Propellant charge and vent valve

Abstract

The present application belongs to the field of spacecraft, and provides a propellant filling and discharging valve, comprising: a valve seat with a moving cavity; a valve core movably sleeved in the moving cavity, with a blind hole at one end, a plurality of through holes in the middle part, and an end head at the other end; a connecting plug connected with the inlet of the moving cavity and provided with a flow channel; an elastic member arranged in the moving cavity, connected with the plug at one end and connected with the valve core at the other end; and a detection device arranged in the moving cavity for detecting the position of the valve core and discharging static electricity; wherein the elastic member is in an extended state, and the end head seals the outlet of the moving cavity together with the valve seat. When filling, only the sealing cooperation between the valve seat and the valve core is released, so that the filling device is completely conducted, and filling is realized. The operation is simple, and rapid filling is realized. Through the detection device, the position of the valve core can be detected before the filling and discharging valve is filled, so that the valve core can be moved to the right position, and the detection device can be used for static electricity discharge of the filling and discharging valve, thereby improving the operation safety.

Description

Technical Field

[0001] This invention belongs to the field of spacecraft, and in particular relates to a propellant loading and unloading valve. Background Technology

[0002] In liquid attitude and orbit control power systems, the filling and discharging of liquid fuel is a crucial step, and valves, as the core of filling and discharging, have always been a research hotspot.

[0003] Traditional valves are designed with a double-redundant sealing structure. When filling or discharging pressure vessels, the medium can flow by opening both sealing points, and after filling, the sealing points can be closed to keep the pressure vessel sealed. This redundant sealing structure is not only relatively large and heavy, but also cumbersome to operate, and is not conducive to the rapid refueling of existing liquid attitude control systems.

[0004] In addition, existing valve cores and other components are installed inside the housing formed by the valve body and the connecting nozzle. The connection between the valve body and the connecting nozzle is usually a leakage channel. To ensure sealing, welding is usually required, which involves many procedures, high costs, and increases the risk of leakage.

[0005] Furthermore, it is impossible to detect whether the valve core has been pushed back into place during the process of being pushed back. More importantly, the valve is sensitive to static electricity. Once static electricity is present, it will cause great safety hazards. Therefore, the operation of discharging static electricity from the valve is particularly important.

[0006] Therefore, there is an urgent need for a valve that is easy to operate, has a low risk of leakage, is detectable in status, and can easily discharge static electricity to solve the above problems. Summary of the Invention

[0007] This invention provides a propellant loading and unloading valve for use in a liquid orbital attitude control power system, aiming to solve the problems of existing loading and unloading valves, such as complex operation, easy leakage, inability to know the movement state of the valve core, and safety hazards caused by static electricity.

[0008] In a first aspect, the present invention provides a propellant filling and discharging valve, comprising:

[0009] A valve seat with a moving chamber is inserted;

[0010] The valve core is movably fitted into the moving cavity, with a blind hole at one end, several flow holes in the middle, and a valve core with an end cap at the other end.

[0011] A connector plug is connected to the inlet of the motion cavity and has a flow channel.

[0012] An elastic element disposed within the moving cavity, one end connected to the connector plug and the other end connected to the valve core; and

[0013] A detection device located inside the moving cavity for detecting the position of the valve core and discharging static electricity;

[0014] When the elastic element is in the extended state, the end seals the outlet of the motion cavity.

[0015] Optionally, the detection device includes:

[0016] A switch assembly fixedly embedded in the inner wall of the middle part of the motion cavity; and

[0017] A drive assembly that is movable and passes through the inner wall of the middle of the motion cavity;

[0018] The drive component can trigger the switching component under the drive of the valve core.

[0019] Optionally, the switching assembly includes:

[0020] The shell cover is fixedly embedded in the inner wall of the middle part of the motion cavity; and

[0021] Two electrostatic plates facing the interior of the motion cavity and fixed to the shell cover at intervals by electrode posts; the electrode posts are connected to wires.

[0022] The driving component includes:

[0023] One end of the rod has a movable plate facing the electrostatic plate, and the other end of the rod partially extends into the motion cavity; and

[0024] A return spring, with one end fixed to the inner wall of the middle part of the motion cavity and the other end connected to the drive rod;

[0025] The kinetic electrode can simultaneously contact and conduct electricity with two electrostatic electrodes to trigger the switching assembly and discharge static electricity.

[0026] Optionally, the electrostatic sheet is bent at one end toward the kinetic sheet to form a contact portion.

[0027] Optionally, the material of the shell cover and the drive rod is polytetrafluoroethylene;

[0028] The electrostatic sheet and the kinetic sheet are made of beryllium bronze;

[0029] The electrode post is made of aluminum.

[0030] Optionally, the outlet of the motion cavity is also covered with a protective cap.

[0031] Optionally, a filter body is also provided at the connection between the elastic element and the valve core.

[0032] Optionally, the mesh size of the filter element ranges from 80 to 100.

[0033] Optionally, the end of the valve seat that seals with the end head is provided with an inwardly extending step;

[0034] The inner diameter of the step is equal to the diameter of the end.

[0035] Optionally, at least one seal is provided around the periphery of the end.

[0036] The propellant filling and discharging valve provided by this invention is used in a liquid orbital attitude control power system. During filling, only an external force needs to be applied to the valve seat to disengage the valve seat from the valve core, pushing the valve core into the valve seat and enabling the entire filling device to conduct, thus achieving filling. When filling is finished, only the external force applied to the valve core needs to be removed. Under the action of the elastic element, the valve core rebounds, allowing the valve seat and valve core to return to their mating state, sealing the valve seat. The operation is simple, time-saving, and achieves rapid filling. Operators can avoid prolonged exposure to toxic and harmful environments. A detection device can be used to detect the position of the valve core before filling, checking its movement flexibility to ensure the valve core can move into position. Simultaneously, the detection device can be used to discharge static electricity from the filling and discharging valve, improving operational safety. Attached Figure Description

[0037] Figure 1 This is a cross-sectional schematic diagram of the propellant filling and discharging valve provided by the present invention in the extended state of the elastic element;

[0038] Figure 2 This is a cross-sectional schematic diagram of the propellant filling and discharging valve provided by the present invention when the elastic element is in a compressed state;

[0039] Figure 3 yes Figure 1 A magnified view of a portion of point III;

[0040] Figure 4 yes Figure 2 A magnified view of a portion of point IV in the middle;

[0041] Figure 5 This is a three-dimensional schematic diagram of the valve core of the propellant filling and discharging valve provided by the present invention;

[0042] Figure 6 This is another three-dimensional schematic diagram of the valve core of the propellant filling and discharging valve provided by the present invention;

[0043] Figure 7 This is a three-dimensional schematic diagram of the detection device for the propellant filling and discharging valve provided by the present invention;

[0044] Figure 8 This is a three-dimensional schematic diagram of the drive assembly of the propellant filling and discharging valve provided by the present invention;

[0045] Figure 9This is a three-dimensional schematic diagram of the switching assembly of the propellant filling and discharging valve provided by the present invention;

[0046] Figure 10 This is a three-dimensional schematic diagram of the electrode post and electrostatic sheet of the propellant filling and discharging valve provided by the present invention.

[0047] Explanation of key component symbols:

[0048] 100. Valve seat; 120. Moving chamber; 140. Step; 160. Strip wire groove; 200. Valve core; 210. Main body section; 230. Connecting section; 250. Extension section; 220. Blind hole; 222. Guide hole; 240. Flow hole; 260. End; 262. Load-bearing groove; 264. Vent hole; 300. Connecting plug; 400. Elastic element; 500. Detection device; 520 522. Switch assembly; 5222. Housing cover; 5222. Groove; 524. Electrode post; 5242. Terminal; 5244. Post; 526. Electrostatic sheet; 5262. Contact part; 540. Drive assembly; 542. Moving electric sheet; 544. Drive rod; 5442. Contact section; 5444. Rod body; 546. Return spring; 600. Protective cap; 700. Filter body; 800. Seal. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the invention, and should not be construed as limiting the invention. Furthermore, it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0050] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "left", "right", "horizontal", "top", "bottom", 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.

[0051] 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 one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0052] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; 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. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0053] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0054] The following disclosure provides numerous different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0055] The propellant filling and discharging valve provided by this invention is used in a liquid orbital attitude control power system. During filling, only an external force needs to be applied to the valve seat to disengage the valve seat from the valve core, pushing the valve core into the valve seat and enabling the entire filling device to conduct, thus achieving filling. When filling is finished, only the external force applied to the valve core needs to be removed. Under the action of the elastic element, the valve core rebounds, allowing the valve seat and valve core to return to their mating state, sealing the valve seat. The operation is simple, time-saving, and achieves rapid filling. Operators can avoid prolonged exposure to toxic and harmful environments. A detection device can be used to detect the position of the valve core before filling, checking its movement flexibility to ensure the valve core can move into position. Simultaneously, the detection device can be used to discharge static electricity from the filling and discharging valve, improving operational safety.

[0056] Example 1

[0057] Please see Figures 1 to 4 This embodiment provides a propellant injection / discharge valve for a liquid orbital attitude control propulsion system, comprising:

[0058] A valve seat 100 with a moving cavity 120 is inserted;

[0059] A valve core 200 is movably sleeved inside the moving cavity 120, with a blind hole 220 at one end, several flow holes 240 in the middle, and an end head 260 at the other end.

[0060] A connector plug 300 is connected to the inlet of the motion cavity 120 and has a flow channel.

[0061] An elastic element 400, located within the motion chamber 120, is connected at one end to the connector 300 and at the other end to the valve core 200; and

[0062] A detection device 500 is installed inside the motion chamber 120 to detect the position of the valve core 200 and to discharge static electricity;

[0063] When the elastic element 400 is in the extended state, the end 260 seals the outlet of the motion cavity 120.

[0064] The propellant loading and unloading valve provided in this embodiment is used for loading and unloading propellant into a liquid orbital attitude control propulsion system. Specifically, the propellant is usually in a liquid state. When loading is required, the propellant is stored in a container. The liquid orbital attitude control propulsion system includes a storage tank for receiving the propellant. The loading and unloading valve connects both the propellant container and the storage tank, allowing the propellant to flow from the container through the loading and unloading valve into the storage tank. Similarly, when unloading is required, the operation is reversed, allowing the propellant to flow from the storage tank through the loading and unloading valve into the container.

[0065] In this embodiment, the valve seat 100 can be configured as a cylindrical structure, which includes an outer wall with a certain thickness to provide sufficient strength and provide thermal insulation. The moving cavity 120 extends through the interior of the cylindrical structure along its length, allowing propellant liquid to pass through the filling and discharging valves during the filling process. Similarly, during the discharging process, the propellant liquid can pass through the filling and discharging valves in the opposite direction.

[0066] In this embodiment, the flow direction of the propellant liquid during refueling is taken as the reference direction. Based on this, the inlet of the motion chamber 120 refers to the opening at one end of the motion chamber 120 where the propellant liquid flows in, which is also the inlet of the valve seat 100; similarly, the outlet of the motion chamber 120 refers to the opening at one end of the motion chamber 120 where the propellant liquid flows out, which is also the outlet of the valve seat 100.

[0067] The valve core 200 is movably sleeved within the valve seat 100. Specifically, the valve core 200 is disposed within the moving cavity 120 and can move along its length within the moving cavity 120. It can be understood that the length of the valve core 200 is significantly smaller than that of the moving cavity 120, so that the entire valve core 200 remains within the moving cavity 120 during its movement.

[0068] The valve core 200 can be configured as a stepped cylindrical structure, specifically composed of a main body section 210, a connecting section 230, and an extension section 250. Within the motion chamber 120, the main body section 210 faces the inlet, the extension section 250 faces the outlet, and the connecting section 230 is located in the middle, with one end connected to the main body section 210 and the other end connected to the extension section 250. The main body section 210 has a blind hole 220 that penetrates both the main body section 210 and the connecting section 230, thus connecting them. The connecting section 230 has several evenly distributed flow holes 240, which can penetrate the sidewall of the connecting section 230. These flow holes 240 connect the blind hole 220 to the outside, meaning they primarily facilitate the transfer of fluid between the blind hole 220 and the fluid medium outside the blind hole 220. In addition, a number of evenly distributed flow holes 240 can be provided on one end face of the main body section 210 that is approximately perpendicular to the connecting section 230, thereby improving the flow performance. The extension section 250 can be a solid cylinder with an end 260 at the end that is not connected to the connecting section 230.

[0069] The diameters and lengths of the main body section 210, connecting section 230, and extension section 250 are different, resulting in the valve core 200 having a stepped cylindrical shape. Specifically, the diameter and length of the main body section 210 are larger than those of the connecting section 230 and the extension section 250, allowing for a larger volume of the blind orifice 220 and thus increasing the flow rate during propellant injection and discharge. Since the extension section 250 is a solid structure with a smaller diameter and length, it provides sufficient strength while reducing weight, improving the smoothness of valve core 200 movement, and reducing material usage and cost savings. The diameter and length of the connecting section 230 are significantly smaller than those of the main body section 210 and the extension section 250, causing the inner diameter of the portion of the blind orifice 220 within the connecting section 230 to be smaller than that within the main body section 210, resulting in the blind orifice 220 having a stepped orifice structure.

[0070] End 260 is located at the free end of extension 250 that is not connected to connecting section 230. The diameter of end 260 is equal to the inner diameter of the outlet of motion chamber 120, so that end 260 can seal the outlet of motion chamber 120 when it reaches it. The diameter of end 260 can be set slightly smaller than that of main body section 210, making the overall shape of valve core 200 more regular and facilitating its adaptation to valve seat 100. A bearing groove 262 can also be provided on one end face of end 260 facing the outlet of motion chamber 120. The bottom surface of bearing groove 262 can be used as a bearing surface for tooling to facilitate the movement of valve core 200. A vent hole 264 can also be provided on blind hole 220 to release high-pressure gas in the filling fluid during long-term filling.

[0071] A connector 300 is placed at the inlet of the motion chamber 120. A flow channel runs along its length inside the connector 300, communicating with the motion chamber 120. This allows propellant liquid to enter the inlet of the motion chamber 120 through the connector 300 during filling and discharging. One end of an elastic element 400 is fixedly connected to the end of the connector 300 facing the interior of the motion chamber 120, and the other end is connected to a blind hole 220 on the valve core 200. Specifically, the connector 300 may have a receiving hole, and the sidewall of the blind hole 220 of the valve core 200 may extend a certain distance to form a guide hole 222. One end of the elastic element 400 is disposed within the receiving hole, and the other end is disposed within the guide hole 222. The end of the elastic element 400 connected to the connector 300 can be considered a fixed fulcrum. When the valve core 200 moves, it causes the other end of the elastic element 400 to approach this fulcrum, thereby causing the elastic element 400 to enter a compressed state and accumulate elastic force.

[0072] When the elastic element 400 is in the extended state, the total length of the elastic element 400 and the valve core 200 is approximately equal to the total length of the moving chamber 120. This allows the end 260 to be positioned precisely at the outlet of the moving chamber 120, thereby sealing the outlet of the moving chamber 120. The elastic element 400 can specifically be a spring.

[0073] The detection device 500 is located inside the motion chamber 120, specifically on the movement trajectory of the valve core 200. Thus, when the valve core 200 passes by, the detection device 500 can detect and obtain the position of the valve core 200. The valve core 200 also generates static electricity during its movement. The detection device 500 can absorb and discharge this static electricity while detecting its position, thereby eliminating potential safety hazards caused by static electricity.

[0074] The working principle of the propulsion and discharge valve provided by this invention is as follows: Please refer to... Figure 1 , 3During refueling, the port of connector 300 is connected to the propellant container, and the outlet of motion chamber 120 is connected to the storage tank of the liquid orbital attitude control power system. An external force is applied to the end 260 of valve core 200, pushing it into valve seat 100 and allowing it to move further within motion chamber 120. Simultaneously, elastic element 400 is compressed and accumulates elastic force. At this time, the outlet of motion chamber 120 is opened, and the blind hole 220 of valve core 200 connects to the outlet of motion chamber 120 through flow hole 240. Propellant can enter the inlet of motion chamber 120 through the port of connector 300, flow through blind hole 220 and flow hole 240, and finally flow out from the outlet of motion chamber 120, thus completing the refueling process. When refueling is finished, the external force applied to the valve core 200 is removed. The elastic element 400 releases the stored elastic force, causing the valve core 200 to rebound. The valve core 200 moves in the opposite direction until the end 260 reaches the outlet of the motion chamber 120. At this time, the elastic element 400 returns to its extended state, and the end 260 is positioned exactly at the outlet of the motion chamber 120 and seals with the valve seat 100, sealing the outlet of the motion chamber 120. The flow hole 240 of the valve core 200 is isolated from the outside, and the propellant in the container cannot flow out.

[0075] Please see Figure 2 , 4 When discharging, it is only necessary to reverse the flow direction of the propellant, which will not be elaborated here.

[0076] The propellant filling and discharging valve provided by this invention is used in a liquid orbital attitude control power system. During filling, only an external force needs to be applied to the valve seat 100 to disengage the valve seat 100 from the valve core 200, pushing the valve core 200 into the valve seat 100, thus enabling the entire filling device to conduct and achieve filling. When filling is finished, only the external force applied to the valve core 200 needs to be removed. Under the action of the elastic element 400, the valve core 200 rebounds, allowing the valve seat 100 and valve core 200 to return to their mating state, sealing the valve seat 100. The operation is simple, quick, and achieves rapid filling, avoiding prolonged exposure of operators to toxic and harmful environments. The detection device 500 can detect the position of the valve core 200 before filling, checking its movement flexibility to ensure it can move into position. Simultaneously, the detection device 500 can be used to discharge static electricity from the filling and discharging valve, improving operational safety.

[0077] Example 2

[0078] Please see Figures 1 to 4 The detection device 500 in this embodiment includes:

[0079] The switch assembly 520 is fixedly embedded in the inner wall of the middle part of the motion cavity 120; and

[0080] A drive assembly 540 is installed in the middle of the inner wall of the motion cavity 120;

[0081] The drive assembly 540 can trigger the switch assembly 520 under the drive of the valve core 200.

[0082] During propellant loading and unloading operations, the valve core 200 needs to be pushed into the moving chamber 120 of the valve seat 100 and moved to the effective position to allow the flow hole 240 to fully connect the blind hole 220 with its external surroundings, thereby enabling the transfer of propellant between the blind hole 220 and the outside of the blind hole 220. Otherwise, if the loading and unloading operation is performed when the valve core 200 is in a faulty state and cannot move to the effective position, the propellant may become blocked in the valve seat and unable to flow. In severe cases, excessive hydraulic pressure may cause the loading and unloading valve to burst and be damaged, resulting in an accident and endangering the lives of the operators. However, since the valve core 200 is located inside the valve seat 100, its position during movement cannot be determined by visual observation. That is, during the preparation stage before loading and unloading, it is impossible to confirm whether the loading and unloading valve is in a normal and fault-free working state.

[0083] In this embodiment, the detection device 500 can be used to check the movement of the valve core 200 in the valve seat 100 before adding or draining, and to confirm whether the valve core 200 can reliably move to the effective position, thereby ensuring that the adding or draining valve is in a normal and fault-free working state and ensuring the safety of the operator.

[0084] Specifically, the detection device 500 includes a fixedly mounted switch assembly 520 and a movable drive assembly 540. When the valve core 200 moves to the effective position, it can drive the drive assembly 540 to move and trigger the switch assembly 520. The switch assembly 520 can be fixedly installed on the inner wall of the middle part of the motion cavity 120. Correspondingly, the inner wall of the motion cavity 120 can be provided with a mounting hole, which can be arranged radially along the motion cavity 120. The switch assembly 520 is entirely embedded in the mounting hole and spaced a certain distance from the inner wall. The drive assembly 540 can also pass through the mounting hole. Unlike the switch assembly 520, a portion of the drive assembly 540 can extend out of the mounting hole, that is, the extended portion extends beyond the inner wall and enters the motion cavity 120. When not subjected to external force, the drive assembly 540 and the switch assembly 520 do not contact each other and are separated by a certain distance.

[0085] During the preparation stage before adding or discharging, an external force can be applied to the valve core 200, pushing it into the moving chamber 120. When the valve core 200 moves to contact the portion of the drive assembly 540 that extends beyond the inner wall, the drive assembly 540 can be pushed back into the mounting hole until it contacts the switch assembly 520. Contact between the drive assembly 540 and the switch assembly 520 triggers the switch assembly 520, indicating that the valve core 200 has moved to its effective position, meaning the adding / discharging valve is in a normal, trouble-free operating state.

[0086] It is understood that in this embodiment, the "effective position" refers to the position or range of the valve core 200 when the flow hole 240 fully connects the blind hole 220 to its outside. The inner wall of the middle part of the motion cavity 120 where the switch assembly 520 and the drive assembly 540 are located is in the effective position.

[0087] The propellant loading and unloading valve provided by this invention allows for the use of a detection device 500 to check the working status of the valve during the preparation stage before loading and unloading. Moving the valve core 200 within the motion chamber 120 triggers the drive assembly 540 to activate the switch assembly 520, indicating that the valve core 200 has disengaged from the sealed position and been pushed into place to open the outlet of the valve seat 100. If the drive assembly 540 fails to activate the switch assembly 520, it indicates that the valve core 200 has not been pushed into place, and the working status of the loading and unloading valve is poor. The device offers high detection accuracy, a simple structure, and strong stability.

[0088] Example 3

[0089] Please see Figures 3 to 10 The switching assembly 520 in this embodiment includes:

[0090] The cover 522 is fixedly embedded in the inner wall of the middle part of the motion cavity 120; and

[0091] Two electrostatic plates 526 facing the inside of the motion cavity 120 and fixed to the shell cover 522 at intervals by electrode posts 524; the electrode posts 524 are connected to wires.

[0092] Driver component 540 includes:

[0093] One end of the rod is a movable plate 542 facing the electrostatic plate 526, and the other end of the rod partially extends into the motion cavity 120; and

[0094] A return spring 546, with one end fixed to the inner wall of the middle part of the motion cavity 120 and the other end connected to the drive rod 544;

[0095] Among them, the kinetic contact 542 can simultaneously contact and conduct electricity with two electrostatic contact 526 to trigger the switch assembly 520 and discharge static electricity.

[0096] In this embodiment, the drive assembly 540 consists of a drive rod 544, a return spring 546, and a movable electric plate 542. The drive rod 544 can be composed of a contact section 5442 and a rod body 5444. The contact section 5442 is located at one end of the rod body 5444, and its end face can be rounded to facilitate smooth contact with the valve core 200. The movable electric plate 542 is located at the other end of the rod body 5444. Specifically, this end of the rod body 5444 can be threaded, and correspondingly, the movable electric plate 542 is also threaded, and the movable electric plate 542 is threadedly connected to the rod body 5444. The return spring 546 is nested in the rod body 5444. When the drive assembly 540 is installed in the mounting hole on the inner wall of the valve seat 100, one end of the return spring 546 is fixedly connected to the mounting hole, and the other end abuts against the movable electric plate 542. When the valve core 200 is pushed back into the motion chamber 120 and reaches the effective position, the farthest point of one end of the valve core 200 contacts the rounded corner of the contact section 5442 end face of the drive rod 544, pushing the drive rod 544 back into the mounting hole, causing the movable piece 542 to contact the switch assembly 520, triggering the switch assembly 520. At this time, the return spring 546 is in a compressed state and accumulates elastic restoring force. When the valve core 200 is no longer under force and returns to the sealed state, the valve core 200 and the drive rod 544 are no longer in contact. The return spring 546 releases the elastic restoring force, pushing the drive rod 544 to move, causing the movable piece 542 to move away from the switch assembly 520. At this time, the switch assembly 520 is disconnected.

[0097] The switch assembly 520 consists of an electrostatic sheet 526, an electrode post 524, and a housing 522. The electrode post 524 can be composed of a terminal 5242 and a post body 5244. The terminal 5242 is located at one end of the post body 5244, and a limiting part is located at the other end of the post body 5244. The electrostatic sheet 526 has a through groove, and the electrode post 524 passes through both the through groove of the electrostatic sheet 526 and the mounting hole of the housing 522, thereby fixing the electrostatic sheet 526 to the middle of the housing 522. During assembly, because the diameter of the limiting part is larger than the through groove, it cannot pass through the through groove, thus hooking the electrostatic sheet 526 and preventing it from falling off. The terminal 5242 passes through the housing 522, allowing it to connect to external wires. The cover 522 has a groove 5222 in the middle for accommodating and protecting the electrostatic sheet 526. The bottom of the groove 5222 has two mounting holes spaced a certain distance apart for the electrode post 524 to fix the two electrostatic sheets 526 to the cover 522. The mounting holes can be threaded holes, and the electrode post 524 is threaded accordingly. The two are fixed by threaded connection. Specifically, wires can be soldered onto the terminal 5242, and a strip wire groove 160 can be provided on the outer wall of the valve seat 100. The wires are led out from the strip wire groove 160 of the valve seat 100 and the wires and switch assembly 520 are potted with high-pressure resistant sealant. When the drive assembly 540 is pushed back into the mounting hole of the valve seat 100 by the valve core 200, the moving piece 542 contacts the two spaced electrostatic pieces 526 at the same time, so that the two electrode posts 524 form one path of the detection device 500. At this time, the detection device 500 is in the conducting state. When the valve core 200 no longer pushes the drive assembly 540, the return spring 546 of the drive assembly 540 pushes the drive rod 544 back into the valve seat 100. At this time, the moving piece 542 is out of contact with the two separate electrostatic pieces 526, and the detection device 500 is in the disconnected state.

[0098] In the preparation stage before the discharge, an external force can be applied to the valve core 200, pushing it into the moving chamber 120. The external force is then removed, causing the valve core 200 to rebound. Static electricity is generated during the movement of the valve core 200. When the valve core 200 is pushed to the effective position, the moving electrode 542 contacts the electrostatic electrode 526, making the circuit formed by the two electrode posts 524 conductive. The static electricity can be used as a signal source to transmit the detection result, and simultaneously output through the wire, thus synchronously achieving static discharge.

[0099] The propellant loading and unloading valve provided by this invention allows the valve core 200 to move, driving the kinetic electrode 542 to simultaneously contact the two electrostatic electrodes 526, thus completing the circuit and triggering the switching assembly 520. The signal is transmitted through the wire connected to the electrode post 524 to detect the position of the valve core 200. By using the static electricity generated when the valve core 200 moves as a detection signal source, static discharge can be completed simultaneously with detection, greatly reducing safety hazards.

[0100] Example 4

[0101] Please see Figure 10 In this embodiment, the electrostatic sheet 526 is bent at one end toward the kinetic sheet 542 to form a contact portion 5262.

[0102] In this embodiment, the contact portion 5262 can be a "U"-shaped structure formed by bending one end of the electrostatic sheet 526 toward the moving electric sheet 542. In each electrostatic sheet 526, one straight edge of the "U"-shaped structure is attached to the bottom end face of the groove 5222 of the cover 522, and the other straight edge is spaced a certain distance from the bottom end face of the groove 5222 to be close to the moving electric sheet 542. The "U"-shaped structures on the two electrostatic sheets 526 are arranged in parallel. By setting the contact portion 5262 as a "U"-shaped structure, it can be closer to the moving electric sheet 542, thereby facilitating the triggering of the switch assembly 520. In addition, the contact area between the electrostatic sheet 526 and the moving electric sheet 542 is reduced, so that the two can achieve conduction in a small space while the contact is more precise, improving the accuracy of detection.

[0103] It is understood that in some embodiments, the contact portion 5262 of the electrostatic sheet 526 may also be configured in other shapes, which are not specifically limited here.

[0104] The propellant filling and discharging valve provided by the present invention has an electrostatic plate 526 that contacts the moving plate 542 through a contact portion 5262 formed by bending, which improves the contact performance and enables the switching assembly 520 to be triggered stably, thus ensuring the accuracy of detection.

[0105] Example 5

[0106] Please see Figures 8 to 10 In this embodiment, the shell cover 522 and the drive rod 544 are made of polytetrafluoroethylene;

[0107] The materials for electrostatic sheet 526 and kinetic sheet 542 are beryllium bronze;

[0108] The electrode post 524 is made of aluminum.

[0109] The propellant filling and discharging valve provided by this invention has a housing 522 and a drive rod 544 made of polytetrafluoroethylene (PTFE), which provides excellent insulation properties. The electrostatic plate 526 and the kinetic plate 542 are made of beryllium bronze, providing excellent conductivity and enabling conduction even when electrostatic signals are used as a signal source, ensuring detection even with weak signals. The electrode post 524 is made of aluminum, which offers good conductivity and is inexpensive, thus saving costs.

[0110] Example 6

[0111] Please see Figure 1In this embodiment, the outlet of the motion cavity 120 is also covered with a protective cap 600.

[0112] In this embodiment, a protective cap 600 is placed over the outlet of the moving chamber 120 of the valve core 200 and seals the outlet to protect the overall structure of the filling and draining valve. The protective cap 600 can be removed when filling and draining liquid. It is easy to understand that the protective cap 600 is detachably connected to the valve seat 100. Specifically, the inner wall of the protective cap 600 may be threaded, and correspondingly, the outer wall of the valve seat 100 may also be threaded, with the two connected through threaded engagement.

[0113] A sealing element 800 can also be provided on the outer wall of the valve core 200 to improve the sealing performance between the valve core 200 and the protective cap 600. The sealing element 800 can be a perfluoroether O-ring.

[0114] The propellant filling and discharging valve provided by the present invention can protect the overall structure of the valve by a protective cap 600 covering the outlet of the moving chamber 120; the liquid can be filled and discharged by removing the protective cap 600, which is simple to operate and highly efficient.

[0115] Example 7

[0116] Please see Figure 1 , 2 In this embodiment, a filter body 700 is also provided at the connection between the elastic element 400 and the valve core 200.

[0117] In this embodiment, the sidewall of the filter body 700 may be threaded, and correspondingly, the inner wall of the guide hole 222 of the valve core 200 may also be threaded. The filter body 700 is fixed to the guide hole 222 of the valve core 200 by threaded connection for filtering the injected liquid. The filter body 700 is provided with a plurality of filter holes. Preferably, in some embodiments, the mesh size of the filter body 700 is in the range of 80 to 100.

[0118] The filler fluid can be filtered by setting the filter body 700 to prevent impurities from accumulating in the valve core 200 during long-term use and affecting the filling process.

[0119] The propellant filling and discharging valve provided by the present invention filters the filling liquid through a filter body 700 provided at the connection between the elastic element 400 and the valve core 200, removes impurities, reduces the workload of cleaning and disassembling the inside of the filling and discharging valve, and further improves efficiency.

[0120] Example 8

[0121] Please see Figure 1 , 2 In this embodiment, the valve seat 100 and the end 260 are sealed together with an inwardly extending step 140.

[0122] The inner diameter of step 140 is equal to the diameter of end 260.

[0123] In this embodiment, the moving cavity 120 of the valve seat 100 may include two sections with different inner diameters. Specifically, the middle section has a larger inner diameter and a longer length, occupying most of the moving cavity 120; the inner diameter of the end that seals with the end 260 is tightened and extends inward to form a step 140, the length of which is much smaller than that of the middle section.

[0124] The inner diameter of step 140 is equal to the diameter of end 260, so that when the outer wall of end 260 reaches the position where it contacts the inner wall of step 140, the two can form a sealed fit.

[0125] The filling and draining valve provided by this invention applies an external force to the end 260 during filling and draining, causing the valve core 200 to be pushed into the valve seat 100, which fully opens the outlet of the moving chamber 120, allowing the flow hole 240 to be connected to the outside, enabling the filling and draining liquid to be injected or discharged at a large flow rate, thereby achieving rapid filling. At the same time, the elastic element 400 is compressed and accumulates elastic restoring force. When filling and draining ends, it is only necessary to remove the external force applied to the end 260, and the elastic element 400 releases the elastic restoring force, which allows the valve core 200 to spring back, so that the end 260 returns to the state of sealing and cooperating with the step 140. The structure is simple and the stability is good.

[0126] Example 9

[0127] Please see Figure 1 , 2 In this embodiment, at least one sealing element 800 is provided around the periphery of the end 260.

[0128] In this embodiment, the sealing element 800 is disposed around the periphery of the end 260. The sealing element 800 can be an O-ring, and correspondingly, a groove 5222 can be disposed around the outer wall of the end 260 for placing the O-ring. The number of sealing elements 800 can be set according to actual needs. In this embodiment, the sealing element 800 consists of two O-rings disposed parallel to each other around the periphery of the end 260. In some embodiments, the sealing element 800 can also be one, three, four, or even more, without specific limitation.

[0129] The O-ring can be made of perfluoroether.

[0130] When the elastic element 400 is in the extended state, the sealing element 800 located around the end 260 cooperates with the inner wall of the step 140 of the valve seat 100 to seal the outlet of the motion chamber 120.

[0131] The valve provided by the present invention achieves a seal between the valve core 200 and the valve seat 100 by means of a sealing element 800 arranged around the periphery of the end 260, thereby ensuring the airtightness of the valve seat 100 and preventing leakage of residual liquid.

[0132] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A propellant filling and discharging valve for use in a liquid orbital attitude control propulsion system, characterized in that, include: A valve seat with a moving chamber is inserted; The valve core is movably fitted into the moving cavity, with a blind hole at one end, several flow holes in the middle, and a valve core with an end cap at the other end. A connector plug is connected to the inlet of the motion cavity and has a flow channel. An elastic element is disposed within the motion cavity, with one end connected to the connector plug and the other end connected to the valve core; as well as A detection device located inside the moving cavity for detecting the position of the valve core and discharging static electricity; When the elastic element is in the extended state, the end seals the outlet of the motion cavity; The detection device includes: a switch assembly fixedly embedded in the inner wall of the middle part of the motion cavity; and a drive assembly movably passing through the inner wall of the middle part of the motion cavity; the drive assembly can trigger the switch assembly under the drive of the valve core; The switching assembly includes two electrostatic plates facing the interior of the motion cavity; the driving assembly includes a driving rod with one end facing the electrostatic plates and the other end partially extending into the motion cavity; and a reset spring with one end fixed to the inner wall of the middle part of the motion cavity and the other end connected to the driving rod. When the drive assembly is pushed back into the mounting hole of the valve seat by the valve core, the movable electric piece can simultaneously contact and conduct with the two electrostatic pieces to trigger the switch assembly and discharge static electricity; when the valve core no longer pushes the drive assembly, the return spring of the drive assembly pushes the drive rod back into the valve seat, and the movable electric piece disengages from contact with the two separate electrostatic pieces.

2. The propellant injection / discharge valve according to claim 1, characterized in that, The switch assembly further includes: a housing cover that is fixedly embedded in the inner wall of the middle part of the motion cavity; The two electrostatic plates are fixed to the shell cover at intervals by electrode posts; the electrode posts are connected to wires.

3. The propellant injection / discharge valve according to claim 2, characterized in that, The electrostatic sheet is bent at one end toward the kinetic sheet to form a contact portion.

4. The propellant injection / discharge valve according to claim 3, characterized in that, The material of the shell cover and the drive rod is polytetrafluoroethylene; The electrostatic sheet and the kinetic sheet are made of beryllium bronze; The electrode post is made of aluminum.

5. The propellant injection / discharge valve according to claim 1, characterized in that, The outlet of the motion cavity is also covered with a protective cap.

6. The propellant injection / discharge valve according to claim 1, characterized in that, A filter element is also provided at the connection between the elastic element and the valve core.

7. The propellant injection / discharge valve according to claim 6, characterized in that, The mesh size of the filter element ranges from 80 to 100.

8. The propellant injection / discharge valve according to claim 1, characterized in that, The valve seat has an inwardly extending step at one end that seals with the end head; The inner diameter of the step is equal to the diameter of the end.

9. The propellant injection / discharge valve according to claim 8, characterized in that, At least one seal is provided around the periphery of the end.

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