JPS5919188Y2 - pipe fittings - Google Patents

Description

[Detailed description of the invention] This invention relates to the improvement of pipe joints used mainly for fire pipes installed on the upper deck of ships, and is designed to be used even when exposed to high heat for long periods of time or left unused for long periods of time. The purpose of this invention is to provide a pipe joint that does not deteriorate its sealing performance even when it is closed or closed, and can be supplied at a low price.

Conventionally, when dresser-type pipe joints are used in so-called fire extinguishing pipes that convey water for fire extinguishing, the backing is made of rubber, so when exposed to high heat, the rubber backing burns out and the sealing performance deteriorates. There is a drawback that the amount of water decreases and eventually water supply becomes impossible.

For this reason, with regard to fire pipes installed on the upper deck of a ship, due to the revision of the International Law of the Sea, pipe joints with the above-mentioned structure are no longer permitted to be used.

Under this revised International Law of the Sea, sliding sleeve type pipe fittings that use asbestos backing are allowed to be used, but asbestos backing deteriorates in sealing performance over time, so it is necessary to replace the backing frequently. This not only requires time and effort for maintenance, but also has the drawback of increasing maintenance and management costs due to the high price of asbestos backing.

By adopting the configuration described in the claims for utility model registration, the present invention is inexpensive and uses a rubber backing that can maintain perfect sealing performance over a long period of time, while maintaining sealing performance even when exposed to high heat for a long time. This provides a pipe joint that does not cause a decrease in

The configuration of the illustrated example will be described below.

FIG. 1 is a half-cut sectional view of the first embodiment, in which the other connected tube end is connected to the flange 2 of one connected tube end 1 by a flange 3, and is fixed in a joint mantle 4. 5 is connected to the flange 6 by the flange 7, and the pipe included in the joint 8 is fixed.
is slidably inserted, and a rubber backing 11 is provided between the inner circumferential surface 9 of the joint outer tube 4 and the outer circumferential surface 10 of the joint inner tube 8.
and 12 groups of asbestos backing.

The aforementioned rubber backing 11 is attached to the inner peripheral surface 9 of the joint mantle tube 4.
It is an annular backing with a U-shaped cross section that is installed in an interior recess 14 that is an annular groove provided at a position recessed from the opening end 13 of the backing, and as shown in FIG. The expanded portion is elastically deformed into a U-shaped cross section, and is press-fitted between the interior recess 14 and the outer circumferential surface 10 of the joint inner mantle tube 8.

The above-mentioned group of asbestos backings 12 is an annular body installed in an interior notch 15 which is an annular groove formed in a step-like manner in a portion continuous with the open end 13 of the inner circumferential surface 9 of the joint mantle tube 4. The backing is press-fitted into the interior notch 15 by an annular pressing body 18 screwed onto the open end surface of the joint mantle 4 with a bolt/nut 17, and the interior notch 15 and the joint inner mantle 8 It is brought into close contact with the outer peripheral surface 10 of.

Interior recess 14 in which the above-mentioned rubber backing 11 is placed
An annular fluid reservoir 21 is formed in the interior 19 of the joint jacket tube 4 surrounding the pipe joint, which communicates with a fluid passage 20 within the pipe joint.

The fluid storage chamber 21 in the illustrated example has a shape that surrounds the interior recess 14 from its outer circumferential side and from both front and rear sides, and a rubber backing having a U-shaped cross section is formed by a notch 22 provided in the interior 19. The fluid reservoir chamber 21 may have any shape as long as it surrounds the interior recess 14 and eliminates the influence of heat on the rubber backing 11 as described below. Of course, it is possible.

In the above-mentioned embodiment, when fire extinguishing water or the like is being fed through the connected pipes connected by the pipe joint, the fire extinguishing water or the like flows from the communication port 24 between the fluid reservoir chamber 21 and the fluid passage 20 into the fluid reservoir. Chamber 21 and lumen 23 of rubber backing 11
flows into.

Therefore, even if flame etc. are blown from outside the pipe and the pipe joint becomes extremely hot, the interior recess 14 portion where the rubber backing 11 is located and the rubber backing 11 are cooled with fire extinguishing water, etc. The water supply function can be maintained for a long time without deterioration of quality and sealing properties.

Furthermore, since the group of asbestos backings 12 is arranged closer to the open end 13 of the joint mantle 4 than the rubber backing 11, the rubber backing 11 located at the back
is protected by an asbestos backing 12 and is shielded from high heat such as flame.

As mentioned above, since it has a double seal structure, even if the rubber backing 1 is thermally deformed and the sealing performance is deteriorated, the sealing performance is maintained by the asbestos backing 12, so fire extinguishing water is Water supply will not become impossible.

FIG. 2 is a cross-sectional view similar to FIG. 1 showing a second embodiment. In this embodiment, a ring-shaped interior is provided with a group of asbestos backings 27 slightly inwardly from the open end surface 26 of the joint mantle 25. The annular pressing body 18 in the embodiment shown in FIG. 1 is made unnecessary, and the other structure is the same as that shown in FIG. 1. It is something.

3 and 4 show only the main parts of the third embodiment, in which the rubber backing 11 in the first embodiment is improved, and the rubber backing 29 is attached to the outer periphery of the inner joint pipe 30. An annular groove 33 for an oil reservoir is provided on the inner circumferential surface 32 that is in close contact with the surface 31.
When a joint structure is formed as a pipe joint, the gap between the inner peripheral surface 36 of the joint outer pipe 35 and the outer peripheral surface 31 of the joint inner mantle pipe 30 between the rubber backing 29 and the asbestos backing 34. 37 and the annular groove 33 for the oil reservoir.
lubricating oil 38 and 39 are stored in the pipes to reduce sliding resistance when the fitting positions of the joint outer pipe 35 and the joint inner mantle pipe 30 shift relative to each other due to expansion and contraction of the connected pipes. It is designed to be small and to further improve sealing performance.

5 and 6 show a fourth embodiment, in which the rubber backing 29 in the embodiment shown in FIGS. 3 and 4 is improved to further improve sealing performance. .

As clearly shown in FIG. 6, the rubber backing 40 in this embodiment is provided with a fin-shaped hanging piece 42 at the front end of the outer peripheral surface of a main body portion 41 having a substantially U-shaped cross section, When the rubber backing 40 is placed in the annular interior recess 44 , the hanging piece 42 comes into close contact with one side wall 45 of the interior recess 44 .
This further improves the sealing performance between the inner circumferential surface 46 of No. 3 and the outer circumferential surface 48 of the joint inner mantle tube 47.

The other configurations of this embodiment are completely the same as those of the embodiment shown in FIGS. 3 and 4.

The present invention has the structure and function described above, and when used as a pipe joint for fire pipes etc. installed on the upper deck of a ship, it is exposed to flames and exposed to high heat for a long period of time. However, since the rubber backing is surrounded by a fluid reservoir filled with the fluid flowing inside the fire pipe, and the rubber backing is constantly cooled, thermal denaturation and heat dissipation of the rubber backing occur. This has the effect of preventing deformation and maintaining sufficient sealing performance.

In addition, asbestos packing is installed in a position closer to the open end of the joint mantle than the rubber backing, so this asbestos backing also protects the rubber backing from heat and temporarily seals the rubber backing. Even if the properties of the asbestos backing deteriorate, the asbestos backing maintains its sealing properties to a level that does not cause any practical problems, and has the effect of maintaining its function as a fire extinguishing pipe or the like for a long period of time.

Furthermore, since the sealing performance of the rubber backing does not change over time, there is no need to replace the backing over a long period of time, and the price is low, so it has the effect of lowering maintenance and management costs.

[Brief explanation of drawings]

FIG. 1 is a half-cut longitudinal sectional view of the first embodiment, FIG. 2 is a half-cut longitudinal sectional view of the second embodiment, FIG. 3 is a half-cut longitudinal sectional view of only the main parts of the third embodiment, Figure 4 is a half-cut longitudinal sectional view of the rubber backing used in Figure 3 in its free state;
The figure is a half-cut vertical cross-sectional view of only the essential parts of the fourth embodiment, and FIG. 6 is a half-cut vertical cross-sectional view of the rubber backing used in FIG. 5 in a free state. 1.5: Connected tube end, 4: Joint outer tube, 8: Joint inner tube, 9: Inner peripheral surface, 10: Outer peripheral surface, 11: Rubber backing, 12: Asbestos backing, 13: Open end, 14: Interior recess, 19: Inside, 20: Fluid passage, 21: Fluid reservoir.

Claims (1)

[Scope of utility model registration request] In a pipe fitting in which a fitting inner tube fixed to the other connected tube end is inserted into a fitting outer tube fixed to one connected tube end, the inner circumferential surface of the joint outer tube is An annular rubber backing is installed in a position recessed from the open end of the pipe, which is in close contact with the outer circumferential surface of the inner fitting tube, and a ring-shaped rubber backing is installed in a position close to the open end of the inner circumferential surface, which is in close contact with the outer circumferential surface of the inner fitting tube. An annular asbestos backing is installed inside the joint, and an annular fluid reservoir communicating with a fluid passage inside the pipe joint is provided in the flesh of the joint jacket tube surrounding the interior recess, which is an annular groove of the rubber backing. A pipe joint characterized by: