CN117846943A - Stepless variable pressure plunger pump based on proportional pressure reducing valve - Google Patents
Stepless variable pressure plunger pump based on proportional pressure reducing valve Download PDFInfo
- Publication number
- CN117846943A CN117846943A CN202410107491.3A CN202410107491A CN117846943A CN 117846943 A CN117846943 A CN 117846943A CN 202410107491 A CN202410107491 A CN 202410107491A CN 117846943 A CN117846943 A CN 117846943A
- Authority
- CN
- China
- Prior art keywords
- valve
- pressure
- reducing valve
- plunger pump
- pressure reducing
- 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.)
- Pending
Links
- 239000007788 liquid Substances 0.000 claims abstract description 30
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 8
- 238000013016 damping Methods 0.000 claims description 7
- 230000008859 change Effects 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 239000004065 semiconductor Substances 0.000 claims description 2
- 239000003921 oil Substances 0.000 description 12
- 230000000694 effects Effects 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000007363 regulatory process Effects 0.000 description 1
Landscapes
- Reciprocating Pumps (AREA)
Abstract
The invention discloses a stepless variable pressure plunger pump based on a proportional pressure reducing valve, which comprises a plunger pump body; the plunger pump body is provided with a liquid inlet and a liquid outlet; a piston is slidably arranged in the hydraulic cylinder; the piston divides the hydraulic cylinder into a sealed first cavity and a sealed second cavity; the first port of the constant pressure valve is communicated with the hydraulic oil tank, and the second port of the constant pressure valve is communicated with the second cavity; the constant pressure valve has two position states of on and off; the cavity where the first end of the valve core of the constant pressure valve is positioned is communicated with the liquid outlet, and the second end of the valve core of the constant pressure valve is provided with a first spring; the inlet end of the proportional pressure reducing valve is communicated with the liquid outlet of the plunger pump body; the outlet end of the proportional pressure reducing valve is communicated with a cavity where the second end of the valve core of the constant pressure valve is positioned; the controller is electrically connected with the proportional pressure reducing valve. The input control signal can adjust the output pressure of the proportional pressure reducing valve, so that the control pressure of the constant pressure valve is adjusted, and the hydraulic pump works at different pressure levels. The invention is applicable to hydraulic systems requiring pressure regulation.
Description
Technical Field
The invention relates to the technical field of variable-pressure plunger pumps, in particular to a stepless variable-pressure plunger pump based on a proportional pressure reducing valve.
Background
The hydraulic system has the characteristics of high power density and good reliability, wherein the hydraulic plunger pump is used as a high-efficiency, energy-saving and high-power source and is widely applied to the field of hydraulic systems of aircrafts, ships, engineering machinery and the like. The industrial system and the onboard hydraulic system adopt constant-pressure variable pump source systems, and the principle of the traditional constant-pressure variable pump is as follows: and comparing the force of the pump outlet pressure acting on the right end of the constant pressure valve with the first spring force of the left end to form mechanical feedback, so as to drive the follow-up piston to control the inclination angle of the inclination angle variable swash plate.
When the hydraulic pressure at the end part of the valve core of the constant pressure valve does not reach the first spring setting force, the valve core works at the left position, the oil in the follow-up piston flows back to the oil tank, the inclination angle of the inclination angle variable swash plate is at the maximum, and the discharge capacity of the pump is also the maximum; when the hydraulic pressure at the right end of the valve core is larger than the set force of the first spring, the valve core works at the right position, high-pressure oil is pumped out of the pump outlet cavity and enters the follow-up piston cavity, the driving piston enables the inclination angle of the inclination angle variable swash plate to be smaller, and when the outlet pressure and the flow are stable, the inclination angle variable swash plate is stable at a certain inclination angle, and at the moment, the valve core of the constant-pressure valve is in a neutral-position dynamic balance state.
The outlet pressure grade of the traditional constant pressure variable pump can be set by adjusting the pretightening force of a first spring at the left end of the constant pressure valve, and the industrial pump and the aviation pump are mostly realized by manual adjusting screws. However, the conventional constant pressure variable displacement pump can only work under a certain pressure level or two to three pressure levels, and is difficult to adapt to occasions with changeable pressure requirements.
However, the conventional constant-pressure variable pump can only output a fixed pressure, the technical scheme of the conventional variable-pressure pump is relatively complex, the pressure fluctuation generated in the pressure regulating process is large, and the conventional constant-pressure variable pump is difficult to adapt to the condition of frequent pressure conversion.
How to realize stepless continuous adjustment of the outlet pressure of a variable pump and improve the pressure adjustment reliability under different pressure working conditions is one of the important problems to be solved in the field.
Disclosure of Invention
The invention aims to provide a stepless pressure-variable plunger pump and a hydraulic system based on a proportional pressure reducing valve, so as to solve the defects in the prior art and adapt to the condition that load pressure is changed frequently.
The invention provides a stepless variable pressure plunger pump based on a proportional pressure reducing valve, which comprises,
the plunger pump body comprises a tilting angle variable swash plate; the plunger pump body is provided with a liquid inlet and a liquid outlet;
the hydraulic cylinder is internally provided with a piston in a sliding manner; the piston divides the hydraulic cylinder into a sealed first cavity and a sealed second cavity; one side of the piston, which is close to the first cavity, is connected with a piston rod, and one end of the piston rod, which extends out of the hydraulic cylinder, is connected with the inclination angle variable swash plate so as to adjust the inclination angle of the inclination angle variable swash plate; the method is characterized in that: also included is a method of manufacturing a semiconductor device,
the first port of the constant pressure valve is communicated with the hydraulic oil tank, and the second port of the constant pressure valve is communicated with the second cavity; the constant pressure valve has two position states of on and off; the cavity where the first end of the valve core of the constant pressure valve is located is communicated with the liquid outlet, and the second end of the valve core of the constant pressure valve is provided with a first spring;
the inlet end of the proportional pressure reducing valve is communicated with the liquid outlet of the plunger pump body; the outlet end of the proportional pressure reducing valve is communicated with a cavity where the second end of the valve core of the constant pressure valve is positioned;
and the controller is electrically connected with the proportional pressure reducing valve and is used for outputting a control signal to the proportional pressure reducing valve so as to control the pressure of the output end of the proportional pressure reducing valve.
The stepless pressure variable plunger pump based on the proportional pressure reducing valve, wherein, optionally, the two position states of the valve core of the constant pressure valve are switched, and the control is performed by the difference of the thrust at the two ends of the valve core.
The stepless pressure-variable plunger pump based on the proportional pressure reducing valve, wherein optionally, when the thrust force received by the first end of the valve core of the constant pressure valve is larger than the thrust force received by the second end, the valve core is switched to the communication position state; when the thrust force received by the first end of the valve core of the constant pressure valve is smaller than the thrust force received by the second end, the valve core is switched to the disconnection position state.
The stepless pressure-variable plunger pump based on the proportional pressure reducing valve, wherein optionally, a second spring is arranged in the second cavity, one end of the second spring is abutted against the piston, and the other end of the second spring is abutted against the inner wall of the hydraulic cylinder.
The stepless pressure variable plunger pump based on the proportional pressure reducing valve, wherein the stepless pressure variable plunger pump optionally further comprises a branch circuit; a damper is connected in series on the branch;
one end of the branch is communicated with the first cavity, and the other end of the branch is communicated with the second cavity.
The stepless pressure change plunger pump based on the proportional pressure reducing valve, wherein optionally, a damping hole is arranged on the damper, and the damping Kong Chuanjie is arranged on the branch.
The stepless pressure change plunger pump based on the proportional pressure reducing valve as described above, wherein the output pressure of the proportional pressure reducing valve is optionally regulated by a control signal to control the opening pressure of the constant pressure valve.
The stepless pressure-variable plunger pump based on the proportional pressure reducing valve, as described above, wherein optionally, the controller obtains a target load pressure, and outputs a control signal to the proportional pressure reducing valve according to the target load pressure, so as to adjust the output end of the proportional pressure reducing valve to a corresponding pressure, so as to change the thrust received by the second end of the valve core of the constant pressure valve.
The stepless variable pressure plunger pump based on the proportional pressure reducing valve, wherein the output pressure of the plunger pump is optionally determined by the opening pressure of the constant pressure valve.
Compared with the prior art, the valve core of the constant pressure valve is driven to move by the hydraulic pressure output by the output end of the proportional pressure reducing valve, and the control of the movement of the valve core of the constant pressure valve is realized by the pressure control of the output end of the proportional pressure reducing valve. The pressure of the proportional pressure reducing valve can be continuously regulated, so that the pressure at one end of the valve core of the constant pressure valve can be continuously regulated, the other end of the valve core of the constant pressure valve is communicated with the liquid outlet of the plunger pump body, when the liquid outlet pressure is smaller, the first port of the constant pressure valve is communicated with the second port, the oil in the second cavity is decompressed, and hydraulic oil flows into the hydraulic oil tank through the constant pressure valve; the piston moves to the second cavity side, and the inclined angle variable swash plate is pushed to adjust towards the direction of increasing the outlet pressure until the outlet pressure is increased to a state that the valve core of the constant pressure valve can be pushed to move to a disconnected state.
Drawings
FIG. 1 is a schematic illustration of the overall structure of the present invention;
reference numerals illustrate:
1-a plunger pump body, 2-a hydraulic cylinder, 3-a constant pressure valve, 4-a proportional pressure reducing valve, 5-a branch and 6-a hydraulic oil tank;
11-liquid inlet and 12-liquid outlet;
21-a piston, 22-a first cavity, 23-a second cavity, 24-a piston rod and 25-a second spring;
31-valve core, 32-first spring;
51-damper.
Detailed Description
The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In order to solve the problem of pressure regulation of the current variable plunger pump, under the trend of continuous intelligent development of equipment, if the output pressure of the hydraulic pump can be conveniently and rapidly regulated according to the actual working condition requirement, great flexibility and energy-saving benefit are brought in engineering. Based on the scheme, the scheme of the stepless pressure-variable plunger pump adopting the proportional pressure reducing valve is provided, and the stepless pressure continuous adjustment of the hydraulic plunger pump can be realized. The following disclosure describes exemplary embodiments of various implementations.
Referring to fig. 1, the invention provides a stepless variable pressure plunger pump based on a proportional pressure reducing valve, which comprises a plunger pump body 1, a hydraulic cylinder 2, a constant pressure valve 3, a proportional pressure reducing valve 4 and a controller, wherein the plunger pump body 1 is used for pumping hydraulic oil and providing pressure for a hydraulic system, and the hydraulic cylinder 2 is used for driving a tilting angle variable swash plate of the plunger pump body 1 to move so as to adjust the pumping oil quantity. The constant pressure valve 3 is used for setting corresponding pressure according to the pressure of the outlet end of the proportional pressure reducing valve 4 so as to enable the pressure of the liquid outlet 12 of the plunger pump body 1 to reach the pressure.
Specifically, the plunger pump body 1 includes a tilt angle variable type swash plate; the plunger pump body 1 is provided with a liquid inlet 11 and a liquid outlet 12.
The plunger pump body 1 adopts a tilting angle variable type swash plate to distribute oil, a cylinder body rotates, and a variable head variable type swash plate axial plunger pump is adopted, and the plunger reciprocates in the cylinder body to change the volume of a sealed working cavity so as to realize oil suction and oil pressing. The plunger is driven by eccentric rotation of the pump shaft to reciprocate, and the suction valve and the discharge valve are one-way valves. When the plunger is pulled outwards, the pressure in the working chamber is reduced, the outlet valve is closed, and when the pressure is lower than the inlet pressure, the inlet valve is opened, and liquid enters; when the plunger is pushed inwards, the pressure of the working chamber is increased, the inlet valve is closed, and when the pressure is higher than the outlet pressure, the outlet valve is opened, and liquid is discharged. When the transmission shaft drives the cylinder body to rotate, the plunger is pulled out or pushed back from the cylinder body by the inclined angle variable swash plate, and the oil sucking and discharging process is completed. The oil in the working containing cavity formed by the plunger and the cylinder hole is respectively communicated with the oil sucking and discharging cavity of the pump through the inclined angle variable swash plate. The specific structure is not described in detail, and reference can be made to the prior art.
A hydraulic cylinder 2, wherein a piston 21 is slidably mounted in the hydraulic cylinder 2; the piston 21 divides the hydraulic cylinder 2 into a sealed first chamber 22 and a second chamber 23; one side of the piston 21, which is close to the first cavity 22, is connected with a piston rod 24, and one end of the piston rod 24, which extends out of the hydraulic cylinder 2, is connected with the inclination angle variable swash plate to adjust the inclination angle of the inclination angle variable swash plate.
The hydraulic cylinder 2 is an actuator for adjusting the inclination angle of the inclination angle variable swash plate, and changes the displacement of the pump and the pressure of the liquid outlet 12 by adjusting the inclination angle of the inclination angle variable swash plate.
In the present embodiment, the constant pressure valve 3 and the proportional pressure reducing valve 4 are further included. The first port of the constant pressure valve 3 is communicated with the hydraulic oil tank 6, and the second port is communicated with the second cavity 23; the constant pressure valve 3 has two position states of on and off; the cavity where the first end of the valve core 31 of the constant pressure valve 3 is located is communicated with the liquid outlet 12, and the second end of the valve core 31 of the constant pressure valve 3 is provided with a first spring 32. That is, two cavities are respectively arranged at two ends of the valve core 31 of the constant pressure valve 3, and the two cavities are respectively communicated with the liquid outlet 12 and the outlet of the proportional pressure reducing valve 4, that is, the pressure received by the two ends of the valve core 31 drives the valve core 31 to move, so that the constant pressure valve 3 is switched between the on-off position states.
The inlet end of the proportional pressure reducing valve 4 is communicated with the liquid outlet 12 of the plunger pump body 1; the outlet end of the proportional pressure reducing valve 4 is communicated with a cavity where the second end of the valve core 31 of the constant pressure valve 3 is located. In the implementation, since the pressure at the outlet end of the proportional pressure reducing valve 4 can be adjusted in real time as required, when the proportional pressure reducing valve 4 receives a control signal for increasing the pressure, the pressure at the outlet end is increased, the valve core 31 of the constant pressure valve 3 moves to the conducting position under the action of the pressure difference between the two ends, and the piston of the hydraulic cylinder 2 moves to the side deviating from the piston rod 24, so that the oil pumping amount is increased, and the pressure of a load system is increased. Therefore, stepless continuous regulation of pressure can be realized, and good energy-saving effect and control performance are achieved. The scheme simplifies the pressure-variable structure, reduces the cost, and has strong pressure-stabilizing capability and strong dynamic tracking performance.
The controller is electrically connected with the proportional pressure reducing valve 4, and is used for outputting a control signal to the proportional pressure reducing valve 4 so as to control the pressure of the output end of the proportional pressure reducing valve 4. In specific implementation, the controller can adjust the output pressure of the proportional pressure reducing valve 4 to a proper range according to the working requirement of the hydraulic load, and stepless adjustment is realized in the proper range. Can be suitable for various occasions with changeable pressure requirements.
In specific implementation, the switching of the two positions of the valve body 31 of the constant pressure valve 3 is controlled by the difference between the thrust forces at the two ends of the valve body 31. In a specific implementation, when the thrust force received by the first end of the valve core 31 of the constant pressure valve 3 is greater than the thrust force received by the second end, the valve core 31 is switched to the communication position state; when the thrust force received by the first end of the valve body 31 of the constant pressure valve 3 is smaller than the thrust force received by the second end, the valve body 31 is switched to the off position state. In practice, in order to ensure that the valve core 31 of the constant pressure valve 3 can adapt to a wide range of pressure regulation and prevent the whole device from being kept at a preset pressure to be kept in a protection state due to the failure of the proportional pressure reducing valve 4 or the failure of receiving a control signal. The following improvements are made in this embodiment, a second spring 25 is disposed in the second cavity 23, one end of the second spring 25 abuts against the piston 21, and the other end abuts against the inner wall of the hydraulic cylinder 2. That is, in use, the movement of the valve element 31 is effected in accordance with the difference in thrust between the two ends of the valve element 31, specifically, the thrust at one end thereof is provided by the pressure of the liquid outlet 12 and the thrust at the other end thereof is provided by the outlet end of the proportional pressure reducing valve 4 and the second spring 25 together.
In this application, the proportional pressure reducing valve can adopt automatically controlled proportional pressure reducing valve, and the requirement to the proportional pressure reducing valve is limited to its effect, can realize realizing the automatically controlled valve of output pressure control effect under control signal effect all can, and the person skilled in the art can select as required.
In the specific implementation, in order to provide damping for the system, the flow rate of the hydraulic cylinder 2 is stabilized, the stability is increased, and the embodiment also comprises a branch 5; a damper 51 is connected in series with the branch 5. One end of the branch 5 is communicated with the first cavity 22, and the other end is communicated with the second cavity 23. More specifically, the damper 51 is provided with a damping hole, and the damping Kong Chuanjie is provided on the branch 5.
In order to acquire the pressure at the liquid outlet 12 in real time during control so as to control a control signal for controlling the proportional pressure reducing valve 4 according to the pressure of the liquid outlet 12, the control device further comprises a pressure sensor for detecting the pressure at the liquid outlet 12 during specific implementation; the controller is electrically connected with the pressure sensor, and adjusts and controls a control signal of the proportional pressure reducing valve 4 according to a detection result of the pressure sensor. In specific implementation, the output pressure of the proportional pressure reducing valve is regulated by a control signal to control the opening pressure of the constant pressure valve. The output pressure of the plunger pump is determined by the opening pressure of the constant pressure valve.
In specific implementation, the plunger pump provided by the invention can be used for a hydraulic system, such as a hydraulic system, wherein the plunger pump comprises the stepless variable-pressure plunger pump and a hydraulic load; the hydraulic load is in communication with the outlet 12. Specifically, the controller acquires a target load pressure, and outputs a control signal to the proportional pressure reducing valve 4 according to the target load pressure to adjust the output end of the proportional pressure reducing valve 4 to a corresponding pressure to change the thrust received by the second end of the spool 31 of the constant pressure valve 3. In particular implementations, the target load pressure may be determined by the controller based on the actual operating conditions of the overall hydraulic system and the current pressure at the outlet 12. The pressure of the outlet end of the proportional reducing valve 4 can be continuously and steplessly adjusted, so that the preset pressure on one side of the valve core 31 of the constant pressure valve 3 can be continuously and adjustably adjusted, and the pressure at one end of the liquid outlet is increased to the preset pressure.
In the above-described various embodiments of the stepless pressure-regulating variable displacement pump, the components may be a plurality of different parts and connected by pipelines, or may be integrally formed as an assembly component, in which case the pipeline is not limited to an actual pipe, but may be a flow path formed by forming a hole or a groove in a body, which acts as a connecting pipe.
While the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (9)
1. A stepless variable pressure plunger pump based on a proportional pressure reducing valve comprises,
a plunger pump body (1) including a swash plate having a variable inclination angle; the plunger pump body (1) is provided with a liquid inlet (11) and a liquid outlet (12);
the hydraulic cylinder (2) is internally provided with a piston (21) in a sliding manner; the piston (21) divides the hydraulic cylinder (2) into a sealed first cavity (22) and a sealed second cavity (23); one side of the piston (21) close to the first cavity (22) is connected with a piston rod (24), and one end of the piston rod (24) extending out of the hydraulic cylinder (2) is connected with the inclination angle variable swash plate so as to adjust the inclination angle of the inclination angle variable swash plate; the method is characterized in that: also included is a method of manufacturing a semiconductor device,
the first port of the constant pressure valve (3) is communicated with the hydraulic oil tank (6), and the second port of the constant pressure valve (3) is communicated with the second cavity (23); the constant pressure valve (3) has two position states of on and off; the cavity of the first end of the valve core (31) of the constant pressure valve (3) is communicated with the liquid outlet (12), and the second end of the valve core (31) of the constant pressure valve (3) is provided with a first spring (32);
the inlet end of the proportional pressure reducing valve (4) is communicated with the liquid outlet (12) of the plunger pump body (1); the outlet end of the proportional pressure reducing valve (4) is communicated with a cavity where the second end of the valve core (31) of the constant pressure valve (3) is positioned;
and the controller is electrically connected with the proportional pressure reducing valve (4) and is used for outputting a control signal to the proportional pressure reducing valve (4) so as to control the pressure of the output end of the proportional pressure reducing valve (4).
2. The stepless variable pressure plunger pump based on proportional pressure reducing valve as claimed in claim 1, wherein: the switching of the two position states of the valve core (31) of the constant pressure valve (3) is controlled by the difference of the thrust forces at the two ends of the valve core (31).
3. The stepless variable pressure plunger pump based on proportional pressure reducing valve according to claim 2, wherein: when the thrust force received by the first end of the valve core (31) of the constant pressure valve (3) is larger than the thrust force received by the second end, the valve core (31) is switched to a communication position state; when the thrust force received by the first end of the valve core (31) of the constant pressure valve (3) is smaller than the thrust force received by the second end, the valve core (31) is switched to the off position state.
4. A stepless variable pressure plunger pump based on a proportional pressure reducing valve according to claim 3, characterized in that: a second spring (25) is arranged in the second cavity (23), one end of the second spring (25) is abutted against the piston (21), and the other end is abutted against the inner wall of the hydraulic cylinder (2).
5. The stepless variable pressure plunger pump based on proportional pressure reducing valve as claimed in claim 1, wherein: also comprises a branch (5); a damper (51) is connected in series with the branch (5);
one end of the branch (5) is communicated with the first cavity (22), and the other end is communicated with the second cavity (23).
6. The stepless variable pressure plunger pump based on proportional pressure reducing valve according to claim 5, wherein: the damper (51) is provided with a damping hole, and the damping Kong Chuanjie is arranged on the branch (5).
7. The stepless variable pressure plunger pump based on proportional pressure reducing valve as claimed in claim 1, wherein: the output pressure of the proportional pressure reducing valve is regulated by a control signal to control the opening pressure of the constant pressure valve.
8. The stepless variable pressure plunger pump based on the proportional pressure reducing valve according to claim 1, wherein the controller obtains a target load pressure and outputs a control signal to the proportional pressure reducing valve (4) according to the target load pressure to adjust the output end of the proportional pressure reducing valve (4) to a corresponding pressure to change the thrust received by the second end of the valve core (31) of the constant pressure valve (3).
9. The stepless variable pressure plunger pump based on proportional pressure reducing valve according to any one of claims 1 to 8, wherein the magnitude of the output pressure of the plunger pump is determined by the magnitude of the constant pressure valve opening pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410107491.3A CN117846943A (en) | 2024-01-25 | 2024-01-25 | Stepless variable pressure plunger pump based on proportional pressure reducing valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410107491.3A CN117846943A (en) | 2024-01-25 | 2024-01-25 | Stepless variable pressure plunger pump based on proportional pressure reducing valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117846943A true CN117846943A (en) | 2024-04-09 |
Family
ID=90538186
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410107491.3A Pending CN117846943A (en) | 2024-01-25 | 2024-01-25 | Stepless variable pressure plunger pump based on proportional pressure reducing valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117846943A (en) |
-
2024
- 2024-01-25 CN CN202410107491.3A patent/CN117846943A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109469594B (en) | Continuous pressure regulating electro-hydraulic proportional axial plunger variable pump for aircraft hydraulic system | |
| CA3040627A1 (en) | Displacement pump and control system | |
| US6109030A (en) | Apparatus and method for ganging multiple open circuit pumps | |
| CN111608972B (en) | High-low pressure switching type hydraulic mechanical leg with robot and load port independently controlled | |
| US5123815A (en) | Fluid pumping apparatus with load limiting control | |
| CN106640798B (en) | The electrohydraulic controlling mechanism of pressure-adjustable and off-load | |
| CN112594238B (en) | Stepless pressure regulating variable plunger pump with electric control proportion | |
| CN117846943A (en) | Stepless variable pressure plunger pump based on proportional pressure reducing valve | |
| US4715788A (en) | Servo control variable displacement pressure compensated pump | |
| JPH0792087B2 (en) | Control device for drive system with applied pressure | |
| CA1225279A (en) | Variable displacement pump system | |
| CN106640575B (en) | Electrohydraulic controlling mechanism | |
| CN113454338B (en) | Hydraulic actuator with overpressure compensation | |
| JPH0617761A (en) | Power controller for at least two variable discharge hydraulic pump | |
| CN107061394B (en) | The electrohydraulic controlling mechanism of adjustable pressure susceptibility | |
| CN113227587B (en) | Hydraulic variable pump set and excavator | |
| JPH0319396B2 (en) | ||
| CN106593969B (en) | Electrohydraulic controlling mechanism | |
| CN221347139U (en) | Constant power type axial plunger pump | |
| US5062265A (en) | Hydromechanical control of differential pressure across a variable displacement hydraulic motor | |
| RU2052673C1 (en) | Electrohydraulic servo drive | |
| CN106499683B (en) | Electrohydraulic controlling mechanism | |
| US6324841B1 (en) | Power- and moment-regulating system for a plurality of hydraulic pumps | |
| CN111005899B (en) | Load-sensitive hydraulic system with controllable oil pump limit displacement, control method and engineering machinery | |
| RU2127686C1 (en) | Pump hydraulic drive |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |