CN110848168A - Dry air sealing device for compressor - Google Patents
Dry air sealing device for compressor Download PDFInfo
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- CN110848168A CN110848168A CN201911016869.4A CN201911016869A CN110848168A CN 110848168 A CN110848168 A CN 110848168A CN 201911016869 A CN201911016869 A CN 201911016869A CN 110848168 A CN110848168 A CN 110848168A
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- differential pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/083—Sealings especially adapted for elastic fluid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/10—Shaft sealings
- F04D29/102—Shaft sealings especially adapted for elastic fluid pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a dry gas sealing device for a compressor, which comprises a dry gas sealing structure, a shaft end sealing structure, a medium gas leakage channel, a first differential pressure gauge and a second differential pressure gauge, wherein the shaft end sealing structure comprises a shaft sleeve, a first comb seal, a mixing cavity and a second comb seal, a first differential pressure gauge is arranged between the sealed gas inlet pipe and the mixing cavity, the sealed gas and the medium gas are kept relatively stable in the mixing cavity by monitoring the reading number of the first differential pressure gauge in real time, a second differential pressure gauge is arranged between the sealing gas inlet pipe and the medium gas leakage channel and is used for monitoring whether the sealing gas enters the cylinder body of the compressor or not and the leakage condition of the medium gas, the flow of the sealing gas is adjusted by monitoring the indicating number of the second differential pressure gauge in real time, the sealing gas is prevented from entering the cylinder body of the compressor, and the leaked medium gas and the sealing gas are discharged after being converged in the mixing cavity.
Description
Technical Field
The invention belongs to the field of compressor sealing, and particularly relates to a dry gas sealing device for a compressor.
Background
A dry gas sealing device, namely a dry operation gas sealing device, is a novel shaft end seal which uses a slotting sealing technology for gas sealing, and belongs to non-contact type sealing. Micron-sized shallow grooves which are periodically distributed are processed on a static ring or a dynamic ring of the dry gas sealing device, and an end face gas film with a certain thickness is formed between the end faces of the dynamic ring and the static ring by utilizing a dynamic pressure effect, so that the non-contact stable operation of the dry gas sealing is realized. The dry gas sealing device has the outstanding advantages of low power consumption, low leakage, less abrasion, long service life and the like, and is widely applied to rotary mechanical equipment of large-scale units.
Under the condition that a large centrifugal compressor runs at a high speed, the friction force of the common sealing technology is large, heat is easy to generate, the device is damaged, and the device cannot work for a long time. In order to ensure the safety of the centrifugal compressor, a common dry gas sealing device is used as shaft end sealing to avoid leakage of working medium gas in a unit, which causes potential safety hazards, environmental pollution and efficiency reduction. Under high-pressure operation, the stability of the dry gas sealing device is the key of the dry gas sealing technology of the high-pressure centrifugal compressor, and is particularly important for the safety and performance stability of the centrifugal compressor.
At present, a typical dry gas sealing device prevents the medium gas in the cylinder of the compressor from leaking by controlling the sealing gas pressure to be higher than the medium gas pressure in the cylinder of the centrifugal compressor. However, although such dry gas sealing devices meet the requirement of shaft end sealing, the dry gas sealing devices cannot avoid that sealing gas enters the compressor cylinder body to pollute the medium gas, which cannot meet the process requirement of ensuring zero pollution of the working medium gas. Therefore, there is a need to develop a new dry gas sealing device that prevents the sealing gas from entering the compressor.
Disclosure of Invention
The invention aims to provide a dry gas sealing device for a compressor, which can prevent sealing gas from entering a compressor cylinder body to pollute medium gas.
In order to solve the problems, the technical scheme of the invention is as follows:
a dry gas sealing device for a compressor comprises a dry gas sealing structure, a shaft end sealing structure, a medium gas leakage channel, a first differential pressure gauge and a second differential pressure gauge, wherein the dry gas sealing structure, the shaft end sealing structure and the medium gas leakage channel are sequentially arranged on a rotating shaft along the axial direction, and the medium gas leakage channel is close to one side of a cylinder body;
the air inlet of the medium gas leakage channel is connected with the cylinder body;
the shaft end sealing structure comprises a shaft sleeve, a first comb seal, a mixing cavity and a second comb seal, the shaft sleeve is sleeved on the rotating shaft, the first comb tooth seal, the mixing cavity and the second comb tooth seal are sequentially sleeved outside the shaft sleeve along the axial direction, the second comb seal is close to one side of the cylinder body, the air inlet of the first comb seal is connected with the air outlet of the sealed air inlet pipe, the gas inlet of the second comb tooth seal is connected with the gas outlet of the medium gas leakage channel, the mixing cavity comprises a seal gas inlet, a medium gas inlet and a mixed gas outlet, the seal gas inlet is connected with the gas outlet of the first comb seal, the medium gas inlet is connected with the gas outlet of the second comb seal, and the mixed gas outlet is used for discharging the mixed gas in the mixing cavity;
one end of the first differential pressure gauge is connected with the sealed gas inlet pipe, and the other end of the first differential pressure gauge is connected with the mixed gas outlet and used for monitoring the pressure difference between the sealed gas inlet pipe and the mixing cavity;
one end of the second differential pressure gauge is connected with the sealed gas inlet pipe, and the other end of the second differential pressure gauge is connected with the medium gas leakage channel and used for monitoring the pressure difference between the sealed gas inlet pipe and the medium gas leakage channel.
Preferably, the gas mixing device further comprises a mixed gas exhaust pipeline, wherein a gas inlet of the mixed gas exhaust pipeline is connected with the mixed gas outlet and used for exhausting the mixed gas in the mixing cavity.
Preferably, a first flow regulating valve is arranged at one end of the gas outlet of the mixed gas exhaust pipeline and used for controlling the exhaust flow of the mixed gas, and a second flow regulating valve is arranged at one end of the gas inlet of the sealed gas inlet pipe and used for controlling the input flow of the sealed gas.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects:
1) the invention provides a dry gas sealing device for a compressor, which comprises a dry gas sealing structure, a shaft end sealing structure, a medium gas leakage channel, a first differential pressure gauge and a second differential pressure gauge, wherein the shaft end sealing structure comprises a shaft sleeve, a first comb seal, a mixing cavity and a second comb seal, the first differential pressure gauge is arranged between a sealed gas inlet pipe and the mixing cavity, the sealed gas and the medium gas are kept relatively stable in the mixing cavity by monitoring the number of the first differential pressure gauge in real time, the second differential pressure gauge is arranged between the sealed gas inlet pipe and the medium gas leakage channel and used for monitoring whether the sealed gas enters the cylinder body of the compressor and the leakage condition of the medium gas, the flow of the sealed gas is adjusted by monitoring the number of the second differential pressure gauge in real time, the sealed gas is prevented from entering the cylinder body of the compressor, and the medium gas leaked in a process allowable range and the sealed gas are discharged after being converged in the mixing cavity, the zero pollution of the medium gas in the cavity of the compressor is ensured, and the leakage amount of the medium gas in the process requirement permission is also ensured.
2) According to the dry gas sealing device for the compressor, the first flow regulating valve is arranged at one end of the gas outlet of the mixed gas exhaust pipeline, the second flow regulating valve is arranged at one end of the gas inlet of the sealed gas inlet pipe, the first flow regulating valve is used for controlling the discharge flow of the mixed gas, the second flow regulating valve is used for controlling the introduction flow of the sealed gas, and the flow of the sealed gas and the flow of the mixed gas are controlled more conveniently and accurately.
Drawings
Fig. 1 is a schematic view of a dry gas sealing apparatus for a compressor.
Description of reference numerals:
1: a dry gas sealing structure; 2: a shaft end sealing structure; 21: a shaft sleeve; 22: the first comb teeth are sealed; 23: a mixing chamber; 24: the second comb teeth are sealed; 3: a medium gas leakage passage; 4: a first differential pressure gauge; 5: a second differential pressure gauge; 6: a mixed gas exhaust duct; 61: a first flow regulating valve; 7: a sealed gas inlet pipe; 71: a second flow regulating valve; 8: a rotating shaft.
Detailed Description
The present invention provides a dry gas sealing device for a compressor, which is described in detail below with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims.
Referring to fig. 1, fig. 1 is a schematic diagram of a dry gas sealing device for a compressor, the invention provides a dry gas sealing device for a compressor, which comprises a dry gas sealing structure 1, a shaft end sealing structure 2, a medium gas leakage channel 3, a first differential pressure gauge 4 and a second differential pressure gauge 5, wherein the dry gas sealing structure 1, the shaft end sealing structure 2 and the medium gas leakage channel 3 are sequentially arranged on a rotating shaft 8 along an axial direction, and the medium gas leakage channel 2 is close to one side of a cylinder body;
shaft end seal structure 2 includes axle sleeve 21, first broach is sealed 22, hybrid chamber 23 and second broach is sealed 24, and axle sleeve 21 suit is on pivot 8, and the axle sleeve 21 outside is equipped with first broach seal 22, hybrid chamber 23 and second broach seal 24 along the axial in proper order, and second broach seal 24 is close to cylinder body one side, and the air inlet of first broach seal 22 links to each other with the gas outlet of sealed gas intake pipe 7. The air inlet of the second comb seal 24 is connected with the air outlet of the medium gas leakage channel 3, the mixing chamber 23 comprises a sealing gas inlet, a medium gas inlet and a mixed gas outlet, the sealing gas inlet is connected with the air outlet of the first comb seal 22, the medium gas inlet is connected with the air outlet of the second comb seal 24, and the mixed gas outlet is used for discharging the mixed gas in the mixing chamber 23. In the invention, the sealing gas enters the dry gas sealing device from the sealing gas inlet pipe 7, a part of the sealing gas enters the dry gas sealing structure 1, used for keeping the stable operation of the dry gas sealing structure 1, the residual part of sealing gas enters the mixing cavity 23 through the first comb tooth seal 22, the gas inlet of the medium gas leakage channel 3 is connected with the cylinder body, the medium gas leaked from the cylinder body of the compressor enters the mixing cavity 23 through the second comb tooth seal 24, and the seal gas and the medium gas are merged in the mixing chamber 23, and the merged mixed gas is discharged out of the dry gas sealing device through a mixed gas outlet. And a first flow regulating valve 61 is provided at an outlet end of the mixed gas exhaust duct 6 for controlling an exhaust flow of the mixed gas, and a second flow regulating valve 71 is provided at an inlet end of the sealing gas inlet pipe 7 for controlling an input flow of the sealing gas, the first flow regulating valve 61 and the second flow regulating valve 71 being provided for more conveniently and accurately controlling the flow of the sealing gas and the mixed gas.
One end of the first differential pressure gauge 4 is connected with the sealing gas inlet pipe 7, and the other end of the first differential pressure gauge 4 is connected with the mixed gas outlet, and is used for monitoring the pressure difference between the sealing gas inlet pipe 7 and the mixing cavity 23.
One end of the second differential pressure gauge 5 is connected with the sealing gas inlet pipe 7, and the other end of the second differential pressure gauge 5 is connected with the medium gas leakage channel 3, and is used for monitoring the pressure difference between the sealing gas inlet pipe 7 and the medium gas leakage channel 3.
The working principle of the invention is that the pressure of the medium gas in the cylinder of the compressor is 6MPa for further explanation, the pressure difference between the rear of the second flow regulating valve 71 on the sealed gas inlet pipe 7 and the medium gas leakage channel 3 of the cylinder of the compressor is monitored by the second differential pressure gauge 5, the pressure difference between the sealed gas inlet pipe 7 and the mixing cavity 23 is monitored by the first differential pressure gauge 4, the reasonable flow of the sealed gas and the medium gas is judged by the number indicated by the second differential pressure gauge 5 and the first differential pressure gauge 4, and the reasonable flow is regulated by the first flow regulating valve 61 and the second regulating valve 71 together. Preferably, the number of the first differential pressure gauge 4 is controlled to be 0.1MPa, namely, the sealing gas and the medium gas are kept relatively stable in the mixing cavity 23, and an ideal working state is achieved; if the number of the second differential pressure gauge 5 is more than 0.1MPa, indicating that the sealing gas enters the cylinder of the compressor to pollute the medium gas, under the working condition, the first flow regulating valve 61 and the second regulating valve 71 are coordinately controlled, the pressures on two sides are regulated by controlling the flow, and the numbers of the first differential pressure gauge 4 and the second differential pressure gauge 5 are observed constantly, so that the first differential pressure gauge 4 is always less than or equal to 0.1MPa, namely, the sealing gas is ensured to enter the device through the sealing gas inlet pipe 7, part of the sealing gas is removed to enter the dry gas sealing structure 1 to keep the stable operation of the dry gas sealing structure 1, the rest sealing gas enters the mixing cavity 23, and the number of the first differential pressure gauge 4 is kept at 0.1MPa by controlling the first flow regulating valve 61 and the second regulating valve 71; the number of the second differential pressure meter 5 is always less than or equal to 0.1MPa, and when the number of the second differential pressure meter 5 is equal to 0.1MPa, the medium gas has zero leakage; when the number of the second differential pressure gauge 5 is less than 0.1MPa, medium gas leaks out from the cylinder of the compressor through the medium gas leakage channel 3, the medium gas is allowed to leak in a trace amount within a process allowable range, and the leaked medium gas and the sealing gas are mixed in the mixing cavity 23 and then are discharged along the mixed gas exhaust pipeline 6. The indication number of the first differential pressure gauge 4 is controlled to be kept within the threshold range, so that the sealing gas and the medium gas are kept relatively stable in the mixing cavity 23, and the sealing gas is prevented from entering the cylinder body of the compressor; the aim of the invention is achieved by controlling the indication number of the second differential pressure meter 5 to be kept in the threshold value range, and ensuring zero leakage of the medium gas or only the leakage amount within the process requirement permission.
The invention provides a dry gas sealing device for a compressor, which comprises a dry gas sealing structure 1, a shaft end sealing structure 2, a medium gas leakage channel 3, a first differential pressure gauge 4 and a second differential pressure gauge 5, wherein the shaft end sealing structure 2 comprises a shaft sleeve 21, a first comb tooth seal 22, a mixing cavity 23 and a second comb tooth seal 24, the first differential pressure gauge 4 is arranged between a sealing gas inlet pipe 7 and the mixing cavity 23, the indication of the first differential pressure gauge 4 is monitored in real time, the sealing gas and the medium gas are kept relatively stable in the mixing cavity 23, the second differential pressure gauge 5 is arranged between the sealing gas inlet pipe 7 and the medium gas leakage channel 3, the second differential pressure gauge 5 is used for monitoring whether the sealing gas enters the cylinder body of the compressor and the leakage condition of the medium gas, the flow of the sealing gas is adjusted by monitoring the indication of the second differential pressure gauge 5 in real time, and the sealing gas is prevented from entering the cylinder body of the compressor, simultaneously, the medium gas leaked within the process allowable range and the sealing gas are converged in the mixing cavity and then discharged, so that zero pollution of the medium gas in the compressor cavity is guaranteed, and the leakage amount of the medium gas within the process requirement allowable range can be guaranteed.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, it is still within the scope of the present invention if they fall within the scope of the claims of the present invention and their equivalents.
Claims (3)
1. A dry gas sealing device for a compressor comprises a dry gas sealing structure and is characterized by further comprising a shaft end sealing structure, a medium gas leakage channel, a first differential pressure gauge and a second differential pressure gauge, wherein the dry gas sealing structure, the shaft end sealing structure and the medium gas leakage channel are sequentially arranged on a rotating shaft along the axial direction, and the medium gas leakage channel is close to one side of a cylinder body;
the air inlet of the medium gas leakage channel is connected with the cylinder body;
the shaft end sealing structure comprises a shaft sleeve, a first comb seal, a mixing cavity and a second comb seal, the shaft sleeve is sleeved on the rotating shaft, the first comb tooth seal, the mixing cavity and the second comb tooth seal are sequentially sleeved outside the shaft sleeve along the axial direction, the second comb seal is close to one side of the cylinder body, the air inlet of the first comb seal is connected with the air outlet of the sealed air inlet pipe, the gas inlet of the second comb tooth seal is connected with the gas outlet of the medium gas leakage channel, the mixing cavity comprises a seal gas inlet, a medium gas inlet and a mixed gas outlet, the seal gas inlet is connected with the gas outlet of the first comb seal, the medium gas inlet is connected with the gas outlet of the second comb seal, and the mixed gas outlet is used for discharging the mixed gas in the mixing cavity;
one end of the first differential pressure gauge is connected with the sealed gas inlet pipe, and the other end of the first differential pressure gauge is connected with the mixed gas outlet and used for monitoring the pressure difference between the sealed gas inlet pipe and the mixing cavity;
one end of the second differential pressure gauge is connected with the sealed gas inlet pipe, and the other end of the second differential pressure gauge is connected with the medium gas leakage channel and used for monitoring the pressure difference between the sealed gas inlet pipe and the medium gas leakage channel.
2. The dry gas sealing device for a compressor according to claim 1, further comprising a mixed gas exhaust duct, wherein a gas inlet of the mixed gas exhaust duct is connected to the mixed gas outlet for exhausting the mixed gas in the mixing chamber.
3. The dry gas sealing apparatus for a compressor according to claim 2, wherein a first flow rate regulating valve is provided at an end of the gas outlet of the mixed gas exhaust duct for controlling a discharge flow rate of the mixed gas, and a second flow rate regulating valve is provided at an end of the gas inlet of the sealing gas inlet pipe for controlling an input flow rate of the sealing gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911016869.4A CN110848168A (en) | 2019-10-24 | 2019-10-24 | Dry air sealing device for compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911016869.4A CN110848168A (en) | 2019-10-24 | 2019-10-24 | Dry air sealing device for compressor |
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| CN110848168A true CN110848168A (en) | 2020-02-28 |
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| CN201911016869.4A Pending CN110848168A (en) | 2019-10-24 | 2019-10-24 | Dry air sealing device for compressor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113565801A (en) * | 2021-08-11 | 2021-10-29 | 上海电气（集团）总公司 | Low-temperature compressor sealing and heat-preserving device and control method thereof |
-
2019
- 2019-10-24 CN CN201911016869.4A patent/CN110848168A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113565801A (en) * | 2021-08-11 | 2021-10-29 | 上海电气（集团）总公司 | Low-temperature compressor sealing and heat-preserving device and control method thereof |
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