JPH0234551Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a pipe joint device that integrally connects two pipes, and is suitable for connecting refrigerant pipes of vehicle air conditioners, etc. .

(Prior art) As a conventional pipe joint device, for example,
Some of these are disclosed in Publication No. 21348 and Japanese Utility Model Application Publication No. 144294/1983. These pipe joint devices are formed into a U-shaped plate-shaped clip made of an elastic material, with flanges provided on the distal end side of one connecting pipe to be inserted and on the distal end side of the other connecting pipe to be inserted. Fit the square fitting holes into both flanges mentioned above and attach the plate-shaped clip, engage both flanges to the sides of the fitting holes, and use the plate-shaped clip to connect the shafts of both connecting pipes. This prevents separation in both directions and connects both connecting pipes.

(Problems to be solved by the invention) However, although the above-mentioned conventional pipe joint device can fix both connecting pipes in the axial direction, both connecting pipes can rotate relative to each other at the connecting part, so the following problems occur. There is a problem like this.

(i) For example, if the connecting pipe is a refrigerant pipe for a vehicle, the connecting pipe is bent at multiple points in the engine room due to space reasons, so one pipe may rotate at the joint. This may cause wear and tear on the O-ring, gasket, etc. interposed between the two connecting pipes, resulting in loss of airtightness.

(ii) Generally, both connecting pipes are positioned with respect to each other at the joint and then piped as is.
Since both connecting pipes are relatively rotatable, the position of the connecting portion may shift during piping assembly, and the positioning must be repositioned, which poses a problem of troublesome assembly work.

Therefore, the present invention aims to provide a pipe fitting device with a function to prevent relative rotation of connecting pipes, thereby preventing wear and damage of O-rings, etc. caused by relative rotation, and improving workability of pipe assembly. The purpose is to provide equipment.

(Means for Solving the Problems) The pipe joint device of the present invention inserts the distal end of one connecting pipe into the other connecting pipe, and connects both flanges provided on the outer periphery of the distal ends of both connecting pipes. is fitted into a square fitting hole formed in a plate-shaped clip made of an elastic material, and the plate-shaped clip is
The plate is bent into an arbitrary shape surrounding both of the flange portions, and engagement grooves are formed in both of the flange portions, and an engagement protrusion that engages with both of the engagement grooves is formed on the plate. The structure is such that it is attached to a shaped clip.

(Function) Therefore, both flanges engage with the sides of the fitting hole of the plate-shaped clip, which prevents the connecting pipe from coming off in the axial direction, while also preventing the engagement of both flanges. By engaging the engagement protrusion of the plate-shaped clip with the groove, relative rotation of the connecting pipe is prevented.

(Example) An example of the present invention will be described below based on the drawings.

FIG. 1 is a longitudinal sectional view showing a jointed state in which connecting tubes 1 and 2 are integrally connected by a plate-shaped clip 3, and FIG. 2 is a sectional view taken along the - arrow in FIG. As shown in both figures, one connecting tube 1 has its distal end inserted into the other connecting tube 2, and an annular flange formed by bulging the tubular body 1 outward and caulking the distal end thereof. A section 1a is provided.
The flange portion 1a has a cross-sectional shape that gradually tapers from the connecting pipe 1 to the top thereof, so that both side surfaces thereof are formed into slightly sloped surfaces.

Further, the distal end of the connecting tube 1 is formed to have a slightly small diameter, and a stepped portion 1b and a small diameter portion 1c are provided at the distal end. The distal end side of the other connecting pipe 2 is formed into an enlarged diameter part 2c having the same diameter as the one connecting pipe 1 through a stepped part 2b corresponding to the stepped part 1b of the one connecting pipe 1, and a flange is attached to the distal end. A section 2a is provided. The flange portion 2a is also formed to have a slightly inclined cross-sectional shape so that it can make surface contact with one of the inclined surfaces of the flange portion 1a. Further, an O-ring 4 is interposed between the stepped portions 1b and 2b of both connecting tubes 1 and 2, thereby ensuring an airtight state during connection. Furthermore, both of the above flange portions 1a
and 1b are provided with axial engagement grooves 1d and 2d.

A plate-shaped clip 3 is provided on the outer periphery of the connecting portion of both of the connecting tubes 1 and 2 to restrict the axial movement of both of the connecting tubes 1 and 2. As shown in FIG. 3, this plate-shaped clip 3 is formed by bending an elastic plate-shaped member such as spring steel into a substantially quadrilateral shape that surrounds the outer periphery of both flange portions 1a and 2a. Engaging portions 3a and 3b that engage with each other are provided. In addition, in the figure of the plate-shaped clip 3,
A rectangular fitting hole 5 is provided on each of the left and right sides and has a width that allows fitting of both flanges 1a and 2a during connection. A locking protrusion 6 is provided on the lower side of the plate-shaped clip 3 in the figure, and the locking protrusion 6 is inserted into the engagement grooves of both the flanges 1a and 2a, as shown in FIG. It engages with both 1d and 2d, and restricts relative rotation between both connecting pipes 1 and 2.

Furthermore, among the sides of each hole 5 of the plate-shaped clip 3, the side that touches the flange portion 1a or 2a is as follows:
As shown in FIG. 4, they are formed into slightly inclined surfaces corresponding to the flange portions 1a or 2b in contact with each other. Therefore, the hole 5
When the plate-shaped clip 3 is fitted, the side portions come into surface contact with the flange portions 1a and 2a, respectively.

In such a pipe joint device, an O-ring 4 is fitted around the small diameter portion 1c of one connecting pipe 1 and inserted into the other connecting pipe 2, and both flange portions 1a, 2
After aligning the engaging grooves 1d and 2d of a, as shown in FIG. It is installed by fitting both flanges 1a and 2a into each hole 5 and engaging the locking portions 3a and 3b at both ends, allowing pipe connection to be made with a single touch operation. Also, both connecting pipes 1
and 2, since both flange portions 1a and 2a are locked in each fitting hole 5, axial movement is restricted and both connecting pipes 1 and 2 can be reliably connected. In addition, since the abutting surfaces of the flange portions 1a and 2a of each fitting hole 5 are formed as inclined surfaces matching the inclined surfaces of the flange portions, the connection ability through surface contact is further enhanced, and both the flange portions 1a , 2a toward each other, a suitable pressing force is secured on the O-ring 4 between the connecting pipes 1 and 2, and airtightness can be further ensured. Furthermore, engagement grooves 1d and 2d of both flange parts 1a and 2a
Since the engaging protrusion 6 of the plate-shaped clip 3 is engaged with the connecting tube 3, relative rotation between the connecting tubes 1 and 2 is prevented, and as a result, the connecting tubes 1 and 2 can be repositioned even during piping work and installation work. It is no longer necessary to do so, simplifying the work, preventing wear and damage caused by the rotation of the O-ring 4 interposed between the connecting pipes 1 and 2, and ensuring airtightness. It can be done.

Incidentally, the plate-shaped clip is not limited to the four-sided shape as in the above embodiment, but may be the one shown in FIGS. 5, 7, and 8.

The plate-shaped clip 8 shown in FIG. 5 is formed in a substantially circular shape, has fitting holes 5 at two substantially equal locations, and has engagement grooves 1d and 2 on both flanges 1a and 2a on one end side.
The engagement protrusion 6 that engages with d is provided by molding. A schematic cross section of this installed state is shown in FIG.

The plate-shaped clip 9 shown in FIG. 7 is formed into a substantially polygonal shape, and fitting holes 5 are provided at four equal locations, and one side has both flange portions 1a and 2.
Engagement protrusions 6 that engage with the engagement grooves 1d and 2d of a are provided in a protruding manner.

The plate-shaped clip 10 shown in FIG. 8 is formed into a substantially triangular shape, has two fitting holes 5, and has similar engagement protrusions 6 protruding from both ends. The engaging portions 10a and 10b are provided.

In addition, various plate-shaped clips 8, 9,
10, the side portions of each fitting hole 5 in contact with the respective flange portions 1a, 2a are formed as inclined surfaces, which has the same effect as the above embodiment.

Furthermore, in each of the above-described embodiments, a case has been described in which the side portions of the fitting hole 5 in contact with the respective flange portions 1a, 2a are formed as inclined surfaces corresponding to the respective flange portions 1a, 2a, but the invention is not limited to this. First, it may be configured as shown in FIG.

FIG. 9 shows a longitudinal section of the fitting hole 5 fitted into both flange parts 1a and 2a, and each flange part 1
A protruding piece 5a or 5b is provided on the side of each fitting hole 5 in contact with the flange portions 1a and 2a by molding or the like, and these protruding pieces 5a and 5b are attached to the inclined surface of each flange portion 1a or 2b in contact with the flange portions 1a and 2b. It is formed with a slight inclination to correspond. Therefore, the same effect as when the contact side of the fitting hole 5 is formed into an inclined surface can be obtained.

Note that the fitting holes 5 of the plate-shaped clips 3, 8, 9, and 10 are not limited to those shown in the drawings.
A plurality of fitting holes that can be fitted to both flanges may be provided at equal locations. Further, the flange portion provided on the connecting pipe is not limited to the one shown in the drawings, and it goes without saying that the present invention can also be applied to a case where both flange portions are spaced apart from each other and do not come into contact with each other.

(Effects of the invention) As explained above, according to the invention, fitting holes are provided in the plate-shaped clip to fit into both flanges of both connecting pipes, engagement grooves are provided in both flanges, and By providing an engagement protrusion that engages with this engagement groove on the plate-shaped clip, it is possible to prevent both connection pipes from moving in the axial direction and relative rotation. There is no need to reposition the pipes during piping work and installation work, and both connecting pipes can be connected by one-touch operation of the plate-shaped clip, making it possible to simplify the installation work and reduce costs.

In addition, by forming the sides that contact the flange portions of the fitting hole of the plate-shaped clip into inclined surfaces corresponding to the respective flange portions, the connection ability through surface contact is increased and both flange portions are drawn together. Therefore, the connection between both connecting pipes can be made stronger.

Another advantage is that by forming the plate-like clip into an arbitrary shape depending on the outer diameter of the connecting pipe, the flange portion, etc., it is possible to sufficiently accommodate a wide variety of pipe connections.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the present invention, in which FIG. 1 is a sectional view taken along the - arrow in FIG. FIG. 3 is a perspective view of the plate-shaped clip, FIG. 4 is an enlarged sectional view showing the fitted state of the fitting hole and both flanges, and FIGS. 5 and 6 are the plate-shaped clips. FIGS. 7 and 8 are perspective views showing other embodiments of the clip and cross-sectional views showing the attached state thereof; FIGS. 7 and 8 are perspective views showing other embodiments of the plate-shaped clip;
The figure is an enlarged sectional view showing another embodiment of the fitting hole of the plate-shaped clip. 1, 2... Connection pipe, 1a, 2a... Flange portion, 1d, 2d... Engagement groove, 3, 8, 9, 10...
...plate-like clip, 5...fitting hole, 6...engaging protrusion.

Claims (1)

[Claims for Utility Model Registration] 1. The tip of one connecting tube is inserted into the other connecting tube, and both flanges provided on the outer periphery of the tip of both connecting tubes are clipped with a plate-shaped clip made of an elastic material. A pipe joint that connects both connecting pipes by means of the plate-shaped clip by fitting into a square fitting hole formed in the pipe, thereby engaging both the flanges with the sides of the fitting hole. In the device, the plate-shaped clip is bent into an arbitrary shape surrounding both of the flange portions, and engaging grooves are formed in both of the flange portions, and a groove is formed in both of the engaging grooves. A pipe joint device characterized in that the plate-shaped clip is provided with an engaging protrusion that engages. 2. The pipe joint device according to claim 1, wherein the side portions of the fitting hole provided in the plate-shaped clip that contact each of the flange portions are formed into inclined surfaces corresponding to the respective flange portions that contact each other. .