CN106640202B - Shaft seal device of high-temperature steam screw machine and pressure control method thereof - Google Patents
Shaft seal device of high-temperature steam screw machine and pressure control method thereof Download PDFInfo
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- CN106640202B CN106640202B CN201611210619.0A CN201611210619A CN106640202B CN 106640202 B CN106640202 B CN 106640202B CN 201611210619 A CN201611210619 A CN 201611210619A CN 106640202 B CN106640202 B CN 106640202B
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- seal
- cooling water
- pressure
- water inlet
- inlet pipe
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- 238000000034 method Methods 0.000 title claims abstract description 7
- 239000000498 cooling water Substances 0.000 claims abstract description 55
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 40
- 230000001105 regulatory effect Effects 0.000 claims abstract description 34
- 238000007789 sealing Methods 0.000 claims abstract description 28
- 230000001276 controlling effect Effects 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 239000003566 sealing material Substances 0.000 description 2
- 241000167854 Bourreria succulenta Species 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C19/00—Sealing arrangements in rotary-piston machines or engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C19/00—Sealing arrangements in rotary-piston machines or engines
- F01C19/005—Structure and composition of sealing elements such as sealing strips, sealing rings and the like; Coating of these elements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C20/00—Control of, monitoring of, or safety arrangements for, machines or engines
- F01C20/24—Control of, monitoring of, or safety arrangements for, machines or engines characterised by using valves for controlling pressure or flow rate, e.g. discharge valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
- F01C21/06—Heating; Cooling; Heat insulation
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Sealing Devices (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The invention discloses a shaft seal device of a high-temperature steam screw machine, which comprises a front seal, a main seal, a sealing medium inlet pipe, a cooling water inlet pipe and a water return pipe. The primary seal is connected to the sealing medium inlet pipe. And a cooling water inlet is arranged on the screw shell between the front seal and the main seal. The front seal is provided with a temperature transmitter, and the side wall of the front seal is provided with a plurality of through holes; a water return hole is formed in the position, corresponding to one of the through holes, of the screw machine shell. The cooling water inlet pipe is communicated with the cooling water inlet, a first flow regulating valve is arranged on the cooling water inlet pipe, and the output end of the temperature transmitter is connected with the input end of the first flow regulating valve. The water return pipe is communicated with the water return hole, the water return pipe is provided with a pressure transmitter and a second flow regulating valve, and the output end of the pressure transmitter is connected with the input end of the second flow regulating valve. The invention also discloses a pressure control method of the shaft seal device. The invention can reduce the temperature of the medium steam contacting with the main seal.
Description
Technical Field
The invention relates to a shaft seal device of a high-temperature steam screw machine.
Background
The shaft seal device is used for effectively isolating a bearing lubricating oil system from a working cavity, and is an important part of an oil-free screw machine. Screw machines in the field of energy conservation often use high-temperature and high-pressure steam as a working medium. At present, a shaft seal device of a common screw machine is generally formed by combining a front seal and a main seal, wherein the front seal generally adopts a labyrinth seal, and the main seal adopts a mechanical seal or a dry gas seal. A balance hole is arranged between the front seal and the main seal at the air inlet end and the air outlet end, and the pressure of the main seal medium air at the high-pressure side is reduced after the front seal and the main seal are connected by using a pipeline, so that the pressure of oil supply or air supply of the main seal is reduced. For steam screw machines, high temperature problems, especially primary seal failure due to superheated steam, are common with controlled medium steam pressure.
At present, the customization of the high-temperature resistant material as the main sealing element is a feasible scheme aiming at the high-temperature factor. However, due to the limitation of the life of the sealing material and the high cost, the sealing material cannot be applied on a large scale in many occasions, especially in the steam energy-saving and environment-friendly field.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a shaft seal device for a high-temperature steam screw machine, which can reduce the temperature of working medium steam contacting with a main seal under the condition of ensuring that the working medium steam in the high-temperature steam screw machine is not leaked.
The invention aims to provide a pressure control method of a shaft seal device for a high-temperature steam screw machine.
In order to solve the technical problems, the invention adopts the technical scheme that:
the invention provides a shaft seal device of a high-temperature steam screw machine, which comprises a front seal, a main seal and a sealing medium inlet pipe, wherein the front seal and the main seal are arranged on a rotor of the screw machine; the main seal is connected with a sealing medium inlet pipe, and the sealing medium inlet pipe is used for injecting sealing medium into the main seal; wherein, a cooling water inlet is arranged on the screw shell between the front seal and the main seal; the temperature transmitter is arranged on the front seal, a plurality of through holes are formed in the side wall of the front seal, and each through hole is communicated with a gap between the inner wall of the front seal and the outer peripheral wall of the rotor; a water return hole is formed in the position, corresponding to one through hole, of the screw rod shell; the shaft seal device also comprises a cooling water inlet pipe and a water return pipe; one end of the cooling water inlet pipe is communicated with the cooling water inlet, the cooling water inlet pipe is provided with a first flow regulating valve, and the control output end of the temperature transmitter is connected with the control input end of the first flow regulating valve and used for regulating the opening of the first flow regulating valve; one end of the water return pipe is communicated with the water return hole, the water return pipe is provided with a pressure transmitter and a second flow regulating valve, and the control output end of the pressure transmitter is connected with the control input end of the second flow regulating valve and used for regulating the opening degree of the second flow regulating valve.
The invention also provides a pressure control method of the shaft seal device of the high-temperature steam screw machine, which comprises the following steps:
setting the pressure set value of a pressure transmitter to be 0.2-0.3 MPa higher than the pressure P1 of a steam working cavity of the high-temperature steam screw machine, and controlling the opening of a second flow regulating valve through the pressure transmitter so as to enable the return water pressure P3 in a return water pipe to reach the set value;
setting a temperature set value of the temperature transmitter, and controlling the opening of the first flow regulating valve through the temperature transmitter; the temperature set value is such that the cooling water inlet pressure P2 in the cooling water inlet pipe is 0.1-0.2 MPa higher than the return water pressure P3;
the pressure P4 of the sealing medium injected into the main seal is set to be 0.1-0.2 MPa higher than the cooling water inlet pressure P2.
After the technical scheme is adopted, the invention at least has the following advantages:
1. according to the invention, the cooling water inlet is formed in the screw casing between the front seal and the main seal, and cooling water is introduced, so that the temperature of working medium steam contacting with the main seal can be reduced, and the service life of the main shaft seal is prolonged. Meanwhile, the opening degrees of a first flow regulating valve on the cooling water inlet pipe and a second flow regulating valve on the water return pipe are respectively regulated through a pressure transmitter and a temperature transmitter, so that the pressure of a sealing medium injected into the main seal is greater than the cooling water inlet pressure, greater than the water return pressure in the recovery pipe and greater than the pressure of a steam working cavity of the high-temperature steam screw machine, and the working medium steam and the cooling water in the high-temperature steam screw machine can be prevented from leaking to the external environment;
2. the invention improves the feasibility of common mechanical seal/dry gas seal in the field of high-temperature steam, and improves the reliability and the economy of the shaft seal device by processing high-temperature medium steam through the preposed seal.
Drawings
FIG. 1 is a schematic structural view of one embodiment of a shaft sealing apparatus of a high temperature steam screw machine according to the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Please refer to fig. 1. The shaft sealing device of the high temperature steam screw machine according to an embodiment of the present invention includes a front seal 2 and a main seal 3 mounted on a rotor 1 of the screw machine, a sealing medium inlet pipe 4, a cooling water inlet pipe 5, and a water return pipe 6.
The front seal 2 shown in fig. 1 is a comb seal, but in another embodiment, the front seal 2 may also be a carbon ring seal. The primary seal 3 may be a mechanical seal or a dry gas seal. The main seal 3 is connected to a sealing medium inlet pipe 4, and the sealing medium inlet pipe 4 is used for injecting sealing medium, which may be sealing oil or sealing gas, into the main seal 3.
A cooling water inlet is arranged on the screw shell (not shown in the figure) between the front seal and the main seal 3 of the screw rod 2. One end of the cooling water inlet pipe 5 is communicated with the cooling water inlet, and the other end of the cooling water inlet pipe 5 is communicated with a water pump (not shown in the figure). The cooling water flowing from the cooling water inlet can lower the temperature of the working medium steam contacting with the main seal 3, thereby avoiding the failure of the main seal caused by the superheated steam. The cooling water inlet pipe 5 is provided with a first flow regulating valve 81 and a pressure gauge 83 for detecting the water pressure of the cooling water inlet pipe. The temperature transmitter 91 is installed on the front seal 2, the temperature transmitter 91 can monitor the temperature of the front seal, and the control output end of the temperature transmitter 91 is connected with the control input end of the first flow regulating valve 81 and used for regulating the opening degree of the first flow regulating valve 81.
The side wall of the front seal 2 is provided with a plurality of through holes 21, and each through hole is communicated with a gap g between the inner wall of the front seal 2 and the outer peripheral wall of the rotor 1. The number of the through holes 21 is preferably 4 to 8, and preferably, the plurality of through holes 21 are equally spaced in the circumferential direction of the front seal side wall. A water return hole is formed in the position, corresponding to one through hole, of the screw rod shell, and one end of the water return pipe 6 is communicated with the water return hole. The one of the through holes may be any one of the plurality of through holes 21. The cooling return water flowing out of the plurality of through holes 21 is converged to a return water hole through the outer wall of the front seal 2 or the inner wall of the screw housing, and flows into the return water pipe 6 through the return water hole. The return pipe 6 is provided with a pressure transmitter 92 and a second flow rate regulating valve 82, and the pressure transmitter 92 can monitor the return pressure in the return pipe 6. A control output of the pressure transmitter 92 is connected to a control input of the second flow control valve 82 for adjusting the opening of the second flow control valve 82.
In order to ensure that the working medium steam and the cooling water in the high-temperature steam screw machine cannot leak to the external environment, the invention also provides a pressure control method of the shaft seal device of the high-temperature steam screw machine, which comprises the following control steps:
setting the pressure set value of the pressure transmitter 92 to be 0.2-0.3 MPa higher than the pressure P1 of the steam working cavity of the high-temperature steam screw machine, and controlling the opening degree of the second flow regulating valve 82 through the pressure transmitter 92 so as to enable the return water pressure P3 in the return water pipe 6 to reach the set value; for the high-temperature steam screw machine, the pressure P1 of the steam working chamber is a parameter determined in design, and can be considered as a known constant;
the temperature setting value of the temperature transmitter 91 is set. In the embodiment, the temperature set value is 80-100 ℃, and the temperature range is also the temperature range of the front seal in normal operation; the opening degree of the first flow regulating valve 81 is controlled through the temperature transmitter 91, the flow of the cooling water is increased or decreased, so that the main seal 3 at the rear end is ensured to operate in a safe temperature range, and the temperature set value is such that the cooling water inlet pressure P2 in the cooling water inlet pipe 5 is 0.1-0.2 MPa higher than the return water pressure P3; in the embodiment, whether the set temperature value can meet the requirement can be known by observing the pressure value indicated by the pressure gauge 83, and if the set temperature value cannot meet the requirement, the set temperature value can be corrected until the reset set temperature value can enable the cooling water inlet pressure P2 in the cooling water inlet pipe 5 to be 0.1-0.2 MPa higher than the return water pressure P3 all the time;
the pressure P4 of the sealing medium injected into the main seal 3 is set to be 0.1-0.2 MPa higher than the cooling water inlet pressure P2.
By the above control, P4> P2> P3> P1 can be realized. The cooling water can be prevented from leaking to the main sealing side and polluting the main sealing and the bearing device due to P4 and P2; p2 is more than P3, P2 is more than P1, can guarantee one route of cooling water is discharged through the return pipe 6, another route enters the working chamber of the screw machine through the chink channel C between leading and sealing 2 and the trochanter 1, similar to the function of spray liquid and unite with working medium steam as an organic whole; p3> P1 prevents back-channeling of the working medium steam into the return pipe 6.
Preferably, a first flowmeter 85 and a second flowmeter 86 are respectively arranged on the cooling water inlet pipe 5 and the cooling water return pipe 6, the first flowmeter 85 is used for recording the inlet flow of the cooling water, and the second flowmeter 86 is used for recording the return flow of the cooling water. By calculating the difference between the measured values of the first flow meter 85 and the second flow meter 86, the amount of cooling water entering the inside of the steam working chamber of the high temperature steam screw machine can be known, and since this portion of cooling water also serves as the auxiliary cooling liquid jet, this portion of cooling water can be used as the reduced amount of liquid jet.
The screw machine according to an embodiment of the present invention may be a screw compressor or a screw expander, and the shaft sealing device of the high-temperature steam screw machine of the present application is applicable to both the compressor and the expander.
Claims (9)
1. The shaft seal device of the high-temperature steam screw machine comprises a front seal, a main seal and a sealing medium inlet pipe, wherein the front seal and the main seal are arranged on a rotor of the screw machine; the main seal is connected with the sealing medium inlet pipe, and the sealing medium inlet pipe is used for injecting sealing medium into the main seal; the screw rod casing between the front seal and the main seal is provided with a cooling water inlet; the temperature transmitter is arranged on the front seal, a plurality of through holes are formed in the side wall of the front seal, and each through hole is communicated with a gap between the inner wall of the front seal and the outer peripheral wall of the rotor; a water return hole is formed in the position, corresponding to one through hole, of the screw rod shell;
the shaft seal device also comprises a cooling water inlet pipe and a water return pipe; one end of the cooling water inlet pipe is communicated with the cooling water inlet, a first flow regulating valve is arranged on the cooling water inlet pipe, and the control output end of the temperature transmitter is connected with the control input end of the first flow regulating valve and used for regulating the opening degree of the first flow regulating valve; one end of the water return pipe is communicated with the water return hole, the water return pipe is provided with a pressure transmitter and a second flow regulating valve, and the control output end of the pressure transmitter is connected with the control input end of the second flow regulating valve and used for regulating the opening degree of the second flow regulating valve.
2. The shaft seal assembly of claim 1 wherein said forward seal is a comb seal or a carbon ring seal.
3. The shaft seal assembly of a high temperature steam screw machine of claim 1 or 2 wherein said primary seal is a mechanical seal or a dry gas seal.
4. The shaft seal device of a high-temperature steam screw machine according to claim 1, wherein the cooling water inlet pipe and the water return pipe are respectively provided with a first flowmeter and a second flowmeter.
5. The shaft seal device of a high temperature steam screw machine according to claim 1, wherein the other end of the cooling water inlet pipe is communicated with a water pump.
6. The shaft seal device of a high temperature steam screw machine according to claim 1 or 5, characterized in that the cooling water inlet pipe is provided with a pressure gauge for detecting the water pressure of the cooling water inlet pipe.
7. The shaft seal assembly of a high temperature steam screw machine of claim 1 wherein said screw machine is a screw compressor or a screw expander.
8. The shaft seal apparatus of a high temperature steam screw machine according to claim 1, wherein the plurality of through holes are equally spaced along a circumferential direction of the leading seal side wall.
9. A pressure control method of a shaft sealing device of a high temperature steam screw machine according to any one of claims 1 to 8, comprising the steps of:
setting the pressure set value of the pressure transmitter to be 0.2-0.3 MPa higher than the pressure P1 of the steam working cavity of the high-temperature steam screw machine, and controlling the opening of the second flow regulating valve through the pressure transmitter so as to enable the return water pressure P3 in the return water pipe to reach the set value;
setting a temperature set value of the temperature transmitter, and controlling the opening degree of the first flow regulating valve through the temperature transmitter; the temperature set value is such that the cooling water inlet pressure P2 in the cooling water inlet pipe is 0.1-0.2 MPa higher than the return water pressure P3;
the pressure P4 of the sealing medium injected into the main seal is set to be 0.1-0.2 MPa higher than the cooling water inlet pressure P2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611210619.0A CN106640202B (en) | 2016-12-24 | 2016-12-24 | Shaft seal device of high-temperature steam screw machine and pressure control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611210619.0A CN106640202B (en) | 2016-12-24 | 2016-12-24 | Shaft seal device of high-temperature steam screw machine and pressure control method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106640202A CN106640202A (en) | 2017-05-10 |
| CN106640202B true CN106640202B (en) | 2022-08-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611210619.0A Active CN106640202B (en) | 2016-12-24 | 2016-12-24 | Shaft seal device of high-temperature steam screw machine and pressure control method thereof |
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| Country | Link |
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| CN (1) | CN106640202B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107269315B (en) * | 2017-07-31 | 2019-08-09 | 上海齐耀膨胀机有限公司 | Screw machine sealing system for cryogenic media gas and the method that prevents seal failure |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5147015A (en) * | 1991-01-28 | 1992-09-15 | Westinghouse Electric Corp. | Seal oil temperature control method and apparatus |
| CN201636324U (en) * | 2010-03-23 | 2010-11-17 | 南京林业大学 | Active Adaptive Control Mechanical Seal Device |
| CN102305105A (en) * | 2011-08-04 | 2012-01-04 | 上海齐耀膨胀机有限公司 | Sealing structure of screw expander |
| CN102454626A (en) * | 2010-10-21 | 2012-05-16 | 株式会社神户制钢所 | Compressor |
| CN103328325A (en) * | 2010-12-02 | 2013-09-25 | Abb有限公司 | Seal assembly for a propulsion shaft and method for sealing a propulsion shaft |
| CN104364567A (en) * | 2012-06-04 | 2015-02-18 | 贺尔碧格压缩机技术控股有限公司 | Sealing assembly for sealing a reciprocating piston rod of a reciprocating compressor |
| CN204573108U (en) * | 2014-12-15 | 2015-08-19 | 邓海波 | Screw shaft of ship numerical control magnetic fluid intelligence seal arrangement |
| CN106195272A (en) * | 2016-08-30 | 2016-12-07 | 中国铁建重工集团有限公司 | Driving owner drives seal pressure control system and control method thereof |
| CN206376900U (en) * | 2016-12-24 | 2017-08-04 | 上海齐耀膨胀机有限公司 | The gland seal device of high-temperature steam screw machine |
-
2016
- 2016-12-24 CN CN201611210619.0A patent/CN106640202B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5147015A (en) * | 1991-01-28 | 1992-09-15 | Westinghouse Electric Corp. | Seal oil temperature control method and apparatus |
| CN201636324U (en) * | 2010-03-23 | 2010-11-17 | 南京林业大学 | Active Adaptive Control Mechanical Seal Device |
| CN102454626A (en) * | 2010-10-21 | 2012-05-16 | 株式会社神户制钢所 | Compressor |
| CN103328325A (en) * | 2010-12-02 | 2013-09-25 | Abb有限公司 | Seal assembly for a propulsion shaft and method for sealing a propulsion shaft |
| CN102305105A (en) * | 2011-08-04 | 2012-01-04 | 上海齐耀膨胀机有限公司 | Sealing structure of screw expander |
| CN104364567A (en) * | 2012-06-04 | 2015-02-18 | 贺尔碧格压缩机技术控股有限公司 | Sealing assembly for sealing a reciprocating piston rod of a reciprocating compressor |
| CN204573108U (en) * | 2014-12-15 | 2015-08-19 | 邓海波 | Screw shaft of ship numerical control magnetic fluid intelligence seal arrangement |
| CN106195272A (en) * | 2016-08-30 | 2016-12-07 | 中国铁建重工集团有限公司 | Driving owner drives seal pressure control system and control method thereof |
| CN206376900U (en) * | 2016-12-24 | 2017-08-04 | 上海齐耀膨胀机有限公司 | The gland seal device of high-temperature steam screw machine |
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| CN106640202A (en) | 2017-05-10 |
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Address after: 201108 Shanghai city Minhang District Huaning Road No. 3111 Patentee after: Shanghai Qiyao Energy saving Technology Co.,Ltd. Country or region after: China Address before: 201108 Shanghai city Minhang District Huaning Road No. 3111 Patentee before: SHANGHAI QIYAO EXPANDER Co.,Ltd. Country or region before: China |