JPS5937392A - Connecting structure of pipe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a pipe connection structure in piping.

2. Description of the Related Art Examples of pipe joints used in conventional air conditioning piping for automobiles include those shown in FIGS. 1 and 2, for example. In the figure, reference numeral 1 denotes a metal seven flange having a through hole Za, a protrusion Zb is formed on the inner end surface, and the through hole Za passes through this protrusion Ib. Also, the inner diameter of the through hole 1h is set to be slightly smaller than the outer diameter of the tube 2 made of aluminum alloy, etc., but it is formed to the extent that the end of the tube 2 can be inserted near the outer end surface of the 7 lange I. There is.

The other 7 flange 3 has a recess 3b that opens on the inner end surface and fits into the protrusion Ib of the 7 flange I, and the through hole 3a communicates with this recess 3b. Furthermore, the inner diameter of the through hole 3a is set to be slightly smaller than the outer diameter of the tube made of aluminum alloy, etc., but near the outer end surface of rank 3, it is formed to the extent that the end of the tube can be inserted. ing. In addition,
The tube 2 and the tube I are brazed all around at the joint 6 with the flanges I and 3, respectively. The flanges I and 3 are joined by passing a bolt 7 through a bolt hole 10 penetrating through the 7 flange I and screwing it into a female threaded portion 11 provided on the 7 flange 3 via a spring washer 8 and a flat washer 9. At this time, an O-ring 5 made of a rubber tube passed through the protrusion Ib of the flange 1 is compressed by a counterbore provided around the entire opening of the recess 3b of the flange 3.

However, in such conventional pipe joints, the pipe 2
and pipe q must be brazed around the entire circumference at joint 6 to flanges I and 3, respectively, and in this case, it is necessary to pickle the joint 6, making the work of joining the pipe to the flange troublesome. Top, protrusion I on flange I to ensure coolness
The fitting of the recess 3b of the flange 3 to the recess 3b of the flange 3 requires high precision, which poses a problem in that it requires a large amount of cost and man-hours to manufacture.

In view of such conventional problems, the present invention aims to simplify the work of connecting the tube and the 7-lunge, and to reduce manufacturing costs and man-hours for ensuring coolness.
For one flange having a counterbore formed in the through hole and the inner end surface, one tube having a collar near the end is inserted into the through hole such that the counterbore and the collar engage. While inserting the other tube, which has a flared portion at its end, into the other 7 langes, which have a through hole and a counterbore portion formed on the inner end surface, the counterbore portion and the flare portion engage with each other. A tube connection structure is provided which is inserted into the through hole and fastens both flanges via an O-ring between the collar portion of the one tube and the flare portion of the other tube.

Hereinafter, a first embodiment of the present invention will be described with reference to the drawings, using the same reference numerals for the same parts as in the conventional art.

In FIG. 3, I is a metal seven flange having a through hole Ia, and a tube 2 made of aluminum alloy or the like is inserted into the through hole Za.
is inserted, and the outer peripheral surface of the tube 2 and the inner peripheral surface of the through hole Za are in contact with each other. The inner circumferential surface of the through hole Ia has folds Ic extending in the longitudinal direction of the tube 2, creating a sliding resistance against the outer circumferential surface of the tube 2 and preventing the flange 1 from shifting. Zd is a counterbore portion formed on the inner end surface of the flange I, centering on the through hole 1a, and a collar formed around the entire circumference of the tube 2 by folding the tube 2 itself by press molding near the end of the tube 2. It engages with part 2a. Reference numeral 2b denotes a tube end portion folded back from the flange portion 2a of the tube 2, which is narrowed by press molding to an outer diameter such that it comes into contact with the inner circumferential surface of the tube 1 when inserted into the tube 1, which will be described later.

On the other hand, 3 is a metallic 7-lunge having a through hole 3a, into which a tube q made of aluminum alloy or the like is inserted, and the outer peripheral surface of the tube q and the inner surface of the through hole 3a are in contact with each other. . The inner circumferential surface of the tube 3a has folds 3c extending in the longitudinal direction of the tube to prevent the flange 2 from moving in the same manner as described above. 3d is a counterbore portion centered on the through hole 3a formed on the inner end surface of the flange 3, and a flange portion IIa is formed at the end of the tube q by opening the tube V itself by press molding.
The flare portion Qb is engaged with the flare portion Qb. Further, 5 is an O-ring made of rubber or the like, between the collar part 28 of the pipe 2 and the flare part of the pipe l <tb]. Compressed when worn. I
O and 11 are bolt through holes and female threads formed in the flanges I and 3, respectively. Incidentally, instead of providing pleats on the inner peripheral surfaces of the through holes r8 and 3a of the flanges I and 3, recesses are formed, and bead portions that engage with the recesses are formed on the outer peripheral surfaces of the pipes 2 and 7. It is also possible to prevent free movement of the lunge.

Item above)? In order to perform piping using the pipe connection structure according to the present embodiment described above, first, an O-ring is passed through the pipe end 2b protruding from the inner end of the 7 flange I, and the pipe end 2b is connected to the flange 2. Flare part of pipe l opening on the inner end surface of <<b
After the two flanges I and 3 are inserted and connected, the two flanges I and 3 are tightened with bolts as in the conventional method.

FIG. 4 shows a second embodiment of the present invention, in which the flange!
Counterbore portions Zd and 3d are also provided on the outer end surfaces of the tubes 2 and 3, and the flanges 2d and ψd formed by folding back the tubes 2 and V themselves by press molding are engaged with the counterbore portions Id and 3d to form the flange I. Sandwich the flange part Zd and 2d, and flare the flange 2 (r, (Hq h) with the end flange part f
It is set so as to be sandwiched between the flange portion a and the flange portion +7d, and the other functions of the configuration 1 are the same as those of the first embodiment, so a description thereof will be omitted.

According to this embodiment, the flanges I and 3 are completely integrated with the tubes 2 and q, respectively, and the movement of the 7 flanges I and 3 is completely prevented.

As explained above, according to the present invention, there is no need to connect the pipe to the 7th flange by brazing, and therefore the pickling work, which is a pre-brazing process, can be omitted, and the shape of the through hole of the 7th flange can be omitted. This is much simpler than the conventional example, and since the precision in ensuring sealing performance is obtained by press molding with high processing precision, it is possible to greatly reduce manufacturing costs and man-hours.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional pipe joint, and Figure 2 is A-A in Figure 1.
3 is a sectional view taken along line A, FIG. 3 is an explanatory sectional view of the state before the flanges are fastened together, showing the first embodiment of the present invention, and FIG. 4 is a third diagram showing the second embodiment of the present invention. It is a cross-sectional explanatory view similar to. 1.3=・Flange, Za, Ja・・−Through hole, Id1
3d...Spot-bore part, 2a...Brim part, gb...Flare part, 2,4(...Pipe, 5...0s/g. Fig. n 7 Fig. 2 Fig. 3 Fig. 4

Claims (1)

[Claims] (1) For one of the 7 langes in which a through hole and an inner end surface (spotted portion) are formed, the counterbore portion and the flanged portion engage with one of the tubes that has a collared portion near the end. While inserting the other tube into the through hole, the other tube having a 7 radial portion at its end is inserted into the 7 flange with the 7 flange formed in the through hole and the inner end surface. are inserted into the through hole so as to engage with each other, and both of the seven flanges are fastened via an OIJ ring between the collar portion of the one tube and a portion of the flare of the other tube. Connection structure for pipes.