Switching module capable of controlling opening and closing of two-wire valve

Abstract

The invention discloses a switch conversion module capable of controlling a two-wire valve. The switch conversion module comprises a control unit, a switch conversion unit and a key unit, wherein the switch conversion unit and the key unit are connected with the control unit; the switch conversion unit comprises a signal isolation circuit and a valve driving circuit, and the signal isolation circuit is connected between the control unit and the valve driving circuit; the valve driving circuit is connected with the two-wire valve; the key unit is used for sending a corresponding trigger signal to the control unit; and the control unit generates a corresponding control signal according to the trigger signal so as to control the valve driving circuit to drive the two-wire valve to be opened, closed or opened at a preset angle through the signal isolation circuit. The module greatly expands the additional function of the two-wire valve, the switching module capable of controlling the two-wire valve to be opened and closed is simply connected with the two-wire valve in a wiring mode, and installation time and labor are saved.

Description

Technical Field

[0001] The invention relates to the technical field of valves, and in particular to a switch conversion module capable of controlling a two-wire valve. Background Art

[0002] Electric ball valve is a kind of valve that uses electric motor as power source, rotates the ball through gear reduction mechanism and valve stem linkage, so as to realize the control of medium in pipeline. It has the advantages of fast opening and closing, reliable sealing and simple structure, and is widely used in automated production control systems in various industries.

[0003] The two-wire circuit of the electric ball valve refers to two wires as the input power supply. The two-wire valve only needs two wires for wiring. This wiring method not only reduces the complexity of wiring, but also saves installation time and manpower. The two-wire valve often only has basic on-off control functions, which is suitable for simple control needs and can realize manual / automatic switching and other functions. When in use, there are two working states, namely normally open and normally closed. The normally closed valve opens the valve when the power is turned on. When the button switch is operated, the DC positive and negative poles are automatically switched, and the original negative pole of the module output end becomes positive, and the positive pole becomes negative, so that the motor reverses and closes the valve. This circuit structure is simple and is usually only suitable for general industrial equipment control. Summary of the invention

[0004] In view of the defects in the prior art, the present invention provides a switch conversion module capable of controlling a two-wire valve to solve the technical problems raised in the background technology.

[0005] In order to achieve the above object, the present invention provides a controllable two-line valve switch conversion module, including a control unit and a switch conversion unit and a button unit connected to the control unit;

[0006] The switch conversion unit includes a signal isolation circuit and a valve drive circuit, wherein the signal isolation circuit is connected between the control unit and the valve drive circuit; the valve drive circuit is connected to the actuator of the two-line valve;

[0007] The button unit is used to send a corresponding trigger signal to the control unit;

[0008] The control unit generates a corresponding control signal according to the trigger signal, so as to control the valve driving circuit to drive the two-line valve to open, close or open a preset angle through the signal isolation circuit.

[0009] Further, the valve driving circuit includes two phototransistors, two transistors and four freewheeling diodes, the two phototransistors and the two transistors form an H-bridge circuit, and the two phototransistors are respectively arranged diagonally with the two transistors;

[0010] Between the phototransistors and the triodes that are arranged diagonally, the emitter of the phototransistor is connected to the base of the triode;

[0011] The four freewheeling diodes are respectively connected in parallel with the two phototransistors and the two transistors;

[0012] Furthermore, the signal isolation circuit includes two light emitting diodes arranged in one-to-one correspondence with the phototransistors, and the two light emitting diodes are respectively connected to the control unit for control.

[0013] Furthermore, a switch tube is connected to the control unit, a control end of the switch tube is connected to the control unit, and the phototransistor and the switch tube are connected in series between a power source and a ground.

[0014] Furthermore, the switch tube is a triode or a MOS tube.

[0015] Furthermore, it also includes a wireless communication module, which is connected to the control unit.

[0016] Furthermore, the wireless communication module is a Bluetooth module, a 4G module, a 5G module, a WiFi module, a lora module, a ZigBee module, a NB-IoT communication module, a GSM module or a GPRS module.

[0017] Further, it also includes a power conversion unit;

[0018] The power conversion unit is used to convert the external power supply into a standard voltage power supply;

[0019] The power conversion unit is connected to the control unit, the switch conversion unit, the button unit and the wireless communication module.

[0020] Furthermore, it also includes a display module, and the display module is connected to the control unit.

[0021] Furthermore, the display module is a liquid crystal display or a LED display.

[0022] The beneficial effects of the present invention are embodied in:

[0023] The controllable two-line valve switch conversion module provided by the present invention can accurately control the opening and closing states or the preset opening angles of the two-line valves after being connected to the two-line valves, and can also control the opening and closing speeds of the two-line valves, thus greatly expanding the additional functions of the two-line valves. Moreover, the controllable two-line valve switch conversion module is simple to connect to the two-line valve wiring, thus saving installation time and manpower.

[0024] At the same time, the controllable two-line valve switch conversion module has a wireless communication function, thereby enabling remote control of the two-line valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0026] The accompanying drawings herein are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification are used to explain the principles of the present application. For ordinary technicians in this field, other accompanying drawings can also be obtained based on these accompanying drawings without paying creative labor.

[0027] Figure 1 A system structure diagram of a controllable two-wire valve switch conversion module provided by an embodiment of the present invention;

[0028] Figure 2 A schematic diagram of a controllable two-wire valve switch conversion module provided by an embodiment of the present invention;

[0029] Figure 3 A circuit diagram of a switch conversion unit provided in an embodiment of the present invention;

[0030] Figure 4 A circuit diagram of a signal isolation circuit provided by an embodiment of the present invention;

[0031] Figure 5 A circuit diagram of a key unit provided in an embodiment of the present invention.

[0032] The realization of the purpose, functional features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. The above-mentioned drawings have shown clear embodiments of this application, which will be described in more detail later. These drawings and textual descriptions are not intended to limit the scope of the concept of this application in any way, but to illustrate the concept of this application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0033] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0034] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the invention belongs.

[0035] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0036] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0037] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0039] In this embodiment, the actuator of the two-line valve drives the valve through a servo motor or a stepper motor to control the opening and closing of the valve, and controls the opening and closing degree of the valve.

[0040] like Figure 1 and Figure 2As shown, an embodiment of the present invention provides a controllable two-line valve switch conversion module, including a shell 1, a control unit, and a switch conversion unit and a button unit connected to the control unit. The control unit and the switch conversion unit are integrated and packaged in the shell 1, and the button unit 3 is arranged on the shell 1.

[0041] The switch conversion unit includes a signal isolation circuit and a valve drive circuit, wherein the signal isolation circuit is connected between the control unit and the valve drive circuit; the valve drive circuit is connected to the actuator of the two-line valve and is used to drive the motor in the actuator to rotate forward or reverse.

[0042] Specifically, Figure 3 As shown, the valve drive circuit includes two phototransistors, two transistors and four freewheeling diodes. The two phototransistors and the two transistors form an H-bridge circuit. The two phototransistors are arranged diagonally with the two transistors. Two wiring terminals 2 are connected to the middle of the H-bridge circuit. The two wiring terminals 2 are fixedly arranged on the housing 1, which is convenient for quick connection with the connecting wire of the two-wire valve.

[0043] Between the photosensitive transistors and the transistors that are arranged diagonally, the emitter of the photosensitive transistor is connected to the base of the transistor. The four freewheeling diodes are respectively connected in parallel with two of the photosensitive transistors and two of the transistors.

[0044] Two phototransistors and two triodes act as switches in the circuit, and four freewheeling diodes act as unidirectional freewheeling. Since reverse electromotive force will be generated when the motor in the actuator stops suddenly or changes direction suddenly, in order to ensure the normal operation of the valve drive circuit, two pairs of freewheeling diodes are used to shunt the current to the positive pole of the power supply or the ground terminal to prevent the reverse electromotive force from damaging the valve drive circuit.

[0045] In order to increase the safety of the controllable two-wire valve switch conversion module and reduce circuit interference, the control signal output by the control unit is isolated. Figure 4 As shown, the signal isolation circuit includes two light emitting diodes arranged one-to-one with the phototransistors, and the two light emitting diodes are respectively connected to the control unit. A switch tube is connected to the control unit, and the control end of the switch tube is connected to the control unit. The phototransistor and the switch tube are connected in series between the power supply and the ground. The switch tube can be a transistor or a MOS tube.

[0046] like Figure 4As shown, after the control unit controls the switch tube to turn on by outputting a PWM signal, the light-emitting diode D1 emits light, at which time the phototransistor Q1 opposite to the corresponding light-emitting diode is turned on, and the diagonal transistor Q3 is turned on, and the current will drive the motor M to rotate clockwise, and the valve opens; similarly, when the control unit controls the light-emitting diode D2 to emit light by outputting a PWM signal, the phototransistor Q2 is turned on, and the diagonal transistor Q4 is turned on, the current will drive the motor M to rotate counterclockwise, and the valve closes.

[0047] In this embodiment, the control unit generates different waveform signals of PWM1 and PWM2 to control the light-emitting diodes D1 and D2 to emit light, so as to control the speed, forward and reverse rotation, and start and stop of the motor. The control unit can be a single-chip microcomputer or a digital signal processor (DSP), and the PWM signal is generated by the timer of the single-chip microcomputer or the digital signal processor (DSP). By controlling the duty cycle of the PWM signal, the speed of the motor can also be controlled, thereby controlling the opening and closing speed of the valve.

[0048] The button unit is used to send a corresponding trigger signal to the control unit. The button unit is designed to facilitate the control of the motor working state. By judging the button level, the microcontroller performs corresponding function processing, such as forward, reverse, acceleration, deceleration, and stop functions. The button unit circuit is as follows Figure 3 shown.

[0049] In one embodiment, the manager sends a corresponding trigger signal to the control unit by pressing a corresponding button on the button unit 3. Figure 5 As shown, the button unit 3 may include a valve closing button, a valve opening button, a stop button, etc. The control unit generates a corresponding control signal according to the trigger signal to control the valve driving circuit to drive the two-line valve to open, close or open a preset angle through the signal isolation circuit.

[0050] In this embodiment, the controllable two-line valve switch conversion module also includes a wireless communication module, and the wireless communication module is connected to the control unit. The wireless communication module is a Bluetooth module, a 4G module, a 5G module, a WiFi module, a lora module, a ZigBee module, a NB-IoT communication module, a GSM module or a GPRS module.

[0051] Through the wireless communication module, managers can remotely send remote control signals to the switch conversion module. The control unit controls the direction and speed of the motor in the actuator according to the remote control signal, thereby controlling the opening and closing of the valve and realizing remote control.

[0052] In this embodiment, the working voltage of the valve actuator is 12V or 24V, while the working voltage of the control unit, the switch conversion unit, the button unit and the wireless communication module is 5V, and the valve actuator is powered by a 12V external power supply. Therefore, the controllable two-wire valve switch conversion module also has a power conversion unit, which is used to convert the 12V external power supply into a 5V standard voltage power supply, and the power conversion unit is connected to the control unit, the switch conversion unit, the button unit and the wireless communication module for power supply.

[0053] In this embodiment, the power conversion unit adopts the LM7805 three-state regulator.

[0054] In this embodiment, the switch conversion module that can control the two-line valve also includes a display module 4, which is connected to the control unit. The display module 4 is a liquid crystal display or an LED display, and the display module is embedded on the housing 1. The display module 4 displays the current control state of the two-line valve by the switch conversion module.

[0055] In summary, the controllable two-line valve switch conversion module provided by the present invention, after being connected to the two-line valve, can accurately control the opening and closing state of the two-line valve or the preset opening angle, and can also control the opening and closing speed of the two-line valve, greatly expanding the additional functions of the two-line valve. In addition, the controllable two-line valve switch conversion module is simple to connect to the two-line valve wiring, saving installation time and manpower.

[0056] At the same time, the controllable two-line valve switch conversion module has a wireless communication function, thereby enabling remote control of the two-line valve.

[0057] Finally, it should be noted that the various technical features of the technical solution of the present application can be combined arbitrarily. In order to make the description concise, not all possible combinations of the various technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of the present application.

[0058] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments may still be modified, or some or all of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and should all be included in the scope of the claims and specification of the present invention.

Claims

1. A controllable two-wire valve switch conversion module, characterized in that: It includes a control unit and a switch conversion unit and a button unit connected to the control unit; The switch conversion unit includes a signal isolation circuit and a valve drive circuit, wherein the signal isolation circuit is connected between the control unit and the valve drive circuit; the valve drive circuit is connected to the actuator of the two-line valve; The button unit is used to send a corresponding trigger signal to the control unit; The control unit generates a corresponding control signal according to the trigger signal, so as to control the valve driving circuit to drive the two-line valve to open, close or open a preset angle through the signal isolation circuit.

2. A controllable two-wire valve switch conversion module as claimed in claim 1, characterized in that: The valve drive circuit comprises two photosensitive transistors, two transistors and four freewheeling diodes, the two photosensitive transistors and the two transistors constitute an H-bridge circuit, and the two photosensitive transistors are respectively arranged diagonally with the two transistors; Between the phototransistors and the triodes that are arranged diagonally, the emitter of the phototransistor is connected to the base of the triode; The four freewheeling diodes are respectively connected in parallel with the two photosensitive transistors and the two transistors.

3. A controllable two-wire valve switch conversion module as claimed in claim 1, characterized in that: The signal isolation circuit includes two light emitting diodes arranged in one-to-one correspondence with the phototransistors, and the two light emitting diodes are respectively connected to the control unit for control.

4. A controllable two-wire valve switch conversion module as claimed in claim 3, characterized in that: The control unit is connected with a switch tube, a control end of the switch tube is connected to the control unit, and the phototransistor and the switch tube are connected in series between a power source and a ground.

5. A controllable two-wire valve switch conversion module as claimed in claim 4, characterized in that: The switch tube is a triode or a MOS tube.

6. A controllable two-wire valve switch conversion module as claimed in claim 1, characterized in that: It also includes a wireless communication module, which is connected to the control unit.

7. A controllable two-wire valve switch conversion module as claimed in claim 6, characterized in that: The wireless communication module is a Bluetooth module, a 4G module, a 5G module, a WiFi module, a lora module, a ZigBee module, a NB-IoT communication module, a GSM module or a GPRS module.

8. A controllable two-wire valve switch conversion module as claimed in claim 6, characterized in that: Also included is a power conversion unit; The power conversion unit is used to convert the external power supply into a standard voltage power supply; The power conversion unit is connected to the control unit, the switch conversion unit, the button unit and the wireless communication module.

9. A controllable two-wire valve switch conversion module as claimed in claim 1, characterized in that: It also includes a display module, which is connected to the control unit.

10. A controllable two-wire valve switch conversion module as claimed in claim 9, characterized in that: The display module is a liquid crystal display or an LED display.

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