JP5799515B2 - Thermoacoustic refrigeration equipment - Google Patents

Description

  The present invention relates to a thermoacoustic refrigerating apparatus in which insufficient cooling of a cooler heat exchanger due to a circulating gas flow is prevented.

  As shown in FIG. 7, in the thermoacoustic refrigeration apparatus 71, the prime mover 3 and the refrigeration machine 4 are formed in the pipe 2 in which gas is sealed, and when heat from the outside is applied to the prime mover 3, sound waves are generated, The acoustic power of the sonic wave flows into the refrigerator 4 through the pipe 2, and the temperature of the refrigerator 4 is lowered to contribute to the freezing (cooling) of the object.

  The prime mover 3 includes, in the longitudinal direction of the pipe 2, a heating section heat exchanger 5 that performs heat exchange with a heat source that is higher than normal temperature, a normal temperature section heat exchanger 6 that performs heat exchange with a normal temperature heat source, and these heating sections. A regenerator 7 that holds a temperature gradient between the heat exchangers 5 and 6 in the normal temperature section is arranged. In the prime mover 3, the gas in the pipe 2 becomes higher than the normal temperature in the heating part heat exchanger 5 and becomes normal temperature in the normal temperature part heat exchanger 6, thereby forming a temperature gradient in the regenerator 7. Is converted into acoustic energy which is mechanical energy, the gas in the pipe 2 causes self-excited vibration, and acoustic vibration, that is, sound waves are generated in the pipe 2.

  The refrigerator 4 includes, in the longitudinal direction of the pipe 2, a cooler section heat exchanger 8 that extracts heat lower than room temperature, a room temperature section heat exchanger 9 that performs heat exchange with a heat source at room temperature, and the cooler section and room temperature. And a regenerator 10 that maintains a temperature gradient between the heat exchangers 8 and 9. In the refrigerator 4, a cycle similar to the reverse Stirling cycle is performed, and the gas in the cooler heat exchanger 8 becomes lower than room temperature. The object is frozen (cooled) by heat exchange of the low temperature with an external medium.

  In the normal temperature heat exchangers 6 and 9 of the prime mover 3 and the refrigerator 4, the gas temperature is maintained at normal temperature by heat exchange with a heat medium such as cooling water supplied from the outside (not shown).

  The thermoacoustic refrigeration apparatus has various forms in the shape of the pipe 2 and the arrangement of the prime mover 3 and the refrigerator 4.

  In the thermoacoustic refrigeration apparatus 71 of FIG. 7, the pipe 2 forms a single loop, and the prime mover 3 and the refrigerator 4 are respectively arranged at appropriate positions in this loop.

  In the thermoacoustic refrigeration apparatus 81 of FIG. 8, the pipe 2 has a linear shape that connects the motor loop 82 in which the motor 3 is installed, the refrigerator loop 62 in which the refrigerator 4 is installed, and both the loops 82 and 62. Part 63. In the prime mover 3 of the prime mover loop 82, heat energy is converted into acoustic energy, and sound waves are generated, whereby a standing wave is formed over the gas in the entire pipe 2. In the refrigerator loop 62, the acoustic energy is converted into heat energy in the refrigerator 4.

  In the thermoacoustic refrigeration apparatus 91 of FIG. 9, the pipe 2 has only a linear portion and no loop. The prime mover 3 is installed at an appropriate place of the pipe 2, and the refrigerator 4 is installed at another appropriate place.

  In the thermoacoustic refrigeration apparatus 101 of FIG. 10, the pipe 2 has a refrigerator loop 62 in which the refrigerator 4 is installed, and a linear portion 63 connected to the refrigerator loop 62. The prime mover 3 is installed on the linear portion 63.

  In the thermoacoustic refrigeration apparatus 101 of FIG. 11, the pipe 2 has a prime mover loop 82 in which the prime mover 3 is installed, and a linear portion 63 connected to the prime mover loop 82. The refrigerator 4 is installed in the linear portion 63.

JP 2011-2153 A JP 2006-214406 A

  By the way, in the conventional thermoacoustic refrigeration apparatuses 71, 81, 91, 101, and 111, the enclosed gas can move and circulate in the pipe 2. For this reason, the gas (cold air) which became low temperature in the cooler part heat exchanger 8 diffuses and leaves | separates from the cooler part heat exchanger 8, and the problem that the temperature of the cooler part heat exchanger 8 does not fall easily arises.

  In the pipe 2 shown in FIG. 12, the gas moves from the cooler section heat exchanger 8 of the refrigerator 4 through the regenerator 10 and the room temperature section heat exchanger 9 to the motor 3 through the loop. Further, the gas moves from the heating part heat exchanger 5 of the prime mover 3 through the regenerator 7 and the normal temperature part heat exchanger 6 to the refrigerator 4 through the loop. As a result, a circulating flow along the loop is generated.

  In the pipe 2 shown in FIG. 13, the gas flows from the cooler section heat exchanger 8 of the refrigerator 4 to the refrigerator loop 62 and moves with the normal temperature section heat exchanger 9, the regenerator 10, and the cooler section heat exchanger 8. . As a result, a circulating flow along the refrigerator loop 62 is generated.

  In a part of the pipe 2 shown in FIG. 14, in the vicinity of the cooler section heat exchanger 8 of the refrigerator 4, the gas at the center of the pipe 2 moves in a direction away from the cooler section heat exchanger 8, and the cooler section It moves from the heat exchanger 8 to an indefinite long section. The gas in the periphery of the pipe 2 moves in a direction approaching the cooler heat exchanger 8 over this indefinite long section. As a result, a circulating flow whose direction is opposite between the central portion and the peripheral portion of the pipe 2 is generated.

  In the thermoacoustic refrigeration apparatus of FIGS. 7 to 11, those having a loop generate a circulating flow around the loop as shown in FIG. 12 or 13 in the loop, and a part of the pipe 2 regardless of the presence or absence of the loop. Thus, a circulating flow as shown in FIG. 14 is generated.

  Then, the objective of this invention is providing the thermoacoustic refrigeration apparatus which solves the said subject and prevents insufficient cooling of the cooler part heat exchanger by the circulation flow of gas.

  In order to achieve the above object, the apparatus of the present invention is configured such that a prime mover and a refrigerator are formed in a gas-sealed pipe, and the prime mover is a heating unit heat exchanger that performs heat exchange with a heat source higher than room temperature, A normal temperature part heat exchanger that performs heat exchange with a normal temperature heat source, and a regenerator that maintains a temperature gradient between the heating part and the normal temperature part heat exchanger are arranged in the longitudinal direction of the pipe, A refrigerator has a temperature gradient between a cooler section heat exchanger that extracts heat below room temperature, a room temperature section heat exchanger that performs heat exchange with a room temperature heat source, and a heat exchanger between the cooler section and the room temperature section. A regenerator to be held is arranged in the longitudinal direction of the pipe, and a blocking wall that blocks moving gas at a position facing the refrigerator in the pipe from the cooler heat exchanger side is a gas. It is installed so that it can vibrate with the vibration of .

  The blocking wall may be installed at a position where the distance from the cooler heat exchanger is more than half the maximum amplitude of the blocking wall and closer to five times the maximum amplitude of the blocking wall.

  The pipe may include a refrigerator loop in which the refrigerator is disposed and a linear portion connected to the refrigerator loop, and the blocking wall may be installed in the refrigerator loop.

  The present invention exhibits the following excellent effects.

  (1) Insufficient cooling of the cooler heat exchanger due to the circulating gas flow is prevented.

It is a block diagram of the thermoacoustic refrigeration apparatus which shows one Embodiment of this invention. It is an enlarged view of the refrigerator vicinity of the thermoacoustic refrigeration apparatus of this invention. It is sectional drawing of the interruption | blocking wall used for the thermoacoustic refrigeration apparatus of this invention. It is sectional drawing of the interruption | blocking wall used for the thermoacoustic refrigeration apparatus of this invention. It is sectional drawing of the interruption | blocking wall used for the thermoacoustic refrigeration apparatus of this invention. It is a partial block diagram of the thermoacoustic refrigeration apparatus which shows other embodiment of this invention. It is a block diagram of the conventional thermoacoustic refrigeration apparatus. It is a block diagram of the conventional thermoacoustic refrigeration apparatus. It is a block diagram of the conventional thermoacoustic refrigeration apparatus. It is a block diagram of the conventional thermoacoustic refrigeration apparatus. It is a block diagram of the conventional thermoacoustic refrigeration apparatus. It is a block diagram of the thermoacoustic refrigeration apparatus which shows the circulation flow around a loop. It is a partial block diagram of the thermoacoustic refrigeration apparatus which shows the circulation flow which goes around a refrigerator loop. It is an enlarged view of the refrigerator vicinity of the thermoacoustic refrigeration apparatus showing a circulating flow in a part of a pipe.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  As shown in FIG. 1, a thermoacoustic refrigeration apparatus 1 according to the present invention is configured such that a prime mover 3 and a refrigerator 4 are formed in a pipe 2 in which a gas is sealed. The prime mover 3 includes a heating section heat exchanger 5 that performs heat exchange with a heat source that is higher than normal temperature, a normal temperature section heat exchanger 6 that performs heat exchange with a normal temperature heat source, and a heat exchanger for the heating section and the normal temperature section. A regenerator 7 that maintains a temperature gradient between 5 and 6 is arranged in the longitudinal direction of the pipe 2. The refrigerator 4 includes a cooler section heat exchanger 8 that extracts heat lower than room temperature, a room temperature section heat exchanger 9 that performs heat exchange with a heat source at room temperature, and a space between the cooler section and the room temperature section heat exchanger 8. , 9 and the regenerator 10 that maintains the temperature gradient are arranged in the longitudinal direction of the pipe 2.

  There are various forms of the shape of the pipe 2 and the arrangement of the prime mover 3 and the refrigerator 4 as described above. In this embodiment, the pipe 2 forms a single loop, and the prime mover is included in this loop. 3 and the refrigerator 4 are arranged at an appropriate interval.

  Since the heating part heat exchanger 5, the normal temperature part heat exchanger 6 and the regenerator 7 constituting the prime mover 3 are known ones, detailed description thereof will be omitted. Since the cooler part heat exchanger 8, the normal temperature part heat exchanger 9, and the regenerator 10 which comprise the refrigerator 4 are well-known things, detailed description is abbreviate | omitted.

  In the thermoacoustic refrigeration apparatus 1 of the present invention, a blocking wall 11 for blocking gas can vibrate in association with gas vibration at a position facing the refrigerator 4 in the pipe 2 from the cooler part heat exchanger 8 side. It is characterized by being installed.

  The blocking wall 11 is preferably installed at a position where the distance from the cooler heat exchanger 8 is far from half the maximum amplitude of the blocking wall 11 and closer to five times the maximum amplitude of the blocking wall 11.

  Next, the operation of the thermoacoustic refrigeration apparatus 1 will be described.

  As shown in FIG. 2, a blocking wall 11 is installed at a predetermined distance from the cooler heat exchanger 8. In the pipe 2 on the cooler section heat exchanger 8 side of the blocking wall 11, the gas at the center of the pipe 2 tries to move away from the cooler section heat exchanger 8, but is blocked by the blocking wall 11. Then, it has no choice but to return to the cooler heat exchanger 8 through the periphery of the pipe 2. Therefore, the circulation flow over the indefinite long section as described in FIG. 14 does not occur. Only in a narrow section sandwiched between the blocking wall 11 and the cooler heat exchanger 8, a reverse circulation flow is generated at the center and the periphery of the pipe 2, but this is negligible, and the cooler heat exchanger 8 The cold air does not diffuse before the blocking wall 11 and is substantially kept in the vicinity of the cooler heat exchanger 8.

  At the same time, the circulating flow along the loop as described in FIGS. 12 and 13 is not generated in the thermoacoustic refrigeration apparatus 1 of FIG. That is, there is no diffusion of cool air in the cooler heat exchanger 8 due to the circulating flow along the loop.

  As described above, in the thermoacoustic refrigerating apparatus 1 of the present invention, neither the circulation flow over the indefinite long section that is reversed between the center portion and the peripheral portion of the pipe 2 nor the circulation flow along the loop is generated. The gas that has become low temperature in the cooler 8 is retained in the vicinity of the cooler heat exchanger 8. Thereby, the temperature of the cooler part heat exchanger 8 falls well than before, and the refrigeration performance of the thermoacoustic refrigeration apparatus 1 is improved.

  On the other hand, the blocking wall 11 is installed so as to be able to vibrate accompanying the vibration of the gas. In the example of FIG. 2, the blocking wall 11 can vibrate from the displacement position −P1 to the displacement position + P1 around the neutral position P0. The distance from the displacement position −P1 to the displacement position + P1 is the maximum amplitude of the blocking wall 11. As described above, since the shielding wall 11 can vibrate accompanying the vibration of the gas, the vibration of the gas, that is, the sound wave, is not obstructed by the shielding wall 11 and proceeds substantially through the shielding wall 11. can do.

  Next, the optimum position where the blocking wall 11 is installed is examined.

  As can be seen from the principle described with reference to FIG. 2, the circulating flow along the loop is prevented regardless of the position of the blocking wall 11. Regarding the circulating flow around the center and the periphery of the pipe 2, the closer the position of the blocking wall 11 is to the cooler heat exchanger 8, the smaller the circulating flow and the smaller the diffusion of cool air. However, since the blocking wall 11 should not vibrate and interfere with the cooler heat exchanger 8, the position closest to the cooler heat exchanger 8 is half the maximum amplitude of the blocking wall 11. The farther the position of the blocking wall 11 is from the cooler heat exchanger 8, the greater the circulation flow and the greater the diffusion of cold air. In order to obtain the expected effect, the position of the blocking wall 11 is desirably a position closer to 5 times the maximum amplitude of the blocking wall 11 from the cooler part heat exchanger 8, and as it approaches 2 times or 1 times the maximum amplitude. Preferred. The optimum position is a position that is half the maximum amplitude from the cooler section heat exchanger 8 where the diffusion of the cold air is minimized.

  Next, the configuration of the blocking wall 11 will be examined.

  3, the peripheral part of the blocking wall 11 is fixed to the inner wall of the pipe 2, and the central part of the blocking wall 11 vibrates in the longitudinal direction of the pipe 2 so as to be in the state of a broken line and a two-dot chain line. It is designed to deform. The blocking wall 11 is preferably airtight so that gas does not leak to the opposite side, and has flexibility (elasticity) that allows the central portion to vibrate in the longitudinal direction while the peripheral portion is fixed. The blocking wall 11 is formed to be relatively thin and can be referred to as a vibrating membrane. Examples of the material of the blocking wall 11 include metal, glass, ceramics, resin, rubber, and fiber.

  In the blocking wall 11 shown in FIG. 4, the peripheral part of the blocking wall 11 is fixed to the inner wall of the pipe 2, the central part of the blocking wall 11 is configured by a bellows, and the central part of the blocking wall 11 is in the longitudinal direction of the pipe 2. It vibrates and deforms into a broken line and a two-dot chain line. Examples of the material of the blocking wall 11 include metal, glass, ceramics, resin, rubber, and fiber.

  The blocking wall 11 shown in FIG. 5 includes a piston 51 and a spring member 52. The piston 51 is spring-supported so that its peripheral portion is slidable with respect to the inner wall of the pipe 2 and is movable in the longitudinal direction of the pipe 2 by a spring member 52 such as a spiral ring. As indicated by a broken line and a two-dot chain line, the piston 51 reciprocates in the longitudinal direction of the pipe 2 and vibrates. A seal is provided between the periphery of the piston 51 and the inner wall of the pipe 2 so as not to leak gas, and lubricity is imparted to reduce sliding resistance. The piston 51 is made of a rigid body that is unlikely to be partially deformed. The piston 51 includes two piston heads 53 that are arranged apart from each other in the longitudinal direction of the pipe 2, and a piston rod 54 that connects the two piston heads 53. The spring member 52 holds the piston rod 54 at the center axis position of the pipe 2 and supports the spring in the longitudinal direction. Due to such a structure, the entire barrier wall 11 is virtually replaced with a rigid barrier wall 11 having a larger thickness than the barrier wall 11 shown in FIGS. be able to. Examples of the material of the piston 51 include metal, glass, ceramics, resin, rubber, and fiber.

  Next, another embodiment of the present invention will be described.

  As shown in FIG. 6, in the thermoacoustic refrigerating apparatus 61 of the present invention, the pipe 2 includes a refrigerating machine loop 62 in which the refrigerating machine 4 is disposed, and a refrigerating machine loop 62, as in the configurations of FIGS. 8 and 10. And a linear portion 63 connected to the. The blocking wall 11 is installed in the refrigerator loop 62. If the blocking wall 11 is installed in the linear portion 63, a circulating flow along the refrigerator loop 62 as described with reference to FIG. 13 is generated. On the other hand, when the blocking wall 11 is installed in the refrigerator loop 62, the circulation flow along the refrigerator loop 62 is prevented.

  In the thermoacoustic refrigeration apparatus 61 in which the linear portion 63 is connected to the refrigerator loop 62, the blocking wall 11 is installed on the side closer to the cooler heat exchanger 8 than the connection portion between the refrigerator loop 62 and the linear portion 63. Thus, both the circulating flow along the refrigerator loop 62 and the circulating flow around the central portion and the peripheral portion of the pipe 2 are prevented.

  The present invention is limited to the thermoacoustic refrigeration apparatus 1 in which the pipe 2 forms a single loop as shown in FIG. 1 and the thermoacoustic refrigeration apparatus 61 having the refrigerator loop 62 and the linear portion 63 as shown in FIG. Absent. The present invention can also be applied to thermoacoustic refrigeration apparatuses 91 and 111 in which the refrigerator 4 is installed in the linear portion 63 as shown in FIG. 9 or FIG.

DESCRIPTION OF SYMBOLS 1,61 Thermoacoustic refrigeration equipment 2 Pipe 3 Primer 4 Refrigerator 5 Heating part heat exchanger 6 Normal temperature part heat exchanger 7 Regenerator 8 Cooler part heat exchanger 9 Normal temperature part heat exchanger 10 Regenerator 11 Shut-off wall 62 Refrigerator Loop 63 linear part

Claims (2)

A prime mover and a refrigerator are formed in a pipe filled with gas,
The prime mover includes a heating unit heat exchanger that exchanges heat with a heat source that is higher than normal temperature, a normal temperature unit heat exchanger that performs heat exchange with a normal temperature heat source, and a heat exchanger between the heating unit and the normal temperature unit. A regenerator for maintaining a temperature gradient is arranged in the longitudinal direction of the pipe,
The refrigerator has a temperature gradient between a cooler part heat exchanger that extracts heat lower than normal temperature, a normal temperature part heat exchanger that performs heat exchange with a normal temperature heat source, and a heat exchanger between the cooler part and the normal temperature part. And a regenerator for holding the pipe is arranged in the longitudinal direction of the pipe,
At the position facing the cooler part heat exchanger side with respect to the refrigerator in the pipe, a blocking wall for blocking the moving gas is installed so as to be able to vibrate accompanying the vibration of the gas,
The thermoacoustic refrigeration apparatus characterized in that the barrier wall is disposed adjacent to the optimum position at a distance from the cooler section heat exchanger that is farther than an optimum position where the distance is half the maximum amplitude of the shield wall. . A prime mover and a refrigerator are formed in a pipe filled with gas,
The prime mover includes a heating unit heat exchanger that exchanges heat with a heat source that is higher than normal temperature, a normal temperature unit heat exchanger that performs heat exchange with a normal temperature heat source, and a heat exchanger between the heating unit and the normal temperature unit. A regenerator for maintaining a temperature gradient is arranged in the longitudinal direction of the pipe,
The refrigerator has a temperature gradient between a cooler part heat exchanger that extracts heat lower than normal temperature, a normal temperature part heat exchanger that performs heat exchange with a normal temperature heat source, and a heat exchanger between the cooler part and the normal temperature part. And a regenerator for holding the pipe is arranged in the longitudinal direction of the pipe,
At the position facing the cooler part heat exchanger side with respect to the refrigerator in the pipe, a blocking wall for blocking the moving gas is installed so as to be able to vibrate accompanying the vibration of the gas,
The thermoacoustic refrigeration apparatus, wherein the blocking wall is installed at an optimal position where a distance from the cooler heat exchanger is half the maximum amplitude of the blocking wall.