CN104747490B - Bearing-oil-sealed buffer gas pressure control method - Google Patents
Bearing-oil-sealed buffer gas pressure control method Download PDFInfo
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- CN104747490B CN104747490B CN201510084613.2A CN201510084613A CN104747490B CN 104747490 B CN104747490 B CN 104747490B CN 201510084613 A CN201510084613 A CN 201510084613A CN 104747490 B CN104747490 B CN 104747490B
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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 to a kind of oil-tightening buffering air pressure of bearing
Force control method.
Background technology
Svk series of compressor belongs to gear up formula centrifugal compressor, is widely used in oil, chemical industry, space division, medicine etc.
Field.Svk centrifugal compressor in operation process, rotor part high-speed rotation, rotor bearing must assure that sufficient lubrication and
Cooling provides lubricating oil it is therefore desirable to be equipped with lubricating oil station for bearing.But medium after compressor compression for a lot of industry requirements
In to guarantee absolute oil-free, therefore currently generally bearing side oil seal adopt labyrinth type oil seal, oil seal setting buffering gas
Chamber, is inwardly inflated by the outside buffering source of the gas that introduces by pipeline, prevents lubricating oil from revealing to sealing gland side, it is to avoid to be mixed into profit in medium
Lubricating oil.
Pressure due to buffering source of the gas in actual use is fluctuation, if buffering bleed pressure is too low, enters slow
The buffering air pressure power in qi of chong channel ascending adversely chamber is too low, is easily caused lubricating oil and scurries in the middle of the medium of compressor compresses, compressed media is caused
Pollution；If buffering bleed pressure is too high, the buffering air pressure power entering buffering air cavity can be too high, then easily cause lubricating oil random
Splashing, lubricating oil is brought into sealing gland side, still result in compressed media be contaminated.This is accomplished by constantly having staff to arrive
The pressure value of buffering gas is checked at scene, and when buffering bleed pressure reduction or raising, manually regulating guarantee buffers the pressure of gas
Power is stable, causes the waste of human resources, and as the problem that there is also pollution compressed media can not be adjusted in time.
Content of the invention
The technical problem to be solved is to provide a kind of bearing oil seal being capable of adjust automatically buffering air pressure power
Buffering air pressure force control method.
For solving above-mentioned technical problem, the invention provides a kind of bearing oil-tightening buffering air pressure force control method, should
Method is to be run based on bearing oil-tightening buffering air pressure Force control system, and the oil-tightening buffering air pressure power of described bearing controls
System includes the buffering air cavity being arranged on described bearing oil seal, the sealing bleed air lines connecting with described buffering air cavity, with
The auxiliary line of described sealing bleed air lines connection, and be successively set on being used on described auxiliary line and stablize described auxiliary
The self-contained pressure regulator of buffering air pressure power in pipeline, pressure transmitter, for preventing the buffering gas in auxiliary line from falling
Stream check-valves, for control buffer gas flow lead to manometric stop valve for pressure gauge, for display buffer stream pressure pressure
Power table, controller and audible-visual annunciator；The method includes:
Qi of chong channel ascending adversely source of postponing enters the buffering gas of auxiliary line and sequentially passes through self-contained pressure regulator, pressure transmitter, only
Return valve and pressure gauge, sealed bleed air lines enter the first buffering air cavity and the second buffering air cavity, respectively compressor are turned at a high speed
Sub- blower fan side bearing oil seal and compressor low speed rotor motor side bearing oil seal pressure；
Buffering air pressure power after described self-contained pressure regulator adjusts self-contained pressure regulator；
Receive the buffering air pressure force signal of described pressure transmitter transmission, relatively described buffering air pressure by described controller
Power numerical signal and default value, and control startup compressor or described audible-visual annunciator to send warning according to comparative result.
Further, described buffering air pressure after described self-contained pressure regulator adjusts self-contained pressure regulator
Power includes:
When the buffering air pressure power after self-contained pressure regulator is increased to 0.26～0.28bar (g), Self-operated pressure is adjusted
Section valve turns down 5%～10% valve opening, makes the air pressure after self-contained pressure regulator be adjusted to 0.25bar (g)；Work as self-operated type
When buffering air pressure power after pressure-regulating valve is reduced to 0.22～0.24bar (g), self-contained pressure regulator leaves big 5%～
10% valve opening, makes the air pressure after self-contained pressure regulator be adjusted to 0.25bar (g).
Further, the described buffering air pressure force signal receiving described pressure transmitter transmission by described controller, than
More described buffering air pressure power numerical signal and default value, and startup compressor is controlled according to comparative result or sends warning bag
Include:
Buffering air pressure power is converted into by the current signal feeding that analog quantity is 4～20ma by described pressure transmitter described
The A/D converter of controller, carries out through described A/D converter obtaining buffering air pressure power numerical value simultaneously after analog/digital conversion
It is sent to described controller, and is compared with the preset value of the processing unit of described controller, when described buffering air pressure power number
When value is equal to or more than 0.2bar (g), described processing unit sends instruction and starts compressor；When described buffering air pressure power numerical value is little
In or when being equal to 0.05bar (g), the instruction of described processing unit starts audible-visual annunciator and reports to the police, and points out operating personnel to check fault.
Further, described buffering air cavity includes be arranged on compressor high speed rotor blower fan side bearing oil seal first
Buffering air cavity and the second buffering air cavity being arranged on compressor low speed rotor motor side bearing oil seal.
Further, described sealing bleed air lines are divided into two-way, and the buffering air cavity that a road buffers air cavity with described first enters
Gas port flange connects, and another road is connected with the buffering air cavity air inlet flange of the described second buffering air cavity.
Further, described sealing bleed air lines adopt the seamless steel pipe of φ 21mm, and described auxiliary line adopts φ 12mm
Seamless steel pipe, described sealing bleed air lines are 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 bearing oil-tightening buffering air pressure force control method that the present invention provides, by the regulation of self-contained pressure regulator
Effect, precise control can enter the buffering air pressure power that bearing of compressor oil seal buffers in air cavity, can prevent in oil seal
Lubricating oil is revealed or random splashing to sealing gland side, it is to avoid is mixed into lubricating oil in compressed media and causes compressed media to pollute, carries
The high quality for customer service, meets customer requirement.And protected due to the autoregulation of self-contained pressure regulator
Demonstrate,prove the stability of buffering air pressure, be not required to manual hand manipulation to adjust the pressure of buffering gas, not only reduce human factor band
The accident come, also reduces human resources simultaneously, improves production efficiency.Meanwhile, using pressure transmitter by buffering air pressure power
Signal sends into control system, can be started by control system instruction compression machine when buffering air pressure power is normal, and can be in buffering air pressure
When power is too small or interrupts, by control system, instruction audible-visual annunciator prompting operating personnel check fault it is ensured that compressor assembly
Safe and stable operation, improve the intellectuality of compressor operating, improve work and production efficiency.
Brief description
Fig. 1 is the structural representation of bearing provided in an embodiment of the present invention oil-tightening buffering air pressure Force control system.
Fig. 2 is compressor high speed rotor in bearing provided in an embodiment of the present invention oil-tightening buffering air pressure Force control system
Blower fan side bearing oil seal and the structural relation figure of the first buffering air cavity.
Fig. 3 is compressor low speed rotor in bearing provided in an embodiment of the present invention oil-tightening buffering air pressure Force control system
Motor side bearing oil seal and the structural relation figure of the second buffering air cavity.
Fig. 4 be bearing provided in an embodiment of the present invention oil-tightening buffering air pressure Force control system in sealing bleed air lines with
Buffering air cavity annexation figure.
Fig. 5 is the connection of auxiliary line in bearing provided in an embodiment of the present invention oil-tightening buffering air pressure Force control system
Relation schematic diagram.
Fig. 6 is pressure transmitter in bearing provided in an embodiment of the present invention oil-tightening buffering air pressure Force control system,
Interactively figure between control system and audible-visual annunciator.
Fig. 7 is the schematic flow sheet of bearing provided in an embodiment of the present invention oil-tightening buffering air pressure force control method.
Specific embodiment
Referring to Fig. 1, a kind of oil-tightening buffering air pressure Force control system of bearing provided in an embodiment of the present invention, including setting
On compressor high speed rotor blower fan side bearing oil seal 1 first buffers air cavity 2 and is arranged on compressor low speed rotor motor
The second buffering air cavity 4 on side bearing oil seal 3, buffers, with the first buffering air cavity 2, second, the sealing air entraining pipe that air cavity 4 connects
Line 5, the auxiliary line 9 being connected with sealing bleed air lines 5, and the Self-operated pressure being successively set on auxiliary line 9 are adjusted
Valve 8, pressure transmitter 10, check-valves 7 and pressure gauge 11.Pressure transmitter 10 is with the controller 12 controlling compressor to open even
Connect, controller 12 connects audible-visual annunciator 13.
Referring to Fig. 2, setting the first buffering air cavity 2, the first buffering on compressor high speed rotor blower fan side bearing oil seal 1
Buffering air cavity air inlet 20 is provided with air cavity 2.
Referring to Fig. 3, setting the second buffering air cavity 4, the second buffering on compressor low speed rotor motor side bearing oil seal 3
Buffering air cavity air inlet 21 is provided with air cavity 4.
Referring to Fig. 4, the sealing bleed air lines 5 being connected with auxiliary line 9 are divided into two-way, and a road seals bleed air lines 5 and pressure
The buffering air cavity air inlet 20 of the first buffering air cavity 2 on contracting machine high speed rotor blower fan side bearing oil seal 1 is connected by flange,
Another road seals the buffering gas of the second buffering air cavity 4 on bleed air lines 5 and compressor low speed rotor motor side bearing oil seal 3
Chamber air inlet 21 is connected by flange.
Referring to Fig. 5, self-contained pressure regulator 8 is connected directly between on auxiliary line 9, and self-contained pressure regulator 8 is permissible
By the buffering air pressure power in the autoregulation stablized auxiliary pipe line 9 of itself；Check-valves 7 is also directly connected to auxiliary line
On 9, check-valves 7 can prevent the buffering gas in auxiliary line 9 from flowing backwards；Pressure transmitter 10 be connected to by three-way connection 14 with
On the arm 18 that auxiliary line 9 connects, the arm 18 that pressure transmitter 10 is connected with three-way connection 14 is provided with cutting ferrule cut-off
Valve 16, for controlling buffer gas flow to lead to pressure transmitter 10；Pressure gauge 11 is connected to by threeway terminal fitting 15 and auxiliary
On the arm 19 that pipeline 9 connects, the arm 19 that pressure gauge 11 is connected with threeway terminal fitting 15 is provided with stop valve for pressure gauge
17, for controlling buffer gas flow to lead to pressure gauge 11, pressure gauge 11 can indicate the buffering air pressure power number in auxiliary line 9 in scene
Value.
Wherein, sealing bleed air lines 5 adopt the seamless steel pipe of φ 21mm, and auxiliary line 9 adopts the seamless steel pipe of φ 12mm,
Sealing bleed air lines 5 are connected by reducing ferrule fitting 6 with auxiliary line 9.
Referring to Fig. 6, pressure transmitter 10 is connected by shielded cable with controller 12, controller 12 and audible-visual annunciator 13
Connect also by shielded cable.
Wherein, controller 12 can be programmable controller (plc), it would however also be possible to employ dcs (dcs),
Controller 12 includes processing unit, A/D converter and communication unit；A/D converter can receive pressure transmitter
The buffering air pressure force signals of 10 feedings, carry out analog-to-digital conversion, and the signal after turning is delivered to processing unit, processing unit according to
The signal that A/D converter sends, controls and starts compressor or send warning.
Referring to Fig. 7, the oil-tightening buffering air pressure force control method of bearing provided in an embodiment of the present invention, walk including following
Rapid:
The buffering gas that step 10, qi of chong channel ascending adversely source of postponing enter auxiliary line 9 sequentially passes through self-contained pressure regulator 8, pressure
Transmitter 10, check-valves 7 and pressure gauge 11, sealed bleed air lines 5 enter the first buffering air cavity 2 and the second buffering air cavity 4, point
Other compressor high speed rotor blower fan side bearing oil seal 1 and compressor low speed rotor motor side bearing oil seal 3 are pressed, prevent
In lubricating oil in compressor high speed rotor blower fan side bearing oil seal 1 and compressor low speed rotor motor side bearing oil seal 3
Lubricating oil to sealing gland side reveal, it is to avoid be mixed into lubricating oil in medium；Wherein, buffering source of the gas adopts instrument air or low pressure nitrogen
Gas, supply gas pressure is 4-6bar (g).
Step 20, the buffering air pressure power after self-contained pressure regulator adjusts self-contained pressure regulator.That is: when certainly
When buffering air pressure power after power formula pressure-regulating valve 8 is increased 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 be adjusted to 0.25bar (g)；When Self-operated pressure is adjusted
When buffering air pressure power after section valve 8 is reduced to 0.22～0.24bar (g), big 5%～10% valve left by self-contained pressure regulator 8
Door aperture, makes the air pressure after self-contained pressure regulator 8 be adjusted to 0.25bar (g)；Need exist for it is emphasised that above parameter
Setting, is through, obtained from substantial amounts of emulation experiment and the specifically test at scene, not those of ordinary skill in the art pass through
Wired test just can obtain, and applicant is to take a large amount of human and material resources and the time just obtains above-mentioned data, so as to accurate
Control and enter the buffering air pressure power that bearing of compressor oil seal buffers in air cavity, the lubricating oil in oil seal can be prevented to sealing gland side
Reveal or random splashing, it is to avoid be mixed into lubricating oil in compressed media and cause compressed media to pollute.
Step 30, the buffering air pressure force signal being transmitted by the described pressure transmitter of described controller reception, relatively more described
Buffering air pressure power numerical signal and default value, and control startup compressor or described audible-visual annunciator to send according to comparative result
Report to the police.
Wherein, controller 12 receives the buffering air pressure force signal of pressure transmitter 10 transmission, and is believed according to buffering air pressure power
Number size controls to start compressor or send warning and includes: pressure transmitter 10 by buffering air pressure power be converted into analog quantity be 4～
The current signal of 20ma sends into the A/D converter of controller 12, carries out through A/D converter delivering to after analog/digital conversion
The processing unit of controller 12, after processing unit calculation process, output corresponding signal controls and starts compressor or send report
Alert.
Wherein, after processing unit calculation process, output corresponding signal controls and starts compressor or send warning inclusion
Following steps:
The preset value of the buffering air pressure being converted to through A/D converter power numerical value and processing unit is compared；
When buffering air pressure power numerical value is equal to or more than 0.2bar (g), processing unit sends instruction and starts compressor；
When buffering air pressure power numerical value buffering air pressure power is less than or equal to 0.05bar (g), processing unit instructs sound and light alarm
Device 13 is reported to the police, and points out operating personnel to check fault.
The oil-tightening buffering air pressure force control method of bearing provided in an embodiment of the present invention, concrete control process and work are former
Reason is as follows:
When buffering air pressure power reduces or raises, self-contained pressure regulator 8 can be stable by the adjustment effect of itself
Buffering air pressure power after self-contained pressure regulator 8 valve.When self-contained pressure regulator 8 downstream pressure fluctuates, self-operated type pressure
Force regulating valve 8 automatically adjusts buffering air pressure power, makes downstream pressure stable in 0.25bar (g).When self-contained pressure regulator 8 valve
When pressure rise is to 0.26～0.28bar (g) afterwards, self-contained pressure regulator 8 turns down about 5%～10% valve opening, will be from
Power formula pressure-regulating valve 8 downstream pressure is adjusted to 0.25bar (g)；When self-contained pressure regulator 8 downstream pressure is reduced to 0.22
During～0.24bar (g), about 5%～10% valve opening left by self-contained pressure regulator 8, by self-contained pressure regulator 8 valve
Pressure is adjusted to 0.25bar (g) afterwards.
Buffering air pressure power after self-contained pressure regulator 8 valve is also the condition of compressor start simultaneously, pressure transmitter
Buffering air pressure power is converted into the A/D converter that the current signal that analog quantity is 4～20ma sends into controller 12, warp by 10
A/D converter delivers to the processing unit of controller 12 after carrying out analog/digital conversion, after processing unit calculation process, control
The preset value of the buffering air pressure being converted to through A/D converter power numerical value and processing unit is compared by device 12 processed；When
When buffering air pressure power numerical value is equal to or more than 0.2bar (g), processing unit sends instruction and starts compressor；
Buffering air pressure power after self-contained pressure regulator 8 valve is too low or source of the gas interrupts, and self-contained pressure regulator 8 leaves
Spend continuous increase and still can not stablize self-contained pressure regulator 8 downstream pressure, lead to buffering air pressure power numerical value buffering air pressure power little
In or be equal to 0.05bar (g) when, processing unit instruction audible-visual annunciator 13 report to the police, point out operating personnel check fault, prevent press
Contracting medium is mixed into lubricating oil.
The bearing oil-tightening buffering air pressure force control method that the present invention provides, can stably buffer the buffering gas in air cavity
Pressure, prevents the lubricating oil in oil seal from revealing or random splashing to sealing gland side, can ensure that buffering gas system safety and stability fortune
OK.And it is not required to manual hand manipulation, reduce the accident that human factor is brought, reduce human resources simultaneously, improve production
Efficiency.
It should be noted last that, above specific embodiment only in order to technical scheme to be described and unrestricted,
Although being described in detail to the present invention with reference to example, it will be understood by those within the art that, can be to the present invention
Technical scheme modify or equivalent, without deviating from the spirit and scope of technical solution of the present invention, it all should be covered
In the middle of scope of the presently claimed invention.
Claims (7)
1. a kind of oil-tightening buffering air pressure force control method of bearing is it is characterised in that the method is oil-tightening based on bearing
Buffering air pressure Force control system and run, the oil-tightening buffering air pressure Force control system of described bearing includes being arranged on described bearing
Buffering air cavity on oil seal, the sealing bleed air lines connecting with described buffering air cavity, connect with described sealing bleed air lines
Auxiliary line, and be successively set on described auxiliary line for stablize buffering air pressure power in described auxiliary line from
Power formula pressure-regulating valve, pressure transmitter, for prevent in auxiliary line buffering gas flow backwards check-valves, for control buffering
Air-flow leads to manometric stop valve for pressure gauge, the pressure gauge for display buffer stream pressure, controller and audible-visual annunciator；
The method includes:
Postpone qi of chong channel ascending adversely source enter auxiliary line buffering gas sequentially pass through self-contained pressure regulator, pressure transmitter, check-valves
And pressure gauge, sealed bleed air lines enter the first buffering air cavity and the second buffering air cavity, respectively to compressor high speed rotor wind
Pusher side bearing oil seal and compressor low speed rotor motor side bearing oil seal pressure；
Buffering air pressure power after described self-contained pressure regulator adjusts self-contained pressure regulator；
Receive the buffering air pressure power numerical signal of described pressure transmitter transmission, relatively described buffering air pressure by described controller
Power numerical signal and default value, and control startup compressor or described audible-visual annunciator to send warning according to comparative result.
2. the oil-tightening buffering air pressure force control method of bearing according to claim 1 it is characterised in that described by institute
The buffering air pressure power after self-contained pressure regulator adjusts self-contained pressure regulator of stating includes:
When the buffering air pressure power after self-contained pressure regulator is increased to 0.26～0.28bar g, self-contained pressure regulator
Turn down 5%～10% valve opening, make the air pressure after self-contained pressure regulator be adjusted to 0.25bar g；Work as Self-operated pressure
When buffering air pressure power after regulating valve is reduced to 0.22～0.24bar g, big 5%～10% valve left by self-contained pressure regulator
Aperture, makes the air pressure after self-contained pressure regulator be adjusted to 0.25bar g.
3. the oil-tightening buffering air pressure force control method of bearing according to claim 2 it is characterised in that described by institute
State the buffering air pressure power numerical signal that controller receives described pressure transmitter transmission, relatively described buffering air pressure power numerical signal
With default value, and according to comparative result control start compressor or send warning include:
Buffering air pressure power is converted into by the current signal that analog quantity is 4～20ma by described pressure transmitter and sends into described control
The A/D converter of device, carries out through described A/D converter obtaining buffering air pressure power numerical value after analog/digital conversion and transmitting
To described controller, and it is compared with the preset value of the processing unit of described controller, when described buffering air pressure power numerical value etc.
In or more than 0.2bar g when, described processing unit send instruction start compressor；When described buffering air pressure power numerical value be less than or
During equal to 0.05bar g, described processing unit instruction starts audible-visual annunciator and reports to the police, and points out operating personnel to check fault.
4. the oil-tightening buffering air pressure force control method of bearing according to claim 1 it is characterised in that: described buffering gas
Chamber includes the first buffering air cavity being arranged on compressor high speed rotor blower fan side bearing oil seal and is arranged on compressor low speed
The second buffering air cavity on rotor electric machine side bearing oil seal.
5. the oil-tightening buffering air pressure force control method of bearing according to claim 4 it is characterised in that: described sealing is drawn
Gas pipeline is divided into two-way, and a road is connected with the buffering air cavity air inlet flange of the described first buffering air cavity, another road and described the
The buffering air cavity air inlet flange of two buffering air cavitys connects.
6. the oil-tightening buffering air pressure force control method of bearing according to claim 1 it is characterised in that: described sealing is drawn
Gas pipeline adopts the seamless steel pipe of φ 21mm, and described auxiliary line adopts the seamless steel pipe of φ 12mm, described sealing bleed air lines
It 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 it is characterised in that: institute
State buffering source of the gas and adopt instrument air or low-pressure nitrogen, 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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| 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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| CN104747490B true CN104747490B (en) | 2017-01-25 |
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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 |
| 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 |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS572498A (en) * | 1980-06-04 | 1982-01-07 | Hitachi Ltd | Protection device for oil film seal for centrifugal compressor |
| JPH07103189A (en) * | 1993-10-04 | 1995-04-18 | Mitsubishi Heavy Ind Ltd | Oil feeder of oil film seal |
| JP3438994B2 (en) * | 1995-04-26 | 2003-08-18 | 三菱重工業株式会社 | Thrust gas bearing surface pressure adjusting device |
| CN102094845B (en) * | 2011-03-07 | 2013-01-16 | 江苏金通灵流体机械科技股份有限公司 | Shaft seal device of air compressor |
| CN203114714U (en) * | 2012-11-07 | 2013-08-07 | 重庆通用工业(集团)有限责任公司 | Gas oil seal pressure boosting device for semi-open type centrifugal water chilling unit |
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