CN106762614A - A kind of oil well recovers the oil and lifts double-acting vane pump - Google Patents

A kind of oil well recovers the oil and lifts double-acting vane pump Download PDF

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Publication number
CN106762614A
CN106762614A CN201710032792.4A CN201710032792A CN106762614A CN 106762614 A CN106762614 A CN 106762614A CN 201710032792 A CN201710032792 A CN 201710032792A CN 106762614 A CN106762614 A CN 106762614A
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CN
China
Prior art keywords
oil
blade
main shaft
rotor
recovers
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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
Application number
CN201710032792.4A
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Chinese (zh)
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CN106762614B (en
Inventor
王金强
张明亮
雷德荣
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Dandong Natai Petroleum Machinery Co Ltd
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Dandong Natai Petroleum Machinery Co Ltd
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Priority to CN201710032792.4A priority Critical patent/CN106762614B/en
Publication of CN106762614A publication Critical patent/CN106762614A/en
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Publication of CN106762614B publication Critical patent/CN106762614B/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00Rotary-piston machines or pumps
    • F04C2/30Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C2/34Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
    • F04C2/344Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • F04C2/3446Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the inner and outer member being in contact along more than one line or surface
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C13/00Adaptations of machines or pumps for special use, e.g. for extremely high pressures
    • F04C13/001Pumps for particular liquids
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C13/00Adaptations of machines or pumps for special use, e.g. for extremely high pressures
    • F04C13/008Pumps for submersible use, i.e. down-hole pumping

Abstract

The present invention relates to oil well oil recovery lifting equipment, specifically a kind of oil well recovers the oil and lifts double-acting vane pump.Including main shaft, the pump housing, overhead cam, rotor, stator, lower cam and blade, wherein main shaft is arranged in the pump housing by upper bearing (metal) part and lower bearing part, stator is fixedly connected with the pump housing, rotor is sheathed on main shaft, and annular space is formed between stator, the diameter both sides of annular space one are equipped with low pressure oil suction area and high pressure oil extraction area, the excircle of rotor is provided with multiple blade grooves, a blade is inserted with each blade groove, the bottom of each blade groove connects with the oil-out being arranged on upper bearing (metal) part, overhead cam and lower cam sleeve are on main shaft, and be fixedly connected with upper bearing (metal) part and lower bearing part respectively;Each blade is abutted under the promotion by overhead cam and lower cam or the hydraulic oil for entering blade trench bottom with the inwall of stator.High temperature oil recovery of the present invention does not carry pump and can save well workover time and expense with continuous gas injection, improves oil recovery efficiency.

Description

A kind of oil well recovers the oil and lifts double-acting vane pump
Technical field
The present invention relates to oil well oil recovery lifting equipment, specifically a kind of oil well recovers the oil and lifts double acting leaf Piece pump.
Background technology
At present, domestic and international oil recovery lifting equipment still carry over the reciprocating oil pump for using the end of the seventies, accounts for lifting and recovers the oil The 80% of equipment total amount, possesses more than 100 years history, and the huge oil pumper in bottom surface accounts for floor space greatly, and reciprocating oil pump receives structure system About, bear alternate load, mechanical loss is big, and efficiency is low, handled up well, especially injection thermal recovery gas for viscous crude, solidifying oil high thermal recovery Lock is serious, it is impossible to normal work.High-temperature oil well sucker rod is heated, and nature elongation is big, and the efficiency of pump is very low.Screw pump has been applied More than 40 years, account for oil production equipment total amount 10% once, can't be used in viscous crude, solidifying oil heat high handle up well so far, it is believed that spiral shell Bar pump stator is elastomeric material, non-refractory, can only 85 degree once application effect preferably, using narrow range, for containing sand Big oil well screw rod serious wear, short life.Centrifugation oil-immersed pump is mainly to be applied on huge discharge thin oil well, it is impossible to lift viscous crude, One-time investment is big, is difficult spread.
The content of the invention
Regarding to the issue above, recovered the oil it is an object of the invention to provide a kind of oil well and lift double-acting vane pump.
To achieve these goals, the present invention uses following technical scheme:
A kind of oil well recovers the oil lifting double-acting vane pump, including main shaft, the pump housing, overhead cam, rotor, stator, under it is convex Wheel and blade, wherein main shaft are arranged in the pump housing by upper bearing (metal) part and lower bearing part, the stator and the pump housing Inwall is fixedly connected, and the rotor is sheathed on the main shaft and annular space is formed between the stator, and the annular space is always Footpath both sides are equipped with low pressure oil suction area and high pressure oil extraction area, and the excircle of the rotor is provided with multiple blade grooves, each blade groove A blade is inside inserted with, the bottom of each blade groove connects with the oil-out being arranged on the upper bearing (metal) part, described convex Wheel and lower cam sleeve are fixedly connected on the main shaft and respectively with the upper bearing (metal) part and the lower bearing part;Respectively With the stator under the promotion that the blade passes through the overhead cam and lower cam or the hydraulic oil for entering the blade trench bottom Inwall abut.
The blade groove is radially opened on the excircle of the rotor, and the blade can be along footpath in the blade groove To movement.
The upper bearing (metal) part includes upper sliding bearing and top chock, and the top chock connects with the inwall of the pump housing Connect, the upper sliding bearing is sleeved on the main shaft and is connected with the top chock, and the top chock is provided with out liquid Mouthful, the overhead cam is fixedly connected with the top chock.
The top chock is provided with the high pressure fuel feed hole connected with the liquid outlet and the blade trench bottom.
The two ends of the rotor are provided with Inner seams, the Inner seams gap of the overhead cam and lower cam and the two ends of rotor Coordinate.
The anti-attrition part above the upper sliding bearing is provided between the top chock and the main shaft.
The anti-attrition part includes anti-attrition gland, upper anti-wear gasket and lower anti-wear gasket, wherein upper anti-wear gasket and lower anti-attrition cushion cover The both sides of the shaft shoulder that the main shaft is provided with are located on the main shaft and respectively, the anti-attrition gland is arranged on described The top of anti-wear gasket and it is fixedly connected with the top chock.
The excircle of the rotor is provided with multiple sediment outflow grooves, each sediment outflow groove be located at respectively the two neighboring blade groove it Between.
The lower bearing part includes step and properties of journal bearing lubricated, and the step is supported with the inwall of the pump housing Connect, the properties of journal bearing lubricated is sleeved on the main shaft and is connected with the step, and the step is provided with feed liquor Mouthful, the lower cam is connected with the step.
Two low pressure oil suction areas of one diameter both sides of the annular space are symmetrical arranged, two high pressure oil extraction areas pair Claim to set.
Advantages of the present invention and beneficial effect are:
1. the present invention recovers the oil lifting vane pump by the rotation oil recovery of well head drive shaft, and the work for overcoming rod string is shunk The efficiency of caused oil well pump is low, efficiency high of the present invention, than rod-pumped well economize on electricity about 40-50%.
2. the present invention recovers the oil lifting vane pump using all-metal material manufacture, can lift thin oil, viscous crude, solidifying oil high etc., Wide using scope, maximum temperature is up to 350 degree.
3. high temperature oil recovery of the present invention does not carry pump and can save well workover time and expense with continuous gas injection, improves oil recovery efficiency, subtracts Few labor strength.
4. the present invention recovers the oil and lifts vane pump, and blade realizes work by hydraulic action, reciprocating motion, high temperature is recovered the oil and is contained Gas and oil well not gas lock.
5. the present invention recovers the oil and lifts vane pump, and blade realizes work by hydraulic action, reciprocating motion, to well containing sand oil not Sensitivity, equipped with rotation sand device under pump, pump abrasion is small.
6. the present invention recovers the oil and lifts vane pump, and rotating motion part is that gap coordinates, and smooth running, the efficiency of pump is high, is past Multiple oil well pump economize on electricity 40%-50%.
7th, the present invention recovers the oil lifting vane pump, is double-acting pump, and pump rotates one and encloses oil suction twice, oil extraction twice, with nonoculture Contrasted with pump blade pump, double-acting pump does not have radial load, reduce sliding bearing abrasion, pump long service life.
Brief description of the drawings
Fig. 1 is structural representation of the invention;
Fig. 2 is the A-A sectional views of Fig. 1;
Fig. 3 is the structural representation of rotor in the present invention;
Fig. 4 is the B-B sectional views of Fig. 3.
Wherein:1 is main shaft, and 2 is trip bolt, and 3 is the pump housing, and 4 is trip bolt, and 5 is anti-attrition gland, and 6 is clamp nut, 7 is upper anti-wear gasket, and 8 is lower anti-wear gasket, and 9 is trip bolt, and 10 is upper sliding bearing, and 11 is top chock, and 12 is high pressure oil-feed Hole, 13 is overhead cam, and 14 is flat key, and 15 is rotor, and 16 is stator, and 17 is lower cam, and 18 is step, and 19 is downslide moving axis Hold, 20 is trip bolt, and 21 is hole back-up ring, and 22 is intermediate connecting sleeve, and 23 is fixed flat key, and 24 is blade, and 25 is fixed for cam Position pin, 26 is liquid outlet, and 27 is inlet, and 28 is sediment outflow groove, and 29 is blade groove, and 30 is Inner seams, and N is low pressure oil suction area, and M is High pressure oil extraction area.
Specific embodiment
In order that the object, technical solutions and advantages of the present invention are clearer, below in conjunction with the accompanying drawings with specific embodiment pair The present invention is described in detail.
As Figure 1-4, a kind of oil well that the present invention is provided recovers the oil and lifts double-acting vane pump, including main shaft 1, pump Body 3, overhead cam 13, rotor 15, stator 16, lower cam 17 and blade 24, wherein main shaft 1 pass through upper bearing (metal) part and bearing portions Part be arranged on the pump housing 3 in, stator 16 is fixedly connected with the inwall of the pump housing 3, rotor 15 be sheathed on main shaft 1 and with stator 16 it Between form annular space, a diameter both sides of annular space are equipped with low pressure oil suction area N and high pressure oil extraction area M, are set on the excircle of rotor 15 Have multiple blade grooves 29, be inserted with a blade 24 in each blade groove 29, the bottom of each blade groove 29 be arranged at upper bearing portion Oil-out 26 on part is connected.Overhead cam 13 and lower cam 17 be sheathed on main shaft 1 and respectively with upper bearing (metal) part and lower bearing Part is fixedly connected;Under promotion of each blade 24 by overhead cam 13 and lower cam 17 or the hydraulic oil for entering the bottom of blade groove 29 Inwall with stator 16 is abutted.
Blade groove 29 is radially opened on the excircle of rotor 15, and blade 24 can be moved radially in blade groove 29. Further, the excircle of rotor 15 is provided with multiple sediment outflow grooves 28, and each sediment outflow groove 28 is located at two neighboring blade groove 29 respectively Between.
As shown in Figure 3.
The upper bearing (metal) part includes upper sliding bearing 10 and top chock 11, and top chock 11 connects with the inwall of the pump housing 3 Connect, upper sliding bearing 10 is sleeved on main shaft 1 and is connected with top chock 11, two is arranged with top chock 11 and goes out liquid Mouth 26, overhead cam 13 is fixedly connected with top chock 11.
Top chock 11 is provided with the high pressure fuel feed hole 12 connected with liquid outlet 26 and the bottom of blade groove 29.The two of rotor 15 End is provided with Inner seams 30, and overhead cam 13 and lower cam 17 coordinate with the gap of Inner seams 30 at the two ends of rotor 15.
The anti-attrition part positioned at the top of upper sliding bearing 10 is provided between top chock 11 and main shaft 1.The anti-attrition part Including anti-attrition gland 5, upper anti-wear gasket 7 and lower anti-wear gasket 8, wherein upper anti-wear gasket 7 and lower anti-wear gasket 8 are sheathed on main shaft 1 and divide Not Wei Yu the both sides of the shaft shoulder that are provided with of main shaft 1, anti-attrition gland 5 is arranged at the top of anti-wear gasket 7 and solid with top chock 11 Fixed connection.
The lower bearing part includes step 18 and properties of journal bearing lubricated 19, and step 18 is supported with the inwall of the pump housing 3 Connect, properties of journal bearing lubricated 19 is sleeved on main shaft 1 and is connected with step 18, and two feed liquors are arranged with step 18 Mouth 27, lower cam 17 is connected with step 18.
Two low pressure oil suction area N of one diameter both sides of annular space are symmetrical arranged, and two high pressure oil extraction area M are symmetrical arranged.Two Individual inlet 27 is corresponding with two low pressure oil suction area N respectively, and two liquid outlets 26 are relative with two high pressure oil extraction area M respectively Should.
Operation principle of the invention is:
The double acting oil recovery vane pump that the present invention is provided, the rotation of main shaft 1 is turned clockwise by the rotor driven 15 of flat key 14, In the presence of by the hydraulic pressure of the two ends overhead cam 13 of rotor 15, lower cam 17 and the bottom of blade 24, blade 24 is all the time for blade 24 It is close on the inner surface of stator 16 and slides, it is low pressure oil suction area N that rotor 15 goes to 90 degree from 0 degree, and liquid is from step 18 On inlet 27 enter in pump chamber.Rotor 15 goes to 180 degree from 90 degree for high pressure oil extraction area M, and liquid is from top chock 11 Liquid outlet 26 enter oil pipe in.Rotor 15 goes to 270 degree for another low pressure oil suction area N from 180 degree, and liquid is from step 18 On another inlet 27 enter in pump chamber.Rotor 15 goes to 360 degree from 270 degree for another high pressure oil extraction area M, and liquid is from upper axle Another liquid outlet 26 in bearing 11 enters in oil pipe.Rotor every revolution, forms oil suction twice, and oil extraction twice, pump is continuously transported Turn, the continuous oil suctions of low pressure oil suction area N, the continuous oil extractions of high pressure oil extraction area M, liquid in oil well is lifted from the space of oil pipe and sucker rod It is raised in ground metering station.
, according to oil well depth, lifting liquid height is different, and produced pressure is different, vane pump for double-acting pump of the invention Can be used with series multistage, improve lift-off pressures, reduce pump abrasion, extend pump service life.
When vane pump plural serial stage is combined, every grade of outer casing screw connection of pump is radially fixed, and spline housing is used between each axle Connection.
The oil recovery lifting double-acting vane pump that the present invention is provided, is all-metal material manufacture, well head drive shaft rotation fortune It is dynamic, it is applicable thin oil, viscous crude, solidifying oil high and high temperature and handles up well, maximum temperature is up to 350 degree.Blade can be in pump work chamber internal diameter To reciprocating motion, automatic compensation, long service life contains gas well not gas lock, gap width reasonable in design, smooth running, pump in high temperature Efficiency high, is domestic and international optimal lifting oil production equipment at present than reciprocating oil pump economize on electricity 40%-50%.
Embodiments of the present invention are the foregoing is only, is not intended to limit the scope of the present invention.It is all in the present invention Spirit and principle within any modification, equivalent substitution and improvements, the extension made etc., be all contained in protection scope of the present invention It is interior.

Claims (10)

1. a kind of oil well recovers the oil and lifts double-acting vane pump, it is characterised in that including main shaft (1), the pump housing (3), overhead cam (13), rotor (15), stator (16), lower cam (17) and blade (24), wherein main shaft (1) is by upper bearing (metal) part and lower bearing Part is arranged in the pump housing (3), and the stator (16) is fixedly connected with the inwall of the pump housing (3), and the rotor (15) is arranged In annular space is formed on the main shaft (1) and between the stator (16), a diameter both sides of the annular space are equipped with low pressure suction Oily area (N) and high pressure oil extraction area (M), the excircle of the rotor (15) are provided with multiple blade grooves (29), each blade groove (29) A blade (24) is inside inserted with, the bottom of each blade groove (29) is with the oil-out (26) being arranged on the upper bearing (metal) part even It is logical, the overhead cam (13) and lower cam (17) be sheathed on the main shaft (1) and respectively with the upper bearing (metal) part and described Lower bearing part is fixedly connected;Each blade (24) is by the overhead cam (13) and lower cam (17) or enters the blade Abutted with the inwall of the stator (16) under the promotion of the hydraulic oil of groove (29) bottom.
2. oil well according to claim 1 recovers the oil and lifts double-acting vane pump, it is characterised in that the blade groove (29) radially it is opened on the excircle of the rotor (15), the blade (24) can be radially in the blade groove (29) It is mobile.
3. oil well according to claim 1 recovers the oil and lifts double-acting vane pump, it is characterised in that the upper bearing portion Part includes upper sliding bearing (10) and top chock (11), and the top chock (11) is connected with the inwall of the pump housing (3), institute State sliding bearing (10) to be sleeved on the main shaft (1) and be connected with the top chock (11), the top chock (11) Liquid outlet (26) is provided with, the overhead cam (13) is fixedly connected with the top chock (11).
4. oil well according to claim 3 recovers the oil and lifts double-acting vane pump, it is characterised in that the top chock (11) it is provided with the high pressure fuel feed hole (12) connected with the liquid outlet (26) and the blade groove (29) bottom.
5. oil well according to claim 4 recovers the oil and lifts double-acting vane pump, it is characterised in that the rotor (15) Two ends be provided with inner stopper (30), the inner stopper (30) at the overhead cam (13) and lower cam (17) and the rotor (15) two ends Gap coordinates.
6. oil well according to claim 3 recovers the oil and lifts double-acting vane pump, it is characterised in that the top chock (11) the anti-attrition part above the upper sliding bearing (10) is provided between the main shaft (1).
7. oil well according to claim 6 recovers the oil and lifts double-acting vane pump, it is characterised in that the anti-attrition part Including anti-attrition gland (5), upper anti-wear gasket (7) and lower anti-wear gasket (8), wherein upper anti-wear gasket (7) and lower anti-wear gasket (8) are sheathed on institute The both sides for being located at the shaft shoulder that the main shaft (1) is provided with main shaft (1) and respectively are stated, the anti-attrition gland (5) is arranged at described The top of upper anti-wear gasket (7) and it is fixedly connected with the top chock (11).
8. oil well according to claim 1 recovers the oil and lifts double-acting vane pump, it is characterised in that the rotor (15) Excircle be provided with multiple sediment outflow grooves (28), each sediment outflow groove (28) is located between the two neighboring blade groove (29) respectively.
9. oil well according to claim 1 recovers the oil and lifts double-acting vane pump, it is characterised in that the bearing portions Part includes step (18) and properties of journal bearing lubricated (19), and the step (18) abuts with the inwall of the pump housing (3), institute State properties of journal bearing lubricated (19) to be sleeved on the main shaft (1) and be connected with the step (18), the step (18) Inlet (27) is provided with, the lower cam (17) is connected with the step (18).
10. oil well according to claim 1 recovers the oil and lifts double-acting vane pump, it is characterised in that the annular space Two low pressure oil suction areas (N) of one diameter both sides are symmetrical arranged, and two high pressure oil extraction areas (M) are symmetrical arranged.
CN201710032792.4A 2017-01-16 2017-01-16 A kind of oil well oil recovery lifting double-acting vane pump Active CN106762614B (en)

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Application Number Priority Date Filing Date Title
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CN106762614B CN106762614B (en) 2018-11-13

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111720306A (en) * 2020-06-30 2020-09-29 丹东纳泰石油机械有限公司 Double-acting vane pump

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CN2589693Y (en) * 2002-03-04 2003-12-03 杨林荣 High-performance reciprocating rotor thick oil pump
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CN102072149A (en) * 2009-11-25 2011-05-25 日立汽车系统株式会社 Variable displacement pump
CN102536807A (en) * 2012-03-02 2012-07-04 中国石油天然气股份有限公司 Raw oil lifting system and method for conveying fluid by utilizing sliding vane pump
CN202468307U (en) * 2012-03-02 2012-10-03 中国石油天然气股份有限公司 Sliding vane pump
CN103147977A (en) * 2013-02-05 2013-06-12 中国石油天然气股份有限公司 Torsion spring vane pump for oil well lifting
US20150252803A1 (en) * 2014-03-10 2015-09-10 Hitachi Automotive Systems, Ltd. Variable displacement pump
CN105156077A (en) * 2015-10-10 2015-12-16 陈庆先 Differential step linear underground intelligent oil production device
CN206477989U (en) * 2017-01-16 2017-09-08 丹东纳泰石油机械有限公司 Oil well, which recovers the oil, lifts double-acting vane pump

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2045031U (en) * 1989-03-15 1989-09-27 浙江省仙居液压件厂 Dual-purpose variable paddle pump
CN2589693Y (en) * 2002-03-04 2003-12-03 杨林荣 High-performance reciprocating rotor thick oil pump
CN201301794Y (en) * 2008-11-06 2009-09-02 丹东一正密封有限公司 Underground vane pump oil production plant
CN102072149A (en) * 2009-11-25 2011-05-25 日立汽车系统株式会社 Variable displacement pump
CN102536807A (en) * 2012-03-02 2012-07-04 中国石油天然气股份有限公司 Raw oil lifting system and method for conveying fluid by utilizing sliding vane pump
CN202468307U (en) * 2012-03-02 2012-10-03 中国石油天然气股份有限公司 Sliding vane pump
CN103147977A (en) * 2013-02-05 2013-06-12 中国石油天然气股份有限公司 Torsion spring vane pump for oil well lifting
US20150252803A1 (en) * 2014-03-10 2015-09-10 Hitachi Automotive Systems, Ltd. Variable displacement pump
CN105156077A (en) * 2015-10-10 2015-12-16 陈庆先 Differential step linear underground intelligent oil production device
CN206477989U (en) * 2017-01-16 2017-09-08 丹东纳泰石油机械有限公司 Oil well, which recovers the oil, lifts double-acting vane pump

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111720306A (en) * 2020-06-30 2020-09-29 丹东纳泰石油机械有限公司 Double-acting vane pump

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