A standard liquid circuit expansion device for easy extravehicular operation by astronauts

Abstract

This invention relates to a standard device for extending the liquid circuit for easy extravehicular operation by astronauts, comprising an extension adapter and an extension housing. The extension adapter is the passive end, installed on the spacecraft cabin and launched with the spacecraft. The extension housing is the active end, installed by the astronaut after exiting the spacecraft and attached to the extension adapter. The extension adapter and the extension housing are connected mechanically, electrically, and through liquid circuits. These interfaces are all standard interfaces, and the connection method is independent of the type of liquid circuit equipment installed inside the extension housing, such as pump assemblies, valve assemblies, and working fluid replenishment assemblies. The standard device for extending the liquid circuit of this invention features standardized interface design, adaptability for astronauts operating while wearing extravehicular spacesuits, no need for auxiliary tools, simple operation, and short operation time, and can meet the requirements for pressurized, leak-free operation of the extravehicular liquid circuit.

Description

Technical Field

[0001] This invention belongs to the technical field of spacecraft extravehicular fluid system technology, and relates to a standard device for expanding fluid systems to facilitate extravehicular operation by astronauts. Background Technology

[0002] During long-term operation in orbit, maintenance is an effective means of preventing or eliminating malfunctions and thus ensuring the longevity of spacecraft. Through on-orbit maintenance, the Mir space station extended its lifespan from the initial 5 years to 15 years, and the International Space Station has also conducted numerous on-orbit maintenance operations.

[0003] Current extravehicular maintenance (EVA) is mostly unmanned, typically using robotic arms to transport equipment to the maintenance point and servo motors to drive mechanical disconnection. Manned maintenance allows astronauts to perform complex actions, eliminating the need for large, high-precision automated docking systems, greatly improving operational flexibility and reducing mission difficulty. However, astronauts wearing EVA suits have limited visibility. To complete an EVA mission, in addition to considering general factors such as the microgravity environment and accessibility of the operating space, the ease of EVA maintenance must be a key consideration. Specialized designs should be developed to simplify operational steps and reduce operational requirements, thereby minimizing EVA time and increasing the success rate.

[0004] Extravehicular fluid circuit equipment, represented by the thermal control fluid loop, is a key focus of system maintenance. Maintenance operations for extravehicular fluid circuit equipment include mechanical connections, disconnection of pressurized fluid circuits, and electrical disconnection, making it a complex process involving mechanics, electrical systems, and fluid circuits. The International Space Station has conducted multiple extravehicular activities to replace faulty mechanical pump assemblies. These mechanical pump assemblies weigh 355 kg and measure 1265 mm × 1729 mm × 894 mm, requiring two astronauts to operate with tools, resulting in a repair and replacement time of approximately 4 hours and extending the mission's extravehicular activity time. Summary of the Invention

[0005] The technical problem solved by this invention is to overcome the shortcomings of the prior art and propose a standard device for expanding the liquid circuit that is easy for astronauts to operate outside the cabin. It has the characteristics of standardized interface design, adaptability to operation by astronauts wearing extravehicular spacesuits, no need for auxiliary tools, simple operation, and short time consumption. It can meet the requirements of pressurized and leak-free operation of the extravehicular liquid circuit.

[0006] The solution of the present invention is: a standard device for expanding the liquid circuit that is easy for astronauts to operate outside the cabin, including an expansion adapter and an expansion housing. The expansion adapter is the passive end, which is installed on the spacecraft cabin and launched with the cabin. The expansion housing is the active end, which is installed on the expansion adapter by the astronaut after exiting the cabin.

[0007] The expansion adapter includes a guide assembly, a mechanical locking assembly, a circuit assembly, and a hydraulic circuit assembly, while the expansion chassis includes a guide device, a mechanical locking device, a circuit connection device, and a hydraulic circuit connection device.

[0008] The guide component is equipped with positioning pin holes;

[0009] The mechanical locking assembly is equipped with a hook and a hook base;

[0010] The circuit assembly is equipped with a floating electrical connector passive end;

[0011] The hydraulic circuit assembly is equipped with a passive terminal of a hydraulic circuit floating disconnector.

[0012] The guide device is equipped with a positioning pin, which mates with the positioning pin hole to achieve precise positioning during docking.

[0013] The mechanical locking device is equipped with a locking hook and a locking pin. The locking hook cooperates with the locking pin in the mechanical locking assembly, and the locking pin cooperates with the locking seat in the mechanical locking assembly to achieve mechanical locking.

[0014] The circuit connection device is equipped with a floating electrical connector active end, which drives the lead screw to move by rotating the handwheel and engage with the floating electrical connector passive end in the circuit assembly.

[0015] The liquid circuit connection device is equipped with the active end of the liquid circuit floating disconnector, which can be plugged into and connected with the passive end of the liquid circuit floating disconnector in the liquid circuit assembly by pulling the assist wrench.

[0016] Furthermore, the expansion adapter body is divided into top, bottom, front, back, left, and right sides;

[0017] The guide components are located at the front and have positioning pin holes distributed on the left and right sides;

[0018] Mechanical locking components are arranged on the top and bottom surfaces. N hooks are provided on both sides of the front end of the top surface, and N hook seats are provided on the bottom surface at a preset distance from the main body.

[0019] The circuit components are arranged on the front and top surfaces. There are two electrical connectors on the front, one for high-voltage power supply and the other for low-voltage power supply and signal acquisition, which connect to the spacecraft's cable network. The passive end of the floating electrical connector is located on the top surface.

[0020] The fluid circuit assembly is located on the front and top surfaces. The front surface has M fluid circuit pipe joints that connect to the fluid circuit pipeline of the spacecraft. The top surface has M passive terminals of the fluid circuit floating disconnectors, with each fluid circuit pipe joint corresponding to a passive terminal of the fluid circuit floating disconnector. N is an integer not less than 1, and M is an integer not less than 3.

[0021] Furthermore, the expansion chassis is divided into a top surface, front surface, rear surface, left side surface, and right side surface;

[0022] The guide device is located at the front and has positioning pins distributed on the left and right. When docking, the left and right sides of the expansion chassis are used for rough positioning first, and then the positioning pins at the front of the expansion chassis are inserted into the positioning pin holes on the expansion adapter to achieve fine positioning.

[0023] The mechanical locking device is arranged around the top surface, including N locking hooks that engage with N locking pins on the expansion adapter; it also includes N locking pins that engage with N locking seats on the expansion adapter to unlock and lock.

[0024] The circuit connection device is arranged on the top surface, including one floating electrical connector;

[0025] The liquid circuit connection device is arranged at the front, with a total of M active ends of the liquid circuit floating disconnectors. Each active end of the floating disconnector is equipped with a rocker-slider mechanism with an assist wrench. When the assist wrench is turned, the active end of the liquid circuit floating disconnector moves linearly until it is connected and locked to the passive end of the liquid circuit floating disconnector, thus realizing the connection of the liquid circuit.

[0026] Furthermore, the floating electrical connector includes an electrical connector handwheel, a handwheel seat, a lead screw, a nut, an electrical connector bracket, and a floating electrical connector active end;

[0027] The electrical connector handwheel and handwheel seat are locked by a keyway and spring. When locked, pull the electrical connector handwheel upward to disengage the key from the slot, rotate the electrical connector handwheel, drive the lead screw to rotate and drive the nut to move linearly. The nut drives the electrical connector bracket to move downward, and at the same time drives the active end of the floating electrical connector to move, and connect with the passive end of the floating electrical connector in the expansion adapter to realize the circuit connection.

[0028] Furthermore, the bottom of the fluid circuit equipment installed inside the expansion chassis is fixed to the side panel of the chassis with screws. After the expansion chassis and the expansion adapter are installed together, they form a complete cubic structure.

[0029] Furthermore, the top surface of the extended enclosure is equipped with a handle for astronauts to grip during operation.

[0030] Furthermore, the positioning pin holes of the expansion adapter are designed with tapered holes, one of which is elliptical, for fine-tuning the position of the expansion adapter after it is connected to the expansion chassis.

[0031] Furthermore, the left and right sides of the expansion chassis are equipped with a hollowed-out structure with rounded edges to protect the expansion adapter during docking.

[0032] Furthermore, the handwheel rotation torque of the electrical connector is no greater than 1.4 N·m, and the operating torque of the power wrench is no greater than 70 N·m.

[0033] Furthermore, heating elements are attached to the inner surface of the extended chassis for insulation.

[0034] The advantages of this invention compared to the prior art are:

[0035] (1) The present invention enables astronauts to achieve mechanical, electrical and liquid connection between the expansion chassis and the expansion adapter by means of a guide, locking mechanism, circuit and liquid connection. The astronauts can also perform maintenance, replacement and expansion of key liquid circuit equipment through operation, thus achieving a long service life of the liquid circuit system.

[0036] (2) The device of the present invention does not require any tools during operation, is simple to operate, and saves time and effort.

[0037] (3) The present invention adopts a standardized interface, which can support multiple liquid circuits and circuits, and realizes the standardization of cabin installation interface, the standardization of liquid circuit equipment interface to be replaced, the standardization of astronaut operation, and the standardization of packaging and transportation, and has universality. Attached Figure Description

[0038] Figure 1 A schematic diagram of the extended standard device;

[0039] Figure 2 This is a diagram of the expansion adapter structure.

[0040] Figure 3 To expand the chassis structure diagram;

[0041] Figure 4 To expand the structural diagram after the standard device is docked and locked;

[0042] Figure 5 To expand the standard device docking and locking, internal circuit and liquid circuit docking structure diagram;

[0043] Figure 6 To expand the chassis lock pin diagram;

[0044] Figure 7 Diagram of the expansion adapter hook;

[0045] 1-Extension adapter body 10-Extension chassis body 19-Nuts

[0046] 2-Hook base 11-Locking pin 20-Electrical connector bracket

[0047] 3-Floating disconnector passive end; 12-Handle; 21-Floating electrical connector active end

[0048] 4-Floating connector passive end 13-Locking hook

[0049] 5-Hydraulic pipe connector 14-Electrical connector handwheel

[0050] 6-Low-voltage electrical connector 15-Positioning pin

[0051] 7-High voltage connector 16-Assist wrench

[0052] 8-Locking pin hole 17-Handwheel seat

[0053] 9-Hook pin 18-Screw Detailed Implementation

[0054] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0055] This invention proposes a standard device for extending the liquid circuit, which is convenient for astronauts to operate outside the spacecraft. It comprises an extension adapter and an extension housing. The extension adapter is the passive end, installed on the spacecraft cabin and launched with the spacecraft. The extension housing is the active end, installed by the astronaut after exiting the spacecraft and attached to the extension adapter. The extension adapter and the extension housing are connected mechanically, electrically, and through liquid circuits. These interfaces are all standard interfaces, and the connection method is independent of the type of liquid circuit equipment installed inside the extension housing, such as pump assemblies, valve assemblies, or working fluid replenishment assemblies.

[0056] The expansion adapter includes a guide assembly, a mechanical locking assembly, a circuit assembly, and a hydraulic circuit assembly; the expansion chassis includes a guide device, a mechanical locking device, a circuit connection device, and a hydraulic circuit connection device.

[0057] The guide component is equipped with two positioning pin holes, which cooperate with two positioning pins in the guide device to achieve precise positioning during docking;

[0058] The mechanical locking assembly is equipped with two hooks and two hook seats. The hooks engage with the two locking hooks in the mechanical locking device, and the hook seats engage with the locking pins in the mechanical locking device to achieve mechanical locking.

[0059] The circuit assembly is equipped with a passive terminal of a floating electrical connector, which cooperates with the active terminal of a floating electrical connector in the circuit connection device to achieve circuit connection.

[0060] The liquid circuit assembly is equipped with three passive ends of the liquid circuit floating disconnector, which cooperate with the active ends of the liquid circuit floating disconnector in the liquid circuit connection device to realize liquid circuit connection.

[0061] The guide device is equipped with two positioning pins, which cooperate with the two positioning pin holes of the guide assembly to achieve precise positioning during docking;

[0062] The mechanical locking device is equipped with two locking hooks and two locking pins. The locking hooks cooperate with the two locking pins in the mechanical locking assembly, and the locking pins cooperate with the locking seat in the mechanical locking assembly to achieve mechanical locking.

[0063] The circuit connection device is equipped with a floating electrical connector active end, which drives the lead screw to move by rotating the handwheel and engage with a floating electrical connector passive end in the circuit assembly.

[0064] The liquid circuit connection device is equipped with three active ends of liquid circuit floating disconnectors. By pulling the assist wrench, it can be plugged and connected with the passive ends of the three liquid circuit floating disconnectors in the liquid circuit assembly.

[0065] (a) Expansion Adapter

[0066] like Figure 1 , Figure 2 As shown, the expansion adapter includes an expansion adapter body 1, a guide assembly, a mechanical locking assembly, a circuit assembly, and a hydraulic circuit assembly.

[0067] The main body of the extension adapter 1 is a cuboid structure, consisting of six panels: top, bottom (mounting surface), front, back, left side, and right side.

[0068] The guide components are arranged on the front panel, such as Figure 1 It includes two raised guide positioning blocks distributed on the left and right, and the guide positioning blocks are provided with positioning pin holes 8, which are used to cooperate with the positioning pins 15 in the expansion chassis to achieve guidance and positioning during docking.

[0069] Mechanical locking components are arranged on the top and bottom surfaces. Two hooks 9 are located on both sides of the front end of the top surface, which engage with two locking hooks 13 of the expansion chassis to achieve initial locking. Two hook seats 2 are located at a certain distance from the main body on the bottom surface, which engage with two locking pins 11 of the expansion chassis to achieve mechanical locking. The locking pin structure of the expansion chassis is as follows... Figure 6 As shown, the hook structure of the expansion adapter is as follows: Figure 7 As shown.

[0070] The circuit components are arranged on the front panel and top surface. The front panel has two electrical connectors 6 and 7, one for high-voltage power supply and the other for low-voltage power supply and signal acquisition, which connect to the spacecraft's cable network. The top surface has a floating electrical connector passive end 4, which connects to the floating electrical connector active end 21 in the expansion chassis to achieve circuit connectivity.

[0071] The fluid circuit assembly is located on the front panel and top surface. The front panel has three fluid circuit connectors 5, which are connected to the fluid circuit pipeline of the spacecraft; the top surface has three passive ends 3 of the fluid circuit floating disconnector, which are used to connect to the active ends of the fluid circuit floating disconnector in the expansion chassis to achieve fluid circuit connectivity; each fluid circuit connector 5 corresponds to one passive end 3 of the fluid circuit floating disconnector.

[0072] (II) Expansion Chassis

[0073] like Figure 1 , Figure 3 As shown, the expansion chassis includes a chassis body 10, a guide device, a mechanical locking device, an electrical connection device, and a hydraulic connection device.

[0074] The main body of the chassis 10 is divided into a top surface, front surface, rear surface, left side surface, and right side surface. The bottom surface of the internal liquid circuit equipment is connected and fixed to the side panel of the chassis with screws. After the expansion chassis and the expansion adapter are installed together, they form a complete cuboid structure. The left and right sides of the expansion chassis are provided with a hollow structure with smooth edges to protect the expansion adapter during docking. The top surface of the expansion chassis is provided with a handle 12 for astronauts to grip the product during operation.

[0075] The guide device is located on the front panel. During docking, rough positioning is first achieved using the left and right sides of the chassis, and then the two positioning pins 15 on the front panel of the chassis are inserted into the positioning pin holes 8 on the expansion adapter to achieve fine positioning;

[0076] The mechanical locking devices are located at the four corners of the top surface, with a total of four locking mechanisms. Two of them are locking hooks 13, which cooperate with the two hook pins 9 on the expansion adapter to lock; the other two are locking pins 11, which cooperate with the two hook seats 2 on the expansion adapter to unlock and lock.

[0077] The circuit connection device is arranged on the top surface, with a total of 1 floating electrical connector. The electrical connector handwheel 14 and handwheel seat 17 are locked by a keyway and spring; when locked, pull the handwheel 14 upward to disengage the key from the slot, rotate the handwheel 14, drive the lead screw 18 to rotate, drive the nut 19 to move linearly, the nut 19 drives the electrical connector bracket 20 to move downward, and at the same time drive the active end 21 of the floating electrical connector to move, and mate with the passive end 4 of the floating electrical connector in the expansion adapter.

[0078] The liquid circuit connection device is located on the front panel, consisting of three active ends of liquid circuit floating disconnectors. Each active end of the floating disconnector is equipped with an assist wrench 16 with a rocker-slider mechanism. When the astronaut pulls the assist wrench, the active end of the liquid circuit floating disconnector moves linearly until it is connected and locked in place with the passive end 3 of the liquid circuit floating disconnector. Depending on the equipment to be replaced installed inside the chassis, one, two, or three liquid circuit connection devices can be selected.

[0079] The internal and external structural diagrams after the standard device is docked and locked are as follows: Figure 4 , Figure 5 As shown.

[0080] Example 1

[0081] The dimensions of the expansion adapter body 1 are 480mm×100mm×158mm, and the dimensions of the expansion chassis body 10 are 530mm×395mm×425mm.

[0082] The expansion adapter positioning pin hole 8 is a tapered hole guide design, with the left positioning pin hole being circular and the right positioning pin hole being elliptical, used to achieve fine-tuning of the position after the expansion adapter is connected to the expansion chassis.

[0083] The distance between the extension adapter hook 2 and the rear panel of the extension adapter body is 255mm.

[0084] The expansion chassis shares a base plate with the internally installed equipment to be replaced. The left and right sides of the expansion chassis have cutouts where they meet the expansion adapters to further reduce weight.

[0085] The handle 12 on the top of the extended chassis is designed in a figure-eight shape to make it easier for astronauts to grip the product directly.

[0086] The two latches 13 in the expansion chassis have an unlocking and locking angle of 16°, and the two locking pins 11 have an unlocking and locking angle of 90°.

[0087] When the extended chassis electrical connector is locked, first pull the handwheel 14 upward to disengage it from the zero position limit groove, then rotate the handwheel 330° to fall into the locking limit groove. During this process, the active end 21 of the floating electrical connector and the passive end 4 of the floating electrical connector are connected.

[0088] The expansion chassis's 16-piece power wrench consists of a power lever and a wrench handle. The wrench handle is threaded onto the power lever and is mounted on a rail. It is usually stored in a storage bag.

[0089] Heating pads are attached to the inner surface of the extended chassis for heat preservation.

[0090] The standard device for expanding the hydraulic circuit achieves a positioning accuracy better than 1.5mm by utilizing the gap between the positioning pin and the positioning hole, as well as the precision of parts machining and assembly.

[0091] The handwheel 14 of the standard device for expanding the liquid circuit has a rotational torque of no more than 1.4 N·m, and the operating torque of the liquid circuit assist wrench 16 is no more than 70 N·m, both of which meet the operating force requirements of astronauts.

[0092] All parts of the standard fluid circuit expansion device have chamfered edges, and are marked with positioning pin hole positioning marks, locking hook connection positioning marks, locking pin connection positioning marks, and electrical connector connection positioning marks, and have passed ergonomic evaluation.

[0093] In summary, the present invention achieves leak-free operation of the external liquid circuit under pressure without requiring any tools during the operation process through the following technical solution:

[0094] The fluid loop extension standard unit consists of an extension adapter and an extension housing. The extension adapter has a simple structure and connects to the in-cabin fluid loop system, launching with the cabin. The moving parts and floating functions are all integrated into the extension housing, which houses the equipment to be replaced and is installed in orbit.

[0095] The standard device for expanding the liquid circuit achieves coarse positioning through its own structure, fine positioning through the positioning pin hole, and mechanical locking through the locking hooks and locking pins located at the four corners of the product.

[0096] The standard hydraulic circuit extension device enables the linear connection and disconnection of electrical connectors by rotating a handwheel, and enables the connection and disconnection of hydraulic circuit disconnectors by pulling an assist wrench.

[0097] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention by utilizing the methods and techniques disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

[0098] The contents not described in detail in this specification are common knowledge to those skilled in the art.

Claims

1. A fluid line extension standard for facilitating extravehicular operations by astronauts, comprising: It includes an expansion adapter and an expansion enclosure. The expansion adapter is the passive end, which is installed on the spacecraft cabin and launched with the cabin. The expansion enclosure is the active end, which is installed on the expansion adapter by the astronauts after they exit the cabin. The expansion adapter includes a guide assembly, a mechanical locking assembly, a circuit assembly, and a hydraulic circuit assembly, while the expansion chassis includes a guide device, a mechanical locking device, a circuit connection device, and a hydraulic circuit connection device. The guide component is provided with a positioning pin hole (8); The mechanical locking assembly is provided with a hook (9) and a hook seat (2); The circuit assembly is equipped with a floating electrical connector passive end (4). The liquid circuit assembly is equipped with a passive end of the liquid circuit floating disconnector (3). The guide device is equipped with a positioning pin (15) that cooperates with the positioning pin hole (8) to achieve precise positioning during docking; The mechanical locking device is provided with a locking hook (13) and a locking pin (11). The locking hook (13) cooperates with the hook pin (9) in the mechanical locking assembly, and the locking pin (11) cooperates with the hook seat (2) in the mechanical locking assembly to achieve mechanical locking. The circuit connection device is equipped with a floating electrical connector active end (21), which drives the lead screw to move by rotating the handwheel and engages with the floating electrical connector passive end (4) in the circuit assembly; The liquid circuit connection device is equipped with the active end of the liquid circuit floating disconnector. By pulling the power wrench, it can be inserted and connected with the passive end (3) of the liquid circuit floating disconnector in the liquid circuit assembly. The expansion adapter body is divided into top, bottom, front, back, left, and right sides; The guide assembly is located at the front and has positioning pin holes distributed on the left and right (8). Mechanical locking components are arranged on the top and bottom surfaces. N hooks (9) are provided on both sides of the front end of the top surface, and N hook seats (2) are provided at a preset distance from the body on the bottom surface. The circuit components are arranged on the front and top surfaces. There are two electrical connectors on the front surface, one for high-voltage power supply and the other for low-voltage power supply and signal acquisition, which are connected to the spacecraft's cable network. The top surface is equipped with a floating electrical connector passive end (4). The liquid circuit assembly is arranged on the front and top surfaces. M liquid circuit pipe joints (5) are set on the front surface to connect with the fluid circuit pipeline of the spacecraft. M liquid circuit floating disconnect passive terminals (3) are set on the top surface. Each liquid circuit pipe joint (5) corresponds to a liquid circuit floating disconnect passive terminal (3). N is an integer not less than 1 and M is an integer not less than 3. The expansion chassis consists of a top, front, rear, left, and right side panel. The guide device is arranged at the front, with positioning pins (15) distributed on the left and right. When docking, the left and right sides of the expansion chassis are used for rough positioning first, and then the positioning pins (15) at the front of the expansion chassis are inserted into the positioning pin holes (8) on the expansion adapter to achieve fine positioning. The mechanical locking device is arranged around the top surface, including N locking hooks (13) that cooperate with N hook pins (9) on the expansion adapter for locking; it also includes N locking pins (11) that cooperate with N hook seats (2) on the expansion adapter for unlocking and locking; The circuit connection device is arranged on the top surface, including one floating electrical connector; The liquid circuit connection device is arranged at the front, with a total of M active ends of the liquid circuit floating disconnectors. Each active end of the floating disconnector is equipped with a rocker slider mechanism with an assist wrench (16). When the assist wrench (16) is turned, the active end of the liquid circuit floating disconnector moves in a straight line until it is connected to the passive end (3) of the liquid circuit floating disconnector and locked, thus realizing the connection of the liquid circuit.

2. The fluid line extension standard of claim 1, wherein, The floating electrical connector is provided with an electrical connector handwheel (14), a handwheel seat (17), a lead screw (18), a nut (19), an electrical connector bracket (20), and a floating electrical connector active end (21). The electrical connector handwheel (14) and handwheel seat (17) are locked by a keyway and spring. When locked, pull the electrical connector handwheel (14) upward to disengage the key from the slot. Rotate the electrical connector handwheel (14) to drive the lead screw (18) to rotate and drive the nut (19) to move linearly. The nut (19) drives the electrical connector bracket (20) to move downward, and at the same time drives the active end (21) of the floating electrical connector to move and connect with the passive end (4) of the floating electrical connector in the expansion adapter to realize the connection of the circuit.

3. The fluid line extension standard of claim 1, wherein, The bottom of the fluid circuit equipment installed inside the expansion chassis is fixed to the side panel of the chassis with screws. After the expansion chassis and the expansion adapter are installed together, they form a complete cubic structure.

4. The fluid line extension standard of claim 1, wherein, The top surface of the expansion enclosure is equipped with a handle (12) for astronauts to grip during operation.

5. The fluid line extension standard of claim 1, wherein, The positioning pin hole (8) of the expansion adapter is a tapered hole guide design, one of which is elliptical and used for fine-tuning the position of the expansion adapter after it is connected to the expansion chassis.

6. The fluid line extension standard of claim 1, wherein, The expansion chassis features rounded-edge cutouts on the left and right sides to protect the expansion adapter during connection.

7. A standard device for expanding liquid circuits for easy extravehicular operation by astronauts according to claim 2, characterized in that, The rotational torque of the handwheel (14) of the electrical connector is not greater than 1.4 N·m, and the operating torque of the power wrench (16) is not greater than 70 N·m.

8. A standard device for expanding liquid circuits for easy extravehicular operation by astronauts according to claim 1, characterized in that, Heating pads are attached to the inner surface of the extended chassis for heat preservation.

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