Zero-pollution miniature high-pressure valve terminal electromagnetic valve

Abstract

The invention relates to the technical field of aerospace, in particular to a zero-pollution miniature high-pressure valve terminal electromagnetic valve. The zero-pollution miniature high-pressure valve terminal electromagnetic valve comprises a valve body, a valve seat, a valve element, a rubber composite membrane, a spring and a coil assembly, compared with a traditional electromagnetic valve, the situation that fluid is polluted by redundant substances generated due to the fact that the valve element rubs the inner wall of a flow channel is greatly reduced, meanwhile, high-pressure fluid impact which cannot be borne by a common membrane electromagnetic valve can be borne, and the service life of the electromagnetic valve is prolonged. The electromagnetic valve is simple and reliable in structure, compared with a complex structure of a traditional electromagnetic valve, faults are not prone to being generated, the electromagnetic valve is applied to a valve terminal in a spaceflight satellite chemical propulsion system, and the operation time of a spaceflight satellite is greatly prolonged.

Description

Technical Field

[0001] The present disclosure relates to the field of aerospace technology, and in particular to a zero-pollution micro high-pressure valve island solenoid valve. Background Art

[0002] Solenoid valves are important control components in aerospace satellite control systems. They mainly control the on and off of fuel, oxidant or other fluid media. They play a vital role in aerospace satellite control and directly affect the power supply of spacecraft. Especially in the fields of aviation and aerospace, solenoid valves have extremely high requirements for the cleanliness of the medium due to the thermal vacuum and high-pressure working environment and the strong corrosiveness of the medium. At present, most fluid solenoid valve structures adopt a tubular structure, that is, the fluid medium flows from the solenoid valve inlet through the valve core and out of the solenoid valve outlet. The valve core is connected to the valve cavity through a spring set in the direction of fluid flow. When the solenoid valve is working, the valve core is the key moving part. The traditional solenoid valve valve core, spring and the inner wall of the valve cavity often rub against each other. Under long-term operation, the friction will not only produce excess matter to contaminate the medium, but also increase the movement resistance of the valve core, thereby greatly shortening the working life of the solenoid valve, affecting the cleanliness of the medium, and thus affecting the operation time of the aerospace satellite. Summary of the invention

[0003] In order to solve the problems in the related art, an embodiment of the present disclosure provides a zero-pollution micro high-pressure valve island solenoid valve.

[0004] In a first aspect, an embodiment of the present disclosure provides a zero-pollution micro high-pressure valve island solenoid valve. According to an embodiment of the present disclosure, the zero-pollution micro high-pressure valve island solenoid valve includes:

[0005] A valve body, the valve body comprising a first section, a second section and a third section adjacent to each other in sequence, the valve body being a hollow structure, the first end of the first section being a closed end, the hollow structure comprising a first section and a second section arranged in sequence from the first section to the third section, the first section being provided with a spring and a valve core, the second section being provided with a rubber composite diaphragm and a valve seat, the inner diameter of the first section being smaller than the inner diameter of the second section, so that a step structure is formed at the junction of the first section and the second section;

[0006] A valve seat, wherein the valve seat has an inlet pipe arranged along the axis of the valve seat and an outlet pipe arranged parallel to the axis, the inlet pipe and the outlet pipe both pass through the valve seat, the first end of the valve seat faces the outside of the valve body, the second end of the valve seat is tightly attached to the rubber composite diaphragm separating the valve core and the valve seat, the first outlet pipe and the second outlet pipe have a recessed structure at the inlet of the second end, and the outer wall of the valve seat is fixed to the inner wall of the second section by a threaded structure;

[0007] A valve core, wherein a first end of the valve core is connected to a spring, and a second end of the valve core is opposite to the rubber composite diaphragm;

[0008] A rubber composite diaphragm, wherein the rubber composite diaphragm comprises a five-layer structure, wherein the first and fifth layers are made of rubber material, the second and fourth layers are mesh braids, and the third layer is a spring steel strip, and the rubber composite diaphragm is clamped and fixed by the valve seat and the step structure;

[0009] A spring, wherein the spring is arranged between the valve body and the valve core to provide an elastic force along the axial direction of the hollow structure;

[0010] A coil assembly, wherein the coil assembly is sleeved on the first section, the second section, and the third section of the valve body, wherein the first section, the third section, and the valve core are all made of magnetic conductive materials, and the second section is made of non-magnetic conductive material, and is used to block the magnetic lines of force between the first section and the third section;

[0011] Wherein, under the combined action of the electromagnetic force generated by the coil assembly and the spring, the solenoid valve is in an open or closed state. In the open state, the second end of the valve core leaves the rubber composite diaphragm, and the rubber composite diaphragm is deformed under the action of the fluid in the inlet pipe to connect the inlet pipe with the first outlet pipe and the second outlet pipe. In the closed state, the second end of the valve core is pressed against the rubber composite diaphragm, and the rubber composite diaphragm is pressed against the inlet pipe opening to close the inlet pipe.

[0012] According to an embodiment of the present disclosure, the material of the first and third sections of the valve body is 1J36 soft magnetic alloy, and the material of the second section is 1Cr18Ni9Ti stainless steel. The first, second and third sections of the valve body are connected by vacuum electron beam welding.

[0013] According to an embodiment of the present disclosure, the rubber composite diaphragm is formed by hot pressing, and is tempered at a medium temperature of 350-500° C. to obtain the required yield strength, elastic limit and toughness, and then a vacuum annealing process is used to stabilize the elasticity.

[0014] According to an embodiment of the present disclosure, the spring steel strip in the rubber composite diaphragm includes a plurality of pores punched through the steel strip layer before hot pressing.

[0015] According to an embodiment of the present disclosure, the material of the mesh braid in the rubber composite diaphragm is polyester.

[0016] According to an embodiment of the present disclosure, the stiffness difference between the two surfaces of the rubber composite diaphragm is no more than 1N.

[0017] According to an embodiment of the present disclosure, the thickness of the rubber composite diaphragm is 1.5-2.5 mm.

[0018] According to an embodiment of the present disclosure, the thickness of the rubber composite diaphragm is 1.5 mm, 2 mm or 2.5 mm.

[0019] According to an embodiment of the present disclosure, a valve shell is disposed outside the valve body, and the valve shell is cylindrical and is disposed outside the first section, the second end and the third section of the valve body.

[0020] According to an embodiment of the present disclosure, an annular adjustment gasket made of 1Cr18Ni9Ti stainless steel is provided between the spring and the valve core to adjust the elastic force between the valve core and the spring.

[0021] According to an embodiment of the present disclosure, there are one or more annular adjustment gaskets.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] The disclosed embodiment is applied to the valve island in the electric propulsion system of the aerospace satellite to control the satellite orbit control, orbit change and attitude adjustment. The disclosed embodiment adopts a rubber composite diaphragm with a special structure to physically isolate the medium from the valve core. The inlet and outlet of the solenoid valve are arranged on the valve seat at the same time. The medium does not need to flow through the valve core. The excess material generated by the friction between the valve core and the inner wall of the valve cavity is isolated by the rubber composite diaphragm, thereby effectively avoiding the problem of the excess material generated by the friction between the valve core and the inner wall of the valve cavity contaminating the medium during the operation of the solenoid valve. It can work reliably for a long time under thermal vacuum environment conditions, greatly improving the service life of the solenoid valve, and thus improving the operation time of the aerospace satellite.

[0024] Furthermore, according to the embodiments of the present disclosure, in order to withstand the impact of high-pressure fluid, the embodiments of the present disclosure adopt a structure combining soft magnetic alloy and stainless steel, and use a rubber composite diaphragm formed by hot pressing, medium-temperature tempering process and vacuum annealing process, combined with accurate control of the difference in stiffness on both sides of the rubber composite diaphragm to make the elastic force of the rubber composite diaphragm symmetrical, so that the rubber composite diaphragm can move accurately and quickly, and the rubber composite diaphragm can withstand an overall pressure resistance of 3Mpa, achieving the effect of allowing the solenoid valve to open and close more quickly and withstand high-pressure fluid. The embodiments of the present disclosure can achieve the use index of opening and closing response time ≤5ms under DC24V load 40MPa. Traditional diaphragm solenoid valves withstand pressures below 15MPa, while the embodiments of the present disclosure withstand pressures of 40MPa, and can work stably for a long time in a space environment, and the service life of the switch is about more than 300,000 times.

[0025] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Other features, objectives and advantages of the present disclosure will become more apparent through the following detailed description of non-limiting embodiments in conjunction with the accompanying drawings. In the accompanying drawings:

[0027] Figure 1 An overall cross-sectional view of a solenoid valve according to an embodiment of the present disclosure is shown.

[0028] Figure 2 A schematic diagram of a rubber composite diaphragm in a solenoid valve according to an embodiment of the present disclosure is shown.

[0029] Figure 3 A schematic diagram showing the spring steel band pores of the rubber composite diaphragm in the solenoid valve according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0030] Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement them. In addition, for the sake of clarity, parts not related to the description of the exemplary embodiments are omitted in the accompanying drawings.

[0031] In the present disclosure, it should be understood that terms such as "include" or "have" are intended to indicate the presence of features, numbers, steps, behaviors, components, parts, or a combination thereof disclosed in the present specification, and are not intended to exclude the possibility that one or more other features, numbers, steps, behaviors, components, parts, or a combination thereof exist or are added.

[0032] It should also be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other. The present disclosure will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0033] As mentioned above, at present, most solenoid valve structures adopt a tubular structure, that is, the fluid medium flows from the solenoid valve inlet through the valve core and out of the solenoid valve outlet, and the valve core is connected to the valve cavity through a spring set in the direction of fluid flow. When the solenoid valve is working, the valve core is the key moving component. The valve core, spring and inner wall of the valve cavity of the traditional solenoid valve often produce friction with each other. Under long-term operation, the friction will produce excess materials to contaminate the fluid medium, thereby greatly affecting the working life of the solenoid valve. At the same time, the traditional diaphragm solenoid valve cannot withstand the impact of high-pressure fluid media due to insufficient diaphragm pressure, and the structure is complex, the working life is short, and the corrosion resistance of the components is weak. If it is used in aerospace satellite power systems, it will seriously affect the safe operation of aerospace satellites and cannot meet the needs of long-term reliable operation under thermal vacuum environment conditions in aerospace satellite chemical propulsion systems.

[0034] In order to solve the above technical problems, the present invention discloses a zero-pollution micro high-pressure valve island solenoid valve, comprising:

[0035] A valve body, the valve body comprising a first section, a second section and a third section adjacent to each other in sequence, the valve body being a hollow structure, the first end of the first section being a closed end, the hollow structure comprising a first section and a second section arranged in sequence from the first section to the third section, the first section being provided with a spring and a valve core, the second section being provided with a rubber composite diaphragm and a valve seat, the inner diameter of the first section being smaller than the inner diameter of the second section, so that a step structure is formed at the junction of the first section and the second section; a valve seat, the valve seat having a An inlet pipe arranged on the axis and an outlet pipe arranged parallel to the axis, the inlet pipe and the outlet pipe both pass through the valve seat, the first end of the valve seat faces the outside of the valve body, the second end of the valve seat is tightly attached to the rubber composite diaphragm separating the valve core and the valve seat, the first outlet pipe and the second outlet pipe have a recessed structure at the inlet of the second end, and the outer wall of the valve seat is fixed to the inner wall of the second section by a threaded structure; a valve core, the first end of the valve core is connected to a spring, the second end of the valve core is opposite to the rubber composite diaphragm; the rubber composite diaphragm, the rubber The composite diaphragm comprises a five-layer structure, wherein the first and fifth layers are made of rubber, the second and fourth layers are mesh braids, and the third layer is a spring steel strip, and the rubber composite diaphragm is clamped and fixed by the valve seat and the step structure; a spring, wherein the spring is arranged between the valve body and the valve core to provide elastic force along the axial direction of the hollow structure; a coil assembly, wherein the coil assembly is sleeved on the first section, the second section, and the third section of the valve body, wherein the first section, the third section, and the valve core are all made of magnetic conductive materials, and the second section is made of non-magnetic conductive materials, and is used to block the magnetic lines of force between the first section and the third section; wherein, under the combined action of the electromagnetic force generated by the coil assembly and the spring, the solenoid valve is in an open or closed state, wherein in the open state, the second end of the valve core leaves the rubber composite diaphragm, and the rubber composite diaphragm is deformed under the action of the fluid in the inlet pipe to connect the inlet pipe with the first outlet pipe and the second outlet pipe, and in the closed state, the second end of the valve core is pressed against the rubber composite diaphragm, and the rubber composite diaphragm is pressed against the inlet pipe opening to close the inlet pipe.

[0036] The disclosed embodiment uses a rubber composite diaphragm with a special structure to physically isolate the medium from the valve core. The inlet and outlet of the solenoid valve are simultaneously arranged on the valve seat. The medium does not need to flow through the valve core, and the excess material generated by the friction between the valve core and the inner wall of the valve cavity is isolated by the rubber composite diaphragm, thereby effectively avoiding the problem of the medium being contaminated by the excess material generated by the friction between the valve core and the inner wall of the valve cavity during the operation of the solenoid valve. The solenoid valve can work reliably for a long time under thermal vacuum environment conditions, greatly improving the service life of the solenoid valve, and thereby improving the operation time of the space satellite.

[0037] Reference below Figure 1-Figure 3A zero-pollution micro high-pressure valve island solenoid valve according to an embodiment of the present disclosure is specifically described.

[0038] like Figure 1 , Figure 2 and Figure 3 As shown, the zero-pollution micro high-pressure valve island solenoid valve according to an embodiment of the present disclosure includes:

[0039] A valve body, the valve body comprising a first section, a second section and a third section adjacent to each other in sequence, the valve body being a hollow structure, the first end of the first section being a closed end, the hollow structure comprising a first section and a second section arranged in sequence from the first section to the third section, the first section being provided with a spring and a valve core, the second section being provided with a rubber composite diaphragm and a valve seat, the inner diameter of the first section being smaller than the inner diameter of the second section, so that a step structure is formed at the junction of the first section and the second section; a valve seat, the valve seat having a An inlet pipe arranged on the axis and an outlet pipe arranged parallel to the axis, the inlet pipe and the outlet pipe both pass through the valve seat, the first end of the valve seat faces the outside of the valve body, the second end of the valve seat is tightly attached to the rubber composite diaphragm separating the valve core and the valve seat, the first outlet pipe and the second outlet pipe have a recessed structure at the inlet of the second end, and the outer wall of the valve seat is fixed to the inner wall of the second section by a threaded structure; a valve core, the first end of the valve core is connected to a spring, the second end of the valve core is opposite to the rubber composite diaphragm; the rubber composite diaphragm, the rubber The composite diaphragm comprises a five-layer structure, wherein the first and fifth layers are made of rubber, the second and fourth layers are mesh braids, and the third layer is a spring steel strip, and the rubber composite diaphragm is clamped and fixed by the valve seat and the step structure; a spring, wherein the spring is arranged between the valve body and the valve core to provide elastic force along the axial direction of the hollow structure; a coil assembly, wherein the coil assembly is sleeved on the first section, the second section, and the third section of the valve body, wherein the first section, the third section, and the valve core are all made of magnetic conductive materials, and the second section is made of non-magnetic conductive materials, and is used to block the magnetic lines of force between the first section and the third section; wherein, under the combined action of the electromagnetic force generated by the coil assembly and the spring, the solenoid valve is in an open or closed state, wherein in the open state, the second end of the valve core leaves the rubber composite diaphragm, and the rubber composite diaphragm is deformed under the action of the fluid in the inlet pipe to connect the inlet pipe with the first outlet pipe and the second outlet pipe, and in the closed state, the second end of the valve core is pressed against the rubber composite diaphragm, and the rubber composite diaphragm is pressed against the inlet pipe opening to close the inlet pipe.

[0040] According to an embodiment of the present disclosure, the material of the first section and the third section of the valve body is a magnetic conductive material, for example, it can be 1J36 soft magnetic alloy; the material of the second section of the valve body is a non-magnetic conductive material, for example, it can be 1Cr18Ni9Ti stainless steel. The coil assembly is sleeved on the first section, the second section, and the third section of the valve body, the first section, the third section, and the valve core are all made of magnetic conductive materials, and the second section is a non-magnetic conductive material, thereby blocking the magnetic lines of force between the first section and the third section. The material of the solenoid valve core is a magnetic conductive material, for example, it can be 1J36 soft magnetic alloy. Since the second section of the valve body blocks the magnetic lines of force between the first section and the third section, the magnetic lines of force generated by the coil assembly pass through the first section, the guide part, and the third section, so that the movement of the valve core can be controlled by turning the coil assembly on and off to realize the switching of the solenoid valve.

[0041] Specifically, when the coil assembly is powered on, the first section, the third section and the valve core of the valve body made of 1J36 soft magnetic alloy will be magnetized, and the second section of the valve body is 1Cr18Ni9Ti stainless steel, which blocks the magnetic force lines between the first section and the third section due to its antimagnetism, so that the magnetic force lines pass through the valve core, forming a magnetic field path in the first section, the valve core and the third section, generating magnetic force to attract the valve core to move toward the first section, the valve core leaves the rubber composite diaphragm, the spring contracts, the rubber composite diaphragm leaves the inlet pipe under the pressure of the fluid medium, and the solenoid valve opens. When the coil assembly is powered off, the magnetic attraction to the valve core disappears, the elastic force of the spring presses the valve core toward the rubber composite diaphragm, the rubber composite diaphragm blocks the inlet pipe, and the solenoid valve is closed.

[0042] During the movement of the valve core, since the valve core and the fluid are separated by the rubber composite diaphragm, the pollutants generated by the friction between the valve core and the inner wall of the valve cavity are effectively prevented from contacting with the fluid and contaminating the fluid.

[0043] According to an embodiment of the present disclosure, the first section, the second section, and the third section of the valve body are joined by vacuum electron beam welding. Conventional solenoid valves fix the various modules of the valve body by arc welding or riveting, but weld deformation is prone to occur under thermal vacuum conditions, leading to leakage and residue contamination. Vacuum electron beam welding effectively reduces the possibility of weld deformation with its high-precision welding position, narrow heat-affected zone, and minimal weld deformation, making the valve body durable and increasing the service life of the valve body.

[0044] According to an embodiment of the present disclosure, the rubber composite diaphragm is formed by hot pressing, and is tempered at a medium temperature of 350-500° C. to obtain the required yield strength, elastic limit and toughness, and then a vacuum annealing process is used to stabilize the elasticity.

[0045] According to an embodiment of the present disclosure, the spring steel strip in the rubber composite diaphragm includes a plurality of pores punched through the steel strip layer before hot pressing.

[0046] According to an embodiment of the present disclosure, the material of the mesh braid in the rubber composite diaphragm is polyester.

[0047] According to an embodiment of the present disclosure, the stiffness difference between the two surfaces of the rubber composite diaphragm is no more than 1N.

[0048] According to an embodiment of the present disclosure, the thickness of the rubber composite diaphragm is 1.5-2.5 mm.

[0049] According to an embodiment of the present disclosure, the thickness of the rubber composite diaphragm is 1.5 mm, 2 mm or 2.5 mm.

[0050] According to an embodiment of the present disclosure, an annular adjustment gasket made of 1Cr18Ni9Ti stainless steel is provided between the spring and the valve core to adjust the elastic force between the valve core and the spring.

[0051] According to an embodiment of the present disclosure, there are one or more annular adjustment gaskets.

[0052] In the chemical propulsion system of aerospace satellites, the solenoid valve on the valve island is an important control component in the control system. It mainly controls the on and off of fuel, oxidant or other fluid media. It needs to work reliably for a long time under thermal vacuum environment conditions and needs to maintain the cleanliness of the fluid. It has extremely high requirements for its working life. For this reason, the present invention uses a rubber composite diaphragm with a special structure to separate the first section containing the valve core and the second section containing the valve seat in the valve cavity to prevent self-contamination generated by the solenoid valve from infiltrating the fluid.

[0053] In order to enhance the strength of the rubber composite diaphragm to prevent high-pressure fluid from damaging the rubber composite diaphragm, the embodiment of the present disclosure adopts a 5-layer rubber composite diaphragm, wherein the first and fifth layers of the rubber composite diaphragm are made of rubber material, the second and fourth layers are mesh braids made of polyester material, which are used to enhance the toughness of the rubber composite diaphragm, and the third layer is a spring steel belt, which contains a plurality of pores that penetrate the steel belt layer and are punched before hot pressing. The first and fifth layers of the rubber composite diaphragm are bonded to the mesh braid through the pores by hot pressing, thereby increasing the bonding force between the layers of the diaphragm.

[0054] The rubber composite diaphragm is formed by hot pressing, and its spring steel strip layer is tempered at a medium temperature of 350-500°C to obtain the required yield strength, elastic limit and toughness, and then a vacuum annealing process is used to stabilize the elasticity, so that the stiffness difference between the two sides of the rubber composite diaphragm is not more than 1N, so as to reduce the possibility of excessive deformation damaging the rubber composite diaphragm and meet the pressure-bearing and strength requirements of the rubber composite diaphragm. At the same time, in order to prevent the slight dimensional deformation caused by the processing of the valve body and valve seat and adjust the spring force according to the pressure of the high-pressure fluid, one or more annular adjustment gaskets made of 1Cr18Ni9Ti stainless steel are added between the spring and the valve core. In summary, the present invention optimizes the existing technology in multiple components such as the valve body, rubber composite diaphragm, spring gasket, etc., so as to adapt to the working environment with a higher air pressure of more than 40Mpa, and finally achieve the purpose of greatly extending the service life of the zero-pollution micro high-pressure valve island solenoid valve.

[0055] The above description is only a preferred embodiment of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present disclosure is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in the present disclosure (but not limited to) by each other.

Claims

1. A zero-pollution micro high-pressure valve island solenoid valve, characterized in that: The zero-pollution micro high-pressure valve island solenoid valve comprises: A valve body, the valve body comprising a first section, a second section and a third section adjacent to each other in sequence, the valve body being a hollow structure, the first end of the first section being a closed end, the hollow structure comprising a first section and a second section arranged in sequence from the first section to the third section, the first section being provided with a spring and a valve core, the second section being provided with a rubber composite diaphragm and a valve seat, the inner diameter of the first section being smaller than the inner diameter of the second section, so that a step structure is formed at the junction of the first section and the second section; A valve seat, wherein the valve seat has an inlet pipe arranged along the axis of the valve seat and an outlet pipe arranged parallel to the axis, the inlet pipe and the outlet pipe both pass through the valve seat, the first end of the valve seat faces the outside of the valve body, the second end of the valve seat is tightly attached to the rubber composite diaphragm separating the valve core and the valve seat, the first outlet pipe and the second outlet pipe have a recessed structure at the inlet of the second end, and the outer wall of the valve seat is fixed to the inner wall of the second section by a threaded structure; A valve core, wherein a first end of the valve core is connected to a spring, and a second end of the valve core is opposite to the rubber composite diaphragm; A rubber composite diaphragm, the rubber composite diaphragm comprises a five-layer structure, wherein the first and fifth layers are made of rubber material, the second and fourth layers are mesh braids, and the third layer is a spring steel strip, and the rubber composite diaphragm is clamped and fixed by the valve seat and the step structure; A spring, wherein the spring is arranged between the valve body and the valve core to provide an elastic force along the axial direction of the hollow structure; A coil assembly, wherein the coil assembly is sleeved on the first section, the second section, and the third section of the valve body, wherein the first section, the third section, and the valve core are all made of magnetic conductive materials, and the second section is made of non-magnetic conductive material, and is used to block the magnetic lines of force between the first section and the third section; Wherein, under the combined action of the electromagnetic force generated by the coil assembly and the spring, the solenoid valve is in an open or closed state. In the open state, the second end of the valve core leaves the rubber composite diaphragm, and the rubber composite diaphragm is deformed under the action of the fluid in the inlet pipe to connect the inlet pipe with the first outlet pipe and the second outlet pipe. In the closed state, the second end of the valve core is pressed against the rubber composite diaphragm, and the rubber composite diaphragm is pressed against the inlet pipe opening to close the inlet pipe.

2. The zero-pollution micro high-pressure valve island solenoid valve according to claim 1 is characterized in that: The first section and the third section of the valve body are made of 1J36 soft magnetic alloy, and the second section is made of 1Cr18Ni9Ti stainless steel. The first section, the second section and the third section of the valve body are joined by vacuum electron beam welding.

3. The zero-pollution micro high-pressure valve island solenoid valve according to claim 1 is characterized in that: The rubber composite diaphragm is formed by hot pressing, and is tempered at a medium temperature of 350-500° C. to obtain the required yield strength, elastic limit and toughness, and then a vacuum annealing process is used to stabilize the elasticity.

4. The zero-pollution micro high-pressure valve island solenoid valve according to claim 3 is characterized in that: The spring steel strip in the rubber composite diaphragm comprises a plurality of pores punched through the steel strip layer before hot pressing.

5. The zero-pollution micro high-pressure valve island solenoid valve according to claim 3 is characterized in that: The material of the mesh braid in the rubber composite diaphragm is polyester.

6. The zero-pollution micro high-pressure valve island solenoid valve according to claim 3 is characterized in that: The difference in stiffness between the two sides of the rubber composite diaphragm is no more than 1N.

7. The zero-pollution micro high-pressure valve island solenoid valve according to claim 3 is characterized in that: The thickness of the rubber composite diaphragm is 1.5-2.5 mm.

8. The zero-pollution micro high-pressure valve island solenoid valve according to claim 7 is characterized in that: The thickness of the rubber composite diaphragm is 1.5 mm, 2 mm or 2.5 mm.

9. The zero-pollution micro high-pressure valve island solenoid valve according to claim 1 is characterized in that: The valve body is provided with a valve shell outside. The valve shell is cylindrical and is sleeved on the outside of the first section, the second end and the third section of the valve body.

10. The zero-pollution micro high-pressure valve island solenoid valve according to claim 1, characterized in that: An annular adjustment gasket made of 1Cr18Ni9Ti stainless steel is provided between the spring and the valve core to adjust the elastic force between the valve core and the spring.

11. The zero-pollution micro high-pressure valve island solenoid valve according to claim 10, characterized in that: The number of the annular adjustment gasket is one or more.

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