JP3263566B2 - Gap heat exchanger for Stirling equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gap type heat exchanger for a Stirling machine which has improved performance of a gap type heat exchanger used for a Stirling machine.

[0002]

2. Description of the Related Art FIG. 7 is a schematic sectional view showing an example of a Stirling apparatus, wherein 1 is a first piston, 2 is a second piston, and 3 is a drive for reciprocating a first piston 1 and a second piston 2. Reference numeral 4 denotes a compression space formed in front of the first piston 1, and reference numeral 5 denotes an expansion space 5 formed in front of the second piston 2.

[0003] Reference numeral 6 denotes a gas flow path for communicating the compression space 4 and the expansion space 5. In this gas flow path 6, a gap type heat exchanger 7 is arranged on the compression space 4 side, while a gas flow path on the expansion space 5 side is provided. A heat regenerator 8 and a heat exchanger 9 are disposed at the bottom. Reference numeral 10 denotes a flow path for back pressure adjustment in the rear space between the first piston 1 and the second piston 2.

First, when the drive unit 3 is driven, the first piston 1 moves to the compression space 4 side, and the hardly liquefiable working gas such as helium or nitrogen filling the compression space 4 is compressed. The compressed working gas is cooled by exchanging heat with the outside air in the gap type heat exchanger 7.

The gap type heat exchanger 7 has a gap portion 13 provided between an outer peripheral wall of a cylinder (inner cylinder) 11 and an inner peripheral wall of an outer hollow cylinder 12 having radiation fins. The heat that passes through is released to the outside.

More specifically, as shown in FIG. 8, the gap type heat exchanger 7 comprises an outer peripheral wall of a cylinder 11 and an outer hollow cylindrical body 1.
By sequentially fitting four support pieces 13a made of a material having good heat conductivity into the gap portion 13 between the inner gasket 2 and the inner peripheral wall, when the working gas passes through the gap portion 13, heat is exchanged between the working gas and the outside air. (A, B, C shown).

Further, the working gas through the gas passage 6 is
It flows into the heat regenerator 8. The working gas that has flowed into the heat regenerator 8 stores heat when passing through the internal filler, and the working gas flows into the expansion space 5.

Thereafter, the second piston 2 in the expansion space 5 descends with a certain phase difference from the first piston 1. As a result, the expansion space 5 is expanded, and the high-pressure working gas flowing from the heat regenerator 8 into the expansion space 5 rapidly expands, and the pressure of the working gas drops rapidly, so that the temperature of the working gas becomes low.

Eventually, the second piston 2 starts to rise,
When the first piston 1 retreats, the low-temperature working gas returns to the compression space 4 through the heat regenerator 8. At this time, the heat regenerator 8
Then, cold heat is stored.

One thermal cycle is completed by the above-described steps, and this step is repeated by the reciprocating motion of the drive unit 3. Thereby, the temperature around the expansion space 5 is gradually lowered.

[0011]

However, the gap type heat exchanger 7 provided in FIG. 7 has a problem that the heat exchange efficiency is extremely low.

That is, in the gap type heat exchanger 7 shown in FIG. 7, the support piece 13a is fitted into the gap 13 between the cylinder 11 and the outer hollow cylinder 12 as shown in FIG. The contact surface of the cylindrical body 12 is formed only by the four support pieces 13a, the heat conduction from the cylinder 11 to the outer hollow cylindrical body 12 is small, and the contact area with the working gas is small.

Therefore, heat release from the outer peripheral wall of the cylinder 11 due to heat conduction is extremely poor, heat release from the working gas to the outside is also poor, and the heat from the working gas passing through the gap 13 to the outside is generally low. There is a problem that the exchange efficiency is poor.

Accordingly, an object of the present invention is to provide a gap type heat exchanger for a Stirling machine which improves heat exchange efficiency and reduces heat loss.

[0015]

According to a first aspect of the present invention, there is provided a gap between an outer peripheral wall of an inner cylindrical body and an inner peripheral wall of an outer hollow cylindrical body having a radiation fin, and a working gas passing through the gap. In a gap type heat exchanger of a Stirling device that exchanges heat with the outside air, a heat conduction good body formed by rounding a corrugated plate body is provided. The contact area with the cylinder is increased, and a ventilation path for the working gas is provided in the gap.

According to a second aspect of the present invention, a gap is provided between the outer peripheral wall of the inner cylindrical body and the inner peripheral wall of the outer hollow cylindrical body having the radiating fins, and the working gas passing through the gap exchanges heat with the outside air. In the gap type heat exchanger of the Stirling apparatus, a plurality of projecting pieces are provided on the outer peripheral wall of the inner cylindrical body, and the plurality of projecting pieces are brought into contact with the inner peripheral wall of the outer hollow cylindrical body. The contact area between the outer cylinder and the outer hollow cylinder is increased, and a ventilation path for the working gas is provided in the gap.

According to a third aspect of the present invention, in the gap type heat exchanger for a stirling apparatus according to the second aspect, a plurality of wavy-shaped projecting pieces formed on the outer peripheral wall of the inner cylindrical body are inclined obliquely from the axial direction of the cylindrical body. It is provided.

[0018]

According to the first aspect of the present invention, when the working gas passes through the ventilation path of the good heat conductive body made of the corrugated plate, the outer hollow cylinder having the radiation fins from the inner cylindrical body via the good heat conductive body. Heat is conducted to the body. In this case, the heat conduction good body has many contact surfaces in the form of a corrugated plate, so that the heat generated in the inner cylinder is favorably conducted to the outer hollow cylinder, and the working gas is favorably conducted to the outside by heat conduction. The heat exchange efficiency is improved.

According to the second aspect of the present invention, the contact area between the plurality of protruding pieces formed to be continuous with the outer peripheral wall of the inner cylindrical body in a wavy manner and the outer hollow cylindrical body is increased, so that heat conduction is improved. The heat exchange efficiency is improved.

According to the third aspect of the present invention, since the projecting pieces formed on the inner cylindrical body are inclined relative to the cylindrical axis direction, the contact area is further increased as compared with the cylindrical axis direction, and the heat exchange efficiency is improved. A high gap heat exchanger is obtained.

[0021]

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

FIG. 1 is an explanatory view of a gap type heat exchanger provided in a Stirling apparatus according to a first embodiment of the present invention.

As shown, the gap type heat exchanger 7A
First, the outer hollow cylinder 12 is inserted into the cylinder (inner cylinder) 11 (illustration A). Subsequently, a plate body is formed by pressing or the like so that the flat plate 14a is continuously formed in a U-shape in a continuous repetition (upper right in FIG. B). Then, a hollow cylindrical heat-conducting good body 14 in which a flat plate 14a is rounded so as to fit into a gap portion 13 formed by the outer hollow cylindrical body 12 and the cylinder 11 is formed (lower right in FIG. B).

Next, the heat-conductive body 14 is connected to the outer hollow cylindrical body 1.
It fits into a gap 13 between the cylinder 2 and the cylinder 11 (illustration C). As a result, the gap type heat exchanger 7A is completed and mounted on a Stirling apparatus as shown in FIG.

Incidentally, as shown in FIG.
Is made by plating copper on an iron plate.
And an inner peripheral wall 12a of the outer hollow cylindrical body 12 are brazed and fixed. In addition, the heat conductive body 14
2 may be a continuous repeating shape of a triangle shown in FIG. 3 instead of a U-shape as shown in FIG. 2, or may be a sinusoidal waveform shown in FIG. In addition, any material can be used as long as a ventilation path for the working gas can be secured.

The heat conduction area between the inner peripheral wall 12a of the outer hollow cylinder 12 of the cylinder 11 and the heat conduction body 14 are greatly increased by the interposition of the heat conduction body 14, and the heat conduction efficiency is greatly improved.

FIG. 5 is an explanatory view of a gap type heat exchanger provided in a Stirling apparatus according to a second embodiment of the present invention.

As shown, the cylinder (inner cylinder) 1
1A, an elongated projecting heat conducting piece 11Aa is formed on the outer peripheral wall in parallel with the cylinder axis direction so as to be continuous with the entire surface of the outer peripheral wall (A right side in the figure). This cylinder 11A is connected to the outer hollow cylinder 1
2 to complete the gap type heat exchanger 7B (illustration B). The gap type heat exchanger 7B is mounted on a Stirling device as shown in FIG. According to this, since the heat conducting pieces 11Aa are connected in a large number of waves, the contact area is large, the heat transfer amount is large, and the efficiency of the heat exchanger is improved.

FIG. 6 shows a third embodiment of the present invention. FIG. 6 shows a cylinder (inner cylinder) having a different outer wall from the cylinder (inner cylinder) 11A of the second embodiment shown in FIG. 11
B.

That is, the illustrated cylinder (inner cylinder)
11B, a heat conductive piece 11Ba of a protruding strip that is slender and oblique to the cylinder axis direction is formed on the outer peripheral wall so as to extend in a wavy manner around the entire circumference. Cylinder 1 on which heat conducting piece 11Ba is formed
1B is inserted into the outer hollow cylinder 12 in FIG. 5 to form a gap type heat exchanger.

According to this configuration, since the surface area with the heat conducting piece 11Ba is larger than the heat conducting piece 11Aa according to the second embodiment, the contact area is increased, and the heat exchange efficiency can be further improved. In addition, a working gas ventilation path can be secured.

[0032]

As described above, according to the first aspect of the present invention, since the good heat conductive member formed by rounding the wavy plate is inserted into the gap, the inner cylindrical member and the outer hollow cylindrical member are formed. The heat conduction area is large, the heat conduction is performed well, and the heat exchange efficiency can be improved.

According to the second aspect of the present invention, since the contact area between the projecting piece formed on the outer peripheral wall of the inner cylindrical body and the outer hollow cylindrical body is large, good heat conduction is achieved, and the heat exchange efficiency is improved. Is improved.

According to the third aspect of the present invention, since the projecting pieces formed on the outer peripheral wall of the inner cylindrical body are inclined in the direction of the cylinder axis, the contact area is further increased as compared with the cylinder axis direction, and A gap type heat exchanger having high exchange efficiency can be obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a gap type heat exchanger showing a first embodiment of the present invention.

FIG. 2 is an explanatory view showing a first example of a heat conductive body provided in the gap type heat exchanger of FIG. 1;

FIG. 3 is an explanatory view showing a second example of a heat conductive body provided in the gap type heat exchanger of FIG. 1;

FIG. 4 is an explanatory view showing a third example of a heat conductive body provided in the gap type heat exchanger of FIG. 1;

FIG. 5 is an explanatory view of a gap type heat exchanger showing a second embodiment of the present invention.

FIG. 6 is an explanatory view of a gap type heat exchanger showing a third embodiment of the present invention.

FIG. 7 is a schematic explanatory view showing a Stirling device including a gap type heat exchanger.

FIG. 8 is an explanatory view showing a conventional gap type heat exchanger.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st piston 2 2nd piston 3 drive part 4 compression space 5 expansion space 6 gas flow path 7, 7A, 7B gap type heat exchanger 8 heat regenerator 9 heat exchanger 10 flow path (for back pressure gas) 11, 11A. 11B Cylinder (inner cylinder) 11Aa, 11Ba Heat conduction piece 12 Outside hollow cylinder 13 Gap 13a Support piece 14 Good heat conduction body 14a Flat plate

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-280815 (JP, A) JP-A-57-12267 (JP, A) JP-A-1-187350 (JP, A) 167974 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F25B 9/14 520 F02G 1/055 F25B 9/00

Claims (3)

(57) [Claims] 1. A gap of a Stirling device in which a gap is provided between an outer peripheral wall of an inner cylindrical body and an inner peripheral wall of an outer hollow cylindrical body having a radiation fin, and heat is exchanged between working gas passing through the gap and outside air. In the heat exchanger, a good heat conductive body formed by rolling a corrugated plate is provided, and the good heat conductive body is inserted into the gap to reduce a contact area between the inner cylindrical body and the outer hollow cylindrical body. A gap type heat exchanger for a Stirling apparatus, wherein the gap type heat exchanger is provided with a working gas ventilation path in the gap. 2. A gap of a Stirling device in which a gap is provided between an outer peripheral wall of an inner cylindrical body and an inner peripheral wall of an outer hollow cylindrical body having a radiation fin, and heat is exchanged between a working gas passing through the gap and outside air. In the heat exchanger, a plurality of protruding pieces are provided on the outer peripheral wall of the inner cylindrical body in a wavy manner, and the plurality of protruding pieces are brought into contact with the inner peripheral wall of the outer hollow cylindrical body to form the inner cylindrical body and the outer side. A gap type heat exchanger for a Stirling device, wherein a contact area with a hollow cylinder is increased, and a working gas ventilation path is provided in the gap. 3. A gap type heat exchanger for a Stirling device according to claim 2, wherein a plurality of wavy projecting pieces formed on the outer peripheral wall of the inner cylindrical body are provided obliquely with respect to the cylinder axis direction.