JP6766656B2 - Heat exchanger - Google Patents

Description

The present invention relates to a heat exchanger provided with a tube through which a fluid flows.

Conventionally, for example, Patent Document 1 has proposed a heat exchanger provided with a tube through which a fluid flows. The tube is formed in a one-stroke shape by bending one flat plate.

The outline of the tube is as follows. First, the central portion of the flat plate is folded so as to project perpendicular to the plane of the flat plate. As a result, the folded portion of the flat plate has a T-shaped cross section. Further, the tip of one end of the flat plate is in contact with one wall surface of the folded portion with reference to the folded portion of the flat plate, and the tip of the other end of the flat plate is in contact with the other wall surface of the folded portion. The flat plate is folded back. Then, each tip portion and the folded portion are brazed. As a result, a tube provided with two hollow portions is formed from one flat plate.

Japanese Patent No. 2792405

Usually, one of the two sides of the flat plate, which mainly constitutes the outer wall surface of the tube, is pre-coated with a flux that removes the oxide film during brazing. Further, during brazing, the flux melts at a high temperature, and brazing becomes possible by removing the oxide film.

Here, the excess flux at the time of brazing flows through the gap between the tip portion of the flat plate and the folded portion at the time of melting and enters the inside of the tube. Therefore, the flux that was not used for brazing remains inside the tube as a residue. This residue did not affect the quality of conventional heat exchangers.

However, in fuel cell vehicles that have become popular in recent years, it is required to reduce the conductivity in the cooling water in order to prevent electric shock, that is, to reduce the flux remaining inside the tube. Therefore, a step of cleaning the flux existing inside the tube with warm water or the like for a long time after brazing is required.

In view of the above points, it is an object of the present invention to provide a heat exchanger having a structure capable of keeping the flux remaining inside the tube within an allowable range after brazing.

In order to achieve the above object, in the invention of claim 1, the heat exchanger has a tube (100) through which a fluid flows inside and fins (200) joined to an outer wall surface (101) of the tube. I have.

The tube is formed by bending the rectangular first plate material (111) so that the cross section parallel to the first direction is T-shaped, so that the tube is first from one end portion (116) in the first direction. The first plate portion (112) up to the bent portion (117), the second plate portion (113) from the first bent portion to the first folded portion (118), and the second bent portion (119) from the first folded portion to the second bent portion (119). ), And a fourth plate portion (115) from the second bent portion to the other second end portion (120) in the first direction, and further, the first end portion. Each tip portion of the portion and the second end portion includes a first component (110) folded back toward the first folded portion side.

Further, in the tube, the first plate portion and the fourth plate portion are arranged so that the inlet portion (122) side of the groove portion (121) composed of the second plate portion, the first folded portion, and the third plate portion is located. By bending the second plate material (151) having one surface (152), the fifth plate portion (153) facing the first plate portion and the fourth plate portion with a brazable clearance, A second folded portion (154) in which one side of the second plate material in the first direction with respect to the first component is folded back toward the first component side, and a third bend bent from the second folded portion toward the first plate portion. It has a 6th plate part (155) up to the part (160), a part from the 3rd bent part to the 3rd end part (161), and a clearance that can be brazed to the 1st plate part and the 2nd plate part. From the seventh plate portion (156) facing each other, the third folded portion (157) in which the other side of the second plate material in the first direction with respect to the first component is folded back toward the first component side, and the third folded portion. The eighth plate portion (158) up to the fourth bent portion (162) bent toward the fourth plate portion side, the portion from the fourth bent portion to the fourth end portion (163), and the third plate portion and A second component (150) having a ninth plate portion (159) facing the fourth plate portion with a brazing clearance is provided.

Further, the first plate portion, the second plate portion, and the seventh plate portion are brazed, the third plate portion, the fourth plate portion, and the ninth plate portion are brazed, and the first plate portion and the fourth plate portion are brazed. The part and the fifth plate part are brazed and integrated, and the flux melted at the time of brazing is dammed by the tip bending shape of the first end part and the second end part, and the groove part. Due to the capillary phenomenon of, the gap between the 1st plate, the 2nd plate and the 7th plate, the gap between the 3rd plate, the 4th plate and the 9th plate, the 1st plate and the 4th plate It flows into the groove through the gap with the fifth plate.

According to this, even if the melted flux flows into the hollow portion (102, 103) composed of each component (110, 150), the flux is dammed by the tip bending shape of each end portion (116, 120 ). , The groove of the first component is absorbed by the groove due to the capillary phenomenon. Therefore, the flux remaining inside the tube after brazing can be kept within an allowable range.

The reference numerals in parentheses of each means described in this column and the scope of claims indicate the correspondence with the specific means described in the embodiments described later.

It is a front view of the heat exchanger which concerns on one Embodiment of this invention. It is sectional drawing of a tube. It is a perspective view of the 1st part. It is a perspective view of the 2nd component. It is sectional drawing of the tube which showed the flow of flux.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The heat exchanger according to one embodiment is applied to, for example, a heater core for heating a vehicle air conditioner of a fuel cell vehicle. The heater core for heating heats the air blown into the vehicle interior by exchanging heat between the engine cooling water (hot water) supplied by the water pump provided in the engine cooling water circuit and the air supplied by the blower fan. It is a heat exchanger for heating.

As shown in FIG. 1, the heat exchanger 1 includes a plurality of tubes 100, fins 200, header tank 300, and side plate (insert) 400.

Each tube 100 is a tubular component through which engine cooling water flows as a fluid inside. The fin 200 is a component that is joined to the outer wall surface 101 of the tube 100 to increase the heat transfer area with air and promote heat exchange between engine cooling water and air. The heat exchange core portion is composed of the tube 100 and the fins 200.

Further, the header tank 300 is a component that is arranged at both open ends of the tubes 100 and extends in the arrangement direction of the tubes 100 to communicate with the tubes 100. The side plate 400 is a component that forms a reinforcing member of the heat exchange core portion.

The tube 100, fins 200, header tank 300, and side plate 400 are all formed as a metal body such as aluminum or an aluminum alloy, and are integrated by joining the parts by brazing.

Next, a specific configuration of each tube 100 will be described. As shown in FIG. 2, each tube 100 is configured by combining a first component 110 and a second component 150. As a result, each tube 100 has two hollow portions 102 and 103. The parts 110 and 150 are manufactured by press bending.

The first component 110 is formed by bending a rectangular first plate member 111. As shown in FIG. 3, the first component 110 includes a first plate portion 112, a second plate portion 113, a third plate portion 114, and a fourth plate portion 115.

One direction of the plate surface of the first plate member 111, that is, the direction in which the first plate portion 112, the second plate portion 113, the third plate portion 114, and the fourth plate portion 115 are continuous in the first plate member 111 is defined as the first direction. To do. The first direction corresponds to the lateral direction of the first plate member 111. Further, the direction orthogonal to the first direction on the plate surface of the first plate member 111 is defined as the second direction. The second direction corresponds to the longitudinal direction of the first plate member 111.

The first plate portion 112 is a portion from one first end portion 116 in the first direction to the first bent portion 117. The first bent portion 117 is bent at a substantially right angle along the second direction of the first plate member 111. The second plate portion 113 is a portion from the first bent portion 117 to the U-shaped first folded portion 118.

The third plate portion 114 is a portion from the first folded portion 118 to the second bent portion 119. The second bent portion 119 is bent at a substantially right angle. The fourth plate portion 115 is a portion from the second bent portion 119 to the other second end portion 120 in the first direction.

Further, each of the tip portions of the first end portion 116 and the second end portion 120 has a bent tip shape that is folded back toward the first folded portion 118. Therefore, the first component 110 is configured so that the cross section parallel to the first direction is T-shaped because the first plate member 111 is folded back once.

Further, the first plate portion 112 has a groove portion 121 composed of a second plate portion 113, a first folded portion 118, and a third plate portion 114. In the groove portion 121, the distance between the first bent portion 117 and the second bent portion 119 constituting the inlet portion 122 is the first of the distances between the second plate portion 113 and the third plate portion 114 forming the groove portion 121. It is configured to be narrower than the distance on the folded-back portion 118 side.

As shown in FIG. 1, the second component 150 is configured by bending the second plate member 151. The first plate portion 112 and the fourth plate portion 115 are arranged on one surface 152 of the second plate member 151 so that the inlet portion 122 side of the groove portion 121 of the first component 110 is located.

As shown in FIG. 4, the second component 150 includes a fifth plate portion 153, a second folded portion 154, a sixth plate portion 155, a seventh plate portion 156, a third folded portion 157, and an eighth plate portion 158. It also has a ninth plate portion 159.

The fifth plate portion 153 is a portion facing the first plate portion 112 and the fourth plate portion 115 of the first component 110 with a brazing clearance. The second folded-back portion 154 is a portion in which one of the first directions of the second plate member 151 is folded back toward the first component 110 with the first component 110 as a reference. The second folded-back portion 154 is bent so that the cross section is U-shaped.

The sixth plate portion 155 is a portion from the second folded portion 154 to the third bent portion 160 bent toward the first plate portion 112. The third bent portion 160 is bent at a substantially right angle. The seventh plate portion 156 is a portion from the third bent portion 160 to the third end portion 161 and is a portion facing the first plate portion 112 and the second plate portion 113 with a brazable clearance. ..

The third folded-back portion 157 is a portion in which the other side of the second plate member 151 in the first direction is folded back toward the first component 110 with the first component 110 as a reference. The third folded-back portion 157 is bent so that the cross section is U-shaped.

The eighth plate portion 158 is a portion from the third folded portion 157 to the fourth bent portion 162 bent toward the fourth plate portion 115 . The fourth bent portion 162 is bent at a substantially right angle. The ninth plate portion 159 is a portion from the fourth bent portion 162 to the fourth end portion 163, and is a portion facing the third plate portion 114 and the fourth plate portion 115 with a brazing clearance. ..

Then, the first plate portion 112, the second plate portion 113, and the seventh plate portion 156 are brazed, and the third plate portion 114, the fourth plate portion 115, and the ninth plate portion 159 are brazed, and the first plate portion is brazed. The plate portion 112, the fourth plate portion 115, and the fifth plate portion 153 are brazed and integrated. The brazing material and the flux are provided on the entire surface of the first component 110 where the first plate portion 112 and the fourth plate portion 115 are in contact with the second plate member 151, and the one surface 152 of the second component 150 is It is provided on the entire other surface on the opposite side.

At the time of brazing, the fins 200 are brazed to the outer wall surface 101 of each tube 100 at the same time as the brazing of each tube 100.

At the time of brazing, the flux melted before the brazing material gets wet on the surfaces of the parts 110 and 150. Then, as shown in FIG. 5, the melted flux flows from the outer wall surface 101 of the tube 100 to the gap between the second plate portion 113 and the seventh plate portion 156 and between the third plate portion 114 and the ninth plate portion 159. It flows into the inside of the tube 100 through the gap. However, the flux is temporarily dammed by the bent tip shapes of the first end 116 and the second end 120.

Further, the flux is sucked into the groove 121 due to the capillary phenomenon of the groove 121. As a result, the flux temporarily dammed by the bent shape of the tips of the first end 116 and the second end 120, the gap between the first plate 112 and the second plate 113 and the seventh plate 156, and the third plate. The flux in the gap between the portion 114 and the fourth plate portion 115 and the ninth plate portion 159 and the flux in the gap between the first plate portion 112 and the fourth plate portion 115 and the fifth plate portion 153 is absorbed by the groove portion 121.

In this way, the melted flux is the gap between the first plate portion 112 and the second plate portion 113 and the seventh plate portion 156, and the gap between the third plate portion 114 and the fourth plate portion 115 and the ninth plate portion 159. , Flows into the groove 121 through the gap between the first plate 112, the fourth plate 115, and the fifth plate 153. That is, the melted flux flows into the tube 100, but travels through the gaps and the tip portions of the end portions 116 and 120 to reach the groove portion 121.

In addition, in FIG. 2 and FIG. 5, it is drawn so that there is a gap in the brazed portion, because the first part 110 and the second part 150 are drawn separately. When the brazing is completed, the gap disappears and it becomes a joint.

As described above, the melted flux is dammed by the bent shape of the tips of the end portions 116 and 120 , and is absorbed by the groove portion 121 of the first component 110 by the capillary phenomenon. Therefore, the flux that has flowed into the tube 100 does not wet and spread to the hollow portions 102 and 103 of the tube 100. Therefore, the flux remaining inside the tube 100 after brazing can be kept within an allowable range. Further, it is possible to eliminate the step of cleaning the flux existing inside the tube 100 with warm water or the like for a long time after brazing.

Further, since the width of the inlet portion 122 of the groove portion 121 is narrower than the width of the inside of the groove portion 121, it is possible to easily cause a capillary phenomenon and to easily draw in flux.

Since the required flux amount is reduced as an absolute amount, brazing can be performed even if the coating amount is reduced. In recent years, fluxless brazing technology that does not use flux has been studied, but it is said that fluxless brazing is not possible for the equipment currently in use. However, since the flux remaining inside the tube 100 can be contained within an allowable range, the current equipment can be used as it is.

(Other embodiments)
The configuration of the heat exchanger 1 shown in the above embodiment is an example, and the configuration is not limited to the configuration shown above, and other configurations capable of realizing the present invention can be used. For example, the heat exchanger 1 may be applied to other than the fuel cell vehicle.

Further, although the first component 110 is configured by folding back the first plate member 111 once, for example, it may be configured so that a plurality of the first plate members 110 are folded back to form a wavy cross section. As a result, since a plurality of groove portions 121 are formed, the amount of flux absorbed by each groove portion 121 can be increased.

100 tube, 101 outer wall surface, 110 first part, 111 first plate material, 112 first plate part, 113 second plate part, 114 third plate part, 115 fourth plate part, 116 first end part, 117 first Bending part, 118 1st folded part, 119 2nd bending part, 120 2nd end part, 121 groove part, 122 entrance part, 150 2nd part, 151 2nd plate material, 152 1st surface, 153 5th plate part, 154th 2nd Folded part, 155 6th plate part, 156 7th plate part, 157 3rd folded part, 158 8th plate part, 159 9th plate part, 160 3rd bending part, 161 3rd end part, 162 4th bending part , 163 4th end

Claims (2)

A heat exchanger comprising a tube (100) through which a fluid flows inside and fins (200) joined to an outer wall surface (101) of the tube.
The tube
The rectangular first plate material (111) is bent so that the cross section parallel to the first direction is T-shaped, so that the first bent portion (116) from one of the first directions is bent. The first plate portion (112) up to (117), the second plate portion (113) from the first bent portion to the first folded portion (118), and the first bent portion to the second bent portion (119). ), And a fourth plate portion (115) from the second bent portion to the other second end portion (120) in the first direction. A first part (110) in which the tip portions of the first end portion and the second end portion are folded back toward the first folded portion side, and
The first plate portion and the fourth plate portion are arranged so that the inlet portion (122) side of the groove portion (121) formed by the second plate portion, the first folded portion, and the third plate portion is located. By bending the second plate material (151) having one surface (152), the fifth plate portion (153) facing the first plate portion and the fourth plate portion with a brazable clearance. When,
A second folded portion (154) in which one of the first directions of the second plate material is folded back toward the first component side with the first component as a reference, and from the second folded portion to the first plate portion side. The sixth plate portion (155) up to the bent third bent portion (160), the portion from the third bent portion to the third end portion (161), and the first plate portion and the second plate. A seventh plate portion (156) facing the portion with a brazing clearance and the other side of the second plate material in the first direction with reference to the first component are folded back toward the first component side. The 3 folded portion (157), the 8th plate portion (158) from the 3rd folded portion to the 4th bent portion (162) bent toward the 4th plate portion side, and the 4th to 4th bent portions. A second component (150) having a portion up to the end portion (163) and a ninth plate portion (159) facing the third plate portion and the fourth plate portion with a brazing clearance. When,
With
Further, the first plate portion, the second plate portion, and the seventh plate portion are brazed, and the third plate portion, the fourth plate portion, and the ninth plate portion are brazed, and the first plate portion is brazed. The first plate portion, the fourth plate portion, and the fifth plate portion are brazed and integrated, and the flux melted during the brazing is the first end portion and the second end portion. In addition to being brazed to the bent shape of the tip, the gap between the first plate portion and the second plate portion and the seventh plate portion, the third plate portion and the fourth plate portion due to the capillary phenomenon of the groove portion. A heat exchanger that flows into the groove portion through a gap between the ninth plate portion and the gap between the first plate portion and the fourth plate portion and the fifth plate portion. In the groove portion, the distance between the first bent portion and the second bent portion forming the inlet portion is the first of the distances between the second plate portion and the third plate portion forming the groove portion. The heat exchanger according to claim 1, which is configured to be narrower than the distance on the folded-back portion side.

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