JPH0213791A - Heat exchanger - Google Patents

Abstract

PURPOSE:To realize the reduction of the weight of a product and improve the liquid sealing property as well as the strength of the same by a method wherein a superposed part between a substantially U-shaped fold part, formed along the whole periphery of the outer periphery of a first vessel body, and a side wall provided on a second vessel body is welded by ultrasonic welding throughout the whole periphery thereof. CONSTITUTION:An outlet and inlet port tank T1 is constituted of a second vessel body or a seat plate 3, into which one end of a tube 23 is inserted, and a first vessel or a lid plate 4, covering the seal plate 3. The seat plate 3 is provided with a base plate 31 and side walls 32, bent from the outer peripheral rims of the base plate 31 vertically substantially. The lid plate 4 is provided with a lid plate part 41 and substantially U-shaped fold parts 42 along the whole periphery of the outer periphery of the tip ends of the lid plate 4. The fold part 42 is constituted of a skirt part 43, a flange-type extended part 44 and a side wall part 45 while the side wall part 45 is bent vertically substantially from the outer peripheral rim of the flange type extended part 44 and is fitted into the side wall part 32 of the seat plate 3. The outer peripheral surface 46 of the side wall part 45 is welded to the inner peripheral surface 34 of the side wall part 32 of the seat plate 3 by ultrasonic welding along the whole periphery thereof.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a heat exchanger having a tank formed by joining two containers, and particularly to a heater core of a hot water heating system for a vehicle, a radiator of a vehicle engine, etc. It is suitable for use in heat exchangers such as

[Prior Art] Conventionally, as shown in FIG. 5, a heat exchanger 100 of this type has a core section 110 having a duplex 111 through which hot water flows, and a core section 110 that is joined to both ends of the core section 110. and a tank 120.

This tank 120 has a duplex 11 in which hot water flows.
A seat plate 130 into which the end of the seat plate 1 is inserted is installed, and this seat plate 1
30 is molded into a groove shape, and the cover plate 14 is placed in this groove portion 131.
0, and the groove 131 and the hem 141 were joined with a solder material 150 to obtain liquid tightness and strength.゛[Problems to be Solved by the Invention] However, the bonding using the solder material 150
The strength is low despite its high specific gravity, and in order to obtain the desired liquid-tightness and strength, it is necessary to use a large amount of solder material 150, resulting in a problem that the weight of the product becomes very large. .

For this reason, in the tank 220 of heat exchanger 2 described in Japanese Utility Model Application Publication No. 50-70569, as shown in FIG. 231 and 241 are overlapped and the periphery of the flange portion 231 and 241 is joined by seam welding using electric resistance welding.

Furthermore, in the tank 320 of the heat exchanger 300 described in Japanese Patent Publication No. 62-22078, as shown in FIG.
By seam welding the side wall 331 of the cover plate 340 and the hem 341 of the cover plate 340, the solder material 350 is melted and the seat plate 33
A method is shown in which the amount of solder material used is reduced by joining 0 and the cover plate 340.

However, in the conventional heat exchanger having the above configuration, when hot water flows into the tank and internal pressure is applied, the peeling force F-1Fb in the direction of the arrow in FIG.
41 and the welded part 310, a large stress is generated due to stress concentration, and there is a problem that the strength is low.

Further, some conventional heat exchangers employ electric resistance welding as the welding method for welding the cover plate and the seat plate. In this electric resistance welding, the welded portions of the seat plate and cover plate become molten during welding. Here, if brass is used for the seat plate and lid plate,
There was a problem in that the zinc in the brass precipitated, shortening the durable life of the product.

By joining by ultrasonic seam welding instead of joining by solder material, the present invention can reduce the weight of the product, improve liquid tightness and strength, and increase the durability and reliability of the product. The purpose is to provide a high heat exchanger.

[Means for Solving the Problems] The heat exchanger of the present invention includes a container body in which a substantially U-shaped folded portion is formed over the entire outer periphery, and a container body that is overlapped with the outer circumferential surface of the folded portion. a second container body having a side wall;
A structure including a tank formed by joining four overlapping parts of the folded part and the tuf+wall by ultrasonic welding over the entire circumference, and a plurality of tubes connected to the tank was adopted.

[Function] The heat exchanger of the present invention has the following effects due to the above structure.

The overlapping portion of the substantially U-shaped folded portion formed around the entire outer circumference of the first container body and the side wall provided on the second container body is bonded with solder material or By joining the folded part of the first container body and the side wall of the second container body by ultrasonic welding without using fusion welding, fluid flows into the inside of the tank of the heat exchanger, When internal pressure is applied, stress concentration is sufficiently alleviated,
Improves liquid tightness and strength. This makes it possible to extend the durability life against repeated application of internal pressure inside the tank.

[Effects of the Invention] The heat exchanger of the present invention has the following effects due to the above structure and operation.

The substantially U-shaped folded portion formed around the entire outer circumference of the first container body and the overlapping portion of the side wall provided on the second container body are joined together over the entire circumference by ultrasonic welding. By doing so, it is possible to reduce the weight of the product, improve its liquid tightness and strength, and extend its durability against repeated application of internal pressure inside the tank.

Furthermore, even when brass is used for the first container body and the second container body, since the folded part of the first container body and the side wall of the second container body are joined by ultrasonic welding, the zinc in the brass is Compared to joining by electric resistance welding, there is no precipitation of
The durable life of the product can be extended.

Therefore, a highly reliable heat exchanger can be provided.

[Example] The heat exchanger of the present invention will be explained based on the example shown in FIGS. 1 to 4. ' Figures 1 to 3 show a first embodiment of the present invention.
Figures 1 and 2 show a heater core of a hot water heating system for an automobile.

1 shows a heater core of a hot water heating system for an automobile. The heater core 1 includes a core part 2 having a plurality of tube rows, and an inlet/outlet tank T1 and an intermediate tank T2 joined to both ends 21 and 22 of the core part 2.

The core part 2 includes a large number of flat tubes 23 made of brass arranged in parallel from one side to the other, and each tube 23.
It is provided with corrugated fins 24 made of copper and joined by brazing in between.

The inlet/outlet tank T1 includes a seat plate 3 serving as a second container body into which one end of the tube 23 is inserted, and a lid plate 4 serving as a first container body covering the seat plate 3. Inlet/outlet tank] 1 has an inlet vibe 11 or tube 2 inside
3, hot water flows into the tube 23 or exit vibe 1
Flows into 2. The intermediate tank T2 includes a seat plate 5 serving as a second container body into which the other end of the tube 23 is inserted, and a lid plate 6 serving as a first container body covering the seat plate 5.

The seat plate 3 is made of brass with a thickness of about 0.4 mm, and the base plate 31
and a side wall portion 32 bent at a substantially right angle from the outer peripheral edge of the substrate portion 31.

The substrate portion 31 has a burring hole 33 into which the end of the tube 23 is inserted and is burred. In the burring hole 33, the ends of the tube 23 are joined by brazing.

The side wall portion 32 is bent inward from the outer peripheral edge of the substrate portion 31 at a substantially right angle. The lid plate 4 is joined to the inner peripheral surface 34 of the side wall portion 32 by ultrasonic welding.

The cover plate 4 is made of brass with a plate thickness of about 0.4 mm, and the cover plate part 41
and bent at a substantially right angle from the outer peripheral edge of the lid plate portion 41,
It has a substantially U-shaped folded portion 42 over the entire outer periphery of the tip.

The lid plate part 41 has an enemy shape, and the center part is the base plate part 3 of the seat plate 3.
Brass inlet vibrator 11 and outlet vibrator 12, which are joined to the central part of 1 and divided into an inlet tank and an outlet tank, and which are connected to hot water piping (not shown), are liquid-tightly joined by brazing. .

The folded portion 42 includes a hem portion 43, a brim-like extension portion 44, and a side wall portion 45.

The skirt portion 43 is bent at a substantially right angle from the outer peripheral edge of the lid plate portion 41 and extends in the direction of the base plate portion 31 of the seat plate 3.

The brim-like extension portion 44 is bent toward the outer circumferential side at a substantially right angle from the end of the hem portion 43 and extends in the outer circumferential direction.

The side wall portion 45 is bent at a substantially right angle from the outer peripheral edge of the brim-like extension portion 44 and is fitted into the side wall portion 32 of the seat plate 3 .

The outer circumferential surface 46 of the side wall section 45 is joined to the inner circumferential surface 34 of the side wall section 32 of the seat plate 3 by ultrasonic welding over the entire circumference.

In addition, when assembling the heater core 1, as shown in FIG. A jig 71 is fitted.

The seat plate 5 is made of brass and has a thickness of about 0.4 mm, and, like the seat plate 3, has a base plate and a side wall 52 bent at a substantially right angle from the outer periphery of the base plate.

Like the cover plate 4, the cover plate 6 is made of brass with a plate thickness of about 0.4 mm, and is overlapped with the cover plate part 61 and the inner peripheral surface of the side wall part 52 of the seat plate 5 from the cover plate part 61, and has a tip end. It has a substantially U-shaped folded portion 62 over the entire outer periphery.

The welding tool 7 includes a steel jig 71, a pressure roller 72, a horn 73, and an ultrasonic transmitter (not shown).

The tip of the receiver jig 71 is fitted into the groove 47 of the cover plate 4, and has such rigidity that it will not deform even when pressure is applied from the pressure roller 72. In addition, the jig 71 is relatively
It rotates around the pressure roller 72 so that the pressure roller 72 rolls over the entire circumference of the side wall portion 32 of.

The pressure roller 72 is made of hardened and tempered steel, and the support is placed between the side wall 32 of the seat plate 3 and the cover plate 4.
The side wall portions 45 of the two are sandwiched.

The horn 73 propagates ultrasonic waves generated by the ultrasonic transmitter to the pressure roller 72.

A method of joining the seat plate 3 and the cover plate 4 of this embodiment will be explained based on FIG. 1.

For the receiver, fit the tip of the jig 11 into the groove 47 of the cover plate 4.
The side wall portion 32 of the seat plate 3 and the side wall portion 45 of the lid plate 4
The receiver is firmly held between the jig 71 and the pressure roller 72, and while the pressure roller 72 applies pressure to the side wall 32 of the seat plate 3 and the side wall 45 of the cover plate 4, the horn 73 Ultrasonic vibrations are applied in a direction perpendicular to the advancing direction of the pressure roller 72 and parallel to the inner peripheral surface 34 of the side wall 32 of the seat plate 3 and the outer peripheral surface 46 of the side wall 45 of the cover plate 4.

By rolling the pressure roller 72 around the entire circumference of the side wall 32 of the seat plate 3 while applying ultrasonic vibration, the inner peripheral surface 34 of the side wall 32 of the seat plate 3 and the lid can be bonded together without using solder material. The overlapped portion A of the side wall portion 45 of the plate 4 and the outer circumferential surface 46 is joined by ultrasonic welding over the entire circumference.

The operation of the heater core 1 of this embodiment will be explained based on FIGS. 1 to 3.

When hot water flows into the tank 1'' from the engine (not shown) through the hot water piping and the inlet vibrator 11, internal pressure is applied to the inner peripheral surface of the hem 43 of the cover plate 4 in the direction of the arrow (left and right in the figure).

In a conventional heat exchanger, when hot water flows into the tank and internal pressure is applied, the peeling forces F1 and Fb are applied to the seat plate 230, as in the conventional heat exchanger tank 220 shown in FIG.
This is applied to the joint between the lid plate 240 and the seat plate 230, causing a large stress concentration and reducing the joint strength.Furthermore, internal pressure is applied to the interior of the lid plate 240 over time, causing damage to the seat plate 230 and the seat plate 24.
There was a fear that peeling would occur between the two and the hot water would leak.

However, in this embodiment, even when the internal pressure F in the direction of the arrow is applied to the inner circumferential surface of the hem portion 43 of the lid plate 4, the pressure is removed from the hem portion 43, the brim-shaped extension portion 44, and the side wall portion 45 of the lid plate 4. Since the folded part 42 is installed, the overlapping part A of the inner circumferential surface 34 of the side wall part 32 of the seat plate 3 and the outer circumferential surface 46 of the side wall part 45 of the cover plate 4 is located closer to the hem part 43 to which the internal pressure F0 is applied. are separated from each other, the stress concentration on the overlapping part A is sufficiently alleviated, and the strength can be significantly improved compared to the conventional method of joining the seat plate 3. Therefore, the side wall portion 32 of the seat plate 3 Separation between the inner circumferential surface 34 and the outer circumferential surface 46 of the side wall portion 45 of the cover plate 4 can be prevented, and leakage of hot water can be prevented. When an internal pressure F2 in the vertical direction is applied to the lid plate 41, a tangential peeling force F is applied to the side wall 32 of the seat plate 3 and the side wall 45 of the lid plate 4, as shown in FIG.

However, since ultrasonic welding provides extremely high strength against the tangential peeling force F (shearing force), the liquid tightness and strength of the overlapped part A do not deteriorate, and the tank 1
It is possible to extend the durability life against repeated application of internal pressure to the inside of 1. Furthermore, since the seat plate 3 and the cover plate 4 are joined only by ultrasonic welding without using a solder material, the weight of the product can be reduced. Furthermore, since the side wall portion 32 of the seat plate 3 and the folded portion 42 of the cover plate 4 are joined by ultrasonic welding, precipitation of zinc in the brass does not occur, so the durable life of the product can be extended. .

Therefore, a highly reliable heater core 1 can be provided.

FIG. 4 shows a heater core of an automobile hot water type @chamber device employing a second embodiment of the present invention.

(The same functional objects as in the first embodiment are given the same numbers.) In this embodiment, the seat plate 8 is arranged horizontally as the first container body, and the lid plate 9 is configured as the second container body.

The tank 1'1 is provided with a folded part 82 extending in the outer circumferential direction from the end of the base plate part 81 of the brass seat plate 8. The folded portion 82 is composed of an inner wall portion 83, a brim-like extension portion 84, and an outer wall portion 85.

The inner wall portion 83 is bent at a substantially right angle from the outer peripheral edge of the base plate portion 81 and extends in the direction of the cover plate portion 91 of the cover plate 9 .

The flange-like extending portion 84 is bent toward the outer circumferential side at a substantially right angle from the end of the inner wall portion 83 and extends in the outer circumferential direction.

The outer wall portion 85 is bent at a substantially right angle from the outer peripheral edge of the brim-like extension portion 84, and serves as a hem portion 9 as a side wall of the brass cover plate 9.
Fits into 2. The outer circumferential surface 86 of the outer wall portion 85 is joined to the inner circumferential surface 93 of the skirt portion 92 of the lid plate 9 by ultrasonic welding.

[Other Examples] In this example, the heat exchanger of the present invention was used in the heater core tank of a hot water heating system for an automobile. It may also be used in heat exchangers such as radiators of engines of vehicles or ships, and refrigerant evaporators and refrigerant condensers of air-conditioning devices of vehicles or ships.

In this embodiment, tanks are attached to both core parts, but the tank may be attached to only one of the core parts.

The material and shape of the seat plate and tank may be brass, aluminum, or aluminum alloy, as long as the welded part can be ultrasonically welded and a tangential peeling force is applied to the welded part when internal pressure is applied. , copper, and various other materials and shapes can be selected.

In this embodiment, the folded part is formed into a substantially U-shape, but if a groove into which the tip of the jig 71 can be fitted can be formed in the folded part, the receiver can be shaped into a substantially ■-shape, a substantially C-shape, or a substantially Wa-shape. It may be formed into a substantially U-shape such as a U-shape, and the shape of the tip of the receiver jig can be changed as appropriate.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the welded portion between the seat plate and the lid plate of the heater core tank of an automobile hot water heating system employing the first embodiment of the heat exchanger of the present invention, and FIG. FIG. 3 is a front view showing the heater core of the type heating device, and FIG. 3 is an enlarged view of the main part of FIG. FIG. 4 is a sectional view showing a welded portion between a seat plate and a cover plate in a tank of a heater core of a hot water type heating system for an automobile employing a second embodiment of the heat exchanger of the present invention. Fig. 5 is a sectional view showing the joint between the seat plate and the cover plate in a conventional heat exchanger, Fig. 6 is an enlarged view of the main part of the welded part between the seat plate and the cover plate in a conventional heater core tank, and Fig. FIG. 7 is a sectional view showing a joint between a seat plate and a lid plate in a tank of a conventional heat exchanger. In the diagram 1... Heater core (heat exchanger) 2... Core part
3.5 Seat plate (second container body) 4.6 Lid plate (first container body) 8 Seat plate (first container body) 9
... Lid plate (second container body) 23 ... Tube 31.
...Substrate part 32...Side wall part (side wall) 42.82...
・Folded part 92...Hem part (side Ai) T,,'l',・
··tank

Claims (1)

[Scope of Claims] 1) (a) A first container body in which a substantially U-shaped folded part is formed over the entire outer periphery, and a second container body having a side wall superimposed on the outer peripheral surface of the folded part. A tank consisting of a container body, in which the overlapped part of the folded part and the side wall are joined by ultrasonic welding over the entire circumference; and (b) a plurality of tubes connected to the tank. heat exchanger.