Electromagnetic pneumatic control valve and fluid control system applying same

Abstract

The electromagnetic pneumatic control valve comprises a main valve body provided with a valve port; the valve cover is arranged on the valve port in a covering manner, and an inner cavity is formed above the valve port; the valve is characterized by further comprising a diaphragm which divides the inner cavity into an upper cavity and a lower cavity, and the diaphragm opens and closes the valve port based on the change generated by the pressure difference between the upper cavity and the lower cavity; and a ventilation channel is arranged in the pilot electromagnetic valve, and the pilot electromagnetic valve comprises an electromagnetic valve element. The electromagnetic pneumatic control valve has the advantages of high response speed of a pilot electromagnetic valve and multiple types of circulating media of the pneumatic control valve, and is simple in structure, small in size and convenient to install by a user. The fluid control system applying the electromagnetic pneumatic control valve is characterized by comprising the electromagnetic pneumatic control valve, a pressure reducing valve and a check valve, a ventilation channel in the pilot electromagnetic valve is connected with a compressed air source through an air pressure regulator. According to the fluid control system, the valve opening and closing response speed after the fluid control system switches the power-on and power-off states of the coil is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic valves, and in particular to an electromagnetic gas-controlled valve and a fluid control system using the electromagnetic gas-controlled valve. Background Art

[0002] In the pipeline automatic control system, the properties of the fluid in the pipeline are different, and different valves are usually selected for fluids of different properties. For non-corrosive and low-viscosity fluid media, a general-purpose solenoid valve is usually selected, and for corrosive fluid media, a diaphragm-type anti-corrosion solenoid valve is selected to prevent the corrosive fluid medium from contacting the pilot metal components, causing the valve core to corrode and causing the solenoid valve to fail. Air-controlled valves are usually selected for situations where the fluid medium has high viscosity and the temperature change of the fluid medium must be constant.

[0003] For solenoid valves used for corrosive fluid media, there is a Chinese invention patent in the prior art with patent number ZL202011378521.2 (publication number CN114576365A) titled "A pilot diaphragm normally open solenoid valve structure", which discloses the conventional structure of a diaphragm solenoid valve. The diaphragm is used to block the corrosive fluid medium from the internal components of the solenoid valve to prevent the internal components of the solenoid valve from being corroded by the corrosive fluid medium. The interior of the diaphragm solenoid valve is provided with a piston chamber for piston movement. The space above the piston in the piston chamber is the upper chamber, and the space below the piston is the lower chamber. A balancing hole is provided on the piston to connect the upper and lower chambers in the piston chamber. The solenoid valve generates a magnetic field by the current to drive the valve core to move, destroying the pressure balance between the upper and lower chambers in the piston chamber to control the opening and closing of the main valve.

[0004] Based on the structural characteristics of the solenoid valve, the solenoid valve is not suitable for fluid media with high viscosity. The reason is that the balance hole area of ​​the solenoid valve is usually smaller than 1 / 4 of the pilot valve port area. The fluid medium with high viscosity can easily block the balance hole, and the upper chamber pressure in the piston chamber is lower than the lower chamber pressure. The main valve port cannot be closed, which leads to leakage of the solenoid valve.

[0005] In addition, in the prior art, a Chinese utility model patent with patent number ZL202321771988.2 (publication number CN220727184U) "A New Stainless Steel Air Control Valve" discloses a kind of air control valve structure, which includes a valve body and a control seat, in which an air chamber and a connecting channel are arranged, a sliding rod is installed in the connecting channel, one end of the sliding rod is connected to a diaphragm, and one end of the sliding rod in the chamber is provided with a partition part, which separates the chamber into an upper chamber and a lower chamber. When working, the pressure difference between the upper chamber and the lower chamber in the cylinder is controlled by the air source, so that the partition part moves up or down, and the partition part drives the sliding rod to drive the diaphragm in the valve body to open and close the valve port. The diaphragm of the air-controlled valve can isolate the fluid medium under the diaphragm, which can prevent the medium from entering the internal parts of the valve body and corroding the components. Due to the setting of the cylinder and the elasticity of the diaphragm itself, the force of the sliding rod on the diaphragm is sufficient to complete the action of opening and closing the valve. Therefore, there is no need to set a balancing hole, avoiding the risk of failing to close the valve when circulating a fluid medium with high viscosity.

[0006] However, the pneumatic control valve needs to input compressed air into the cylinder to generate power to control the up and down movement of the piston, thereby controlling the on and off of the fluid medium of the main valve. Compared with the solenoid valve, its response speed is slower, and the cylinder needs to be installed on the valve body. It has a complex structure, a large size, and a limited scope of application. It is not an ideal control actuator. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide an electromagnetic air-controlled valve in response to the above-mentioned existing technical status, which combines the working advantages of the electromagnetic valve and the air-controlled valve, has a fast response speed, a simple structure, and a small size. It is suitable for various fluid media, especially for fluid media with special properties such as high viscosity and strong corrosiveness.

[0008] The first technical solution adopted by the present invention to solve the above technical problems is: the electromagnetic gas control valve comprises A main valve body having a valve port for opening and closing the flow of a medium; A valve cover is arranged on the valve port of the main valve body and forms an inner cavity above the valve port; It is characterized by: it also includes a diaphragm movably disposed in the inner cavity to separate the inner cavity into an upper cavity and a lower cavity connected to the valve port, wherein the diaphragm opens and closes the valve port based on a change in the pressure difference between the upper cavity and the lower cavity; The pilot solenoid valve is provided with a ventilation channel which is communicated with the upper chamber and connected to a compressed air source. The pilot solenoid valve comprises a solenoid valve core which opens and closes the ventilation channel.

[0009] In order to increase the response speed of the diaphragm closing the valve port, further, a first elastic member acting on the diaphragm is provided in the upper chamber, and the first elastic member has a tendency to press the diaphragm to close the valve port. Since the main body of the pilot solenoid valve has a through-flow channel for circulating medium, when the pilot solenoid valve closes the ventilation channel, the gas in the upper chamber is discharged from the through-flow channel, the air pressure in the upper chamber is reduced, and the pre-compressed first elastic member provides the diaphragm with a force to deform in the direction of the valve port, so that the air pressure in the upper chamber does not need to be increased to a pressure greater than the pressure of the circulating medium, and the diaphragm can close the valve port.

[0010] In order to facilitate the control of the air pressure in the upper chamber, an auxiliary valve body is further provided between the valve cover and the pilot electromagnetic valve, and the auxiliary valve body has a first flow channel connected to the outside air, a second flow channel connected to the upper chamber and the ventilation channel, and a first auxiliary valve port for opening and closing the first flow channel and the second flow channel, and the electromagnetic valve core is set corresponding to the first auxiliary valve port to open and close the first auxiliary valve port. The setting of the first auxiliary valve port enables the electromagnetic valve core to selectively connect the ventilation channel and the first flow channel to the second flow channel when the electromagnetic valve core is in the on or off state. In addition, opening and closing the first auxiliary valve port with the electromagnetic valve core increases the execution speed of the exhaust action.

[0011] In order to reduce the noise generated when the electromagnetic air-controlled valve is exhausted, further, a muffler is connected to one end of the auxiliary valve body corresponding to the first flow channel away from the first auxiliary valve port.

[0012] Furthermore, the auxiliary valve body is connected to the pilot solenoid valve via an auxiliary valve seat.

[0013] In order to simplify the structure of the electromagnetic air-controlled valve, further, the pilot electromagnetic valve comprises an electromagnetic coil and the electromagnetic valve core arranged in the electromagnetic coil; The electromagnetic valve core comprises a fixed iron core and a movable iron core arranged below the fixed iron core so as to move up and down; The ventilation channel includes a first channel that is vertically penetrating and arranged on the fixed iron core, and a second channel that is deviated from the first channel and vertically penetrating and arranged on the moving iron core, wherein the upper end of the first channel is connected to a compressed air source, the lower end of the first channel forms a second auxiliary valve port, and the lower end of the second channel is connected to the second flow channel; The movable iron core only closes one of the first auxiliary valve port and the second auxiliary valve port based on the up and down movement. The technical solution sets the air passage in the movable iron core and the fixed iron core, and no additional valve seat is required to arrange the air path.

[0014] In order to enhance the air tightness of the moving iron core in opening and closing the first auxiliary valve port and the second auxiliary valve port, the moving iron core further includes a main body, a first seal, and a second seal. An installation hole is provided in the main body through the upper and lower ends relative to the first channel and the first auxiliary valve port. The first seal and the second seal are respectively arranged at the upper and lower ends of the installation hole.

[0015] In order to extend the service life of the first seal and the second seal, further, a second elastic member is provided in the mounting hole, and the second elastic member is contracted and connected between the first seal and the second seal. The second elastic member can reduce the impact of the first auxiliary valve port on the second seal and also reduce the impact of the second auxiliary valve port on the first seal when the moving iron core switches the first auxiliary valve port and the second auxiliary valve port.

[0016] In order to facilitate the user to access the compressed air source, further, a connection seat for an external air pipe is provided on the pilot solenoid valve at a position corresponding to the ventilation channel.

[0017] The second technical solution adopted by the present invention to solve the above technical problem is: the fluid control system is characterized by comprising the above electromagnetic gas control valve, and also comprising a pressure reducing valve connected to the inlet end of the main valve body, and a check valve connected to the outlet end of the main valve body; The ventilation channel in the pilot solenoid valve is connected to the compressed gas source through a gas pressure regulator.

[0018] Compared with the prior art, the advantages of the present invention are: 1. The diaphragm in the electromagnetic gas control valve of the present invention separates the upper cavity from the lower cavity, thereby preventing the fluid in the lower cavity from flowing into the upper cavity and preventing the components inside the electromagnetic gas control valve from contacting with the circulating medium and being corroded. Therefore, the electromagnetic gas control valve is suitable for the circulation of various fluid media, especially for the circulation of corrosive media; 2. The electromagnetic gas-controlled valve of the present invention has the advantages of fast response speed of the pilot electromagnetic valve and a wide variety of circulating media of the gas-controlled valve, and overcomes the shortcomings of the existing pilot electromagnetic valve that cannot circulate fluid media with high viscosity and strong corrosiveness, as well as the complex structure and large volume of the existing gas-controlled valve. Specifically, the pilot electromagnetic valve is used to control the on-off of the ventilation channel, and the air pressure in the ventilation channel is controlled to adjust the air pressure in the upper chamber, replacing the cylinder and the transmission sliding rod structure in the gas-controlled valve of the prior art. It has a simple structure and a small volume, and is convenient for users to install; 3. The fluid control system of the present invention uses the above-mentioned electromagnetic air-controlled valve, which speeds up the response speed of the fluid control system to open and close the valve after the coil is switched between energized and de-energized states. Among them, the check valve can prevent the fluid in the outlet channel from flowing back to push the diaphragm out of the valve port, thereby avoiding the phenomenon that the electromagnetic air-controlled valve cannot be closed; the gas pressure regulator can control the pressure of the external gas source input into the air inlet channel, and the operator can adjust the gas flow rate entering the upper chamber by operating the gas pressure regulator, which is conducive to the precise regulation of the pressure in the upper chamber; the pressure reducing valve can reduce the fluid pressure entering the lower chamber from the inlet channel, thereby avoiding the phenomenon that the first sealing member is directly pushed open due to excessive medium pressure, resulting in leakage of the circulating medium. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of the electromagnetic gas-controlled valve according to Example 1 of the present invention; Figure 2 This is a cross-sectional view of the electromagnetic gas-controlled valve of Example 1 of the present invention in the valve-open state; wherein the solid arrow is the medium flow direction, and the hollow arrow is the gas flow direction; Figure 3 This is a cross-sectional view of the electromagnetic gas-controlled valve in the closed state according to Embodiment 1 of the present invention; wherein the hollow arrow indicates the gas flow direction; Figure 4 is a cross-sectional view of a moving iron core and a fixed iron core of Embodiment 1 of the present invention; Figure 5 This is a piping diagram of a fluid control system according to Example 2 of the present invention, wherein the solid arrows represent the medium flow direction and the hollow arrows represent the gas flow direction. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below with reference to the accompanying drawings. Example 1

[0021] like Figures 1 to 4 As shown, it is a preferred embodiment of the present invention. The electromagnetic gas-controlled valve of this embodiment is mainly used for circulating fluid media. When the circulating medium is of high viscosity or corrosive nature, the traditional pilot electromagnetic valve is due to the setting of the balance hole. For corrosive media, the solenoid valve core is corroded, resulting in failure of the electromagnetic valve. For viscous fluids, the balance hole is easily blocked, resulting in the inability to close the main valve port. The pilot electromagnetic valve has the advantage of fast response speed; the traditional gas-controlled valve uses a cylinder to drive the piston rod to open and close the valve port. It has a large volume, a relatively complex structure, is inconvenient to install, and has a slow response speed, which is not conducive to the precise control of the fluid flow. Therefore, it will be beneficial to provide an electromagnetic gas-controlled valve that combines the working advantages of the electromagnetic valve and the gas-controlled valve, has a fast response speed, a simple structure, a small volume, and is suitable for various fluid media. The following will expand the detailed structural description of the electromagnetic gas-controlled valve: See also Figures 1 to 3 The electromagnetic air-controlled valve comprises a main valve body 1, a valve cover 2, a diaphragm 3 and a pilot electromagnetic valve 4, wherein the main valve body 1 has a valve port 11 for opening and closing the flow of a medium, the valve cover 2 is disposed on the valve port 11 of the main valve body 1, and an inner cavity 20 is formed above the valve port 11, the diaphragm 3 is movably disposed in the inner cavity 20, and the inner cavity 20 is partitioned into an upper cavity 21 and a lower cavity 22 connected to the valve port 11, and the diaphragm 3 opens and closes the valve port 11 based on the change in the pressure difference between the upper cavity 21 and the lower cavity 22; the pilot electromagnetic valve 4 has a built-in ventilation channel 40 connected to the upper cavity 21 and connected to a compressed air source, and the pilot electromagnetic valve 4 comprises an electromagnetic valve core 41 for opening and closing the ventilation channel 40.

[0022] A first elastic member 23 acting on the diaphragm 3 is provided in the upper chamber 21, and the first elastic member 23 has a tendency to press the diaphragm 3 to close the valve port 11. Since the main body of the pilot solenoid valve 4 has a through-flow channel for circulating medium, when the pilot solenoid valve 4 closes the ventilation channel 40, the gas in the upper chamber 21 is discharged from the through-flow channel, and the air pressure in the upper chamber 11 is reduced. The pre-compressed first elastic member 23 provides the diaphragm 3 with a force to deform in the direction of the valve port 11, so that the air pressure in the upper chamber 11 does not need to increase to a pressure greater than the circulating medium, and the diaphragm 3 can close the valve port 11, thereby increasing the response speed of the diaphragm 3 to close the valve port 11.

[0023] An auxiliary valve body 5 is provided between the valve cover 2 and the pilot solenoid valve 4. The auxiliary valve body 5 has a first flow channel 51 connected to the outside air, a second flow channel 52 connected to the upper chamber 21 and the ventilation channel 40, and a first auxiliary valve port 53 for opening and closing the first flow channel 51 and the second flow channel 52. The solenoid valve core 41 is set corresponding to the first auxiliary valve port 53 to open and close the first auxiliary valve port 53. The setting of the first auxiliary valve port 53 enables the ventilation channel 40 and the first flow channel 51 to selectively communicate with the second flow channel 52 when the solenoid valve core 41 is in the on or off state. In addition, opening and closing the first auxiliary valve port 53 by the solenoid valve core 41 increases the execution speed of the exhaust action, and facilitates the control of the air pressure in the upper chamber 11.

[0024] A muffler 6 is connected to one end of the auxiliary valve body 5 corresponding to the first flow channel 51 and away from the first auxiliary valve port 53 to reduce the noise generated when the electromagnetic gas control valve is exhausted. The auxiliary valve body 5 is connected to the pilot electromagnetic valve 4 through the auxiliary valve seat 50 .

[0025] See also Figure 4 The pilot electromagnetic valve 4 includes an electromagnetic coil 42 and an electromagnetic valve core 41 disposed in the electromagnetic coil 42. The electromagnetic valve core 41 includes a fixed iron core 411 and a moving iron core 412 disposed below the fixed iron core 411 to move up and down. A magnetic isolation tube is disposed in the electromagnetic coil corresponding to the range of motion of the moving iron core 412. The moving iron core 412 is disposed in the magnetic isolation tube. The fixed iron core 411 and the magnetic isolation tube are welded into one. The ventilation channel 40 includes a first channel 401 that is disposed vertically through the fixed iron core 411, and a second channel 402 that deviates from the first channel 401 and is disposed vertically through the moving iron core 412. The upper end of the first channel 401 is connected to a compressed air source, and the lower end of the first channel 401 forms a second auxiliary valve port 4011. The lower end of the second channel 402 is connected to the second flow channel 52. The moving iron core 412 only closes one of the first auxiliary valve port 53 and the second auxiliary valve port 4011 based on the up and down movement. This technical solution sets the air passage 40 in the moving iron core 412 and the fixed iron core 411, and there is no need to set up an additional valve seat to arrange the air path, thereby simplifying the structure of the electromagnetic air-controlled valve.

[0026] The moving iron core 412 includes a body 4121, a first sealing member 4122, and a second sealing member 4123. A mounting hole 4120 is provided in the body 4121 at a position corresponding to the first channel 401 and the first auxiliary valve port 53. The first sealing member 4122 and the second sealing member 4123 are respectively provided at the upper end and the lower end of the mounting hole 4120. The end faces of the first sealing member 4122 and the second sealing member 4123 are substantially flush with or slightly higher than the end face of the body 4121, thereby enhancing the airtightness of the moving iron core 412 in opening and closing the first auxiliary valve port 53 and the second auxiliary valve port 4011.

[0027] A second elastic member 4124 is further provided in the mounting hole 4120, and the second elastic member 4124 is contracted and connected between the first sealing member 4122 and the second sealing member 4123. The second elastic member 4124 can reduce the impact of the first auxiliary valve port 53 on the second sealing member 4123 and reduce the impact of the second auxiliary valve port 4011 on the first sealing member 4122 when the moving iron core 412 switches the first auxiliary valve port 53 and the second auxiliary valve port 4011, thereby extending the service life of the first sealing member 4122 and the second sealing member 4123.

[0028] See also Figures 1 to 3 A connection seat 7 for an external air pipe is provided on the pilot solenoid valve 4 at a position corresponding to the ventilation channel 40, which facilitates the user to access a compressed air source.

[0029] The working principle of the electromagnetic gas-controlled valve in this embodiment is: 1) Valve closing action: the electromagnetic coil 42 is powered off, the moving iron core 412 descends, the second sealing member 4123 blocks the first auxiliary valve port 53 and the second auxiliary valve port 4011 opens, the external compressed air source inputs compressed air into the first channel 401 through the connecting seat 7, and flows to the second channel 402 through the opening and closing gap between the fixed iron core 411 and the moving iron core 412, and enters the upper chamber 21 through the second flow channel 52. The air pressure in the upper chamber 21 increases, and the diaphragm 3 and the first elastic member 23 move downward to block the valve port 11; 2) Valve opening action: After the valve closing action is completed, the air pressure in the upper chamber 21 is significantly greater than the external atmospheric pressure due to the introduction of compressed air, the electromagnetic coil 42 is energized, the moving iron core 412 rises, the first sealing member 4122 blocks the second auxiliary valve port 4011 and the first auxiliary valve port 53 is opened, and the compressed air in the upper chamber 21 enters the first flow channel 51 from the second flow channel 52 and is then discharged from the muffler 6. The air pressure in the upper chamber 21 decreases, and the diaphragm 3 and the first elastic member 23 change upward to open the valve port 11.

[0030] The diaphragm in the electromagnetic air-controlled valve of the present invention separates the upper cavity from the lower cavity, preventing the fluid in the lower cavity from flowing into the upper cavity, and preventing the components inside the electromagnetic air-controlled valve from contacting with the circulating medium and being corroded. Therefore, the electromagnetic air-controlled valve is suitable for the circulation of various fluid media, especially for the circulation of corrosive media.

[0031] The electromagnetic air-controlled valve of the present invention has the advantages of fast response speed of the pilot solenoid valve and a wide variety of media flowing through the air-controlled valve, and overcomes the shortcomings of the existing pilot solenoid valve that cannot circulate fluid media with high viscosity and strong corrosiveness, and the existing air-controlled valves that have complex structures and large volumes. Specifically, an air pressure control system is used to directly control the air pressure in the upper chamber, replacing the cylinder and the transmission sliding rod structure in the air-controlled valve of the prior art. It has a simple structure, a small volume, and is convenient for users to install.

[0032] Example 2 Fluid Control System See also Figure 5 The fluid control system of this embodiment includes the electromagnetic gas-controlled valve of embodiment 1, and further includes a pressure reducing valve 8 connected to the inlet end of the main valve body 1 and a check valve 9 connected to the outlet end of the main valve body 1; the air passage 40 in the pilot solenoid valve 4 is connected to the compressed air source through the gas pressure regulator 10.

[0033] The fluid control system of the present invention applies the above-mentioned electromagnetic air-controlled valve, which speeds up the response speed of the fluid control system to opening and closing the valve after the coil is switched between energized and de-energized states. Among them, the check valve can prevent the fluid in the outlet channel from flowing back to push the diaphragm out of the valve port, thereby avoiding the phenomenon that the electromagnetic air-controlled valve cannot be closed; the gas pressure regulator can control the pressure of the external air source input into the air inlet channel, and the operator can adjust the gas flow rate entering the upper chamber by operating the gas pressure regulator, which is conducive to the precise control of the pressure in the upper chamber; the pressure reducing valve can reduce the fluid pressure entering the lower chamber from the inlet channel, thereby avoiding the phenomenon that the first blocking member is directly pushed open due to excessive medium pressure, resulting in leakage of the circulating medium.

Claims

1. Solenoid-controlled air valve, including A main valve body (1) having a valve port (11) for opening and closing the flow of a medium; A valve cover (2) is arranged on the valve port (11) of the main valve body (1) and forms an inner cavity (20) above the valve port (11); Features: Also includes a diaphragm (3) movably disposed in the inner cavity (20) to separate the inner cavity (20) into an upper cavity (21) and a lower cavity (22) connected to the valve port (11); the diaphragm (3) opens and closes the valve port (11) based on a change in the pressure difference between the upper cavity (21) and the lower cavity (22); The pilot solenoid valve (4) is provided with a ventilation channel (40) which is in communication with the upper chamber (21) and connected to a compressed air source. The pilot solenoid valve (4) comprises a solenoid valve core (41) which opens and closes the ventilation channel (40).

2. The electromagnetic gas-controlled valve according to claim 1, characterized in that: A first elastic member (23) acting on the diaphragm (3) is arranged in the upper chamber (21), and the first elastic member (23) has a tendency to press the diaphragm (3) to close the valve port (11).

3. The electromagnetic gas-controlled valve according to claim 1, characterized in that: An auxiliary valve body (5) is provided between the valve cover (2) and the pilot electromagnetic valve (4), the auxiliary valve body (5) comprising a first flow channel (51) connected to the outside air, a second flow channel (52) connected to the upper chamber (21) and the ventilation channel (40), and a first auxiliary valve port (53) for opening and closing the first flow channel (51) and the second flow channel (52), the electromagnetic valve core (41) being arranged corresponding to the first auxiliary valve port (53) to open and close the first auxiliary valve port (53).

4. The electromagnetic gas-controlled valve according to claim 3, characterized in that: A muffler (6) is connected to one end of the auxiliary valve body (5) corresponding to the first flow channel (51) and away from the first auxiliary valve port (53).

5. The electromagnetic gas-controlled valve according to claim 3, characterized in that: The auxiliary valve body (5) is connected to the pilot solenoid valve (4) via an auxiliary valve seat (50).

6. The electromagnetic gas-controlled valve according to any one of claims 3 to 5, characterized in that: The pilot electromagnetic valve (4) comprises an electromagnetic coil (42) and an electromagnetic valve core (41) arranged in the electromagnetic coil (42); The electromagnetic valve core (41) comprises a fixed iron core (411) and a movable iron core (412) arranged below the fixed iron core (411) so as to move up and down; The ventilation channel (40) comprises a first channel (401) which is vertically penetrated and arranged on the fixed iron core (411), and a second channel (402) which is offset from the first channel (401) and vertically penetrated and arranged on the moving iron core (412), wherein the upper end of the first channel (401) is connected to a compressed air source, the lower end of the first channel (401) forms a second auxiliary valve port (4011), and the lower end of the second channel (402) is connected to the second flow channel (52); The movable iron core (412) closes only one of the first auxiliary valve port (53) and the second auxiliary valve port (4011) based on the up and down movement.

7. The electromagnetic gas-controlled valve according to claim 6, characterized in that: The moving iron core (412) comprises a main body (4121), a first sealing member (4122), and a second sealing member (4123); a mounting hole (4120) is provided in the main body (4121) so as to pass through the main body (4121) at a position corresponding to the first channel (401) and the first auxiliary valve port (53); the first sealing member (4122) and the second sealing member (4123) are respectively provided at the upper end and the lower end of the mounting hole (4120).

8. The electromagnetic gas-controlled valve according to claim 7, characterized in that: A second elastic member (4124) is also provided in the mounting hole (4120), and the second elastic member (4124) is contractively connected between the first sealing member (4122) and the second sealing member (4123).

9. The electromagnetic gas-controlled valve according to any one of claims 1 to 5, characterized in that: A connection seat (7) for connecting an external air pipe is provided on the pilot solenoid valve (4) at a position corresponding to the ventilation channel (40).

10. A fluid control system, characterized in that: It comprises the electromagnetic gas-controlled valve according to any one of claims 1 to 9, and further comprises a pressure reducing valve (8) connected to the inlet end of the main valve body (1), and a check valve (9) connected to the outlet end of the main valve body (1); The air vent channel (40) in the pilot solenoid valve (4) is connected to a compressed air source via a gas pressure regulator (10).

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