Connecting shaft close-fitting type high-precision electric actuator

Abstract

The utility model relates to the field of valves, in particular to a connecting shaft close-fitting type high-precision electric actuator which comprises an electric actuator and a valve body, an actuator output shaft is arranged at the bottom of the electric actuator, and a valve ball core is arranged in the middle of the valve body. The valve actuator connecting frame is arranged at the bottom of the electric actuator; the valve shaft is connected with the valve ball core; and the close-fitting coupler is arranged on the valve actuator connecting frame and is used for connecting the valve shaft and the actuator output shaft. According to the utility model, the torque transmission close to that of a straight stroke valve is realized in a whole-course rigid close-fitting manner. Due to the ultralow cost of the ball valve and the good equal-percentage adjusting characteristic of the W-shaped ball core, the valve can replace a traditional expensive straight stroke adjusting valve in a large scale.

Description

Technical Field

[0001] This utility model relates to the field of valves, and in particular to a high-precision electric actuator with a tight-fitting coupling. Background Technology

[0002] Electric ball valves, which combine a ball valve and an angular stroke actuator, are the most common type of control valve, used in various industries. Their biggest advantages are low cost and simple structure. Currently, they are mostly used for shut-off, and some for coarse adjustment, but cannot be used for high-precision adjustment. This is because the valve and actuator are connected by a loose-fit coupling, which directly affects the angular transmission accuracy between the actuator and the valve. At the same time, the valve stem and valve ball are also loosely fitted, further increasing the connection clearance and affecting the control transmission accuracy. Utility Model Content

[0003] The purpose of this invention is to address the problem in the prior art that it is difficult to achieve high-precision adjustment by combining ball valves and rotary actuators, and to propose a high-precision electric actuator with a tightly coupled shaft.

[0004] The technical solution of this utility model is as follows: A high-precision electric actuator with a tight-fitting coupling, comprising an electric actuator and a valve body, wherein the bottom of the electric actuator is the actuator output shaft, and the middle part of the valve body is the valve ball core; it also includes:

[0005] A valve actuator connection bracket is installed at the bottom of the electric actuator;

[0006] The valve shaft is connected to the valve ball.

[0007] And a tight-fit coupling, which is set on the valve actuator connecting frame, is used to connect the valve shaft and the actuator output shaft.

[0008] Preferably, the electric actuator is equipped with a motor and a gearbox, with the motor output end connected to the gearbox input end, and the gearbox output end driving the actuator output shaft to rotate.

[0009] Preferably, the valve shaft is connected to the valve ball core via a set bolt, thereby achieving a tight connection between the valve shaft and the valve ball core.

[0010] Preferably, an actuator circuit board is installed inside the electric actuator, a magnetic angle chip is installed on the actuator circuit board, and an axial magnet is installed at the top of the actuator output shaft.

[0011] Preferably, it also includes a temperature sensor, which is electrically connected to the electric actuator via a sensor cable, the actuator circuit board is connected to the temperature sensor for data transmission, and the temperature sensor is connected to the valve body.

[0012] Preferably, the tight-fit coupling includes a rear plate and a front plate, which are connected by multiple tight-fit bolts on both sides.

[0013] Preferably, the rear plate of the tight-fitting coupling and the front plate of the tight-fitting coupling are joined together in the middle to form a prismatic hole, and the actuator output shaft and the valve shaft are both square prismatic shafts.

[0014] Compared with existing technologies, this utility model has the following beneficial technical effects: It achieves torque transmission close to that of a linear stroke valve by utilizing a fully rigid, tight-fitting design. The ball valve's ultra-low cost and the excellent equal-percentage adjustment characteristics of its W-shaped ball core enable it to replace traditional, expensive linear stroke control valves on a large scale. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of one embodiment of the present utility model;

[0016] Figure 2 for Figure 1 Diagram of a rigid, tightly fitted connection.

[0017] Figure 3 This is a schematic diagram of the tight-fitting connecting shaft.

[0018] Reference numerals: 1. Electric actuator; 2. Motor; 3. Gearbox; 4. Valve actuator connecting frame; 5. Valve shaft; 6. Valve body; 7. Actuator circuit board; 8. Actuator output shaft; 9. Fitting coupling; 10. Sensor cable; 11. Temperature sensor; 12. Valve ball core; 13. Axial magnet; 14. Magnetic angle chip; 15. Set bolt; 16. Fitting coupling rear plate; 17. Fitting bolt; 18. Fitting coupling front plate. Detailed Implementation

[0019] Example 1

[0020] like Figures 1-3 As shown, this utility model proposes a high-precision electric actuator with a tight-fitting coupling, including an electric actuator 1 and a valve body 6. The bottom of the electric actuator 1 is the actuator output shaft 8, and the middle of the valve body 6 is the valve ball core 12; it also includes:

[0021] Valve actuator connecting bracket 4 is located at the bottom of electric actuator 1;

[0022] The valve shaft 5 is connected to the valve ball core 12. Specifically, the valve shaft 5 is connected to the valve ball core 12 through the set bolt 15 to achieve a tight connection between the valve shaft 5 and the valve ball core 12.

[0023] And a tight-fitting coupling 9, which is set on the valve actuator connecting frame 4, is used to connect the valve shaft 5 and the actuator output shaft 8.

[0024] Example 2

[0025] like Figures 1-2 As shown, this utility model proposes a high-precision electric actuator with a tight-fitting shaft. Compared with Embodiment 1, this embodiment details the structure of the electric actuator 1.

[0026] The electric actuator 1 is equipped with a motor 2 and a gearbox 3. The output end of the motor 2 is connected to the input end of the gearbox 3, and the output end of the gearbox 3 drives the output shaft 8 of the actuator to rotate.

[0027] An actuator circuit board 7 is installed inside the electric actuator 1. A magnetic angle chip 14 is mounted on the actuator circuit board 7. An axial magnet 13 is mounted on the top of the actuator output shaft. The magnetic angle chip 14 is model AS5600, and its working principle is mainly based on magnetoelectric conversion and the Hall effect. It incorporates multiple Hall elements and determines the position and angle of the rotating object by detecting changes in the magnetic field. It uses high-resolution 12-bit analog or PWM output to non-contactly measure minute angle changes of the axial magnet 13. (The last sentence appears to be incomplete and possibly refers to an I / O code.) 2 C-digital communication offers strong anti-interference capabilities. Its robust design eliminates the influence of uniform external stray magnetic fields. Built-in signal processing and dynamic compensation algorithms also help improve measurement accuracy in complex electromagnetic environments. Transmission is accurate and distortion-free, with 12-bit resolution providing 4096 precise position points. When performing 360-degree omnidirectional measurements, the smallest resolvable angle is approximately 0.088° (360° / 4096), achieving a precision subdivision of 1‰. Ultimately, high-precision control is achieved within the 0-90° angle range.

[0028] A temperature sensor 11 is also provided. The temperature sensor 11 is electrically connected to the electric actuator 1 via a sensor cable 10. The actuator circuit board 7 is connected to the temperature sensor 11 for data transmission. The temperature sensor 11 is connected to the valve body 6.

[0029] Example 3

[0030] like Figure 3 As shown, this utility model proposes a high-precision electric actuator with a tight-fitting coupling. Compared with Embodiment 2, this embodiment details the structure of the tight-fitting coupling 9.

[0031] The clamping coupling 9 includes a rear clamping coupling plate 16 and a front clamping coupling plate 18, which are connected by multiple clamping bolts 17 on both sides. The rear clamping coupling plate 16 and the front clamping coupling plate 18 are joined together in the middle to form a prismatic hole. Both the actuator output shaft 8 and the valve shaft 5 are 12.5mm square prismatic shafts, which are simple in structure, high in strength, and easy to process. They can transmit torques exceeding 300 N·m, far exceeding the actual resistance of the valve ball core 12. Both the rear clamping coupling plate 16 and the front clamping coupling plate 18 adopt a semi-circular design with a right-angled inner opening, which fits with the two edges of the square prismatic shaft. With the support of the clamping bolts 17, the maximum clamping force can be achieved, ensuring 100% torque transmission and preventing loosening over a long period of time.

[0032] In summary, this invention enables high-precision control of the angular stroke ball valve. Angle measurement and feedback can be directly transmitted to the valve ball core 12, directly acting on it, greatly eliminating the hysteresis of the ball valve and making its adjustment accuracy approach that of a linear stroke valve. This allows it to largely replace linear stroke control valves. For the first time, a rigid, tight-fitting method throughout the entire stroke is used to achieve torque transmission close to that of a linear stroke valve. The ball valve's ultra-low cost and the excellent equal-percentage adjustment characteristics of the W-shaped ball core enable it to largely replace traditional, expensive linear stroke control valves.

[0033] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A high-precision electric actuator with shaft tight fit, comprising an electric actuator (1) and a valve body (6), the bottom of the electric actuator (1) is an actuator output shaft (8), and the middle of the valve body (6) is a valve ball core (12); characterized in that, Also include: Valve actuator connecting frame (4) is arranged at the bottom of the electric actuator (1); Valve shaft (5) is connected with valve ball core (12); And tight coupling (9) is arranged on the valve actuator connecting frame (4) and is used for connecting the valve shaft (5) and the actuator output shaft (8).

2. The high precision electric actuator of claim 1, wherein, The electric actuator (1) is provided with a motor (2) and a gear box (3), the output end of the motor (2) is connected with the input end of the gear box (3), and the output end of the gear box (3) drives the rotation of the actuator output shaft (8).

3. The high precision electric actuator of claim 1, wherein, The valve shaft (5) is connected with the valve ball core (12) through the tight bolt (15), so that the valve shaft (5) and the valve ball core (12) are tightly connected.

4. The high precision electric actuator of claim 1, wherein, The electric actuator (1) is provided with an actuator circuit board (7), the actuator circuit board (7) is provided with a magnetic angle chip (14), and the top of the actuator output shaft is provided with an axial magnet (13).

5. The high precision electric actuator of claim 4, wherein, Also include temperature sensor (11), temperature sensor (11) through the sensor cable (10) with electric actuator (1) electrically connected, actuator circuit board (7) and temperature sensor (11) data transmission connection, temperature sensor (11) and valve body (6) are connected.

6. The close-coupled high precision electric actuator of claim 1, wherein, The tight coupling (9) includes a tight coupling back plate (16) and a tight coupling front plate (18), and the tight coupling back plate (16) and the tight coupling front plate (18) are connected through a plurality of tight coupling bolts (17) on both sides.

7. The high precision electric actuator of claim 6, wherein, The middle part of the tight coupling back plate (16) and the tight coupling front plate (18) is combined to form a prismatic hole, and the actuator output shaft (8) and the valve shaft (5) are square prismatic shafts.

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