High-temperature oxidant swelling resistant engine control valve and assembly method thereof

Abstract

The invention provides a high-temperature oxidizing agent swelling resistant engine control valve and an assembling method thereof. The high-temperature oxidizing agent swelling resistant engine control valve comprises a valve element assembly, a coil assembly, a shell assembly, a valve seat, a magnetism isolating gasket, a spring, a filter screen assembly, a housing and a throttling orifice plate. Working media enter the valve from the side face, fill the inner cavity of the valve and then flow out through a valve seat outlet. When the coil assembly is powered on, electromagnetic attraction is larger than the sum of liquid pressure and spring elasticity, and the valve is opened. When the coil assembly is powered off, the valve is closed by means of elastic force of the spring and liquid pressure. After the coil assembly is wound into the shell assembly, a throwing line is welded, a housing is installed, glue is poured, the magnetism isolating gasket, the spring and the valve element assembly are sequentially installed into the shell, the stroke of the valve element assembly is controlled by controlling the height of the filter screen in the assembling process, and the stroke is required to be 0.5 time of the drift diameter of the valve seat. The valve is suitable for avoiding insufficient working flow of an engine caused by swelling of the valve element by an oxidizing agent when the temperature is higher than 120 DEG C, and is suitable for small attitude and orbit control systems such as satellites, weapons and deep space exploration.

Description

Technical Field

[0001] This invention belongs to the field of engine control valve technology, specifically, it relates to an engine control valve resistant to high-temperature oxidant swelling and its assembly method, especially a small engine control valve and its assembly method that can resist material swelling caused by oxidants in high-temperature environments. Background Technology

[0002] During engine operation, the control valve, as a core component of fluid control, must withstand high temperatures and oxidant corrosion for extended periods. Traditional control valves often use metal or ordinary plastic for their valve cores, which are prone to thermal deformation under high temperatures. Furthermore, ordinary plastic materials are susceptible to swelling upon contact with oxidants, leading to abnormal valve core and seat stroke and valve failure. Simultaneously, traditional assembly processes result in low precision in valve core stroke control and unstable valve seat sealing performance, making it difficult to meet the engine's requirements for high reliability and long service life of control valves.

[0003] The utility model patent with announcement number CN214368376U mainly improves the connection sealing performance and installation convenience. Its sealing design relies on springs and pads, which are prone to aging and failure under continuous high temperature and oxidant corrosion. It does not take into account the swelling problem of valve core material in high temperature oxidants.

[0004] The utility model patent with announcement number CN216895803U involves a hydraulically operated valve, focusing on mechanical backup and support stability. It is still an improvement on general industrial valves and does not address the core issues in high-temperature oxidant environments.

[0005] To address the aforementioned problems, this invention proposes a small, high-temperature oxidizer-resistant engine control valve and its assembly method. By optimizing the selection of valve core materials, structural design, and assembly process, it solves technical pain points such as material swelling at high temperatures, low stroke accuracy, and poor sealing performance. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the purpose of this invention is to provide an engine control valve resistant to high-temperature oxidant swelling and its assembly method.

[0007] According to the present invention, an engine control valve resistant to high-temperature oxidizer swelling includes: a valve core assembly 1, a magnetic shielding gasket 2, a spring 3, a cover 4, a coil assembly 5, a throttle orifice plate 6, a valve seat 7, a filter assembly 8, and a housing assembly 9. The coil assembly 5 is wound into the housing assembly 9. The outer cover 4 of the coil assembly 5 is installed and glued. The magnetic shielding pad 2, spring 3, and valve core assembly 1 are sequentially installed into the housing assembly 9. The valve seat 7 and the filter screen assembly 8 are assembled at the outlet end of the housing assembly 9, and the throttling orifice plate 6 is installed at the inlet of the housing assembly 9. The working medium enters the valve from the side, fills the valve cavity, and then flows out through the valve seat 7 outlet. When the coil assembly 5 is energized, the electromagnetic attraction is greater than the sum of the liquid pressure and the spring force 3, and the valve opens. When the coil assembly 5 is de-energized, the valve closes by relying on the spring force 3 and the liquid pressure.

[0008] Preferably, the valve core assembly 1 includes an armature 11, a plastic valve core 12, and a retaining ring 13; There is a gap between the plastic valve core 12 and the groove of the armature 11, which is used to fill the volume expansion of the plastic valve core 12 at high temperature. The retaining ring 13 can press the plastic valve core 12 into the groove of the armature 11. The groove of the armature 11 and the end face of the retaining ring 13 are pressed flat. The retaining ring 13 has a chamfered side facing the inside of the hole. After pressing, it can be spot welded to fix it.

[0009] Preferably, the filter assembly 8 includes a filter 81 and a filter support 82; the filter 81 is fixed to the filter support 82 by spot welding around a ring; The filter assembly 8 is pressed into the housing assembly 9 by the valve seat 7 and then welded and fixed. The stroke of the control valve core assembly 1 is adjusted by controlling the height of the filter assembly 8. The stroke of the valve core assembly 1 is 0.5 times the diameter of the valve seat 7.

[0010] Preferably, the housing assembly 9 is provided with a control valve flange 91 and an inlet connector 92; The control valve flange 91 is located on the housing assembly 9, and the control valve flange 91 has a protruding step. The orifice plate 6 is located at the inlet connector 92.

[0011] Preferably, the fitting clearance between the outer circle of the valve core assembly 1 and the inner hole of the housing assembly 9 is 0.05 to 0.06 mm.

[0012] Preferably, the valve seat 7 has a rounded cutting edge design, with a cutting edge width of less than 0.2mm. Both the inner and outer sides of the valve seat 7 are provided with rounded corners with a radius of R0.1, which can improve the sealing fit between the valve seat 7 and the valve core assembly 1.

[0013] Preferably, the protruding step height of the control valve flange 91 is 0.5mm, which can effectively alleviate the thermal back-immersion phenomenon of the engine docking flange and avoid sealing failure caused by thermal deformation of the flange connection.

[0014] Preferably, the material of the plastic valve core 12 is a perfluoroalkoxy plastic.

[0015] The assembly method of an engine control valve resistant to high-temperature oxidizer swelling according to the present invention includes the following steps: Step 1: After winding the coil assembly 5 into the housing 4, weld the wire, install the housing 4 and fix it with glue; Step 2: Install the magnetic shielding pad 2, spring 3, and valve core assembly 1 into the housing assembly 9 in sequence; Step 3: Fix the filter screen 81 to the filter screen bracket 82 by spot welding around it to form the filter screen assembly 8; Step 4: Press the valve seat 7 into the housing assembly 9 and weld it in place. Then assemble the filter screen assembly 8 into the housing assembly 9. Adjust the stroke of the valve core assembly 1 by controlling the height of the filter screen assembly 8. The stroke is 0.5 times the diameter of the valve seat 7.

[0016] Preferably, the assembly process of valve core assembly 1 in step 2 is as follows: Place the plastic valve core 12 into the groove of the armature 11, leaving a gap between the plastic valve core 12 and the groove of the armature 11 to fill the gap when the plastic valve core 12 expands at high temperature; press the groove of the armature 11 and the end face of the retaining ring 13 flat, with the chamfered side of the retaining ring 13 facing the inside of the hole; after pressing, spot weld it evenly along the circumference at point X. After spot welding of valve core assembly 1, preheating treatment is performed: the preheating temperature is 200±5℃ and the preheating time is 2 hours. After the stress of plastic valve core 12 is released, plastic valve core 12 is machined to ensure that its external dimensions, geometric tolerances and surface roughness meet the design requirements.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention has excellent resistance to high temperature swelling. The plastic valve core is made of perfluoroalkoxy plastic and has an expansion gap reserved with the armature groove, which can effectively resist the material swelling caused by high temperature and oxidants, and prevent the valve core from swelling towards the valve seat and reducing the stroke opening.

[0018] 2. The present invention has high stroke accuracy. By adjusting the height of the filter assembly and fine-tuning by machining, the stroke of the valve core is precisely controlled to 0.5 times the valve seat diameter, ensuring the stability of valve opening and closing.

[0019] 3. The present invention has strong sealing reliability. The valve seat cutting edge width is less than 0.2mm and the inner and outer rounding R0.1 is matched with the valve core and the housing with a precision clearance of 0.05~0.06mm, which greatly reduces the risk of media leakage.

[0020] 4. The present invention has good structural adaptability. The control valve flange protrudes by a 0.5mm step, which can alleviate the heat back-immersion of the engine docking flange, improve the overall assembly reliability, and is suitable for the compact installation space of small engines.

[0021] 5. This invention can adapt to temperatures above 120°C, preventing the valve core from swelling due to oxidant and resulting in insufficient engine operating flow. It is suitable for small attitude and orbit control systems such as satellites, weapons, and deep space exploration. Attached Figure Description

[0022] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the structure of the engine control valve resistant to high-temperature oxidant swelling according to an embodiment of the present invention; Figure 2 for Figure 1 A schematic diagram of the structure along direction A; Figure 3 This is a schematic diagram of the valve core assembly structure; Figure 4 This is a schematic diagram of the filter assembly structure.

[0023] The diagram shows: Detailed Implementation

[0024] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0025] The purpose of this invention is to provide a high-temperature oxidant-resistant engine control valve and its assembly method, so as to achieve stable opening and closing of the valve in high-temperature environments, resist material swelling caused by oxidants, and ensure valve core stroke accuracy and sealing reliability. This valve is suitable for use at temperatures above 120°C, preventing insufficient engine flow caused by oxidant swelling of the valve core, and is applicable to small attitude and orbit control systems such as satellites, weapons, and deep space exploration.

[0026] A high-temperature oxidizer-resistant engine control valve includes: a valve core assembly 1, a magnetic shielding gasket 2, a spring 3, a cover 4, a coil assembly 5, a throttling orifice plate 6, a valve seat 7, a filter assembly 8, and a housing assembly 9. The working medium enters the valve from the side, fills the valve cavity, and then flows out through the valve seat outlet 7. When the coil assembly 5 is energized, the electromagnetic attraction is greater than the sum of the liquid pressure and the spring force of the spring 3, opening the valve. When the coil assembly 5 is de-energized, the valve closes due to the spring force of the spring 3 and the liquid pressure. The coil assembly 5 is wound into the housing assembly 9 and then welded with wire. The cover 4 is installed and glued. The magnetic shielding gasket 2, spring 3, and valve core assembly 1 are sequentially installed into the housing assembly 9.

[0027] Furthermore, the valve core assembly 1 includes an armature 11, a plastic valve core 12, and a retaining ring 13. A gap exists between the plastic valve core 12 and the groove of the armature 11. The retaining ring 13 can press the plastic valve core 12 into the groove of the armature 11 and then spot weld it in place. The filter assembly 8 includes a filter screen 81 and a filter screen support 82; the filter screen 81 is fixed to the filter screen support 82 by spot welding a ring around it. The housing assembly 9 is provided with a control valve flange 91 and an inlet connector 92, and a throttling orifice plate 6 is installed inside the inlet connector 92.

[0028] Furthermore, the filter screen assembly 8 is pressed into the housing assembly 9 by the valve seat 7 and then welded to fix it. The valve seat 7 has a rounded cutting edge design. During the filter assembly process, the stroke of the control valve core assembly 1 is adjusted by controlling the height of the filter screen assembly 8. The required stroke is 0.5 times the diameter of the valve seat 7. The control valve flange 91 is located on the housing assembly 9. The control valve flange 91 has a protruding step. The throttling orifice plate 6 is located at the inlet connector 92.

[0029] Furthermore, the filter assembly 8 places the plastic valve core 12 in the groove of the armature 11, with a gap between the plastic valve core 12 and the groove of the armature 11 to fill the gap when the plastic valve core 12 expands at high temperature. Then, the groove of the armature 11 and the end face of the retaining ring 13 are pressed flat, with the chamfered side of the retaining ring 13 facing the inside of the hole. After pressing, 8 points are immediately spot welded evenly along the circumference at point X.

[0030] Furthermore, the assembly process of valve core assembly 1 is as follows: after spot welding, preheating treatment is performed at 200±5℃ for 2 hours to release the stress of the plastic valve core 12, and then the plastic valve core 12 is machined to ensure the external dimensions, geometric tolerances and surface roughness.

[0031] Furthermore, the filter assembly 8 and the plastic valve core 12 are made of perfluoroalkoxy plastic. The fit clearance between the outer circle of the valve core assembly 1 and the inner hole of the housing assembly 9 is strictly controlled at 0.05-0.06 mm. The cutting edge width of the valve seat 7 is less than 0.2 mm, and the inner and outer rounded corners of the valve seat 7 are approximately R0.1.

[0032] Furthermore, after the filter assembly 8 is pressed into the housing assembly 9 by the valve seat 7, the stroke of the valve core assembly 1 is measured. During the assembly process, the height of the filter assembly 8 is controlled by machining the end face of the filter assembly 8, thereby adjusting the stroke of the control valve core assembly 1. The required stroke is 0.5 times the diameter of the valve seat 7.

[0033] Furthermore, the control valve flange 91 is located on the housing assembly 9, and the control valve flange 91 protrudes by a step of 0.5mm, which can effectively mitigate the thermal back-immersion effect of the engine docking flange.

[0034] The working principle is as follows: the working medium enters the valve from the side, fills the valve cavity, and then flows out through the outlet of the valve seat 7; when the coil assembly 5 is energized, the electromagnetic attraction is greater than the sum of the liquid pressure and the spring force of the spring 3, and the valve opens; when the coil assembly 5 is de-energized, the valve closes by relying on the spring force of the spring 3 and the liquid pressure.

[0035] The present invention also provides an assembly method for an engine control valve resistant to high-temperature oxidant swelling, comprising the following steps: Step 1: After winding the coil assembly 5 into the housing 4, weld the wire, install the housing 4 and fix it with glue; Step 2: Install the magnetic shielding pad 2, spring 3, and valve core assembly 1 into the housing assembly 9 in sequence; Step 3: Fix the filter screen 81 to the filter screen bracket 82 by spot welding around it to form the filter screen assembly 8; Step 4: Press the valve seat 7 into the housing assembly 9 and weld it in place. Then assemble the filter screen assembly 8 into the housing assembly 9. Adjust the stroke of the valve core assembly 1 by controlling the height of the filter screen assembly 8. The stroke of the valve core assembly 1 should be 0.5 times the diameter of the valve seat 7.

[0036] Furthermore, the assembly process of valve core assembly 1 is as follows: the plastic valve core 12 is placed into the groove of armature 11, and a gap is reserved between the plastic valve core 12 and the groove of armature 11 for the volume expansion of the plastic valve core 12 at high temperature; the groove of armature 11 and the end face of retaining ring 13 are pressed flat, and the chamfered side of retaining ring 13 faces the inside of the hole; after pressing is completed, 8 points are evenly spot welded along the circumference at point X for fixation.

[0037] Furthermore, after spot welding of valve core assembly 1, preheating treatment is required: the preheating temperature is 200±5℃, and the preheating time is 2 hours. After the stress of the plastic valve core 12 is released, the plastic valve core 12 is machined to ensure that its dimensions, geometric tolerances, and surface roughness meet the design requirements. The material of the plastic valve core 12 is perfluoroalkoxy plastic, which has excellent high temperature resistance and antioxidant swelling resistance.

[0038] Furthermore, the clearance between the outer circle of the valve core assembly 1 and the inner hole of the housing assembly 9 is strictly controlled within 0.05 to 0.06 mm to prevent media leakage or valve core jamming. The cutting edge width of the valve seat 7 is less than 0.2 mm, and both the inner and outer sides of the valve seat 7 are rounded with a radius of approximately R0.1 to improve the sealing fit between the valve seat 7 and the valve core assembly 1.

[0039] Furthermore, during the assembly of the filter assembly 8, the valve seat 7 is first pressed into the housing assembly 9, the initial stroke of the valve core assembly 1 is measured, and then the height of the filter assembly 8 is adjusted by machining the end face, thereby precisely controlling the stroke of the valve core assembly 1 to be 0.5 times the diameter of the valve seat 7.

[0040] Furthermore, the protruding step height of the control valve flange 91 is 0.5mm, which can effectively alleviate the thermal back-immersion phenomenon of the engine docking flange and avoid sealing failure caused by thermal deformation of the flange connection.

[0041] Example 1 Component preparation for control valves 1. Valve core assembly 1: Armature 11 is made of soft magnetic alloy, plastic valve core 12 is made of perfluoroalkoxy plastic, and retaining ring 13 is made of 1Cr18Ni9Ti stainless steel, with a 0.1 transition angle on one side of retaining ring 13; 2. Valve seat 7: Machined from cemented carbide 1Cr18Ni9Ti, with a cutting edge width controlled at 0.2mm and internal and external rounded corners machined to R0.1; 3. Housing assembly 9: Machined from soft magnetic alloy, the protruding step height of the control valve flange 91 is machined to 0.5mm, and the inlet connector 92 has a pre-reserved mounting groove for the throttling orifice plate 6; 4. Filter assembly 8: The filter 81 is made of 304HP stainless steel woven mesh with a filtration accuracy of 0.038. The filter support 82 is made of 1Cr18Ni9Ti stainless steel. The filter 81 and the filter support 82 are fixed by spot welding.

[0042] Example 2 The assembly process of control valves 1. Assembly of coil assembly 5 and housing 4: Wind 0.14mm diameter enameled wire into housing 4, weld the wire after winding, fill with epoxy resin, and cure at room temperature for 24 hours. 2. Assembly of valve core assembly 1: Place the plastic valve core 12 into the armature 11 groove, leaving a 0.3mm expansion gap; place the retaining ring 13 with the chamfered surface facing inward and press it flat with the end face of the armature 11 groove, and spot weld 8 points evenly along the X direction, with a weld diameter of 1mm; after spot welding, place it in an oven and preheat at 200±5℃ for 2 hours, and then machine the outer circle of the plastic valve core 12 to ensure a diameter tolerance of ±0.01mm; 3. Internal assembly of the housing: The magnetic shielding pad 2 made of electrical pure iron, the spring 3 made of 1Cr18Ni9 B with a spring force of 2.4N, and the valve core assembly 1 are sequentially installed into the housing assembly 9. The fit clearance between the outer circle of the valve core assembly 1 and the inner hole of the housing assembly 9 is checked to ensure that it is 0.05~0.06mm. 4. Assembly of valve seat 7 and filter screen assembly 8: Press valve seat 7 into housing assembly 9, measure the initial stroke of valve core assembly 1, and machine the end face of filter screen assembly 8 so that the stroke of valve core assembly 1 after assembly is 0.5 times the through diameter of valve seat 7. Assuming the through diameter is 0.7mm, the stroke is controlled to be 0.3mm. Fix by laser welding, with a weld penetration depth of 0.3 to 0.7mm. 5. Installation of orifice plate 6: Insert the orifice plate 6 with a diameter of 0.3mm into the mounting groove of the connector 92 at the inlet and fix it with threads.

[0043] Example 3 High-temperature performance testing was performed on the assembled control valve. Test environment: 40 days at 80℃ + 10 hours at 105℃, medium is nitrogen tetroxide (oxidant); Test results: After 10,000 consecutive opening and closing cycles, the valve's opening and closing response time remained stable, with an opening time of ≤10ms upon power-on and a closing time of ≤10ms upon power-off; internal leakage helium detection ≤1×10⁻⁶. -6 Pa•m 3 / s; The plastic valve core shows no obvious swelling, and there is no jamming between the valve core and the housing assembly 9, which meets the requirements for use in small engines.

[0044] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0045] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A high-temperature oxidant-resistant engine control valve, characterized in that, include: Valve core assembly (1), magnetic shielding gasket (2), spring (3), cover (4), coil assembly (5), throttling orifice plate (6), valve seat (7), filter assembly (8), housing assembly (9); The coil assembly (5) is wound into the housing assembly (9), and a cover (4) is installed on the outside of the coil assembly (5) and glue is applied. The magnetic shielding pad (2), spring (3), and valve core assembly (1) are sequentially installed into the housing assembly (9). The valve seat (7) and the filter assembly (8) are assembled at the outlet end of the housing assembly (9), and the throttling plate (6) is installed at the inlet of the housing assembly (9); The working medium enters the valve from the side, fills the valve cavity, and then flows out through the valve seat (7) outlet. When the coil assembly (5) is energized, the electromagnetic attraction is greater than the sum of the liquid pressure and the spring force (3), and the valve opens. When the coil assembly (5) is de-energized, the valve closes by relying on the spring force (3) and the liquid pressure.

2. The engine control valve resistant to high-temperature oxidizer swelling according to claim 1, characterized in that, The valve core assembly (1) includes an armature (11), a plastic valve core (12), and a retaining ring (13). There is a gap between the plastic valve core (12) and the groove of the armature (11) for filling the plastic valve core (12) when the volume expands at high temperature. The retaining ring (13) can press the plastic valve core (12) into the groove of the armature (11). The groove of the armature (11) and the end face of the retaining ring (13) are pressed flat. The retaining ring (13) has a chamfered side facing the inside of the hole. After pressing, it can be spot welded and fixed.

3. The engine control valve resistant to high-temperature oxidizer swelling according to claim 1, characterized in that, The filter assembly (8) includes a filter (81) and a filter support (82); the filter (81) is fixed to the filter support (82) by spot welding around the filter; The filter assembly (8) is pressed into the housing assembly (9) by the valve seat (7) and then welded and fixed. The stroke of the control valve core assembly (1) is adjusted by controlling the height of the filter assembly (8). The stroke of the valve core assembly (1) is 0.5 times the diameter of the valve seat (7).

4. The engine control valve resistant to high-temperature oxidizer swelling according to claim 1, characterized in that, The housing assembly (9) is provided with a control valve flange (91) and an inlet connector (92). The control valve flange (91) is located on the housing assembly (9), the control valve flange (91) has a protruding step, and the orifice plate (6) is located at the inlet connector (92).

5. The engine control valve resistant to high-temperature oxidizer swelling according to claim 1, characterized in that, The fitting clearance between the outer circle of the valve core assembly (1) and the inner hole of the housing assembly (9) is 0.05 to 0.06 mm.

6. The engine control valve resistant to high-temperature oxidizer swelling according to claim 1, characterized in that, The valve seat (7) has a rounded cutting edge design, and the width of the cutting edge of the valve seat (7) is less than 0.2mm. The inner and outer sides of the valve seat (7) are rounded with a radius of R0.1, which can improve the sealing fit between the valve seat (7) and the valve core assembly (1).

7. The engine control valve resistant to high-temperature oxidizer swelling according to claim 4, characterized in that, The protruding step height of the control valve flange (91) is 0.5mm, which can effectively alleviate the hot back-immersion phenomenon of the engine docking flange and avoid sealing failure caused by thermal deformation of the flange connection.

8. The engine control valve for resisting high-temperature oxidizer swelling according to claim 1, characterized in that, The material of the plastic valve core (12) is perfluoroalkoxy plastic.

9. A method for assembling a high-temperature oxidizer-resistant engine control valve, characterized in that, Includes the following steps: Step 1: After winding the coil assembly (5) into the cover (4), weld the stranded wire, install the cover (4) and fix it with glue; Step 2: Install the magnetic shielding pad (2), spring (3), and valve core assembly (1) into the housing assembly (9) in sequence; Step 3: Fix the filter screen (81) to the filter screen bracket (82) by spot welding around it to form the filter screen assembly (8). Step 4: Press the valve seat (7) into the housing assembly (9) and weld it in place. Then assemble the filter assembly (8) into the housing assembly (9). Adjust the stroke of the valve core assembly (1) by controlling the height of the filter assembly (8). The stroke is 0.5 times the diameter of the valve seat (7).

10. The assembly method of the high-temperature oxidizer-resistant engine control valve according to claim 9, characterized in that, The assembly process of the valve core assembly (1) in step 2 is as follows: Place the plastic valve core (12) into the groove of the armature (11), leaving a gap between the plastic valve core (12) and the groove of the armature (11) for the plastic valve core (12) to fill the volume expansion when the temperature is high; press the groove of the armature (11) and the end face of the retaining ring (13) flat, and the chamfered side of the retaining ring (13) faces the inside of the hole; after pressing, spot weld it evenly along the X direction; After the valve core assembly (1) is spot welded, it is preheated: the preheating temperature is 200±5℃ and the preheating time is 2 hours. After the stress of the plastic valve core (12) is released, the plastic valve core (12) is machined to ensure that its external dimensions, geometric tolerances and surface roughness meet the design requirements.

Images