CN106762598A - A kind of power end of plunger pump - Google Patents
A kind of power end of plunger pump Download PDFInfo
- Publication number
- CN106762598A CN106762598A CN201611115416.3A CN201611115416A CN106762598A CN 106762598 A CN106762598 A CN 106762598A CN 201611115416 A CN201611115416 A CN 201611115416A CN 106762598 A CN106762598 A CN 106762598A
- Authority
- CN
- China
- Prior art keywords
- fuselage
- bent axle
- crosshead
- bearing
- plate
- 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
- 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
- F04B53/006—Crankshafts
-
- 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
- F04B53/14—Pistons, piston-rods or piston-rod connections
-
- 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
- F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
- F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
- Details Of Reciprocating Pumps (AREA)
Abstract
The present invention relates to a kind of power end of plunger pump, including fuselage, the bent axle in fuselage is arranged on, and the N group transmission components for diametrically reciprocating are acted by bent axle band, N groups transmission component is connected with N number of plunger of fluid end respectively, wherein N is natural number；Connected by bearing respectively between the two ends of bent axle and fuselage；It is characterized in that：It is provided with when N >=2, between bent axle and fuselage more than or equal to three less than or equal to N+1 fulcrum attachment structure, these fulcrum attachment structures include：Bearing jointing structure between crankshaft two end and fuselage, and be arranged on fuselage interior more than or equal to 1 be less than or equal to 1 bearing jointing structure between fixed support plate and bent axle of N.Compared with prior art, the advantage of the invention is that：The life-span of the mechanical coupling member between fuselage and bent axle can be effectively improved, moreover it is possible to prevent fuselage skidway hole cracking ends scared.
Description
Technical field
The present invention relates to a kind of power end of plunger pump.
Background technology
The power end of reciprocating plunger pump has generally comprised fuselage, bent axle, connecting rod, crosshead in fuselage, in
Between bar, intermediate bar couples with the plunger of fluid end, and under bent axle drive, it is past that through connecting rod, crosshead, intermediate bar drive plunger to carry out
Multiple motion；In above-mentioned attachment structure, in addition to bent axle and fuselage junction install roller bearing, between remaining friction means
Using the sliding friction structure such as tile axle sleeve.Crosshead and intermediate bar typically couples using screw thread or form of flanges, intermediate bar and
Plunger couples, and the crosshead slideway of fuselage typically uses overall column type or thin-wall cylinder casing setting type, if between many cylinder structures, cylinder
It is mutually isolated out, narrower bridge of the nose structure is left between adjacent cylinder structure.The front end face of fuselage enters with the fluid end pump housing again
Row connection.The power end of plunger pump of traditional design often deposits deficiency in the design, and generally existing efficiency is low, noise big, actual
Often occurs the heating of fuselage slideway nose end plucking in, stress concentration ftractures, and particularly the bridge of the nose is easy to crack between cylinder, intermediate bar sealing
Easy oil leak, assembling and dismounting are difficult, especially with fluid end couple corroded by scene after be difficult to dismantle, power end volume is big,
These inadequate natural endowments have impact on reciprocating plunger pump and develop to efficient, energy-conservation, lightweight.
The content of the invention
The technical problems to be solved by the invention are directed to above-mentioned prior art and provide a kind of fuselage end hair not easy to crack
The power end of plunger pump of hair.
The present invention solve the technical scheme that is used of above-mentioned technical problem for：A kind of power end of plunger pump, including fuselage, if
Put the bent axle in fuselage, and the N group transmission components diametrically reciprocated by the action of bent axle band, N groups transmission component respectively with liquid
N number of plunger connection at power end, wherein N is natural number；Connected by bearing respectively between the two ends of bent axle and fuselage；Its feature exists
In：
Two fulcrum attachment structures are provided with as N=1, between bent axle and fuselage, the two fulcrum attachment structures are respectively：
Bearing jointing structure between crankshaft two end and fuselage；
When N >=2, fuselage interior is fixed with the fixed support plate less than or equal to N-1 more than or equal to 1, and each is fixed
Supporting plate is coupled by bearing with bent axle respectively, therefore, it is provided between bent axle and fuselage more than or equal to three less than or equal to N+1 branch
Point attachment structure, these fulcrum attachment structures include：Bearing jointing structure between crankshaft two end and fuselage, and it is arranged on fuselage
The internal bearing jointing structure being less than or equal to more than or equal to 1 between N-1 fixed support plate and bent axle.
Connected by rolling bearing respectively between the two ends of the bent axle and fuselage, when the number of fixed support plate is 2
And at less than two, connected by bent axle sliding bearing between fixed support plate and the trunnion of bent axle；When fixed support plate
When number is more than three, connected by both sides sliding bearing between fixed support plate and bent axle near two the two of end pieces of fuselage
Connect, connected by middle rolling bearing between middle remaining fixed support plate and bent axle.
The bent axle is provided with fan plate round platform corresponding with fixed support plate number, each fixed support plate respectively with song
One fan plate round platform of axle is coupled by bearing.
Near the fan plate round platform of fuselage end it is cylindrical on be mounted with that two pieces are got rid of oiled-plate method, are got rid of oiled-plate method and are connected with swab case, connect
Oil box is connected with oil sump.
Waist is provided with a movement parts observation window.
The N groups transmission component structure is identical, including connecting rod and crosshead, the wherein company of the first end of connecting rod and bent axle
Bar axle journal is coupled by rolling bearing, and the second end of connecting rod couples with the first end of crosshead, the plunger and crosshead of fluid end
The second end connection.
Be provided with the guide rail hole for setting crosshead in the fuselage, guide rail hole inwall be provided with N groups it is symmetrically arranged on lead
Plate and bottom guide, crosshead are then fixed between upper guide plate and bottom guide.
The first end of the crosshead is provided with front aperture, and the microcephaly's bearing ten for installing connecting rods is provided with the emptying aperture of front end
Fixed by crosshead pin between prefix and connecting rod, two ends of crosshead pin are fixed against crosshead bearing pin using hole back-up ring
To play；Second end of the crosshead is provided with positioning round table, and hemisphere adjustment block and hemisphere adjustment are provided with positioning round table
The core-adjustable ball that block coordinates, the cylindrical of positioning round table is provided with screw thread, and the plunger of fluid end installs solid by snap ring and clamping nut
It is scheduled on the second end of crosshead positioning round table cylindrical.
Compared with prior art, the advantage of the invention is that：It is bent when power end drives two and more than two plungers
It is provided between axle and fuselage more than or equal to three less than or equal to N+1 fulcrum attachment structure, i.e. bent axle and fuselage except end two
Outside fulcrum attachment structure, fulcrum attachment structure is additionally provided between bent axle middle part and fuselage, can effectively improve fuselage with
The life-span of the mechanical coupling member between bent axle, moreover it is possible to prevent fuselage skidway hole cracking ends scared.
Brief description of the drawings
Fig. 1 is plunger pump power end structure schematic diagram in the embodiment of the present invention；
Fig. 2 is plunger pump power terminal body structure schematic diagram in the embodiment of the present invention；
Fig. 3 is another viewing angle constructions schematic diagram of power end of plunger pump in the embodiment of the present invention；
Fig. 4 is the another viewing angle constructions schematic diagram of power end of plunger pump in the embodiment of the present invention.
Specific embodiment
The present invention is described in further detail below in conjunction with accompanying drawing embodiment.
Power end of plunger pump as shown in figures 1-4, including fuselage 1, are arranged on the bent axle 2 in fuselage 1, and by the band of bent axle 2
The N group transmission components that action is diametrically reciprocated, N groups transmission component is connected with N number of plunger 10 of fluid end respectively, and wherein N is
Natural number；Connected by bearing respectively between the two ends of bent axle 2 and fuselage；
Two fulcrum attachment structures are provided with as N=1, between bent axle and fuselage, the two fulcrum attachment structures are respectively：
Bearing jointing structure between crankshaft two end and fuselage；
When N >=2, fuselage interior is fixed with the fixed support plate 22 less than or equal to N-1 more than or equal to 1, and each is consolidated
Determine supporting plate 22 to couple with bent axle by bearing respectively, therefore, it is provided between bent axle 2 and fuselage and N+ is less than or equal to more than or equal to three
1 fulcrum attachment structure, these fulcrum attachment structures include：Bearing jointing structure between crankshaft two end and fuselage, and set
In fuselage interior more than or equal to 1 less than or equal to the bearing jointing structure between N-1 fixed support plate and bent axle.Therefore, when
When power end drives more than two plungers, between bent axle 2 and fuselage, except the bearing between crankshaft two end and fuselage connects knot
Outside structure, bearing jointing structure is additionally provided between the middle part of bent axle 2 and fuselage.Bearing is set between the middle part of bent axle 2 and fuselage to connect
Binding structure, can effectively improve the life-span of the mechanical coupling member between fuselage and bent axle, moreover it is possible to prevent fuselage slideway bore ends
Cracking is scared.
Because the volume of power end of plunger pump is often huger, when power end of plunger pump needs to drive multiple plungers,
Bent axle often takes Split type structure, i.e., connect into a bent axle long by multistage bent axle, in order to eliminate the axle between split bent axle
To error, connected by rolling bearing respectively between the two ends of the bent axle and fuselage, when fixed support plate number for 2 and
At less than two, connected by bent axle sliding bearing between fixed support plate and bent axle；When the number of fixed support plate is at three
During the above, connected by both sides sliding bearing 23 between fixed support plate and bent axle near two the two of end pieces of fuselage, be in
Connected by middle rolling bearing 7 between middle remaining fixed support plate and bent axle.Therefore the branch between bent axle 2 and fuselage 1
Point attachment structure is combined using rolling bearing with sliding bearing, effectively improves mechanical efficiency and bearing pair life-span.Certainly, it is this
Mode, it is equally applicable for integral one-piece crankshaft.
As a example by below by way of N=5, power end of plunger pump structure of the invention is described in detail, the plunger pump power
End includes fuselage 1, bent axle 2, connecting rod 3, crosshead 4, upper guide plate 5, bottom guide 6, middle rolling bearing 7, the big end axis of rolling
Hold 8, even microcephaly's needle bearing 9, conjuncted plunger 10, core-adjustable ball 11, hemisphere adjustment block 12, snap ring 13, clamp nut 14, seal box
Baffle plate 15, seal box 16, crosshead pin 17, bent axle rolling bearing 18, bearing lead to lid 19, bearing boring cover 20, swab case 21, fixation
Supporting plate 22, two side sliding bearings 23 and disc 24, referring to shown in Fig. 1~3.
Fuselage 1 is five cylinder structures, has six fulcrum attachment structures between fuselage 1 and bent axle 2, respectively：Crankshaft two end
The attachment structure of bent axle rolling bearing 18 between fuselage, is arranged on 4 of fuselage interior between fixed support plate and bent axle
Bearing jointing structure, wherein passing through both sides sliding bearing 23 between fixed support plate and bent axle near two the two of end pieces of fuselage
Connection, is connected between fixed support plate and bent axle in middle two by middle rolling bearing 7.Two fixations in the middle of wherein
Between supporting plate and bent axle, rolling bearing connection is between the end of bent axle two and fuselage, the radial load moment of flexure of bent axle can be born, increased
Plus stiffness；Two auxiliary fulcrum attachment structures near the side of fuselage end two are sliding bearing, and it is split assembled to be mainly used in
Bent axle, aids in the stress moment of flexure that bent axle A, B, C, D are turned, and lowers bent axle, the stress point of fuselage, more than suitable five cylinders of spy many
Applied on cylinder pump power end.
The bent axle is provided with six fan plate round platforms, middle four fan plate round platforms respectively with four fixed support plates it
Between by bearing connect, i.e.,：The middle cylindrical upper foregoing middle rolling bearing 7 of installation of two adjacent fan plate round platforms, in centre
The cylindrical upper installation foregoing two side sliding bearing 23 of two other fan plate round platform, outside two pieces of fan plate round platforms of fuselage end
It is separately installed with circle and gets rid of oiled-plate method 24, got rid of oiled-plate method 24 and connected with swab case 21, swab case 21 is connected with oil sump.
The N groups transmission component structure is identical, including connecting rod 3 and crosshead 4, the wherein first end and bent axle of connecting rod 3
Rod journal coupled by big end rolling bearing 8, the second end of connecting rod 3 couples with the first end of crosshead 4, fluid end
Plunger 10 couple with the second end of crosshead 4.The first end of the crosshead 4 is provided with front aperture, is provided with the emptying aperture of front end
For the small end of connecting rod rolling bearing 9 of installing connecting rods 3, fixed by crosshead pin 17 between crosshead 4 and the end of connecting rod 3 second,
Two ends of crosshead pin 17 are fixed against crosshead pin axial float using hole back-up ring；Second end of crosshead is provided with fixed
Circle of position platform, is provided with the core-adjustable ball 11 that hemisphere adjustment block 12 and hemisphere adjustment block 12 coordinate, outside positioning round table in positioning round table
Circle is provided with screw thread, and the plunger 10 of fluid end is fixed on the second end of crosshead setting circle by snap ring 13 and clamping nut 14
Platform is cylindrical.
The guide rail hole for setting N number of crosshead of up/down perforation is provided with the fuselage 1, the guide rail hole is also passed through for left and right
Logical unenclosed construction, guide rail hole inwall is provided with the symmetrically arranged upper guide plate 5 of N groups and bottom guide 6, and N number of crosshead 4 is solid respectively
It is scheduled between the symmetrically arranged upper guide plate 5 of N groups and bottom guide 6, the fuselage 1 is provided with disjunctor seal box gear with fluid end intersection
Plate 15, disjunctor seal box baffle plate 15 is provided with N number of open type sealing cartridge apertures, is respectively equipped with and N number of plunger in each sealing cartridge apertures
10 seal boxes 16 for sealingly connecting；Therefore without isolation between N number of plunger.The end of crosshead second and disjunctor seal box baffle plate 15 it
Between leave gap window 25 for plunger 10, hemisphere adjustment block 12, core-adjustable ball 11, snap ring 13 and clamping nut 14；Waist
It is provided with a movement parts observation window 27.
Compared with prior art, its advantage is the power end of plunger pump that the present embodiment is provided：
1st, the fuselage of Five-cylinder piston pump power end uses six fulcrum attachment structures, using rolling bearing and sliding bearing phase
With reference to, it is adaptable to split bent axle, the sliding friction for changing conventional Five-cylinder piston pump becomes rolling friction, effectively improves mechanical efficiency
And the bearing pair life-span；
2nd, between the crosshead and guide rail hole of fuselage, between crosshead and seal box, fuselage and the pump housing are fitted and connected place
Unenclosed construction is used, mutually without isolation between cylinder, the bridge of the nose in cancelling between original structure fuselage cylinder reduces various stress points,
The cracking for contributing to fuselage to cause due to each stress concentration；
3rd, the plunger body of fluid end is directly coupled in crosshead, reduces the middle extension bar in original structure, is so reduced
Workpiece accumulated error, improves assembly precision, shortens the length of fuselage, improves mechanical strength, the stiffness of whole pump, dismounts post
Cock body is more convenient, and reduces manufacturing cost.
Claims (8)
1. a kind of power end of plunger pump, including fuselage (1), is arranged on the bent axle (2) in fuselage (1), and acted by bent axle (2) band
The N group transmission components for diametrically reciprocating, N groups transmission component is connected with N number of plunger (10) of fluid end respectively, and wherein N is certainly
So count；Connected by bearing respectively between the two ends of bent axle (2) and fuselage；It is characterized in that：
Two fulcrum attachment structures are provided with as N=1, between bent axle and fuselage, the two fulcrum attachment structures are respectively：Bent axle
Bearing jointing structure between two ends and fuselage；
When N >=2, fuselage interior is fixed with the fixed support plate (22) less than or equal to N-1 more than or equal to 1, and each is fixed
Supporting plate (22) is coupled by bearing with bent axle respectively, therefore, bent axle (2) is provided with and fuselage between and is less than or equal to more than or equal to three
N+1 fulcrum attachment structure, these fulcrum attachment structures include：Bearing jointing structure between crankshaft two end and fuselage, and set
Put in fuselage interior more than or equal to 1 less than or equal to the bearing jointing structure between N-1 fixed support plate and bent axle.
2. power end of plunger pump according to claim 1, it is characterised in that：The two ends of the bent axle (2) and fuselage (1) it
Between respectively by bent axle rolling bearing (18) connect, when fixed support plate number be 2 and less than two when, fixed support plate
(22) it is connected by sliding bearing between bent axle (2)；When the number of fixed support plate is more than three, near two, fuselage
Two pieces of end are connected between fixed support plate and bent axle by both sides sliding bearing (23), in the middle fixed support of residue
Connected by middle rolling bearing (7) between plate and bent axle.
3. power end of plunger pump according to claim 2, it is characterised in that：The bent axle is provided with multiple fan plate circles
Platform, each fixed support plate (22) is coupled with a fan plate round platform of bent axle by bearing respectively.
4. power end of plunger pump according to claim 3, it is characterised in that：Near two pieces of fan plate round platforms of fuselage end
It is separately installed with cylindrical and gets rid of oiled-plate method (24), got rid of oiled-plate method (24) and connected with swab case (21), swab case (21) is connected with oil sump.
5. power end of plunger pump according to claim 1, it is characterised in that：Fuselage (1) middle part is provided with a movement parts
Observation window (27).
6. the power end of plunger pump according to any one claim in Claims 1 to 5, it is characterised in that：The N groups
Transmission component structure is identical, including connecting rod (3) and crosshead (4), the wherein rod journal of the first end of connecting rod (3) and bent axle
Coupled by big end rolling bearing (8), the second end of connecting rod (3) couples with the first end of crosshead (4), the post of fluid end
Plug (10) couples with the second end of crosshead (4).
7. the power end of plunger pump according to any one claim in claim 6, it is characterised in that：The fuselage
(1) be provided with guide rail hole (26) for setting crosshead in, guide rail hole (26) inwall be provided with the upper guide plate (5) that claims to set and under lead
Plate (6), crosshead (4) is then fixed between upper guide plate (5) and bottom guide (6).
8. power end of plunger pump according to claim 6, it is characterised in that：Before the first end of the crosshead (4) is provided with
Stomidium, is provided with the small end of connecting rod rolling bearing (9) for installing connecting rods (3), crosshead (4) and connecting rod (3) in the emptying aperture of front end
Between it is fixed by crosshead pin (17), two ends of crosshead pin (17) are fixed against crosshead pin axial direction using hole back-up ring
Play；Second end of the crosshead is provided with positioning round table, hemisphere adjustment block (12) is provided with positioning round table and hemisphere is adjusted
The core-adjustable ball (11) that monoblock (12) coordinates, the cylindrical of positioning round table is provided with screw thread, and the plunger (10) of fluid end is by snap ring
(13) and clamping nut (14) to be fixed on the second end of crosshead positioning round table cylindrical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611115416.3A CN106762598B (en) | 2016-12-07 | 2016-12-07 | A kind of power end of plunger pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611115416.3A CN106762598B (en) | 2016-12-07 | 2016-12-07 | A kind of power end of plunger pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106762598A true CN106762598A (en) | 2017-05-31 |
| CN106762598B CN106762598B (en) | 2019-08-13 |
Family
ID=58876976
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611115416.3A Active CN106762598B (en) | 2016-12-07 | 2016-12-07 | A kind of power end of plunger pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106762598B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108167174A (en) * | 2017-12-04 | 2018-06-15 | 北京天地玛珂电液控制系统有限公司 | A kind of branched support emulsion pump |
| CN110685881A (en) * | 2019-09-27 | 2020-01-14 | 平顶山市神马万里化工股份有限公司 | Driving device for linkage of multiple pump heads |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010042422A1 (en) * | 2000-05-18 | 2001-11-22 | Niels Kohlhase | Multiple crank drive for working machines, in particular for diaphragm pumps |
| JP2005133667A (en) * | 2003-10-31 | 2005-05-26 | Sugino Mach Ltd | High pressure plunger pump |
| CN201176911Y (en) * | 2007-11-13 | 2009-01-07 | 南京六合煤矿机械有限责任公司 | Emulsion pump suitable for down-hole of coal mine |
| CN201650711U (en) * | 2009-12-26 | 2010-11-24 | 浙江工业大学 | Reciprocating pump |
| CN206234102U (en) * | 2016-12-07 | 2017-06-09 | 宁波合力机泵股份有限公司 | A kind of power end of plunger pump |
-
2016
- 2016-12-07 CN CN201611115416.3A patent/CN106762598B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010042422A1 (en) * | 2000-05-18 | 2001-11-22 | Niels Kohlhase | Multiple crank drive for working machines, in particular for diaphragm pumps |
| JP2005133667A (en) * | 2003-10-31 | 2005-05-26 | Sugino Mach Ltd | High pressure plunger pump |
| CN201176911Y (en) * | 2007-11-13 | 2009-01-07 | 南京六合煤矿机械有限责任公司 | Emulsion pump suitable for down-hole of coal mine |
| CN201650711U (en) * | 2009-12-26 | 2010-11-24 | 浙江工业大学 | Reciprocating pump |
| CN206234102U (en) * | 2016-12-07 | 2017-06-09 | 宁波合力机泵股份有限公司 | A kind of power end of plunger pump |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108167174A (en) * | 2017-12-04 | 2018-06-15 | 北京天地玛珂电液控制系统有限公司 | A kind of branched support emulsion pump |
| CN110685881A (en) * | 2019-09-27 | 2020-01-14 | 平顶山市神马万里化工股份有限公司 | Driving device for linkage of multiple pump heads |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106762598B (en) | 2019-08-13 |
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