Electric proportional valve

Abstract

The utility model relates to an electric proportional valve which comprises a valve body, a circuit board control module, a diaphragm assembly, an ejector rod, an upper valve element assembly and a lower valve element assembly, the valve body comprises a base, a lower valve body, a middle valve body, an upper valve body and a cover body, and a diaphragm cavity used for containing the diaphragm assembly is formed between the upper valve body and the middle valve body. A valve cavity used for containing the upper valve element assembly and the lower valve element assembly is formed among the lower valve body, the middle valve body and the base, a pilot control cavity is formed between the diaphragm assembly and the upper valve body, and the circuit board control module comprises a control circuit board, keys, a display screen, an air supply pilot electromagnetic valve and an exhaust pilot electromagnetic valve. The lower valve body is provided with an air inlet and an air outlet which are communicated with the valve cavity, the ejector rod acts along with the diaphragm assembly and drives the upper valve element assembly and the lower valve element assembly to act, and opening or closing of the valve cavity is achieved. The utility model has the advantages of simple structure, stable and reliable performance, convenient assembly and convenient operation.

Description

Technical Field

[0001] The utility model relates to the technical field of pneumatic components, in particular to an electric proportional valve. Background Art

[0002] The electric proportional valve is a device that uses electrical signals to control gas pressure and flow. It controls gas pressure through electrical signals, can achieve continuous and stepless regulation of gas pressure, can achieve remote control and program control, and is also a major component in pneumatic industrial automation systems. The internal structure of the existing electric proportional valve cannot be integrated into modularization, modular assembly cannot be achieved, and assembly is inconvenient. In addition, the electric proportional valve also has the defects of complex structure, unreliable performance, and inconvenient operation. Summary of the invention

[0003] The utility model aims to overcome the defects of the prior art and provide an electric proportional valve with simple structure, stable and reliable performance, convenient assembly and convenient operation.

[0004] To achieve the above-mentioned purpose, the utility model adopts an electric proportional valve, including a valve body, a circuit board control module, a diaphragm assembly, a push rod that cooperates with the diaphragm assembly, an upper valve core assembly, and a lower valve core assembly. The valve body includes a base, a lower valve body arranged on the base, a middle valve body arranged on the lower valve body, an upper valve body arranged on the middle valve body, and a cover body arranged on the upper valve body. A accommodating cavity for placing the circuit board control module is formed between the upper valve body and the cover body, a diaphragm cavity for placing the diaphragm assembly is formed between the upper valve body and the middle valve body, and a diaphragm cavity for placing the diaphragm assembly is formed between the lower valve body, the middle valve body, and the base. There is a valve cavity for placing an upper valve core assembly and a lower valve core assembly, a pilot control cavity is formed between the diaphragm assembly and the upper valve body, the circuit board control module includes a control circuit board, buttons arranged on the control circuit board, a display screen arranged on the control circuit board, an air supply pilot solenoid valve for controlling the air supply of the pilot control cavity, and an exhaust pilot solenoid valve for controlling the exhaust of the pilot control cavity, the lower valve body is respectively provided with an air inlet and an air outlet connected to the valve cavity, the push rod moves with the diaphragm assembly and respectively drives the upper valve core assembly and the lower valve core assembly to move, and realizes the opening or closing of the valve cavity.

[0005] The beneficial effects of the above structure are as follows: This electro-hydraulic proportional valve has the advantages of simple structure, stable and reliable performance, convenient assembly, and convenient operation. Moreover, the control circuit board module, diaphragm assembly, upper spool assembly, and lower spool assembly adopt modular structure design, which is conducive to realizing the modular assembly of this electro-hydraulic proportional valve and has higher assembly efficiency. The working principle of this electro-hydraulic proportional valve is as follows: When the input signal increases, the supply pilot solenoid valve is in the ON state, while the exhaust pilot solenoid valve is in the OFF state. The supply pressure enters the pilot control chamber from the air inlet through the supply pilot solenoid valve, and the pressure in the pilot control chamber rises. The air pressure acts on the upper part of the diaphragm assembly, and the diaphragm assembly moves downward. The diaphragm assembly drives the push rod to move, and the push rod drives the lower spool assembly to move, so that the lower spool assembly opens, generating an output pressure. The output pressure is fed back to the control loop through the pressure sensor, and thus is quickly compared and corrected with the target value until the output pressure is proportional to the input signal, so as to obtain a proportional change in the output pressure with the change of the input signal and realize the boosting function; When the signal decreases, the exhaust pilot solenoid valve becomes in the ON state, and the air pressure in the pilot control chamber is discharged from the exhaust port. The diaphragm assembly moves upward, and the upper spool assembly loses the restriction of the diaphragm assembly and opens. The pressure at the air outlet is discharged from the exhaust port, and the opening size of the associated lower spool assembly decreases. The pressure sensor feeds back the output pressure to the control loop and quickly compares and corrects it with the input signal target value to obtain a pressure value where the input signal and the output pressure are consistent. At the same time, the supply pilot solenoid valve switches to the OFF state to realize the decompression function.

[0006] Particularly, the upper spool assembly is slidably arranged in the middle valve body and includes an upper spool that cooperates with the lower valve body, and a spring arranged between the upper spool and the middle valve body. An open circlip that cooperates with the upper spool is arranged on the push rod. The open circlip moves with the push rod and drives the upper spool to move, and realizes the opening or closing of the valve cavity. The upper spool assembly adopts a modular structure design, which is convenient for the assembly of the upper spool assembly and the middle valve body, and can ensure more reliable transmission between the diaphragm assembly and the lower spool assembly.

[0007] Particularly, the lower spool assembly includes a lower spool that is slidably arranged in the base and cooperates with the lower valve body, and a compression spring arranged between the lower spool and the base. One end of the push rod has a driving part that cooperates with the lower spool. The driving part moves with the push rod and abuts against the lower spool, and realizes the opening or closing of the valve cavity. The lower spool assembly adopts a modular structure design, which is convenient for the assembly of the lower spool assembly and the base, and can ensure more reliable transmission between the diaphragm assembly and the lower spool assembly.

[0008] Specifically, the other end of the ejector rod has a clamping portion that cooperates with the diaphragm assembly. A clamping groove that cooperates with the clamping portion is provided on the diaphragm assembly. The clamping portion is clamped in the clamping groove, forming a clamping fit between the ejector rod and the diaphragm assembly. The ejector rod and the diaphragm assembly are assembled by means of a clamping fit, which has a higher assembly efficiency.

[0009] Specifically, feedback air holes communicating with the air inlet and the air outlet are respectively provided in the lower valve body. A pressure sensor electrically connected to the control circuit board is provided in the feedback air holes. The pressure signal of the pressure sensor is fed back to the control circuit board to achieve the feedback of the pressure signal, which is beneficial to improving the working reliability of the electro-hydraulic proportional valve.

[0010] Specifically, a balance spring is provided between the diaphragm assembly and the lower valve body. The balance spring can ensure the reliable and stable operation of the diaphragm assembly, which is beneficial to improving the working reliability of the electro-hydraulic proportional valve. Description of the Drawings

[0011] Figure 1 This is a perspective view of an embodiment of the present invention.

[0012] Figure 2 This is a cross-sectional view of an embodiment of the present invention.

[0013] Figure 3 This is an exploded view of an embodiment of the present invention. Detailed Embodiment

[0014] As Figures 1 to 3As shown, the embodiment of the utility model is an electric proportional valve, including a valve body 10, a circuit board control module 20, a diaphragm assembly 12, a push rod 13 linked with the diaphragm assembly 12, an upper valve core assembly 30, and a lower valve core assembly 40. The valve body 10 includes a base 101, a lower valve body 102 arranged on the base 101, a middle valve body 103 arranged on the lower valve body 102, an upper valve body 104 arranged on the middle valve body 103, and a cover body 105 arranged on the upper valve body 104. A accommodating cavity 1000 for placing the circuit board control module 20 is formed between the upper valve body 104 and the cover body 105. A diaphragm cavity 1001 for placing the diaphragm assembly 12 is formed between the upper valve body 104 and the middle valve body 103. The lower valve body 102 and the middle valve body 103, as well as the base 101 are connected. A valve cavity 1002 for accommodating an upper valve core assembly 30 and a lower valve core assembly 40 is formed therebetween, a pilot control cavity 1003 is formed between the diaphragm assembly 12 and the upper valve body 102, the circuit board control module 20 comprises a control circuit board 21, a button 22 arranged on the control circuit board 21, a display screen 23 arranged on the control circuit board 21, an air supply pilot solenoid valve 24 for controlling the air supply to the pilot control cavity 1003, and an exhaust pilot solenoid valve 25 for controlling the exhaust of the pilot control cavity 1003, the lower valve body 102 is respectively provided with an air inlet 1021 and an air outlet 1022 connected to the valve cavity 1002, the push rod 13 moves with the diaphragm assembly 12 and respectively drives the upper valve core assembly 30 and the lower valve core assembly 40 to move, and realizes the opening or closing of the valve cavity 1002.

[0015] like Figure 2As shown, the upper spool assembly 30 is slidably disposed in the middle valve body 103 and includes an upper spool 31 that cooperates with the lower valve body 102, and a spring 32 disposed between the upper spool 31 and the middle valve body 103. An open retaining ring 131 that cooperates with the upper spool 31 is provided on the push rod 13. The open retaining ring 131 moves with the push rod 13 and drives the upper spool 31 to move, thereby opening or closing the valve cavity 1002. The upper spool assembly is designed with a modular structure, which facilitates the assembly of the upper spool assembly and the middle valve body, and can ensure more reliable transmission between the diaphragm assembly and the lower spool assembly. The lower spool assembly 40 includes a lower spool 41 that is slidably disposed in the base 101 and cooperates with the lower valve body 102, and a compression spring 42 disposed between the lower spool 41 and the base 101. One end of the push rod 13 has a driving portion 132 that cooperates with the lower spool 41. The driving portion 132 moves with the push rod 13 and abuts against the lower spool 41, thereby opening or closing the valve cavity 1002. The lower spool assembly is designed with a modular structure, which facilitates the assembly of the lower spool assembly and the base, and can ensure more reliable transmission between the diaphragm assembly and the lower spool assembly. The other end of the push rod 13 has a clamping portion 133 that cooperates with the diaphragm assembly 12. A clamping groove 121 that cooperates with the clamping portion 133 is provided on the diaphragm assembly 12. The clamping portion 133 is clamped in the clamping groove 121, thereby forming a clamping fit between the push rod 13 and the diaphragm assembly 12. The push rod and the diaphragm assembly are assembled by a clamping fit method, which has higher assembly efficiency. A feedback air hole 1023 that communicates with the air inlet 1021 and the air outlet 1022 is respectively provided in the lower valve body 102. A pressure sensor 14 that is electrically connected to the control circuit board 21 is provided in the feedback air hole 1023. The pressure signal of the pressure sensor is fed back to the control circuit board to realize the feedback of the pressure signal, which is beneficial to improving the working reliability of the electro-hydraulic proportional valve. A balance spring 15 is provided between the diaphragm assembly 12 and the lower valve body 102. The balance spring can ensure the reliable and stable movement of the diaphragm assembly, which is beneficial to improving the working reliability of the electro-hydraulic proportional valve.

[0016] This electro-hydraulic proportional valve has the advantages of simple structure, stable and reliable performance, convenient assembly and operation. Moreover, the control circuit board module, diaphragm assembly, upper spool assembly and lower spool assembly are respectively designed with a modular structure, which is conducive to realizing the modular assembly of the electro-hydraulic proportional valve and has higher assembly efficiency. The working principle of this electro-hydraulic proportional valve is as follows: when the input signal increases, the supply pilot solenoid valve is in the ON state, while the exhaust pilot solenoid valve is in the OFF state. The supply pressure enters the pilot control chamber from the air inlet through the supply pilot solenoid valve. The pressure in the pilot control chamber rises, and the air pressure acts on the upper part of the diaphragm assembly. The diaphragm assembly moves downward, driving the push rod to move, and the push rod drives the lower spool assembly to move. As a result, the lower spool assembly opens, generating an output pressure. The output pressure is fed back to the control loop through the pressure sensor, and is quickly compared and corrected with the target value until the output pressure is proportional to the input signal, so as to obtain a proportional change in the output pressure with the change of the input signal and realize the boosting function; when the signal decreases, the exhaust pilot solenoid valve becomes in the ON state, and the air pressure in the pilot control chamber is discharged from the exhaust port. The diaphragm assembly moves upward, and the upper spool assembly loses the restriction of the diaphragm assembly and opens. The pressure at the air outlet is discharged from the exhaust port, and the opening size of the associated lower spool assembly decreases. The pressure sensor feeds back the output pressure to the control loop and quickly compares and corrects it with the input signal target value to obtain a pressure value where the input signal and the output pressure are consistent. At the same time, the supply pilot solenoid valve switches to the OFF state to realize the decompression function.

Claims

1. An electric proportional valve, characterized in that: The invention comprises a valve body, a circuit board control module, a diaphragm assembly, a push rod coordinated with the diaphragm assembly, an upper valve core assembly, and a lower valve core assembly. The valve body comprises a base, a lower valve body arranged on the base, a middle valve body arranged on the lower valve body, an upper valve body arranged on the middle valve body, and a cover body arranged on the upper valve body. A receiving cavity for placing the circuit board control module is formed between the upper valve body and the cover body. A diaphragm cavity for placing the diaphragm assembly is formed between the upper valve body and the middle valve body. A space for placing the upper valve core assembly, The valve cavity of the lower valve core assembly, a pilot control cavity is formed between the diaphragm assembly and the upper valve body, the circuit board control module includes a control circuit board, buttons arranged on the control circuit board, a display screen arranged on the control circuit board, an air supply pilot solenoid valve for controlling the air supply of the pilot control cavity, and an exhaust pilot solenoid valve for controlling the exhaust of the pilot control cavity. The lower valve body is respectively provided with an air inlet and an air outlet connected to the valve cavity, the push rod moves with the diaphragm assembly and respectively drives the upper valve core assembly and the lower valve core assembly to move, and realizes the opening or closing of the valve cavity.

2. The electric proportional valve according to claim 1, characterized in that: The upper valve core assembly is slidably arranged in the middle valve body and cooperates with the lower valve body, and a spring is arranged between the upper valve core and the middle valve body. The push rod is provided with an opening retaining ring that cooperates with the upper valve core. The opening retaining ring moves with the push rod and drives the upper valve core to move, thereby realizing the opening or closing of the valve cavity.

3. The electric proportional valve according to claim 1 or 2, characterized in that: The lower valve core assembly includes a lower valve core slidably arranged in the base and matched with the lower valve body, and a compression spring arranged between the lower valve core and the base. One end of the push rod has a driving part that matches the lower valve core. The driving part moves with the push rod and abuts against the lower valve core to realize the opening or closing of the valve cavity.

4. The electric proportional valve according to claim 1 or 2, characterized in that: The other end of the push rod has a clamping part matched with the diaphragm assembly, and the diaphragm assembly is provided with a clamping groove matched with the clamping part. The clamping part is clamped in the clamping groove to form a clamping fit between the push rod and the diaphragm assembly.

5. The electric proportional valve according to claim 1 or 2, characterized in that: The lower valve body is provided with feedback air holes connected with the air inlet and the air outlet respectively, and the feedback air holes are provided with pressure sensors electrically connected with the control circuit board.

6. The electric proportional valve according to claim 1 or 2, characterized in that: A balance spring is arranged between the diaphragm assembly and the lower valve body.

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