JPH0719654Y2 - Heat exchanger - Google Patents

Description

TECHNICAL FIELD The present invention relates to a heat exchanger used in, for example, a condenser for a car cooler.

2. Description of the Related Art Recently, as a heat exchanger of this kind, a plurality of tubes and fins are alternately arranged, and both ends of each tube are connected to a pair of hollow headers, and a heat exchange medium inlet joint and an outlet A so-called header type heat exchanger in which a joint and a header are provided has been highly praised for its compactness, light weight and the like, and has been in the limelight.

By the way, as a header which is a constituent member of this header type heat exchanger, a brazing sheet in which a brazing material layer is clad on one side or both sides of a core material is formed into a pipe shape with its both side edges abutting each other. , A so-called electric resistance welded pipe in which the butted portion was electric resistance welded was used. By using the header pipe having such a structure, the pipe, the tube, and other heat exchanger constituent members are vacuum brazed or flux brazed.

However, in the above-mentioned electric resistance welded pipe header,
Since the brazing sheet is formed into a pipe shape and then welding for closing the abutting portions is separately required, the manufacturing process of the heat exchanger becomes complicated.

In view of the conventional problems described above, the present invention has a tubular hollow body having a butting portion extending in the length direction, which is formed by a brazing sheet having a brazing material layer clad on one or both sides of a core material as a header. An object of the present invention is to provide a heat exchanger in which a molded pipe is used, which can simplify the manufacturing process of the heat exchanger by eliminating the electric resistance welding process of the butted portion of the pipe. To do.

Means for Solving the Problems In order to achieve the above object, the present invention has a structure in which a plurality of tubes and fins are alternately arranged and both ends of each tube are connected to a pair of hollow headers. A heat exchanger provided with a heat exchange medium inlet joint and the same outlet joint, wherein the header is a brazing sheet in which a brazing material layer is clad on one surface or both surfaces of a core material and extends in the longitudinal direction. It is composed of a tubular hollow molded pipe having an abutting portion, and the inlet joint and / or the outlet joint is provided with a fitting hole for preventing the abutting portion opening which is continuous to the internal flow passage thereof, The end of the hollow molded pipe is fitted into the fitting hole, and the abutting portion of the hollow molded pipe, the pipe and the joint, and the pipe and the tube are connected to each other by the brazing sheath. The gist of the present invention is a heat exchanger characterized by being integrally joined by batch brazing of a brazing filler metal.

Action In the above-mentioned configuration, the header is made of a brazing sheet in which a brazing material layer is clad on one side or both sides of a core material, and is composed of a tubular hollow molded pipe having an abutting portion extending in the length direction, and the hollow molded pipe is The abutting portion has a structure in which the brazing material of the brazing sheet is joined by collective brazing, so that the abutting portion of the pipe is collectively brazed together when brazing the pipe and the tube, Therefore, the process of electric resistance welding of the abutting portion of the pipe is eliminated, and the manufacturing process of the heat exchanger is simplified.

In addition, the inlet joint and / or the outlet joint is provided with a fitting hole that is continuous with the internal flow passage for preventing the abutting portion from opening, and the end portion of the hollow molded pipe is located in the fitting hole. The abutting part of the hollow molded pipe and the abutting part of the hollow molded pipe are joined and integrated by collective brazing of the brazing sheet with the brazing material of the brazing sheet. At the time of attaching, the joint fitted to the end of the pipe prevents the abutting portion from opening due to the action of heat during brazing, and brings the abutting portion into an appropriate butting state. Hold, and thus the abutting portions of the pipes are properly joined with the brazing material of the brazing sheet.

In addition, since the joint fitted to the end of the pipe is configured to prevent the abutting portion of the pipe from opening during brazing, a special treatment for preventing the abutting portion of the pipe from opening is provided. No need to use tools,
The heat exchanger manufacturing work associated with the attachment / detachment of the jig is not complicated, and the cover material at the end of the pipe is also reduced, so that the number of heat exchanger components is reduced.

Example Hereinafter, an example in which the heat exchanger of the present invention is configured as a condenser for a car cooler will be described.

3 and 4, (1) is a plurality of tubes vertically arranged in a horizontal state, (2) ... Is a corrugated fin interposed between adjacent tubes (1).
(3) and (4) are a pair of left and right hollow headers that are connected to both ends of the tubes (1) in a communicating state, and (5) is a flow passage formed by the tubes (1). It is a partition plate that partitions the inside of the headers (3) and (4) so as to be distributed. And, (6) is a joint for the inlet of the heat exchange medium,
(7) is a joint for the outlet. In this condenser, the gaseous refrigerant flowing into the header (3) through the inlet joint (6) flows meanderingly through the tubes (1) ... While the corrugated fins (2) are arranged in the tubes. It is liquefied by exchanging heat with the air flowing through the gap between (1) and flows out to the outside of the heat exchanger through the outlet joint (7).

The above-mentioned tubes (1) are composed of a flat extruded mold material made of an aluminum material, and a porous type so-called harmonica tube is preferably used. As the tubes (1), an electric resistance welded pipe may be used regardless of the extruded mold material.

The corrugated fins (2) ... Are made of an aluminum material similarly to the tube, have a width substantially the same as that of the tube (1), and preferably have wall surfaces with louvers cut and raised.

The headers (3) and (4) have a brazing material layer clad on both inner and outer surfaces, and on their side surfaces, there are tube insertion holes (10) for inserting the ends of the tubes (1). Partitioning holes (11) for inserting the partitioning plate (5) are provided at intervals along the partition.

The headers (3) and (4) are composed of a hollow molded pipe (30), and the hollow molded pipe (30) is manufactured as follows. That is, as shown in FIG. 5 and FIG. 6, a brazing material layer (16) made of an Al—Si alloy having a Si content of about 6 to 13 wt% is provided on both surfaces of a core material (15) made of aluminum. A brazing sheet (17) of a predetermined size coated with (7) (16) is prepared, and the brazing sheet (17) is placed at the same position in the longitudinal direction on both side edges of the sheet (17).
Make notches (18) (18) as shown. The cuts (18) (18) form the partition plate insertion hole (11) after the both edges of the brazing sheet (17) are butted against each other. Then, the brazing sheet (1
Hit both side edges (19) (20) of 7) in the thickness direction with a hammer or a press. This striking is performed on the upper surface of one side edge portion (19) and on the lower surface of the other side edge portion (20), so that one side edge portion (19) is moved as shown in FIG. An inclined surface (21) that gradually becomes thinner from the upper edge to the lower edge is formed, and an inclined surface (22) that gradually becomes thinner from the lower edge to the upper edge is formed for the other side edge portion (20). Let it form. As a result, both the inclined surfaces (21) (22) are covered with the brazing material layer (16). Next, as shown in FIG. 9, the central portion in the width direction of the brazing sheet (17) is bulged to have a semicircular arc cross section along the lengthwise direction to form a bulged portion (25). First
As shown in FIG. 10, the tube insertion holes (10) ... Are provided in the bulging portion (25) along the circumferential direction at intervals along the length direction of the bulging portion (25). This punching is performed by pressing with a pressing die having a shape matching the shape of the bulging portion (25) applied from the lower surface side. This is to prevent the bulging portion (25) from being crushed or deformed and to form the tube insertion hole (10) with high dimensional accuracy at an appropriate position. Then, the horizontal portions (26) and (26) on both sides of the brazing sheet (17) excluding the bulging portion (25) are pressed into a brazing sheet (17) having a U-shaped cross section as shown in FIG. 1 and 2 are formed by bending and then forming into a round pipe shape while applying an external force by a press so that both side edges (19) (20) are in a butt shape. And molded into a hollow molded pipe (30).

The inlet joint (6) and the outlet joint (7) are made of a rectangular parallelepiped block body (35) made of aluminum, as shown in FIGS. 1 and 2. The block body (35) is provided with first and second holes (36) (37) on one surface and a surface orthogonal to the surface, and both holes are formed in the block body (35). By communicating with each other, a flow passage (38) for the heat exchange medium is formed. The opening side of the first hole (36) is formed to have a large diameter through the step (39), and the first hole (36) serves as a fitting hole (40) into which the end of the hollow molded pipe (30) is fitted. . Note that (41) is a tubular screw to which external piping is connected.

The heat exchanger inserts both ends of the tubes (1) into the tube insertion holes (10) of the hollow molded pipe (30) forming the headers (3) and (4), and also between adjacent tubes and the outermost tube. The corrugated fins (2) consisting of brazing sheets are arranged on the outside of the, and the upper and lower side pieces (45) (46) are arranged on the outer side of the outermost corrugated fins, and the partition plate is inserted in the partition plate insertion hole (11). (5) is inserted and the outlet joint (7) is fitted to the lower end of the hollow molded pipe (30) constituting one header (4), and the inlet joint (6) is connected to the other header. A cap-shaped lid (47) (4) fitted to the upper end of the hollow molded pipe (3) and at the remaining open end of the hollow molded pipe (30).
By fitting 7) to the external fitting state, the temporary assembly state is obtained.

In this state, the inlet and outlet joints (6) (7)
Is fitted to the end portion of the hollow molded pipe (30) in an externally fitted state, so that the abutting portion of the pipe (30) is prevented from opening. Further, the lid (47) (47) makes the opening prevention state more solid. The heat exchangers in the temporarily assembled state are integrated together by brazing in the furnace or the like. During this brazing, even if the abutting part of the hollow molded pipe (30) is opened by heat, the joints (6) (7)
Such behavior is suppressed by this, and proper bonding is performed while maintaining the shape after molding.

In addition, in the heat exchanger of the above-mentioned embodiment configuration, when the joint is attached to the side surface of the header pipe, it is necessary to close all of the four openings at the end portion of the header with the lid material, while the joint ( Since 6) and (7) are attached to the ends of the headers (3) and (4) instead of the side faces, there is an advantage that the number of constituent members of the heat exchanger can be reduced.

Also, especially when the outlet joint is provided on the side surface of the header, the liquid refrigerant flowing out from the tube into the header at the outlet side stays at the inner bottom of the header, and the liquid surface of the staying refrigerant reaches the joint attachment position. If the temperature does not rise, there is a risk that the refrigerant will not flow out, and therefore the refrigerant containing the gas will be sent to the receiver dryer connected to the downstream side of the condenser.
By attaching the outlet joint (7) to the lower end of the header (4) as described above, the liquid refrigerant flowing out from the tube (1) into the header (4) can be prevented from being entrained in gas. Can be drained towards the receiver dryer.

Note that one of the joints (6) and (7) may be provided at the end of the header and the other may be provided at the side surface of the header.

The joint (6) (7) shown in FIG. 12 has two holes (51) (52) formed in parallel on one surface of a rectangular parallelepiped block body (35), and a surface orthogonal to the surface. Another hole is drilled from
A U-shaped heat exchange medium flow passage is formed by closing the opening of this hole, and the opening side of the one hole (51) is formed to have a large diameter through the step (53). Is a fitting hole (40) that fits with the end of the hollow molded pipe (30), and the other end of the hole (52) has a tubular screw (5) for connecting an external pipe.
3) is projected. Thus, the block body (3
If the joints (6) and (7) are configured by making holes in 5), there is an advantage that the connection portion with the external pipe can be formed in a desired direction in a compact manner.

The joint (6) (7) shown in FIG. 13 is a block body (35) in which a U-shaped heat exchange medium flow passage is formed, like the block body (35) shown in FIG. Although it is configured, only screw holes (55) are formed on the peripheral edge surface of the hole (52).
The difference is that it is formed as (55). That is, the external pipe (56) is formed to have a flange (57) on the outer periphery of the end thereof, and the flange (57) is aligned with the hole (52) of the block body (35).
Fix 7) to the block body (35) with screws (58) (58),
The external pipe (56) is connected to the joints (6) and (7).

Effect of the Invention According to the above, in the heat exchanger of the present invention, the header has a tubular shape having an abutting portion extending in the longitudinal direction by the brazing sheet in which the brazing material layer is clad on one or both sides of the core material. The abutting portion of the hollow molded pipe is a structure in which the abutting portion of the hollow forming pipe is joined by brazing with the brazing material of the brazing sheet, so the abutting portion of the pipe is a brazing of the pipe and the tube. At the same time, they are collectively brazed, so that the step of electric resistance welding the abutted portion of the pipe can be eliminated,
The manufacturing process of the heat exchanger can be simplified.

In addition, the inlet joint and / or the outlet joint is provided with a fitting hole that is continuous with the internal flow passage for preventing the abutting portion from opening, and the end portion of the hollow molded pipe is located in the fitting hole. The abutting part of the hollow molded pipe and the abutting part of the hollow molded pipe are joined and integrated by collective brazing of the brazing sheet with the brazing material of the brazing sheet. When fitting, the joint fitted to the end of the pipe prevents the abutting part from opening due to the action of heat during brazing, and holds the abutting part in an appropriate abutting state. Therefore, the abutting portions of the pipes can be properly joined by the brazing material of the brazing sheet.

In addition, since the joint fitted to the end of the pipe prevents the opening of the abutting portion of the pipe during brazing, a special jig that prevents the opening of the abutting portion of the pipe is used. Therefore, the heat exchanger manufacturing work associated with the attachment / detachment of the jig is not complicated, and the cover material at the end of the pipe is also reduced. Can reduce the score.

[Brief description of drawings]

1 to 11 show an embodiment of the present invention. FIG. 1 is a perspective view showing a header, a heat exchange medium outflow joint and the like in a separated state, and FIG. 2 is a header and a heat exchange medium outflow. FIG. 3 is a front view of the heat exchanger, FIG. 4 is a plan view of the same, and FIGS. 5 to 11 show a manufacturing process of a hollow molded pipe constituting a header. FIG. 5 is a sectional perspective view of a brazing sheet as a material, FIG. 6 is a sectional view taken along the line VI-VI of FIG. 5, FIG. 7 is a sectional perspective view after notch formation, and FIG. 8 is a brazing sheet. Sectional view after striking both side ends of the seat, FIG. 9 is a sectional perspective view after forming the bulging portion, FIG. 10 is a sectional perspective view after drilling a tube insertion hole, and FIG. 11 is a U-shaped section. It is a cross-sectional perspective view after molding into. FIG. 12 is a perspective view showing another example of the joint,
FIG. 13 is a perspective view showing still another example of the joint. (1) ... tube, (2) ... corrugated fin, (3)
(4) ... Header, (6) ... Heat exchange medium inflow joint,
(7) ... heat exchange medium outflow joint, (17) ... brazing sheet, (30) ... hollow molded pipe, (38) ... flow passage,
(40)… Mating hole.

Claims (1)

[Scope of utility model registration request] 1. A plurality of tubes and fins are alternately arranged, both ends of each tube are connected to a pair of hollow headers, and a heat exchange medium inlet joint and an outlet joint are provided in the headers. A heat exchanger provided, wherein the header is made of a tubular hollow molded pipe having an abutting portion extending in a length direction by a brazing sheet in which a brazing material layer is clad on one side or both sides of a core material. Together with the inlet joint and / or the outlet joint, a fitting hole for preventing the abutting portion from opening is provided in the internal flow passage, and the end portion of the hollow molded pipe is provided in the fitting hole. And the abutting portion of the hollow molded pipe, the pipe and the joint, and the pipe and the tube are integrally joined by brazing the brazing sheet with the brazing material. Heat exchanger characterized by comprising been.