A miniature electronic pressure controller

Abstract

The utility model discloses a micro -electronic pressure controller, including valve base, and the proportioning valve and pressure feedback module are equipped with side -by -side in valve base top, and pressure feedback module includes circuit board and the pressure sensor integrated on circuit board, and the proportioning valve is equipped with proportioning valve air inlet and proportioning valve air outlet, and the valve base is equipped with the valve base air inlet pipeline for intercommunication air source and the valve base air outlet pipeline for conveying steady voltage gas, and the inside of valve base is equipped with the valve base air inlet for communicating with proportioning valve air inlet and the valve base air outlet for communicating with proportioning valve air outlet, and the valve base still is equipped with pressure sensing channel for installing pressure sensor, and pressure sensing channel communicates with valve base air outlet pipeline, and the above -mentioned design solves the technical problem that the import electronic pressure controller procurement price is high, and there is no standard spare replacement when maintaining inside.

Description

Technical Field

[0001] This utility model relates to the field of electronic pressure control, specifically to a miniature electronic pressure controller. Background Technology

[0002] The miniature electronic pressure controller converts variable electronic control signals into variable pneumatic outputs. Its advantages include small internal size and high integration of structure and circuitry. It can precisely control the pressure of manual regulators, needle valves, and vents. Its proportional valve and internal closed-loop control are ideal for carrier gas flow control, miniature gas flow control, and vacuum pump control.

[0003] The existing technology has the following three problems: 1. Imported electronic pressure controllers are expensive to purchase, have long production cycles, and are not easy to replace parts; 2. They have short service life, and there are no standard replacement parts when repairing internal components, making them difficult to repair; 3. Pressure controllers with different pressure values ​​cannot be adjusted or replaced.

[0004] To address this issue, our company provides a miniature electronic pressure controller. Utility Model Content

[0005] The purpose of this invention is to overcome the defects in the prior art and provide a miniature electronic pressure controller.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: A miniature electronic pressure controller includes a valve base, a proportional valve and a pressure feedback module arranged side by side above the valve base, and the pressure feedback module includes a circuit board and a pressure sensor integrated on the circuit board. The proportional valve has a proportional valve inlet and a proportional valve outlet. The valve base is provided with a valve base inlet pipe for connecting to a gas source and a valve base outlet pipe for conveying regulated gas. The valve base is provided with a valve base inlet for connecting to the proportional valve inlet and a valve base outlet for connecting to the proportional valve outlet. The valve base is also provided with a pressure sensing channel for installing the pressure sensor, and the pressure sensing channel is connected to the air outlet pipe of the valve base.

[0007] Preferably, the proportional valve and the circuit board are assembled and installed onto the valve base by fastening screws.

[0008] Preferably, a sealing ring is provided between the proportional valve inlet and the valve base inlet, and a sealing ring is provided between the proportional valve outlet and the valve base outlet.

[0009] Preferably, it also includes a housing, the housing having a housing air inlet connected to the valve base air inlet pipe and a housing air outlet connected to the valve base air outlet pipe.

[0010] Preferably, the outer casing has a window corresponding to the circuit board connector on the circuit board.

[0011] Preferably, the circuit board integrates an instrumentation amplifier, an error amplifier, a pressure-to-current conversion circuit, and a proportional valve control circuit. One end of the instrumentation amplifier is connected to the pressure sensor, and the other end of the instrumentation amplifier is connected to the error amplifier. The error amplifier is connected to the proportional valve control circuit through the pressure-to-current conversion circuit, and the proportional valve control circuit is connected to the proportional valve.

[0012] Preferably, the instrumentation amplifier includes a fifth amplifier, wherein the inverting input terminal of the fifth amplifier is connected to the first and sixth pins of the pressure sensor via a sixteenth sliding resistor, the non-inverting input terminal of the fifth amplifier is connected to the fourth pin of the pressure sensor, and the output terminal of the fifth amplifier is connected to the error amplifier.

[0013] Preferably, the error amplifier includes a second amplifier and a third amplifier, wherein the inverting input terminal of the second amplifier is connected to the output terminal of the fifth amplifier through a seventeenth resistor, the non-inverting input terminal of the second amplifier is connected to V-IN, a ninth resistor and a third capacitor connected in parallel are connected between the inverting input terminal and the output terminal of the second amplifier, and the output terminal of the second amplifier is connected to the voltage-to-current conversion circuit at the back end. The non-inverting input of the third amplifier is connected to the inverting input of the second amplifier, the output of the third amplifier is connected to V-OUT, and the inverting input of the third amplifier is directly connected to its output.

[0014] Preferably, the voltage-to-current conversion circuit includes a first switching transistor, the first terminal of which is connected to the proportional valve control circuit through a second resistor, the second terminal of which is connected to a V voltage source, and the third terminal of which is connected to the output terminal of the second amplifier through a tenth resistor. The proportional valve control circuit includes a third resistor and a tenth capacitor connected in series. The third resistor and the tenth capacitor are connected in parallel with the first diode and then connected to the proportional valve. The first end of the proportional valve is connected to the second resistor.

[0015] Preferably, the first switching transistor is a bipolar transistor.

[0016] Compared with the prior art, the beneficial effects of this utility model are: 1. The optimized design ensures that all components are domestically produced, resulting in a reliable structure, long service life, low procurement costs, short production cycles, and quick replacement of parts; 2. The hardware control method is simple, with strong anti-interference ability, and all parts are standardized, making it convenient to replace parts and repair. 3. The same electronic pressure controller can be set with multiple pressure values ​​to meet the needs of various scenarios, and can be adjusted and replaced. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the valve base of this utility model; Figure 3 This is a schematic diagram of the valve base and the bottom of the circuit board of this utility model; Figure 4 This is a schematic cross-sectional view of the valve base of this utility model; Figure 5 This is a schematic diagram of the outer shell of this utility model; Figure 6 This is a schematic diagram of the outer shell of this utility model; Figure 7 This is the circuit schematic diagram of this utility model.

[0018] In the diagram: 1. Valve base; 11. Valve base air inlet pipe; 12. Valve base air outlet pipe; 13. Valve base air inlet; 14. Valve base air outlet; 15. Pressure sensing channel; 2. Proportional valve; 21. Proportional valve air inlet; 22. Proportional valve air outlet; 3. Feedback module; 31. Circuit board; 311. Circuit board connector; 32. Pressure sensor; 4. Housing; 41. Housing air inlet; 42. Housing air outlet; 43. Window; 7. Sealing ring. Detailed Implementation

[0019] A preferred embodiment of the present invention will now be described in conjunction with the accompanying drawings, providing a clear and complete description of the technical solution in this preferred embodiment.

[0020] like Figure 1 and Figure 7 As shown: A miniature electronic pressure controller includes a valve base 1, a proportional valve 2 and a pressure feedback module 3 arranged side by side above the valve base 1, and the pressure feedback module 3 includes a circuit board 31 and a pressure sensor 32 integrated on the circuit board 31. The proportional valve 2 has a proportional valve inlet 21 and a proportional valve outlet 22. The valve base 1 is provided with a valve base inlet pipe 11 for connecting to a gas source and a valve base outlet pipe 12 for conveying regulated gas. The valve base 1 is provided with a valve base inlet 13 for connecting to the proportional valve inlet 21 and a valve base outlet 14 for connecting to the proportional valve outlet 22. The valve base 1 is also provided with a pressure sensing channel 15 for mounting the pressure sensor 32, and the pressure sensing channel 15 is connected to the air outlet pipe 12 of the valve base.

[0021] Through the above design, this utility model connects the air pressure source to the valve base inlet pipe 11. The air pressure source enters the proportional valve 2 from the proportional valve inlet 21. The system provides a voltage of 0V-5V, and the proportional valve 2 changes from normally closed to normally open. The air pressure source passes through the proportional valve outlet 22 and the valve base outlet 14 in sequence to reach the valve base outlet pipe 12. The valve base outlet pipe 12 is connected to the pressure sensing channel 15. The pressure sensor 32 converts the detected pressure value into a voltage value and feeds it back to the error amplifier.

[0022] Pressure sensor 32 detects a pressure change and converts the changed pressure value into a changed voltage value, which is fed back to the instrumentation amplifier. The instrumentation amplifier amplifies and processes the changed voltage signal and sends a control signal to the error amplifier. The error amplifier receives and amplifies the control signal and sends a control signal to the pressure-flow conversion circuit. The pressure-flow conversion circuit controls the current in one path of the proportional valve control circuit, adjusting the opening degree of the proportional valve, thereby adjusting the output air volume. At this time, the pressure value will also change, and the new pressure value returns to the pressure sensor to form negative feedback regulation, eventually reaching a balance and forming a stable air pressure and airflow.

[0023] like Figure 1 and Figure 2 As shown: Specifically, the proportional valve 2 and the circuit board 31 are assembled and installed onto the valve base by fastening screws.

[0024] In this utility model, through the above design, the proportional valve 2 and the valve base 1 are connected by a first fastening screw 5, and the proportional valve 2 and the valve base 1 are provided with a first mounting hole 51 that matches the first fastening screw 5.

[0025] The pressure sensor 32 is connected to the valve base 1 by a second fastening screw 6, and the circuit board 31 and the valve base 1 are provided with a second mounting hole 61 that matches the second fastening screw 6.

[0026] Specifically, a sealing ring 7 is provided between the proportional valve inlet 21 and the valve base inlet 13, and a sealing ring 7 is provided between the proportional valve outlet 22 and the valve base outlet 14.

[0027] Through the above design, this utility model achieves a stronger seal between the proportional valve 2 and the valve base 1.

[0028] Specifically, it also includes a housing 4, which has a housing air inlet 41 connected to the valve base air inlet pipe 11 and a housing air outlet 42 connected to the valve base air outlet pipe 12. Specifically, the housing 4 has a window 43 corresponding to the circuit board connector 311 on the circuit board 31.

[0029] Specifically, the circuit board 31 integrates an instrumentation amplifier, an error amplifier, a pressure-to-current conversion circuit, and a proportional valve control circuit. One end of the instrumentation amplifier is connected to the pressure sensor 32, and the other end of the instrumentation amplifier is connected to the error amplifier. The error amplifier is connected to the proportional valve control circuit through the pressure-to-current conversion circuit, and the proportional valve control circuit is connected to the proportional valve 2.

[0030] The instrumentation amplifier includes a fifth amplifier U5, wherein the inverting input terminal of the fifth amplifier U5 is connected to the first and sixth pins of the pressure sensor 32 through the sixteenth sliding resistor R16, the non-inverting input terminal of the fifth amplifier U5 is connected to the fourth pin of the pressure sensor 32, and the output terminal of the fifth amplifier U5 is connected to the error amplifier.

[0031] The error amplifier includes a second amplifier U2 and a third amplifier U23. The inverting input of the second amplifier U2 is connected to the output of the fifth amplifier U5 through the seventeenth resistor R17. The non-inverting input of the second amplifier U2 is connected to V-IN. A ninth resistor R9 and a third capacitor C3 are connected in parallel between the inverting input and the output of the second amplifier U2. The output of the second amplifier U2 is connected to the voltage-to-current conversion circuit at the back end. The non-inverting input terminal of the third amplifier U3 is connected to the inverting input terminal of the second amplifier U2, the output terminal of the third amplifier U3 is connected to V-OUT, and the inverting input terminal of the third amplifier U3 is directly connected to its output terminal.

[0032] The voltage-current conversion circuit includes a first switching transistor Q1. The first terminal of the first switching transistor Q1 is connected to the proportional valve control circuit through a second resistor R2. The second terminal of the first switching transistor Q1 is connected to a 24V voltage source. The third terminal of the first switching transistor Q1 is connected to the output terminal of the second amplifier U2 through a tenth resistor R10. The proportional valve control circuit includes a third resistor R3 and a tenth capacitor C10 connected in series. The third resistor R3 and the tenth capacitor C10 are connected in parallel with the first diode D1 and then connected to the proportional valve 2. The first end of the proportional valve is connected to the second resistor R2.

[0033] Specifically, the first switch Q1 is a bipolar transistor.

[0034] This utility model, through the above design, sequentially connects an instrumentation amplifier, an error amplifier, a pressure-to-flow conversion circuit, and a proportional valve control circuit. The instrumentation amplifier is electrically connected to the pressure sensor 32, used to amplify and process the gas source pressure change signal collected by the pressure sensor 32, and send a control signal to the error amplifier. The error amplifier is used to receive and amplify the control signal, and send a control signal to the pressure-to-flow conversion circuit. The pressure-to-flow conversion circuit controls the current of the proportional valve control circuit according to the control signal, thereby adjusting the opening degree of the proportional valve 2.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A miniature electronic pressure controller, characterized in that: It includes a valve base (1), a proportional valve (2) and a pressure feedback module (3) arranged side by side above the valve base (1), and the pressure feedback module (3) includes a circuit board (31) and a pressure sensor (32) integrated on the circuit board (31). The proportional valve (2) has a proportional valve inlet (21) and a proportional valve outlet (22). The valve base (1) is provided with a valve base inlet pipe (11) for connecting to the gas source and a valve base outlet pipe (12) for conveying the pressure-stabilized gas. The valve base (1) is provided with a valve base inlet port (13) for connecting to the proportional valve inlet port (21) and a valve base outlet port (14) for connecting to the proportional valve outlet port (22). The valve base (1) is also provided with a pressure sensing channel (15) for mounting the pressure sensor (32), and the pressure sensing channel (15) is connected to the valve base outlet pipe (12).

2. The miniature electronic pressure controller according to claim 1, characterized in that: The proportional valve (2) and the circuit board (31) are assembled and installed on the valve base by fastening screws.

3. The miniature electronic pressure controller according to claim 1, characterized in that: A sealing ring (7) is provided between the proportional valve inlet (21) and the valve base inlet (13), and a sealing ring (7) is provided between the proportional valve outlet (22) and the valve base outlet (14).

4. The miniature electronic pressure controller according to claim 1, characterized in that: It also includes a housing (4), which has a housing inlet (41) connected to the valve base inlet pipe (11) and a housing outlet (42) connected to the valve base outlet pipe (12).

5. The miniature electronic pressure controller according to claim 4, characterized in that: The outer casing (4) has a window (43) corresponding to the circuit board connector (311) on the circuit board (31).

6. The miniature electronic pressure controller according to claim 1, characterized in that: The circuit board (31) integrates an instrumentation amplifier, an error amplifier, a pressure-to-current conversion circuit, and a proportional valve control circuit. One end of the instrumentation amplifier is connected to the pressure sensor, and the other end of the instrumentation amplifier is connected to the error amplifier. The error amplifier is connected to the proportional valve control circuit through the pressure-to-current conversion circuit, and the proportional valve control circuit is connected to the proportional valve.

7. The miniature electronic pressure controller according to claim 6, characterized in that: The instrumentation amplifier includes a fifth amplifier, wherein the inverting input terminal of the fifth amplifier is connected to the first and sixth pins of the pressure sensor through a sixteenth sliding resistor, the non-inverting input terminal of the fifth amplifier is connected to the fourth pin of the pressure sensor, and the output terminal of the fifth amplifier is connected to the error amplifier.

8. The miniature electronic pressure controller according to claim 7, characterized in that: The error amplifier includes a second amplifier and a third amplifier. The inverting input of the second amplifier is connected to the output of the fifth amplifier through a seventeenth resistor. The non-inverting input of the second amplifier is connected to V-IN. A ninth resistor and a third capacitor are connected in parallel between the inverting input and the output of the second amplifier. The output of the second amplifier is connected to the voltage-current conversion circuit at the back end. The non-inverting input of the third amplifier is connected to the inverting input of the second amplifier, the output of the third amplifier is connected to V-OUT, and the inverting input of the third amplifier is directly connected to its output.

9. The miniature electronic pressure controller according to claim 8, characterized in that: The voltage-to-current conversion circuit includes a first switching transistor, the first terminal of which is connected to the proportional valve control circuit through a second resistor, the second terminal of which is connected to a 24V voltage source, and the third terminal of which is connected to the output terminal of the second amplifier through a tenth resistor. The proportional valve control circuit includes a third resistor and a tenth capacitor connected in series. The third resistor and the tenth capacitor are connected in parallel with the first diode and then connected to the proportional valve (2). The first end of the proportional valve is connected to the second resistor.

10. The miniature electronic pressure controller according to claim 9, characterized in that: The first switching transistor is a bipolar transistor.

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