JPH0223918Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial application field] This invention is applicable to the outlet pipe of a valve installed in a high-pressure gas cylinder filled with gases such as oxygen, nitrogen, argon, carbon dioxide, etc. This invention relates to a high-pressure gas connector that removably connects a gas pipe connected to a gas pipe using a cap nut, and particularly to a rotation mechanism of the cap nut.

[Conventional technology]

The one shown in FIGS. 3 and 4 is a conventional one. Reference numeral 1 in FIG. 4 is an outlet pipe protruding from a valve of a gas cylinder (not shown), and a male screw 2 is provided at the tip of the outlet pipe.

3 is a gas pipe installed in a factory, etc., and a large-diameter connection 4 is attached to the tip by welding or hard brazing.
However, prior to attaching the connecting portion 4, a cap nut 5 is attached to the gas pipe 3 so as to be movable and rotatable.

Further, a protrusion 6 is formed at the tip of the connecting portion 4 to fit into the opening at the tip of the outlet pipe 1, and an O-ring 7 for airtightness is attached to a groove on the outer periphery of the base of the protrusion 6.

In the case of the above structure, if the cap nut 5 is screwed into the male thread 2 and this nut 5 is tightened with a spanner,
The gas pipe 3 can be connected to the outlet pipe 1, but the following structure eliminates the need for a spanner.

8 is a cylindrical grip, and this grip 8 is also fitted into the gas pipe together with the cap nut 5. Further, a cylindrical portion 9 that covers the outside of the cap nut 5 is integrally provided at the tip of the grip 8.

Since this conventional grip 8 is a cast product made of aluminum, it is impossible to make the inner surface of the cylindrical part 9 into a highly accurate polygon during casting, and the cylindrical part 9 is not machined after casting. There was a problem that if the inner surface was finished in a polygonal shape, the manufacturing cost would be too high.

For this purpose, the inner surface of the cylindrical portion 9 is machined using a lathe to form a cylindrical surface.

Since the inner diameter of the cylindrical portion 9 is larger than the maximum diameter on the outside of the cap nut 5, it rotates freely on the outside of the cap nut 5. Therefore, a plurality of screw holes are provided in the cylindrical portion 9, and a set screw 10 is inserted into each screw hole.
is screwed in, and its tip is pressed against the outer surface of the cap nut 5 as shown in FIG. 4, thereby joining the grip 8 and the cap nut together.

With this configuration, the gas pipe 3 is connected to the outlet pipe 1.
When connecting, the connection can be made by simply turning the grip 8 by hand and screwing the cap nut 5 onto the male thread 2 without using a wrench. Also, when loosening, do the opposite operation when tightening.

Further, the conventional examples shown in FIGS. 5 and 6 are also made of the same material as the above-mentioned conventional example, and the inner surface of the cylindrical portion 9 is a cylindrical surface. 15 is integrally provided, a horizontal hole 16 is provided in this protruding portion 15, the intermediate portion of this horizontal hole 16 is communicated with the inside of the cylindrical portion 9, and a pin 17 is press-fitted into the horizontal hole 16 and fixed by caulking at both ends. A portion of the pin 17 is exposed inside the cylindrical portion 9 as shown in FIG.
The operation and effect are similar to the conventional examples shown in FIGS. 3 and 4.

[Problem that the invention attempts to solve]

In the conventional example shown in FIGS. 3 and 4 above, the cylindrical portion 9 of the grip 8 and the cap nut 5 are connected by a set screw 10, so the set screw 10 must be turned during connection and separation. This is troublesome, and since it is a cast product, it is easily damaged.

In the case of the conventional examples shown in FIGS. 5 and 6, it takes time and effort to attach the pin 17 to the horizontal hole 16, and the side surface of the pin 17 only engages with a part of the flat surface of the cap nut 5. There is a risk of slipping between the cap nut 5 and the pin 17, and if such slipping occurs, it will no longer be possible to use it.

In addition, in any of the above conventional examples, the grip 8
Since the gas pipe 3 is directly attached to the gas pipe 3 piped to a factory, etc., if the engagement part between the grip 8 and the cap nut 5 or any other part is damaged, the entire gas pipe 3 may need to be replaced. There's a problem.

[Means for solving problems]

In order to solve the above problem, this invention has a male thread at the rear end that screws into the female thread provided at the tip of the gas pipe, and a cap nut that can be rotated, moved forward and backward, and detached. Attach a cylindrical grip, and fit a cap nut into the polygonal inner surface of the cylindrical portion at the tip of this grip in a non-rotatable manner, so that the large diameter portion at the tip of the relay pipe can freely rotate within the cap nut. A protrusion is provided that is removably fitted into the outlet pipe from the large diameter portion, and an O-ring for airtightness is fitted around the outer periphery of the base of the protrusion.

[Effect]

In the case of this device, the grip is attached to the gas pipe by screwing the rear end of the relay pipe into a female thread provided at the tip of the gas pipe. Then, by screwing the cap nut fitted into the tip of the grip onto the male thread of the outlet pipe protruding from the valve of the gas cylinder and rotating the grip, the cap nut is screwed into the male thread. The cap nut is fully screwed in. If you want to remove the cap nut, just do the opposite operation.

In addition, if the engaging part between the grip and the cap nut is damaged and the grip needs to be replaced, remove the male screw at the rear end of the relay pipe from the female thread of the piping gas pipe, and the grip or cap nut will be replaced. It can be easily removed from the rear end of the tube.

(Example) In FIGS. 1 and 2, reference numeral 21 denotes a cylindrical grip with unevenness on the outer periphery, and the inner surface 23 of the cylindrical portion 22 at the tip thereof is a polygon that fits the outer surface of the cap nut 5. It's summery.

24 is a relay pipe with a male thread 25 at its rear end;
A large diameter portion 26 that rotatably fits into the cap nut 5 is provided at the tip.

A protrusion 27 is formed at the tip of the large diameter portion 26 of the relay pipe 24 to fit into the opening at the tip of the outlet tube 1, and an O-ring 2 for airtightness is inserted into a groove on the outer periphery of the base of the protrusion 27.
Install 8.

29 in FIG. 1 is a female thread provided at the tip of a gas pipe 3 installed in a factory, etc., and a male thread 2 of the relay pipe 24.
5 is screwed in.

In this embodiment, the cap nut 5, the grip 2
1 into the female thread 29 of the gas pipe 3. At this time, an appropriate sealant is applied to the male thread 25, and a spanner is applied to the rear engagement portion of the relay pipe 24 to tighten it so as not to loosen it. However, the relay pipe 24 may be provided with a female thread, and the gas pipe 3 may be provided with a male thread. After that, hold the grip 21 and tighten the cap nut 5 to the male thread 2 of the outlet pipe 1.
Screw in and tighten.

〔effect〕

This idea allows the grip to be attached to a gas pipe by fitting a relay pipe into the grip as described above, and screwing the male thread at the rear end of this relay pipe into the female thread at the tip of the gas pipe installed in a factory. Therefore, it is easy to attach the grip to the gas pipe, and when the grip needs to be replaced, simply remove the male thread at the rear end of the relay pipe from the female thread of the gas pipe, and the grip or cap nut can be removed from the relay pipe. Since it can be easily removed and the relay pipe can also be removed, necessary parts can be easily replaced without leaving the gas pipe as is.

Furthermore, since the cap nut is separate from the grip, the nut can be tightened by repeatedly rotating the grip back and forth, making the tightening operation easier and making it easier to work in narrow spaces. Additionally, there is no need to perform troublesome thread cutting on the grip.

Furthermore, the grip is machined from a strong duralumin round bar, and the inner surface of the cylindrical part is shaped into a highly accurate polygon, such as a hexagon, using an automatic machine tool such as a machining center to match the outside diameter of the cap nut. Since the grip is made of a polygonal surface, there is no risk of slipping between the grip and the cap nut, and since the cap nut is tightened using a polygonal surface, the torque is distributed to each surface. This has the effect that there is no risk of cracking.

[Brief explanation of drawings]

Figure 1 is a longitudinal sectional side view of the connector of this invention.
Fig. 2 is an exploded perspective view of the same as the above, Fig. 3 is a perspective view of the conventional example, Fig. 4 is a vertical cross-sectional side view of the same as the above, Fig. 5 is a perspective view of another conventional example, and Fig. 6 is a longitudinal cross-section of the same as the above. It is a front view. DESCRIPTION OF SYMBOLS 1... Outlet pipe, 3... Gas pipe, 5... Cap nut, 21... Grip, 22... Cylindrical part, 23...
...Inner surface, 24...Relay pipe, 25...Male thread, 26
...Large diameter part, 27...Protrusion, 28...O ring,
29...Female thread.

Claims (1)

[Scope of utility model registration request] The outlet pipe of the valve installed in the high-pressure gas cylinder and the piping gas pipe are removably connected with a cap nut, and a cylindrical grip that rotates the cap nut is rotatably attached to the gas pipe. In a gas connector, the outside of the relay pipe, which has a male thread at the rear end that screws into the female thread provided at the tip of the gas pipe, is equipped with a cap nut that can rotate, move forward and backward, and be detachable, and a round bar made of duralumin. At the same time, a cap nut is fitted into the polygonal inner surface of the cylindrical portion at the tip of this grip so that the large diameter tube at the tip of the relay tube can be rotated into the cap nut. A high-pressure gas connector that is provided with a protrusion that can be freely fitted into the outlet pipe from the large diameter portion and detachably fitted into the outlet pipe, and an O-ring for airtightness is fitted on the outer periphery of the base of the protrusion.