CN106996361B - A kind of linear motor plunger pump - Google Patents
A kind of linear motor plunger pump Download PDFInfo
- Publication number
- CN106996361B CN106996361B CN201710292343.3A CN201710292343A CN106996361B CN 106996361 B CN106996361 B CN 106996361B CN 201710292343 A CN201710292343 A CN 201710292343A CN 106996361 B CN106996361 B CN 106996361B
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- China
- Prior art keywords
- plunger
- mover
- pump housing
- linear motor
- cavity volume
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Classifications
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- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
- Linear Motors (AREA)
Abstract
The invention discloses a kind of linear motor plunger pumps, including rack, 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, are respectively provided with seal assembly between the first plunger, the second plunger and mover.The present invention is positioned by rack, is coaxially positioned, is installed to the components of electric mover, stator and other cooperatings, ensure that the air gap between stator and mover, realizes 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 provided convenience for production application.
Description
Technical field
The present invention relates to reciprocating pump fields, more particularly to a kind of linear motor plunger pump.
Background technique
The reciprocating pump of linear motor driving should be promoted and applied comprehensively with its exclusive advantage, but actually straight
But there are many defects in the application example of line motor reciprocating pump.In addition to high thrust linear motor itself manufactures and designs the difficulty of aspect
Except, linear motor moves back and forth after mover and reciprocal pump plunger (piston) link together, there is linear motor rotor with
Air gap between stator is difficult to the problem of reliably guaranteeing, meanwhile, it is also generally existing due to plunger (piston) gravity, frictional force, it is special
It is not that the mechanical resistance that eccentric wear generates causes linear motor staring torque excessive and straight line motor reciprocative pump vibration-direction
Phenomena such as overall dimensions are excessive, install and use inconvenience.
China Patent No. 201320628111 is disclosed " linear motor drives bidirectional reciprocating pump ", the patent No.
200620033246 disclosed " double-acting multi-cylinder reciprocating pumps of linear motor driving " etc., all do not solve the above problems, attached
Linear motor is simply moved back and forth mover in figure to be made of one with piston, it is actually not so simple, because past
The thrust needed when multiple pump work is bigger, has from 10000N to 500000N, general common thrust be 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 moves back and forth
The outer diameter of mover is with regard to big.And reciprocating pump is mainly used in high-pressure low-flow field, true upper plug (piston) diameter is greater than straight line
Electric mover outer diameter it is seldom, that is to say, that linear motor rotor and plunger (piston) are linked into sealed letter body (cylinder
Set) a possibility that very little, after entering reciprocating pump hydraulic-end more important is linear motor rotor, pumped medium is possible to flow into dynamic
Sublist face enters the trouble free service that air gap will affect motor.
China Patent No. 2016109969611 disclosed " one kind do more physical exercises unit straight line motor drive type plunger pump " is clear
It elaborates, linear motor and cylinder body can carry out transverse shifting along pedestal, to facilitate the concentricity between adjustment components；Straight-line electric
The end face ball bearing connected between machine and plunger small range can also twist in space, make directly to drive pumping system in little deviation range
It is interior to have the function of Self-aligning.But adjust components concentricity in practice it is unreliable also it is difficult to ensure that.Rely on linear motor with
The end face ball bearing connected between plunger small range in space twists, but as long as having twisting just to have dislocation, then linear motor
The air gap of mover and stator is difficult to guarantee, while apparent this straight line motor drive type plunger pump vibration-direction is whole
Size is very long.
Therefore, how to change the too long status of straight line motor reciprocative pump axial dimension, while in linear motor rotor and column
Effectively guarantee the air gap 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.
Summary of the invention
The object of the present invention is to provide a kind of linear motor plunger pumps to be changed with solving the above-mentioned problems of the prior art
Become the too long status of straight line motor reciprocative pump axial dimension, while the air gap between linear motor rotor and stator be effectively ensured,
Keep motor operation safer.
To achieve the above object, the present invention provides following schemes: the present invention provides a kind of linear motor plunger pump, including
Rack, the stator being set in the rack, mover, the first plunger, the second plunger and first pump housing being connected with the rack,
Second pump housing, the stator are coaxially set in outside the mover, have gap between the stator and the mover, described dynamic
Son is hollow structure and has 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 set 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 set to second volume
Intracavitary, the other end of second plunger is fixed on second pump housing, the axis of first plunger, second plunger
It is overlapped with the axis of the mover, is respectively provided with seal assembly 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 runner are 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 further includes positioning sleeve and end cap, the positioning sleeve, the end cap quantity be
Two, two positioning sleeves pass through the both ends that the mover is respectively arranged at the stator, and the support ring passes through described dynamic
It is sub to be connect with the rack 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 further includes back-up roller wheel component, and the back-up roller wheel component includes bracket and institute
The idler wheel stating the connected shaft of bracket and being installed in the shaft, the axis of the shaft is vertical with the axis of the mover,
The bracket is fixed on the rack, and the top of the idler wheel is contacted with the mover, between the idler wheel and the shaft
Install bearing additional.
Preferably, between first pump housing and first plunger, between second pump housing and second plunger
It is respectively provided with sealing ring, first pump housing and second pump housing are connected by screw bolts with the rack respectively.
The present invention achieves following technical effect compared with the existing technology: linear motor plunger pump provided by the invention, leads to
Rack positioning is crossed, the components of electric mover, stator and other cooperatings are coaxially positioned, are installed, it is fixed to ensure that
Air gap between son and mover, realizes the safe and reliable operation of linear motor pumps；Meanwhile using the mover of hollow structure be it is past
Multiple movement provides variable cavity volume, substantially reduces the size of linear motor plunger pump, provides convenience for production application.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without any creative labor, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the structural schematic diagram of linear motor plunger pump of the present invention；
Fig. 2 is the structure enlargement diagram of back-up roller wheel component of the present invention；
Fig. 3 is the structure enlargement diagram of seal assembly component of the present invention；
Wherein, 1 is rack, 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 runner, 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 retaining ring, 12 be back-up roller wheel component, and 1201 be bracket, and 1202 be shaft, and 1203 be idler wheel, and 13 be sealing ring.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The object of the present invention is to provide a kind of linear motor plunger pumps to be changed with solving the above-mentioned problems of the prior art
Become the too long status of straight line motor reciprocative pump axial dimension, while the air gap between linear motor rotor and stator be effectively ensured,
Keep motor operation safer.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
Fig. 1 to Fig. 3 is please referred to, Fig. 1 is the structural schematic diagram of linear motor plunger pump of the present invention, and Fig. 2 is present invention support
The structure enlargement diagram of roll wheel assembly, Fig. 3 are the structure enlargement diagram of seal assembly component of the present invention.
The present invention provides a kind of linear motor plunger pump, including rack 1, the stator being set in rack 12, mover 3,
One plunger 4, the second plunger 5 and first pump housing 6 being connected with rack 1, second pump housing 7, stator 2 are coaxially set in outside mover 3,
There is gap between stator 2 and mover 3, mover 3 is hollow structure and has the first cavity volume 301 and the second cavity volume 302, the
One cavity volume 301 is connected with first pump housing 6, and one end of the first plunger 4 is set in the first cavity volume 302, the first plunger 4
The other end is fixed on first pump housing 6, and the second cavity volume 302 is connected with second pump housing 7, and one end of the second plunger 5 is set to
In second cavity volume 302, the other end of the second plunger 5 is fixed on second pump housing 7, the axis of the first plunger 4, the second plunger 5
It is overlapped with the axis of mover 3, is respectively provided with seal assembly 8 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 is logical
The sucking valve group for crossing first pump housing 6 enters in the first cavity volume 301, at this point, the volume of the second cavity volume 302 gradually becomes smaller, 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.
It is positioned in the present invention by rack 1, the mover 3 of motor, stator 2 and the first plunger 4, the second plunger 5 is carried out
Coaxial positioning, installation, ensure 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 simultaneously, using the mover 3 of hollow structure to move back and forth, and substantially reduces linear motor plunger pump
Size, provide convenience for production application, meanwhile, continuous media flow in the first cavity volume 301, the second cavity volume 302
The heat for having taken away motor generation, improves the safety of motor operation.
Specifically, the first plunger 4, the second plunger 5 are hollow structure, and the first plunger 4 has a first runner 401, and 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 runner 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 further includes positioning sleeve 9 and end cap 10, positioning sleeve 9, end cap 10 quantity be two, positioning
Set 9 passes through the left and right ends that mover 3 is respectively arranged at stator 2, and end cap 10 passes through mover 3 and connect with rack 1 and press 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 passes through mover 3 as its guiding
Meanwhile positioning sleeve 9 is matched with the stepped hole being set in rack 1, so that the installation of stator 2, positioning 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
While 3 guiding avoid mover 3 from deflection or eccentric wear occur, certain lubrication is provided for mover 3.
More specifically, dust slinger 11 is arranged between end cap 10 and mover 3.The setting of dust slinger 11 can effectively hinder
Gear introduced contaminants enter the air gap between stator 2 and mover 3, impact to the work of linear motor plunger pump.
Linear motor plunger pump further includes back-up roller wheel component 12, and back-up roller wheel component includes bracket 1201 and bracket
1201 connected shafts 1202 and the idler wheel 1203 being installed in shaft 1202, the axis of shaft 1202 and the axis of mover 3 hang down
Directly, bracket 1201 is fixed in rack 1, and the top of idler wheel 1203 is contacted with mover, is installed additional between idler wheel 1203 and shaft 1202
Bearing.Back-up roller wheel component 12 is fixed in rack 1, is in rolling contact between top and mover 3, prevents mover 3 due under self weight
It is heavy and cause the air gap between stator 2 and mover 3 that can not ensure, or occur destroying the first cavity volume 301 and the first plunger 4,
Between second cavity volume 302 and the second plunger 5 the problems such as sealing performance, worked normally so that influencing linear motor plunger pump.
Further, bracket 1201 has U-lag, is provided with the protrusion matched with U-lag, bracket in shaft 1202
1201 be H-shaped structure, and the bottom of U-lag opens up tapped through hole, and studs is arranged in tapped through hole and is fixed with stop nut.
Referring to FIG. 2, bracket 1201 opens up U-lag, the protrusion matched with U-lag is set in shaft 1202, installation positioning facilitates,
Fast, the bottom of U-lag opens up tapped through hole, and studs is arranged in tapped through hole, in installation, debugging linear motor plunger pump
During, the studs in threaded hole is adjusted, that is, can reach correction, fine tuning mover 3 is allowed to floating mount in stator 2
Purpose, while guaranteeing the air gap between mover 3 and stator 2.For example hydraulic, starting of other adjustment modes etc. can also 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 both ends of end cap 10, support
Roll wheel assembly 12 is less than the half of 3 movement travel of mover at a distance from the middle line of mover 3, and back-up roller wheel is determined by calculation
The installation site of component 12, it is ensured that it plays a role and will not interfere with the movement of mover 3, in other embodiments of the 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, is filled out
Material 802, preloading spring 803 are set between guide sleeve 801, and gland 804 is threadedly coupled with mover 3 and compresses guide sleeve 801,
In this embodiment, guide sleeve 801 is annular, and the two groups of guide sleeves 801 contacted with preloading spring 803, which have, to be consolidated
Fixed 803 groove of preloading spring, referring to FIG. 3, guide sleeve 801 can also be using fixed in other embodiments of the invention
The forms such as position hole are matched with preloading spring 803.Due to being inconvenient to adjust the elastic of seal assembly 8 in the reciprocating motion of mover 3
Degree needs shutdown adjustment when if there is sealing leak, preloading spring 803 is arranged in seal assembly 8 of the invention, in straight-line electric
The elastic force of preloading spring 803 and the pressure of discharge is relied on voluntarily to adjust the elastic of seal assembly 8 during column plug pump work
Degree, to realize reliable sealing.
Between first pump housing 6 and the first plunger 4, it is respectively provided with sealing ring 13 between second pump housing 7 and the second plunger 5, first
The pump housing 6 and second pump housing 7 are connected by screw bolts with rack 1 respectively.
At work, mover 3 moves right linear motor plunger pump of the invention, and the volume of the first cavity volume 301 is gradually
Becoming larger, for medium by the sucking valve group in first pump housing 6, the first runner 401 through the first plunger 4 enters the first cavity volume 301,
Seal assembly 8 automatic-sealed, medium under the action of sealing preloading spring 803 are inhaled into, at the same time, the second cavity volume 302
Volume gradually becomes smaller, and the seal assembly 8 between the second cavity volume 302 and the second plunger 5 is in preloading spring 803 and discharge pressure
Automatic-sealed under the collective effect of power, the medium in the second cavity volume 302 pass through the pump housing through the second flow channel 501 of the second plunger 5
Interior discharge valve group is discharged.Such left and right reciprocation cycle, realizes the function of reciprocating pump.
Coaxial location hole in rack 1 be effectively guaranteed when manufacturing and designing installation linear motor stator electric 2 and mover 3 it
Between air gap, also set up the plunger mounting hole coaxial with 2 mounting hole of stator in rack 1, the first plunger 4, second be effectively ensured
Plunger 5 and mover 3 are coaxial, avoid the influence of the first plunger 4, the second plunger 5 to the air gap between stator 2 and mover 3, installation
Back-up roller wheel component 12 in 3 downside of mover solves the problems, such as mover 3 since self weight is sunk, while also ensuring mover 7
First cavity volume 301, the second cavity volume 302 are moved back and forth with seal assembly 8 and sealing reliability, it is ensured that the property of plunger pump
Energy and service life.
Specific examples are applied in the present invention, and principle and implementation of the present invention are described, above embodiments
Illustrate to be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art, according to
According to thought of the invention, there will be changes in the specific implementation manner and application range.In conclusion the content of the present specification
It should not be construed as limiting the invention.
Claims (6)
1. a kind of linear motor plunger pump characterized by comprising rack, the stator being set in the rack, mover,
One plunger, the second plunger and first pump housing being connected with the rack, second pump housing, the stator are coaxially set in the mover
Outside, has gap between the stator and the mover, the mover is hollow structure and has the first cavity volume and second
Cavity volume, first cavity volume are connected with first pump housing, and one end of first plunger is set to described first and holds
Product is intracavitary, and the other end of first plunger is fixed on first pump housing, second cavity volume and second pump housing
It is connected, one end of second plunger is set in second cavity volume, and the other end of second plunger is fixed on institute
State on second pump housing, first plunger, second plunger axis be overlapped with the axis of the mover, first column
Seal assembly is respectively provided between plug, second plunger and the mover；
Back-up roller wheel component, the back-up roller wheel component include bracket, the shaft being connected with the bracket and are installed on described turn
Idler wheel on axis, the axis of the shaft is vertical with the axis of the mover, and the bracket is fixed on the rack, the rolling
The top of wheel is contacted with the mover, installs bearing additional between the idler wheel and the shaft.
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 runner, and the first runner is connected with first pump housing, and described the
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: it further include positioning sleeve and end cap, it is described fixed
Position covers, the quantity of the end cap is two, and two positioning sleeves pass through the mover and are respectively arranged at the two of the stator
End, the end cap pass through the mover and connect with the rack and compress the positioning sleeve.
4. linear motor plunger pump according to claim 3, it is characterised in that: the positioning sleeve is using Porous and profit
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: be arranged 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 rack.
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 CN106996361A (en) | 2017-08-01 |
| CN106996361B true CN106996361B (en) | 2019-01-18 |
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ID=59435189
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| 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 |
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| CN (1) | CN106996361B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Citations (5)
| 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 |
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| Publication number | Publication date |
|---|---|
| CN106996361A (en) | 2017-08-01 |
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