JP2539511Y2 - Heat exchanger - Google Patents

Description

TECHNICAL FIELD The present invention relates to a heat exchanger made of metal such as aluminum used for a condenser for a car cooler or the like.

2. Description of the Related Art In recent years, as a condenser for a car cooler, a so-called multiflow type heat exchanger capable of realizing high heat exchange performance and low pressure loss tends to be used.

In this heat exchanger, as shown in FIGS. 4 and 5, a large number of aluminum flat tubes (2) are passed between a pair of left and right headers (1) (1) so as to communicate with each other. (2) The structure is such that an aluminum corrugated fin (3) is arranged between them. In addition, (4) is a refrigerant inlet pipe, (5) is the same outlet pipe, (6) is a side plate for protecting the outermost fin (3), and (7) is a partition plate for flowing the refrigerant in a meandering manner. . The header (1) of this type of heat exchanger generally has a structure in which an end of a cylindrical aluminum header pipe (10) is sealed with an aluminum header cap (11).

By the way, in the above-mentioned header (1), recently, as a header pipe (10), a brazing sheet formed into a pipe shape in a form having a brazed joint along the axial direction in a part of the circumferential direction is used. For example, as shown in FIG. 6, a brazing sheet is formed into a pipe shape, and both side edges (10a) (10a) are brought into a butted state, and the side edges are collectively brazed and used. In order to prevent the butting portion from being opened due to heat generated when the side edges are joined to each other, the header cap (51) is used as a header engaging with the outer peripheral surface of the end portion of the header pipe (10). An outer fitting type having a side wall (51a) is often used.

However, when the header cap (51) is fitted to the end of the header pipe (10),
Alternatively, there is a risk of displacement or falling off from the pipe (10) before or during the brazing after the fitting arrangement.

This is due to the following circumstances. That is, as described above, the peripheral side wall (51a) provided on the header cap (51) is formed by fitting the header cap (51) to the end of the header pipe (10). This is for properly maintaining the butted state of the side edges of (10). Therefore, if the peripheral side wall (51a) is formed so that the outer peripheral surface of the end portion of the header pipe (10) is tightly tightened in order to prevent the cap (51) from falling off, the pipe (10) is shrunk. This causes a radial deformation, which causes a situation in which the appropriate abutting state of the side edges (10a) (10a) is broken. Therefore, the peripheral wall (51a) of the cap (51) is connected to the header pipe (10).
Is formed so as to fit relatively loosely into the pipe (10) so as not to be tightly tightened. Therefore, when the cap (51) is fitted to the end of the pipe (10), there is a risk that the cap (51) may be displaced or fall off as described above.

This invention solves the above-mentioned conventional drawbacks and prevents the cap disposed at the end of the header pipe from being displaced and falling while properly maintaining the abutting state of both side edges of the header pipe. It is an object of the present invention to provide a multi-flow pipe heat exchanger which can be used.

Means for Solving the Problems To achieve the above object, the present invention provides a plurality of tubes arranged in parallel and a pair of headers connected to both ends thereof, wherein the headers are arranged in a circumferential direction. Pipe made of a brazing sheet formed in a pipe-like form having a brazed joint along the axial direction at the portion, and a pipe end sealing and pipe disposed in an externally fitted state at an end of the header pipe In a heat exchanger formed by a header cap for restricting diameter expansion, a pipe diameter reduction in which an outer peripheral side surface is engaged with an inner peripheral surface of an end portion of the header pipe over an entire periphery on an inner surface of a bottom wall of the header cap. A state in which a circular convex portion for regulation is provided, and the peripheral wall of the end portion of the header pipe is sandwiched by the outer peripheral side surface of the circular convex portion and the inner peripheral surface of the cap over the entire circumference from both the inner and outer sides. The gist is that the outer peripheral side surface of the circular convex portion is joined and integrated with the peripheral wall of the header pipe end portion by brazing.

In the above heat exchanger, the header cap is fitted to the end of the header pipe, and clamps the end peripheral wall of the pipe between the peripheral side wall and the circular projection. The capping force prevents the cap from being displaced and falling off. Moreover, since the peripheral side wall of the cap regulates the diameter expansion of the header pipe, and the circular convex part regulates the diameter reduction of the pipe,
Due to the fitting arrangement of the cap, the proper molded state of the header pipe is not broken.

On the other hand, while the heat exchanger is operating, the internal pressure of the header pipe increases, and a force acts to push the header cap in a direction to remove the header cap.In the present invention, however, the outer peripheral side surface of the circular convex portion of the header cap is the header. The header cap is secured to the inner surface of the pipe end by brazing so that the mounting strength against the internal pressure of the pipe is sufficiently secured. , The cap maintains a stable mounting state.

Embodiment An embodiment of the present invention will be described below.

In the embodiment heat exchanger shown in FIGS. 1 to 3, (2) is a tube, (3) is a corrugated fin,
(1) is a header. In the header (1), (10) is a header pipe, and (11) is a header cap.

The header pipe (10) uses an aluminum brazing sheet with brazing material layers clad on both sides of the core material,
Both sides (10a) (10a) of the brazing sheet are formed so as to be abutted to form a circular pipe. In addition, on the side of this header pipe (10),
Insert the tube insertion holes (10
b) is provided.

Then, in the header cap (11), (11a)
Is a peripheral side wall, and (11c) is a circular convex portion.

The inner peripheral shape of the peripheral side wall (11a) is the header pipe (1
It is formed in a shape conforming to the outer peripheral shape of 0).

The circular convex portion (11c) is formed so as to protrude the bottom wall of the cap upward, and is formed so that the outer peripheral shape matches the inner peripheral shape of the header pipe (10).

When the end peripheral wall of the header pipe (10) is fitted and disposed between the peripheral side wall (11a) and the circular convex part (11c), the cap (11) is in contact with the inner surface of the peripheral side wall (11a). The outer peripheral side surface (11b) is dimensioned so that the end peripheral wall is sandwiched between the inner and outer sides over the entire periphery.

First, header pipe (10)
The insertion of the end of the tube (2) into the tube insertion hole (10b), the placement of the corrugated fin (1) between the tubes (2), etc. are performed, and the header cap is attached to the end of the header pipe (10). (11) is fitted and arranged, and the heat exchanger is assembled in a temporary assembly state. Then, the assembly is sent to a vacuum heating furnace or the like, and both side edges (10
a) Brazing joint of (10a), cap side wall (11
a) and components of the heat exchanger such as brazing between the ends of the pipe (10), brazing between the outer peripheral side surface (11b) of the cap projection (11c) and the inner peripheral surface of the end of the pipe (10), etc. This is accomplished by performing brazing joints between the members at once.

By using the header cap (11) having the above configuration, the cap (11) can be connected to the header pipe (1).
In the temporary assembly state in which the cap (11) is fitted and arranged at the end of the cap (11), the peripheral side wall (11a) and the circular convex portion (11c) are formed as shown in FIGS. Since the end peripheral wall of the header pipe (10) is sandwiched from both the inside and outside directions, the header pipe (10) is displaced with respect to the header pipe (10).
It does not fall off from the pipe (10). Moreover, in this pinched state, the peripheral wall (11a) of the cap (11)
Regulates the diameter expansion behavior of the pipe (10) due to the circular projection (11c) and the circular projection (11c) acts to regulate the diameter reduction behavior. The diameter of the pipe (10) changes and both side edges (10
There is no inconvenience that the appropriate abutting state of a) is destroyed.

Further, in this embodiment, since the outer peripheral side surface (11b) of the circular convex portion of the header cap (11) is joined and integrated with the inner peripheral surface of the end peripheral wall of the header pipe (10),
The header cap (11) can sufficiently secure the mounting strength against the internal pressure of the pipe (10). Therefore, for example, when the heat exchanger is operating, the header pipe (1
Even if the internal pressure of 0) rises and the header cap (11) is pushed in the removal direction by the pressure, the header cap (11) maintains a stable mounting state, and the cap (11) is removed from the pipe (10). A defect such as detachment can be reliably prevented.

Effect of the Invention As described above, the multi-flow heat exchanger of the invention is
On the inner surface of the bottom wall of the outer fitting type header cap, there is provided a circular convex portion for reducing the diameter of the pipe, which is engaged with the inner peripheral surface of the end portion of the header pipe over the entire circumference. Since the peripheral wall of the end portion of the header pipe is sandwiched between the inner side and the outer side over the entire circumference by the side wall, the cap is firmly held on the header pipe by the clamping force of the peripheral side wall and the circular projection. It is possible to reliably prevent the cap from shifting or falling off.

Moreover, since the peripheral side wall of the cap regulates the diameter expansion of the header pipe and the circular projection regulates the diameter reduction of the pipe, the diameter of the header pipe is not changed, that is,
As a header pipe, the cap can be prevented from being displaced or falling off while effectively maintaining a proper molding state.

In addition, since the outer peripheral side surface of the circular convex portion of the header cap is joined and integrated by brazing to the inner peripheral surface of the peripheral end portion of the header pipe, the header cap can sufficiently secure the mounting strength against the internal pressure of the pipe, for example, heat exchange. Even if the internal pressure of the header pipe rises during operation of the vessel and the header cap is pushed in the removal direction due to the pressure, the cap is maintained in a stable mounting state and it is possible to prevent problems such as removal of the cap. it can.

[Brief description of the drawings]

1 to 3 show an embodiment of the heat exchanger of the present invention. FIG. 1 is a perspective view showing a header pipe and a header cap in a separated state, and FIG. 2 is an end of the header pipe. FIG. 3 is a cross-sectional view taken along line III-III of FIG. FIG. 4 is a front view showing the overall configuration of the multi-flow heat exchanger, and FIG. 5 is a plan view of the same. FIG. 6 is a perspective view showing a conventional heat exchanger in which a header pipe and a header cap are separated. (1) ... header, (2) ... tube, (10) ...
Header pipe, (10a) ... side edge, (11) ... header cap, (11a) ... peripheral side wall, (11b) ... outer peripheral side surface, (11c) ... circular convex part.

Claims (1)

(57) [Scope of request for utility model registration] 1. A plurality of tubes arranged in parallel,
A header pipe comprising a pair of headers connected at both ends thereof, the header comprising a brazing sheet formed in a pipe-like form in which the header has a brazing joint along the axial direction in a part of the circumferential direction. And a header cap for pipe end sealing and pipe diameter expansion regulation arranged in an externally fitted state at an end of the header pipe, wherein an inner periphery of a bottom wall of the header cap has an outer periphery. A side surface is provided with a circular convex portion for restricting the diameter of the pipe to be engaged with the inner peripheral surface of the end portion of the header pipe over the entire circumference. The outer peripheral side surface of the circular convex portion is joined and integrated by brazing to the inner peripheral surface of the end portion of the header pipe in a state where the peripheral wall of the portion is sandwiched from both the inner and outer sides over the entire periphery. Heat exchanger characterized by comprising.