CN106763791A - The seal clearance control system and control method of a kind of non-contact mechanical seal - Google Patents
The seal clearance control system and control method of a kind of non-contact mechanical seal Download PDFInfo
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- CN106763791A CN106763791A CN201611156670.8A CN201611156670A CN106763791A CN 106763791 A CN106763791 A CN 106763791A CN 201611156670 A CN201611156670 A CN 201611156670A CN 106763791 A CN106763791 A CN 106763791A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/3436—Pressing means
- F16J15/3444—Pressing means by magnetic attraction
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mechanical Sealing (AREA)
Abstract
The seal clearance control system and control method of a kind of non-contact mechanical seal, including：Torque rotary speed sensor in rotating shaft, the displacement transducer on step on the outside of stationary ring, the coil being wrapped on stationary ring and control circuit；The control circuit is connected with the torque rotary speed sensor, institute's displacement sensors, the coil respectively；The torque rotary speed sensor is used to detect the rotating speed of mechanical seal；Institute's displacement sensors are used to detect the distance between stationary ring and rotating ring；The control circuit realizes the repulsion or suction between adjustment rotating ring and stationary ring according to the rotating speed of mechanical seal rotating shaft, the distance between rotating ring and stationary ring, the size and Orientation of control coil electric current.The present invention makes the opening force or closing force of the dynamic and static ring of non-contact mechanical seal obtain magnetic compensation, is prevented effectively from or reduces unfavorable factor to sealing the influence of running quality, the advantage of zero leakage non-contact mechanical seal is not fully exerted.
Description
Technical field
The present invention relates to the seal clearance control system and control method of a kind of non-contact mechanical seal of Magnetic Control,
The controllability of seal clearance size can be realized, to ensure seal face stabilized fluid lubrication and zero leakage performance.
Background technology
With the development of industrial technology, to the performance requirement more and more higher of mechanical seal, in some high pressures, high speed, high temperature
Under etc. operating mode, the particularly field such as some Aero-Space, nuclear power station, petrochemical industry, it is desirable to which zero leakage, deformation are realized in mechanical seal
Small, long lifespan.Additionally, higher and higher energy-conserving and environment-protective target call, also cause to improve the stability of mechanical seal and life-span into
It is the problem that mechanical seal manufacture field is deeply concerned and payes attention to.
In order to realize zero leakage and the prolonged mechanical sealing service life of mechanical seal, current research is mainly by close
The surface micro-moulding and combination sealing in end-blocking face realize " noncontact " and " zero leakage ", and achieve certain effect.It is Chinese special
Sharp CN101701585A, CN2534428Y, CN103527792B etc. disclose the upstream pumping mechanical seal ring of different structure, its
Pumpability and dynamic pressure effect, can reduce leakage rate, reduce the degree of wear, extend the service life of sealing pair；United States Patent (USP)
US2015345641A1 discloses a kind of combination groove profile mechanical seal, can effectively reduce end-face friction, increases lubricating end surface simultaneously
Promote end face cooling.But, above patent does not all solve problems with very well：Moment when mechanical seal is started shooting opens energy
Wear problem when power, parking, and the non-contacting precondition of end face is kept in running --- with certain thickness
Stabilized fluid film problem.
Anqing Petrochemical Company is summarized for fortune company Zhou Yongsheng《Magnetic mechanical seal method for designing and the problem of presence》(machinery
The 5th phase of volume 31 in 2004), it is believed that the diameter of axle is big, axial space is short, sealed medium pressure is low, the sealing of low this kind equipment of rotating speed
Problem, can select magnetic force contacting mechanical seal.Magnetic force contacting mechanical seal is to produce enough drawing using magnetic fields
Power, makes compensation ring, uncompensated ring friction fit face not to occur separating because of reasons such as bounces；Deformed using rubber seal,
Sufficiently large torque is produced between axle and compensated ring adaptor with balanced seal face moment of friction, it is ensured that compensated ring component is same with axle
Step is rotated.Identical with common contact-type mechanical seal, the friction pair of magnetic mechanical seal is integral loop, therefore, its working condition
Stabilization, dielectric leakage amount is few, and usage cycles are long.But this magnetic field gravitation is to play replacement seal closing force or further increase
The effect of closing force, excessive increase closing force will also increase face pressure, unstable wear；If additionally, due to installation, bounce etc.
Reason, opens seal face, at this moment compensates ring and increases with the distance of uncompensated ring, and magnetic field gravitation will weaken rapidly, if do not had
There is an intervention of external force, the effect of the sealing ring resistance of motion may cause the seal face cannot to fit again.Chinese patent
CN202971937U, CN101392837A, CN2101141U disclose the contact magnetic mechanical sealing device of different structure, its
Feature is to keep end face laminating using magnetic force, and simple structure enhances sealing reliability；Chinese patent CN2497116Y is disclosed
A kind of improved contact magnetic sealing device, can make sealing surface that there is more preferable freedom from vibration, impact resistance and sealing to follow
Property；Chinese patent CN203500461U discloses one kind and presses closer positioning contact magnetic mechanical seal part, replaces equivalent magnetic field power
For the unstable elastic force of mechanical seal spring, so as to extend the service life of seal member.Knowable to above patent, they
All there is a problem of that sealing force is limited, end wear is serious, frictional heating amount is big, short life.Korean Patent KR20160079568
A kind of magnetic fluid mechanically-sealing apparatus are disclosed, the magnetic force produced using circle distribution permanent magnet on axle is controlled to magnetic fluid
And sealing purpose is reached, but magnetic fluid is easily by medium, it is impossible to and the seal pressure that form stabilized seal face and can bear is limited；
United States Patent (USP) US5267007 discloses a kind of magnetic sealing device for preventing axial end from leaking, and is produced using ferromagnetic material
Magnetic-adsorption magnetic-particle, prevent leakage, but magnetic force can with adsorption particle increase weaken, easily cause leakage；The U.S. is special
Sharp US8474826B2, US2006244221A1 disclose a kind of magnetic mechanical seal of end face moulding, and magnetic force is to play sealing
The effect of closing force, groove profile is opened up in end face, and fluid film is formed using the dynamic pressure effect of groove, reaches the mesh for reducing end face abrasion
, but fluid film easy unstability under vibration or variable working condition, easily cause leakage or wear and tear.
In sum, moment when existing end face moulding non-contact mechanical seal not can solve start opens
Wear problem when ability and parking, and seal clearance fluid stability is not enough；And magnetic force contacting mechanical seal, installing not
Accurately, under the reason such as vibration, it is impossible to control the floating compensation of end face.It can be seen that, these sealings for proposing in the prior art both at home and abroad
Leakage, abrasion and stability problem are not can effectively solve the problem that, and sealing property fails to reach preferable state.
The content of the invention
The reason for causing above-mentioned seal defect is a lack of the controlling mechanism of magnetic compensation effect, and the present invention is asked for this
Topic, by a Magnetic Control system, reaches the purpose of control non-contacting mechanical seal end clearance size, while can solve the problem that
Moment opening force during start and wear problem when stopping, it is ensured that the stable operation of non-contacting mechanical seal.
The technical solution adopted in the present invention is：
(dynamic pressure groove is opened up in rotating ring end face, its groove profile can be spiral line type, circular arc line in non-contact mechanical seal
Type, bias type, T fonts, chevron shaped etc., groove depth are 5~10 μm, and slot number is 6~20) on the basis of, rotating ring, stationary ring use magnetic
Property high-abrasive material make；Torque rotary speed sensor is installed in rotating shaft, the rotating speed of acquisition is converted into electric signal input switch dress
Put, to reach the control of starting up's circuit, shut down and close circuit control；Wound on stationary ring circumferential surface and wrapped up through waterproof material
Coil, and be fixed on stationary ring, meanwhile, optical fibre displacement sensor is installed on step on the outside of stationary ring, for measuring rotating ring
Axial displacement is simultaneously converted into electric signal and passes to control circuit, and control circuit can be logical according to the strong and weak adjustment of sensor electric signal
Size of current and the direction of coil are crossed, the purpose of seal clearance size is controlled at any time so as to reach, makes non-contact mechanical seal
Performance reach more satisfactory state.
Specifically control principle is：Under the effect of the electromagnetic induction of stationary ring coil, rotating ring is magnetized, and produces fixed magnetic pole；
Divide following several situations：
Before sealing ring starts running, in the case that coil electricity makes rotating ring magnetize and to form fixed magnetic pole, sealing ring starts
While operating, rotating speed is measured by speed probe, be converted into electric signal input switch device, automatically turn on coil current control
Circuit system, now because seal clearance is less than 1.5 μm, control coil sense of current makes dynamic and static ring produce repulsion, accelerates gap
Formation, reduce end-face friction, improve open performance.
Started running to during the entire process of shutting down in sealing ring, according to the position that optical fibre displacement sensor is measured in real time
Move high low signal, the size and Orientation of coil current changed by controlling circuit so that dynamic and static ring produce suction or repulsion with
The deficiency of compensation closing force or opening force, can be set as normal seal clearance size, in normal seal clearance by 1.5~5.5 μm
In the range of coil current control circuit system be automatically stopped work, sealing is in nature running status；When seal clearance is less than 1.5
μm when, the direction of coil current will make dynamic and static ring produce repulsive force, and the reduction to seal clearance plays interception；When between sealing
When gap is more than 5.5 μm, the direction of coil current will make dynamic and static ring produce attraction, prevent the increase of seal clearance；It is rotating ring, quiet
The size of ring generation suction or repulsion can be realized by changing the size of coil current.
When sealing ring deceleration, seal clearance are down to 1.5 μm, produce repulsion again by dynamic and static ring and reduce end face and rub
Wipe, improve and shut down performance.
When sealing ring stops operating, rotating speed is measured by speed probe, be converted into electric signal input switch device, automatically
Coil current control circuit system is closed, dynamic and static ring repulsion is disappeared and closing seam.
Beneficial effects of the present invention：
(1) opening force of the dynamic and static ring of non-contact mechanical seal is made by the control of the direction of the winding current and size or is closed
Make a concerted effort to obtain magnetic compensation, be prevented effectively from or reduce unfavorable factor to sealing the influence of running quality, seal clearance control is existed
More satisfactory state, can make the advantage of zero leakage non-contact mechanical seal be not fully exerted.
(2) by the control of the dynamic and static czermak space of non-contact mechanical seal, sealing can be greatly decreased and opens, shuts down the stage
End wear, is effectively improved out, shuts down performance, sealing life is significantly extended.
Brief description of the drawings
Fig. 1 is rotating ring end face structure schematic diagram of the invention.
Fig. 2 is dynamic and static ring assembling schematic diagram of the invention and stationary ring coil control circuit schematic diagram.
Fig. 3 is sealing principle schematic diagram of the invention.
Fig. 4 is the systematic schematic diagram of circuit controller control fluid gap stabilization.
Description of symbols：1-torque speed sensor；2-control circuit；3-gland；4-stop pin；5-stationary ring O shapes
Circle；6-stationary ring；7-coil；8-displacement transducer；9-rotating ring；10-rotating ring O-ring；11-trundle；12-throw-out collar；
13-spring；14-spring base；15-holding screw；16-transmission screw.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.
As shown in figure 1, being paired cylindric wear part the present invention relates to mechanical seal, wherein rotating ring is resistance to using Hard Magnetic
Mill material, stationary ring use soft magnetism high-abrasive material.Opened up on rotating ring end face along the symmetrical pumping helicla flute of pivot, groove
It is deep 5~10 μm, slot number 6~20；End face micro forming can be using the processing of the techniques such as electric spark, electrochemical corrosion, Laser Processing.
As shown in Fig. 2 being control system and the assembling schematic diagram of mechanical seal.Wound around coil on stationary ring 6, the work of rotating ring 9
Make the opposite face that face is dynamic and static ring, be shaped as annular shape, there is a laminar flow body space h between rotating ring and stationary ring, be dynamic by what is opened up
What die mould groove was produced.
As shown in figure 3, being the operation principle of sealing ring.Rotating ring by trundle 11, throw-out collar 12, spring 13, spring base 14,
Holding screw 15, transmission screw 16 are fixed on axle, are rotated together with axle, and stationary ring is fixed on shell by stop pin 4.Operation
When, rotating ring rotation, when rotating speed reaches certain limit, groove produces obvious dynamic pressure effect, and one layer is produced between rotating ring and stationary ring
Fluid gap film.
Torque rotary speed sensor 1 is installed in rotating shaft, rotating speed will be obtained and be converted into electric signal input torque relay switch
Circuit, to reach the control of starting up's circuit, shuts down and closes circuit control；Wound on stationary ring circumferential surface through waterproof material bag
The coil 7 wrapped up in, and be fixed on stationary ring 6, in design, length of bench on the outside of increase stationary ring, convenient to install optical fibre displacement sensor
8, and it is met sensor measurement range, optical fibre displacement sensor 8 is used for measuring the axial displacement of rotating ring and being converted into electricity
Signal transmission gives control circuit 2, control circuit can according to the strong and weak adjustment of sensor electric signal by the size of current of coil and
Direction, so as to reach at any time control seal clearance size purpose, make non-contact mechanical seal performance reach it is more satisfactory
State.
It is illustrated in figure 4 control principle schematic diagram of the present invention.Implication first to signal is described as follows：
n：Rotating shaft rotating speed；
d：By measuring rotating shaft rotating speed, the electric signal of torque speed sensor output；
r+：Fluid film thickness data signal input value during stable operation；
e：By comparing the signal that summation algorithm is exported, usually two algebraical sums of signal；
I：The electric current that circuit is input into coil；
I’：In rotating ring displacement process, the electric current that stationary ring coil cutting magnetic induction line is produced；
B：The magnetic field intensity that stationary ring coil is produced；
S：The offset distance of rotating ring；
b：By measuring rotating ring displacement, the electric signal of optical fibre displacement sensor output；
b-：The Displacement Feedback circuit digital signal of summation algorithm is compared in input；
CP：Compare summation operation algorithm；
Specific control process：Under the effect of the electromagnetic induction of stationary ring coil, rotating ring 9 is magnetized, and produces fixed magnetic pole；Point
It is following several situations：1. before sealing ring start, in the case that coil electricity makes rotating ring magnetize and to form fixed magnetic pole, sealing ring
While start operating, rotating speed is measured by torque speed sensor 1, is converted into electric signal input torque relay switching circuit,
Coil current control circuit 2 is automatically turned on, now because seal clearance is less than 1.5 μm, the direction of coil current will produce dynamic and static ring
Raw repulsion, accelerates the formation in gap, reduces end-face friction, improves and opens performance.2. deceleration, seal clearance drop are shut down in sealing ring
During to 1.5 μm, produce repulsion again by control rotating ring, stationary ring and reduce end-face friction, improve and shut down performance.3. in sealing ring
When stopping operating, it is 0 to measure rotating speed by torque speed sensor 1, is converted into electric signal input switch device, is automatically switched off coil
Current control circuit system, makes rotating ring, stationary ring repulsion disappear and closing seam.4. in sealing start to the whole process shut down
In, according to the displacement signal that the device of method using in optic fiber displacement sensor 8 is measured in real time, converted by amplification, A/D, corrected, Regulate signal matter
Data signal is measured and be converted into, by PLC, displacement signal corresponding current signal is converted into, then can by IGCT
Control fairing changes the size and Orientation of coil current, so as to change magnetic field, make rotating ring 9, stationary ring 6 produce suction or repulsion with
The deficiency of compensation closing force or opening force.The present invention is set as normal seal clearance size by 1.5~5.5 μm, specifically by r+
3.5 μm are set to, s is fed back to ± 2 μm.Coil current control circuit system is automatically stopped work in the range of normal seal clearance,
Sealing is in nature running status；When seal clearance is less than 1.5 μm (s is less than -2 μm), control coil sense of current makes
Rotating ring 9, stationary ring 6 produce repulsive force, and the reduction to seal clearance plays interception；When seal clearance is more than 5.5 μm, (s is big
In 2 μm), control coil sense of current makes rotating ring, stationary ring produce attraction, prevents the increase of seal clearance；Wherein, rotating ring,
The size of stationary ring generation suction or repulsion can be realized by changing the size of coil current.
The above, only enumerating to the way of realization of present inventive concept, not makees any type of to the present invention
Limitation, protection scope of the present invention includes those skilled in the art according to the thinkable equivalent technologies mean of present inventive concept institute,
It is all to make change, modification and differentiation of any equivalent variations etc. to above example according to the present invention, belong to guarantor of the invention
Shield scope.
Claims (9)
1. the seal clearance control system of a kind of non-contact mechanical seal, it is characterised in that including：Turning in rotating shaft
Square speed probe, the displacement transducer on step on the outside of stationary ring, the coil being wrapped on stationary ring and control circuit；
The control circuit is connected with the torque rotary speed sensor, institute's displacement sensors, the coil respectively；The torque rotary speed
Sensor is used to detect the rotating speed of mechanical seal；Institute's displacement sensors are used to detect the distance between stationary ring and rotating ring；It is described
Control circuit is according to the rotating speed of mechanical seal rotating shaft, the distance between rotating ring and stationary ring, and the size and Orientation of control coil electric current is real
Now adjust the repulsion or suction between rotating ring and stationary ring.
2. the seal clearance control system of non-contact mechanical seal according to claim 1, it is characterised in that described quiet
Ring and the rotating ring are made of antiwear magnetic material.
3. the seal clearance control system of non-contact mechanical seal according to claim 2, it is characterised in that described quiet
Ring uses soft magnetism high-abrasive material；The rotating ring uses Hard Magnetic high-abrasive material.
4. the seal clearance control system of non-contact mechanical seal according to claim 1, it is characterised in that the line
Circle is wrapped up by waterproof material.
5. the seal clearance control system of non-contact mechanical seal according to claim 1, it is characterised in that the line
Circle can be wrapped in above rotating ring.
6. the seal clearance control system of non-contact mechanical seal according to claim 1, it is characterised in that the control
Circuit processed includes controller, moment of torsion relay switching circuit, silicon con trolled rectifier circuit；The moment of torsion relay switching circuit
One end connects the output end that the torque speed sensor, the other end connect silicon con trolled rectifier circuit；The displacement sensing
Device passes sequentially through the input of connection controller after amplifying circuit, A/D change-over circuits；The output end of the controller turns through D/A
The silicon con trolled rectifier circuit is connected after parallel operation；The silicon con trolled rectifier circuit output current gives the coil.
7. the seal clearance control system of non-contact mechanical seal according to claim 6, it is characterised in that the control
Device processed is realized using programmable controller PLC.
8. the seal clearance control method of a kind of non-contact mechanical seal, it is characterised in that
Before sealing ring starts running, coil electricity makes rotating ring magnetize to form fixed magnetic pole, while sealing ring starts running, by
Speed probe measures rotating speed, and rotating speed is converted into electric signal input torque relay switching circuit, automatically turns on coil current
Control circuit system；Now seal clearance is less than 1.5 μm, and control coil sense of current makes dynamic and static ring produce repulsion, between quickening
The formation of gap；
Started running to during the entire process of shutting down in sealing ring, the displacement letter that PLC is measured in real time according to displacement transducer
Number, by controlling silicon con trolled rectifier circuit, realize changing the size and Orientation of coil current, so that rotating ring, stationary ring are produced
Suction or repulsion is given birth to compensate the deficiency of closing force or opening force, the coil current control circuit system in the range of normal seal clearance
System is automatically stopped work, and sealing is in nature running status；When seal clearance is less than lower limit, control coil sense of current makes
Rotating ring, stationary ring produce repulsive force, and the reduction to seal clearance plays interception；When seal clearance is more than the upper limit, control coil
Sense of current makes rotating ring, stationary ring produce attraction, prevents the increase of seal clearance；
When sealing ring deceleration, seal clearance are down to lower limit, end-face friction is reduced by controlling rotating ring, stationary ring to produce repulsion,
Improve and shut down performance；
When sealing ring stops operating, it is 0 to measure rotating speed by speed probe, and input torque relay switching circuit is automatic to close
Abutment line loop current controls circuit system, rotating ring, stationary ring repulsion is disappeared and closing seam.
9. a kind of seal clearance control method of non-contact mechanical seal according to claim 8, it is characterised in that institute
State normal seal clearance scope and be set to 1.5~5.5 μm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611156670.8A CN106763791B (en) | 2016-12-15 | 2016-12-15 | A kind of seal clearance control method of non-contact mechanical seal |
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|---|---|---|---|
| CN201611156670.8A CN106763791B (en) | 2016-12-15 | 2016-12-15 | A kind of seal clearance control method of non-contact mechanical seal |
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| CN106763791A true CN106763791A (en) | 2017-05-31 |
| CN106763791B CN106763791B (en) | 2018-04-24 |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107882768A (en) * | 2017-10-27 | 2018-04-06 | 江苏大学 | A kind of unsteady flow sealing control method and its device |
| CN108036902A (en) * | 2017-12-17 | 2018-05-15 | 南京科技职业学院 | A set of new mechanical seal control device |
| CN109630685A (en) * | 2018-11-13 | 2019-04-16 | 扬州弘跃机械有限公司 | A kind of axial-flow pump double mechanical seal |
| CN110159764A (en) * | 2019-05-31 | 2019-08-23 | 清华大学 | Intelligent mechanical sealing system and its implementation |
| CN111396559A (en) * | 2020-03-27 | 2020-07-10 | 王亮 | Single-row magnetic mechanical seal |
| CN111412286A (en) * | 2020-03-27 | 2020-07-14 | 王亮 | Double-row magnetic mechanical seal |
| CN111981131A (en) * | 2019-09-25 | 2020-11-24 | 汤新红 | Anti-leakage mechanical seal with automatic stop protection |
| CN112096880A (en) * | 2020-09-11 | 2020-12-18 | 东台市光明机械密封有限公司 | Sealing gap control method of non-contact mechanical seal |
| CN113404866A (en) * | 2021-07-01 | 2021-09-17 | 西安热工研究院有限公司 | Electromagnetic auxiliary mechanical seal |
| CN114033671A (en) * | 2021-11-09 | 2022-02-11 | 中国人民解放***箭军工程大学 | Semi-contact type end face clearance compensation device and method for arc helical gear pump |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107882768A (en) * | 2017-10-27 | 2018-04-06 | 江苏大学 | A kind of unsteady flow sealing control method and its device |
| CN108036902A (en) * | 2017-12-17 | 2018-05-15 | 南京科技职业学院 | A set of new mechanical seal control device |
| CN109630685A (en) * | 2018-11-13 | 2019-04-16 | 扬州弘跃机械有限公司 | A kind of axial-flow pump double mechanical seal |
| CN110159764A (en) * | 2019-05-31 | 2019-08-23 | 清华大学 | Intelligent mechanical sealing system and its implementation |
| CN110159764B (en) * | 2019-05-31 | 2024-01-23 | 清华大学 | Intelligent mechanical sealing system and implementation method thereof |
| CN111981131A (en) * | 2019-09-25 | 2020-11-24 | 汤新红 | Anti-leakage mechanical seal with automatic stop protection |
| CN111981131B (en) * | 2019-09-25 | 2022-03-22 | 大庆市佰硕浩石油机械制造有限公司 | Anti-leakage mechanical seal with automatic stop protection |
| CN111412286A (en) * | 2020-03-27 | 2020-07-14 | 王亮 | Double-row magnetic mechanical seal |
| CN111396559B (en) * | 2020-03-27 | 2022-08-23 | 广州市昕恒泵业制造有限公司 | Single-row magnetic mechanical seal |
| CN111396559A (en) * | 2020-03-27 | 2020-07-10 | 王亮 | Single-row magnetic mechanical seal |
| CN112096880A (en) * | 2020-09-11 | 2020-12-18 | 东台市光明机械密封有限公司 | Sealing gap control method of non-contact mechanical seal |
| CN113404866A (en) * | 2021-07-01 | 2021-09-17 | 西安热工研究院有限公司 | Electromagnetic auxiliary mechanical seal |
| CN114033671A (en) * | 2021-11-09 | 2022-02-11 | 中国人民解放***箭军工程大学 | Semi-contact type end face clearance compensation device and method for arc helical gear pump |
| CN114033671B (en) * | 2021-11-09 | 2023-08-08 | 中国人民解放***箭军工程大学 | Semi-contact type end face gap compensation device and method for circular arc spiral gear pump |
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