JPS6287765A - gas refrigerator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to a gas refrigerator for producing hot heat by adiabatically compressing a gas, and cold heat by adiabatically expanding a gas.

[Prior Art] Refrigeration devices that use gas such as air as a refrigerant have been known for a long time. This type of conventional gas refrigerator is
It has a structure in which a gas compressor, a heat exchanger for dissipating heat of compression, an expander for compressed gas, and a heat exchanger for absorbing heat that is cooled by the heat absorbed during adiabatic expansion of the gas are sequentially connected in a closed cycle. .

As a practical example of the reverse Preyton cycle, an aviation cooling system using a turbine compressor is generally known.

[Problem to be solved by the invention 1 As mentioned above, the four independent components of the compressor, the heat exchangers for heat radiation and heat absorption, and the expander are combined into one gas refrigerator. When this method is incorporated into a large equipment system such as an aircraft, it rarely encounters major obstacles in terms of installation space or operational efficiency, but it is used, for example, in home cold air generators or portable refrigerators for automobiles. For extremely small-sized devices used in daily life, such as those used in daily life, it would be difficult to incorporate a conventional gas refrigerator into equipment because the equipment would be too bulky, and I have not heard of any examples of it being put to practical use.

As a measure to make gas refrigerators more compact, for example, as seen in Japanese Patent Application Laid-Open No. 52-10946J, heat radiation fins are installed on the outer circumferential surface of the cylinder at locations corresponding to the compression region of a vane compressor, and heat dissipation fins are installed on the outer circumference of the expansion region. A method has also been proposed in which heat-absorbing fins are attached to the surface and air is blown onto each fin from a dedicated blower to generate a hot or cold air flow.

However, although this kind of equipment has made some progress in terms of making it more compact, its structure is still complicated, such as requiring two blowers in addition to the compressor drive motor. It is difficult to say that it has been simplified.

The present invention is a gas refrigerator which has a compact external shape, a simple design, and is suitable for everyday use.
For example, the purpose is to provide portable refrigerators and cold air generators.

[Means for solving the problems] In order to achieve the above object, the gas refrigerator of the present invention has the following features:
A pair of reciprocating gas compression pumps that share two reciprocating members for gas compression, and a communication path connecting the discharge port of one pump and the suction port of the other pump of the pair of gas compression pumps. a heat exchange means for dissipating heat generated in the adiabatic compression process of the one pump;
Provided in a communication path connecting the discharge port of the other pump and the suction port of one of the gas compression pumps of the set, for utilizing the cold heat generated in the adiabatic expansion process of the other pump,
Only when the endothermic heat exchange means and the gas compression reciprocating member for the other pump occupy a position near the top dead center of the pump, the discharge port of the one pump and the reciprocating member for the gas compression are connected to each other. a first valve means for communicating the inlet;
When the other pump is in the compression process, a second valve means is adopted for communicating the suction port of the one pump with the discharge port of the other pump.

Function 1 In a gas refrigerator with the above configuration, when the reciprocating member for gas compression is operated, one of the reciprocating gas compression pumps is in the adiabatic compression state. At this time, the other pump is placed in an adiabatic expansion stage. When one pump is in the process of compression, the first valve means is closed, so the gas is compressed by one pump and the gas, which has become high temperature and high pressure, passes through the heat exchange means for heat radiation. The gas becomes a high-pressure gas at room temperature, and is sucked into the other pump through the first valve means that is closed at the end of the compression process.

When the other pump is in the expansion process, the second valve means is closed, so that the normal temperature, high pressure gas that has flowed into this pump is adiabatically expanded into low temperature, normal pressure gas. The low-temperature gas discharged from the second valve means, which is opened when the pump enters the compression process, is sent to the endothermic heat exchange means, where refrigeration work is performed.

The warmed gas that has finished its refrigeration work is sucked into one pump again during the suction process of the other pump, and the same cycle as above is repeated.

[Example] A specific configuration of the present invention will be described below based on an example shown in the accompanying drawings.

1 and 2 are explanatory diagrams of the structure and operation of the first embodiment, in which a set of reciprocating gas compression pumps A has one pump housing shared by two gas compression pumps. By housing one piston 2 as a reciprocating member for gas compression in the cylinder 1 so that these two pumps share it, the cylinders of one pump are placed on both left and right sides (in the figure) of this piston 2. It has a structure in which a chamber 4 and a cylinder chamber 5 of the other pump are formed. The piston 2 is given reciprocating motion via a piston rod 3 by a driving means (not shown) consisting of a combination of a crank and an electric motor.

The cylinder chamber 4 of one pump is provided with a discharge port 4A and a suction port 4B, each provided with a discharge valve 10 and a suction valve 11 as check valves. Further, the cylinder chamber 5 of the other pump is provided with an inlet port 5A and a discharge port 5B.

The piston 2 has a first communication port that allows the discharge port 4A of one pump to communicate with the suction port 5A of the other pump only when the piston occupies a position near the top dead center of the cylinder chamber 5 of the other pump. A communication path 2a is formed as a means. Also, the cylinder chamber 5 of the other pump has a discharge port 5.
There is a small pressure operated valve 12 at B, and a discharge port 5B near the bottom dead center.
A bypass passage 13 is provided for communicating the inside of the cylinder chamber 5 with an endothermic heat exchange means (described later).

Discharge port 4A of one pump and suction port 5A of the other pump
and is connected by a communication path 6. A heat exchange means 7 for heat dissipation is interposed in this communication passage 6, and its role is to cool the high temperature and high pressure gas generated in the compression process of one pump to room temperature, and to effectively utilize absorbed heat as necessary. Fulfill your goals.

Further, the discharge port 5B of the other pump and the suction port 4B of one pump are connected by a communication passage 8. An endothermic heat exchange means 9 is interposed in this communication path 8, and the low temperature normal pressure gas generated in the adiabatic expansion process of the other pump is fed into the communication path 8, so that it can be used in, for example, a refrigerator or an automobile! It can perform cooling tasks such as cooling the air inside the cabin of IIJ cars. Its specific structure will be described later.

Next, the operation of the above embodiment device will be explained.

FIG. 1 depicts one pump at the end of an adiabatic compression stroke and the other pump at the end of an adiabatic expansion stroke. The piston 2 is pushed in the direction of the dashed arrow by the piston rod 3 to the left side in the figure, but under this condition, the discharge valve 1 of the discharge port 4A of the cylinder chamber 4
0 is opened, and the intake port 5A of the cylinder chamber 5 is opened to the piston 2.
Since the gas is sealed by the gas, the gas is compressed, and the high temperature and high pressure gas passes through the heat exchange means 7 for heat dissipation, which is interposed in the communication path 6 to the ports 4A and 5. It is left to cool down to room temperature.

At this time, in the cylinder chamber 5 of the other pump, after being fed under normal temperature and high pressure from one pump in the previous process, the gas is adiabatically expanded as the piston 2 retreats, and a gas is generated. It is filled with low temperature normal pressure gas. When the piston 2 reaches the bottom dead center of the cylinder chamber 5, the bypass passage 13 that has been blocked by the piston 2 is opened as shown in the figure, so that the cylinder chamber 5 and the endothermic heat exchange means 9 are connected via the communication passage 8. When the pressure difference between the two is almost eliminated, the discharge port 5 becomes electrically conductive.
The low pressure valve 12 that had closed B is opened.

Note that the expanding gas in the adiabatic expansion process will carry ~ part of the work of moving the piston 2.

When the piston 2 then reverses and begins to move towards the right in the figure, one pump goes into the expansion stroke and the other goes into the compression stroke, and at the end of the stroke the device is in the state depicted in FIG. Become. In this step in which the screws 1 to 2 move to the right, the low temperature normal pressure gas existing in the cylinder chamber 5 is forced by the piston 2 and passes through the small pressure valve 12, which is opened, and is discharged. The cold heat is sent from the outlet 5B through the communication path 8 to the endothermic heat exchange means 9, and the endothermic heat exchange means 9, which receives the cold heat, performs cooling work such as cooling the inside of a refrigerator or cooling air for air conditioning. The gas, which has returned to normal temperature by passing through the endothermic heat exchange means 9, is sucked into the cylinder chamber 4, which is in the expansion process, through its suction port 4B, and is prepared for the next compression process.

Comparing the configuration of the device of the above embodiment to the conventional gas refrigerator mentioned at the beginning, the device of the present invention has a compressor and an expander independent of each other, whereas the device of the present invention has a compressor and an expander independently. One gas compression pump that plays the role of
Two pistons 2 are provided by these two pumps.
This results in an extremely compact combined structure ((a).

In addition to air, the gas used as the heat transfer medium may be any gas that can effectively utilize the cooling effect associated with adiabatic expansion, such as hydrogen or helium.

FIG. 9 schematically shows the refrigeration cycle of the apparatus of the present invention as a gas refrigerator as a temperature-entropy diagram. The vertical and horizontal axes represent the humidity and entropy of the gas, respectively, and are 1.2
represents an adiabatic compression process, 2.3 represents an isobaric heat release process, 3.4 represents an adiabatic expansion process, and 4 and 1 represent an iso-hepatic endothermic process.

The amount of refrigeration heat in this refrigeration cycle corresponds to the area surrounded by the symbols Qa, b, and 1.4, and the amount of heat radiated to the high temperature side is the area surrounded by the symbols a, b, and 1.4.
The area enclosed by 2.3 corresponds to the area enclosed by the symbol @1.2.3.4, and the heat equivalent of the work consumed by the refrigerator corresponds to the area enclosed by the symbol @1.2.3.4.

FIG. 3 is a schematic side sectional view of the device of the second embodiment, and the main feature is that the external shape of the device is more compact than that of the device of the first embodiment, and the heat exchange means for heat radiation is shown in FIG. The installation method has been changed and the design of the means for opening and closing the suction port of the other pump has been changed accordingly. 6A is a communication passage connecting the discharge port 4A of the cylinder chamber 4 of one gas compression pump and the suction port 5A of the cylinder chamber 5 of the other gas compression pump, and is shared by these two reciprocating pumps. It forms a jacket-like body that surrounds the entire outer periphery of one cylinder 1. Reference numeral 7A denotes a group of annular heat dissipation fins made of a thin metal plate and used as a heat exchange means for heat dissipation attached to the outer peripheral surface of the jacket-like communicating path 6A.

Reference numeral 14 denotes a suction valve provided at the suction port 5Δ of the cylinder chamber 5, which is kept closed by a spring force.When the piston 2 occupies a position near the top dead center of the cylinder chamber 5, a The valve is pushed open.

The operation of the device of the second embodiment is such that the opening/closing means for the intake port 5Δ of the cylinder chamber 5 of the device of the first embodiment is provided in the piston 2 and
-J communication passage 2a, while the above-mentioned suction valve 1
Since there is no difference other than the change to 4, the explanation of the operation will be omitted.

Other symbols in the figure (these are the same as those mentioned above).

Next, a specific usage example of the apparatus of the present invention whose basic structure and operation has been explained with reference to FIGS. 1-j in the first and second embodiments will be described.

Figures 4 and 6 show four explanations of the device of the present invention as a portable refrigeration unit suitable for use in an automobile.

50 is a heat insulating box as a main body part of the refrigerator for storing refrigerated items, and 51 is a lid that is freely attached to the top opening of the box via a hinge part, and is a hollow double-walled box made of synthetic resin. It has a wall structure in which the inner space of the wall is filled with a heat insulating material such as synthetic resin foam. 55 is the insulation box body 5
The heat exchange means for heat dissipation, in this embodiment, is formed by winding a metal tube so that its plane forms the shape of a mouth, as shown in FIG. It is a housing part for the heat exchanger IB for heat dissipation, and has a cage-like shape with a group of ventilation slits provided on the peripheral wall surface. 56 is a power distribution board for operating the device, 57 is a condensation water receiver, and 58 is a lid body 51.
59 is a handle.

A set of reciprocating gas compression pumps 20 incorporated in this embodiment device has a structure as schematically shown in FIG. 5, which is a side sectional view thereof. The housing of a pair of gas compression pumps is formed by pasting together two plate-shaped bodies 21A and 21B made of metal or other rigid material by caulking or welding, with the inner surfaces of the plates facing each other. It is a hollow disc with a sealed structure.
A diaphragm 22 made of a rubber elastic plate or a bellows-shaped metal plate so as to divide the inner space into two in the flat direction.
is incorporated as a reciprocating member for gas compression. 23
and 24 are reinforcing plates that sandwich the central portion of the diaphragm 22 from both sides to prevent deformation of the central portion, and serve as a mounting base for the piston rod 28 to give the diaphragm 22 swing in the membrane surface direction. The two are fastened to each other by rivets or the like. 27 is a flexible joint for connecting one end of the piston rod 28 to the reinforcing plate 24; 29 is a flexible joint for airtightly sealing the gap between the insertion hole of the piston rod 28 bored in the dish-shaped body 21B that constitutes the pump housing wall; It is a bellows-shaped packing made of rubber elastic material.

As described above, the inner space of the hollow disc-shaped pump housing for one set of pumps is airtightly divided into two by the diaphragm 22 in the swinging direction of the diaphragm, and each of the independent spaces 25 and 26 is , by providing a gas inlet 25A or 26A and a gas outlet 25B or 263, respectively, these rain spaces 25 and 26 can be used as the cylinder chamber (air chamber) of one of the pumps shown in FIGS. 1 to 3, respectively. It will perform a function equivalent to the cylinder chamber of the other pump.

The discharge port 25B of the cylinder chamber 25 of one of the pumps serving as the compressor of the gas refrigeration cycle is connected to a heat exchanger for heat radiation interposed in the middle of the communication path 6 as gas piping, as shown in FIG. After 7B, mVEL of gas refrigeration cycle
The suction port 26A of the cylinder chamber 2G of the other pump, which is
It is connected to Also, the cylinder chamber 26 as an expander
As shown in FIG. 4, the outlet 26B follows the communication path 8 as a gas pipe and connects to the cold air blowing grill 52, which is formed at the inner bottom of the insulating box 50 as the refrigerator main body.
It is connected to On the other hand, on the inside upper part of the insulation box 50,
An intake grill 5 for inhaling the warm air that has flowed into the heat insulating box 50 and has risen while exchanging heat with the stored items inside.
3 is provided, and this intake grill 53 is connected to the intake port 25A of the cylinder chamber 25 as a compressor via an air passage 53A formed in the wall of the heat insulating box 50 and a communication passage 8.

Considering the positional relationship in which the cold air outlet grill 52 and the intake grill 53 are disposed at the bottom and the top of the heat insulating box 50, respectively, the cold air blown from the outlet grill to the stored articles B is heated from the articles. It warms up by absorbing heat, rises due to natural convection, and is drawn into the intake grille, so the exchange phenomenon of cold and hot air is performed smoothly and efficiently, and heat exchange between the stored parts and the cold air is carried out efficiently. It will be done.

Therefore, in this embodiment, the discharge port 26B of the cylinder chamber 26 of the other pump as the IIIH machine and the suction port 25A of the cylinder chamber 25 of one pump as the compressor.
A heat exchange means for absorbing heat as a listening cycle is disposed in the middle of the communication path 8 connecting the heat insulating box body 5.
The article storage space 9A in 0 constitutes this interval cycle. Check valves 30 and 31 are provided at the suction port 25A and discharge port 25B of the cylinder chamber 25, respectively, and a diaphragm 22 is provided at the suction port 26A of the cylinder chamber 26 to control the movement of the diaphragm 22 when it moves to its top dead center. A suction valve 32 as a differential pressure valve that is opened in response to the pressure is provided, and a discharge valve 33 as a micro-pressure valve is provided at the discharge port 26B.

40 is a motor for driving the piston rod 28 for swinging the diaphragm 22, 42 is a humidifier fitted to the output shaft 41 for recovering cooling work, and 43 and 44 are a set of gears forming a crank mechanism. The piston rod 28 is caused to reciprocate at an arbitrary period. 45 is a piston pin. Note that one set of pumps and their driving mechanisms are housed in a heat radiating heat exchanger housing 55 with an appropriate heat insulating partition interposed therebetween.

To explain the operation of the above-mentioned refrigerator, the power supply plug (shown in the diagram) of the device is inserted into a power outlet powered by a car battery or a 100V power outlet, and then the refrigerator is turned on by turning on the power switch provided on the switchboard 56. enters the use state and the drive motor 40 starts.

As the drive motor 40 rotates, the crank mechanism causes the diaphragm 22 of the gas compression pump 20 to swing at a predetermined period, so that the cylinder chamber 25 of one of the pumps acts as a gas (air in this case) compressor. The cylinder chamber 2G of the other pump, which acts as a gas expansion mode, undergoes compression steps and expansion steps alternately, just as in the first and second embodiments described above. The operation of the suction valve 32 and discharge valve 33 provided in the cylinder chamber 26 is such that when the diaphragm 22 moves to the top dead center of the cylinder chamber 26, the suction valve 32 is pushed by the movement of the diaphragm 22. Open the valve. Next, while the diaphragm 22 reversely moves toward the bottom dead center, the suction valve 32, which is released from the above-mentioned pressing force, is closed by the valve closing biasing spring. When the diaphragm 22 reaches the bottom dead center, the pressure inside the cylinder chamber 26 decreases to almost the same level as the article storage space 9A in the heat insulating box 50, which serves as an endothermic heat exchange means constituting an open cycle. Discharge valve 33 as a low pressure valve
is opened.

Therefore, during the expansion process of one pump, the parts storage space 9A
The air sucked into the cylinder chamber 25 from ill! in the next compression process. ! i It becomes a high temperature and high pressure state, and the discharge port 25B
From there, it is sent out toward the heat exchanger 7B for heat radiation. The high-pressure air cooled to room temperature by the radiation heat exchanger 7B flows into the cylinder chamber 26 through the intake valve 32 opened as described above, and expands adiabatically as the diaphragm 22 moves backward. As a result, part of the power consumed in the operation of the diaphragm 22 is recovered, and the pressure is returned to normal pressure. Goods storage space 9
The cold air is pushed out toward A, and the stored cold energy of this cold air cools the article B inside the warehouse. The incoming air, which has been warmed by being transferred with the heat held by the article B, is sucked into the cylinder chamber 25 again in the suction process of one of the pumps, and thereafter, such a cycle is repeated, and the article B reaches the limit of the heat exchange capacity of the device. It gradually cools down inside.

To exemplify the specifications of a prototype refrigerator with the above structure, the volumes of the cylinder chambers 25 and 26 are 24 CC, respectively.
When the rotational speed of the drive motor 40 is set to 1,000 rpm, the compression ratio of the pump is set to 1.5, the inner diameter of the coiled pipe constituting the heat radiation heat exchanger 7B is set to 6 ml, and the length is set to 6 m, the air The circulation rate was 20 fl/1lli, and the refrigeration capacity was 10 KCa (l/h), making it possible to lower the temperature of the air blown into the heat insulating box 50 to 6°C when the outside temperature was 35°C. Item storage space 9 of this prototype
The volume of A is 10u1 The external dimensions of the device are 300X 300
x200mm 1 and power consumption was 13W.

FIGS. 7 and 8 are explanatory diagrams of an embodiment of the device according to the present invention as a fan having a built-in gas refrigerator. This embodiment is essentially the same as the previous embodiment except for the following points. 60 is a box-shaped electric fan housing made of synthetic resin, 62 and 63 are cooling air intakes and cooling air outlet grilles provided in the housing 60, 61 is a fan of the electric fan, and 64 is an opening. The cold air outlet 65 to the endothermic heat exchange means constituting the cycle is a portable handle, and the inlet of warm air warmed by heat exchange corresponds to the air intake port 62. 40A is a double-shaft motor that serves both to drive a set of gas compression pumps 70 and to drive the electric fan 61, 66 is a plug for a power supply cord to the double-shaft motor 40A, and 67 is a heat insulating plate that connects the housing. 6
The heat exchanger 7B is interposed between the gas compression pump 70 and the heat radiation heat exchanger 7B, which are incorporated in the heat exchanger 7B.

The gas compression pump 70 has a structure in which the design of the gas compression pump 20 used in the refrigerator is modified in order to increase its capacity. That is, the pump housing has two bellows 7 that are sealed at both end faces to form an air chamber.
1 and 12 are joined together with a disc 73 that can reciprocate in the axial direction while keeping their axes coaxial. Therefore, the disk 73 serves as a sealing member for one end face of each of the bellows 71 and 72. The other end surfaces of the bellows 71 and 72 are sealed by being joined to the inner surfaces of both side walls of a member 74, which is generally upwardly oriented in the shape of a U, and serves as a base for assembling the gas compression pump 70. A reciprocating member 16 having a U-shaped planar shape for reciprocating is attached to the disc 73, and the rotational force of the double-shaft motor 40A is applied to the reduction gears 77 and 78, the crank 79, and the crank pin. It is converted into reciprocating motion via 75 and transmitted to member 76 . In other words, the disk 73 in this set of gas compression pumps 70 is the same as the bellows 22 of the gas compression pump 20.
It will perform a function equivalent to . On both side walls of the member 740 that forms the assembly base of the gas compression pump 70, the bellows 71 and the pipes 6 and 8, which serve as the aforementioned communication passages, are connected to the bellows 71.
and 72 air chambers (cylinder chambers) so as to communicate with each other.

Regarding the operation of the above-mentioned electric fan, whereas the heat exchange means for endothermic absorption as an open cycle in the previously explained refrigerator with a built-in gas refrigerator was the article storage space 9A in the refrigerator, in this embodiment There is no difference at all except that the heat exchange means for endothermic absorption as an open cycle is an indoor space such as the inside of a car where an electric fan is installed. The cold air generated in the cylinder chamber of the other pump of the pair of bellows-type gas compression pumps 70 is sent to the communication path 8 from its discharge port, and is discharged from the pump from the cold air outlet 64 that opens toward the back of the electric fan 61. The air is blown out due to the pressure and is spread toward the space to be cooled along with the air current generated by the electric fan 61. The air that has been heated through heat exchange in this space is pumped to the air intake port 62 by the suction force of one of the pumps.
This cycle of being sucked into the cylinder chamber and being recooled through the process described above repeats thereafter.

An example of the specifications of a prototype electric fan having the same structure as the above embodiment is as follows: The volume of each air chamber (cylinder chamber) of a set of gas compression pumps 70 is 72 cc, and the rotation speed of the double-shaft motor 40A is 1. ．． ooorpm, pump compression ratio 1.2
, the inner diameter of the coiled tube as a heat exchanger for heat dissipation is 6 m, the length is 6 m, and the fan J! The diameter of I machine fan 61 is 5
0mm If the rotation speed is set to 1,800 rpm, the air flow rate is 10 ml/h and the cooling capacity is 10 Ca.
When the ratio was σ/h and the outside temperature was 30°C, the humidity of the blown air could be lowered by about 10°C from the outside temperature. The external dimensions of the fan housing 60 with this specification are 150 x 1
We were able to fit it into an extremely compact size of 50X 150ml.

In both of the above two specific embodiments, an open cycle is adopted in the heat exchange means for heat absorption. It is also free to use it as a heat exchange means.

[Effects of the Invention] The device of the present invention having the above configuration and functioning as a gas refrigerator has a set of reciprocating units that serve as a compressor and an expander, which are part of the components of the gas refrigerator. Since the type gas compression pump is built into a single pump housing with a structure that shares a piston or diaphragm as a reciprocating member for gas compression, the external shape can be made extremely compact. can.

In addition, when a gas refrigerator is incorporated into a refrigerator or an air conditioner, the heat exchange means for absorbing heat as a component of the refrigerator is
Since a so-called open cycle can be constructed in which the internal space of the refrigerator or the indoor space of the air-conditioned room fulfills its role, the overall structure of the apparatus can be simplified as well as the effect of simplifying the lateral pump movement described above.

[Brief explanation of drawings]

FIGS. 1 and 2 are views of a first embodiment of the present invention, illustrating the basic structure and operation thereof, and FIG. 3 is a view of a second embodiment of the present invention. FIGS. 4 to 6 are diagrams showing the overall configuration of the refrigerator, the structure of the gas refrigerator, and the external appearance of the refrigerator, respectively, regarding an embodiment in which the device of the present invention is incorporated into a portable refrigerator. FIGS. 7 and 8 are an explanatory view of the overall configuration and an external view, respectively, showing an embodiment in which the device of the present invention is incorporated into one fan FF. FIG. 9 is a diagram showing the gas temperature to 1 point [1 line diagram] explaining the operating cycle of a gas refrigerator. In the figure A, A', 20.70... 1 set of reciprocating gas compression pumps 1... Pump housing 2... Reciprocating part 41 for gas compression (piston, diaphragm) 4
...Cylinder chamber of one pump 5...Cylinder chamber of the other pump 4A, 4B...Discharge port and suction port of one pump 5A% 5B...Suction port and discharge port of the other pump 6 .8...Communication path between the discharge port and the suction port 7
... Heat exchange means for heat radiation 9 ... Heat exchange means for heat absorption
2a, 14...first valve means 12.13...second
Valve means 5o, 51... Refrigerator insulation box and lid
6o, 61...Fan housing and fan

Claims (1)

[Claims] 1) A set of reciprocating gas compression pumps that share one reciprocating member for gas compression, and a discharge port of one pump and the other pump of the set of gas compression pumps. a heat exchange means for dissipating the heat generated in the adiabatic compression process of one of the pumps, which is provided in a communication path connecting the intake port of the one pump to the other pump of the pair of gas compression pumps; an endothermic heat exchange means provided in a communication path connecting the outlet and the suction port of one of the pumps to utilize cold heat generated in the adiabatic expansion process of the other pump; a first valve means for communicating the discharge port of the one pump with the suction port of the other pump only when the reciprocating member for gas compression occupies a position near the top dead center of the pump; A gas refrigerator comprising: second valve means for communicating the suction port of the one pump with the discharge port of the other pump when the other pump is in a compression process. 2) The gas refrigerator according to claim 1, wherein the endothermic heat exchange means is an open cycle that connects the gas inlet and outlet to the internal space of the refrigerator. 3) The gas refrigerator according to claim 1, wherein the endothermic heat exchange means is an open cycle connecting an air outlet and an inlet of an air conditioner. 4) The gas refrigerator according to claim 3, wherein the air conditioner includes an electric fan housed in a housing having an outlet and an inlet for the open cycle air. 5) The gas refrigerator according to any one of claims 1 to 4, wherein the reciprocating member for compressing gas is a piston or a diaphragm. 6) The gas refrigerator according to any one of claims 1 to 5, wherein the one set of gas compression pumps is incorporated in one pump housing.