阅读说明：本技术 一种阀控式变量柱塞泵 (Valve control type variable plunger pump ) 是由 沈伟 赵海鸣 潘静娴 李震 陈振豪 于 2021-08-09 设计创作，主要内容包括：本发明属于柱塞泵技术领域,提供了一种阀控式变量柱塞泵,包括泵本体、变量活塞、电控压油阀、斜面位移转换块、位移传感器、斜盘、柱塞以及控制器。控制器可以预先输入控制信信号,通过电控压油阀根据控制变量活塞的位移,变量活塞的运动会带动相连的斜盘的运动,引起斜盘的倾角的改变,斜盘角度一变,就带动柱塞前后运动,实现泵的流量输出。位移传感器与测得纵向位移,可等比例计算出变量活塞的水平位移。再由位移传感器将位移变化转换作为为反馈信号传递给外部控制器,与输入的控制信号相比较,得出偏差信号,控制电控压油阀,从而构成一个闭环位置控制系统,使得排量保持在设定值附近,实现了基于变量活塞位置反馈的闭环排量控制。(The invention belongs to the technical field of plunger pumps, and provides a valve control type variable plunger pump which comprises a pump body, a variable piston, an electric control oil pressure valve, an inclined surface displacement conversion block, a displacement sensor, a swash plate, a plunger and a controller. The controller can input control signals in advance, the movement of the variable piston can drive the connected swash plate to move according to the displacement of the control variable piston through the electric control oil pressing valve, so that the inclination angle of the swash plate is changed, and the plunger is driven to move back and forth when the angle of the swash plate is changed, so that the flow output of the pump is realized. The displacement sensor can measure the longitudinal displacement and calculate the horizontal displacement of the variable piston in equal proportion. And the displacement sensor converts the displacement change into a feedback signal which is transmitted to an external controller, the feedback signal is compared with an input control signal to obtain a deviation signal, and the electric control oil pressure valve is controlled, so that a closed-loop position control system is formed, the displacement is kept near a set value, and the closed-loop displacement control based on variable piston position feedback is realized.)

1. A valve-regulated variable displacement plunger pump, comprising:

a pump body;

the variable piston is positioned in the pump body and is in sliding connection with the pump body;

the electrically controlled oil pressure valve is used for adjusting the displacement of the variable piston;

the inclined displacement conversion block is connected with the top end of the variable piston and is used for converting the horizontal displacement of the variable piston into the longitudinal displacement of the inclined displacement conversion block;

the displacement sensor is contacted with the upper surface of the inclined displacement conversion block and is used for detecting the longitudinal displacement and converting the longitudinal displacement into a feedback signal;

the swash plate is positioned in the pump body, is rotationally connected with the variable piston and synchronously moves under the driving of the variable piston;

the plunger is positioned in the pump body, is connected with the swash plate and is used for synchronously moving under the driving of the swash plate;

and the controller is in communication connection with the displacement sensor and is used for receiving the feedback signal.

2. The valve-regulated variable displacement plunger pump of claim 1, wherein:

wherein the variable piston is rotationally connected with the swash plate through a connecting mechanism, the connecting mechanism comprises a spherical guide seat, a first connecting arm and a second connecting arm,

the spherical guide seat is fixedly connected with the side wall of the variable piston, one end of the first connecting arm is hinged to the spherical guide seat, and the other end of the first connecting arm is hinged to the second connecting arm.

3. The valve-regulated variable displacement plunger pump of claim 2, wherein:

the first connecting arm is an alloy steel block with two hemispherical concave surfaces at two ends.

4. The valve-regulated variable displacement plunger pump of claim 1, further comprising:

a transition plate is arranged on the upper surface of the base plate,

the transition plate is fixed on the pump body and used for mounting the displacement sensor.

5. The valve-regulated variable displacement plunger pump of claim 1, wherein:

wherein, the electric control oil pressure valve is a servo valve FF-106A/103.

6. The valve-regulated variable displacement plunger pump of claim 1, wherein:

wherein, the displacement sensor is an IW-03-01 induction linear displacement sensor.

7. The valve-regulated variable displacement plunger pump of claim 1, wherein:

wherein the upper part of the variable piston is provided with a groove,

the inclined displacement conversion block is a metal wedge-shaped block with the upper part in wedge shape and the lower part in wedge shape matched with the groove of the variable piston.

8. The valve-regulated variable displacement plunger pump of claim 1, wherein:

one end of the swash plate is connected with the pump body through an elastic piece, and the other end of the swash plate is rotatably connected with the variable piston.

9. The valve-regulated variable displacement plunger pump of claim 1, further comprising:

a rotating shaft is arranged on the rotating shaft,

one end of the rotating shaft is fixedly connected with the swash plate, and the plungers are respectively fixedly connected with the swash plate and are uniformly distributed around the rotating shaft along the circumferential direction of the rotating shaft.

Technical Field

The invention belongs to the technical field of plunger pumps, and particularly relates to a valve control type variable plunger pump.

Background

Swash plate plunger pumps are used in a very wide range of industrial markets. The displacement is the most basic function of the variable mechanism, namely, the displacement of the pump is proportional to a control signal by utilizing the position control effect of the variable mechanism, and other control functions are realized based on the function. However, the hydraulic pumps on the market rarely achieve precise control of their own displacement. The existing swash plate type plunger pump generally has the technical problems that the control sensitivity is low, a customer cannot accurately adjust the discharge capacity of the pump according to the use working condition, the inner space of the swash plate type plunger pump is limited, and the like. To obtain accurate displacement, the flow is usually measured by means of an external flow meter, and the displacement is calculated from the flow and the motor speed, and since the motor speed is known, the displacement can be deduced in reverse, which is a convenient, but time-consuming and labor-consuming method.

Disclosure of Invention

The invention is made to solve the above problems, and aims to provide a valve-controlled variable plunger pump capable of accurately measuring the displacement of a swash plate type plunger pump, which solves the technical problems that the conventional swash plate type plunger pump is low in control sensitivity, a customer cannot accurately adjust the displacement of the pump according to the use working condition, the internal space of the swash plate type plunger pump is limited, and the like.

The invention provides a valve-controlled variable displacement plunger pump, which is characterized by comprising the following components: a pump body; the variable piston is positioned in the pump body and is in sliding connection with the pump body; the electrically controlled oil pressure valve is used for adjusting the displacement of the variable piston; the inclined displacement conversion block is connected with the top end of the variable piston and is used for converting the horizontal displacement of the variable piston into the longitudinal displacement of the inclined displacement conversion block; the displacement sensor is contacted with the upper surface of the inclined plane displacement conversion block and is used for detecting the longitudinal displacement of the inclined plane and converting the longitudinal displacement into a feedback signal; the swash plate is positioned in the pump body, is rotationally connected with the variable piston and synchronously moves under the driving of the variable piston; the plunger is positioned in the pump body, is connected with the swash plate and is used for moving under the driving of the swash plate; and the controller is in communication connection with the displacement sensor and is used for receiving the feedback signal.

In the valve-regulated variable displacement plunger pump provided by the invention, the characteristics can be further provided that: the variable piston is rotatably connected with the swash plate through a connecting mechanism, the connecting mechanism comprises a spherical guide seat, a first connecting arm and a second connecting arm, the spherical guide seat is fixedly connected with the side wall of the variable piston, one end of the first connecting arm is hinged with the spherical guide seat, and the other end of the first connecting arm is hinged with the second connecting arm.

In the valve-regulated variable displacement plunger pump provided by the invention, the characteristics can be further provided that: wherein, the first connecting arm is an alloy steel block with two hemispherical concave surfaces.

In the valve-regulated variable displacement plunger pump provided by the present invention, the variable displacement plunger pump may further include: and the transition plate is fixed on the pump body and used for mounting the displacement sensor.

In the valve-regulated variable displacement plunger pump provided by the invention, the characteristics can be further provided that: wherein, the electric control oil pressure valve is a servo valve FF-106A/103.

In the valve-regulated variable displacement plunger pump provided by the invention, the characteristics can be further provided that: wherein, the displacement sensor is an IW-03-01 induction linear displacement sensor.

In the valve-regulated variable displacement plunger pump provided by the invention, the characteristics can be further provided that: the upper part of the variable piston is provided with a groove, the inclined surface displacement conversion block is a metal wedge-shaped block, the upper part of the inclined surface displacement conversion block is wedge-shaped, and the lower part of the inclined surface displacement conversion block is matched with the groove of the variable piston.

In the valve-regulated variable displacement plunger pump provided by the invention, the characteristics can be further provided that: one end of the swash plate is connected with the pump body through an elastic piece, and the other end of the swash plate is rotatably connected with the variable piston.

In the valve-regulated variable displacement plunger pump provided by the present invention, the variable displacement plunger pump may further include: the rotating shaft, wherein, the one end and the sloping cam plate fixed connection of rotating shaft, a plurality of plungers distribute and sloping cam plate fixed connection and along the circumference evenly distributed around the rotating shaft of rotating shaft.

Action and Effect of the invention

According to the valve control type variable plunger pump, the controller can input a control signal in advance, the movement of the variable piston can drive the movement of the connected swash plate to change the inclination angle of the swash plate according to the displacement of the control variable piston through the electric control oil pressing valve, and the plunger is driven to move back and forth when the angle of the swash plate is changed, so that the flow output of the pump can be realized.

The inclined angle of the swash plate is changed by the movement of the variable piston through the connecting mechanism, on the other hand, because the variable piston is connected with the inclined displacement conversion block, when the variable piston moves horizontally, the inclined displacement conversion block is driven to move, so that the upper surface of the inclined displacement conversion block generates longitudinal displacement, and the displacement sensor is contacted with the inclined displacement conversion block, so that the longitudinal displacement can be measured, and the horizontal displacement of the variable piston can be calculated in equal proportion. And then the displacement sensor converts the displacement change into a feedback signal which is transmitted to an external controller, the feedback signal is compared with an input control signal to obtain a deviation signal, and an electrically controlled oil pressure valve is controlled, so that a closed-loop position control system is formed, the displacement of the swash plate type plunger pump is kept near a set value, and the closed-loop displacement control based on variable piston position feedback is realized. In conclusion, the invention has the advantages of simple and compact structure, high control sensitivity and accurate measurement of the displacement of the swash plate type plunger pump.

Drawings

FIG. 1 is a schematic structural view of a pump body in an embodiment of the invention;

FIG. 2 is a left side view of FIG. 1;

FIG. 3 is a schematic view showing the installation relationship of the variable displacement piston, the inclined displacement conversion block, the displacement sensor, the connection mechanism and the swash plate in the embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a bevel displacement conversion block from different perspectives in an embodiment of the present invention;

FIG. 5 is a schematic structural view of a variable displacement piston from different perspectives in an embodiment of the invention;

FIG. 6 is a schematic diagram showing the installation positions of the variable piston, the inclined plane displacement conversion block and the displacement sensor in the embodiment of the present invention; and

fig. 7 is a schematic diagram of the positions of the bevel displacement conversion block and the position sensor during movement in an embodiment of the invention.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the valve-controlled variable plunger pump of the invention is specifically described below with reference to the embodiment and the attached drawings.

< example >

The present embodiment specifically describes the structure of the valve-controlled variable displacement plunger pump.

FIG. 1 is a schematic structural view of a pump body in an embodiment of the invention; FIG. 2 is a left side view of FIG. 1; FIG. 3 is a schematic view showing the installation relationship of the variable displacement piston, the inclined displacement conversion block, the displacement sensor, the connection mechanism and the swash plate in the embodiment of the present invention; FIG. 4 is a schematic structural diagram of a bevel displacement conversion block from different perspectives in an embodiment of the present invention; FIG. 5 is a schematic structural view of a variable displacement piston from different perspectives in an embodiment of the invention; fig. 6 is a schematic view showing the installation position relationship of the variable piston, the inclined plane displacement conversion block and the displacement sensor in the embodiment of the present invention. Wherein only a portion of the pump body is shown in fig. 3; fig. 4 (a), (b), and (c) are front, left, and top views, respectively, of the slant-face displacement conversion block; fig. 5 (a), (b), and (c) are front, left, and top views of the variable piston, respectively.

As shown in fig. 1 to 6, the valve-controlled variable displacement pump includes a pump body 10, a variable piston 20, a slant surface displacement conversion block 30, a displacement sensor 40, a transition plate 50, an electrically controlled oil pressure valve (none of which are shown), a swash plate 60, a plunger (none of which are shown), a link mechanism, a rotary shaft (none of which are shown), and a controller (none of which are shown).

The pump body 10 contains hydraulic oil, and has a variable piston mounting portion 11 and a swash plate and plunger mounting portion 12.

The variable piston 20 is installed at the variable piston installation position 11, the upper end of the variable piston is connected with the variable piston hole on the pump body 10 in a sliding mode, and the rest part of the variable piston is located in the pump body 10 and moves left and right under the pushing of hydraulic pressure.

The variable piston 20 includes a first cylinder 21, a second cylinder 22, and a partition block 23 separating the first cylinder 21 and the second cylinder 22, which are not communicated with each other. The height of the partition block 23 is lower than the height of the first and second cylinders 21 and 22, forming a groove 24.

An electrically controlled oil pressure valve is installed on the pump body 10 for adjusting the displacement of the variable piston 20.

The electrically controlled oil pressing valve is respectively communicated with the corresponding oil passages of the first cylinder body 21 and the second cylinder body 22, and controls the oil supply amount of the oil passages. When the oil amount in the first and second cylinders 21 and 22 changes, the hydraulic pressure changes, and thus the variable piston 20 moves left and right.

The slope displacement conversion block 30 is connected to the top end of the variable piston 20, and converts the horizontal displacement of the variable piston 20 due to the horizontal movement into the longitudinal displacement of its own longitudinal movement.

The inclined displacement conversion block 30 is a metal wedge-shaped block with the upper part thereof in wedge shape and the lower part thereof in wedge shape matched with the groove of the variable piston 20.

The displacement sensor 40 is an IW-03-01 linear induction displacement sensor and is fixedly installed on the pump body 10, and the transition plate 50 is fixed on the pump body.

The bottom end of the displacement sensor 40 is in contact with the upper surface of the inclined displacement conversion block 30, detects the longitudinal displacement of the inclined displacement conversion block 30, and converts the longitudinal displacement into a feedback signal.

The displacement sensor 40 reflects the displacement of the variable displacement piston 20 during displacement calibration, but in actual operation, reflects the displacement of the plunger pump. This is because, in actual operation, after the displacement sensor 40 is mounted, the displacement corresponding to the unit displacement of the displacement sensor 40 is first tested, so that the unit displacement corresponds to the displacement, and thus, the longitudinal displacement of the displacement sensor 40 is reflected as the feedback of the displacement.

The controller is in communication connection with the electric control oil pressure valve and the displacement sensor 40 respectively, can input control signals and also receives feedback signals of the displacement sensor 40.

The swash plate 60 and the plungers are located at the swash plate and plunger mounting position 12 in the pump body.

One end of the swash plate 60 is connected to the pump body 10 through an elastic member, and the other end is rotatably connected to the variable piston 20. In this embodiment, the elastic member is a spring.

The swash plate 60 is rotatably connected to the variable pistons 20 through a connecting mechanism and is driven by the variable pistons 20 to move synchronously. The plunger is fixedly connected with the swash plate 60 and moves under the driving of the swash plate 60.

The connecting mechanism includes a spherical guide seat 71, a first connecting arm 72 and a second connecting arm 73. The first connecting arm 72 is an alloy steel block with two hemispherical concave surfaces at two ends.

The spherical guide seat 71 is fixedly connected with the side wall of the variable piston 20, one end of the first connecting arm 72 is hinged with the spherical guide seat 71, the other end of the first connecting arm is hinged with the second connecting arm 72, and the tail end of the second connecting arm 72 is connected with the swash plate 60.

The rotating shaft is cylindrical, and one end of the rotating shaft is fixedly connected with a swash plate 60. The plurality of plungers are fixedly connected to the swash plate 60 and are uniformly distributed around the rotating shaft in the circumferential direction of the rotating shaft.

When the variable piston 20 moves horizontally, the swash plate 60 is rotationally connected with the variable piston 20 through the connecting mechanism, so that the swash plate 60 is driven to move, and the swash plate tilts a certain angle. The output displacement of the swash plate type plunger pump is changed by controlling the movement of the plunger through the one-to-one correspondence relationship between the positions of the variable pistons 20 and the angles of the swash plate 60.

Fig. 7 is a schematic diagram of the positions of the ramp displacement conversion block and the displacement sensor during movement in an embodiment of the present invention. In fig. 7, (a), (b), and (c) are schematic diagrams of positions of right shift, center shift, and left shift, respectively.

As shown in fig. 3 and 7, when the bottom end of the displacement sensor 40 is located directly above the slope displacement conversion block 30 (see (b) in fig. 7), the reading of the displacement sensor 40 is zero, and the reading of the displacement sensor 40 is a negative number (see (a) in fig. 7) or a positive number (see (c) in fig. 7) as the slope displacement conversion block 30 moves. Therefore, the displacement sensor 40 can be proportionally corresponding to the horizontal displacement of the variable piston 20 by measuring the longitudinal displacement of the inclined displacement conversion block 30, and here, because the response frequency of the displacement sensor 40 is far greater than that of the controller, the displacement sensor 40 can be approximately regarded as a proportional amplifier, the displacement change is converted into a feedback signal and transmitted to the controller, and compared with an input control signal, a deviation signal is obtained to control the electrically controlled oil pressure valve, so that a closed-loop position control system is formed, the displacement of the swash plate type plunger pump is kept near a set value, and the closed-loop displacement control based on the variable piston position feedback is realized.

Effects and effects of the embodiments

According to the valve-controlled variable plunger pump, the controller can input a control signal in advance, the movement of the variable piston can drive the movement of the connected swash plate to change the inclination angle of the swash plate according to the displacement of the control variable piston through the electric control oil pressing valve, and the plunger is driven to move back and forth when the angle of the swash plate is changed, so that the flow output of the pump can be realized.

The inclined angle of the swash plate is changed by the movement of the variable piston through the connecting mechanism, on the other hand, because the variable piston is connected with the inclined displacement conversion block, when the variable piston moves horizontally, the inclined displacement conversion block is driven to move, so that the upper surface of the inclined displacement conversion block generates longitudinal displacement, and the displacement sensor is contacted with the inclined displacement conversion block, so that the longitudinal displacement can be measured, and the horizontal displacement of the variable piston can be calculated in equal proportion. And then the displacement sensor converts the displacement change into a feedback signal which is transmitted to an external controller, the feedback signal is compared with an input control signal to obtain a deviation signal, and an electrically controlled oil pressure valve is controlled, so that a closed-loop position control system is formed, the displacement of the swash plate type plunger pump is kept near a set value, and the closed-loop displacement control based on variable piston position feedback is realized.

The displacement sensor is reasonably arranged on the middle groove of the variable piston, and the displacement sensor can be used for measuring the longitudinal displacement of the inclined displacement conversion block on the premise of not increasing the volume of the pump body, so that the displacement sensor can be used for measuring the horizontal displacement of the variable cylinder in an equal proportion.

The spherical guide seat fixedly connected with the variable piston is connected with the skeleton-like frame connecting seat through the skeleton-like rotating mechanism, and the split connecting structure saves the internal installation space of the pump body. In addition, the split type connecting structure drives the swash plate to rotate, the angle of the swash plate is controlled, the one-to-one correspondence relationship between the positions of the variable cylinders and the angles of the swash plate is obtained, and then the movement of the plunger is controlled, so that the purpose of changing the output displacement of the swash plate type plunger pump is achieved.

The embodiment adopts the improved use of the high-precision servo valve FF-106A/103 to improve the response speed of the plunger pump.

To sum up, this embodiment possesses simple structure compactness, and control sensitivity is high, the advantage of accurate measurement swash plate formula plunger pump discharge capacity.

The above embodiments are preferred examples of the present invention, and are not intended to limit the scope of the present invention.