JPH0110544Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a joint, and more specifically to a joint that is easy to tighten, and is particularly suitable for use in ultra-low temperature pipe joints and other places where space is limited.

Conventionally, a so-called union type of joint has been used in which a joint flange is tightened by rotating a union nut that is loosely fitted into the joint flange. Generally, in this joint, the end surfaces of the first and second flanges of a pair of joint members that sandwich a sealing material and come into contact with each other are screwed into male threads provided on the outer circumferential surface of the first flange, and the end faces of the first and second flanges are screwed into male threads provided on the outer peripheral surface of the first flange. It is fitted and fastened by a union nut that engages with the second flange.

However, this type of joint has the disadvantage that it requires a large space for piping work and requires a large operating force because the cap nut must be rotated around the tube axis using a tool or the like.

Therefore, an object of the present invention is to provide a joint that eliminates the above-mentioned drawbacks.According to the present invention, in a joint of the type described at the beginning, a bearing is provided by a gear holder fixed to the first flange side joint member. The worm gear has a worm gear that meshes with a worm wheel provided on the outer peripheral surface of the union nut, and the worm gear has at least one end an engaging part for a tool that turns the worm gear, and the worm gear is connected to the worm gear through the engaging part. This is achieved by tightening the union nut by rotating the union nut.

The following is a joint 10 according to the present invention with reference to the attached drawings.
An example will be described. A pair of joint members 1
The end face 13a of the first flange 13 of No. 1, 12 and the second
An O-ring 15 made of a relatively soft metal such as indium or solder is held between the end surfaces 14a of the flange 14 as a sealing material.
4a are tightened together by a union nut 16 as will be described later.

A male thread 17 is cut on the outer peripheral surface of the first flange 13, and this male thread 17 is screwed into a female thread 19 of a sleeve portion 18 of a union nut 16 loosely fitted around the outer periphery of the second flange 14. The side end 20 of the union nut 16 extends from the sleeve portion 18 to the tube axis
It extends toward the outer peripheral surface of the pipe portion 12a of the joint 12 and engages with the rear end of the second flange. Second
A washer 21 is inserted between the flange 14 and the inside of the side end 20 of the union nut 16. On the contrary, a ring 22 is fitted on the outside of the side end 20 to prevent the union nut from coming off.

A worm gear holder 30 having an L-shaped cross section is attached to the outside of the first flange 13 with bolts 31 . This holder 30 has a vertical portion 30a perpendicular to the tube axis
Yoke portion 30 extending horizontally from above a
b, and the yoke portion 30b is the shaft 32
bearing for free rotation. A worm gear 33 is locked to the shaft 32 by a key 34, and the worm gear 33 meshes with a worm wheel 35 provided on the outer peripheral surface of the union nut 16. One end of the shaft 32 has an engaging part 32a for a tool, and the engaging part 32a has a screwdriver (not shown).
It has a roughly octagonal irregular cross section to facilitate rotation.

Since the worm gear 33 has the above-described structure, when a driver (not shown) is fitted into the engaging portion 32a and the shaft 32, that is, the worm gear 33 is rotated around the axis Y by the driver, the union is formed. Nut 16 rotates around tube axis X. For this reason, the union nut 16
The female thread 19 is the male thread 17 on the first flange 13.
It moves toward the first flange 13 in order to be screwed upward. Therefore, the second flange 14 is connected to the first flange 1.
3 side, both end surfaces 13a, 14
a is sealed and the joint can be connected. It should be noted that, with respect to the flange portion, the seal member, the shape of the abutting end surface, the shape of the union nut, etc., other than the features of the present invention, it is naturally possible to select and change the flange portion, the seal member, the shape of the abutting end surface, and the shape of the union nut from known ones according to the purpose.

The structure and operation of the present invention are as described above.
That is, the present invention has a simple structure in which a worm wheel is provided on a union nut, a worm gear that meshes with the worm wheel is integrally attached to a joint member, and this worm gear is provided with an engaging portion for turning the worm gear. The joint according to the present invention can be connected simply by rotating the screwdriver, so it does not require a large space for piping and has a large reduction ratio, making it easy to tighten the O-ring even with a small operating force. Yes, complete sealing is possible. The above-mentioned embodiment shows an example of a pipe joint for ultra-low temperature, but for general purposes, the sealing material and the contact portion can be changed depending on the purpose. Further, in this embodiment, the joint members 11 and 12 are integrally constructed as a part of the pipe, but the joint members can be further connected to the pipe by known means (welding, screwing, etc.).

[Brief explanation of the drawing]

FIG. 1 is a partial vertical cross-sectional view of a joint according to the present invention;
2 is a side view of the worm gear holder portion seen from the direction of arrow A in FIG. 1. FIG. 13...First flange, 14...Second flange, 16...Union nut, 30...Worm gear holder, 33...Worm gear, 35...Worm wheel.

Claims (1)

[Scope of utility model registration request] The first and second flange end surfaces of the pair of joint members that abut each other while sandwiching the sealing material are screwed into male threads provided on the outer peripheral surface of the first flange, and are loosely fitted around the second flange. A joint that is fastened by a union nut that engages with a flange, the worm gear having a worm gear that is supported by a gear holder fixed to the first flange side joint member and meshes with a worm wheel provided on the outer peripheral surface of the union nut. has an engaging part for a tool that turns the worm gear at least on one end,
A joint characterized in that a union nut is tightened by rotating the worm gear via the engaging portion.