Electric control valve of commercial cooking range

Abstract

The utility model discloses an electric control valve of a commercial cooking range. The electric control valve comprises a valve body, an alternating-current permanent magnet synchronous gear motor and a control system. An output shaft of the alternating-current permanent magnet synchronous gear motor is connected with a valve rod of the valve through a connecting device, and a permanent magnet is arranged on the connecting device. The control system comprises a regulation and control unit, a single-chip microcomputer, a relay and a Hall sensor. The relay is electrically connected with the alternating-current permanent magnet synchronous gear motor and drives the alternating-current permanent magnet synchronous gear motor to rotate forwards or reversely according to a control instruction sent by the single chip microcomputer so as to change the rotating angle; a Hall sensor is arranged on a body of the electric control valve in advance, the Hall sensor is used for detecting the position of the permanent magnet, and the Hall sensor is electrically connected with the single-chip microcomputer. The control system zeroing detection circuit has the advantages that non-contact detection of the closing position of the electric valve is achieved, the service life is long, and the failure rate is low; by means of the electric valve angle adjusting circuit, a user can adjust and set any needed angle.

Description

Technical Field

[0001] This utility model relates to the field of commercial kitchen equipment technology, specifically to an electric regulating valve for a commercial stove. Background Technology

[0002] Currently, the adjustment of stove valves in existing technologies is generally done manually. Although manual mechanical valves are simple in design, it is difficult to control the valve opening and the adjustment accuracy is low. It is also difficult to accurately control the air or oil ratio when adjusting large, medium and small flames, making it difficult to guarantee that the emission of any desired large, medium or small flame meets the standards. Utility Model Content

[0003] The purpose of this utility model is to address the shortcomings of existing technologies by providing an electric regulating valve for commercial stoves. This valve enables precise linkage of air or oil for large, medium, and small flames in commercial stoves, ensuring emissions meet standards. It also solves the problem of uncertainty in valve opening angle after a power outage and subsequent power restoration. Furthermore, it addresses the issue of inaccurate manual valve angle adjustment, which prevents precise control of flame size to achieve emissions standards.

[0004] The technical solution is: an electric regulating valve for a commercial stove, including a valve, an AC permanent magnet synchronous geared motor, and a control system;

[0005] The output shaft of the AC permanent magnet synchronous geared motor is connected to the valve stem of the valve via a connecting device, on which a permanent magnet is provided;

[0006] The control system includes a rotary potentiometer (rotary encoder or horizontal sliding potentiometer), related buttons, a microcontroller, a relay, and a Hall sensor. The relay is electrically connected to the AC permanent magnet synchronous geared motor. The relay drives the AC permanent magnet synchronous geared motor to rotate forward or backward according to the control command issued by the microcontroller to change the rotation angle.

[0007] A Hall sensor is pre-installed on the body of the electric regulating valve. The Hall sensor is used to detect the position of the permanent magnet. The Hall sensor is electrically connected to the microcontroller. When the microcontroller is powered off and then powered on again, if the microcontroller cannot detect the feedback signal from the Hall sensor, the microcontroller controls the relay to drive the AC permanent magnet synchronous geared motor to rotate in a preset direction until the permanent magnet is detected and the rotation stops.

[0008] Based on the above technical solution, the control system further optimizes the system by including a control unit that is electrically connected to the microcontroller. The control unit sends control commands to the microcontroller by adjusting the signal value of the control unit. The signal value of the control unit corresponds to the preset energizing time of the relay. Changing the preset energizing time of the relay changes the preset rotation angle of the AC permanent magnet synchronous geared motor.

[0009] Based on the above technical solution, further optimization is made. The control unit is a rotary potentiometer or related button. The microcontroller detects different feedback voltages from the potentiometer or encoder and provides the relay with the corresponding energizing duration according to the different voltages.

[0010] Based on the above technical solution, further optimization was performed, and the microcontroller model is STC8H3K64S2.

[0011] Based on the above technical solution, further optimization is made: the valve is installed on the valve seat, the valve stem is installed through the valve seat, the AC permanent magnet synchronous geared motor is fixedly installed on the valve seat, and the valve stem is concentrically and fixedly connected to the output shaft.

[0012] Based on the above technical solution, the connecting device includes a coupling, and the permanent magnet is fixedly installed on the outside of the coupling. When the valve is fully closed, the permanent magnet is close to and directly facing the Hall sensor.

[0013] Based on the above technical solution, further optimization is made by setting the valve stem perpendicular to the valve seat, providing a sliding groove on the valve seat, installing the Hall sensor in the sliding groove, and allowing the Hall sensor to move within the sliding groove to adjust the detection position of the Hall sensor.

[0014] Based on the above technical solution, further optimization is made. The valve is a needle valve or a gate valve. The connecting device also includes a first fixing screw. The output shaft is fixedly connected to the coupling by the first fixing screw. The valve stem is circumferentially fixedly connected to the coupling. The valve stem can move up and down along the axial direction of the coupling.

[0015] Based on the above technical solution, further optimization is made. The valve is a ball valve, an air valve, or a butterfly valve. The connecting device also includes a first fixing screw or a second fixing screw. The output shaft is fixedly connected to the coupling by the first fixing screw. The valve stem is axially movable to the coupling, or the valve stem is fixedly connected to the coupling by the second fixing screw.

[0016] Based on the above technical solution, a fixed interface is provided around the valve, and the fixed interface is fixedly installed on the valve seat.

[0017] Compared with the prior art, this utility model has the following advantages:

[0018] The design is reasonable. The valve is directly connected to an AC permanent magnet synchronous geared motor via a coupling. The motor is connected to a microcontroller via a relay. The microcontroller is electrically connected to a rotary potentiometer (rotary encoder, horizontal sliding potentiometer) or related buttons. The required opening degree for each position can be preset. When power is restored after a power outage, the microcontroller controls the relay to energize until the permanent magnet rotates to the position of the Hall sensor. The Hall sensor detects the signal from the permanent magnet, and the synchronous motor stops rotating. This is the set valve closing position. When using a ball valve, air valve, or butterfly valve, the axial position of the valve stem is fixed, and the motor output shaft is directly fixed to the valve via a coupling. When using a needle valve or gate valve, the rotation of the needle valve or gate valve will cause the axial position of the valve stem to move up and down. Therefore, the valve stem and coupling are designed to be movable vertically and horizontally, but circumferentially fixed, and the motor output shaft is fixedly connected to the coupling. The valve body is fixedly mounted on the valve seat. A groove is set on the valve seat at the position where the Hall sensor is installed. The width of the groove is larger than the width of the Hall sensor, which allows for fine adjustment of the valve closing position, i.e., the timing of the motor power cut-off when the valve is closed. This device offers flexible control, high valve adjustment precision, and automatic valve closure upon power-up, achieving safe and precise control. It employs an AC permanent magnet synchronous geared motor, significantly reducing manufacturing costs compared to stepper motors and servo motors. Existing technologies using AC permanent magnet synchronous motors can only achieve full opening or full closing of valves, while this device can flexibly control the valve. Combined with a microcontroller control system, it can achieve multiple functions through programming.

[0019] In summary, the controller's zero-return detection circuit enables contactless detection of the electric valve's closed position, resulting in a long service life and low failure rate. The electric valve angle adjustment circuit allows users to adjust the valve to any desired angle. Attached Figure Description

[0020] Figure 1 This is a perspective view of the electric needle valve of this utility model;

[0021] Figure 2 This is a front view of the electric needle valve of this utility model;

[0022] Figure 3 This is a utility model Figure 2 AA sectional view, valve stem not cut;

[0023] Figure 4 This is a utility model Figure 2 AA-sized sectional view, valve stem and coupling are not cut;

[0024] Figure 5 This is a perspective view of the valve seat of this utility model;

[0025] Figure 6 This is a three-dimensional view of the electric air valve of this utility model;

[0026] Figure 7 This is the front view of the electric air valve of this utility model;

[0027] Figure 8 This is a utility model Figure 7 BB section view;

[0028] Figure 9 This is a utility model Figure 7 BB's three-dimensional sectional view, the valve stem is not cut;

[0029] Figure 10 This is a perspective view of the electric ball valve of this utility model;

[0030] Figure 11 This is a three-dimensional sectional view of the electric ball valve of this utility model;

[0031] Figure 12 This is a connection diagram of the control system of this utility model;

[0032] Figure 13 This is the circuit diagram for detecting the valve's return to zero after power failure and re-energization in the control system of this utility model.

[0033] Figure 14 This is a circuit diagram of the potentiometer voltage adjustment and detection circuit of the control system of this utility model;

[0034] Figure 15 This utility model's control system energizes the left-turn relay, triggering a left-turn valve control circuit diagram.

[0035] Figure 16 This utility model's control system energizes the right-turn relay, triggering a valve to turn right.

[0036] Among them, 1. Valve, 11. Valve stem, 12. Fixed interface, 2. Valve seat, 21. Slide groove, 3. AC permanent magnet synchronous geared motor, 31. Output shaft, 41. Coupling, 42. First fixing screw, 43. Second fixing screw, 5. Permanent magnet, 6. Hall sensor. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0038] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0040] An electric regulating valve for a commercial stove includes a valve 1, an AC permanent magnet synchronous geared motor 3, and a control system. The output shaft 31 of the AC permanent magnet synchronous geared motor is connected to the valve stem 11 of the valve via a connecting device, on which a permanent magnet 5 is installed. The control system includes a rotary potentiometer or related buttons, a microcontroller, a relay, and a Hall sensor 6. The relay is electrically connected to the AC permanent magnet synchronous geared motor 3, and drives the AC permanent magnet synchronous geared motor to rotate forward or reverse or change its rotation angle according to the control command issued by the microcontroller. The Hall sensor 6 is pre-installed on the body of the electric regulating valve. The Hall sensor 6 is used to detect the presence of the permanent magnet 5. The Hall sensor 6 is electrically connected to the microcontroller. When the microcontroller is powered off and then powered on again, if the microcontroller does not detect the feedback signal from the Hall sensor 6, the microcontroller controls the relay to drive the AC permanent magnet synchronous geared motor 3 to rotate in a preset direction until the permanent magnet 5 is detected and the rotation stops. The control system also includes a control unit, which is electrically connected to the microcontroller. By adjusting the signal value of the control unit, control commands are sent to the microcontroller. The signal value of the control unit corresponds to a preset energizing duration of the relay. Changing the preset energizing duration of the relay changes the preset rotation angle of the AC permanent magnet synchronous geared motor 3. The control unit can be a rotary potentiometer (rotary encoder, horizontal sliding potentiometer) or related buttons. When the potentiometer or encoder is adjusted, the microcontroller detects different feedback voltages from the potentiometer; different voltages correspond to different energizing durations of the relay. Furthermore, the Hall sensor 6 can also be used as a limit switch. That is, when the rotary potentiometer controls the valve 1 to be fully closed, the microcontroller detects the feedback signal from the Hall sensor 6 and stops supplying power to the relay.

[0041] The microcontroller used above is the STC8H3K64S2, which does not require an external crystal oscillator or external reset. The STC8H series microcontrollers are single-clock / machine-cycle (1T) microcontrollers manufactured by STC. They are a new generation of 8051 microcontrollers with wide voltage range, high speed, high reliability, low power consumption, electrostatic discharge resistance, and strong anti-interference capabilities. The MCU integrates a high-precision R / C clock, which can be set within a wide range of 4MHz to 35MHz during ISP programming, completely eliminating the need for an external crystal oscillator and external reset circuit (an internally integrated high-reliability reset circuit with four selectable reset threshold voltages during ISP programming). The MCU has three selectable clock sources: an internal high-precision IRC clock (adjustable), an internal 32kHz low-speed IRC, and an external 4MHz to 33MHz crystal oscillator or an external clock signal. The user code can freely select the clock source. After selection, the clock signal is divided by an 8-bit divider before being provided to the CPU and various peripherals (such as timers, serial ports, SPI, etc.). The power-down mode can utilize comparator interrupts, low-voltage detection interrupts, power-down wake-up, and timer wake-up. The MCU provides a rich set of digital peripheral interfaces (serial port, timer, advanced PWM, IC, SPI, USB) and analog peripheral interfaces (ultra-high-speed ADC, comparator). These functions of the microcontroller ensure the stable operation of the valve power-down return-to-zero circuit and the valve angle adjustment circuit.

[0042] like Figure 12 , 13 Zero-homing detection circuit and principle:

[0043] To address the problem of uncertainty in the opening angle of valve 1 after a sudden power outage and subsequent power restoration in the control system, this control system incorporates a zero-point detection circuit for the electric valve. Utilizing the principle of magnetic conduction by the Hall sensor 6, the Hall sensor 6 is installed on the valve seat 2 or the outer casing of valve 1, and a permanent magnet 5 is mounted on the shaft of coupling 41. When a sudden power outage is followed by power restoration, valve 1 is not in the closed state, and the microcontroller cannot detect the feedback signal from the Hall sensor 6. The valve-closing relay then operates. When the feedback signal from the Hall sensor 6 is detected, the relay output stops, and valve 1 returns to the closed state.

[0044] like Figure 12 , 14 -16. Valve adjustment angle circuit and principle:

[0045] To address the issue of inaccurate manual adjustment of the oil valve angle and the inability to achieve precise automatic control, this control system incorporates an automatic valve control function. Users can preset the valve angle to achieve precise linkage between airflow or airflow for large, medium, and small flames in commercial stoves. When the user rotates the lever, the lever drives the potentiometer to rotate. The microcontroller detects the feedback voltage from the potentiometer and determines the current lever position. At this point, the microcontroller calculates the duration of the left and right rotation relay engagement based on the user-set valve 1 opening / closing value and the current position change, outputting a PWM signal (0V~5V) to precisely control the valve 1 angle adjustment.

[0046] Potentiometer settings for motor rotation angle:

[0047] The programming needs to be calculated based on the speed ratio of the AC permanent magnet synchronous geared motor 3 and the rotation angle of valve 1 from opening to closing. If the rotation angle of the potentiometer is set to 0-90 degrees (the scale can be set on the potentiometer panel), then 90 degrees corresponds to the microcontroller program setting to output 100% signal magnitude. When the total effective stroke of a needle valve or gate valve from fully closed to fully open is set to 2 rotations (i.e., 720°), the minimum preset value is 0°, corresponding to 0% of the microcontroller output signal (i.e., the valve is fully closed); the maximum preset value is 720°, corresponding to 100% of the microcontroller output signal (i.e., the valve is fully open). When the valve does not need to be fully open or fully closed, the valve opening size corresponding to the size of the microcontroller output signal can be preset arbitrarily during microcontroller programming, which corresponds to the energizing duration of the relay controlled by the internal clock set by the microcontroller. Based on the rotation speed of the geared motor per minute, the energizing duration of the motor per 1° of potentiometer rotation can be calculated. For example, if the geared motor is 30 rpm, then the needle valve (total stroke 2 rotations) in the above example can be energized for 4 seconds to go from fully open (720°) to fully closed (0°), and multiple angles can be set in between. For ball valves and air valves, the total stroke is calculated as 1 / 4 turn (i.e., 90°). A 0% output signal from the microcontroller corresponds to a valve opening of 0°; a 100% output signal from the microcontroller corresponds to a valve opening of 90°. Multiple other settings can also be set as needed, and the valve opening size corresponding to the magnitude of the microcontroller output signal can be preset arbitrarily.

[0048] like Figure 1-11 The implementation of the specific structure of the AC permanent magnet synchronous motor and valve:

[0049] Valve 1 is mounted on valve seat 2, and valve stem 11 is mounted through valve seat 2. AC permanent magnet synchronous geared motor 3 is fixedly mounted on valve seat 2, and valve stem 11 is concentrically and fixedly connected to output shaft 31. The connecting device includes coupling 41, with permanent magnet 5 fixedly mounted on the outside of coupling 41. When valve 1 is fully closed, permanent magnet 5 is close to and directly facing Hall sensor 6. Valve stem 11 is perpendicular to valve seat 2, and valve seat 2 has a slide groove 21. Hall sensor 6 is mounted in slide groove 21 and can move within slide groove 21 to adjust the detection position of Hall sensor 6. Fixed interface 12 is provided around valve 1 and fixedly mounted on valve seat 2.

[0050] When valve 1 is a needle valve or a gate valve, the connecting device also includes a first fixing screw 42. The output shaft 31 and the coupling 41 are fixedly connected by the first fixing screw 42. The valve stem 11 is circumferentially fixedly connected to the coupling 41, and the valve stem 11 can move up and down along the axial direction of the coupling 41.

[0051] When valve 1 is a ball valve, air valve, or butterfly valve, the connecting device further includes a first fixing screw 42 and a second fixing screw 43. The output shaft 31 is fixedly connected to the coupling 41 by the first fixing screw 42, and the valve stem 11 is axially movable to the coupling 41, or the valve stem 11 is fixedly connected to the coupling 41 by the second fixing screw 43.

[0052] When valve 1 uses a needle valve or gate valve, because valve 1 requires circumferential rotation (multiple rotations) to open and close, and valve stem 11 needs to move up and down, relative movement between the motor and the valve is required. When the device is fixed in a certain position, adjusting the opening of valve 1 requires the valve stem 11 to move up and down. When valve 1 uses a ball valve, air valve, or butterfly valve, because valve 1 only requires circumferential rotation (generally 90 degrees) to open and close, and valve stem 11 does not need to move up and down, output shaft 31 and coupling 41 need to be fixed. Valve stem 11 and coupling 41 can be fixed or not. When the microcontroller power is disconnected and then restored, the microcontroller controls motor 3 to rotate, driving coupling 41 to rotate, i.e., permanent magnet 5 to rotate. When the position reached by permanent magnet 5 is detected by Hall sensor 6 (i.e., the position of permanent magnet 5 detected by Hall sensor 6 is equal to the closed position of valve 1), the signal from Hall sensor 6 is transmitted to the microcontroller, which immediately shuts off the power output of the relay.

[0053] Any unmentioned structures and connections are common knowledge.

[0054] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An electric regulating valve for a commercial stove, characterized in that: Includes valves, AC permanent magnet synchronous geared motors, and control systems; The output shaft of the AC permanent magnet synchronous geared motor is connected to the valve stem of the valve via a connecting device, on which a permanent magnet is provided; The control system includes a microcontroller, a relay, and a Hall sensor. The relay is electrically connected to the AC permanent magnet synchronous geared motor. The relay drives the AC permanent magnet synchronous geared motor to rotate forward or backward according to the control command issued by the microcontroller to change the angle of the valve. A Hall sensor is pre-installed on the body of the electric regulating valve. The Hall sensor is used to detect the position of the permanent magnet. The Hall sensor is electrically connected to the microcontroller. When the microcontroller is powered off and then powered on again, if the microcontroller cannot detect the feedback signal from the Hall sensor, the microcontroller controls the relay to drive the AC permanent magnet synchronous geared motor to rotate in a preset direction until the permanent magnet is detected and the rotation stops. When the microcontroller issues a new command, the relay drives the AC permanent magnet synchronous geared motor to rotate to the corresponding angle according to the command.

2. The electric regulating valve for a commercial stove according to claim 1, characterized in that: The control system further includes a control unit, which is electrically connected to the microcontroller. The control unit sends control commands to the microcontroller through the signal value of the control unit. The signal value of the control unit corresponds to the preset energizing time of the relay. Changing the preset energizing time of the relay changes the preset rotation angle of the AC permanent magnet synchronous geared motor.

3. The electric regulating valve for a commercial stove according to claim 2, characterized in that: The control unit is a rotary potentiometer, a push-button switch, a rotary encoder, or a horizontal sliding potentiometer. When the rotary potentiometer is adjusted, the microcontroller detects the voltage feedback from the rotary potentiometer, which corresponds to different energizing durations of the relay, enabling the permanent magnet synchronous geared motor to achieve different rotation angles.

4. The electric regulating valve for a commercial stove according to claim 1, characterized in that: The microcontroller in question is model STC8H3K64S2, which is capable of calculating the energizing time of the relay and resetting the valve after power failure.

5. The electric regulating valve for a commercial stove according to claim 1, characterized in that: The valve is mounted on the valve seat, the valve stem is mounted through the valve seat, the AC permanent magnet synchronous geared motor is fixedly mounted on the valve seat, and the valve stem is concentrically and fixedly connected to the output shaft.

6. The electric regulating valve for a commercial stove according to claim 5, characterized in that: The connecting device includes a coupling, and the permanent magnet is fixedly mounted on the outside of the coupling. When the valve is fully closed, the permanent magnet is close to and directly facing the Hall sensor.

7. The electric regulating valve for a commercial stove according to claim 6, characterized in that: The valve stem is perpendicular to the valve seat, and the valve seat has a sliding groove. The Hall sensor is installed in the sliding groove and can move within the sliding groove to adjust the detection position of the Hall sensor.

8. The electric regulating valve for a commercial stove according to claim 6, characterized in that: The valve is a needle valve or a gate valve. The connecting device also includes a first fixing screw. The output shaft is fixedly connected to the coupling by the first fixing screw. The valve stem is circumferentially fixedly connected to the coupling. The valve stem can move up and down along the axial direction of the coupling.

9. The electric regulating valve for a commercial stove according to claim 6, characterized in that: The valve is a ball valve, a wind valve, or a butterfly valve. The connecting device further includes a first fixing screw or a second fixing screw. The output shaft is fixedly connected to the coupling by the first fixing screw. The valve stem is axially movable to the coupling, or the valve stem is fixedly connected to the coupling by the second fixing screw.

10. The electric regulating valve for a commercial stove according to claim 7, characterized in that: A fixed interface is provided around the valve, and the fixed interface is fixedly installed on the valve seat.

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