阅读说明：本技术 一种压缩机自力式旋转密封系统及密封方法 (Self-operated rotary sealing system and sealing method for compressor ) 是由 焦海军 于 2021-09-29 设计创作，主要内容包括：本发明公开了一种压缩机自力式旋转密封系统及密封方法,包括密封壳体,所述密封壳体的内腔设有主螺旋密封副和副螺旋密封副,所述主螺旋密封副和副螺旋密封副沿密封壳体的长度方向首尾对接布置,所述主螺旋密封副和副螺旋密封副的内壁上分别设有主螺旋流道和副螺旋流道；所述主螺旋流道和副螺旋流道内分别设有主螺旋密封和副螺旋密封,所述主螺旋密封和副螺旋密封均为螺旋状,主螺旋密封和副螺旋密封之间不接触；所述主螺旋密封和副螺旋密封均用于套设在主轴上,所述主螺旋密封和副螺旋密封的旋向均朝向密封壳体的两侧。本发明成本降低,密封可靠,增加密封件的使用寿命。(The invention discloses a self-operated rotary sealing system and a self-operated rotary sealing method for a compressor, which comprise a sealing shell, wherein a main spiral sealing pair and an auxiliary spiral sealing pair are arranged in an inner cavity of the sealing shell, the main spiral sealing pair and the auxiliary spiral sealing pair are arranged in a butt joint mode end to end along the length direction of the sealing shell, and a main spiral flow passage and an auxiliary spiral flow passage are respectively arranged on the inner walls of the main spiral sealing pair and the auxiliary spiral sealing pair; the main spiral flow passage and the auxiliary spiral flow passage are respectively internally provided with a main spiral seal and an auxiliary spiral seal which are both spiral, and the main spiral seal and the auxiliary spiral seal are not contacted; the main spiral seal and the auxiliary spiral seal are both used for being sleeved on the main shaft, and the rotating directions of the main spiral seal and the auxiliary spiral seal face to the two sides of the sealing shell. The invention has the advantages of low cost, reliable sealing and prolonged service life of the sealing element.)

1. The self-operated rotary sealing system of the compressor is characterized by comprising a sealing shell, wherein a main spiral sealing pair (3) and an auxiliary spiral sealing pair (1) are arranged in an inner cavity of the sealing shell, the main spiral sealing pair (3) and the auxiliary spiral sealing pair (1) are arranged in a butt joint mode end to end along the length direction of the sealing shell, and a main spiral flow passage and an auxiliary spiral flow passage are respectively arranged on the inner walls of the main spiral sealing pair (3) and the auxiliary spiral sealing pair (1);

a main spiral seal (4) and an auxiliary spiral seal (5) are respectively arranged in the main spiral flow passage and the auxiliary spiral flow passage, the main spiral seal (4) and the auxiliary spiral seal (5) are both in a spiral shape, and the main spiral seal (4) is not in contact with the auxiliary spiral seal (5);

the main spiral seal (4) and the auxiliary spiral seal (5) are both used for being sleeved on the main shaft, and the rotating directions of the main spiral seal (4) and the auxiliary spiral seal (5) are both towards the two sides of the sealing shell.

2. A self-operated rotary seal system of a compressor according to claim 1, wherein the main screw seal (4) and the main screw seal pair (3) are not in contact with each other, and the auxiliary screw seal (5) and the auxiliary screw seal pair (1) are not in contact with each other.

3. The self-operated rotary seal system of claim 1, further comprising a seal retainer ring (2), wherein the seal retainer ring (2) is in interference fit with the main shaft, and the seal retainer ring (2) is located between the main spiral seal (4) and the auxiliary spiral seal (5).

4. A self-operated rotary sealing system of compressor as claimed in claim 3, wherein the diameter of the seal retaining ring (2) is larger than that of the main shaft, and the seal retaining ring (2) is not in contact with the main screw pair (3) and the auxiliary screw pair (1).

5. The self-operated rotary seal system of claim 1 wherein one end of said seal housing is removably attached to a cylinder of a compressor.

6. A self-operated rotary seal system of a compressor as claimed in claim 5 wherein the primary (4) and secondary (5) screw seals are mounted at the axial ends of the compressor.

7. A self-operated rotary seal system of a compressor as claimed in claim 5 wherein the primary (4) and secondary (5) screw seals are mounted at the impeller inlet of the compressor.

8. The self-operated rotary seal system of claim 1, wherein the seal housing comprises an upper seal housing and a lower seal housing, the upper seal housing and the lower seal housing are detachably connected through bolts, and the seal housing is connected to the cylinder block of the compressor in a socket-and-spigot manner.

9. A self-operated rotary seal system of a compressor as claimed in claim 1 wherein the primary (4) and secondary (5) spiral seals are in interference fit with the main shaft.

10. A method for sealing a compressor, which comprises the steps of using a self-operated rotary sealing system of any one of claims 1 to 9, comprising:

the main spiral seal (4) and the auxiliary spiral seal (5) are sleeved on the main shaft, the sealing shell is connected to a cylinder body of the compressor, the main shaft rotates to drive the main spiral seal (4) and the auxiliary spiral seal (5) to rotate, the rotation directions of the main spiral seal (4) and the auxiliary spiral seal (5) are opposite, and the main spiral seal (4) and the auxiliary spiral seal (5) face to two sides of the sealing shell;

leakage media in the compressor enter between the main spiral seal (4) and the main spiral seal pair (3), the rotation of the main spiral seal (4) generates thrust on the leakage media and sends the leakage media back to the inner cavity of the compressor, and meanwhile, the thrust generated by the rotation of the main spiral seal (4) improves the pressure of the leakage media, so that the pressure of the leakage media is greater than the pressure of the leakage media in the inner cavity of the compressor, and the output of the leakage media is prevented;

thrust generated by rotation of the auxiliary spiral seal (5) blocks protective media on the side of the auxiliary spiral seal (5) from entering the inner cavity of the compressor through the main spiral seal (4), and meanwhile, thrust generated by rotation of the auxiliary spiral seal (5) increases conveying force of the protective media.

Technical Field

The invention belongs to the technical field of compressors, and particularly belongs to a self-operated rotary sealing system and a self-operated rotary sealing method for a compressor.

Background

The shaft seal department of centrifugal compressor group or axial compressor leaks and can lead to the inside medium of compressor to leak to the outside along the axle, reduces compressor efficiency, and the high-pressure gas of axle head department leakage simultaneously can produce direct damage to the axle head is sealed, shortens the sealed life of axle head, still can be to forming great potential safety hazard if the material of leaking leaks in operational environment, influences operating personnel safety.

At present centrifugal compressor shaft end adopts dry gas seal or carbon ring seal or labyrinth seal, dry gas seal receives protection medium pressure fluctuation can exert an influence, labyrinth seal is because there is the clearance to lead to the inside medium of equipment to leak to the outside along sealed itself, impeller choma department also adopts labyrinth seal, because labyrinth seal itself has the clearance to lead high-pressure gas to leak to impeller entrance low pressure region along labyrinth seal, lead to the quilt compression that a part of compression medium is repeated, along with the wearing and tearing increase of seal clearance, influence equipment outlet pressure, the flow, reduce compressor unit efficiency and reduce, energy consumption increases.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a self-operated rotary sealing system and a self-operated rotary sealing method for a compressor, which solve the problems of large leakage amount of a shaft end seal of a centrifugal compressor (an axial flow compressor) and short service life of a sealing part.

In order to achieve the purpose, the invention provides the following technical scheme: a self-operated rotary sealing system of a compressor comprises a sealing shell, wherein a main spiral sealing pair and an auxiliary spiral sealing pair are arranged in an inner cavity of the sealing shell, the main spiral sealing pair and the auxiliary spiral sealing pair are arranged in a butt joint mode end to end along the length direction of the sealing shell, and a main spiral flow passage and an auxiliary spiral flow passage are respectively arranged on the inner walls of the main spiral sealing pair and the auxiliary spiral sealing pair;

the main spiral flow passage and the auxiliary spiral flow passage are respectively internally provided with a main spiral seal and an auxiliary spiral seal which are both spiral, and the main spiral seal and the auxiliary spiral seal are not contacted;

the main spiral seal and the auxiliary spiral seal are both used for being sleeved on the main shaft, and the rotating directions of the main spiral seal and the auxiliary spiral seal face to the two sides of the sealing shell.

Further, the main spiral seal is not in contact with the main spiral seal pair, and the auxiliary spiral seal is not in contact with the auxiliary spiral seal pair.

Further, still include sealed fender ring, sealed fender ring interference fit is on the main shaft, sealed fender ring is located between main spiral seal and the vice spiral seal.

Furthermore, the diameter of the sealing baffle ring is larger than that of the main shaft, and the sealing baffle ring is not in contact with the main spiral sealing pair and the auxiliary spiral sealing pair.

Furthermore, one end of the sealing shell is detachably connected to a cylinder body of the compressor.

Further, the main spiral seal and the auxiliary spiral seal are arranged at the shaft end of the compressor.

Further, the primary and secondary screw seals are installed at an impeller inlet of the compressor.

Furthermore, the sealed shell comprises a sealed upper shell and a sealed lower shell, the sealed upper shell and the sealed lower shell are detachably connected through bolts, and the sealed shell is connected to the cylinder body of the compressor in a socket mode.

Further, the main spiral seal and the auxiliary spiral seal are in interference fit with the main shaft.

The invention provides a sealing method of a compressor, which adopts the self-operated rotary sealing system of the compressor and comprises the following steps:

the main spiral seal and the auxiliary spiral seal are sleeved on the main shaft, the seal shell is connected to a cylinder body of the compressor, the main shaft rotates to drive the main spiral seal and the auxiliary spiral seal to rotate, the rotation directions of the main spiral seal and the auxiliary spiral seal are opposite, and the main spiral seal and the auxiliary spiral seal face to two sides of the seal shell;

the leakage medium in the compressor enters between the main spiral seal and the main spiral seal pair, the rotation of the main spiral seal generates thrust to the leakage medium and sends the leakage medium back to the inner cavity of the compressor, and meanwhile, the thrust generated by the rotation of the main spiral seal improves the pressure of the leakage medium, so that the pressure of the leakage medium is greater than the pressure of the leakage medium in the inner cavity of the compressor, and the output of the leakage medium is prevented;

the thrust generated by the rotation of the auxiliary spiral seal blocks the protective medium on the side of the auxiliary spiral seal from entering the inner cavity of the compressor through the main spiral seal, and meanwhile, the thrust generated by the rotation of the auxiliary spiral seal increases the conveying force of the protective medium.

Compared with the prior art, the invention has at least the following beneficial effects:

the invention provides a self-operated rotary sealing system of a compressor, which can reduce the leakage of a compressor unit and improve the operation efficiency of equipment. Self-operated rotary seal systems operate without the need for an additional source of power. The self-operated rotary seal is designed at the sealing part on the main shaft, the high-speed rotating spiral generates a conveying effect, a reverse conveying force is given to a medium, the reverse conveying pressure is greater than the pressure of the medium leaking to the low-pressure side, a certain pressure difference is formed, so that the medium leakage is effectively prevented, the spiral seal on the other side can prevent a protective medium from entering the compressor, the conveying force of the protective medium can be increased by the thrust generated by the high-speed rotating spiral seal, the using amount of the protective medium is reduced, the cost is reduced, the sealing is reliable, and the service life of the sealing element is prolonged.

Further, main spiral seal and main spiral seal do not contact each other between vice, vice spiral seal and vice spiral seal do not contact each other, the vice spiral runner of spiral seal and spiral seal's helical structure can block a certain amount of leakage medium and protective media, through conveying back equipment inside with the medium that leaks, reduce the leakage amount of axle head department medium by a wide margin, will block protective media and get into inside the compressor, improve the pressure of leaking medium and protective media through spiral seal's rotation, form pressure differential with inside, effectively block the outer leakage of inside medium and the entering of protective media.

Furthermore, the sealing baffle ring arranged between the main spiral seal and the auxiliary spiral seal can play a role in blocking and collecting leaked gas and sealing gas, the leaked medium and the sealing gas are blocked at the sealing baffle ring, then the leaked medium and the sealing gas are respectively output along with the rotation of the spiral seal, and the leaked medium returns to the inside of the compressor to form secondary seal, so that the sealing performance is further improved, and the sealing reliability is ensured.

Furthermore, the sealing shell and the cylinder body of the compressor can be detachably connected, the spiral seal is in interference fit with the main shaft, the assembly and disassembly are convenient, the overhaul is convenient, and the production cost is saved.

Furthermore, the sealing device is arranged at the shaft end, one section of the spiral prevents leakage media from leaking to the outside, the other section of the spiral is sealed to prevent protective media from entering the device to pollute the media, the sealing spiral can provide enough pressure for the leakage media to form pressure difference with the leaked inside, the media are completely sealed in operation, and the sealing reliability is ensured.

Furthermore, the invention is arranged at the inlet of the impeller, effectively prevents high-pressure medium at the outlet of the impeller from leaking to the inlet of the impeller through the gap of the inlet of the impeller, prevents the medium from being repeatedly applied with work, improves the working efficiency of the compressor unit, saves energy and improves benefits. The system of the invention is adopted at the outer end of the impeller inlet to replace the original labyrinth seal, effectively forms pressure difference by rotating the medium leaked from the high pressure part of the impeller outlet to the inlet of the impeller and transmits the pressure difference back to the outlet of the impeller, and simultaneously prevents the medium at the inlet from being transmitted to the outlet of the impeller in a rotating way, thereby improving the pressure and the flow at the outlet of the compressor, avoiding the problem that the efficiency of the compressor caused by the leakage of the impeller can not meet the design requirement, saving energy, improving the working benefit of the compressor and saving the production cost.

The invention also provides a sealing method of the compressor, the first stage of sealing at the sealing position adopts the invention, it is made up of two sections of helices, the two helices are rotated in opposite directions, one section of helices prevents the leakage medium from leaking to the outside, another section of sealing prevents the protective media from entering into the apparatus and polluting the medium, the main helix seal provides sufficient pressure for the leakage medium and forms the pressure difference with leaking the inside at the same time, give the reverse conveying force of the leakage medium, further prevent the leakage medium from leaking, and the secondary helix seal provides sufficient pressure for the protective media and forms the pressure difference with the external protective media, give the reverse conveying force of the protective media, reduce the consumption of the protective media, the first stage of sealing at the sealing position adopts the self-operated rotary seal system, seal the medium completely in operation, guarantee the reliability of the seal; the second-stage sealing at the sealing position adopts the sealing form of the existing dry gas sealing and carbon ring sealing, and the primary sealing already blocks most of leakage media, so that the original main sealing function is changed into auxiliary sealing, and the leakage amount of the media is further ensured. The centrifugal compressor (axial flow compressor) adopting the self-operated rotary sealing system has high working efficiency, good sealing reliability, long service life of equipment parts and wide application working condition range.

Drawings

FIG. 1 is a schematic structural view of the present invention;

in the drawings: 1-auxiliary spiral sealing pair, 2-sealing baffle ring, 3-main spiral sealing pair, 4-main spiral sealing and 5-auxiliary spiral sealing;

a is a leakage medium and B is a protective medium.

Detailed Description

The invention is further described with reference to the following figures and detailed description.

As shown in figure 1, the invention provides a self-operated rotary sealing system of a compressor, which solves the problems of large leakage amount of a shaft end seal of a centrifugal compressor (axial flow compressor) and short service life of a sealing part; meanwhile, the invention is used outside the impeller inlet, so that high-pressure medium at the impeller outlet is effectively prevented from leaking to the impeller inlet through the impeller inlet gap, the medium is prevented from being repeatedly applied with work, the working efficiency of the compressor unit is improved, the energy is saved, and the benefit is improved.

In this embodiment, the leakage of the compressor unit is reduced from two parts, the operation efficiency of the equipment is improved, the first part is additionally provided with a self-operated rotary sealing system before the main seal at the shaft end, the self-operated rotary sealing system is arranged on the main shaft in an interference fit manner and rotates along with the main shaft, the self-operated rotary sealing system is formed by organizing two parts into a rotary seal and a static seal, the rotary seal rotates along with the main shaft, the static seal is arranged on the shell of the equipment and does not stand still, and the rotary seal is matched to form a set of complete sealing system. Self-operated rotary seal systems operate without the need for an additional source of power. The self-operated rotary seal is designed at the sealing part on the main shaft, the spiral rotating at high speed generates a conveying effect to provide a reverse conveying force for the medium, the reverse conveying pressure is greater than the pressure of the medium leaking to the low-pressure side, and a certain pressure difference is formed, so that the medium is effectively prevented from leaking. The rotary dynamic seal comprises two sections of spirals, the rotation directions of the two spirals are opposite, the front section of spiral prevents leakage media from leaking to the outside, the rear end of the spiral prevents protective media at the position of the secondary seal from entering the inside of equipment to pollute the media, the front end of the spiral provides enough pressure for the leakage media to form pressure difference with the leaked inside, the first-stage seal at the shaft end adopts a self-operated rotary seal system, the media are completely sealed in operation, and the reliability of sealing is ensured; the second-stage sealing of the shaft end adopts the sealing form of the existing dry gas sealing and carbon ring sealing, and the primary sealing already blocks most of leaked media, so that the original main sealing function is changed into auxiliary sealing, and the leakage amount of the media is further ensured. The centrifugal compressor (axial flow compressor) adopting the self-operated rotary sealing system has high working efficiency, good sealing reliability, long service life of equipment parts and wide application working condition range.

Specifically, the sealing device comprises a sealing shell, wherein a main spiral sealing pair 3 and an auxiliary spiral sealing pair 1 are arranged in an inner cavity of the sealing shell, the main spiral sealing pair 3 and the auxiliary spiral sealing pair 1 are arranged in a butt joint mode end to end along the length direction of the sealing shell, and a main spiral flow passage and an auxiliary spiral flow passage are respectively arranged on the inner walls of the main spiral sealing pair 3 and the auxiliary spiral sealing pair 1; a main spiral seal 4 and an auxiliary spiral seal 5 are respectively arranged in the main spiral flow passage and the auxiliary spiral flow passage, wherein the main spiral seal 4 is not in contact with the main spiral seal pair 3, the auxiliary spiral seal 5 is not in contact with the auxiliary spiral seal pair 1, the main spiral seal 4 and the auxiliary spiral seal 5 are both in a spiral shape, and the main spiral seal 4 is not in contact with the auxiliary spiral seal 5; the main spiral seal 4 and the auxiliary spiral seal 5 are both used for being sleeved on the main shaft, the rotating directions of the main spiral seal 4 and the auxiliary spiral seal 5 are opposite, and in the embodiment, the rotating directions of the main spiral seal 4 and the auxiliary spiral seal 5 are both towards two sides of the sealing shell.

Specifically, still be equipped with between main spiral seal 4 and the vice spiral seal 5 and seal and keep off ring 2, seal and keep off ring 2 interference fit on the main shaft, wherein, the diameter that seals and keep off ring 2 is greater than the diameter of main shaft, seal and keep off ring 2 and main spiral seal pair 3 and vice spiral seal pair 1 contactless, when leaking medium and protection medium reachs sealed fender ring department, seal and keep off ring 2 and block leaking medium and protection medium, play and block the collection effect, along with main spiral seal 4 and the rotation of vice spiral seal 5, leak medium and protection medium are exported by the both sides of seal housing respectively.

Specifically, the sealing shell comprises an upper sealing shell and a lower sealing shell, the upper sealing shell and the lower sealing shell are detachably connected through a bolt, wherein one end of the sealing shell is detachably connected to a cylinder body of the compressor, in the embodiment, a main spiral seal 4 and an auxiliary spiral seal 5 are installed at the shaft end of the compressor, leaked media are conveyed back to the interior of the equipment through thrust generated by rotation of the main spiral seal 4, the leakage amount of the media at the shaft end is greatly reduced, and the conveying pressure of the leaked media can be improved by the thrust generated by rotation of the main spiral seal 4, so that a pressure difference is formed between the leaked media and the interior of the compressor, and the external leakage of the internal media is effectively prevented;

in another embodiment of the invention, the main spiral seal 4 and the auxiliary spiral seal 5 are installed at the inlet of the impeller of the compressor, the outer end of the inlet of the impeller is provided with the system of the invention to replace the original labyrinth seal, the medium leaked from the high pressure part of the outlet of the impeller to the inlet of the impeller is effectively conveyed back to the outlet of the impeller by forming pressure difference through rotation, meanwhile, the medium at the inlet is prevented from being conveyed to the outlet of the impeller in a rotating way, the pressure and the flow at the outlet of the compressor are improved, the problem that the efficiency of the compressor cannot meet the design requirement due to the leakage of the impeller is avoided, the energy is saved, the working efficiency of the compressor is improved, and the production cost is saved.

In the embodiment, the main spiral seal 4 and the auxiliary spiral seal 5 are in interference fit with the main shaft, so that the assembly and disassembly are convenient;

the invention replaces the first-stage seal or the second-stage seal of the compressor, completely seals the medium in operation, ensures the reliability of the seal, adopts the existing seal form of dry gas seal and carbon ring seal for other-stage seal, and changes the original main seal function into auxiliary seal because the seal of the invention blocks most of the leaked medium, thereby further ensuring the leakage amount of the medium. The centrifugal compressor (axial flow compressor) adopting the self-operated rotary sealing system has high working efficiency, good sealing reliability, long service life of equipment parts and wide application working condition range.

The invention also provides a sealing method of the compressor, and the self-operated rotary sealing system of the compressor comprises the following steps:

the main spiral seal 4 and the auxiliary spiral seal 5 are sleeved on the main shaft, the sealing shell is connected to a cylinder body of the compressor, the main shaft rotates to drive the main spiral seal 4 and the auxiliary spiral seal 5 to rotate, the rotation directions of the main spiral seal 4 and the auxiliary spiral seal 5 are opposite, and the main spiral seal 4 and the auxiliary spiral seal 5 face to two sides of the sealing shell;

the leakage medium in the compressor enters between the main spiral seal 4 and the main spiral seal pair 3, the rotation of the main spiral seal 4 generates thrust to the leakage medium, the leakage medium is sent back to the inner cavity of the compressor, the leakage medium quantity of the compressor is reduced, meanwhile, the thrust generated by the rotation of the main spiral seal 4 is larger than the pressure of the leakage medium in the inner cavity of the compressor, the conveying force of the leakage medium is increased, the conveying pressure is larger than the pressure of the leakage medium to the low-pressure side, and a certain pressure difference is formed, so that the leakage of the medium is effectively prevented;

the thrust generated by the rotation of the auxiliary spiral seal 5 blocks the protective medium on the side of the auxiliary spiral seal 5 from entering the inner cavity of the compressor through the main spiral seal 4, and meanwhile, the thrust generated by the rotation of the auxiliary spiral seal 5 increases the conveying force of the protective medium, so that the working efficiency of the compressor unit is improved, and the energy is saved.

Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.