A bidirectional unloading electromagnetic valve and torch igniter propellant supply system

Abstract

This invention relates to a bidirectional unloading solenoid valve and a propellant supply system for a flare igniter. The bidirectional unloading solenoid valve includes an electromagnet assembly, a housing, a valve core, a push rod, and a return spring. The electromagnet assembly is mounted on the housing. The valve core is installed in the inner cavity of the housing, dividing the inner cavity into an inlet and an outlet. The valve core includes an upper valve stem section, a valve plate, and a lower valve stem section. The upper half of the upper valve stem section is sealed and movably connected to the inner wall of the housing, and the lower half of the lower valve stem section is also sealed and movably connected to the inner wall of the housing. The junction of the inlet and outlet serves as the valve port. A return spring is sleeved on the lower valve stem section. The cross-sectional area of ​​the connection between the upper half of the upper valve stem section and the inner wall of the housing, as well as the cross-sectional area of ​​the connection between the lower half of the lower valve stem section and the inner wall of the housing, are both equal to the valve port area. The electromagnet assembly is connected to the upper end of the upper valve stem section via the push rod and drives the valve core to move axially to open or close the valve port.

Description

Technical Field

[0001] This invention relates to the field of rocket engine technology, specifically to a bidirectional unloading solenoid valve and a propellant supply system for a flare igniter. Background Technology

[0002] With the development of reusable launch vehicles, there is an urgent need for the multiple restart capability of rocket engines. As a key core component of liquid rocket engines, the flare igniter's technological level directly determines the engine's restart reliability, number of uses, and mission adaptability. The flare igniter's propellant supply system controls the supply of fuel and oxidizer, stably delivering them to the igniter's combustion chamber for combustion on demand and in proportion. A conventional flare igniter's propellant supply system mainly consists of a high-pressure cylinder, a self-locking valve, a pressure-reducing valve, a solenoid valve, and a check valve. The solenoid valve opens or closes upon receiving an ignition command, controlling the propellant flow. The check valve is directly connected to the combustion chamber and must withstand the high pressure from the combustion chamber during the engine's stable operation phase while ensuring stable and reliable sealing. When the system ignition command is issued, fuel and oxidizer exit from the high-pressure cylinder, pass through the self-locking valve and the pressure-reducing valve (which reduces the propellant pressure from high to low), then through the solenoid valve and the check valve, and finally enter the flare's combustion chamber. These valves must be able to open and close precisely within milliseconds to achieve accurate timing control during multiple engine starts.

[0003] The defects and shortcomings of the existing technology are as follows: 1. When the propellant flow rate is low, the one-way valve is at risk of continuous opening and closing vibration, which leads to unstable ignition flame of the torch igniter. 2. When the one-way valve seal fails, the high pressure in the combustion chamber will be transmitted in reverse to the upstream pipeline, causing the pressure in the upstream pipeline to rise, which will reduce the opening margin of the solenoid valve or even prevent it from opening. 3. The propellant supply system of the flare igniter has a complex pipeline structure, is heavy, and has a long response time. Summary of the Invention

[0004] In order to solve one or more technical problems existing in the prior art, the present invention provides a bidirectional unloading solenoid valve and a flare igniter propellant supply system.

[0005] The technical solution of this invention to solve the above-mentioned technical problems is as follows: This invention provides a bidirectional unloading solenoid valve, including an electromagnet assembly, a housing, a valve core, a push rod, and a return spring. The electromagnet assembly is assembled on the housing, and the valve core is installed in the inner cavity of the housing, dividing the inner cavity into an inlet and an outlet cavity that are interconnected. The valve core includes an upper valve stem section, a valve plate, and a lower valve stem section. The upper half of the upper valve stem section is movably and sealingly connected to the inner cavity sidewall of the housing, and the lower half of the lower valve stem section is connected to the inner cavity sidewall of the housing. The valve is sealed and movable, with the upper valve stem section located inside the inlet cavity, and the valve plate and the lower valve stem section located inside the outlet cavity. The junction between the inlet and outlet cavities serves as the valve port. The upper surface of the valve plate is provided with a first sealing ring for sealing the valve port, and a return spring is sleeved on the lower valve stem section. The cross-sectional area of ​​the connection between the upper half of the upper valve stem section and the sealing point of the inner wall of the housing, as well as the cross-sectional area of ​​the connection between the lower half of the lower valve stem section and the sealing point of the inner wall of the housing, are both equal to the area of ​​the valve port. The housing has an inlet channel and an outlet channel. The inlet channel is connected to the inlet cavity, and the outlet channel is connected to the outlet cavity. The electromagnet assembly drives the valve core to move axially through a push rod to open or close the valve port.

[0006] The beneficial effects of this invention are as follows: The bidirectional unloading solenoid valve of this invention, by setting a multi-segment valve stem structure and designing the cross-sectional area of ​​different segments, has the advantages of fast response speed, high sealing reliability, stable opening performance and high reverse pressure resistance. It can replace the complex valve combination control scheme in the conventional flare ignition propellant control system, and does not require the setting of one-way valves or other valves, thereby improving the integration of the flare ignition system, reducing the system weight, and improving the sealing, operation reliability and accuracy of ignition timing control.

[0007] Based on the above technical solution, the present invention can be further improved as follows.

[0008] Furthermore, a downwardly extending sealing blade is formed on the lower surface of the valve port, and the sealing blade cooperates with the first sealing ring on the valve plate to seal the valve port.

[0009] The beneficial effect of adopting the above-mentioned further solution is that by setting a sealing blade, it can effectively cooperate with the sealing ring on the valve plate to achieve sealing.

[0010] Furthermore, the cross-sectional area of ​​the upper half of the upper valve stem segment is greater than the cross-sectional area of ​​the lower half of the upper valve stem segment, and the cross-sectional area of ​​the upper half of the lower valve stem segment is smaller than the cross-sectional area of ​​the lower half of the lower valve stem segment.

[0011] The beneficial effect of adopting the above-mentioned further scheme is that it facilitates the formation of the inlet and outlet of the oral cavity.

[0012] Furthermore, the cross-sectional area of ​​the lower half of the upper valve stem section is equal to the cross-sectional area of ​​the upper half of the lower valve stem section.

[0013] Furthermore, the inner cavity of the housing is open at both the top and bottom. The electromagnet assembly is installed at the upper end of the housing, and a sleeve and a nut are installed at the lower end of the housing. The sleeve is fitted inside the lower end of the housing, and the outer peripheral sidewall of the sleeve is sealed to the inner sidewall of the housing. The lower half of the lower valve stem section is fitted inside the sleeve and is sealed to the sleeve. The nut is threaded inside the lower end of the housing and positions the sleeve.

[0014] The beneficial effect of adopting the above-mentioned further solution is that by setting a sleeve and a nut, it is convenient to limit the lower valve stem.

[0015] Furthermore, a ring plate is fixed on the inner side wall of the middle part of the sleeve, and the inner side wall of the sleeve below the ring plate is in a sealed and movable connection with the lower half of the lower valve stem section, and the lower end of the return spring abuts against the ring plate.

[0016] The beneficial effect of adopting the above-mentioned further solution is that by setting the ring plate, it is convenient for the return spring to abut and limit.

[0017] Furthermore, the inlet channel and the outlet channel are respectively at a set angle to the valve core, and the set angle is not equal to 180°.

[0018] Furthermore, a sonic nozzle is installed inside the inlet channel, and the sonic nozzle is sealed on the inner wall of the inlet channel by a second sealing ring.

[0019] The beneficial effects of adopting the above-mentioned further scheme are as follows: through the throttling effect of the sonic nozzle, the fluid in the throat of the sonic nozzle can reach the speed of sound and generate a blocked flow. When the pressure in the pipeline before the valve inlet changes, the fluid in the throat is always in a sonic blocked flow state, which can ensure that the propellant flow through the sonic nozzle does not change, thereby achieving precise control of the propellant flow in the downstream pipeline.

[0020] The present invention also provides a propellant supply system for a flare igniter, including a bidirectional unloading solenoid valve as described above, and further including a combustion chamber, a fuel supply pipeline and an oxidizer supply pipeline. The fuel supply pipeline and the oxidizer supply pipeline are respectively connected to and communicate with the combustion chamber, and the bidirectional unloading solenoid valve is provided on both the fuel supply pipeline and the oxidizer supply pipeline.

[0021] The beneficial effects of the present invention are: the propellant supply system for the flare igniter of the present invention simplifies the structure of the propellant supply system for the flare igniter, which helps to reduce the system weight and improve the system reliability and response speed.

[0022] Furthermore, both the fuel supply line and the oxidant supply line are equipped with self-locking valves, which are located upstream of the bidirectional unloading solenoid valve in their respective lines. Attached Figure Description

[0023] Figure 1 This is a cross-sectional structural schematic diagram of the bidirectional unloading solenoid valve of the present invention; Figure 2 for Figure 1 Enlarged structural diagram of section A in the middle; Figure 3 This is a schematic diagram of the structure of the electromagnet assembly of the present invention; Figure 4 This is a schematic diagram of the connection structure of the propellant supply system for the torch igniter of the present invention; Figure 5 A schematic diagram of the connection structure of the existing torch igniter propellant supply system.

[0024] The attached diagram lists the components represented by each number as follows: 100. Two-way unloading solenoid valve; 101. Self-locking valve; 102. Pressure reducing valve; 103. Check valve; 104. Oxidizer supply section; 105. Fuel supply section; 106. Combustion chamber; 107. Fuel supply line; 108. Oxidizer supply line; 109. Solenoid valve; 1. Electromagnetic coil; 11. Suction platform; 12. Coil frame; 13. End cap; 14. Adjusting shim; 15. Cover; 16. Armature; 2. Housing; 21. Inlet chamber; 22. Outlet chamber; 23. Valve port; 24. Inlet channel; 25. Outlet channel; 26. Sealing blade; 27. Sonic nozzle; 28. Second sealing ring; 29. ​​Third sealing ring; 290. Fourth sealing ring; 3. First upper valve stem section; 31. Second upper valve stem section; 32. First lower valve stem section; 33. Second lower valve stem section; 34. Valve plate; 35. First sealing ring; 36. Return spring; 4. Top rod; 5. Sleeve; 51. Ring plate; 52. Fifth sealing ring; 6. Nuts. Detailed Implementation

[0025] The principles and features of the present invention are described below. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0026] Example 1 like Figures 1-3 As shown, a bidirectional unloading solenoid valve of this embodiment includes an electromagnet assembly, a housing 2, a valve core, a push rod 4, and a return spring 36. The electromagnet assembly is assembled on the housing 2. The valve core is installed in the inner cavity of the housing 2, dividing the inner cavity into an inlet cavity 21 and an outlet cavity 22 that are interconnected. The valve core includes an upper valve stem section, a valve plate 34, and a lower valve stem section that are coaxially connected in sequence. The upper half of the upper valve stem section is sealingly and movably connected to the inner cavity sidewall of the housing 2, and the lower half of the lower valve stem section is sealingly and movably connected to the inner cavity sidewall of the housing 2. The upper valve stem section is located inside the inlet cavity 21. The valve plate 34 and the lower valve stem section are located inside the outlet cavity 22. The junction of the inlet cavity 21 and the outlet cavity 22 serves as the valve port 23. The upper surface of the valve plate 34 is provided with a first sealing ring 35 for sealing the valve port 23. A return spring 36 is sleeved on the lower valve stem section. The two ends of the return spring 36 abut against the lower surface of the valve plate 34 and the inner wall of the housing 2, respectively. The cross-sectional area of ​​the connection between the upper half of the upper valve stem section and the sealing point of the inner wall of the housing cavity, and the cross-sectional area of ​​the connection between the lower half of the lower valve stem section and the sealing point of the inner wall of the housing cavity, are both equal to the area of ​​the valve port 23. The housing 2 is provided with an inlet channel 24 and an outlet channel 25. The inlet channel 24 is connected to the inlet cavity 21, and the outlet channel 25 is connected to the outlet cavity 22. The electromagnet assembly is connected to the upper end of the upper valve stem section through the push rod 4 and drives the valve core to move axially to open or close the valve port 23.

[0027] like Figure 2 As shown, preferably, a downwardly extending sealing blade 26 is formed on the lower surface of the valve port 23. The sealing blade 26 cooperates with the first sealing ring 35 on the valve plate 34 to seal the valve port 23. By providing the sealing blade, it can effectively cooperate with the sealing ring on the valve plate to achieve a seal.

[0028] like Figure 1 and Figure 2 As shown, in a preferred embodiment, the cross-sectional area of ​​the upper half of the upper valve stem segment is larger than that of the lower half, and the cross-sectional area of ​​the upper half of the lower valve stem segment is smaller than that of the lower half, facilitating the formation of the inlet chamber 21 and the outlet chamber 22. The cross-sectional area of ​​the lower half of the upper valve stem segment is equal to that of the upper half of the lower valve stem segment.

[0029] One specific solution in this embodiment is as follows: Figure 1 and Figure 2As shown, the upper half of the upper valve stem section is the first upper valve stem section 3, the lower half of the upper valve stem section is the second upper valve stem section 31, the upper half of the lower valve stem section is the first lower valve stem section 32, and the lower half of the lower valve stem section is the second lower valve stem section 33. The outer wall of the first upper valve stem section 3 is sealed to the inner wall of the housing 2 through a fourth sealing ring 290.

[0030] Specifically, such as Figure 1 and Figure 2 As shown, the inlet channel 24 and the outlet channel 25 are respectively at a set angle to the valve core, and the set angle is not equal to 180°.

[0031] A preferred embodiment of this solution is as follows: Figure 1 As shown, a sonic nozzle 27 is installed inside the inlet channel 24. The sonic nozzle 27 is sealed to the inner wall of the inlet channel 24 by a second sealing ring 28. Through the throttling effect of the sonic nozzle, the fluid in the throat of the sonic nozzle can reach the speed of sound and generate a blocked flow. When the pressure in the pipeline before the valve inlet changes, the fluid in the throat is always in a sonic blocked flow state, which can ensure that the propellant flow rate through the sonic nozzle does not change, thereby achieving precise control of the propellant flow rate in the downstream pipeline.

[0032] Specifically, such as Figure 1 and Figure 3 As shown, the solenoid valve assembly of this embodiment includes a solenoid coil 1, a suction platform 11, a coil frame 12, a plug 13, an adjusting shim 14, a cover 15, and an armature 16. The coil frame 12 is installed on the top of the housing 2. The armature 16 and the suction platform 11, arranged vertically, are installed inside the coil frame 12. The suction platform 11 is sealed to the inner wall of the coil frame 12 by the adjusting shim 14. The lower end of the suction platform 11 is inserted into the open top end of the housing 2 and abuts against the fourth sealing ring 290. The solenoid coil 1 is sleeved on the coil frame 12. The cover 15 covers the outside of the solenoid coil 1 and the coil frame 12. The push rod 4 is movably sleeved inside the suction platform 11 and is coaxially arranged with the valve core. The two ends of the upper end of the push rod 4 can abut against the armature 16 and the upper end of the valve core, respectively. The plug 13 seals the upper end of the coil frame 12.

[0033] The working principle of a bidirectional unloading solenoid valve in this embodiment is as follows: When the solenoid coil is not energized, under the spring force of the return spring, the first sealing ring on the valve plate is sealed and fitted with the sealing edge of the housing, and the valve port is in a closed state; when the solenoid coil is energized, a stable magnetic circuit is formed between the coil frame, the housing, the suction platform, and the armature, generating an electromagnetic attraction force on the armature, attracting the armature to move downward, and then pushing the valve core downward through the push rod, thus opening the valve; when the solenoid coil is de-energized, the electromagnetic force disappears, and under the spring force of the return spring, the valve core moves upward, and the valve closes.

[0034] This embodiment of a bidirectional unloading solenoid valve, by setting a multi-segment valve stem structure and designing the cross-sectional area of ​​different segments, has advantages such as fast response speed, high sealing reliability, stable opening performance and high reverse pressure resistance. It can replace the complex valve combination control scheme in the conventional flare ignition propellant control system, eliminating the need for check valves and other valves, thereby improving the integration of the flare ignition system, reducing system weight, and improving sealing, operational reliability and the accuracy of ignition timing control.

[0035] This embodiment presents a bidirectional unloading solenoid valve that can be used in a torch igniter propellant supply system. It controls the flow of propellant according to the system ignition command, and can achieve stable and reliable operation under different inlet pressures. It also has a high reverse pressure resistance, and can achieve stable and reliable reverse sealing within the reverse pressure range of 0-90MPa. It has passed pressure tests with reverse pressure of 45MPa nitrogen and 90MPa water, and its sealing performance is qualified. It has a sealing capability of 3 minutes / 0 bubbles.

[0036] Example 2 Based on Embodiment 1, this embodiment provides a preferred structure for the housing, such as... Figure 1 and Figure 2 As shown, in this embodiment, the inner cavity of the housing 2 is open at both the top and bottom. The electromagnet assembly is installed at the upper end of the housing 2, and a sleeve 5 and a nut 6 are installed at the lower end of the housing 2. The sleeve 5 is fitted inside the lower end of the housing 2, and its outer peripheral sidewall is sealed to the inner sidewall of the housing 2. The lower half of the lower valve stem is fitted inside the sleeve 5 and is sealed to the sleeve 5. The nut 6 is threaded inside the lower end of the housing 2 and positions the sleeve 5. By providing the sleeve and nut, it is convenient to limit the movement of the lower valve stem.

[0037] like Figure 1 and Figure 2As shown, preferably, a ring plate 51 is fixed on the inner sidewall of the middle part of the sleeve 5. The inner sidewall of the sleeve 5 below the ring plate 51 is in a sealed and movably connected to the lower half of the lower valve stem section. The lower end of the return spring 36 abuts against the ring plate 51. By setting the ring plate, the abutment and limiting of the return spring can be facilitated.

[0038] Specifically, such as Figure 1 and Figure 2 As shown, the upper end face of the nut 6 is sealed to the inner wall of the housing 2 by a third sealing ring 29, and the outer wall of the sleeve 5 is also sealed to the inner wall of the housing 2 by the third sealing ring 29. The outer wall of the second lower valve stem section 33 is connected to the inner wall of the sleeve 5 by a fifth sealing ring 52.

[0039] Example 3 This embodiment provides a propellant supply system for a flare igniter, including a bidirectional unloading solenoid valve as described in Embodiment 1 or Embodiment 2 above, and also includes a combustion chamber 106, a fuel supply line 107, and an oxidizer supply line 108. The fuel supply line 107 and the oxidizer supply line 108 are respectively connected to and communicate with the combustion chamber 106, and the bidirectional unloading solenoid valve 100 is provided on both the fuel supply line 107 and the oxidizer supply line 108.

[0040] like Figure 4 As shown, in this embodiment, both the fuel supply line 107 and the oxidant supply line 108 are equipped with a self-locking valve 101, which is located upstream of the bidirectional unloading solenoid valve 100 in the respective line.

[0041] Specifically, the fuel supply pipeline 107 and the oxidant supply pipeline 108 are respectively provided with a fuel supply section 105 and an oxidant supply section 104. The fuel supply section 105 is located upstream of the self-locking valve 101 on the pipeline, and the oxidant supply section 104 is located upstream of the self-locking valve 101 on the pipeline.

[0042] In this embodiment of the torch igniter propellant supply system, fuel and oxidizer flow in from their respective valve inlet channels. When the electromagnetic coil 1 is not energized, under the spring force of the return spring 36, the valve plate 34 of the valve core is in contact with the sealing edge 26 of the housing 2, preventing fuel and oxidizer from passing through the valve, which is in a closed state. When the electromagnetic coil 1 is energized, a stable magnetic circuit is formed between the coil frame 12, the cover 15, the attraction platform 11, and the armature 16, generating an electromagnetic attraction force on the armature 16, causing it to move downwards. This force, through the push rod 4, pushes the valve core downwards, and the sealing surface of the valve plate 34 of the valve core and the sealing edge 26 on the housing 2 are no longer in contact, allowing fuel and oxidizer to pass through the valve, which is in an open state. When the electromagnetic coil 1 is de-energized, the electromagnetic force disappears, and under the spring force of the return spring 36, the valve core moves upwards, and the sealing surface of the valve core and the sealing edge 26 on the housing 2 re-engage, cutting off the flow of fuel and oxidizer. The valve then returns to and remains in a closed state.

[0043] When the electromagnetic coil 1 is not energized, under the spring force of the return spring 26, the sealing surface of the valve core is in contact with the sealing edge 26 of the housing 2, preventing fuel and oxidizer from passing through the valve, thus keeping the valve closed. When the valve outlet is subjected to reverse high pressure, the gas pressure acts simultaneously on the sealing surface of the valve core and the fifth sealing ring 52. The valve core simultaneously bears both upward and downward media forces. Since the areas of action of the upward and downward media are equal, the resultant force is zero, and the valve core is in a state of force equilibrium. When the reverse pressure on the valve changes, the overall force on the valve core remains unchanged, thus ensuring stable and reliable sealing and operation under different reverse pressures.

[0044] When the electromagnetic coil 1 is not energized, under the spring force of the return spring 36, the sealing surface of the valve core is in contact with the sealing blade 26 of the housing 2, preventing fuel and oxidant from passing through the valve, thus keeping the valve closed. When oxidant or fuel flows in from the valve inlet, the propellant pressure acts simultaneously on the fourth sealing ring 290 and the valve core sealing surface. The valve core simultaneously bears both upward and downward media forces. Since the upward and downward media action areas are equal, the resultant force is zero, and the valve core is in a state of force equilibrium. When the valve inlet pressure changes, the overall force on the valve core remains unchanged, thus ensuring stable and reliable sealing and operation under different inlet pressures.

[0045] Among them, such as Figure 5As shown, the existing fuel supply line 107 requires a pressure reducing valve 102, a solenoid valve 109, and a check valve 103. These valves occupy a large space, are heavy, have a long response time, and lack integration. When the system ignition command is issued, fuel and oxidizer exit from the high-pressure cylinder, pass through a self-locking valve and a pressure reducing valve (reducing the propellant pressure from high to low), then through a solenoid valve and a check valve, and finally enter the combustion chamber of the flare. However, in this invention, because the inlet of the bidirectional unloading solenoid valve adopts an unloading structure, changes in the inlet propellant pressure will not affect the valve's sealing and operating capabilities, thus eliminating the need for a pressure reducing valve in the conventional flare igniter's propellant supply system. The outlet also adopts an unloading structure, so changes in the outlet medium pressure will not affect the valve's sealing and operating capabilities. The valve has the ability to withstand reverse pressure, thus eliminating the need for a check valve in the conventional flare igniter's propellant supply system. In this invention, after the system ignition command is issued, fuel and oxidizer exit from the high-pressure cylinder, pass through a self-locking valve, and then through a bidirectional unloading solenoid valve before entering the combustion chamber of the flare. This significantly reduces the types and number of valves in the propellant supply system, shortens the propellant flow path, and improves system response speed. In summary, the propellant supply system of the flare igniter using a bidirectional unloading solenoid valve can simultaneously eliminate the pressure-reducing valve before the flare and the one-way valve after the flare, effectively reducing the weight of the flare igniter, improving system reliability, and increasing response speed.

[0046] The propellant supply system for the flare igniter in this embodiment, by incorporating the aforementioned bidirectional unloading solenoid valve, has a wide applicable pressure range, achieving stable and reliable operation and sealing under different inlet pressures. It possesses strong reverse pressure resistance, maintaining a reliable sealing capability of 3 minutes / 0 bubbles within the 0–45 MPa range, exhibiting stable operation and high reliability. After undergoing a life test of 5000 cycles, the response time showed no significant change, which is beneficial for precise timing control of the flare ignition system. The simplified structure of the flare igniter propellant supply system helps reduce system weight and improve system reliability and response speed.

[0047] The propellant supply system for the flare igniter in this embodiment simplifies the structure of the propellant supply system for the flare igniter, which helps to reduce the system weight and improve the system reliability and response speed.

[0048] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "horizontal", "top", "inner", "outer", "axial", 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 invention 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 invention.

[0049] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0050] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0051] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0052] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0053] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A bidirectional unloading solenoid valve, characterized in that, The device includes an electromagnet assembly, a housing, a valve core, a push rod, and a return spring. The electromagnet assembly is mounted on the housing. The valve core is installed in the inner cavity of the housing, dividing the inner cavity into an inlet and an outlet. The valve core includes an upper valve stem section, a valve plate, and a lower valve stem section. The upper half of the upper valve stem section is movably and sealingly connected to the inner cavity sidewall of the housing, and the lower half of the lower valve stem section is also movably and sealingly connected to the inner cavity sidewall of the housing. The upper valve stem section is located in the inlet, and the valve plate and the lower valve stem section are located in the outlet. The junction between the inlet and outlet serves as the valve port. The upper surface of the valve plate is provided with a first sealing ring for sealing the valve port. A return spring is fitted on the lower valve stem section. The cross-sectional areas of the connection points between the upper half of the upper valve stem section and the inner cavity sidewall of the housing, as well as the cross-sectional areas of the connection points between the lower half of the lower valve stem section and the inner cavity sidewall of the housing, are both equal to the area of ​​the valve port. The housing has an inlet channel and an outlet channel. The inlet channel is connected to the inlet cavity, and the outlet channel is connected to the outlet cavity. The electromagnet assembly drives the valve core to move axially through a push rod to open or close the valve port.

2. The bidirectional unloading solenoid valve according to claim 1, characterized in that, A downwardly extending sealing blade is formed on the lower surface of the valve port, and the sealing blade cooperates with the first sealing ring on the valve plate to seal the valve port.

3. The bidirectional unloading solenoid valve according to claim 1, characterized in that, The cross-sectional area of ​​the upper half of the upper valve stem section is greater than the cross-sectional area of ​​the lower half of the upper valve stem section, and the cross-sectional area of ​​the upper half of the lower valve stem section is smaller than the cross-sectional area of ​​the lower half of the lower valve stem section.

4. The bidirectional unloading solenoid valve according to claim 1, characterized in that, The cross-sectional area of ​​the lower half of the upper valve stem section is equal to the cross-sectional area of ​​the upper half of the lower valve stem section.

5. The bidirectional unloading solenoid valve according to claim 1, characterized in that, The inner cavity of the housing is open at both the top and bottom. The electromagnet assembly is installed at the upper end of the housing. A sleeve and a nut are installed at the lower end of the housing. The sleeve is fitted inside the lower end of the housing. The outer peripheral sidewall of the sleeve is sealed to the inner sidewall of the housing. The lower half of the lower valve stem section is fitted inside the sleeve and is sealed to the sleeve. The nut is threaded inside the lower end of the housing and positions the sleeve.

6. The bidirectional unloading solenoid valve according to claim 5, characterized in that, A ring plate is fixed on the inner side wall of the middle part of the sleeve. The inner side wall of the sleeve below the ring plate is sealed and movably connected to the lower half of the lower valve stem section. The lower end of the return spring abuts against the ring plate.

7. The bidirectional unloading solenoid valve according to claim 1, characterized in that, The inlet channel and outlet channel are respectively at a set angle to the valve core, and the set angle is not equal to 180°.

8. The bidirectional unloading solenoid valve according to claim 1, characterized in that, A sonic nozzle is installed inside the inlet channel, and the sonic nozzle is sealed on the inner wall of the inlet channel by a second sealing ring.

9. A propellant supply system for a flare igniter, characterized in that, The invention includes a bidirectional unloading solenoid valve as described in any one of claims 1 to 8, and further includes a combustion chamber, a fuel supply line, and an oxidant supply line, wherein the fuel supply line and the oxidant supply line are respectively connected to and communicate with the combustion chamber, and the bidirectional unloading solenoid valve is provided on both the fuel supply line and the oxidant supply line.

10. A flare igniter propellant supply system according to claim 9, characterized in that, Both the fuel supply line and the oxidizer supply line are equipped with self-locking valves, which are located upstream of the bidirectional unloading solenoid valve in their respective lines.

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