JP2603363Y2 - Heat exchanger - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a heat exchanger mainly used for a vehicle air conditioner.

[0002]

2. Description of the Related Art In a heat exchanger in which a tube element through which a heat exchange medium passes is laminated via a fin, and an inlet / outlet portion which serves as an inlet / outlet of the heat exchange medium is integrally formed in a tank of the tube element. Must be fixed to the entrance by means such as torch brazing. In this case, since the thickness of the plate at the entrance is as thin as about 0.6 mm, there is an inconvenience that the entrance is melted during torch brazing. To solve this problem,
As shown in FIG. 6, the tip of the brazing allowance 16 of the entrance / exit portion 3 is removed, and a washer 4 is externally fitted to this end. In this state, the heat exchanger is put into a furnace and the washer 4 is attached to the entrance / exit portion 3. It is conceivable that brazing is performed in advance, and the washer 4 absorbs heat generated during brazing of the torch of the entrance / exit pipe 5 to prevent the entrance / exit portion 3 from melting.

[0003]

However, the brazing allowance 16 includes a joining portion 16a protruding along the joining surface.
In the case of being constituted by the flange portion 16b which bends and extends from the edge of the mating portion 16a, even if the washer 4 is fitted to the tip of the entrance 3 as shown in FIG. When the torch brazing of the inlet / outlet pipe 5 is performed, the flame hits this protruding portion, and the brazing allowance 16 is heated, and the inlet / outlet itself melts. Or the brazing material at the time of brazing in the furnace may be re-melted to cause airtight leakage.

[0004] In particular, if the radial thickness of the washer 4 is reduced as shown by a broken line in order to reduce material costs, the portion of the brazing margin 16 protruding from the periphery of the washer 4 becomes large, and the above disadvantages are further reduced. I am concerned.

Therefore, in the present invention, the washer provided at the end of the entrance / exit portion prevents the flame at the time of brazing the torch from being applied to the brazing allowance as much as possible, thereby preventing damage to the entrance / exit portion and airtight leakage. It is an object to provide a heat exchanger.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the gist of the present invention is to provide a tank.
Molded plate having a bulge for forming and a bulge for forming a passage
Heat exchange between the pair of tanks and the pair of tanks.
Of each forming plate so that a medium passage is formed.
By joining brazing margins formed on the periphery,
A tube element is formed.
And are alternately stacked at a predetermined position.
Formed from the tube element tank at
The inlet / outlet portion extends from the bulging portion for forming a tank.
In the heat exchanger formed by a pair of bays,
The brazing allowance of the tube element having the entry / exit portion is
With the axial width of the washer fitted externally to the tip of the entrance
A washer that is resected and fits over the resected part
The end of the brazing allowance that comes into contact with the washer is
Is formed so that the protrusion amount is less than the thickness of
At the entrance, the washer is perpendicular to the entrance.
A plurality of convex portions to be held in the
A projection is provided to limit the insertion amount of the inlet pipe .

[0007]

[Action] Therefore, the tip of the brazing allowance at the entrance / exit is
Cut off only the width of the washer in the axial direction.
Formed so that the tip does not protrude beyond the radial direction of the washer
And abut the washer against the end and projection of the brazing allowance.
And brazing in the furnace together with the heat exchanger itself,
The washer can be accurately attached to the entrance and exit
When brazing the entrance pipe to the torch,
Since the flame does not directly hit the brazing cost,
Make sure that the wax is melted and flown by the flame of the torch.
That can solve the above-mentioned problems.
You. In addition, since a projection is formed at the entrance and exit,
You can easily set the insertion amount of the entrance pipe to a predetermined amount
Easy to braze the torch of the entrance pipe.
It will be able to do.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, a fin 2 is interposed between the stacked tube elements 1a and 1b, and the tube elements 1b and 1 arranged in the middle of the stacking are arranged.
b, the entrances 3 and 3 serving as entrances and exits of the heat exchange medium are formed so as to protrude, and the washers 4 and 4 are externally fitted to the entrances 3 and 3 and the entrances 3 and 3 to which the washers 4 and 4 are externally fitted.
The entrance pipes 5 and 5 are inserted in.

The tube elements 1a and 1b have a substantially rectangular shape, and are formed by forming the following forming plates 10a and 10b into two.
It is constructed by joining in the middle of the sheets.

The forming plates 10a and 10b are made of, for example, aluminum or an aluminum alloy, and are formed to a thickness of about 0.6 mm by pressing. The bulging portions 11 and 12 for forming tanks are provided at one end in the longitudinal direction. A ridge 13 is extended from the space between the tank-forming bulging portions 11 and 12 toward the other end, and the tank-forming bulging portion is provided around the periphery of the ridge 13. A substantially U-shaped passage-forming bulging portion 14 leading to 11 and 12 is bulged. Further, on the other end side of the forming plates 10a and 10b, a projecting portion 15 for defining the interval between the tube elements is formed to be bent.

Further, a brazing allowance 16 for brazing is formed on the periphery of the joint between the forming plates 10a and 10b so as to protrude outward.

Further, bay-shaped pieces 17, 17 are formed on the side of the tank-forming bulging portions 11, 12 of the molding plate 10b, and are formed by joining the bay-shaped pieces 17, 17. An entrance 3 having a circular cross section is formed.

By joining these two forming plates 10a and 10b in the middle, the tube elements 1a and 10b are joined together.
1b, a pair of tanks 18 and 19 are formed at one end from opposed tank-forming bulging portions 11 and 12, and a substantially U-shaped heat is formed inside the pair of tank-forming bulging portions 14 at the inside. An exchange medium passage 22 is formed, and the tank 1
8 and 19 communicate with each other through a heat exchange medium passage 22.

The tube elements 1a, 1
b, the tube element 1a is mainly laminated, and the tube element 1b is arranged in the middle of the lamination, and the tanks 18, 19 and the tube element abutting portion 15 at both ends are brought into contact with each other and a plurality of The tanks stacked and abutted on each other are connected to each tank forming bulging portion 1.
The tanks communicate with each other through tank communication holes 20 and 21 formed in the tanks 1 and 12, respectively.

A tank communication hole is not formed in the tank forming bulging portion in the front of the tube element 1 substantially in the center of the stack, so that the communication of the tank 18 in the front of the drawing is substantially divided at the center. And is divided into a left block and a right block. Further, the forming plate constituting each tube element is, for example, A300
A4004 is formed by attaching a brazing material made of an aluminum alloy containing silicon of A4004 to both surfaces of the aluminum material.

Therefore, this heat exchanger is provided with a heat exchange medium flowing from, for example, the inlet / outlet pipe 5 on the left side of the drawing to the inlet / outlet side tank group (constituted by the communication of the tank 18 on the front left side in the drawing) communicating therewith. , The heat exchange medium passage 22 of each tube element 1a, 1b of the left block
Inside the tank group (constituted by communication of all tanks 19 in the rear of the figure), and is moved in parallel in the tank group to move each tube element 1 of the right block.
Flow in the heat exchange medium passage 22a, 1b, are collected in the entrance / exit tank group of the right block (constituted by communication of the tank 18 on the front right side in the figure), and are discharged from the other entrance / exit pipe 5 on the right side in the figure ( Or the reverse path), so-called 4
It has a path flow pattern.

2 to 4 show a detailed structure near the entrance 3.

The bay-shaped pieces 17, 17 are provided with convex portions 23 which are formed at the same time as the press forming of the forming plate. In this embodiment, the protrusions 23 project hemispherically outward from the surface of the bay-shaped piece, and a predetermined space is provided between the brazing allowances 16 between the bay-shaped pieces. In this case, two are formed. Bay-like piece 1 from each convex part 23
The width up to the tip of 7 is the width (L
When the washer 4 is fitted to the entrance 3, the washer 4 comes into contact with the tip of the brazing allowance 16 and also comes into contact with the projection 23 at the same time to be positioned. It has become.

Further, in addition to the convex portion 23, a concave portion 24 projecting inward in a hemispherical shape is formed integrally with the bay-shaped pieces 17, 17 by press molding. Recess 24
Is formed between the convex portions 23 in this embodiment, and abuts against the tip of the entrance / exit pipe 5 inserted into the entrance / exit portion 3 to position the entrance / exit pipe 5. .

The brazing allowance 16 is formed by a mating portion 16a protruding from the surface of the bay-like pieces 17, 17 along the joint surface, and a flange portion 16b bent from the edge of the mating portion 16a and extended. The brazing allowance 16 provided in the entrance 3 is missing from the tip of the entrance 3 by the width (L1) of the washer 4. In addition, brazing fee 1
6 gradually decreases as the amount of protrusion of the mating portion 16a approaches the front end, and the flange portion 1
6b is removed, and the tip 16
The amount of protrusion of the tip of c is determined by the radial thickness (L
It is equal to or smaller than 2).

Here, the washer 4 is, for example, A300
A3 is made by attaching a brazing material made of an aluminum alloy containing silicon of A4004 to both surfaces of the aluminum material of No. 3 and has an axial width of 1 to 2 mm. Further, the outer diameter (L3) of the washer 4 is smaller than the width (L4) of the outer shell including the upper and lower brazing allowances 16 of the entrance / exit portion 3, in other words, the radial thickness (L2) of the washer 4. Is smaller than the protruding amount (L5) of a portion of the brazing margin 16 excluding the tip portion 16c.

In the above configuration, to assemble the heat exchanger, first, the tube elements 1a are alternately laminated with the fins 2 and temporarily assembled so that the tube elements 1b are located at desired positions. Then, the washer 4 is fitted to the entrance 3 by pressing it with a certain pressure in the laminating direction.
Thereafter, the tube is pressed in the laminating direction with the original assembling pressure, and in order to maintain the state, a crank is fitted so as to surround the entire laminated tube element, and brazing in a furnace is performed as it is. As a result, the washer 4 is soldered to the tip of the entrance 3. Then, to attach the entrance pipe 5 after the in-furnace brazing is completed,
The entrance / exit pipe 5 is inserted into the entrance / exit portion 3 until it comes into contact with the concave portion 24, the wire-shaped brazing material 25 is looped and applied to the end face of the washer 4, and the entrance / exit portion 3 and the entrance / exit pipe 5 are brazed by torch brazing. .

In such a work process, when the torch brazing of the entrance / exit pipe 5 to the entrance / exit portion 3 is performed,
Although a high temperature of about 10 degrees is locally applied to the entrance 3, the heat is absorbed by the washer 4 attached to the tip of the entrance 3. In addition, since the brazing allowance 16 does not protrude from the periphery of the washer 4, it is possible to prevent the brazing allowance 16 from directly receiving and dissolving the flame at the time of brazing the torch. It is possible to prevent the brazing material applied in the brazing allowance from remelting and flowing during brazing.

FIG. 5 shows another embodiment of the present invention. In this embodiment, the flange portion 16b is the same as that of FIG. 16a is a constant protrusion amount equal to or smaller than the radial thickness of the washer 4.

In such a configuration, the same operation and effect as those of the above-described embodiment can be obtained, and the flame at the time of brazing the torch can be more reliably avoided since the joining portion 16a is cut as compared with the above-described embodiment. it can.

In the present invention, the case where the entrance 3 is formed integrally with the forming plate is shown. However, in a heat exchanger having a configuration in which the entrance 3 is formed in a pipe shape independently of the forming plate. Are also available.

[0028]

[Effect of the invention] As described above, according to the invention,
Attach a washer to the end of the entrance and exit, and make the amount of protrusion at the tip of the brazing allowance less than the radial thickness of the washer , and
At the mouth, a convex part that keeps the position of the washer, an entrance and exit pipe
The protrusion that regulates the insertion amount of the
Easy positioning of the washer, and the position of the washer
Can be positioned precisely at the end, allowing access to the entrance
The insertion amount of the mouth pipe can be easily regulated,
At the time of torch brazing the entrance pipe to the entrance
In addition, the end of the brazing allowance does not protrude outside the washer
Prevents the torch flame from directly hitting the brazing
So that brazing material for brazing can be more reliably
It can be prevented from melting and flowing, and can prevent air leaks
Things.

[Brief description of the drawings]

FIG. 1 is a perspective view of a heat exchanger according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing the vicinity of an entrance and exit of the heat exchanger according to the present invention.

FIG. 3 is a side view showing the vicinity of the entrance and exit of the heat exchanger according to the present invention.

FIG. 4 is a view showing a bay-shaped piece constituting an entrance / exit portion of a heat exchanger, and a washer and an entrance / exit pipe brazed thereto;
The state which cut | disconnected by the joint surface of the bay-shaped piece is shown.

FIG. 5 is a side view showing another example near the entrance and exit of the heat exchanger according to the present invention.

FIG. 6 is an exploded perspective view showing the vicinity of an entrance / exit portion of a conventional heat exchanger.

FIG. 7 is a front view showing a state in which a washer is externally fitted to an entrance / exit portion of a conventional heat exchanger.

[Explanation of symbols]

 3 Doorway 4 Washer 16 Brazing allowance 16a Fitting 16b Flange 16c Tip 17 Bay-shaped piece

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-1299691 (JP, U) JP-A-3-39047 (Description of the specification and drawings attached to the application form JP-A-4-1299691) (58) Field of investigation (Int. Cl. ⁷ , DB name) F28F 9/02 301

Claims (1)

(57) [Scope of request for utility model registration] 1. A bulging portion for forming a tank and a bulging portion for forming a passage.
A pair of tanks and a pair of tanks.
So that a heat exchanger medium passage communicating the ink
Joining the brazing margin formed on the periphery of each forming plate
To form a tube element,
And fins are alternately laminated
With the tube element tank in place
The entrance formed by extending from the
Heat formed by a pair of bay-shaped pieces extending from the bulge
In the exchanger, the brazing allowance of the tube element having the inlet / outlet portion
Is the axial direction of the washer fitted externally at the entrance
A waist that is cut in width and that fits over the cut
The end of the brazing allowance that contacts the washer is the diameter of the washer.
When formed so that the amount of protrusion is less than the thickness in the direction
At the entrance, the washer is attached to the entrance.
And a plurality of convex portions for holding vertically,
A projection is provided to limit the insertion amount of the entrance pipe
A heat exchanger.