JP7117839B2 - Heat exchanger headers and heat exchangers - Google Patents

Description

The present invention relates to heat exchanger headers and heat exchangers.

As a heat exchanger used in air conditioners, refrigerators, etc., there is known a fin-tube heat exchanger that exchanges heat by circulating a heat medium through a heat transfer tube to which flat plate-shaped heat radiating fins are attached. A finned-tube heat exchanger includes a header that distributes and distributes a heat medium to a plurality of heat transfer tubes. Further, some headers are provided with a bypass channel for suppressing pressure loss in the main channel of the heat medium formed in the header and improving the oil return performance of the refrigerating machine oil.

A header having a bypass flow path is large in size because it forms independent main flow paths and bypass flow paths. In order to prevent an increase in size, a downsized header has been developed by integrally configuring a main flow path and a bypass flow path (for example, Patent Document 1).

JP-A-2004-239592

In the header of Patent Document 1, the tip of the main pipe forming the main flow path is combined with the stepped portion at the tip of the auxiliary pipe forming the bypass flow path. That is, the tips of the auxiliary pipe and the main pipe are combined and joined together. Therefore, in the header of Patent Document 1, if there is an unevenness at the tip to be joined, the joinability between the auxiliary pipe and the main pipe may deteriorate, and the heat medium in the header may leak to the outside.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a heat exchanger header and a heat exchanger that are small in size, highly airtight, and have a plurality of flow paths.

In order to achieve the above object, a heat exchanger header according to the present invention has a first flow path for circulating a heat medium and a first U-shaped portion formed to have a U-shaped cross section. a first header member in which the inner surface of the first U-shaped portion constitutes a part of the inner surface of the second flow path through which the heat medium flows; a second header member having a glyph-shaped portion and being combined with the first header member to form a second flow path. The first header member is a joint portion that is joined to the second header member at each tip of the first U-shaped portion, and is a curved portion of the U-shaped cross-sectional view of the first U-shaped portion. It has a junction composed of a tip portion and a straight portion extending from the tip portion. Also, the second header member is provided on the inner surface of the second U-shaped portion at a position apart from each tip of the second U-shaped portion, and the inner surface of the second U-shaped portion is located on the outer surface. joint recesses recessed to the side, wherein the straight portions of the joint are inserted and the inner surfaces of the joint recesses are soldered to the outer surfaces of the straight portions of the joint ; and a projecting portion, which is a portion of the second U-shaped portion which is crimped to the member and which covers the outer surface of the first header member, and which is a portion distal to the joining recess.

According to the present invention, the joint portion of the first header member forming the first flow path is fitted into the joint concave portion of the second header member forming the second flow path and crimped. , the outer shape of the header member having a plurality of flow paths can be reduced. In addition, since the second header member has a projecting portion that covers the outer surface of the first header member, sufficient brazing material is supplied to the joint portion between the first header member and the second header member to provide an airtight joint. It is possible to improve

1 is a front view of a heat exchanger according to Embodiment 1 of the present invention; 1 is a perspective view of a heat transfer tube according to Embodiment 1 1 is an exploded perspective view of a header and a joint pipe according to Embodiment 1. FIG. Cross-sectional front view of the header according to the first embodiment (A) is a cross-sectional top view of the header before combination according to the first embodiment, (B) is a cross-sectional top view of the header after combination according to the first embodiment, and (C) is after crimping according to the first embodiment. header cross section top view FIG. 4 is a cross-sectional top view of a header according to Embodiment 2 of the present invention; FIG. 11 is a cross-sectional top view showing the first header member and the second header member before joining according to the second embodiment; FIG. 10 is a cross-sectional top view of the header according to the second embodiment with the projecting portion crimped; FIG. 3 is a cross-sectional top view of a header according to Embodiment 3 of the present invention; FIG. 5 is a cross-sectional top view of a header according to Embodiment 4 of the present invention;

Hereinafter, a heat exchanger header and a heat exchanger according to embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
The heat exchanger 1 according to the present embodiment exchanges heat between the air flowing outside the heat exchanger 1 and the heat medium flowing inside the heat exchanger 1 . As shown in FIG. 1 , the heat exchanger 1 includes heat transfer tubes 21 through which a heat medium flows, headers 10 connected to the heat transfer tubes 21 and allowing the heat medium to flow into the heat transfer tubes 21 , and The header 11 is formed to allow the heat medium to flow out from the heat transfer tubes 21 , and the heat dissipation fins 31 attached to the heat transfer tubes 21 .

As shown in FIG. 2, the heat transfer tube 21 is a piping member having a flat cross-section consisting of a short side of an arc and a long side of a flat portion, and allows a heat medium to flow through a flow hole 21a formed therein. By forming the heat transfer tube 21 to have a flattened cross-section, the ventilation resistance around the heat transfer tube 21 can be reduced and the heat exchange efficiency can be improved.

The heat transfer tube 21 is formed by extrusion, drawing, or the like. The heat transfer tube 21 is made of an aluminum alloy with a sacrificial anode layer formed by thermally spraying zinc on the outer surface thereof. Thereby, leakage of the heat medium due to corrosion of the heat transfer tubes 21 can be prevented.

One end of the heat transfer tube 21 is inserted into a mounting hole 105a formed in the header 10 and welded and fixed to the header 10 by brazing, as shown in FIG. The other end of the heat transfer tube 21 is inserted into a mounting hole 115a formed in the header 11 and welded and fixed by brazing.

The radiating fins 31 are plate-shaped members for increasing the cooling efficiency by increasing the contact area with the air, and as shown in FIG. The material of the radiation fins 31 is, for example, a clad material in which a brazing material is rolled and joined to the surface of an aluminum plate, and has a thickness of about 0.09 to 0.2 mm.

As shown in FIG. 1, the radiation fins 31 have a plurality of through holes through which the heat transfer tubes 21 are inserted. The through-hole is a flat-shaped hole through which the flat-shaped heat transfer tube 21 can be inserted. A heat transfer tube 21 is inserted through each through hole. Then, by brazing the connecting portion between the inserted heat transfer tube 21 and the heat transfer fin 31, the heat transfer fin 31 and the heat transfer tube 21 are connected.

As shown in FIG. 1, a plurality of radiating fins 31 are attached in the longitudinal direction of the heat transfer tube 21, that is, in the direction in which the heat medium flows.

The headers 10 and 11 are a pair of piping members for supplying and discharging the heat medium, which is a fluid, to the heat exchanger 1 . A plurality of mounting holes 105a and 115a are formed in the headers 10 and 11, respectively. Then, the heat transfer tubes 21 are inserted into the respective mounting holes 105 a and connected to the header 10 .

The header 10 comprises a first header member 101, a second header member 105 and a cap 108, as shown in FIGS.

As shown in FIGS. 3 and 4, the first header member 101 has a bypass flow path Bf that is a first flow path, and is combined with a second header member 105 to form a second flow path. It is a member that constitutes the main flow path Mf. The bypass channel Bf is a through hole formed in the first header member 101 .

In addition, the first header member 101 includes a U-shaped portion forming part of the inner surface of the main flow path Mf in parallel with the bypass flow path Bf. The U-shaped portion is formed over the entire longitudinal direction of the first header member 101 . Also, the tip of the U-shaped portion is a joint portion 101 d that is joined to the second header member 105 .

The first header member 101 is molded by extrusion, drawing, or the like. The first header member 101 is made of an aluminum alloy with a sacrificial anode layer formed by spraying zinc on the outer surface. Thereby, leakage of the heat medium due to corrosion of the header 10 can be prevented.

3, the first header member 101 includes a joint pipe connection portion 101a connected to a joint pipe 23, which will be described later. The joint pipe connecting portion 101 a is a portion obtained by cutting out a part of the intermediate portion of the bypass flow path Bf, and the length of the cutout is equal to the outer diameter of the joint pipe 23 . In addition, as shown in FIG. 4, the first header member 101 includes a joint pipe insertion hole 101b that communicates the inside of the main flow path Mf with the outside of the bypass flow path Bf.

The first header member 101 also includes a bypass hole 101c that communicates the main flow path Mf and the bypass flow path Bf. A bypass circuit is formed by this bypass hole 101c and the joint pipe insertion hole 101b described above, thereby suppressing pressure loss in the header 10 and improving the oil return performance of the refrigerating machine oil used in the compressor. The position of the bypass hole 101c is desirably positioned on the lower side of the heat exchanger 1 in the gravitational direction as much as possible.

The second header member 105 is an elongated member having a U-shaped cross section which is combined with the first header member 101 to form the main flow path Mf of the header 10, as shown in FIGS. The material of the second header member 105 is a clad material obtained by roll-bonding a brazing material to an aluminum plate, and is formed by pressing.

The second header member 105 has attachment holes 105a for attaching the heat transfer tubes 21, as described above. The shape of the attachment hole 105 a is a flat shape that matches the outer shape of the heat transfer tube 21 .

The second header member 105 has a joint recess 105b as shown in FIG. 5(A). The joining recess 105b is a recess formed by press working on the inner surface of the second header member 105 having a U-shaped cross section, and is formed along the entire longitudinal direction of the second header member 105. As shown in FIG. The joint recesses 105 b are formed at two locations on the inner surface of the second header member 105 . The joint portion 101d of the first header member 101 fits into the joint concave portion 105b when the first header member 101 and the second header member 105 are combined.

The shape of the joint recess 105b is not particularly limited, but in the present embodiment, the distance between the inner surfaces of the two joint recesses 105b is set larger than the outer dimension of the joint 101d of the first header member 101. . Also, the size of the joint recess 105b is such that the joint 101d can enter. As a result, the joint portion 101d of the first header member 101 expands the second header member 105, thereby preventing the external dimensions of the second header member 105 from increasing.

Also, the second header member 105 has a projecting portion 105c. The protruding portions 105c are both side end portions of the second header member 105 having a U-shaped cross section, and are the tip portion from the joint recessed portion 105b. As shown in FIG. 5B, the protruding portion 105c is formed between the first header member 101 and the second header member 105 when the first header member 101 and the second header member 105 are combined. It protrudes to the joint portion and the outer surface of the first header member 101 . Moreover, after the first header member 101 and the second header member 105 are combined, the projecting portion 105c is crimped to cover the outer surface of the first header member 101 .

As shown in FIG. 4, after joining the first header member 101 and the second header member 105, the caps 108 are attached to the longitudinal ends of the main flow path Mf and the bypass flow path Bf. The bypass channel Bf is blocked. The cap 108 is made of a clad material obtained by roll-bonding a brazing material to the surface of an aluminum plate, and is formed by press working.

The joint pipe 23 is a piping member that allows the heat medium to flow into the header 10 . As shown in FIGS. 3 and 4, a through hole 23b is formed in the vicinity of the connecting portion 23a of the joint pipe 23 connected to the header 10. As shown in FIGS. The joint pipe 23 is inserted into the joint pipe insertion hole 101b of the first header member 101 and communicated with the main flow path Mf. The through-hole 23b is a hole penetrating the joint pipe 23 in the diameter direction of the circular cross section, and communicates the main flow path Mf and the bypass flow path Bf via the joint pipe 23 .

As shown in FIG. 1 , the header 11 is connected to the end of the heat transfer tube 21 opposite to the side connected to the header 10 . The basic configuration of the header 11 is similar to that of the header 10, and includes a first header member 111, a second header member 115, and a cap .

The header 11 is connected to an outflow pipe (not shown), collects the heat medium that has flowed into the heat transfer tubes 21 from the header 10, and causes it to flow out to the outflow pipe.

The heat exchanger 1 is configured as described above, and heat-exchanges the heat medium flowing in from the joint pipes 23 connected to the header 10 with the heat transfer pipes 21 . The heat exchanger 1 also causes the heat medium after heat exchange to flow out from an outflow pipe (not shown) connected to the header 11 .

Next, a detailed procedure for joining the first header member 101 and the second header member 105 will be described.

A plurality of heat transfer tubes 21 to which radiation fins 31 are fixed are inserted into mounting holes 105 a of second header member 105 .

Next, the first header member 101 is attached to the second header member 105 . Specifically, as shown in FIG. 5B, the joint portion 101d of the first header member 101 is fitted into the joint concave portion 105b of the second header member 105. As shown in FIG. As described above, the joint recess 105b is formed to have a size that allows the joint portion 101d of the first header member 101 to enter. Therefore, the first header member 101 and the second header member 105 overlap each other at the junction between the first header member 101 and the second header member 105, and the external dimensions of the second header member 105 increase. can be prevented, and the size of the header 10 can be reduced.

Subsequently, as shown in FIG. 5C, the protrusion 105c of the second header member 105 is crimped to fix the first header member 101 to the second header member 105. Then, as shown in FIG. As a result, the gap between the second header member 105 and the first header member 101 can be reduced, and the adhesion can be improved.

Subsequently, the joints between the first header member 101 and the second header member 105 and the joints between the second header member 105 and the heat transfer tubes 21 are heated and brazed in a heating furnace. As described above, the material of the second header member 105 is clad material clad with a brazing material layer, so sufficient brazing material is supplied from the brazing material layer of the projecting portion 105c of the second header member 105 to the joint portion. be done. Therefore, the first header member 101 and the second header member 105 can be joined with high airtightness.

As described above, the second header member 105 of the heat exchanger 1 according to the present embodiment includes the joint recess 105b at the joint portion with the first header member 101, so that the first header member 101 The header 10 can be miniaturized by avoiding a thick structure due to overlapping of the second header member 105 and the second header member 105 . Further, by crimping and fixing the joint portion between the first header member 101 and the second header member 105, the adhesion between the first header member 101 and the second header member 105 is improved, and the brazing reliability is improved. can be improved. Thereby, leakage of the heat medium from the header 10 can be prevented.

Although the second header member 105 according to the present embodiment uses a clad material clad with a brazing material layer, the present invention is not limited to this. For example, instead of using clad material for the second header member 105, the first header member 101 and the second header member 105 may be joined using solder paste, wire solder, or the like. In this case, the supplied paste brazing, wire brazing or the like is held between the outer surface of the first header member 101 and the inner surface of the second header member 105 by the projecting portion 105c of the second header member 105. Therefore, high brazing reliability can be secured.

(Embodiment 2)
Next, a heat exchanger 1 according to Embodiment 2 of the present invention will be described. As shown in FIG. 6, the heat exchanger 1 according to the present embodiment differs from the first embodiment in that the joint recess 106b of the second header member 106 has a stepped shape. Since other configurations are the same as those of the first embodiment, they are denoted by the same reference numerals.

As shown in FIG. 6, the second header member 106 according to the present embodiment includes a stepped joint recess 106b. Specifically, the joint concave portion 106b is a thin portion having a small plate thickness from the joint portion on the inner surface of the second header member 106 to the projecting portion 106c, that is, the open side end portion.

Next, a detailed procedure for joining the first header member 101 and the second header member 106 according to this embodiment will be described.

When joining the first header member 101 and the second header member 106 , the joining portion 101 d of the first header member 101 is inserted inside the projecting portion 106 c of the second header member 106 . As shown in FIG. 6, the first header member 101 is attached to the second header member 106 until the joint portion 101d of the first header member 101 contacts the stepped wall portion 106d of the second header member 106. Insert inside.

In the header 10 according to the present embodiment, as shown in FIG. 7, the inner width W1 of the joint portion of the second header member 106 is larger than the outer width W2 of the joint portion 101d of the first header member 101. set small. As a result, when the joint portion 101d of the first header member 101 is brought into contact with the stepped wall portion 106d of the second header member 106, the joint portion of the second header member 106 is brought into contact with the first header member 101. Since the joint portion 101d is sandwiched, the adhesion between the first header member 101 and the second header member 106 is enhanced, and good brazing reliability can be ensured.

After inserting the first header member 101 into the second header member 106, the joint portion between the first header member 101 and the second header member 106 and the joint portion between the second header member 106 and the heat transfer tube 21 are heated in a heating furnace for brazing.

As described above, in the heat exchanger 1 according to the present embodiment, since the joint portion of the second header member 106 has a stepped structure, the first header member 101 and the second header member 106 A thick structure due to overlapping can be avoided, and the size of the header 10 can be reduced. Moreover, since the first header member 101 is sandwiched between the second header members 106 and joined, the reliability of brazing can be improved. Thereby, leakage of the heat medium from the header 10 can be prevented.

Further, in this embodiment, as shown in FIG. 8, after inserting the first header member 101 to a position where it abuts against the stepped wall portion 106d of the second header member 106, the projecting portion 106c is crimped. , the outer surface of the first header member 101 is enclosed and fixed. As a result, the gap between the first header member 101 and the second header member 106 during brazing can be made smaller and the adhesion can be improved, so that the reliability of brazing can be improved.

(Embodiment 3)
Next, a heat exchanger 1 according to Embodiment 3 of the present invention will be described. As shown in FIG. 9, the heat exchanger 1 according to the present embodiment is different from the first embodiment in that the first header member 102 includes positioning ribs 102e that regulate the amount of insertion of the heat transfer tubes 21. . Since other configurations are the same as those of the first embodiment, they are denoted by the same reference numerals.

As shown in FIG. 9, the first header member 102 according to the present embodiment has positioning ribs 102e on the inner surface forming part of the main flow path Mf. The positioning rib 102 e protrudes from the inner surface of the first header member 102 toward the attachment hole 105 a of the second header member 105 . The positioning rib 102e is formed in the longitudinal direction of the first header member 102, and is formed by extrusion or drawing along with the external shape, the bypass channel Bf, and the like.

Next, a detailed procedure for joining the first header member 102 and the second header member 105 according to this embodiment will be described.

In this embodiment, as in the first embodiment, the joining portion 102d of the first header member 102 is fitted into the joining concave portion 105b of the second header member 105 and joined. When the amount of insertion of the heat transfer tubes 21 inserted into the mounting holes 105a of the second header member 105 is large, the longitudinal ends of the heat transfer tubes 21 come into contact with the positioning ribs 102e.

Since the heat transfer tubes 21 and the second header member 105 are not fixed by brazing, the heat transfer tubes 21 in contact with the positioning ribs 102e are pressed in the direction of being pulled out of the second header member 105 . As a result, it is possible to adjust the amount of insertion of the heat transfer tubes 21 into the second header member 105, so that it is possible to prevent the cross-sectional area of the main flow path Mf from decreasing due to excessive insertion of the heat transfer tubes 21 into the header 10. .

After combining the first header member 102 and the second header member 105, the projecting portion 105c of the second header member 105 is crimped. Thereafter, the joints between the first header member 102 and the second header member 105 and the joints between the second header member 105 and the heat transfer tubes 21 are heated and brazed in a heating furnace.

As described above, in the heat exchanger 1 according to the present embodiment, the insertion amount of the heat transfer tubes 21 is regulated by the positioning ribs 102e. can be suppressed.

(Embodiment 4)
Next, a heat exchanger 1 according to Embodiment 4 of the present invention will be described. As shown in FIG. 10, the heat exchanger 1 according to the present embodiment differs from the first embodiment in that the second header member 107 includes a brazing pool 107e. Since other configurations are the same as those of the first embodiment, they are denoted by the same reference numerals.

As shown in FIG. 10, the second header member 107 according to the present embodiment has a brazing pool 107e on the inner surface forming the main flow path Mf. The brazing pool 107e is a recess formed near the joint of the second header member 107. As shown in FIG. More specifically, the brazing pool 107e is formed between the joint recess 107b and the mounting hole 107a for inserting the heat transfer tube 21, and is formed along the entire longitudinal direction of the second header member 107. It is

Next, a detailed procedure for joining the first header member 101 and the second header member 107 according to this embodiment will be described.

In the present embodiment, as in the first embodiment, the joint portion 101d of the first header member 101 is fitted into the joint recess 107b of the second header member 107, thereby connecting the first header member 101 and the second header member 101 together. is combined with the header member 107 of . Then, the projecting portion 107c of the second header member 107 is crimped to fix the first header member 101 and the second header member 107 together. After that, the joints of the first header member 101 and the second header member 107 are fixed by brazing.

In this embodiment, since the second header member 107 and the first header member 101, which are clad materials, are fixed by brazing, sufficient brazing material is supplied to the joint. Excess brazing material then flows into brazing pool 107e. As a result, when the first header member 101 and the second header member 107 are brazed, excess brazing material can be prevented from entering the heat transfer tubes 21 from the joints.

As described above, in the heat exchanger 1 according to the present embodiment, when the first header member 101 and the second header member 107 are fixed by brazing, excess brazing material enters the heat transfer tubes 21. Therefore, it is possible to prevent deterioration of the performance of the heat exchanger due to clogging of the communication holes 21a of the heat transfer tubes 21.

In the present embodiment, one brazing pool 107e is formed near each of the two joints, but the present invention is not limited to this. Two or more brazing pools 107e may be formed between the joint recess 107b and the mounting hole 107a. As a result, it is possible to reliably prevent the brazing material from entering the heat transfer tubes 21 .

In the present embodiment, the brazing pool 107e is uniformly formed over the entire lengthwise direction of the second header member 107, but the present invention is not limited to this. The brazing pools 107e may be intermittently formed in the longitudinal direction of the second header member 107. FIG.

In each of the above-described embodiments, the cross-sectional shape of the heat transfer tubes 21 connected to the header 10 is flat, but the shape is not limited to this. For example, a heat transfer tube 21 having a circular cross section may be used.

Reference Signs List 1 heat exchanger 10, 11 header 101, 102, 111 first header member 101a joint pipe connection portion 101b joint pipe insertion hole 101c bypass hole 101d, 102d joint portion 102e positioning rib 105, 106 , 107, 115 Second header member 105a, 107a, 115a Mounting hole 105b, 106b, 107b Joining recess 105c, 106c, 107c Projection 106d Stepped wall 107e Brazing reservoir 108 Cap 21 Heat transfer tube , 21a through-hole, 23 joint pipe, 23a connection portion, 23b through-hole, 31 radiation fin, Mf main channel, Bf bypass channel

Claims (4)

It has a first flow path for circulating the heat medium and a first U-shaped portion formed in a U shape in cross section, and the inner surface of the first U-shaped portion circulates the heat medium. a first header member that forms part of the inner surface of the second flow path that allows the
a second header member having a second U-shaped portion formed to have a U-shaped cross section and forming the second flow path in combination with the first header member;
The first header member is
a joint portion joined to the second header member at each tip of the first U-shaped portion, the tip portion of a curved portion having a U-shaped cross-sectional view of the first U-shaped portion; a straight portion extending from the tip portion;
The second header member is
It is provided on the inner surface of the second U-shaped portion at a position apart from each tip of the second U-shaped portion, and the inner surface of the second U-shaped portion is formed to be recessed toward the outer surface side. a joint recess in which each of the straight portions of the joint is inserted and an inner surface of the joint recess is brazed to an outer surface of the straight portion of the joint;
a protruding portion that is a tip portion of the second U-shaped portion that is crimped to the first header member and covers the outer surface of the first header member from the joint recess,
Header for heat exchanger. The first header member is
A positioning rib that regulates the insertion amount of the heat transfer tube inserted into the second header member,
The heat exchanger header according to claim 1. The second header member is
A brazing reservoir for allowing excess brazing material of the brazing material for joining the first header member and the second header member to flow therein,
The heat exchanger header according to claim 1 or 2. A heat exchanger header according to any one of claims 1 to 3,
Heat exchanger.

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