JPH04270896A - Summerized brazing method of connecting tubes for inlet and outlet ports in heat exchanger specified so as to be brazed - Google Patents

Abstract

PURPOSE:To improve the efficiency of manufacturing by a method wherein the intermediate part of connecting tubes for inlet and outlet ports of heat medium are supported by fittings for clamping, in which a pipeline clamping piece is formed integrally, to braze the tubes integrally through summerized brazing in a brazing furnace. CONSTITUTION:Upon manufacturing a heat exchanger, a plurality of tubes 1 are arranged in parallel to fit both ends of them into headers 3, 4 and interpose corrugate fins 2 between the tubes 1. An upper side plate 8 is arranged at the outside of the uppermost fins 2 while fittings 12, 13 for clamping an inlet tube and an outlet tube respectively as well as lower mounting brackets 10, 10 are fixed temporarily to lower side frames 9 through rivets 14. Then, the base ends of connecting tubes 5, 6 for the inlet and outlet ports are connected to the headers 3, 4 in temporarily fixed condition while the intermediate part of the connecting tubes 5, 6 are arranged in the clamping pieces 12c, 13c of the fittings 12, 13 for clamping and, thereafter, an incorporated body, above mentioned, is brazed integrally in a brazing furnace whereby the whole of the heat exchanger is connected and integrated.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] This invention relates to a method for collectively brazing inlet/outlet connecting pipes in heat exchangers made of brazed metal, particularly aluminum, used in condensers for car coolers, oil coolers, etc. .

0002

2. Description of the Related Art Recently, for example, as a condenser for a car cooler, a pair of hollow headers are installed in communication with both ends of a plurality of tubes arranged in parallel at a predetermined interval. This is a so-called multi-flow type in which connection pipes for the inlet and outlet of the heat exchange medium are assembled, and these heat exchanger components are integrally joined together by bulk brazing in the assembled state. Aluminum heat exchangers tend to be preferred.

[0003] Incidentally, the connection pipe for the inlet and outlet of the heat exchange medium may have to be routed to a predetermined position due to the installation space of the heat exchanger on the vehicle body or the arrangement with the piping on the vehicle body side. Yes, in that case, a long one is used as the connecting pipe.

[0004] In such a case, the heat exchanger is manufactured by fixing the middle part of the connecting pipe with a jig so that it does not move when the heat exchanger components are temporarily assembled with each other, and in that state, assembling the entire heat exchanger. They were joined together by bulk brazing. Of course, after brazing, remove the jig. Thereafter, in order to prevent the connecting tube from wobbling or the like, as shown in FIG. 8, the intermediate portion of the connecting tube is fixed to the heat exchanger body using a clamp fitting (51). This clamp fitting (51) includes a clamp stand (53) fixed to the heat exchanger body (52), and a separate strip-shaped clamp having a curved part (54a) for fitting pipes in the middle part. piece (54), and both of them connect the connecting pipe (55).
) and was of a type that surrounded the outer circumferential surface of the intermediate part and was fastened with bolts (56).

[0005]

However, as described above, it is necessary to attach a jig to the inlet/outlet connecting pipe (55) during brazing, remove it after brazing, and then attach the clamp fitting (51). This method required a lot of effort to manufacture the heat exchanger and was inefficient. In addition, the clamp fitting (51) is a clamp base (53).
It has a complicated structure consisting of a combination of multiple parts including a clamp piece (54) and a bolt (56), which results in high costs and requires time and effort to install.

The present invention solves the above-mentioned conventional drawbacks and improves the manufacturing efficiency of a brazed heat exchanger using long-sized connecting pipes for the inlet and outlet of the heat exchange medium. The main purpose of the present invention is to provide a method for collectively brazing inlet/outlet connecting pipes that can contribute to the improvement of the present invention.

[0007]

[Means for Solving the Problems] To achieve the above object, the present invention provides a heat exchanger assembly using a clamping fitting in which a piping clamp piece is integrally molded, and in which the clamping fitting is temporarily assembled before being brazed. At the same time, the clamp piece is held and crimped to the outer peripheral surface of the intermediate part of the temporarily assembled heat exchange medium inlet/outlet connection pipe, and then, in this state, the clamp piece and the connection pipe are connected to each other for heat exchange. The gist of this invention is a method for collectively brazing inlet and outlet connecting pipes in a heat exchanger with brazing specifications, which is characterized in that when collectively brazing the component parts of the heat exchanger, they are joined together by brazing together.

[0008]

[Operation] In the above method, the clamping fitting functions as a clamping fitting that fixes the inlet/outlet connecting pipe in a supported state after brazing, and also as a jig that supports the connecting pipe of the heat exchanger assembly before brazing. It also functions as In addition, to install the clamp piece, simply caulk it onto the connecting pipe, and the rest is secured to the connecting pipe by brazing all at once.
This installation work does not require any effort or burden.

[0009]

EXAMPLE Next, an example will be described in which the method of the present invention is applied to the manufacture of a multi-flow heat exchanger for a car cooler condenser. The method of the present invention can be applied to various multi-flow type heat exchangers such as room air conditioner heat exchangers and oil coolers, as well as serpentine type heat exchangers in which the core is formed by bending a tube into a meandering shape. As such, it goes without saying that the present invention can be widely employed in the manufacture of various heat exchangers in which it is necessary to route and lengthen the connecting pipes for the inlet and outlet of the heat exchange medium.

In FIGS. 1 to 3 showing the overall structure of the heat exchanger after manufacture, (1) is a flat tube, (2) is a flat tube, and (2) is a flat tube.
are corrugated fins, which are arranged in parallel vertically alternately. (3) and (4) are left and right hollow headers, which are connected to both ends of the flat tube (1) in a communicating state. (5) is a heat exchange medium inlet pipe connected in communication with the upper end side of the right header (3); (6) is
This is the outlet pipe connected to the lower end side of the left header (4). (7) is a partition member that allows the heat exchange medium to flow through the tube (1) group in a meandering manner.
4) The inside is partitioned at a predetermined height position. (8) is an upper side plate, which is placed outside the uppermost corrugated fin (2) to protect the fin. (9) is a lower side frame which is arranged outside the lowest corrugated fin (2) to protect the fin and to which various brackets, metal fittings, etc. are attached. (10) (10) is a lower mounting bracket made of aluminum brazing sheet for mounting a heat exchanger to the vehicle body at its lower part; (11)
) (11) is an upper mounting bracket made of aluminum brazing sheet for mounting the heat exchanger on the vehicle body at its upper part. (12) is an inlet pipe clamp fitting that fixes the middle part of the inlet connecting pipe (5), and (13) is an outlet pipe clamp fitting that fixes the middle part of the outlet connecting pipe (6). be.

Next, to explain the structure of the main members, the flat tube (1) is made of an extruded aluminum material, and although not shown, the inside is divided into a plurality of chambers by partition walls for heat transfer. It uses a so-called harmonica tube with improved performance. In addition, regardless of the extruded material,
ERW tubes may also be used.

[0012] The corrugated fin (2) has a tube (1
) is formed into a corrugated shape with a louver cut and raised, and this sheet material is an aluminum brazing sheet clad with a brazing material layer.

The headers (4) and (5) are cylindrical header pipes each having an opening at the end thereof, which is formed into a pipe shape by forming an aluminum brazing sheet clad with a brazing material layer on one or both sides so that both edges butt each other. is closed with an aluminum header cap that is fitted externally.

Inlet connecting pipe (5) and outlet connecting pipe (6)
) are all made of aluminum tubes. The inlet connecting pipe (5) extends from the connection part with the right header (4) into the heat exchanger main body so as to be inclined diagonally downward and bent in the middle. Also,
The outlet connecting pipe (6) extends horizontally inward from the connection part with the left header (3), and is bent in the middle so that the tip thereof faces upward.

As shown in FIG. 6, the lower side frame (9) is made of aluminum material formed into a cylindrical shape with a rectangular cross section, and is manufactured by a processing method such as extrusion molding or sheet material press molding. It is what was done. Bent portions (9a) (9a) supporting the end surfaces of the fins (2) are formed at both ends of the upper surface. Furthermore, rivet holes (9b) for attachment are bored on both sides. The side frame (9) may be a semi-hollow one with an open bottom as shown in Figure 7 (A) and (B), or a half-hollow one with an open bottom as shown in Figure 7 (A) and (B).
A hollow one as shown in (d) may be used.

As shown in FIGS. 1 to 3, the inlet pipe clamp fitting (12) has an outward L-shaped cross section with both base ends attached to the side frame (9). The upper edges of the tips of the left and right legs (12a) (12a) are connected together by a connecting plate (12b), and a tube is attached to the tip of the connecting plate (12b) as shown in FIG. Before installation, the central portions of the U-shaped clamp pieces (12c) are connected together. This clamp fitting (12
) is manufactured by integral molding from an aluminum brazing sheet.

[0017] Furthermore, the outlet pipe clamp fitting (13) is
Left and right legs with outward L-shaped cross section (13a) (13a)
As shown in Fig. 5, a bent J-shaped clamp piece (1
3c) are connected together. This clamp fitting (13) is also an integrally molded product from an aluminum brazing sheet.

[0018] In manufacturing the heat exchanger, first, the constituent members of the heat exchanger are assembled into a tentative state. That is, a plurality of tubes (1) are arranged in parallel at predetermined intervals in the thickness direction, and headers (4) (
5) is fitted by inserting the end of the tube (1) into the header side tube insertion hole, and the corrugated fin (2) is inserted between the tubes (1). Also,
The upper side plate (8) is attached to the outside of the uppermost fin (2).
). Furthermore, the lower side frame (9) is equipped with an inlet pipe clamp fitting (12) and an outlet pipe clamp fitting (
13), other lower mounting brackets (10) (10
) are temporarily fixed with rivets (14), and the lower side frame (9) is placed outside the lowermost fin (2). In addition, the proximal ends of the inlet/outlet connecting pipes (5) (6) are connected to the headers (3) (4) in a temporarily fixed state, and the intermediate parts are connected to the clamp pieces ( 12c) (13c), and the clamp pieces (12c) (13c) are held on the outer peripheral surfaces of the connecting pipes (5) and (6) as shown in FIGS. 4 and 5. Caulk. Note that there is no particular restriction on the order of temporary assembly, and it may be performed in various orders.

[0019] Then, this heat exchanger assembly is collectively brazed with, for example, fluoride flux in a brazing furnace to join and integrate the whole. By this batch brazing, the tube (1), fin (2), header (3) (4), upper side plate (8), lower side frame (9), inlet connecting pipe (5), outlet connecting pipe (6) are mutually joined and integrated, and both lower mounting brackets (10) (10) are attached to the headers (3) (4).
) and the lower side frame (9). Both clamp fittings (12) and (13) also have their proximal ends attached to the lower side frame (9), and the clamp pieces (12c) (
13c) are collectively brazed to the connecting pipes (5) and (6), respectively.

[0020] Until this brazing, the intermediate portions of the inlet/outlet connecting pipes (5) and (6) are held by the clamp fittings (12 and 13), and their jig-like action prevents them from swinging. Does not occur. After the brazing is completed, the clamp pieces (12c) (
13c) are integrally joined to the connecting pipes (5) and (6),
After that, without taking any special measures, it functions as a clamp fitting for the connecting pipes (5) and (6) as it is.

[0021] The clamp piece according to the present invention may have any shape as long as it can be held and crimped around the outer periphery of the connecting pipe, and is not limited to the shape of the above embodiment. In addition, in the above embodiment, the clamp fittings (12) and (13) are made of brazing sheets, but these are made of ordinary aluminum sheets and the clamp pieces (12c) are attached to the connecting pipes (5) and (6).
(13c) Bulk brazing may be performed by a method such as brazing. Furthermore, the clamp fittings (12) and (13) can be attached to the heat exchanger body in addition to the side frame (9) as described above, headers (3) and (4), tubes (1) and fins (2). It may also be applied to the heat exchanger core. Furthermore, the method of attachment is not limited to the method of temporarily fixing with rivets (14) as described above and then brazing all at once.

[0022]

Effects of the Invention As described above, the method for collectively brazing the inlet/outlet connecting pipes in a brazed heat exchanger according to the present invention uses a clamping fitting in which a piping clamp piece is integrally molded, and Attach the metal fittings to the heat exchanger assembly in a pre-assembled state before brazing, and crimp the clamp piece to the outer peripheral surface of the intermediate portion of the heat exchange medium inlet/outlet connection pipe in the same pre-assembled state, and then, In this state, the clamp piece and the connecting pipe are integrally brazed together when the heat exchanger component members are collectively brazed to each other. However, compared to the complicated work of installing a jig during brazing, removing it after brazing, and then installing a new clamp fitting, the efficiency of manufacturing the heat exchanger is improved. You can improve your performance.

[0023] Also, when installing the clamp piece, all you have to do is swage it onto the connecting pipe, and then it will be joined and fixed to the connecting pipe by bulk brazing. The effort and burden required to attach the clamp piece to the connecting pipe can also be reduced.

Moreover, since the clamping metal fitting has a clamping piece integrally and does not require the use of bolts, the clamping structure can be simplified and it is advantageous in terms of cost. Furthermore, the clamp piece and the connecting pipe are ultimately
Since they are joined together by brazing, the joint strength between the two is extremely high, and excellent durability can be provided.

[Brief explanation of the drawing]

FIG. 1 is an overall front view of a heat exchanger.

FIG. 2 is an overall plan view of the heat exchanger.

FIG. 3 is an overall side view of the heat exchanger.

FIG. 4 is a side view of the inlet pipe clamp fitting.

FIG. 5 is a side view of the outlet pipe clamp fitting.

FIG. 6 is a perspective view of the side frame.

FIG. 7 is a cross-sectional view of the intermediate portion of the side frame.

FIG. 8 is a front view of a main part of a heat exchanger showing a state in which a conventional clamp fitting is used.

[Explanation of symbols]

5…Inlet connection pipe 6...Outlet connection pipe 12, 13... Clamp fittings 12c, 13c...clamp piece

Claims (1)

[Claims] 1. Using a clamping fitting in which a piping clamp piece is integrally molded, the clamping fitting is attached to a heat exchanger assembly in a pre-assembled state before brazing,
The clamp piece is held and crimped onto the outer peripheral surface of the intermediate portion of the temporarily assembled heat exchange medium inlet/outlet connection pipe, and then, in that state, the clamp piece and the connection pipe are connected to each other in the heat exchanger component. A method for collectively brazing inlet/outlet connecting pipes in a heat exchanger with brazing specifications, characterized in that when collectively brazing, the joints are integrated by collectively brazing.