CN212509954U - End face sealing structure for rotary compensator and rotary compensator - Google Patents

Abstract

The utility model relates to a rotary compensator is with terminal surface seal structure and adopt rotary compensator of this structure. The end face sealing structure for the rotary compensator comprises an annular inner boss (9) arranged on the inner surface of an outer sleeve (6) and a sealing filler (8) arranged between a sealing pressing flange (5) and the annular inner boss (9), wherein a sealing pressing ring (7) is arranged between the sealing pressing flange (5) and the sealing filler (8), the cross section of the sealing pressing ring (7) is in a concave shape, and one end, adjacent to the sealing filler (8), of the sealing pressing flange (5) extends into a concave-shaped groove opening of the sealing pressing ring (7). The utility model discloses can effectively delay sealing material ablation volume under high temperature, reduce rotary compensator sealing material under operating condition and run off from the fit-up gap, sealed effect has showing and improves.

Description

End face sealing structure for rotary compensator and rotary compensator

Technical Field

The utility model relates to a rotary compensator is with terminal surface 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 is with end face seal structure and rotary compensator of better sealing performance.

End face seal structure for rotary compensator is provided with sealed clamping ring including setting up the annular inner boss on the outer sleeve pipe internal surface, setting up the gland packing between sealed flange and the annular inner boss, between sealed flange and the gland packing, sealed clamping ring cross-section is character cut in bas-relief, and sealed flange stretches into in the character cut in bas-relief groove of sealed clamping ring with the adjacent one end of gland packing.

The rotary compensator of the utility model adopts the end face sealing structure, which comprises an inner tube, an outer sleeve, a reducing tube and a sealing and pressing flange, wherein one end of the inner tube extends into the outer sleeve, the sealing and pressing flange is sleeved on the inner tube, and one end of the sealing and pressing flange extends into the outer sleeve; an annular inner boss is arranged on the inner surface of the outer sleeve, an annular outer boss is arranged on the outer surface of the inner pipe, sealing filler is arranged between the annular inner boss and one end, extending into the outer sleeve, of the sealing pressing flange, and a sliding piece or an end face sealing piece is arranged in a cavity formed between the annular outer boss and the annular inner boss; be provided with sealed clamping ring between sealed hold-down flange and the sealing filler, sealed clamping ring cross-section is the character cut in bas-relief, and sealed hold-down flange stretches into the character cut in bas-relief notch of sealed clamping ring with the adjacent one end of sealing filler.

Furthermore, the outer sleeve and the reducer pipe are of an integrated structure formed integrally, so that the problem of potential safety hazards caused by butt joint of the outer sleeve and the reducer pipe in a welding mode at present is solved.

Furthermore, a limiting block is arranged in the reducing pipe to prevent the product from dislocating in the opposite direction in the engineering installation process and prevent a sliding piece or an end face sealing piece arranged between the inner annular boss and the outer annular boss from shifting.

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.

The sliding member is a ball or a sliding ring.

Because the utility model discloses sealed clamping ring that has set up between sealed flange and the seal packing fills and reduces the fitting gap between sealed flange and outer tube and the inner tube, reaches the purpose of isolated or reduction seal packing and oxygen contact to effectual ablation volume of delaying seal packing graphite under high temperature also can effectively reduce the loss of rotary compensator sealing material from fitting gap under operating condition simultaneously.

Drawings

Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention.

Fig. 2 is an enlarged view of a portion (a) of fig. 1.

Fig. 3 is a schematic structural diagram 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 press ring, 8 is sealing filler, 9 is an annular inner boss, 10 is a sliding piece, 11 is an annular outer boss, 12 is a limiting block, 13 is a reducer, and 14 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 and other 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 and 2, the rotation compensator of the present embodiment includes an inner tube 1, an outer sleeve 6, a reducer 13, and a sealing and pressing flange 5, wherein 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, and the inner tube 1 and the outer sleeve are connected through a screw 2, a nut 3, and a gasket 4. An annular inner boss 9 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, a sealing filler 8 is arranged between the annular inner boss 9 and one end, extending into the outer sleeve 6, of the sealing pressing flange 5, a sliding piece 10 is arranged in a cavity formed between the annular outer boss 11 and the annular inner boss 9, a sealing pressing ring 7 is arranged between the sealing pressing flange 5 and the sealing filler 8, the cross section of the sealing pressing ring 7 is in a concave shape, and one end, adjacent to the sealing filler 6, of the sealing pressing flange 5 extends into a concave groove of the sealing pressing ring 7.

In order to prevent the product from dislocating in the opposite direction in the engineering installation process and prevent the sliding part 10 arranged between the inner and outer annular bosses from displacing, a limiting block 12 is arranged in the reducer pipe 13.

In the present embodiment, the sliding member 10 is a ball.

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 5, 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 14 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.

In the present embodiment, an end face seal is disposed in the cavity formed between the annular outer boss and the annular inner boss instead of the sliding member 10, and the end face seal is made of a flexible material such as graphite, which can further ensure the sealing performance of the rotary compensator.

Claims (6)

1. The end face sealing structure for the rotary compensator comprises an annular inner boss (9) arranged on the inner surface of an outer sleeve (6) and a sealing filler (8) arranged between a sealing pressing flange (5) and the annular inner boss (9), and is characterized in that a sealing pressing ring (7) is arranged between the sealing pressing flange (5) and the sealing filler (8), the cross section of the sealing pressing ring (7) is in a concave shape, and one end, adjacent to the sealing filler (8), of the sealing pressing flange (5) extends into a concave groove opening of the sealing pressing ring (7).

2. The utility model provides a rotary compensator, including inner tube (1), outer tube (6), reducing pipe (13), sealed flange (5) compress tightly, the one end of inner tube (1) stretches into in outer tube (6), sealed flange (5) suit is on inner tube (1), its one end stretches into in outer tube (6), be equipped with annular inner boss (9) on the internal surface of outer tube (6), be equipped with annular outer boss (11) on the surface of inner tube (1), be equipped with between the one end that outer tube (6) were stretched into in annular inner boss (9) and sealed flange (5) and seal packing (8), be provided with slider (10) or end face seal spare in the cavity that forms between annular outer boss (11) and the annular inner boss, its characterized in that: sealing pressing flange (5) and sealing filler (8) are provided with sealing clamping ring (7), sealing clamping ring (7) cross-section is the character cut in bas-relief, and sealing pressing flange (5) stretches into in the character cut in bas-relief notch of sealing clamping ring (7) with the adjacent one end of sealing filler (8).

3. A rotary compensator according to claim 2, characterized in that the outer sleeve (6) and the reducer (13) are of one-piece integral construction.

4. A rotary compensator according to claim 2, characterized in that the outer sleeve (6) is provided with a sealing packing filling device (14).

5. A rotary compensator according to claim 2, characterized in that a stop block (12) is arranged in the reducer pipe (13).

6. Rotational compensator according to claim 2, characterized in that the slide (10) is a ball or a sliding ring.

Images