A servo-driven metering valve

Abstract

This utility model discloses a servo-driven quantitative valve, including a valve body. A connecting seat is disposed on the top of the valve body. A connecting frame is fixedly connected to the end of the connecting seat away from the valve body. A planetary reducer is fixedly connected to the end of the connecting frame away from the connecting seat. A servo motor is disposed at the end of the planetary reducer away from the connecting frame. A motor servo is disposed in the middle of one side of the servo motor. A closed-loop feedback controller is disposed at the end of the servo motor away from the planetary reducer. This utility model incorporates a motor servo and a closed-loop feedback controller. The built-in controller reduces dependence on an external PLC, lowers integration complexity, and achieves precise position and speed control through a feedback loop. Combined with a precision planetary reducer, it can achieve micron-level position control, eliminate accumulated errors, and improve product quality.

Description

Technical Field

[0001] This utility model relates to the field of electric valve technology, and in particular to a servo-driven quantitative valve. Background Technology

[0002] An electric valve is a device that controls the opening and closing of a valve using an electric actuator. It not only performs on / off functions, but regulating electric valves can also adjust the valve position. In the field of industrial automation, electric valves have become a key component due to their advantages of self-control capability, high torque, high precision, and remote control capability.

[0003] Existing electric valves suffer from numerous drawbacks in practical applications. For example, the motor and gearbox in the electric actuator are prone to overheating under frequent start-stop or high-load conditions, leading to frequent thermal protection shutdowns. Worm gear transmission structures suffer from increased transmission clearance due to mechanical wear, resulting in positioning drift after prolonged use. Some products have insufficient redundancy in their reduction mechanisms, potentially causing gear breakage and jamming under extreme conditions. Severe mechanical wear and frequent start-stop cycles shorten lifespan and reduce mean time between failures (MTBF). Position control relies on an open-loop system, lacking real-time feedback, leading to large adjustment errors. For instance, in flow control, the deviation between the target opening and the actual opening can exceed 5%, affecting system stability. When the valve stem and actuator are connected using a keyway structure, shear failure is easily caused under impact loads. Inadequate design of the clearance between the guide sleeve and the valve stem can lead to media crystallization and jamming. Some butterfly valve bearing seats lack grease ports, making maintenance impossible and causing abnormally high rotational torque. Traditional electric valve motors operate under constant torque, resulting in high ineffective power consumption, especially under partial loads. Relevant data shows that the energy loss of traditional valves can account for 10% to 15% of the total system energy consumption. Moreover, the motor has large inertia when starting and stopping, and the response time is often on the order of several seconds, which cannot meet the needs of dynamic processes, such as rapidly changing fluid systems, and there is room for further improvement. Utility Model Content

[0004] The purpose of this invention is to at least solve one of the technical problems existing in the prior art, and to provide a servo-driven quantitative valve. By integrating a servo motor with encoder feedback and a microprocessor closed-loop control system, it effectively makes up for these deficiencies and solves the above-mentioned problems.

[0005] To achieve the above objectives, a servo-driven quantitative valve is provided, comprising a valve body, a connecting seat disposed on the top of the valve body, a connecting frame fixedly connected to the end of the connecting seat away from the valve body, a planetary reducer fixedly connected to the end of the connecting frame away from the connecting seat, a servo motor disposed at the end of the planetary reducer away from the connecting frame, a motor servo disposed in the middle of one side of the servo motor, a closed-loop feedback controller disposed at the end of the servo motor away from the planetary reducer, a coupling disposed at the output end of the planetary reducer, a valve stem fixedly connected to the end of the coupling away from the planetary reducer, and a positioning pointer fixedly connected to the outer side of the end of the valve stem near the coupling.

[0006] According to the aforementioned servo-driven quantitative valve, the servo motor is a commercially available brushless stepper motor, the servo motor is equipped with a soft-start module, and the output end of the servo motor is connected to a planetary reducer.

[0007] According to the aforementioned servo-driven quantitative valve, the rotating shaft between the servo motor and the planetary reducer is integrally connected to the housing of the servo motor and the planetary reducer through a protective housing.

[0008] According to the aforementioned servo-driven quantitative valve, the internal planetary carrier of the planetary reducer is fixedly installed, the output end of the servo motor is fixedly connected to the central wheel of the planetary reducer, and the output shaft of the planetary reducer is fixedly connected to the internal gear ring of the planetary reducer.

[0009] According to the aforementioned servo-driven quantitative valve, the closed-loop feedback controller is electrically connected to the motor servo and is equipped with an encoder feedback module.

[0010] According to the aforementioned servo-driven quantitative valve, the valve body is a rotary ball valve structure, and a spherical valve core is provided inside. A V-shaped groove is provided through one side of the valve core, and the end of the valve stem away from the coupling passes through the connecting seat and is fixedly connected to the valve core.

[0011] According to the aforementioned servo-driven quantitative valve, an oil filling seat is provided at the end of the valve body away from the connecting seat, and a sealing cap is fixedly connected to the outside of the oil filling seat by screws.

[0012] The above solution has at least one of the following beneficial effects:

[0013] 1. This utility model adopts an integrated combination of a servo motor and a planetary reducer to reduce mechanical wear, extend maintenance cycles in harsh environments, and reduce downtime risks. Furthermore, the planetary reducer has the physical characteristics of multi-tooth meshing distributed force transmission, which surpasses existing worm gear reduction mechanisms in terms of torque density, accuracy, rigidity, and efficiency. It resolves the contradiction between high dynamic response and high load capacity, while possessing high torque density and compact structure, low backlash and high positioning accuracy, high rigidity and impact resistance, smooth transmission and low noise, and high transmission efficiency. Moreover, the servo motor can reduce mechanical impact and extend its service life through a soft-start module, enhancing the practicality of the device.

[0014] 2. This utility model is equipped with a motor servo and a closed-loop feedback controller. The built-in controller reduces the dependence on external PLC, reduces integration complexity, and achieves precise position and speed control through the feedback loop. With the help of a precision planetary reducer, it can achieve micron-level position control, eliminate accumulated errors, improve product quality, and enhance the practicality of the device.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0017] Figure 1 This is a front-view diagram of the servo-driven quantitative valve of this utility model.

[0018] Figure 2 This is a top view of the servo-driven quantitative valve of this utility model.

[0019] Figure 3 This is a rear-view structural diagram of a servo-driven quantitative valve according to the present invention.

[0020] Figure 4 This is a top view of the rear structure of a servo-driven quantitative valve according to this utility model.

[0021] Legend:

[0022] 1. Valve body; 2. Connecting seat; 3. Connecting frame; 4. Planetary reducer; 5. Servo motor; 6. Motor servo; 7. Closed-loop feedback controller; 8. Coupling; 9. Valve stem; 10. Positioning pointer; 11. Oil filling seat; 12. Valve core; 13. V-groove. Detailed Implementation

[0023] This section will describe in detail the specific embodiments of the present utility model. Preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present utility model. The drawings are all in a very simplified form and use non-precise proportions. They are only used to help to explain the embodiments of the present utility model in a convenient and clear way, and should not be construed as limiting the scope of protection of the present utility model.

[0024] Reference Figure 1-4 This utility model provides a servo-driven quantitative valve, including a valve body 1. A connecting seat 2 is disposed on the top of the valve body 1. A connecting frame 3 is fixedly connected to the end of the connecting seat 2 away from the valve body 1. A planetary reducer 4 is fixedly connected to the end of the connecting frame 3 away from the connecting seat 2. A servo motor 5 is disposed at the end of the planetary reducer 4 away from the connecting frame 3. The servo motor 5 is a commercially available brushless stepper motor. The servo motor 5 is equipped with a soft start module. The brushless motor and soft start technology can reduce mechanical shock and extend service life. The output end of the servo motor 5 is connected to the planetary reducer 4 for transmission. The planetary reducer 4 contains planetary gears. The frame is fixedly installed. The output end of the servo motor 5 is fixedly connected to the center wheel of the planetary reducer 4. The output shaft of the planetary reducer 4 is fixedly connected to the internal gear ring of the planetary reducer 4. Through high torque density and compact structure, low backlash and high positioning accuracy, high rigidity and impact resistance, smooth transmission and low noise, high transmission efficiency, equipment wear is reduced, lifespan is greatly increased, and failure rate is significantly reduced. The rotating shaft between the servo motor 5 and the planetary reducer 4 is integrated with the housing of the servo motor 5 and the planetary reducer 4 through a protective housing. The integrated combination reduces mechanical wear, extends the maintenance cycle in harsh environments, and reduces the risk of downtime.

[0025] A motor servo 6 is located in the middle of one side of the servo motor 5. A closed-loop feedback controller 7 is located at the end of the servo motor 5 away from the planetary reducer 4. The closed-loop feedback controller 7 is electrically connected to the motor servo 6 and is equipped with an encoder feedback module. The servo system can control the adjustment error within 0.1% through real-time position feedback such as encoder signals. Precise position and speed control is achieved through the feedback loop. The formula is expressed as τ=Kpe+Ki∫edt+Kddtde, where τ is the output torque, e is the error signal, and Kp, Ki, and Kd are PID parameters. This ensures that the system can still operate stably under disturbances and has high dynamic characteristics. The response time can be shortened to the millisecond level, such as <100ms. The opening degree can be adjusted in real time to avoid overshoot or oscillation, ensure the dynamic balance of the system, adapt to high-frequency changing working conditions, and output torque only when needed. This realizes "on-demand power supply" and "intelligent sleep" modes to reduce idle power consumption. The energy consumption is reduced by 20% to 30% compared with traditional valves, saving operating costs.

[0026] The output end of the planetary reducer 4 is equipped with a coupling 8. A valve stem 9 is fixedly connected to the end of the coupling 8 furthest from the planetary reducer 4. The coupling 8 efficiently transmits torque, facilitating installation and maintenance, and compensating for shaft misalignment to adapt to various working conditions. The valve body 1 is a rotary ball valve structure with a spherical valve core 12 inside. A V-groove 13 is formed through one side of the valve core 12. The end of the valve stem 9 furthest from the coupling 8 passes through the connecting seat 2 and is fixedly connected to the valve core 12. The V-type ball valve is particularly suitable for applications requiring precise control of flow and pressure. In applications such as the flow formula Q=CvΔP, where Q represents the flow rate, Cv is the flow coefficient, and ΔP is the pressure difference, the servo valve can precisely adjust the Cv value to ensure flow stability. It has good regulating performance, and it can open and close quickly, is easy to operate, has a long wear resistance and service life, and is widely applicable. A positioning pointer 10 is fixedly connected to the outer side of the valve stem 9 near the coupling 8. An oil filling seat 11 is provided at the end of the valve body 1 away from the connecting seat 2. A sealing cover is fixedly connected to the outer side of the oil filling seat 11 by screws for easy maintenance.

[0027] Working Principle: This invention reduces mechanical wear by employing an integrated combination of a servo motor 5 and a planetary reducer 4, extending maintenance cycles and reducing downtime risks in harsh environments. The planetary reducer 4 possesses multi-tooth meshing distributed force transmission characteristics, resolving the contradiction between high dynamic response and high load capacity compared to existing worm gear reduction mechanisms. It also features high torque density and a compact structure, low backlash and high positioning accuracy, high rigidity and impact resistance, smooth transmission and low noise, and high transmission efficiency. Furthermore, the servo motor can reduce mechanical impact and extend its service life through a soft-start module. Simultaneously, a motor servo 6 and a closed-loop feedback controller 7 are incorporated, reducing reliance on external PLCs and lowering integration complexity. The closed-loop feedback controller 7 achieves precise position and speed control through a feedback loop, which, combined with the precision planetary reducer 4, enables micron-level position control, eliminating accumulated errors and improving product quality.

[0028] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A servo-driven metering valve, comprising a valve body (1), characterized in that: A connecting seat (2) is provided above the valve body (1). A connecting frame (3) is fixedly connected to the end of the connecting seat (2) away from the valve body (1). A planetary reducer (4) is fixedly connected to the end of the connecting frame (3) away from the connecting seat (2). A servo motor (5) is provided at the end of the planetary reducer (4) away from the connecting frame (3). A motor servo (6) is provided in the middle of one side of the servo motor (5). A closed-loop feedback controller (7) is provided at the end of the servo motor (5) away from the planetary reducer (4). A coupling (8) is provided at the output end of the planetary reducer (4). A valve stem (9) is fixedly connected to the end of the coupling (8) away from the planetary reducer (4). A positioning pointer (10) is fixedly connected to the outer side of the end of the valve stem (9) near the coupling (8).

2. The servo-driven metering valve according to claim 1, characterized in that, The servo motor (5) is a brushless stepper motor that is already available on the market. The servo motor (5) is equipped with a soft start module. The output end of the servo motor (5) is connected to the planetary reducer (4) for transmission.

3. A servo-driven metering valve according to claim 1, characterized in that, The rotating shaft between the servo motor (5) and the planetary reducer (4) is integrally connected to the housing of the servo motor (5) and the planetary reducer (4) through a protective housing.

4. A servo-driven metering valve according to claim 1, characterized in that, The planetary carrier inside the planetary reducer (4) is fixedly installed. The output end of the servo motor (5) is fixedly connected to the center wheel of the planetary reducer (4). The output shaft of the planetary reducer (4) is fixedly connected to the internal gear ring of the planetary reducer (4).

5. A servo-driven metering valve according to claim 1, characterized in that, The closed-loop feedback controller (7) is electrically connected to the motor servo (6) and is equipped with an encoder feedback module.

6. A servo-driven metering valve according to claim 1, characterized in that, The valve body (1) is a rotating ball valve structure, and a spherical valve core (12) is provided inside. A V-shaped groove (13) is provided through one side of the valve core (12). The end of the valve stem (9) away from the coupling (8) passes through the connecting seat (2) and is fixedly connected to the valve core (12).

7. A servo-driven metering valve according to claim 1, characterized in that, The valve body (1) is provided with an oil injection seat (11) at one end away from the connecting seat (2), and a sealing cover is fixedly connected to the outside of the oil injection seat (11) by screws.

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