JPH05180592A - Heat exchanger - Google Patents

Abstract

PURPOSE:To highly stabilize brazing quality of a connecting part of a connecting tube to a header by inserting to dispose a base end of the tube into an insertion cylinder of a trapezoidal member, and integrally connecting the header to the member and the member to the tube by brazing. CONSTITUTION:A trapezoidal member 5 having an insertion cylinder 5a to be inserted into a connecting hole 3e of a header 3 and a collar 5b provided integrally with the cylinder 5a to radially protrude and formed at its inner surface in shape along the outer periphery of the header 3 is inserted at its cylinder 5a into the hole 3e of the header 3. The collar 5b is disposed on the header 3 in a state to be disposed along the entire periphery of the hole 3e on the outer periphery of the header 3. A base end 4a of a connecting tube 4 for an inlet or an outlet of heat exchanging medium is inserted to be disposed into the cylinder 5a of the member 5 in a fitting state, the header 3 is integrally connected to the member 5 and the member 5 is integrally connected to the tube 4 by brazing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger made of metal such as aluminum used for a condenser for car coolers, a heat exchanger for room air conditioners and the like.

[0002]

2. Description of the Related Art For example, as a condenser for a car cooler,
Recently, as shown in FIG. 3, both ends of a plurality of tubes (1) are connected to a pair of hollow headers (3) (3) in a communicating state, and a gap between the tubes (1). Has a basic structure in which the fins (2) are arranged in the inside, and the internal circulation of the refrigerant through the connection pipes (4) (10) for the refrigerant inlet and outlet, which are connected to the headers (3) (3) for communication. The so-called multi-flow type heat exchanger, in which the above-mentioned method is used, tends to be preferably used because it can realize high heat exchange efficiency, low pressure loss and ultra compactness.

This heat exchanger is generally composed of the above-mentioned tubes (1), headers (3), fins (2), inlet pipes (4), outlet pipes (10) and the like. It is said that the heat exchanger assembly is manufactured by combining the members in a mutually temporarily assembled state, and these heat exchanger constituent members are joined and integrated by collective brazing in a furnace.

By the way, as shown in FIG. 7, conventionally, as a header (53), the aluminum brazing sheet is rolled into a pipe shape as a connecting structure of the inlet pipe (54) to the header (53), and its side edge is rolled. Using a header pipe (53a) whose parts are in a butted state, the base end part of the inlet pipe (54) is inserted and arranged in a connection hole (53e) formed in a manner of traversing the butted part (53d). A structure may be adopted in which the inlet pipe (54) and the header (53), including the butted portion (53d) of the header (53), are joined and integrated by brazing in the arranged state.

[0005]

However, in the connection structure as described above, it is generally difficult to ensure the accuracy of the connection hole (53e) formed in the header (53), and therefore the quality of the joint is high. There was a problem that it was difficult to braze stably.

In particular, as described above, as the header (53), a metal sheet material is rolled into a pipe shape and the side edges thereof are butted against each other.
When the connection hole (53e) is formed in such a manner that the connection hole (53e) is crossed, the accuracy of the connection hole (53e) tends to be even worse, and the brazing between the inlet pipe (54) and the header (53) is likely to occur. May have a relatively high risk of causing quality problems.

In view of the above-mentioned conventional problems, the present invention is of good quality regardless of the accuracy of the connection hole formed in the header of the connection pipe for the heat exchange medium inlet and / or the outlet. An object is to provide a heat exchanger having a structure that can be stably brazed to a header.

[0008]

To achieve the above object, the present invention has a hollow header in which the ends of a plurality of tubes are connected in a communicating state, and the header is for a heat exchange medium inlet and / or outlet. In the heat exchanger provided with the connection hole, the insertion cylindrical portion to be inserted into the connection hole, and the insertion cylindrical portion integrally provided with the insertion cylindrical portion to project outward in the radial direction, and the inner surface thereof is the outer peripheral surface of the header. A pedestal member having a flange portion formed in a shape along with, while inserting the insertion cylinder portion into the connection hole of the header, the flange portion along the outer peripheral surface of the header along the entire circumference of the connection hole. Is arranged in the header in a state, and the base end portion of the connection pipe for heat exchange medium inlet or outlet is inserted and arranged in a fitting state in the insertion cylinder portion of the pedestal member, and in that state, the header and the pedestal member, and The pedestal member and the connecting pipe are And gist heat exchanger characterized by comprising integrally joined by Rero with.

[0009]

In the heat exchanger having the above structure, since the pedestal member having the specific structure is used for joining the header and the connecting pipe, the header and the pedestal member, and the pedestal member and the connecting pipe are stable. And brazed in good quality.

That is, the header and the pedestal member are brazed in such a manner that the pedestal member has a collar portion and the collar portion is arranged along the entire circumference of the connection hole on the outer peripheral surface of the header. As a result, high quality and stable brazing is achieved.

The pedestal member and the connecting pipe have a pedestal member having an insertion tube portion, and the insertion tube portion is inserted into the connection hole of the header. The insertion tube portion has a hole for connecting the connection tube. Since the hole for inserting the connecting pipe is substantially improved, the connecting pipe is stably brazed to this pedestal member with good quality.

Therefore, the quality of the joint between the header and the connecting pipe becomes very high.

[0013]

EXAMPLES Next, examples in which the present invention is applied to a multi-flow type aluminum condenser for a car cooler will be described. It is needless to say that the present invention can be widely applied to heat exchangers for various uses such as heat exchangers for room air conditioners and oil coolers.

In the condenser shown in FIG. 3, (1)
Is a flat tube, and (2) is a corrugated fin, which are arranged in parallel in the vertical direction. (3)
(3) is a pair of left and right headers, which are connected to both ends of the flat tube (1) in a communicating state. Further, (4) is a refrigerant inlet connection pipe (hereinafter referred to as an inlet pipe), and (5) is a pedestal member. In addition, (8) is a partition member, and the header (3) is arranged so that the refrigerant circulates in the tube (1) group in a meandering manner.
(3) The inside is partitioned at a predetermined height position. (9) (9) are side plates, which are arranged on the outer sides of the upper and lower outermost corrugated fins to protect them. Reference numeral (10) is a refrigerant outlet connection pipe (hereinafter referred to as an outlet pipe).

In each of the above heat exchanger constituent members, the flat tube (1) is made of an aluminum extruded mold material, and the inside is divided into a plurality of chambers by partition walls to improve heat transfer performance and pressure resistance performance. It is a so-called harmonica tube. In addition, an electric resistance welded pipe or the like may be used regardless of the extrusion mold material.

The corrugated fin (2) is a corrugated sheet material having a width approximately the same as the width of the tube (1) and cut and raised louvers. Aluminum brazing clad with brazing material is used as the sheet material. Sheets are used.

The headers (3) and (3) are formed by bending one aluminum brazing sheet having a brazing material layer clad on the outer surface or both surfaces thereof, as shown in FIG. The upper and lower end openings of the cylindrical header pipe (3a) in the form of a pipe are closed by an aluminum header cap (3b) in an externally fitted state. An electric resistance welded pipe, an extruded pipe, or the like may be used as the header pipe (3a).

This header (3) has a tube (1)
A tube insertion hole (3c) for inserting the end portion of the side is arranged in a row on the side opposite to the side edge butting portion (3d), and at a predetermined height position, traverses the side edge butting portion (3d). In, a circular refrigerant inflow hole (3e) for inflowing the refrigerant into the header (3) is provided.

This connection hole (3e) is provided with a header pipe (3
Due to the manufacturing reasons in a), semi-circular cutouts should be formed on each side edge of the sheet before it is formed into a pipe, and the sheet is cut into both sides when formed into a pipe. A circular hole is formed by combining the cutouts. Therefore, there is a risk that the connection hole (3e) of the header (3) of this type may have a deviation in accuracy, for example, the connection hole (3e) may be slightly elliptical.

The inlet pipe (4) is made of an extruded material made of aluminum, and a flange portion (4a) formed by beading is formed at a base end portion of the inlet pipe (4) so as to project radially outward. ing. As the inlet pipe (4), an aluminum brazing filler metal clad pipe having a brazing filler metal layer clad on its outer surface, for example, an electric resistance welded pipe made of an aluminum brazing sheet may be used.

The pedestal member (5) is made of a press-molded product of an aluminum brazing sheet having brazing material layers clatted on both sides. As shown in FIGS. An insertion cylinder part (5a) to be inserted into the connection hole (3e) and a flange part (5b) protruding outward in the radial direction are integrally formed with the base end part of the insertion cylinder part (5a). ing.

The outer diameter of the insertion tube portion (5a) is such that the insertion is not supported even if the accuracy of the header connection hole (3e) is relatively large, for example, the diameter of the header connection hole (3e). It is preferable to set the diameter approximately the same as or slightly smaller than the diameter. Also, the same insertion tube (5a)
The inner diameter of is substantially set to the outer diameter of the proximal end portion of the inlet pipe (4). The tubular portion (5a) is a pedestal member (5).
Is manufactured by press molding, so that the inner diameter thereof is molded with high precision as designed. Furthermore, the length of the insertion tube portion (5a) is such that the tip of the insertion tube portion (5a) is completely protruded inward of the header connection hole (3e),
Moreover, the tip end of the inlet pipe (4) is set in a range in which the base end portion of the inlet pipe (4) is inserted into the tubular portion (5a) and protrudes from the tip end opening of the tubular portion (5a).

The collar portion (5b) has a circular outer periphery and is formed to have a diameter larger than that of the header connection hole (3e). Then, the flange portion (5b) is formed into a curved shape along the outer peripheral surface of the header (3), and the flange portion (5b) is inserted into the header connection hole (3e) with the insertion tube portion (5a) inserted. Is formed so as to be along the outer circumferential surface of the header (3) along the entire circumference of the connection hole (3e).

In this embodiment, the same pedestal member (5) is used for connecting the outlet pipe (10).

In the manufacture of the heat exchanger, first, the heat exchanger constituent members are assembled in a temporarily assembled state. That is, a plurality of flat tubes (1) are arranged in parallel at predetermined intervals, the headers (3) and (3) are inserted into both ends of the flat tubes (1), and the ends of the tubes (1) are inserted into the tube insertion holes (3c). By doing so, it is fitted and the corrugated fins (2) are inserted and arranged between the tubes (1). In addition, the partition member (8), the side plates (9) (9), etc. are assembled.

At the same time, the inlet pipe (4) is assembled. That is, as shown in FIG. 2, the insertion tube portion (5a) of the pedestal member (5) is inserted into the connection hole (3e) of the header (3),
The inner surface of the flange portion (5b) is brought into contact with the outer peripheral surface of the header (3) so as to be along the outer surface. Thereby, the base member (3) is
Regardless of the accuracy of the connection hole (3e) of the header (3), it is assembled to the header (3) in a stable and proper state suitable for brazing. And in tandem with this, the inlet pipe (4)
The base end of the base member (5) of the pedestal member (5) hole (5c)
It is inserted inside, and the collar portion (4a) of the inlet pipe (4) is brought into contact with the collar portion (5b) of the pedestal member (5). The base end portion of the inlet pipe (4) is inserted and arranged in a proper state fitted in the tubular portion (5a) because the hole (5c) of the insertion tubular portion (5a) has very high accuracy. It In this inserted arrangement state, the tip of the proximal end portion of the inlet pipe (5) projects from the insertion tubular portion (5a) of the pedestal member (5). The same applies to the outlet pipe (10). The heat exchanger assembly is manufactured as described above.

Then, this heat exchanger assembly is put in a furnace, flux brazing or vacuum brazing is performed, and the whole including the abutting portion (3d) of the header (3) is integrally joined. By this brazing, as shown in FIG. 1, the flange portion (5a) of the pedestal member (5) secures a wide brazing area over the entire circumference of the peripheral surface of the connection hole (3d) to ensure good quality and stability. Joined and integrated. At the same time, the insertion tube portion (5a) of the pedestal member (5) and the base end portion of the inlet pipe (4) are similarly brazed and integrated with good quality.
In particular, the tip end of the proximal end portion of the inlet pipe (4) is arranged so as to be projected from the tip end of the insertion tubular portion (5a) of the pedestal member (5), so that the fillet (13) is formed. The brazed state that has caused is realized, and a stable brazed state with higher quality is realized. It should be noted that the brazing state in which the fillet is generated may be realized by the configuration in which the distal end of the proximal end portion of the inlet pipe (4) is retracted inward of the insertion tube portion. As a result, the inlet pipe (4) and the outlet pipe (10) are manufactured into a heat exchanger in which the header (3) is stably brazed with good quality.

The embodiment shown in FIG. 4 has an inlet pipe (4).
The stepped portion (4c) is formed by reducing the diameter of the base end of the stepped portion (4c), and the stepped portion (4c) is brought into contact with the flange portion (5b) of the pedestal member (5).

Further, in the embodiment shown in FIGS. 5 and 6, the outer peripheral shape of the flange portion (5b) of the pedestal member (5) is variously changed in consideration of workability and the like.

In the above embodiment, the joining structure of the present invention is applied to both the inlet pipe (4) and the outlet pipe (10), but only the inlet pipe (4) or the outlet pipe ( Ten)
The joining structure of the present invention may be applied only to this.

In the above embodiment, the connection hole (3e) is
The header (3) is provided so as to traverse the abutting portion (3d), but may be provided so as not to traverse the abutting portion (3d). According to a header of a type that is perforated into a sheet before forming and is then formed into a pipe shape, the connection hole (3e) may eventually have an elliptical shape, in which case the structure of the present invention is effective for that. Can deal with. Also,
The header is not limited to the butt pipe type as described above, but may be a type of header in which a connection hole is formed in a tubular body such as an extruded pipe. Such a connection hole also has a certain limit in accuracy improvement due to processing limitations, and can be effectively dealt with by applying the present invention.

[0032]

As described above, the heat exchanger of the present invention is
Using a pedestal member of a specific structure, in a state in which the flange portion is along the entire circumference of the connection hole of the header outer peripheral surface, since the pedestal member and the header are joined and integrated by brazing, The pedestal member and the header are brazed to each other with good quality and stability, and moreover, the insertion tube portion of the pedestal member is inserted into the connection hole of the header, the hole of the tube portion is replaced with the connection hole of the header, and the insertion tube is inserted. Since the base end portion of the connecting pipe is inserted into the hole of the portion and the connecting pipe and the base member are joined and integrated by brazing, the connecting pipe and the base member are stably brazed with good quality. To be done. Therefore, the brazing quality of the joint between the connecting pipe and the header can be made high and stable regardless of the accuracy of the connecting hole of the header.

[Brief description of drawings]

FIG. 1A is a perspective view showing a joint portion between a header and a refrigerant inlet pipe, FIG. 1B is a vertical sectional view of the header showing the joint portion, and FIG. 1C is a transverse sectional view thereof.

FIG. 2 is a perspective view showing a header, a base member, and an inlet pipe in a separated state.

3A and 3B show the entire configuration of a heat exchanger, wherein FIG. 3A is a front view and FIG. 3B is a plan view.

FIG. 4 shows a modified example, in which FIG. 4A is a vertical sectional view of the header showing a joint portion between the inlet pipe and the header, and FIG. 4B is a horizontal sectional view thereof.

5A and 5B show another modified example, in which FIG. 5A is a cross-sectional view of the joint portion when the pedestal member is viewed from the front, and FIG. 5B is a cross-sectional view taken along line VV of FIG. 5A. is there.

6A and 6B show still another modified example, in which FIG. 6A is a cross-sectional view of the joint portion when the pedestal member is viewed from the front, and FIG. 6B is a cross-sectional view taken along line VI-VI of FIG. Is.

7A and 7B show a conventional joint structure, in which FIG. 7A is a perspective view showing an inlet pipe and a header in a separated state, and FIG. 7B is a transverse cross-sectional view of a header.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Tube 3 ... Header 3e ... Connection hole 4 ... Inlet pipe (heat exchange medium inlet connection pipe) 5 ... Pedestal member 5a ... Insertion cylinder part 5b ... Collar part

Claims (1)

[Claims] 1. A heat exchanger having a hollow header in which ends of a plurality of tubes are connected in a communicating state, and the header is provided with a connection hole for heat exchange medium inlet and / or outlet, It has an insertion cylinder part to be inserted into the connection hole, and a flange part which is integrally provided in the insertion cylinder part and protrudes outward in the radial direction, and the inner surface of which is formed in a shape along the outer peripheral surface of the header. The pedestal member is arranged in the header in a state in which the insertion cylinder portion is inserted into the connection hole of the header and the flange portion is provided on the outer peripheral surface of the header along the entire circumference of the connection hole, and the pedestal member The base end of the heat exchange medium inlet or outlet connection pipe is inserted and arranged in the insertion tube portion in a conforming state, and in that state, the header and the base member, and the base member and the connection pipe are joined by brazing. To be integrated Heat exchanger and butterflies.