JP2015021671A - Accumulator and accumulator manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an accumulator capable of reducing dead space and a manufacturing method therefor.SOLUTION: An accumulator 100 arranged between a heating heat exchanger 102 and a cooling heat exchanger 103 within an air-column pipe 101 so as to generate thermal acoustic self-excited vibration in a working fluid loaded in the air-column pipe 101, comprises: a plurality of fine holes 107 formed along an axial direction of the air-column pipe 101; and gaps 108 formed by crossing the fine holes 107. A method of manufacturing the accumulator 100 arranged between the heating heat exchanger 102 and the cooling heat exchanger 103 within the air-column pipe 101 so as to generate thermal acoustic self-excited vibration in a working fluid loaded in the air-column pipe 101, comprises the steps of: etching end portions of accumulator main bodies 109 each including fine holes 107 formed along an axial direction of the air-column pipe 101 so as to leave an outer frame 110; and coupling the accumulator main bodies 109.

Description

  The present invention is disposed inside the air column tube and between the heating side heat exchanger and the cooling side heat exchanger in order to generate thermoacoustic self-excited vibration in the working fluid sealed in the air column tube. The present invention relates to a heat accumulator and a manufacturing method thereof.

  Development of a waste heat regeneration device that uses a thermoacoustic phenomenon in which heat energy and sound energy are mutually converted to enable reuse of low-temperature waste heat that has been wasted has been advanced. Thermoelectric devices such as thermoacoustic engines and thermoacoustic refrigerators are known as this waste heat regeneration device.

  As shown in FIG. 3, the thermoacoustic device 300 includes an air column tube 301 in which a working fluid is sealed, a heating side heat exchanger 302 and a cooling side heat exchanger 303 arranged inside the air column tube 301, A heat accumulator 304 disposed inside the air column tube 301 and disposed between the heating side heat exchanger 302 and the cooling side heat exchanger 303 is provided.

  As shown in FIG. 4, the heating-side heat exchanger 302 and the cooling-side heat exchanger 303 fix a plurality of plates 401 stacked at a sufficiently wide interval to the outer frame 402 so as not to hinder the reciprocating flow of the working fluid. It has a structure. Here, as the plate 401, a thick plate having excellent thermal conductivity is used in order to realize highly efficient heat exchange.

  In contrast, the heat accumulator 304 has a structure in which a plurality of fine holes 403 are formed along the axial direction of the air column tube 301 in order to reduce the flow loss of the working fluid and improve the performance of the thermoacoustic device. (For example, a honeycomb structure).

JP 2004-028389 A JP 2004-188020 A JP 2005-233037 A JP 2006-002599 A

  Therefore, when the heat accumulator 304 is disposed between the heating side heat exchanger 302 and the cooling side heat exchanger 303, both ends of some of the fine holes 403 are blocked by the end surfaces of the plate 401 as shown in FIG. 5. Therefore, there is a risk of generating a space through which the working fluid cannot pass. This space forms a dead space 501 that does not function as the heat accumulator 304 (illustrated satin pattern portion), and the performance of the heat accumulator 304 is significantly deteriorated.

  Accordingly, an object of the present invention is to provide a heat accumulator capable of reducing dead space and a method for manufacturing the same.

  The present invention, which has been created to achieve this object, includes a heating-side heat exchanger inside the air column tube and a heating side heat exchanger in order to generate thermoacoustic self-excited vibration in the working fluid sealed in the air column tube. In the heat accumulator arranged between the cooling side heat exchanger, a plurality of micro holes formed along the axial direction of the air column tube, and a gap formed across the plurality of micro holes, It is a heat accumulator provided with.

  The gap may be formed at a plurality of locations intermittently along the axial direction of the air column tube.

  The gap may have a predetermined width in the axial direction of the air column tube, and the width may be formed to be 1/3 times to 1 time the opening size of the fine hole.

  Further, the present invention provides a thermoacoustic self-excited vibration in the working fluid sealed in the air column tube, and is located inside the air column tube and between the heating side heat exchanger and the cooling side heat exchanger. In the manufacturing method of the regenerator arranged in the step, etching the end of the regenerator main body having a plurality of fine holes formed along the axial direction of the air column tube leaving an outer frame, and a plurality of the above A step of connecting the main body of the regenerator.

  ADVANTAGE OF THE INVENTION According to this invention, the heat storage device which can reduce a dead space, and its manufacturing method can be provided.

It is a figure which shows the thermoacoustic device using the thermal accumulator which concerns on this invention, (a) is sectional drawing in the same position as the AA line of FIG. 3, (b) is a partially expanded view of (a). . (A) And (b) is a figure explaining the manufacturing method of the heat storage apparatus which concerns on this invention. It is the schematic which shows a thermoacoustic device. It is the schematic which shows the cross-section of a heating side heat exchanger, a cooling side heat exchanger, and a thermal storage. It is the sectional view on the AA line of FIG. 3 which shows the thermoacoustic device using the thermal accumulator which concerns on a prior art.

  Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

  As shown in FIG. 1A, the heat accumulator 100 according to the present exemplary embodiment has an internal structure of the air column tube 101 in order to generate thermoacoustic self-excited vibration in the working fluid sealed in the air column tube 101. Therefore, it is disposed between the heating side heat exchanger 102 and the cooling side heat exchanger 103.

  These constitute the thermoacoustic device 104. Here, a case where the thermoacoustic device 104 is a thermoacoustic engine will be described as an example.

  The air column tube 101 is filled with an inert gas such as nitrogen or helium as a working fluid. The heating side heat exchanger 102 and the cooling side heat exchanger 103 have a structure in which a plurality of plates 105 stacked at a predetermined stacking interval are fixed to the outer frame 106. The heating side heat exchanger 102 performs heat exchange using waste heat discharged from the internal combustion engine together with the exhaust gas into the outside air as a heat source, and the cooling side heat exchanger 103 cools cooling water and outside air flowing through the internal combustion engine. Heat exchange is performed as a source. Since these structures are not different from the prior art, description thereof will be omitted.

  In this thermoacoustic device 104, the working fluid is referred to as “compression → heating → expansion → cooling” by using the heating side heat exchanger 102 and the cooling side heat exchanger 103 to give a temperature gradient to the heat accumulator 100. Generate a thermodynamic cycle. Thereby, the recovered waste heat can be used as power.

  Now, the heat accumulator 100 according to the present embodiment includes a plurality of micro holes 107 formed along the axial direction of the air column tube 101, and a gap 108 formed across the plurality of micro holes 107. I have.

  The fine holes 107 are formed at a high density in a heat accumulator body 109 made of ceramics or the like, and the heat accumulator body 109 has a porous structure such as a honeycomb structure with the outer frame 110 remaining. As shown in FIG. 1B in which the portion P in FIG. 1A is enlarged, the opening size D1 of the fine holes 107 is formed sufficiently smaller than the stacking interval D2 of the plates 105, and the flow of the working fluid Loss is reduced so that the performance of the thermoacoustic device 104 can be fully exhibited.

  The gap 108 forms a ventilation channel that communicates the plurality of fine holes 107, and contributes to reducing the dead space 111. The gap 108 is preferably formed at a plurality of locations intermittently along the axial direction of the air column tube 101. Since the gap 108 is formed in at least two places, each of the working fluid flowing from the heating side heat exchanger 102 and the working fluid flowing from the cooling side heat exchanger 103 becomes the dead space 111 through the gap 108. Since the detour channel 112 that flows into the fine hole 107 and flows out again through the original fine hole 107 is formed, most of the fine hole 107 that has become the dead space 111 can function as the heat accumulator 100. Because it becomes.

  In addition, it is possible to completely eliminate the dead space 111 by forming the gap 108 at the boundary between the heating side heat exchanger 102 and the regenerator 100 and the boundary between the cooling side heat exchanger 103 and the regenerator 100. Become.

  The gap 108 has a predetermined width W in the axial direction of the air column tube 101, and the width W is formed to be 1/3 times to 1 time the opening size D1 of the microhole 107. Is preferred. The reason why the lower limit is set to 1/3 is that when the width W is less than 1/3 times the opening size D1, it becomes difficult for the working fluid to flow through the gap 108 into the fine hole 107 that has become the dead space 111. This is because it may not be possible to achieve the purpose of reducing the amount of energy. Further, the upper limit is set to 1 time because the portion where the gap 108 is formed does not function as the heat accumulator 100. Therefore, if the width W exceeds 1 time the opening size D1, the portion that does not function as the heat accumulator 100 is excessive. This is because the performance of the thermoacoustic device 104 may be reduced.

  When manufacturing the regenerator 100, first, as shown in FIG. 2A, first, an end of the regenerator main body 109 having a plurality of fine holes 107 formed along the axial direction of the air column tube 101. Is etched leaving the outer frame 110. As a result, the portion in which the plurality of fine holes 107 are formed is offset inside the heat accumulator body 109 with respect to the outer frame 110. Thereafter, as shown in FIG. 2B, by connecting a plurality of heat accumulator bodies 109, the etched and offset portions form gaps 108. In addition, the gap 108 may be formed by alternately connecting the regenerator body 109 and the spacer.

  As described above, according to the heat accumulator 100 according to the present embodiment, the heat accumulator 100 includes the gap 108 formed across the plurality of fine holes 107, and the working fluid passes through the gap 108 and the dead space 111. Since the detour channel 112 that flows into the fine hole 107 that has been formed is formed, the dead space 111 can be reduced.

  The heat accumulator according to the present invention can be used as a regenerator such as a Stirling engine in addition to a thermoacoustic engine and a thermoacoustic refrigerator.

DESCRIPTION OF SYMBOLS 100 Heat accumulator 101 Air column tube 102 Heating side heat exchanger 103 Cooling side heat exchanger 104 Thermoacoustic device 105 Plate 106 Outer frame 107 Fine hole 108 Gap 109 Regenerator body 110 Outer frame 111 Dead space 112 Detour flow path

Claims (4)

In order to generate thermoacoustic self-excited vibration in the working fluid sealed in the air column tube, the regenerator is disposed inside the air column tube and between the heating side heat exchanger and the cooling side heat exchanger. In
A plurality of micropores formed along the axial direction of the air column tube;
A gap formed across the plurality of micropores;
A heat accumulator characterized by comprising.   The regenerator according to claim 1, wherein the gap is formed at a plurality of locations intermittently along the axial direction of the air column tube.   3. The gap according to claim 1, wherein the gap has a predetermined width in the axial direction of the air column tube, and the width is formed to be 1/3 times to 1 time the opening size of the fine hole. The regenerator described. In order to generate thermoacoustic self-excited vibration in the working fluid sealed in the air column tube, the regenerator is disposed inside the air column tube and between the heating side heat exchanger and the cooling side heat exchanger. In the manufacturing method of
Etching the end of the regenerator body having a plurality of fine holes formed along the axial direction of the air column tube leaving an outer frame;
Connecting a plurality of the regenerator bodies;
A method for manufacturing a heat accumulator, comprising:

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