Reset control system of electric valve actuator

Abstract

The utility model discloses a reset control system of an electric valve actuator. The reset control system comprises a main control board and a driving motor used for opening and closing a valve. A main control unit is arranged on the main control board and serves as an operation core of the system; the power supply driving unit is connected with an external power supply, converts the external power supply into a power supply for supplying power to the system, detects whether the external power supply is powered off and sends a detection result to the main control unit; the motor control unit receives an instruction of the main control unit and outputs a signal to a driving motor, and the driving motor drives a valve; the energy storage unit is used for storing electric energy and supplying power to the driving motor when the external power supply is powered off, so that the driving motor vibrates and rotates reversely, and the torsional spring is awakened to expand to reset the electric valve actuator. The utility model belongs to the technical field of electric valve resetting, and particularly provides a resetting control system of an electric valve actuator, which is used for solving the problem in the prior art that the electric valve actuator cannot be reset in time due to the fact that the electric valve actuator is stuck due to expansion of a torsional spring during power-off resetting.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric valve reset, and specifically refers to a reset control system for an electric valve actuator. Background Art

[0002] The electric valve actuator is an indispensable actuator in the valve control system, with a large quantity and wide applications. The electric valve actuator includes a driving motor, and the driving motor drives a vertical output shaft through a transmission mechanism. When installed on a valve, the output shaft drives the valve to open and close. Therefore, both the opening and closing of the valve are electrically driven.

[0003] However, in the actual operating environment, there may be a power outage. In the prior art, when there is a power outage, the actuator is reset by the expansion of a reset torsion spring. However, this structure may occasionally get stuck during use, resulting in the actuator not working and reducing its service life. Summary of the Utility Model

[0004] In view of the above situation, in order to overcome the defects of the prior art, the utility model provides a reset control system for an electric valve actuator, which is used to solve the problem that in the prior art, the power-off reset using a torsion spring expansion sometimes gets stuck, resulting in the electric valve actuator being unable to be reset in time.

[0005] The technical solution adopted in this application is as follows:

[0006] This solution provides a reset control system for an electric valve actuator, including a main control board and a driving motor for opening and closing a valve;

[0007] The main control board is provided with:

[0008] A main control unit, which is the core of the system operation;

[0009] A power supply driving unit, which accesses an external power supply and converts it into a power supply for the system, and at the same time detects whether the external power supply is powered off and sends the detection result to the main control unit;

[0010] A motor control unit, which is connected to the main control unit, receives the instruction of the main control unit, outputs a signal to the driving motor, and the driving motor drives the valve;

[0011] An energy storage unit, which is used to store electrical energy and supply power to the driving motor when the external power supply is powered off, so that the driving motor rotates in reverse to reset.

[0012] Further, when the external power supply is powered on, the power supply driving unit converts the external power supply into 5VDC and stores it in the energy storage unit. After the main control unit detects that the power supply driving unit is working, it drives the motor control unit to conduct and controls the driving motor to rotate forward. After the external power supply is powered off, the power supply driving unit stops working. When the main control unit detects the power-off, it uses the power stored in the energy storage unit to conduct the motor control unit, so that the driving motor vibrates and rotates in reverse, wakes up the expansion of the torsion spring, and resets the actuator.

[0013] The beneficial effects obtained by the present utility model adopting the above scheme are as follows:

[0014] A small amount of power is stored in the energy storage unit when powered on, and after power-off, it can drive the motor to rotate in reverse to wake up the torsion spring, thereby resetting the actuator. The above operations make the reset effect more stable and will not cause problems such as carding or crashing due to non-reset, thus greatly improving the service life of the actuator. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the principle of a reset control system for an electric valve actuator provided by this solution;

[0016] Figure 2 It is a schematic diagram of the circuit when the external power supply is alternating current provided by this embodiment;

[0017] Figure 3 It is a schematic diagram of the circuit when the external power supply is direct current provided by this embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model.

[0019] Embodiment 1

[0020] Please refer to Figures 1-3 As shown, this embodiment provides a reset control system for an electric valve actuator, including a main control board and a driving motor for opening and closing the valve. The main control board is provided with:

[0021] A main control unit, which is the core of the system operation;

[0022] A power supply driving unit, which accesses the external power supply and converts it into a power supply for the system, and at the same time detects whether the external power supply is powered off and sends the detection result to the main control unit;

[0023] A motor control unit, which is connected to the main control unit, receives the instruction of the main control unit, outputs a signal to the driving motor, and the driving motor drives the valve;

[0024] The energy storage unit is used to store electrical energy and controls the driving motor to reverse and reset through the motor control unit when the external power supply is cut off.

[0025] As a preferred embodiment, the motor control unit adopts a triode full-bridge drive circuit. The triode full-bridge drive circuit consists of four triodes Q1, Q3, Q5, and Q6 to form an H-bridge. Q1 and Q6 form a diagonal line, and Q3 and Q5 form another diagonal line. The driving motor is connected between the H-bridge through the connection terminals. Q1 and Q3 are PNP, and the emitters of Q1 and Q3 are connected to a 5V voltage. Q5 and Q6 are NPN, and the emitters of Q5 and Q6 are grounded.

[0026] When Q3 and Q5 are conducting, the current flows from the positive pole of the power supply through Q3 from left to right through the driving motor, and then returns to the negative pole of the power supply through Q5, rotating the driving motor clockwise. When the other diagonal line Q1 and Q6 are conducting, the current flows through the driving motor from right to left, thus driving the motor to rotate counterclockwise.

[0027] As a preferred embodiment, the energy storage unit adopts an energy storage capacitor, which is the electrolytic capacitor C2 in the drawing.

[0028] In a further aspect, the power supply drive unit includes a drive chip IC1. The drive chip IC1 is connected to the external power supply. The negative terminal of C2 is connected to the GND terminal of the drive chip IC1, and the positive terminal of C2 is connected to a 5V voltage. The drive chip IC1 is connected to a bidirectional voltage stabilizing diode D5.

[0029] As a preferred embodiment, the main control unit includes a main control chip IC2, and the main control chip IC2 is an MCU micro-control unit.

[0030] As Figure 2 and Figure 3 shown, a capacitor C3 is connected between pin 1 and pin 8 of the main control chip IC2. One end of the capacitor C3 is grounded and the other end is connected to a 5V voltage. The 2nd pin of the main control chip IC2 is connected to the base of Q3 after being in series with a resistor R7. The 3rd pin of the main control chip IC2 is connected to the base of Q4. The collector of Q4 is connected to the collector of Q5 after being in series with a resistor R8. The 4th pin of the main control chip IC2 is connected to the base of Q5 after being in series with a resistor R10. The 5th pin of the main control chip IC2 is grounded after being in series with a capacitor C4, and the 5th pin is connected between the emitters of Q5 and Q6. The 6th pin of the main control chip IC2 is connected to the base of Q2 after being in series with a resistor R6. The collector of Q2 is connected to the base of Q1 after being in series with a resistor R4. The 7th pin of the main control chip IC2 is connected to D5, and the 8th pin of the main control chip IC2 is grounded.

[0031] The principle of the above composition is as follows:

[0032] The power supply driving unit converts the external power supply into 5V DC and stores it in the capacitor C2. When the external power supply is powered on, after the main control chip IC2 detects that the driving chip IC1 is working, it drives Q3 and Q5 to make the driving motor rotate forward. After reaching a certain duration, Q4 conducts and Q5 turns off to maintain the power supply to the driving motor. When the external power supply is cut off, the driving chip IC1 stops working. At this time, after the main control chip IC2 detects the power cut-off, it immediately turns off Q3, Q5, and Q4, and uses the power stored in the capacitor C2 to turn on Q1 and Q6, so that the driving motor vibrates and rotates reversely for a moment, waking up the expansion of the torsion spring to reset the actuator, thereby playing a role in preventing the valve from jamming.

[0033] As an embodiment:

[0034] As Figure 2 shown, when the power supply unit uses an AC power supply, the driving chip IC1 uses an AC-DC driving chip, and the preferred model is the BP85226D chip produced by Shanghai Jingfeng Mingyuan Semiconductor Co., Ltd. 24 - 264Vac is converted into 5VDC through the driving chip IC1 and L1.

[0035] As another embodiment:

[0036] As Figure 3 shown, when the power supply unit uses a DC power supply, the driving chip IC1 uses a DC-DC power chip, and the preferred model is the ME3116AM6G chip produced by Nanjing Weimeng Electronics Co., Ltd. The principle of DC and AC is the same, only the input voltage is different.

[0037] It should be noted that although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, without departing from the purpose of the present invention, without creative design, the structural methods and embodiments similar to this technical solution should all fall within the protection scope of the present invention.

Claims

1. A reset control system for an electric valve actuator, comprising a main control board and a drive motor for opening and closing a valve, characterized in that: The main control board is provided with: The main control unit is the core of the system; The power drive unit is connected to an external power source and converted into a power source for supplying power to the system, and detects whether the external power source is powered off and sends the detection result to the main control unit; A motor control unit is connected to the main control unit, receives instructions from the main control unit, and outputs a signal to the drive motor, and the drive motor drives the valve; The energy storage unit is used to store electrical energy. When the external power supply is cut off, the motor control unit controls the drive motor to reverse and wake up the torsion spring, and the electric valve actuator is reset by expanding the torsion spring.

2. The reset control system of an electric valve actuator according to claim 1, characterized in that: The external power supply adopts an AC power supply or a DC power supply.

3. The reset control system of an electric valve actuator according to claim 2, characterized in that: When the external power supply is supplied, the power drive unit converts the external power supply into 5V DC and stores it in the energy storage unit. After the main control unit detects that the power drive unit is working, the drive motor control unit is turned on and controls the drive motor to rotate forward. After the external power supply is cut off, the power drive unit stops working. When the main control unit detects the power off, the motor control unit is turned on by using the electricity stored in the energy storage unit, so that the drive motor vibrates and reverses, awakening the torsion spring to expand and reset the electric valve actuator.

4. The reset control system of an electric valve actuator according to claim 3, characterized in that: When the external power source adopts a direct current power source, the power drive unit adopts a DC-DC power chip.

5. The reset control system of an electric valve actuator according to claim 4, characterized in that: When the external power source adopts an alternating current power source, the power drive unit adopts an AC-DC drive chip.

6. The reset control system of an electric valve actuator according to claim 1, characterized in that: The energy storage unit adopts an energy storage capacitor.

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