A space hatch system and its rapid leak rate detection method

Abstract

This invention discloses a space hatch system and its rapid leak rate detection method, belonging to the field of space hatch reliability and safety design technology. The hatch system includes a sealed hatch, a pressure point switch, and a rapid leak detector. An inner and outer sealing ring are fitted onto the end face of the sealed hatch body. When the hatch is closed, the two sealing rings contact and press against the sealing surface of the hatch frame, forming a sealed cavity between the two sealing rings and the sealing surface of the hatch frame. The pressure point switch is located on the hatch frame and detects whether the hatch opening and closing action is complete. The rapid leak detector inflates the sealed cavity and performs a leak rate test to obtain the sealing condition of the sealing rings. Through the application of this invention, the completion of hatch action can be reliably detected, and the hatch's sealing performance can be quickly determined, providing a quantitative basis for whether the hatch can be reliably closed.

Description

Technical Field

[0001] This invention relates to a space hatch system and a rapid leak rate detection method thereof, belonging to the field of space hatch reliability and safety design technology. Background Technology

[0002] As a moving component, the hatch is sealed with non-metallic sealing materials, making its airtightness a crucial aspect of the overall sealing performance of the space station. Therefore, a specialized testing device for the sealing performance of manned spacecraft hatches has emerged: the hatch rapid leak detector. After the hatch closes, a small space is formed between the two sealing rings on the hatch body and the hatch frame. The leak detector innovatively utilizes the unique structure of the hatch, filling a certain amount of detection gas into this small space during operation and judging the hatch's sealing condition by monitoring changes in pressure within the small space. Currently, based on publicly available information, no hatch rapid leak detector products have been found on foreign space stations or spacecraft. Only the Russian TM spacecraft developed a "dock joint sealing monitoring device" to monitor leaks at the docking points of two spacecraft, using pressure sensors to measure the sealing condition at the docking points; its principle should be roughly the same as the hatch rapid leak detector.

[0003] To prevent leaks from the hatches in the space, it is necessary to check for leaks in the two sealing rings after the hatches are closed. Existing leak detection devices require filling the entire compartment with sufficient gas, which is time-consuming, complex to operate, and has low reliability in terms of leak detection results. Summary of the Invention

[0004] The technical problem solved by this invention is to overcome the shortcomings of the prior art and propose a space hatch system and its rapid leak rate detection method. Through the design of a pressure point switch and a portable hatch rapid leak detector, the system can reliably detect whether the hatch is closed properly and its sealing performance.

[0005] The technical solution of this invention is:

[0006] A space hatch system includes a sealed hatch, a pressure point switch, and a rapid leak detector for the hatch;

[0007] The sealed hatch includes a hatch body assembly, a hatch frame, and a hatch hinge assembly. The hatch frame end face is provided with a sealing surface and a leak detection pipeline with one end located on the sealing surface. The hatch body assembly includes an inner sealing ring, an outer sealing ring, a linkage mechanism, and a hatch body. The inner and outer sealing rings are fitted onto the hatch body end face from the inside out. When the hatch is closed, the two sealing rings contact and press against the sealing surface of the hatch frame, forming a sealed cavity between the two sealing rings and the sealing surface of the hatch frame. The hatch hinge assembly is connected to the hatch body.

[0008] A pressure point switch, installed on the door frame, detects whether the hatch opening and closing action is complete;

[0009] The rapid leak detector for the hatch is connected to the other end of the leak detection line. After the sealed hatch is closed, air is injected into the sealed cavity through the leak detection line to perform a leak rate test, obtain the sealing condition of the sealing ring, and confirm whether the sealed hatch can be closed reliably.

[0010] Furthermore, the pressure point switch includes a lever gear, a shaft, a torsion spring, a contact rod, a base, a roller, a gear shaft, and a micro switch;

[0011] The roller is connected to the lever end of the lever gear, which rotates around the shaft; the gear end of the lever gear meshes with the gear on the gear shaft, and a torsion spring is installed on the gear shaft, with a contact rod connected to the torsion spring.

[0012] The micro switch is mounted on the base, which is mounted on the door frame assembly; one end of the contact rod contacts the micro switch, and the torque of the torsion spring is greater than the force generated by the micro switch contact on the contact rod.

[0013] Furthermore, when the hatch is open, the lever end of the lever gear of the hatch pressure switch is not pressed by the hatch body assembly, and the contact rod remains in its initial position under the action of the torsion spring. The micro switch sends an electrical signal indicating that the hatch is open. When the hatch is closed, the hatch body assembly contacts and presses against the roller of the pressure switch. The lever gear rotates around its axis, transmitting displacement and torque to the gear shaft through the gear end. The gear shaft is pressed against the contact rod through the torsion spring. The rotation of the gear shaft drives the rotation of the contact rod, which compresses the contact of the micro switch. The micro switch then sends an electrical signal indicating that the hatch is closed.

[0014] Furthermore, the hatch rapid leak detector includes a housing, a gas cylinder, a solenoid valve, a pressure sensor, an electronic control unit, an inflation assembly, and external components;

[0015] The gas cylinder, solenoid valve, pressure sensor, electronic control unit, and inflation assembly are located inside the housing. The external assembly is the interface between the housing and the outside. The external assembly is connected to the leak detection pipeline on the door frame. The outlet of the gas cylinder is connected to the external assembly through the internal pipeline. The solenoid valve is located on the internal pipeline and operates in a pulse mode under the control of the electronic control unit.

[0016] The pressure sensor is used to detect the pressure in the leak detection chamber after inflation reaches the threshold pressure;

[0017] The inflation assembly connects to the gas cylinder inlet, compresses the atmosphere inside the chamber, and fills the gas cylinder.

[0018] Furthermore, the external component includes a quick-break interface and a leak detection hose; the gas cylinder outlet is connected to the leak detection hose and the quick-break interface in sequence through an internal pipeline, and the other end of the quick-break interface is connected to the leak detection pipeline located on the door frame.

[0019] Furthermore, the rapid leak detector for the hatch also includes a one-way valve installed on the pipeline between the inflation assembly and the gas storage cylinder to prevent gas backflow.

[0020] Furthermore, the door hinge assembly includes a door hinge, a torsion spring, and a floating snap ring; the door hinge is connected to the door body through the torsion spring, and the floating snap ring holds the door hinge in place. When the hatch is closed, the door hinge compresses the floating snap ring to retract, causing the door body to move horizontally, and the two sealing rings contact and press against the sealing surface of the door frame assembly.

[0021] Furthermore, when closing the hatch, the door body first rotates and then translates, specifically as follows:

[0022] When a closing command is issued, the external force compresses the torsion spring, and the door rotates along the door hinge until it is in a pre-compressed state;

[0023] In the pre-tightened state, the linkage mechanism rotates, and a cam is provided at the end of the linkage mechanism. The cam slides into the slide rail, and the door body generates a downward clamping force. The door shaft compresses the floating snap spring to retract, and the door body moves horizontally, uniformly compressing the double sealing ring to press the sealing surface of the door frame assembly.

[0024] Furthermore, multiple pressure point switches are placed on the door frame assembly to improve the accuracy of detecting when the door movement is in place.

[0025] Methods for rapid leak rate detection of space hatch systems include:

[0026] Step 1: First, perform pulse inflation on the sealed cavity formed by the two sealing rings and the door frame sealing surface. Determine whether the cavity pressure can be increased to the pre-inflation pressure within the specified number of times to quickly determine the maximum leakage rate. If the seal is found to be abnormal, the test ends and the conclusion of incomplete closure is given; if the seal is found to be good, proceed to Step 2.

[0027] Step 2: Maintain pressure in the sealed cavity. By comparing the pressure drop of the sealed cavity collected within a set time period, a relatively quick judgment of severe leakage rate exceeding the standard can be made. If it is judged to be an abnormal seal, the test ends and a conclusion of incomplete closure is given. If it is judged to be a good seal, proceed to Step 3.

[0028] Step 3: After the severe leakage rate exceeds the standard, the leakage rate calculation and judgment begin; the rapid leak detector continues to collect the pressure of the sealed chamber within the specified time period to calculate the real-time leakage rate; the real-time leakage rate is compared with the over-limit leakage rate index. If five consecutive real-time leakage rates exceed the over-limit leakage rate, the leakage rate is considered to be excessive, the test ends and a conclusion of incomplete closure is given; if the leakage rate does not exceed the standard, the test ends and a conclusion of complete closure is given.

[0029] The advantages of this invention compared to the prior art are:

[0030] (1) The present invention constructs a hatch system that can detect the hatch closing position and sealing performance. It consists of a sealed hatch, pressure point switches and a portable hatch rapid leak detector. The advantage of this system is that the three pressure point switches can reliably detect the hatch operation position by "selecting two out of three". Then the rapid leak detector can quickly give the sealing performance of the hatch through the leak rate test, providing a quantitative basis for whether the hatch is reliably closed.

[0031] (2) Through the design of the hatch mechanism, the present invention realizes the action sequence of "rotation first and translation later" during the hatch closing process: First, the astronaut rotates the hatch to the locking preparation position by using the hatch handle, rotates the switch to rotate the handle to drive the linkage mechanism to move, and the cam mechanism at the end of the linkage causes the hatch body to translate. The translation of the hatch uniformly compresses the double end face sealing ring to ensure the sealing performance. At the same time, the translation of the hatch triggers three hatch pressure point switches to give signals.

[0032] (3) The present invention adopts a pressure point switch design scheme of "two-stage lever + torsion spring force limiting". This scheme has an overtravel protection function, that is, it has the function of being able to adapt to different compression of the hatch body and still stably give the position signal. This function can ensure that the hatch can stably give the position signal under different pressure differences.

[0033] (4) The rapid leak detector designed in this invention is a portable plug-and-play device with its own gas cylinder and power supply, and has its own display function. It does not require external power supply or gas supply. It can be connected to the object being tested through a quick disconnect and can realize the "one-to-many" detection function.

[0034] (5) The rapid leak detector designed in this invention uses the space formed by the double sealing rings on the end face of the hatch to detect the leak rate. The detection time is controlled in minutes, and the detection time is short and the efficiency is high. At the same time, the product is designed with a soft portable bag with a handle, which can be hung inside the space station or fixed by hook and loop, making it convenient to use and meeting the requirements of ergonomic design.

[0035] (6) The portable rapid leak detector designed in this invention can be inflated in the chamber by an air pump and the battery can be replaced, so the product has the feature of being reusable. Attached Figure Description

[0036] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0037] Figure 1 This is a schematic diagram of the space hatch system according to an embodiment of the present invention;

[0038] Figure 2This is a schematic cross-sectional view (A) of the hatch system in the open state according to an embodiment of the present invention;

[0039] Figure 3 This is a schematic cross-sectional view (B) of the pre-compression state of the door system according to an embodiment of the present invention;

[0040] Figure 4 This is a schematic diagram of the installation position of the pressure point switch according to an embodiment of the present invention;

[0041] Figure 5 This is a schematic diagram illustrating the working principle of the pressure point switch according to an embodiment of the present invention;

[0042] Figure 6 This is a schematic diagram of the external appearance of the portable leak detector according to an embodiment of the present invention;

[0043] Figure 7 This is a schematic diagram illustrating the connection between the portable leak detector and the hatch in an embodiment of the present invention.

[0044] Figure 8 This is a schematic diagram of the fast-break principle in an embodiment of the present invention. Detailed Implementation

[0045] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0046] This invention proposes a space hatch system, such as Figure 1 As shown, it includes a sealed hatch 10, a pressure point switch 20, and a portable hatch rapid leak detector 30.

[0047] The sealed hatch 10 includes a hatch body 16, a door hinge 131, an inner sealing ring 11, an outer sealing ring 12, a torsion spring 133, a floating snap ring 132, a hatch handle 14, a hatch frame 15, a handle 181, a linkage mechanism 182, a cam 183, and a slide rail 19.

[0048] The hatch body 16 is connected to the door hinge 131 via a torsion spring 133, allowing the hatch to rotate along the door hinge. Figure 2 As shown. The hatch hinge is held in place by a floating snap ring 132. When the hatch is closed, applying pressure can compress the floating snap ring 132, causing the hatch to move horizontally.

[0049] The inner ring 11 and outer ring 12 of the sealing ring are installed on the hatch body 16, such as Figure 3As shown, the hatch repeatedly contacts and presses against the sealing surface of the hatch frame 15 as the hatch opens and closes, achieving a seal inside the cabin when the hatch is closed. This design simplifies the sealing process and, through the redundant design of the double sealing rings, achieves a long seal during the repeated switching of the sealing state during the hatch closing and opening process, thus improving the reliability and stability of the seal.

[0050] When it is necessary to close the hatch, the astronauts pull handle 14 on the hatch, causing the hatch to open. Figure 3 Turn to open position Figure 2 Pre-tightening state. Rotating the handle 181 on the hatch causes the linkage mechanism 182 to rotate, pushing the cam 183 at the end of the linkage mechanism into the slide rail 19. This generates a downward clamping force on the entire hatch, causing the hatch hinge 131 to compress the floating snap ring 132, thus tightening the hatch. This design solves the problem of the hatch only being able to rotate and not translate, thus preventing uniform clamping. It ensures the stability and airtightness of the chamber under test, thereby improving the accuracy of the test. The application of the hatch hinge enables a combined motion during opening and closing, as well as during the clamping process, achieving uniform sealing of the double-layer sealing ring.

[0051] The pressure switch 20 is installed on the hatch frame 15, such as... Figure 4 , Figure 5 As shown, the device includes a lever gear 21, a shaft 22, a torsion spring 23, a contact rod 24, a base 25, a roller 26, a gear shaft 27, a micro switch 28, and a housing 29. The roller 26 is connected to the rod end of the lever gear 21, which rotates around the shaft 22. The gear end of the lever gear 21 meshes with a gear on the gear shaft 27. A torsion spring 23 is mounted on the shaft of the gear shaft 27, and a contact rod 24 is connected to the torsion spring. The micro switch 28 is mounted on the base 25, and one end of the contact rod 24 contacts the micro switch 28. When the hatch is open, the lever end of the lever gear 21 of the hatch door pressure switch is not pressed by the hatch, and the contact rod 24 remains in its initial position under the action of the internal torsion spring 23. The micro switch 28 then sends an electrical signal indicating that the hatch is open. When the hatch closes, it contacts and presses against the roller 26 of the pressure switch. The lever gear 21 rotates around the shaft 22, transmitting displacement and torque to the gear shaft 27 through the gear end. The gear shaft 27 is pressed against the contact rod 24 by a torsion spring 23. The torque of the torsion spring 23 is slightly greater than the torque generated by the contact of the micro switch 28 on the contact rod 24, ensuring good contact. Thus, the rotation of the gear shaft 27 drives the rotation of the contact rod 24, which compresses the contact of the micro switch 28. When the hatch closes, an electrical signal indicating the closed state is emitted.

[0052] The portable leak detector 30 consists of a quick-break connector 32, a leak detection hose 33, an outer handle 34, a snap fastener 35, a housing 36, a display screen and indicator lights 37, a switch 38, and a battery compartment 39. Internally, the leak detector contains a one-way valve, a small gas cylinder, a solenoid valve, a pressure sensor, an electronic control unit, leak detection tubing, and an inflation assembly, such as... Figure 2 , Figure 6 As shown. In use, suspend the leak detector in any suitable position using the handle or fastener, and insert the quick-connect interface into the leak detection pipe 31 pre-installed on the door frame 15, as shown. Figure 2 , Figure 7 As shown, rapid leak detection of the leak detection chamber 17 can then begin. Simultaneously, the pressure point switch 20 provides timely feedback on the opening and closing status of the hatch. The working principle of the quick-break interface is as follows... Figure 8 As shown, the device is in a ventilated state when connected and a self-sealing device when disconnected. During inflation, a one-way valve is used to prevent gas backflow. The electronic control unit controls the solenoid valve to inflate the leak detection chamber 17 of the tested object in a pulse manner. After the inflation reaches the threshold pressure, leak detection begins. Since the internal pressure is higher than the external pressure of the leak detection chamber 17, the sealing condition of the sealing ring is detected by monitoring the pressure change of the leak detection chamber 17. If either of the two sealing rings leaks, a leak is determined when the leakage rate exceeds the given over-limit leakage rate. However, in reality, as long as one sealing ring is properly sealed, the sealing of the hatch / dating surface can be guaranteed. Therefore, the rapid leak detector has stricter requirements for the hatch / sealing surface.

[0053] In an atmospheric environment, astronauts use an inflation assembly to compress the cabin atmosphere, filling a small gas cylinder with "high-pressure" gas. After inflation is complete, the inflation assembly is detached from the leak detector. The inflated leak detector can then be used by the astronauts in atmospheric or vacuum environments. The leak detector and leak detection hose 33 are connected before ascent; the other end of the hose is a quick-break type. Connecting the quick-break end of the hose to the interface of the object being tested activates the leak detector. The leak detector is powered by a disposable battery, and its operating status and detection results are displayed on the panel via a screen and indicator lights.

[0054] This invention achieves uniform sealing of the double-layer sealing rings between flanges by designing the translational movement of the hatch, ensuring the stability and airtightness of the chamber under test, thereby improving the accuracy of the test. After the hatch is closed and the mating surfaces are locked, a small annular cavity is formed between the two flange surfaces and the two sealing rings for leak detection, shortening the testing time and improving the efficiency and effectiveness of the test. A hatch closure indicator switch is designed to promptly reflect the open and closed status of the hatch.

[0055] Methods for rapid leak rate detection of hatch systems include:

[0056] Step 1: First, perform pulse inflation on the sealed cavity. By judging whether the pressure in the small cavity can be increased to the pre-inflation pressure within the specified number of times, the maximum leakage rate can be judged as quickly as possible.

[0057] Step 2: After inflation is complete, maintain pressure in the sealed cavity and make a quick judgment on serious leakage rate exceeding the standard by performing a simple pressure comparison within a short period of time.

[0058] Step 3: After determining the severe leakage rate exceeds the standard, leakage rate calculation and judgment begin. The rapid leak detector for the hatch collects the pressure in the small cavity within a specified time period and calculates the real-time leakage rate based on the collection time. The real-time leakage rate is compared with the over-limit leakage rate index. If five consecutive real-time leakage rates exceed the over-limit leakage rate, the leakage rate is considered to be excessive.

[0059] Step 4: If the test passes the three judgment procedures of inflation judgment, serious over-limit judgment and leakage rate judgment in sequence, the leakage rate of the sealed cavity is considered to meet the requirements. Otherwise, if any stage is judged to be abnormal, an abnormal result will be given and the test process will end.

[0060] The embodiments described above are merely preferred embodiments of the present invention. Ordinary variations and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for rapid leak detection of a space hatch system, comprising: The space hatch system comprises a sealed hatch, a pressure point switch and a hatch rapid leak detector; the sealed hatch comprises a door body assembly, a door frame and a door shaft assembly; the door frame end face is provided with a sealing surface and a leak detection pipeline at one end located on the surface of the sealing surface; the door body assembly comprises an inner sealing ring, an outer sealing ring, a connecting rod mechanism and a door body; the inner sealing ring and the outer sealing ring are sleeved on the door body end face from inside to outside; when the hatch is closed, the two sealing rings are in contact with the sealing surface of the door frame and are pressed tightly, and a sealed cavity is formed between the two sealing rings and the sealing surface of the door frame; the door shaft assembly is connected with the door body; the pressure point switch is arranged on the door frame and detects whether the hatch opening and closing action is in place; the other end of the leak detection pipeline is connected with the hatch rapid leak detector; after the sealed hatch is closed, the hatch rapid leak detector inflates the sealed cavity through the leak detection pipeline and performs a leak rate test to obtain the sealing condition of the sealing ring and confirm whether the sealed hatch is reliably closed; Step one: first, the sealed cavity formed by the two sealing rings and the sealing surface of the door frame is pulsed inflated; whether the cavity pressure can be charged to the pre-charging pressure within a specified number of times is judged to make the fastest large leak rate judgment; if the sealing is abnormal, the detection is ended and a conclusion that the closing is not in place is given; if the sealing is good, step two is performed; Step two: the sealed cavity is pressure maintained; the pressure drop of the sealed cavity pressure collected in a set time period is compared to complete the rapid serious leak rate over-limit judgment; if the sealing is abnormal, the detection is ended and a conclusion that the closing is not in place is given; if the sealing is good, step three is performed; Step three: after the serious leak rate over-limit judgment, the leak rate calculation and judgment are started; the hatch rapid leak detector continues to collect the sealed hatch pressure in a specified time period to calculate the real-time leak rate; the real-time leak rate is compared with the over-limit leak rate index; if the five consecutive real-time leak rates exceed the over-limit leak rate, it is considered that the leak rate is over-limit, the detection is ended and a conclusion that the closing is not in place is given; if the leak rate is not over-limit, the detection is ended and a conclusion that the closing is in place is given. The pressure point switch comprises a lever gear, a shaft, a torsional spring, a contact rod, a base, a roller, a gear shaft and a micro switch; 2. The method of claim 1, wherein, The roller is connected to the lever end of the lever gear, and the lever gear rotates around the shaft; the gear end of the lever gear is engaged with the gear on the gear shaft; the shaft of the gear shaft is provided with the torsional spring, and the contact rod is connected to the torsional spring; The micro switch is installed on the base, and the base is installed on the door frame assembly of the hatch; one end of the contact rod is in contact with the micro switch, and the torque of the torsional spring is greater than the force of the contact of the micro switch on the contact rod. When the hatch is in the open state, the lever end of the lever gear of the hatch pressure point switch is not pressed tightly by the door body assembly of the hatch, the contact rod keeps the initial position under the action of the torsional spring, and the micro switch sends an electric signal that the hatch is in the open state; when the hatch is closed, the door body assembly of the hatch is in contact with and pressed tightly by the roller of the pressure point switch, the lever gear rotates around the shaft, the displacement and torque are transmitted to the gear shaft through the gear end, the gear shaft is pressed tightly with the contact rod through the torsional spring, the rotation of the gear shaft drives the rotation of the contact rod, the contact rod compresses the contact of the micro switch, and the micro switch sends an electric signal that the hatch is in the closed state.

3. The method of claim 2, wherein the space hatch system is configured to perform a quick leak detection. The hatch rapid leak detector comprises a shell, a gas storage cylinder, an electromagnetic valve, a pressure sensor, an electric control unit, an inflation assembly and an external assembly.

4. The method of claim 1, wherein the space hatch system is configured to perform a quick leak detection. ​ The gas cylinder, solenoid valve, pressure sensor, electric control unit and inflating assembly are located inside the shell, the external connecting assembly is an external interface of the shell, the external connecting assembly is connected with the leak detection pipeline on the door frame, and the outlet of the gas cylinder is connected with the external connecting assembly through the internal pipeline; The solenoid valve is arranged on the internal pipeline and works in a pulse mode under the control of the electric control unit; The pressure sensor is used for detecting the pressure of the leak detection cavity after the inflation reaches a threshold pressure; The inflating assembly is connected with the inlet of the gas cylinder and inflates the cabin atmosphere into the gas cylinder after compression.

5. The method of claim 4, wherein the space hatch system is configured to perform a quick leak detection. The external connecting assembly comprises a quick break interface and a leak detection hose, the outlet of the gas cylinder is sequentially connected with the leak detection hose and the quick break interface through the internal pipeline, and the other end of the quick break interface is connected with the leak detection pipeline on the door frame.

6. The method of claim 4, wherein the space hatch system is configured to perform a quick leak detection. The cabin door quick leak detection instrument further comprises a one-way valve which is arranged on the pipeline between the inflating assembly and the gas cylinder and prevents gas backflow.

7. The method of claim 1, wherein the space hatch system is configured to perform a quick leak detection. The door shaft assembly comprises a door shaft, a torsion spring and a floating snap spring, the door shaft is connected with the door body through the torsion spring, the floating snap spring abuts against the door shaft, when the cabin door is closed, the door shaft compresses the floating snap spring to shrink, so that the door body moves horizontally, and two sealing rings are in contact with the sealing surface of the door frame assembly.

8. The method of claim 7, wherein the space hatch system is configured to perform a quick leak detection. When the cabin door is closed, the door body rotates first and then moves horizontally, and the specific method is as follows: A closing instruction is sent, an external force compresses the torsion spring, the door body rotates along the door shaft until the door body is in a pre-compressed state; In the pre-compressed state, the connecting rod mechanism rotates, the end of the connecting rod mechanism is provided with a cam, the cam slides into a slide way, the door body generates a downward compression force, the door shaft compresses the floating snap spring to shrink, the door body moves horizontally, and the two sealing rings are uniformly compressed to compress the sealing surface of the door frame assembly.

9. The method of claim 1, wherein the space hatch system is configured to perform a rapid leak detection. A plurality of pressure point switches are arranged on the door frame assembly, so that the accuracy of detecting whether the cabin door moves to a position is improved.

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