CN106224323A - The restructuring of a kind of many single plunger pumps controls the closed type hydraulic system of asymmetrical cylinder - Google Patents
The restructuring of a kind of many single plunger pumps controls the closed type hydraulic system of asymmetrical cylinder Download PDFInfo
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- CN106224323A CN106224323A CN201610820537.1A CN201610820537A CN106224323A CN 106224323 A CN106224323 A CN 106224323A CN 201610820537 A CN201610820537 A CN 201610820537A CN 106224323 A CN106224323 A CN 106224323A
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- fluid port
- single plunger
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/18—Combined units comprising both motor and pump
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Abstract
The restructuring of a kind of many single plunger pumps controls the closed type hydraulic system of asymmetrical cylinder, including fuel tank, hydraulic cylinder, two check valves, two relief valve with organize single plunger pump more；First oil inlet and outlet of this many groups single plunger pump is all connected with big chamber hydraulic fluid port, and the second oil inlet and outlet of two groups of single plunger pumps of at least a part of which is connected with loculus hydraulic fluid port, and the second oil inlet and outlet of the single plunger pump of remaining group connects the difference in flow with compensating hydraulic cylinder with fuel tank；The outlet of two check valves is connected with big chamber hydraulic fluid port and loculus hydraulic fluid port respectively, and the import of two check valves connects with fuel tank；The import of two relief valve is connected with big chamber hydraulic fluid port and loculus hydraulic fluid port respectively, and the outlet of two relief valve connects with fuel tank.Present configuration is simple, and reliability is high, have less output flow pressure fluctuation.
Description
Technical field
The present invention relates to hydraulic cylinder control field, the restructuring of a kind of many single plunger pumps controls closing of asymmetrical cylinder
Formula hydraulic system.
Background technology
Hydraulic drive because of have power density greatly, easily realize the advantages such as linear motion be widely used in each big industry neck
Territory.But often there is the problem of inefficiency in existing Hydraulic Power Transmission System, wherein, restriction loss is to cause hydraulic system inefficient
One of principal element.Tradition closed model pump control hydraulic system uses tradition enclosed plunger displacement pump directly to drive single executor, passes through
Control conventional variable pump delivery and rotating speed control the speed of executor.Owing to system uses volumetric void fraction to instead of throttling control
System, therefore, system throttles loss is eliminated, and then substantially increases the efficiency of system.
Pump control asymmetrical cylinder hydraulic system is always study hotspot and the difficult point place of domestic and international experts and scholars.Asymmetrical cylinder
Owing to piston two cavity area is different, cause two chamber hydraulic oil turnover flows.And driving pump used by conventional pump Ore-controlling Role is many
For tradition plunger displacement pump, tradition plunger displacement pump typically use a cylinder body in the most integrated multiple plungers, multiple plungers by cylinder body and
The frame for movements such as swash plate are coupled, it is impossible to independent control, and multiple plungers link by certain rule simultaneously, jointly complete oil suction
And oil extraction.Therefore, for ensureing effective operation of asymmetrical cylinder, extra small displacement slippage pump need to often be introduced in hydraulic system
Carry out repairing with repairing control valve, considerably increase complexity and the design difficulty of hydraulic system.
Summary of the invention
Present invention is primarily targeted at and overcome drawbacks described above of the prior art, propose a kind of simple in construction, reliability
Height, the many single plunger pumps restructuring that can improve hydraulic cylinder characteristic controls the closed type hydraulic system of asymmetrical cylinder.
The present invention adopts the following technical scheme that
The restructuring of a kind of many single plunger pumps controls the closed type hydraulic system of asymmetrical cylinder, including fuel tank and hydraulic cylinder, and should
Hydraulic cylinder is provided with big chamber hydraulic fluid port and loculus hydraulic fluid port, it is characterised in that: include two check valves, two relief valve and organize single plunger pump more；
First oil inlet and outlet of this many groups single plunger pump is all connected with big chamber hydraulic fluid port, the second turnover of two groups of single plunger pumps of at least a part of which
Hydraulic fluid port is connected with loculus hydraulic fluid port, and the second oil inlet and outlet of the single plunger pump of remaining group connects the stream with compensating hydraulic cylinder with fuel tank
It is poor to measure；The outlet of two check valves is connected with big chamber hydraulic fluid port and loculus hydraulic fluid port respectively, and the import of two check valves connects with fuel tank；Two peaces
The import of full valve is connected with big chamber hydraulic fluid port and loculus hydraulic fluid port respectively, and the outlet of two relief valve connects with fuel tank.
Preferably, described single plunger pump includes motor, drive mechanism, plunger cylinder, piston and four reversal valves；This plunger
Cylinder body is provided with four import and export；The P mouth of four reversal valves is connected with these four import and export respectively, wherein the T mouth phase of two reversal valves
Connecting and as the first oil inlet and outlet, the T mouth of other two reversal valves is connected as the second oil inlet and outlet；This piston is arranged at actively
In this plunger cylinder and it is connected with drive mechanism；This motor connects drive transmission device action and drives plunger to move.
Preferably, including four groups of single plunger pumps, the first oil inlet and outlet of these four groups of single plunger pumps is all oily with described big chamber
Mouth is connected；Wherein the second oil inlet and outlet of two groups of single plunger pumps is connected with described loculus hydraulic fluid port, remaining single plunger of two groups
Second oil inlet and outlet of pump connects with described fuel tank.
Preferably, moved right by control when described hydraulic cylinder so that big chamber hydraulic fluid port oil inlet quantity is fuel-displaced more than loculus hydraulic fluid port
Amount, then control described loculus hydraulic fluid port hydraulic oil and enter two groups of single plunger pumps of described at least a part of which through described second oil inlet and outlet, and
Big chamber hydraulic fluid port is entered by described first oil inlet and outlet；Controlling described fuel tank repairing again, this hydraulic oil is through remaining single plunger organized
Second oil inlet and outlet of pump enters remaining group single plunger pump described, and after enter big oil pocket hydraulic fluid port through described first oil inlet and outlet.
Preferably, it is moved to the left by control when described hydraulic cylinder so that big chamber hydraulic fluid port oil pump capacity is more than loculus hydraulic fluid port oil-feed
Amount, then control described big chamber hydraulic fluid port hydraulic oil and enter described organize single plunger pumps through described first oil inlet and outlet more, and after through described
Second oil inlet and outlet enters loculus hydraulic fluid port and fuel tank.
From the above-mentioned description of this invention, compared with prior art, there is advantages that
1, less output flow pressure fluctuation
The recombination structure mode that the present invention uses many group single plunger pumps in parallel drives hydraulic cylinder, between each single plunger pump not
There is mechanical couplings.By the piston of each single plunger pump is controlled according to certain movement rule, it is possible to decrease even eliminate
Flow pressure output ripple, improves the kinetic characteristic of hydraulic cylinder；
2, simple in construction, reliability is high
The hydraulic system of the present invention uses multiple asymmetrical hydraulic cylinders of single plunger pump parallel drive, wherein part single plunger
Second oil inlet and outlet of pump connects fuel tank, carries out repairing by this part single plunger pump chamber big to hydraulic cylinder hydraulic fluid port, it is no longer necessary to
Extra recharging oil device, has simple in construction, it is achieved the features such as convenience；And if when this hydraulic system there being single plunger pump event occurs
Barrier, that can pass through other plunger displacement pumps reconfigures work, it is ensured that systems stay runs, and has higher reliability.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention；
Fig. 2 is single plunger pump piston motion profiles of the present invention；
Wherein: 10 is fuel tank, 20 is hydraulic cylinder, and A is big chamber hydraulic fluid port, and B is loculus hydraulic fluid port, and 30 is check valve, and 40 is safety
Valve, I are first group of single plunger pump, and II is second group of single plunger pump, and III is the 3rd group of single plunger pump, and IV is the 4th group of single plunger
Pump, 51 is motor, and 52 is drive mechanism, and 53 is plunger cylinder, and 54 is piston, and 55a is the first reversal valve, and 55b is the second commutation
Valve, 55c is the 3rd reversal valve, and 55d is the 4th reversal valve, and 56 is the first oil inlet and outlet, and 57 is the second oil inlet and outlet.
Detailed description of the invention
Below by way of detailed description of the invention, the invention will be further described.
With reference to Fig. 1, the restructuring of a kind of many single plunger pumps controls the closed type hydraulic system of asymmetrical cylinder, including fuel tank 10 He
Hydraulic cylinder 20, this hydraulic cylinder 20 is asymmetrical cylinder, and it is provided with big chamber hydraulic fluid port A and loculus hydraulic fluid port B.Also include two check valves
30, two relief valve 40 and organize single plunger pump more.First oil inlet and outlet 56 of this many groups single plunger pump is all connected with big chamber hydraulic fluid port A
Logical, the second oil inlet and outlet 57 of two groups of single plunger pumps of at least a part of which is connected with loculus hydraulic fluid port B, the of remaining single plunger pump organized
Two oil inlet and outlets 57 connect with fuel tank 10 with the difference in flow of compensating hydraulic cylinder 20；The outlet of two check valves 30 respectively with big chamber hydraulic fluid port
A is connected with loculus hydraulic fluid port B, and the import of two check valves 30 connects with fuel tank 10, and two check valves 30 are for being moved through at hydraulic cylinder 20
Journey carries out repairing when being emptied occurs in oil circuit；The import of two relief valve 40 is connected with big chamber hydraulic fluid port A and loculus hydraulic fluid port B respectively,
The outlet of two relief valve 40 connects with fuel tank 10, and two relief valve 40 are used for limiting system maximum pressure, when hydraulic system pressure is high
When safety valve setting threshold value, hydraulic oil is directly by relief valve 40 oil sump tank, thus prevents system pressure too high.
Using four groups of single plunger pumps in the present invention, often group single plunger pump includes motor 51, drive mechanism 52, plunger cylinder
53, piston 54 and four reversal valves.This plunger cylinder 53 is provided with four import and export, and two of which is imported and exported and is positioned at both sides, top,
Other two is positioned at both sides, bottom.The P mouth of four reversal valves is connected with these four import and export respectively, wherein first, second commutation
The T mouth of valve 55a, 55b is connected and as the first oil inlet and outlet 56, and the T mouth of the three, the 4th reversal valve 55c, 55d is connected and conduct
Second oil inlet and outlet 57.This piston 54 is arranged in this plunger cylinder 53 actively, and is connected with drive mechanism 52.This motor 51
Connecting drive transmission device 52 action drives the relative plunger cylinder 53 of piston 54 to move up and down.The first of these four groups of single plunger pumps enters
Oil-out 56 is the most connected, wherein second oil inlet and outlet 57 of first group of single plunger pump I and second group of single plunger pump II and loculus oil
Mouth B is connected, and second oil inlet and outlet 57 of the 3rd group of single plunger pump III and the 4th group of single plunger pump IV connects with fuel tank 10.
First group of single plunger pump I operation principle is as follows: when motor 51 drives piston 54 to move upward by drive mechanism 52
Time, if the first, the 3rd reversal valve 55a, 55c works in left station, the second, the 4th reversal valve 55b, 55d works in right working position, this
Time hydraulic oil flowed into by single plunger pump the second oil inlet and outlet 57, through the 4th reversal valve 55d flow into plunger cylinder 53 cavity of resorption, by plunger
Cylinder body 53 epicoele flows out from the first oil inlet and outlet 56 of single plunger pump through the first reversal valve 55a；When motor 51 passes through drive mechanism
When 52 drive pistons 54 move downward, if the first, the 3rd reversal valve 55a, 55c works in right working position, the second, the 4th reversal valve
55b, 55d work in left station, and now hydraulic oil is flowed into by single plunger pump the second oil inlet and outlet 57, flow through the 3rd reversal valve 55c
Enter plunger cylinder 53 epicoele, plunger cylinder 53 cavity of resorption flow out from single plunger pump the first oil inlet and outlet 56 through the second reversal valve 55b；
When motor 51 drives piston 54 to move upward by drive mechanism 52, if the first, the 3rd reversal valve 55a, 55c works in right work
Position, the second, the 4th reversal valve 55b, 55d works in left station, and now, hydraulic oil is flowed by the first oil inlet and outlet 56 of single plunger pump
Enter, flow into single plunger cylinder body 53 cavity of resorption through the second reversal valve 55b, by plunger cylinder 53 epicoele through the 3rd reversal valve 55c from single-column
Second oil inlet and outlet 57 of plug pump flows out；When motor 51 drives piston 54 to move downward by drive mechanism 52, if first, the
Three reversal valve 55a, 55c work in left station, and the second, the 4th reversal valve 55b, 55d works in right working position, now, hydraulic oil by
First oil inlet and outlet 56 of single plunger pump flows into, and flows into plunger cylinder 53 epicoele through the first reversal valve 55a, by plunger cylinder 53 times
Chamber the 4th reversal valve 55d flows out from the second oil inlet and outlet 57 of single plunger pump.
Second group of single plunger pump II, the 3rd group of single plunger pump III, the operation principle of the 4th group of single plunger pump IV and first group
The principle of single plunger pump I is identical.
During hydraulic work system, owing to 20 liang of chamber effective areas of hydraulic cylinder are different, cause big chamber hydraulic fluid port A's to enter (going out)
Oil mass compared with loculus hydraulic fluid port B to go out (entering) oil mass big.Therefore, for ensureing effective work of hydraulic cylinder 20, when hydraulic cylinder 20 is transported to the right
Time dynamic, first group of single plunger pump I and second group of single plunger pump II need to be used to be delivered to by the hydraulic oil in the loculus of hydraulic cylinder 20
The big chamber of hydraulic cylinder 20, meanwhile, also needs to use the 3rd group of single plunger pump III and the 4th group of single plunger pump IV to pass through fuel tank 10 to hydraulic pressure
The big chamber of cylinder 20 carries out repairing.When hydraulic cylinder 20 is to left movement, first group of single plunger pump I and second group of single plunger pump II is used to incite somebody to action
While section hydraulic oil in the big chamber of hydraulic cylinder 20 is delivered to hydraulic cylinder 20 loculus, also need to use the 3rd group of single plunger pump III
With the 4th group of single plunger pump IV, the raffinate force feed in big for hydraulic cylinder 20 chamber is delivered in fuel tank 10.The concrete work of this hydraulic system
Make flow process as follows:
When hydraulic cylinder 20 moves right, the big chamber hydraulic fluid port A oil inlet quantity of hydraulic cylinder 20 is more than loculus hydraulic fluid port B oil pump capacity.This
Time, the hydraulic oil in hydraulic cylinder 20 loculus flows out via loculus hydraulic fluid port B, through first group of single plunger pump I, second group of single plunger pump II
The second oil inlet and outlet 57 flow into, first oil inlet and outlet 56 of first group of single plunger pump I, second group of single plunger pump II flow out,
In the big chamber of big chamber hydraulic fluid port A influent cylinder pressure 20.Owing to the big chamber hydraulic fluid port A oil inlet quantity of hydraulic cylinder 20 goes out more than loculus hydraulic fluid port B
Oil mass, therefore, also need the 3rd group, the 4th group of single plunger pump III, IV carry out repairing, this section hydraulic oil by fuel tank 10 through the
Second oil inlet and outlet 57 of three groups, the 4th group single plunger pumps III, IV flows into, by the 3rd group, the 4th group single plunger pump III, IV
First oil inlet and outlet 56 flows out, in the big chamber of big chamber hydraulic fluid port A influent cylinder pressure 20.
When hydraulic cylinder 20 is to left movement, the big chamber hydraulic fluid port A oil pump capacity of hydraulic cylinder 20 is more than loculus hydraulic fluid port B oil inlet quantity.This
Time, the hydraulic oil in the big chamber of hydraulic cylinder 20 flows out via big chamber hydraulic fluid port A, by the first of first group, second group single plunger pump I, II
Oil inlet and outlet 56 flows into, second oil inlet and outlet 57 of single plunger pump I, II flow out, and flows into through the loculus hydraulic fluid port B of hydraulic cylinder 20
In the loculus of hydraulic cylinder 20.Owing to the big chamber hydraulic fluid port A oil pump capacity of hydraulic cylinder 20 is more than loculus hydraulic fluid port B oil inlet quantity, therefore, hydraulic cylinder
The hydraulic oil that the big chamber of 20 is flowed out in addition to the loculus of part influent cylinder pressure 20, also have part will by the 3rd group, the 4th
Group single plunger pump III, IV directly flow back to fuel tank 10, and this section hydraulic oil flows out from the big chamber of hydraulic cylinder 20, through the 3rd group, the 4th group
First oil inlet and outlet 56 of single plunger pump III, IV flows into, by the second turnover oil of the 3rd group, the 4th group single plunger pump III, IV
Mouth 57 flows into fuel tanks 10.
Two check valves 30 are as passive Fill valve, for when in hydraulic cylinder 20 motor process, being emptied occurs in oil circuit, to liquid
Pressure system is emptied oil circuit and carries out passive repairing.Two relief valve 40 are used for limiting hydraulic system MTP, when hydraulic cylinder 20 moves
During system pressure higher than safety valve pressure set threshold value time, the hydraulic oil of high-pressure oil passage directly will be flowed back to by relief valve 40
Fuel tank, and then prevent system pressure too high.
First group of output flow size to the 4th group of single plunger pump I, II, III and IV is by corresponding single plunger pump piston
54 motion frequencies determine.First group of single plunger pump I and second group of single plunger pump II work in combination, the 3rd group of single plunger pump III and
4th group of single plunger pump IV work in combination, carries out motion according to the characteristics of motion shown in Fig. 2 respectively and can realize without Pulse of flow and pressure
Hydraulic oil exports, and wherein v is piston movement speed；T is the time, and curve a and curve b amplitude, cycle are identical, and curve a phase place
It is ahead of curve b180 °.
First group of single plunger pump I and second group of single plunger pump II work in combination, for controlling the movement velocity of hydraulic cylinder 20,
3rd group of single plunger pump III and the 4th group of single plunger pump IV work in combination for carrying out repairing or inciting somebody to action to the difference in flow of hydraulic cylinder 20
Unnecessary hydraulic oil imports fuel tank 10.Two chamber difference in flow of hydraulic cylinder 20 can be had by the movement velocity of hydraulic cylinder 20 piston and two chambeies
Effect difference in areas solves.
Above are only the detailed description of the invention of the present invention, but the design concept of the present invention is not limited thereto, all utilize this
Design carries out the change of unsubstantiality to the present invention, all should belong to the behavior invading scope.
Claims (5)
1. the restructuring of single plunger pump more than controls a closed type hydraulic system for asymmetrical cylinder, including fuel tank and hydraulic cylinder, this liquid
Cylinder pressure is provided with big chamber hydraulic fluid port and loculus hydraulic fluid port, it is characterised in that: include two check valves, two relief valve and organize single plunger pump more；Should
First oil inlet and outlet of many group single plunger pumps is all connected with big chamber hydraulic fluid port, the second turnover oil of two groups of single plunger pumps of at least a part of which
Mouth is connected with loculus hydraulic fluid port, and the second oil inlet and outlet of the single plunger pump of remaining group connects the flow with compensating hydraulic cylinder with fuel tank
Difference；The outlet of two check valves is connected with big chamber hydraulic fluid port and loculus hydraulic fluid port respectively, and the import of two check valves connects with fuel tank；Two safety
The import of valve is connected with big chamber hydraulic fluid port and loculus hydraulic fluid port respectively, and the outlet of two relief valve connects with fuel tank.
A kind of many single plunger pumps the most as claimed in claim 1 restructuring controls the closed type hydraulic system of asymmetrical cylinder, and it is special
Levy and be: described single plunger pump includes motor, drive mechanism, plunger cylinder, piston and four reversal valves；This plunger cylinder is provided with
Four import and export；The P mouth of four reversal valves is connected with these four import and export respectively, and wherein the T mouth of two reversal valves is connected and conduct
First oil inlet and outlet, the T mouth of other two reversal valves is connected as the second oil inlet and outlet；This piston is arranged at this plunger case actively
Internal and be connected with drive mechanism；This motor connects drive transmission device action and drives plunger to move.
A kind of many single plunger pumps the most as claimed in claim 1 restructuring controls the closed type hydraulic system of asymmetrical cylinder, and it is special
Levying and be: include four groups of single plunger pumps, the first oil inlet and outlet of these four groups of single plunger pumps is all connected with described big chamber hydraulic fluid port；
Wherein the second oil inlet and outlet of two groups of single plunger pumps is connected with described loculus hydraulic fluid port, and the second of remaining single plunger pump of two groups enters
Oil-out connects with described fuel tank.
A kind of many single plunger pumps the most as claimed in claim 1 restructuring controls the closed type hydraulic system of asymmetrical cylinder, and it is special
Levy and be: when described hydraulic cylinder is moved right by control so that big chamber hydraulic fluid port oil inlet quantity more than loculus hydraulic fluid port oil pump capacity, then controls
Described loculus hydraulic fluid port hydraulic oil enters two groups of single plunger pumps of described at least a part of which through described second oil inlet and outlet, and after through described the
One oil inlet and outlet enters big chamber hydraulic fluid port；Controlling described fuel tank repairing again, this hydraulic oil enters through the second of remaining single plunger pump organized
Oil-out enters remaining group single plunger pump described, and after enter big oil pocket hydraulic fluid port through described first oil inlet and outlet.
A kind of many single plunger pumps the most as claimed in claim 1 restructuring controls the closed type hydraulic system of asymmetrical cylinder, and it is special
Levy and be: when described hydraulic cylinder is moved to the left by control so that big chamber hydraulic fluid port oil pump capacity more than loculus hydraulic fluid port oil inlet quantity, then controls
Described big chamber hydraulic fluid port hydraulic oil enters described single plunger pumps of organizing through described first oil inlet and outlet more, and after through described second turnover oil
Mouth enters loculus hydraulic fluid port and fuel tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610820537.1A CN106224323B (en) | 2016-09-13 | 2016-09-13 | A kind of closed type hydraulic system of more single plunger pump restructuring control asymmetrical cylinders |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610820537.1A CN106224323B (en) | 2016-09-13 | 2016-09-13 | A kind of closed type hydraulic system of more single plunger pump restructuring control asymmetrical cylinders |
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| Publication Number | Publication Date |
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| CN106224323A true CN106224323A (en) | 2016-12-14 |
| CN106224323B CN106224323B (en) | 2017-12-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610820537.1A Active CN106224323B (en) | 2016-09-13 | 2016-09-13 | A kind of closed type hydraulic system of more single plunger pump restructuring control asymmetrical cylinders |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023070742A1 (en) * | 2021-10-27 | 2023-05-04 | 烟台杰瑞石油装备技术有限公司 | Plunger pump system, pressure pulsation compensation method therefor, and fracturing device |
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| DE102012006219A1 (en) * | 2012-03-27 | 2013-10-02 | Robert Bosch Gmbh | Method and hydraulic control arrangement for controlling a consumer |
| CN204512035U (en) * | 2015-01-08 | 2015-07-29 | 中国人民解放军国防科学技术大学 | A kind of hydraulic energy-saving controller |
| CN105422523A (en) * | 2016-01-05 | 2016-03-23 | 浙江大学 | Digital hydraulic flow regulation system |
| JP2016511381A (en) * | 2013-03-15 | 2016-04-14 | エムティーエス システムズ コーポレイション | Servo actuator |
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- 2016-09-13 CN CN201610820537.1A patent/CN106224323B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002039112A (en) * | 2000-07-19 | 2002-02-06 | Nippon Sharyo Seizo Kaisha Ltd | Hydraulic device for construction work machine |
| DE102012006219A1 (en) * | 2012-03-27 | 2013-10-02 | Robert Bosch Gmbh | Method and hydraulic control arrangement for controlling a consumer |
| CN202833433U (en) * | 2012-09-21 | 2013-03-27 | 北京市三一重机有限公司 | Waterway pressure fluctuation controlling device and pumping system and engineering vehicle |
| JP2016511381A (en) * | 2013-03-15 | 2016-04-14 | エムティーエス システムズ コーポレイション | Servo actuator |
| CN204512035U (en) * | 2015-01-08 | 2015-07-29 | 中国人民解放军国防科学技术大学 | A kind of hydraulic energy-saving controller |
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| WO2023070742A1 (en) * | 2021-10-27 | 2023-05-04 | 烟台杰瑞石油装备技术有限公司 | Plunger pump system, pressure pulsation compensation method therefor, and fracturing device |
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| CN106224323B (en) | 2017-12-01 |
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