case 8. In addition, an internal heat exchanger 10 is disposed on the unit base 4 below the heat insulating case 8, and the compressor 5, the gas cooler 6, the internal heat exchanger 10, an unillustrated throttle means and an evaporator 9 are provided. A refrigeration unit 11 that is sequentially connected to form a refrigeration circuit is mounted (see, for example, Patent Document 1, Patent Document 2, and Patent Document 3).
In the figure, 12 is a fan for the gas cooler 6, 13 is a fan for the evaporator 9, 14 is an exhaust port, and 15 is a storage shelf for storing articles.
When the refrigerant device 1A is operated, the refrigerant gas compressed and discharged by the compressor 5 flows into the gas cooler 6, where external air is introduced by the fan 12 as indicated by an arrow (or in the opposite direction of the arrow). Dissipates heat by air cooling. The radiated refrigerant passes through the inside pipe of the internal heat exchanger 10 constituted by double pipes, and the refrigerant gas flows out of the evaporator 9 passing through the outside pipe of the internal heat exchanger 10 there. The heat is taken away by heat exchange and further cooled, and the cooled refrigerant gas on the high pressure side reaches an expansion valve (throttle means) not shown, the pressure is adjusted and the pressure is lowered, and the gas / liquid two-phase mixing In this state, the refrigerant flows into the evaporator 9 where the refrigerant evaporates and absorbs heat from the air to exert a cooling action. The cooled air is indicated by the fan 13 as indicated by the arrow (or the arrow In the opposite direction) and introduced into the storage space 2 of the heat insulating box 3 and circulated.
Thereafter, the refrigerant flows out of the evaporator 9, passes through the outer side pipe of the internal heat exchanger 10, takes heat from the high-pressure side refrigerant passing through the inner side pipe of the internal heat exchanger 10, and performs a heating operation. In response, the refrigerant is completely in a gaseous state, and the refrigerant in the gaseous state repeats a cycle of being sucked into the compressor 5.

Conventionally, chlorofluorocarbon (R11, R12, R134a, etc.) is generally used as a refrigerant in the refrigeration cycle. However, when CFCs are released into the atmosphere, they have problems such as a large warming effect and ozone layer destruction. For this reason, in recent years, other natural refrigerants having little influence on the environment, such as oxygen (O ₂ ), carbon dioxide (CO ₂ ), hydrocarbon (HC), ammonia (NH ₃ ), and water (H ₂ O), are used. Research on use as a refrigerant has been conducted. Among these natural refrigerants, oxygen and water are low in pressure and difficult to use as refrigerants in the refrigeration cycle, and ammonia and hydrocarbons are flammable, and therefore have a problem that they are difficult to handle. For this reason, an apparatus using a transcritical refrigerant cycle in which carbon dioxide (CO ₂ ) is used as a refrigerant and the high pressure side is operated as a supercritical pressure has been developed (see Patent Document 4 and Patent Document 5).
Japanese Patent Laid-Open No. 10-96532 JP 2003-56969 A JP 2003-65651 A Japanese Patent Laid-Open No. 10-19401 Japanese Patent Publication No. 7-18602

However, in the conventional refrigerant device 1A, the exhaust gas heat-exchanged by the gas cooler 6 is directed toward the heat insulation case 8 and the internal heat exchanger 10, and after hitting the heat insulation case 8 and the internal heat exchanger 10, the heat insulation case 8 and the internal heat exchanger 10 Around the heat exchanger 10, it flows behind the heat insulating case 8 and the internal heat exchanger 10 and is discharged to the outside through an exhaust port 14 provided at the rear part of the refrigeration unit 9. As a result, the airflow of the exhaust gas heat exchanged by the gas cooler 6 is blocked by the heat insulating case 8 and the internal heat exchanger 10, and the airflow is stagnated around the gas cooler 6 so that the heat does not escape, so that the air cooling of the refrigerant gas in the gas cooler 6 is insufficient. As a result, the operating pressure increases and the compressor 5 is overloaded, the operating power increases, the protective device is activated and stopped, the durability of the compressor 5 is adversely affected, and the service life is shortened. There are problems such as shortening.
Further, since the exhaust gas heat-exchanged by the gas cooler 6 flows around the internal heat exchanger 10, the heat exchange efficiency of the internal heat exchanger 10 is lowered, and the external side pipe of the internal heat exchanger 10 (low pressure flowing out from the evaporator 9). There was a problem that condensation occurred on the surface of the refrigerant on the side.

In the case of using carbon dioxide as the refrigerant, the refrigerant pressure reaches even about 150 kg / cm ² G on the high pressure side, to be about 30-40 kg / cm ² G in the low pressure side, carbon dioxide is used as refrigerant refrigerator In the cycle, the refrigerant pressure is higher and the refrigerant temperature is higher than that of Freon. In particular, when a one-stage compression compressor is used, each sliding member has a portion where the high pressure side portion and the low pressure side portion are adjacent to each other, and the differential pressure is generated. Therefore, there is a problem that sliding loss and leak cross are likely to occur, and the refrigerant temperature becomes high, so that the air cooling of the refrigerant gas in the gas cooler becomes further insufficient.

  An object of the present invention is to solve various problems of the prior art and to allow the exhaust gas heat-exchanged by the gas cooler to flow well without stagnation, sufficiently cooling the refrigerant gas in the gas cooler and causing the compressor to become overloaded. Increases the durability of the compressor without increasing the operating power, improves the heat exchange efficiency of the internal heat exchanger, and prevents condensation from forming on the external pipe surface of the internal heat exchanger It is also possible to provide a refrigerant device that can suppress the occurrence of sliding loss and leaking and insufficient air cooling of refrigerant gas in a gas cooler as much as possible even when carbon dioxide is used as a refrigerant.

The refrigerant device according to claim 1 of the present invention for solving the above problems includes a heat insulating box having a storage space therein, a compressor and a gas cooler on the unit base below the heat insulating box. A refrigeration unit in which an internal heat exchanger, a throttle means and an evaporator housed in a heat insulation case are arranged, and the compressor, gas cooler, internal heat exchanger, throttle means and evaporator are sequentially connected to form a refrigeration circuit. An installed refrigerant device,
The gas cooler and the heat insulation case are arranged so that the air heat-exchanged by the gas cooler is directed toward the heat insulation case, and an air passage is provided between the unit base and the heat insulation case, and the air is heat-exchanged by the gas cooler. Is discharged to the outside through the air passage, and the internal heat exchanger or further the throttle means is embedded in a heat insulating material layer provided on the outer periphery of the heat insulating case for providing heat insulation. It is characterized by.

  The refrigerant device according to claim 2 of the present invention is the refrigerant device according to claim 1, wherein at least one of the unit bases corresponding to a portion of the air passage through which most of the air heat-exchanged by the gas cooler passes is provided. An exhaust passage is provided, and the heat exchanged by the gas cooler is discharged to the outside through the exhaust passage.

  The refrigerant device according to claim 3 of the present invention is characterized in that in the refrigerant device according to claim 1 or 2, the refrigeration unit is configured to be detachable and attachable.

  A refrigerant device according to a fourth aspect of the present invention is the refrigerant device according to any one of the first to third aspects, wherein carbon dioxide having a high pressure side at a supercritical pressure is used as a refrigerant, and the compressor is a two-stage compression type. A rotary compressor is used.

The refrigerant device according to claim 1 of the present invention includes a heat insulating box provided with a storage space therein, a compressor, a gas cooler, an internal heat exchanger, a throttle on a unit base below the heat insulating box. And a refrigerant device equipped with a refrigeration unit in which a compressor and a gas cooler, an internal heat exchanger, a throttling means and an evaporator are sequentially connected to form a refrigeration circuit. ,
The gas cooler and the heat insulation case are arranged so that the air heat-exchanged by the gas cooler is directed toward the heat insulation case, and an air passage is provided between the unit base and the heat insulation case, and the air is heat-exchanged by the gas cooler. Is discharged to the outside through the air passage, and the internal heat exchanger or further the throttle means is embedded in a heat insulating material layer provided on the outer periphery of the heat insulating case for providing heat insulating properties. The exhaust gas heat exchanged by the gas cooler can be flowed and discharged well without stagnation, the refrigerant gas can be sufficiently cooled in the gas cooler, the compressor will not be overloaded or the operating power will not increase, and the compressor In addition to improving durability, the heat exchange efficiency of the internal heat exchanger can be improved, and condensation can be prevented from occurring on the surface of the external side tube of the internal heat exchanger. Downsizing of the apparatus exhibits a remarkable effect that.

  The refrigerant device according to claim 2 of the present invention is the refrigerant device according to claim 1, wherein at least one unit base portion corresponding to a portion of the air passage through which most of the air heat-exchanged by the gas cooler passes is provided. An exhaust passage is provided, and the air heat-exchanged by the gas cooler is exhausted to the outside through the exhaust passage, and the exhaust gas heat-exchanged by the gas cooler can be discharged and flowed better without stagnation. There is a further remarkable effect.

  The refrigerant device according to claim 3 of the present invention is the refrigerant device according to claim 1 or 2, wherein the refrigeration unit is configured to be detachable and attachable. Since the refrigeration unit can be easily attached to or detached from the body, for example, the refrigerant device of the present invention can be manufactured by attaching and assembling the refrigeration unit created in-house to the heat insulating box made by another company, There is a further remarkable effect that the refrigeration unit can be detached from the refrigerant device of the present invention, repaired, etc., and then the refrigeration unit can be mounted and assembled again. .

A refrigerant device according to a fourth aspect of the present invention is the refrigerant device according to any one of the first to third aspects, wherein carbon dioxide having a high pressure side at a supercritical pressure is used as a refrigerant, and the compressor is a two-stage compression type. When carbon dioxide is used as a refrigerant, the refrigerant pressure reaches about 130 to 150 kg / cm ² G on the high pressure side and about 30 to 40 kg / cm on the low pressure side. Although it becomes cm ² G, since the differential pressure in each sliding member is reduced to about 1/2 and the surface pressure is reduced and an oil film is secured, the occurrence of sliding loss and leaking can be suppressed as much as possible. There is a further remarkable effect.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(First embodiment)
FIG. 1 is a cross-sectional explanatory view illustrating an embodiment of the refrigerant device of the present invention.
FIG. 2 is a refrigeration circuit diagram of the refrigerant device of the present invention.
FIG. 3 is a ph diagram of the refrigerant circuit of FIG.
The refrigerant device of the present invention is used for vending machines, refrigerators, showcases, and the like.
The refrigerant device 1 (showcase) of the present invention includes a heat insulating box 3 provided with a storage space 2 therein, a compressor 5, a gas cooler 6, an internal heat on the unit base 4 below the heat insulating box 3. The exchanger 10 and the throttle means 16 are arranged, and a plurality of support columns 7 are fixedly provided on the unit base 4 at intervals, and a heat insulating case 8 is installed on the support columns 7, and the unit base 4 and the heat insulating case 8 is formed, and the evaporator 9 is housed and disposed in the heat insulating case 8, and the exhaust gas heat-exchanged by the gas cooler 6 is disposed to face the heat insulating case 8. The compressor 5, the gas cooler 6, the internal heat exchanger 10, the expansion means 16, and the evaporator 9 are sequentially connected to form a refrigeration unit 11 that forms a refrigeration circuit.
The internal heat exchanger 10 is composed of a double pipe composed of an outer side pipe 10A and an inner side pipe 10B, and is embedded in a heat insulating material layer 8A provided on the outer periphery of the heat insulating case 8 for imparting heat insulating properties. It is arranged. The refrigerant radiated by the air cooler in the gas cooler 6 passes through the internal pipe 10B of the internal heat exchanger 10, and the low-pressure refrigerant flowing out of the evaporator 9 passes through the external pipe 10A to exchange heat. Done.
In the figure, 12 is a fan for the gas cooler 6, 13 is a fan for the evaporator 9, 14 is an exhaust port, and 15 is a storage shelf for storing articles.
Since a plurality of support columns 7 are fixedly provided on the unit base 4 at intervals, and the heat insulation case 8 is installed on the support columns 7, an air passage 15 is provided between the unit base 4 and the bottom of the heat insulation case 8. It is formed.

In FIG. 2, reference numeral 5 denotes an internal intermediate pressure type multi-stage (two-stage) compression rotary compressor, and the lower stage rotary compression element 20 driven by the electric element 18 in the hermetic container 17 and the rotating shaft 19 of the electric element 18. The upper rotary compression element 21 is provided. The compressor 5 compresses the refrigerant gas sucked from the refrigerant introduction pipe 22 by the lower rotary compression element 20 and discharges the refrigerant gas into the sealed container 17. The intermediate pressure refrigerant gas in the sealed container 17 is temporarily supplied from the refrigerant introduction pipe 23. Discharge to the intermediate cooling circuit 24.
The intermediate cooling circuit 24 is provided so that the refrigerant gas passes through the intermediate cooling heat exchanger 25, where the refrigerant gas is cooled by air and sucked into the upper rotary compression element 21 from the refrigerant introduction pipe 23 and compressed. The The refrigerant gas that has become high pressure due to the second-stage compression is discharged from the refrigerant discharge pipe 26 and is air-cooled by the gas cooler 6. The refrigerant discharged from the gas cooler 6 exchanges heat with the refrigerant discharged from the evaporator 9 in the internal heat exchanger 10, then enters the evaporator 9 through the throttling means (capillary tube) 16, evaporates, and then returns to the internal heat again. The refrigerant is sucked from the refrigerant introduction pipe 22 into the lower rotary compression element 20 through the exchanger 10.

The operation in this case will be described with reference to the ph diagram of FIG. The refrigerant is compressed by the lower rotary compression element 20 (obtains enthalpy Δh3) and becomes an intermediate pressure, and the refrigerant discharged into the sealed container 17 (state 2 in FIG. 3) exits from the refrigerant introduction pipe 23 and is an intermediate cooling circuit. 24. And it flows in into the heat exchanger 25 for intermediate cooling which this intermediate cooling circuit 24 passes, and is thermally radiated there by an air cooling system (3 state of FIG. 3). Here, the intermediate-pressure refrigerant loses enthalpy Δh1 in the intermediate cooling heat exchanger 25 as shown in FIG.
After that, it is sucked into the upper rotary compression element 21 and compressed in the second stage to become high-pressure and high-temperature refrigerant gas, which is discharged to the outside through the refrigerant discharge pipe 26. At this time, the refrigerant is compressed to an appropriate supercritical pressure (state 4 in FIG. 3).

The refrigerant gas discharged from the refrigerant discharge pipe 26 flows into the gas cooler 6, where it is radiated by the air cooling system (state 5 ′ in FIG. 3) and then passes through the inner side pipe 10 </ b> B of the internal heat exchanger 10. . Then, the refrigerant is further cooled by being deprived of heat by the low-pressure side refrigerant passing through the external pipe 10A of the internal heat exchanger 10 (state 5 in FIG. 3) (losing enthalpy by Δh2). Thereafter, the refrigerant is depressurized by the throttle means 16, and in the process it enters a gas / liquid mixed state (state 6 in FIG. 3), and then flows into the evaporator 9 and evaporates (state 1 ′ in FIG. 3). ). The refrigerant exiting from the evaporator 9 passes through the outer side pipe 10A of the internal heat exchanger 10, where it is deprived of heat from the high-pressure side refrigerant and heated (state 1 in FIG. 3) (enthalpy is obtained by Δh2. ).
Then, the refrigerant is heated in the internal heat exchanger 10 and the refrigerant is completely in a gaseous state, and the refrigerant in the gaseous state repeats a cycle in which the refrigerant is sucked into the rotary compression element 20 at the lower stage of the rotary compressor 5 from the refrigerant introduction pipe 22. .

  Although carbon dioxide is used as a refrigerant, since the internal intermediate pressure type multi-stage (two-stage) compression rotary compressor 5 is used as described above, the differential pressure in each sliding member is reduced to about 1/2 and the surface pressure is reduced. As a result, the oil film of the lubricating oil is sufficiently secured, the occurrence of sliding loss and leakage loss can be suppressed as much as possible, and the lubricating oil does not reach a high temperature of 100 ° C. or higher, and a high COP can be obtained.

The refrigerant evaporated in the evaporator 9 exhibits a cooling action by absorbing heat from the air, and the cooled air is introduced into the storage space 2 of the heat insulating box 3 and circulated by the fan 13 as indicated by an arrow. .
The exhaust gas heat-exchanged by the gas cooler 6 passes through the air passage 15 and is discharged to the outside from the exhaust port 14 as indicated by an arrow. As a result, the exhaust gas heat-exchanged by the gas cooler 6 can be flowed and discharged without stagnation, and the refrigerant gas can be sufficiently cooled in the gas cooler 6, so that the compressor 5 becomes overloaded and the operating power increases. The durability of the compressor 5 can be improved.
Since the internal heat exchanger 10 is disposed by being embedded in a heat insulating material layer 8A formed of closed cell foamed polyurethane or the like provided on the outer periphery of the heat insulating case 8 to provide heat insulation, the internal heat exchanger 10 10 can improve the heat exchange efficiency and prevent condensation on the surface of the outer side tube 10A of the internal heat exchanger 10.

(Second Embodiment)
FIG. 4 is an explanatory view for explaining a refrigeration unit of another refrigerant device of the present invention.
The refrigeration unit 11 of the refrigerant apparatus of the present invention shown in FIG. 4 has four vertically long exhaust passages 27 at the position of the unit base 4 corresponding to the portion of the air passage 15 through which most of the exhaust gas heat-exchanged by the gas cooler 6 passes. 1 is provided in the same manner as the refrigerant device 1 of the present invention shown in FIG. 1 except that the exhaust gas heat-exchanged by the gas cooler 6 is discharged to the outside through the exhaust passage 27. .
The refrigeration unit 11 of the refrigerant device of the present invention has the same effect as that of the refrigerant device 1 of the present invention, and the exhaust gas heat-exchanged by the gas cooler 6 flows better without stagnation and flows into the exhaust passage 27 and the exhaust gas. Since the gas can be discharged to the outside through the outlet 14, the refrigerant gas can be sufficiently cooled in the gas cooler 6, and the compressor 5 is not overloaded and the operating power is not increased. Can be improved.

(Third embodiment)
FIG. 5 is an explanatory view illustrating another refrigerant device of the present invention.
The refrigerant device (showcase) 1B of the present invention shown in FIG. 5 is capable of being put in and out of the box 11A under the heat insulating box 3 provided with a storage space 2 therein and below the heat insulating box 3. A compressor 5, a gas cooler 6, an internal heat exchanger 10 and a throttle means (not shown) are arranged on the unit base 4 accommodated, and a plurality of support columns 7 are fixedly provided on the unit base 4 at intervals. The heat insulating case 8 is fixedly installed on the support 7, the evaporator 9 is accommodated in the heat insulating case 8, and the exhaust gas heat-exchanged by the gas cooler 6 is directed toward the heat insulating case 8. The refrigeration unit includes the box 11A in which the compressor 5, the gas cooler 6, the internal heat exchanger 10, the throttling means (not shown) and the evaporator 9 are sequentially connected to form a refrigeration circuit and the whole is housed inside. 11 is a heat insulating box 3 It is constructed by mounting fixed to a predetermined portion of the lower, Figure 1 except, has the same refrigerant system of the present invention shown in FIG.

The exhaust gas heat-exchanged by the gas cooler 6 passes through the air passage 15 and is discharged to the outside from the exhaust port 14, and at the position of the box 11 </ b> A corresponding to the exhaust passage 27 provided through the unit base 4 and the exhaust passage 27. The gas is discharged to the outside through an exhaust port 14B provided therethrough. As a result, the exhaust gas heat exchanged by the gas cooler 6 can flow well without stagnation and be discharged to the outside, and the refrigerant gas can be sufficiently cooled in the gas cooler 6, so that the compressor 5 becomes overloaded and operating power is reduced. The durability of the compressor 5 can be improved without increasing.
Since the internal heat exchanger 10 is disposed by being embedded in a heat insulating material layer 8A formed of closed cell foamed polyurethane or the like provided on the outer periphery of the heat insulating case 8 to provide heat insulation, the internal heat exchanger 10 10 can improve the heat exchange efficiency and prevent condensation on the surface of the outer side tube 10A of the internal heat exchanger 10.
Reference numeral 28 denotes a guide rail provided at a predetermined position on the inner wall of the box body 11A. A guide rail 29 provided on the side of the compressor 5, the gas cooler 6, the heat insulating case 8, etc. disposed on the unit base 4 is provided as a guide rail. 28 is placed in a state where it can slide in and out. A handle 30 is fixedly installed at the front end of the guide rail 29.
When the handle 30 is pulled forward, the refrigerant device 1B of the present invention can be easily pulled out with the compressor 5, the gas cooler 6, the heat insulating case 8, and the like arranged on the unit base 4. After replacing or repairing parts, it can be put back on and installed again.
Although not shown, the box body 11A can also be easily attached to and detached from the heat insulating box 3. The refrigerant unit 1B of the present invention is manufactured by attaching and assembling the refrigeration unit 11 created in-house to the heat insulating box 3 created by another company, or the refrigeration unit 11 is detached from the refrigerant unit 1B of the present invention and repaired. After that, the refrigeration unit 11 can be mounted and assembled again.

  The description of the above embodiment is for explaining the present invention, and does not limit the invention described in the claims or reduce the scope thereof. Moreover, each part structure of this invention is not restricted to the said embodiment, For example, the following various deformation | transformation are possible within the technical scope as described in a claim.

  In the above description, the two-stage compression rotary compressor has been described. However, the present invention is not particularly limited in the form of the compressor, and specifically, a reciprocating compressor, a vibration compressor, and a multi-vane rotary compressor. A scroll compressor or the like may be used, and the number of compression stages may be at least one.

The refrigerant device of the present invention includes a heat insulating box provided with a storage space therein, a compressor, a gas cooler, an internal heat exchanger, a throttle means, and a heat insulating case on the unit base below the heat insulating box. A refrigerant device equipped with a refrigeration unit in which a refrigeration circuit is formed by sequentially connecting the compressor, gas cooler, internal heat exchanger, throttling means and evaporator.
The gas cooler and the heat insulation case are arranged so that the air heat-exchanged by the gas cooler is directed toward the heat insulation case, and an air passage is provided between the unit base and the heat insulation case, and the air is heat-exchanged by the gas cooler. Is discharged to the outside through the air passage, and the internal heat exchanger or further the throttle means is embedded in a heat insulating material layer provided on the outer periphery of the heat insulating case for providing heat insulation. The exhaust gas that has been heat exchanged by the gas cooler can flow and be discharged without stagnation, the refrigerant gas can be sufficiently cooled in the gas cooler, and the compressor does not become overloaded and the operating power does not increase. In addition to improving the durability of the internal heat exchanger, the heat exchange efficiency of the internal heat exchanger can be improved, and condensation can be prevented from occurring on the surface of the external pipe of the internal heat exchanger. Downsizing of the apparatus Te, since a marked effect that a higher industrial value.

It is a section explanatory view explaining one embodiment of a refrigerant device of the present invention. It is a freezing circuit diagram of the refrigerant device of the present invention. FIG. 3 is a ph diagram of the refrigerant circuit of FIG. 2. It is explanatory drawing explaining the refrigeration unit of the other refrigerant device of this invention. It is a section explanatory view explaining other refrigerant devices of the present invention. It is sectional explanatory drawing explaining the conventional refrigerant device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1A, 1B Refrigerating device 2 Storage space 3 Heat insulation box 4 Unit base 5 Compressor 6 Gas cooler 8 Heat insulation case 8A Heat insulation material layer 9 Evaporator 10 Internal heat exchanger 11 Refrigeration unit 15 Air passage 16 Throttle means 27 Exhaust passage

Claims (4)

A heat insulating box with a storage space inside, and a compressor, gas cooler, internal heat exchanger, throttling means and evaporator stored in a heat insulating case are placed on the unit base below the heat insulating box. A refrigerant device equipped with a refrigeration unit in which a compressor, a gas cooler, an internal heat exchanger, a throttle means, and an evaporator are connected in order to form a refrigeration circuit,
The gas cooler and the heat insulation case are arranged so that the air heat-exchanged by the gas cooler is directed toward the heat insulation case, and an air passage is provided between the unit base and the heat insulation case, and the air is heat-exchanged by the gas cooler. Through the air passage to the outside, and
A refrigerant device, wherein the internal heat exchanger or further the expansion means is embedded in a heat insulating material layer provided on an outer periphery of the heat insulating case for imparting heat insulation. At least one exhaust passage is provided at a location of the unit base corresponding to a portion of the air passage through which most of the air heat-exchanged by the gas cooler passes, and the air heat-exchanged by the gas cooler passes outside through the exhaust passage. The refrigerant device according to claim 1, wherein the refrigerant device is discharged. The refrigerant apparatus according to claim 1 or 2, wherein the refrigeration unit is configured to be detachable and attachable. The refrigerant apparatus according to any one of claims 1 to 3, wherein carbon dioxide having a supercritical pressure on the high pressure side is used as a refrigerant, and a two-stage compression rotary compressor is used as the compressor.

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