JPS6246954Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to the improvement of pipe joints used for fire extinguishing pipes, combustion exhaust gas pipes, combustion ash transport pipes, steam pipes, etc. installed on the deck of ships. This is a tube that does not deteriorate in sealing performance even when exposed to high heat for a long time or is left unused for a long period of time, can produce a slight relative deviation in the axial direction, and can be supplied at a low cost. The purpose is to provide fittings.

Conventionally, laminated packing made of inelastic materials such as asbestos or lead foil has been used for pipe joints such as fire extinguishing pipes, combustion exhaust gas pipes, combustion ash transport pipes, and steam pipes, but the sealing performance deteriorates over time. As a result, it is necessary to frequently retighten and replace the packing, which not only takes time and effort for maintenance, but also increases the size.
It has the disadvantages of high unit price and high maintenance and management costs, and in addition, it has relatively low sealing performance and the pipe joint cannot cope with the expansion and contraction caused by the thermal expansion of the pipe body, making it prone to breakage.

By adopting the structure described in the claims for utility model registration, the present invention is inexpensive and can maintain perfect sealing performance over a long period of time, and even when exposed to high heat for a long time while using rubber packing. The present invention provides a pipe joint that does not reduce its properties and can prevent unexpected breakage due to slight relative displacement in the axial direction during thermal expansion of the pipe body.

The configuration of the illustrated example will be described below.

FIG. 1 is a half-cut sectional view of the first embodiment, in which a joint jacket tube 4 is connected to a flange 2 of one connected tube end 1 by a flange 3, and is fixed to the other connected tube end. A joint inner mantle pipe 8 connected to and fixed by a flange 7 is slidably inserted into the flange 6 of 5, and between the inner peripheral surface 9 of the joint outer mantle pipe 4 and the outer peripheral surface 10 of the joint inner mantle pipe 8. is sealed with a rubber packing 11 and a rubber heat-resistant packing 36.

The rubber packing 11 described above is an annular packing with a U-shaped cross section that is installed in an internal recess 14 that is an annular groove provided at a position recessed from the open end 13 of the inner circumferential surface 9 of the joint mantle tube 4. As shown in FIG. 2, the leg ends are each expanded outwardly and are elastically deformed into a U-shaped cross section, thereby forming a space between the interior recess 14 and the outer circumferential surface 10 of the joint inner mantle tube 8. It is shaped like a press fit.

As shown in FIGS. 3 and 4, this rubber packing 11 has a comb plate spring 16 with a U-shaped cross section inside a packing body 15 made of a rubber-like elastic body with a substantially U-shaped cross section. The packing body 15 and the spring 16 are continuous in an annular shape, and the cross-sectional shape shown in FIG. 2 is pressed and deformed as shown in FIG. Due to the rebound resilience of 16,
The sealing effect is increased.

This rubber packing 11 has an annular groove 35 for an oil reservoir formed in an inner circumferential surface 34 that is in close contact with an outer circumferential surface 10 of the joint inner mantle tube 8.

The heat-resistant rubber packing 36 described above has an annular packing body 42 made of a rubber-like elastic body with a substantially trapezoidal cross section, and a toroidal spring 43 having a slightly flat coil shape extending over the entire length of the packing body 42. The entire outer peripheral surface of the packing body 42 is covered with a heat-resistant coating such as a cloth 44 made of carbon fiber or glass fiber, thereby improving the heat resistance of the packing body 42 made of a rubber-like elastic body. It is. This fabric 44 may be coated with heat-resistant ceramic powder to further improve its heat resistance, or the entire outer peripheral surface of the packing body 42 may be coated with a heat-resistant ceramic layer mixed with carbon fiber or glass fiber. You can.

Although the inner cavity 45 of the packing body 42 is filled with air, it may be filled with a rubber-like elastic material, or may be filled with oil or a heat-resistant liquid substance.

An annular fluid reservoir 23 communicating with a fluid passage 22 within the pipe joint is formed in the flesh portion 21 of the joint mantle 4 surrounding the interior recess 14 in which the rubber packing 11 is placed.

The illustrated fluid storage chamber 23 has an interior recess 14,
It has a shape that surrounds it from the outer circumferential side and both front and rear sides, and also communicates with the inner cavity 25 of the rubber packing 11 having a U-shaped cross section through a notch 24 provided in the meat part 21. Of course, the shape of the reservoir chamber 23 may be any shape as long as it surrounds the interior recess 14 and can eliminate the influence of heat on the rubber packing 11 as described later.

In the above-described embodiment, when fire extinguishing water, etc. is fed through the connected pipes connected by pipe joints, the fire extinguishing water, etc. flows through the fluid storage chamber 23 and the fluid passage 2.
The fluid flows into the fluid storage chamber 23 and the inner cavity 25 of the rubber packing 11 through the communication port 26 with the rubber packing 11 . Therefore, even if flame etc. are blown from the outside of the pipe and the pipe joint becomes extremely hot, the interior recess 14 portion in which the rubber packing 11 is installed and the rubber packing 11 are cooled with fire extinguishing water, etc. This prevents deterioration and maintains the water supply function for a long time without deteriorating the sealing performance.

Furthermore, since the rubber heat-resistant packing 36 is arranged at a position closer to the open end 13 of the joint outer mantle tube 4 than the rubber packing 11, the rubber heat-resistant packing 11 located at the back is replaced by the rubber heat-resistant packing 36. 36 and is shielded from high heat such as flame.

As described above, since it has a double seal structure, even if the rubber packing 11 is thermally deformed and the sealing performance is deteriorated, the sealing performance is maintained by the rubber heat-resistant packing 36. Water supply for fire extinguishing purposes will not become impossible.

Of course, good sealing performance can be maintained for a long period of time even in pipelines for transporting combustion exhaust gas, combustion ash, steam, etc.

When the above-mentioned joint outer mantle pipe 4 and joint inner mantle pipe 8 have a joint structure as a pipe joint, the inner circumferential surface 9 of the joint mantle pipe 4 between the rubber packing 11 and the rubber heat-resistant packing 36 is The gap portion 39 between the outer circumferential surface 10 of the joint inner sleeve 8 and the annular groove 35 for an oil reservoir in the rubber packing 11 are as follows:
It is a part that stores lubricating oil 40, 41, and is used to prevent sliding when the fitting position of the joint outer pipe 4 and the joint inner mantle pipe 8 shifts relative to each other due to expansion and contraction of the connected pipes. It reduces dynamic resistance, improves sealing performance, absorbs and eliminates expansion and contraction due to thermal expansion of connected pipes, and prevents damage to various parts.

The pipe joint according to the present invention has the configuration described above, and even if it is exposed to high heat from the outside of the joint for a long time when used as a pipe joint, the interior recess in which the rubber packing is installed will remain intact. Since the pipe is surrounded by a fluid reservoir filled with the fluid flowing through the pipe and is constantly cooled, the rubber packing can be prevented from thermal denaturation and deformation, and has the effect of maintaining sufficient sealing performance.

Further, when the rubber packing is pressed and elastically deformed, the internal spring also deforms, and its repulsive elasticity brings the rubber packing into strong elastic contact with the contact surface, producing a strong sealing effect.

In addition, even if the packing body is thermally denatured and loses its elasticity due to being exposed to high heat for a long period of time, the rebound resilience of the spring will not be lost, so the packing body has a good sealing effect due to the rebound resilience of the spring. There are also effects that can last. That is, it is possible to prevent the thermal deformation of the packing body from becoming permanent. At this time, when the inner cavity is filled with air, oil, or a heat-resistant liquid substance, the thermal expansion force of these filled substances causes the packing body to bulge outward in the radial direction. It has the effect of promoting the sealing effect.

In addition, a rubber packing covered with a heat-resistant coating is installed in a position closer to the open end of the joint mantle than the rubber packing, so the rubber packing is also protected by the heat-resistant rubber packing and temporarily Even if the sealing performance of the rubber packing deteriorates, the heat-resistant packing can maintain a level of sealing performance that does not cause any practical problems.

Furthermore, since rubber packing has little change in sealing properties over time, there is no need to replace the packing over a long period of time, and since the price is low, maintenance and management costs can be reduced.

Furthermore, since the entire outer circumferential surface of the rubber heat-resistant packing is covered with a heat-resistant coating, it has all the characteristics of the rubber packing, has excellent heat resistance, improves the sealing effect, and extends the service life. It is valid.

In addition, the annular groove formed in the rubber packing and the gap between the inner circumferential surface of the joint outer tube and the outer circumferential surface of the joint inner tube are used as lubricating oil reservoirs, so lubrication occurs here. When oil accumulates, the relative axial displacement between the inner and outer sleeves of the joint occurs smoothly, absorbing and eliminating the axial expansion and contraction of the pipe body due to the influence of heat, and also has the effect of preventing damage to various parts. be.

[Brief explanation of drawings]

FIG. 1 is a half-cut longitudinal sectional view of the first embodiment, and
The figure is a longitudinal sectional view of the rubber packing used in the thing shown in FIG. 1, FIG. 3 is a front view of the spring, and FIG. 4 is a sectional view taken along the line in FIG. 1, 5: Connected tube end, 4: Joint outer tube, 8: Joint inner tube, 9: Inner peripheral surface, 10: Outer peripheral surface, 11: Rubber packing, 13: Open end, 14: Recess for interior , 15: packing body, 16: spring, 2
1: Flesh part, 22: Fluid passage, 23: Fluid reservoir, 3
5: Annular groove, 36: Rubber heat-resistant packing, 3
9: Gap portion.

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 packing is installed inside the tube at a position deep from the open end of the tube, and is in close contact with the outer circumferential surface of the inner tube of the joint, and a ring-shaped rubber packing is placed inside the inner circumferential surface near the open end of the tube. A closely-fitting annular heat-resistant rubber packing is installed inside, and an annular fluid reservoir communicating with a fluid passage within the pipe joint is formed in the joint outer pipe wall surrounding the interior recess of the rubber packing. In addition, the annular rubber packing and the rubber heat-resistant packing include a packing body made of a rubber-like elastic body,
A spring is installed throughout the entire length of the packing, and the plastic shape of the packing body is held by the rebound elasticity of the spring, and the entire outer peripheral surface of the rubber heat-resistant packing is coated with a heat-resistant coating. At the same time, the rubber packing lubricates the annular groove on the inner circumferential surface that is in close contact with the outer circumferential surface of the inner fitting tube, and the chain portion between the inner circumferential surface of the outer fitting tube and the outer circumferential surface of the inner fitting tube. A pipe joint that is used as an oil reservoir.