JP4952503B2 - Double heat exchanger - Google Patents

Description

The present invention relates to a double heat exchanger having a plurality of heat exchangers.

Patent Document 1 discloses an ejector-type refrigeration cycle. The refrigeration cycle includes a first refrigerant evaporator provided between the ejection side of the ejector and the gas-liquid separator, and a second refrigerant evaporator provided between the gas-liquid separator and the suction side of the ejector. have. As the first refrigerant evaporator and the second refrigerant evaporator, a fin-and-tube type heat exchanger having a plurality of plate fins and a plurality of heat transfer tubes penetrating them is used. The first refrigerant evaporator and the second refrigerant evaporator are arranged close to each other to constitute a dual heat exchanger.
JP-A-6-137695

  In the fin-and-tube heat exchanger, the plate fins and the heat transfer tubes are fixed to each other by a tube expansion process of expanding the diameters of the plurality of heat transfer tubes penetrated by the plurality of plate fins. The tube expansion process includes a table on which a processing target is placed, a plurality of substantially bullet-shaped tube expanders, and a guide jig regularly provided with through holes into which tube expanders are inserted. It is carried out using a tube expansion machine having a pressurizing part that pressurizes and moves to the axial front end side at once.

  In general, when producing a dual heat exchanger as described above, the tubes of each heat exchanger are sequentially expanded one by one. In this case, the number of manufacturing man-hours corresponding to the number of heat exchangers is required for one compound heat exchanger, and thus the problem of increasing the man-hours for manufacturing the compound heat exchanger occurs.

  In order to reduce the manufacturing man-hours for the dual heat exchanger, a dedicated guide jig having a through-hole provided at a position corresponding to the heat transfer tube arrangement position of both heat exchangers is newly created. It is conceivable to expand the pipes at the same time. In this case, since the expansion of a plurality of heat exchangers is performed at the same time, and the integration of the dual heat exchanger is completed simultaneously with the expansion of each heat exchanger, the manufacture of the dual heat exchanger in the pipe expansion process and the assembly process Man-hours are reduced. However, in this case, since it is necessary to newly install a guide jig for each of the multiple heat exchangers having different heat transfer tube arrangements, there arises a problem that the equipment cost increases. Moreover, since it is necessary to replace a guide jig for every duplex heat exchanger, the problem that a setup man-hour increases will arise.

An object of the present invention is to provide a dual heat exchanger that can reduce the number of manufacturing steps while suppressing an increase in facility costs and setup man-hours.

  In order to achieve the above object, the present invention employs the following technical means.

The invention according to claim 1, the first heat exchanger (10), also a first predetermined direction relative to the first heat exchanger (10) a second non-parallel to the first direction A second heat exchanger (20) arranged in parallel in a direction, wherein the first heat exchanger (10) includes a plurality of first plate fins (11), in the second direction together when arranged at a first pitch (p1) in a first direction and arranged at a second pitch (p2), and the first plate fins (11) through respectively substantially parallel to one another A plurality of first heat transfer tubes (12) that extend and allow fluid to flow therein, and the second heat exchanger (20) includes a plurality of second plate fins (21) and a first direction. Are arranged at the first pitch (p1) and at the second pitch (p2) in the second direction, and the second plate fins (21 In the first direction or the second direction, each of which has a plurality of second heat transfer tubes (22) that extend substantially parallel to the first heat transfer tube (12) and circulate a fluid therein. the first heat transfer tubes adjacent to each other and (12) the spacing between the second heat transfer tube (22) (D1, D2) is rot equal to an integral multiple of the first pitch (p1), first The inner diameter (d1) of the heat transfer tube (12) and the inner diameter (d2) of the second heat transfer tube (22) are substantially equal, and both the first and second plate fins (11, 21) are sandwiched in parallel. In addition, a pair of side plates (31, 32) that penetrate through the first and second heat transfer tubes (12, 22) and integrally fix the first and second heat exchangers (10, 20) are further provided. A first heat transfer tube (12) between the first heat transfer tube (12) and the second heat transfer tube (22). The first pitch (p1) distant sites for, is characterized by having a defect portion heat exchanger tube is not provided (33).

As a result, the first and second heat transfer tubes (12, 22) can be provided with general-purpose guide jigs that can be regularly attached with the expander at the first pitch (p1) and the second pitch (p2). Can be expanded using. Therefore, since it is not necessary to produce a guide jig for each duplex heat exchanger, the equipment cost can be reduced. In addition, since it is not necessary to replace the guide jig for each dual heat exchanger, the number of setup steps can be reduced. Furthermore, since the first and second heat transfer tubes (12, 22) can be expanded at the same time, the number of manufacturing steps for the dual heat exchanger can be reduced.
The inner diameter (d1) of the first heat transfer tube (12) and the inner diameter (d2) of the second heat transfer tube (22) are substantially equal. As a result, when expanding pipes with different heat transfer pipe diameters, pipe expansion is performed with separate pipe expanders. However, since the pipe expanders can be shared, the number of setup steps can be further reduced. In addition, it is possible to reduce the equipment cost such as the improvement of the strength of the tube expander when the tube having a different heat transfer tube diameter is expanded with one tube expander. Further, both the first and second plate fins (11, 21) are sandwiched in parallel and penetrated through the first and second heat transfer tubes (12, 22), so that the first and second heat exchangers ( 10 and 20) are further provided with a pair of side plates (31 and 32) for fixing them integrally. Thereby, the first heat exchanger (10) and the second heat exchanger (20) are integrated and fixed by expanding the first and second heat transfer tubes (12, 22). It is possible to further reduce the number of manufacturing steps for the dual heat exchanger. In addition, it is possible to reduce brackets and assembly man-hours when assembling the unit.
In addition, between the first heat transfer tube (12) and the second heat transfer tube (22), the heat transfer tube is located at a position away from the first heat transfer tube (12) by the first pitch (p1). Since there is a defective portion (33) in which no heat is disposed, a dual heat exchanger with a gap that can prevent heat transfer between the first heat exchanger (10) and the second heat exchanger (20) is manufactured. Even in this case, it can be handled without increasing the number of setup man-hours.

  In addition, the code | symbol in the bracket | parenthesis of each said means has shown an example of the corresponding relationship with the specific means as described in embodiment mentioned later.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic diagram showing a schematic configuration of a dual heat exchanger in the present embodiment. The dual heat exchanger of this embodiment is applied to a configuration in which, for example, two refrigerant evaporators in an ejector refrigeration cycle are integrated. As shown in FIG. 1, the dual heat exchanger 1 has two heat exchangers (refrigerant evaporators) 10 and 20 arranged in parallel in the left-right direction in the drawing with a predetermined gap therebetween. The heat exchangers 10 and 20 are both fin and tube types. The heat exchanger 10 includes a pair of side plates 31 and 32 disposed to face each other and a plurality of plate fins 11 sandwiched between the side plates 31 and 32. The plurality of plate fins 11 are arranged in parallel with the side plates 31 and 32. The heat exchanger 10 has a plurality of heat transfer tubes 12 that pass through the side plates 31 and 32 and the plurality of plate fins 11 and allow fluid to flow therethrough. The heat transfer tubes 12 extend substantially parallel to each other, and all have substantially the same inner diameter d1. The heat transfer tubes 12 are regularly arranged at a predetermined row pitch p1 in the row direction (left and right direction in the drawing) parallel to the parallel direction of the heat exchangers 10 and 20. The heat transfer tubes 12 are regularly arranged at a predetermined step pitch p2 in the step direction (vertical direction in the figure) while being shifted by a half pitch in the column direction between adjacent rows.

  The heat exchanger 20 shares the side plates 31 and 32 with the heat exchanger 10 and has a plurality of plate fins 21 sandwiched in parallel with the plate fins 11 between the side plates 31 and 32. The plurality of plate fins 21 are arranged in parallel with the side plates 31 and 32 in the same manner as the plate fins 11. The heat exchanger 20 has a plurality of heat transfer tubes 22 that pass through the side plates 31 and 32 and the plurality of plate fins 21 and allow fluid to flow therethrough. Each heat transfer tube 22 extends substantially parallel to the heat transfer tube 12, and all have an inner diameter d2 substantially equal to the inner diameter d1 of the heat transfer tube 12 (d1≈d2). The heat transfer tubes 22 are regularly arranged at a row pitch p1 in the row direction, similarly to the heat transfer tubes 12. Similarly to the heat transfer tubes 12, the heat transfer tubes 22 are regularly arranged at a step pitch p2 in the step direction while being shifted by a half pitch in the column direction between adjacent rows.

  Here, the heat transfer tubes 12 and 22 are not only regularly arranged in the respective heat exchangers 10 and 20 but also regularly arranged based on a common arrangement rule in the entire duplex heat exchanger 1. ing. Therefore, the heat transfer tubes 12 and 22 of the duplex heat exchanger 1 correspond to the gaps between the heat exchangers 10 and 20 and the outer peripheral ends of the heat exchangers 10 and 20 according to the arrangement rule. , 22 are arranged at a common column pitch p1 in the column direction, and at a common column pitch p2 in the column direction, except for a portion where no 22 is disposed (hereinafter referred to as “defect portion” in the present specification). Yes.

  In the present embodiment, in the arrangement of the heat transfer tubes 12 and 22, one defective portion 33 corresponding to the gap between the heat exchangers 10 and 20 is formed in an odd number row including the first row at the upper end in the drawing. Therefore, in the odd-numbered rows in the arrangement of the heat transfer tubes 12 and 22, the interval D1 between the heat transfer tubes 12 and 22 adjacent to each other in the row direction is twice the row pitch p1 (D1 = p1 × 2). On the other hand, the defect part 33 is not formed in the even number column including the second column. Therefore, in the even-numbered column, the interval D2 between the heat transfer tubes 12 and 22 adjacent to each other in the column direction is equal to the column pitch p1 (D2 = p1).

  Here, the number of defective portions 33 between the heat transfer tubes 12 and 22 is not limited to zero or one, and two or more defective portions 33 may be arranged in the column direction. That is, the distances D1 and D2 between the heat transfer tubes 12 and 22 are an integral multiple (one or more times) of the row pitch p1.

  Next, the manufacturing method of the dual heat exchanger of this embodiment is demonstrated. First, a plurality of plate fins 11 each having a through hole formed at the arrangement position of the heat transfer tube 12 shown in FIG. 1, and a plurality of plates each having a through hole formed at the arrangement position of the heat transfer tube 22 shown in FIG. The fin 21 is produced. Moreover, a pair of side plates 31 and 32 in which through holes are formed at the arrangement positions of the heat transfer tubes 12 and 22 shown in FIG.

  Next, with respect to the through holes of the pair of side plates 31 and 32 and the plurality of plate fins 11, a plurality of heat transfer tubes 12 having an outer diameter substantially equal to or smaller than the inner diameter of the through holes are extended in parallel to each other. Each penetrates. Thereby, the assembly body of the heat exchanger 10 is produced. At this time, the heat transfer tubes 12 are regularly arranged at a row pitch p1 in the row direction and regularly at a step pitch p2 in the row direction. In this state, the space between the heat transfer tube 12 and the side plates 31 and 32 and the plate fin 11 is not fixed.

  Further, a plurality of heat transfer tubes 22 having outer diameters substantially equal to or smaller than the inner diameters of the through holes of the side plates 31 and 32 and the plurality of plate fins 21 extend in parallel to the heat transfer tubes 12. Each penetrates. Thus, an assembly of the heat exchanger 20 is manufactured, and an assembly of the dual heat exchanger 1 in which the heat exchangers 10 and 20 are arranged in parallel in the column direction is manufactured. At this time, the heat transfer tubes 22 are regularly arranged at the row pitch p1 in the row direction and regularly at the step pitch p2 in the row direction. Further, the distances D1 and D2 between the heat transfer tubes 12 and 22 adjacent to each other in the column direction are integral multiples of the column pitch p1. In this state, the space between the heat transfer tube 22 and the side plates 31 and 32 and the plate fin 21 is not fixed.

  Next, each of the heat transfer tubes 12 and 22 is expanded to fix the heat transfer tube 12 between the side plates 31 and 32 and the plate fin 11 and between the heat transfer tube 22 and the side plates 31 and 32 and the plate fin 21. A pipe expansion process is performed.

  FIG. 2 schematically shows a schematic configuration of a pipe expander used in a pipe expansion process in the method for manufacturing a dual heat exchanger of the present embodiment. As shown in FIG. 2, the pipe expander 50 has a table 51 on which an assembly of the dual heat exchanger 1 to be processed is placed. The upper surface of the table 51 is substantially horizontal. The tube expander 50 includes a plurality of tube expanders 52 that are detachably attached so that their respective axial directions are substantially horizontal and parallel to each other, and a pressurizing unit that simultaneously pressurizes and moves the respective tube expanders 52 toward the distal end side in the axial direction. Part 53. In FIG. 2, the pressurizing movement direction of the tube expander 52 is indicated by a white thick arrow.

  The pressurizing unit 53 includes a pressurizing plate 55 for pressurizing and moving the plurality of tube expanders 52 all at once, and a plurality of guide plates 56 and 57 for guiding the tube expander 52 to move toward the distal end side in the axial direction. And have. The pressure plate 55 and the guide plates 56 and 57 are arranged in parallel with each other and are substantially perpendicular to the direction of pressure movement. The pressure plate 55 is configured such that the rear end side of each expansion tube 52 comes into contact with or is fixed. The guide plate 56 provided on the most processing target side is fixed to the table 51, and the other guide plates 56 move in the pressurizing movement direction with the pressurizing movement of the pressurizing plate 55. Yes.

  FIG. 3 schematically shows a configuration in the vicinity of the distal end portion of the tube expander 52. As shown in FIG. 3, the tube expander 52 has a rod-like shape. The distal end portion of the tube expander 52 has a substantially bullet-like (or substantially spherical) shape, and has a diameter d3 larger than the inner diameter d4 of the heat transfer tube 12 (or heat transfer tube 22) before the tube expansion.

  FIG. 4 schematically shows the configuration of the guide plate 57. As shown in FIG. 4, the guide plate 57 is formed with a plurality of through holes 58 into which the tube expanders 52 are slidably inserted. FIG. 4 shows only a part of the through holes 58. The through holes 58 are regularly arranged at a row pitch p1 in the row direction, and are regularly arranged at a step pitch p2 in the row direction while being shifted by a half pitch between adjacent rows. As will be described later, the guide plate 57 of the present embodiment is a general-purpose type that can be used in various pipe heat exchangers having different arrangement patterns of the heat transfer tubes 12 and 22 and a single heat exchanger. . The guide plate 56 has the same configuration as the guide plate 57.

  In the tube expansion process, first, the assembly of the duplex heat exchanger 1 is placed on the table 51 so that the axial direction of the heat transfer tubes 12 and 22 is parallel to the pressurizing movement direction. The placed duplex heat exchanger 1 is fixed in the front and rear, left and right, and up and down directions using a fixing jig.

  Next, a plurality of tube expansion elements 52 having a tip portion having an outer diameter larger than the inner diameter of the heat transfer tubes 12 and 22 before the tube expansion and having a length longer than at least the distance between the side plates 31 and 32 are replaced with the heat transfer tube 12. , 22 is selectively inserted into the through hole 58 at a position corresponding to the arrangement position of 22 from the rear end side, and the rear end of the tube expander 52 is brought into contact with the surface of the pressure plate 55.

  Next, the pressurizing plate 55 is moved in the pressurizing movement direction, and the respective tube expanders 52 are pressed and moved all at once in the axial direction front end side. Thereby, the front-end | tip of each expansion tube 52 is press-fit in the heat exchanger tubes 12 and 22, and the heat exchanger tubes 12 and 22 are each gradually expanded. The pressurizing movement of the pressure plate 55 is performed until the expansion of the entire heat transfer tubes 12 and 22 in the axial direction is completed. Thereby, all the heat transfer tubes 12 and 22 of the duplex heat exchanger 1 are expanded almost simultaneously, and the heat transfer tube 12 and the side plates 31 and 32 and the plate fin 11 are fixed to each other, and the heat transfer tube 22 and the side plate 31 and 32 and the plate fin 21 are fixed to each other. Through the above steps, the dual heat exchanger 1 of the present embodiment is manufactured.

  In general, when processing a plurality of types of heat exchangers using a single pipe expansion machine 50, before processing, (1) a guide plate suitable for the heat exchanger to be processed is set in the pipe expansion machine 50, and (2 Three setups are mainly required: a) an expansion tube suitable for the heat exchanger is set on the guide plate, and (3) the heat exchanger is fixed on the table.

  In this embodiment, since the general-purpose guide plate 57 is used, the setup (1) is not necessary. In addition, since it is not necessary to replace the guide plate 57, it is not necessary to attach or detach all the expanders, and it is only necessary to attach or detach some of the expanders as necessary, so that the setup in (2) is simplified. Furthermore, since the heat transfer tube 12 and the heat transfer tube 22 can be expanded at the same time, the number of times of setup in (3) is reduced as compared with the case where the heat exchangers 10 and 20 are sequentially expanded. Thus, according to the present embodiment, the number of man-hours for setup in the pipe expansion process can be greatly reduced.

  Here, the setup (2) will be specifically described. FIG. 5 is a diagram illustrating an example of a plurality of types of heat exchangers that are sequentially expanded using a single expansion machine 50. FIG. 5A shows a configuration in which the dual heat exchanger 2 in which the heat exchanger 10 and the heat exchanger 20 are integrated is viewed from the side plate 32 side. FIG. 5B shows a configuration in which the single heat exchanger 3 to be expanded after the expansion of the double heat exchanger 2 is viewed from the side plate 32 side. In the example shown in FIGS. 5A and 5B, a hairpin tube in which adjacent heat transfer tubes 12, 22, 42 are connected in a U shape outside the side plate 32 is used. As shown in FIG. 5 (a), in the dual heat exchanger 2, the heat transfer tubes 12, 22 and the defective portions 33 are regularly arranged in the row direction at the row pitch p1, and regularly in the step direction at the step pitch p2. Arranged. Further, as shown in FIG. 5B, the heat transfer tubes 42 of the single heat exchanger 3 are regularly arranged in the column direction and the column direction at the column pitch p1 and the column pitch p2 similar to the above.

  In the tube expansion process of the duplex heat exchanger 2, the tube expander 52 is selectively inserted into the through hole 58 of the guide plate 57 at a position corresponding to the arrangement position of the heat transfer tubes 12 and 22, and the position corresponding to the defective portion 33. The expander 52 is not inserted into the tube.

  In the setup for expanding the single heat exchanger 3, which is performed after the expansion of the double heat exchanger 2, the tube 52 is inserted into the three through holes 58 at positions corresponding to the defective portions 33 of the double heat exchanger 2. Is inserted. Further, the tube expanders 52 inserted in the three through holes 58 corresponding to the arrangement positions of the three heat transfer tubes 22 at the left end (A portion) in FIG. With the above simple procedure, the setup in (2) is completed. Here, the dual heat exchanger 2 and the single heat exchanger 3 are taken as an example, but the setup of (2) is similarly simplified even when the pipe expansion of a plurality of types of dual heat exchangers is performed sequentially. .

  Moreover, in this embodiment, since it is not necessary to produce a guide plate for every heat exchanger, equipment cost can be reduced. Furthermore, since the heat transfer tube 12 and the heat transfer tube 22 can be expanded at the same time, the number of manufacturing steps in the expansion process of the dual heat exchanger can be reduced.

  In this embodiment, since the inner diameter d1 of the heat transfer tube 12 and the inner diameter d2 of the heat transfer tube 22 are equal, the tube expander 52 can be shared. Therefore, the setup (2) can be further simplified and the number of setup steps can be further reduced.

  Furthermore, in this embodiment, the side plates 31 and 32 are shared by the heat exchangers 10 and 20. Thereby, the heat exchangers 10 and 20 are integrated and fixed to each other at the same time as the heat transfer tubes 12 and 22 and the side plates 31 and 32 are fixed by expansion. Therefore, since the assembly process of assembling and integrating the heat exchangers 10 and 20 after the tube expansion process can be omitted, the number of manufacturing steps of the dual heat exchanger can be reduced. Moreover, since components such as a bracket for integrating the heat exchangers 10 and 20 are not necessary, the configuration of the dual heat exchanger is simplified.

(Other embodiments)
In the above embodiment, the example in which the inner diameter d1 of the heat transfer tube 12 and the inner diameter d2 of the heat transfer tube 22 are equal is given, but the outer diameter of the expansion tube 52 at a position corresponding to the arrangement position of the heat transfer tube 12 and the heat transfer tube 22 The inner diameter d1 and the inner diameter d2 may be made different by making the outer diameter of the tube expander 52 at a position corresponding to the arrangement position different.

  Moreover, in the said embodiment, although the manufacturing method of the double heat exchanger using the horizontal type pipe expander 50 with which the axial direction of the pipe expander 52 becomes horizontal was mentioned as an example, the vertical type with which the axial direction of a pipe expander becomes a vertical direction. It is also possible to use a tube expander.

  Furthermore, in the said embodiment, although the two heat exchangers 10 and 20 are arrange | positioned in parallel in the column direction, you may arrange in parallel in the step direction.

  Moreover, in the said embodiment, although the duplex heat exchanger 1 provided with the two heat exchangers 10 and 20 was mentioned as an example, the duplex heat exchanger may be provided with the 3 or more heat exchanger.

It is a schematic diagram which shows schematic structure of the double heat exchanger in 1st Embodiment. It is a figure which shows typically the schematic structure of the pipe expander used for the pipe expansion process in the manufacturing method of the duplex heat exchanger of 1st Embodiment. It is a figure which shows typically the structure of the front-end | tip part vicinity of an expansion tube. It is a figure which shows the structure of a guide plate typically. It is a figure which shows the example of the multiple types of heat exchanger expanded sequentially using one tube expander.

Explanation of symbols

1, 2, double heat exchanger 3 heat exchanger 10, 20 heat exchanger 11, 21 plate fins 12, 22, 42 heat transfer tubes 31, 32 side plate 33 defective portion 50 tube expander 51 table 52 tube expander 53 pressure unit 55 Pressure plate 56, 57 Guide plate 58 Through hole

Claims (1)

A first heat exchanger (10) and a second heat exchanger arranged in parallel in a predetermined first direction or a second direction not parallel to the first direction with respect to the first heat exchanger (10). A heat exchanger (20) with a dual heat exchanger,
The first heat exchanger (10) is arranged with a plurality of first plate fins (11) and a first pitch (p1) in the first direction and a second in the second direction. A plurality of first heat transfer tubes (12) arranged at a pitch (p2), extending through each of the first plate fins (11) and extending substantially parallel to each other, and allowing fluid to flow therethrough;
The second heat exchanger (20) is arranged with a plurality of second plate fins (21) and the first pitch (p1) in the first direction and the second heat exchanger (20) in the second direction. A plurality of second plates that are arranged at a pitch (p2) of 2 and extend substantially parallel to the first heat transfer tube (12) through the second plate fins (21), respectively. A heat transfer tube (22),
The distance (D1, D2) between the first heat transfer tube (12) and the second heat transfer tube (22) adjacent to each other in the first direction or the second direction is the first direction. rot equal to the integer multiple of the pitch (p1),
The inner diameter (d1) of the first heat transfer tube (12) and the inner diameter (d2) of the second heat transfer tube (22) are substantially equal,
The first and second heat exchangers sandwich both the first and second plate fins (11, 21) in parallel and pass through the first and second heat transfer tubes (12, 22). It further has a pair of side plates (31, 32) for fixing (10, 20) integrally,
Between the first heat transfer tube (12) and the second heat transfer tube (22), the first heat transfer tube (12) is separated from the first pitch (p1). It has a defective part (33) where a heat pipe is not arranged, The double type heat exchanger characterized by the above-mentioned.

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