Liquid rocket adding and discharging connector

Abstract

The invention relates to the technical field of rockets, in particular to a liquid rocket adding and discharging connector which comprises a shell and an ejector rod, the shell is provided with a closed end and an open end opposite to each other, a cavity is formed in the shell and communicated with the open end, the open end is suitable for being communicated with an adding and discharging valve, and the ejector rod is arranged in the cavity and comprises a rod body and an end. The axial direction of the rod body extends in the direction from the closed end to the open end, the end is arranged at the end, close to the open end, of the rod body, a mounting hole is formed in the end face, facing the adding and discharging valve, of the end, the mounting hole is communicated with the cavity, a valve body is arranged in the mounting hole, and the valve body is suitable for discharging medium gas in the adding and discharging valve out of the shell. Medium gas in the gas cavity is discharged out of the connector through the valve body, the pressure in the gas cavity is increased due to gasification of low-temperature media remaining in the gas cavity, the problem that the closed valve element is opened again due to increase of the pressure of the gas cavity is solved, and the reliability of opening and closing control over the adding and discharging valve by the connector is further improved. And the air tightness of the charging and discharging valve is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of rockets, and in particular to a liquid rocket filling and draining connector. Background Art

[0002] The cryogenic filling and draining connector is one of the important single-machine equipment in the launch process of liquid launch vehicles. Its main functions are to complete the connection between the ground filling system and the rocket system, for the filling or draining of propellants / oxidants, functions such as dropping off before launch or dropping off at zero seconds.

[0003] Currently, for domestic traditional liquid launch vehicles, the oxidant used is mostly liquid oxygen, and the propellants are mostly liquid hydrogen and liquid methane, all of which are cryogenic media. The cryogenic connector mostly adopts a three-hook claw structure and relies on external energy for pneumatic locking. If the external energy system fails, it will affect the locking function of the connector. A few minutes before the rocket takes off, the cylinder needs to drive the hook claws to unlock and drop off in advance. Relying on external energy to unlock, if the external energy system fails, it will affect the unlocking and dropping off function of the connector. The unlocking and dropping off of the hook claws require a certain time response and are not suitable for dropping off at zero seconds. If the launch is postponed or cancelled, the connector needs to be manually re-docked, posing risks to personnel safety such as cryogenic frostbite, inflammability, and explosiveness. Summary of the Invention

[0004] The present invention provides a liquid rocket filling and draining connector to solve one of the defects in the prior art. The end head is provided with an installation hole on the end face. A valve body is arranged in the installation hole. Through the opening of the valve body, the medium gas in the air chamber can enter the installation hole, then be discharged into the cavity of the connector through the installation hole, and then be discharged to the outside of the connector from the cavity, thereby preventing the pressure in the air chamber from rising due to the gasification of the cryogenic medium remaining in the air chamber after the valve core of the filling and draining valve is closed, avoiding the problem that the closed valve core is opened again due to the increase in the air chamber pressure, further improving the reliability of the connector's control over the opening and closing of the filling and draining valve, and ensuring the airtightness of the filling and draining valve itself.

[0005] The present invention provides a liquid rocket filling and draining connector, including a housing and a push rod. The housing has a closed end and an open end opposite to each other. A cavity is arranged inside the housing, and the cavity communicates with the open end. The open end is adapted to communicate with the filling and draining valve. The push rod is arranged in the cavity. The push rod includes a rod body and an end head. The axial direction of the rod body extends along the direction from the closed end to the open end. The end head is arranged at one end of the rod body close to the open end. The end face of the end head facing the filling and draining valve is provided with an installation hole, and the installation hole communicates with the cavity. A valve body is arranged in the installation hole, and the valve body is adapted to discharge the medium gas in the filling and draining valve to the outside of the housing.

[0006] According to a liquid rocket filling and draining connector provided by the present invention, the valve body is a check valve.

[0007] A liquid rocket filling and draining connector provided according to the present invention, wherein a protruding portion is provided on the circumferential side surface of the end head, a recessed portion is provided at the open end and is adapted to cooperate with the protruding portion, and the recessed portion extends from the end surface of the open end towards the closed end.

[0008] A liquid rocket filling and draining connector provided according to the present invention, wherein the shape of the protruding portion is annular, and the protruding portion is wound around the circumferential side surface of the end head.

[0009] A liquid rocket filling and draining connector provided according to the present invention, wherein the protruding portion is provided with a first inclined surface, the first inclined surface gradually inclines outwards along the direction from the closed end to the open end, and the inner surface of the recessed portion is provided with a second inclined surface adapted to cooperate with the first inclined surface.

[0010] A liquid rocket filling and draining connector provided according to the present invention, wherein a spring energy storage sealing ring is provided between the circumferential side surface of the end head and the inner side surface of the open end.

[0011] A liquid rocket filling and draining connector provided according to the present invention, wherein the cavity includes a first cavity and a second cavity which are sequentially arranged and communicated along the direction from the closed end to the open end, the housing is provided with a first air hole and a second air hole, the rod body extends from the first cavity to the second cavity, one end of the rod body located in the first cavity is provided with a piston, the piston divides the first cavity into a first chamber and a second chamber, the first air hole is communicated with the first chamber, and the second air hole is communicated with the second chamber.

[0012] A liquid rocket filling and draining connector provided according to the present invention, wherein an elastic member is provided in the second cavity, the elastic member is adapted to expand and contract along the axial direction of the rod body, one end of the elastic member abuts against the piston, and the other end abuts against the housing.

[0013] A liquid rocket filling and draining connector provided according to the present invention, wherein the housing includes a first housing and a second housing, the first housing constructs the closed end and the first cavity is arranged inside, the second housing constructs the open end and the second cavity is arranged inside, the first housing and the second housing are connected by a cold insulation plate, and the outer surface of the second housing is wrapped with a heat insulation member.

[0014] A liquid rocket filling and draining connector provided according to the present invention, wherein the open end and the filling and draining valve are detachably connected by a clamping device.

[0015] The liquid rocket filling and draining connector provided by the present invention has a closed end at one end of the outer shell, an open end with an opening at the other end, a cavity inside the outer shell, the cavity penetrating to the open end, a push rod disposed inside the cavity, the axial extension direction of the push rod being the direction from the closed end to the open end of the outer shell, the push rod consisting of a rod body and a head, one end of the rod body being close to the closed end, the other end being close to the open end, and the end close to the open end being connected to the head. The open end is connected to the housing of the filling and draining valve, and thus an air chamber is enclosed by the open end and the housing of the filling and draining valve, and the push rod can linearly reciprocate along its axial direction inside the cavity.

[0016] During the forward movement of the push rod, the head enters the air chamber from the opening of the open end and approaches the valve core of the filling and draining valve until the end face of the head contacts the valve core. Continuing to move forward, the head pushes the valve core to move synchronously to open the filling and draining valve. During the backward movement of the push rod, the head resets the valve core of the filling and draining valve, closes the filling and draining valve, and the head gradually moves away from the valve core of the filling and draining valve until the head returns from the air chamber to the open end. The head is provided with a mounting hole on its end face, a valve body is disposed inside the mounting hole, and through the opening of the valve body, the medium gas in the air chamber can enter the mounting hole, then be discharged into the cavity of the connector through the mounting hole, and then be discharged to the outside of the connector through the cavity, thereby preventing the low-temperature medium remaining in the air chamber from vaporizing and causing the pressure in the air chamber to increase after the valve core of the filling and draining valve is closed, avoiding the problem that the closed valve core is opened again due to the increase in the air chamber pressure, further improving the reliability of the connector's on-off control of the filling and draining valve, and ensuring the airtightness of the filling and draining valve itself. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0018] Figure 1 is a schematic structural diagram of the liquid rocket filling and draining connector provided by the embodiment of the present invention; Figure 2 is a schematic structural diagram of the valve body of the liquid rocket filling and draining connector provided by the embodiment of the present invention; Figure 3 is Figure 1 the A-A sectional view of; Figure 4 is Figure 3 the B-B sectional view of; Figure 5 is a schematic structural diagram of the locking component of the clamping device in the first position and the second position provided by the embodiment of the present invention.

[0019] Reference Signs: 100. Outer shell; 110. Closed end; 120. Open end; 130. Cavity; 131. First cavity; 132. Second cavity; 140. First housing; 141. First air hole; 142. Second air hole; 143. First chamber; 144. Second chamber; 150. Second housing; 160. Cold insulation plate; 170. Heat insulation member; 180. Liquid medium channel; 200. Thumb rod; 210. Rod body; 211. Piston; 212. Elastic member; 213. First seal; 214. Second seal; 220. End; 221. Mounting hole; 2211. First hole section; 2212. Second hole section; 2213. Third hole section; 2214. Sealing surface; 222. Valve body; 2221. Steel ball; 2222. Spring; 2223. Exhaust hole; 223. Protrusion; 224. Spring energy storage seal ring; 300. Clamping device; 310. Snap ring; 320. Clamping block; 321. Groove; 330. Locking member; 331. Straight part; 332. Bending part; 340. Pull rod; 341. First connection hole; 342. Second connection hole; 350. Fixed seat; 351. Pin shaft; 360. Connecting rope; 410. Active unlocking rope; 420. Passive unlocking rope; 500. Connector; 600. Filling and discharging valve; 610. Valve core; 620. Air cavity. Detailed implementation mode

[0020] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments in the present invention belong to the scope of protection of the present invention.

[0021] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the embodiments of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0022] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly defined and limited, the terms "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific situations.

[0023] In the embodiments of the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0024] In the description of this specification, the descriptions with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without conflict, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0025] As Figure 1 shown, the liquid rocket filling and draining connector 500 provided by the embodiments of the present invention includes a housing 100 and a push rod 200. The housing 100 has opposite closed ends 110 and open ends 120. A cavity 130 is provided inside the housing 100. The cavity 130 communicates with the open end 120. The open end 120 is adapted to communicate with a filling and draining valve 600. The push rod 200 is disposed in the cavity 130. The push rod 200 includes a rod body 210 and a head 220. The axial direction of the rod body 210 extends along the direction from the closed end 110 to the open end 120. The head 220 is disposed at one end of the rod body 210 close to the open end 120. An installation hole 221 is provided on the end face of the head 220 facing the filling and draining valve 600. The installation hole 221 communicates with the cavity 130. A valve body 222 is provided in the installation hole 221. The valve body 222 is adapted to discharge the medium gas in the filling and draining valve 600 to the outside of the housing 100.

[0026] The liquid rocket filling and draining connector 500 according to the embodiment of the present invention has a closed end 110 at one end of the outer shell 100, and an open end 120 with an opening at the other end. There is a cavity 130 inside the outer shell 100, and the cavity 130 penetrates to the open end 120. The ejector rod 200 is arranged inside the cavity 130, and the axial extension direction of the ejector rod 200 is the direction from the closed end 110 to the open end 120 of the outer shell 100. The ejector rod 200 is composed of a rod body 210 and a head 220. One end of the rod body 210 is close to the closed end 110, and the other end is close to the open end 120, and the end close to the open end 120 is connected to the head 220. The open end 120 is connected to the housing of the filling and draining valve 600, and thus an air cavity 620 is enclosed by the open end 120 and the housing of the filling and draining valve 600. The ejector rod 200 can move linearly back and forth along its axis in the cavity 130.

[0027] During the forward movement of the ejector rod 200, the head 220 enters the air cavity 620 from the opening of the open end 120 and approaches the valve core 610 of the filling and draining valve 600 until the end face of the head 220 contacts the valve core 610. Continuing to move forward, the head 220 pushes the valve core 610 to move synchronously to open the filling and draining valve 600. During the backward movement of the ejector rod 200, the head 220 resets the valve core 610 of the filling and draining valve 600, the filling and draining valve 600 closes, and the head 220 gradually moves away from the valve core 610 of the filling and draining valve 600 until the head 220 returns from the air cavity 620 to the open end 120. The head 220 is provided with a mounting hole 221 on its end face, and a valve body 222 is arranged in the mounting hole 221. The medium gas in the air cavity 620 can enter the mounting hole 221 through the opening of the valve body 222, then be discharged into the cavity 130 of the connector 500 through the mounting hole 221, and then be discharged to the outside of the connector 500 through the cavity 130. Thereby, after the valve core 610 of the filling and draining valve 600 is closed, the low-temperature medium remaining in the air cavity 620 is prevented from vaporizing and causing the pressure in the air cavity 620 to rise, avoiding the problem that the closed valve core 610 is opened again due to the increase in the pressure in the air cavity 620, further improving the reliability of the connector 500 in controlling the opening and closing of the filling and draining valve 600, and ensuring the airtightness of the filling and draining valve 600 itself.

[0028] It can be understood that because a radial pantograph seal structure is provided on the docking surface of the connector 500 and the filling and draining valve 600, this structure occupies a certain space, and it is not convenient to design the valve core 610 of the filling and draining valve 600 and the ejector rod 200 of the connector 500 to be closely attached together. Even if the seal structure of the docking surface is modified to fit the valve core 610 of the filling and draining valve 600 and the head 220 of the ejector rod 200 of the connector 500 together, there will still be a very small gap in reality even if there is no air cavity 620 in theory, and a small amount of liquid oxygen will remain, posing a risk of vaporization and pressure increase. Therefore, it is necessary to set the valve body 222.

[0029] Such as Figure 2As shown, according to an embodiment provided by the present invention, the valve body 222 is a one-way valve. In this embodiment, the one-way valve is composed of a steel ball 2221 and a spring 2222. The mounting hole 221 is a stepped hole that is sequentially divided into a first hole section 2211, a second hole section 2212, and a third hole section 2213 from the closed end 110 to the open end 120. The aperture of the first hole section 2211 is smaller than that of the second hole section 2212, and the aperture of the second hole section 2212 is larger than that of the third hole section 2213. An exhaust hole 2223 communicating with the cavity 130 is provided on the first hole section 2211. The end face between the second hole section 2212 and the third hole section 2213 is a sealing surface 2214. The spring 2222 and the steel ball 2221 are both arranged in the second hole section 2212. One end of the spring 2222 abuts against the end face between the first hole section 2211 and the second hole section 2212, and the other end is connected to the steel ball 2221. The steel ball 2221 abuts against the sealing surface 2214.

[0030] When the ejector rod 200 of the connector 500 is in the closed state, that is, the end 220 is located at the open end 120, the elastic force of the spring 2222 presses the steel ball 2221 against the sealing surface 2214 of the mounting hole 221 to achieve the sealing of the cavity 130 of the connector 500. After the connector 500 is docked with the charging and discharging valve 600, the residual liquid oxygen in the air cavity 620 vaporizes and increases in pressure. When the pressure is greater than the elastic force of the spring 2222, the pressure in the air cavity 620 pushes open the steel ball 2221. The steel ball 2221 compresses the spring 2222, and a certain gap is formed between the steel ball 2221 and the sealing surface 2214. The gas flows into the mounting hole through the gap and is discharged to the cavity 130 of the connector 500 through the exhaust hole 2223, and further discharged to the atmosphere. After the exhaust is completed, the pressure in the air cavity 620 decreases, the spring 2222 returns from the compressed state to the extended state, and the steel ball 2221 is pushed back to abut against the sealing surface 2214 again to realize the partition and sealing between the cavity 130 and the air cavity 620.

[0031] According to an embodiment provided by the present invention, a protrusion 223 is provided on the circumferential side surface of the end 220, and a recess matching the protrusion 223 is provided at the open end 120. The recess extends from the end face of the open end 120 towards the closed end 110. In this embodiment, the circumferential side surface of the end 220 that circumferentially surrounds the axis of the ejector rod 200 is the circumferential side surface. The protrusion 223 is provided on the circumferential side surface. Correspondingly, a recess is provided at the open end 120. The shape of the recess matches the shape of the protrusion 223, and the recess extending direction of the recess is from the end face of the open end 120 towards the closed end 110. During the reciprocating movement of the ejector rod 200, the protrusion 223 can reciprocate in the recess. That is, when the ejector rod 200 moves forward, the protrusion 223 moves from the recess towards the air cavity 620 until it leaves the recess. When the ejector rod 200 moves backward, the protrusion 223 moves from the air cavity 620 towards the recess until it enters the recess.

[0032] After the addition and discharge valve 600 is closed, the reset protrusion 223 of the ejector rod 200 abuts against the end of the recessed portion, thereby limiting the ejector rod 200 through the cooperation between the protrusion 223 and the recessed portion, and preventing the ejector rod 200 from moving backward continuously.

[0033] According to an embodiment provided by the present invention, the shape of the protrusion 223 is annular, and the protrusion 223 is wound around the circumferential side surface of the end 220. In this embodiment, the protrusion 223 is distributed in a circumferentially extending manner on the circumferential side surface, forming an annular protrusion 223 that circumferentially surrounds the end 220. Correspondingly, an annular recessed portion is also provided on the end surface of the open end 120 of the housing to cooperate with the annular protrusion 223.

[0034] In other embodiments, the protrusion 223 can be one or more discontinuous structures, which are distributed around the circumferential side surface of the end 220. In this embodiment, the protrusion 223 and the end 220 are of an integral structure. In other embodiments, the protrusion 223 and the end 220 can be of an independent connection structure.

[0035] According to an embodiment provided by the present invention, the protrusion 223 is provided with a first inclined surface, and the first inclined surface gradually inclines outward along the direction from the closed end 110 to the open end 120. The inner surface of the recessed portion is provided with a second inclined surface that cooperates with the first inclined surface. In this embodiment, the side surface that constitutes the circumferential side surface of the end 220 on the protrusion 223 is the first inclined surface. When the end 220 is cylindrical, the first inclined surface radially inclines outward along the direction from the closed end 110 to the open end 120, that is, the protrusion 223 is integrally conical, and the shape of its cross-section is triangular. Correspondingly, the inner surface of the recessed portion is also configured with a second inclined surface, and the inclination and position of the second inclined surface are both matched with the first inclined surface. The cooperation between the first inclined surface and the second inclined surface can ensure the structural strength of the cooperation between the protrusion 223 and the recessed portion while limiting the ejector rod 200.

[0036] In other embodiments, a part of the circumferential side surface of the protrusion 223 can also be an inclined surface, that is, a structure composed of the combination of the inclined surface and the horizontally extending surface.

[0037] According to an embodiment provided by the present invention, a spring energy storage seal ring 224 is provided between the circumferential side surface of the end 220 and the inner side surface of the open end 120. In this embodiment, the circumferential side surface of the end 220 is in contact with the inner circumferential surface of the open end 120. To ensure the sealing between the end 220 of the ejector rod 200 and the housing 100, a spring energy storage seal ring 224 is provided between the end 220 and the open end 120.

[0038] The traditional plastic hot pressing ring presses plastic onto a metal part to form a plastic-metal composite part. The pressing process is complex and the rejection rate is high. After the plastic sealing belt is damaged, the composite part needs to be returned to the factory for repair, and the repair cycle is long. However, the spring energy storage sealing ring 224 of the present invention is used as a standard part, and the machined parts that cooperate with it only need to pay attention to the matching dimensions, which is convenient for processing. After the spring energy storage sealing ring 224 is damaged, the damaged part can be removed and replaced with a new spring energy storage sealing ring 224.

[0039] Using the spring energy storage sealing ring 224 to replace the traditional plastic hot pressing ring for sealing is applicable to low-temperature conditions, meets the requirements of the low-temperature medium to be filled, reduces the requirements for heat insulation and cold insulation, simplifies the structure, is convenient for processing, is convenient for replacing the sealing parts, and is more convenient for maintainability.

[0040] In this embodiment, the spring energy storage sealing ring 224 is arranged at the position on the circumferential side surface of the end 220 where the protruding part 223 is not provided, and is arranged around the circumference of the end 220. In other embodiments, the spring energy storage sealing ring 224 can also be arranged on the surface of the protruding part 223, or on the inner side surface of the open end 120.

[0041] According to an embodiment provided by the present invention, the cavity 130 includes a first cavity 131 and a second cavity 132 that are sequentially arranged and communicated along the direction from the closed end 110 to the open end 120. The outer shell 100 is provided with a first air hole 141 and a second air hole 142. The rod body 210 extends from the first cavity 131 to the second cavity 132. One end of the rod body 210 located in the first cavity 131 is provided with a piston 211. The piston 211 divides the first cavity 131 into a first chamber 143 and a second chamber 144. The first air hole 141 is communicated with the first chamber 143, and the second air hole 142 is communicated with the second chamber 144.

[0042] In this embodiment, the cavity 130 is mainly composed of a first cavity 131 and a second cavity 132. The first cavity 131 is close to the closed end 110, and the second cavity 132 is close to the open end 120, that is, the first cavity 131, the second cavity 132 and the opening are sequentially communicated. The rod body 210 penetrates from the first cavity 131 to the second cavity 132 to reach the opening. Among them, the second cavity 132 is used as a strong storage for liquid medium, and the second wall body communicates with the medium inlet channel constructed by the outer shell 100. A piston 211 is arranged in the first cavity 131. The piston 211 is fixed to the end of the rod body 210 by threaded connection. Therefore, the two ends of the rod body 210 are respectively the piston 211 and the end 220. The outer side surface of the piston 211 contacts the inner wall of the first cavity 131. Thus, the first cavity 131 on both sides of the piston 211 in the axial direction is respectively the first chamber 143 and the second chamber 144. The first air hole 141 constructed by the shell communicates with the first chamber 143, and the second air hole 142 constructed by the shell communicates with the second chamber 144.

[0043] Air is supplied into the first chamber 143 through the first air hole 141. The pressure in the first chamber 143 increases, pushing the piston 211 to move forward. The second chamber 144 is compressed to exhaust air through the second air hole 142, thereby driving the ejector rod 200 to move forward and pushing the valve core 610 to open the charge and bleed valve 600. Air is supplied into the second chamber 144 through the second air hole 142. The pressure in the second chamber 144 increases, pushing the piston 211 to move backward. The first chamber 143 is compressed to exhaust air through the first air hole 141, thereby driving the ejector rod 200 to move backward and away from the valve core 610 to close the charge and bleed valve 600.

[0044] The first cavity 131, the piston 211, the first air hole 141 and the second air hole 142 form a cylinder structure, that is, a driving structure for the ejector rod 200. Compared with the traditional method of driving the ejector rod 200 to move to open the charge and bleed valve 600 by intake air pressure and pushing the ejector rod 200 to move to close the charge and bleed valve 600 by the spring restoring force, in the connector 500 of the present invention, the reciprocating movement of the ejector rod 200 is driven by pneumatic control. The cooperation between the first air hole 141 and the second air hole 142 effectively realizes the action of the cylinder structure, and the control is more stable and accurate. The filling control of the charge and bleed valve 600 by the connector 500 is more sensitive.

[0045] In this embodiment, a first seal 213 is provided between the outer side surface of the piston 211 and the inner wall of the second cavity 132 to ensure the airtightness of the first chamber 143 and the second chamber 144 on both sides of the piston 211.

[0046] According to an embodiment provided by the present invention, an elastic member 212 is provided in the second chamber 144. The elastic member 212 is adapted to expand and contract along the axial direction of the rod body 210. One end of the elastic member 212 abuts against the piston 211, and the other end abuts against the housing 100. In this embodiment, the elastic member 212 is provided on the end surface of the piston 211 facing the second chamber 144. The elastic member 212 abuts against the end surface of the housing that constructs the second chamber 144. The expansion and contraction direction of the elastic member 212 is the moving direction of the ejector rod 200.

[0047] Air is supplied into the first chamber 143 through the first air hole 141. The pressure in the first chamber 143 increases, pushing the piston 211 to move forward. The elastic member 212 is compressed synchronously. The second chamber 144 is compressed to exhaust air through the second air hole 142, thereby driving the ejector rod 200 to move forward and pushing the valve core 610 to open the charge and bleed valve 600. Air is supplied into the second chamber 144 through the second air hole 142. The pressure in the second chamber 144 increases, pushing the piston 211 to move backward. The elastic member 212 expands synchronously. The first chamber 143 is compressed to exhaust air through the first air hole 141, thereby driving the ejector rod 200 to move backward and away from the valve core 610 to close the charge and bleed valve 600.

[0048] During the process of the ejector rod 200 moving forward to open the pressure addition and release valve 600, the elastic member 212 accumulates elastic force. During the process of the ejector rod 200 moving backward to close the pressure addition and release valve 600, the restoring force of the elastic member 212 generates a thrust on the piston 211, assisting the pneumatic acting force to act on the piston 211 and helping the piston 211 and the ejector rod 200 to reset.

[0049] In this embodiment, the elastic member 212 can adopt a helical spring. The piston 211 is provided with a mounting groove along its axial direction, and the end of the elastic member 212 enters the mounting groove and is connected to the bottom surface of the mounting groove.

[0050] According to an embodiment provided by the present invention, the housing 100 includes a first housing 140 and a second housing 150. The first housing 140 is configured with a closed end 110 and a first cavity 131 is provided inside. The second housing 150 is configured with an open end 120 and a second cavity 132 is provided inside. The first housing 140 and the second housing 150 are connected by a cold insulation plate 160, and the outer surface of the second housing 150 is wrapped with a heat insulation member 170.

[0051] In this embodiment, the housing 100 is mainly composed of the first housing 140 and the second housing 150. The first housing 140 constructs a first cavity 131, a first air hole 141, and a second air hole 142. The second housing 150 constructs a second cavity 132, a liquid medium channel 180, an open end 120, and a transition channel connecting the first cavity 131 and the second cavity 132. One end of the first housing 140 is closed as the closed end 110 of the housing 100, and the other end is open and communicates with the end of the transition channel of the second housing 150.

[0052] A circular cold insulation plate 160 is provided between the end face of the open end of the first housing 140 and the end face of the transition channel of the second housing 150. The structure of the first housing 140 and the piston 211 constitutes a cylinder structure, and the second housing 150 and the ejector rod 200 form the main structure of the connector 500. Therefore, the present invention is equivalent to only providing a cold insulation plate 160 between the housing of the connector 500 and the housing of the cylinder, without providing a cold insulation structure on the ejector rod 200, effectively shortening the length of the ejector rod 200, not only reducing the size of the ejector rod 200, but also reducing the structural size of the entire connector 500 and making it lighter in weight.

[0053] In this embodiment, a second seal 214 is provided between the inner side surface of the open end of the first housing 140 and the outer wall of the rod body 210, and between the inner side surface of the end of the transition channel of the first housing 140 and the outer wall of the rod body 210.

[0054] According to an embodiment provided by the present invention, the open end 120 and the filling and draining valve 600 are detachably connected through a clamping device 300. In this embodiment, the open end 120 of the outer shell 100 can be set in a flange shape, and the end of the housing of the filling and draining valve 600 connected to the open end 120 can also be in a flange shape. The open end 120 and the filling and draining valve 600 are connected through the clamping device 300. During the filling process before the rocket takes off, the connector 500 is connected to the filling and draining valve 600 through the clamping device 300. After the rocket takes off to a certain height, the clamping device 300 is separated from the filling and draining valve 600, so that the connector 500 and the filling and draining valve 600 are disengaged at zero seconds.

[0055] As Figure 3 , Figure 4 and Figure 5 shown, the clamping device 300 provided by the embodiment of the present invention includes a snap ring 310, a clamping block 320 and a locking member 330. The shape of the clamping block 320 is arc-shaped, and a groove 321 is provided on the inner arc surface of the clamping block 320. The locking member 330 is arranged on the snap ring 310, and the locking member 330 is adapted to switch between a pressed state and a separated state with the outer arc surface of the clamping block 320. In the pressed state, the inner side surface of the snap ring 310 presses against the outer arc surface of the clamping block 320, and the flanges of the filling and draining valve 600 and the connector 500 are embedded in the groove 321. In the separated state, the snap ring 310 is separated from the clamping block 320, and the groove 321 is disengaged from the flanges of the filling and draining valve 600 and the connector 500.

[0056] The clamping device 300 of the embodiment of the present invention is mainly composed of a snap ring 310, a clamping block 320 and a locking member 330. The snap ring 310 is an arc-shaped structure, adapted to the filling and draining valve 600. The arc-shaped snap ring 310 has an inner arc surface and an outer arc surface. The inner arc surface is recessed inward to form a groove 321. After the flanges of the filling and draining valve 600 and the connector 500 are aligned, the snap ring 310 is installed outside the flange, and the flange is embedded in the groove 321 and clamped in the groove 321, thereby realizing connection and limitation of the filling and draining valve 600 and the connector 500 in the axial direction and avoiding separation along the axial direction of the flange. Since the snap ring 310 is arc-shaped, the snap ring 310 can also realize connection and limitation of the filling and draining valve 600 and the connector 500 in the radial direction.

[0057] A locking component 330 is provided on the snap ring 310, and the snap ring 310 is in a circular ring shape adapted to the arc-shaped block 320. When the snap connection device 300 connects the charging and discharging valve 600 and the connector 500, the locking component 330 is in a compressed state. At this time, the locking component 330 presses against the outer arc surface of the block 320, and the inner side surface of the snap ring 310 presses against the outer arc surface of the block 320. The position of the block 320 is fixed by the locking component 330 and the snap ring 310 to achieve a stable connection between the charging and discharging valve 600 and the connector 500. When the snap connection device 300 is disengaged and separated from the charging and discharging valve 600 and the connector 500, the locking component 330 is in a separated state. At this time, the locking component 330 leaves the outer arc surface of the block 320, and the inner side surface of the snap ring 310 is separated from the outer arc surface of the block 320. The locking component 330 and the snap ring 310 no longer fix the position of the block 320 to achieve the detachment of the charging and discharging valve 600 and the connector 500.

[0058] The snap connection device 300 of the present invention has a simple structural composition. During docking, only the block 320 needs to be installed on the outer side of the flange of the charging and discharging valve 600 and the connector 500, and then by pushing the snap ring 310 to drive the locking component 330 to be pushed axially along the snap ring 310 to the outside of the block 320, the docking fixation can be achieved. During detachment, only by pulling the snap ring 310 axially along the snap ring 310 and separating the snap ring 310 from the snap ring, the detachment of the charging and discharging valve 600 and the connector 500 can be achieved. Thus, the installation and detachment of the snap connection device 300 are simplified, the structure of the cryogenic charging and discharging connector 500 for liquid rockets is simple, the operation is convenient, the manual docking force is small, it can be unattended, the safety risk to the operator is reduced, the locking reliability of the snap connection device 300 is high, the detachment reliability is high, and it is suitable for the connector 500 to implement zero-second detachment after the rocket takes off to a certain height.

[0059] According to an embodiment provided by the present invention, the locking component 330 includes a spring piece. The spring piece is connected to the snap ring 310 and extends along the axial direction of the snap ring 310 on the inner side surface of the snap ring 310. The spring piece is adapted to switch between a first position and a second position. In the first position, the spring piece presses against the outer arc surface of the block 320, and the snap ring 310 locks the block 320. In the second position, the spring piece is inclined and deformed outward from the snap ring 310 to form a set angle with the outer side surface of the snap ring 310, and the snap ring 310 unlocks the block 320.

[0060] In this embodiment, the locking component 330 uses a spring piece. The spring piece has a certain deformation recovery ability. The lower part of the spring piece is fixed on the snap ring 310, and the upper part and the middle part of the spring piece are the main structures for the action of the spring piece, and extend along the axial direction of the snap ring 310 within the range of the inner side surface of the snap ring 310.

[0061] During the installation of the clamping device 300, the spring piece switches from the second position to the first position, that is, the snap ring 310 is advanced along its axial direction to the outside of the clamping block 320. The spring piece is inclined and deformed to a set angle from the inner side surface of the snap ring 310 to the outer side surface in its extending direction, so as to yield to the clamping block 320 in the moving direction of the snap ring 310. After the snap ring 310 moves into place, the spring piece deforms and recovers. The spring piece can be pressed against the outer arc surface of the clamping block 320, and a certain pressing force is applied to the clamping block 320 through the connecting snap ring 310, locking the clamping block 320 to prevent the clamping block 320 from moving, and ensuring the connection and fixation of the pressure relief valve 600 and the connector 500.

[0062] During the detachment of the clamping device 300, the spring piece switches from the first position to the second position, that is, the snap ring 310 moves away from the clamping block 320 along its axial direction. Affected by the position of the clamping block 320, the spring piece is inclined and deformed to a set angle from the inner side surface of the snap ring 310 to the outer side surface in its extending direction, so as to yield to the clamping block 320 in the moving direction of the snap ring 310. After the snap ring 310 moves into place, the spring piece completely leaves the outer arc surface of the clamping block 320, deforms and recovers, and the snap ring 310, the spring piece and the clamping block 320 are separated, and no pressing force can be applied to the clamping block 320 anymore, unlocking the clamping block 320 so that the clamping block 320 can move away from the pressure relief valve 600 and the connector 500, ensuring the detachment of the pressure relief valve 600 and the connector 500.

[0063] The locking component 330 does not need to adopt a complex mechanical and pneumatic structure. Only simple deformation and recovery of the spring piece can be used to lock or unlock the clamping block 320, thereby making the composition structure of the clamping device 300 simpler, reducing the weight, volume and manufacturing cost of the device.

[0064] In other embodiments, the locking component 330 can adopt other structures, which can cooperate with the advancing and retracting movements of the snap ring 310 for installation and detachment, and can lock and unlock the clamping block 320 through simple actions.

[0065] According to an embodiment provided by the present invention, the clamping device 300 further includes a pull rod 340 and a fixed seat 350. The fixed seat 350 is arranged on the snap ring 310. The pull rod 340 is rotatably connected to the fixed seat 350 through a pin shaft 351. The pull rod 340 is adapted to be connected to both the active unlocking rope 410 and the passive unlocking rope 420. In this embodiment, the clamping device 300 is composed of a clamping block 320, a snap ring 310, a locking component 330, a pull rod 340 and a fixed seat 350. The fixed seat 350 is installed on the snap ring 310, and the rotational connection of the pull rod 340 on the fixed seat 350 is realized through the pin shaft 351. Under the action of an external pulling force, the pull rod 340 can rotate around the pin shaft 351.

[0066] The active unlocking rope 410 and the passive unlocking rope 420 are both connected to the pull rod 340, and both can provide external force for the pull rod 340. The connector 500 and the filling and discharging valve 600 are connected and locked through the clamping device 300. After the filling or discharging is completed, the clamping device 300 is unlocked by the rope triggering method formed by the active unlocking rope 410 and the passive unlocking rope 420, so that the clamping device 300, the connector 500 and the filling and discharging valve 600 fall off. When unlocking and falling off, the active unlocking rope 410 or the passive unlocking rope 420 triggers an external force to act on the pull rod 340, and the pull rod 340 rotates around the pin shaft 351. After rotating to a certain angle, the rope is tightened, exerting tension on the clamping ring 310, overcoming the elastic force of the spring sheet, and the spring sheet deforms toward the outside of the clamping ring 310, pulling the clamping ring 310 away from the block 320, and then the block 320 bounces radially outward along the clamping ring 310, separating from the flanges of the filling and discharge valve 600 and the connector 500, and the connector 500 falls off.

[0067] Active unlocking can be achieved by power sources such as air cylinders, hydraulic cylinders, and electric drives. The corresponding active unlocking rope 410 applies a pulling force extending axially along the retaining ring 310 to the pull rod 340. The active unlocking rope 410 is set with a certain overhang to adapt to the response time of the active unlocking power source. The passive unlocking is fixed on a firm fixed support point without a power source. The corresponding passive unlocking rope 420 applies a pulling force extending axially along the retaining ring 310 to the pull rod 340. When the active unlocking fails, the passive unlocking is enabled without relying on an external power source, thereby achieving dual redundant unlocking and higher reliability.

[0068] According to an embodiment provided by the present invention, the pull rod 340 is provided with a first connecting hole 341 and a second connecting hole 342, the first connecting hole 341 is suitable for connecting the active unlocking rope 410, the second connecting hole 342 is suitable for connecting the passive unlocking rope 420, and the second connecting hole 342 and the first connecting hole 341 are arranged in sequence along the extension direction of the spring sheet.

[0069] In this embodiment, the pull rod 340 is provided with a first connecting hole 341 to connect the active unlocking rope 410, and a second connecting hole 342 to connect the passive unlocking rope 420. The pull rod 340 is a bent structure. The bent shape makes the position of the first connecting hole 341 in the axial direction of the retaining ring 310 closer to the retaining ring 310 than the second connecting hole 342. On the one hand, the first connecting hole 341 and the second connecting hole 342 can be positioned at a certain distance to avoid mutual interference between the active unlocking rope 410 and the passive unlocking rope 420 at the connection position. On the other hand, the overhang of the passive unlocking rope 420 can be made greater than the overhang of the active unlocking rope 410, that is, active unlocking is implemented first, and when the active unlocking fails, the passive unlocking is enabled. It does not rely on an external power source and has higher reliability.

[0070] According to an embodiment provided by the present invention, the spring piece includes a straight portion 331 and a bent portion 332. One end of the straight portion 331 is connected to the fixed seat 350, and the other end is connected to the bent portion 332. The bent portion 332 bends inwardly towards the inside of the snap ring 310. When the spring piece is in the first position, the straight portion 331 presses against the outer arc surface of the clamping block 320, and the bent portion 332 presses against the end face of the clamping block 320.

[0071] In this embodiment, the middle part of the spring piece is the straight portion 331, and the upper part is the bent portion 332. The straight portion 331 extends along the axial direction of the snap ring 310, and the extending end bends to form the bent portion 332. The straight portion 331 fits the outer arc surface of the clamping block 320, and the bent portion 332 is formed by bending from the outer arc surface of the snap ring 310 towards the end face of the snap ring 310. When the spring piece is in the first position, the straight portion 331 presses against the outer arc surface of the clamping block 320, and the bent portion 332 presses against the end face of the clamping block 320. In this way, the straight portion 331 can limit the position of the clamping block 320 in the radial direction along the snap ring 310, and the bent portion 332 can limit the position of the clamping block 320 in the axial direction along the snap ring 310. During the process of the spring piece switching between the first position and the second position, the straight portion 331 deforms and tilts, and the bent portion 332 moves from the end face of the clamping block 320 to the outer arc surface of the clamping block 320 and can move on the outer arc surface.

[0072] According to an embodiment provided by the present invention, the inner side surface of the snap ring 310 is an inclined surface that gradually inclines outward along the extending direction of the spring piece. In this embodiment, the inner side surface of the snap ring 310 is configured as an inclined surface, and the inclined surface gradually inclines outward towards the outer side surface along the direction from the straight portion 331 to the bent portion 332 of the spring piece. The inclined surface can make space for the deformation of the spring piece. When the spring piece deforms and tilts by a set angle during the process of switching between the first position and the second position, the inclination angle of the inclined surface is at least the set angle.

[0073] In this embodiment, the inner inclined surface of the snap ring 310 coincides with the outer inclined surface of the clamping block 320.

[0074] According to an embodiment provided by the present invention, the side wall of the groove 321 is an inclined surface that gradually inclines inward from the inner arc surface to the outer arc surface of the clamping block 320. In this embodiment, both side walls of the groove 321 are inclined surfaces, forming a groove shape that gradually contracts in the radial direction along the snap ring 310. Thus, the groove 321 is a V-shaped groove, which coincides with the flange shapes of the connector 500 and the bleed valve 600, further improving the connection and fixing stability of the groove 321 to the connector 500 and the bleed valve 600.

[0075] According to an embodiment provided by the present invention, the radian of the clamping block 320 is less than 180°, and there are multiple clamping blocks 320 which are evenly distributed around the axial direction of the clamping ring 310. In this embodiment, the clamping block 320 is an arc-shaped clamping block 320 with a radian less than 180°, which is arranged around the flanges of the connector 500 and the pressure relief valve 600 and is evenly distributed in the circumferential direction, providing locking forces in multiple directions and ensuring the balance of the locking forces.

[0076] In this embodiment, two clamping blocks 320 are adopted, and the two clamping blocks 320 are arranged oppositely in the radial direction. In other embodiments, the radian and the number of the clamping blocks 320 can be adjusted according to actual needs.

[0077] According to an embodiment provided by the present invention, the clamping block 320 is connected to the clamping ring 310 through a connecting rope 360. In this embodiment, each clamping block 320 is connected to the clamping ring 310 through a connecting rope 360. After the clamping block 320 is separated from the connector 500 and the pressure relief valve 600, the connector 500 falls off, and under the action of the connecting rope 360, the clamping block 320 is connected to the clamping ring 310. Thus, the integrity of the clamping device 300 is maintained, which is convenient for recycling.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A liquid rocket filling and discharge connector, characterized in that: The invention comprises an outer shell and a push rod, wherein the outer shell is provided with a closed end and an open end opposite to each other, a cavity is provided inside the outer shell, the cavity is communicated with the open end, the open end is suitable for communicating with a charging and discharging valve, the push rod is arranged in the cavity, the push rod comprises a rod body and an end head, the axial direction of the rod body extends from the closed end to the open end, the end head is arranged at one end of the rod body close to the open end, a mounting hole is provided on the end surface of the end head facing the charging and discharging valve, the mounting hole is communicated with the cavity, a valve body is provided in the mounting hole, and the valve body is suitable for discharging the medium gas in the charging and discharging valve to the outside of the outer shell.

2. The liquid rocket refueling and draining connector according to claim 1, characterized in that: The valve body is a one-way valve.

3. The liquid rocket refueling and draining connector according to claim 1, characterized in that: A protrusion is provided on the peripheral side surface of the end head, and a recess matched with the protrusion is provided at the open end, and the recess extends from the end surface of the open end toward the direction of the closed end.

4. The liquid rocket refueling and draining connector according to claim 3, characterized in that: The protrusion is in the shape of a ring and is arranged around the peripheral side surface of the end head.

5. The liquid rocket refueling and draining connector according to claim 3, characterized in that: The protruding portion is provided with a first inclined surface, which gradually inclines outwards along the direction from the closed end to the open end, and the inner surface of the recessed portion is provided with a second inclined surface matching the first inclined surface.

6. The liquid rocket refueling and draining connector according to claim 1, characterized in that: A spring energy storage sealing ring is arranged between the peripheral side surface of the end head and the inner side surface of the opening end.

7. The liquid rocket refueling and draining connector according to claim 1, characterized in that: The cavity includes a first cavity and a second cavity which are arranged in sequence and connected along the direction from the closed end to the open end, the shell is provided with a first air hole and a second air hole, the rod body extends from the first cavity to the second cavity, and a piston is provided at one end of the rod body located in the first cavity, the piston divides the first cavity into a first chamber and a second chamber, the first air hole is connected to the first chamber, and the second air hole is connected to the second chamber.

8. The liquid rocket refueling and draining connector according to claim 7, characterized in that: An elastic member is disposed in the second chamber. The elastic member is adapted to be extended and retracted along the axial direction of the rod body. One end of the elastic member abuts against the piston, and the other end abuts against the housing.

9. The liquid rocket refueling and draining connector according to claim 8, characterized in that: The outer shell includes a first shell and a second shell, the first shell is configured with the closed end and the first cavity is arranged inside, the second shell is configured with the open end and the second cavity is arranged inside, the first shell and the second shell are connected by a cold insulation plate, and the outer surface of the second shell is wrapped with an insulating member.

10. The liquid rocket refueling and draining connector according to any one of claims 1 to 9, characterized in that: The opening end is detachably connected to the filling and discharging valve via a clamping device.

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