Electric hydraulic valve based on stepping motor

Abstract

In order to solve the problem that an existing electric water valve is difficult to recover to a designated position after a power failure fault, and hidden dangers are generated, the utility model provides an electric hydraulic valve based on a stepping motor, which comprises the stepping motor and a valve body, the stepping motor is in transmission connection with the valve body, and the motor controls a piston in the valve body to move; the system further comprises a control circuit part. The control circuit part comprises a main control circuit, a communication circuit, a power supply circuit and a motor driving circuit; wherein the power supply circuit is connected with the main control circuit; the communication circuit is connected with the main control circuit; the motor driving circuit is connected with the main control circuit, and the motor driving circuit is also connected with the stepping motor; an electric energy storage element used for helping the stepping motor to return to a set position is also arranged in the motor driving circuit; the electric energy storage element is also connected with the power supply circuit; the piston in the valve body is helped to move to a designated position after power failure, and safety is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric valve technical field especially based on stepping motor's electric hydraulic valve. BACKGROUND

[0002] Electric valve as a kind of electric actuating control valve is widely used in pipeline liquid transmission.Electric valve usually includes electric actuating mechanism and valve two parts, electric actuating mechanism is controlled by gear cooperation, the movement of valve, realize the on-off control of pipeline or switching between different pipelines, such as the content shown in the patent with the publication number US2023 / 0375015A1, the patent discloses the structure of piston valve movement driven by motor, to realize the communication and switching between different pipelines.But in the existing electric valve, when the valve stops unexpectedly, the piston in its interior and pipeline structure usually stop in the state of power failure, it will affect the whole pipeline, such as the equipment is stopped because of accidental power failure, and electric valve does not cut off pipeline in time, leading to continue to transport solution, cause waste.Therefore, a kind of electric hydraulic valve capable of power-off reset is needed. SUMMARY

[0003] The utility model aims at solving the insufficient of prior art, provide a kind of based on stepping motor's electric hydraulic valve.

[0004] To solve the above problems, the utility model adopts the following scheme:

[0005] A kind of based on stepping motor's electric hydraulic valve, including stepping motor and valve body, wherein stepping motor is drivingly connected with valve body, motor controls the movement of piston in valve body;Further including control circuit part;Control circuit part includes main control circuit, communication circuit, power supply circuit and motor drive circuit;Wherein power supply circuit is connected with main control circuit, for main control circuit and other circuit power supply;Communication circuit is connected with main control circuit, for realizing remote communication operation;Motor drive circuit is connected with main control circuit, motor drive circuit is also connected with stepping motor, for controlling the bidirectional rotation of stepping motor;Motor drive circuit is also provided with the electric energy storage element for helping stepping motor to return to set position in it;Electric energy storage element is also connected with power supply circuit.

[0006] Further, the electric energy storage element is a large-capacity energy storage capacitor.

[0007] Further, the stepping motor is a two-phase stepping motor, and the corresponding motor drive circuit includes a first drive circuit and a second drive circuit;The first drive circuit and the second drive circuit are connected with the main control circuit respectively, and the first drive circuit and the second drive circuit are also connected with the stepping motor respectively;The first drive circuit and the second drive circuit are also respectively provided with the electric energy storage element.

[0008] Further, the communication circuit comprises a Modbus RTU communication protocol circuit and a CAN communication protocol circuit.

[0009] Further, the Modbus RTU communication protocol circuit comprises a MAX485ESA communication chip, and the CAN communication protocol circuit comprises an HMT1040T communication chip.

[0010] Further, the control circuit further comprises a switching circuit; the switching circuit comprises a resistor R35, a resistor R36 and a switch SW1; one end of the switch SW1 is grounded, the other end is connected between the resistor R35 and the resistor R36, the resistor R35 is further connected with the power supply circuit, and the resistor R36 is further connected with a switch pin in the main control circuit.

[0011] Further, the power supply circuit comprises a voltage stabilizing chip, and the voltage stabilizing output value of the voltage stabilizing chip is 5V, and the input value of the voltage stabilizing chip is 24V.

[0012] Further, the first driving circuit comprises a driving chip IC1, an energy storage capacitor and a filter capacitor; wherein the output control pins of the driving chip IC1 are connected with the main control circuit respectively; the positive pole of the energy storage capacitor is connected with the voltage line of 24V in the power supply circuit and the motor voltage control pin in the driving chip IC1 respectively; the energy storage capacitor is further connected with the filter capacitor; and the output pins of the driving chip IC1 are connected with the stepping motor respectively.

[0013] Further, the driving chip IC1 in the first driving circuit adopts an integrated chip TB67H451.

[0014] Further, the 4th pin of the driving chip IC1 is connected with the 5V output of the power supply circuit, the 7th pin of the driving chip IC1 is connected with the ground after a 250 milliohm resistor, and the maximum working current of the stepping motor is limited to 2A.

[0015] The utility model discloses the beneficial effects are:

[0016] By setting the electric energy storage element for power supply in the emergency in the control circuit, the stepping motor and the control circuit are provided with power after power failure, the stepping motor is helped to control the piston to move to the specified state, and the equipment damage or other losses caused by emergency power failure or the like are avoided.

[0017] By setting the communication circuit in the control circuit, the action of the stepping motor can be remotely controlled, and the working condition of the stepping motor, such as the rotating angle and the like, can be known.

[0018] By setting two integrated chips TB67H451 as the driver chips for the stepper motor, the stepper motor can be driven to complete forward and reverse rotation. On the other hand, the operating current, operating voltage and other parameters of the stepper motor can be limited to ensure stable operation of the stepper motor. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of Example 1;

[0020] Figure 2 This is a schematic diagram of the main control circuit of the control circuit section in Example 1;

[0021] Figure 3 This is a schematic diagram of the Modbus RTU communication protocol circuit of the communication circuit in Example 1.

[0022] Figure 4 The CAN communication protocol circuit of Example 1

[0023] Figure 5 This is a schematic diagram of the communication circuit wiring terminals in Example 1;

[0024] Figure 6 This is a schematic diagram of the first drive circuit of the control circuit section in Embodiment 1;

[0025] Figure 7 This is a schematic diagram of the second drive circuit of the control circuit section in Embodiment 1;

[0026] Figure 8 This is a schematic diagram of the power supply circuit for the control circuit section of Example 1;

[0027] Figure 9 This is a schematic diagram of the wiring terminals of the power supply circuit in Example 1;

[0028] Figure 10 This is a schematic diagram of the switching circuit for the control circuit section of Example 1;

[0029] Figure 11 This is a schematic diagram of the power supply self-test circuit of the control circuit section in Example 1.

[0030] The attached diagram shows the following labels: Stepper motor 1, Valve body 2, Inlet 21, Outlet 22. Detailed Implementation

[0031] The advantages and effects of the present application can be easily understood by those skilled in the art from the content disclosed in the present specification. The present application can also be implemented or applied through other different specific embodiments, and the details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0032] It should be noted that the diagrams provided in the following embodiments only schematically illustrate the basic concept of the present application, and only show the components related to the present application in the diagrams, not the number, shape and size of the components when actually implemented. The shape, number and proportion of each component when actually implemented can be arbitrarily changed, and the component layout pattern can also be more complex.

[0033] Embodiment 1:

[0034] As Figures 1-11As shown, an electric hydraulic valve based on a stepper motor 1, comprising a stepper motor 1 and a valve body 2, wherein the stepper motor 1 is in transmission connection with the valve body 2, and the motor controls the reciprocating movement of the piston in the valve body 2. In this example, a two-phase four-wire stepper motor 1 is used, which has A and B phases, and each phase has positive and negative electrodes. By sequentially energizing the A and B phases, the forward or reverse rotation of the stepper motor 1 can be controlled. The electric hydraulic valve also includes a control circuit part; wherein the valve body 2 is provided with a water inlet 21 and two water outlets 22, and when the piston moves inside the valve body 2, the water inlet 21 is disconnected from the two water outlets 22 or connected to at least one of the two water outlets 22; it also includes a control circuit part; the control circuit part includes a main control circuit, a communication circuit, a power supply circuit, a first drive circuit and a second drive circuit; wherein the power supply circuit is connected with the main control circuit, used for power supply of the main control circuit and other circuits, it is necessary to point out that the power supply circuit is also connected with the external power supply, and the power supply uses a separate battery pack or an adapter connected to the power grid; the communication circuit is connected with the main control circuit, used for realizing remote communication operation, it is necessary to point out that the communication circuit can use wireless communication or wired communication; the first drive circuit and the second drive circuit are respectively connected with the main control circuit, and the first drive circuit and the second drive circuit are also respectively connected with the stepper motor 1, wherein the first drive circuit is used for controlling the stepper motor 1 to rotate in one direction, and the second drive circuit controls the stepper motor 1 to rotate in the other direction, realizing the bidirectional rotation of the stepper motor 1; the first drive circuit and the second drive circuit are also respectively provided with an electric energy storage element for helping the stepper motor 1 to return to the set position, and the electric energy storage element is also connected with the power supply circuit; in normal state, the electric energy storage element is charged by the power supply circuit, and when the control circuit stops due to power failure, the electric energy storage element releases the stored electric energy to supply power to the motor drive circuit, and through the power supply circuit, the other circuit parts in the control circuit are supplied with power, helping the stepper motor 1 to rotate to the set angle, wherein because of the characteristics of the rotating movement of the stepper motor 1, the position of the piston in the valve body 2 can be more accurately controlled.

[0035] The main control circuit uses LKS077 chip produced by Lingouchuangxin as the main control chip U3, which has 24 pins; wherein pin No. 20 is used as the power input pin and is connected with the power supply circuit, and pin No. 19 is grounded.

[0036] The communication circuit comprises a Modbus RTU communication protocol circuit and a CAN communication protocol circuit; the Modbus RTU communication protocol circuit comprises a MAX485ESA communication chip; and the CAN communication protocol circuit comprises an HMT1040T communication chip. Specifically, a pin No. 1 of the MAX485ESA communication chip U1 in the Modbus RTU communication protocol circuit is connected to a pin No. 1 of a main control chip U3 through a 100Ω resistor; a pin No. 4 of the communication chip U1 is connected to a pin No. 2 of the main control chip U3; the pin No. 1 and the pin No. 2 of the main control chip U3 are used as the pins for sending and receiving data in RS-485 communication; a pin No. 2 of the communication chip U1 is connected to a pin No. 3 of the main control chip U3 through a transistor Q1; the pin No. 2 of the communication chip U1 is also connected to an output of a power supply circuit through a resistor R1; in this example, the voltage output by the power supply circuit is 5V; a pin No. 8 of the communication chip U1 is also connected to the output of the power supply circuit; a pin No. 5 of the communication chip U1 is grounded; a pin No. 6 and a pin No. 7 of the communication chip U1 are connected to external data transmission lines through a terminal; the pin No. 6 of the communication chip U1 is also connected to the output of the power supply circuit through a resistor R8; and the pin No. 7 of the communication chip U1 is also grounded through a resistor R2. The CAN communication protocol circuit comprises a pin No. 1 and a pin No. 4 of an HMT1040T communication chip U2, which are connected to a pin No. 14 and a pin No. 15 of the main control chip U3 respectively and used as communication pins; a pin No. 2 of the communication chip U2 is grounded; a pin No. 3 of the communication chip U2 is connected to the output of the power supply circuit; a pin No. 5 of the communication chip U2 is grounded through a resistor R11 and a capacitor C2; a pin No. 6 of the communication chip U2 is grounded through a resistor R10 and a capacitor C2; a pin No. 7 of the communication chip U2 is grounded through a resistor R9 and a capacitor C2; the pin No. 6 of the communication chip U2 is also connected to a grounded TVS diode D2; the pin No. 7 of the communication chip U2 is also connected to a grounded TVS diode D1; and a pin No. 8 of the communication chip U2 is grounded through a capacitor C1.

[0037] The control circuit further comprises a switch circuit; the switch circuit comprises a resistor R35, a resistor R36 and a switch SW1; one end of the switch SW1 is grounded, the other end is connected between the resistor R35 and the resistor R36, the resistor R35 is further connected to the power supply circuit, and the resistor R36 is further connected to a switch pin No. 21 of the main control chip U3 in the main control circuit. When the switch SW1 is turned on, the resistor R36 is grounded, and at this time, the pin No. 21 of the main control chip is at a low potential; when the switch SW1 is turned off, the resistor R36 is in communication with the resistor R35, and at this time, the pin No. 21 is at a high potential, so as to be awakened and realize the switching of the main control chip U3.

[0038] The power supply circuit includes a voltage stabilizing chip U4, the voltage stabilizing output value of the voltage stabilizing chip is 5V, and the input value of the voltage stabilizing chip is 24V. In this example, the voltage stabilizing chip adopts an L78M05 chip, and capacitors C9, C10 and C11, C12 connected in parallel and grounded are arranged at the input end and the output end of the voltage stabilizing chip U4, as filter capacitors. A reverse prevention diode D3 is further arranged between the input end of the voltage stabilizing chip U4 and the power supply terminal, and the diode D3 is of the S5M type; meanwhile, an energy storage element is also connected between the reverse prevention diode D3 and the voltage stabilizing chip U4 for preventing the current from flowing to the power supply terminal direction when the energy storage element is discharged, and damaging the external power supply.

[0039] The energy storage element is a large-capacity energy storage capacitor, which is 3300UF-35V in this example, and can accommodate a maximum charging voltage of 35V, thus meeting the 24V discharge requirement in this example.

[0040] The first driving circuit includes a driving chip IC1, an energy storage capacitor and a filter capacitor; wherein the driving chip IC1 in the first driving circuit adopts an integrated chip TB67H451; the output control pins of the driving chip IC1 are connected with the main control circuit respectively; the positive pole of the energy storage capacitor is connected with the 24V voltage line in the power supply circuit and the motor voltage control pin in the driving chip IC1 respectively; the energy storage capacitor is further connected with the filter capacitor; the output pins of the driving chip IC1 are connected with the stepper motor 1 respectively. The pin 4 of the driving chip IC1 is connected with the 5V output of the power supply circuit, the pin 7 of the driving chip IC1 is connected with the 250 milliohm resistor R19 and then grounded, and the maximum working current of the stepper motor 1 is limited to 2A. The structure of the second driving circuit is similar, and the difference lies in that the input and output of the operational amplifier 2 in the main control chip U3 are further connected in the first driving circuit, wherein the pin 9 of the main control chip U3 is connected with one end of the resistor R15 and the resistor R19, the pin 10 of the main control chip U3 is connected with the other end of the resistor R19 through the resistor R16; and the capacitor C6 for isolation is further arranged between the pin 9 and the pin 10 of the main control chip U3.

[0041] The power supply self-checking circuit further includes a power supply terminal in the power supply circuit connected with the 10KΩ resistor R17 and the 1KΩ resistor R20 in series and then grounded, and the capacitor C13 is further arranged in parallel at both ends of the resistor R20; wherein the end of the resistor R20 close to the resistor R17 is further connected with the pin 24 of the main control chip U3 as a voltage detection port, and when the voltage of the part reaches a set voltage value, it is considered that the input voltage of the power supply meets the requirements.

[0042] In the implementation process, by setting the electric energy storage element for power supply in emergency in the control circuit, power is provided for the step motor 1 and the control circuit after power failure, helping the step motor 1 to control the piston to move to the specified state, usually the initial state, avoiding equipment damage or other losses caused by emergency power failure and the like; by setting the communication circuit in the control circuit, the action of the step motor 1 can be remotely controlled, and the working condition of the step motor 1, such as the rotation angle and the like, can also be known; by setting two integrated chips TB67H451 as the driving chip of the step motor 1, on the one hand, the step motor 1 can be driven to complete the actions of forward rotation and reverse rotation, and on the other hand, the working current, working voltage and the like of the step motor 1 can be limited, ensuring the stable operation of the step motor 1.

[0043] The above description is only one specific example of the present application and does not constitute any limitation on the present application. Obviously, for those skilled in the art, after understanding the content and principle of the present application, various modifications and changes in form and details can be made without departing from the principle and structure of the present application, but these modifications and changes based on the idea of the present application are still within the protection scope of the claims of the present application.

Claims

1. An electro-hydraulic valve based on a stepper motor (1) comprising a stepper motor (1) and a valve body (2), wherein the stepper motor (1) is in driving connection with the valve body (2) and the motor controls the movement of a piston within the valve body (2); characterized in that, The control circuit part comprises a main control circuit, a communication circuit, a power supply circuit and a motor driving circuit; the power supply circuit is connected with the main control circuit and is used for supplying power for the main control circuit and other circuits; the communication circuit is connected with the main control circuit and is used for realizing remote communication operation; the motor driving circuit is connected with the main control circuit and is also connected with the stepping motor (1) and is used for controlling bidirectional rotation of the stepping motor (1); the motor driving circuit is further provided with an electric energy storage element used for helping the stepping motor (1) to return to a set position; the electric energy storage element is also connected with the power supply circuit.

2. An electro-hydraulic valve based on a stepper motor (1) according to claim 1, characterized in that, The electric energy storage element is a large-capacity energy storage capacitor.

3. An electro-hydraulic valve based on a stepper motor (1) according to claim 2, characterized in that The stepping motor (1) adopts a two-phase stepping motor (1), and the corresponding motor driving circuit comprises a first driving circuit and a second driving circuit; the first driving circuit and the second driving circuit are respectively connected with the main control circuit, and the first driving circuit and the second driving circuit are also respectively connected with the stepping motor (1); the first driving circuit and the second driving circuit are further respectively provided with electric energy storage elements.

4. An electro-hydraulic valve based on a stepper motor (1) according to claim 1, characterized in that, The communication circuit comprises a Modbus RTU communication protocol circuit and a CAN communication protocol circuit.

5. An electro-hydraulic valve based on a stepper motor (1) according to claim 4, characterized in that, The Modbus RTU communication protocol circuit comprises a MAX485ESA communication chip, and the CAN communication protocol circuit comprises a HMT1040T communication chip.

6. An electro-hydraulic valve based on a stepper motor (1) according to claim 1, characterized in that, The control circuit further comprises a switching circuit; the switching circuit comprises a resistor R35, a resistor R36 and a switch SW1; one end of the switch SW1 is grounded, and the other end is connected between the resistor R35 and the resistor R36; the resistor R35 is further connected with the power supply circuit, and the resistor R36 is further connected with a switch pin in the main control circuit.

7. An electro-hydraulic valve based on a stepper motor (1) according to claim 3, characterized in that, The power supply circuit comprises a voltage stabilizing chip, the voltage stabilizing output value of the voltage stabilizing chip is 5V, and the input value of the voltage stabilizing chip is 24V.

8. An electro-hydraulic valve based on a stepper motor (1) according to claim 7, characterized in that The first driving circuit comprises a driving chip IC1, an energy storage capacitor and a filter capacitor; the output control pins of the driving chip IC1 are respectively connected with the main control circuit; the positive pole of the energy storage capacitor is connected with a 24V voltage line in the power supply circuit and a motor voltage control pin in the driving chip IC1; the energy storage capacitor is further connected with the filter capacitor; the output pins of the driving chip IC1 are respectively connected with the stepping motor (1).

9. An electro-hydraulic valve based on a stepper motor (1) according to claim 8, characterized in that The driving chip IC1 in the first driving circuit adopts an integrated chip TB67H451.

10. An electro-hydraulic valve based on a stepper motor (1) according to claim 9, characterized in that The 4th pin of the driving chip IC1 is connected with the 5V output of the power supply circuit, the 7th pin of the driving chip IC1 is connected with a 250 milliohm resistor and then grounded, and the maximum working current of the stepping motor (1) is limited to 2A.

Images