CN104633128A - Device for improving magnetic liquid sealing pressure endurance capacity - Google Patents
Device for improving magnetic liquid sealing pressure endurance capacity Download PDFInfo
- Publication number
- CN104633128A CN104633128A CN201510044941.XA CN201510044941A CN104633128A CN 104633128 A CN104633128 A CN 104633128A CN 201510044941 A CN201510044941 A CN 201510044941A CN 104633128 A CN104633128 A CN 104633128A
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- Prior art keywords
- pressure
- pole shoe
- magnetic fluid
- fluid sealing
- hole
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Classifications
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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
- F16J15/40—Sealings between relatively-moving surfaces by means of fluid
- F16J15/406—Sealings between relatively-moving surfaces by means of fluid by at least one pump
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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
- F16J15/40—Sealings between relatively-moving surfaces by means of fluid
- F16J15/43—Sealings between relatively-moving surfaces by means of fluid kept in sealing position by magnetic force
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
The invention provides a device for improving magnetic liquid sealing pressure endurance capacity and belongs to the field of mechanical engineering sealing. The maximum pressure endurance value which can be borne by an existing magnetic liquid sealing device is greatly improved. The device comprises an outer shell (1), a left electric control valve (2), a gas storage tank (3), a left pole shoe (4), a permanent magnet (5), a differential pressure transducer (6), a right pole shoe (7), a right electric control valve (8), a high-pressure pump (9), a sealing component (10), a blocking ring (11), a right magnetism partitioning ring (12), a left magnetism partitioning ring (13) and the like. According to the magnetic liquid sealing device, the differential pressure of a pressure adjusting cavity I and a pressure adjusting cavity II is adjusted through a differential valve, and an effective scheme for sealing of inflammable, explosive and highly-corrosive gas under a high-pressure environment of an existing magnetic liquid sealing device is provided.
Description
Technical field
The invention belongs to sealing field of mechanical engineering.
Background technique
Magnetic fluid sealing technology due to its have zero leakage, without wearing and tearing, the life-span is long, advantages of simple structure and simple gradually use by increasing industry, zero leakage performance wherein especially other seal form is unapproachable.Existing magnetic liquid rotating sealing device typical structure is if publication number is for CN 102518811A and publication number are for as described in the patent application of CN 202091519U.Although the maximum voltage endurance capability of existing magnetic liquid rotating sealing device can reach 7MPa, but its axial length is more than 1m, and the monolateral gap of magnetic fluid sealing pole tooth and rotating shaft is usually at 0.1 ~ 0.3mm, when axial length is long, beating of rotating shaft is easy to cause magnetic fluid sealing pole tooth and rotating shaft to scratch, thus magnetic fluid sealing was lost efficacy.How to improve voltage endurance capability when not increasing axial length, be the difficult problem in magnetic fluid sealing field always, during especially inflammable, explosive at hyperbaric environment lower seal, highly corrosive gas, has higher requirement to its reliability.
Summary of the invention
The technical issues that need to address of the present invention are, existing magnetic fluid seal device can increase axial length while raising voltage endurance capability, reduce reliability, under making it to be applied in hyperbaric environment, especially cannot, highly corrosive gas inflammable, explosive at hyperbaric environment lower seal.Therefore a kind of device improving magnetic fluid sealing voltage endurance capability is provided.
The technical solution adopted for the present invention to solve the technical problems is:
Improve a device for magnetic fluid sealing voltage endurance capability, form this device and comprise:
Shell, left electric control valve, gas holder, left pole shoe, permanent magnet, differential pressure pickup, right pole shoe, right electric control valve, high-pressure service pump, black box, back-up ring, right magnetism resistent ring, left magnetism resistent ring;
Described left pole shoe, permanent magnet and right pole shoe form magnetic fluid sealing assembly, and magnetic fluid sealing assembly left chamber is pressure regulation chamber I, and right side and black box form pressure regulation chamber II; Described left electric control valve, differential pressure pickup and right electric control valve form differential valve, differential valve gas port a is fixedly connected with shell PATENT left side via a1, differential valve gas port b is fixedly connected with through hole b1 on the right side of shell, and differential valve gas port c is fixedly connected with high-pressure service pump, and differential valve gas port d is fixedly connected with gas holder; Back-up ring is fixedly connected with shell, and by left magnetism resistent ring, left pole shoe, permanent magnet, right pole shoe, right magnetism resistent ring and black box axially locating.Needing the pressurized gas by sealing to be cut off in pressure regulation chamber I by magnetic fluid sealing assembly, controlling the gas pressure intensity in pressure regulation chamber I by left electric control valve.When the gas pressure intensity in pressure regulation chamber I is excessive, if cheap or not there is inflammable, explosive, highly corrosive by sealing gas, by left electric control valve, it directly can be discharged, if expensive or there is inflammable, explosive, highly corrosive by sealing gas, can be entered in gas holder by left electric control valve and be sealed up for safekeeping, be ensure that zero leakage amount.By high-pressure service pump, ambient air or other gas are pumped in pressure regulation chamber II, controlled by right electric control valve to flow into the flow of air in the II of pressure regulating cavity room and the difference of the air mass flow of leaking from black box, the gas pressure in pressure regulation chamber II is tended towards stability.The pressure difference between pressure regulation chamber I and pressure regulation chamber II can be detected by differential pressure pickup, it is made to be less than the maximum pressure resistance of magnetic fluid sealing assembly, realize the transient equiliblium of sealing, reach when not increasing axial length, the maximum pressure resistance making voltage endurance capability be far longer than prior art to can bear, breaches the bottleneck of prior art voltage endurance capability.
Described shell is processed with through hole a1 in the left side of left pole shoe, on the right side of right pole shoe with on the left of black box, be processed with through hole b1.Described left magnetism resistent ring is processed with through hole a2, and this through hole is coaxial with the through hole a1 of shell, and described right magnetism resistent ring is processed with through hole b2, and this through hole is coaxial with the through hole b1 of shell.Through hole a1, b1 on shell are coaxial with through hole a2, b2 on magnetism resistent ring respectively, define air ventilation passage, make differential valve can pressure effectively in leak control and check pressure regulation chamber I and pressure regulation chamber II.
Described black box adopts the non-contact seals mode having certain leak-down rate, as modes such as labyrinth seal, mechanical seal or dry gas seals.Magnetic fluid seal device uniquely at present a kind ofly can reach the non-contact seals mode of zero leakage by sealing gas, and its shortcoming is that voltage endurance capability is little, although and labyrinth seal, mechanical seal or dry gas seals voltage endurance capability are high, but all can not accomplish zero leakage.By the non-contact seals mode of this high voltage endurance capability is serially connected in magnetic fluid sealing assembly rear end, utilize its voltage endurance capability high, the advantage that reliability is high, make in conjunction with high-pressure service pump and differential valve the High Air Ambient Pressure that in pressure regulation chamber II, formation one is stable.
The pressure reduction control range of the differential valve that described left electric control valve, differential pressure pickup and right electric control valve are formed is less than the maximum pressure resistance of the magnetic fluid sealing assembly formed by left pole shoe, permanent magnet and right pole shoe.By the magnetic fluid seal device after improving, its voltage endurance capability has had very big raising, although also can resistance to low pressure, more application be in the occasion of pressure more than 3MPa.At such high pressures, once the pressure in pressure regulation chamber I or II is because of outside cause generation larger fluctuation, cause the magnetic liquid in magnetic fluid sealing assembly to be broken through, this device is by total failure, even if the pressure readjusting pressure regulation chamber I or II also cannot continue to use.Therefore, for avoiding producing above-mentioned situation, the maximum pressure resistance of magnetic fluid sealing assembly should be made should to be greater than pressure reduction control range at least more than the 1MPa of differential valve, the impact of pressure surge is born by differential valve completely.
Described pressure regulation chamber I is connected with by the chamber of sealing gas, pressure regulation chamber II is connected with external environment by black box, the gas be filled with is the inertia such as air, carbon dioxide or cheap gas, the pressure of pressure regulation chamber I is greater than the pressure of pressure regulation chamber II, and its pressure difference is less than the maximum pressure resistance of magnetic fluid sealing assembly.When the pressure of pressure regulation chamber I is at more than 3MPa, for guaranteeing safe handling, the difference between pressure regulation chamber I and II at least should be less than maximum more than the pressure resistance 1MPa of magnetic fluid sealing assembly.
The present invention compares had beneficial effect with prior art: (1) this device can when not increasing axial length, the maximum pressure resistance making magnetic fluid seal device voltage endurance capability be far longer than prior art to can bear, breaches the bottleneck of prior art voltage endurance capability; (2) left electric control valve and gas holder are effectively when the pressure of pressure regulation chamber I is excessive, gas that is expensive or inflammable, explosive, highly corrosive are discharged in time and are stored, has both avoided the injury caused personnel equipment, again saved cost; (3) air or other gas effectively can be filled with in pressure regulation chamber II and form stable high pressure by black box, right electric control valve and high-pressure service pump, make the pressure reduction of magnetic fluid sealing two side cavity reach tolerance zone.
Accompanying drawing explanation
A kind of device improving magnetic fluid sealing voltage endurance capability of Fig. 1.
In Fig. 1: shell 1, left electric control valve 2, gas holder 3, left pole shoe 4, permanent magnet 5, differential pressure pickup 6, right pole shoe 7, right electric control valve 8, high-pressure service pump 9, black box 10, back-up ring 11, right magnetism resistent ring 12, left magnetism resistent ring 13.
Embodiment
Be that the invention will be further described for embodiment with accompanying drawing:
A kind of device improving magnetic fluid sealing voltage endurance capability, as Fig. 1, sealing device comprises: shell 1, left electric control valve 2, gas holder 3, left pole shoe 4, permanent magnet 5, differential pressure pickup 6, right pole shoe 7, right electric control valve 8, high-pressure service pump 9, black box 10, back-up ring 11, right magnetism resistent ring 12, left magnetism resistent ring 13.
Connection between each several part forming this device:
First left magnetism resistent ring 13 is arranged on the right side of shell 1 endoporus, and guarantees that the through hole a2 of left magnetism resistent ring 13 is coaxial with the through hole a1 on the left of shell 1; Then left pole shoe 4 is arranged on the right side of left magnetism resistent ring 13, continues and permanent magnet 5 is arranged on the right side of left pole shoe 4, the right side right pole shoe 7 being arranged on permanent magnet 5 of continuing forms magnetic fluid sealing assembly; Continue and the right side is arranged on the right side of right pole shoe 7 every magnetic 12 ring, and guarantee that the through hole b2 of right magnetism resistent ring 12 is coaxial with the through hole b1 on the right side of shell 1; Again black box 10 is arranged on the right side of right magnetism resistent ring 12, with being fixedly connected with of shell 1, the part axial in shell 1 is located by back-up ring 11.The differential valve that differential pressure pickup 6, left electrically-controlled valve 2 are formed with right electrically-controlled valve 8 is fixedly connected with shell 1, wherein differential valve gas port a is coaxial with the through hole a1 on the left of shell 1, differential valve gas port b is coaxial with the through hole b1 on the right side of shell 1, differential valve gas port d is connected with gas holder 3, and differential valve gas port c is connected with high-pressure service pump 9.
Operationally, first slowly be filled with by sealing gas in pressure regulation chamber I, after the pressure reduction of pressure regulation chamber I and pressure regulation chamber II reaches selected control range, pump is opened, pressure regulation gas (air or carbon dioxide etc.) is filled with in pressure regulation chamber II, guarantee that the pressure reduction of pressure regulation chamber I and pressure regulation chamber II remains in control range by the power slowly increasing pump, until after the gas pressure intensity in pressure regulation chamber I reaches required value, keep the power stability of pump, regulate and control the pressure reduction in pressure regulation chamber I and pressure regulation chamber II finally by differential valve.
Left and right magnetism resistent ring, shell 1 all select non-magnetic material.
Magnetic conductive substance selected by left and right pole shoe.
Claims (6)
1. improve a device for magnetic fluid sealing voltage endurance capability, it is characterized in that: comprise shell (1), left electric control valve (2), gas holder (3), left pole shoe (4), permanent magnet (5), differential pressure pickup (6), right pole shoe (7), right electric control valve (8), high-pressure service pump (9), black box (10), back-up ring (11), right magnetism resistent ring (12), left magnetism resistent ring (13); Described left pole shoe (4), permanent magnet (5) and right pole shoe (7) form magnetic fluid sealing assembly, magnetic fluid sealing assembly left chamber is pressure regulation chamber I, and right side and black box (10) form pressure regulation chamber II; Described left electric control valve (2), differential pressure pickup (6) and right electric control valve (8) form differential valve, differential valve gas port a is fixedly connected with shell PATENT left side via a1, differential valve gas port b is fixedly connected with through hole b1 on the right side of shell, differential valve gas port c is fixedly connected with high-pressure service pump (9), and differential valve gas port d is fixedly connected with gas holder (3); Back-up ring (11) is fixedly connected with shell (1), and by left magnetism resistent ring (13), left pole shoe (4), permanent magnet (5), right pole shoe (7), right magnetism resistent ring (12) and black box (10) axially locating.
2. a kind of device improving magnetic fluid sealing voltage endurance capability according to claim 1, is characterized in that:
Described shell (1) is processed with through hole a1 in the left side of left pole shoe, is processed with through hole b1 on right pole shoe (7) right side and black box (10) left side.
3. a kind of device improving magnetic fluid sealing voltage endurance capability according to claim 1 and 2, is characterized in that:
Described left magnetism resistent ring (13) is processed with through hole a2, and this through hole is coaxial with the through hole a1 of shell (1), and described right magnetism resistent ring (12) is processed with through hole b2, and this through hole is coaxial with the through hole b1 of shell (1).
4. a kind of device improving magnetic fluid sealing voltage endurance capability according to claim 1, is characterized in that:
Described black box (10) adopts the non-contact seals mode having certain leak-down rate, as modes such as labyrinth seal, mechanical seal or dry gas seals.
5. a kind of device improving magnetic fluid sealing voltage endurance capability according to claim 1, is characterized in that:
The pressure reduction control range of the differential valve that described left electric control valve (2), differential pressure pickup (6) and right electric control valve (8) are formed is less than the maximum pressure resistance of the magnetic fluid sealing assembly formed by left pole shoe (4), permanent magnet (5) and right pole shoe (7).
6. a kind of device improving magnetic fluid sealing voltage endurance capability according to claim 1 or 5, is characterized in that:
Described pressure regulation chamber I is connected with by sealing gas chamber, pressure regulation chamber II is connected with external environment by black box (10), the gas be filled with is the inertia such as air, carbon dioxide or cheap gas, the pressure of pressure regulation chamber I is greater than the pressure of pressure regulation chamber II, and its pressure difference is less than the maximum pressure resistance of magnetic fluid sealing assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510044941.XA CN104633128B (en) | 2015-01-29 | 2015-01-29 | A kind of device improving magnetic fluid sealing voltage endurance capability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510044941.XA CN104633128B (en) | 2015-01-29 | 2015-01-29 | A kind of device improving magnetic fluid sealing voltage endurance capability |
Publications (2)
| Publication Number | Publication Date |
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| CN104633128A true CN104633128A (en) | 2015-05-20 |
| CN104633128B CN104633128B (en) | 2016-12-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510044941.XA Expired - Fee Related CN104633128B (en) | 2015-01-29 | 2015-01-29 | A kind of device improving magnetic fluid sealing voltage endurance capability |
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| CN (1) | CN104633128B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104989830A (en) * | 2015-06-16 | 2015-10-21 | 北京交通大学 | Multistage magnetic liquid sealing device for sealing liquid |
| CN106090237A (en) * | 2016-08-15 | 2016-11-09 | 广西科技大学 | A kind of buffer-type device for sealing magnetic fluid |
| CN108397550A (en) * | 2018-02-11 | 2018-08-14 | 广西科技大学 | A kind of magnetic fluid sealing structure |
| CN108692032A (en) * | 2018-06-26 | 2018-10-23 | 清华大学 | A kind of magnetic fluid seal device of Multilevel partial-pressure |
| CN110529601A (en) * | 2019-09-12 | 2019-12-03 | 马江杰 | Combination packaging type dynamic sealing based on magnetic fluid |
| CN112112971A (en) * | 2020-10-30 | 2020-12-22 | 清华大学 | Floating ring type magnetic liquid sealing device |
Citations (5)
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| JPH03213692A (en) * | 1990-01-17 | 1991-09-19 | Chiyoudendou Hatsuden Kanren Kiki Zairyo Gijutsu Kenkyu Kumiai | Shaft seal device for oilless screw compressor |
| JPH04341665A (en) * | 1991-05-20 | 1992-11-27 | Nippon Seiko Kk | Multistage magnetic fluid sealing device for vacuum space |
| JPH1019138A (en) * | 1996-07-04 | 1998-01-23 | Rigaku Corp | Magnetic sealing device with exhaust chamber |
| CN202091519U (en) * | 2011-05-20 | 2011-12-28 | 北京交通大学 | Magnetic liquid rotating sealing device |
| CN102518811A (en) * | 2011-12-15 | 2012-06-27 | 北京交通大学 | Magnetic fluid sealing structure |
-
2015
- 2015-01-29 CN CN201510044941.XA patent/CN104633128B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03213692A (en) * | 1990-01-17 | 1991-09-19 | Chiyoudendou Hatsuden Kanren Kiki Zairyo Gijutsu Kenkyu Kumiai | Shaft seal device for oilless screw compressor |
| JPH04341665A (en) * | 1991-05-20 | 1992-11-27 | Nippon Seiko Kk | Multistage magnetic fluid sealing device for vacuum space |
| JPH1019138A (en) * | 1996-07-04 | 1998-01-23 | Rigaku Corp | Magnetic sealing device with exhaust chamber |
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| CN102518811A (en) * | 2011-12-15 | 2012-06-27 | 北京交通大学 | Magnetic fluid sealing structure |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104989830B (en) * | 2015-06-16 | 2017-05-17 | 北京交通大学 | Multistage magnetic liquid sealing device for sealing liquid |
| CN104989830A (en) * | 2015-06-16 | 2015-10-21 | 北京交通大学 | Multistage magnetic liquid sealing device for sealing liquid |
| CN106090237A (en) * | 2016-08-15 | 2016-11-09 | 广西科技大学 | A kind of buffer-type device for sealing magnetic fluid |
| CN106090237B (en) * | 2016-08-15 | 2018-03-27 | 广西科技大学 | A kind of buffer-type device for sealing magnetic fluid |
| CN108397550A (en) * | 2018-02-11 | 2018-08-14 | 广西科技大学 | A kind of magnetic fluid sealing structure |
| CN108692032B (en) * | 2018-06-26 | 2020-07-28 | 清华大学 | Magnetic fluid sealing device with multi-stage partial pressure |
| CN108692032A (en) * | 2018-06-26 | 2018-10-23 | 清华大学 | A kind of magnetic fluid seal device of Multilevel partial-pressure |
| CN110529601A (en) * | 2019-09-12 | 2019-12-03 | 马江杰 | Combination packaging type dynamic sealing based on magnetic fluid |
| CN110529601B (en) * | 2019-09-12 | 2020-09-11 | 乐清市钜派企业管理咨询有限公司 | Combined cartridge type dynamic seal based on magnetic fluid |
| CN111963684A (en) * | 2019-09-12 | 2020-11-20 | 杨春花 | Combined cartridge type dynamic seal based on magnetic fluid |
| CN111963685A (en) * | 2019-09-12 | 2020-11-20 | 杨春花 | Combined cartridge type dynamic seal based on magnetic fluid |
| CN111963684B (en) * | 2019-09-12 | 2022-04-19 | 江苏锡安达防爆股份有限公司 | Combined cartridge type dynamic seal based on magnetic fluid |
| CN111963685B (en) * | 2019-09-12 | 2022-05-06 | 格尔减速机(南通)有限公司 | Combined cartridge type dynamic seal based on magnetic fluid |
| CN112112971A (en) * | 2020-10-30 | 2020-12-22 | 清华大学 | Floating ring type magnetic liquid sealing device |
| CN112112971B (en) * | 2020-10-30 | 2022-02-11 | 清华大学 | Floating ring type magnetic liquid sealing device |
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| Publication number | Publication date |
|---|---|
| CN104633128B (en) | 2016-12-07 |
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