JP2017219214A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger having high pressure-resistance performance and high heat- exchange performance.SOLUTION: A heat exchanger comprises a flow channel partition member 22 made of CFRP and providing a pipe part 31 defining and forming a heat medium flow channel in which a heat transport medium flows. CFRP includes a first fiber group having a plurality of PAN-based carbon fibers 41 and a second fiber group having a plurality of pitch type carbon fiber 42 shorter than the carbon fiber 41. The first fiber group is extended so that each of the carbon fibers 41 surrounds the heat medium flow channel. In the second fiber group, the plurality of carbon fibers 42 are oriented in the direction intersecting the extending direction of the carbon fiber 41.SELECTED DRAWING: Figure 7

Description

  The technology disclosed herein relates to a heat exchanger made of carbon fiber reinforced plastic for heat exchange between a heat transport medium and a heat exchange medium.

  As a prior art, for example, there is a heat exchanger disclosed in Patent Document 1 below. In the heat exchanger disclosed therein, the tubes and fins are formed using carbon fiber reinforced plastic.

JP 2008-138968 A

  In the above-described heat exchanger made of carbon fiber reinforced plastic, further performance improvement is required. Specifically, in a heat exchanger made of carbon fiber reinforced plastic, improvement in pressure resistance is required. In addition, heat exchangers made of carbon fiber reinforced plastic are required to have improved heat exchange performance.

  The technology disclosed herein has been made in view of the above points, and an object thereof is to provide a heat exchanger having high pressure resistance performance and high heat exchange performance.

In order to achieve the above object, in the disclosed heat exchanger,
A flow path partition member (22, 322) made of carbon fiber reinforced plastic that provides pipe portions (31, 231) that define a heat medium flow path through which the heat transport medium flows;
The carbon fiber reinforced plastic includes a first fiber group having a plurality of first carbon fibers (41) and a second fiber group having a plurality of second carbon fibers (42) shorter than the first carbon fibers,
The first fiber group extends so that each of the first carbon fibers surrounds the heat medium flow path,
The second fiber group is in a state where a plurality of second carbon fibers are oriented in a direction crossing the extending direction of the first carbon fibers, or in a non-oriented state where a plurality of second carbon fibers are randomly arranged. .

  According to this, the 1st carbon fiber of the 1st fiber group is orientated so that a heat carrier channel may be surrounded in a pipe part. Therefore, high pressure resistance can be exhibited in the radial direction of the tube portion. In addition, the second carbon fibers of the second fiber group are oriented in a direction intersecting with the orientation direction of the first carbon fibers of the first fiber group. Alternatively, the second fiber group is in a non-oriented state, and at least a part of the plurality of second carbon fibers of the second fiber group extends in a direction intersecting with the orientation direction of the first carbon fibers of the first fiber group. Is arranged. Therefore, the heat transfer in the circumferential direction of the tube portion can be promoted by the first carbon fiber, and the heat transfer in the longitudinal direction of the tube portion can be promoted by the second carbon fiber. As a result, a heat exchanger having high pressure resistance performance and high heat exchange performance can be provided.

  In addition, the code | symbol in the parenthesis described in a claim and this clause shows the correspondence with the specific means as described in embodiment mentioned later as one aspect, Comprising: The range of an indication technique is limited It is not a thing.

It is a block diagram which shows the refrigerating cycle which concerns on 1st Embodiment. It is a front view which shows a heat exchanger. It is sectional drawing which shows the refrigerant | coolant heat exchanger in the III-III line | wire of FIG. It is sectional drawing which shows the refrigerant | coolant heat exchanger in the IV-IV line of FIG. It is a perspective view which shows the plate of a heat exchanger. It is an expanded sectional view which shows the flow-path division member of a heat exchanger. It is a perspective view which shows the flow-path division member of a heat exchanger. It is process drawing which shows the manufacturing method of a heat exchanger. It is process drawing which shows the manufacturing method of the prepreg sheet | seat used for a heat exchanger. It is sectional drawing which shows the flow-path division member of 2nd Embodiment. It is a fragmentary sectional view showing the heat exchanger of a 3rd embodiment.

  A plurality of embodiments for disclosure will be described with reference to the drawings. In each embodiment, the same reference numerals are assigned to portions corresponding to the matters described in the preceding embodiment, and the preceding description can be referred to for the portion. Further, in subsequent embodiments, portions corresponding to the matters described in the preceding embodiments may be given reference numerals that differ only by a hundred or more places. In each embodiment, when only a part of the structure is described, the other parts of the structure can be applied with reference to the description of the other forms.

(First embodiment)
In FIG. 1, a refrigeration cycle 10 is a thermal device that uses heat absorption and / or heat dissipation accompanying a phase change of a refrigerant. The refrigerant may be provided by various refrigerants such as a natural refrigerant such as a fluorocarbon refrigerant and carbon dioxide. The refrigeration cycle 10 is a vapor compression refrigeration cycle in which a phase change is caused by pressurizing and / or depressurizing a refrigerant to generate heat absorption and / or heat generation. The refrigeration cycle 10 is used for an air conditioner, a refrigeration facility, and the like. In this embodiment, the refrigeration cycle 10 is used in an air conditioner for air conditioning a vehicle interior. The refrigeration cycle 10 is mounted on a vehicle. Therefore, the refrigeration cycle 10 is required to be lightweight.

  The refrigeration cycle 10 includes a compressor 11 that compresses the refrigerant. The refrigeration cycle 10 includes a radiator 12 that radiates heat from a high-temperature and high-pressure refrigerant compressed by the compressor 11. When the refrigerant condenses, the radiator 12 is also called a condenser. The refrigeration cycle 10 includes a decompressor 13 that decompresses the refrigerant cooled by the radiator 12. The refrigeration cycle 10 includes a heat absorber 14 that absorbs heat from a low-temperature and low-pressure refrigerant decompressed by the decompressor 13. When the refrigerant evaporates, the heat absorber 14 is also called an evaporator.

  At least one of the radiator 12 and the heat absorber 14 is used for air conditioning as a use side heat exchanger. The other of the radiator 12 and the heat absorber 14 functions as a non-use side heat exchanger. For example, when the air conditioner is used for cooling applications, the heat absorber 14 is used as a use side heat exchanger for cooling a medium for air conditioning, for example, air. In this case, the radiator 12 is used as a non-use side heat exchanger to discharge heat.

  The radiator 12 and the heat absorber 14 are refrigerant heat exchangers in the refrigeration cycle. Since the refrigerant is pressurized or depressurized, the refrigerant heat exchanger is required to have high pressure resistance. For example, the radiator 12 is required to have a strength that can withstand the high pressure of the internal refrigerant. Further, the heat absorber 14 is required to have a strength that can withstand the low pressure of the internal refrigerant.

  The radiator 12 and the heat absorber 14 are required to exhibit high heat exchange performance as a heat exchanger. When the medium that exchanges heat with the refrigerant is air, the refrigerant heat exchanger is required to provide high heat transfer performance between the refrigerant and air. Therefore, the member forming the refrigerant heat exchanger is required to provide high heat transfer performance between the refrigerant and the air.

  In this embodiment, a novel refrigerant heat exchanger that can be used as the radiator 12 and / or the heat absorber 14 of the refrigeration cycle is provided. In this embodiment, a novel refrigerant heat exchanger that can be used as the heat absorber 14 is provided.

  In FIG. 2, the refrigerant heat exchanger 20 provides heat exchange between the refrigerant as the heat transport medium of the refrigeration cycle and the air as the heat exchange medium. The refrigerant heat exchanger 20 can be used as the heat absorber 14. In the present embodiment, the refrigerant heat exchanger 20 corresponds to a heat exchanger that provides heat exchange between the heat transport medium and the heat exchange medium.

  The refrigerant heat exchanger 20 includes a heat exchange unit 21 and tank units 24 and 25. The heat exchange part 21 has a plurality of flow path partition members 22. The refrigerant heat exchanger 20 can include a support portion for supporting the refrigerant heat exchanger 20 on the air conditioner. The heat exchange part 21 and the tank parts 24 and 25 of the refrigerant heat exchanger 20 are made of carbon fiber reinforced plastic (CERP). The support part can also be made by CERP.

  The plurality of flow path partition members 22 partition and form a coolant flow path through which the coolant flows. The flow path dividing member 22 is also called a tube member because it forms a tube through which the refrigerant flows. Since the flow path partition member 22 has a plate-like appearance and partitions a refrigerant flow path that is a heat medium flow path through which the heat transport medium flows, it is also called a heat exchange plate. The plurality of flow path partition members 22 define an air passage 23 through which air flows. The plurality of flow path partition members 22 are also heat transfer members responsible for heat transfer between the refrigerant and the air. The plurality of flow path partition members 22 are arranged in a stacked manner so as to be parallel to each other. The plurality of flow path partition members 22 are disposed with a predetermined gap so as to partition the air passage 23 therebetween. The air passage 23 is a passage through which air for air conditioning as a medium to be cooled flows.

  The tank unit 24 is an inlet tank that receives the refrigerant from the decompressor 13 and distributes the refrigerant to the plurality of flow path partition members 22. An inlet pipe 26 is provided in the tank portion 24. The tank unit 25 is an outlet tank that collects refrigerant from the plurality of flow path partition members 22 and supplies the refrigerant to the compressor 11. An outlet pipe 27 is provided in the tank portion 25. The plurality of flow path partition members 22 are disposed between the tank portion 24 and the tank portion 25. The plurality of flow path partition members 22 communicate the inner chamber of the tank portion 24 and the inner chamber of the tank portion 25.

  FIG. 3 shows a cross section taken along line III-III in FIG. In this cross section, a cross section perpendicular to the refrigerant flow direction of the flow path partition member 22, that is, a cross section perpendicular to the longitudinal direction of the flow path partition member 22 is illustrated. FIG. 4 shows a cross section taken along line IV-IV in FIG.

  The flow path partition member 22 has a tube portion 31. The tube portion 31 provides a tube through which the refrigerant flows. The pipe part 31 defines a refrigerant passage in the pipe part 31. The tube portion 31 can have various cross-sectional shapes such as a circle, an ellipse, and a polygon. In this embodiment, the tube portion 31 has a circular cross section. One flow path partition member 22 may be provided with one or a plurality of pipe portions 31. In this embodiment, three pipe portions 31 are provided in one flow path partition member 22. The pipe portion 31 communicates with the inner chambers of the tank portions 24 and 25 at both ends of the flow path partition member 22. The pipe portion 31 communicates the inner chamber of the tank portion 24 and the inner chamber of the tank portion 25 by a refrigerant passage inside thereof.

  The flow path partition member 22 has a plate portion 32 extending from the tube portion 31. A part of the plate portion 32 is provided at the front edge of the flow path partition member 22 so as to provide the front edge of the flow path partition member 22 with respect to the air flow direction AF. A part of the plate portion 32 is provided at the rear edge of the flow path partition member 22 so as to provide the rear edge of the flow path partition member 22 with respect to the air flow direction AF. A part of the plate portion 32 is provided between the two tube portions 31.

  The plate portion 32 extends so as to expand from the tube portion 31. The plate portion 32 extends between the plurality of tube portions 31. The plate portion 32 connects between the two adjacent tube portions 31. The plate portion 32 extends between the tank portion 24 and the tank portion 25. The plate portion 32 contributes to increase the mechanical strength of the flow path partition member 22. The plate portion 32 is a heat transfer member that is provided outside the tube portion 31 and widens the contact area with air that is a heat exchange medium. The plate portion 32 is provided by the flow path partition member 22 and is made of CFRP. The plate portion 32 contributes to increase the surface area where the flow path partition member 22 and air come into contact. The plate portion 32 can also be called a fin portion.

  The tube portion 31 forms a convex portion that protrudes from the plate portion 32 toward the air passage 23. In other words, the plate portion 32 forms a recess between the two tube portions 31. Further, the flow path partition members 22 adjacent to each other are arranged such that their pipe portions 31 are displaced with respect to the air flow direction AF. As a result, the air passage 23 defined between the flow path partition members 22 is formed to meander in the air flow direction AF. Such an arrangement facilitates heat transfer between the flow path partition member 22 and air.

  Air is blown into the air passage 23 formed between the flow path partition members 22 by the blower of the air conditioner. The air flows so as to intersect the longitudinal direction of the tube portion 31. Air flows in parallel to the plate portion 32. Since the refrigerant heat exchanger 20 is used as the heat absorber 14, condensed water adheres to the outer surfaces of the tube portion 31 and the plate portion 32. In this embodiment, the refrigerant heat exchanger 20 is installed in the air conditioner so that the plate portion 32 extends almost in parallel with the direction of gravity. Such an installed state of the refrigerant heat exchanger 20 promotes the discharge of condensed water.

  One flow path partition member 22 is formed by laminating plates 33 and 34. In this embodiment, one flow path partition member 22 is formed by laminating and joining two independent plates 33 and 34. One flow path partition member 22 may be formed by bending and joining one plate.

  In FIG. 5, the first plate 33 and the second plate 34 forming the flow path partition member 22 have a shape corresponding to the refrigerant heat exchanger 20. The plates 33 and 34 have an elongated shape. In the example shown, the plates 33, 34 can be referred to as quadrilaterals or rectangles. The plates 33 and 34 are made of CFRP.

  The plates 33 and 34 have a groove portion 35 for forming the tube portion 31 and a flat plate portion 36 for forming the plate portion 32. The groove portion 35 is recessed from the flat plate portion 36 on one surface of the plates 33 and 34 and protrudes from the flat plate portion 36 on the other surface. The plates 33 and 34 have concave portions 37 and 38 for forming the tank portions 24 and 25. The concave portions 37 and 38 are recessed from the flat plate portion 36 on one surface of the plates 33 and 34 and protrude from the flat plate portion 36 on the other surface. Both ends of the groove portion 35 reach the concave portions 37 and 38. Both ends of the groove portion 35 are open toward the concave portions 37 and 38. One flow path partition member 22 is formed by laminating the plates 33 and 34 facing each other. The first plate 33 and the second plate 34 have a symmetrical shape with respect to their mating surfaces.

  FIG. 6 shows a modeled cross section of the flow path partition member 22. These plates 33 and 34 include a resin material constituting CFRP, and carbon fibers 41 and carbon fibers 42. The CFRP matrix resin includes a plurality of carbon fibers 41 and a plurality of carbon fibers 42. The carbon fiber 41 corresponds to the first carbon fiber in the present embodiment. The plurality of carbon fibers 41 constitute a first fiber group. The carbon fiber 42 corresponds to the second carbon fiber in the present embodiment. The plurality of carbon fibers 42 constitute a second fiber group.

  In the drawing, in order to show the orientation directions of the carbon fibers 41 and the carbon fibers 42, the representative carbon fibers 41 and the carbon fibers 42 are drawn with thin solid lines in the cross section. Each of the plurality of carbon fibers 41 extends in the XX direction, which is the horizontal direction in the figure, along the shape of the groove portion 35 and the flat plate portion 36. Each of the plurality of carbon fibers 42 extends in the YY direction, which is the front and back direction of the drawing. In addition, in FIG. 6, although the structure which arrange | positions the carbon fiber 42 only to the one side of the carbon fiber 41 in a matrix resin is illustrated, it is not limited to this. For example, the carbon fiber 42 may be disposed on the other side of the carbon fiber 41.

  FIG. 7 is a partial cross-sectional perspective view of the flow path partition member 22. In the drawing, in order to show the orientation directions of the carbon fibers 41 and the carbon fibers 42, representative carbon fibers 41 and the carbon fibers 42 are drawn with broken lines. In this example, the carbon fiber 41 is made of a PAN-based carbon fiber, and the carbon fiber 41 is made of a pitch-based carbon fiber. The PAN-based carbon fiber particularly greatly contributes to the high strength and high rigidity of the CFRP molded product. The PAN-based carbon fiber greatly contributes to high heat conduction of the CFRP molded product. The pitch-based carbon fiber particularly greatly contributes to high heat conduction of the CFRP molded product. The carbon fiber 41 is longer than the carbon fiber 42. The average fiber length of the first fiber group is larger than the average fiber length of the second fiber group.

  The carbon fiber 41 has high thermal conductivity. The carbon fiber 41 has a much higher thermal conductivity than the matrix resin material constituting the CFRP. The carbon fiber 42 has higher thermal conductivity than the carbon fiber 41. The carbon fiber 42 has a much higher thermal conductivity than the matrix resin material. Therefore, the carbon fibers 41 and the carbon fibers 42 have a great influence on the heat transfer in the flow path partition member 22.

  The carbon fiber 41 used in this embodiment is longer than the thickness of the plates 33 and 34. The carbon fiber 41 has a length extending from end to end of the plates 33 and 34 with respect to the width direction of the plates 33 and 34, that is, the direction orthogonal to the longitudinal direction of the refrigerant flow path provided by the tube portion 31. The carbon fiber 41 is, for example, a so-called continuous fiber. The carbon fiber 41 is provided by a UD tape in which a plurality of carbon fibers are arranged in a single direction.

  On the other hand, the carbon fibers 42 extend along the longitudinal direction of the tube portion 31. As described above, the carbon fiber 42 is shorter than the carbon fiber 41. The carbon fiber 42 is, for example, a so-called chopped fiber. The carbon fiber 42 is, for example, a fiber having a length of about 2 to 5 mm.

  In the CFRP used for the flow path partition member 22, the content of the carbon fiber contained in the matrix resin is preferably 15 to 70% by volume. And it is preferable that the ratio of the carbon fiber 41 with respect to all the carbon fibers is 5-95 volume%, and if it is 15-80 volume%, it is more preferable.

  The carbon fiber 41 is oriented in the tube portion 31 so as to extend so as to surround the refrigerant flow path. In the illustrated example in which the tube portion 31 has a circular cross section, the carbon fibers 41 are oriented so as to extend along the circumferential direction of the tube portion 31. In other words, the carbon fibers 41 are oriented so as to extend parallel to the cross section in a cross section perpendicular to the longitudinal direction of the refrigerant flow path provided by the tube portion 31. Such an orientation of the carbon fibers 41 contributes to improving the pressure resistance in the radial direction of the tube portion 31.

  The carbon fiber 41 is oriented in the plate portion 32 so as to extend in a direction intersecting with the longitudinal direction of the refrigerant flow path provided by the tube portion 31, for example, in a direction orthogonal thereto. Such an orientation promotes heat conduction in the XX direction in the plate portion 32 and contributes to suppression of the temperature distribution in the plate portion 32.

  The carbon fibers 41 are oriented so as to extend from the tube portion 31 in the plate portion 32. The carbon fiber 41 extends through the plate portion 32 so as to extend from the tube portion 31. Such an orientation contributes to promote heat transfer between the tube portion 31 and the plate portion 32.

  Furthermore, the carbon fiber 41 extends continuously over both the tube portion 31 and the plate portion 32. Use of such long carbon fibers 41 and / or orientation of the carbon fibers 41 further promotes heat transfer between the tube portion 31 and the plate portion 32.

  The carbon fiber 41 extends in the plate portion 32 so as to connect between the two adjacent tube portions 31. Such an orientation improves the mechanical strength in the XX direction, which is the width direction of the flow path partitioning member 22. The carbon fiber 41 extends over the entire width of the flow path partition member 22 along the flow direction AF of air that is a heat exchange medium. The carbon fiber 41 extends over all of the plurality of tube portions 31 and the plurality of plate portions 32.

  The carbon fibers 42 are oriented so as to extend in a direction that intersects with the direction in which the carbon fibers 41 extend, for example, in a direction orthogonal thereto. The carbon fiber 42 extends so as to intersect the carbon fiber 41 in each of the tube portion 31 and the plate portion 32. Such orientation of the carbon fibers 42 promotes heat conduction in the YY direction in the plate portion 32 and contributes to suppression of temperature distribution in the plate portion 32.

  The orientation of the carbon fibers 41 and the carbon fibers 42 in the tube portion 31 and / or the plate portion 32 as described above makes it possible to reduce the thickness of the flow path partition member 22. The thin flow path partition member 22 enables the refrigerant heat exchanger 20 to be reduced in weight. Moreover, the thin flow path partition member 22 further promotes the heat transfer between the refrigerant and the air.

  FIG. 8 shows the main steps in the method for manufacturing the refrigerant heat exchanger 20. The manufacturing method of the refrigerant | coolant heat exchanger 20 has the process described below. The first step 8A is a step of supplying a material for the plates 33 and 34. In this step, a CFRP prepreg is supplied. The prepreg is supplied in a state where carbon fiber is impregnated with a resin material. The resin material is selected so that the prepreg has processability and curing characteristics suitable for the subsequent process. As the resin material of the prepreg, a thermosetting resin or a thermoplastic resin can be used. The prepreg is supplied as a roll material 51. An example of a thermosetting resin is an epoxy resin. An example of the thermoplastic resin is a polyamide resin.

  The second step 8B is a step of processing the material into the shape of the plates 33 and 34. In this step, the prepreg is cut into a predetermined size and given a predetermined shape. The prepreg is formed into a shape corresponding to the plates 33 and 34. For example, the shapes of the plates 33 and 34 are formed by press working using the press machine 52.

  The third step 8C is a step of arranging the plurality of plates 33 and 34 in a stacked manner so as to form the refrigerant heat exchanger 20. In this step, the plurality of plates 33 and 34 are regularly stacked. In this step, a pair of symmetrical plates 33 and 34 are laminated for one flow path partition member 22. Further, in this step, a plurality of sets of plates 33 and 34 for forming the refrigerant heat exchanger 20 are laminated. The fourth step 8D is a step of joining the plates 33 and 34 and solidifying the prepreg. When the matrix resin is a thermosetting resin, the matrix resin is solidified by thermosetting. When the matrix resin is a thermoplastic resin, the matrix resin is solidified by cooling.

  FIG. 9 shows the main steps in the method for manufacturing the prepreg supplied to the first step 8A of FIG. The manufacturing method of a prepreg has the process described below. The first step 9A is a step of preparing aligned carbon fibers 41. In this step, for example, a UD sheet of carbon fiber 41 is prepared. In this step, the aligned carbon fibers 41 are disposed in a cavity that is a product part of a mold, for example.

  The second step 9B is a step of injecting a matrix resin. In this step, a matrix resin containing carbon fibers 42 is injected. In this step, for example, matrix resin is injected into the cavity from the film gate 61 extending in the extending direction of the carbon fibers 41 on the side of the UD sheet. By injecting the matrix resin from the film gate 61, the carbon fibers 42 included in the matrix resin are oriented in the injection direction. That is, the carbon fibers 42 are oriented in a direction orthogonal to the carbon fibers 41.

  The third step 9C is a step of once solidifying the matrix resin to form a prepreg sheet. In this step, when the matrix resin is a thermosetting resin, the thermosetting is allowed to proceed to a predetermined level and then cooled to bring the matrix resin into a B-stage state. When the matrix resin is a thermoplastic resin, the matrix resin is solidified by cooling.

  The fourth step 9D is a step of winding the prepreg sheet manufactured in the third step 9C to make the roll material 51. The roll material 51 manufactured in this step is supplied to the first step 8A in FIG.

  The manufacturing method of a prepreg is not limited to the method demonstrated using FIG. 9, A various manufacturing method is employable. For example, a sheet in which the carbon fibers 41 are oriented in the matrix resin and a sheet in which the carbon fibers 42 are oriented in the matrix resin are overlapped so that the orientation direction of the carbon fibers 41 and the orientation direction of the carbon fibers 42 intersect. It may be a thing.

  The carbon fiber 41 is available, for example, as “Pyrofil (registered trademark)” sold by Mitsubishi Rayon Co., Ltd. The carbon fiber 41 can be obtained as a UD tape having a single fiber direction, or a fabric sheet as a woven fabric. The carbon fiber 41 is available as, for example, “Torayca (registered trademark)” sold by Toray Industries, Inc. The carbon fiber 41 can be obtained as a UD tape having a single fiber direction, or a fabric sheet as a woven fabric. The carbon fiber 42 is available as, for example, “DIALEAD (registered trademark)” sold by Mitsubishi Plastics, Inc. The carbon fiber 41 is available as a chopped fiber or short fiber pellet, which is a discontinuous base material, or a milled fiber obtained by shortly pulverizing the fiber.

  The carbon fiber 41 can also be provided by a fabric sheet woven from carbon fiber. In this case, the carbon fibers that extend so as to intersect the carbon fibers 41 in the plates 33 and 34 include the carbon fibers 42 and the carbon fibers that form the fabric sheet together with the carbon fibers 41.

  As explained so far, the carbon fiber 41 that is the first carbon fiber is a PAN-based carbon fiber and is preferably a so-called continuous fiber. Further, the carbon fiber 42 as the second carbon fiber is a pitch-based carbon fiber and is preferably a so-called short fiber. However, the present invention is not limited to this. The first carbon fiber may be longer than the second carbon fiber, the first carbon fiber may extend in the circumferential direction of the tube portion 31, and the second carbon fiber may extend in a direction intersecting the first carbon fiber. .

  As long as the 1st carbon fiber is longer than the 2nd carbon fiber, carbon fiber shorter than the above-mentioned explanation may be used. The first carbon fiber may be, for example, a pitch-based carbon fiber. The first carbon fibers may not be continuous fibers but may be so-called long fibers. Moreover, what is called a short fiber may be used.

  In addition, as long as the second carbon fiber is shorter than the first carbon fiber, a carbon fiber longer than the above description may be used. The second carbon fiber may be, for example, a PAN-based carbon fiber. The second carbon fiber may not be a short fiber but may be a so-called long fiber. Moreover, a carbon nanotube can also be employ | adopted for a 2nd carbon fiber.

  The first carbon fiber is available, for example, as “DIALEAD”. The first carbon fiber can be obtained as a UD tape having a unidirectional fiber direction or a fabric sheet as a woven fabric. Also. The second carbon fiber is available, for example, as “Pyrofil”. The second carbon fiber is available as a chopped fiber that is a discontinuous substrate. The second carbon fiber is available as, for example, “Treca”. The second carbon fibers are available as cut fibers or short fiber pellets that are discontinuous substrates.

  When a UD tape or a fabric sheet is used for the first carbon fibers, the prepreg is provided by positioning the longitudinal direction of the first carbon fibers in the necessary direction as the plates 33 and 34 and impregnating the resin material. When a discontinuous base material called chopped fiber, cut fiber, or short fiber pellet is used for the first carbon fiber, the orientation of the first carbon fiber can be provided by injection molding of a resin material mixed with the discontinuous base material. is there.

  When a thermosetting resin is used as the CFRP matrix resin material, a vacuum heating and pressurizing process using an autoclave can be used as a process of the manufacturing method of the refrigerant heat exchanger 20. Also, a resin injection molding process called RTM (Resin Transfer Molding) process or an inhalation type resin injection molding process called VaRTM (Vacuum Resin Transfer Molding) process can be used. Further, when a thermoplastic resin is used as the CFRP matrix resin material, a stamp pressing step (Stamping Molding) or an injection molding step (Injection Molding) may be used for the manufacturing method of the refrigerant heat exchanger 20. it can.

  The refrigerant heat exchanger 20 that is a heat exchanger of this embodiment includes a CFRP channel partition member 22 that provides a pipe portion 31 that partitions and forms a heat medium channel through which a heat transport medium flows. The CFRP includes a first fiber group that includes a plurality of carbon fibers 41 that are first carbon fibers, and a second fiber group that includes a plurality of carbon fibers 42 that are second carbon fibers shorter than the carbon fibers 41. The first fiber group is extended so that each of the carbon fibers 41 surrounds the heat medium flow path. The second fiber group is in a state in which a plurality of carbon fibers 42 are oriented in a direction crossing the extending direction of the carbon fibers 41.

  According to this, the carbon fibers 41 of the first fiber group are oriented so as to surround the heat medium flow path in the tube portion 31. Therefore, high pressure resistance can be exhibited in the radial direction of the tube portion 31. Further, the carbon fibers 42 of the second fiber group are oriented in a direction intersecting with the orientation direction of the carbon fibers 41 of the first fiber group. Therefore, the heat transfer in the circumferential direction of the tube portion 31 can be promoted by the carbon fiber 41. As a whole, the flow path partition member 22 can promote heat transfer in the XX direction shown in the figure. Further, the heat transfer in the longitudinal direction of the tube portion 31 can be promoted by the carbon fibers 42. As a whole, the flow path partition member 22 can promote heat transfer in the YY direction shown in the figure. As a result, high pressure resistance and high heat exchange performance can be provided.

  Further, a PAN-based carbon fiber can be used for the carbon fiber 41, and a pitch-based carbon fiber can be used for the carbon fiber 42. According to this, the PAN-based carbon fiber having higher thermal conductivity than the matrix resin and excellent in contribution of relatively high strength and high rigidity can be oriented so as to surround the heat medium flow path. On the other hand, pitch-based carbon fibers that are relatively excellent in thermal conductivity can be oriented so as to intersect with the PAN-based carbon fibers. Therefore, it is possible to reliably provide high pressure resistance and high heat exchange performance.

  In addition, by combining carbon fibers having different characteristics in the same matrix resin, it is possible to set necessary characteristics that differ depending on the part of the heat exchanger with an integral resin material. Therefore, the degree of freedom in design related to thermal characteristics is improved. Moreover, since it is not necessary to combine and process high-strength resin and highly heat conductive resin, it is possible to suppress the manufacturing cost of the heat exchanger.

  Moreover, according to this embodiment, since CFRP is used for the flow path partition member 22 which is the refrigerant flow path constituting member of the refrigerant heat exchanger 20, the refrigerant flow path constituting member can be formed thin and lightweight. As a result, a lightweight refrigerant heat exchanger is provided. According to this embodiment, the carbon fibers 41 are oriented so as to extend from the tube portion 31 in the plate portion 32. For this reason, the refrigerant | coolant heat exchanger which has high heat exchange performance between the refrigerant | coolant in the pipe part 31 and the medium outside the board part 32 is provided.

(Second Embodiment)
This embodiment is a modification based on the preceding embodiment. In the said embodiment, the pipe part 31 has divided and formed the refrigerant | coolant flow path of circular cross section. Instead, the flow path partition member 22 can be formed so as to partition and form refrigerant flow paths having various cross-sectional shapes.

  As shown in FIG. 10, the flow path partition member 22 of this embodiment has a tube portion 231. The tube portion 231 defines a coolant channel having a cross-sectional shape that can be called a rectangle or an oval. Also in this embodiment, the refrigerant flow path corresponds to a heat medium flow path through which the heat transport medium flows.

  According to this embodiment, the contact surface between the refrigerant and the plates 33 and 34 is formed over a wide range. Further, a planar range over a wide area is provided on the outer surface of the flow path partition member 22. Such a shape makes it possible to provide heat exchange performance suitable for the application of the refrigerant heat exchanger 20.

  Characteristic disclosure of the first fiber group having a plurality of first carbon fibers and the second fiber group having a plurality of second carbon fibers described in the preceding embodiment also in the flow path partition member 22 of the present embodiment. Applying technology is effective.

(Third embodiment)
This embodiment is a modification based on the preceding embodiment. In the said embodiment, the refrigerant | coolant heat exchanger 20 belongs to the format called what is called a laminated plate type | mold or a drone cup type | mold. Instead, the refrigerant heat exchanger 20 can be provided in various forms.

  The refrigerant heat exchanger 20 illustrated in FIG. 11 belongs to a format called a tube and header type. One application of the refrigerant heat exchanger 20 shown is a radiator 12.

  The refrigerant heat exchanger 20 has a plurality of flow path partition members 322. Also in this embodiment, the flow path partition member 322 constitutes a refrigerant flow path through which the refrigerant flows. Also in this embodiment, the refrigerant flow path corresponds to a heat medium flow path through which the heat transport medium flows.

  The flow path partition member 322 includes only the portions corresponding to the tube portion 31 and the plate portion 32 without including the concave portions 37 and 38 and the peripheral portion thereof in the flow path partition member 22 of the preceding embodiment. Therefore, the flow path partition member 322 is formed mainly to provide a refrigerant flow path. Also in this embodiment, the air passage 23 is formed between the plurality of flow path partition members 322. In the air passage 23, fins 328 thermally connected to the flow path partition member 322 are disposed. The fins 328 are heat transfer members that are provided outside the tube portion 31 and increase the contact area with the air that is the heat exchange medium. The fin 328 is a separate member from the flow path partition member 322.

  In the illustrated example, the fins 328 are provided by corrugated members called corrugated fins. The fins 328 are made of a material that can be thermally and mechanically bonded to the flow path partition member 322 made of CFRP. The fins 328 are made of CFRP. When the fins 328 are bonded to the flow path partition member 22, the fins 328 can be made of metal such as aluminum.

  The refrigerant heat exchanger 20 includes header tanks 324 and 325 in which both ends of a plurality of flow path partition members 322 are in fluid communication. The header tanks 324 and 325 are made of metal such as aluminum or CFRP. The flow path partitioning member 22 communicates with the refrigerant chamber partitioned in the header tanks 324 and 325.

  Characteristic disclosure of the first fiber group having a plurality of first carbon fibers and the second fiber group having a plurality of second carbon fibers described in the preceding embodiment also in the flow path partition member 322 of the present embodiment. Applying technology is effective.

(Other embodiments)
The present disclosure is not limited to the illustrated embodiment, and can be implemented with various modifications. The disclosure is not limited to the combinations shown in the embodiments, and can be implemented by various combinations. Embodiments can have additional parts. The portion of the embodiment may be omitted. The parts of the embodiments can be replaced or combined with the parts of the other embodiments. The structure, operation, and effect of the embodiment are merely examples. The technical scope disclosed is not limited to the description of the embodiments. Some technical scope disclosed is indicated by the description of the claims, and should be understood to include all modifications within the meaning and scope equivalent to the description of the claims. .

  In the above embodiment, the carbon fiber 41 and the carbon fiber 42 are provided on the entire flow path partition member 22. Instead, the carbon fiber 41 and the carbon fiber 42 may be provided only in a part of the flow path partition member 22. For example, the carbon fiber 41 and the carbon fiber 42 may be provided in a portion where high mechanical strength is required and / or a portion where high heat mobility is required. Further, in addition to the above-described embodiment, additional carbon fibers may be added to portions where high mechanical strength is required and / or portions where high heat mobility is required.

  Moreover, in the said embodiment, the carbon fiber 42 which comprises a 2nd fiber group was orientated in the direction which cross | intersects the extending direction of the carbon fiber 41 which comprises a 1st fiber group. However, the present invention is not limited to this. The plurality of second carbon fibers constituting the second fiber group may be in a non-oriented state arranged randomly. The non-oriented state can also be referred to as a random oriented state.

  According to this, it arrange | positions so that at least one part of several 2nd carbon fiber of the 2nd fiber group of a non-orientation state may extend in the cross | intersection direction with respect to the orientation direction of the 1st carbon fiber of a 1st fiber group. . Therefore, the heat transfer in the circumferential direction of the tube portions 31 and 231 can be promoted by the first carbon fiber, and the heat transfer in the longitudinal direction of the tube portions 31 and 231 can be promoted by the second carbon fiber. As a result, a heat exchanger having high pressure resistance performance and high heat exchange performance can be provided.

  Moreover, although the said embodiment demonstrated the case where a disclosed technique was applied to the refrigerant | coolant heat exchanger 20, it is not limited to this. It is effective to apply the disclosed technology to heat exchangers other than the refrigerant heat exchanger 20. For example, the heat exchanger may be a radiator, an oil cooler, or the like.

20 Refrigerant heat exchanger (heat exchanger)
22, 322 Channel partition members 31, 231 Tube portion 41 Carbon fiber (first carbon fiber)
42 Carbon fiber (second carbon fiber)

Claims (10)

In a heat exchanger that provides heat exchange between a heat transport medium and a heat exchange medium,
A flow path partition member (22, 322) made of carbon fiber reinforced plastic that provides pipe portions (31, 231) that partition the heat medium flow path through which the heat transport medium flows;
The carbon fiber reinforced plastic includes a first fiber group having a plurality of first carbon fibers (41) and a second fiber group having a plurality of second carbon fibers (42) shorter than the first carbon fibers. And
The first fiber group extends so that each of the first carbon fibers surrounds the heat medium flow path,
In the second fiber group, a plurality of the second carbon fibers are oriented in a direction intersecting the extending direction of the first carbon fibers, or a plurality of the second carbon fibers are randomly arranged. A heat exchanger in an oriented state.   2. The heat exchanger according to claim 1, further comprising a heat transfer member (32, 328) provided outside the tube portion and configured to widen a contact area with the heat exchange medium.   The heat exchanger according to claim 2, wherein the heat transfer member (32) is provided by the flow path partition member and is made of carbon fiber reinforced plastic.   The heat exchanger according to claim 3, wherein the heat transfer member is a plate portion (32) extending from the tube portion.   The heat exchanger according to claim 4, wherein the first carbon fiber extends through the plate portion so as to extend from the tube portion.   The heat exchanger according to claim 4 or 5, wherein the first carbon fiber extends over both the tube portion and the plate portion.   The heat exchanger according to claim 6, wherein the first carbon fibers extend over the entire width of the flow path partition member along the flow direction (AF) of the heat exchange medium. The flow path partition member has a plurality of the tube portions and a plurality of the plate portions,
The heat exchanger according to any one of claims 5 to 7, wherein the first carbon fiber extends over all of the plurality of tube portions and the plurality of plate portions.   The heat exchanger according to claim 2, wherein the heat transfer member (328) is a separate member from the flow path partition member.   The heat exchanger according to any one of claims 1 to 9, wherein the first carbon fiber is a PAN-based carbon fiber, and the second carbon fiber is a pitch-based carbon fiber.

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