CN209041569U - A kind of cryogenic pump combination sealing arrangement - Google Patents
A kind of cryogenic pump combination sealing arrangement Download PDFInfo
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- CN209041569U CN209041569U CN201821481547.8U CN201821481547U CN209041569U CN 209041569 U CN209041569 U CN 209041569U CN 201821481547 U CN201821481547 U CN 201821481547U CN 209041569 U CN209041569 U CN 209041569U
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- 238000007789 sealing Methods 0.000 title claims abstract description 117
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- 210000004907 gland Anatomy 0.000 claims description 14
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 13
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- 230000000694 effects Effects 0.000 description 9
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- 238000005086 pumping Methods 0.000 description 6
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- 229920001343 polytetrafluoroethylene Polymers 0.000 description 4
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
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Landscapes
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The utility model proposes cryogenic pump combination sealing arrangement, including rotary shaft；The outside of rotary shaft is arranged in labyrinth seal, and one end of which is fixed on base；Magnetic fluid seal, is axially fixed in the other end of labyrinth seal, and the outside of rotary shaft is arranged in；Spring energy-storage sealing ring is installed on rotary shaft outside and the annular space between labyrinth seal and rotary shaft, is used for radial seal；Resistance envelope gas import, is opened on labyrinth seal, positioned at spring energy-storage sealing ring close to the side of magnetic fluid seal.Using magnetic fluid seal and labyrinth seal Combination Design, and spring energy-storage sealing ring is set in labyrinth seal, for with rotary shaft radial seal, resistance envelope gas import is added simultaneously so as to make spring energy-storage sealing ring and rotation between centers generate radial clearance by resistance envelope gas in cryogenic pump operational process, so that the sealing device is suitable under high speed rotation sealing operating condition, and can reduce the leakage rate of resistance envelope gas, improve the service life of rotary sealing appts.
Description
Technical field
The utility model relates to mechanical seal fields, and in particular to a kind of cryogenic pump combination sealing arrangement.
Background technique
Centrifugal cryogenic liquid pump (abbreviation cryogenic pump) is to be used to transporting low temperature liquid in petroleum, space division and chemical plant installations
The specific pump of (such as liquid oxygen, liquid nitrogen, liquid argon, liquid hydrocarbon and liquefied natural gas).The working principle of centrifugal cryogenic liquid pump with
Centrifugal water pump is identical.It is to do work by rotary blade to liquid, and the mechanical energy of prime mover is passed to liquid.When being full of in pump
When liquid working, due to impeller high speed rotation, liquid generates centrifugal force under impeller effect, driving liquid from impeller inlet to
During output flow, pressure energy and speed can increase, and speed then can be further converted into pressure again in diffusion room
Power can after export.
Sealing is one of the critical issue in design of cryopumps, currently, the sealing of cryogenic pump mainly has machinery close both at home and abroad
Envelope and labyrinth seal, mechanical seal play the role of sealing medium by friction pair, it is contemplated that centrifugal cryogenic pump is at low temperature
High speed rotation, the medium of sealing is because the fever that mechanical seal rotates is easy to gasify on mechanical sealing friction pairs surface, so that machine
There are dry friction for tool sealing, cause mechanical seal service life short, and replacement is frequent etc., and labyrinth seal relies primarily on resistance envelope gas and plays
Sealing function, very big to the consumption of resistance envelope gas, the control system of furthermore labyrinth seal is complicated, to the more demanding of operator.
A kind of chemical reactor magnetic fluid seal device disclosed in Chinese patent (publication number CN106641273B) and
Its control system, although effectivelying prevent chemical industry by the way that two-stage magnetic seal unit is arranged between seal receptacle and axle sleeve to realize
React the spilling of the gas mediums such as toxic, harmful, inflammable and explosive.However, the magnetic fluid seal device does not account for static shape
State liquid medium can overflow arrival magnetic fluid sealing position and have an impact to magnetic liquid, thus, directly make in cryogenic pump
With magnetic fluid seal device, it will because of influence of the liquid to magnetic fluid under stationary state, magnetic fluid seal is caused to damage
Or failure.
Utility model content
The purpose of this utility model is to provide a kind of cryogenic pump combination sealing arrangements, for substituting mechanical seal and fan
Palace sealing, it is short to solve low temperature mechanical seal for pump occurs in use in the prior art sealing leak and service life
The problems such as and labyrinth seal have that resistance envelope gas consumption is big, process gas leakage rate is big and booting shutdown operation when in use
The problems such as frequent, is suitable for the media such as conveying liquid oxygen, liquid nitrogen, liquid argon, liquid hydrocarbon and liquefied natural gas.
To achieve the above object, the utility model proposes cryogenic pump combination sealing arrangement, comprising:
One rotary shaft；
The outside of rotary shaft is arranged in one labyrinth seal, and one end of which is fixed on base；
One magnetic fluid seal, is axially fixed in the other end of labyrinth seal, and the outside of rotary shaft is arranged in；
One spring energy-storage sealing ring is installed on rotary shaft outside and the annular space between labyrinth seal and rotary shaft,
For radial seal；
One resistance envelope gas import, is opened on labyrinth seal, positioned at spring energy-storage sealing ring close to magnetic fluid seal
Side.
It preferably, further include sealing medium outlet, the sealing medium in the cryogenic pump combination sealing arrangement
Outlet is provided on labyrinth seal, and is located at spring energy-storage sealing ring close to the side of base.
It preferably, further include a pressure medium detection mouth, the medium pressure in the cryogenic pump combination sealing arrangement
Power detection mouth is provided on labyrinth seal, and is located at sealing medium and is exported close to the side of base.
Preferably, in the cryogenic pump combination sealing arrangement, the labyrinth seal include labyrinth seal ring and
Labyrinth seal seat, labyrinth seal seat are arranged in the outside of rotary shaft and are fixed on base, and labyrinth seal ring is arranged in rotary shaft
Outside, spring energy-storage sealing ring are arranged on the outside of rotary shaft, and between labyrinth seal ring and labyrinth seal seat.
Preferably, in the cryogenic pump combination sealing arrangement, the magnetic fluid seal includes magnetic seal seat
And gland, labyrinth seal ring are embedded in one end that magnetic seal seats against nearly labyrinth seal seat, and magnetic seal seat and labyrinth seal
Seat is fixedly connected, and gland is fixedly connected with magnetic seal seat；One installation cavity is formed by magnetic seal seat, gland and rotary shaft, is pacified
Base direction is provided with axis check ring, two bearings and oil sealing by gland in behaveing affectedly, and isolation is arranged in two axis
One or more pole shoe-permanent magnet-pole shoe units between holding.
Preferably, in the cryogenic pump combination sealing arrangement, resistance is offered on the side wall of the magnetic seal seat
Gas inlet channel is sealed, gas inlet communication is sealed in the resistance envelope gas inlet channel and the resistance.
Preferably, in the cryogenic pump combination sealing arrangement, the resistance envelope gas import is close including being provided with labyrinth
Annular groove on seal ring side wall, and be opened on labyrinth seal ring and along its side wall it is circumferentially uniformly distributed several are radially logical
Hole, annular groove are connected to the resistance envelope gas inlet channel and radial through-hole.
Compared with prior art, the utility model has the beneficial effects that
(1) it is designed using contactless magnetic fluid seal and labyrinth seal, fixed friction is not present, it can be effective
Extend the service life of sealing device, and obtain good sealing effect, reduces process gas leakage rate, be more applicable for defeated
The media such as liquor charging oxygen, liquid nitrogen, liquid argon, liquid hydrocarbon and liquefied natural gas；
(2) magnetic fluid seal is connected with labyrinth seal axial restraint, prevents labyrinth seal using magnetic fluid seal
The resistance envelope gas that part is passed through is leak into atmosphere in large quantities, so that resistance envelope gas is only capable of having as a result, towards processing medium side one-way flow
Effect reduces the spilling loss of resistance envelope gas, reduces the consumption of resistance envelope gas；
(3) spring energy-storage sealing ring is set in labyrinth seal, is used for axial seal, it can be under rotary shaft stationary state
Process liquid medium is sealed, the magnetic liquid in process liquid medium effect of flood magnetic fluid seal is avoided, causes
The decline of magnetic fluid seal sealing effect or failure；
(4) under rotary shaft high-speed rotation state, resistance envelope gas is passed through by resistance envelope gas import, the resistance envelope gas of high pressure can overcome
The elastic force of the spring bracing of spring energy-storage sealing ring, so that spring energy-storage sealing ring shrinks and formed between radial direction with rotation between centers
Gap, i.e., under rotary shaft operating condition, spring energy-storage sealing ring and rotary shaft are detached from, and prevent the damage of spring energy-storage sealing ring as a result,
It is bad, overcome the problems, such as that spring energy-storage sealing ring cannot be used for high-speed state, meanwhile, so that the technique liquid medium overflowed is being confused
In the labyrinth flow-path of palace sealing element gasification with resistance envelope gas together by sealing medium export export so that the utility model proposes it is close
Seal apparatus is suitable for high speed rotation and seals occasion.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of cryogenic pump combination sealing arrangement in the utility model；
Fig. 2 is the structural schematic diagram of spring energy-storage sealing ring in the utility model；
Fig. 3 is the sectional view of labyrinth seal ring in the utility model；
Fig. 4 is the left view schematic diagram of Fig. 3.
In figure:
1,22,23- soket head cap screw, 2- gland, 3- magnetic seal seat, 4- outside framework oil seal, 5- axis check ring, 6,
15- bearing, 7,14,16- isolating pad, 8,24-O type circle, 9,11,13- pole shoe, 10,12- permanent magnet, 17- tetrafluoro oil sealing, 18-
Labyrinth seal ring, 19- the first spring energy-storage sealing ring, 19a- ptfe ring, 19b- spring, 20- second spring accumulation of energy sealing ring,
21- labyrinth seal seat, 25- rotary shaft, 100- resistance envelope gas inlet channel, 101- pressure medium detection mouth, 102- sealing medium go out
Mouthful, 103- resistance envelope gas import, 104- annular groove, 105- radial through-hole.
Specific embodiment
It is described in more detail below in conjunction with cryogenic pump of the schematic diagram to the utility model with combination sealing arrangement,
In illustrate the preferred embodiment of the utility model, it should be appreciated that those skilled in the art can modify described herein it is practical
It is novel, and still realize the advantageous effects of the utility model.Therefore, following description should be understood as those skilled in the art
Member's is widely known, and is not intended as limitations of the present invention.
A kind of cryogenic pump combination sealing arrangement, referring to Figure 1, including rotary shaft 25, one end of the rotary shaft 25 and electricity
Machine is connected, and the other end connects impeller, and 25 impeller high-speed rotation of rotary shaft is driven by motor and then realizes process liquid medium
Conveying.Magnetic fluid seal and labyrinth seal are successively arranged from motor side to impeller end in the outside of the rotary shaft 25.
In the present invention, rotary shaft 25 is rotating member, and magnetic fluid seal and labyrinth seal are fixing piece.Tool
It for body, is achieved a fixed connection between fixing piece by screw, in particular by soket head cap screw, i.e. magnetic fluid seal and fan
Palace sealing element is fixed together to form combination sealing arrangement by soket head cap screw 22, and entire combination sealing arrangement passes through interior
Hex screw 23 is fixed on base.
Referring again to Fig. 1, magnetic fluid seal includes the gland 2 and magnetic seal seat 3 being arranged in outside rotary shaft 25.
Gland 2 is fixed on the motor side of magnetic seal seat 3 by soket head cap screw 1, gland 2, magnetic seal seat 3 and rotary shaft 25 it
Between form an installation cavity, the effect of gland 2 be the intracorporal sealing unit of chamber and part axial is fixed in the cavity, further plus
Gu the fastness of sealing unit and part.Magnetic fluid sealing unit is provided in the installation cavity, specifically, by electricity in installation cavity
Generator terminal is successively arranged axis check ring 5, bearing 6, isolating pad 7, pole shoe 9, permanent magnet 10, pole shoe 11, permanent magnet to impeller end
12, pole shoe 13, isolating pad 14, bearing 15, isolating pad 16 and tetrafluoro oil sealing 17.In order to which blocks dust enters 25 annular space of rotary shaft
The sealing effect of combination sealing arrangement is had an impact, outside framework oil seal 4 is installed for blocks dust in the outside of gland 2.Its
In, it is provided with O-ring seal 8 between magnetic seal seat 3 and each pole shoe (9,11,13), to reinforce entire magnetic fluid
The leakproofness of sealing element, the setting of O-ring seal can companies according to specific seal request, between the structure or component of each component
Leakproofness is connect to set installation, its purpose is to realize the leakproofness of entire sealing device, this point is for art technology
Be for personnel it is conventional and easy to accomplish, be not specifically limited herein.
The pole shoe (9,11,13) of above-mentioned magnetic fluid seal and the annular space of rotary shaft 25 are filled with magnetic liquid, the magnetism
Liquid be numerous nanoscale ferromagnetism or ferri-magnetic material highly dispersed are constituted in liquid carrier it is a kind of high steady
The colloidal solution of setting, also known as magnetic fluid, ferromagnetic fluid, also referred to as ferrofluid belong to existing commercial product.In magnetic fluid
In, particle and carrier fluid by interfacial agent it is muddy at magnetic liquid, can be long-term under the action of gravitational field, electric field or magnetic field
Stable presence does not generate and precipitates and separate.Magnetic liquid is mounted in the gap between pole shoe (9,11,13) and rotary shaft 25,
The structure being made of static permanent magnet, pole shoe and the rotary shaft of rotation, the magnetic line of force is gathered between the radius of each piece of pole shoe
Under gap, so that magnetic liquid generates liquid "O" ring, to generate reliable sealing.
Referring again to Fig. 1, labyrinth seal includes labyrinth seal ring 18 and labyrinth seal seat 21.18 He of labyrinth seal ring
Sealing between labyrinth seal seat 21 and rotary shaft 25 using labyrinth seal form, i.e., rotational parts and retaining element it
Between make to leak reduced sealing there are many tortuous cell.It is general in the inner ring surface of labyrinth seal ring 18 and labyrinth seal seat 21
Equipped with the ring packing teeth that several are arranged successively, a series of shut off gap and expansion cavitys are formed between tooth and tooth, to be formed
Labyrinth flow-path realizes labyrinth seal.Ring packing teeth can be rectangular teeth type, stagger arrangement flute profile, through-type, composite straight flow-through, rank
The common forms such as ladder type, helical teeth step type or honeycomb type, those skilled in the art can select according to specific sealing,
Therefore details are not described herein.
Labyrinth seal ring 18 is embedded in the installation cavity right end of magnetic fluid seal, by soket head cap screw by labyrinth seal seat
21 are anchored on labyrinth seal seat 21 and magnetic seal together with 3 axial restraint of magnetic seal seat, while by labyrinth seal ring 18
Between seat 3.Labyrinth seal seat 21 is fixed on base by soket head cap screw 23, in the connecting pin of labyrinth seal seat 21 and base
O-ring seal 24 can be set on face.
Due to the generally liquid process medium of cryogenic pump conveying, in a non-operative state, although by labyrinth seal pair
Liquid medium is sealed in pumping, but still is not avoided that under stationary state, and liquid medium reaches magnetic fluid seal position to magnetic
Property fluid have an impact, as a result, between labyrinth seal ring 18 and labyrinth seal seat 21 be equipped with the first spring energy-storage sealing ring
19, which is arranged in the outside of rotary shaft 25, and sealing lip is tightly attached to the interior of labyrinth seal seat 21
The outer wall of wall and rotary shaft 25 is used to form radial seal, prevents under stationary state that be spilled over to magnetic fluid close for liquid medium as a result,
At sealing.
The spring energy-storage sealing ring is generally made of polymeric material capsul and corrosion resistant stainless steel metal spring, at this
In embodiment, spring energy-storage sealing ring is made of ptfe ring 19a and spring 19b, refers to Fig. 2, will by the elastic force of spring 19b
Ptfe ring 19a is strutted, can subzero 200 degrees Celsius use, so as to be applied to conveying liquid oxygen, liquid nitrogen, liquid argon, liquid hydrocarbon and
The sealing of the cryogenic medias such as liquefied natural gas.In addition, also being installed between labyrinth seal ring 18 and the end face of labyrinth seal seat 21
There is second spring accumulation of energy sealing ring 20, sealing lip is tightly attached to the end face of labyrinth seal ring 18 and the end face of labyrinth seal seat 21,
It is used to form end face seal.
The first spring energy-storage due to high speed rotation under 25 working condition of rotary shaft of cryogenic pump, positioned at 25 outside of rotary shaft
Sealing ring 19 is applied under high speed rotation operating condition, and easily abrasion makes its seal failure, cannot apply in view of spring energy-storage sealing ring
Under high speed conditions, in the present invention, resistance envelope gas import 103 is additionally arranged on labyrinth seal, in 25 turns of rotary shaft
Before dynamic, it is passed through high pressure drag envelope gas and the first spring energy-storage sealing ring 19 can be beaten in the case where atmospheric pressure is sealed in resistance between rotary shaft 25
A radial clearance is opened, i.e., so that the sealing lip of the first spring energy-storage sealing ring 19 and rotary shaft 25 are detached from, to prevent from revolving
Spring energy-storage sealing ring damages when shaft 25 operates.
Specifically, referring again to Fig. 1, resistance envelope is offered on the side wall of the corresponding labyrinth seal ring 18 of magnetic seal seat 3
Gas inlet channel 100 offers and hinders the resistance envelope gas import 103 that envelope gas inlet channel 100 be connected on labyrinth seal ring 18.It please join
See Fig. 3 and Fig. 4, resistance envelope gas import 103 includes annular groove 104 and several radial through-hole 105 being connected to annular groove 104, ring
Shape slot 104 is provided on the side wall of labyrinth seal ring 18, several radial through-hole 105 are circumferentially equal along the side wall of labyrinth seal ring 18
Cloth opens up, several radial through-hole 105 are used to guarantee being uniformly distributed for the resistance envelope gas entered.It is opened up on labyrinth seal seat 21
There are sealing medium outlet 102 and pressure medium detection mouth 101, pressure medium detection mouth 101 is located at sealing medium outlet 102 and leans on
The side of nearly base is located at the right side of sealing medium outlet 102.
Before cryogenic pump booting, resistance envelope gas inlet channel 100 is in close state, and sealing medium outlet 102, which is in, opens
State closes sealing medium outlet 102, pressure medium detection mouth 101 is for monitoring after hydraulically full medium in cryogenic pump
Interior media pressure, at this point, the liquid medium in pump mainly passes through the first spring energy-storage sealing ring 19 and plays sealing function, generally
In the case of, low-temperature-resistant is not to -196 degrees Celsius and extraneous medium easily interferes the performance of its magnetic fluid for magnetic fluid seal, and
First spring energy-storage sealing ring 19 of the ptfe ring 19a material that the utility model uses can be normal under subzero 200 degrees Celsius
Work, and prevent from pumping the sealing position that interior cryogenic liquid medium is flowed into magnetic fluid seal, guarantee magnetic liquid using temperature
It spends in range and works normally.
After 101 measuring pressures of medium pressure liquid detection mouth are stablized in cryogenic pump, before preparing booting, gas air inlet is sealed into resistance
Channel 100 is opened, will resistance envelope gas (nitrogen, argon gas, helium etc. on drying medium gas of the liquid medium without influence in pumping,
Drying medium gas especially identical with interior liquid medium ingredient is pumped, such as pumping interior liquid medium is liquid nitrogen, then selects dry nitrogen
Gas seals gas as resistance) gas inlet channel 100 is sealed into resistance envelope gas import 103 inflow labyrinth seal ring 18 and rotary shaft 25 by hindering
Annular space, the pressure which seals gas are greater than the pressure for pumping interior liquid medium, and under the pressure effect of resistance envelope gas, the first spring energy-storage is close
Seal 19 can open, i.e. the pressure of resistance envelope gas can overcome the spring force of the first spring energy-storage sealing ring 19, so that first
The spring of spring energy-storage sealing ring 19 is compressed towards the direction far from rotary shaft 25, so that its sealing lip separates no longer with rotary shaft 25
It is bonded with rotary shaft 25.
After opening a radial clearance between the first spring energy-storage sealing ring 19 and rotary shaft 25, it can be switched on, lead at this time
To prevent from pumping the leakage of interior medium by resistance envelope gas, magnetic fluid seal prevents resistance envelope gas leakage for sealing resistance envelope gas.Low
In temperature pump booting operation engineering, liquid medium gasifies after labyrinth seal in pump, and seals gas with resistance at sealing medium outlet 102
Air pressure reach balance, then hinder envelope gas and the sealed media outlet 102 of liquid medium in the pump of gasification swept along to draw.
By above-mentioned measure, solves tradition machinery and be sealed in production, operation and the maintenance installed and used and occurred in the process
The problems such as cost input is higher and sealing is short using functional lifetime solves labyrinth seal and has that resistance envelope gas consumption is big, gas
The problems such as body leakage rate is big, booting and shutdown operation are cumbersome.
The preferred embodiment that above are only the utility model, does not play the role of any restrictions to the utility model.
Any person of ordinary skill in the field, in the range of not departing from the technical solution of the utility model, to the utility model
The technical solution and technology contents of exposure make the variation such as any type of equivalent replacement or modification, belong to without departing from the utility model
Technical solution content, still fall within the protection scope of the utility model.
Claims (7)
1. a kind of cryogenic pump combination sealing arrangement characterized by comprising
One rotary shaft (25)；
One labyrinth seal is arranged in the outside of rotary shaft (25), and one end of which is fixed on base；
One magnetic fluid seal is axially fixed in the other end of labyrinth seal, and is arranged in the outside of rotary shaft (25)；
One spring energy-storage sealing ring (19) is installed on the outside of rotary shaft (25) and between labyrinth seal and rotary shaft (25)
Annular space, be used for radial seal；
One resistance envelope gas import (103), is opened on labyrinth seal, is located at spring energy-storage sealing ring (19) close to magnet fluid sealing
The side of part.
2. cryogenic pump combination sealing arrangement according to claim 1, which is characterized in that further include sealing medium outlet
(102), sealing medium outlet (102) is provided on labyrinth seal, and is located at spring energy-storage sealing ring close to the one of base
Side.
3. cryogenic pump combination sealing arrangement according to claim 2, which is characterized in that further include pressure medium detection
Mouth (101), the pressure medium detection mouth (101) are provided on labyrinth seal, and are located at sealing medium outlet (102) close to machine
The side of seat.
4. cryogenic pump combination sealing arrangement according to claim 1,2 or 3, which is characterized in that the labyrinth seal
Including labyrinth seal ring (18) and labyrinth seal seat (21), the outside in rotary shaft (25) and fixation is arranged in labyrinth seal seat (21)
On base, on the outside of rotary shaft (25), spring energy-storage sealing ring (19) is arranged in rotary shaft for labyrinth seal ring (18) setting
(25) outside, and between labyrinth seal ring (18) and labyrinth seal seat (21).
5. cryogenic pump combination sealing arrangement according to claim 4, which is characterized in that the magnetic fluid seal includes
Magnetic seal seat (3) and gland (2), labyrinth seal ring (18) are embedded in magnetic seal seat (3) close to labyrinth seal seat (21)
One end, and magnetic seal seat (3) is fixedly connected with labyrinth seal seat (21), gland (2) is fixedly connected with magnetic seal seat (3)；
One installation cavity is formed by magnetic seal seat (3), gland (2) and rotary shaft (25), is set by gland (2) towards base direction in installation cavity
It is equipped with axis check ring (5), two bearings (6,15) and oil sealing (17), and isolation is arranged between two bearings (6,15)
One or more pole shoe-permanent magnet-pole shoe units.
6. cryogenic pump combination sealing arrangement according to claim 5, which is characterized in that the magnetic seal seat (3)
Resistance envelope gas inlet channel (100), resistance envelope gas inlet channel (100) and resistance envelope gas import (103) are offered on side wall
Connection.
7. cryogenic pump combination sealing arrangement according to claim 6, which is characterized in that gas import (103) are sealed in the resistance
Including the annular groove (104) being provided on labyrinth seal ring (18) side wall, and be opened on labyrinth seal ring (18) and edge
Several circumferentially uniformly distributed radial through-hole (105) of its side wall, annular groove (104) be connected to the resistance seal gas inlet channel (100) and
Radial through-hole (105).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821481547.8U CN209041569U (en) | 2018-09-11 | 2018-09-11 | A kind of cryogenic pump combination sealing arrangement |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821481547.8U CN209041569U (en) | 2018-09-11 | 2018-09-11 | A kind of cryogenic pump combination sealing arrangement |
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| CN209041569U true CN209041569U (en) | 2019-06-28 |
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| CN201821481547.8U Active CN209041569U (en) | 2018-09-11 | 2018-09-11 | A kind of cryogenic pump combination sealing arrangement |
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| CN112387225A (en) * | 2020-10-30 | 2021-02-23 | 清华大学 | Composite magnetic medium sealing device for reaction kettle |
| CN112431925A (en) * | 2020-11-23 | 2021-03-02 | 清华大学 | Magnetic liquid composite sealing device |
| CN113357375A (en) * | 2021-07-14 | 2021-09-07 | 北京交通大学 | Magnetic liquid combined sealing device with anti-pollution function |
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| US11261972B1 (en) | 2020-11-23 | 2022-03-01 | Tsinghua University | Combined sealing device with magnetic fluid |
| CN113357375A (en) * | 2021-07-14 | 2021-09-07 | 北京交通大学 | Magnetic liquid combined sealing device with anti-pollution function |
| CN114087368A (en) * | 2021-11-09 | 2022-02-25 | 无锡全世全流体科技有限公司 | Combined sealing device for horizontal screw conveyor |
| CN115030913A (en) * | 2022-05-23 | 2022-09-09 | 西华大学 | A magnetic fluid sealing device for large shaft diameter centrifugal compressor |
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