Double sealed chamber rotary compensator

Abstract

A double-sealed chamber rotary compensator 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 fasteners, an annular outer boss is provided on the outer surface of the inner tube, 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 therein; 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 therein, 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. The present invention forms a double sealed chamber by adding a composite sealing structure, which can effectively improve the sealing performance of the rotary compensator and extend its service life.

Description

Technical Field

[0001] The invention relates to a rotary compensator for a pipeline, in particular to a double-sealed cavity rotary compensator. 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 rotary compensators, bellows compensators, rotary 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 displacement compensation, but also good sealing performance and a long service life.

[0003] The existing rotary compensator is provided with a seal between the annular inner boss on the inner surface of the outer sleeve and the end of the packing flange extending into the outer sleeve. The seal usually adopts flexible graphite packing. Flexible graphite seal has the characteristics of high temperature resistance, good lubricity, small friction coefficient, no hardening, no volatility, no flow, non-toxicity, no pollution, and aging resistance. However, flexible graphite is easy to oxidize, burn and wear, 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 rotary compensators for pipelines use flexible graphite fillers, which may increase the probability of rotary compensator leakage due to oxidation, burning and wear after long-term use, so as to further improve the sealing performance of the rotary compensator.

[0005] The double-sealed chamber rotary 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 is connected to the outer sleeve by fasteners, an annular outer boss is provided on the outer surface of the inner tube; 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, and 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, and 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 arranged alternately.

[0006] 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.

[0007] The sealing ring is made of elastic material, such as rubber.

[0008] 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 rotary 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.

[0009] 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 rotary compensator, a packing filling device is provided on the outer sleeve to realize online filling of the sealing packing.

[0010] In order to facilitate the relative rotation between the inner tube and the outer tube, a sliding member is provided in the cavity formed between the first annular inner boss and the annular outer boss, and the sliding member is a sliding ring or a ball.

[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, thereby achieving a better sealing effect. The present invention can effectively improve the sealing performance of the rotary compensator and extend its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention.

[0013] Figure 2 for Figure 1 A section enlarged view.

[0014] Figure 3This is a schematic diagram of the structure of Example 2 of the present invention.

[0015] Figure 4 This is a schematic diagram of the structure of Example 3 of the present invention.

[0016] Figure 1-Figure 4 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 sealing packing, 9 is a sliding part, 10 is a connecting pipe, 11 is a first annular inner boss, 12 is an outer boss, 13 is a spring flange, 14 is a spring, 15 is a second annular inner boss, and 16 is a limit block. DETAILED DESCRIPTION

[0017] Example 1

[0018] like Figure 1 As shown, the double sealed chamber rotary compensator described in this embodiment is composed of an inner tube 1, a connecting tube 10, 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, and a limit block 16 is arranged in the connecting tube. 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 by a fastener 2. A first annular inner boss 11 and a second annular inner boss 15 are arranged on the inner surface of the outer sleeve 4, and an annular outer boss 12 is arranged on the outer surface of the inner tube 1. A sliding member 9 is arranged in the cavity between the first annular inner boss 11 and the annular outer boss 12 to facilitate the relative rotation of the inner tube 1 relative to the outer sleeve 4. In this embodiment, the sliding member adopts a sliding ring, and a ball in the prior art can also be adopted.

[0019] A first sealing cavity is formed between the first annular inner boss 11 and the second annular inner boss 15, in which a sealing packing 8 is arranged. A second sealing cavity is formed between the second annular inner boss 15 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.

[0020] In this embodiment, the sealing filler is made of flexible graphite; the sealing ring is made of fluororubber; it can also be made of elastic material, and the sealing ring is made of stainless steel. Of course, other metal materials can also be used.

[0021] like Figure 2As shown, in the above-mentioned composite sealing structure, except for the sealing ring 6 adjacent to the second annular inner boss 15, 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 15 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 15.

[0022] The sealing principle of the composite sealing structure of the present invention is:

[0023] 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.

[0024] When the rotary compensator is working, since the sealing ring of the composite sealing structure has a tapered structure on both sides, when the product is assembled, under the action of the fasteners, a clamping force may be applied to the composite sealing structure through the packing flange, and the diamond-shaped sealing ring directly squeezes the sealing ring to both sides, so that the sealing ring and the inner tube and outer tube can be tightly sealed with less force to achieve a sealing effect.

[0025] Example 2

[0026] like Figure 3 As 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 rotary 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 the position corresponding to the sealing packing on the outer sleeve 4, and the radial through hole built in 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 rotary 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 rotary 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 with a pressure gun facing the injection port. After the supplementation is completed, the screw plug in the transverse hole is first tightened, and then the pressure gun is pulled out, and the screw plug is reinstalled at the outer end of the inlet. In this way, by supplementing the sealing packing online, the volume of the sealing packing in the sealing cavity is increased, thereby timely restoring the sealing performance of the rotary compensator.

[0027] The above-mentioned filler filling device is prior art.

[0028] In this embodiment, the sealing filler is made of flexible graphite; the sealing ring is made of fluororubber, and can also be made of other elastic materials; the sealing ring is made of stainless steel, and of course other metal materials can also be used.

[0029] Example 3

[0030] 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 rotary compensator, this embodiment is provided with a spring flange 13 on the outside of the packing flange 3 on the basis of embodiment 1, and axially arranged springs 14 are evenly distributed along the same circumference between the spring flange 13 and the packing flange 3, and the spring flange 13, the packing flange 3 and the outer sleeve 4 are connected by the same fastener. The spring 14 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 14, 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.

[0031] In this embodiment, the sealing filler is made of flexible graphite; the sealing ring is made of fluororubber, and can also be made of other high-temperature resistant elastic materials; the sealing ring is made of stainless steel, and of course other metal materials can also be used.

Claims

1. A double sealed chamber rotary 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, an annular outer boss is provided on the outer surface of the inner tube, 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 therein; 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 therein, 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.

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

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

4. The double sealed chamber rotary compensator according to claim 1, 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.

5. The double sealed chamber rotary compensator according to claim 1, characterized in that A sealing filler filling device is provided on the outer sleeve.

6. The double sealed chamber rotary compensator according to claim 1, characterized in that A sliding member is provided between the first annular inner boss and the annular outer boss.

7. The double sealed chamber rotary compensator according to claim 6, characterized in that The sliding member is a sliding ring or a ball.

Images