JP4334311B2 - Heat exchanger - Google Patents

Description

  The present invention includes a core formed by stacking tubes and fins, a tank connected to the ends of the tubes, and a reinforcing member that is disposed at the end of the core in the stacking direction and is supported by the tank at the end. The present invention relates to a heat exchanger that exchanges heat with heat transmitted to a core through a tube.

  As heat exchangers such as radiators and evaporators used in the refrigeration cycle, a plurality of flat tubes and corrugated fins are alternately stacked to form a core, and the end of the tube is connected to a tank. What is known. The refrigerant is taken into the inside from the tank, flows through the tube while exchanging heat with the heat transmitted to the core, and then discharged from the tank to the outside.

  In general, as a reinforcing member that improves the mechanical strength of such a heat exchanger, a member that is disposed at the end of the core in the stacking direction and whose end is supported by a tank is known. Patent Documents 1 to 10 disclose heat exchangers including this type of reinforcing member.

Further, as refrigerants for the refrigeration cycle, chlorofluorocarbon refrigerants, including alternative chlorofluorocarbons, have been widely used so far, and in recent years, there is a tendency to change them to CO ₂ in consideration of the global environment. The refrigeration cycle using CO ₂ as a refrigerant has an extremely high internal pressure compared to the refrigeration cycle using a fluorocarbon refrigerant, and the pressure on the high pressure side in particular exceeds the critical point of the refrigerant depending on the use conditions such as the temperature. . The critical point is a limit on the high-pressure side (that is, a limit on the high-temperature side) where the gas layer and the liquid layer coexist, and is an end point on one side of the vapor pressure curve. The pressure, temperature, and density at the critical point are the critical pressure, critical temperature, and critical density, respectively. In particular, in a radiator that is a high-temperature heat source part of the refrigeration cycle, the refrigerant does not condense when the pressure exceeds the critical point of the refrigerant. Patent Document 11 discloses an excellent heat exchanger that is suitably used in such a supercritical refrigeration cycle.
Japanese Patent No. 3156565 Noto 2518550 Japanese Utility Model Publication No. 5-96788 Japanese Patent Laid-Open No. 10-197188 Japanese Patent Laid-Open No. 10-332293 JP 2001-12821 A JP 2002-243387 A JP 2002-286393 A JP 2003-4395 A JP 2003-42683 A WO03 / 040640 pamphlet

  By the way, with respect to the heat exchanger of the refrigeration cycle, improvement of heat exchange efficiency of the refrigerant, reduction in size, weight reduction, ease of manufacture, and saving of installation space are important issues. In particular, a supercritical refrigeration cycle in which the pressure on the high pressure side exceeds the critical point of the refrigerant requires a very high pressure resistance compared to a refrigeration cycle that uses a fluorocarbon refrigerant. There is a need for further rationalization as well as ensuring safety.

  For example, in a heat exchanger for a supercritical refrigeration cycle, it is necessary to reduce the volume of tubes and tanks and to increase the wall thickness in terms of ensuring pressure resistance. Further, with respect to the above-described reinforcing member, further structural contrivance is required in order to cope with such thickening and small diameter of the tank.

  This invention is made | formed in view of this situation, The objective is to provide the heat exchanger which comprises a reinforcement member rationally.

The invention described in claim 1 of the present application is arranged at the end of the core in which the tubes and fins are stacked, the tank connecting the ends of the tubes, and the stacking direction of the cores. A heat exchanger that includes a reinforcing member supported by a tank and that exchanges heat with heat transmitted to the core by a medium flowing through the tube.
The tank is provided with a tube insertion hole for inserting an end portion of the tube, and a reinforcing member insertion hole for inserting an end portion of the reinforcing member,
The reinforcing member is formed by processing a strip-shaped material having a constant width, and includes a first portion facing the core and a second portion protruding from the first portion, and the second portion . Is a rib formed by bending the widthwise end of the strip-shaped material in the longitudinal direction of the material, and the end inserted into the reinforcing member insertion hole extends from the second portion. It is a heat exchanger.

  The invention described in claim 2 of the present application is the throttle portion according to claim 1, wherein the reinforcing member reduces the width of the first portion toward the end portion and increases the width of the second portion. It is a heat exchanger of composition provided with.

The invention described in claim 3 of the present application is the member according to claim 1 or 2 , wherein the member constituting the tank includes a member provided with the tube insertion hole and the reinforcement member insertion hole. The heat exchanger has the same configuration as the tube insertion hole.

The invention described in claim 4 of the present application is the member according to any one of claims 1 to 3 , wherein the member constituting the tank is a member provided with the tube insertion hole and another member provided with the reinforcing member insertion hole. It is a heat exchanger of composition provided with a member.

In the invention described in claim 5 of the present application, in any one of claims 1 to 4 , the tube is a flat type whose end is twisted, and the long diameters of the tube insertion hole and the reinforcing member insertion hole are Is a heat exchanger having a configuration aligned in the longitudinal direction of the tank.

The invention described in claim 6 of the present application is the heat exchanger according to any one of claims 1 to 5, which is configured to be used for a refrigeration cycle in which the pressure on the high pressure side exceeds the critical point of the refrigerant.

  ADVANTAGE OF THE INVENTION According to this invention, the heat exchanger which comprises a reinforcement member rationally can be obtained.

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. A refrigeration cycle 1 shown in FIG. 1 is an in-vehicle air conditioning refrigeration cycle mounted on an automobile, and includes a compressor 2 that compresses refrigerant, a radiator 100 that cools the refrigerant compressed by the compressor 2, and a radiator 100. An expansion valve 3 that expands by depressurizing the cooled refrigerant, an evaporator 4 that evaporates the refrigerant depressurized by the expansion valve 3, and a refrigerant that flows out of the evaporator 4 is separated into a gas layer and a liquid layer, and the refrigerant in the gas layer And an internal heat exchanger 6 that improves cycle efficiency by exchanging heat between the high-pressure side refrigerant and the low-pressure side refrigerant. CO ₂ is used as the refrigerant, and the pressure on the high-pressure side of the supercritical refrigeration cycle 1 exceeds the critical point of the refrigerant depending on the use conditions such as the temperature. The arrows in FIG. 1 indicate the refrigerant circulation direction.

  As shown in FIGS. 2 to 4, the radiator 100 as a heat exchanger of the present example is formed by alternately laminating flat tubes 210 through which a refrigerant (that is, a medium) flows and corrugated fins 220. 1st core 200a, 2nd core 200b, the 1st tank 300a in which the end of each tube 210 was inserted and connected, the 2nd tank 300b, the 3rd tank 300c, and the 1st tank 300a are provided. The refrigerant inlet 400 and the refrigerant outlet 500 provided in the third tank 300c are provided. Each of the tanks 300a, 300b, and 300c has a tubular shape whose upper and lower ends are closed by a closing member 330. Reinforcing members 600 are disposed at upper and lower ends in the stacking direction of the first core 200a and the second core 200b, respectively. The reinforcing member 600 extends over the first core 200a and the second core 200b, and the end portions 630 of the reinforcing member 600 are supported by the tanks 300a, 300b, and 300c, respectively.

  The refrigerant sent from the compressor 2 flows from the inlet 400. The refrigerant flowing out from the outlet portion 500 is sent to the expansion valve 3. In addition, the arrow in FIG. 2 has shown the distribution direction of the refrigerant | coolant in the heat radiator 100, and the white arrow has shown the ventilation direction with respect to the 1st core 200a and the 2nd core 200b.

  One end of the tube 210 of the first core 200a is connected to the first tank 300a. The other end of the tube 210 of the first core 200a and one end of the tube 210 of the second core 200b are connected to the second tank 300b. The other end of the tube 210 of the second core 200b is connected to the third tank 300c.

  The first core 200a and the second core 200b are ventilated by a fan (not shown), and the refrigerant performs heat exchange with heat transmitted to the first core 200a and the second core 200b. Further, the first core 200a and the second core 200b are configured to overlap in the ventilation direction, and the flat surface of the tube 210 is parallel to the ventilation direction. Ventilation is applied from the second core 200b side. That is, the radiator 100 of this example is a counter flow type heat exchanger in which the refrigerant flows in the first core 200a and the second core 200b are counterflows.

  The radiator 100 includes a tube 210, fins 220, a first tank 300a, a second tank 300b, a third tank 300c, an inlet portion 400, an outlet portion 500, and a plurality of aluminum alloys constituting the reinforcing member 600. After assembling the manufactured members together, the assembly is manufactured by brazing in a furnace. Further, when brazing in such a furnace, brazing materials and fluxes necessary for brazing are provided at the key points of each member.

  As shown in FIG. 5, the tube 210 of this example is an extruded tube made of an aluminum alloy having a plurality of flow paths 211. The end of the tube 210 is twisted in a predetermined direction by processing after extrusion. Specifically, the width direction of both ends of the tube 210 is twisted by 90 ° with respect to the ventilation direction.

As shown in FIG. 6, the first tank 300 a has a space between the first tank member 310 and the second tank member 320 that are assembled with each other to form a tubular shape, and between the first tank member 310 and the second tank member 320. And a closing member 330 for closing. In the longitudinal direction of the first tank member 310, tube insertion holes 311 for inserting the end portions of the tubes 210 are provided in a row at a predetermined pitch. Reinforcing member insertion holes 312 for inserting the end portions 630 of the reinforcing member 600 are provided at both ends in the longitudinal direction. The long diameters of the tube insertion hole 311 and the reinforcing member insertion hole 312 are aligned in the longitudinal direction of the first tank 300c. This is a configuration corresponding to the reduction in the diameter of the first tank 300c accompanying the securing of the pressure strength. Further, the second tank member 320 has an end face joining surface 321 that joins the end face 312 of the first tank member 310, a rib 322 that positions the first tank member 310, and the first tank member 310 in the longitudinal direction. A bent portion 323 that is bent after the bending is provided. The first tank member 310 is held by the second tank member 320 by bending the bent portion 323. In addition, a fitting portion 324 for fitting the closing member 330 is provided at a key point of the second tank member 320. The closing member 330 is a plate having edges that match the inner peripheral surfaces of the first tank member 310 and the second tank member 320, and the first tank member and the second tank member have the closing member 330 therebetween. Assembled in a sandwiched state. In the case of this example, the closing member 330 is disposed between the tube insertion hole 311 and the reinforcing member insertion hole 312 with respect to the first tank member 310. The bent portion 323 is bent over the entire length of the second tank member 320 in the longitudinal direction. Or you may bend | fold partially. The end of the tube 210 and the end 630 of the reinforcing member 600 are inserted into the tube insertion hole 311 before or after assembling the first tank member 310 and the second tank member 320. In the above-described brazing in the furnace, the end portion of the tube 210 and the tube insertion hole 311, the end portion 630 and the reinforcement member insertion hole 312 of the reinforcing member 600, the end surface 312 of the first tank member 310 and the second tank member 320. The end face joining surface 321 is brazed.

  On the other hand, as shown in FIG. 7, the second tank 300b is also formed between the first tank member 310 and the second tank member 320 that are assembled with each other to form a tubular shape, and between the first tank member 3210 and the second tank member 320. And a closing member 330 for closing the space. In the longitudinal direction of the first tank member 310, tube insertion holes 311 for inserting the end portions of the tubes 210 are provided in two rows at a predetermined pitch. Other configurations are the same as those of the first tank 300a.

  As shown in FIG. 8, the reinforcing member 600 of the present example is formed by press forming or roll forming a strip-shaped material having a constant width, and the first core 200a and the second core 200b are opposed to each other. And a second part 620 protruding from the first part 610. The second portion 620 is a rib formed by vertically bending the end portion in the width direction of the strip-shaped material along the longitudinal direction of the material. The first portion 610 is provided with a long hole 611 that increases the thermal resistance between the first core 200a and the second core 200b. The end portions 630 to be inserted into the reinforcing member insertion holes 312 extend from the second portion 620, respectively. The end portion 630 may be bent in a crank shape according to the position of the reinforcing member insertion hole 312. According to such a configuration, the reinforcing member 600 can be reduced in size and weight, and the strength and manufacturability of the reinforcing member 600 and the heat exchange efficiency of the refrigerant can be satisfactorily ensured.

  As described above, the radiator 100 according to the present example secures a required pressure resistance according to the refrigerant that is in a supercritical state, and rationalizes the reinforcing member according to the diameter reduction of each of the tanks 300a, 300b, and 300c. It can be used very suitably as a heat exchanger for the supercritical refrigeration cycle 1 mounted on an automobile. In addition, the configuration of each part in this example can be appropriately changed in design within the technical scope described in the claims, and is of course not limited to the illustrated example. Such a configuration of the reinforcing member 600 can be applied to other heat exchangers such as the evaporator 4 and the internal heat exchanger 6.

  Next, a second embodiment of the present invention will be described with reference to FIG. As shown in the figure, the reinforcing member 600 of this example includes a throttle portion 601 that reduces the width of the first portion 610 toward the end portion 630 and increases the width of the second portion 620. It is. That is, according to the present example, the reinforcing member 600 for each of the tanks 300a, 300b, and 300c is set by increasing the width of the end portion 630 extending from the second portion 620 while effectively using a strip-shaped material having a constant width. It is possible to improve the supporting strength. Other configurations are the same as those in the above-described embodiment.

  As described above, it is more reasonable to provide the reinforcing member 600 with the throttle portion 601.

  Next, a third embodiment of the present invention will be described with reference to FIGS. As shown in these drawings, the reinforcing member insertion hole 312 of this example is the same type as the tube insertion hole 311. According to such a configuration, when the tube insertion hole 311 and the reinforcing member insertion hole 312 are formed, it is not necessary to distinguish them, so that the versatility of the mold for manufacturing the first tank member 310 can be improved. . For example, when manufacturing the 1st tank member 310 from which the number of tube insertion holes 311 differs, the raw material which arranged the hole of a fixed shape or the material to arrange is predetermined length according to the number of the tube insertion holes 311 This can be obtained by cutting into pieces.

  Further, in the case of this example, the end portion 630 of the reinforcing member 600 is obtained by simulating the end portion shape of the tube 210, and the closing member 330 is more than the reinforcing member insertion hole 312 with respect to the first tank member 310. It arrange | positions near the longitudinal direction edge part. A fitting portion 313 for fitting the convex portion 331 provided on the closing member 330 is provided at a main point of the first tank member 310.

  The end portion 630 of the reinforcing member 600 is a main body member disposed at the end in the stacking direction of the first core 200a and the second core 200b, that is, a member constituting the first portion 610 and the second portion 620, and other members. A member 631 is provided. The member 631 constituting the end portion 630 is provided with a fitting portion 632 into which the convex portion 612 provided at the end portion of the first portion 610 is fitted. That is, if the end portion 630 of the reinforcing member 600 is provided integrally with another portion, it may be difficult to simulate the end shape of the tube 210. In such a case, the reinforcing member 600 may be configured by providing another member 631 on the members constituting the first portion 610 and the second portion 620. Other configurations are the same as those in the above-described embodiment.

  Thus, it is more reasonable if the reinforcing member insertion hole 312 has the same shape as the tube insertion hole 311. In addition, the reinforcing member 600 can be configured by providing another member 631 to the members constituting the first portion 610 and the second portion 620.

  Next, a fourth embodiment of the present invention will be described with reference to FIGS. As shown in these drawings, each of the tanks 300a, 300b, and 300c in this example includes a first tank member 310 and a second tank member 320 that are assembled with each other to form a tubular shape, and a first tank member 3210 and a second tank member. 320 is provided with a closing member 330 that closes a space between 320 and a reinforcing member support member 430 provided with a reinforcing member insertion hole 341. In the longitudinal direction of the first tank member 310, tube insertion holes 311 for inserting the ends of the tubes 210 are provided at a predetermined pitch.

  Similar to the first tank member 310, the reinforcing member support member 430 is positioned on the rib 322 of the second tank, and is provided with the end face joined to the end face joining face 321 of the second tank member 320. Further, the bent portion 323 is bent and held by the second tank member 320 together with the first tank member 310. The closing member 330 is provided between the first tank member 310 and the reinforcing member support member 340. According to such a configuration, the manufacture of the first tank member 310 can be facilitated. That is, in the case where the non-homogeneous tube insertion hole 311 and the reinforcing member insertion hole 312 are provided in the first tank member 310, there is a disadvantage in that the versatility of the mold is restricted. Such inconvenience can be avoided. For example, when manufacturing the 1st tank member 310 from which the number of tube insertion holes 311 differs, the raw material which arranged the hole of a fixed shape or the material to arrange is predetermined length according to the number of the tube insertion holes 311 This can be obtained by cutting into pieces. Other configurations are the same as those in the above-described embodiment.

  Thus, each tank 300a, 300b, 300c may be provided with the member 310 provided with the tube insertion hole 311 and the other member 340 provided with the reinforcing member insertion hole 341.

  The heat exchanger of the present invention can be suitably used as a radiator for a refrigeration cycle.

It is explanatory drawing which concerns on the Example of this invention and shows a refrigerating cycle. (First embodiment) It is explanatory drawing which concerns on the Example of this invention and shows the outline | summary of a heat exchanger. (First embodiment) It is a front sectional view showing an important section of a heat exchanger concerning an example of the present invention. (First embodiment) 1 is a top view showing a heat exchanger according to an embodiment of the present invention. (First embodiment) It is a sectional view showing a tube concerning an example of the present invention. (First embodiment) According to an embodiment of the present invention, for the first tank, (a) a top view showing the first tank member, (b) a front view showing the first tank member, (c) a top view showing the second tank member, (D) The front view which shows the 2nd tank member, (e) The top view which shows a closing member, (f) The front view which shows a closing member. (First embodiment) According to the embodiment of the present invention, for the second tank, (a) a top view showing the first tank member, (b) a front view showing the first tank member, (c) a top view showing the second tank member, (D) The front view which shows the 2nd tank member, (e) The top view which shows a closing member, (f) The front view which shows a closing member. (First embodiment) It is related with the Example of this invention, (a) The top view which shows a reinforcement member, (b) The front view which shows a reinforcement member. (First embodiment) It is related with the Example of this invention, (a) The top view which shows a reinforcement member, (b) The front view which shows a reinforcement member. (Second embodiment) It is a front sectional view showing an important section of a heat exchanger concerning an example of the present invention. (Third embodiment) 1 is a top view showing a heat exchanger according to an embodiment of the present invention. (Third embodiment) According to an embodiment of the present invention, for the first tank, (a) a top view showing the first tank member, (b) a front view showing the first tank member, (c) a top view showing the second tank member, (D) The front view which shows the 2nd tank member, (e) The top view which shows a closing member, (f) The front view which shows a closing member. (Third embodiment) According to the embodiment of the present invention, for the second tank, (a) a top view showing the first tank member, (b) a front view showing the first tank member, (c) a top view showing the second tank member, (D) The front view which shows the 2nd tank member, (e) The top view which shows a closing member, (f) The front view which shows a closing member. (Third embodiment) It is related with the Example of this invention, (a) The top view which shows a reinforcement member, (b) The front view which shows a reinforcement member. (Third embodiment) It is an exploded top view showing an example of the present invention, (a) an exploded top view showing a reinforcing member, and (b) an exploded front view showing a reinforcing member. (Third embodiment) It is a front sectional view showing an important section of a heat exchanger concerning an example of the present invention. (Fourth embodiment) 1 is a top view showing a heat exchanger according to an embodiment of the present invention. (Fourth embodiment) According to an embodiment of the present invention, for the first tank, (a) a top view showing the first tank member, (b) a front view showing the first tank member, (c) a top view showing the second tank member, (D) Front view showing second tank member, (e) Top view showing closing member, (f) Front view showing closing member, (g) Top view showing reinforcing member supporting member, (h) Reinforcing member supporting It is a front view which shows a member. (Fourth embodiment) According to the embodiment of the present invention, for the second tank, (a) a top view showing the first tank member, (b) a front view showing the first tank member, (c) a top view showing the second tank member, (D) Front view showing second tank member, (e) Top view showing closing member, (f) Front view showing closing member, (g) Top view showing reinforcing member supporting member, (h) Reinforcing member supporting It is a front view which shows a member. (Fourth embodiment)

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Refrigerating cycle 2 Compressor 3 Expansion valve 4 Evaporator 5 Accumulator 6 Internal heat exchanger 100 Radiator 200a 1st core 200b 2nd core 210 Tube 211 Flow path 220 Fin 300a 1st tank 300b 2nd tank 300c 3rd tank 310 First tank member 311 Tube insertion hole 312 Reinforcement member insertion hole 313 Fitting portion 320 Second tank member 321 End surface joint surface 322 Rib 323 Bending portion 324 Fitting portion 330 Closure member 331 Protruding portion 340 Reinforcement member support member 341 Reinforcement member Insertion hole 400 Inlet part 500 Outlet part 600 Reinforcing member 601 Restriction part 610 First part 611 Long hole 612 Convex part 620 Second part 630 Reinforcing member end part 631 Member constituting end part 632 Fitting part

Claims (6)

A core formed by stacking tubes and fins, a tank to which the ends of the tubes are connected, and a reinforcing member disposed at the end of the core in the stacking direction and supported by the tank at the ends. In the heat exchanger for exchanging heat with the heat transmitted to the core by the medium flowing through the tube,
The tank is provided with a tube insertion hole for inserting an end portion of the tube, and a reinforcing member insertion hole for inserting an end portion of the reinforcing member,
The reinforcing member is formed by processing a strip-shaped material having a constant width, and includes a first portion facing the core and a second portion protruding from the first portion, and the second portion . The portion is a rib formed by bending the widthwise end of the strip-shaped material over the longitudinal direction of the material, and the end inserted into the reinforcing member insertion hole extends from the second portion. A heat exchanger characterized by   2. The heat exchanger according to claim 1, wherein the reinforcing member includes a throttle portion that reduces the width of the first portion toward the end portion and increases the width of the second portion. . The member constituting the tank includes a member provided with the tube insertion hole and the reinforcing member insertion hole,
The heat exchanger according to claim 1 or 2 , wherein the reinforcing member insertion hole has the same shape as the tube insertion hole . 4. The heat according to claim 1, wherein the member constituting the tank includes a member provided with the tube insertion hole and another member provided with the reinforcing member insertion hole. Exchanger. The tube is of a flat type whose end is twisted,
5. The heat exchanger according to claim 1 , wherein major diameters of the tube insertion hole and the reinforcing member insertion hole are aligned in a longitudinal direction of the tank . 6. The heat exchanger according to claim 1, wherein the heat exchanger is used for a refrigeration cycle in which a pressure on a high pressure side exceeds a critical point of the refrigerant .

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