Member for gas-liquid heat exchanger, gas-liquid heat exchanger and method for manufacturing member for gas-liquid heat exchanger

Abstract

To provide a gas-liquid heat exchanger suitable for heat transport using thermoacoustic self-excited vibration.SOLUTION: A member 1 for a gas-liquid heat exchanger includes a body part 11 in which heat is exchanged between air introduced to inside and liquid introduced to inside, and the body part 11 has a shape of an approximately columnar body that has a first bottom surface 111 and a second bottom surface 112 disposed approximately in parallel with each other and that includes a plurality of holes 113 linearly communicating both of the bottom surfaces with each other. Gas G is introduced to the plurality of holes 113, and the plurality of holes are provided approximately in parallel in the height direction of the body part 11 (first direction D1) and are provided to form a plurality of rows along a predetermined direction approximately orthogonal to the first direction (second direction D2). The body part 11 has a shape including a plurality of slits 118 to which liquid is introduced. The slits 118 are linearly provided between the plurality of rows from one end side of the row in the body part 11 to the other end of the row of the body part 11 so as not to intersect with the holes 113.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a gas-liquid heat exchanger member, a gas-liquid heat exchanger, and a method for manufacturing a gas-liquid heat exchanger member. [Background technology]

[0002] In order to improve safety and cost-effectiveness in heat transport from high-temperature industrial furnaces, a technology has been proposed (Patent Document 1) in which the high-temperature side heat exchanger is configured as a pin-type heat exchanger with a rod-shaped heat receiving part formed integrally with the base in a thermoacoustic device in which a heat accumulator arranged in a pipe is sandwiched between a high-temperature side heat exchanger (first heat exchanger) and a low-temperature side heat exchanger (second heat exchanger).The technology described in Patent Document 1 can improve the amount of heat transport in heat transport using thermoacoustic self-excited vibrations. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 7270144 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, Patent Document 1 discloses that the high-temperature side heat exchanger is a pin-type heat exchanger suitable for heat transport using thermoacoustic self-excited oscillations, but only indicates the use of conventional technology, stating that the low-temperature side heat exchanger is "preferably a shell-and-tube gas-liquid heat exchanger." Therefore, Patent Document 1 leaves room for further improvement in terms of configuring the low-temperature side heat exchanger of the thermoacoustic device to be suitable for heat transport using thermoacoustic self-excited oscillations.

[0005] An object of the present invention is to provide a gas-liquid heat exchanger suitable for heat transport using thermoacoustic self-excited vibrations. [Means for solving the problem]

[0006] The present inventors conducted extensive research to solve the above problems, and discovered that the above object can be achieved by forming a columnar body of a gas-liquid heat exchanger, providing a plurality of rows of holes that connect the body in the height direction, and slits that connect the body between these rows but do not intersect with the holes, so that heat exchange occurs between the gas introduced into the holes and the liquid introduced into the slits, and by smoothing the inner surfaces of these holes, etc., which led to the completion of the present invention. Specifically, the present invention provides the following.

[0007] The invention according to a first aspect of the present invention provides a member for an air-liquid heat exchanger, comprising: a main body portion in which heat exchange takes place between a gas introduced therein and a liquid introduced therein; the main body portion has a generally cylindrical shape with one bottom surface and another bottom surface that are generally parallel to each other; and the main body portion has a shape in which a plurality of holes are provided that linearly connect the one bottom surface to the other bottom surface; the plurality of holes are provided so as to allow the gas to be introduced and are arranged generally parallel to the height direction of the main body portion and to form a plurality of rows along a predetermined direction that is generally perpendicular to the height direction; the inner surfaces of the holes have a smooth cylindrical shape that does not substantially impede the vibration of the gas when the gas is introduced therein; the main body portion has a shape in which a plurality of slits are provided through which the liquid is introduced; the slits are arranged linearly between the plurality of rows, from one end of the rows in the main body portion to the other end of the rows in the main body portion, so as not to intersect with the holes.

[0008] In conventional gas-liquid heat exchangers, turbulence is created in the gas-side flow path to promote gas heat exchange. On the other hand, in heat exchangers for thermoacoustic devices, which utilize the thermoacoustic phenomenon caused by oscillating flow in the working fluid due to self-excited vibrations, it is important that the oscillating flow in the working fluid is not obstructed in order to improve the efficiency of generating and utilizing the oscillating flow in the thermoacoustic device. Therefore, a configuration that does not create turbulence in the gas working fluid is desirable for heat exchangers for thermoacoustic devices.

[0009] In this invention, multiple holes through which gas is introduced are provided so as to linearly connect from one bottom surface to the other bottom surface of the roughly cylindrical main body. This allows the gas-liquid heat exchanger component of this invention to be placed inside the tube of a thermoacoustic device so that the axial direction of the thermoacoustic device and the bottom surfaces of the main body are roughly perpendicular. This prevents the oscillatory flow along the axial direction from becoming uneven at each bottom surface, forming turbulence and impeding the oscillatory flow. Furthermore, this invention also prevents the formation of turbulence within the holes, which serve as the gas-side flow path, by having the inner surfaces of the multiple holes be smooth and cylindrical, which does not substantially impede the vibrations of the gas introduced therein.

[0010] This invention compensates for the reduced heat exchange efficiency caused by the lack of turbulence in the holes, which are the gas-side flow passages, by using the dream pipe effect associated with oscillating flow. The dream pipe effect is an effect in which the effective thermal conductivity of the working fluid inside the flow passage becomes higher than the original thermal conductivity of the working fluid due to vibrations along the flow passage. As a result, this invention achieves effective heat exchange despite being configured to avoid turbulence, which is the exact opposite of conventional heat exchangers for use in thermoacoustic devices.

[0011] In order to effectively utilize the dream pipe effect, the flow path must be narrow enough to correspond to the frequency of the self-excited vibration. This invention uses a unique configuration in which slits are provided between rows of holes to serve as the flow path for introducing liquid, making it easy to provide a liquid-side flow path even when the holes for introducing gas are narrow.

[0012] As described above, the present invention can provide a gas-liquid heat exchanger suitable for heat transport using thermoacoustic self-excited vibrations.

[0013] A second aspect of the present invention provides a member for an air-liquid heat exchanger, which is the first aspect of the invention, wherein the plurality of holes have inner surfaces that are smoothed by wire electric discharge machining.

[0014] When the hole through which the gas is introduced is narrowed to effectively achieve heat exchange via the dream pipe effect, it is difficult to machine the inner surface of the hole into a smooth columnar shape. This invention makes it possible to machine the inner surface of the hole into a smooth columnar shape using wire electric discharge machining, even when the hole through which the gas is introduced is narrow. As a result, this invention achieves both a smooth columnar shape for the inner surface of a narrow hole that effectively achieves the dream pipe effect, substantially not impeding the vibration of the gas, and effective heat exchange via the dream pipe effect.

[0015] As described above, the present invention can provide a gas-liquid heat exchanger suitable for heat transport using thermoacoustic self-excited vibrations.

[0016] A third aspect of the present invention provides a member for an air-liquid heat exchanger according to the first or second aspect of the invention, wherein the plurality of slits have inner surfaces smoothed by wire electric discharge machining.

[0017] In the low-temperature heat exchanger for a thermoacoustic device, the working fluid side flow path must have a high aperture ratio so as not to impede the oscillating flow. Additionally, the working fluid side flow path of the low-temperature heat exchanger for a thermoacoustic device must have narrow holes to effectively utilize the dream pipe effect. Configuring the row of holes to satisfy these conditions narrows the slit width. Meanwhile, in the low-temperature heat exchanger for a thermoacoustic device, it is necessary to minimize pressure loss in the liquid side flow path and stabilize the temperature of the cooling liquid in order to stabilize the temperature ratio on both sides of the regenerator.

[0018] This invention uses wire electric discharge machining to smooth the inner surface of the slit through which the liquid is introduced. As a result, this invention can reduce pressure loss in the liquid-side flow path and stabilize the temperature of the cooling liquid, even if the slit is narrow, thanks to a configuration that takes into account the aperture ratio of both bottom surfaces and the dream pipe effect.

[0019] As described above, the present invention can provide a gas-liquid heat exchanger suitable for heat transport using thermoacoustic self-excited vibrations.

[0020] A fourth aspect of the present invention provides an air-liquid heat exchanger comprising: an air-liquid heat exchanger element according to any one of the first to third aspects; and a hollow shell accommodating the air-liquid heat exchanger element, wherein the shell accommodates the air-liquid heat exchanger element so as not to block at least a portion of the holes on both the one bottom surface and the other bottom surface of the main body and not to block at least a portion of the slits on both the one end side and the other end side of the main body, the shell has a plurality of openings communicating between the inside and the outside of the shell along the predetermined direction, at least a portion of the plurality of openings being provided on the same side as the one end side when viewed from the center of the air-liquid heat exchanger element, and at least a portion of the plurality of openings being provided on the same side as the other end side when viewed from the center of the air-liquid heat exchanger element.

[0021] The invention reduces pressure loss when the cooling liquid passes from one end of the shell exterior through the slit to the other end of the shell exterior by devising an orientation in which the opening is provided, thereby reducing pressure loss in the liquid-side flow path and stabilizing the temperature of the cooling liquid.

[0022] As described above, the present invention can provide a gas-liquid heat exchanger suitable for heat transport using thermoacoustic self-excited vibrations.

[0023] A fifth aspect of the present invention is a method for manufacturing a member for an air-liquid heat exchanger, comprising: an opening step for opening a plurality of holes linearly connecting from the one bottom surface to the other bottom surface and slits that do not intersect with the holes in a material for a main body that is approximately cylindrical in shape and has one bottom surface and another bottom surface that are approximately parallel to each other; and a smoothing step for smoothing the inner surfaces of the holes; wherein in the opening step, the plurality of holes are opened approximately parallel to the height direction of the main body, and are opened to form a plurality of rows along a predetermined direction that is approximately perpendicular to the height direction, and the slits are opened linearly between the plurality of rows from one end side of the rows in the main body toward the other end side of the rows in the main body, so as not to intersect with the holes.

[0024] This invention makes it possible to provide an air-liquid heat exchanger component according to the first to third features, even when multiple holes are configured as thin holes to effectively exert the dream pipe effect, by smoothing the inside of the pilot holes opened in the opening process using wire electric discharge machining or the like.

[0025] As described above, the present invention can provide a gas-liquid heat exchanger suitable for heat transport using thermoacoustic self-excited vibrations. [Effects of the Invention]

[0026] As described above, the present invention can provide a gas-liquid heat exchanger suitable for heat transport using thermoacoustic self-excited oscillations. [Brief explanation of the drawings]

[0027] [Figure 1] FIG. 1 is an isometric view of a gas-liquid heat exchanger E of this embodiment. [Figure 2] FIG. 2 is an isometric view of the gas-liquid heat exchanger component 1 of FIG. [Figure 3] FIG. 3 is a top view of the gas-liquid heat exchanger member 1 of FIG. [Figure 4] FIG. 4 is a front view of the gas-liquid heat exchanger member 1 of FIG. [Figure 5] FIG. 5 is a right side view of the gas-liquid heat exchanger member 1 of FIG. [Figure 6] FIG. 6 is a front view of the gas-liquid heat exchanger E of FIG. [Figure 7] FIG. 7 is a flowchart showing an example of a preferable flow of the method for manufacturing the gas-liquid heat exchanger E according to this embodiment. [Figure 8] FIG. 8 is a schematic diagram of a thermoacoustic device T to which the gas-liquid heat exchanger E of this embodiment is attached. DETAILED DESCRIPTION OF THE INVENTION

[0028] An example of a preferred embodiment of the present invention will be described below with reference to the drawings. Note that this is merely an example, and the technical scope of the present invention is not limited to this example.

[0029] 1 is an isometric view of the gas-liquid heat exchanger E of this embodiment. The following is an example of a preferred embodiment of the gas-liquid heat exchanger E of this embodiment using FIG.

[0030] [Gas-liquid heat exchanger E] The gas-liquid heat exchanger E includes a gas-liquid heat exchanger member 1 and a shell 2. The shell 2 houses the gas-liquid heat exchanger member 1 so as not to block at least some of the holes 113 on both bottom surfaces of a main body 11 of the gas-liquid heat exchanger member 1, which will be described later.

[0031] [Gas-liquid heat exchanger components 1] Fig. 2 is an isometric projection view of the gas-liquid heat exchanger member 1 of Fig. 1. Fig. 3 is a top view of the gas-liquid heat exchanger member 1 of Fig. 2. Fig. 4 is a front view of the gas-liquid heat exchanger member 1 of Fig. 2. Fig. 5 is a right side view of the gas-liquid heat exchanger member 1 of Fig. 2. The following is an example of a preferred embodiment of the gas-liquid heat exchanger member 1 of this embodiment, using Figs. 2 to 5.

[0032] (Main body 11) The main body 11 is a member in which heat exchange occurs between the gas G introduced therein and a liquid (not shown) introduced therein. The main body 11 has a generally cylindrical shape having one bottom surface (e.g., a first bottom surface 111) and another bottom surface (e.g., a second bottom surface 112) that are generally parallel to each other, and is provided with a plurality of holes 113 that linearly communicate from the first bottom surface 111 to the second bottom surface 112.

[0033] The plurality of holes 113, through which the gas G is introduced, are arranged substantially parallel to the height direction of the main body 11 (for example, the first direction D1) and are arranged in a plurality of rows along a predetermined direction (for example, the second direction D2) substantially perpendicular to the first direction D1. The inner surface of the hole 113 has a smooth columnar shape that does not substantially inhibit the vibration of the gas G when the gas G is introduced into the hole 113.

[0034] The spacing between the rows is not particularly limited. To achieve a high aperture ratio that does not inhibit the oscillatory flow when attached to a thermoacoustic device, the spacing d [m] between the rows is preferably in the range of r / 5 or more and 2r or less, where r [m] is the radius of the holes 113. To achieve a high aperture ratio, the spacing g [m] between the holes 113 within the row is preferably in the range of r / 10 or more and r or less.

[0035] In order to increase the contact area between the gas G and the main body 11 and to favorably exhibit the dream pipe effect, the radius r [m] of the hole 113 is set to a value that satisfies the following equation in the gas G having an oscillating flow: (260kJ / (ωρc p )) 1 / 2 is in the vicinity of (100k / (ωρc p )) 1 / 2 Above, (720k / (ωρc p )) 1 / 2 It is preferable that ω[s -1 ] is the angular frequency of the vibration of gas G, k [W / K m] is the thermal conductivity of gas G, ρ [kg / m 3 ] is the density of gas G, c P [J / kg K] is the specific heat capacity of gas G.

[0036] For example, if the gas G is dry air pressurized to 0.7 MPa, and the angular frequency ω of the gas G is 660 [s ], which corresponds to the self-excited oscillation inside a thermoacoustic device with a total length of 1.74 [m], -1 ], the radius r [m] is 9.3 × 10 -4 [m] or more, 2.5×10 -3 It is preferable that the diameter of the hole 113 under these conditions is within the range of φ2 to φ5. In addition, the most preferable radius r [m] in this case is about 1.5×10 -3 [m], which corresponds to approximately φ3. When the hole 113 is thin like this, it is difficult to process the inner surface of the hole 113 into a smooth columnar shape.

[0037] Therefore, it is preferable that the plurality of holes 113 have an inner surface smoothed by wire electric discharge machining. Wire electric discharge machining makes it possible to process the inner surface of the hole 113 into a smooth columnar shape even when the hole 113 is thin. This allows the hole 113 to be both a thin hole that effectively exerts the dream pipe effect and to have a smooth columnar inner surface that does not substantially inhibit the vibration of the gas G.

[0038] The surface roughness of the inner surface of the hole 113, in terms of the arithmetic mean roughness Ra according to JIS B 0601:2013, is preferably within the range of 0.1 to 10. This allows the hole 113 to have a smooth, columnar inner surface that does not substantially impede the vibration of the gas G.

[0039] The main body 11 is shaped so as to have a plurality of slits 118 through which the liquid described above is introduced. The slits 118 are arranged linearly between the plurality of rows described above, from one end (e.g., the first side surface 114) of the row (the row formed by the holes 113) in the main body 11 to the other end (e.g., the second side surface 115) of the row described above, so as not to intersect with the holes 113. As a result, the slits 118 exchange heat with the gas G via the main body 11. It is preferable that the slits 118 have a smooth inner surface to reduce pressure loss in the liquid introduced therein.

[0040] The height of slit 118 is not particularly limited. In order to achieve both structural strength around both bottom surfaces and a reduction in pressure loss for the liquid introduced into the slit, the height of slit 118 is preferably, for example, in the range of 50% to 96% of the height of main body 11. The width w [m] of slit 118 is not particularly limited. In order to reduce pressure loss for the liquid introduced into the slit, the width w [m] is preferably 50% to 96% of d.

[0041] For example, if the radius r [m] is 4.4 × 10 -4 [m], and the column spacing d [m] is 1×10 -3 [m], the width w [m] of the preferred slit 118 is 5×10-4 [m] or more, 9.6×10 -4 When the slit 118 is thin like this, it is difficult to process the inner surface of the slit 118 smoothly.

[0042] Therefore, it is preferable that the slit 118 has an inner surface that is smoothed by wire electric discharge machining. Wire electric discharge machining makes it possible to process the inner surface of the slit 118 into a smooth columnar shape even when the slit 118 is thin. This allows the slit 118 to be both thin enough to achieve a high aperture ratio and have a smooth inner surface that reduces pressure loss.

[0043] The surface roughness of the inner surface of the slit 118, in terms of the arithmetic mean roughness Ra according to JIS B 0601:2013, is preferably within the range of 0.1 to 10. This results in a smooth inner surface with low pressure loss for the slit 118. For the same reason, the surface roughness of the inner surface of the slit 118, in terms of the maximum height roughness Ry according to JIS B 0601:2013, is preferably within the range of 0.1 to 20.

[0044] [Shell 2] Fig. 1 is an isometric view of the gas-liquid heat exchanger E of this embodiment. Fig. 6 is a front view of the gas-liquid heat exchanger E of Fig. 1. The following is an example of a preferred embodiment of the shell 2 using Figs. 1 and 6.

[0045] The shell 2 is a hollow member that houses the gas-liquid heat exchanger member 1. The shell 2 has at least a body portion 21. The shell 2 preferably further has a flange 22 to facilitate attachment to a thermoacoustic device T or the like. The shell 2 is configured to house the gas-liquid heat exchanger member 1 without blocking at least some of the holes 113 on both one bottom surface (e.g., first bottom surface 111) and the other bottom surface (e.g., second bottom surface 112) of the main body portion 11 of the gas-liquid heat exchanger member 1.

[0046] The shell 2 is configured so as not to block at least a portion of the slit 118 on both one end side (e.g., the side of the first side surface 114) of the above-mentioned row in the main body portion 11 in which the slit 118 is provided and the other end side (e.g., the side of the second side surface 115) of the above-mentioned row.

[0047] 1 and 6, a pair of first openings 211 communicating between the inside and outside of the shell 2 is provided on the first side surface 114 side, and another pair of openings (not shown) communicating between the inside and outside of the shell 2 is provided on the second side surface 115 side, and a gap is provided between the inner surface of the hollow portion of the shell 2 and the gas-liquid heat exchanger member 1, thereby realizing a configuration in which at least a portion of the slits 118 are not blocked. That is, in the shell 2, at least a portion of the plurality of openings is provided on the same side as one end of the above-mentioned row (e.g., the first side surface 114 side) when viewed from the center of the gas-liquid heat exchanger member 1 to be housed, and at least a portion of the plurality of openings is provided on the same side as the other end of the above-mentioned row (e.g., the second side surface 115 side) when viewed from the center of the gas-liquid heat exchanger member 1.

[0048] To ensure a flow rate of the liquid, the shell 2 may have other openings, exemplified by the second opening 212, the third opening 213, the fourth opening 214, etc. The number and size of the openings are not particularly limited.

[0049] To facilitate the accommodation of the gas-liquid heat exchanger component 1, the body 21 of the shell 2 is preferably configured as a pair of separable members. In this case, the pair of members are preferably configured to be separable along a plane approximately perpendicular to the first direction D1. This makes it possible to apply a force in a direction along the first direction D1 and prevent liquid leakage from the separation surface. The flange 22 preferably has bolt holes 221 to facilitate the application of a force in a direction along the first direction D1 using bolts or the like. To prevent liquid leakage, the flange 22 is preferably configured integrally with the body 21.

[0050] <Manufacturing Method of Gas-Liquid Heat Exchanger E> 7 is a flowchart showing an example of a preferable flow of the method for manufacturing the gas-liquid heat exchanger E according to this embodiment. The following describes an example of a preferable flow of the method for manufacturing the gas-liquid heat exchanger E according to this embodiment, using FIG. 7.

[0051] The method for manufacturing the gas-liquid heat exchanger E preferably includes a shell preparation step, a gas-liquid heat exchanger member production step, and a housing step. The housing step is carried out after the shell preparation step and the gas-liquid heat exchanger member production step.

[0052] [Shell preparation process] The shell preparation step is a step of preparing the shell 2. The shell preparation step is not particularly limited and may be any of the various steps for preparing a hollow shell in the prior art. The procedure for providing the flange 22 is not particularly limited and may be any of the procedures in the prior art. The procedure for providing the first opening 211 and other openings is not particularly limited and may be any of the procedures in the prior art. The procedure for providing the bolt holes 221 is not particularly limited and may be any of the procedures in the prior art.

[0053] [Gas-liquid heat exchanger component manufacturing process] The manufacturing process for a gas-liquid heat exchanger component preferably includes an opening step and a smoothing step. The smoothing step is carried out after the opening step.

[0054] [Opening process] The opening step is a step of opening a plurality of holes 113 that linearly connect from one bottom surface to the other bottom surface, and slits 118 that do not intersect with the holes 113, in a body material that is approximately cylindrical in shape and has one bottom surface (e.g., first bottom surface 111) and another bottom surface (e.g., second bottom surface 112) that are approximately parallel to each other. From the viewpoints of strength and preventing liquid from leaking into the holes 113, it is preferable that the body material be manufactured by cutting or the like from a homogeneous block.

[0055] The material for the main body is not particularly limited, and may be various metals such as stainless steel, aluminum, copper, brass, etc., graphite carbon, etc. The material for the main body is preferably a material with relatively high thermal conductivity such as aluminum, copper, brass, etc. If the material is a thermally anisotropic material such as graphite carbon, it is preferable that the direction of low thermal conductivity approximately coincides with the direction from one bottom surface to the other bottom surface.

[0056] In the opening step, the holes 113 are opened so as to be approximately parallel to the height direction of the main body 11 (for example, the first direction D1) and to form multiple rows along a predetermined direction (for example, the second direction D2) that is approximately perpendicular to the height direction, through which gas G is introduced. The "height direction" referred to here refers to the direction approximately parallel to the height direction of the columnar body, i.e., the direction extending from one bottom surface to the other. The procedure for opening the holes 113 is not particularly limited and may be a procedure used in conventional technology.

[0057] In the opening step, the slits 118 are opened linearly between the plurality of rows described above from one end side of the rows described above in the main body portion 11 (for example, the first side surface 114 side) to the other end side of the rows described above in the main body portion 11 (for example, the second side surface 115 side) so as not to intersect with the holes 113. The procedure for opening the slits 118 is not particularly limited and may be a procedure of the conventional technology.

[0058] [Smoothing process] The smoothing step is a step of smoothing the inner surface of the hole 113. The procedure of smoothing the inner surface of the hole 113 preferably includes a procedure using wire electric discharge machining. This procedure is performed, for example, by passing a wire along the first direction D1 through the inside of the hole 113 opened in the opening step, and smoothing the inner surface of the hole 113 by electric discharge.

[0059] The smoothing step preferably includes a procedure for smoothing the inner surface of the slit 118. The procedure for smoothing the inner surface of the slit 118 preferably includes a procedure using wire electric discharge machining. This procedure is performed, for example, by passing a wire along the second direction D2 through the inside of the slit 118 opened in the opening step, and smoothing the inner surface of the slit 118 by electric discharge.

[0060] The manufacturing method of the gas-liquid heat exchanger member 1 of this embodiment makes it possible to provide the gas-liquid heat exchanger member 1 of this embodiment even when the multiple holes 113 are configured to be narrow so as to effectively exert the dream pipe effect, by smoothing the inside of the holes 113, which are pilot holes opened in the opening process, using wire electric discharge machining or the like.

[0061] [Storage process] The accommodating step is a step of accommodating the gas-liquid heat exchanger member 1 prepared through the opening step and the smoothing step inside the shell 2 prepared in the shell preparation step. The accommodating step is performed so that the shell 2 does not block at least some of the holes 113 on both one bottom surface (e.g., the first bottom surface 111) and the other bottom surface (e.g., the second bottom surface 112) of the main body portion 11, and does not block at least some of the slits 118 on both one end side (e.g., the first side surface 114) of the above-mentioned row in the main body portion 11 and the other end side (e.g., the second side surface 115) of the above-mentioned row.

[0062] The accommodating step preferably includes a procedure in which, after accommodating the gas-liquid heat exchanger component 1 inside a pair of separable shells 2, bolts or the like are inserted into the opposing bolt holes 221 between the pair of shells 2 and tightened. This allows the bolts to apply force in the first direction D1, preventing liquid leakage from the dividing surface.

[0063] [Additional Information Regarding the Effects of the Present Embodiment] For general-purpose heat exchangers, in order to increase the heat transfer area or the like, it is possible to select a parallel-flow microchannel heat exchanger in which multiple plates are prepared in which pores that connect from one cross-section to the other are arranged along the longitudinal direction of the cross-section, and these plates are divided into plates through which a cooling medium passes and plates through which a medium to be cooled passes, and the plates through which a cooling medium passes and plates through which a medium to be cooled passes are alternately stacked.

[0064] On the other hand, when a parallel-flow microchannel heat exchanger configured as described above is used to cool a working fluid that generates an oscillating flow in a device intended to generate and utilize the oscillating flow, such as a thermoacoustic device, the aperture ratio for the working fluid is low. This is because the plate through which the cooled medium passes occupies only about half of the cross section, and only the portion of this plate with the pores passes through the working fluid. Therefore, the low aperture ratio of the parallel-flow microchannel heat exchanger configured as described above hinders the oscillating flow in the device.

[0065] In addition, in parallel-flow microchannel heat exchangers, the cooling medium passes through the pores, which raises concerns about increased pressure loss associated with the cooling medium. If the device's purpose is to improve energy efficiency, pumping the cooling medium with a pump or other device capable of handling large pressure losses and consuming a lot of energy would be counter to this objective. Furthermore, in parallel-flow microchannel heat exchangers configured as described above, there is concern that the bonding between the plates may deteriorate due to vibrations caused by the oscillating flow.

[0066] As described above, the manufacturing method of this embodiment involves drilling pilot holes and slits in the material for the main body, which has an approximately cylindrical shape, and smoothing the inner surfaces of these pilot holes, etc. using wire electric discharge machining, thereby creating holes 113 through which the oscillating gas G is introduced and slits 118 through which the cooling liquid is introduced, so that they are approximately perpendicular to each other.

[0067] This allows the gas-liquid heat exchanger member 1 of this embodiment to have a high aperture ratio for the oscillating gas G, which is the working fluid. Furthermore, in the gas-liquid heat exchanger member 1 of this embodiment, the cooling liquid is introduced through slits 118 rather than through pores provided inside the plates, which reduces pressure loss associated with the cooling liquid. In addition, the gas-liquid heat exchanger member 1 of this embodiment is manufactured using a manufacturing method that does not include a step of joining plates, and therefore is free from damage caused by deterioration of the bonding between the plates due to the oscillating flow of gas.

[0068] As described above, the gas-liquid heat exchanger member 1 and its manufacturing method of this embodiment can provide the gas-liquid heat exchanger E suitable for heat transport using thermoacoustic self-excited vibration.

[0069] <Application to thermoacoustic device T> 8 is a schematic diagram of a thermoacoustic device T equipped with a gas-liquid heat exchanger E of this embodiment. The application of the gas-liquid heat exchanger E of this embodiment to the thermoacoustic device T will be described below using FIG.

[0070] The gas-liquid heat exchanger E can be used as the low-temperature side heat exchanger of a thermoacoustic device T. The thermoacoustic device T is a heat transport device in which a heat accumulator S is arranged inside a tube P filled with a gas G. The heat accumulator S is sandwiched between a low-temperature side heat exchanger and a high-temperature side heat exchanger H. This creates a temperature difference between both ends of the heat accumulator S, generating self-excited oscillations of the thermoacoustic phenomenon in the gas G. By using this self-excited oscillation, the thermoacoustic device T transports heat from the high-temperature side heat exchanger H arranged on the high-temperature side end PE1 side of the tube P to the low-temperature side heat exchanger H arranged on the low-temperature side end PE2 side of the tube P.

[0071] The gas G is, for example, dry air, moist air, nitrogen gas, carbon dioxide gas, etc. By installing the gas-liquid heat exchanger E of this embodiment as the low-temperature side heat exchanger, the thermoacoustic device T reduces the formation of turbulence in the low-temperature side heat exchanger and favorably generates an oscillatory flow due to self-excited vibration. As a result, the thermoacoustic device T has a higher heat transport capacity than when other low-temperature side heat exchangers are installed.

[0072] When the gas-liquid heat exchanger E of this embodiment is attached to a straight-tube thermoacoustic device T, it is preferable that the gas-liquid heat exchanger E is adjacent to the heat accumulator S. Here, "adjacent" means that the distance s from the end of the heat accumulator S on the low-temperature side end PE2 side to the end of the gas-liquid heat exchanger E on the high-temperature side end PE1 side is in the range of r / 5 or more and 4r or less.

[0073] In this case, the lower limit of the distance x from the end of the gas-liquid heat exchanger E on the side of the high-temperature end PE1 to the high-temperature end PE1 of the pipe line provided inside the pipe P is preferably 3 / 25L or more, and more preferably 5 / 25L or more. The upper limit of the distance x is preferably 10 / 25L or less, and even more preferably 9 / 25L or less, where L is the length of the pipe line provided inside the pipe P. This makes it possible to arrange the gas-liquid heat exchanger E so that the above-mentioned distance s falls within the above-mentioned range when the heat accumulator S is arranged in a position where it can suitably generate self-excited vibration.

[0074] [Applicable targets for gas-liquid heat exchanger E] The above describes the case where the gas-liquid heat exchanger E of this embodiment is attached to a thermoacoustic device T, but the application of the gas-liquid heat exchanger E of this embodiment is not limited to the thermoacoustic device T. The gas-liquid heat exchanger E of this embodiment is expected to exhibit the above-mentioned preferable effects in heat exchange with any fluid that has an oscillating flow. Examples of application that satisfy these conditions include a thermoacoustic engine, a dream pipe, and a thermoacoustic refrigerator.

[0075] It should be noted that those skilled in the art may conceive of various modifications and alterations within the spirit of the present invention. Therefore, it is understood that such modifications and alterations fall within the scope of the present invention. For example, even if a person skilled in the art appropriately adds or deletes components or modifies the design of the above-described embodiment, or adds or omits steps or modifies conditions, such modifications are also within the scope of the present invention as long as they maintain the gist of the present invention. [Explanation of symbols]

[0076] T Thermoacoustic Device S heat storage P tube PE1 High temperature side end PE2 Low temperature side end H High temperature side heat exchanger E Gas-liquid heat exchanger 1 Gas-liquid heat exchanger components 11 Main body 111 1st bottom 112 2nd bottom surface 113 holes 114 First aspect 115 Second aspect 116 Third aspect 117 Fourth aspect 118 Slit 2 shells 21 Torso 211 First Opening 212 Second Opening 213 Third Opening 214 4th Opening 22 flange 221 Bolt holes D1 1st direction D2 Second direction G Gas

Claims

1. a main body portion in which heat exchange occurs between a gas introduced therein and a liquid introduced therein; the main body has a generally cylindrical shape having one bottom surface and another bottom surface that are generally parallel to each other, and is provided with a plurality of holes that linearly communicate from the one bottom surface to the other bottom surface; the plurality of holes are provided so as to be substantially parallel to a height direction of the main body portion, and are arranged in a plurality of rows along a predetermined direction substantially perpendicular to the height direction, the shape of the inner surface of the hole is a smooth columnar shape that does not substantially inhibit the vibration of the gas when the gas is introduced into the hole; the main body has a shape provided with a plurality of slits through which the liquid is introduced, The slits are provided linearly between the plurality of rows from one end side of the rows in the main body portion toward the other end side of the rows in the main body portion so as not to intersect with the holes. Components for gas-liquid heat exchangers.

2. 2. The gas-liquid heat exchanger element according to claim 1, wherein the plurality of holes have inner surfaces that are smoothed by wire electric discharge machining.

3. 2. The gas-liquid heat exchanger element according to claim 1, wherein the plurality of slits have inner surfaces that are smoothed by wire electric discharge machining.

4. The gas-liquid heat exchanger member according to any one of claims 1 to 3, a hollow shell that accommodates the gas-liquid heat exchanger member; Equipped with the shell accommodates the gas-liquid heat exchanger member so as not to block at least a portion of the holes on both the one bottom surface and the other bottom surface of the main body portion, and not to block at least a portion of the slits on both the one end side and the other end side of the main body portion; the shell has a plurality of openings that communicate between the inside and the outside of the shell along the predetermined direction, At least some of the openings are provided on the same side as the one end when viewed from the center of the gas-liquid heat exchanger element, At least some of the openings are provided on the same side as the other end when viewed from the center of the gas-liquid heat exchanger element. Gas-liquid heat exchanger.

5. an opening step of opening a plurality of holes linearly communicating from one bottom surface to the other bottom surface and slits not intersecting with the holes in a substantially columnar body material having one bottom surface and another bottom surface that are substantially parallel to each other; a smoothing step of smoothing the inner surface of the hole; Including, In the opening step, the plurality of holes are opened substantially parallel to the height direction of the main body portion and formed in a plurality of rows along a predetermined direction substantially perpendicular to the height direction, the slits are formed linearly between the plurality of rows from one end side of the rows in the main body portion to the other end side of the rows in the main body portion so as not to intersect with the holes; A method for manufacturing a gas-liquid heat exchanger component.

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