JP2001021288A - Stacked type heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To braze a block joint for connection and a heat exchanger body with a sufficient strength, irrespective of the dimension of the width of the heat exchanger body. SOLUTION: This heat exchanger has a stacked type heat exchanger body 1 having an end plate wherein a fluid lead-in port 8c and a fluid lead-out port 7c are opened in juxtaposition and a block joint for connection having two through holes 2a and 2b communicating with the fluid lead-in port 8c and the fluid lead-out port 7c. Insertion parts 7b and 8b having taper parts narrowing toward the fore end sides are formed like projections at the respective circumferential edges of the lead-in port 8c and the lead-out port 7c. Circular projecting parts 13 and 14 for brazing of which the inner circumferential surfaces in the fore end parts are shaped like tapers widening toward the fore end sides so that they correspond to the outer circumferential surfaces of the taper parts of the insertion parts 7b and 8b, are formed at circumferential edges of the openings on the heat exchanger body 1 side in the through holes 2a and 2b of the joint.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated heat exchanger mainly used as an evaporator of an automotive air conditioner.

[0002]

2. Description of the Related Art FIG. 6 shows a block joint for connection to an inlet / outlet piping pipe in a conventional laminated heat exchanger.
The enlarged cross section of the joint between (21) and the heat exchanger body (20) is shown.

[0003] Outward insertion portions (20c) (20d) are provided on the periphery of the fluid outlet (20a) and the fluid inlet (20b) of the heat exchanger body (20).
However, flat portions (20e) and (20f) are formed on the outside of each of them.

[0004] The block joint (21) has a heat exchanger body
Two through holes (21a) (21b) communicating with the fluid outlet (20a) and the fluid inlet (20b) of (20) are formed. Each through hole
Annular brazing projections (21c) and (21d) are formed on the periphery of the opening on the heat exchanger body (20) side of (21a) and (21b).

[0005] Then, the distal end surfaces of the annular projections (21c) (21d) are brazed to the flat portions (20e) (20f), and the connection block joint (21) is attached to the heat exchanger body (20). I have.

[0006]

[0004] Automakers have demanded a reduction in the size of the heat exchanger, and in the above-mentioned conventional laminated heat exchanger, the heat exchanger body has become thinner. Even if the heat exchanger body is made thin, the heat exchanger body
In order to secure sufficient opening areas of the fluid outlet (20a) and the fluid inlet (20b) so as not to cause problems such as an increase in pressure loss and a decrease in cooling efficiency of (20), the insertion portion ( 20c) (20d)
It is necessary to reduce the area of the flat portions (20e) and (20f) at the outer edges of the.

However, the flat portions (20e) and (20f) are brazing surfaces between the connection block joint (21) and the heat exchanger body (20). There are problems that the brazing strength with the heat exchanger body (20) is low and that brazing failure is likely to occur.

An object of the present invention is to be able to braze the connection block joint and the heat exchanger body with sufficient strength irrespective of the size of the width of the heat exchanger body, and to obtain a fluid outlet and a fluid inlet. It is an object of the present invention to provide a laminated heat exchanger that does not cause an increase in pressure loss or a decrease in cooling efficiency.

[0009]

In order to solve the above-mentioned problems, a laminated heat exchanger according to the present invention is provided with a fluid introduction passage and a fluid exit passage therein, and a fluid introduction port and a fluid exit port are arranged side by side. A stacked heat exchanger body having an open end plate, and a connection block joint having two through holes communicating with the fluid inlet and the fluid outlet are provided, and on each periphery of the fluid inlet and the fluid outlet, An insertion portion having a tapered portion narrowing toward the distal end side is formed in a projecting shape, and the inner peripheral surface of the distal end portion has an insertion portion at the periphery of the heat exchanger body side opening in each through hole of the connection block joint. An annular projection for brazing is formed in a tapered shape that widens toward the distal end so as to correspond to the outer peripheral surface of the tapered portion, and the insertion portion is tapered with the annular projection fitted and covered. Outer peripheral surface and annular protrusion In which the tapered tip inner peripheral surface and the brazing has been connected block joint to the heat exchanger body is made to be mounted.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A laminated heat exchanger according to the present invention will be described below with reference to FIGS. FIG. 1 is a schematic perspective view of a laminated heat exchanger according to an embodiment of the present invention.

In the following description, the front and rear are based on FIG. 1, and the side where the wind enters in FIG. 1 is referred to as the front, the side where the wind exits is the rear, and the right side in FIG. That. Note that left and right in the direction of wind flow are referred to as left and right as right and left respectively.

As shown in FIG. 1, the laminated heat exchanger comprises:
A heat exchanger body (1) and a connection block joint (2) are provided.

The heat exchanger body (1) includes a flow passage forming recess (3b) provided in a front-rear side and a header forming recess (3a) provided at both ends of the flow passage forming recess (3b). And a number of intermediate plates (3) having, and a side plate (5) adjacent to the leftmost and rightmost intermediate plate (3), and an end plate (4) adjacent to the left side plate (5). It has. The intermediate plates (3) are alternately stacked with the orientation of the recesses (3a) and (3b) changed, and the fluid passage is formed by the corresponding flow passage forming recess (3b), and the header portion is formed by the opposed header forming recess (3a). Are formed. The flow path formed by the facing flow path forming recesses (3b) has inner fins.
(9) is included.

[0014] Between adjacent intermediate plates (3),
A louvered corrugated fin (6) is interposed. Corrugated fins with louvers (6) are also interposed between the end plates (4) and the side plates (5) and between the intermediate plate (3) and the side plates (5). The internal configuration of the heat exchanger body (1) is publicly known, and a detailed description of the internal configuration will be omitted.

The left end plate (4) is formed with hollow projections (7) and (8) which extend upward from substantially the center of the height in parallel and protrude. The inside of (8) is a fluid outlet path (7a) and a fluid inlet path (8a). A fluid outlet (7c) and a fluid inlet (8c) are formed at the lower ends of the fluid outlet (7a) and the fluid inlet (8a) in parallel in the horizontal direction, respectively. And a substantially cylindrical insertion portion (7b) protruding leftward from the protrusions (7) (8) at the periphery of both entrances (7c) (8c).
(8b) is formed. From the center in the left-right direction of the insertion portions (7b) (8b), from the left to the right end, from the left to the right end, that is, the tapered portion whose diameter narrows toward the left side, that is, toward the tip end of the insertion portions (7b) (8b). (7d) and (8d) are formed.

The connection block joint (2) is connected to the fluid inlet (8c) of the end plate (4) of the laminated heat exchanger body (1).
And a through hole (2a) communicating with the fluid outlet (7c). The annular protrusions (11) and (12) for connection are formed on the left opening edges of the through holes (2a) and (2b), and the annular protrusions (13) and (14) for brazing are formed on the right opening edges. . The connecting annular protrusions (11) and (12) have annular grooves (17) and (18) for fitting the O-ring (16).

Each of the brazing annular protrusions (13) and (14) is fitted over the insertion portions (7b) and (8b) of the heat exchanger body (1). The inner peripheral surface at the distal end of (14) has a larger diameter toward the distal end so as to conform to the inclination of the outer peripheral surface of the tapered portions (7d) (8d) of the insertion portions (7b) (8b) to be fitted and covered. It is tapered. FIG. 5 shows the annular projection (1
The inner peripheral surface of the tapered tip portion of 3) is indicated by reference numeral (13a).

In the laminated heat exchanger constructed as described above, the inner peripheral surface (13) of the tapered tip portion of the rear annular projection (13) is formed.
a) and the outer peripheral surface of the tapered portion (7d) of the insertion portion (7b) of the fluid outlet (7c) are in contact with the inner peripheral surface of the front end of the front annular projection (14) and the fluid inlet (8).
The outer peripheral surface of the tapered portion (8d) of the insertion portion (8b) of (c) is brazed, and the connection block joint (2) is attached to the laminated heat exchanger body (1).

Although not shown, the pipe is fitted and attached to the connecting annular projections (11) and (12). Also,
In some cases, the connection annular protrusions (11) and (12) may be fitted with a fluid inlet and a fluid outlet of a block-shaped expansion valve.

In this heat exchanger, for example, the curvature indicated by R in FIGS. 4 and 5 can be made larger than that of the conventional one, and the flow paths near the fluid inlet (8c) and the fluid outlet (7c) can be obtained. Since the cross-sectional area does not change abruptly, the decrease in pressure loss is minimized.

The annular projections (13) and (14) and the insertion portions (7b) and (8b)
Between them, a large fillet (f) is formed near the tip of the annular projections (13) (14), so that the brazing strength increases.

The components of the heat exchanger body (1) and the connection block joint (2) are not limited to those in the above embodiment, but can be changed as appropriate.

[0023]

According to this laminated heat exchanger, the area of the brazing surface between the heat exchanger body and the connection block joint is increased, and the brazing strength is increased.

Further, even if the heat exchanger body is thinned, a sufficient brazing area is ensured while maintaining the opening areas of the fluid inlet and the fluid outlet at the same size as the conventional heat exchanger. Therefore, problems such as an increase in pressure loss of the heat exchanger body and a decrease in cooling efficiency do not occur.

[Brief description of the drawings]

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

FIG. 2 is an exploded perspective view of a main body of the heat exchanger.

FIG. 3 is an enlarged view of a main part of FIG. 2;

FIG. 4 is an enlarged sectional view of a main part of the heat exchanger.

FIG. 5 is an enlarged view of a main part of FIG.

FIG. 6 is a diagram corresponding to FIG. 4 in a conventional laminated heat exchanger.

[Explanation of symbols]

 (1) Stacked heat exchanger body (2) Block joint for connection (2a) (2b) Through hole (4) End plate (7b) (8b) Insertion part (7c) Fluid outlet (7d) Taper part ( 8c) Fluid inlet (8d) Taper (13) (14) Brazing annular protrusion (13a) Tapered tip inner peripheral surface

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3L065 FA10 FA11 3L103 AA05 AA11 AA17 AA37 BB38 CC23 CC28 DD12 DD54 DD56 DD67

Claims (1)

[Claims] 1. A laminated heat exchanger body having a fluid introduction passage and a fluid outlet passage provided therein and having an end plate having a fluid inlet and a fluid outlet opened side by side, a fluid inlet and a fluid outlet. A connection block joint having two through holes communicating with the fluid inlet port and the fluid outlet port. The peripheral edge of the heat exchanger body side opening in each through hole of the connection block joint is formed in a tapered shape in which the inner peripheral surface of the distal end becomes wider toward the distal end side so as to correspond to the outer peripheral surface of the tapered portion of the insertion portion. An annular projection for brazing is formed, and the outer peripheral surface of the tapered portion of the insertion portion and the inner peripheral surface of the tapered tip portion of the annular projection are brazed while the annular projection is fitted over the insertion portion. Connection blower on the exchange body Stacked heat exchanger to which a lock joint is attached.