JP3679726B2 - Stirling cooling device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a Stirling cooling device using a Stirling refrigerator, and can be used in any industrial field such as food distribution, environmental testing, medical care, bio-industry, semiconductor manufacturing, etc., or any industrial field such as household equipment. More particularly, the present invention relates to a bellows-type tank device for a reservoir of a secondary cold refrigerant circuit.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, systems that use CFCs (single, binary, mixed refrigerants, etc.) as refrigerants are known as refrigeration apparatuses for commercial and household refrigeration related equipment. And refrigeration equipment using HCFC and HFC is known for the recent Freon regulation against the background of global environmental problems.
[0003]
However, the conventional configuration has the following problems. Against the backdrop of full-fledged international efforts to address global environmental issues, there is a trend toward further restrictions on the use of chlorofluorocarbons, including specified chlorofluorocarbons and alternative chlorofluorocarbons, and the need for the development of other types of cooling devices is important. It has become.
[0004]
In addition, conventional cooling devices that use chlorofluorocarbon as a refrigerant have a narrow operating temperature range due to the characteristics of the system. In particular, further development is required to realize the ultra-low temperature range that has been required with the recent technological development in each industrial field. is required.
[0005]
Since the conventional cooling device is a two- or two-stage refrigeration system, the structure is complicated and the cost is high. And it is difficult for the conventional cooling device to perform heating for maintaining constant temperature.
[0006]
In order to solve the problems of these conventional cooling devices, the present inventors have used a wider range of operating temperatures than conventional cooling devices without using chlorofluorocarbons, and therefore, operations such as freezers, refrigerators, throw-in coolers, etc. Refrigerated liquid circulators, low temperature thermostats, thermostats, heat shock test equipment, freeze dryers, temperature characteristics test equipment, blood / cell storage equipment, cold coolers, and other various types A Stirling cooling device that is compact, has a high coefficient of performance, and has good energy efficiency that can be applied to cold energy utilization equipment in various industrial fields such as a cooling device (see Japanese Patent Application Laid-Open No. 11-223404). .
[0007]
[Problems to be solved by the invention]
The secondary refrigeration refrigerant cooled by the cooling head of the Stirling cooling device is sent to the cooling pipe of the chilling equipment through the refrigeration refrigerant pipe, performs a cooling action, and the refrigeration refrigerant circulates again to the cooling head. A closed circuit is constructed. The volume of the cold refrigerant in the circulation path varies due to its contraction and the like, and the pressure in the circulation path varies. For this reason, the cold refrigerant produces an unstable flow or a pulsating flow. This is not preferable from the viewpoint of heat transfer stability. Moreover, it becomes a mechanical load on equipment such as piping constituting the circulation path, causing damage and deterioration.
[0008]
The present invention is intended to solve the above-described problems, and maintains the volume of the cold refrigerant substantially constant with respect to the volume fluctuation due to the shrinkage of the cold refrigerant and the pressure fluctuation in the circulation path. Levels the pressure against fluctuations in pressure in the channel, stabilizes the flow of the cold refrigerant circulating in the circulation path of the cold refrigerant, transfers heat well, and damages equipment such as piping due to mechanical loads It is an object to prevent deterioration and the like.
[0009]
[Means for solving the problems]
In order to solve the above-mentioned problems, the present invention provides a cooling head composed of a cooling head of a Stirling refrigerator, a cold refrigerant pipe having a pump for flowing a cold refrigerant cooled by the cooling head, and a cold refrigerant pipe of a cold energy utilization device. In the Stirling cooling device having a refrigerant circulation path, a bellows tank device having a bellows tank is connected to the cold refrigerant channel, and the bellows tank device is connected to the cold refrigerant through a reservoir tank of the cold refrigerant. Provided is a Stirling cooling device characterized by being connected to a pipe line .
[0010]
In order to solve the above-mentioned problems, the present invention provides a cooling head composed of a cooling head of a Stirling refrigerator, a cold refrigerant pipe having a pump for flowing a cold refrigerant cooled by the cooling head, and a cold refrigerant pipe of a cold energy utilization device. In a Stirling cooling device having a refrigerant circulation path, a bellows-type tank device having a bellows tank is connected to the cold heat refrigerant pipe, and the bellows tank has a valve at the top for supplying cold heat refrigerant. A Stirling cooling device characterized in that a pipe is connected is provided.
[0011]
In order to solve the above-mentioned problems, the present invention provides a cooling head composed of a cooling head of a Stirling refrigerator, a cold refrigerant pipe having a pump for flowing a cold refrigerant cooled by the cooling head, and a cold refrigerant pipe of a cold energy utilization device. In the Stirling cooling device having a refrigerant circulation path, a bellows tank device having a bellows tank is connected to the cold refrigerant channel, and the bellows tank device is connected to the cold refrigerant through a reservoir tank of the cold refrigerant. The bellows tank is connected to a pipe line, and the bellows tank is provided with a Stirling cooling apparatus having a supply pipe for supplying a cold refrigerant having a valve connected to the top.
[0012]
In order to solve the above-mentioned problems, the present invention provides a cooling head composed of a cooling head of a Stirling refrigerator, a cold refrigerant pipe having a pump for flowing a cold refrigerant cooled by the cooling head, and a cold refrigerant pipe of a cold energy utilization device. In a Stirling cooling device having a refrigerant circulation path, a bellows-type tank device having a bellows tank is connected to the cold refrigerant channel, and the bottom portion of the bellows tank is fixed to a support frame and the top portion is supported. A Stirling cooling device is provided, which is slidably attached to a frame, and is connected to a supply pipe for supplying a cold refrigerant having a valve at the top .
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings based on examples. FIG. 1 is a view for explaining a first embodiment of the Stirling cooling apparatus of the present invention. The Stirling cooling device 1 of the first embodiment has a Stirling refrigerator 2. Details of the Stirling refrigerator 2 are described in Japanese Patent Application Laid-Open No. 2000-146340, which is filed by the present applicant, and are omitted here.
[0016]
The Stirling refrigerator 2 has a cooling head 3. The cooling head 3 is connected to a secondary chilled refrigerant line (hereinafter simply referred to as “cold refrigerant line”) 4, and the chilled refrigerant sent through the chilled refrigerant line 4 is cooled by the cooling head 3. . Both ends of the cold-heat refrigerant pipe 4 are connected to an outlet end 7 and an inlet end 8 of a cold-heat refrigerant pipe 6 (a cold-heat exchanger is connected in the middle) of the cold-heating equipment 5 such as a freezer. As a result, a circulation path 9 is formed in which the cooling / cooling refrigerant circulates, which includes the cooling head 3, the cooling / cooling refrigerant pipe 4, and the cooling / heating refrigerant pipe 6 of the cooling / heating utilization device 5.
[0017]
In the middle of the cold heat refrigerant pipe 4, a cold heat refrigerant pump P <b> 1 is disposed, and the cold heat refrigerant is circulated in the circulation path 9. Thereby, the cold refrigerant cooled by the cooling head 3 is sent to the cold utilization equipment 5 such as a freezer through the cold refrigerant line 4.
[0018]
In addition to the freezer, the cold energy utilization device 5 includes a refrigerator, a throw-in cooler, a low-temperature liquid circulator, a low-temperature thermostat for various temperature characteristic tests, a thermostatic bath, a heat shock test device, a freeze dryer, a cold cooler, and the like. Yes, these cold energy utilization devices 5 can be used by connecting them to the cold refrigerant channel 4 of the Stirling refrigerator.
[0019]
As shown in FIG. 1, a bellows-type tank device 12 is connected to an upper side of the inlet of the pump P <b> 1 in the cold heat refrigerant pipe 4 through an on-off valve 11 and a reservoir tank 10. The opening / closing valve is configured such that its opening degree is adjusted as necessary. The bellows tank device 12 is not particularly filled with cold refrigerant, and has a function of adjusting the pressure in the circulation passage 9 of the cold refrigerant that forms a closed circuit via the reservoir tank 10 in use. Have.
[0020]
As shown in FIG. 2, the bellows tank device 12 includes a bellows tank 13 and a support frame 14. The bellows tank 13 is attached in a state where the lower end and the upper end of the bellows 15 are sealed to the bottom plate 16 and the top plate 17, respectively, to form a sealed space. The bottom plate 16 is fixed to the support frame 14 with screws, and the top plate 17 is attached to the support frame 14 on both sides thereof by a sliding support member 18 so as to be vertically slidable. Thereby, the bellows 15 can be expanded and contracted, and the volume of the bellows tank 13 is variable.
[0021]
A cooling refrigerant supply pipe 19 is connected to the bellows tank 13, and a supply opening / closing valve 20 for replenishing the cooling refrigerant is provided in the supply pipe 19. The outlet side of the cooling head 3 of the cold refrigerant line 4 and the cold refrigerant supply pipe 19 are connected by a pipe line 22 via an on-off valve 21. Instead of the on-off valve 21, a configuration through a capillary tube 23 as shown by a dotted line in FIG. The on-off valve 21 is fully closed or set to a certain degree of opening depending on the state of the cold refrigerant during operation. When supplying or filling the cold refrigerant into the cold refrigerant line 4, the refrigerant is opened and used for air bleeding.
[0022]
The supply opening / closing valve 20 is normally closed, but is opened when the cold refrigerant is replenished. As the cryogenic refrigerant, a liquid that can be used in a low temperature region such as ethanol, hydrofluoroether (HFE), polyfluorocarbon (PFC), or the like is used. In addition, as a material of the bellows, rubber, resin, metal material (SUS material, etc.) and the like are used. This bellows material is selected in consideration of the material of the cold refrigerant used.
[0023]
The reservoir tank 10 is disposed above the cold-heat refrigerant pipe 4 and is filled with cold-heat refrigerant, and thereby the liquid pressure is constantly applied to the cold-heat refrigerant pipe 4. In this embodiment, the bellows-type tank device 12 is connected to the inlet side of the pump of the cold / refrigerant refrigerant line 4 via the reservoir tank 10, but may be connected to the outlet side of the pump.
[0024]
The effect | action of this invention by the above structure is demonstrated. When the Stirling refrigerator 2 operates, the cooling head 3 is cooled to a low temperature. In the cooling head 3, the cold refrigerant circulating in the cold refrigerant pipe 4 is cooled. Then, the refrigeration refrigerant cooled in the cooling head 3 is sent from the refrigeration refrigerant pipe 4 to, for example, a refrigeration refrigerant pipe 6 in the refrigeration equipment 5 such as a freezer, and performs refrigeration or cooling action in the refrigeration equipment 5. Do.
[0025]
In the cold energy utilization device 5, the cold refrigerant absorbs heat and performs a cooling action, and returns from the cold refrigerant pipe 6 through the cold refrigerant pipe 4 to the cooling head 3 where it is cooled. As described above, the cold refrigerant circulates in the circulation path 9 including the cooling head 3 of the Stirling refrigerator 2, the cold refrigerant pipe 4, and the cold refrigerant pipe 6 of the cold energy utilization device 5, and cools the cooling head of the Stirling refrigerator 2. Then, the cooling device 5 performs a cooling action.
[0026]
The volume of the refrigeration refrigerant circulating in the circulation path 9 fluctuates due to contraction or the like, and the pressure in the circulation path 9 varies. For this reason, the cold refrigerant generates an unstable flow such as a pulsating flow. This is not preferable from the viewpoint of the stability of heat transfer, and becomes a mechanical load on equipment such as piping constituting the circulation path 9 and causes damage and deterioration.
[0027]
In the present invention, the reservoir tank 10 is filled with the cold refrigerant, and the circulation path 9 is always supplied with a hydraulic pressure so that the cold refrigerant can be supplied. Therefore, the circulation path 9 corresponds to the volume fluctuation due to the shrinkage of the cold refrigerant. The volume of the cold refrigerant inside can be made constant. Furthermore, even if the pressure in the circulation path 9 fluctuates greatly, the bellows 15 expands and contracts in response to this fluctuation. Thereby, the pressure can be leveled against the pressure fluctuation in the circulation path 9.
[0028]
As a result, the flow of the cold refrigerant circulating in the circulation path 9 and the pressure in the circulation path 9 are stabilized, and good heat transfer is possible, and damage such as piping due to mechanical load, deterioration, etc. can be prevented, The lifetime can also be improved.
[0029]
FIG. 3 is a diagram showing a second embodiment of the Stirling cooling apparatus according to the present invention. The second embodiment has substantially the same configuration as that of the first embodiment, except that the reservoir tank 10 in the first embodiment is eliminated and the bellows tank 13 is also used as a reservoir tank and is filled with a cooling refrigerant. This is the configuration. As in the first embodiment, the on-off valve 21 is fully closed or set to a certain degree of opening according to the state of the cold refrigerant during operation. When supplying or filling the cold refrigerant into the cold refrigerant line 4, the refrigerant is opened and used for air bleeding.
[0030]
The embodiments of the present invention have been described based on the examples. However, the present invention is not limited to the above-described examples, and various examples can be made within the scope of the technical matters described in the claims. Needless to say.
[0031]
【The invention's effect】
According to the Stirling cooling apparatus according to the present invention, the following effects can be obtained. That is, the volume of the refrigeration refrigerant in the circulation path fluctuates due to its contraction and the like, and even if the pressure in the circulation path fluctuates, the bellows tank device causes the volume fluctuation or the pressure fluctuation in the circulation path due to the refrigeration of the refrigerant. Maintain the volume of the cold refrigerant, level the pressure against the pressure fluctuation in the circulation path, stabilize the flow of the cold refrigerant circulating in the circulation path of the cold refrigerant, and transfer the heat well At the same time, it is possible to prevent damage and deterioration due to mechanical loads on equipment such as piping.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a first embodiment of a Stirling cooling device according to the present invention.
FIG. 2 is a diagram illustrating a configuration of a bellows tank according to the present invention.
FIG. 3 is a view for explaining a second embodiment of the Stirling cooling apparatus of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Stirling cooling device 2 Stirling refrigerator 3 Cooling head 4 Cold-heat refrigerant pipe 5 Cold-heat utilization equipment 6 Cold-heat refrigerant pipe 7 Outlet end 8 Inlet end 9 Circulation path 10 Reservoir tank 11, 21 On-off valve 12 Bellows-type tank device 13 Bellows tank 14 Support frame 15 Bellows 16 Bottom plate 17 Top plate 18 Sliding support member 19 Supply pipe 20 Supply on / off valve 23 Capillary tube

Claims (4)

In a Stirling cooling apparatus comprising a cooling head of a Stirling refrigerator, a cooling refrigerant pipe having a pump for flowing a cooling refrigerant cooled by the cooling head, and a cooling refrigerant circulation path composed of a cooling refrigerant pipe of a cold energy utilization device ,
A bellows-type tank device having a bellows tank is connected to the cold refrigerant channel ,
The bellows-type tank device is connected to the cold-heat refrigerant pipe line via a cold-heat refrigerant reservoir tank. In a Stirling cooling apparatus comprising a cooling head of a Stirling refrigerator, a cooling refrigerant pipe having a pump for flowing a cooling refrigerant cooled by the cooling head, and a cooling refrigerant circulation path composed of a cooling refrigerant pipe of a cold energy utilization device ,
A bellows-type tank device having a bellows tank is connected to the cold refrigerant channel,
The bellows tank is provided with a Stirling cooling device, wherein a supply pipe for supplying cold refrigerant having a valve is connected to the top . In a Stirling cooling apparatus comprising a cooling head of a Stirling refrigerator, a cooling refrigerant pipe having a pump for flowing a cooling refrigerant cooled by the cooling head, and a cooling refrigerant circulation path composed of a cooling refrigerant pipe of a cold energy utilization device ,
A bellows-type tank device having a bellows tank is connected to the cold refrigerant channel,
The bellows-type tank device is connected to the cold-heat refrigerant pipe line via a cold-heat refrigerant reservoir tank, and the bellows tank is connected to a supply pipe for supplying cold-heat refrigerant having a valve at the top. Stirling cooling device characterized . In a Stirling cooling apparatus comprising a cooling head of a Stirling refrigerator, a cooling refrigerant pipe having a pump for flowing a cooling refrigerant cooled by the cooling head, and a cooling refrigerant circulation path composed of a cooling refrigerant pipe of a cold energy utilization device ,
A bellows-type tank device having a bellows tank is connected to the cold refrigerant channel,
The bellows tank has a bottom portion fixed to a support frame, a top portion which is slidably attached to the support frame, and a supply pipe for supplying cooling / cooling refrigerant having a valve connected to the top portion. A Stirling cooling device.

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