Control solenoid for a rocket system

Abstract

The application provides a control electromagnetic valve for a rocket system, which comprises a main valve and a pilot valve, the main valve comprising a valve body, a main valve spool, a guide sleeve, a main valve spring, a piston, an exhaust valve and an end cover. The pilot valve is used for conducting or closing between the third channel and the fourth channel; the exhaust valve comprises an exhaust shell and an exhaust valve seat, the exhaust valve seat is provided with an exhaust hole communicated with the first channel, the exhaust shell is located outside the valve body, the exhaust valve seat is arranged between the main valve spool and the piston, the outer wall of the exhaust valve seat is tightly and sealingly connected with the inner wall of the first channel, and the inner wall of the exhaust valve seat is provided with a gap with the circumferential outer side of the small-diameter part of the piston, so that the gas in the second channel entering the first channel is discharged to the outside of the valve body through the gap and the exhaust structure in the exhaust valve seat and then through the exhaust shell. The electromagnetic valve can improve the working performance and reliability of the valve.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power system valves, in particular to a control electromagnetic valve for a rocket system. BACKGROUND

[0002] With the rapid development of the aerospace industry, the technologies involved in the rocket field have also made great progress. In particular, electromagnetic valves are needed to open and close the downstream propellant control valve to realize the on-off of the propellant and the combustion chamber during the start-up and shutdown stages of the liquid oxygen-methane engine. Electromagnetic valves can effectively ensure that the liquid rocket engine completes the start-up and shutdown process in a timely manner due to their advantages of high pressure, large diameter, fast response, and high reliability. In addition, electromagnetic valves can also be used to control the on-off of other gas paths of the engine.

[0003] Currently, when the electromagnetic valve is opened, a small amount of gas enters the inner cavity of the valve body and is not easy to discharge, which affects the repeated movement of the piston of the valve body and further affects the movement of the valve core, causing the opening or closing of the electromagnetic valve to be delayed, which seriously affects the reliability of the product.

[0004] There is an urgent need to provide a control electromagnetic valve for a rocket system, which can quickly discharge the small amount of gas entering the inner cavity of the valve body, reduce the resistance of the gas to the piston, and thus ensure the safe opening or closing of the electromagnetic valve and improve the reliability of the valve product. SUMMARY

[0005] The present application aims to overcome the shortcomings of the prior art and provide a control electromagnetic valve for a rocket system, which can quickly discharge the small amount of gas entering the inner cavity of the valve body, reduce the resistance of the gas to the piston, and thus ensure the safe opening or closing of the electromagnetic valve and improve the reliability of the valve product.

[0006] The present application provides a control electromagnetic valve for a rocket system, which comprises a main valve and a pilot valve,

[0007] The main valve comprises a valve body, a main valve core, a guide sleeve, a main valve spring, a piston, an exhaust valve, and an end cover,

[0008] The inner side of the valve body has a first channel for gas flow and a second channel that communicates with the first channel and has a different extension direction, the first channel comprises a large diameter portion and a small diameter portion, the main valve core, the guide sleeve, the main valve spring, the exhaust valve, and the piston are located in the large diameter portion, and the end cover is located at one end of the valve body;

[0009] The part of the valve body radially away from the first channel is provided with a containing part, and a third channel and a fourth channel connected with the containing part; the air inlet of the third channel is communicated with the air inlet end of the small diameter part of the first channel, the air outlet of the third channel is communicated with the air inlet end of the containing part, the air outlet end of the containing part is communicated with the air inlet of the fourth channel, and the air outlet of the fourth channel is communicated with the air hole on the guide sleeve;

[0010] The pilot valve is used for guiding the communication or closing between the third channel and the fourth channel.

[0011] The exhaust valve comprises an exhaust shell and an exhaust valve seat, the exhaust valve seat is provided with an exhaust hole communicated with the first channel, the exhaust shell is located outside the valve body, the exhaust valve seat is arranged between the main valve spool and the piston, the outer wall of the exhaust valve seat is tightly and sealingly connected with the inner wall of the first channel, and the inner wall of the exhaust valve seat has a gap with the circumferential outer side of the small diameter part of the piston, so that the gas entering the first channel from the second channel is discharged to the outside of the valve body through the gap and the exhaust structure in the exhaust valve seat and then through the exhaust shell.

[0012] Further, the exhaust shell is internally provided with an exhaust channel communicated with the exhaust structure.

[0013] Further, downstream of the exhaust channel, the exhaust shell comprises a closed end, the closed end comprises a closed plate, a flexible gasket, a compression gasket and a locking piece; the closed plate comprises a central hole and a plurality of air distribution holes distributed around the central hole, the circumferential outer surface of the closed plate is connected with the inner wall of the exhaust shell, one end of the locking piece is sequentially penetrated through the compression gasket and the flexible gasket arranged concentrically and then is threadedly connected with the central hole to fix the flexible gasket on the closed plate, the other end is close to the end face of the side of the compression gasket to tightly abut the compression gasket to fix the compression gasket on the flexible gasket, and the flexible gasket covers the central hole and the air distribution holes.

[0014] Further, the flexible gasket and the compression gasket are in the shape of a circular plate, and the diameter of the flexible gasket is greater than that of the compression gasket.

[0015] Further, the flexible gasket is a rubber gasket, and the compression gasket is a stainless steel metal gasket.

[0016] Further, the exhaust valve seat comprises a front exhaust valve seat and a rear exhaust valve seat; the front exhaust valve seat is located on the side close to the main valve spool, and the rear exhaust valve seat is located on the side close to the guide sleeve; the front exhaust valve seat is a cylindrical structure with both ends communicated, and the rear exhaust valve seat is in the shape of a cylindrical structure.

[0017] The rear valve seat is provided with the exhaust structure, which comprises a first exhaust hole parallel to the center line of the rear valve seat and a second exhaust hole radially extending along the rear valve seat and communicating with the first exhaust hole; the rear valve seat is circumferentially provided with an annular groove concave to the center of the rear valve seat,

[0018] The gas enters the annular groove through the first exhaust hole and the second exhaust hole in sequence, and then is discharged from the valve body through the exhaust hole of the closed end of the exhaust shell after passing through the exhaust passage of the exhaust shell.

[0019] Further, the outer diameter of the front valve seat is smaller than that of the rear valve seat, and the transition surface is formed between the front valve seat and the rear valve seat along the direction from the front valve seat to the rear valve seat, and the transition surface abuts against the protruding platform of the inner wall of the valve body.

[0020] Further, the first exhaust hole is arranged on the rear valve seat and located on the inner side of the rear valve seat close to the front valve seat.

[0021] Further, the front valve seat and the rear valve seat are designed in an integrated manner.

[0022] Further, the pilot valve comprises an electromagnet assembly, an upper pilot valve top rod, a lower pilot valve top rod, a first guide spring and a pilot valve spool; the upper pilot valve top rod and the lower pilot valve top rod are located on the inner side of the electromagnet assembly, the lower end of the upper pilot valve top rod is connected with the upper end of the first guide spring, the lower end of the first guide spring is connected with the upper end of the lower pilot valve top rod, and the lower end of the lower pilot valve top rod is used for connecting with the pilot valve spool; the pilot valve spool is located in the accommodating portion, and the pilot valve spool is controlled to move up and down by the on-off electricity of the electromagnet assembly, so as to make the third channel and the fourth channel conductive or closed;

[0023] When the pilot valve is opened, the gas medium pushes the piston to move away from the end cover through the third channel, the accommodating portion, the fourth channel and the gas hole in sequence from the gas inlet end of the small-diameter part, so as to drive the main valve spool to move along the axial direction of the first channel, and one end of the main valve spool abuts against the transition part from the large-diameter part to the small-diameter part, so as to complete the closing of the main valve.

[0024] Compared with the prior art, the present application has at least one of the following beneficial effects:

[0025] The control electromagnetic valve for the rocket system provided by the embodiment of the present application is composed of a main valve and a pilot valve, and comprises the main valve and the pilot valve. The exhaust valve is composed of an exhaust shell and an exhaust valve seat, the exhaust valve seat is provided with an exhaust hole in communication with the first channel, the exhaust shell is located outside the valve body, the exhaust valve seat is arranged between the main valve spool and the piston, the outer wall of the exhaust valve seat is tightly and sealingly connected with the inner wall of the first channel, and the inner wall of the exhaust valve seat is spaced apart from the circumferential outer side of the small-diameter part of the piston so that the gas entering the first channel from the second channel is discharged to the outside of the valve body through the exhaust structure in the exhaust valve seat and the exhaust shell.

[0026] The exhaust shell and the exhaust valve seat are arranged in the whole electromagnetic valve, so that the gas entering the first channel from the second channel is quickly discharged from the valve body, thereby reducing the resistance of the gas to the piston, facilitating the piston to quickly push the spool to move, and ensuring the safe opening or closing of the electromagnetic valve, improving the reliability of the valve product and the response speed of the electromagnetic valve.

[0027] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the scope of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0028] The following drawings are part of the specification of the present application, which illustrates the example embodiments of the present application, and the accompanying drawings and the description of the specification are used to illustrate the principles of the present application.

[0029] Figure 1 It is a structure schematic view of the electromagnetic valve section in the embodiment of the present application;

[0030] Figure 2 It is a left view of the electromagnetic valve in the embodiment of the present application;

[0031] Figure 3 It is a sectional view of the exhaust valve in the embodiment of the present application;

[0032] Figure 4 It is a structure diagram of the closed end of the exhaust shell in the embodiment of the present application;

[0033] Figure 5 It is a structure diagram of the exhaust valve seat in the embodiment of the present application;

[0034] Figure 6 It is a top view of the closing plate in the embodiment of the present application.

[0035] Explanation of reference signs:

[0036] 1 valve body 2 main valve spool

[0037] 3 guide sleeve 4 main valve spring

[0038] 5 piston 6 end cover

[0039] 7 first passage 8 second passage

[0040] 9 accommodating portion 10 third passage

[0041] 11 fourth passage 12 electromagnet assembly

[0042] 13 upper pilot valve top rod 14 lower pilot valve top rod

[0043] 15 first guide spring 16 pilot valve spool

[0044] 17 rubber bowl 18 exhaust casing

[0045] 19 exhaust valve seat 20 closing plate

[0046] 21 flexible gasket 22 compression gasket

[0047] 23 locking member 24 air dispersing hole

[0048] 25 front exhaust valve seat 26 rear exhaust valve seat

[0049] 27 first exhaust hole 28 second exhaust hole DETAILED DESCRIPTION

[0050] The various exemplary embodiments of the present application will now be described in detail, which should not be considered as limiting the present application, but rather as a description of certain aspects, features, and embodiments of the present application.

[0051] Many modifications and variations of the present application described in the specification are possible without departing from the scope or spirit of the present application. Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the present application. The specification and examples are illustrative only.

[0052] The up and down positions of the present application refer to the up and down positions of the electromagnetic valve of the present application when placed in the position as shown in Figure 1 , i.e. the pilot valve is on top and the main valve is on the bottom. The up and down positions should not be confused by adjusting the placement of the product, intentionally misinterpreted or limitedly interpreted, so as to cause the protection scope of the present application to be improperly reduced.

[0053] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, the present invention provides a control solenoid valve for a rocket system, comprising a main valve and a pilot valve.

[0054] The main valve includes a valve body 1, a main valve core 2, a guide sleeve 3, a main valve spring 4, a piston 5, an exhaust valve, and an end cap 6. The valve body 1 has a first channel 7 for gas flow and a second channel 8 that communicates with the first channel 7 but extends in a different direction. The first channel 7 includes a large-diameter portion and a small-diameter portion. The main valve core 2, guide sleeve 3, main valve spring 4, and piston 5 are all located within the large-diameter portion, and the end cap 6 is located at one end of the valve body 1.

[0055] The portion of the valve body 1 radially away from the first channel 7 is provided with a receiving portion 9 and a third channel 10 and a fourth channel 11 connected to the receiving portion 9. The air inlet of the third channel 10 is connected to the air inlet end of the first channel 7, the air outlet of the third channel 10 is connected to the air inlet end of the receiving portion 9, the air outlet end of the receiving portion 9 is connected to the air inlet of the fourth channel 11, and the air outlet of the fourth channel 11 is connected to the air hole on the guide sleeve 3.

[0056] The pilot valve is used to open or close the connection between the third channel 10 and the fourth channel 11.

[0057] The exhaust valve includes an exhaust housing 18 and an exhaust valve seat 19. The exhaust valve seat 19 has an exhaust hole communicating with the first channel 7. The exhaust housing 18 is located on the outside of the valve body 1. The exhaust valve seat 19 is disposed between the main valve core 2 and the piston 5. The outer wall of the exhaust valve seat 19 is tightly fitted and sealed to the inner wall of the first channel 7. There is a gap between the inner wall of the exhaust valve seat 19 and the circumferential outer side of the small diameter portion of the piston 5 so that the gas entering the first channel 7 from the second channel 8 passes through the gap and the exhaust structure in the exhaust valve seat 19 and is discharged to the outside of the valve body 1 through the exhaust housing 18.

[0058] Specifically, the control solenoid valve for a rocket system provided in this embodiment of the invention consists of a main valve and a pilot valve. The exhaust valve includes an exhaust housing 18 and an exhaust valve seat 19. The exhaust valve seat 19 has an exhaust hole communicating with the first channel 7. The exhaust housing 18 is located on the outside of the valve body 1. The exhaust valve seat 19 is disposed between the main valve core 2 and the piston 5. The outer wall of the exhaust valve seat 19 is tightly fitted and sealed to the inner wall of the first channel 7. There is a gap between the inner wall of the exhaust valve seat 19 and the circumferential outer side of the small diameter portion of the piston 5, so that the gas entering the first channel 7 from the second channel 8 passes through the gap and the exhaust structure in the exhaust valve seat 19 and is discharged to the outside of the valve body 1 through the exhaust housing 18.

[0059] The whole electromagnetic valve is provided with the exhaust shell 18 and the exhaust valve seat 19, so that the gas entering the first channel 7 from the second channel 8 is quickly exhausted from the valve body 1, thereby reducing the resistance of the gas to the piston 5, facilitating the piston 5 to quickly push the spool to move, thereby ensuring the safe opening or closing of the electromagnetic valve, improving the reliability of the valve product and the response speed of the electromagnetic valve.

[0060] It should be noted that, in order to facilitate the exhaust of the gas, for example, the exhaust shell 18 is provided with an exhaust passage in communication with the exhaust structure.

[0061] As shown in Figure 1 , Figure 3 , Figure 5 and Figure 6 , downstream of the exhaust passage, the exhaust shell 18 includes a closed end, which includes a closed plate 20, a flexible gasket 21, a compression gasket 22 and a locking member 23. The closed plate 20 includes a central hole and a plurality of gas distribution holes 24 (gas is exhausted from the gas distribution holes) distributed around the central hole, and the circumferential outer surface of the closed plate 20 is connected with the inner wall of the exhaust shell 18. One end of the locking member 23 penetrates the compression gasket 22 and the flexible gasket 21 arranged concentrically in turn and is connected with the threads in the central hole (one end of the locking member contains external threads, and the central hole contains internal threads) to fix the flexible gasket 21 on the closed plate 20. The other end is close to the end face of the side of the compression gasket 22 to make the compression gasket 22 fixed on the flexible gasket 21. In order to facilitate the exhaust of the gas while avoiding the entry of external gas into the valve body 1, for example, the flexible gasket 21 covers the central hole and the gas distribution holes 24.

[0062] In the same embodiment, in order to facilitate the exhaust of the gas, for example, the flexible gasket 21 and the compression gasket 22 are in the shape of a circular plate, and the diameter of the flexible gasket 21 is greater than that of the compression gasket 22. The design of the flexible gasket 21 and the compression gasket 22 in the shape of a circular plate facilitates the uniform stress on the circumferential outer side of the flexible gasket 21, and when the gas is exhausted, the circumferential outer side of the flexible gasket bends away from the valve body to form a gap with the closed plate 20, so that the gas is quickly exhausted from the gap.

[0063] As shown in Figure 4 , in order to facilitate the bending of the flexible gasket 21 (the circumferential outer side deforms under the pressure of the gas, i.e. turns up away from the valve body), for example, the flexible gasket 21 is a rubber gasket. In order to improve the hardness of the compression gasket 22 and effectively fix the flexible gasket 21, for example, the compression gasket 22 is a stainless steel metal gasket.

[0064] In the embodiment, the exhaust valve seat 19 comprises a front exhaust valve seat 25 and a rear exhaust valve seat 26. The front exhaust valve seat 25 is located near one side of the main valve spool 2, and the rear exhaust valve seat 26 is located near one side of the guide sleeve 3. In order to ensure the structural stability of the front exhaust valve seat 25 and the rear exhaust valve seat 26, and facilitate the flow of gas, for example, the front exhaust valve seat 25 is in a cylindrical structure with both ends open, and the outer shape of the rear exhaust valve seat 26 is in a cylindrical structure.

[0065] In addition, the rear exhaust valve seat 26 is provided with an exhaust structure, which comprises a first exhaust hole 27 parallel to the center line of the rear exhaust valve seat 26 and a second exhaust hole 28 radially along the rear exhaust valve seat 26 and in communication with the first exhaust hole 27. The rear exhaust valve seat 26 is circumferentially provided with an annular groove recessed towards the center of the rear exhaust valve seat 26.

[0066] The gas enters the annular groove through the first exhaust hole 27 and the second exhaust hole 28 in turn, and then passes through the exhaust passage of the exhaust shell 18 and is discharged from the valve body 1 through the exhaust hole of the closed end of the exhaust shell 18.

[0067] In order to avoid the exhaust valve moving away from the valve cover in the first passage 7, for example, the outer diameter of the front exhaust valve seat 25 is smaller than the outer diameter of the rear exhaust valve seat 26. Specifically, along the direction from the front exhaust valve seat 25 to the rear exhaust valve seat 26, the transition part of the front exhaust valve seat 25 and the rear exhaust valve seat 26 forms a transition platform, which abuts against the protruding platform of the inner wall of the valve body 1.

[0068] In the embodiment, in order to ensure that the gas quickly enters the first exhaust hole 27 from the front exhaust valve seat 25, for example, the first exhaust hole 27 is arranged on the rear exhaust valve seat 26 and located on the inner side of the rear exhaust valve seat 26 near the front exhaust valve seat 25.

[0069] In addition, in order to make the connection between the front exhaust valve seat 25 and the rear exhaust valve seat 26 more closely and firmly, for example, the front exhaust valve seat 25 and the rear exhaust valve seat 26 are designed in one piece.

[0070] In addition, the pilot valve comprises an electromagnet assembly 12, an upper pilot valve stem 13, a lower pilot valve stem 14, a first guide spring 15 and a pilot valve spool 16. The upper pilot valve stem 13 and the lower pilot valve stem 14 are both located on the inner side of the electromagnet assembly 12, the lower end of the upper pilot valve stem 13 is connected with the upper end of the first guide spring 15, the lower end of the first guide spring 15 is connected with the upper end (in the axial direction of the pilot valve stem 14) of the lower pilot valve stem 14, and the lower end of the lower pilot valve stem 14 is used to connect with the pilot valve spool 16. The pilot valve spool 16 is located in the accommodating portion 9 and moves up and down to open and close the communication between the third passage 10 and the fourth passage 11.

[0071] In the embodiment, the upper pilot valve top rod 13 is formed with a cylindrical space near one end of the lower pilot valve top rod 14, the cylindrical space is provided with a protruding part for hanging the first guide spring 15, one end of the first guide spring 15 is sleeved on the protruding part, and the other end is in abutment with the end of the lower pilot valve top rod 14 near the upper pilot valve top rod 13, and the first guide spring 15 is confined in the cylindrical space defined by the upper pilot valve top rod 13 and the lower pilot valve top rod 15.

[0072] When the pilot valve is opened, the gas medium pushes the piston 5 to move away from the end cover 6 through the third channel 10, the accommodating part 9, the fourth channel 11 and the gas hole (provided on the guide sleeve and located on the limiting table of the fixed main valve spring 4) in sequence through the gas inlet end of the small diameter part, so as to drive the main valve spool 2 to move in the axial direction of the first channel 7, and the one end of the main valve spool 2 is in abutment with the transition part from the large diameter part to the small diameter part, so as to complete the closing of the main valve.

[0073] The electromagnetic valve of the present application sets the first guide spring 15 between the upper pilot valve top rod 13 and the lower pilot valve top rod 14, and the first guide spring 14 can play a buffering role when the upper pilot valve top rod 13 and the lower pilot valve top rod 14 move, avoiding the hard contact between the lower pilot valve top rod 14 and the pilot valve spool 16 in the long-term use process, so as to avoid the damage of each other. The electromagnetic valve of the present application reduces the hard contact between the top rods, ensures the integrity of the lower pilot valve top rod 14 and the pilot valve spool 16, is conducive to the stable sealing performance of the pilot valve spool 16, so as to improve the working performance and reliability of the valve, and prolong the service life of the electromagnetic valve.

[0074] In the same embodiment, in order to reduce the leakage of the gas medium from the transition part from the large diameter part to the small diameter part of the main valve spool 2 and the gap between the main valve spool 2 and the exhaust valve seat 19 when the main valve is opened and closed, for example, the two ends of the main valve spool 2 are respectively provided with a first concave part and a first annular groove which are concave to each other in the axial direction of the first channel 10, and the first concave part and the first annular groove are respectively provided with a first sealing element and a second sealing element which are matched with the shape of the first concave part and the first annular groove.

[0075] In the embodiment, in order to facilitate the fixation of the guide sleeve 3 and the application of pressure by the gas to the main valve spool 2, for example, the guide sleeve 3 is in U-shaped structure. The opening end of the U-shaped structure extends to the side of the main valve spool 2, and the closed end of the U-shaped structure is provided with a gas hole (the gas out of the gas hole applies pressure to the piston to make the piston move to the left, that is, to the inlet side) which is in communication with the fourth channel 11, and the transition part of the inner side wall of the U-shaped structure to the closed end is formed with a limiting table surface.

[0076] In addition, the piston 5 comprises a protruding column and a guide column, which are integrally formed to stabilize the structure of the piston 5. To facilitate the contact between the piston 5 and the main valve spool 2 and the fixation of the main valve spring 4, for example, one end of the protruding column extends to one side of the main valve spool 2, and the other end is connected to one end of the guide column. The other end of the guide column is provided with a second lower recess for fixing one end of the main valve spring 4. One end of the main valve spring 4 is located in the second lower recess, and the other end abuts against the limiting table of the guide sleeve. When the main valve is opened and the pilot valve is closed, the medium at the inlet compresses the spool and the piston to compress the main valve spring, so that the main valve spring can slow down the direct impact of the piston on the table of the guide sleeve. When the main valve is closed and the pilot valve is opened, the gas (gas entering the large diameter part of the first channel through the guide sleeve) together with the main valve spring exerts a force on the piston towards the main valve spool, so that the spool reliably closes the inlet.

[0077] In addition, to prevent gas leakage from the gap between the guide column and the guide sleeve 9, for example, a second annular groove is provided on the guide column along the circumferential outer side of the guide column. The second annular groove is provided with a third sealing element, the inner side of the third sealing element is arranged in the second annular groove, and the outer side of the third sealing element abuts against the inner wall of the guide sleeve.

[0078] To facilitate the installation and disassembly of the pilot valve and the main valve, for example, the pilot valve is fixed to the main valve through a locking nut on the outer side of the main valve, and the axis of the pilot valve is perpendicular to the axis of the main valve. To facilitate the rapid discharge of the gas that pushes the piston 5 to move from the valve body, for example, a cylindrical rubber bowl 17 for exhaust is arranged on the circumferential outer side of one end of the pilot valve close to the locking nut. During exhaust, the gas enters the rubber bowl 17 through the housing of the electromagnet assembly 12 (the housing is provided with a hole communicating with the rubber bowl 17) after passing through the gas outlet of the fourth channel 11, the gas inlet of the fourth channel 11, the inner cavity of the accommodating portion 9, the inner cavity formed by the upper pilot valve top rod 13 and the lower pilot valve top rod 14, and then expands to the sides away from the axis of the rubber bowl 17, thereby discharging the gas. To facilitate the discharge of the gas and prevent external gas from entering the valve body from the rubber bowl 17, for example, the rubber bowl 17 is a barrel body that gradually expands from the center to the two sides.

[0079] In the same embodiment, when the pilot valve spool 16 contacts the bottom of the accommodating portion 9, to buffer the pressure between the two, for example, a limiting table and a second guide spring are arranged on one end of the pilot valve spool 16 away from the lower pilot valve top rod 14. Both the limiting table and the second guide spring are located in the accommodating portion 9, one end of the second guide spring abuts against the bottom of the accommodating portion 9, and the other end abuts against the lower end face of the limiting table.

[0080] In addition, in order to reduce the leakage of gas from the gap between the inner wall of the valve body 1 and the exhaust valve seat 19, for example, a third annular groove and a fourth sealing element matched with the third annular groove are arranged on the part where the inner wall of the valve body 1 and the exhaust valve seat 19 abut. The third annular groove is recessed to the side away from the exhaust valve seat 19, the inner side of the fourth sealing element abuts the outer wall of the exhaust valve seat 19, and the outer side of the fourth sealing element is located in the third annular groove.

[0081] In the embodiment, in order to effectively fix the first guide spring 15, for example, the annular fixing groove for fixing the first guide spring 15 is arranged on the end of the upper guide valve top rod 13 and the lower guide valve top rod 14 close to each other. The annular fixing groove can avoid the radial movement of the two ends of the first guide spring 15, and is beneficial to the first guide spring 15 to apply the elastic force to the upper guide valve top rod 13 and the lower guide valve top rod 14, so that the upper guide valve top rod 13 and the lower guide valve top rod 14 can be quickly responded.

[0082] In addition, the main valve spool 2 adopts a high-pressure impact-resistant composite spool design, and the main valve spool 2 can realize bidirectional sealing with the valve body 1 and the exhaust valve seat 19, which can meet the high-pressure working condition and the repeated motion impact working condition, reduce the structural complexity, and also reduce the product weight.

[0083] The rubber bowl 17 is made of non-metallic material, which simplifies the product structure and reduces the product weight, and meets the design concept of light weight of the rocket engine product.

[0084] The main path medium flow direction (axial direction along the first channel) of the electromagnetic valve of the embodiment is consistent with the main valve spool movement direction, the number of dynamic sealing O-rings (one sealing formed by the cooperation of the third sealing element and the second annular groove on the piston) is reduced, the friction between the piston and the guide sleeve is reduced, the response speed of the valve is faster in the repeated motion process, the downstream propellant control valve is opened and closed in time, and the working reliability of the engine is improved.

[0085] The pilot valve is a pilot electromagnetic valve, the electromagnetic assembly 12 is designed in a universal manner, the electromagnetic assembly 12 and the main valve body are connected in a left and right nut (locking nut) connection mode. In the assembly process, the installation direction of the electromagnetic assembly can be freely rotated, which is convenient for the product to apply various space structures. At the same time, under the condition that the performance of the main valve is good, the electromagnetic assembly can be quickly replaced without affecting the performance of the whole valve. In addition, the electromagnetic assembly 12 is also suitable for use with other product main valves.

[0086] For example, the electromagnetic assembly 12 is connected to the main valve body in a left and right nut (locking nut) connection mode. Figure 1As shown, when the main valve spool 2 back pressure chamber is high pressure gas, the piston 5 pushes the main valve spool 2 to move left, the valve body 1 and the main valve spool 2 realize sealing, the inlet-outlet passage (the first passage inlet, the second passage outlet) is closed; conversely, the main valve spool 2 moves right, the main valve spool 2 and the exhaust valve seat 19 realize sealing, the inlet-outlet passage is opened.

[0087] In addition, when the main valve spool 2 moves left, the valve body 1 and the main valve spool 2 realize sealing, the inlet-outlet passage is closed, the outlet-exhaust port passage (the first passage is communicated through the exhaust port, and the gas is discharged from the first passage through the exhaust port) is opened; conversely, the main valve spool 2 moves right, the main valve spool 2 and the exhaust valve seat 19 realize sealing, the inlet-outlet passage is opened, and the outlet-exhaust port passage is closed.

[0088] As shown, Figure 1 The electromagnetic assembly 12 is powered off, the pilot valve spool 16 moves up under the action of the spring force (the second spring elastic force), the lower valve seat is opened (the lower end surface of the pilot valve 2 is separated from the lower surface of the inner side of the containing part 9, and the upper end surface of the pilot valve spool 16 is attached to the upper surface of the inner side of the containing part 9), and the inlet high pressure gas is communicated with the back pressure chamber of the main valve spool 2 (the part between the piston and the guide sleeve). The electromagnetic iron is powered on, the pilot valve spool moves down, the upper valve seat is opened (the lower end surface of the pilot valve spool 16 is attached to the lower surface of the inner side of the containing part 9, and the upper end surface of the pilot valve spool 16 is separated from the upper surface of the inner side of the containing part 9), and the inlet high pressure gas is cut off to the back pressure chamber of the main valve spool. The gas in the back pressure chamber of the main valve spool passes through the housing of the electromagnetic assembly (the housing is provided with a hole communicating with the rubber bowl 17) into the rubber bowl 17 in sequence through the gas outlet of the fourth passage 11, the gas inlet of the fourth passage 11, the containing 9 cavity, the inner cavity formed by the upper pilot valve top rod and the lower pilot valve top rod, and the rubber bowl 17 is forced to expand away from the axis of the rubber bowl 17, and the gas is discharged.

[0089] The above is only a specific embodiment of the present application, and any equivalent changes and modifications made by any person skilled in the art without departing from the concept and principle of the present application shall belong to the protection scope of the present application.

Claims

1. A control solenoid valve for a rocket system, characterized in that... It includes a main valve and a pilot valve. The main valve includes a valve body, a main valve core, a guide sleeve, a main valve spring, a piston, an exhaust valve, and an end cap. The valve body has a first channel for gas flow and a second channel that communicates with the first channel but extends in a different direction. The first channel includes a large-diameter portion and a small-diameter portion. The main valve core, the guide sleeve, the main valve spring, the exhaust valve, and the piston are all located in the large-diameter portion. The end cap is located at one end of the valve body. The valve body is provided with a receiving portion and a third and fourth channel connected to the receiving portion in the radial direction away from the first channel; the air inlet of the third channel is connected to the air inlet end of the first channel located in the small diameter portion, the air outlet of the third channel is connected to the air inlet end of the receiving portion, the air outlet end of the receiving portion is connected to the air inlet of the fourth channel, and the air outlet of the fourth channel is connected to the air hole on the guide sleeve. The pilot valve is used to open or close the connection between the third channel and the fourth channel; The exhaust valve includes an exhaust housing and an exhaust valve seat. The exhaust valve seat has an exhaust hole communicating with the first channel. The exhaust housing is located on the outside of the valve body. The exhaust valve seat is disposed between the main valve core and the piston. The outer wall of the exhaust valve seat is tightly fitted and sealed to the inner wall of the first channel. There is a gap between the inner wall of the exhaust valve seat and the circumferential outer side of the small diameter portion of the piston so that the gas entering the first channel from the second channel passes through the gap and the exhaust structure in the exhaust valve seat and is discharged to the outside of the valve body through the exhaust housing. The exhaust valve seat includes a front valve seat and a rear valve seat; the front valve seat is located on the side closer to the main valve core, and the rear valve seat is located on the side closer to the guide sleeve; the front valve seat is a cylindrical structure with both ends connected, and the rear valve seat is a cylindrical structure. The rear valve seat is provided with the exhaust structure, which includes a first exhaust hole parallel to the centerline of the rear valve seat and a second exhaust hole radially connected to the first exhaust hole; the rear valve seat is provided with an annular groove recessed towards the center of the rear valve seat. After the gas passes through the first exhaust port and the second exhaust port in sequence into the annular groove, it passes through the exhaust channel of the exhaust housing and is discharged from the valve body through the exhaust port at the closed end of the exhaust housing.

2. The control solenoid valve for a rocket system according to claim 1, characterized in that... The exhaust housing is provided with an exhaust channel that communicates with the exhaust structure.

3. The control solenoid valve for a rocket system according to claim 2, characterized in that... Downstream of the exhaust channel, the exhaust housing includes a closed end, which comprises a sealing plate, a flexible gasket, a clamping gasket, and a locking member. The sealing plate includes a central hole and venting holes distributed around the central hole. The outer circumferential surface of the sealing plate is connected to the inner wall of the exhaust housing. One end of the locking member passes through the concentrically arranged clamping gasket and the flexible gasket in sequence and is threaded to the central hole to fix the flexible gasket on the sealing plate. The other end of the locking member has its end face close to the clamping gasket and is in close contact with the clamping gasket to fix the clamping gasket on the flexible gasket. The flexible gasket covers the central hole and the venting holes.

4. The control solenoid valve for a rocket system according to claim 3, characterized in that... The flexible gasket and the pressing gasket are both circular in shape, and the diameter of the flexible gasket is larger than the diameter of the pressing gasket.

5. The control solenoid valve for a rocket system according to claim 3, characterized in that... The flexible gasket is a rubber gasket, and the compression gasket is a stainless steel metal gasket.

6. The control solenoid valve for a rocket system according to claim 1, characterized in that... The outer diameter of the front valve seat is smaller than the outer diameter of the rear valve seat. Along the direction from the front valve seat to the rear valve seat, the transition area between the front valve seat and the rear valve seat forms a transition platform, which abuts against the protruding platform on the inner wall of the valve body.

7. The control solenoid valve for a rocket system according to claim 1, characterized in that... The first exhaust port is disposed on the rear valve seat and is located on the inner side of the rear valve seat near the end of the front valve seat.

8. The control solenoid valve for a rocket system according to claim 1, characterized in that... The front valve seat and the rear valve seat are designed as a single piece.

9. The control solenoid valve for a rocket system according to claim 1, characterized in that... The pilot valve includes an electromagnet assembly, an upper pilot valve rod, a lower pilot valve rod, a first guide spring, and a pilot valve core. Both the upper and lower pilot valve rods are located inside the electromagnet assembly. The lower end of the upper pilot valve rod is connected to the upper end of the first guide spring, and the lower end of the first guide spring is connected to the upper end of the lower pilot valve rod. The lower end of the lower pilot valve rod is used to connect to the pilot valve core. The pilot valve core is located within the receiving portion. The up-and-down movement of the pilot valve core is controlled by the on / off state of the electromagnet assembly to open or close the third and fourth channels. When the pilot valve is opened, the gas medium passes through the inlet end of the small-diameter portion in sequence through the third channel, the receiving portion, the fourth channel, and the air hole, pushing the piston to move away from the end cover. This causes the main valve core to move along the axial direction of the first channel, so that one end of the main valve core abuts against the transition part from the large-diameter portion to the small-diameter portion, thereby completing the closure of the main valve.

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