JPH0722607Y2 - Heat exchanger - Google Patents

Description

TECHNICAL FIELD The present invention relates to a heat exchanger used in, for example, a car cooler, a room air conditioner condenser, or the like.

2. Description of the Related Art For example, as a heat exchanger used in a condenser as described above, conventionally, a perforated extruded flat tube called a harmonica tube is bent in a meandering shape, and fins are arranged between parallel portions thereof. A so-called serpentine type heat exchanger having a core has been used. However, in such a serpentine heat exchanger, since the passage of the heat exchange medium is formed by one flat extruded tube, a large passage area cannot be secured, and the extruded tube is bent in a meandering shape. Since the radius of curvature of the bent portion cannot be reduced more than a certain amount, the tube pitch cannot be reduced, which reduces the number of fins interposed between the parallel portions of the tube, resulting in poor fin efficiency. There was a limit to the efficiency improvement.

Therefore, as a heat exchanger instead of the serpentine type, a plurality of tubes are arranged in parallel between a pair of hollow headers, both ends of which are communicated and connected to the header, and between adjacent tubes and the outermost tubes. A so-called multi-flow type heat exchanger has been proposed in which corrugated fins are arranged on the outer side, and side plates for protecting the fins are arranged on the outer side of the outermost fins. According to this heat exchanger, since the tube pitch can be freely selected, a large refrigerant passage cross-sectional area can be secured, and the number of fins interposed between the tubes can be increased, which is small and has excellent heat exchange efficiency. You can

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention By the way, in manufacturing this multi-flow heat exchanger, a plurality of tubes are arranged in parallel at predetermined intervals, and both ends of the tubes are inserted into a hollow header. Assemble the header in communication with each other, and arrange the fins between the tubes and outside the outermost tube, and arrange the side plate outside the outermost fin.
Then, bar-shaped jigs are arranged on the outsides of both side plates, and the belt is circulated between the bar-shaped jigs so that the bulging of the core is suppressed and the brazing is performed collectively in that state. It is generally performed by a method in which the whole is bonded and integrated.

However, in the conventional multi-flow heat exchanger, the end portion of the header is generally projected outward in the longitudinal direction of the header rather than the side plate. However, the distance between the headers must also be short, so that the same type of jig cannot be used in the manufacture of many types of heat exchangers with different distances between the headers. It was very inconvenient because a dedicated jig had to be prepared according to the type of exchanger.

In view of the above-mentioned conventional problems, the present invention is used by arranging it outside the side plate during collective brazing in the manufacture of various types of heat exchangers having different gap lengths between headers. As a jig for controlling the bulge of the core,
An object of the present invention is to provide a heat exchanger having a structure in which general-purpose jigs of the same type having the same length can be used and which is advantageous in manufacturing.

MEANS FOR SOLVING THE PROBLEMS Thus, the present invention is directed to a pair of hollow headers arranged in parallel and a plurality of tubes arranged in parallel between the headers and having both ends communicated and connected to the headers. A fin disposed between the adjacent tubes and outside the outermost tube, and a side plate disposed outside the outermost fin, the end portion of the header is the side The end of the side plate is located inward in the longitudinal direction of the header with respect to the position of the plate, and the end of the side plate is located inward in the longitudinal direction of the side plate rather than the position of the header. Does not interfere with the header, and the side plates and fins, fins and tubes, and tubes and headers are integrally brazed together. The gist is a heat exchanger characterized by being made into a material.

Embodiment Next, the configuration of the present invention will be described based on an embodiment applied to a condenser heat exchanger made of aluminum.

In FIGS. 1 to 3, (1) shows a plurality of aluminum tubes vertically arranged in a horizontal state,
(2) is an aluminum corrugated fin interposed between the adjacent tubes (1) and (1). The tube (1) is composed of a flat extruded mold material made of an aluminum material. The tube (1) may be of a so-called harmonica tube of a porous type. Further, an electric resistance welded tube may be used instead of the extruded mold material. The corrugated fin (2) has almost the same width as the tube (1) and is joined to the tube by brazing. The corrugated fins (2) are preferably cut and raised louvers.

(3) and (4) are aluminum side plates, which are arranged outside the upper and lower outermost corrugated fins (2) and fixed by brazing.

(5) and (6) are a pair of left and right hollow headers, each formed of an aluminum hollow pipe having a circular cross section. Tube insertion holes (not shown) are formed in each header (5) (6) at intervals along the length direction, and both ends of each tube (1) are inserted into the holes, and It is firmly joined and connected by attachment. Further, lid pieces (7) and (8) are attached to the upper and lower ends of the left and right headers (5) and (6), respectively. A refrigerant inlet pipe (9) is connected to the upper side surface of the left header (5), and a refrigerant outlet pipe (10) is connected to the lower side surface of the right header (6). Further, the left header (5) is provided with a partition plate (11) at a position above the center to partition the inside of the header into two chambers, while the right header (4) is also provided with a partition plate at a position below the center. (11) is provided and the inside of the header is divided into two chambers. By installing the partition plate (11), the refrigerant flowing from the refrigerant inlet pipe (9) into the left header (5) circulates in a meandering manner over all the refrigerant passages constituted by the tube group, and from the refrigerant outlet pipe (10). It is supposed to be leaked.

In the heat exchanger having the above structure, the header (5) (6)
Is the total length of the corrugated fin (1) and the side plate (3) or (4) located outside the outermost tube (1), the length of the portion being located outside the outermost tube (1). It is set to be smaller than the thickness, so that both ends of the headers (5) and (6) are side plates (3).
It does not protrude from (4). That is, the ends of the headers (5) and (6) are located inward of the positions of the side plates (3) and (4) in the longitudinal direction of the header.

The end portions of the side plates (3) and (4) are located inward of the positions of the headers (5) and (6) in the longitudinal direction of the side plates (3) and (4). ) (4) ends are designed not to directly interfere with the headers (5) and (6).

By the way, the heat exchanger is manufactured by the header (5).
(6) is formed by an electric resistance welded pipe of a brazing sheet in which a brazing material layer is formed on either the outer surface or the inner surface, and the corrugated fins (2) are also formed by the brazing sheet, and shown in FIG. So that
The side plate (3) in a state where the respective members such as the tubes (1), the corrugated fins (2), the side plates (3) and (4), the headers (5) and (6) are mutually combined.
Elongated jigs (12) and (12) are arranged on the outer surface of (4), and they are fastened together by belts (13) and (13), which are collectively brazed in a vacuum heating furnace. It can be done by

In this case, as described above, the end portions of the headers (5) and (6) are located at the side plates (3) in the longitudinal direction of the header.
Since the jig (12) is positioned inside the position (4), the length of the jig (12) is not restricted within the range of the length between the headers (5) and (6). It is convenient because the same type of jig can be used to manufacture various types of heat exchangers having different lengths between the headers (5) and (6).

Moreover, the end portions of the side plates (3) and (4) are located closer to the side plates (3) than the positions of the headers (5) and (6).
Since the end portions of the side plates (3) and (4) are positioned inward in the longitudinal direction of (4) so as not to directly interfere with the headers (5) and (6), the headers are collectively brazed. Even when (5) and (6) try to expand in the longitudinal direction, there is no strong restriction force from the bar-shaped jigs (12) and (12) through the side plates (3) and (4). The headers (5) (6) are unhindered from their longitudinal expansion and therefore the header (5)
There is no bending deformation in (6), and as a result, the heat exchanger having a good shape can be collectively brazed.

As shown in FIG. 5, before brazing,
Gap distance a between the jig (12) and the header (5) (6)
Is preferably set to 0.15 · L / 100 <a <0.7 · L / 100 in relation to the length L of the headers (5) and (6). When 0.15 · L / 100 ≧ a, the header (5) (6) is thermally expanded during brazing and the jig (12)
There is a risk of bending deformation between them, and a ≧ 0.7 ・ L / 1
With 00, when the belt (12) is tightened excessively, the tube (1) is deformed and the corrugated fins (2) are brazed in a collapsed state, resulting in, for example, heat exchanger attachment. This is because there is a risk that the position of the bolt holes of the equipment will change and the mounting of the heat exchanger will be hindered. When the distance a is set as described above, such problems are reduced, and a relatively good finished state can be obtained.

Effect of the Invention According to the heat exchanger of the present invention, the end portion of the header is positioned more inward in the longitudinal direction of the header than the position of the side plate as described above. The length of the tightening jig that is placed and used on the outside of the side plate in batch brazing is not limited within the range of the distance between the headers. In batch brazing of heat exchangers, the same long-type tightening jig can be used and the jig can be generalized, and dedicated jigs for heat exchangers with different distances between the headers can be used. It is very convenient because there is no need to prepare any ingredients.

Moreover, the end of the side plate is located inward in the longitudinal direction of the side plate with respect to the position of the header so that the end of the side plate does not interfere with the header. Even if it tries to thermally expand in its longitudinal direction, there is no possibility that the header is prevented from expanding in its longitudinal direction by receiving a strong regulating force directly from the bar-shaped jig through the side plate. The restriction force received from the bar-shaped jig at the time of expansion is only weakened indirectly through the side plate, fins, and tube, and therefore the header is not bent and deformed by collective brazing. It can be brazed together to a heat exchanger having a good shape.

Further, according to the heat exchanger having the configuration of the present application, since the end portion of the header is located more inward in the longitudinal direction of the header than the position of the side plate,
When installed on a vehicle body or the like, it is possible to effectively prevent the end portion of the header from hitting a surrounding structure and being deformed or damaged.
In that case, the side plate replaces the end of the header instead of the end of the header, but since there is a fin between the side plate and the tube, the side plate is absorbed by the shock absorbing action. It is unlikely that the plate will be deformed or damaged even to the tube, and problems such as leakage of the heat exchange medium will not occur in the heat exchanger. On the contrary, even if the side plate hits the surrounding structure,
It is also possible to prevent the structure from being damaged by the shock absorbing action of the fins. In addition, compared to the case where the position of the end of the header is higher than the position of the side plate, so-called dead space does not occur outside the side plate, and the installation space can be effectively used. The length of the header can be shortened, which can contribute to the reduction of the component cost and the cost of the heat exchanger.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of a heat exchanger according to an embodiment of the present invention, FIG. 2 is a side view thereof, and FIG. 3 is an enlarged view of an essential part of FIG. 1 and FIG. Is a front view showing an assembled state of the heat exchanger before brazing, and FIG. 5 is an enlarged view of a main part of FIG. (1) …… tube, (2) …… corrugated fin,
(3) (4) …… side plate, (5) (6) …… header.

Claims (1)

[Scope of utility model registration request] 1. A pair of hollow headers arranged in parallel, a plurality of tubes arranged in parallel between the headers and having both ends communicating with and connected to the header, and between adjacent tubes and at the outermost side. In a heat exchanger comprising fins arranged outside the tube and side plates arranged outside the outermost fin, the end portion of the header is longer than the position of the side plate in the longitudinal direction of the header. And the end portion of the side plate is located inward in the longitudinal direction of the side plate rather than the position of the header so that the end portion of the side plate does not interfere with the header. A heat exchanger characterized in that the side plate and the fin, the fin and the tube, and the tube and the header are joined and integrated by collective brazing. Vessel.