Double sealing chamber sealing structure and sleeve compensator using the sealing structure

Abstract

The present application relates to a double sealing chamber sealing structure and a sleeve compensator using the same. The double sealing chamber sealing structure includes a first annular inner boss and a second annular inner boss arranged on the inner surface of the outer sleeve, a first sealing chamber is formed between the first annular inner boss and the second annular inner boss, and a sealing filler is arranged therein; a second sealing chamber is formed between the second annular inner boss and an end of the filler flange extending into the outer sleeve, and a composite sealing structure is arranged therein, the composite sealing structure includes N sealing rings and N-1 sealing rings, N is a natural number greater than or equal to 2, and the aforementioned sealing rings and sealing rings are arranged alternately. By adopting a double sealing chamber structure, the present application can effectively solve the problems of the existing sleeve compensator having only one sealing chamber and the seal only using flexible graphite fillers, which are easy to oxidize, burn out and wear, and long-term use will increase the probability of compensator leakage, and can further improve the sealing performance of the sleeve compensator and extend its service life.

Description

Technical Field

[0001] The invention relates to a sealing structure, in particular to a double sealing cavity sealing structure for a pipeline compensator and a sleeve compensator adopting the sealing structure. Background Art

[0002] Compensation devices are generally required to be installed in pipelines in industries such as electricity, petroleum, chemical industry, and thermal power. Existing compensation devices usually include sleeve compensators, bellows compensators, sleeve compensators, spherical compensators, etc., which are used to compensate for the axial or radial displacement of the pipeline caused by thermal expansion and contraction. Since the medium transported by the pipeline generally has a certain temperature and pressure, there are higher requirements for the sealing performance of the compensator, especially when transporting high-temperature and high-pressure media, the requirements for the compensator are higher: not only must there be sufficient thermal expansion and contraction compensation, but also good sealing performance and a long service life.

[0003] Existing pipe compensators such as sleeve compensators usually only have a seal between the annular inner boss on the inner surface of the outer sleeve and one end of the packing flange extending into the outer sleeve. The seal is generally made of flexible graphite. Flexible graphite seals have the characteristics of high temperature resistance and good lubricity, small friction coefficient, non-hardening, non-volatility, non-flow, non-toxicity, non-pollution, and aging resistance. However, flexible graphite is easily oxidized, burned and worn, and long-term use will increase the probability of compensator leakage. Summary of the invention

[0004] The technical problem to be solved by the present invention is that the sealing components of existing sleeve compensators for pipelines use flexible graphite fillers, which may increase the probability of compensator leakage due to oxidation, burning and wear after long-term use, so as to further improve the sealing performance of the sleeve compensator.

[0005] The double sealing chamber sealing structure for the sleeve compensator described in the present invention includes a first annular inner boss and a second annular inner boss arranged on the inner surface of the outer sleeve, and a first sealing chamber is formed between the first annular inner boss and the second annular inner boss, in which a sealing filler is arranged; a second sealing chamber is formed between the second annular inner boss and an end of the filler flange extending into the outer sleeve, in which a composite sealing structure is arranged, and the composite sealing structure includes N sealing rings and N minus one sealing ring, N is a natural number greater than or equal to 2, and the aforementioned sealing rings and sealing rings are arranged alternately.

[0006] The double-sealed chamber sleeve compensator described in the present invention comprises an inner tube, a connecting tube, an outer sleeve sleeved on the inner tube and a packing flange, one end of the packing flange extends into the outer sleeve, the packing flange and the outer sleeve are connected by fasteners, a first annular inner boss and a second annular inner boss are provided on the inner surface of the outer sleeve, a first sealed chamber is formed between the first annular inner boss and the second annular inner boss, a sealing packing is provided in the chamber; a second sealed chamber is formed between the second annular inner boss and one end of the packing flange extending into the outer sleeve, a composite sealing structure is provided in the chamber, the composite sealing structure comprises N sealing rings and N minus one sealing ring, N is a natural number greater than or equal to 2, and the aforementioned sealing rings and sealing rings are alternately arranged.

[0007] In the composite sealing structure, except for the sealing ring adjacent to the second annular inner boss, the two side surfaces of the other sealing rings are concave to form a cavity with a V-shaped cross-section, and the cross-sectional shape of one end of the packing flange extending into the outer sleeve is a triangle that matches the aforementioned V-shaped cavity; a diamond-shaped cavity is formed between two adjacent sealing rings, and the cross-sectional shape of the corresponding sealing ring is a diamond, and both ends extend into the V-shaped cavity of the adjacent sealing ring respectively; one end of the sealing ring adjacent to the second annular inner boss is concave to form a V-shaped cavity, and the other end is concave to form a cavity shape that matches the cross-sectional shape of the adjacent end of the second annular inner boss.

[0008] The sealing ring is made of elastic material, such as rubber.

[0009] In order to prevent the sealing ring in the composite sealing structure from producing gaps due to normal wear after long-term use, thereby affecting the sealing performance of the sleeve compensator, a spring flange is also provided on the outside of the packing flange, and axially arranged springs are evenly distributed along the same circumference between the spring flange and the packing flange. The spring flange, the packing flange and the outer sleeve are connected by the same fastener. When the sealing ring produces gaps due to normal wear after long-term use, the packing flange can be further extended into the outer sleeve under the action of the spring, thereby eliminating the gaps caused by normal wear of the sealing ring in the composite sealing structure after long-term use.

[0010] In order to prevent the sealing packing from generating gaps due to normal wear during long-term use, thereby affecting the sealing performance of the entire sleeve compensator, a packing filling device is provided on the outer sleeve to realize online filling of the sealing packing.

[0011] The present invention forms a double sealing cavity by adding a composite sealing structure on the basis of the prior art. The two sides of the sealing ring of the composite sealing structure are both concave to form a cavity with a tapered cross section. The cavity and the tapers on both sides of the diamond-shaped sealing ring cooperate with each other. After assembly, only a relatively small force is required to make the sealing ring fit and seal with the outer wall of the inner tube and the inner wall of the outer sleeve under the top pressure of the diamond-shaped sealing ring. This can effectively solve the problem that the existing sleeve compensator has only one sealing cavity and the sealing member only uses flexible graphite filler, which is easy to oxidize, burn and wear during use, and long-term use will increase the probability of leakage of the compensator. In addition, through the double sealing cavity, the sealing performance of the sleeve compensator can be further improved and its service life can be extended.

[0012] The double-sealed cavity composite self-sealing structure of the present invention can be applied not only to sleeve compensators but also to rotary compensators. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention.

[0014] Figure 2 for Figure 1 A section enlarged view.

[0015] Figure 3 This is a schematic diagram of the structure of Example 2 of the present invention.

[0016] Figure 4 This is a schematic diagram of the structure of Example 3 of the present invention.

[0017] Figure 1-Figure 4 Among them, 1 is an inner tube, 2 is a fastener, 3 is a packing flange, 4 is an outer sleeve, 5 is a sealing ring, 6 is a sealing ring, 7 is a packing filling device, 8 is a graphite packing, 9 is a connecting pipe, 10 is a first annular inner boss, 11 is an annular outer boss, 12 is a spring flange, 13 is a spring, and 14 is a second annular inner boss. DETAILED DESCRIPTION

[0018] Example 1

[0019] like Figure 1 As shown, the double-sealed chamber sealing sleeve compensator described in this embodiment is composed of an inner tube 1, a connecting tube 9, an outer sleeve 4 sleeved on the inner tube and a packing flange 3. The outer sleeve 4 and the connecting tube 10 are an integrated structure. One end of the packing flange 3 extends into the outer sleeve 4, and the packing flange 3 is connected to the outer sleeve 4 through a fastener 2. A first annular inner boss 10 and a second annular inner boss 14 are provided on the inner surface of the outer sleeve 4, and an annular outer boss 11 is provided on the outer surface of the inner tube 1. The annular outer boss 11 and the first annular outer boss 10 are spaced a certain distance apart, so as to facilitate the axial movement of the inner tube 1 relative to the outer sleeve 4 to adapt to the expansion and contraction of the pipeline due to thermal expansion and contraction.

[0020] A first sealing cavity is formed between the first annular inner boss 10 and the second annular inner boss 14, in which a sealing packing 8 is arranged. A second sealing cavity is formed between the second annular inner boss 14 and one end of the packing flange 3 extending into the outer sleeve 4, in which a composite sealing structure is arranged. The composite sealing structure includes N sealing rings 6 and N-1 sealing rings 5, where N is a natural number greater than or equal to 2. The aforementioned sealing rings 6 and sealing rings 5 ​​are arranged alternately, that is, there is a sealing ring between every two adjacent sealing rings. This embodiment has three sealing rings and two sealing rings.

[0021] In this embodiment, the sealing filler 8 is made of graphite; the sealing ring is made of silicone rubber, and may also be made of other elastic materials; the sealing ring is made of stainless steel, and of course may also be made of other metal materials.

[0022] like Figure 2 As shown, in the above-mentioned composite sealing structure, except for the sealing ring 6 adjacent to the second annular inner boss 14, the two side surfaces of the remaining sealing rings 6 are concave to form a cavity with a V-shaped cross-section, and the cross-sectional shape of one end of the packing flange 3 extending into the outer sleeve 4 is a triangle adapted to the aforementioned V-shaped cavity; a diamond-shaped cavity is formed between two adjacent sealing rings 6, and the cross-sectional shape of the corresponding sealing ring 5 is a diamond, and both ends respectively extend into the V-shaped cavity of the adjacent sealing ring 6; one end of the sealing ring 6 adjacent to the second annular inner boss 14 is concave to form a V-shaped cavity, and the cavity shape formed by the concave at the other end is adapted to the cross-sectional shape of the adjacent end of the second annular inner boss 14.

[0023] The sealing principle of the composite sealing structure of the present invention is:

[0024] Since the sealing ring is made of elastic material and its two side surfaces are concave to form a cavity with a tapered cross-section, the cavity and the tapers on both sides of the diamond-shaped sealing ring cooperate with each other. After assembly, only relatively small force is required to make the sealing ring fit and seal with the outer wall of the inner tube and the inner wall of the outer sleeve under the top pressure of the diamond-shaped sealing ring.

[0025] When the sleeve compensator is working, due to the effect of friction, when the inner tube tends to be compressed inward, the sealing ring and the diamond sealing ring on the right will fit more closely; when the inner tube tends to be pulled outward, the sealing ring and the diamond sealing ring on the left will fit more closely, thereby realizing the self-sealing function.

[0026] Example 2

[0027] like Figure 3As shown, in order to avoid the sealing packing in the first sealing cavity from generating gaps due to normal wear during long-term use, thereby affecting the sealing performance of the entire sleeve compensator, this embodiment is provided with a packing filling device 7 on the outer sleeve 4 on the basis of embodiment 1. Specifically, 2-30 injection ports are evenly distributed along the same circumference at positions corresponding to the sealing packing on the outer sleeve 4, and the radial through hole built into each injection port is connected to the transverse hole of the waist. A screw plug is provided at the outer end of the radial through hole, and the screw plug installed in the transverse hole crosses the radial through hole to form a sealing packing filling device 7 of the valve structure. During the use of the sleeve compensator, when the sealing packing in the first sealing cavity generates gaps due to normal wear during long-term use, thereby causing the sealing performance of the sleeve compensator to decrease, the screw plug installed at the outer end of the injection port and the screw plug in the transverse hole can be removed online, and the sealing packing can be supplemented at the injection port with a pressure gun. After the supplement is completed, first tighten the screw plug in the transverse hole, then pull out the pressure gun, and then reinstall the screw plug at the outer end of the inlet. In this way, by replenishing the sealing filler online, the volume of the sealing filler in the sealing chamber is increased, thereby promptly restoring the sealing performance of the sleeve compensator.

[0028] The above-mentioned filler filling device is prior art.

[0029] In this embodiment, the sealing filler is made of flexible graphite; the sealing ring is made of silicone rubber, and may also be made of other elastic materials; the sealing ring is made of stainless steel, and of course may also be made of other metal materials.

[0030] Example 3

[0031] like Figure 4 As shown, in order to prevent the sealing ring in the composite sealing structure from generating gaps due to normal wear after long-term use, thereby affecting the sealing performance of the sleeve compensator, this embodiment is provided with a spring flange 12 on the outside of the packing flange 3 on the basis of embodiment 1, and axially arranged springs 13 are evenly distributed along the same circumference between the spring flange 12 and the packing flange 3, and the spring flange 12, the packing flange 3 and the outer sleeve 4 are connected by the same fastener. The spring 13 is in a compressed state under normal working conditions. When the sealing ring 6 generates gaps due to normal wear after long-term use, the packing flange 3 can be further extended into the outer sleeve 4 under the elastic force of the spring 13, thereby eliminating the gaps generated by the normal wear of the sealing ring 6 in the composite sealing structure after long-term use, so that the diamond-shaped sealing ring keeps squeezing the sealing ring, so that the sealing ring continues to fit tightly with the inner tube and the outer sleeve.

[0032] In this embodiment, the sealing filler is made of flexible graphite; the sealing ring is made of silicone rubber, and may also be made of other elastic materials; the sealing ring is made of stainless steel, and of course may also be made of other metal materials.

Claims

1. A double sealing chamber sealing structure, characterized in that It includes a first annular inner boss and a second annular inner boss arranged on the inner surface of the outer sleeve, a first sealing cavity is formed between the first annular inner boss and the second annular inner boss, and a sealing packing is arranged in the cavity; a second sealing cavity is formed between the second annular inner boss and an end of the packing flange extending into the outer sleeve, and a composite sealing structure is arranged in the cavity, and the composite sealing structure includes N sealing rings and N-1 sealing rings, where N is a natural number greater than or equal to 2, and the aforementioned sealing rings and sealing rings are arranged alternately; Except for the sealing ring adjacent to the second annular inner boss, the two side surfaces of the other sealing rings are concave to form a cavity with a V-shaped cross-section, and the cross-sectional shape of one end of the packing flange extending into the outer sleeve is a triangle that matches the aforementioned V-shaped cavity; a diamond-shaped cavity is formed between two adjacent sealing rings, and the cross-sectional shape of the corresponding sealing ring is a diamond, and the two ends respectively extend into the V-shaped cavity of the adjacent sealing ring; one end of the sealing ring adjacent to the second annular inner boss is concave to form a V-shaped cavity, and the other end is concave to form a cavity shape that matches the cross-sectional shape of the adjacent end of the second annular inner boss.

2. The double sealing chamber sealing structure according to claim 1, characterized in that The sealing ring is made of elastic material.

3. The double sealing chamber sealing structure according to claim 2, characterized in that The sealing ring is made of rubber.

4. A double sealing chamber sleeve compensator, characterized in that It comprises an inner tube, a connecting tube, an outer sleeve sleeved on the inner tube and a packing flange, one end of the packing flange extends into the outer sleeve, the packing flange is connected to the outer sleeve by a fastener, a first annular inner boss and a second annular inner boss are provided on the inner surface of the outer sleeve, a first sealing cavity is formed between the first annular inner boss and the second annular inner boss, and a sealing packing is provided in the first sealing cavity; a second sealing cavity is formed between the second annular inner boss and one end of the packing flange extending into the outer sleeve, and a composite sealing structure is provided in the second sealing cavity, the composite sealing structure comprises N sealing rings and N-1 sealing rings, N is a natural number greater than or equal to 2, and the aforementioned sealing rings and sealing rings are arranged alternately; Except for the sealing ring adjacent to the second annular inner boss, the two side surfaces of the other sealing rings are concave to form a cavity with a V-shaped cross-section, and the cross-sectional shape of one end of the packing flange extending into the outer sleeve is a triangle that matches the aforementioned V-shaped cavity; a diamond-shaped cavity is formed between two adjacent sealing rings, and the cross-sectional shape of the corresponding sealing ring is a diamond, and the two ends respectively extend into the V-shaped cavity of the adjacent sealing ring; one end of the sealing ring adjacent to the second annular inner boss is concave to form a V-shaped cavity, and the other end is concave to form a cavity shape that matches the cross-sectional shape of the adjacent end of the second annular inner boss.

5. The double-seal-chamber sleeve compensator according to claim 4, characterized in that The sealing ring is made of elastic material.

6. The double sealing chamber sleeve compensator according to claim 5, characterized in that The sealing ring is made of rubber.

7. The double-seal-chamber sleeve compensator according to claim 4, characterized in that A spring flange is also arranged on the outer side of the packing flange. Axially arranged springs are evenly distributed along the same circumference between the spring flange and the packing flange. The spring flange, the packing flange and the outer sleeve are connected by the same fastener.

8. The double sealing chamber sleeve compensator according to claim 4, characterized in that A sealing filler filling device is provided on the outer sleeve.

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