JPH0519782U - Union joint for pipe connection - Google Patents

Abstract

(57) [Summary] [Purpose] The O-ring is easily set in the proper position and in the correct posture, and therefore a union joint for pipe connection with excellent work efficiency and reliability is achieved. A collar 02 protruding from an end of a pipe 01, an O-ring outer fitting pipe portion 2 coaxially fixed to the front end of the collar 02 and having the same outer diameter as the pipe 01, and an O-ring outer fitting pipe portion. 2 and a large-diameter pipe portion 4 coaxially fixed to the front end of the pipe 2 and having an gradually increasing outer diameter, and a large-diameter pipe portion 4 coaxially fixed to the front end of the enlargement pipe portion 3 and having an outer diameter larger than that of the pipe 01. In a pipe connecting union joint having a male side end portion 1 made of
O-ring 03 fitted to the O-ring external fitting tube 2
Thickness t ₀ or less.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a union joint for connecting pipes.

[0002]

[Prior Art]

Conventionally, for example, as shown in the longitudinal sectional view of FIG. 4, as a male side end portion of a pipe connecting union joint, a union collar 02 projecting from the front end portion of a pipe 01 and an O-shaped joint fixed to the front end of the union collar 02 are provided. The O-ring outer fitting pipe portion 04 having a length l ₀₁ which is about three times the thickness t ₀ of the ring 03, the expanding pipe portion 05 fixed to the front end of the O ring and having the outer diameter gradually increasing, and fixed to the front end thereof. A large diameter tube portion 06 having a diameter larger than the outer diameter of the pipe 01 is widely used. As shown in the vertical cross-sectional view of FIG. 5, this type of male side end has a union screw 08 projecting from the rear end of the tube 07 and is screwed to the female side end via a union nut 09. .. Here, 010 is the O-ring contact surface of the screw 08, and this length l ₀₂ is about twice the thickness t ₀ of the O-ring 03.

However, in such a structure, the O-ring fitting space 011 formed by the O-ring outer fitting tube portion 04 and the O-ring contact surface 010 of the screw 08 is smaller than the thickness t ₀ of the O-ring 03. Since there is too much room, there are the following drawbacks. (1) There is a risk that the O-ring 03 will be displaced from the predetermined position at the O-ring outer fitting pipe portion, which makes setting the O-ring troublesome, and therefore the work efficiency is reduced. (2) For example, as shown by the broken line in FIG. 5, the upper part of the O-ring 03 should be separated from the front surface of the collar 02, be caught in the expansion pipe portion 05, and be twisted as a whole and be pressed in a normal shape. Therefore, there is a risk of fluid leakage.

[0004]

[Problems to be solved by the device]

 The present invention has been proposed in view of such circumstances, and provides a union joint for pipe connection in which the O-ring can be easily set in a proper position and in a correct posture, and thus has excellent work efficiency and reliability. The purpose is to

[0005]

[Means for Solving the Problems]

 To this end, the present invention provides a collar or flange projecting from the end of the pipe, an O-ring external fitting pipe portion coaxially fixed to the front end of the collar or flange, and having an outer diameter identical to that of the pipe. An O-ring outer fitting pipe portion has an enlarged pipe portion coaxially fixed to the front end thereof and the outer diameter gradually increasing, and an O-ring outer fitting pipe portion coaxially fixed to the front end of the enlargement pipe portion and having an outer diameter larger than the outer diameter of the pipe. In a pipe joint union joint having a male side end portion made of a large-diameter pipe portion, the length of the O-ring external fitting pipe portion is equal to or smaller than the thickness of the O-ring fitted in the O-ring external fitting pipe portion. It is characterized by the bottom.

[0006]

[Action]

 According to such a configuration, the following actions are performed. (1) A collar or flange protruding from the end of the pipe, an O-ring external fitting pipe portion coaxially fixed to the front end of the collar or flange and having the same outer diameter as the pipe, and the O-ring outside An enlarged pipe portion that is coaxially fixed to the front end of the fitting pipe portion and gradually increases the outer diameter, and a large-diameter pipe portion that is coaxially fixed to the front end of the enlargement pipe portion and has an outer diameter larger than the outer diameter of the pipe. Since the male side end portion made up of the O-ring is provided, there is no fear that the O-ring will be displaced from the predetermined position in the O-ring external fitting pipe portion. (2) Since the length of the O-ring external fitting pipe portion is set to be equal to or less than the thickness of the O-ring fitted in the portion, the O-ring can be reliably set in the portion.

[0007]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. The same reference numerals as those in FIGS. 4 to 5 respectively denote the same members, and first, in the longitudinal sectional view of FIG. 1, 1 is a front end of a pipe 01. And a thickness t of the O-ring 03 which is coaxially fixed to the front end of the collar 02. ₀ The length l₁An O-ring external fitting pipe portion 2 having the same diameter as the pipe 01, an enlarged pipe portion 3 coaxially fixed to the front end and gradually increasing in outer diameter, and an external fitting pipe portion coaxially fixed to the front end and larger than the outer diameter of the pipe 01. It is a male side end portion of a union joint including a large diameter pipe portion 4 having a large diameter.

In such a structure, the male side end portion 1 as shown in FIG. 1 is inserted into the screw 08 projecting from the rear end portion of the pipe 07 as shown in the vertical sectional view of FIG. Is screwed onto the screw 08, and the nut 09 is tightened, so that the collar 02 is pressed against the end surface of the screw 08 and the O-ring 03 is crimped between the O-ring outer fitting tube portion 2 and the inner diameter of the screw 08. , The gap between the male side end 1 and the female side end of the union joint is sealed. Next, FIG. 3 is a longitudinal sectional view showing a modification of the male side end portion 1. The male side end portion 6 has a flange 7 projecting from the front end of the pipe 01 and a pipe 01 coaxially fixed to the front end. An O-ring external fitting pipe portion 8 having the same diameter and a length of about the thickness of the O-ring 03, an expansion pipe portion 9 coaxially fixed to the front end, and a large diameter pipe coaxially fixed to the front end. The flange 7 to the large-diameter pipe portion 10 are formed integrally with each other by machining.

According to the structures of the embodiments and the modified examples, the following effects can be obtained. (1) A collar or flange protruding from the end of the pipe, an O-ring external fitting pipe portion coaxially fixed to the front end of the collar or flange and having the same outer diameter as the pipe, and the O-ring outside An enlarged pipe portion that is coaxially fixed to the front end of the fitting pipe portion and gradually increases the outer diameter, and a large-diameter pipe portion that is coaxially fixed to the front end of the enlargement pipe portion and has an outer diameter larger than the outer diameter of the pipe. Since the male side end of the O-ring is provided, there is no fear that the O-ring will be displaced from the predetermined position in the O-ring external fitting pipe portion, and therefore the O-ring can be easily set and the work efficiency is improved. (2) Since the length of the O-ring external fitting pipe is set to be equal to or less than the thickness of the O-ring fitted in the O-ring, the O-ring is reliably set on the O-ring, so that the O-ring can be reliably attached to the O-ring. The risk of fluid leakage is eliminated and the reliability of the joint is improved.

[0010]

[Effect of the device]

 In short, according to the present invention, a flange or a flange projecting from the end of the pipe, and an O-ring fitting pipe portion coaxially fixed to the front end of the flange or the flange and having the same outer diameter as the pipe, The O-ring outer fitting pipe portion has an enlarged pipe portion coaxially fixed to the front end thereof and the outer diameter gradually increasing, and an outer diameter larger than the outer diameter of the pipe fixed coaxially to the front end of the enlarged pipe portion. In a pipe joint union joint including a male side end portion including a large-diameter pipe portion, the length of the O-ring external fitting pipe portion is set to be equal to or less than the thickness of the O-ring fitted in the O-ring external fitting pipe portion. By doing so, the O-ring can be set in a proper position easily and in a correct posture, and thus a union joint for pipe connection having excellent work efficiency and reliability can be obtained. Therefore, the present invention is extremely useful in industry. Is.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a male side end portion of an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing a state in which the male side end portion of FIG. 1 is connected to the female side end portion.

FIG. 3 is a vertical sectional view showing the modification of FIG.

FIG. 4 is a longitudinal sectional view showing a male side end portion of a known pipe joint union joint.

5 is a vertical sectional view showing a state in which the male side end portion of FIG. 4 is connected to the female side end portion. FIG.

[Explanation of symbols]

1 Male-side end 2 O-ring external fitting pipe 3 Large expansion pipe 4 Large diameter pipe 6 Male side end 7 Flange 8 O-ring external fitting pipe 9 Expansion pipe 10 Large diameter pipe 01 Pipe 02 Flange 03 O Ring 07 Tube 08 Screw 09 Nut l ₁ Length t ₀ Thickness

Front page continued (72) Inventor Kazuo Ishii 3-1, Asahi-cho, Nishibiwajima-cho, Nishikasugai-gun, Aichi Prefecture Mitsubishi Heavy Industries, Ltd. Air-Conditioning Works (72) Creator Mitsuaki Arita 60, Kutani, Iwatsuka-cho, Nakamura-ku, Nagoya Address No. 1 Nakanishi Engineering Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A flange or a flange projecting from an end of a pipe, an O-ring external fitting pipe portion coaxially fixed to the front end of the flange or the flange and having the same outer diameter as the pipe, and the O-ring. An enlarged pipe portion that is coaxially fixed to the front end of the outer fitting pipe portion and has an gradually increasing outer diameter, and a large-diameter pipe that is coaxially fixed to the front end of the enlargement pipe portion and has an outer diameter larger than the outer diameter of the pipe. In the union joint for pipe connection having a male side end portion formed of a portion, the length of the O-ring outer fitting pipe portion is set to be equal to or less than the thickness of the O-ring fitted in the O-ring outer fitting pipe portion. Characteristic pipe joint union joint.