JPH0518551Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a thin-walled pipe joint for water supply.

Conventional technology and its problems Figures 1 and 2 show examples of conventional thin-walled water pipe joints. Loosely fit the ring,
Thin-walled tube A is inserted into main body D to an appropriate position, and tightened with a wrench to tighten the nut and main body D, compressing tube C and compressing and deforming thin-walled tube A to prevent it from slipping out.

The one shown in Fig. 2 is from Utility Application No. 176,728/1986 and was written by the same person as the applicant, but it has a thin-walled tube A with a nuturo and a ring C loosely fitted, and a reinforcing cylindrical body at the end of the thin-walled tube. and insert it for a predetermined length into the joint body which has a male thread on the outer periphery and has a sealing member inside, and screw the nut to the joint body,
The thin-walled tube is compressed and deformed to prevent it from slipping out. However, in the case of the one shown in Figure 1, when the water inside the pipe freezes in a cold region, the pressure acting inside the pipe causes the pipe to slip out of the joint, making it impractical. In addition, the seal shown in Figure 2 has the disadvantage that part of the sealing member may break off when the thin-walled tube is inserted, resulting in a loss of sealing performance, and that only the reinforcing cylinder cannot be reused when the thin-walled tube is replaced. Ta.
The present invention is a thin-walled water pipe joint designed to solve the above-mentioned problems.

Technical means to solve the problem The present invention screws together the male threaded part of the thin-walled water pipe and the male threaded member located on the outer periphery with the female threaded part provided on the inner periphery of one end or both ends of the joint body. A portion of the outer circumferential surface near the tip of the thin-walled pipe can be brought into close contact with a sealing member and a sealing member pressing ring arranged on the inner circumferential side of the joint body, and the portion of the outer circumferential surface near the tip of the thin-walled water pipe An annular recess is provided at a position away from the annular recess, and a relatively thin reinforcing cylinder is inserted into the tip of the thin-walled water pipe until the stepped portion abuts the inner surface of the annular recess. This is a thin-walled pipe joint for water supply in which an elastic ring with an end portion cut off is attached to the outer circumferential surface of the pipe, and can be controlled by the inner circumferential surface of the male screw member.

Next, embodiments of the present invention will be described based on the drawings. FIG. 3 shows an embodiment of the present invention, and since the joints are symmetrical in the drawing, only one will be explained. A reinforcing cylinder 3 is installed into the thin-walled tube 1 from the end of the thin-walled tube 1, which has an annular recess 2 provided in advance near the tip. a small outer diameter portion 4 that is in contact with the smallest inner diameter portion of pipe 2; and a middle outer diameter portion 5 that is approximately equal to the inner diameter of the thin-walled tube.
A large outer diameter portion 6 is formed, which is smaller than the outer diameter of the thin-walled tube and larger than the inner diameter, so that the terminal outer periphery 7 of the middle outer diameter portion 5 is in contact with the inner diameter end of the annular recess 2. A female threaded portion 9 of the joint body 8 is screwed into a male threaded portion 9' of a male threaded member 10 that loosely fits into the thin-walled pipe 1.
A portion of the inner side of the male screw member 10 has a tapered surface 11 on which the outer peripheral surface of the elastic ring 12 whose end is cut off slides, and an inner wall 13 that restricts the outer peripheral surface. Further, a seal member 14 and a seal member pressing ring 15 are installed inside the joint body 8, and when the male screw member 10 is screwed together, the seal member pressing ring 15
is pressed, and the sealing member 14 is compressed and brought into close contact with the thin-walled pipe 1 and the joint body 8.

Next, the effects of the present application will be explained. The joint body according to the present invention is assembled as shown in FIG. 14, the inner diameter of each of the sealing member pressing ring 15, the elastic ring 12, and the male screw member 10 is formed to be approximately equal to the outer diameter of the thin-walled tube 1. An annular recess 2 is formed near the tube end of the thin-walled tube 1, and a reinforcing cylinder 3 is further inserted inside the tube end in which the annular recess 2 is formed in the assembled forming body. insert.
By screwing in the male screw member 10, the elastic tube 12 slides on the tapered surface 11 and fits into the annular recess 2. In addition, the outer peripheral surface of the elastic ring 12 that has become stuck is prevented from returning to the outside by the inner wall 13 of the male screw member 10. After the seal member pressing ring 15 comes into contact with one end of the male screw member 10, the seal member 14 is compressed to the extent that the threaded portions 9, 9' are screwed in, thereby increasing the sealing performance. As other embodiments, it is also possible to reverse the male and female threads of the threaded part, or to form the reinforcing cylinder into a simple cylinder with an outer diameter approximately equal to the inner diameter of the thin-walled tube. be.

As described above, the thin-walled water pipe joint of the present invention does not cause damage to the sealing member that occurs when inserting the thin-walled pipe into the joint body, does not require disassembling and reassembling the joint body, and is easy to replace the thin-walled pipe. Also, all of the joint parts can be reused, and it is possible to provide a thin-walled water pipe joint for use in cold regions that can solve the drawbacks of the above-mentioned thin-walled water pipe joints.

[Brief explanation of drawings]

1 and 2 are sectional views of a conventional embodiment, and FIGS. 3 and 4 are sectional views of an embodiment of the present invention. 1 is a thin-walled water pipe, 2 is an annular recess, 3 is a reinforcing cylinder, 8 is a joint body, 10 is a male thread member, 12 is an elastic ring, 14 is a seal member, 15
1 and 2 respectively indicate sealing member pressing rings.

Claims (1)

[Scope of utility model registration request] A joint body having a female threaded portion at its tip, a male threaded member that screws and presses a sealing member and a sealing member pressing ring housed inside the fitting body onto the female threaded portion, and an outer diameter that fits into the male threaded member, A thin-walled water pipe whose tip outer circumferential portion is in close contact with the sealing member and which has an annular concave portion recessed approximately semicircularly around the entire circumference at its rear portion, and which is attached to the outer circumferential surface of the annular concave portion and is attached to the inner surface of the male screw member. It has an elastic ring whose end is cut off and is regulated by the circumferential surface, a small diameter whose tip fits into the annular recess, and a large diameter which fits into the thin-walled water pipe at the rear, and a step formed between the two. A thin-walled water pipe joint consisting of a reinforcing cylindrical body that abuts an annular recess.