JP2003042669A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger which prevents a surplus of clad solder material on the tank inner surface from flowing into tubes of a core. SOLUTION: The heat exchanger has a tank 110 having at least one opening at the end and a solder material 111 cladding the inner surface, a core 120 composed of a plurality of stacked tubes 121 each composed of two tube plates 121a, 122b, and a plate 130 closing the opening 112 of the tank 110. The core 120 is shed in the tank 110 and the plate 130 is soldered to the opening 112 of the tank 110. The tank has a groove 114 cut into the entire inner surface of the side wall 113 extending from the opening of the tank 110 to the opposite side approximately in parallel to the plate 130. Preferably, a plurality of grooves 114 are provided therefor, and further preferably applied to those having thin fins 112 disposed in the tubes 121.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger, and is effectively applied to an oil cooler for cooling engine oil of a vehicle, working oil for an automatic transmission and the like and brazing and joining thereof.

[0002]

2. Description of the Related Art As a conventional heat exchanger for cooling vehicle oil, for example, an oil cooler 100 as shown in FIG.
It has been known. (Japanese Patent Laid-Open No. 2000-204920, etc.) In this oil cooler 100, a core portion 120 is housed in a cylindrical tank 110 having one end opened, the opening side is closed by a plate 130, and the surface of each member is clad. It is brazed together by a brazing material.
The core part 120 includes two tube plates 121.
The tube 121 formed of a and 121b is laminated, and the inner fin 1
22 is provided.

The oil flowing in the tube 121 of the core portion 120 and the inside of the tank 110 and the core portion 120
The oil is cooled by heat exchange with the cooling water flowing between the tubes 121.

[0004]

However, as shown in FIG. 5, at the portion where the inner surface of the tank 110 and the core portion 120 are not directly joined (specifically, the cylindrical side wall 113) during brazing, The brazing filler metal 111 clad in the tank 110 becomes an excess, and the brazing filler metal 11
1 drops on the plate 130 and flows into the tube 121 from between the two tube plates 121a and 121b. As a result, brazing is caused in the tube 121, and the inner fin 122 is melted.

As a matter of course, the space inside the tube 121 is reduced by the wax reservoir, and the oil passage resistance is increased. Further, the melting of the inner fin 122 causes a decrease in performance and a decrease in pressure strength.

In view of the above problems, it is an object of the present invention to provide a heat exchanger capable of preventing an excessive amount of the clad brazing material on the inner surface of the tank from flowing into the tube of the core portion.

[0007]

The present invention employs the following technical means in order to achieve the above object.

According to the first aspect of the invention, a tank (110) having at least one end opened and a brazing material (111) clad on the inner surface, and two tube plates (12).
1a, 122b) has a core part (120) in which a plurality of tubes (121) are laminated, and a plate (130) for closing an opening (112) of the tank (110),
In the heat exchanger in which the core part (120) is housed in the tank (110) and the plate (130) is brazed at the opening (112) of the tank (110), from the opening side of the tank (110). The inner surface of the side wall (113) extending toward the counter opening side is characterized in that a groove (114) substantially parallel to the plate (130) is provided over the entire circumference.

When brazing this heat exchanger with the plate (130) on the lower surface, the surplus brazing material (111) clad on the side wall (113) on the inner surface of the tank (110) is added to the plate (130). ) Side, but in the present invention, the groove (114) provided in the side wall (113).
As a result, the excess brazing material (111) can be prevented from flowing into the tube (121) from the plate (130).

According to the second aspect of the invention, the groove portion (11
4) is characterized in that a plurality is provided.

As a result, the groove portion (114) can be secured enough to absorb the excess brazing filler metal (111), and the excess brazing filler metal (111) is surely transferred from the plate (130) into the tube (121). Inflow can be prevented.

Further, in a member having a thinner plate thickness, it is easily melted by the inflowing brazing material, and the tube plates (121a, 122a) are provided as in the invention of claim 3.
The fin (122), which is thinner than the plate (b), is attached to the tube (1
21) The heat exchanger provided in 21) is provided with claim 1 or claim 2.
It is particularly desirable to apply the invention described in 1.

The reference numerals in parentheses of the above means indicate the corresponding relationship with the concrete means described in the embodiments described later.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention is shown in FIGS. FIG. 1 shows an example in which the present invention is applied to an oil cooler 100 as a heat exchanger that cools vehicle engine oil (hereinafter abbreviated as oil).

First, the overall structure will be described with reference to FIG.
Each member of the oil cooler 100 is aluminum or aluminum alloy (for example, Al-Mn-Cu based alloy).
The tank 110 is a so-called aluminum round oil cooler having a cylindrical shape, which is brazed integrally. In this oil cooler 100, a core part 120 in which a plurality of tubes 121 are laminated is accommodated from an opening 112 of a tank 110, and the opening 112 is closed by a plate 130.

The core part 120 has inner fins 122 inserted therein and a plurality of tubes 121 through which oil flows, which are laminated, and water-side fins 123 are interposed between the tubes 121.

The tube 121 has a circular appearance 2
It is formed of two tube plates 121a and 121b. Each of the tube plates 121a and 121b has an oil hole 121c that is perforated in a predetermined shape.
Is provided. And each tube plate 121
A brazing material is clad on the surfaces of the a and 121b on the side where the inner fins 122 abut, and the inner fins 122 made of a bare material are brazed. Further, a sacrificial corrosion material is clad on the surface of each tube plate 121a, 121b on which the water-side fins 123 abut, and the brazing material clad on the front and back surfaces of the water-side fins 123
Each tube plate 121a, 121b and water side fin 1
23 is brazed. The inner fin 12
2, the water side fin 123 is each tube plate 121a,
The plate thickness is set smaller than that of 121b.

The tubes 121 are sequentially laminated, and the tubes 121 are crimped to each other between the oil holes 121c and brazed at the crimped portions so that the tubes 121 communicate with each other.

The tank 110 is open at one end (opening 1
12), and a side wall 11 extending from the opening side to the opposite opening side
3 is a cylindrical container having an upper wall 115 and a flat plate member formed by deep drawing.
A brazing material 111 is clad on the inner surface, and the uppermost part of the core part 120 and the outer peripheral part of the plate 130 described later are brazed by the brazing material 111.

Further, on the upper wall 115 of the tank 110, an oil inflow hole 116 and an oil outflow hole 117 are provided at a portion corresponding to the oil hole 121c of the tube 121,
An oil inflow pipe 151 and an oil outflow pipe 152 are fitted and brazed to both the holes 116 and 117. Both pipes 151 and 152 are adapted to communicate with the inside of the tube 121.

A cooling water inflow hole 118 is provided in the side wall 113 of the tank 110, and the cooling water inflow hole 118 is provided.
The cooling water inflow pipe 153 is fitted to and brazed. The cooling water inflow pipe 153 is connected to the tank 11
I am trying to communicate with the inside of 0. A cooling water outflow pipe (not shown) is provided on the side wall 113 of the tank 110, similarly to the cooling water inflow pipe 153.

A plate 130 is provided in the opening 112 of the tank 110, and the clad brazing material 1 of the tank 110 is provided.
It is brazed by 11 so that this opening 112 is closed. The plate 130 is a circular flat plate member on which the outer periphery of the plate is flanged, and a brazing material is clad on the lower surface in the drawing. The lower plate 140 is brazed to the plate 130.

Next, the main part of the present invention will be described with reference to FIG. On the inner surface of the side wall 113 of the tank 110, a plurality of groove portions 114 that are substantially parallel to the plate 130 are provided over the entire circumference. The groove 114 is formed by pressing in the initial step of deep drawing when the tank 110 is molded. The groove 114 may be formed by cutting after forming the tank 110.

The oil cooler 100 configured as described above
Cools the oil by heat exchange with cooling water. That is,
The oil flows in through the oil inflow pipe 151, flows through the tube 121 in which the inner fin 122 is inserted, and flows out through the oil outflow pipe 152, as indicated by the arrow in FIG. 1. At this time, cooling water flows in from the cooling water inflow pipe 153, flows in the tank 110 and between the tubes 121 in which the water-side fins 123 are interposed, and flows out from a cooling water outflow pipe (not shown). As a result, the heat of the oil is transferred to the cooling water side and cooled.

The groove 114, which is the main part of the present invention, is
The function and effect are exhibited during brazing, and the function and effect will be described below after briefly describing the method for manufacturing the oil cooler 100.

First, the core portion 120 is assembled. In stacking the tube 121 and both fins 122 and 123, here, first, the water side fin 123 is previously interposed between the tube plate 121a and the tube plate 121b, and is caulked between the oil holes 121c. . Then, the lowermost tube plate 121b is set on the plate 130, the inner fins 122 are set on this, and both plates 121a, 121b which have been caulked in advance with the water side fins 123 interposed therebetween as described above are set. Set, and then stack alternately. At this time, the tube plates 121a and 121b sandwiching the inner fin 122 form the tube 121 through which the oil flows. When stacking the tubes 121, the oil holes 1 of the tube plates 121a and 121b are formed by a rod-shaped jig that penetrates through the jig holes 131 provided in the plate 130.
21c is positioned. (Core part assembling step) Next, the oil inflow hole 151, the oil outflow hole 117, the cooling water inflow hole 118, and the cooling water outflow hole (not shown) of the tank 110 are respectively connected to the oil inflow pipe 151, the oil outflow pipe 152, and the cooling water inflow. The pipe 153 and a cooling water outflow pipe (not shown) are fitted together. And each pipe 15
A ring-shaped brazing material is set at the roots of the cooling water outflow pipes 1 to 153 and the cooling water outflow pipe (not shown). (Pipe Assembling Step) Then, the assembled core portion 120 is housed in the tank 110 together with the plate 130 through the opening 112 of the tank 110, and the plate 130 is press-fitted into the tank 110. (Tank / core part assembling step) Then, a flux (wet flux) is applied to the assembled body.
(Flux applying step) Then, the lower plate 140 is set (at this time, the jig hole 131 of the plate 130 is closed), and fixed by a jig so that a predetermined load is applied in the vertical direction. Then, the oil cooler 100 is completed by putting it in the furnace in the vertical posture shown in FIG. 1 and brazing them together. (Brazing process) In the brazing process, the members are integrally brazed by the brazing material previously clad at the necessary locations,
Most of the side wall 113 of the tank 110 does not have a member that directly abuts, and the brazing material 111 in this part is an excess. In the case of a conventional type, as described in the section of the prior art, this excess brazing filler metal 111 drops and the plate 1
Although there was a problem of flowing into the lowermost tube 121 through 30, according to the present invention, since the groove portion 114 is provided, the brazing filler metal 111 is provided in the groove portion 114 as shown in FIG. The excess brazing material 1 will start to accumulate
11 can be prevented from flowing into the tube 121 from the plate 130. Also, the inner fin 122 having a small plate thickness disposed in the tube 121 is not melted.

Further, since a plurality of groove portions 114 are provided, the excess brazing filler metal 111 is surely provided in the groove portion 11.
Can be absorbed at 4.

Incidentally, the concave shape and the number of the groove portions 114 are determined by the tank 1
It may be appropriately provided according to the amount of the brazing filler metal 111 to be clad in advance.

In the above embodiment, the aluminum round oil cooler 10 for cooling the engine oil is used as the heat exchanger.
However, the present invention is not limited to this, and other fluids (for example,
Hydraulic oil for automatic transmission, etc.)
For heat exchangers and shapes (such as square ones),
It may be applied to a heat exchanger or the like having different materials (such as those using stainless steel or copper material).

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an entire heat exchanger according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a tank A portion in FIG.

FIG. 3 is a cross-sectional view showing a flow state of a brazing material at the time of brazing in FIG.

FIG. 4 is a cross-sectional view showing an entire heat exchanger according to a conventional technique.

5 is an enlarged cross-sectional view showing a B part in FIG.

[Explanation of symbols]

100 oil cooler (heat exchanger) 110 tank 111 brazing material 112 opening 113 side wall 114 groove 120 core 121 tubes 121a tube plate 121b tube plate 122 Inner fin (fin) 130 plates

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) // B23K 101: 14 B23K 101: 14

Claims (3)

[Claims] 1. A core portion in which a tank (110) having at least one end opened and having a brazing material (111) clad on an inner surface thereof, and a plurality of tubes (121) composed of two tube plates (121a, 122b) are laminated. (12
0) and a plate (130) that closes the opening (112) of the tank (110), and the core part (120) is housed in the tank (110) to provide the plate (130). ) Is the tank (11
In the heat exchanger brazed at the opening (112) of (0), the plate (13) is provided on the inner surface of the side wall (113) extending from the opening side of the tank (110) toward the anti-opening side.
The heat exchanger is characterized in that a groove (114) substantially parallel to 0) is provided over the entire circumference. 2. The heat exchanger according to claim 1, wherein a plurality of the groove portions (114) are provided. 3. The fin (122) having a thinner plate thickness than the tube plates (121a, 122b) is disposed inside the tube (121). The heat exchanger according to any one of 1.