WO2001088445A1

WO2001088445A1 - Heat exchanger

Info

Publication number: WO2001088445A1
Application number: PCT/JP2001/001238
Authority: WO
Inventors: Mutsumi Fukushima; Souichi Kato; Muneo Sakurada
Original assignee: Zexel Valeo Climate Control Corporation
Priority date: 2000-05-19
Filing date: 2001-02-21
Publication date: 2001-11-22
Also published as: JP2001330391A

Abstract

A heat exchanger, comprising a tank formed of an inlet passage formed in double layers and an outlet passage disposed parallel with the inlet passage, wherein tubes and fins are stacked alternately and the tank is installed at least at one end of the tubes, the inlet passage and outlet passage are provided in the tank, the inlet passage is divided into an inlet member connection passage and a tube connection passage because a distribution plate is disposed in longitudinal direction, and an expansion valve mounting joint is connected, on the inner side of the heat exchanger, to the inlet member connection passage and outlet passage through an inlet pipe and an outlet pipe, whereby a mounting structure allowing the expansion valve mounting joint to be connected can be provided.

Description

Description heat exchanger

Technical field

The present invention particularly relates to a heat exchanger in which a refrigerant flows and is used as an evaporator. Background art

Conventionally, a heat exchanger as an evaporator that performs a cooling operation is, for example, a pair of parallel heat exchangers as disclosed in Japanese Patent Application Laid-Open No. Hei 9-1599316 and Japanese Patent Application Laid-Open No. Hei 8-52868. It is known that one end of a large number of tubes is inserted into a pair of tanks, and a refrigerant flows into one of the tanks, flows through each tube to the other tank, and from the other tank to the outside. Spilled into the cooling cycle.

In a heat exchanger in which such a pair of tanks and a number of tubes are separated, an inlet pipe through which the refrigerant flows is connected to one tank, and an outlet pipe through which the refrigerant flows is connected to the other tank. There is a difference in the amount of refrigerant flowing into the tube depending on the connection position between the tank and the tank and the connection position between the outlet pipe and the tank. For example, when the inlet / outlet is connected to the center of the tank, the passage length from when the refrigerant enters the evaporator to when it exits becomes shorter near the center, so that the passage resistance becomes smaller near the center. Therefore, the closer the tube is to the center, the more refrigerant flows.

Also, for the same reason, when connected to one end of the entrance / exit tank, the amount of refrigerant flowing into the tube increases nearer the end where the entrance / exit is connected. From the position where the tank is connected to the inlet pipe, The amount of refrigerant flowing changed, which resulted in an uneven temperature distribution in the heat exchanger. For this reason, the applicant arranges a distribution plate in the entrance side passage, and

After dividing into two, openings having different flow resistances are formed in the distribution plate, and the refrigerant is uniformly flown to all portions of the tube connection passage to which the tubes are connected, and the refrigerant is evenly distributed to each tube. Proposed invention.

However, since the inlet-side passage on the tank side of the heat exchanger is divided into two passages, that is, an inlet member connection passage and a tube connection passage, such an inlet having a two-layer (two-stage) structure is formed. A mounting joint for mounting the inflow / outflow pipe and the expansion valve must be installed in the side passage and the outlet side passage parallel to the inlet side passage. There was also a major problem in relation to the vehicle to be mounted and how to place the tank at the optimal position at the top and bottom or at the end from the position where it was pulled out of the air conditioning case.

For this reason, the present invention provides that a heat exchanger having a tank composed of a two-layer inlet passage and an outlet passage provided in parallel with the tank is provided with a mounting structure that enables connection of an expansion valve mounting joint. It is an issue. Disclosure of the invention

A heat exchanger according to the present invention is a heat exchanger in which tubes and fins are alternately laminated, and at least one end of the tube is provided with a tank, wherein the tank is provided with an inlet-side passage and an outlet-side passage. A distribution plate is disposed along the longitudinal direction of the inlet-side passage, and the inlet-side passage is divided into two parts, which are divided into an inlet member connecting passage and a tube connecting passage connected to the inlet member and connected to the tube. The expansion valve mounting joint is connected to the inlet member connecting passage and the outlet side passage via the inlet and outlet pipes on the inner side of the tank. In this way, when the expansion valve fitting is provided inside the tank (between the two tanks of the heat exchanger), it can be mounted via a pair of inlet / outlet pipes. The inlet pipe is connected to an inlet member connection passage via a spacer. As a result, the same structure as the outlet pipe can be used on the tank side.

The inlet pipe and the outlet pipe are bent to the opposite tube side on the opposite tank side, and the expansion valve mounting joint is attached to the inlet / outlet pipe bent to the opposite tube side.

Further, the heat exchanger according to the present invention is a heat exchanger in which tubes and fins are alternately laminated, and at least one end of the tube is provided with a tank, wherein the tank has an inlet-side passage and an outlet-side passage. A distribution plate is disposed along the longitudinal direction of the inlet-side passage, and the inlet-side passage is divided into two parts, which are divided into an inlet member connecting passage and a tube connecting passage connected to the tube and connected to the tube. The expansion valve mounting joint is mounted on the outer surface of the tank on the outer side of the tank, and the inlet mounting hole of the expansion valve mounting joint is provided in the inlet member connection passage, and the outlet mounting hole is similarly provided in the outlet passage. It has been connected. Thus, when the expansion valve mounting joint is provided on the outer side of the tank, it is directly mounted on the outer surface of the tank.

Further, the heat exchanger according to the present invention is a heat exchanger in which tubes and fins are alternately laminated, and at least one end of the tube is provided with a tank, wherein the tank is provided with an inlet passage and an outlet passage. A distribution plate is disposed along the longitudinal direction of the inlet-side passage, and the inlet-side passage is divided into two parts, which are divided into an inlet member connecting passage and a tube connecting passage connected to the tube and connected to the tube. The expansion valve mounting joint is mounted on the tank end face on the tank end face side, and the inlet mounting hole having a hole is connected to the inlet member connection passage, and the outlet mounting hole is also connected to the outlet passage. .

As a result, when the expansion valve mounting joint is provided on the end face side of the tank, Although attached to the contact end face, it is connected to the inlet member connection passage of the inlet side passage through an eccentric hole formed in the inlet side attachment hole, and the outlet side attachment hole is connected to the outlet side passage.

The distribution plate dividing the inlet-side passage is formed by bending an end on the expansion valve mounting joint side to increase the diameter of the eccentric hole. As a result, it is possible to suppress an increase in the resistance of the inflow refrigerant due to an increase in the diameter of the eccentric hole. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a perspective view of a heat exchanger according to the present invention, FIG. 2 is an enlarged cross-sectional view near an inlet pipe and an inlet-side passage of the same, and FIG. 3 is an outlet pipe and an outlet of the same. FIG. 4 is an enlarged cross-sectional view of the vicinity of a side passage, FIG. 4 shows a state in which the same expansion valve mounting joint is attached to an inlet / outlet pipe, (a) is a front view, and (b) is a cross-sectional view; FIG. 5 is a sectional view showing a second embodiment of the present invention, in which an expansion valve mounting joint is connected to a tank. FIG. 6 is a sectional view showing a third embodiment of the present invention. FIG. 7 is a front view showing a state in which the expansion valve mounting joint is connected to the tank. FIG. 7 is a cross-sectional view taken along the line A-A of the above, and FIG. FIG. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In the first embodiment shown in FIGS. 1 to 4, the heat exchanger 1 is, for example, a two-pass heat exchanger, and includes tubes 2 and 2 which are arranged in front and rear in the ventilation direction, and corrugated fins 3. Are alternately laminated, and end plates 4 are arranged at both ends in the laminating direction. Separate upper and lower tanks 5, 6 are brazed so as to communicate with the longitudinal ends of the tubes 2, 2, respectively. I have. The tube 2 is manufactured by roll forming a single plate material, has a flat cross section, and includes a pair of arc portions and a pair of linear portions when viewed in the cross section direction. It has a joint formed by winding.

As shown in FIG. 1, the upper tank 5 (U-turn side) has one detour space inside, and one end of the tube 2 is inserted into a side surface facing the lower tank 6. A large number of inlet holes are formed at equal intervals, and serve to deflect the refrigerant flowing out of one tube 2 and flow it back into the other tube 2. The tank 5 is manufactured by extruding an aluminum alloy material, and has closing plates 30 at both ends in the longitudinal direction of the tank 5.

Further, the lower tank 6 is formed to be longer in the longitudinal direction than the upper tank 5 and to extend to one side, and the inlet-side passage 9 and the outlet-side passage 10 are independently formed therein. In addition, a large number of pairs of insertion holes 11, 11 into which the other ends of the tubes 2, 2 are inserted are formed at equal intervals on a side surface facing the upper tank 5. At both ends in the longitudinal direction, closing plates 14, 14 are inserted through long holes 13 for closing the passages 9, 10. In addition, a portion of the lower tank 6 that extends beyond the upper tank 5 and the side where the pair of inlet holes 11 and 11 are formed has an inlet pipe 17 connected to a refrigeration cycle. And an outlet pipe 18 are inserted, and a pair of holes 26 and 27 connected to the inlet-side passage 9 and the outlet-side passage 10 respectively are formed.

As shown in FIG. 2 in particular, the inlet side passage 9 has a distribution plate 20 disposed therein in the longitudinal direction, and is divided into a tube connection passage 21 and an inlet member connection passage 22 vertically. I have. The end of the tube 2 is connected to the tube connection passage 21 via an insertion hole 11, and the end of the tube 2 is connected to the inlet member connection passage 22. The inlet pipe 17 is connected via the spacer 19.

That is, the connection of the inlet pipe 17 with the inlet member connection passage 22 is described in detail. The inlet end 17 a of the inlet pipe 17 is located inside the large-diameter receiving portion 19 a of the spacer 19. The spacer 19 is inserted into the round hole 26 formed in the inner surface of the tank 6, and the small-diameter insertion portion 19 b at the tip of the spacer is connected to the distribution plate 20. When the spacer 19 is inserted into the hole 25, the spacer 19 is locked by the tank 6 and the distribution plate 20, so that the positioning becomes easy, and the inlet pipe 17 is connected to the inlet member connection passage. 22 will be connected. This inlet pipe 17 extends inside the heat exchanger, ie between tanks 5 and 6.

A large number of communication holes 23 are formed in the distribution plate 20 for distributing the inlet-side passages 9, and the diameter of each communication hole 23 is such that the amount of refrigerant flowing through each of the tubes 2 is substantially constant. Is set arbitrarily. That is, although not shown, the communication hole 23 is closest to the inlet pipe 17, and in this embodiment, the communication hole 23 on the connection hole 25 side of the inlet pipe 17 at the end is The smaller diameter, the farthest communication hole 23 has a large diameter, and the communication hole 23 between them has a medium diameter.

Therefore, the refrigerant flows from the inlet pipe 17, reaches the inlet member connecting passage 22, flows through the inside thereof in the longitudinal direction, and passes through the tube connecting passage 21 through the communication holes 23 of each diameter set arbitrarily. Although the diameter of the communication hole 23 is smaller on the side near the inlet pipe and gradually increases in proportion to the distance from the inlet pipe, the connection position of the inlet pipe 17 may be at the left end on the drawing. Also, the refrigerant is supplied almost uniformly at all portions in the tube connection passage 21. As a result, the amount of refrigerant to each tube 2 becomes substantially equal. Although not shown, when the inlet pipe 17 is located at the center, a small diameter is provided near the center, and a medium diameter and a large diameter are provided as the distance from the inlet pipe 17 increases. Needless to say,

As described above, the outlet-side passage 10 is provided in parallel with the inlet-side passage 9, and the outlet pipe 18 is connected thereto. The connection between the outlet pipe 18 and the outlet side passage 10 is made, as shown in FIG. 3 in particular, by inserting a spacer 24 into a round hole 27 having an insertion end 18a formed on the inner surface of the tank 6. And connected to the outlet passage 10. The outlet pipe 18 extends inward of the heat exchanger, that is, between the tanks 5 and 6, similarly to the inlet pipe 17 described above.

Since not only the outlet pipe 18 but also the inlet pipe 17 is a pipe manufactured by extrusion, no brazing material layers are formed on both outer surfaces. Therefore, brazing is performed by using spacers 19 and 24 having brazing material layers formed on both surfaces. If there is no spacer, an ERW pipe with a brazing material layer on the outer surface may be used, but it has the disadvantage of being expensive, and a method using a brazing material sheet is also conceivable. However, it has the disadvantage that the brazing reliability is low.

The inlet pipe 17 and the outlet pipe 18 are bent in such a direction that the expansion valve mounting side (the end opposite to the tank) is away from the tube (outside of the heat exchanger), and the vicinity of the tip of the bent portion An expansion valve mounting joint 31 for mounting an expansion valve is mounted on the vehicle. As shown in FIG. 4, this expansion valve mounting joint 31 is formed by forming an inlet pipe mounting groove 34 and an outlet pipe mounting hole 35 in an oblong substrate 32, and The mounting hole 35 has a peripheral wall extending cylindrically in both directions from the substrate 32, and the outlet pipe 18 is externally fitted to one of the peripheral walls, and the mounting hole 35 is formed in the inlet pipe mounting groove 34. The inlet pipe 17 is inserted from the opening side, caulked and attached. An engagement protrusion 37 is formed in an annular shape on the inlet pipe 17, and is engaged with a periphery of the inlet pipe mounting groove 34 of the oblong substrate 32. Reference numeral 38 denotes a screw hole. In this way, when the expansion valve fitting 31 is provided on the inlet / outlet pipes 17 and 18 extending inward of the heat exchanger 1, the inlet / outlet pipes 17 and 18 are provided on the anti-cup side (heat exchange side). Since it is bent out of the vessel, it does not hinder the installation of the expansion valve.

The above-mentioned tank 6 is manufactured by extruding and using an aluminum alloy material. In this embodiment, the tank 6 has a partition wall 15 at the center and has the above-described inlet-side passage 9 and outlet-side passage 1 on the left and right. 0 is formed, the two passages are completely separated, and both passages 9, 10 are independent.

Although the tank 6 and the tube 2 are brazed in a furnace, the tank 6 does not have a brazing material layer on the outer surface for extrusion molding. The tube 2 is inserted into the insertion hole 11. The brazing material may be applied to the surface of the tank 6 instead of the brazing material sheet.

The upper tank 5 and the lower tank 6 are sprayed with zinc Zn on the surface thereof or formed with a sacrificial corrosion layer on the outer surface by two-layer extrusion to improve the corrosion resistance.

FIG. 5 shows a second embodiment of the present invention. In this example, the expansion valve mounting joint 3 1 ′ has an inlet and outlet side mounting holes 3 4 ′ and 35 having cylindrical peripheral walls formed in an oblong substrate 32, and one of the outlet side mounting holes. The hole 35 is connected via an outer surface of the tank 6, that is, a hole 40 formed on a surface opposite to the pair of insertion holes 11 and 11, and the other inlet side mounting hole 34 'is also the same. Is connected to the outer surface of the tank 6 through a hole 41 formed. That is, the expansion valve fitting 31 'is provided directly and on the outside.

With this configuration, the refrigerant flows in from the inlet-side mounting hole 34 'through a refrigeration cycle (not shown), passes through the heat exchanger 1, and flows out from the outlet-side mounting hole 35. This is returned to a refrigeration cycle (not shown) through an expansion valve (not shown).

FIGS. 6 to 8 show a third embodiment of the present invention. In this example, the expansion valve mounting joint 3 1 ″ is directly mounted on the longitudinal end face of the tank 6. The expansion valve mounting joint 3 1 ″ has an oblong base plate 32 with an inlet having a cylindrical peripheral wall. And outlet mounting holes 36 and 35 are formed. The outlet mounting hole 35 is connected to the outlet side passage 10 of the opening on the end face of the tank, and the inlet side mounting hole 36 The end face is connected to the entrance member connection passage 22 of the entrance side passage 9 having an opening. The inlet-side mounting hole 36 has an eccentric hole 36a inside, and the eccentric hole 36a is connected to the inlet member connection passage 22. In addition, on the side of the inlet member connection passage 22, the distribution plate 20 is bent, which contributes to an increase in the diameter of the eccentric hole 36 a. And, of course, the one closing plate 14 becomes unnecessary. Industrial applicability

As described above, according to the present invention, the tank on the side communicating with the inlet and outlet pipes is extended in the longitudinal direction, so that the leading end is bent outward from the extended portion. The above-mentioned inlet and outlet pipes extend into the heat exchanger and an expansion valve mounting joint for mounting an expansion valve at the end thereof can be provided, so that the heat exchanger does not interfere with the mounting of the expansion valve. It is easy to install.

On the outer side of the tank, the expansion valve fitting can be directly attached to the outer surface of the tank.

Further, an expansion valve mounting joint can be directly attached to the end face of the tank on the end face side of the tank. In this case, one of the closing plates can be dispensed with. Furthermore, since the hole formed in the inlet side mounting hole is an eccentric hole, the hole communicates with the inlet member connection passage.

In addition, the diameter of the eccentric hole can be increased by bending the distribution plate, and an increase in flow resistance can be suppressed.

Claims

The scope of the claims

1. In a heat exchanger in which tubes and fins are alternately laminated and at least one end of the tube is provided with a tank,

The tank is provided with an inlet-side passage and an outlet-side passage, and a distribution plate is disposed along the longitudinal direction in the inlet-side passage so that the inlet-side passage is divided into two parts. The expansion valve mounting joint is connected to the inlet member connecting passage and the outlet side passage through the inlet and outlet pipes on the inner side of the heat exchanger, respectively. Heat exchanger characterized by having been done. '

2. The heat exchanger according to claim 1, wherein the tank side of the inlet pipe is connected to an inlet member connecting passage via a spacer.

3. The heat exchanger according to claim 1, wherein the expansion pipe mounting side of the inlet pipe and the outlet pipe is bent to the opposite tube side.

4. The heat exchanger according to claim 3, wherein the expansion valve attachment joint is attached to an end of an inlet / outlet pipe bent to the opposite side of the tube.

5. In a heat exchanger in which tubes and fins are alternately laminated and at least one end of the tube is provided with a tank,

The tank is provided with an inlet-side passage and an outlet-side passage, and a distribution plate is disposed along the longitudinal direction in the inlet-side passage so that the inlet-side passage is divided into two parts. The expansion valve mounting joint is mounted on the outer surface of the tank on the outer side of the heat exchanger, and the inlet side mounting hole of the expansion valve mounting joint is connected to the inlet section. A heat exchanger, wherein an outlet-side mounting hole is connected to the outlet-side passage in each of the material connection passages.

6. In a heat exchanger in which tubes and fins are alternately stacked and at least one end of the tube is provided with a tank,

The tank is provided with an inlet-side passage and an outlet-side passage, and a distribution plate is disposed along the longitudinal direction in the inlet-side passage so that the inlet-side passage is divided into two parts. The expansion valve mounting joint is attached to the tank end face on the tank end face side, and an inlet-side mounting hole with a hole is provided in the inlet member connection passage, and also on the outlet side. The heat exchanger, wherein the holes are respectively connected to the outlet side passages.

7. The heat exchanger according to claim 6, wherein the hole formed in the inlet-side mounting hole is an eccentric hole.

8. The heat exchange according to claim 7, wherein the distribution plate has an end on the expansion valve mounting joint side bent toward a tube connection passage to increase the diameter of the eccentric hole. vessel.