CN212273347U - End face sealing structure of rotary compensator and rotary compensator - Google Patents
End face sealing structure of rotary compensator and rotary compensator Download PDFInfo
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- CN212273347U CN212273347U CN202021151649.0U CN202021151649U CN212273347U CN 212273347 U CN212273347 U CN 212273347U CN 202021151649 U CN202021151649 U CN 202021151649U CN 212273347 U CN212273347 U CN 212273347U
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Abstract
The utility model relates to a rotary compensator's end face seal structure and adopt rotary compensator of this structure. The end face sealing structure comprises an annular inner boss arranged on the inner surface of the outer sleeve and an annular outer boss arranged on the outer surface of the inner sleeve, and a first annular groove is formed by locally recessing one surface of the annular inner boss adjacent to the annular outer boss; one surface of the corresponding annular outer boss ring adjacent to the annular inner boss (8) is partially protruded to form a first step, and the part which is not protruded is a second step; the first step of the annular outer boss supports the sealing ring in the first annular groove of the annular inner boss, and a flexible sealing element is arranged in a space between the second step of the annular outer boss and the annular inner boss. The utility model discloses can effectively delay sealing material ablation volume under high temperature, reduce the loss of rotary compensator sealing material in the fit-up gap under operating condition, and sealed effect has showing and improves.
Description
Technical Field
The utility model relates to a rotary compensator's end face seal structure and rotary compensator.
Background
At present, rotary compensators are increasingly widely used in heat pipelines. The rotary compensator has the advantages of high safety performance, convenience in design, large compensation amount, high economical efficiency of pipeline operation, diversified installation modes and types and the like, and is a product which is preferred by design houses and application units such as thermal power plants and the like. The main technical core of the rotary compensator lies in the sealing technology, and although people are always improving the sealing performance of the rotary compensator, the rotary compensator still has the possibility of leakage in the working process, and the reasons for the leakage are as follows:
1. ablation in an aerobic state at high temperature.
The rotary compensator operates at a high temperature for a long time, and the ablation amount of the sealing material (graphite, etc.) in a high-temperature aerobic state is reduced in volume due to contact with oxygen, thereby causing leakage. Therefore, controlling the amount of contact between the sealing filler and oxygen is one of the most important means for ensuring long-term sealing.
2. The filler is worn during operation.
The inner pipe and the outer sleeve of the rotary compensator cannot be absolutely smooth (namely, the friction coefficient is 0), so that the packing is abraded due to the relative rotation of the inner pipe and the outer sleeve when the rotary compensator works, part of the packing is easily lost from an assembly gap due to the fact that the packing is broken into pieces and powder, the volume of the packing in a sealing cavity is reduced, the sealing pressing force is reduced, and leakage occurs.
3. Wear from oxidation of the seal cavity surfaces.
After the rotary compensator is used for a long time, under the influence of medium adverse factors (such as chloride ions, humidity and temperature) in a pipeline, a contact surface of a sealing cavity and a sealing material is corroded to form unevenness, and the packing is easily abraded under the working state of the rotary compensator, so that part of the sealing packing is in a fragment powder state and is easily lost from an assembly gap, the volume of the packing in the sealing cavity is reduced, the sealing pressing force is reduced, and leakage is caused.
4. The chemical reaction of the seal packing with the media (high temperature steam, high temperature hot water, etc.) is lost.
Because the medium can react with the sealing filler at high temperature (for example, C + H)2O (high temperature) ═ CO + H2) The solid volume of the sealing filler is reduced, the sealing performance is reduced, and leakage is easy to occur.
5. And (5) scouring the sealing packing by the medium under a high-pressure state.
Under the working condition, the medium in the high-temperature and high-pressure state in the rotary compensator easily enters the sealing cavity from the assembly gap to form strong impact force on the sealing filler, and the sealing filler can be lost under the flushing of the high-temperature and high-pressure medium after long-term use, so that the sealing performance is reduced.
Therefore, it is an objective of those skilled in the art to further improve the sealing performance of the rotary compensator.
Disclosure of Invention
In order to effectively delay the ablation volume of sealing material under high temperature, reduced the loss of rotary compensator sealing material in fit-up gap under operating condition, the utility model provides a rotary compensator's end face seal structure and rotary compensator with better sealing performance.
The end face sealing structure of the end face sealing structure rotary compensator for the rotary compensator comprises an annular inner boss arranged on the inner surface of an outer sleeve and an annular outer boss arranged on the outer surface of the inner sleeve, wherein the local inner recess of one surface of the annular inner boss adjacent to the annular outer boss forms a first annular groove; one side of the corresponding annular outer boss adjacent to the annular inner boss is locally protruded to form a first step, and the part which is not protruded is a second step; the first step of the annular outer boss supports the sealing ring in the first annular groove of the annular inner boss, and a flexible sealing element is arranged between the second step of the annular outer boss and the annular inner boss.
The rotary compensator of the utility model adopts the end face sealing structure, which comprises an inner pipe, an outer sleeve, a reducing pipe and a sealing and pressing flange, wherein the outer sleeve is sleeved on the inner pipe, one end of the inner pipe extends into the outer sleeve, the sealing and pressing flange is sleeved on the inner pipe, one end of the sealing and pressing flange extends into the outer sleeve, the inner surface of the outer sleeve is provided with an annular inner boss, the outer surface of the inner pipe is provided with an annular outer boss, and sealing filler is arranged between the annular inner boss and one end of the sealing and pressing flange extending into the outer sleeve; the local inner concave of one surface of the annular inner boss adjacent to the annular outer boss forms a first annular groove; one side of the corresponding annular outer boss adjacent to the annular inner boss is locally protruded to form a first step, and the part which is not protruded is a second step; the first step of the annular outer boss supports the sealing ring in the first annular groove of the annular inner boss, and a flexible sealing element is arranged between the second step of the annular outer boss and the annular inner boss.
In order to further improve the sealing performance, a plurality of concentric second annular grooves are formed in the surface of the second step of the annular outer boss and the surface of the annular inner boss corresponding to the second step of the annular outer boss. Therefore, as the flexible sealing element is usually made of graphite and other materials with better ductility, on one hand, the flexible sealing element can be pressed to form certain extension deformation and fill the toothed annular groove by applying enough pressure in the assembling process, thereby forming better end face sealing, effectively preventing the invasion of external media, reducing the oxidation penetration of steam or hot water in a pipeline to the sealing filler and reducing the leakage probability of the rotary compensator. On the other hand, in the use process, as the inner pipe and the outer pipe move towards each other under the pressure of the medium, further pressure is applied to the flexible sealing element, so that the flexible sealing element further tightly fills the second annular tooth-shaped groove, and a better end face seal is formed.
Furthermore, the cross section of the second annular groove is V-shaped.
In order to solve the potential safety hazard problem caused by the butt joint of the outer sleeve and the reducer pipe in a welding mode, the outer sleeve and the reducer pipe are of an integrally formed integrated structure.
In order to avoid the sealing filler from generating a gap due to normal abrasion in long-term use so as to influence the sealing performance of the whole rotary compensator, the outer sleeve is provided with a sealing filler filling device.
In order to prevent the product from generating reverse dislocation and the displacement of the sealing ring and the flexible sealing element arranged between the inner and outer annular bosses in the process of engineering installation, a limiting block is arranged in the reducer pipe.
The sealing ring is arranged between the inner boss and the outer boss, so that good sealing can be formed, the invasion of external media is effectively prevented, the oxidation penetration of steam or hot water in a pipeline to sealing filler is reduced, and the leakage probability of the rotary compensator is reduced; meanwhile, the flexible sealing material arranged between the inner boss and the outer boss forms another end face seal, the flexible sealing material can be heated and expanded under high temperature when the rotary compensator is in a working state, the annular inner boss and the annular outer boss can move oppositely under the action of medium pressure in the pipeline, so that further pressure is applied to the flexible sealing element, the flexible sealing element is further tightly filled in the toothed second annular groove, and the sealing effect is further improved; moreover, the flexible sealing element made of graphite has good lubricity and is beneficial to relative rotation between the inner pipe and the outer pipe.
The utility model discloses double-ended face seal has been formed on seal structure, twice end face seal promptly, if the sealed inefficacy of one-level, the sealed seal of second grade still can realize sealedly, can effectively prevent to pierce through because of the medium to the oxidation of seal packing and lead to the leakage that fine and close seal became invalid.
Drawings
Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention.
FIG. 2 is a partial enlarged view of portion D of FIG. 1
Fig. 3 is a schematic structural view of embodiment 2 of the present invention.
In fig. 1-3, 1 is an inner tube, 2 is a stud, 3 is a nut, 4 is a gasket, 5 is a sealing hold-down flange, 6 is an outer sleeve, 7 is a sealing filler, 8 is an annular inner boss, 9 is a sealing ring, 10 is a flexible sealing element, 11 is an annular outer boss, a first step (11-1), a first step (11-2), 12 is a limiting block, 13 is a reducer pipe, 14 is a first annular groove, 15 is a second annular groove, and 16 is a filling device.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, detailed descriptions of embodiments of the present invention are provided below with reference to the accompanying drawings, so that the above objects, features and advantages of the present invention will be more clear. The drawings are not intended to be to scale, emphasis instead being placed upon illustrating the principles of the embodiments.
Example 1
As shown in fig. 1-2, the rotary compensator of this embodiment includes an inner tube 1, an outer sleeve 6, a reducer 13, and a sealing and pressing flange 5, where the outer sleeve 6 is sleeved on the inner tube 1, one end of the inner tube 1 extends into the outer sleeve 6, the sealing and pressing flange 5 is sleeved on the inner tube 1, and one end of the sealing and pressing flange extends into the outer sleeve 6, and the two are connected through a stud 2, a nut 3, and a gasket 4. The outer sleeve 6 and the reducer pipe 13 are integrally formed. An annular inner boss 8 is arranged on the inner surface of the outer sleeve 6, an annular outer boss 11 is arranged on the outer surface of the inner pipe 1, and a sealing filler 7 (graphite is used as the sealing filler in the embodiment) is arranged between the annular inner boss 8 and one end, extending into the outer sleeve 6, of the sealing pressing flange 5.
The local inner concave of one side of the annular inner boss 8 adjacent to the annular outer boss forms a first annular groove 14; the corresponding annular outer boss 11 and the adjacent surface of the annular inner boss 8 partially protrude to form a first step 11-1, and the part which does not protrude is a second step 11-2. The surface of the second step (11-2) of the annular outer boss (11) and the surface of the annular inner boss (8) corresponding to the second step (11-2) of the annular outer boss (11) are provided with a plurality of concentric second annular grooves (15) with V-shaped cross sections. The sealing ring 9 is pressed in the first annular groove 14 of the annular inner boss 8 by the first step 11-1 of the annular outer boss 11, and the flexible sealing element 10 is arranged between the second step 11-2 of the annular outer boss 11 and the annular inner boss 8.
In order to prevent the product from dislocating in the opposite direction and the displacement and the falling of the sealing ring and the flexible sealing piece arranged between the inner and the outer annular bosses in the engineering installation process, a limiting block 12 is arranged in the reducer pipe 13.
Example 2
As shown in fig. 3, the basic structure of the present embodiment is the same as that of embodiment 1, except that:
in order to keep good sealing performance, 4-30 injection ports are uniformly distributed on the outer sleeve 6 along the same circumference at the position corresponding to the sealing filler 7, a radial through hole arranged in each injection port is communicated with a transverse hole at the waist part, a screw plug with a hole is arranged at the outer end of each radial through hole, and the screw plug arranged in each transverse hole traverses the radial through hole to form a sealing filler filling device 16 of a valve structure. When the rotary compensator is used, if the sealing performance is reduced and leakage occurs, the screw plug arranged at the outer end of the injection opening can be removed on line, then the screw plug in the transverse hole is rotated, the hole on the screw plug is communicated with the radial through hole, and the injection opening is supplemented with sealing filler by using a pressure gun. After the supplement is finished, firstly screwing the screw plug in the transverse hole, then pulling out the pressure gun, and then reinstalling the screw plug at the outer end of the inlet. Therefore, the sealing performance of the rotary compensator can be timely recovered by replenishing the sealing filler on line.
Claims (9)
1. The end face sealing structure of the rotary compensator comprises an annular inner boss (8) arranged on the inner surface of an outer sleeve (6) and an annular outer boss (11) arranged on the outer surface of an inner pipe (1), and is characterized in that the part of one surface, adjacent to the annular outer boss, of the annular inner boss (8) is recessed to form a first annular groove (14); one surface of the corresponding annular outer boss (11) adjacent to the annular inner boss (8) is locally protruded to form a first step (11-1), and the part which is not protruded is a second step (11-2); a sealing ring (9) is propped in a first annular groove (14) of an annular inner boss (8) by a first step (11-1) of an annular outer boss (11), and a flexible sealing element (10) is arranged between a second step (11-2) of the annular outer boss (11) and the annular inner boss (8).
2. An end face seal structure of a rotary compensator according to claim 1, characterized in that a plurality of concentric second annular grooves (15) are formed on the surface of the second step (11-2) of the annular outer boss (11) and the surface of the annular inner boss (8) corresponding to the second step (11-2) of the annular outer boss (11).
3. End face seal structure of a rotary compensator according to claim 2, characterized in that the second annular groove (15) is V-shaped in cross-section.
4. A rotary compensator comprises an inner tube (1), an outer sleeve (6), a reducer pipe (13) and a sealing and pressing flange (5), wherein the outer sleeve (6) is sleeved on the inner tube (1), one end of the inner tube (1) extends into the outer sleeve (6), the sealing and pressing flange (5) is sleeved on the inner tube (1), one end of the sealing and pressing flange extends into the outer sleeve (6), an annular inner boss (8) is arranged on the inner surface of the outer sleeve (6), an annular outer boss (11) is arranged on the outer surface of the inner tube (1), and a sealing filler (7) is arranged between the annular inner boss (8) and one end of the sealing and pressing flange (5) extending into the outer sleeve (6), and is characterized in that one surface of the annular inner boss (8) adjacent to the annular outer boss is locally recessed to form a first annular groove (14); one surface of the corresponding annular outer boss (11) adjacent to the annular inner boss (8) is locally protruded to form a first step (11-1), and the part which is not protruded is a second step (11-2); a sealing ring (9) is propped in a first annular groove (14) of an annular inner boss (8) by a first step (11-1) of an annular outer boss (11), and a flexible sealing element (10) is arranged between a second step (11-2) of the annular outer boss (11) and the annular inner boss (8).
5. A rotary compensator according to claim 4, wherein the surface of the second step (11-2) of the outer annular projection (11) and the surface of the inner annular projection (8) corresponding to the second step (11-2) of the outer annular projection (11) are provided with a plurality of concentric second annular grooves (15).
6. A rotary compensator according to claim 4, wherein the annular groove is V-shaped in cross-section.
7. Rotational compensator according to claim 4, characterized in that the outer sleeve (6) and the reducer pipe (13) are of one-piece integral construction.
8. Rotary compensator according to claim 4, characterized in that the outer sleeve (6) is provided with a sealing packing filling device (16).
9. Rotary compensator according to claim 4, characterized in that a stop block (12) is arranged in the reducer pipe (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021151649.0U CN212273347U (en) | 2020-06-19 | 2020-06-19 | End face sealing structure of rotary compensator and rotary compensator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021151649.0U CN212273347U (en) | 2020-06-19 | 2020-06-19 | End face sealing structure of rotary compensator and rotary compensator |
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| CN212273347U true CN212273347U (en) | 2021-01-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021151649.0U Active CN212273347U (en) | 2020-06-19 | 2020-06-19 | End face sealing structure of rotary compensator and rotary compensator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111594681A (en) * | 2020-06-19 | 2020-08-28 | 江苏贝特管件有限公司 | End face sealing structure of rotary compensator and rotary compensator |
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2020
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111594681A (en) * | 2020-06-19 | 2020-08-28 | 江苏贝特管件有限公司 | End face sealing structure of rotary compensator and rotary compensator |
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