CN104747490A - Bearing-oil-sealed buffer gas pressure control method - Google Patents
Bearing-oil-sealed buffer gas pressure control method Download PDFInfo
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- CN104747490A CN104747490A CN201510084613.2A CN201510084613A CN104747490A CN 104747490 A CN104747490 A CN 104747490A CN 201510084613 A CN201510084613 A CN 201510084613A CN 104747490 A CN104747490 A CN 104747490A
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Abstract
The invention provides a bearing-oil-sealed buffer gas pressure control method. The method includes the steps that buffer gas entering an auxiliary pipe from a buffer gas source sequentially passes through a self-operated pressure regulator, a pressure transmitter, a check valve and a pressure gage and enters a first buffer gas cavity and a second buffer gas cavity through a seal gas guide pipe to apply pressure on bearing oil seal beside a compressor high-speed rotor draught fan and bearing oil seal beside a compressor low-speed rotor motor; the buffer gas pressure of the position behind the self-operated pressure regulator is adjusted through the self-contained pressure regulator; a buffer gas pressure signal transmitted by the pressure transmitter is received through a control device, the buffer gas pressure numerical value signal is compared with the preset value, and a compressor or an audible and visual alarm are controlled to be started and give out an alarm according to the comparison result. By means of the bearing-oil-sealed buffer gas pressure control method, the buffer gas pressure in the buffer gas cavities can be stabilized, the situation that the lubricating oil in the oil seal is leaked to the gas seal side or splashed randomly is prevented, and it can be guaranteed that the buffer gas system operates safely and stably.
Description
Technical field
The present invention relates to the bearing oil technical field of sealing technology of compressor, particularly the oil-tightening buffering air pressure force control method of a kind of bearing.
Background technique
SVK series of compressor belongs to gear up formula centrifugal compressor, is widely used in oil, chemical industry, empty point, medicine and other fields.SVK centrifugal compressor is in operation process, and rotor part high speed rotating, rotor bearing must ensure fully lubrication and cooling, and therefore needing to be equipped with lubricating oil station for bearing provides lubricant oil.But to guarantee in the medium of a lot of industry requirement after compressor compression definitely without oil, therefore current usually in the sealing of bearing side oil seal employing labyrinth type oil, oil seal arranges buffering air cavity, introduce buffering source of the gas by pipeline by outside inwardly to inflate, prevent lubricant oil from revealing to sealing gland side, avoid being mixed into lubricant oil in medium.
Because the pressure cushioning source of the gas is in actual use fluctuation, if buffering source of the gas hypotony, enter the cushion gas hypotony of buffering air cavity, easily cause lubricant oil to be scurried in the middle of the medium of compressor compresses, compressed media is polluted; If buffering source of the gas overpressure, the cushion gas pressure entering buffering air cavity can be too high, then easily cause the random splashing of lubricant oil, lubricant oil is brought into sealing gland side, compressed media still can be caused contaminated.This just needs constantly have staff to check the force value of cushion gas to scene, cushion source of the gas Pressure Drop low or raise time, the manually pressure stability of regulating guarantee cushion gas, causes the waste of human resources, and also there will be the problem polluting compressed media as do not regulated in time.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of oil-tightening buffering air pressure force control method of bearing that automatically can adjust cushion gas pressure.
For solving the problems of the technologies described above, the invention provides the oil-tightening buffering air pressure force control method of a kind of bearing, the method runs based on the oil-tightening buffering air pressure Force control system of bearing, described bearing oil-tightening buffering air pressure Force control system comprises the buffering air cavity be arranged in the sealing of described bearing oil, the sealing bleed air lines be communicated with described buffering air cavity, the auxiliary line be communicated with described sealing bleed air lines, and the self-contained pressure regulator for stablizing the cushion gas pressure in described auxiliary line be successively set on described auxiliary line, pressure transmitter, for the safety check preventing the cushion gas in auxiliary line from flowing backwards, manometric stop valve for pressure gauge is led to for controlling buffer gas flow, for the pressure gauge of display buffer stream pressure, controller and audible-visual annunciator, the method comprises:
The cushion gas of auxiliary line is entered successively through self-contained pressure regulator, pressure transmitter, safety check and pressure gauge from cushion gas source, enter the first buffering air cavity and the second buffering air cavity through sealing bleed air lines, respectively compressor high speed rotor blower fan side bearing oil seal and the sealing of compressor low speed rotor motor side bearing oil are exerted pressure;
The cushion gas pressure after self-contained pressure regulator is regulated by described self-contained pressure regulator;
Received the buffering air pressure force signal of described pressure transmitter transmission by described controller, more described cushion gas pressure numerical signal and the value preset, and send warning according to comparative result control startup compressor or described audible-visual annunciator.
Further, describedly to be comprised by the cushion gas pressure after described self-contained pressure regulator regulates self-contained pressure regulator:
When the cushion gas pressure after self-contained pressure regulator is elevated to 0.26 ~ 0.28bar (G), self-contained pressure regulator turns down 5% ~ 10% valve opening, makes the air pressure after self-contained pressure regulator adjust to 0.25bar (G); When the cushion gas pressure after self-contained pressure regulator is reduced to 0.22 ~ 0.24bar (G), large 5% ~ 10% valve opening left by self-contained pressure regulator, makes the air pressure after self-contained pressure regulator adjust to 0.25bar (G).
Further, the described buffering air pressure force signal being received the transmission of described pressure transmitter by described controller, more described cushion gas pressure numerical signal and the value preset, and control to start compressor or send warning to comprise according to comparative result:
Cushion gas pressure being converted to analog amount by described pressure transmitter is the A/D converter that the current signal of 4 ~ 20mA sends into described controller, carry out obtaining cushion gas pressure value after analog/digital conversion and being sent to described controller through described A/D converter, and compare with the predefined value of the processing unit of described controller, when described cushion gas pressure value is equal to or greater than 0.2bar (G), described processing unit sends instruction and starts compressor; When described cushion gas pressure value is less than or equal to 0.05bar (G), described processing unit instruction starts audible-visual annunciator and reports to the police, and alert checks fault.
Further, described buffering air cavity comprises the first buffering air cavity be arranged on compressor high speed rotor blower fan side bearing oil seal and the second buffering air cavity be arranged in the sealing of compressor low speed rotor motor side bearing oil.
Further, described sealing bleed air lines is divided into two-way, and the buffering air cavity suction port Flange joint of air cavity is cushioned on a road and described first, and the buffering air cavity suction port Flange joint of air cavity is cushioned on another road and described second.
Further, described sealing bleed air lines adopts the seamless steel pipe of Φ 21mm, and described auxiliary line adopts the seamless steel pipe of Φ 12mm, and described sealing bleed air lines is connected by reducing ferrule fitting with described auxiliary line.
Further, described buffering source of the gas adopts instrument air or low-pressure nitrogen, and the supply gas pressure of described buffering source of the gas is 4-6bar (G).
The oil-tightening buffering air pressure force control method of bearing provided by the invention, by the regulating action of self-contained pressure regulator, can accurately control to enter the cushion gas pressure in bearing of compressor oil seal buffering air cavity, can prevent the lubricant oil in oil seal from revealing or random splashing to sealing gland side, avoid being mixed into lubricant oil in compressed media and causing compressed media to pollute, improve the quality for customer service, meet customer requirement.And the stability of buffering air pressure is ensure that due to the autoregulation of self-contained pressure regulator, do not need manual hand manipulation to regulate the pressure of cushion gas, not only reduce the accident that personal factor is brought, also reduce human resources simultaneously, improve manufacturing efficiency.Simultaneously, utilize pressure transmitter that buffering air pressure force signal is sent into control system, can be started by control system instruction compression machine when cushion gas pressure is normal, and can at cushion gas pressure too small or interrupt time, fault is checked by control system instruction audible-visual annunciator alert, ensure that the safe and stable operation of compressor assembly, improve the intellectuality of compressor operating, improve work and manufacturing efficiency.
Accompanying drawing explanation
The structural representation of the oil-tightening buffering air pressure Force control system of bearing that Fig. 1 provides for the embodiment of the present invention.
In the oil-tightening buffering air pressure Force control system of bearing that Fig. 2 provides for the embodiment of the present invention, compressor high speed rotor blower fan side bearing oil seal and first cushions the structural relation figure of air cavity.
In the oil-tightening buffering air pressure Force control system of bearing that Fig. 3 provides for the embodiment of the present invention, compressor low speed rotor motor side bearing oil sealing and second cushions the structural relation figure of air cavity.
Bleed air lines and buffering air cavity annexation figure is sealed in the oil-tightening buffering air pressure Force control system of bearing that Fig. 4 provides for the embodiment of the present invention.
The annexation schematic diagram of auxiliary line in the oil-tightening buffering air pressure Force control system of bearing that Fig. 5 provides for the embodiment of the present invention.
Pressure transmitter in the oil-tightening buffering air pressure Force control system of bearing that Fig. 6 provides for the embodiment of the present invention, the interactively figure between control system and audible-visual annunciator.
The schematic flow sheet of the oil-tightening buffering air pressure force control method of bearing that Fig. 7 provides for the embodiment of the present invention.
Embodiment
See Fig. 1, the oil-tightening buffering air pressure Force control system of a kind of bearing that the embodiment of the present invention provides, comprise the first buffering air cavity 2 be arranged on compressor high speed rotor blower fan side bearing oil seal 1 and the second buffering air cavity 4 be arranged in compressor low speed rotor motor side bearing oil sealing 3, cushion air cavity 2, second and cushion with first the sealing bleed air lines 5 that air cavity 4 is communicated with, the auxiliary line 9 be communicated with sealing bleed air lines 5, and be successively set on self-contained pressure regulator 8, pressure transmitter 10, safety check 7 and the pressure gauge 11 on auxiliary line 9.The controller 12 that pressure transmitter 10 is opened with control compressor is connected, and controller 12 connects audible-visual annunciator 13.
See Fig. 2, compressor high speed rotor blower fan side bearing oil seal 1 is arranged on the first buffering air cavity 2, first buffering air cavity 2 and be provided with buffering air cavity suction port 20.
See Fig. 3, compressor low speed rotor motor side bearing oil sealing 3 is arranged on the second buffering air cavity 4, second buffering air cavity 4 and be provided with buffering air cavity suction port 21.
See Fig. 4, the sealing bleed air lines 5 be connected with auxiliary line 9 is divided into two-way, one tunnel sealing bleed air lines 5 cushion the buffering air cavity suction port 20 of air cavity 2 by Flange joint with first on compressor high speed rotor blower fan side bearing oil seal 1, and another road sealing bleed air lines 5 and compressor low speed rotor motor side bearing oil seal the buffering air cavity suction port 21 cushioning air cavity 4 in second on 3 and pass through Flange joint.
See Fig. 5, self-contained pressure regulator 8 is connected directly between on auxiliary line 9, and self-contained pressure regulator 8 can by the cushion gas pressure in the autoregulation stablized auxiliary pipe line 9 of itself; Safety check 7 is also connected directly between on auxiliary line 9, and safety check 7 can prevent the cushion gas in auxiliary line 9 from flowing backwards; Pressure transmitter 10 is connected on the arm 18 that is connected with auxiliary line 9 by tee union 14, the arm 18 that pressure transmitter 10 is connected with tee union 14 being provided with cutting ferrule stop valve 16, leading to pressure transmitter 10 for controlling buffer gas flow; Pressure gauge 11 is connected on the arm 19 that is connected with auxiliary line 9 by threeway END CONNECTOR 15, the arm 19 that pressure gauge 11 is connected with threeway END CONNECTOR 15 is provided with stop valve for pressure gauge 17, lead to pressure gauge 11 for controlling buffer gas flow, pressure gauge 11 on-the-spot can indicate the cushion gas pressure value in auxiliary line 9.
Wherein, sealing bleed air lines 5 adopts the seamless steel pipe of Φ 21mm, and auxiliary line 9 adopts the seamless steel pipe of Φ 12mm, and sealing bleed air lines 5 is connected by reducing ferrule fitting 6 with auxiliary line 9.
See Fig. 6, pressure transmitter 10 is connected by shielded cable with controller 12, and controller 12 is also connected by shielded cable with audible-visual annunciator 13.
Wherein, controller 12 can be programmable controller (PLC), and also can adopt distributed control system (DCS), controller 12 comprises processing unit, A/D converter and communication unit; A/D converter can receive the buffering air pressure force signal that pressure transmitter 10 is sent into, and carries out analog-to-digital conversion, and the signal after turning is delivered to processing unit, the signal that processing unit sends according to A/D converter, controls start compressor or send warning.
See Fig. 7, the oil-tightening buffering air pressure force control method of the bearing that the embodiment of the present invention provides, comprises the steps:
Step 10, enter the cushion gas of auxiliary line 9 from cushion gas source successively through self-contained pressure regulator 8, pressure transmitter 10, safety check 7 and pressure gauge 11, the first buffering air cavity 2 and the second buffering air cavity 4 is entered through sealing bleed air lines 5, respectively compressor high speed rotor blower fan side bearing oil seal 1 and compressor low speed rotor motor side bearing oil sealing 3 are exerted pressure, prevent the lubricant oil in the lubricant oil in compressor high speed rotor blower fan side bearing oil seal 1 and compressor low speed rotor motor side bearing oil sealing 3 from revealing to sealing gland side, avoid being mixed into lubricant oil in medium; Wherein, buffering source of the gas adopts instrument air or low-pressure nitrogen, and supply gas pressure is 4-6bar (G).
Step 20, regulate the cushion gas pressure after self-contained pressure regulator by self-contained pressure regulator.That is: when the cushion gas pressure after self-contained pressure regulator 8 is elevated to 0.26 ~ 0.28bar (G), self-contained pressure regulator 8 turns down 5% ~ 10% valve opening, makes the air pressure after self-contained pressure regulator 8 adjust to 0.25bar (G); When the cushion gas pressure after self-contained pressure regulator 8 is reduced to 0.22 ~ 0.24bar (G), large 5% ~ 10% valve opening left by self-contained pressure regulator 8, makes the air pressure after self-contained pressure regulator 8 adjust to 0.25bar (G); Here it is emphasized that the setting of above parameter, the test being through a large amount of emulation experiments and concrete scene obtains, not those of ordinary skill in the art just can be obtained by wired test, claimant takes a large amount of human and material resources and the time just obtains above-mentioned data, thus can accurately control to enter the cushion gas pressure in bearing of compressor oil seal buffering air cavity, can prevent the lubricant oil in oil seal from revealing or random splashing to sealing gland side, avoid being mixed into lubricant oil in compressed media and causing compressed media to pollute.
Step 30, to be received the buffering air pressure force signal that described pressure transmitter transmits by described controller, more described cushion gas pressure numerical signal and the value preset, and control to start compressor according to comparative result or described audible-visual annunciator sends warning.
Wherein, controller 12 receives the buffering air pressure force signal that pressure transmitter 10 transmits, and control to start compressor or send warning to comprise according to buffering air pressure force signal size: cushion gas pressure is converted to the A/D converter that analog amount is the current signal feeding controller 12 of 4 ~ 20mA by pressure transmitter 10, the processing unit delivering to controller 12 after analog/digital conversion is carried out through A/D converter, after processing unit calculation process, export corresponding signal and control start compressor or send warning.
Wherein, after processing unit calculation process, export corresponding signal and control to start compressor or send warning to comprise the steps:
The predefined value of the cushion gas pressure value be converted to through A/D converter and processing unit is compared;
When cushion gas pressure value is equal to or greater than 0.2bar (G), processing unit sends instruction and starts compressor;
When cushion gas pressure value cushion gas pressure is less than or equal to 0.05bar (G), processing unit instruction audible-visual annunciator 13 is reported to the police, and alert checks fault.
The oil-tightening buffering air pressure force control method of the bearing that the embodiment of the present invention provides, concrete control procedure and working principle as follows:
When cushion gas pressure reduces or raise, self-contained pressure regulator 8 can stablize the cushion gas pressure after self-contained pressure regulator 8 valve by the regulating action of self.When self-contained pressure regulator 8 downstream pressure fluctuates, self-contained pressure regulator 8 regulates cushion gas pressure automatically, makes downstream pressure be stabilized in 0.25bar (G).When self-contained pressure regulator 8 downstream pressure is elevated to 0.26 ~ 0.28bar (G), self-contained pressure regulator 8 turns down about 5% ~ 10% valve opening, and self-contained pressure regulator 8 downstream pressure is adjusted to 0.25bar (G); When self-contained pressure regulator 8 downstream pressure is reduced to 0.22 ~ 0.24bar (G), about 5% ~ 10% valve opening left by self-contained pressure regulator 8, and self-contained pressure regulator 8 downstream pressure is adjusted to 0.25bar (G).
Cushion gas pressure after self-contained pressure regulator 8 valve is also the condition of compressor start simultaneously, cushion gas pressure is converted to the A/D converter that analog amount is the current signal feeding controller 12 of 4 ~ 20mA by pressure transmitter 10, the processing unit delivering to controller 12 after analog/digital conversion is carried out through A/D converter, after processing unit calculation process, the predefined value of the cushion gas pressure value be converted to through A/D converter and processing unit compares by controller 12; When cushion gas pressure value is equal to or greater than 0.2bar (G), processing unit sends instruction and starts compressor;
When the cushion gas hypotony after self-contained pressure regulator 8 valve or source of the gas interrupt, self-contained pressure regulator 8 aperture constantly increases still can not stablize self-contained pressure regulator 8 downstream pressure, when causing cushion gas pressure value cushion gas pressure to be less than or equal to 0.05bar (G), processing unit instruction audible-visual annunciator 13 is reported to the police, alert checks fault, prevents compressed media to be mixed into lubricant oil.
The oil-tightening buffering air pressure force control method of bearing provided by the invention, can stablize the cushion gas pressure in buffering air cavity, prevents the lubricant oil in oil seal from revealing or random splashing to sealing gland side, can guarantee the stable operation of cushion gas security of system.And do not need manual hand manipulation, reduce the accident that personal factor is brought, reduce human resources simultaneously, improve manufacturing efficiency.
It should be noted last that, above embodiment is only in order to illustrate technological scheme of the present invention and unrestricted, although with reference to example to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technological scheme of the present invention or equivalent replacement, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (7)
1. the oil-tightening buffering air pressure force control method of bearing, it is characterized in that, the method runs based on the oil-tightening buffering air pressure Force control system of bearing, described bearing oil-tightening buffering air pressure Force control system comprises the buffering air cavity be arranged in the sealing of described bearing oil, the sealing bleed air lines be communicated with described buffering air cavity, the auxiliary line be communicated with described sealing bleed air lines, and the self-contained pressure regulator for stablizing the cushion gas pressure in described auxiliary line be successively set on described auxiliary line, pressure transmitter, for the safety check preventing the cushion gas in auxiliary line from flowing backwards, manometric stop valve for pressure gauge is led to for controlling buffer gas flow, for the pressure gauge of display buffer stream pressure, controller and audible-visual annunciator, the method comprises:
The cushion gas of auxiliary line is entered successively through self-contained pressure regulator, pressure transmitter, safety check and pressure gauge from cushion gas source, enter the first buffering air cavity and the second buffering air cavity through sealing bleed air lines, respectively compressor high speed rotor blower fan side bearing oil seal and the sealing of compressor low speed rotor motor side bearing oil are exerted pressure;
The cushion gas pressure after self-contained pressure regulator is regulated by described self-contained pressure regulator;
Received the buffering air pressure force signal of described pressure transmitter transmission by described controller, more described cushion gas pressure numerical signal and the value preset, and send warning according to comparative result control startup compressor or described audible-visual annunciator.
2. the oil-tightening buffering air pressure force control method of bearing according to claim 1, is characterized in that, is describedly comprised by the cushion gas pressure after described self-contained pressure regulator regulates self-contained pressure regulator:
When the cushion gas pressure after self-contained pressure regulator is elevated to 0.26 ~ 0.28bar (G), self-contained pressure regulator turns down 5% ~ 10% valve opening, makes the air pressure after self-contained pressure regulator adjust to 0.25bar (G); When the cushion gas pressure after self-contained pressure regulator is reduced to 0.22 ~ 0.24bar (G), large 5% ~ 10% valve opening left by self-contained pressure regulator, makes the air pressure after self-contained pressure regulator adjust to 0.25bar (G).
3. the oil-tightening buffering air pressure force control method of bearing according to claim 2, it is characterized in that, the described buffering air pressure force signal being received the transmission of described pressure transmitter by described controller, more described cushion gas pressure numerical signal and the value preset, and control to start compressor or send warning to comprise according to comparative result:
Cushion gas pressure being converted to analog amount by described pressure transmitter is the A/D converter that the current signal of 4 ~ 20mA sends into described controller, carry out obtaining cushion gas pressure value after analog/digital conversion and being sent to described controller through described A/D converter, and compare with the predefined value of the processing unit of described controller, when described cushion gas pressure value is equal to or greater than 0.2bar (G), described processing unit sends instruction and starts compressor; When described cushion gas pressure value is less than or equal to 0.05bar (G), described processing unit instruction starts audible-visual annunciator and reports to the police, and alert checks fault.
4. the oil-tightening buffering air pressure force control method of bearing according to claim 1, is characterized in that: described buffering air cavity comprises the first buffering air cavity be arranged on compressor high speed rotor blower fan side bearing oil seal and the second buffering air cavity be arranged in the sealing of compressor low speed rotor motor side bearing oil.
5. the oil-tightening buffering air pressure force control method of bearing according to claim 4, it is characterized in that: described sealing bleed air lines is divided into two-way, the buffering air cavity suction port Flange joint of air cavity is cushioned on one tunnel and described first, and the buffering air cavity suction port Flange joint of air cavity is cushioned on another road and described second.
6. the oil-tightening buffering air pressure force control method of bearing according to claim 1, it is characterized in that: described sealing bleed air lines adopts the seamless steel pipe of Φ 21mm, described auxiliary line adopts the seamless steel pipe of Φ 12mm, and described sealing bleed air lines is connected by reducing ferrule fitting with described auxiliary line.
7. the oil-tightening buffering air pressure force control method of the bearing according to any one of claim 1-6, is characterized in that: described buffering source of the gas adopts instrument air or low-pressure nitrogen, and the supply gas pressure of described buffering source of the gas is 4-6bar (G).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510084613.2A CN104747490B (en) | 2015-02-16 | 2015-02-16 | Bearing-oil-sealed buffer gas pressure control method |
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| CN201510084613.2A CN104747490B (en) | 2015-02-16 | 2015-02-16 | Bearing-oil-sealed buffer gas pressure control method |
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| CN104747490B CN104747490B (en) | 2017-01-25 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109578317A (en) * | 2018-12-29 | 2019-04-05 | 沈阳鼓风机集团自动控制系统工程有限公司 | A kind of control method and device of centrifugal compressor lubricating oil system |
| CN109630380A (en) * | 2018-12-07 | 2019-04-16 | 山西焦化股份有限公司 | A kind of device reducing the flammable Gas content of feed gas compressor crankcase |
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| JPS572498A (en) * | 1980-06-04 | 1982-01-07 | Hitachi Ltd | Protection device for oil film seal for centrifugal compressor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109630380A (en) * | 2018-12-07 | 2019-04-16 | 山西焦化股份有限公司 | A kind of device reducing the flammable Gas content of feed gas compressor crankcase |
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| CN109578317B (en) * | 2018-12-29 | 2020-07-31 | 沈阳鼓风机集团自动控制系统工程有限公司 | Control method and device for lubricating oil system of centrifugal compressor |
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| CN104747490B (en) | 2017-01-25 |
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