CN106996361A - A kind of linear motor plunger pump - Google Patents
A kind of linear motor plunger pump Download PDFInfo
- Publication number
- CN106996361A CN106996361A CN201710292343.3A CN201710292343A CN106996361A CN 106996361 A CN106996361 A CN 106996361A CN 201710292343 A CN201710292343 A CN 201710292343A CN 106996361 A CN106996361 A CN 106996361A
- Authority
- CN
- China
- Prior art keywords
- plunger
- mover
- pump housing
- pump
- linear motor
- 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.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
- F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/02—Packing the free space between cylinders and pistons
Abstract
The invention discloses a kind of linear motor plunger pump, including frame, stator, mover, the first plunger, the second plunger and first pump housing, second pump housing, stator is coaxially set in outside mover, there is gap between stator and mover, mover is hollow structure and has the first cavity volume and the second cavity volume, first cavity volume is connected with first pump housing, second cavity volume is connected with second pump housing, first plunger, the axis of the second plunger are overlapped with the axis of mover, and seal assembly is respectively provided between the first plunger, the second plunger and mover.The present invention is positioned by frame, is carried out coaxially positioning, installation to the parts of electric mover, stator and other cooperatings, it is ensured that the air gap between stator and mover, is realized the safe and reliable operation of linear motor pumps；Meanwhile, variable cavity volume is provided to move back and forth using the mover of hollow structure, the size of linear motor plunger pump is substantially reduced, is that production application is provided convenience.
Description
Technical field
The present invention relates to reciprocating pump field, more particularly to a kind of linear motor plunger pump.
Background technology
The reciprocating pump of linear electric motors driving should obtain comprehensive popularization and application with its exclusive advantage, but actually straight
But there is many defects in the application example of line motor reciprocating pump.Except high thrust linear electric motors manufacture and design the difficulty of aspect in itself
Outside, linear electric motors are moved back and forth after mover and reciprocal pump plunger (piston) link together, exist linear motor rotor with
The problem of air gap between stator is difficult to Reliable guarantee, meanwhile, also generally existing is special due to plunger (piston) gravity, frictional force
It is not that the mechanical resistance that eccentric wear is produced causes linear electric motors staring torque excessive and straight line motor reciprocative pump vibration-direction
Overall dimensions are excessive, install and use the phenomenons such as inconvenience.
China Patent No. 201320628111 is disclosed " linear electric motors driving bidirectional reciprocating pump ", the patent No.
200620033246 disclosed " double-acting multi-cylinder reciprocating pumps of linear electric motors driving " etc., all do not solve the above problems, attached
It is simple in figure to be made of one linear electric motors reciprocating motion mover with piston, it is actually not so simple, because past
The thrust ratio needed during multiple pump work is larger, has from 10000N to 500000N, and general common thrust is also required to 20000N
~100000N.And linear motor pushing force is directly proportional to diameter of stator bore, the internal diameter of the big stator of thrust is just big, that is to say, that reciprocal fortune
The external diameter of dynamic mover is just big.And reciprocating pump is mainly used in high-pressure low-flow field, true upper plug (piston) diameter is more than straight
Line electric mover external diameter it is seldom, that is to say, that linear motor rotor and plunger (piston) are linked into sealed letter body
The possibility very little of (cylinder sleeve), more importantly linear motor rotor enter reciprocating pump hydraulic-end after, pumped medium be possible to stream
The trouble free service of motor can be influenceed into air gap by entering mover surface.
China Patent No. 2016109969611 disclosed " one kind do more physical exercises unit straight line motor drive type plunger pump " is clearly
Elaborate, linear electric motors and cylinder body can carry out transverse shifting along base, to facilitate the concentricity between adjustment parts；Straight-line electric
The end face ball bearing connected between machine and plunger small range can also be twisted in space, make directly to drive pumping system in little deviation scope
The interior function with Self-aligning.But adjustment parts axiality is unreliable in practice also to be difficult to ensure.Rely on linear electric motors with
The end face ball bearing connected between plunger small range in space is twisted, but as long as there is twisting just to have dislocation, then linear electric motors
The air gap of mover and stator is difficult to ensure, while apparent this straight line motor drive type plunger pump vibration-direction is overall
Size is very long.
Therefore, the long present situation of straight line motor reciprocative pump axial dimension how is changed, while in linear motor rotor and post
The effective air gap ensured between linear motor rotor and stator after plug connection, it is ensured that motor operation safety, is art technology
Personnel's urgent problem to be solved.
The content of the invention
It is an object of the invention to provide a kind of linear motor plunger pump, to solve the problem of above-mentioned prior art is present, change
Become the long present situation of straight line motor reciprocative pump axial dimension, while the air gap between linear motor rotor and stator is effectively ensured,
Make motor operation safer.
To achieve the above object, the invention provides following scheme：The present invention provides a kind of linear motor plunger pump, including
Frame, the stator being arranged in the frame, mover, the first plunger, the second plunger and first pump housing being connected with the frame,
Second pump housing, the stator is coaxially set in outside the mover, has gap between the stator and the mover, described dynamic
Son is for hollow structure and with the first cavity volume and the second cavity volume, and first cavity volume is connected with first pump housing,
One end of first plunger is arranged in first cavity volume, and the other end of first plunger is fixed on first pump
On body, second cavity volume is connected with second pump housing, and one end of second plunger is arranged at second volume
Intracavitary, the other end of second plunger is fixed on second pump housing, first plunger, the axis of second plunger
Overlapped with the axis of the mover, seal assembly is respectively provided between first plunger, second plunger and the mover.
Preferably, first plunger, second plunger are hollow structure, and first plunger has first-class
Road, the first flow is connected with first pump housing, and second plunger has second flow channel, the second flow channel and institute
Second pump housing is stated to be connected.
Preferably, linear motor plunger pump also includes positioning sleeve and end cap, and the positioning sleeve, the quantity of the end cap are
Two, two positioning sleeves are respectively arranged at the two ends of the stator through the mover, and the support ring is moved through described
It is sub to be connected with the frame and compress the positioning sleeve.
Preferably, the positioning sleeve using Porous, with lubricating grease there is affinity characteristic, non-magnetic material to be made.
Preferably, dust slinger is set between the support ring and the mover.
Preferably, linear motor plunger pump also includes back-up roller wheel component, and the back-up roller wheel component includes support and institute
The connected rotating shaft of support and the roller being installed in the rotating shaft are stated, the axis of the rotating shaft is vertical with the axis of the mover,
The support is fixed in the frame, and the top of the roller is contacted with the mover, between the roller and the rotating shaft
Install bearing additional.
Preferably, between first pump housing and first plunger, between second pump housing and second plunger
Sealing ring is respectively provided with, first pump housing and second pump housing are connected by screw bolts with the frame respectively.
The present invention achieves following technique effect relative to prior art：The linear motor plunger pump that the present invention is provided, leads to
Frame positioning is crossed, coaxially positioning, installation are carried out to the parts of electric mover, stator and other cooperatings, it is ensured that fixed
Air gap between son and mover, realizes the safe and reliable operation of linear motor pumps；Meanwhile, it is past using the mover of hollow structure
Multiple motion provides variable cavity volume, substantially reduces the size of linear motor plunger pump, is that production application is provided convenience.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to institute in embodiment
The accompanying drawing needed to use is briefly described, it should be apparent that, drawings in the following description are only some implementations of the present invention
Example, for those of ordinary skill in the art, without having to pay creative labor, can also be according to these accompanying drawings
Obtain other accompanying drawings.
Fig. 1 is the structural representation of linear motor plunger pump of the present invention；
Fig. 2 is the structure enlarged diagram of back-up roller wheel component of the present invention；
Fig. 3 is the structure enlarged diagram of seal assembly component of the present invention；
Wherein, 1 is frame, and 2 be stator, and 3 be mover, and 301 be the first cavity volume, and 302 be the second cavity volume, and 4 be first
Plunger, 401 be first flow, and 5 be the second plunger, and 501 be second flow channel, and 6 be first pump housing, and 7 be second pump housing, and 8 be sealing
Component, 801 be guide sleeve, and 802 be filler, and 803 be preloading spring, and 804 be gland, and 9 be positioning sleeve, and 10 be end cap, and 11 be anti-
Dirt back-up ring, 12 be back-up roller wheel component, and 1201 be support, and 1202 be rotating shaft, and 1203 be roller, and 13 be sealing ring.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
It is an object of the invention to provide a kind of linear motor plunger pump, to solve the problem of above-mentioned prior art is present, change
Become the long present situation of straight line motor reciprocative pump axial dimension, while the air gap between linear motor rotor and stator is effectively ensured,
Make motor operation safer.
In order to facilitate the understanding of the purposes, features and advantages of the present invention, it is below in conjunction with the accompanying drawings and specific real
Applying mode, the present invention is further detailed explanation.
Fig. 1 to Fig. 3 is refer to, Fig. 1 is the structural representation of linear motor plunger pump of the present invention, and Fig. 2 supports for the present invention
The structure enlarged diagram of roll wheel assembly, Fig. 3 is the structure enlarged diagram of seal assembly component of the present invention.
The present invention provides a kind of linear motor plunger pump, including frame 1, the stator 2 being arranged in frame 1, mover 3, the
One plunger 4, the second plunger 5 and first pump housing 6 being connected with frame 1, second pump housing 7, stator 2 are coaxially set in outside mover 3,
There is gap, mover 3 is hollow structure and has the first cavity volume 301 and the second cavity volume 302 between stator 2 and mover 3, the
One cavity volume 301 is connected with first pump housing 6, and one end of the first plunger 4 is arranged in the first cavity volume 302, the first plunger 4
The other end be fixed on first pump housing 6, the second cavity volume 302 is connected with second pump housing 7, and one end of the second plunger 5 is set
In in the second cavity volume 302, the other end of the second plunger 5 is fixed on second pump housing 7, the first plunger 4, the axle of the second plunger 5
Line is overlapped with the axis of mover 3, and seal assembly 8 is respectively provided between the first plunger 4, the second plunger 5 and mover 3.
When linear motor plunger pump works, mover 3 is moved right, and the volume of the first cavity volume 301 becomes larger, and medium leads to
The suction valve group for crossing first pump housing 6 enters in the first cavity volume 301, and now, the volume of the second cavity volume 302 is tapered into, the
Medium in two cavity volumes 302 is discharged by the discharge valve group of second pump housing 7, is and so on moved, is realized reciprocating plunger
The function of pump.
Positioned in the present invention by frame 1, mover 3, the plunger 4 of stator 2 and first, the second plunger 5 to motor are carried out
Coaxial positioning, installation, it is ensured that the air gap between stator 2 and mover 3, realize the safe and reliable operation of linear motor pumps；With
This provides variable cavity volume to move back and forth using the mover 3 of hollow structure, substantially reduces linear motor plunger pump simultaneously
Size, be that production application is provided convenience, meanwhile, continuous media flow in the first cavity volume 301, the second cavity volume 302
The heat of motor generation has been taken away, the security of motor operation is improved.
Specifically, the first plunger 4, the second plunger 5 are hollow structure, and the first plunger 4 has first flow 401, first
Runner 401 is connected with first pump housing 6, and the second plunger 5 has second flow channel 501, and second flow channel 501 is connected with second pump housing 7
It is logical.First cavity volume 301 is connected by first flow 401 with first pump housing 6, and the second cavity volume 302 passes through second flow channel 501
It is connected with second pump housing 7.
Linear motor plunger pump also includes positioning sleeve 9 and end cap 10, and positioning sleeve 9, the quantity of end cap 10 are two, positioning
Set 9 is respectively arranged at the left and right ends of stator 2 through mover 3, and end cap 10 is connected with frame 1 through mover 3 and presses positioning sleeve 9
Tightly.In this embodiment, the diameter of positioning sleeve 9 is big compared with the diameter of stator 2, and positioning sleeve 9 is oriented to through mover 3 for it
Meanwhile, positioning sleeve 9 is engaged with the stepped hole being arranged in frame 1 so that stator 2 is installed, positions more convenient, end cap 10 and machine
Frame 1 is fixedly connected, and positioning sleeve 9 is compressed.
Wherein, positioning sleeve 9 using Porous, with lubricating grease there is affinity characteristic, non-magnetic material to be made.For mover
3 are oriented to while avoid the mover 3 from deflection or eccentric wear occur, are that mover 3 provides certain lubrication.
More specifically, setting dust slinger 11 between end cap 10 and mover 3.The setting of dust slinger 11, can effectively hinder
The air gap that introduced contaminants enters between stator 2 and mover 3 is kept off, the work to linear motor plunger pump is impacted.
Linear motor plunger pump also includes back-up roller wheel component 12, and back-up roller wheel component includes support 1201 and support
1201 connected rotating shafts 1202 and the roller 1203 being installed in rotating shaft 1202, the axis of rotating shaft 1202 hang down with the axis of mover 3
Directly, support 1201 is fixed in frame 1, and the top of roller 1203 is contacted with mover, is installed additional between roller 1203 and rotating shaft 1202
Bearing.Back-up roller wheel component 12 is fixed in frame 1, is in rolling contact between top and mover 3, prevents mover 3 due under deadweight
It is heavy and cause the air gap between stator 2 and mover 3 not ensure, or occur the first cavity volume 301 of destruction and the first plunger 4,
Between second cavity volume 302 and the second plunger 5 the problems such as sealing property, so that influence linear motor plunger pump normal work.
Further, support 1201 has is provided with the projection being engaged with U-lag, support in U-lag, rotating shaft 1202
1201 be H-shaped structure, and the bottom of U-lag, which is opened up, to be set studs and fixed with stop nut in tapped through hole, tapped through hole.
Fig. 2 is refer to, support 1201 opens up the projection that setting is engaged with U-lag in U-lag, rotating shaft 1202, installs positioning side
Just, fast, the bottom of U-lag, which is opened up, sets studs in tapped through hole, tapped through hole, installing, debugging straight-line electric column
During filling in pump, the studs in adjustment screwed hole, you can reach that correction, fine setting mover 3 are allowed to floating mount in stator 2
In purpose, while ensureing the air gap between mover 3 and stator 2.Also other adjustment modes such as hydraulic pressure, startup etc. can be used.
The quantity of back-up roller wheel component 12 is two, and back-up roller wheel component 12 is respectively arranged at the two ends of end cap 10, support
The distance of roll wheel assembly 12 and the center line of mover 3 is less than 1/2nd of the movement travel of mover 3, and back-up roller wheel is determined by calculating
The installation site of component 12, it is ensured that it plays a role and will not interfere with the motion of mover 3, in the other embodiment of the present invention
In, multiple back-up roller wheel components 12 can also be set.
Further, seal assembly 8 includes four groups of guide sleeves 801, filler 802, preloading spring 803 and gland 804,
Filler 802, preloading spring 803 are arranged between guide sleeve 801, and gland 804 is threadedly coupled with mover 3 and is directed to set 801 and presses
Tightly, in this embodiment, guide sleeve 801 is annular, and the two groups of guide sleeves 801 contacted with preloading spring 803 carry energy
Enough the fixed groove of preloading spring 803, refer to Fig. 3, and in the other embodiment of the present invention, guide sleeve 801 can also be adopted
It is engaged with forms such as positioning holes with preloading spring 803.Due to being inconvenient to adjust seal assembly 8 in the reciprocating motion of mover 3
Tightness, needs to shut down adjustment, seal assembly 8 of the invention sets preloading spring 803, straight during if there is sealing leak
In the line engine plunger pump course of work seal assembly 8 is voluntarily adjusted by the elastic force of preloading spring 803 and the pressure of discharge
Elasticity, to realize reliable sealing.
Sealing ring 13, first are respectively provided between first pump housing 6 and the first plunger 4, between second pump housing 7 and the second plunger 5
The pump housing 7 of the pump housing 6 and second is connected by screw bolts with frame 1 respectively.
Operationally, mover 3 is moved right the linear motor plunger pump of the present invention, and the volume of the first cavity volume 301 is gradually
Become big, medium is by the suction valve group in first pump housing 6, and the first flow 401 through the first plunger 4 enters the first cavity volume 301,
The automatic-sealed in the presence of sealing preloading spring 803 of seal assembly 8, medium is inhaled into, at the same time, the second cavity volume 302
Volume is tapered into, and the seal assembly 8 between the second cavity volume 302 and the second plunger 5 is in preloading spring 803 and discharge
Second flow channel 501 of the medium through the second plunger 5 in automatic-sealed under the collective effect of pressure, the second cavity volume 302 passes through pump
Internal discharge valve group is discharged.Such left and right reciprocation cycle, realizes the function of reciprocating pump.
Coaxial positioning hole in frame 1 is effectively guaranteed linear motor stator electric 2 and mover 3 when manufacturing and designing installation
Between air gap, also set up the plunger mounting hole coaxial with the mounting hole of stator 2 in frame 1, the first plunger 4, be effectively ensured
Two plungers 5 and mover 3 are coaxial, it is to avoid the influence of the first plunger 4, the second plunger 5 to the air gap between stator 2 and mover 3, peace
Back-up roller wheel component 12 mounted in the downside of mover 3 solves mover 3 due to the problem of deadweight is sunk, while also ensure that mover 7
The first cavity volume 301, the second cavity volume 302 and seal assembly 8 be reciprocating and sealing reliability, it is ensured that plunger pump
Performance and life-span.
Specific case is applied in the present invention to be set forth the principle and embodiment of the present invention, above example
Illustrate the method and its core concept for being only intended to help to understand the present invention；Simultaneously for those of ordinary skill in the art, according to
According to the thought of the present invention, it will change in specific embodiments and applications.In summary, this specification content
It should not be construed as limiting the invention.
Claims (6)
1. a kind of linear motor plunger pump, it is characterised in that：Including frame, the stator being arranged in the frame, mover, first
Plunger, the second plunger and first pump housing being connected with the frame, second pump housing, the stator are coaxially set in outside the mover
Portion, has gap between the stator and the mover, the mover is hollow structure and held with the first cavity volume and second
Product chamber, first cavity volume is connected with first pump housing, and one end of first plunger is arranged at first volume
Intracavitary, the other end of first plunger is fixed on first pump housing, second cavity volume and second pump housing phase
Connection, one end of second plunger is arranged in second cavity volume, and the other end of second plunger is fixed on described
On second pump housing, first plunger, the axis of second plunger are overlapped with the axis of the mover, first plunger,
Seal assembly is respectively provided between second plunger and the mover.
2. linear motor plunger pump according to claim 1, it is characterised in that：First plunger, second plunger
It is hollow structure, first plunger has first flow, the first flow is connected with first pump housing, described
Two plungers have second flow channel, and the second flow channel is connected with second pump housing.
3. linear motor plunger pump according to claim 1, it is characterised in that：Also include positioning sleeve and end cap, it is described fixed
Position set, the quantity of the end cap are two, and two positioning sleeves are respectively arranged at the two of the stator through the mover
End, the end cap is connected with the frame through the mover and compresses the positioning sleeve.
4. linear motor plunger pump according to claim 3, it is characterised in that：The positioning sleeve is using Porous, with moistening
There is consistent lubricant affinity characteristic, non-magnetic material to be made.
5. linear motor plunger pump according to claim 3, it is characterised in that：Set between the end cap and the mover
Dust slinger.
6. linear motor plunger pump according to claim 1, it is characterised in that：First pump housing and first plunger
Between, sealing ring, first pump housing and second pump housing point are respectively provided between second pump housing and second plunger
It is not connected by screw bolts with the frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710292343.3A CN106996361B (en) | 2017-04-28 | 2017-04-28 | A kind of linear motor plunger pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710292343.3A CN106996361B (en) | 2017-04-28 | 2017-04-28 | A kind of linear motor plunger pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106996361A true CN106996361A (en) | 2017-08-01 |
| CN106996361B CN106996361B (en) | 2019-01-18 |
Family
ID=59435189
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710292343.3A Active CN106996361B (en) | 2017-04-28 | 2017-04-28 | A kind of linear motor plunger pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106996361B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109356810A (en) * | 2018-09-21 | 2019-02-19 | 徐州工程学院 | A kind of cam-type multi-stage compression high-pressure mini air pump |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1554868A (en) * | 2003-12-23 | 2004-12-15 | 俞国淼 | Magnetic linear piston pump |
| CN1566632A (en) * | 2003-06-28 | 2005-01-19 | 梁小恩 | Ternate plunger pump for high pressure industry |
| US7699097B2 (en) * | 2008-06-11 | 2010-04-20 | Digitek Technology Co., Ltd. | Mover stabilizing and stator cooling arrangement of a 3-phase linear motor of a submersible oil pump |
| CN201461346U (en) * | 2009-07-23 | 2010-05-12 | 文艺源 | Two-way plunger piston oil-extraction electric pump |
| CN101743024A (en) * | 2007-05-16 | 2010-06-16 | 史密斯医疗Asd公司 | Pump module for use in a medical fluid dispensing system |
-
2017
- 2017-04-28 CN CN201710292343.3A patent/CN106996361B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1566632A (en) * | 2003-06-28 | 2005-01-19 | 梁小恩 | Ternate plunger pump for high pressure industry |
| CN1554868A (en) * | 2003-12-23 | 2004-12-15 | 俞国淼 | Magnetic linear piston pump |
| CN101743024A (en) * | 2007-05-16 | 2010-06-16 | 史密斯医疗Asd公司 | Pump module for use in a medical fluid dispensing system |
| US7699097B2 (en) * | 2008-06-11 | 2010-04-20 | Digitek Technology Co., Ltd. | Mover stabilizing and stator cooling arrangement of a 3-phase linear motor of a submersible oil pump |
| CN201461346U (en) * | 2009-07-23 | 2010-05-12 | 文艺源 | Two-way plunger piston oil-extraction electric pump |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109356810A (en) * | 2018-09-21 | 2019-02-19 | 徐州工程学院 | A kind of cam-type multi-stage compression high-pressure mini air pump |
| CN109356810B (en) * | 2018-09-21 | 2019-10-25 | 徐州工程学院 | A kind of cam-type multi-stage compression high-pressure mini air pump |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106996361B (en) | 2019-01-18 |
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