JP5851846B2 - Heat exchanger and manufacturing method thereof - Google Patents

Description

  The present invention relates to a heat exchanger used as, for example, an evaporator, a condenser or a heater of a vehicle air conditioner and a method for manufacturing the same.

  Conventionally, as this kind of heat exchanger, a cylindrical header for heat medium distribution and a plurality of heat medium distribution holes arranged at intervals in the axial direction of the header and connected to the side surfaces of the header, respectively. It is known that each tube is connected to the side surface of the header by inserting the ends of each tube into a plurality of connection holes provided on the side surface of the header. Reference 1).

Japanese Patent No. 4451981

  However, in the heat exchanger, since the end of each tube is inserted into a header provided with a connection hole in advance, one tube must be inserted into each connection hole. There was a problem that became complicated. In particular, in so-called finless type heat exchangers in which flat tubes are arranged at narrow intervals without using fins, it is necessary to increase the heat transfer area by the surface of the tube, so the number of tubes increases, There was a problem that the tube insertion work was complicated accordingly. In addition, when the horizontally long connection holes into which the flat tubes are inserted are provided so as to be close to each other, the portion between the connection holes becomes elongated, and it is difficult to punch the connection holes into the header. It was.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a heat exchanger that can easily connect each tube to a header even when the number of tubes is large, and a method for manufacturing the same. It is to provide.

In order to achieve the above-mentioned object, the present invention provides a header for circulating a heat medium formed in a cylindrical shape, and a plurality of heat mediums arranged at intervals in the axial direction of the header and connected to the side surfaces of the header, respectively. In a heat exchanger provided with a distribution tube, and provided with a plurality of connection holes to which the end portions of the respective tubes are connected on the side surfaces of the header, the header is joined to each other in the axial direction of the header. Formed by the divided members, and provided with a notch portion forming a part of the connection hole in at least one of the joint end surfaces of both ends of each of the divided members, and between the joint end surfaces of the divided members to be joined to each other the notches to form a connection hole, the joining end surfaces of the dividing member, an engaging portion that engages so as to restrict the radial movement of the header provided with each other, the axial direction of the dividing member engaging portion It is formed from a recess formed on the end surface of the convex portion and the other axial provided on one end face.

In order to achieve the above object, the present invention provides a cylindrical header for heat medium distribution and a plurality of heat medium distributions that are arranged at intervals in the axial direction of the header and are respectively connected to the side surfaces of the header. In the heat exchanger manufacturing method, the headers are joined to each other in the axial direction of the header. A plurality of divided members are formed, and at least one of the bonded end surfaces of each divided member is provided with a cutout portion forming a part of the connection hole, and the tube end portion is a cutout portion of the divided member. with stacked alternately a dividing member and the tube so as to engage the header to each other and a recess formed in the convex portion and the end face of the other axial provided on one axial end surface of each divided member By engaging so as to restrict the movement of the radial direction, the ends of each tube is to form a header respectively connected to the respective connection holes.

As a result, the divided member and the tube are alternately stacked so that the end of each tube is engaged with the notch of the divided member, thereby forming a header in which the end of each tube is connected to each connection hole. can do. In addition, since the convex portions and the concave portions as the engaging portions provided on the joining end surfaces of the respective divided members engage with each other so as to restrict the movement of the header in the radial direction, The members are easily and accurately positioned.

According to the present invention, it is possible to easily form headers in which the end portions of the respective tubes are connected to the respective connection holes, so that the assembly work is not complicated even when the number of tubes is large, and the productivity is increased. Can be improved. Further, when the divided members are stacked, the divided members can be positioned easily and accurately, so that the assembling work can be performed efficiently.

The perspective view of the heat exchanger which shows the 1st Embodiment of this invention Top side perspective view of header member Bottom perspective view of header member Rear sectional view of header member Rear cross-sectional view of upper lid member Rear cross-sectional view of the lower lid member Partial perspective view of tube Side cross-sectional view of tube Perspective view showing assembly process of header Perspective view showing assembly process of header Partial rear sectional view showing the assembly process of the header Partial rear sectional view of the header Front sectional view of the heat exchanger showing the flow state of the heat medium Configuration diagram of heat pump circuit showing cooling operation Configuration diagram of heat pump circuit showing heating operation The upper surface side perspective view of the partition member which shows the 2nd Embodiment of this invention Rear sectional view of partition member Front sectional view of the heat exchanger showing the flow state of the heat medium Side sectional view showing a modification of the tube Sectional drawing which shows the assembly process of the header which concerns on the 3rd Embodiment of this invention Partial rear sectional view of the header

  FIGS. 1 to 13 show a first embodiment of the present invention, for example, a finless heat exchanger used as an evaporator, a condenser or a heater of a vehicle air conditioner.

  This heat exchanger is composed of a pair of heat medium distribution headers 10 and a plurality of heat medium distribution tubes 20 that are spaced apart from each other in the axial direction of each header 10. Both ends are connected to the side surface of each header 10.

  Each header 10 is formed in a rectangular tube shape extending in the up-down direction, and is arranged at intervals in the width direction of the heat exchanger. The side surface (circumferential wall surface) of the header 10 is provided with a plurality of connection holes 10a to which end portions of the tubes 20 are connected, and the connection holes 10a are arranged at equal intervals in the vertical direction. The header 10 includes a plurality of header members 11 joined to each other in the axial direction of the header 10, an upper lid member 12 that closes the upper end of the header 10, and a lower lid member 13 that closes the lower end of the header 10, Each header member 11 and each lid member 12 and 13 form a division member.

  Each header member 11 is made of a molded product of metal such as aluminum, and is formed in an annular shape so as to form a part in the axial direction of the peripheral wall of the header 10. Each header member 11 is joined to each other by abutting an end face in the vertical direction (joint end face) with an end face in the vertical direction of the other header member 11. A notch portion 14 is provided that forms part of 10a. The notches 14 are formed in a horizontally long shape, and a plurality of uneven portions are alternately provided in the width direction on the bottom surface. Further, an engaging portion that engages with another header member 11 is provided on the end surface in the vertical direction of the header member 11, and the engaging portion is provided with a convex portion 15 provided on one end surface in the vertical direction of the header member 11. It is formed from the recessed part 16 provided in the other end surface of the up-down direction. The convex portion 15 and the concave portion 16 are formed so as to extend in the circumferential direction of the header member 11 from both ends of the notch portion 14, and are engaged with each other to move the header 10 in the radial direction (direction orthogonal to the axial direction). It comes to regulate.

  The upper lid member 12 is configured such that the upper end surface is closed by the upper surface portion 12 a and the lower end surface thereof is joined to the upper end surface of the header member 11. A peripheral wall portion of the upper lid member 12 has the same outer shape as the header member 11, and a notch portion 14 and a concave portion 16 similar to the header member 11 are provided on the lower end surface thereof.

  The lower lid member 13 is closed at the lower end surface by the bottom surface portion 13 a and is joined to the lower end surface of the header member 11 at the lower end surface. A peripheral wall portion of the lower lid member 13 has the same outer shape as the header member 11, and a cutout portion 14 and a convex portion 15 similar to those of the header member 11 are provided on the upper end surface thereof.

  Each tube 20 is made of an extruded product of metal such as aluminum, and is formed in a flat shape in which the vertical dimension is smaller than the width dimension. The tube 20 is provided with a plurality of flow channels 21 for circulating the heat medium at equal intervals in the width direction, and the inner shape of each flow channel 21 is formed in a square shape. A plurality of uneven portions are alternately provided in the width direction on the upper surface and the lower surface of the tube 20, and these uneven portions engage with the uneven portions of the notch portion 14. In this case, the concavo-convex portion of the tube 20 is formed such that the portions located above and below each flow channel 21 are convex, and the portions located between the flow channels 21 are concave.

As shown in FIGS. 9 and 11, the heat exchanger configured as described above has the header member 11 and the tube 20 alternately so that the end of each tube 20 engages with the notch 14 of the header member 11. As shown in FIG. 10 and FIG. 12, each tube has a connection hole 10a formed by the cutout portion 14 of one header member 11 and the cutout portion 14 of the other header member 11 joined together. A header 10 is formed in which the ends of 20 are connected to the respective connection holes 10a. At that time, the upper lid member 12 and the lower lid member 13 are disposed at the upper end and the lower end of each header 10, and the upper lid member 12 of one header 10 is provided with an inflow pipe 17 for heat medium inflow. The lower cover member 13 of the other header 10 is provided with an outflow pipe 18 for outflow of the heat medium. In addition, when the header members 11 and the lid members 12 and 13 are stacked, the convex portions 15 and the concave portions 16 of the joint end surfaces thereof are engaged with each other, and the header members 11 and the lid members 12 are formed by the convex portions 15 and the concave portions 16. , movement in the radial direction 13 is crucified regulations. Then, each header member 11, each lid member 12, 13, each pipe 17, 18 and each tube 20 are joined by brazing in a furnace.

  In the heat exchanger, as shown in FIG. 13, the heat medium flowing into the one header 10 from the inflow pipe 17 flows through the tubes 20 from the one header 10 and flows into the other header 10. It flows out from the outflow pipe 18 of the header 10. At that time, the heat medium flowing through each tube 20 and the fluid flowing outside each tube 20 are subjected to heat exchange.

  As described above, according to the present embodiment, the header 10 is formed by the plurality of header members 11 and the lid members 12 and 13 as the divided members joined to each other in the axial direction, and each header member 11 and each lid member. A cutout portion 14 forming a part of the connection hole 10a is provided on the joining end surfaces of the first and second header members 13 and 13, and the connection hole is formed by the cutout portion 14 of one header member 11 and the cutout portion 14 of the other header member 11 that are joined together 10a is formed, the header member 11 and the tube 20 are alternately stacked so that the end of each tube 20 engages with the notch portion 14 of the header member 11, so that the end of each tube 20 is The header 10 connected to each connection hole 10a can be formed. As a result, each tube 20 can be easily connected to the header 10, and assembly work is not complicated even in a finless heat exchanger having a large number of tubes 20, thereby improving productivity. it can. Further, since it is not necessary to drill the connection holes 10a in the header 10 by punching, the connection holes 10a can be formed even when the interval between the tubes 20 is narrow, and the finless heat exchange with a small pitch of the tubes 20 is possible. Very advantageous for the vessel.

  Moreover, since the convex part 15 and the concave part 16 as an engaging part which engage so that the movement to the radial direction of the header 10 mutually may be provided in the joining end surface of each header member 11, each header member 11 is stacked. At this time, the header members 11 can be easily and accurately positioned, and the assembly work can be performed efficiently.

  In this case, since the convex portion 15 and the concave portion 16 are formed so as to extend in the circumferential direction of the header member 11, it is possible to seal between the header members 11 by the convex portion 15 and the concave portion 16, and to seal between the header members 11. Can increase the sex.

  14 and 15 show circuit diagrams of a heat pump type vehicle air conditioner using the heat exchanger as an evaporator, an outdoor heat exchanger or a heater.

  The heat pump circuit shown in the figure includes a compressor 30 that discharges refrigerant, a heater 31 that is connected to the downstream side of the compressor 30, a first expansion valve 32 that is connected to the downstream side of the heater 31, and a first The outdoor heat exchanger 33 connected to the downstream side of the expansion valve 32, the second expansion valve 34 connected to the downstream side of the outdoor heat exchanger 33, and the downstream side of the second expansion valve 34. A connected evaporator 35 and an accumulator 36 connected to the downstream side of the evaporator 35 are provided, and a compressor 30 is connected to the downstream side of the accumulator 36. A first bypass circuit 37 that bypasses the first expansion valve 32 is provided downstream of the heater 31, and the first bypass circuit 37 is opened and closed by a first electromagnetic valve 38. A second bypass circuit 39 that bypasses the second expansion valve 34 and the evaporator 35 is provided on the downstream side of the outdoor heat exchanger 33, and the second bypass circuit 39 is provided by the second electromagnetic valve 40. It opens and closes. Moreover, the heater 31 and the evaporator 35 are arrange | positioned in the duct 50 which distribute | circulates the indoor air of a vehicle.

  In the air conditioner, when the cooling operation is performed, the first electromagnetic valve 38 of the heat pump circuit is opened, and the second electromagnetic valve 40 is closed. As a result, as shown in FIG. 14, the refrigerant discharged from the compressor 30 flows in sequence to the heater 31, the outdoor heat exchanger 33, the second expansion valve 34, the evaporator 35, and the accumulator 36, and the compressor 30. The air flowing through the duct 50 is cooled by the evaporator 35.

  In the air conditioner, when the cooling operation is performed, the first electromagnetic valve 38 of the heat pump circuit 30 is closed and the second electromagnetic valve 40 is opened. As a result, as shown in FIG. 15, the refrigerant discharged from the compressor 30 sequentially flows through the heater 31, the first expansion valve 32, the outdoor heat exchanger 33, and the accumulator 36 and is sucked into the compressor 30. The air flowing through the duct 50 is heated by the heater 31.

  FIGS. 16 to 18 show a second embodiment of the present invention, and the same reference numerals are given to the same components as those of the above-described embodiment.

  The header 10 in the heat exchanger of the present embodiment has a partition member 19 that partitions the inside of the header 10 in the axial direction, and the partition member 19 forms a part of the divided members that constitute the header 10. A peripheral wall portion of the partition member 19 has the same outer shape as the header member 11, and a cutout portion 14, a convex portion 15, and a concave portion 16 similar to those of the header member 11 are provided on the upper end surface and the lower end surface thereof. Moreover, the partition part 19a is provided inside the partition member 19, and the inside of the partition member 19 is partitioned up and down by the partition part 19a.

  In the present embodiment, one partition member 19 is disposed on the upper side in the axial direction of one header 10, and another partition member 19 is disposed on the lower side in the axial direction of the other header 10. In this case, the partition member 19 is disposed between the header members 11 and is joined to the upper and lower header members 11, respectively.

  In the heat exchanger of the present embodiment, as shown in FIG. 18, the heat medium that has flowed into the upper part of the partition member 19 in one header 10 from the inflow pipe 17 is about 1/3 of the tube 20 above the one header 10. And flows into the upper part of the partition member 19 in the other header 10, flows through about 1/3 of the tube 20 on the center side in the vertical direction, and flows into the lower part of the partition member 19 in the one header 10. Thereafter, the heat medium below the partition member 19 in one header 10 flows from the one header 10 through the lower tube about 20 and flows below the partition member 19 in the other header 10. , And flows out from the outflow pipe 18 of the other header 10. That is, the heat medium flows in a meandering manner through each tube 20, and heat exchange between the heat medium flowing through each tube 20 and the fluid flowing outside each tube 20 is performed.

  Thus, according to the present embodiment, some of the divided members constituting the header 10 are formed by the partition member 19, and the interior of the header 10 is axially formed by the partition portion 19 a provided on the partition member 19. Therefore, the heat medium flowing through each tube 20 can be circulated in a meandering manner, and the heat exchange efficiency can be improved.

  In the second embodiment, one partition member 19 is provided for each header 10; however, a plurality of meanders may be provided by providing a plurality of partition members 19 one by one. In addition, the ratio of the tubes 20 through which the refrigerant flows in the same direction can be made different between the upstream side and the downstream side depending on the position of the partition member 19.

  Further, in each of the above embodiments, the inner shape of each flow path 21 of the tube 20 is formed in a square shape, but an elliptical flow path 22 is provided as in the tube 20 shown in FIG. Also good.

  20 and 21 show a third embodiment of the present invention, in which components equivalent to those of the above-described embodiment are denoted by the same reference numerals.

  In the first embodiment, the cutout portions 14 are provided on both the upper end and the lower end of the joining end surfaces of the header member 11, and the header member 11 positioned above the header members 11 joined to each other. Although the connection hole 10a is shown to be formed by the notch 14 of the header member 11 and the notch 14 of the header member 11 positioned below, in the present embodiment, the notch is notched only at the joining end surface of the lower end of the header member 11. The part 14 is provided, and the joining end face at the upper end thereof is formed flat. Other configurations are the same as those of the first embodiment.

  In other words, in the present embodiment, the connection hole 10a is formed by the cutout portion 14 of the header member 11 located above the header members 11 joined together and the joining end face of the upper end of the header member 11 located below. ing. In this case, in this embodiment, an uneven part is provided only on the upper surface of the tube 20, and the lower surface of the tube 20 is formed flat. Moreover, in this embodiment, the notch part 14 is not provided in the lower side cover member 13, and the joining end surface of the upper end is formed flat.

  In the third embodiment, the partition member 19 may be provided to partition the header 10 in the axial direction as in the second embodiment. In this case, similarly to the header member 11 of the third embodiment, the partition member 19 is provided with the cutout portion 14 only on the joint end surface at the lower end.

  In the third embodiment, the notch portion 14 is provided only on the joining end surface at the lower end of the header member. However, the notch portion 14 may be provided only on the joining end surface at the upper end. Good. In this case, each tube 20 is arranged upside down with respect to the third embodiment.

  DESCRIPTION OF SYMBOLS 10 ... Header, 10a ... Connection hole, 11 ... Header member, 12 ... Upper lid member, 13 ... Lower lid member, 14 ... Notch part, 15 ... Convex part, 16 ... Recessed part, 19 ... Partition member, 19a ... Partition Part, 20 ... tube.

Claims (4)

A header for heat medium distribution formed in a cylindrical shape, and a plurality of tubes for heat medium distribution that are spaced apart from each other in the axial direction of the header and connected to the side surfaces of the header. In the heat exchanger provided with a plurality of connection holes to which the end of each tube is connected,
The header is formed by a plurality of divided members joined to each other in the axial direction of the header,
Provide a notch that forms part of the connection hole on at least one of the joining end faces of both ends of each divided member;
A connection hole is formed by the notch between the joining end faces of the divided members joined together ,
Provided on the joint end face of each divided member is an engaging portion that engages with each other so as to restrict movement of the header in the radial direction,
The engagement portion is formed of a convex portion provided on one end surface in the axial direction of the split member and a concave portion provided on the other end surface in the axial direction . The heat exchanger of claim 1, wherein a formed so as to extend the engagement portions in the circumferential direction of the dividing member. The heat exchanger according to claim 1 or 2, wherein a partition portion that partitions the inside of the header in the axial direction is provided on some of the divided members. A header for heat medium distribution formed in a cylindrical shape, and a plurality of tubes for heat medium distribution that are spaced apart from each other in the axial direction of the header and connected to the side surfaces of the header. In the manufacturing method of the heat exchanger provided with a plurality of connection holes to which the ends of each tube are respectively connected,
The header is formed by a plurality of divided members joined to each other in the axial direction of the header,
Provide a notch that forms part of the connection hole on at least one of the joining end faces of both ends of each divided member;
The split member and the tube are alternately stacked so that the end portion of the tube engages with the notch of the split member, and the convex portion provided on one axial end surface of each split member and the other axial end surface are provided. The end of each tube forms a header connected to each connection hole by engaging the recessed portion with each other so as to restrict the movement of the header in the radial direction of the heat exchanger. Production method.

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