JPH0534385U - Liquid pipe fittings - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a pipe joint in which a bellows pipe can be connected with one touch. [Structure] A joint body 3 connected to the main pipe 4 side, a mouthpiece 6 having an opening 10 connected to the joint body 3 and into which the outer circumference of the bellows pipe 2 is inserted as closely as possible, and the joint body 3 A ring-shaped packing member 17 which is fitted in the inside of the bellows tube 2 and has an inner diameter slightly larger than the outer diameter of the bellows tube 2 and whose end surface abuts on the collar portion 12 of the connecting end of the mouthpiece 6 via a packing retainer 18; 6
An elastic ring 13 formed by an elastic body such as a coil spring whose inner half can be fitted into the recessed section 2b on the outer periphery of the bellows tube 2 and which can be expanded. The elastic ring 1 on the inner periphery of the opening 10 of the base 6.
The outer peripheral half of 3 forms an annular recess 15 into which the elastic ring 13 can be fitted, and the end of the bellows tube 2 is inserted and pulled back from the opening 10 of the base 6 so that the elastic ring 13 causes the annular recess 1 of the base 6.
5 and the outer peripheral recessed line 2b of the bellows tube 2 are straddle-fitted so as to be retained.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pipe joint for a liquid pipe, and a pipe joint suitable for connecting a sprinkler.

[0002]

[Prior Art]

 When installing the sprinkler on the ceiling of the building, the bellows pipe on the side of the sprinkler is connected to the connecting part of the pipe in the ceiling.

Conventionally, a pipe joint having a structure as shown in FIG. 3 has been generally used for connecting such a bellows pipe. That is, a joint main body a connected to the main pipe, a ring packing c inserted at the inner end of an inner hole b penetrating in the axial direction of the main body a, and a waveform matching the concave line e on the outer periphery of the bellows pipe d. It is composed of two separate splits f, f having an inner peripheral surface, and a cap nut g screwed onto the outer periphery of the joint body a to tighten the splits f, f.

[0004]

[Problems to be solved by the device]

 However, in the above configuration, when the bellows tube d is connected, the cap nut g is fitted to the bellows tube d, the cutouts f, f are fitted at predetermined end portions, and then the fitting body a is fitted, and the bag nut is fitted. It is necessary to screw the joint g into the joint body a and then tighten it with a tool. Therefore, the connection work is complicated, and it is not easy to connect from the bottom side at the ceiling of the building like a sprinkler, and there is a problem that workability deteriorates and work efficiency decreases.

The present invention has been made in view of the above circumstances and an object thereof is to provide a pipe joint for a liquid pipe, which can connect a bellows pipe with one touch, and which does not come off after being connected once and does not leak water. It is a thing.

[0006]

Means for Solving the Problems In order to solve the problems of the above-mentioned conventional techniques, the present invention provides a joint main body connected to the main pipe side and an outer circumference of a bellows pipe connected to the joint main body. A mouthpiece having an opening that is inserted tightly and an inner diameter slightly larger than the outer diameter of the bellows tube that is fitted into the joint body, and the end face has a packing retainer on the collar of the connecting end of the mouthpiece. A ring-shaped packing member that comes into contact with the inner surface of the mouthpiece and an elastic body such as a coil spring that can be expanded in the inner peripheral half of the bellows pipe and is fitted into the inner peripheral recess of the collar. An elastic ring, and an annular recess into which the outer half of the elastic ring can be fitted is formed on the inner circumference of the opening of the base, and the end of the bellows tube is inserted and pulled back from the opening of the base. This allows the elastic ring to straddle the annular recess of the base and the outer peripheral recess of the bellows pipe. Characterized in that the so that-fitted retaining Te.

[0007]

[Action]

 When the tube end of the bellows tube is inserted through the opening of the base, the tip of the bellows tube fits into the elastic ring, and if it is pressed firmly, the ridges of the bellows tube enter while expanding the elastic ring. When the bellows tube is pulled back after being inserted to the deepest end, the elastic ring that fits into the outer peripheral groove of the bellows tube is pulled back until it fits into the outer peripheral groove of the bellows tube, and the outer peripheral half of the elastic ring is pulled back. The portion fits into the annular recess of the base, and even if it is pulled back further, the elastic ring fits over the outer peripheral recess of the bellows tube and the annular recess of the base, so that the bellows tube is connected in a non-pullable manner. Since the pressure of the liquid in the joint body acts on the outer peripheral surface of the ring-shaped packing member, this packing member is pressed against the collar portion of the mouthpiece and the outer surface of the bellows tube to prevent liquid leakage. When it is necessary to remove the bellows tube, the bellows tube together with the mouthpiece can be removed from the joint body by removing the mouthpiece from the joint body.

[0008]

【Example】

 Hereinafter, the present invention will be described with reference to the embodiments shown in the drawings.

FIG. 1 shows an embodiment of a pipe joint 1 according to the present invention. In FIG. 1, the upper half shows a cross-section when the bellows tube 2 is inserted to the innermost part, and the lower half shows The cross section of the bellows tube 2 is slightly pulled back to prevent it from coming off.

The joint body 3 has a screw 5 at the base for screwing it into the main pipe 4 to attach it, and a screw 7 for connecting a base 6 to the outer periphery on the tip side. The inner hole 8 penetrates from the tip to the base end, and the intermediate position of the inner hole 8 has a small diameter, and the tip hits the step portion 9 formed by this when the bellows tube 2 is inserted. It has become like this.

The base 6 has an opening 10 through which the bellows tube 2 can be inserted as tightly as possible, and a screw 11 that is screwed into a screw 7 on the joint body 3 side is engraved at the base end. A collar portion 12 facing the tip surface of the joint body 3 is formed in the inner depth of the portion where the screw 11 is formed, and a storage recess 14 for the elastic ring 13 is formed in the inner peripheral portion of the collar portion 12. Has been done. The elastic ring 13 is formed by winding a coil spring in an annular shape. However, the elastic ring 13 may be made of any other material as long as it can expand the diameter so as to get over the ridge 2a on the outer circumference of the bellows tube 2.

An annular recess 15 into which the outer peripheral half of the elastic ring 13 can be fitted is formed on the inner peripheral surface closer to the tip than the housing recess 14 in which the elastic ring 13 is housed. A tapered surface 16 is connected to the storage recess 14 so that the expanded elastic ring 13 does not hinder the transfer to the annular recess 15. When the elastic ring 13 is fitted over the annular concave portion 15 and the concave groove 2b on the outer circumference of the bellows tube 2, the convex groove 2a on the outer circumference of the bellows tube 2 cannot pass through the inner circumference of the elastic ring 13. Is configured.

Inside the inner hole 8 of the joint body 3, a ring-shaped packing member 17 made of an elastic material such as rubber and having an inner diameter that allows the bellows tube 2 to be inserted as closely as possible is installed. The rising portion 17a at the end of the packing member 17 is opposed to the collar portion 12 of the mouthpiece 6 with the packing retainer 18 interposed.

Next, the operation of the above embodiment will be described.

The joint body 3 is connected to the main pipe 4 by the screw 5, and the ring-shaped packing member 17, the packing retainer 18, and the elastic ring 13 are housed at the tip of the joint body 3 and the base 6 is screwed in for connection. I'll do it.

When the end of the bellows tube 2 is inserted into the opening 10 of the mouthpiece 6 set in this way in the direction of arrow A in FIG. 1, it is inserted each time the ridge 2 a on the outer periphery passes through the elastic ring 13. When the elastic ring 13 is pushed and expanded, the diameter of the elastic ring 13 is expanded in the accommodating concave portion 14 of the mouthpiece 6 to allow passage of the ridge 2a. In this way, the tip of the bellows tube 2 reaches the step 9 of the inner hole 8 of the joint body 3 (the state of the upper half of FIG. 1).

After that, when the bellows tube 2 is pulled back in the direction of the arrow B in FIG. 1, the elastic ring 13 fitted in the recess 2 b on the outer periphery of the bellows tube 2 is pulled back together with the bellows tube 2, and the elastic ring 13 is pulled back. Moves from the accommodating recessed portion 14 along the tapered surface 16, the outer peripheral side half portion thereof is fitted into the annular concave portion 15 and the inner peripheral side half portion thereof is fitted over the outer peripheral concave line 2b of the bellows tube 2 (see FIG. 1). The state of the lower half).

As a result, the bellows tube 2 is connected in a state in which it cannot be pulled out in the direction of arrow B. Further, hydraulic pressure from the main pipe 4 side flows from the inner hole 8 of the joint body 3 to the bellows pipe 2, and at that time, between the outer peripheral surface of the ring-shaped packing member 17 and the inner peripheral surface of the inner hole 8 of the joint member 3. Since the back pressure is applied to the packing member 17, the inner peripheral surface of the packing member 17 is crimped to the outer peripheral surface of the bellows tube 2, and liquid leakage along the outer peripheral surface of the bellows tube 2 is prevented.

When it is necessary to remove the bellows tube 2, the mouthpiece 6 and the bellows tube 2 are detached from the joint body 3 by removing the mouthpiece 6 from the joint body 3.

[0020]

[Effect of the device]

 As described above, according to the present invention, the bellows tube can be connected without being pulled out by simply inserting the end of the bellows tube into the opening of the mouthpiece and pulling it back a little. It can be performed with one touch without using a tool, and thus the workability can be remarkably improved. Moreover, since the number of parts is small, it is easy to manufacture, and since the sealing is performed by utilizing the liquid pressure, there are various excellent effects such as no liquid leakage.

[Brief description of drawings]

FIG. 1 shows an embodiment of a pipe joint according to the present invention,
Sectional drawing which shows the bellows tube insertion in the upper half part, and shows the bellows tube withdrawal in the lower half part.

FIG. 2 is an explanatory view showing an example of piping.

FIG. 3 is a cross-sectional view showing a conventional joint.

[Explanation of symbols]

 1 pipe joint 2 bellows pipe 2a convex line 2b concave line 3 joint body 4 main pipe 6 base 8 inner hole 9 step 10 opening 12 collar 13 elastic ring 14 storage recess 15 annular recess 17 ring-shaped packing member 18 packing retainer

Claims (1)

[Scope of utility model registration request] 1. A joint main body connected to the main pipe side, a mouthpiece connected to the main joint body and having an opening into which the outer circumference of the bellows pipe is inserted as closely as possible, and a bellows internally fitted to the joint main body. A ring-shaped packing member having an inner diameter slightly larger than the outer diameter of the pipe and having an end surface abutting on the flange portion at the connecting end of the mouthpiece via a packing retainer, and fitted in a recess on the inner circumference of the mouthpiece flange portion. An elastic ring formed by an elastic body such as a coil spring whose inner peripheral half can be fitted into the outer peripheral groove of the bellows tube and which can be expanded, and the outer peripheral half of the elastic ring is formed inside the opening of the mouthpiece. A ring-shaped recess that can be fitted is formed, and by inserting and pulling back the end of the bellows tube from the opening of the mouthpiece, the elastic ring is fitted over the ring-shaped recess of the mouthpiece and the outer peripheral groove of the bellows tube. A pipe joint for liquid piping, characterized in that