CN113357373A - Pole shoe integrated magnetic liquid sealing device with cooling function - Google Patents
Pole shoe integrated magnetic liquid sealing device with cooling function Download PDFInfo
- Publication number
- CN113357373A CN113357373A CN202110793530.6A CN202110793530A CN113357373A CN 113357373 A CN113357373 A CN 113357373A CN 202110793530 A CN202110793530 A CN 202110793530A CN 113357373 A CN113357373 A CN 113357373A
- Authority
- CN
- China
- Prior art keywords
- ring
- pole shoe
- integrated
- shell
- pole
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
-
- 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
- F16J15/162—Special parts or details relating to lubrication or cooling of the sealing itself
-
- 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
- F16J15/44—Free-space packings
- F16J15/447—Labyrinth packings
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
Pole shoe integrated magnetic liquid sealing device with cooling function belongs to mechanical engineering sealing field. The problem that the magnetic liquid is easy to lose efficacy when the existing magnetic liquid is sealed under high-speed and high-temperature working conditions is solved. A water-insulating ring is additionally arranged between the two pole shoes, the water-insulating ring and the two pole shoes are processed into a part, and a cooling liquid inlet and outlet pipeline is processed at the position, corresponding to the permanent magnet, of the shell.
Description
Technical Field
The invention belongs to the field of mechanical engineering sealing, and particularly relates to a pole shoe integrated magnetic liquid sealing device with a cooling function.
Background
The magnetic liquid seal is a novel sealing mode and has the advantages of zero leakage, no pollution, long service life and the like. However, under high temperature conditions, the evaporation rate of the magnetic liquid is increased, and the magnetic performance is weakened, so that the service life of the magnetic liquid seal is shortened, and the pressure resistance is reduced. When the rotating speed of the rotating shaft is high, friction between the magnetic liquid and the rotating shaft and viscous friction existing inside the rotating shaft are increased, so that the temperature is too high, and the pressure resistance value is reduced. Therefore, to increase the withstand voltage of the magnetic liquid seal, the operating temperature around the magnetic liquid needs to be lowered. The invention aims to design a magnetic liquid sealing device with a cooling function, which ensures that the magnetic liquid is sealed, the working temperature around the magnetic liquid is reduced by introducing circulating cooling liquid, and the pressure resistance value is improved.
The existing magnetic liquid sealing structure with the cooling function mainly comprises: CN103574041A, CN106402401B, CN104197024A, CN204828678U, CN104455463A, CN204852353U, CN106969150A, etc. provide a magnetic liquid sealing structure with cooling function. Wherein, the patent CN103574041A sets a peristaltic pump under each pole tooth for external circulation, and directly pumps the magnetic liquid to the outside for cooling; the outer diameters of two pole shoes of patent CN106402401B are processed into a concave shape, and magnetic liquid is cooled by introducing cooling liquid into each pole shoe; according to the patent CN104197024A, on the basis of the patent CN204828678U, a plurality of layers of heat dissipation webs are added to the grooves in the outer diameter of the pole shoe, so that the heat dissipation effect is improved; in patent CN104455463A, a heat conducting sheet is adhered to each tooth groove, an annular water tank is processed, and a cooling liquid is introduced to cool the magnetic liquid; the magnetic liquid of patent CN204852353U is located between a pole shoe and a shaft sleeve, and the magnetic liquid is cooled in a mode of installing a finned tube between a permanent magnet and the shaft sleeve and introducing a refrigerant into the finned tube; patent CN106969150A adopts a back groove opened on the outer diameter of the pole shoe for flowing cooling liquid. And the back teeth are arranged alternately, so that the contact area of the cooling liquid and the pole shoe is increased, and the influence on a magnetic circuit is reduced. The structure of the invention is different in that the structure of the pole shoes is not changed, the influence on the magnetic circuit in the pole shoes is smaller, the gap between the middle of the two pole shoes and the permanent magnet is used as a cooling liquid channel, the water isolating ring and the left and right pole shoes are processed into an integral part, and the outer diameter of the pole shoes is added with the sealing ring groove to prevent the cooling liquid from leaking, so that the structure is simpler, the processing is easy, and the cost is low.
Disclosure of Invention
The invention aims to solve the technical problems that the existing magnetic liquid sealing device is easy to lose efficacy of magnetic liquid under the working conditions of high rotating speed and high temperature, the change of the pole shoe structure can influence a magnetic loop to reduce the withstand voltage value, the process is more complex, and the cost is higher. Therefore, a pole piece integrated magnetic liquid sealing device with a cooling function is provided.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the magnetic liquid seal and labyrinth seal combined sealing device comprises: the magnetic bearing comprises a side sealing ring 1, a left bearing 2, a left magnetism isolating ring 3, a left sealing ring 4, a shell 5, a permanent magnet 6, a right sealing ring 7, a right magnetism isolating ring 8, a threaded end cover 9, a right shaft retainer ring 10, a right bearing 11, magnetic liquid 12, an integrated pole shoe 13, a rotating shaft 14 and a left shaft retainer ring 15.
Connections between the parts making up the device: the side sealing ring 1 is embedded in a groove on the left end face of the shell 5; the retainer ring 15 for the left shaft is embedded in a groove on the left side of the rotating shaft 14; the inner ring of the left shaft 2 is connected with the rotating shaft 14, the outer ring of the left shaft is connected with the shell 5, and the left end face of the left shaft is in contact with the right end face of the retainer ring 15 for the left shaft; the left magnetism isolating ring 3 is connected with the shell 5, and the left end face of the left magnetism isolating ring is in contact with the right end face of the left bearing 2; the left sealing ring 4 is embedded in a groove of the left pole shoe of the integrated pole shoe 13; the right sealing ring 7 is embedded in a groove of the right pole shoe of the integrated pole shoe 13; the permanent magnet 6 is connected with the integrated pole shoe 13; the integrated pole shoe 13 is connected with the shell 5, and the left end surface of the integrated pole shoe is in contact with the right end surface of the left magnetism isolating ring 3; the magnetic liquid 12 is injected into a sealing gap between a pole tooth part of the integrated pole shoe 13 and the rotating shaft 14; the right magnetism isolating ring 8 is connected with the shell 5, and the left end face of the right magnetism isolating ring is in contact with the right end face of the integrated pole shoe 13; the inner ring of the right bearing 11 is connected with the rotating shaft 14, the outer ring of the right bearing is connected with the shell 5, and the left end surface of the right bearing is contacted with the right end surface of the right magnetism isolating ring 8; the retainer ring 10 for the right shaft is embedded in a groove on the right side of the rotating shaft 14, and the left end face of the retainer ring is in contact with the right end face of the right bearing 11; the threaded end cap 9 is in threaded connection with the housing 5.
The left pole shoe and the right pole shoe in the integrated pole shoes 13 form a whole through the water-stop ring additionally arranged in the middle, the water-stop ring in the middle and the left and right pole shoes are integrated parts, the thickness of the water-stop ring is calculated to enable most of magnetic force lines to pass through the pole tooth part, the position of the water-stop ring is close to the inner diameter position of the pole shoes, and in order to enable a larger space to exist between the two pole shoes and enable cooling liquid to flow in the water-stop ring, the cooling effect is improved.
The shell 5 is provided with a pipeline which is capable of being filled with cooling liquid and corresponds to the permanent magnet 6, namely, a position between the left pole shoe and the right pole shoe of the integrated pole shoe 13, a pipeline is arranged on the upper surface of the shell and serves as an inflow port, and a pipeline is arranged on the lower surface of the shell and serves as an outflow port, namely, a position where the inlet rotates 180 degrees.
The outer diameters of the left and right pole shoes of the integrated pole shoe 13 are provided with grooves for placing sealing rings, so that the cooling liquid is prevented from leaking between the integrated pole shoe 13 and the shell 5 after entering from an inlet pipeline of the shell 5.
The integrated pole shoe 13 and the rotating shaft 14 are made of magnetic conductive materials, and the permanent magnet 6 is added to form a magnetic loop; magnetic liquid 12 is injected between the inner diameter of the pole teeth of the pole shoes and the rotating shaft 14; the housing 5 is of a non-magnetically conductive material.
The invention has the beneficial effects that: 1. the structure that the water-isolating ring and the two pole shoes are processed into a whole is added on the traditional magnetic liquid sealing structure, so that the function of cooling the two pole shoes is provided, the magnetic liquid can keep a lower temperature in the working process, and the maximum pressure-resistant rotating speed and the working temperature of the magnetic liquid seal can be improved; 2. the gap between the permanent magnet 6 and the left and right pole shoes of the integrated pole shoe 13 is used as a cooling liquid channel, so that the increase of the axial size caused by the increase of a cooling water jacket is avoided; 3. the structure of the pole shoe is not changed, so that a magnetic circuit is not changed, and the sealing pressure resistance value of the magnetic liquid is not reduced; 4. the water isolating ring and the left and right pole shoes are processed into an integral part, so that the leakage of cooling liquid between the pole shoes and the water isolating ring can be avoided; 5. compared with the traditional magnetic liquid sealing structure, the whole structure has the advantages of small change, simple structure and easy realization.
Drawings
Fig. 1 is a pole piece integrated magnetic liquid sealing device with a cooling function;
in fig. 1, a side seal ring 1, a left bearing 2, a left magnetic isolation ring 3, a left seal ring 4, a shell 5, a permanent magnet 6, a right seal ring 7, a right magnetic isolation ring 8, a threaded end cover 9, a right shaft retainer ring 10, a right bearing 11, magnetic liquid 12, an integrated pole shoe 13, a rotating shaft 14 and a left shaft retainer ring 15;
fig. 2 shows a permanent magnet 6, an integrated pole shoe 13.
Detailed Description
The invention is further illustrated by the following detailed description:
the magnetic liquid seal and labyrinth seal combined sealing device comprises: the magnetic bearing comprises a side sealing ring 1, a left bearing 2, a left magnetism isolating ring 3, a left sealing ring 4, a shell 5, a permanent magnet 6, a right sealing ring 7, a right magnetism isolating ring 8, a threaded end cover 9, a right shaft retainer ring 10, a right bearing 11, magnetic liquid 12, an integrated pole shoe 13, a rotating shaft 14 and a left shaft retainer ring 15.
Connections between the parts making up the device: the side sealing ring 1 is embedded in a groove on the left end face of the shell 5; the retainer ring 15 for the left shaft is embedded in a groove on the left side of the rotating shaft 14; the inner ring of the left shaft 2 is connected with the rotating shaft 14, the outer ring of the left shaft is connected with the shell 5, and the left end face of the left shaft is in contact with the right end face of the retainer ring 15 for the left shaft; the left magnetism isolating ring 3 is connected with the shell 5, and the left end face of the left magnetism isolating ring is in contact with the right end face of the left bearing 2; the left sealing ring 4 is embedded in a groove of the left pole shoe of the integrated pole shoe 13; the right sealing ring 7 is embedded in a groove of the right pole shoe of the integrated pole shoe 13; the permanent magnet 6 is connected with the integrated pole shoe 13; the integrated pole shoe 13 is connected with the shell 5, and the left end surface of the integrated pole shoe is in contact with the right end surface of the left magnetism isolating ring 3; the magnetic liquid 12 is injected into a sealing gap between a pole tooth part of the integrated pole shoe 13 and the rotating shaft 14; the right magnetism isolating ring 8 is connected with the shell 5, and the left end face of the right magnetism isolating ring is in contact with the right end face of the integrated pole shoe 13; the inner ring of the right bearing 11 is connected with the rotating shaft 14, the outer ring of the right bearing is connected with the shell 5, and the left end surface of the right bearing is contacted with the right end surface of the right magnetism isolating ring 8; the retainer ring 10 for the right shaft is embedded in a groove on the right side of the rotating shaft 14, and the left end face of the retainer ring is in contact with the right end face of the right bearing 11; the threaded end cap 9 is in threaded connection with the housing 5.
The water-resisting ring in the integrated pole shoe 13 and the pole shoe are made of the same magnetic conducting materials, and the thickness of the magnetism isolating ring is small, so that the difference between the magnetic flux density of the pole teeth and the magnetic flux density of the pole teeth without the water-resisting ring is not large after the magnetic flux density of the magnetism isolating ring is saturated.
The integrated pole shoe 13 and the rotating shaft 14 are made of magnetic conductive materials, the permanent magnet 6 is added to form a magnetic loop, and the magnetic liquid 12 is injected between the pole tooth part of the pole shoe and the rotating shaft 14;
the shell 5 is made of non-magnetic conductive material, such as stainless steel 304;
the pole shoe and the rotating shaft are made of 2Cr13 with good magnetic conductivity;
the permanent magnet material is neodymium iron boron;
the type of magnetic liquid 12 is selected from magnetic liquids of different base carrier liquids according to the use environment and different sealing media.
Claims (5)
1. Pole shoe integral type magnetic fluid sealing device with cooling function, its characterized in that: the device comprises a side sealing ring (1), a left bearing (2), a left magnetic isolation ring (3), a left sealing ring (4), a shell (5), a permanent magnet (6), a right sealing ring (7), a right magnetic isolation ring (8), a threaded end cover (9), a right shaft check ring (10), a right bearing (11), magnetic liquid (12), an integrated pole shoe (13), a rotating shaft (14) and a left shaft check ring (15);
connections between the parts making up the device: the side sealing ring (1) is embedded in a groove on the left end face of the shell (5); the retainer ring (15) for the left shaft is embedded in a groove on the left side of the rotating shaft (14); the inner ring of the left bearing (2) is connected with the rotating shaft (14), the outer ring of the left bearing is connected with the shell (5), and the left end face of the left bearing is in contact with the right end face of the retainer ring (15) for the left shaft; the left magnetism isolating ring (3) is connected with the shell (5), and the left end face of the left magnetism isolating ring is in contact with the right end face of the left bearing (2); the left sealing ring (4) is embedded in a groove of the left pole shoe of the integrated pole shoe (13); the right sealing ring (7) is embedded in a groove of the right pole shoe of the integrated pole shoe (13); the permanent magnet (6) is connected with the integrated pole shoe (13); the integrated pole shoe (13) is connected with the shell (5), and the left end surface of the integrated pole shoe is in contact with the right end surface of the left magnetism isolating ring (3); the magnetic liquid (12) is injected into a sealing gap between a pole tooth part of the integrated pole shoe (13) and the rotating shaft (14); the right magnetism isolating ring (8) is connected with the shell (5), and the left end face of the right magnetism isolating ring is in contact with the right end face of the integrated pole shoe (13); the inner ring of the right bearing (11) is connected with the rotating shaft (14), the outer ring of the right bearing is connected with the shell (5), and the left end face of the right bearing is in contact with the right end face of the right magnetism isolating ring (8); the retainer ring (10) for the right shaft is embedded in a groove on the right side of the rotating shaft (14), and the left end face of the retainer ring is in contact with the right end face of the right bearing (11); the threaded end cover (9) is in threaded connection with the shell (5).
2. A pole piece integrated magnetic liquid sealing device with a cooling function as claimed in claim 1, wherein: the left pole shoe and the right pole shoe in the integrated pole shoe (13) form a whole through the water-stop ring additionally arranged in the middle, the water-stop ring in the middle and the left and right pole shoes are integrated parts, the thickness of the water-stop ring is calculated to enable most of magnetic lines of force to pass through the pole tooth part, the position of the water-stop ring is close to the inner diameter of the pole shoe, and in order to enable a larger space to exist between the two pole shoes and enable cooling liquid to flow in the water-stop ring, the cooling effect is improved.
3. A pole piece integrated magnetic liquid sealing device with a cooling function as claimed in claim 1, wherein: the shell (5) is provided with a pipeline which is capable of being filled with cooling liquid and corresponds to the permanent magnet (6), namely, a position between the left pole shoe and the right pole shoe of the integrated pole shoe (13), a pipeline is arranged on the upper surface of the shell and serves as an inflow port, and a pipeline is arranged on the lower surface of the shell and serves as an outflow port, namely, the position where the inlet rotates 180 degrees.
4. A pole piece integrated magnetic liquid sealing device with a cooling function as claimed in claim 1, wherein: the outer diameters of the left and right pole shoes of the integrated pole shoe (13) are provided with grooves for placing sealing rings, so that the cooling liquid is prevented from leaking between the integrated pole shoe (13) and the shell (5) after entering from an inlet pipeline of the shell (5).
5. A pole piece integrated magnetic liquid sealing device with a cooling function as claimed in claim 1, wherein: a certain distance exists between the permanent magnet (6) and an inlet pipeline of the shell (5), so that a larger space exists between the two pole shoes of the integrated pole shoe (13) for the cooling liquid to flow in the integrated pole shoe, and the cooling effect is improved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110793530.6A CN113357373A (en) | 2021-07-14 | 2021-07-14 | Pole shoe integrated magnetic liquid sealing device with cooling function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110793530.6A CN113357373A (en) | 2021-07-14 | 2021-07-14 | Pole shoe integrated magnetic liquid sealing device with cooling function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113357373A true CN113357373A (en) | 2021-09-07 |
Family
ID=77539336
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110793530.6A Pending CN113357373A (en) | 2021-07-14 | 2021-07-14 | Pole shoe integrated magnetic liquid sealing device with cooling function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113357373A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114370508A (en) * | 2021-12-23 | 2022-04-19 | 清华大学 | Magnetic liquid sealing device with cooling system |
| CN114483638A (en) * | 2022-02-28 | 2022-05-13 | 浙江省机电设计研究院有限公司 | Magnetic liquid sealing device for centrifugal pump |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0854068A (en) * | 1994-08-10 | 1996-02-27 | Chodendo Hatsuden Kanren Kiki Zairyo Gijutsu Kenkyu Kumiai | Magnetic fluid seal |
| CN106402388A (en) * | 2016-10-25 | 2017-02-15 | 北京交通大学 | Copper-ring water-cooling type magnetic liquid sealing device |
| CN106461089A (en) * | 2014-05-13 | 2017-02-22 | 日本伊格尔博格曼有限公司 | Method for assembling ferrofluid seal, and ferrofluid seal |
| CN106969150A (en) * | 2017-03-31 | 2017-07-21 | 北京交通大学 | Pole shoe back-trough formula circulating cooling magnetic fluid seal device |
| CN206468816U (en) * | 2016-12-28 | 2017-09-05 | 自贡兆强环保科技股份有限公司 | A kind of high-speed centrifugal compressor magnetic fluid seal device |
| CN206830817U (en) * | 2017-05-09 | 2018-01-02 | 北京交通大学 | Pole shoe interconnection formula circulating cooling magnetic fluid seal device |
| CN112648380A (en) * | 2020-12-30 | 2021-04-13 | 清华大学 | Magnetic liquid sealing device |
-
2021
- 2021-07-14 CN CN202110793530.6A patent/CN113357373A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0854068A (en) * | 1994-08-10 | 1996-02-27 | Chodendo Hatsuden Kanren Kiki Zairyo Gijutsu Kenkyu Kumiai | Magnetic fluid seal |
| CN106461089A (en) * | 2014-05-13 | 2017-02-22 | 日本伊格尔博格曼有限公司 | Method for assembling ferrofluid seal, and ferrofluid seal |
| CN106402388A (en) * | 2016-10-25 | 2017-02-15 | 北京交通大学 | Copper-ring water-cooling type magnetic liquid sealing device |
| CN206468816U (en) * | 2016-12-28 | 2017-09-05 | 自贡兆强环保科技股份有限公司 | A kind of high-speed centrifugal compressor magnetic fluid seal device |
| CN106969150A (en) * | 2017-03-31 | 2017-07-21 | 北京交通大学 | Pole shoe back-trough formula circulating cooling magnetic fluid seal device |
| CN206830817U (en) * | 2017-05-09 | 2018-01-02 | 北京交通大学 | Pole shoe interconnection formula circulating cooling magnetic fluid seal device |
| CN112648380A (en) * | 2020-12-30 | 2021-04-13 | 清华大学 | Magnetic liquid sealing device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114370508A (en) * | 2021-12-23 | 2022-04-19 | 清华大学 | Magnetic liquid sealing device with cooling system |
| CN114370508B (en) * | 2021-12-23 | 2023-02-21 | 清华大学 | Magnetic liquid sealing device with cooling system |
| CN114483638A (en) * | 2022-02-28 | 2022-05-13 | 浙江省机电设计研究院有限公司 | Magnetic liquid sealing device for centrifugal pump |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113357373A (en) | Pole shoe integrated magnetic liquid sealing device with cooling function | |
| US10495093B2 (en) | Micro hydraulic suspension mechanical pump | |
| CN204828678U (en) | Magnetic fluid sealing device of multilayer heat dissipation web cooling slot type | |
| WO2020150966A1 (en) | Magnetic-liquid sealing device with heat conduction rods and heat dissipation sleeve | |
| CN206830817U (en) | Pole shoe interconnection formula circulating cooling magnetic fluid seal device | |
| CN104455463B (en) | Embed the cooling liquid formula magnetic fluid seal device of heat-conducting plate | |
| CN104165230B (en) | Ventilation type air cooling magnetic liquid sealing device | |
| CN111577649A (en) | Magnetic fluid sealing device for slurry pump | |
| CN104197024A (en) | Peristaltic pumping circulation cooling type magnetic liquid sealing device | |
| CN106969150A (en) | Pole shoe back-trough formula circulating cooling magnetic fluid seal device | |
| CN204852353U (en) | Finned tube cooled magnetic fluid sealing device | |
| CN207777625U (en) | Deep trouth water-cooled magnetic fluid seal device | |
| CN204852354U (en) | New installation of sealed heat transfer of reinforcing magnetic fluid | |
| CN112253757A (en) | Double-source multi-tooth magnetic liquid sealing device | |
| CN106122037B (en) | A kind of cooling device of high-temperature pump suspension body | |
| CN102170189A (en) | Floating sealing ring bearing chamber of motor | |
| CN207920888U (en) | A kind of magnetic drive pump | |
| CN206860882U (en) | A kind of buffer fluid flow path device structure of mechanical seal | |
| CN212616303U (en) | Mechanical sealing structure | |
| CN214008075U (en) | Magnetic liquid sealing cooling device | |
| CN113958608A (en) | Magnetic fluid bearing | |
| CN110985404B (en) | Magnetic suspension fluid micropump with straight-through inner flow channel | |
| CN207584029U (en) | A kind of alternating expression device for sealing magnetic fluid | |
| CN113357370A (en) | Magnetic liquid sealing device capable of adjusting number of pole teeth | |
| CN116642015A (en) | Magnetic liquid sealing device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210907 |