Large-flow pilot-operated type electromagnetic valve

Abstract

The invention discloses a large-flow pilot-operated type electromagnetic valve which comprises a pilot-operated valve, a main valve and a stainless steel pipe. Wherein the main valve is provided with an air inlet, an air outlet and a discharge port; electromagnetic valve control gas and main valve gas supply are shared, and gas of a main valve gas inlet is introduced into a pilot valve through a stainless steel pipe. The large-flow pilot-operated type electromagnetic valve has the advantages of being large in flow, low in power consumption, good in sealing performance, resistant to high pressure, high in response speed, long in service life, high in reliability and the like, and is suitable for a low-power-consumption, large-flow and high-pressure gas circuit control system.

Description

Technical Field

[0001] The invention belongs to the technical field of solenoid valve design, and in particular relates to a large-flow pilot solenoid valve. Background Art

[0002] The main disadvantages of existing pilot solenoid valve products are slow response speed, poor sealing, easy wear of seals, and low pressure resistance. Therefore, it is urgent to develop a pilot solenoid valve with large flow, fast response, good sealing performance and long life to meet the needs of gas control systems in various industries. Summary of the invention

[0003] The technology of the present invention solves the problem: overcomes the shortcomings of the prior art and provides a large-flow pilot solenoid valve with the advantages of large flow, low power consumption, good sealing performance, high pressure resistance, fast response speed, long life, high reliability, etc., and is suitable for low-power consumption, large-flow, high-pressure gas circuit control systems.

[0004] In order to solve the above technical problems, the present invention discloses a large-flow pilot solenoid valve, comprising: a pilot valve, a main valve and a stainless steel pipe; wherein the main valve is provided with an air inlet, a discharge port and an air outlet; the solenoid valve control gas is shared with the main valve air supply, and the gas at the air inlet is introduced into the pilot valve through the stainless steel pipe.

[0005] In the above-mentioned large-flow pilot solenoid valve, the main valve includes: a main valve seat, a main valve body, a main valve reversing valve core assembly, a reversing piston, a valve cover, a main valve return spring, an end cover and an annular seal; wherein the main valve body is installed on the main valve seat and is encapsulated by the valve cover and the end cover; the main valve reversing valve core assembly is installed in the inner cavity of the main valve body through an annular seal; the main valve return spring and the reversing piston are arranged in the inner cavity of the main valve body, respectively located at the left and right ends of the main valve reversing valve core assembly; the pilot valve is connected to the valve cover by screws.

[0006] In the above-mentioned large-flow pilot solenoid valve, the main valve reversing valve core assembly includes: a shaft, a locking nut, an anti-loosening gasket, a copper gasket, an end face sealing ring, a positioning valve core and a valve core sealing gasket; wherein the anti-loosening gasket, the copper gasket, the end face sealing ring and the positioning valve core are all mounted on the shaft; the two end face sealing rings are respectively arranged at the left and right ends of the positioning valve core and are locked by the locking nut; the anti-loosening gasket and the copper gasket are arranged between the locking nut and the end face sealing ring; the valve core sealing gasket is of a special shape and is bonded to the annular groove of the end face sealing ring by a vulcanization process.

[0007] In the above-mentioned large-flow pilot solenoid valve, the pilot valve includes: a pilot valve body, a manual switch, an O-ring, an electromagnetic coil, a static valve core assembly, a locking nut, a dynamic valve core assembly, a pilot valve reset spring and an air inlet valve nozzle; wherein the electromagnetic coil is located at the upper part of the pilot valve body, and an opening is provided at the top; the static valve core assembly is screwed into the pilot valve body through the lower end thread, and together with the pilot valve body forms a pilot valve cavity; the O-ring is installed in the annular groove at the end of the lower end thread of the static valve core assembly, and contacts with the side wall of the inner hole of the pilot valve body to achieve sealing, so as to prevent the gas in the pilot valve cavity from leaking out; the top of the static valve core assembly extends from the opening at the top of the electromagnetic coil to the outside of the electromagnetic coil; the part of the static valve core assembly extending from the outside of the electromagnetic coil is a threaded structure, which is used to connect the locking nut, and the electromagnetic coil is pressed against the pilot valve body by tightening the locking nut; the bottom end of the static valve core assembly is provided with a cylindrical through hole with an opening at the lower end, and the dynamic ... The valve core assembly is installed in the cylindrical through hole; the lower end of the moving valve core assembly is a conical structure, and the pilot valve return spring is a conical spring; one end of the pilot valve return spring is sleeved on the conical structure at the lower end of the moving valve core assembly, and is limited by the conical structure at the lower end of the moving valve core assembly; the other end of the pilot valve return spring is in contact with the static valve core assembly, and the pilot valve return spring is pre-tightened and compressed by the static valve core assembly; the pilot valve return spring applies spring force to the moving valve core assembly, so that the bottom end of the moving valve core assembly contacts the inlet valve nozzle, and presses against the control gas inlet A set at the bottom of the pilot valve body; a cylindrical step hole is set in the center of the inner cavity of the pilot valve body for installing the inlet valve nozzle, and the inlet valve nozzle and the pilot valve body are interference fit, and the fitting surface is coated with sealant to prevent gas leakage; the manual switch is installed into the pilot valve body through the cylindrical hole on the right side of the pilot valve body, and the manual switch is clamped by the circular ring at the lower end of the static valve core assembly to prevent it from coming out.

[0008] In the above-mentioned large-flow pilot solenoid valve, the main valve seat is provided with connection port I, connection port M, exhaust port N, connection port O, connection port P and connection port Q; the main valve body is provided with connection port G, connection port H, connection port J, connection port K and connection port L; the valve cover is provided with connection port II, connection port E and connection port F; the bottom of the pilot valve body is provided with a control gas inlet A and a control gas outlet B; the middle of the top of the static valve core assembly is provided with an exhaust port C connected to the outside; wherein, one end of the stainless steel pipe is connected to the connection port I through a straight-through ferrule, and the other end is connected to the connection port II through a straight-through ferrule, so as to pass the intake air The gas from the connecting port is introduced into the inner cavity of the valve cover; the control gas inlet A and the control gas outlet B are both connected to the valve cavity of the pilot valve; the upper side of the connecting port E is connected to the control gas inlet A, and the lower side is connected to the inner cavity of the valve cover; the upper side of the connecting port F is connected to the control gas outlet B, and the lower side is connected to the connecting port G; so that the control gas enters the piston cavity on the right side of the reversing piston to achieve the purpose of reversing; the connecting port H is connected to the connecting port M and the exhaust port N, and finally realizes communication with the outside atmosphere; the connecting port J is connected to the connecting port O and the air inlet; the connecting port K is connected to the connecting port P and the air outlet; the connecting port L is connected to the connecting port Q and the discharge port.

[0009] In the above-mentioned large-flow pilot solenoid valve, the moving valve core assembly includes: a moving valve core, a buffer spring, an exhaust port sealing gasket and an air inlet sealing gasket; wherein, a special-shaped cavity is provided at the upper end of the moving valve core, a through hole is provided on the side, and a dovetail groove is provided at the lower end; the air inlet sealing gasket is pasted in the dovetail groove of the moving valve core through a vulcanization process; the buffer spring is located in the cavity inside the moving valve core and is placed under the exhaust port sealing gasket; the exhaust port sealing gasket is pressed into the special-shaped cavity inside the moving valve core, one end compresses the buffer spring, and the other end is close to the upper end boss to prevent the exhaust port sealing gasket from slipping.

[0010] In the above-mentioned large-flow pilot solenoid valve, the air inlet sealing gasket is used to contact the cutting edge of the air inlet valve nozzle to form a seal when the large-flow pilot solenoid valve is in the "closed" state; the exhaust port sealing gasket is used to contact the cutting edge of the static valve core assembly to form a seal when the large-flow pilot solenoid valve is in the "open" state.

[0011] In the above-mentioned large-flow pilot solenoid valve, the buffer spring is used to compress and produce displacement when the external force applied to the exhaust port sealing gasket is greater than the set sealing spring force, thereby achieving buffering and preventing the exhaust port sealing gasket from being subjected to excessive stress, thereby avoiding damage to the exhaust port sealing gasket.

[0012] In the above-mentioned large-flow pilot-operated solenoid valve, a plurality of guide grooves are opened on the cylindrical surface of the moving valve core, which are used to connect the control gas outlet B and the exhaust port C.

[0013] In the above-mentioned large-flow pilot solenoid valve, when the solenoid coil fails or there is no power supply: if the solenoid valve needs to be opened, the manual switch is manually turned 180° clockwise to open the solenoid valve, so that the control gas inlet A and the control gas outlet B are connected; if the solenoid valve needs to be closed, the manual switch is manually turned 180° counterclockwise to close the solenoid valve, so that the control gas inlet A is cut off, and the control gas outlet B and the exhaust port C are connected.

[0014] The present invention has the following advantages:

[0015] (1) The present invention discloses a large flow pilot solenoid valve, which has the advantages of large flow, low power consumption, good sealing performance, high pressure resistance, fast response speed, long life, high reliability, etc., and is suitable for low power consumption, large flow, high pressure gas circuit control systems.

[0016] (2) The present invention discloses a large-flow pilot solenoid valve, in which an axial soft seat seal (a seal formed by the valve core seal and the cutting edge of the main valve body) is adopted between the main valve reversing valve core assembly and the main valve body. The sealing force is provided by the main valve return spring and the working gas pressure difference. The valve core seal does not wear during the switching process, and reliable sealing can be achieved for multiple switches, with a long service life.

[0017] (3) The present invention discloses a large-flow pilot solenoid valve, in which an anti-loosening gasket, a copper gasket, an end face sealing ring and a positioning valve core are assembled on the same axis, thereby ensuring axial coaxiality, reducing the probability of the main valve reversing valve core assembly getting stuck during movement, and facilitating maintenance.

[0018] (4) The present invention discloses a large flow pilot solenoid valve, which is provided with a manual switch. When the electromagnetic coil fails or there is no power supply, the manual switch can be manually turned to realize the on / off operation of the pilot solenoid valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a large flow pilot solenoid valve in an embodiment of the present invention;

[0020] Figure 2 is a structural schematic diagram of a main valve in an embodiment of the present invention;

[0021] Figure 3 It is a structural schematic diagram of a main valve reversing valve core assembly in an embodiment of the present invention;

[0022] Figure 4 is a structural schematic diagram of a valve cover in an embodiment of the present invention;

[0023] Figure 5 It is a structural schematic diagram of a main valve body in an embodiment of the present invention;

[0024] Figure 6 is a schematic structural diagram of a pilot valve in an embodiment of the present invention;

[0025] Figure 7 It is a structural schematic diagram of a moving valve core assembly in an embodiment of the present invention;

[0026] Figure 8 It is a structural schematic diagram of a main valve seat in an embodiment of the present invention. DETAILED DESCRIPTION

[0027] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments disclosed in the present invention will be further described in detail below with reference to the accompanying drawings.

[0028] Reference Figure 1 In this embodiment, the large flow pilot solenoid valve comprises: a pilot valve 1, a main valve 2 and a stainless steel pipe 3. The main valve 2 is provided with an air inlet 4, a discharge port 5 and an air outlet 6; the solenoid valve control gas is shared with the main valve gas supply, and the gas at the air inlet 4 is introduced into the pilot valve 1 through the stainless steel pipe 3 to realize the function of the large flow pilot solenoid valve.

[0029] In this embodiment, if Figure 2 As shown, the main valve 2 mainly includes: a main valve seat 201, a main valve body 202, a main valve reversing valve core assembly 203, a reversing piston 204, a valve cover 205, a main valve reset spring 206, an end cover 207 and an annular seal 209. The main valve body 202 is installed on the main valve seat 201 and is encapsulated by the valve cover 205 and the end cover 207; the main valve reversing valve core assembly 203 is installed in the inner cavity of the main valve body 202 through the annular seal 209; the main valve reset spring 206 and the reversing piston 204 are arranged in the inner cavity of the main valve body 202, respectively located at the left and right ends of the main valve reversing valve core assembly 203; the pilot valve 1 is connected to the valve cover 205 by screws.

[0030] Preferably, Figure 3As shown, the main valve reversing valve core assembly 203 mainly includes: a shaft 2031, a locking nut 2032, a locking gasket 2033, a copper gasket 2034, an end face sealing ring 2035, a positioning valve core 2036 and a valve core sealing gasket 2037. Among them, the locking gasket 2033, the copper gasket 2034, the end face sealing ring 2035 and the positioning valve core 2036 are all sleeved on the shaft 2061; the two end face sealing rings 2035 are respectively arranged at the left and right ends of the positioning valve core 2036, and are locked by the locking nut 2062; the locking gasket 2033 and the copper gasket 2034 are arranged between the locking nut 2062 and the end face sealing ring 2035; the valve core sealing gasket 2037 is a special shape, and is bonded to the annular groove of the end face sealing ring 2035 by a vulcanization process. Furthermore, the anti-loosening gasket 2033, the copper gasket 2034, the end face sealing ring 2035, the positioning valve core 2036 and the shaft 2031 are matched with each other in clearance. The slight clearance between the end face sealing ring 2035 and the positioning valve core 2036 may cause leakage of the working medium. A sealing structure is designed between the end face sealing ring 2035 and the positioning valve core 2036, which adopts a rectangular plus circular arc structure and is made of hydrogenated nitrile rubber. The shaft 2031 is designed to be hollow to ensure that the spring cavity of the left main valve reset spring is connected to the left cavity of the reversing piston and finally connected to the outside atmosphere.

[0031] In this embodiment, if Figure 6As shown, the pilot valve 1 mainly includes: a pilot valve body 101, a manual switch 102, an O-ring 103, an electromagnetic coil 104, a static valve core assembly 105, a locking nut 106, a moving valve core assembly 107, a pilot valve return spring 108 and an air inlet valve nozzle 109. Among them, the electromagnetic coil 104 is located at the upper part of the pilot valve body 101, and an opening is provided at the top; the static valve core assembly 105 is screwed into the pilot valve body 101 through the lower end thread, and together with the pilot valve body 101, forms a pilot valve cavity; the O-ring 103 is installed in the annular groove at the end of the lower end thread of the static valve core assembly 105, and contacts with the side wall of the inner hole of the pilot valve body 101 to achieve sealing, so as to prevent the gas in the pilot valve cavity from leaking out; the top of the static valve core assembly 105 extends from the opening at the top of the electromagnetic coil 104 to the electromagnetic coil 104. The outside of the coil 104; the part of the static valve core assembly 105 extending outside the electromagnetic coil 104 is a threaded structure, which is used to connect the anti-loosening nut 106, and the electromagnetic coil 104 and the pilot valve body 101 are pressed by tightening the anti-loosening nut 106; the bottom end of the static valve core assembly 105 is provided with a cylindrical through hole with an opening at the lower end, and the dynamic valve core assembly 107 is installed in the cylindrical through hole; the lower end of the dynamic valve core assembly 107 is a conical structure, and the pilot valve reset spring 108 is a conical spring; one end of the pilot valve reset spring 108 is sleeved on the dynamic valve core assembly 107. The conical structure at the lower end of the valve core assembly 107 is limited by the conical structure at the lower end of the moving valve core assembly 107 to ensure that the pilot valve return spring 108 will not fall off during the movement of the moving valve core assembly 107; the other end of the pilot valve return spring 108 contacts the static valve core assembly 105, and the pilot valve return spring 108 is pre-tightened and compressed by the static valve core assembly 105; the pilot valve return spring 108 applies spring force to the moving valve core assembly 107, so that the bottom end of the moving valve core assembly 107 contacts the inlet valve nozzle 109 , against the control gas inlet A1011 set at the bottom of the pilot valve body 101; a cylindrical step hole is set in the center of the inner cavity of the pilot valve body 101, for installing the air inlet valve nozzle 109, the air inlet valve nozzle 109 and the pilot valve body 101 have an interference fit, and the fitting surface is coated with sealant to prevent gas leakage; the manual switch 102 is installed in the pilot valve body 101 through the cylindrical hole on the right side of the pilot valve body 101, and the manual switch 102 is clamped by the lower end ring of the static valve core assembly 105 to prevent it from falling out.

[0032] In this embodiment, if Figure 8 As shown, the main valve seat 201 is provided with a connection port I2011, a connection port M2012, a discharge port N2013, a connection port O2014, a connection port P2015 and a connection port Q2016. Figure 5 As shown, the main valve body 202 is provided with a connection port G2021, a connection port H2022, a connection port J2023, a connection port K2024 and a connection port L2025. Figure 4As shown, the valve cover 205 is provided with a connection port II2051, a connection port E2052 and a connection port F2053. A control gas inlet A1011 and a control gas outlet B1012 are provided at the bottom of the pilot valve body 101; a discharge port C1051 connected to the outside is provided at the middle of the top of the static valve core assembly 105. Among them, one end of the stainless steel pipe 3 is connected to the connection port I2011 through a straight-through ferrule, and the other end is connected to the connection port II2051 through a straight-through ferrule to introduce the gas of the air inlet 4 into the valve cover inner cavity 2054; the control gas inlet A1011 and the control gas outlet B1012 are both connected to the pilot valve cavity; the upper side of the connection port E2052 is connected to the control gas inlet A1011, and the lower side is connected to the valve cover inner cavity 2054; the upper side of the connection port F2053 is connected to the control gas outlet B1012 The lower side is connected with the connection port G2021; so that the control gas enters the piston chamber on the right side of the reversing piston 204 to achieve the purpose of reversing; the connection port H2022 is connected with the connection port M2012 and the exhaust port N2013, and finally realizes connection with the outside atmosphere; the connection port J2023 is connected with the connection port O2014 and the air inlet 4; the connection port K2024 is connected with the connection port P2015 and the air outlet 6; the connection port L2025 is connected with the connection port Q2016 and the discharge port 5.

[0033] In this embodiment, if Figure 7 As shown, the moving valve core assembly 107 mainly includes: a moving valve core 1071, a buffer spring 1072, an exhaust port sealing gasket 1073 and an air inlet sealing gasket 1074. Among them, the moving valve core 1071 has a special-shaped cavity at the upper end, a through hole 10712 at the side, and a dovetail groove at the lower end; the air inlet sealing gasket 1074 is pasted in the dovetail groove of the moving valve core 1071 through a vulcanization process; the buffer spring 1072 is located in the cavity inside the moving valve core 1071 and is placed at the lower part of the exhaust port sealing gasket 1073; the exhaust port sealing gasket 1073 is pressed into the special-shaped cavity inside the moving valve core 1071, one end compresses the buffer spring 1072, and the other end is close to the upper end boss to prevent the exhaust port sealing gasket 1073 from slipping off.

[0034] Furthermore, a plurality of guide grooves 10711 are provided on the cylindrical surface of the moving valve core 1071, which are used to connect the control gas outlet B1012 and the exhaust port C1051. The inlet seal 1074 is used to contact the cutting edge of the inlet valve nozzle 109 to form a seal when the large flow pilot solenoid valve is in the "closed" state; the exhaust seal 1073 is used to contact the cutting edge of the static valve core assembly 105 to form a seal when the large flow pilot solenoid valve is in the "open" state. The buffer spring 1072 is used to compress and displace the exhaust seal 1073 when the external force is greater than the set sealing spring force, so as to achieve buffering and prevent the exhaust seal 1073 from being subjected to excessive stress, thereby avoiding damage to the exhaust seal 1073. The exhaust seal 1073 and the buffer spring 1072 are pressed together through the upper port of the moving valve core 1071, which effectively prevents the exhaust seal 1073 from coming out during movement. The air inlet sealing gasket 1074 is formed by vulcanization hot pressing process, so as to ensure that it will not fall off during the axial movement of the moving valve core 1071 and the sealing performance is stable.

[0035] In this embodiment, when the electromagnetic coil 104 fails or there is no power supply: if the solenoid valve needs to be opened, the manual switch 102 is manually turned 180° clockwise to open the solenoid valve, so that the control gas inlet A1011 and the control gas outlet B1012 are connected; if the solenoid valve needs to be closed, the manual switch 102 is manually turned 180° counterclockwise to close the solenoid valve, so that the control gas inlet A1011 is cut off and the control gas outlet B1012 and the exhaust port C1051 are connected.

[0036] In this embodiment, the working process of the large flow pilot solenoid valve is as follows:

[0037] No power state:

[0038] When the large flow pilot solenoid valve is not powered, the pilot valve reset spring on the pilot valve moving valve core provides sealing force, so that the air inlet sealing gasket contacts with the air inlet valve nozzle to achieve sealing, and the control gas inlet A at the bottom of the pilot valve body is sealed. A guide groove is opened on the cylindrical surface of the moving valve core to connect the control gas outlet B and the discharge port C. The cavity on the right side of the main valve reversing piston is connected to the atmosphere through the control gas outlet B and the discharge port C. The main valve reset spring of the main valve provides sealing force, so that the sealing gasket of the main valve reversing valve core contacts with the cutting edge on the left side of the main valve body to achieve sealing. At this time, the air inlet of the main valve is cut off, and the air outlet and the discharge port are connected.

[0039] Power-on process:

[0040] When the large flow pilot solenoid valve is powered on, the moving valve core assembly of the pilot valve opens under the action of electromagnetic force, so that the exhaust port seal gasket contacts the cutting edge of the static valve core assembly to achieve sealing, the exhaust port C is sealed, and the control gas inlet A and the control gas outlet B are connected. At this time, the control gas reaches the control gas outlet B through the control gas inlet A, and then enters the right cavity of the main valve reversing piston. When the pressure reaches the set pressure, the reversing piston overcomes the spring force of the main valve return spring, pushes the main valve reversing valve core to move to the left, and finally makes the main valve reversing valve core seal gasket contact the right edge of the main valve body to achieve sealing. At this time, the air inlet is connected to the air outlet, and the discharge port is cut off.

[0041] Power off shutdown process:

[0042] When the large flow pilot solenoid valve is powered off, the pilot valve reset spring pushes the pilot valve moving valve core assembly to close, so that the air inlet seal contacts the air inlet valve nozzle to achieve sealing, the control gas inlet A is sealed, and the control gas outlet B is connected to the discharge port C. The compressed air in the right chamber of the main valve reversing piston is connected to the atmosphere through the control gas outlet B and the discharge port C for discharge. When the pressure in the right chamber of the main valve reversing piston is lower than the set pressure, the main valve reset spring pushes the main valve reversing valve core assembly to move to the right, and finally makes the main valve reversing valve core seal contact the blade on the left side of the main valve body to achieve sealing. At this time, the air inlet is cut off, and the air outlet is connected to the discharge port.

[0043] It should be noted that the above is only one embodiment of the technical solution of the present invention. In this embodiment, the main valve structure is a two-position three-way structure. In actual applications, the number and position settings of the inlet and outlet of the main valve can be changed as needed based on the same principle.

[0044] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

[0045] The contents not described in detail in the specification of the present invention belong to the common knowledge of professionals in the field.

Claims

1. A large flow pilot solenoid valve, characterized in that: include: A pilot valve (1), a main valve (2) and a stainless steel pipe (3); wherein the main valve (2) is provided with an air inlet (4), a discharge port (5) and an air outlet (6); the solenoid valve control gas is shared with the main valve air supply, and the gas at the air inlet (4) is introduced into the pilot valve (1) through the stainless steel pipe (3).

2. The large flow pilot solenoid valve according to claim 1, characterized in that: A main valve (2) comprises: a main valve seat (201), a main valve body (202), a main valve reversing valve core assembly (203), a reversing piston (204), a valve cover (205), a main valve reset spring (206), an end cover (207) and an annular seal (209); wherein the main valve body (202) is mounted on the main valve seat (201) and is encapsulated by the valve cover (205) and the end cover (207); the main valve reversing valve core assembly (203) is mounted in the inner cavity of the main valve body (202) through the annular seal (209); the main valve reset spring (206) and the reversing piston (204) are arranged in the inner cavity of the main valve body (202), and are respectively located at the left and right ends of the main valve reversing valve core assembly (203); and the pilot valve (1) is connected to the valve cover (205) by screws.

3. The large flow pilot solenoid valve according to claim 2, characterized in that: The main valve reversing valve core assembly (203) comprises: a shaft (2031), a locking nut (2032), an anti-loosening gasket (2033), a copper gasket (2034), an end face sealing ring (2035), a positioning valve core (2036) and a valve core sealing gasket (2037); wherein the anti-loosening gasket (2033), the copper gasket (2034), the end face sealing ring (2035) and the positioning valve core (2036) are all sleeved on the shaft (20 61); two end face sealing rings (2035) are respectively arranged at the left and right ends of the positioning valve core (2036) and are locked by a locking nut (2062); an anti-loosening gasket (2033) and a copper gasket (2034) are arranged between the locking nut (2062) and the end face sealing ring (2035); the valve core sealing gasket (2037) is of a special shape and is bonded to the annular groove of the end face sealing ring (2035) by a vulcanization process.

4. The large flow pilot solenoid valve according to claim 2, characterized in that: A pilot valve (1) comprises: a pilot valve body (101), a manual switch (102), an O-ring (103), an electromagnetic coil (104), a static valve core assembly (105), a locking nut (106), a movable valve core assembly (107), a pilot valve return spring (108) and an air inlet valve nozzle (109); wherein the electromagnetic coil (104) is located at the upper part of the pilot valve body (101) and has an opening at the top; the static valve core assembly (105) is screwed into the pilot valve body (101) through a thread at the lower end and forms a pilot valve cavity together with the pilot valve body (101); the O-ring (103) is installed on the static valve core assembly (105) and the movable valve core assembly (107) is installed on the static valve core assembly (108). The valve core assembly (105) is in the annular groove at the end of the thread at the lower end, and contacts the side wall of the inner hole of the pilot valve body (101) to achieve sealing, thereby preventing the gas in the pilot valve cavity from leaking out; the top of the static valve core assembly (105) extends from the opening at the top of the electromagnetic coil (104) to the outside of the electromagnetic coil (104); the part of the static valve core assembly (105) extending outside the electromagnetic coil (104) is a threaded structure, which is used to connect the anti-loosening nut (106), and the electromagnetic coil (104) and the pilot valve body (101) are pressed together by tightening the anti-loosening nut (106); the bottom of the static valve core assembly (105) is provided with a cylindrical through hole with a lower end opening, and the moving valve The core assembly (107) is installed in the cylindrical through hole; the lower end of the moving valve core assembly (107) is a conical structure, and the pilot valve return spring (108) is a conical spring; one end of the pilot valve return spring (108) is sleeved on the conical structure at the lower end of the moving valve core assembly (107), and is limited by the conical structure at the lower end of the moving valve core assembly (107); the other end of the pilot valve return spring (108) is in contact with the static valve core assembly (105), and the pilot valve return spring (108) is pre-tightened and compressed by the static valve core assembly (105); the pilot valve return spring (108) applies spring force to the moving valve core assembly (107), so that the moving valve core assembly (107) The bottom end of the pilot valve body (107) contacts the air inlet valve nozzle (109) and abuts against the control gas inlet A (1011) provided at the bottom of the pilot valve body (101); a cylindrical step hole is provided in the center of the inner cavity of the pilot valve body (101) for installing the air inlet valve nozzle (109); the air inlet valve nozzle (109) and the pilot valve body (101) are interference fit, and the fitting surfaces are coated with sealant to prevent gas leakage; the manual switch (102) is installed into the pilot valve body (101) through the cylindrical hole on the right side of the pilot valve body (101), and the manual switch (102) is clamped by the lower end ring of the static valve core assembly (105) to prevent it from falling out.

5. The large flow pilot solenoid valve according to claim 4, characterized in that: The main valve seat (201) is provided with a connection port I (2011), a connection port M (2012), a discharge port N (2013), a connection port O (2014), a connection port P (2015) and a connection port Q (2016); the main valve body (202) is provided with a connection port G (2021), a connection port H (2022), a connection port J (2023), a connection port K (2024) and a connection port L (2025); the valve cover (205) is provided with a connection port II (2051), a connection port E (2052) and a connection port F (2053); a control gas inlet A (1011) and a control gas outlet B (1012) are provided at the bottom of the pilot valve body (101); a discharge port C (1051) communicating with the outside is provided at the middle of the top of the static valve core assembly (105); wherein one end of the stainless steel pipe (3) is connected to the connection port I (2011) through a straight-through ferrule, and the other end is connected to the connection port II (2051) through a straight-through ferrule, so as to pass the inlet The gas from the gas port (4) is introduced into the inner cavity (2054) of the valve cover; the control gas inlet A (1011) and the control gas outlet B (1012) are both connected to the valve cavity of the pilot valve; the upper side of the connecting port E (2052) is connected to the control gas inlet A (1011), and the lower side is connected to the inner cavity (2054) of the valve cover; the upper side of the connecting port F (2053) is connected to the control gas outlet B (1012), and the lower side is connected to the connecting port G (2021); thereby allowing the control gas to enter the exchange Toward the piston chamber on the right side of the piston (204), the purpose of reversing is achieved; the connection port H (2022) is connected with the connection port M (2012) and the discharge port N (2013), and finally realizes connection with the outside atmosphere; the connection port J (2023) is connected with the connection port O (2014) and the air inlet (4); the connection port K (2024) is connected with the connection port P (2015) and the air outlet (6); the connection port L (2025) is connected with the connection port Q (2016) and the discharge port (5).

6. The large flow pilot solenoid valve according to claim 4, characterized in that: A movable valve core assembly (107) comprises: a movable valve core (1071), a buffer spring (1072), an exhaust port sealing gasket (1073) and an air inlet sealing gasket (1074); wherein the movable valve core (1071) is provided with a special-shaped cavity at the upper end, a through hole (10712) is provided at the side, and a dovetail groove is provided at the lower end; the air inlet sealing gasket (1074) is adhered to the dovetail groove of the movable valve core (1071) through a vulcanization process; the buffer spring (1072) is located in the cavity inside the movable valve core (1071) and is placed under the exhaust port sealing gasket (1073); the exhaust port sealing gasket (1073) is press-fitted into the special-shaped cavity inside the movable valve core (1071), one end of which compresses the buffer spring (1072) and the other end of which is tightly attached to the upper end boss to prevent the exhaust port sealing gasket (1073) from slipping off.

7. The large flow pilot solenoid valve according to claim 6, characterized in that: The air inlet sealing gasket (1074) is used to contact the cutting edge of the air inlet valve nozzle (109) to form a seal when the large flow pilot solenoid valve is in the "closed" state; the exhaust port sealing gasket (1073) is used to contact the cutting edge of the static valve core assembly (105) to form a seal when the large flow pilot solenoid valve is in the "open" state.

8. The large flow pilot solenoid valve according to claim 6, characterized in that: The buffer spring (1072) is used to compress and generate displacement when the external force applied to the exhaust port sealing gasket (1073) is greater than the set sealing spring force, thereby achieving buffering and preventing the exhaust port sealing gasket (1073) from being subjected to excessive stress, thereby avoiding damage to the exhaust port sealing gasket (1073).

9. The large flow pilot solenoid valve according to claim 6, characterized in that: A plurality of guide grooves (10711) are provided on the cylindrical surface of the movable valve core (1071) for connecting the control gas outlet B (1012) and the exhaust port C (1051).

10. The large flow pilot solenoid valve according to claim 5, characterized in that: When the electromagnetic coil (104) fails or there is no power supply: if the electromagnetic valve needs to be opened, the manual switch (102) is manually turned 180° clockwise to open the electromagnetic valve, so that the control gas inlet A (1011) and the control gas outlet B (1012) are connected; if the electromagnetic valve needs to be closed, the manual switch (102) is manually turned 180° counterclockwise to close the electromagnetic valve, so that the control gas inlet A (1011) is cut off and the control gas outlet B (1012) and the exhaust port C (1051) are connected.

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