Automatic control pressure maintaining control circuit of electric butterfly valve

Abstract

The utility model relates to a self-control pressure maintaining control circuit of an electric butterfly valve. The self-control pressure maintaining control circuit comprises a storage battery, a power module, a hydraulic sensor, a first voltage comparator, a second voltage comparator, a first phase inverter, a second phase inverter, a forward rotation switch module and a reverse rotation switch module. When the hydraulic pressure in the pipeline where the liquid outlet of the electric butterfly valve is located is smaller than the preset lower limit pressure, the butterfly valve driving motor rotates forwards to drive the electric butterfly valve to rotate towards the opening side, the liquid supply amount in the liquid outlet pipeline is increased, and the hydraulic pressure in the liquid outlet pipeline is increased; when the hydraulic pressure is between the preset lower limit pressure and the preset upper limit pressure, the butterfly valve driving motor stops rotating without being connected with a power supply; when the hydraulic pressure in the pipeline where the liquid outlet of the electric butterfly valve is located is larger than the preset upper limit pressure, the electric butterfly valve is driven to rotate towards the closing side, the liquid supply amount in the liquid outlet pipeline is reduced, and the hydraulic pressure in the liquid outlet pipeline is reduced; according to the utility model, the functions of self-control regulation and pressure maintaining of the hydraulic pressure in the liquid outlet pipeline are realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve control technical field, concretely relates to a self -control pressure -maintaining control circuit of electric butterfly valve. BACKGROUND

[0002] Butterfly valve in practical application, often is used for adjusting the pressure difference of gas pressure or hydraulic pressure of butterfly valve two ends, adjusts the opening of butterfly valve drive motor to adjust the pressure difference of gas pressure or hydraulic pressure of butterfly valve two ends through adjusting the opening of butterfly valve.

[0003] The prior art needs to adjust the pressure difference of electric butterfly valve two ends, mainly through the external motor control system control electric butterfly valve butterfly valve drive motor to control the rotation of electric butterfly valve valve stem to adjust the opening of electric butterfly valve.

[0004] In order to realize the pressure control in pipeline needs external motor control system, utilizes feedback control mode to control the opening of electric butterfly valve to realize the pressure of the pipeline where electric butterfly valve is located, it is obvious that the pressure regulating mode of electric butterfly valve in prior art needs to rely on external control system, improves the cost of pipeline pressure regulating and pressure maintaining. UTILITY MODEL CONTENTS

[0005] In order to solve the technical problems, such as the pressure regulating mode of electric butterfly valve in prior art needs to rely on external control system, improves the cost of pipeline pressure regulating and pressure maintaining, the utility model provides a self -control pressure -maintaining control circuit of electric butterfly valve.

[0006] The utility model solves the technical scheme that the above technical problem is as follows:

[0007] A self -control pressure -maintaining control circuit of electric butterfly valve, including battery, power module, hydraulic sensor, first voltage comparator, second voltage comparator, first inverter, second inverter, positive rotation switch module and reverse rotation switch module;

[0008] The input of power module is electrically connected with battery, the output of power module is electrically connected with the power input of hydraulic sensor, the positive pole of power input of first voltage comparator and the positive pole of power input of second voltage comparator respectively, the negative pole of power input of first voltage comparator and the negative pole of power input of second voltage comparator are all grounded;

[0009] The output of hydraulic sensor is electrically connected with the same phase input of first voltage comparator and the opposite phase input of second voltage comparator respectively, the opposite phase input of first voltage comparator is connected with first reference voltage, the same phase input of second voltage comparator is connected with second reference voltage, wherein, first reference voltage is less than second reference voltage;

[0010] The output end of the first voltage comparator is electrically connected with the input end of the first inverter, the output end of the second voltage comparator is electrically connected with the input end of the second inverter, the output end of the first inverter is electrically connected with the control end of the forward switch module, and the output end of the second inverter is electrically connected with the control end of the reverse switch module.

[0011] The positive pole of the power input end of the forward switch module is electrically connected with the output end of the power module, and the negative pole of the power input end of the forward switch module is grounded.

[0012] The positive pole of the power input end of the reverse switch module is electrically connected with the output end of the power module, and the negative pole of the power input end of the reverse switch module is grounded.

[0013] The electric butterfly valve is controlled automatically to adjust when the hydraulic pressure in the liquid outlet pipeline exceeds the preset hydraulic pressure range.

[0014] On the basis of the above technical scheme, the utility model still can make improvement as follows.

[0015] Further, it further comprises a first signal amplifier and a second signal amplifier, the output end of the first inverter is electrically connected with the input end of the first signal amplifier, the output end of the second inverter is electrically connected with the input end of the second signal amplifier, the output end of the first signal amplifier is electrically connected with the control end of the forward rotation switch module, and the output end of the second signal amplifier is electrically connected with the control end of the reverse rotation switch module.

[0016] The beneficial effect of the above further scheme is that the driving capacity of the single-chip microcomputer can be improved by setting the first signal amplifier and the second signal amplifier.

[0017] Further, the first signal amplifier comprises a first operational amplifier, a first resistor and a second resistor, the non-inverting input terminal of the first operational amplifier is electrically connected with the output terminal of the first inverter, one end of the first resistor is electrically connected with the output terminal of the first operational amplifier, the other end of the first resistor is electrically connected with the inverting input terminal of the first operational amplifier and one end of the second resistor respectively, the other end of the second resistor is grounded, and the output terminal of the first operational amplifier is electrically connected with the control terminal of the forward rotation switch module.

[0018] Further, the second signal amplifier comprises a second operational amplifier, a third resistor and a fourth resistor, the non-inverting input terminal of the second operational amplifier is electrically connected with the output terminal of the second inverter, one end of the third resistor is electrically connected with the output terminal of the second operational amplifier, the other end of the third resistor is electrically connected with the inverting input terminal of the second operational amplifier and one end of the fourth resistor respectively, the other end of the fourth resistor is grounded, and the output terminal of the second operational amplifier is electrically connected with the control terminal of the reverse rotation switch module.

[0019] Further, the forward rotation switch module comprises a first triode, a fifth resistor, a sixth resistor and a first relay, one end of the fifth resistor is electrically connected with the output terminal of the first operational amplifier, the other end of the fifth resistor is electrically connected with the base of the first triode and one end of the sixth resistor respectively, the other end of the sixth resistor and the emitter of the first triode are grounded, one end of the coil of the first relay is electrically connected with the output terminal of the power module, the other end of the coil of the first relay is electrically connected with the collector of the first triode, and the first relay comprises two groups of contacts of the forward rotation switch module.

[0020] Further, the forward rotation switch module further comprises a forward rotation limit switch, one end of the forward rotation limit switch is electrically connected with the output terminal of the power module, and the other end of the forward rotation limit switch is electrically connected with one end of the coil of the first relay.

[0021] Further, the reverse rotation switch module comprises a second triode, a seventh resistor, an eighth resistor and a second relay, one end of the seventh resistor is electrically connected with the output terminal of the second operational amplifier, the other end of the seventh resistor is electrically connected with the base of the second triode and one end of the eighth resistor respectively, the other end of the eighth resistor and the emitter of the second triode are grounded, one end of the coil of the second relay is electrically connected with the output terminal of the power module, the other end of the coil of the second relay is electrically connected with the collector of the second triode, and the second relay comprises two groups of contacts of the reverse rotation switch module.

[0022] Further, the reverse switch module further comprises a reverse limit switch, one end of the reverse limit switch is electrically connected with the output end of the power module, and the other end of the reverse limit switch is electrically connected with one end of the coil of the second relay.

[0023] Further, the reverse switch module further comprises a reverse limit switch, one end of the reverse limit switch is electrically connected with the output end of the power module, and the other end of the reverse limit switch is electrically connected with one end of the coil of the second relay.

[0024] The beneficial effect of the above further scheme is that the first near driving switch and the second near driving switch can be used to open and close the electric butterfly valve, so that the electric butterfly valve can be controlled on site.

[0025] Further, the reverse switch module further comprises a reverse limit switch, one end of the reverse limit switch is electrically connected with the output end of the power module, and the other end of the reverse limit switch is electrically connected with one end of the coil of the second relay.

[0026] The beneficial effect of the above further scheme is that the first near driving switch and the second near driving switch can be used to open and close the electric butterfly valve, so that the electric butterfly valve can be controlled on site. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 The circuit principle diagram of the utility model;

[0028] Figure 2 The circuit principle diagram of the first signal amplifier;

[0029] Figure 3 The circuit principle diagram of the second signal amplifier;

[0030] Figure 4 The circuit principle diagram of the positive rotation switch module and the reverse switch module;

[0031] Figure 5 The circuit principle diagram of the first voltage comparator;

[0032] Figure 6 Circuit schematic of the second voltage comparator. DETAILED DESCRIPTION

[0033] The principles and features of the present application are described below in conjunction with the accompanying drawings, which are presented only for the purpose of explanation and are not intended to limit the scope of the present application.

[0034] As shown in Figure 1 The embodiment provides a self-control pressure maintaining control circuit of an electric butterfly valve, which comprises a storage battery U1, a power module U2, a hydraulic sensor U3, a first voltage comparator U4, a second voltage comparator U5, a first inverter Y1, a second inverter Y2, a forward rotation switch module U6 and a reverse rotation switch module U7.

[0035] The input end of the power module U2 is electrically connected with the storage battery U1, the output end of the power module U2 is electrically connected with the power input end of the hydraulic sensor U3, the positive pole of the power input end of the first voltage comparator U4 and the positive pole of the power input end of the second voltage comparator U5, respectively, and the negative pole of the power input end of the first voltage comparator U4 and the negative pole of the power input end of the second voltage comparator U5 are grounded.

[0036] The output end of the hydraulic sensor U3 is electrically connected with the non-inverting input end of the first voltage comparator U4 and the inverting input end of the second voltage comparator U5, respectively, the inverting input end of the first voltage comparator U4 is connected with a first reference voltage VREF1, and the non-inverting input end of the second voltage comparator U5 is connected with a second reference voltage VREF2, wherein the first reference voltage VREF1 is less than the second reference voltage VREF2; the first reference voltage VREF1 and the second reference voltage VREF2 can be provided by an externally connected multi-output DC transformer.

[0037] The output end of the first voltage comparator U4 is electrically connected with the input end of the first inverter Y1, the output end of the second voltage comparator U5 is electrically connected with the input end of the second inverter Y2, the output end of the first inverter Y1 is electrically connected with the control end of the forward rotation switch module U6, and the output end of the second inverter Y2 is electrically connected with the control end of the reverse rotation switch module U7.

[0038] The positive pole of the power input end of the forward rotation switch module U6 is electrically connected with the output end of the power module U2, and the negative pole of the power input end of the forward rotation switch module U6 is grounded, the forward rotation switch module includes two groups of contacts, each group of contacts includes two normally open contacts; one normally open contact of one group of contacts of the forward rotation switch module U6 is connected to the motor working power supply, and the other normally open contact of one group of contacts of the forward rotation switch module U6 is electrically connected with one power input end of the butterfly valve driving motor M; one normally open contact of the other group of contacts of the forward rotation switch module U6 is grounded, and the other normally open contact of the other group of contacts of the forward rotation switch module U6 is electrically connected with the other power input end of the butterfly valve driving motor M;

[0039] The positive pole of the power input end of the reverse rotation switch module U7 is electrically connected with the output end of the power module U2, and the negative pole of the power input end of the reverse rotation switch module U7 is grounded, the reverse rotation switch module includes two groups of contacts, each group of contacts includes two normally open contacts; one normally open contact of one group of contacts of the reverse rotation switch module U7 is electrically connected with one power input end of the butterfly valve driving motor M, and the other normally open contact of one group of contacts of the reverse rotation switch module U7 is grounded; one normally open contact of the other group of contacts of the reverse rotation switch module U7 is electrically connected with the other power input end of the butterfly valve driving motor M, and the other normally open contact of the other group of contacts of the reverse rotation switch module U7 is connected to the motor working power supply.

[0040] The battery adopts a rechargeable battery, the voltage of the battery is 12V, and the output end of the power module U2 includes at least two, one of which outputs a voltage of 5V, and the other outputs a voltage of 12V; the motor working power supply can be selected from 24V DC power supply, 36V DC power supply, 48V DC power supply or 110V DC power supply, etc. The output end of the power module U2 with an output of 5V respectively supplies power for the hydraulic sensor U3, the first voltage comparator U4 and the second voltage comparator U5, and the output end of the power module U2 with an output of 12V respectively supplies power for the forward rotation switch module U6 and the reverse rotation switch module U7. The power module U2 can be directly selected as a 12V to 5V DC voltage reduction module, since the output voltage of the battery is 12V, therefore, the 12V output end of the power module U2 can be directly connected with the input end of the power module U2 through a wire or a conductor.

[0041] The hydraulic sensor U3 is installed on the liquid outlet pipeline where the electric butterfly valve liquid outlet is located, the hydraulic sensor U3 can output voltage according to the liquid pressure in the liquid outlet pipeline in a certain proportion, when the liquid pressure in the pipeline where the electric butterfly valve liquid outlet is located is less than the preset lower limit pressure, the voltage output by the hydraulic sensor U3 is less than the first reference voltage VREF1, the first voltage comparator U4 outputs a low level signal, the second voltage comparator U5 outputs a high level signal, the first voltage comparator U4 outputs a high level signal after the first inverter Y1, the positive rotation switch module U6 is connected, the butterfly valve driving motor M rotates in the positive direction, the electric butterfly valve is driven to rotate to the opening side, the liquid supply in the liquid outlet pipeline increases, and the liquid pressure in the liquid outlet pipeline rises; when the liquid pressure in the pipeline where the electric butterfly valve liquid outlet is located is between the preset lower limit pressure and the preset upper limit pressure, the voltage output by the hydraulic sensor U3 is higher than the first reference voltage VREF1 and less than the second reference voltage VREF2, the first voltage comparator U4 and the second voltage comparator U5 both output high level signals, and the positive rotation switch module U6 and the reverse rotation switch module U7 are both cut off, so that the butterfly valve driving motor M stops rotating without power supply; when the liquid pressure in the pipeline where the electric butterfly valve liquid outlet is located is greater than the preset upper limit pressure, the voltage output by the hydraulic sensor U3 is greater than the second reference voltage VREF2, the first voltage comparator U4 outputs a high level signal, the second voltage comparator U5 outputs a low level signal, the first voltage comparator U4 outputs a low level signal after the first inverter Y1, the second voltage comparator U5 outputs a high level signal after the second inverter Y2, the reverse rotation switch module U7 is connected, the butterfly valve driving motor M is reversed, the electric butterfly valve is driven to rotate to the closing side, the liquid supply in the liquid outlet pipeline decreases, and the liquid pressure in the liquid outlet pipeline decreases; therefore, the electric butterfly valve can be automatically controlled and adjusted when the liquid pressure in the liquid outlet pipeline exceeds the preset liquid pressure range, so that the functions of automatic control and pressure maintaining of the liquid pressure in the liquid outlet pipeline are realized.

[0042] In some embodiments, the first signal amplifier U8 and the second signal amplifier U9 are further included, the output end of the first inverter Y1 is electrically connected with the input end of the first signal amplifier U8, the output end of the second inverter Y2 is electrically connected with the input end of the second signal amplifier U9, the output end of the first signal amplifier U8 is electrically connected with the control end of the positive rotation switch module U6, and the output end of the second signal amplifier U9 is electrically connected with the control end of the reverse rotation switch module U7. The first signal amplifier and the second signal amplifier can improve the driving capacity of the single-chip microcomputer.

[0043] In some embodiments, an emergency stop switch S3 is further included, one end of the emergency stop switch S3 is electrically connected with the output end of the power supply module U2, and the other end of the emergency stop switch S3 is electrically connected with the positive pole of the power supply input end of the forward rotation switch module U6 and the positive pole of the power supply input end of the reverse rotation switch module U7, respectively. By setting the emergency stop switch, the emergency stop switch can be pressed to cut off the power supply of the forward rotation switch module and the reverse rotation switch module when emergency stop is needed, so that the emergency stop of the butterfly valve driving motor is realized.

[0044] As shown in Figure 2 The first signal amplifier U8 includes a first operational amplifier U10, a first resistor R1 and a second resistor R2, the non-inverting input end of the first operational amplifier U10 is electrically connected with the output end of the first inverter Y1, one end of the first resistor R1 is electrically connected with the output end of the first operational amplifier U10, the other end of the first resistor R1 is electrically connected with the inverting input end of the first operational amplifier U10 and one end of the second resistor R2, respectively, the other end of the second resistor R2 is grounded, and the output end of the first operational amplifier U10 is electrically connected with the control end of the forward rotation switch module U6. The first signal amplifier U10 is a non-inverting amplifier, the voltage Vout of the output end of the first operational amplifier U10 is equal to 1+R1 / R2 Vin, R1 represents the voltage value of the first resistor R1, R2 represents the voltage value of the second resistor R2, and Vin represents the voltage value of the non-inverting input end of the first operational amplifier U10.

[0045] As shown in Figure 3 The second signal amplifier U9 includes a second operational amplifier U11, a third resistor R3 and a fourth resistor R4, the non-inverting input end of the second operational amplifier U11 is electrically connected with the output end of the second inverter Y2, one end of the third resistor R3 is electrically connected with the output end of the second operational amplifier U11, the other end of the third resistor R3 is electrically connected with the inverting input end of the second operational amplifier U11 and one end of the fourth resistor R4, respectively, the other end of the fourth resistor R4 is grounded, and the output end of the second operational amplifier U11 is electrically connected with the control end of the reverse rotation switch module U7. The second signal amplifier U11 is the same non-inverting amplifier as the first signal amplifier U11, the resistance value of the third resistor R3 is equal to the voltage value of the first resistor R1, and the resistance value of the fourth resistor R4 is equal to the resistance value of the second resistor R2, so that the amplification factor of the second signal amplifier U9 is the same as that of the first signal amplifier U8.

[0046] As shown in Figure 4As shown, the forward rotation switch module U6 includes a first transistor Q1, a fifth resistor R5, a sixth resistor R6, and a first relay K1. One end of the fifth resistor R5 is electrically connected to the output terminal of the first operational amplifier U10, and the other end of the fifth resistor R5 is electrically connected to the base of the first transistor Q1 and one end of the sixth resistor R6. The other end of the sixth resistor R6 and the emitter of the first transistor Q1 are both grounded. One end of the coil of the first relay K1 is electrically connected to the output terminal of the power supply module U2, and the other end of the coil of the first relay K1 is electrically connected to the collector of the first transistor Q1. The first relay K1 includes two sets of contacts of the forward rotation switch module.

[0047] After the high-level signal output from the first inverter Y1 is amplified by the first signal amplifier U8, the base of the first transistor Q1 is at a high level, the first transistor Q1 is turned on, the coil of the first relay K1 is energized, the normally open contact of the first relay K1 is attracted, the butterfly valve drive motor is energized, and the electrically controlled butterfly valve is opened.

[0048] In some embodiments, the forward rotation switch module U6 further includes a forward rotation limit switch S4. One end of the forward rotation limit switch S4 is electrically connected to the output terminal of the power supply module U2, and the other end of the forward rotation limit switch S4 is electrically connected to one end of the coil of the first relay K1. By setting the forward rotation limit switch S4, it is installed at the limit position on the opening side of the electrically controlled butterfly valve. When the valve shaft of the electrically controlled butterfly valve rotates towards the opening side, it triggers the forward rotation limit switch S4 when it reaches the limit position. The forward rotation limit switch S4 is then disconnected, the coil of the first relay K1 is de-energized, the butterfly valve drive motor is de-energized, and forward rotation stops.

[0049] In some embodiments, the forward rotation switch module U6 further includes a first diode D1. The cathode of the first diode D1 is electrically connected to one end of the coil of the first relay K1, and the anode of the first diode D1 is electrically connected to the other end of the coil of the first relay K1. Connecting the first diode D1 across the coil of the first relay K1 primarily serves to absorb inrush current and protect other components in the circuit from damage. When the electromagnetic coil is de-energized, due to the principle of electromagnetic induction, a certain amount of energy is stored in the coil. If the power is directly cut off, a high back electromotive force (EMF) will be generated across the coil, potentially damaging the coil or other electronic components. By connecting a diode in parallel across the coil, the unidirectional conductivity of the diode can be utilized to release the energy in the coil, thereby preventing the generation of back EMF and protecting other components in the circuit.

[0050] like Figure 4As shown, the reverse switch module U7 includes a second triode Q2, a seventh resistor R7, an eighth resistor R8 and a second relay K2; one end of the seventh resistor R7 is electrically connected with the output end of the second operational amplifier U11, the other end of the seventh resistor R7 is electrically connected with the base of the second triode Q2 and one end of the eighth resistor R8 respectively, the other end of the eighth resistor R8 and the emitter of the second triode Q2 are grounded, one end of the coil of the second relay K2 is electrically connected with the output end of the power module U2, the other end of the coil of the second relay K2 is electrically connected with the collector of the second triode Q2, the second relay K2 includes two groups of contacts of the reverse switch module. When the high level signal output by the second inverter Y2 is amplified by the second signal amplifier U4, the base of the second triode Q2 is at high level, the second triode Q2 is turned on, the coil of the second relay K2 is electrified, the normally open contact of the second relay K2 is attracted, the butterfly valve driving motor is electrified, and the electric control butterfly valve is driven to close.

[0051] In some embodiments, the reverse switch module U7 further includes a reverse limit switch S5, one end of the reverse limit switch S5 is electrically connected with the output end of the power module U2, and the other end of the reverse limit switch S5 is electrically connected with one end of the coil of the second relay K2. By setting the reverse limit switch S5, the reverse limit switch S5 is installed at the limit position of the closing side of the electric control butterfly valve, when the valve shaft of the electric control butterfly valve rotates to the closing side, the reverse limit switch S5 is triggered when reaching the limit position, the reverse limit switch S5 is disconnected, the coil of the second relay K2 loses power, the butterfly valve driving motor loses power, and the reverse is stopped. Two limit blocks can be arranged on the valve shaft of the electric control butterfly valve, the two limit blocks are arranged on both sides of the valve shaft of the electric control butterfly valve, the forward limit switch S4 and the reverse limit switch S5 are arranged on both sides of the valve shaft of the electric control butterfly valve, when one of the two limit blocks triggers the forward limit switch S4, the butterfly valve driving motor loses power and the forward rotation is stopped; when the other of the two limit blocks triggers the reverse limit switch S5, the butterfly valve driving motor loses power and the reverse rotation is stopped.

[0052] In some embodiments, the reverse switch module U7 further comprises a second diode D2, a negative electrode of the second diode D2 is electrically connected with one end of the coil of the second relay K2, and a positive electrode of the second diode D2 is electrically connected with the other end of the coil of the second relay K2. By connecting the second diode D2 across the coil of the second relay K2, the main function is to absorb the inrush current and protect other elements in the circuit from damage. When the electromagnetic coil is powered off, due to the principle of electromagnetic induction, a certain amount of energy will be stored in the coil. If the power is directly turned off, a very high counter electromotive force will be generated across the coil, which may damage the coil or other electronic components. By connecting a diode in parallel across the coil, the diode's unidirectional conductivity can be used to discharge the energy in the coil through the diode, thereby avoiding the generation of counter electromotive force and protecting other elements in the circuit.

[0053] In some embodiments, a first local drive switch S1, a second local drive switch S2, a first OR gate Y3 and a second OR gate Y4 are further included, one end of the first local drive switch S1 and one end of the second local drive switch S2 are electrically connected with the output end of the power module U2, one input end of the first OR gate Y3 is electrically connected with the other end of the first local drive switch S1, and the other input end of the first OR gate Y3 is electrically connected with the output end of the first signal amplifier U8; one input end of the second OR gate Y4 is electrically connected with the other end of the second local drive switch S2, and the other input end of the second OR gate Y4 is electrically connected with the output end of the second signal amplifier U9; the output end of the first OR gate Y3 is electrically connected with the control end of the forward switch module U6, and the output end of the second OR gate Y4 is electrically connected with the control end of the reverse switch module U7; the first local drive switch S1 and the second local drive switch S2 are interlocked.

[0054] By setting the first local drive switch, the second local drive switch, the first OR gate Y3 and the second OR gate Y4, when the first local drive switch or the second local drive switch is pressed, the first OR gate Y3 and the second OR gate Y4 output a high-level signal, which can open and close the electric butterfly valve on the electric butterfly valve, so as to facilitate the control of the electric butterfly valve on site.

[0055] As Figure 5As shown, the first voltage comparator U4 includes a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11 and a third operational amplifier U12, one end of the ninth resistor R9 is connected to the output end of the hydraulic sensor U3, the other end of the ninth resistor R9 is connected to the inverting input end of the third operational amplifier U12, one end of the tenth resistor R10 is connected to the first reference voltage VREF1, the other end of the tenth resistor R10 is connected to the non-inverting input end of the third operational amplifier U12, one end of the eleventh resistor R11 and the positive pole of the power input end of the third operational amplifier U12 are both connected to the output end of the power module U2, the other end of the eleventh resistor R11 is connected to the output end of the third operational amplifier U12, and the output end of the third operational amplifier U12 is connected to the input end of the first inverter Y1.

[0056] As shown in the figure, Figure 6 As shown, the second voltage comparator U5 includes a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14 and a fourth operational amplifier U13, one end of the twelfth resistor R12 is connected to the output end of the hydraulic sensor U3, the other end of the twelfth resistor R12 is connected to the non-inverting input end of the fourth operational amplifier U13, one end of the thirteenth resistor R13 is connected to the second reference voltage VREF2, the other end of the thirteenth resistor R13 is connected to the inverting input end of the fourth operational amplifier U13, one end of the fourteenth resistor R14 and the positive pole of the power input end of the fourth operational amplifier U13 are both connected to the output end of the power module U2, the other end of the fourteenth resistor R14 is connected to the output end of the fourth operational amplifier U13, and the output end of the fourth operational amplifier U13 is connected to the input end of the second inverter Y2.

[0057] The above only describes the preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the concept and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A self-control pressure maintaining control circuit of an electric butterfly valve, characterized by comprising: The battery (U1), the power module (U2), the hydraulic sensor (U3), the first voltage comparator (U4), the second voltage comparator (U5), the first inverter (Y1), the second inverter (Y2), the forward rotation switch module (U6) and the reverse rotation switch module (U7) are included. The input end of the power module (U2) is electrically connected with the battery (U1), the output end of the power module (U2) is electrically connected with the power input end of the hydraulic sensor (U3), the positive electrode of the power input end of the first voltage comparator (U4) and the positive electrode of the power input end of the second voltage comparator (U5) respectively, and the negative electrode of the power input end of the first voltage comparator (U4) and the negative electrode of the power input end of the second voltage comparator (U5) are grounded. The output end of the hydraulic sensor (U3) is electrically connected with the non-inverting input end of the first voltage comparator (U4) and the inverting input end of the second voltage comparator (U5) respectively, the inverting input end of the first voltage comparator (U4) is connected with the first reference voltage (VREF1), and the non-inverting input end of the second voltage comparator (U5) is connected with the second reference voltage (VREF2), wherein the first reference voltage (VREF1) is less than the second reference voltage (VREF2). The output end of the first voltage comparator (U4) is electrically connected with the input end of the first inverter (Y1), the output end of the second voltage comparator (U5) is electrically connected with the input end of the second inverter (Y2), the output end of the first inverter (Y1) is electrically connected with the control end of the forward rotation switch module (U6), and the output end of the second inverter (Y2) is electrically connected with the control end of the reverse rotation switch module (U7). The positive electrode of the power input end of the forward rotation switch module (U6) is electrically connected with the output end of the power module (U2), the negative electrode of the power input end of the forward rotation switch module (U6) is grounded, the forward rotation switch module includes two groups of contacts, each group of contacts includes two normally open contacts, one normally open contact of one group of contacts of the forward rotation switch module (U6) is connected with the motor working power supply, the other normally open contact of one group of contacts of the forward rotation switch module (U6) is electrically connected with one power input end of the butterfly valve driving motor (M), one normally open contact of the other group of contacts of the forward rotation switch module (U6) is grounded, and the other normally open contact of the other group of contacts of the forward rotation switch module (U6) is electrically connected with the other power input end of the butterfly valve driving motor (M). The positive electrode of the power input end of the reverse switch module (U7) is electrically connected with the output end of the power module (U2), and the negative electrode of the power input end of the reverse switch module (U7) is grounded. The reverse switch module includes two groups of contacts, and each group of contacts includes two normally open contacts. One normally open contact of one group of contacts of the reverse switch module (U7) is electrically connected with one power input end of the butterfly valve driving motor (M), and the other normally open contact of the one group of contacts of the reverse switch module (U7) is grounded. One normally open contact of the other group of contacts of the reverse switch module (U7) is electrically connected with the other power input end of the butterfly valve driving motor (M), and the other normally open contact of the other group of contacts of the reverse switch module (U7) is connected to the motor working power supply.

2. The self-control pressure maintaining control circuit of the electric butterfly valve according to claim 1, characterized in that: Further comprising a first signal amplifier (U8) and a second signal amplifier (U9). The output end of the first inverter (Y1) is electrically connected with the input end of the first signal amplifier (U8), and the output end of the second inverter (Y2) is electrically connected with the input end of the second signal amplifier (U9). The output end of the first signal amplifier (U8) is electrically connected with the control end of the forward rotation switch module (U6), and the output end of the second signal amplifier (U9) is electrically connected with the control end of the reverse switch module (U7).

3. The self-control pressure maintaining control circuit of the electric butterfly valve according to claim 2, characterized in that: The first signal amplifier (U8) includes a first operational amplifier (U10), a first resistor (R1), and a second resistor (R2). The non-inverting input end of the first operational amplifier (U10) is electrically connected with the output end of the first inverter (Y1). One end of the first resistor (R1) is electrically connected with the output end of the first operational amplifier (U10). The other end of the first resistor (R1) is respectively electrically connected with the inverting input end of the first operational amplifier (U10) and one end of the second resistor (R2). The other end of the second resistor (R2) is grounded. The output end of the first operational amplifier (U10) is electrically connected with the control end of the forward rotation switch module (U6).

4. The self-control pressure maintaining control circuit of the electric butterfly valve according to claim 3, characterized in that: The second signal amplifier (U9) includes a second operational amplifier (U11), a third resistor (R3), and a fourth resistor (R4). The non-inverting input end of the second operational amplifier (U11) is electrically connected with the output end of the second inverter (Y2). One end of the third resistor (R3) is electrically connected with the output end of the second operational amplifier (U11). The other end of the third resistor (R3) is respectively electrically connected with the inverting input end of the second operational amplifier (U11) and one end of the fourth resistor (R4). The other end of the fourth resistor (R4) is grounded. The output end of the second operational amplifier (U11) is electrically connected with the control end of the reverse switch module (U7).

5. The self-control pressure maintaining control circuit of the electric butterfly valve according to claim 4, characterized in that: The positive rotation switch module (U6) includes a first triode (Q1), a fifth resistor (R5), a sixth resistor (R6) and a first relay (K1); one end of the fifth resistor (R5) is electrically connected with the output end of the first operational amplifier (U10), the other end of the fifth resistor (R5) is electrically connected with the base of the first triode (Q1) and one end of the sixth resistor (R6) respectively, the other end of the sixth resistor (R6) and the emitter of the first triode (Q1) are grounded, one end of the coil of the first relay (K1) is electrically connected with the output end of the power module (U2), the other end of the coil of the first relay (K1) is electrically connected with the collector of the first triode (Q1), and the first relay (K1) includes two groups of contacts of the positive rotation switch module.

6. The self-control pressure maintaining control circuit of the electric butterfly valve according to claim 5, characterized in that: The positive rotation switch module (U6) further includes a positive rotation limit switch (S4), one end of the positive rotation limit switch (S4) is electrically connected with the output end of the power module (U2), and the other end of the positive rotation limit switch (S4) is electrically connected with one end of the coil of the first relay (K1).

7. The self-control pressure maintaining control circuit of the electric butterfly valve according to claim 4, characterized in that: The reverse rotation switch module (U7) includes a second triode (Q2), a seventh resistor (R7), an eighth resistor (R8) and a second relay (K2); one end of the seventh resistor (R7) is electrically connected with the output end of the second operational amplifier (U11), the other end of the seventh resistor (R7) is electrically connected with the base of the second triode (Q2) and one end of the eighth resistor (R8) respectively, the other end of the eighth resistor (R8) and the emitter of the second triode (Q2) are grounded, one end of the coil of the second relay (K2) is electrically connected with the output end of the power module (U2), the other end of the coil of the second relay (K2) is electrically connected with the collector of the second triode (Q2), and the second relay (K2) includes two groups of contacts of the reverse rotation switch module.

8. The self-control pressure maintaining control circuit of the electric butterfly valve according to claim 7, characterized in that: The reverse rotation switch module (U7) further includes a reverse rotation limit switch (S5), one end of the reverse rotation limit switch (S5) is electrically connected with the output end of the power module (U2), and the other end of the reverse rotation limit switch (S5) is electrically connected with one end of the coil of the second relay (K2).

9. The self-control pressure maintaining control circuit of the electric butterfly valve according to claim 2, characterized in that: Also include first near drive switch (S1), second near drive switch (S2), first or gate (Y3) and second or gate (Y4), one end of the first near drive switch (S1) and one end of the second near drive switch (S2) are electrically connected with the output end of the power module (U2), one input end of the first or gate (Y3) is electrically connected with the other end of the first near drive switch (S1), the other input end of the first or gate (Y3) is electrically connected with the output end of the first signal amplifier (U8); One input end of the second or gate (Y4) is electrically connected with the other end of the second near drive switch (S2), the other input end of the second or gate (Y4) is electrically connected with the output end of the second signal amplifier (U9); The output end of the first or gate (Y3) is electrically connected with the control end of the positive rotation switch module (U6), the output end of the second or gate (Y4) is electrically connected with the control end of the reverse rotation switch module (U7); The first near drive switch (S1) and the second near drive switch (S2) are interlocked.

10. The self-control pressure maintaining control circuit of the electric butterfly valve according to claim 1, characterized in that: Also include emergency stop switch (S3), one end of the emergency stop switch (S3) is electrically connected with the output end of the power module (U2), the other end of the emergency stop switch (S3) is respectively electrically connected with the positive electrode of the power input end of the positive rotation switch module (U6) and the positive electrode of the power input end of the reverse rotation switch module (U7).

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