Single-plunger pump for wind turbine braking system

Abstract

The present invention relates to a single plunger pump for a wind turbine brake device, comprising a plunger pump cylinder, a plunger pump piston, and a plunger pump end cover, characterized in that: the plunger pump piston extends out of the plunger pump end cover at one end and is connected to a servo motor drive mechanism, the servo motor drive mechanism is connected to the front end of the plunger pump end cover via an intermediate connector, the rear end of the plunger pump end cover is fixedly connected to the plunger pump cylinder, and the servo motor drive mechanism drives the plunger pump piston to extend and retract in a linear motion within the plunger pump cylinder, thereby changing the volume of the closed cavity between the plunger pump piston and the plunger pump cylinder, thereby completing oil suction and discharge. The present invention uses a servo motor for electrical-mechanical conversion. Compared with the traditional oil supply scheme for the brake device, the single plunger pump uses digital technology for open-loop proportional control, has good linearity, high control accuracy and reliability, and has a simple and compact structure and is easy to use.

Description

Technical Field

[0001] This invention relates to a single-plunger pump, and more particularly to a single-plunger pump for a wind turbine brake device. Background Technology

[0002] The hydraulic control of existing wind turbine braking systems generally adopts a traditional hydraulic circuit control strategy, which consists of a hydraulic pump, accumulator, control valve group, hydraulic pipeline and instrument accessories. This control method is relatively complex. To achieve precise control of the braking system, the configuration of the control valve group is complicated, involving a large number of control valves of various types. It also suffers from drawbacks such as excessive size, inconvenient operation and maintenance, and high maintenance costs. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a single plunger pump for a wind turbine brake device to achieve direct and precise control of the control chamber.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a single plunger pump for a wind turbine brake device, comprising a plunger pump cylinder, a plunger pump piston, and a plunger pump end cover, characterized in that: one end of the plunger pump piston extending out of the plunger pump end cover is connected to a servo motor drive mechanism, the servo motor drive mechanism is connected to the front end of the plunger pump end cover through an intermediate connector, the rear end of the plunger pump end cover is fixedly connected to the plunger pump cylinder, and the servo motor drive mechanism drives the plunger pump piston to extend and retract linearly within the plunger pump cylinder, thereby changing the volume of the closed cavity between the plunger pump piston and the plunger pump cylinder, thus completing oil suction and oil discharge.

[0005] Furthermore, the servo motor drive mechanism consists of a servo motor, a reducer, a ball screw assembly, a guide rod, a cylindrical slider, and an intermediate slider. The servo motor is fixedly connected to the intermediate slider, and the output shaft of the servo motor is connected to the front end of the plunger pump piston through the reducer and a coupling. The intermediate slider is connected to the plunger pump end cover through the cylindrical slider and the guide rod. The rear end of the plunger pump piston is fixedly connected to the lead screw of the ball screw assembly, and the lead screw nut of the ball screw assembly is fixedly connected to the rear part of the plunger pump cylinder.

[0006] Furthermore, a bearing is installed between the intermediate slider and the piston of the plunger pump, and a bearing fixing flange is installed on the end face of the bearing for the installation and fixing of the bearing and the intermediate slider.

[0007] Furthermore, a washer is fixedly connected to the rear end of the ball screw assembly.

[0008] Furthermore, one end of the guide rod is fixedly connected to the plunger pump end cover, and the other end is fixedly connected to the guide rail fixing flange.

[0009] Furthermore, the axes of the servo motor, reducer, piston of the plunger pump, and ball screw assembly coincide with each other.

[0010] Furthermore, the plunger pump end cap is connected to the plunger pump piston via a sealing assembly, which serves to guide and seal the pump end cap and the plunger pump piston.

[0011] Furthermore, the plunger pump end cap is fixedly connected to the bracket.

[0012] Furthermore, the servo motor drive mechanism consists of a servo linear motor, a coupling, and a sliding bearing. The servo linear motor is fixedly connected to the front end face of the plunger pump end cover via an intermediate connector. The linear drive shaft of the servo linear motor is connected to the front end of the plunger pump piston. The intermediate connector and the linear drive shaft are connected via a sliding bearing. The servo linear motor directly drives the plunger pump piston to move linearly.

[0013] Furthermore, a pipe joint, a pressure testing joint, a pressure sensor, and a position sensor are installed at the closed end face of the piston cylinder and piston of the piston pump.

[0014] The beneficial effects of this invention are:

[0015] 1. This plunger pump uses a servo motor for electromechanical-hydraulic conversion. Compared with the existing traditional hydraulic circuit control scheme, the servo motor has better linearity and a larger linear range, making it easier to achieve high-precision open-loop proportional control using digital technology, resulting in a smoother braking and releasing process for the wind turbine brake device;

[0016] 2. This device uses a servo motor, which offers higher reliability. The piston of the plunger pump rotates and moves axially within the cylinder, which helps to form and maintain an oil film in the working clearance and overcomes hydraulic and mechanical clamping forces, thereby improving the overall reliability of the single-plunger pump.

[0017] 3. Because the piston of this single-plunger pump has a small moment of inertia, the braking device can achieve a considerable bandwidth;

[0018] 4. The structure is more compact, operation and maintenance are more convenient, and maintenance costs are lower. Attached Figure Description

[0019] Figure 1 A cross-sectional view of a single-plunger pump structure for a wind turbine braking device in an embodiment of the present invention;

[0020] Figure 2 yes Figure 1 View from direction A;

[0021] Figure 3 yes Figure 1 View B. Detailed Implementation

[0022] To facilitate understanding of the present invention, a more detailed and comprehensive description is provided below, with accompanying drawings illustrating one embodiment. The present invention can be implemented in different forms and is not limited to this embodiment.

[0023] like Figures 1 to 3 As shown, the single plunger pump for a wind turbine brake device of the present invention includes a servo motor 1, a reducer 2, a guide rail fixing flange 3, a guide rod 4, a coupling 5, a flat key 6, an intermediate slider 7, a bearing 8, a plunger pump end cover 9, a plunger pump piston 10, a plunger pump cylinder body one 11, a ball screw assembly 12, a gasket 13, a plunger pump cylinder body two 14, a bracket 15, a cylindrical slider 16, a bearing fixing flange 17, a sealing assembly 18, and an interface 19.

[0024] Servo motor 1 is fixedly connected to intermediate slider 7. The output shaft of servo motor 1 is connected to reducer 2. The output shaft of reducer 2 is connected and fixedly connected to plunger pump piston 10 via coupling 5 and key 6. A bearing 8 is installed between intermediate slider 7 and plunger pump piston 10, and a bearing fixing flange 17 is installed on the end face of bearing 8 for mounting and fixing bearing 8 and intermediate slider 7. Guide rod 4 is connected to intermediate slider 7 via cylindrical slider 16. One end of guide rod 4 is fixedly connected to plunger pump end cover 9, and the other end is fixedly connected to guide rail fixing flange 3. Plunger pump end cover 9 is connected to plunger pump piston 10 via sealing assembly 18, which guides the plunger pump piston 10 and pump end cover 9. The piston pump end cover 9 is fixedly connected to the bracket 15 for sealing; the screw nut in the ball screw assembly 12 is fixedly connected to the piston pump cylinder 11; one end of the ball screw assembly 12 is fixedly connected to the piston pump piston 10, and a gasket 13 is fixedly connected to the other end; the piston pump cylinder 2 14 is fixedly connected to the piston pump cylinder 11; the axes of the servo motor 1, reducer 2, piston pump piston 10 and ball screw assembly 12 are mutually coincident; pipe joints and pressure testing joints 19 are installed at the closed cavity end faces of the piston pump cylinder 2 14 and piston pump piston, and the number and position of joints can be increased or decreased according to customer needs, and pressure sensors, position sensors and other detection devices can be installed.

[0025] When the servo motor 1 drives the reducer 2 to rotate, the ball screw assembly 12 moves axially together with the piston 10 of the plunger pump, and the intermediate slider 7 also moves axially along the guide rod 4. The screw in the ball screw assembly 12 extends and retracts in coordination with the forward and reverse rotation of the servo motor 1, which changes the volume of the closed cavity between the piston 10 of the plunger pump and the piston cylinder 14 of the plunger pump, thus completing the oil suction and discharge.

[0026] When the intermediate slider 7, the plunger pump piston 10 and the lead screw extend together, they are limited by the lead screw nut in the ball screw assembly 12 through the right end of the plunger pump piston 10 contacting the lead screw nut in the ball screw assembly 12.

[0027] When the intermediate slider 7, the plunger pump piston 10, and the lead screw retract together, the gasket 13 contacts the lead screw nut in the ball screw assembly 12 to limit the movement; so that the generated axial and radial forces act on the lead screw nut, preventing the force from being transmitted to other mechanical structures.

[0028] The structural design of this invention is a typical electromechanical-hydraulic integrated mechanism. Through the servo motor and the lead screw transmission mechanism, the volume of the closed cavity between the piston of the plunger pump and the cylinder changes accordingly. At the same time, it drives the intermediate slider to slide along the guide rod, and finally completes the oil suction and discharge. This realizes the direct and precise control of the control cavity of the wind turbine brake device by the servo motor.

[0029] This invention also proposes another technical solution, using a linear motor instead of the aforementioned servo motor, reducer, and ball screw assembly to achieve linear motion. This solution includes a servo linear motor, coupling, and sliding bearing. The servo linear motor is fixedly connected to the front end face of the plunger pump end cover via an intermediate connector. The linear drive shaft of the servo linear motor is connected to the front end of the plunger pump piston, and the intermediate connector and the linear drive shaft are connected via a sliding bearing. The servo linear motor directly drives the plunger pump piston to move linearly.

[0030] The above embodiments only illustrate several examples of the present invention and should not be construed as limiting the patent of the present invention. Based on these embodiments, the novel single-plunger pump of the present invention can be further improved. Therefore, the scope of patent protection of the present invention should be determined by the appended claims.

Claims

1. A single-plunger pump for a wind turbine brake device, comprising a plunger pump cylinder, a plunger pump piston, and a plunger pump end cap, characterized in that: The piston of the plunger pump extends out of the plunger pump end cover and is connected to a servo motor drive mechanism. The servo motor drive mechanism is connected to the front end of the plunger pump end cover via an intermediate connector. The rear end of the plunger pump end cover is fixedly connected to the plunger pump cylinder body. The servo motor drive mechanism consists of a servo motor, a reducer, a ball screw assembly, a guide rod, a cylindrical slider, and an intermediate slider. The servo motor is fixedly connected to the intermediate slider. The output shaft of the servo motor is connected to the front end of the plunger pump piston via a reducer and a coupling. The intermediate slider is connected to the plunger pump end cover via a cylindrical slider and a guide rod. The rear end of the plunger pump piston is fixedly connected to the lead screw of the ball screw assembly. The lead screw nut of the ball screw assembly is fixedly connected to the rear part of the plunger pump cylinder body. The guide rod is fixedly connected at one end to the plunger pump end cover and at the other end to the guide rail fixing flange. The servo motor drive mechanism drives the plunger pump piston to extend and retract linearly within the plunger pump cylinder, thereby changing the volume of the closed cavity between the plunger pump piston and the plunger pump cylinder to complete oil suction and discharge. Simultaneously, it drives the intermediate slider to slide along the guide rod. A washer is fixedly connected to the rear end of the ball screw assembly, which is used to axially limit the radial force by contacting the screw nut during retraction, preventing the radial force from being transmitted to other mechanical structures. The axes of the servo motor, reducer, plunger pump piston, and ball screw assembly coincide with each other, and the plunger pump end cover is connected to the plunger pump piston through a sealing assembly.

2. The single-plunger pump for a wind turbine braking device according to claim 1, characterized in that: A bearing is installed between the intermediate slider and the piston of the plunger pump, and a bearing fixing flange is installed on the end face of the bearing for the installation and fixing of the bearing and the intermediate slider.

3. The single-plunger pump for a wind turbine braking device according to claim 1, characterized in that: The plunger pump end cap is fixedly connected to the bracket.

4. The single-plunger pump for a wind turbine braking device according to claim 1, characterized in that: The piston pump cylinder and piston are equipped with a pipe joint, a pressure testing joint, a pressure sensor, and a position sensor at the closed end face of the piston pump cylinder.

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