JPH02176397A - Heat exchanger - Google Patents

Abstract

PURPOSE:To secure the strength of a header and facilitate the fixing of tubes by a method wherein the cylindrical wall of the header is constituted of a header pipe, on which an opening for inserting a working jig is formed with a given width, and a header cover, inserted into the pipe. CONSTITUTION:An opening 12, notched with a given width, is formed on the circular cylindrical body of a header pipe 11. A header cover 13, inserted into the pipe 11 and closing the opening 12, is formed on the inner periphery of the pipe 11. The cover 13 is provided with an arced configuration and the outer peripheral surfaces of both end rims 131, 132 of the same are connected to the inner peripheral surface of the opening rims of the pipe 11. The opening 12 is for inserting a jig for forming the attaching hole 4 of a tube 2 by applying burring work on the remaining side wall of the pipe 11. According to this method, stress concentration will never be generated on the connecting part of a cylindrical plate whereby the strength of a heat exchanger may be secured. On the other hand, the inserting opening of the jig is provided and, therefore, burring work may be facilitated and the fixing as well as the positioning of the tube 2 can also be facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a heat exchanger used in automobile or home air conditioners.

[Prior art] This type of heat exchanger is, for example, the
There is a multipath header type shown in .874. The configuration is shown in Fig. 5. A plurality of flat tubes 2 are arranged in parallel between a pair of left and right header sections 1 that store a heat exchange medium, and a heat dissipation tube is arranged between the plurality of tubes 2. Corrugated fins 3 are provided.

By the way, in applications where pressure resistance is required, the header section 1 is often constructed of circular tubes that are advantageous in terms of strength (Fig. 6), and the connection between the header section 1 and each tube 2 is as follows. Usually, a plurality of elongated holes 4 are formed in the opposing tube walls of the header section 1 at regular intervals in the vertical direction, and both ends of the tube 2 are inserted and fixed into the elongated holes 4.

[Problems to be Solved by the Invention] Conventionally, the elongated hole 4 is formed by press working with molds placed inside and outside the circular tube. There is a problem that the paris gets caught and is difficult to remove. Therefore, it has been impossible to perform burring, which is desirable for securely fixing the tube, because the mold cannot be removed.

From this point of view, or in order to make the amount of insertion of the end of the tube 2 into the elongated hole 4 constant, conventionally, a step is provided at the end, and the step is placed on the side of the header portion 1 on the periphery of the elongated hole 4. Although it is designed to make contact with the wall surface, as the tube 2 becomes flatter,
In order to secure the cross-sectional area, the wall thickness of the tube 2 is reduced, making it difficult to form a stepped structure.

Therefore, as shown in FIG. 7, the header portion 1 is constructed of two semi-cylindrical plates 17.18, and flanges 171.181 are formed at both ends of the semi-cylindrical plates 17.18.
181, but this configuration allows burring, etc., but the flange joint 1
Since 9 is wedge-shaped, stress is concentrated there, causing a problem that the strength of the header portion 1 is reduced.

The present invention solves these problems, and allows easy molding and processing of the header without reducing its strength.
Another object of the present invention is to provide a heat exchanger whose tubes can be easily fixed and positioned.

[Means for Solving the Problem] As shown in FIGS. 1 and 2, the heat exchanger of the present invention has a cylindrical wall of a header portion 1 formed by forming a circular cylindrical body with a constant width at one point in the circumferential direction. a header pipe 11 with an opening 12 formed by cutting it out;
Both end edges 131.13 are inserted into the header pipe 11 and have an arc shape continuous to the inner circumference of the header pipe 11.
2, and a header cover 13 whose outer peripheral surface is joined to the inner peripheral surface of the opening edge of the header pipe 11 to close the opening 12, and the opening 12 is formed by performing burring on the remaining side wall of the header pipe 11. This opening serves as an insertion opening for a jig for forming the mounting hole 4.

[Operation] In the heat exchanger having the above configuration, a burring jig 6 is inserted into the header pipe opening 12 before it is closed by the header cover 13 (Fig. 4), and the side surface of the header pipe 11 is burred. The mounting hole 4 with the tube holding portion 15 attached thereto can be easily formed. The jig 6 after burring can be easily pulled out from the opening 12.

The insertion amount of the tube 2 into the mounting hole 4 is determined by the amount of insertion of the tube 2 into the mounting hole 4.
Furthermore, by inserting another jig and bringing it into contact with the insertion end of the tube 2, it is possible to regulate the amount to an appropriate constant amount.

The opening 12 is closed by joining the inner peripheral surface of the opening 12 edge with the outer peripheral surface of both ends of the header cover 13 in surface contact, so that a wedge-shaped joint as in the conventional case does not occur, and the header is closed due to stress concentration. A decrease in strength of the portion 1 is prevented.

[Example] Hereinafter, an example of the present invention will be described based on the drawings. In FIGS. 1 and 2, 1 is a header section composed of a header pipe 11, a header cover 13, and a separator 5, and a plurality of tubes 2 made of flat tubes are inserted and fixed into the side wall of the header section 1. and these multiple tubes 2
A corrugated fin 3 is provided between them.

The header pipe 11 has a substantially cylindrical shape, and has an opening 12 formed by cutting out a certain width at one place in the circumferential direction.
2 is integrally provided with a flat mounting bracket 14 that protrudes outward from both end edges. A plurality of elongated holes 4 are formed at regular intervals in the vertical direction on the pipe wall of the header pipe 11 facing the opening 12, and the elongated holes 4 are burred into cylinders for holding the tubes 2. A holding portion 15 having a shape is attached. The opening 12 serves as an insertion opening for a jig when burring the header pipe 11, and is therefore formed so that the width W1 of the opening 12 is larger than the width W2 of the holding portion 15.

The header cover 13 has a semi-cylindrical shape and is molded so that its outer circumferential diameter is the same as the inner circumferential diameter of the header pipe 11. The header cover 13 is inserted into the header pipe 11 and its outer peripheral surfaces 131 and 132 are joined to the inner peripheral surface of the opening edge of the header pipe 11, thereby closing the opening 12. Projections 16 are formed at multiple locations on the inner peripheral surface of the header pipe 11 along the edge of the header cover 13.
13 to prevent the position from shifting when inserted.

As shown in FIG. 3, the separator 5 is formed to have the same shape as the cross section of the header portion 1, and is inserted and fixed into slit grooves 51 provided at both ends of the header pipe 11 or at predetermined positions in the middle.

Next, a method of forming the header pipe 11 will be described. As a material for the header pipe 11, a plating sheet coated on both sides with a brazing material can be used, and after this plating sheet is formed into a substantially cylindrical shape, it is subjected to a burring process. As shown in FIG. 4, burring jigs 6 and 7 are inserted in the directions of the arrows to form an elongated hole 4 with a holding portion 15 attached to the side wall of the header pipe 11. At this time, the opening 12 of the header pipe 11 serves as an insertion opening for the jig 6, and after machining, the jig 6 can be pulled out in the same direction as the machining direction, so that burring can be easily performed.

Further, a positioning protrusion 16 is punched out at a predetermined position on the side wall of the header pipe 11, and a slit groove 51 is formed.

The header cover 13 and separator 5 are also molded using the same plating sheet.

For assembly, after the fins 3 and tube 2 are stacked, the tube 2 is inserted through the elongated hole 4 of the header pipe 11 and positioned. The insertion amount of the tube 2 can be regulated to an appropriate constant amount by further inserting another jig through the opening 12 and bringing it into contact with the insertion end of the tube 2. In addition, by expanding the tube 2 after assembling the tube 2, reliable fixation can be achieved, and brazing does not sometimes cause displacement. Next, the header cover 13 is inserted into the header pipe 11, the separator 5 is attached, and then integrally brazed to form a product.

[Effects of the Invention] According to the present invention, the cylindrical wall of the header portion includes a header pipe in which an opening is formed by cutting a circular cylindrical body with a certain width at one point in the circumferential direction, and a header pipe that is inserted into the header pipe. The outer circumferential surface of both ends of the header cover is joined to the inner circumferential surface of the opening edge of the header pipe to close the opening, so stress concentration does not occur at the joints as in the conventional case. This ensures strength.

Further, since an opening is provided in the header pipe to serve as an insertion opening for a jig for burring, burring can be easily performed, the tube can be easily fixed and positioned, and a highly reliable product can be obtained.

[Brief explanation of the drawing]

Figures 1 to 4 show an embodiment of the present invention, in which Figure 1 is a cross-sectional view of the main parts of a heat exchanger, Figure 2 is a cross-sectional view taken along the TI line, and Figure 2 is a cross-sectional view of the main parts of the heat exchanger. 3 is a front view of the separator, and FIG. 4 is a diagram showing a method of processing the holding part.
FIG. 5 is an overall configuration diagram of a conventional heat exchanger, FIG. 6 is an enlarged view of the main part of FIG. 5, and FIG. 7 is a partial sectional view of a conventional header section. 1...Header part 11...Header pipe 12...Opening 13...Header cover 131.132...Both edges of header cover 2.・
...Tube 3...Cork cable fin (fin) 4...
...Elongated hole (mounting hole) Fig. 1 Fig. 3 Fig. 4

Claims (1)

[Claims] A pair of left and right header sections of a closed cylindrical body for storing a heat exchange medium is provided, and a plurality of mounting holes are formed at regular intervals in the vertical direction on the opposing side walls of each of these header sections, and a plurality of mounting holes are arranged in parallel between the header sections. In the heat exchanger, both ends of the tubes are inserted and fixed into the mounting holes, and heat radiating fins are provided between the tubes in contact with them. The header pipe has an opening formed by cutting out a certain width at one place, and the outer circumferential surface of both ends of the header pipe is inserted into the header pipe and has an arc shape that continues to the inner circumference of the header pipe. and a header cover that is joined to the inner peripheral surface of the opening edge to close the opening, and the opening is an insertion opening for a jig for forming the mounting hole by performing burring on the remaining side wall of the header pipe. A heat exchanger characterized by: