CN112594238A - Stepless pressure regulating variable plunger pump with electric control proportion - Google Patents
Stepless pressure regulating variable plunger pump with electric control proportion Download PDFInfo
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- CN112594238A CN112594238A CN202011392899.8A CN202011392899A CN112594238A CN 112594238 A CN112594238 A CN 112594238A CN 202011392899 A CN202011392899 A CN 202011392899A CN 112594238 A CN112594238 A CN 112594238A
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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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
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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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
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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
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20546—Type of pump variable capacity
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
Abstract
The invention provides an electrically-controlled proportional stepless pressure-regulating variable plunger pump, which comprises a swash plate type variable plunger pump, a variable piston cylinder, a first electric control valve, a second electric control valve and a controller, wherein the swash plate type variable plunger pump is connected with the first electric control valve; the output end of the swash plate type variable plunger pump is respectively connected with the rod cavity and the input end of the first electric control valve through pipelines; the rodless cavity is connected with the output end of the first electric control valve and the input end of the second electric control valve through pipelines respectively; the output end of the second electric control valve is connected with an oil return pipeline; the input end of the controller receives an output pressure signal and a set pressure signal of the swash plate type variable plunger pump; the output end of the controller is respectively connected with the first electric control valve and the second electric control valve, and the output pressure of the swash plate type variable plunger pump is adjusted to tend to the set pressure by controlling the opening and closing of the first electric control valve and the second electric control valve. The stepless continuous regulation device can realize stepless continuous regulation of the outlet pressure of the plunger pump, and achieve good energy-saving effect and control performance.
Description
Technical Field
The disclosure relates to the technical field of hydraulic plunger pumps, in particular to an electric control proportional stepless pressure regulating variable plunger pump.
Background
The hydraulic plunger pump is a high-efficiency, energy-saving and high-power hydraulic power source, and is widely applied to the fields of hydraulic systems of engineering machinery, machine tool industry, aerospace industry and the like. The traditional constant-pressure variable pump principle is as follows: the pressure of the outlet of the pump is led to a constant pressure valve in the pump, compared with a set value and output to a piston cylinder, and a swash plate of the hydraulic pump is pushed to change an inclination angle, so that the function of stabilizing at a certain pressure is realized. However, the constant pressure variable pump can only output a fixed pressure, and is difficult to adapt to occasions with variable requirements.
Disclosure of Invention
In order to solve or at least alleviate at least one of the above technical problems, the present disclosure provides an electrically controlled proportional stepless pressure regulating variable plunger pump to achieve stepless continuous regulation of the outlet pressure of the plunger pump, thereby achieving good energy saving effect and control performance.
According to one aspect of the present disclosure, an electronically proportional, stepless pressure regulating, variable displacement plunger pump comprises: the variable piston type variable displacement pump comprises a swash plate type variable piston pump, a variable piston cylinder, a first electric control valve, a second electric control valve and a controller;
the variable piston cylinder comprises a piston and a piston rod, and the piston rod is connected with a swash plate of the swash plate type variable plunger pump and is used for adjusting the inclination angle of the swash plate so as to adjust the output pressure of the swash plate type variable plunger pump;
the output end of the swash plate type variable plunger pump is connected with the rod cavity of the variable piston cylinder and the input end of the first electric control valve through pipelines respectively; a rodless cavity of the variable piston cylinder is respectively connected with the output end of the first electric control valve and the input end of the second electric control valve through pipelines; the output end of the second electric control valve is connected with an oil return pipeline;
the input end of the controller receives an output pressure signal and a set pressure signal of the swash plate type variable plunger pump; the output end of the controller is respectively connected with the first electric control valve and the second electric control valve, and the output pressure of the swash plate type variable displacement plunger pump is adjusted to approach the set pressure by controlling the opening and closing of the first electric control valve and the second electric control valve.
According to at least one embodiment of the present disclosure, the controller performs the following control process:
comparing the output pressure of the swash plate type variable displacement plunger pump with the set pressure;
if the output pressure of the swash plate type variable displacement plunger pump is larger than the set pressure, enabling the first electronic control valve to be in an opening state and the second electronic control valve to be in a closing state;
if the output pressure of the swash plate type variable displacement plunger pump is smaller than the set pressure, enabling the first electronic control valve to be in a closed state and enabling the second electronic control valve to be in an open state;
and if the output pressure of the swash plate type variable displacement plunger pump is equal to the set pressure, enabling the first electronic control valve to be in a closed state and enabling the second electronic control valve to be in a closed state.
According to at least one embodiment of the present disclosure, the first electrically controlled valve is an electrically controlled overflow valve, and the second electrically controlled valve is an electrically controlled sequence valve.
According to at least one embodiment of the present disclosure, the electrically controlled overflow valve is a normally open, internally controlled bleed-out overflow valve; the electric control sequence valve is a normally closed and externally controlled leakage type sequence valve;
the pressure leading-in end of the electric control overflow valve is connected with the input end of the electric control overflow valve; the pressure leading-in end of the electric control sequence valve is connected with the output end of the swash plate type variable plunger pump; and the electric control end of the electric control overflow valve and the electric control end of the electric control sequence valve are both connected to the output end of the controller so as to control the opening and closing of the electric control overflow valve and the electric control sequence valve.
According to at least one embodiment of the present disclosure, the output end of the controller is configured to send signals to the electric control end of the electric control overflow valve and the electric control end of the electric control sequence valve, so as to set the operating pressures of the electric control overflow valve and the electric control sequence valve.
According to at least one embodiment of the present disclosure, a first damping device is connected in series with a pipeline connecting an output end of the first electronic control valve and the rodless cavity; and a second damping device is connected in series on a pipeline connecting the input end of the second electric control valve and the rodless cavity.
According to at least one embodiment of the present disclosure, the first damping device and the second damping device each employ a damping orifice.
According to at least one embodiment of the present disclosure, an output end of the swash plate type variable displacement plunger pump is connected with a pressure sensor for monitoring an output pressure of the swash plate type variable displacement plunger pump; the pressure sensor is connected with the input end of the controller and transmits an output pressure signal to the controller.
The output end of the plunger pump adopts a pipeline playing a role in pressure feedback and is respectively connected with a rod cavity of a variable piston cylinder and the input end of a first electric control valve; a rodless cavity of the variable piston cylinder is respectively connected with the output end of the first electric control valve and the input end of the second electric control valve through pipelines; the pressure in the piston cylinder is controlled by the first electric control valve and the second electric control valve. The movement of the pistons changes the inclination angle of the swash plate and regulates the flow rate and outlet pressure of the plunger pump. Because the first electric control valve and the second electric control valve are connected with the controller, the controller receives the output pressure signal and the set pressure signal of the swash plate type variable plunger pump and can adjust the opening and closing of the swash plate type variable plunger pump according to the electric control signals, the stepless continuous adjustment of the pressure can be realized, and the good energy-saving effect and the good control performance are achieved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the disclosure and together with the description serve to explain the principles of the disclosure.
FIG. 1 is a hydraulic schematic diagram of an exemplary configuration of an electronically controlled proportional stepless pressure regulating variable displacement plunger pump of the present disclosure.
Description of reference numerals:
1-swash plate variable displacement piston pump; 2-a variable piston cylinder; 3-a first damping device; 4-a second damping device; 5-an electrically controlled overflow valve; 6-an electrically controlled sequence valve; 7-a controller; 8-pressure sensor.
Detailed Description
The present disclosure will be described in further detail with reference to the drawings and embodiments. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limitations of the present disclosure. It should be further noted that, for the convenience of description, only the portions relevant to the present disclosure are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict. The present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
In order to solve the problems of the existing hydraulic plunger pump, under the development trend of current equipment intellectualization, if the output pressure of the hydraulic pump can be changed according to requirements, great flexibility and good energy-saving benefits are brought in use. Based on the scheme, the stepless variable pressure pump scheme based on the electric control valve can realize stepless continuous regulation of the pressure of the hydraulic plunger pump. Exemplary embodiments of various implementations are described below.
In accordance with one aspect of the present disclosure, reference is made to a hydraulic schematic diagram of one exemplary configuration of an electrically controlled proportional stepless pressure regulating variable displacement plunger pump shown in FIG. 1. A stepless pressure regulating variable plunger pump with an electric control proportion comprises a swash plate type variable plunger pump 1, a variable piston cylinder 2, a first electric control valve, a second electric control valve and a controller 7.
The swash plate type variable plunger pump 1 adopts an oil distribution disc to distribute oil, a cylinder body rotates, and a swash plate type axial plunger pump with variable head is adopted, and the volume of a sealed working cavity is changed by reciprocating a plunger in the cylinder body to realize oil absorption and oil pressing. The plunger is driven by the eccentric rotation of the pump shaft to reciprocate, and the suction valve and the discharge valve are both 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 rises, 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 swash plate, and the oil suction and discharge process is completed. The oil in the working chamber formed by the plunger and the cylinder hole is respectively communicated with the oil suction chamber and the oil discharge chamber of the pump through the oil distribution disc. The detailed structure is not described in detail, and reference can be made to the prior art.
The variable piston cylinder 2 is an actuator for adjusting the inclination angle of the swash plate, and is used for changing the inclination angle of the swash plate, and the displacement and outlet pressure of the pump can be changed by adjusting the inclination angle of the swash plate. The variable piston cylinder 2 comprises a piston and a piston rod, wherein the piston is movably arranged in the cylinder body and divides the cylinder body into two cavities. One end of the piston rod is fixedly connected to one side of the piston, the other end of the piston rod penetrates through the cavity on one side of the piston and extends out of the cylinder body, and the extending end of the piston rod is connected with a swash plate of the swash plate type variable displacement piston pump 1 and used for adjusting the inclination angle of the swash plate so as to adjust the output pressure of the swash plate type variable displacement piston pump 1. The cavity on one side with the piston rod is called the rod cavity, and the cavity on the other side without the piston rod is called the rodless cavity.
The output end (namely, an oil outlet) of the swash plate type variable plunger pump 1 is respectively connected with the rod cavity of the variable piston cylinder 2 and the input end of the first electric control valve through pipelines. A rodless cavity of the variable piston cylinder 2 is respectively connected with the output end of the first electric control valve and the input end of the second electric control valve through pipelines; and the output end of the second electric control valve is connected with an oil return pipeline. Optionally, an oil outlet of the swash plate type variable plunger pump 1 is generally connected with a hydraulic load through a main hydraulic pipeline, a branch pipeline for pressure feedback can be connected out of the main hydraulic pipeline in the disclosure, one branch pipeline is connected to the rod cavity of the variable piston cylinder 2, and the pressure of the main hydraulic pipeline, namely the oil outlet of the pump, is directly fed back to the rod cavity of the variable piston cylinder 2. The other branch is connected to the input end of the first electric control valve, and the output end of the first electric control valve is connected to the rodless cavity of the variable piston cylinder 2. When the first electric control valve is in an open state, the pressure of the main hydraulic pipeline, namely the oil outlet of the pump, is fed back to the rodless cavity of the variable piston cylinder 2 through the first electric control valve. When the first electric control valve is in a closed state, the pressure feedback of the branch is cut off. A line can be bypassed further on the line connecting the output of the first electrically controlled valve to the rodless chamber of the variable piston cylinder 2 for connection to the input of the second electrically controlled valve. Therefore, when the second electric control valve is in an open state, the rodless cavity of the variable piston cylinder 2 can be connected with the oil return pipeline through the second electric control valve to carry out pressure relief, and when the second electric control valve is in a closed state, the pressure relief effect of the branch is cut off. It should be noted that the electric control valve used in the present disclosure is also called an electromagnetic valve, and the electric control valve can be divided into a plurality of different types, and the requirements for the electric control valve in the present disclosure are limited to the functions of the electric control valve, and any electric control valve capable of realizing opening and closing under the electric control function of the controller 7 may be used.
The input end of the controller 7 receives an output pressure signal and a set pressure signal of the swash plate type variable displacement piston pump 1. The output end of the controller 7 is respectively connected with the first electric control valve and the second electric control valve, and the output pressure of the swash plate type variable plunger pump 1 is adjusted to tend to the set pressure by controlling the opening and closing of the first electric control valve and the second electric control valve. The controller 7 may be a Central Processing Unit (CPU), or may be other general-purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, or the like. Wherein a general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The electric control valve is provided with an electric control connecting end for receiving electric control signals, and the output ends of the controller 7 are respectively connected to the corresponding electric control connecting ends.
The output end of the electric control proportional stepless pressure regulating variable plunger pump adopts a pipeline playing a role in pressure feedback, and the pipeline is respectively connected with the rod cavity of the variable piston cylinder 2 and the input end of the first electric control valve; a rodless cavity of the variable piston cylinder 2 is respectively connected with the output end of the first electric control valve and the input end of the second electric control valve through pipelines; the pressure in the piston cylinder is controlled by the first electric control valve and the second electric control valve. The movement of the pistons changes the inclination angle of the swash plate and regulates the flow rate and outlet pressure of the plunger pump. Because the first electric control valve and the second electric control valve are connected with the controller 7, the controller 7 receives the output pressure signal and the set pressure signal of the swash plate type variable plunger pump 1 and can adjust the opening and closing of the swash plate type variable plunger pump according to the electric control signals, the stepless continuous adjustment of the pressure can be realized, and the good energy-saving effect and the good control performance are achieved. The scheme does not contain a constant pressure valve, reduces the volume and the cost, and has strong pressure stabilizing capability and strong dynamic tracking performance.
Further, the controller 7 performs the following control process:
the output pressure of the swash plate type variable displacement plunger pump 1 is compared with the set pressure. The set pressure, i.e. the target pressure, can be input in real time according to the target value to be adjusted, and after the pressure set value is input, the controller 7 compares it with the feedback output pressure. The following different execution actions are performed according to the result of the comparison.
And if the output pressure of the swash plate type variable displacement plunger pump 1 is greater than the set pressure, enabling the first electronic control valve to be in an open state and the second electronic control valve to be in a closed state. This state indicates that the set pressure is adjusted to a lower value, and the output pressure needs to be decreased to the same level as the set pressure. Because the first electric control valve is in an open state and the second electric control valve is in a closed state, the pressure at the output end of the swash plate type variable plunger pump 1 is transmitted to the rodless cavity of the variable piston cylinder 2 through the first electric control valve. That is, the pressure oil enters the right cavity of the variable piston cylinder 2 through the first electric control valve (with the direction shown in fig. 1 as reference), the rod cavity and the rodless cavity of the piston cylinder both receive the feedback pressure of the output end, but because the stress area of the piston at one side of the rodless cavity is larger than the stress area at one side of the rod cavity, the right side pressure of the piston is larger than the left side pressure, the piston is pushed to move left continuously, the piston rod pushes the swash plate to shift so that the inclination angle is gradually reduced, thereby gradually reducing the pressure at the output end of the swash plate type variable plunger pump 1 until the pressure is reduced to be equal to the set pressure, the first electric control valve is closed.
And if the output pressure of the swash plate type variable displacement plunger pump 1 is smaller than the set pressure, enabling the first electronic control valve to be in a closed state and enabling the second electronic control valve to be in an open state. This state indicates that the value of the set pressure is increased, and it is necessary to raise the output pressure to the same level as the set pressure. Because the first electric control valve is in a closed state, the second electric control valve is in an open state, pressure oil in a rodless cavity of the variable piston cylinder 2 is connected to an oil return pipeline through the second electric control valve for pressure relief, and a rod cavity of the piston cylinder receives feedback pressure of an output end, so that the left side pressure of the piston is greater than the right side pressure, the piston is pushed to move to the right continuously, the piston rod pushes the swash plate to shift to increase the inclination angle gradually, the pressure at the output end of the swash plate type variable plunger pump 1 is gradually increased, the second electric control valve is closed until the pressure is equal to the set pressure, and the piston stops moving.
And if the output pressure of the swash plate type variable displacement plunger pump 1 is equal to the set pressure, enabling the first electronic control valve to be in a closed state and enabling the second electronic control valve to be in a closed state. The state shows that the output pressure is stabilized to be equal to the set pressure value, and the first electric control valve and the second electric control valve are both in the closed state, so that the piston of the variable piston cylinder 2 is static and the output pressure is unchanged.
It can be seen that the first electronic control valve, the second electronic control valve and the controller 7 are equivalent to a pressure regulation module, and the output pressure of the swash plate type variable displacement plunger pump 1 can be steplessly regulated according to the set pressure value input to the controller 7 in real time.
In one embodiment of the present disclosure, the first electrically controlled valve may adopt an electrically controlled overflow valve 5, and the second electrically controlled valve may adopt an electrically controlled sequence valve 6.
Preferably, the electric control overflow valve 5 can be a normally open and internal control leakage type overflow valve; the electrically controlled sequence valve 6 can be a normally closed and externally controlled sequence valve with leakage.
The pressure leading-in end of the electrically controlled overflow valve 5 is connected with the input end of the electrically controlled overflow valve (shown by a dotted line in fig. 1); the pressure inlet of the electrically controlled sequence valve 6 is connected to the outlet of the swash plate variable displacement piston pump 1 (shown in dashed lines in fig. 1). And the electric control end of the electric control overflow valve 5 and the electric control end of the electric control sequence valve 6 are both connected to the output end of the controller 7 so as to control the opening and closing of the electric control overflow valve 5 and the electric control sequence valve 6.
Further, the output end of the controller 7 is configured to send signals to the electric control end of the electric control overflow valve 5 and the electric control end of the electric control sequence valve 6, so as to set the operating pressures of the electric control overflow valve 5 and the electric control sequence valve 6. The electric control signal of the electric control overflow valve 5 is consistent with the electric control signal of the electric control sequence valve 6. The actuation pressure is the actuation pressure at which the opening and closing action is performed. That is to say, the actuating pressures of the electrically controlled relief valve 5 and the electrically controlled sequence valve 6 can be set by the electrical control signal, so that the outlet pressure of the hydraulic pump is proportional to the electrical control signal, and the magnitude of the outlet pressure is determined by the electrical control signal. For example, the operating pressures of the electrically controlled relief valve 5 and the electrically controlled priority valve 6 are set as the output pressure of the hydraulic pump.
In one embodiment of the present disclosure, a first damping device 3 is connected in series on a pipeline connecting an output end of the first electric control valve and the rodless cavity; and a second damping device 4 is connected in series on a pipeline connecting the input end of the second electric control valve and the rodless cavity. A parallel structure is formed between the first damping device 3 and the second damping device 4. The purpose of this arrangement is in order to play the damping cushioning effect, for the system provides the damping, stabilizes the flow of business turn over variable piston, increases stability. Optionally, the first damping device 3 and the second damping device 4 both use damping holes.
In one embodiment of the present disclosure, the output end of the swash plate type variable displacement plunger pump 1 is connected with a pressure sensor 8 for monitoring the output pressure of the swash plate type variable displacement plunger pump 1. The pressure sensor 8 is connected to an input end of the controller 7 and transmits an output pressure signal to the controller 7.
In the different embodiments of the above-described stepless pressure-regulating variable displacement plunger pump, the components may be a plurality of different parts, which are connected with each other by pipelines, or may be integrally formed as an assembly component, in which case, the pipelines are not limited to actual pipes, and may be formed by opening ducts or grooves in the solid body to function as flow paths of connecting pipes.
In the description herein, reference to the description of the terms "one embodiment/mode," "some embodiments/modes," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/mode or example is included in at least one embodiment/mode or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to be the same embodiment/mode or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/aspects or examples and features of the various embodiments/aspects or examples described in this specification can be combined and combined by one skilled in the art without conflicting therewith.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
It will be understood by those skilled in the art that the foregoing embodiments are merely for clarity of illustration of the disclosure and are not intended to limit the scope of the disclosure. Other variations or modifications may occur to those skilled in the art, based on the foregoing disclosure, and are still within the scope of the present disclosure.
Claims (8)
1. An electrically controlled proportional variable displacement pump with stepless pressure regulation, comprising: the variable piston type variable displacement pump comprises a swash plate type variable piston pump, a variable piston cylinder, a first electric control valve, a second electric control valve and a controller;
the variable piston cylinder comprises a piston and a piston rod, and the piston rod is connected with a swash plate of the swash plate type variable plunger pump and is used for adjusting the inclination angle of the swash plate so as to adjust the output pressure of the swash plate type variable plunger pump;
the output end of the swash plate type variable plunger pump is connected with the rod cavity of the variable piston cylinder and the input end of the first electric control valve through pipelines respectively; a rodless cavity of the variable piston cylinder is respectively connected with the output end of the first electric control valve and the input end of the second electric control valve through pipelines; the output end of the second electric control valve is connected with an oil return pipeline;
the input end of the controller receives an output pressure signal and a set pressure signal of the swash plate type variable plunger pump; the output end of the controller is respectively connected with the first electric control valve and the second electric control valve, and the output pressure of the swash plate type variable displacement plunger pump is adjusted to approach the set pressure by controlling the opening and closing of the first electric control valve and the second electric control valve.
2. An electrically proportional variable displacement pump according to claim 1, wherein the controller performs the following control procedures:
comparing the output pressure of the swash plate type variable displacement plunger pump with the set pressure;
if the output pressure of the swash plate type variable displacement plunger pump is larger than the set pressure, enabling the first electronic control valve to be in an opening state and the second electronic control valve to be in a closing state;
if the output pressure of the swash plate type variable displacement plunger pump is smaller than the set pressure, enabling the first electronic control valve to be in a closed state and enabling the second electronic control valve to be in an open state;
and if the output pressure of the swash plate type variable displacement plunger pump is equal to the set pressure, enabling the first electronic control valve to be in a closed state and enabling the second electronic control valve to be in a closed state.
3. The electrically controlled proportional variable displacement pump according to claim 1 or 2, wherein the first electrically controlled valve is an electrically controlled relief valve and the second electrically controlled valve is an electrically controlled sequence valve.
4. The electrically-controlled proportional stepless pressure regulating variable plunger pump according to claim 3, wherein the electrically-controlled overflow valve is a normally open and internally-controlled leakage overflow valve; the electric control sequence valve is a normally closed and externally controlled leakage type sequence valve;
the pressure leading-in end of the electric control overflow valve is connected with the input end of the electric control overflow valve; the pressure leading-in end of the electric control sequence valve is connected with the output end of the swash plate type variable plunger pump; and the electric control end of the electric control overflow valve and the electric control end of the electric control sequence valve are both connected to the output end of the controller so as to control the opening and closing of the electric control overflow valve and the electric control sequence valve.
5. The electrically controlled proportional variable displacement plunger pump according to claim 4, wherein the output of the controller is configured to send signals to the electrically controlled end of the electrically controlled overflow valve and the electrically controlled end of the electrically controlled sequence valve to set the operating pressures of the electrically controlled overflow valve and the electrically controlled sequence valve.
6. The electrically-controlled proportional variable displacement piston pump according to claim 1, wherein a first damping device is connected in series with a pipeline connecting the output end of the first electrically-controlled valve and the rodless cavity; and a second damping device is connected in series on a pipeline connecting the input end of the second electric control valve and the rodless cavity.
7. The electrically controlled proportioning variable piston pump of claim 6, wherein the first and second damping means are orifice orifices.
8. The electrically-controlled proportional stepless pressure regulating variable plunger pump according to claim 1, wherein the output end of the swash plate type variable plunger pump is connected with a pressure sensor for monitoring the output pressure of the swash plate type variable plunger pump; the pressure sensor is connected with the input end of the controller and transmits an output pressure signal to the controller.
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| CN202011392899.8A CN112594238B (en) | 2020-12-01 | 2020-12-01 | Stepless pressure regulating variable plunger pump with electric control proportion |
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| CN202011392899.8A CN112594238B (en) | 2020-12-01 | 2020-12-01 | Stepless pressure regulating variable plunger pump with electric control proportion |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114753814A (en) * | 2021-12-31 | 2022-07-15 | 中国石油天然气集团有限公司 | Stepless variable pump injection system and related equipment |
| CN116085221A (en) * | 2022-09-09 | 2023-05-09 | 厦门大学 | Digital variable plunger pump with actively adjustable variable speed |
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| US5159812A (en) * | 1989-12-29 | 1992-11-03 | Mannesmann Rexroth Gmbh | Circuitry for controlling control coils of servo devices in a hydraulic system |
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| CN104728195A (en) * | 2015-03-18 | 2015-06-24 | 北京航空航天大学 | Load-sensitive electro-hydrostatic actuator |
| CN204549858U (en) * | 2015-02-16 | 2015-08-12 | 徐工集团工程机械股份有限公司 | Hydraulic efficiency pressure system and hoisting crane |
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| US5159812A (en) * | 1989-12-29 | 1992-11-03 | Mannesmann Rexroth Gmbh | Circuitry for controlling control coils of servo devices in a hydraulic system |
| CN203093089U (en) * | 2013-02-18 | 2013-07-31 | 长沙中联重科环卫机械有限公司 | Hydraulic control system of trash compactor and trash compactor |
| CN204549858U (en) * | 2015-02-16 | 2015-08-12 | 徐工集团工程机械股份有限公司 | Hydraulic efficiency pressure system and hoisting crane |
| CN104728195A (en) * | 2015-03-18 | 2015-06-24 | 北京航空航天大学 | Load-sensitive electro-hydrostatic actuator |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114753814A (en) * | 2021-12-31 | 2022-07-15 | 中国石油天然气集团有限公司 | Stepless variable pump injection system and related equipment |
| CN114753814B (en) * | 2021-12-31 | 2024-04-30 | 中国石油天然气集团有限公司 | Stepless variable pumping system and related equipment |
| CN116085221A (en) * | 2022-09-09 | 2023-05-09 | 厦门大学 | Digital variable plunger pump with actively adjustable variable speed |
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|---|---|
| CN112594238B (en) | 2021-11-02 |
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