Compensation-liquid collection multifunctional compensator for thermal control fluid loop of spacecraft

Abstract

The invention discloses a compensation-liquid collection multifunctional compensator for a thermal control fluid loop of a spacecraft. The compensation-liquid collection multifunctional compensator comprises a lower bottom assembly, a welded corrugated pipe assembly, a volute spiral spring chest expander, an electromagnetic valve, an angular displacement sensor, a storage box body and a guide ring. Wherein the bottom of the storage box body is connected with the lower bottom assembly; the welding corrugated pipe assembly is connected with the lower bottom assembly; the electromagnetic valve is connected with the inner wall of the lower bottom assembly and controls the opening and closing of an air cavity runner opening of the compensator; the bottom of the volute spiral spring chest expander is connected with the inner wall of the lower bottom assembly, and the end of a pull rope of the volute spiral spring chest expander is connected with the top of the welded corrugated pipe assembly. The angular displacement sensor is arranged on the volute spiral spring chest expander; and the guide ring is connected with the top end of the welded corrugated pipe assembly. The storage problem of the thermal control fluid loop of the spacecraft in an ultralow-temperature environment is solved, the environment tolerance range of the thermal control fluid loop is widened, and then the service life of the spacecraft is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of spacecraft thermal control fluid circuit compensators, and in particular relates to a compensation-liquid collection multifunctional compensator for a spacecraft thermal control fluid circuit. Background Art

[0002] Space thermal control fluid loops are the main means of active temperature control for space stations, satellites and other spacecraft. Changes in space environment temperature and accumulated loop leakage can cause pressure fluctuations in the fluid loop, resulting in too low pressure at the inlet of loop pump products causing cavitation or too high loop pressure leading to structural failure. At the same time, the spacecraft will experience an ultra-low temperature environment after landing. The exposed fluid loop units and fluid working fluids in the pipelines will solidify at low temperatures, and their volume expansion will damage the loop piping system and supporting products, causing failure of the thermal control fluid loop system. Summary of the invention

[0003] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art and provide a compensation-liquid collection multifunctional compensator for a thermal control fluid circuit of a spacecraft, thereby solving the storage problem of the thermal control fluid circuit of the spacecraft in an ultra-low temperature environment, improving the environmental tolerance range of the thermal control fluid circuit, and thereby extending the service life of the spacecraft.

[0004] The object of the present invention is achieved through the following technical solutions: A compensation-liquid collection multifunctional compensator for a thermal control fluid circuit of a spacecraft, comprising: a lower bottom assembly, a welded bellows assembly, a scroll spring tensioner, a solenoid valve, an angular displacement sensor, a tank body and a guide ring; wherein the bottom of the tank body is connected to the lower bottom assembly; the welded bellows assembly is arranged inside the tank body, and the welded bellows assembly is connected to the lower bottom assembly; the space enclosed by the inner side of the welded bellows assembly and the lower bottom assembly is the air cavity of the compensator, and the space enclosed by the welded bellows assembly and the tank body is the liquid cavity of the compensator; the solenoid valve is connected to the inner wall of the lower bottom assembly, and the solenoid valve controls the opening and closing of the air cavity flow channel of the compensator; the bottom of the scroll spring tensioner is connected to the inner wall of the lower bottom assembly, and the pull rope end of the scroll spring tensioner is connected to the top of the welded bellows assembly; the angular displacement sensor is arranged on the scroll spring tensioner; and the guide ring is connected to the top of the welded bellows assembly.

[0005] The above-mentioned compensation-liquid collection multifunctional compensator for the thermal control fluid circuit of a spacecraft also includes: a pin; wherein the angular displacement sensor is arranged on the scroll spring tensioner through the pin.

[0006] The above-mentioned compensation-liquid collection multifunctional compensator for the thermal control fluid circuit of the spacecraft also includes: an electrical connector; wherein the electrical connector is arranged on the outer wall of the lower bottom component; the electrical connector is respectively connected to the solenoid valve and the angular displacement sensor.

[0007] In the above-mentioned compensation-liquid collection multifunctional compensator for the thermal control fluid circuit of the spacecraft, the lower bottom assembly includes a bottom plate and an inflation valve; wherein the inflation valve is arranged at the position of the inflation hole opened in the bottom plate; the bottom of the storage tank body is connected to the bottom plate; the welded bellows assembly is connected to the bottom plate, and the space enclosed by the inner side of the welded bellows assembly and the bottom plate is the air cavity of the compensator; the solenoid valve is connected to the inner wall of the bottom plate; and the bottom of the volute spring tensioner is connected to the inner wall of the bottom plate.

[0008] In the above-mentioned compensation-liquid collection multifunctional compensator for the thermal control fluid circuit of the spacecraft, the inflation valve includes a gasket, a spring, a valve head, a plug, a plugging cap and a retaining ring; wherein the gasket is arranged at the bottom of the inflation hole; the plug is connected to the inflation hole port; the valve head is arranged inside the plug; the spring is arranged inside the valve head through the retaining ring, and the bottom of the spring is pressed against the gasket; the plugging cap is sleeved on the outer surface of the plug.

[0009] In the above-mentioned compensation-liquid collection multifunctional compensator for the thermal control fluid circuit of the spacecraft, the welded bellows assembly includes a lower connecting ring, a welded bellows, an upper connecting ring and a movable head; wherein, one end of the welded bellows is connected to the lower connecting ring, and the other end of the welded bellows is connected to the upper connecting ring; the top of the upper connecting ring is connected to the movable head; a circular ring protrusion is arranged on the inner side of the bottom of the upper connecting ring for supporting the circular arc part of the welded bellows to optimize the force on the diaphragm; a circular ring groove is arranged on the outer side of the upper connecting ring for embedding a guide ring; the lower connecting ring is connected to the lower bottom assembly, and a protrusion for welding and connecting to the welded bellows is arranged on the outer side of the upper layer of the lower connecting ring, and an arc protrusion for supporting the bellows diaphragm is arranged on the inner side of the upper layer of the lower connecting ring.

[0010] In the above-mentioned compensation-liquid collection multifunctional compensator for the thermal control fluid circuit of the spacecraft, the volute spring tensioner includes a volute spring with a bracket, a wheel and a pull rope; wherein the bracket of the volute spring with the bracket is connected to the base plate; the wheel is arranged on the bracket of the volute spring with the bracket; one end of the pull rope is connected to the wheel, and the other end of the pull rope is connected to the moving head; the angular displacement sensor is arranged on the wheel.

[0011] In the above-mentioned compensation-liquid collection multifunctional compensator for the thermal control fluid circuit of a spacecraft, the tank body includes an upper head and a cylindrical section; wherein the upper head and the cylindrical section are connected; and the cylindrical section is connected to the lower bottom assembly.

[0012] In the compensation-liquid collection multifunctional compensator for the thermal control fluid circuit of the spacecraft, the guide ring is a polytetrafluoroethylene ring, which has an opening and is fixed to the upper connecting ring by screws. There is a gap of 0.25 to 0.5 mm between the outer side of the guide ring and the inner side of the tank body.

[0013] The above-mentioned compensation-liquid collection multifunctional compensator for the thermal control fluid circuit of the spacecraft also includes: an electrical connector sealing ring; wherein the electrical connector is arranged on the outer wall of the lower base component through the electrical connector sealing ring.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] (1) The present invention embeds a scroll spring tensioner and a solenoid valve in the compensator, which can realize the active discharge of gas in the compensator air cavity so that it can be used as a liquid collection tank for a long time, expand the function of the compensator, realize the recovery of fluid circuit working fluid and product integrated design, so that the spacecraft thermal control fluid circuit can be partially subjected to ultra-low temperature environment;

[0016] (2) The present invention embeds the flow channel inside the compensator bottom plate, avoiding external pipelines and achieving efficient use of space;

[0017] (3) The compensator gas cavity of the present invention is provided with an inflation cut-off valve, which is inflated by an external gas source, and the gas in the liquid cavity is recovered by the loop gas collector, so that the adjustment of the compensation function of the compensator from the liquid collection tank to the compensator can be realized on-orbit.

[0018] (4) The present invention aims to achieve the lightweight and integrated design goals of the spacecraft thermal control system, meet the on-orbit and landing mission requirements of the spacecraft thermal control fluid circuit, expand the spacecraft's environmental tolerance range, and extend the spacecraft's service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0020] Figure 1 It is a structural schematic diagram of a compensation-liquid collection multifunctional compensator for a thermal control fluid circuit of a spacecraft provided by an embodiment of the present invention;

[0021] Figure 2It is another structural schematic diagram of a compensation-liquid collection multifunctional compensator for a thermal control fluid circuit of a spacecraft provided by an embodiment of the present invention;

[0022] Figure 3 It is another structural schematic diagram of a compensation-liquid collection multifunctional compensator for a thermal control fluid circuit of a spacecraft provided by an embodiment of the present invention;

[0023] Figure 4 is a schematic diagram of the structure of the lower base assembly provided by an embodiment of the present invention;

[0024] FIG5( a ) is a schematic diagram of the upper surface of a base plate provided by an embodiment of the present invention;

[0025] FIG5( b ) is a schematic diagram of the lower surface of the base plate provided in an embodiment of the present invention;

[0026] Figure 6 is a schematic structural diagram of a welded bellows assembly provided by an embodiment of the present invention;

[0027] Figure 7 is a schematic cross-sectional view of an upper connecting ring provided in an embodiment of the present invention;

[0028] Figure 8 is a schematic diagram of the structure of the lower connecting ring provided by an embodiment of the present invention;

[0029] FIG9( a) is a cross-sectional view of a guide ring provided in an embodiment of the present invention;

[0030] FIG9( b ) is a perspective view of a guide ring provided in an embodiment of the present invention;

[0031] Fig.10 is a schematic diagram of the storage tank structure space provided by an embodiment of the present invention;

[0032] Fig.11 It is a schematic diagram of the valve head structure provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0033] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to be able to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features described in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0034] Adding a compensator device to the fluid circuit can push the compensator liquid cavity to squeeze the working fluid into the circuit or absorb the working fluid into the circuit to stabilize the circuit pressure fluctuation based on the compressibility and expansion of the gas when the circuit pressure fluctuates. The working fluid in the fluid circuit must avoid low-temperature environment, which requires the circuit system to have a working fluid recovery function. Currently, spacecraft are developing in the direction of integration and lightweight, and the mission requirements after the spacecraft lands require that the active thermal control fluid circuit can still operate normally after experiencing an ultra-low temperature environment to ensure the normal operation of the spacecraft's high-power electronic products. Therefore, the use of integrated design to expand product functions is of great significance to improving the efficiency of the spacecraft thermal control fluid circuit and extending the service life of the spacecraft after landing.

[0035] Based on the working principle of the compensator and the idea of ​​fluid circuit recovery, a compensation-liquid collection multifunctional compensator for spacecraft thermal control fluid circuit is proposed. The compensator can realize the compensation function of the compensator to stabilize the circuit pressure fluctuation when the spacecraft is in orbit. At the same time, it has a mode switching function. After adjusting to the liquid collection tank mode, the fluid working medium in the exposed parts and pipelines of the spacecraft can be recovered to avoid the circuit working medium in an ultra-low temperature environment. This can solve the storage problem of the spacecraft thermal control fluid circuit in an ultra-low temperature environment, improve the tolerance environment range of the thermal control fluid circuit, and thus extend the service life of the spacecraft.

[0036] Figure 1 It is a structural schematic diagram of a compensation-liquid collection multifunctional compensator for a thermal control fluid circuit of a spacecraft provided by an embodiment of the present invention; Figure 2 It is another structural schematic diagram of a compensation-liquid collection multifunctional compensator for a thermal control fluid circuit of a spacecraft provided by an embodiment of the present invention; Figure 3 1 is another structural schematic diagram of a compensation-liquid collection multifunctional compensator for a spacecraft thermal control fluid circuit provided by an embodiment of the present invention. Figure 1 , Figure 2 and Figure 3 As shown, the compensation-liquid collection multifunctional compensator for the thermal control fluid circuit of the spacecraft includes: a lower bottom component 1, a welding bellows component 2, a scroll spring tensioner 3, a solenoid valve 4, an angular displacement sensor 5, a tank body 6 and a guide ring 7; wherein, the bottom of the tank body 6 is connected to the lower bottom component 1; the welding bellows component 2 is arranged inside the tank body 6, and the welding bellows component 2 is connected to the lower bottom component 1; the space enclosed by the inner side of the welding bellows component 2 and the lower bottom component 1 is the air cavity of the compensator, and the space enclosed by the welding bellows component 2 and the tank body is the liquid cavity of the compensator; the solenoid valve 4 is connected to the inner wall of the lower bottom component 1, and the solenoid valve 4 controls the opening and closing of the air cavity flow channel of the compensator; the bottom of the scroll spring tensioner 3 is connected to the inner wall of the lower bottom component 1, and the pull rope end of the scroll spring tensioner 3 is connected to the top of the welding bellows component 2; the angular displacement sensor 5 is arranged on the scroll spring tensioner 3; and the guide ring 7 is connected to the top of the welding bellows component 2.

[0037] like Figure 2 As shown, the compensation-liquid collection multifunctional compensator for the thermal control fluid circuit of the spacecraft also includes: a pin 8; wherein the angular displacement sensor 5 is arranged on the scroll spring tensioner 3 through the pin 8.

[0038] like Figure 2 As shown, the compensation-liquid collection multifunctional compensator for the thermal control fluid circuit of the spacecraft also includes: an electrical connector 16; wherein the electrical connector 16 is arranged on the outer wall of the lower base component 1; the electrical connector 16 is respectively connected to the solenoid valve 4 and the angular displacement sensor 5.

[0039] like Figure 4 ,like Figure 5a and Figure 5b As shown, the lower bottom assembly 1 includes a bottom plate 110 and an inflation valve; wherein the inflation valve is arranged at the position of the inflation hole opened in the bottom plate 110; the bottom of the storage tank body 6 is connected to the bottom plate 110; the welded bellows assembly 2 is connected to the bottom plate 110, and the space enclosed by the inner side of the welded bellows assembly 2 and the bottom plate 110 is the air cavity of the compensator; the solenoid valve 4 is connected to the inner wall of the bottom plate 110; and the bottom of the scroll spring tensioner 3 is connected to the inner wall of the bottom plate 110.

[0040] like Figure 4 and Fig.11 As shown, the inflation valve includes a gasket 111, a spring 112, a valve head 113, a plug 114, a plugging cap 115 and a retaining ring 116; wherein, the gasket 111 is arranged at the bottom of the inflation hole; the plug 114 is connected to the inflation hole port; the valve head 113 is arranged inside the plug 114; the spring 112 is arranged inside the valve head 113 through the retaining ring 116, and the bottom of the spring 112 is pressed against the gasket 111; the plugging cap 115 is sleeved on the outer surface of the plug 114.

[0041] like Figure 6 , Figure 7 and Figure 8 As shown, the welding bellows assembly 2 includes a lower connecting ring, a welding bellows, an upper connecting ring and a movable head; wherein, one end of the welding bellows is connected to the lower connecting ring, and the other end of the welding bellows is connected to the upper connecting ring; the top of the upper connecting ring is connected to the movable head; a circular ring protrusion is arranged on the inner side of the bottom of the upper connecting ring for supporting the circular arc part of the welding bellows to optimize the stress of the diaphragm; a circular ring groove is arranged on the outer side of the upper connecting ring for embedding the guide ring 7; the lower connecting ring is connected to the lower bottom assembly 1, and a protrusion for welding connection with the welding bellows is arranged on the outer side of the upper layer of the lower connecting ring, and an arc protrusion for supporting the bellows diaphragm is arranged on the inner side of the upper layer of the lower connecting ring.

[0042] The welded bellows is welded to the upper and lower connecting rings on both sides of the axial direction, and the upper connecting ring is welded to the moving head. A connecting piece is welded to the inner center of the moving head, and a threaded blind hole for threaded connection is provided on the connecting piece. The welded bellows assembly is located in the inner cavity surrounded by the storage tank body and the bottom plate. The lower connecting ring of the welded bellows assembly is fixedly connected to the bottom plate by screws, and the lower connecting ring is provided with a local groove at the outlet of the flow channel in the bottom plate to ensure the gas and liquid flow channels. A non-metallic guide ring is arranged on the outside of the upper connecting ring to support the welded bellows assembly and guide it when the bellows is axially compressed and the moving head moves. The seal at the bottom fixing screw of the welded bellows adopts an end face seal of a non-metallic sealing ring inside and outside the screw based on the bottom plate sealing groove. The inner side of the screw is sealed to seal the compensator gas cavity and the external environment of the compensator, and the outer side of the screw is sealed to seal the compensator liquid cavity and the external environment of the compensator, so as to prevent the gas and liquid cavity working fluids from leaking to the external environment of the compensator through the gap between the lower connecting ring of the welded bellows assembly and the bottom plate-the screw hole.

[0043] The space enclosed by the inner side of the welded bellows assembly and the bottom plate is the air cavity of the compensator, and the space enclosed by the outer side of the welded bellows assembly and the tank body is the liquid cavity of the compensator. The air and liquid cavities can be connected through the flow channel embedded in the bottom plate, and a solenoid valve 4 is provided at the flow channel opening of the compensator air cavity to control the on-off. The solenoid valve and the bottom plate are connected by a plunger and fixed with screws. The plunger connection is provided with 2 static seals, 1 on the end face and 1 in the radial direction, to prevent the working fluid in the flow channel from communicating with the gas in the compensator air cavity through the gap between the solenoid valve and the bottom plate. The bottom of the inner cavity of the compensator A scroll spring tensioner 3 is also arranged on the plate. The tensioner bracket is fixed to the compensator bottom plate by screws. A section of pull rope is wound on the central wheel of the tensioner, and the end of the pull rope is connected to the connecting piece of the moving head by threading; an angular displacement sensor 5 is arranged at one end of the central axis of the tensioner, and an opening interface is provided on the compensator bottom plate as a wire passage. An electrical connector 16 is arranged on the outside of the interface for external power supply and signal acquisition, and the wires on the inside of the interface are respectively connected to the angular displacement sensor and solenoid valve matching the scroll spring tensioner.

[0044] There is a liquid circuit interface on the top and side bottom of the compensator tank body, the top is the liquid circuit inlet, and the side bottom is the liquid circuit outlet. There are two interfaces on the bottom plate of the compensator, an electrical interface and an inflation cut-off valve interface. The electrical interface can be used to power and monitor the status of the internal angular displacement sensor and solenoid valve of the compensator, and the air cavity of the compensator can be inflated and deflated through the inflation cut-off valve interface. The angular displacement sensor is used to feedback the displacement signal of the scroll spring tensioner, and the solenoid valve is used to control the flow channel to discharge the gas in the air cavity into the liquid cavity.

[0045] The free state of the welded bellows is the stretched state (no axial compression displacement), and the free state of the scroll spring tensioner is the fully stretched recovery. When the compensator works normally, the moving head in the bellows assembly is in the middle equilibrium position along the axis of the bellows. The welded bellows is compressed to a certain extent, and the scroll spring tensioner exerts a certain pulling force on the moving head. For the moving head, the axial force generated by the liquid cavity pressure on the outside of the welded bellows, the pulling force of the scroll spring tensioner and the rebound force generated by the stiffness of the welded bellows, and the axial force generated by the air cavity pressure on the inside of the welded bellows are balanced.

[0046] like Figure 1 As shown, the volute spring tensioner 3 includes a volute spring with a bracket, a wheel and a pull rope; wherein, the bracket of the volute spring with a bracket is connected to the base plate; the wheel is arranged on the bracket of the volute spring with a bracket; one end of the pull rope is connected to the wheel, and the other end of the pull rope is connected to the moving head; the angular displacement sensor 5 is arranged on the wheel.

[0047] like Fig.10 As shown, the tank body 6 includes an upper head and a cylindrical section; wherein the upper head and the cylindrical section are connected; and the cylindrical section is connected to the lower bottom assembly 1. The tank body is a cylindrical structure with an upper head, and a flange is provided on the outer edge of the bottom. The bottom plate is a disc structure with a flange. The tank body and the bottom plate are connected by bolt flanges and sealed by a non-metallic sealing ring end face based on the bottom plate sealing groove. The seal is a seal between the compensator liquid cavity and the external environment of the compensator to prevent the liquid cavity working fluid from leaking to the external environment of the compensator through the gap between the tank body and the bottom plate. The tank body and the bottom plate enclose a portion of the inner cavity of the compensator. An inflation cut-off valve with a self-locking function is integrated on the bottom plate. The compensator gas cavity can be inflated and deflated through the inflation cut-off valve outside the compensator using matching tooling.

[0048] As shown in FIG. 9( a ) and FIG. 9( b ), the guide ring 7 is a polytetrafluoroethylene ring having an opening and fixed to the upper connecting ring by screws. There is a gap of 0.25 to 0.5 mm between the outer side of the guide ring 7 and the inner side of the tank body.

[0049] Specifically, the compensation-liquid collecting multifunctional compensator for the thermal control fluid circuit of the spacecraft includes: a lower bottom assembly 1, a welded bellows assembly 2, a vortex spring tensioner 3, a solenoid valve 4, an angular displacement sensor 5, a tank body 6, a guide ring 7, a pin 8, a tank body-bottom plate connecting bolts 9, a welded bellows assembly-bottom plate connecting screws 10, a vortex spring tensioner mounting screws 11, a solenoid valve mounting screws 12, a bottom plate sealing ring 13, a solenoid valve sealing ring 15, an electrical connector 16, an electrical connector sealing ring 17, and an electrical connector mounting screw 18.

[0050] The lower bottom assembly 1 is composed of a bottom plate 110, a gasket 111, a spring 112, a valve head 113, a plug 114, a plug cap 115, a retaining ring 116, and sealing rings 117, 118, and 119. The top and side of the valve head 113 are arranged with flow channels. The spring 112 in the inner cavity of the valve head 113 cooperates with the retaining ring 116 and the gasket 111 to support the valve head 113 to compress the sealing ring 117 to form a static seal. The plug 114 is installed on the other side of the bottom plate 110. After the plug cap 115 is threadedly connected and tightened with the bottom plate 110, the sealing rings 118 and 119 are compressed to form a seal. After removing the plug cap 115 and the plug 114, the valve head 113 can be pushed by the ejector pin to compress the spring 112, thereby forming a gas Filling and discharging flow channels; the bottom plate 110 has O-ring grooves, screw holes, embedded flow channels, solenoid valve mounting platforms and scroll spring tensioner mounting platforms on the inner side of the compensator. A circle of bolt holes is arranged on the circumference of the bottom plate. Three O-ring grooves are arranged from the outside to the inside. The O-ring in the outermost groove is placed and compressed by the bottom plate and the tank body to form a seal between the outer liquid cavity of the compensator bellows and the external environment of the compensator. The O-ring in the middle groove is compressed by the bottom plate and the lower connecting ring to form a static seal between the compensator liquid cavity and the external environment, avoiding To prevent the liquid working fluid from leaking through the gap between the lower connecting ring and the bottom plate and the screw hole, the innermost groove O-ring is compressed by the bottom plate and the lower connecting ring to form a static seal between the inner air cavity of the compensator bellows and the external environment of the compensator; a circle of screw through holes is arranged in the circumferential direction between the two inner O-rings, which are used to connect the bottom plate and the lower connecting ring through the screw holes for fixation; the inner plane of the O-ring groove is arranged with a scroll spring tensioner installation platform and a solenoid valve installation platform. The two platforms are independent and parallel to the plane, and the platforms are Blind screw holes are arranged for fixing the scroll spring tensioner and the solenoid valve, and the solenoid valve mounting platform is also provided with a flow channel for connecting the mechanical interface of the solenoid valve. The flow channel is embedded in the base plate and connected to the opening between the outermost O-ring groove and the middle O-ring groove of the base plate, which is used as a flow channel for gas to be discharged into the liquid cavity; an electrical connector interface is arranged on the base plate between the scroll spring tensioner and the solenoid valve mounting platform, which is used to supply power, monitor the status and regulate the scroll spring tensioner and the solenoid valve in the inner cavity outside the compensator.

[0051] The welded bellows assembly 2 is composed of a lower connecting ring, a welded bellows, an upper connecting ring, a moving head, and a connecting piece. The lower connecting ring is a circular ring plate, on which are provided blind holes for installing screws, bosses for welding the welded bellows, and bosses for supporting the arc section of the bellows; the welded bellows is a bellows formed by stamping a metal strip corrugated diaphragm along the inner and outer edges, which can produce a large axial displacement, and the two ends of the bellows are respectively welded to the upper connecting ring and the lower connecting ring on the outer circle; the upper connecting ring is a circular ring, the upper side of the circular ring is welded to the moving head, the outer edge of the lower side of the circular ring is welded to the bellows, a circular ring protrusion is provided on the inner side of the bottom of the upper connecting ring, which is used to support the arc part of the bellows to optimize the force of the diaphragm, and a circular ring groove is provided on the outer side of the upper connecting ring for embedding the guide ring. The bottom is provided with a boss for welding with the welded bellows and a boss for supporting the arc segment of the bellows diaphragm, and a groove is arranged on the outer side of the upper connecting ring for placing the guide ring; the moving head is a stamped thin plate head; a bulge is arranged on the inner side of the lower connecting ring for arranging a blind hole for screws connected with the bottom plate, a bulge for welding connection with the bellows is arranged on the outer side of the upper layer of the lower connecting ring, and an arc bulge supporting the bellows diaphragm is arranged on the inner side of the upper layer, which is used to better bear the force when the bellows is axially compressed;

[0052] The scroll spring tensioner 3 is a scroll spring with a bracket, which is provided with a wheel for winding a pull rope. One end of the pull rope is connected to the wheel, and the other end is connected to the moving head. The rebound force of the scroll spring is used to generate tension on the moving head. An angular displacement sensor 5 is provided at one end of the tensioner shaft to monitor the displacement of the tensioner rope. The tensioner is provided with a limit plate to stop the movement of the tensioner when the displacement of the pull rope is large enough to avoid excessive displacement of the moving head and scratches.

[0053] A solenoid valve is a valve that relies on electromagnetic force to automatically open and close to control the flow channel.

[0054] The angular displacement sensor 5 is a displacement sensor for feeding back displacement signals, which is mounted on one end of the rotating shaft of the scroll spring tensioner through a pin 8 and moves along with the rotating shaft.

[0055] The tank body 6 is a cylindrical structure with a cover. Interfaces are arranged at the center and the bottom side of the upper head of the tank body 6, which are used to connect the liquid cavity inside the compensator tank body with the thermal control fluid circuit; the cylindrical section inside the tank body 6 and the upper head are arranged with grooves, which play a role in preventing the formation of dead space and residual working fluid between the outer side of the bellows and the inner side of the tank body 6, and between the moving head and the upper head of the tank body. The side of the bottom of the tank body 6 is arranged with a flange and bolt holes, which are connected with the bottom plate 110 by the tank body-bottom plate connecting bolts 9 and sealed by the bottom plate sealing ring 13 and the groove on the bottom plate;

[0056] The guide ring 7 is a polytetrafluoroethylene ring with an opening and fixed to the upper connecting ring by screws. There is a gap of about 0.25 to 0.5 mm between its outer side and the inner side of the tank body. It is used to support and guide when one end of the moving head of the welded bellows assembly 2 moves axially.

[0057] The electrical connector 16 cooperates with the electrical connector sealing ring 17 and is installed on the electrical connector mounting boss on the outer side of the compensator lower bottom component 1 with the electrical connector mounting screw 18. The electrical connector wires in the compensator cavity are respectively connected to the angular displacement sensor and the solenoid valve.

[0058] The two ends of the bellows are respectively connected to the upper connecting ring and the lower connecting ring by welding, and the upper side of the upper connecting ring is then welded to the moving head. A polytetrafluoroethylene guide ring 7 is embedded on the outer side of the upper connecting ring. The guide ring 7 is connected to the upper connecting ring by small screws to form a welded bellows assembly 2.

[0059] When the base plate 110 is in a component state, the valve head 113, spring 112, O-ring 1e, retaining ring 116, gasket 111 and the like are installed on the upper side of the base plate to form an inflation cut-off valve, and the plug 114, O-rings 1i, 1j and plugging cap 115 are installed on the other side after the air cavity is inflated.

[0060] The scroll spring tensioner 3 and the solenoid valve 4 are installed on the mounting platform of the bottom plate 110 with screws. The solenoid valve 4 is connected to the embedded flow channel of the bottom plate 110 through the plunger interface. Two O-ring static seals (one end face + one radial) are used to achieve the isolation of the gas and liquid cavities at the interface of the solenoid valve.

[0061] The pull rope of the scroll spring tensioner 3 is connected to the connecting piece at the inner center of the moving head through a thread, and the bottom plate 110 and the lower connecting ring are fixed by screws 10. The two O-rings 13 are compressed through the contact plane between the bottom plate 110 and the lower connecting ring to form two static seals to ensure the sealing between the air cavity and the outside, and the liquid cavity and the outside of the compensator.

[0062] The compensator tank body 5 is connected to the bottom plate 110 by bolts 9 arranged in the outer circumferential direction. The contact plane between the tank body and the bottom plate compresses the outermost O-ring 13 to form a static seal to ensure the sealing of the compensator liquid chamber and the external environment.

[0063] The space enclosed by the outer side of the welding bellows assembly 2 and the inner side of the tank body 6 is the compensator liquid cavity, which is connected to the fluid circuit through a mechanical interface. The space enclosed by the lower bottom assembly 1 and the welding bellows assembly 2 is the compensator air cavity. The gas in the air cavity can be actively discharged to the liquid cavity through the electromagnetic valve in the air cavity through the embedded flow channel. The volume of the inner cavity of the welding bellows is reduced, and the circuit working medium is recovered to the compensator liquid cavity, which is in a state of gas and liquid coexistence:

[0064] The force on the welded bellows assembly is always in a balanced state. Assuming that the welded bellows is in a free state (axial compression displacement is 0) as the initial state, its constraint relationship is as follows:

[0065] P1·A+k·x=P2·A+F(x)

[0066] V=A·x

[0067] Among them, A is the equivalent cross-sectional area of ​​the welded bellows assembly, which is related to the inner and outer diameters of the bellows; P1 is the air cavity pressure; k is the axial compression stiffness of the bellows; x is the axial displacement of the bellows, which can be obtained by the output of the angular displacement sensor; P2 is the liquid cavity pressure; F(x) is the external output tension of the scroll spring tensioner, which is a function of the axial displacement (x); V is the volume of the working fluid compensated by the circuit and sucked into the compensator.

[0068] Effect: Through this formula, ① the volume of the working fluid remaining inside the compensator when it performs the compensation function and the volume of the working fluid recovered in the compensator when it performs the liquid collecting function can be calculated within a certain pressure range in combination with system requirements during the system design phase. The parameters of the bellows and tensioner can be iteratively adjusted to meet system requirements. ② Combined with calibration tests, real-time monitoring of product performance during operation can be achieved through angular displacement sensors.

[0069] like Figure 1 As shown, after the multifunctional compensator is assembled, the space enclosed by the welded bellows assembly 2 and the tank body 6 and the flow channel of the bottom plate 110 constitute the liquid chamber of the compensator (outside the bellows), and the space enclosed by the bellows assembly 2 and the bottom plate 110 is the air chamber of the compensator (inside the bellows). The liquid chamber of the compensator is filled with fluid, and the air chamber of the tank body 6 is filled with gas at a certain pressure. The volute spring tensioner 3 and the solenoid valve 4 are located in the air chamber of the compensator.

[0070] The axial force generated by the air cavity pressure, the tension of the scroll spring tensioner 3, and the axial force (smaller) formed by the stiffness of the bellows, reach a state of equilibrium with the axial force generated by the liquid cavity pressure. The free state of the scroll spring is the state of the pull rope being retracted, so the air cavity pressure of the compensator is greater than the liquid cavity pressure.

[0071] When the multifunctional compensator is used for compensation, the compensator liquid cavity is filled with working fluid, the moving head is in the middle position, the scroll spring has not completely recovered to a free state, and the compensator liquid cavity is connected to the thermal control fluid circuit. When the pressure of the circuit increases due to factors such as the increase in ambient temperature, the pressure of the compensator liquid cavity increases, the initial equilibrium state is broken, the gas in the air cavity is compressed, the bellows produces axial compression, the moving head moves downward, the compensator liquid cavity space increases, and the working fluid is sucked into the fluid circuit through the liquid circuit inlet. The working fluid pressure of the circuit decreases, so that the bellows and the moving head reach a new equilibrium state in the new position; when the pressure of the circuit decreases due to factors such as working fluid leakage, the pressure of the compensator liquid cavity decreases, the equilibrium state is broken, the gas in the compensator air cavity expands, the moving head moves upward, and the working fluid is squeezed into the circuit from the compensator liquid cavity, reaching equilibrium at the new pressure point to avoid the circuit pressure being too low.

[0072] When the multifunctional compensator is adjusted from the compensator mode to the liquid collecting tank mode, the electromagnetic valve 4 of the compensator air cavity is opened. Since the air cavity pressure is greater than the liquid cavity pressure, the air in the air cavity is discharged into the bottom plate flow channel through the electromagnetic valve 4, and finally through the opening of the lower connecting ring, the outer side of the bellows and the inner space of the tank body, and gathers on the upper side of the moving head and the inner space of the tank body upper cover. The air cavity pressure drops, and the scroll spring tensioner pulls the moving head downward. When the scroll spring approaches the limit position, the electromagnetic valve is closed, and the compensator air cavity maintains a small body. In the accumulation state, the compensator liquid chamber contains the bottom fluid medium and the upper layer contains gas. The fluid medium in the fluid circuit all flows back to the compensator liquid chamber to avoid the solidification and bursting of the pipeline by the medium in the ultra-low temperature environment outside the cabin. After the ultra-low temperature environment, the mechanical pump and other power devices connected to the compensator liquid chamber outlet suck the fluid medium from the bottom of the compensator liquid chamber and transport it to the fluid circuit, and return it to the compensator liquid chamber from the compensator liquid chamber inlet. The multifunctional compensator plays the function of a liquid collecting-storage tank to ensure the normal operation of the thermal control fluid circuit after the low temperature environment.

[0073] The multifunctional compensator proposed in the present invention has two working modes, namely, compensator and liquid collecting tank, and has high integration. The devices are respectively suitable for different environments of spacecraft in orbit and on landing. The main power is the gas pressure of the air cavity and the scroll spring. The devices have high reliability and low energy consumption. When the spacecraft is in orbit, the compensator can effectively reduce the pressure fluctuation of the spacecraft's on-orbit thermal control fluid circuit and compensate for the leakage of the working fluid in the on-orbit fluid circuit. After the spacecraft lands, the compensator working mode can be actively adjusted to the liquid collecting tank by controlling the solenoid valve. The working fluid in the fluid circuit flows to the compensator liquid cavity to avoid an ultra-low temperature environment, thereby ensuring that the spacecraft's active thermal control fluid circuit can still work normally after experiencing an ultra-low temperature environment, thereby extending the service life of the active thermal control fluid circuit system after the spacecraft lands.

[0074] The present invention embeds a scroll spring tensioner and a solenoid valve in the compensator, which can realize the active discharge of the gas in the compensator air cavity so that it can be used as a liquid collecting tank for a long time, expanding the function of the compensator, and realizing the recovery of the fluid in the fluid circuit and the integrated design of the product, so that the spacecraft thermal control fluid circuit can partially experience an ultra-low temperature environment; the present invention embeds a flow channel on the inner side of the compensator bottom plate, avoiding external pipelines and realizing efficient use of space; the compensator air cavity of the present invention is provided with an inflation shut-off valve, which is inflated by an external gas source, and the liquid cavity gas is recovered by the loop gas collector, so that the compensation function of the compensator can be adjusted from the liquid collecting tank to the compensator on-orbit; the present invention realizes the lightweight and integrated design goals of the spacecraft thermal control system, meets the on-orbit and landing mission requirements of the spacecraft thermal control fluid circuit, expands the spacecraft's environmental tolerance range, and extends the spacecraft's service life.

[0075] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A compensation-liquid collection multifunctional compensator for a spacecraft thermal control fluid circuit, characterized in that include: A lower base assembly (1), a welded bellows assembly (2), a scroll spring tensioner (3), a solenoid valve (4), an angular displacement sensor (5), a tank body (6) and a guide ring (7); wherein: The bottom of the storage tank body (6) is connected to the lower bottom assembly (1); The welded bellows assembly (2) is arranged inside the tank body (6), and the welded bellows assembly (2) is connected to the lower base assembly (1); The space enclosed by the inner side of the welded bellows assembly (2) and the lower base assembly (1) is the air cavity of the compensator, and the space enclosed by the welded bellows assembly (2) and the tank body is the liquid cavity of the compensator; The solenoid valve (4) is connected to the inner wall of the lower base component (1), and the solenoid valve (4) controls the opening and closing of the air cavity flow channel of the compensator; The bottom of the scroll spring tensioner (3) is connected to the inner wall of the lower base assembly (1), and the end of the pull rope of the scroll spring tensioner (3) is connected to the top of the welded bellows assembly (2); The angular displacement sensor (5) is arranged on the scroll spring tensioner (3); The guide ring (7) is connected to the top end of the welding bellows assembly (2).

2. The compensation-liquid collection multifunctional compensator for a spacecraft thermal control fluid circuit according to claim 1 is characterized in that Also includes: Pin (8); wherein, The angular displacement sensor (5) is arranged on the scroll spring tensioner (3) via the pin (8).

3. The compensation-liquid collection multifunctional compensator for a spacecraft thermal control fluid circuit according to claim 1 is characterized in that Also included: an electrical connector (16); wherein, The electrical connector (16) is arranged on the outer wall of the lower base component (1); The electrical connector (16) is connected to the solenoid valve (4) and the angular displacement sensor (5) respectively.

4. The compensation-liquid collection multifunctional compensator for a spacecraft thermal control fluid circuit according to claim 1, characterized in that: The lower base assembly (1) comprises a base plate (110) and an inflation valve; wherein: The inflation valve is arranged at the location of the inflation hole provided in the bottom plate (110); The bottom of the storage tank body (6) is connected to the bottom plate (110); The welded bellows assembly (2) is connected to the bottom plate (110), and the space enclosed by the inner side of the welded bellows assembly (2) and the bottom plate (110) is the air cavity of the compensator; The solenoid valve (4) is connected to the inner wall of the bottom plate (110); The bottom of the scroll spring tensioner (3) is connected to the inner wall of the bottom plate (110).

5. The compensation-liquid collection multifunctional compensator for a spacecraft thermal control fluid circuit according to claim 4, characterized in that: The inflation valve comprises a gasket (111), a spring (112), a valve head (113), a plug (114), a plug cap (115) and a retaining ring (116); wherein: The gasket (111) is arranged at the bottom of the inflation hole; The plug (114) is connected to the inflation hole port; The valve head (113) is arranged inside the plug (114); The spring (112) is arranged inside the valve head (113) through a retaining ring (116), and the bottom of the spring (112) is pressed against the gasket (111); The plugging cap (115) is sleeved on the outer surface of the plug (114).

6. The compensation-liquid collection multifunctional compensator for a spacecraft thermal control fluid circuit according to claim 1, characterized in that: The welded bellows assembly (2) comprises a lower connecting ring, a welded bellows, an upper connecting ring and a movable head; wherein: One end of the welded bellows is connected to the lower connecting ring, and the other end of the welded bellows is connected to the upper connecting ring; The top of the upper connecting ring is connected to the moving head; A circular protrusion is provided on the inner side of the bottom of the upper connecting ring, which is used to support the arc part of the welded bellows to optimize the stress of the diaphragm; The outer side of the upper connecting ring is provided with a circular groove for embedding the guide ring (7); The lower connecting ring is connected to the lower base assembly (1), the outer side of the upper layer of the lower connecting ring is provided with a protrusion for welding to the welding bellows, and the inner side of the upper layer of the lower connecting ring is provided with an arc protrusion for supporting the bellows diaphragm.

7. The compensation-liquid collection multifunctional compensator for a spacecraft thermal control fluid circuit according to claim 6, characterized in that: The scroll spring tensioner (3) comprises a scroll spring with a bracket, a wheel disc and a pull rope; wherein: The bracket of the spiral spring with bracket is connected to the bottom plate; The wheel disc is arranged on the bracket of the spiral spring with bracket; One end of the pull rope is connected to the wheel disc, and the other end of the pull rope is connected to the moving head; The angular displacement sensor (5) is arranged on the wheel disc.

8. The compensation-liquid collection multifunctional compensator for a spacecraft thermal control fluid circuit according to claim 1, characterized in that: The storage tank body (6) comprises an upper head and a cylindrical section; wherein: The upper head is connected to the cylindrical section; The cylindrical section is connected to the lower base component (1).

9. The compensation-liquid collection multifunctional compensator for a spacecraft thermal control fluid circuit according to claim 6, characterized in that: The guide ring (7) is a polytetrafluoroethylene ring, which has an opening and is fixed to the upper connecting ring by screws. There is a gap of 0.25-0.5 mm between the outer side of the guide ring (7) and the inner side of the storage box.

10. The compensation-liquid collection multifunctional compensator for a spacecraft thermal control fluid circuit according to claim 3, characterized in that It also includes: an electrical connector sealing ring (17); wherein, The electrical connector (16) is arranged on the outer wall of the lower base component (1) through the electrical connector sealing ring (17).

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