JP2550248Y2 - Regenerator - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to refrigerating machines applied to Stirling cycle, GM cycle, Solvay cycle, Vermier cycle, etc., and pulse tube refrigerators etc. It is.

[Related Art] A regenerator is provided in a circulation line of a working gas (He or the like) connecting a normal temperature side and a low temperature side of a refrigerator, and cools the cooling gas from a working gas cooled at a low temperature side and sent to a normal temperature side. In addition, it serves to pre-cool the working gas newly sent from the normal temperature side to the low temperature side. (The number of reciprocations of the working gas per time is called an operating frequency). In a conventional regenerator structure, a normal temperature side flow passage hole and a low temperature side flow passage hole are formed in a hollow casing, and an element is filled between these flow passage holes. As the element, a material obtained by knitting a regenerative material such as copper or phosphor bronze into a mesh is often used, and the element is laminated in a casing from a portion facing the normal temperature side channel to a portion facing the low temperature side channel.
Further, when the regenerator is used at a certain operating frequency, the temperature of the gas in the low-temperature side passage when the working gas is sent is T ₁ , and the gas in the low-temperature side passage when the working gas is sent out is T ₁ temperature T ₂ of the, when the temperature of the gas at the room temperature side flow passage constant through these and _{T h, η = (T h} -T 1) / (T h -
Η given by T ₂ ) × 100 is called temperature efficiency, which is a measure of the performance of a regenerator at its operating frequency. Generally, this temperature efficiency η is targeted at 99% or more, and at least 98% or more. Is required. In order to obtain such a high temperature efficiency, conventionally, measures have been taken to increase the heat exchange area by making the mesh finer, and a coarse mesh is used only for the element at the lamination end. The working gas can be dispersed in the plane direction.

[Problem to be Solved by the Invention] However, when the refrigerator is actually operated, the performance of the regenerator often does not always follow the theoretical calculation described above. For example, a regenerator that should have a heat exchange area capable of coping with an operating frequency of 4 Hz or more may have a temperature efficiency that is sharply reduced to about 97% at about 2 to 2.5 Hz. The present inventor conducted experiments to determine frequency efficiency versus temperature characteristics using several types of regenerative materials, and as a result of comparing and examining them, the cause was found to be due to the internal structure of the regenerator and the operation passing through the regenerator. It was concluded that the working gas would not be sufficiently dispersed only by placing the coarse mesh when the gas flow rate was increased, and as a result, the element could only partially function.

The present invention has been made in the above-described manner, and aims at improving the frequency characteristic and enabling use at higher frequencies by devising the internal structure of the regenerator. .

[Means for Solving the Problems] The present invention employs the following structure to achieve the above object.

In other words, the regenerator according to the present invention comprises a hollow body-shaped casing in which a normal temperature side flow path hole and a low temperature side flow path hole are formed, and an element is filled between these flow path holes. A guide groove that is continuous with the flow passage hole is provided on the inner surface of the casing facing the, and the working gas introduced from the flow passage hole can be dispersed along the guide groove throughout the element.

[Action] Conventionally, when the operating frequency is increased, the working gas introduced from the flow passage hole flows in a state close to a jet in a direction corresponding to the opening shape of the flow passage hole, and does not reach the entire element. However, in this case, the working gas introduced into the flow passage hole is prevented from generating a jet in a specific direction by passing through the guide groove, and is dispersed throughout the element so that the entire regenerator can function effectively. , Even if the operating frequency increases,
The required temperature efficiency can be sufficiently ensured.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing the inside of an expansion cylinder 1 of a Stirling refrigerator. A displacer 2 is slidably fitted in the expansion cylinder 1, and an expansion chamber 3 formed on the low temperature end 2a side and a gas port chamber 4 formed on the normal temperature end 2b side.
Are communicated inside the displacer 2 to generate a flow of working gas between the two chambers 3 and 4 together with the sliding operation. Then, while sufficiently compressing the working gas from the gas port chamber 4 into the expansion chamber 3, the working gas is expanded by a compressor or the like (not shown) to obtain cold in the cold head 1a. Repeat the refrigeration cycle of sending to 4.

Then, the regenerator A of the present invention is integrated into the displacer 2. The casing 5 of the regenerator A
A cylindrical side plate 5a, and a top plate 5b covering both ends of the side plate 5a.
And a bottom plate 5c. At the top of the side plate 5a, a low-temperature side flow path hole 6 in the radial direction as shown in FIG. 1 and FIG.
The inside can communicate with the expansion chamber 3. Also, a bent room temperature side flow passage hole 7 as shown in FIG. 1 is formed in the bottom plate 5c, and the inside of the casing 5 can communicate with the gas port 4 through the flow passage hole 7. . And
Between these flow path holes 6 and 7, two types of elements 8a and 8b in which phosphor bronze is woven into a mesh are stacked and arranged. The element 8a arranged at the lamination end has a coarse mesh in order to disperse the flowing working gas in a plane direction, and the element 8b arranged in other parts has a mesh mesh in order to enhance the original cold storage effect. Has been refined.

In such a configuration, the present embodiment also includes guide radial as shown in FIG. 3 the inner surface 5b ₁ of the top plate 5b grooves 9
a and a circumferential guide groove 9b are engraved. Guide groove 9a
Has an opening shape that gradually decreases in width and groove depth from a portion that can be continuous with each flow path hole 6 toward the center, and the guide groove 9b circulates at a constant width and groove depth. Each of the guide grooves 9a has an opening shape that crosses at a substantially intermediate portion.

If the regenerator 4 is provided in such a structure, the working gas introduced from the expansion chamber 3 into the low-temperature side flow passage hole 6 receives the guide action of the guide grooves 9a and 9b and moves in a specific direction. It is difficult to converge, and a flow toward the center and a flow along the circumferential direction are generated, dispersed in a plane, and can uniformly enter the entire area of the element 8a. Also, when the operating frequency increases and the flow velocity increases, their guiding action also increases, so that the dispersion effect becomes more effective. For this reason, even if the illustrated Stirling refrigerator is used at a higher frequency than the conventional one, the normal function of the regenerator A can be ensured, so that it is possible to operate properly with a temperature efficiency close to the theoretical calculation. It becomes. And
Such high-cycle operation improves the refrigerating capacity, and as a result, the size of the refrigerating machine can be reduced, and the deceleration mechanism for driving a compressor or the like connected to the motor is simple. , And can be driven directly by a general-purpose motor.

The shape of the guide groove is not limited to the illustrated example, and may be as shown in FIG. 4 when the casing top plate 5b is provided separately from the side plate 5a. Those shown, engraved spiral groove 10 to gradually reduce toward the center from the portion corresponding to the respective low-temperature side flow passage holes 6 of the top plate inner surface 5b _1, the circumferential direction of the dispersion effect and radially and a dispersion effect It is designed to be played at the same time. Further, such a guide groove may be provided on the inner surface of the bottom plate 5c so as to be continuous with the room temperature side flow passage hole 7. In this case, the working gas introduced from the gas port chamber 4 to the lower end element 8a has a dispersing effect. Can be given. Further, the present invention may of course be used as a stand-alone regenerator, and the application is not limited to the Stirling refrigerator.

[Effects of the Invention] The present invention has a structure in which the working gas introduced from the flow passage hole is dispersed by the guide groove and flows into the element from the entire area, so that the entire regenerator can function effectively.
It is possible to provide a regenerator capable of sufficiently obtaining required temperature efficiency even when the operating frequency is increased, and as a result, capable of effectively improving the refrigerating capacity of the refrigerator.

[Brief description of the drawings]

1 to 3 show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view showing a state where the present invention is applied to a Stirling refrigerator.
The figure is a partially enlarged perspective view showing a low-temperature side flow path hole with a part removed, and FIG. 3 is a perspective view showing an inner surface of a casing provided with a guide groove. FIG. 4 is a perspective view corresponding to FIG. 3 showing another embodiment of the present invention. 5 Casing, 5b ₁ Inner surface 6 Low-temperature channel hole, 7 High-temperature channel hole 8a, 8b Element 9a, 9b, 10 Guide groove

Claims (1)

(57) [Scope of request for utility model registration] 1. A hollow body-like casing having a normal temperature side flow path hole and a low temperature side flow path hole, and an element filled between these flow path holes, wherein at least an inner surface of the casing facing one end of the element. And a guide groove continuous with the flow passage hole, and the working gas introduced from the flow passage hole can be dispersed throughout the element along the guide groove.