A vacuum pumping method for a lunar soil and water ice simulation device under water and dust conditions

Abstract

A vacuum pumping method for a lunar soil and water ice simulation device under conditions with water and dust relates to the field of vacuum technology. In order to solve the technical problem in the prior art that there is no vacuum pumping method for conditions with dust and water, which makes it impossible to smoothly conduct simulation experiments in an ice-soil material research cabin, the present invention provides a vacuum pumping operating procedure for an experimental cabin under dust and water pollution conditions when conducting simulation research. During the entire vacuum pumping process, an active water removal and dust removal unit is added to the front stage of the pumping system. The rough pumping system prevents dust from experimental samples by repeatedly controlling the pumping speed. When the vacuum pump group switches to the pumping stage, a pressure maintenance method is used. Before opening the cabin door at the end of the experiment, the experimental cabin needs to be re-pressurized, and the re-pressurization system also needs to control the re-pressurization rate to prevent dust from static dust samples. It can be applied to the vacuum pumping operation of an experimental cabin under dust and water pollution conditions when simulating research in a low-temperature vacuum environment.

Description

Technical Field

[0001] The invention relates to the field of vacuum technology. Background Art

[0002] The vacuum system is a critical subsystem of the ice-soil research chamber, and dust and water conditions are essential for conducting experiments. However, existing technologies lack vacuum extraction methods that can handle dust and water conditions, hindering successful simulation experiments in ice-soil research chambers. Summary of the Invention

[0003] In order to solve the technical problem in the prior art that there is no vacuum extraction method for dust and water conditions, which makes it impossible to smoothly carry out simulation experiments in ice-soil material research chambers, the present invention provides the following technical solutions:

[0004] A vacuum pumping method for a lunar soil and water ice simulation device under water and dust conditions is applied to a lunar simulation chamber vacuum system, the vacuum system comprising:

[0005] Valves F1, F2, F3, and F4-2 connected in series for connecting the ice-soil material research chamber and the roughing system, and also including a valve F4-1 connected in parallel with the valve F4-2;

[0006] The method comprises:

[0007] The step of precooling the simulation chamber vacuum system;

[0008] Steps for opening valves F1, F2, F3, F4-2, and F4-1 to balance the pressure across the valves;

[0009] The steps of closing F4-2 and starting the roughing machine front-stage dry pump;

[0010] After the speed of the roughing machine front-stage dry pump is stabilized, the opening of F3 is adjusted to a preset value, and the valve F5 corresponding to the roughing machine front-stage dry pump is opened;

[0011] When the pressure resistance of the simulation chamber vacuum system reaches a preset pressure value, close F1 and F5 and maintain the pressure, stop the roughing machine front-stage dry pump at the same time, and close F4-1 and F2;

[0012] After the pressure maintenance is completed, F1, F2, F3 and F4-2 are opened. After the pressure on both sides of the roughing pipeline and the start gate valve is balanced, F4-2 is closed, F4-1 is opened, and the roughing machine front-stage dry pump is started;

[0013] When the speed of the roughing machine front-stage dry pump reaches a preset speed value, turning on F3 and F5;

[0014] When the vacuum degree of the simulation chamber vacuum system reaches the preset vacuum value, close F1 and F5, and maintain the pressure, stop the roughing machine front-stage dry pump, and close F2 and F4-1;

[0015] Steps to start the cryopump and shut down F1, F2, and F4-1.

[0016] Furthermore, a preferred embodiment is provided, wherein the pre-cooling specifically comprises: turning on the cold trap dewatering unit at the front end of the vacuum pump group and pre-cooling it.

[0017] Furthermore, a preferred embodiment is provided, wherein the method further includes the step of starting the electrostatic precipitator unit at the front end of the vacuum pump group.

[0018] Furthermore, a preferred embodiment is provided, in the step of opening valves F1, F2, F3, F4-2 and F4-1, the valve opening is 100%.

[0019] Furthermore, a preferred embodiment is provided, in which the judgment condition for the stable rotation speed of the roughing machine front-stage dry pump is that the rotation speed reaches a stable 120 Hz.

[0020] Furthermore, a preferred embodiment is provided, wherein the preset pressure value is less than 50,000 Pa.

[0021] Furthermore, a preferred embodiment is provided, in which when the rotation speed of the roughing machine front-stage dry pump reaches a preset rotation speed value, the opening degree of F3 is opened to 5%.

[0022] Furthermore, a preferred embodiment is provided, wherein the preset vacuum value is less than 5Pa.

[0023] Furthermore, a preferred embodiment is provided, wherein the method further includes: when the vacuum degree of the simulation chamber vacuum system reaches a preset vacuum value, during the pressure maintaining process, if the vacuum degree is above 10Pa, the step of starting the roughing machine front-stage dry pump.

[0024] Based on the same inventive concept, the present invention also provides a lunar simulation chamber vacuum system for implementing the method described above, including:

[0025] Lunar PSR comprehensive environment simulation cabin;

[0026] An electrostatic dust removal unit and a cold trap water removal unit at the front end of the vacuum pump group are sequentially connected in series with the simulation cabin;

[0027] Valves F1, F2, F3, F4-2, F5, Roots pump and dry pump are sequentially connected in series with the cold trap dewatering unit at the front end of the vacuum pump group;

[0028] Also included is valve F4-1 connected in parallel with F4-2;

[0029] A low temperature pump and a dry pump are sequentially connected in series with the cold trap dewatering unit at the front end of the vacuum pump group.

[0030] The present invention provides a vacuum pumping method for a lunar soil and water ice simulation device under water and dust conditions. During the entire vacuum pumping process, an active water and dust removal unit is added to the front stage of the pumping system, which can effectively remove water and dust from the experimental samples and ensure the accuracy and reliability of the experiment.

[0031] The present invention provides a vacuum pumping method for a lunar soil and water ice simulation device under water and dust conditions. During the pumping process, the pumping speed is controlled to prevent dust from being raised from the experimental samples, avoid polluting the experimental environment, and ensure the accuracy of the experimental results.

[0032] The present invention provides a vacuum pumping method for a lunar soil and water ice simulation device under water and dust conditions. When the vacuum pump group switches the pumping stage, a pressure maintenance method is used to avoid pressure fluctuations caused by sudden pumping switching, thereby protecting the safety of experimental samples and equipment.

[0033] The present invention provides a vacuum pumping method for a lunar soil and water ice simulation device under water and dust conditions, which controls the re-pressurization rate to prevent static dust samples from raising dust: the experimental cabin needs to be re-pressurized before the cabin door is opened at the end of the experiment. The re-pressurization system prevents static dust samples from raising dust by controlling the re-pressurization rate to ensure the cleanliness of the experimental environment.

[0034] Compared to other existing research, the vacuum pumping method for a lunar soil and water ice simulation device under water and dust conditions proposed in this paper addresses vacuum regulations for these conditions by employing active water and dust removal units, controlled pumping speed, pressure-maintaining transition pumping, and controlled repressurization rates. This effectively addresses dust and contamination issues with experimental samples and improves experimental accuracy and reliability. Compared to traditional vacuum protocols, this solution is more detailed and comprehensive, better suited to the needs of experiments under water and dust conditions.

[0035] The present invention provides a vacuum pumping method for a lunar soil and water ice simulation device under water and dust conditions, which can be used to simulate the vacuum pumping operation of an experimental cabin under dust and water pollution conditions when studying the formation of ice-soil materials in a low-temperature vacuum environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a flow chart of a vacuum pumping method for a lunar soil and water ice simulation device under water and dust conditions;

[0037] Figure 2 This is a system diagram of the lunar simulation chamber vacuum system. DETAILED DESCRIPTION

[0038] In order to make the advantages and benefits of the technical solution provided by the present invention more clearly reflected, the technical solution provided by the present invention is now further described in detail with reference to the accompanying drawings, specifically:

[0039] Embodiment 1: This embodiment provides a vacuum pumping method for a lunar soil and water ice simulation device under water and dust conditions, which is applied to a lunar simulation chamber vacuum system. The vacuum system includes:

[0040] Valves F1, F2, F3, and F4-2 connected in series for connecting the ice-soil material research chamber and the roughing system, and also including a valve F4-1 connected in parallel with the valve F4-2;

[0041] The method comprises:

[0042] Pre-cooling the simulation chamber vacuum system;

[0043] Steps for opening valves F1, F2, F3, F4-2, and F4-1 to balance the pressure across the valves;

[0044] The steps of closing F4-2 and starting the roughing machine front-stage dry pump;

[0045] After the speed of the roughing machine front-stage dry pump is stabilized, the opening of F3 is adjusted to a preset value, and the valve F5 corresponding to the roughing machine front-stage dry pump is opened;

[0046] When the pressure resistance of the simulation chamber vacuum system reaches a preset pressure value, close F1 and F5 and maintain the pressure, stop the roughing machine front-stage dry pump at the same time, and close F4-1 and F2;

[0047] After the pressure maintenance is completed, F1, F2, F3 and F4-2 are opened. After the pressure on both sides of the roughing pipeline and the start gate valve is balanced, F4-2 is closed, F4-1 is opened, and the roughing machine front-stage dry pump is started;

[0048] When the speed of the roughing machine front-stage dry pump reaches a preset speed value, turning on F3 and F5;

[0049] When the vacuum degree of the simulation chamber vacuum system reaches the preset vacuum value, close F1 and F5, and maintain the pressure, stop the roughing machine front-stage dry pump, and close F2 and F4-1;

[0050] Steps to start the cryopump and shut down F1, F2, and F4-1.

[0051] Implementation method 2. This implementation method further limits the vacuum pumping method of a lunar soil and water ice simulation device under water and dust conditions provided in implementation method 1. The pre-cooling is specifically: turning on the cold trap dewatering unit at the front end of the vacuum pump group and pre-cooling it.

[0052] Implementation method three: This implementation method further limits the vacuum pumping method of a lunar soil and water ice simulation device under water and dust conditions provided in implementation method one. The method also includes the step of starting the electrostatic dust removal unit at the front end of the vacuum pump group.

[0053] Implementation method 4. This implementation method further limits the vacuum pumping method of a lunar soil and water ice simulation device under water and dust conditions provided in implementation method 1. In the steps of opening valves F1, F2, F3, F4-2 and F4-1, the valve opening is 100%.

[0054] Implementation method five: This implementation method further limits the vacuum pumping method of the lunar soil and water ice simulation device under water and dust conditions provided in implementation method one. The judgment condition for the stable speed of the roughing machine front-stage dry pump is that the speed reaches a stable 120Hz.

[0055] Implementation method six: This implementation method further limits the vacuum pumping method of the lunar soil and water ice simulation device under water and dust conditions provided in implementation method one, and the preset pressure value is less than 50,000 Pa.

[0056] Implementation method seven. This implementation method further limits the vacuum pumping method of the lunar soil and water ice simulation device under water and dust conditions provided in implementation method one. When the speed of the front-stage dry pump of the roughing machine reaches the preset speed value, the opening degree of F3 is opened to 5%.

[0057] Implementation method eight: This implementation method further limits the vacuum pumping method of a lunar soil and water ice simulation device under water and dust conditions provided in implementation method one, and the preset vacuum value is less than 5Pa.

[0058] Implementation method nine. This implementation method further limits the vacuum pumping method of a lunar soil and water ice simulation device under water and dust conditions provided in implementation method one. The method also includes: when the vacuum degree of the simulation chamber vacuum system reaches a preset vacuum value, during the pressure maintaining process, if the vacuum degree is above 10Pa, the step of starting the roughing machine front-stage dry pump.

[0059] Embodiment 10: This embodiment provides a lunar simulation chamber vacuum system for implementing the method provided in embodiment 1, including:

[0060] Lunar PSR comprehensive environment simulation cabin;

[0061] An electrostatic dust removal unit and a cold trap water removal unit at the front end of the vacuum pump group are sequentially connected in series with the simulation cabin;

[0062] Valves F1, F2, F3, F4-2, F5, Roots pump and dry pump are sequentially connected in series with the cold trap dewatering unit at the front end of the vacuum pump group;

[0063] Also included is valve F4-1 connected in parallel with F4-2;

[0064] A low temperature pump and a dry pump are sequentially connected in series with the cold trap dewatering unit at the front end of the vacuum pump group.

[0065] Implementation Method 11: Combination Figure 1 and 2 This embodiment further illustrates the above technical solution in detail and completely through specific examples, specifically:

[0066] This embodiment provides a vacuum pumping operating procedure for an experimental chamber under dust and water pollution conditions for simulating the formation of ice-soil materials in a low-temperature vacuum environment. The vacuum system is an important subsystem of the ice-soil material research chamber, and dust and water conditions are necessary conditions for conducting experiments. During the entire vacuum pumping process, an active water removal and dust removal unit is added to the front stage of the pumping system. The rough pumping system prevents dust from the experimental samples by repeatedly controlling the pumping speed. When the vacuum pump group switches to the pumping stage, the pressure maintenance method is used. The experimental chamber needs to be re-pressurized before opening the cabin door at the end of the experiment, and the re-pressurization system also needs to control the re-pressurization rate to prevent dust from static dust samples.

[0067] like Figure 1 As shown, the method flow is:

[0068] 1. Technical indicators of dust and water vacuum system

[0069] (1) When the container is empty, the loaded limit pressure is ≤5×10 -5 Pa;

[0070] (2) When studying the formation of ice-soil materials under deep low temperature vacuum environment, the load limit pressure is ≤5×10 - 3 Pa.

[0071] 2. Composition of the vacuum system of the ice-soil material evolution environment simulation chamber

[0072] The simulation cabin vacuum system is an oil-free system, which adopts a Roots dry pump unit as a roughing system and a cryogenic pump as the main high vacuum system. It consists of a cryogenic pump, a Roots pump / dry pump roughing unit, a dry pump and corresponding vacuum valves, vacuum pipes, vacuum measurement systems, etc., as well as an electrostatic dust removal unit and a cold trap water removal unit.

[0073] See the schematic diagram of the vacuum system Figure 2 .

[0074] 3. Vacuum pumping procedures

[0075] 3.1 Pretreatment of experimental samples

[0076] Experimental samples are prone to gas absorption. For this type of experiment, they must be baked to fully degas before being placed in the ice-soil research chamber. When placing the experimental samples inside the chamber, they must be evenly spaced to avoid close packing and compaction to prevent large amounts of gas from accumulating between the samples.

[0077] 3.2 Vacuum pumping operation process

[0078] During the entire pumping process, the roughing system controls the pumping speed (i.e., reduces the rate) to prevent static dust samples from raising dust. When the pump unit switches to the pumping stage, the pressure maintenance mode is used for transition.

[0079] The specific operation process is as follows:

[0080] Step 1: Read the instruction manuals of each vacuum pump and related equipment in detail to understand the structure and working principle of the equipment, confirm that the ambient temperature and humidity conditions can enable the vacuum pump to start normally, and read this procedure.

[0081] Step 2: Confirm that the water, electricity and gas systems are in normal condition, the container door is closed, and all valves are closed.

[0082] Step 3: Start the cold trap dewatering unit at the front end of the vacuum pump group and pre-cool it until it can work normally.

[0083] Step 4: Start the electrostatic dust removal unit at the front end of the vacuum pump group.

[0084] Step 5: Open the valves between the ice-soil material research chamber and the crude pumping system (F1, F2, F3, F4-2, set to 100%), balance the pressure on both sides of the container and the crude pumping pipeline to be equal, and then close valve F4-2.

[0085] Step 6: Confirm the pressure status of the container and pipeline again and open F4-1.

[0086] Step 7: Start the roughing unit's front-stage dry pump and make its speed reach a stable 120Hz.

[0087] Step 8: Adjust the opening of the F3 valve.

[0088] Step 9: Open valve F5 corresponding to the roughing unit's fore-stage dry pump.

[0089] Step 10: Observe the indication of the container pressure resistance gauge Y1, and control the opening of the pipeline regulating valve F3 according to the pressure change law and experimental requirements.

[0090] Step 11: When the container pressure resistance gauge Y1 indicates a value ≤ 50,000 Pa, close F1 and dry pump the corresponding valve F5 to maintain the container pressure (the pressure holding time can be adjusted according to the state of the test piece). Stop the corresponding roughing unit front stage dry pump and close F4-1 and F2.

[0091] Step 12: After the pressure maintenance is completed, confirm the pressure status of container Y1 and roughing pipeline Y3. When it is determined that the status is normal and the experiment can be carried out, open the valves between the ice-soil material research cabin and the roughing system (F1~3, F4-2, the opening is set to 100%), balance the pressure on both sides of the container and the roughing pipeline and the pneumatic plug-in valve, wait for the pressure to be equal, close valve F4-2, open F4-1, start the roughing unit front-stage dry pump, and when the speed reaches 120Hz and stabilizes, set valve F3 (opening is set to 5%), open valve F5 corresponding to the roughing unit front-stage dry pump, and continue to evacuate the container.

[0092] Step 13: Observe the indication of the container pressure resistance gauge Y1, and control the opening of the pipeline regulating valve F3 according to the pressure change law and experimental requirements.

[0093] Step 14: When the container vacuum (Y1, Y2) is ≤5Pa, close valve F1 and the dry pump corresponding valve F5 to maintain the container pressure (the pressure holding time can be adjusted according to the state of the test piece). Stop the corresponding roughing unit front stage dry pump and close valves F2 and F4-1.

[0094] Step 15: After the pressure maintenance is completed, confirm the pressure status of the container (Y1, Y2). When the vacuum degree of the container (Y1, Y2) is greater than 10Pa, start the roughing unit dry pump to evacuate the container. The operation sequence is the same as described above.

[0095] Step 16: When the vacuum degree of the container (Y1, Y2) is ≤10Pa, start the cryogenic pump to evacuate the container and observe the pressure change.

[0096] Step 17: The cryogenic pump continues to pump gas, close F1, F2, F4-1, dry pump corresponding valve F5, and stop the corresponding roughing unit fore-stage dry pump.

[0097] Step 18: After the experiment is over, close the corresponding valve of the cryopump and stop the cryopump.

[0098] Step 19: Turn off the cold trap water removal unit and electrostatic dust removal unit at the front end of the vacuum pump group.

[0099] 4. Vacuum vessel re-pressurization procedures

[0100] The container needs to be re-pressurized before opening the door at the end of the experiment. When the experiment is carried out under dusty conditions, the re-pressurization system must prevent static dust samples from being raised by controlling the re-pressurization rate operation mode.

[0101] The specific operation process is as follows:

[0102] Step 1: Confirm that the heat sink temperature returns to room temperature or the temperature at each point in the container is not lower than the dew point temperature of the on-site environment.

[0103] Step 2: Based on the experimental requirements, re-pressurize the container with air to atmospheric pressure. Open valves F1, F2, F4-1, and F6, and set the re-pressurization rate (the opening of valve F3 is set to 1%, which can be adjusted according to the actual experimental conditions). After re-pressurizing the container to atmospheric pressure and opening the gate, close all vacuum valves.

[0104] The above further describes the technical solution provided by the present invention in detail through several specific embodiments in order to highlight the advantages and benefits of the technical solution provided by the present invention. However, the several specific embodiments described above are not intended to limit the present invention. Any reasonable modification and improvement of the present invention, combination of embodiments and equivalent replacement based on the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0105] The descriptions in this specification refer only to preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Furthermore, reference to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples" implies that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative descriptions of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or N embodiments or examples. Furthermore, those skilled in the art may combine and integrate the different embodiments or examples described in this specification, as well as features from different embodiments or examples, unless otherwise specified. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed to indicate or imply relative importance or to implicitly specify the number of the technical features indicated. Therefore, features designated "first" or "second" may explicitly or implicitly include at least one of these features. In the description of the present invention, "N" means at least two, for example, two, three, etc., unless otherwise specifically defined. Any process or method description in a flowchart or otherwise described herein can be understood to represent a module, segment, or portion of code comprising one or more executable instructions for implementing a custom logic function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may be performed in a different order than shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as will be understood by those skilled in the art to which the embodiments of the present invention pertain. The logic and / or steps represented in a flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing a logic function, can be embodied in any computer-readable medium for use by an instruction execution system, apparatus, or device (e.g., a computer-based system, a system including a processor, or other system that can fetch and execute instructions from an instruction execution system, apparatus, or device), or in conjunction with such instruction execution systems, apparatuses, or devices. For purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transmit a program for use by an instruction execution system, apparatus, or device, or in conjunction with such instruction execution systems, apparatuses, or devices. More specific examples (a non-exhaustive list) of computer-readable media include the following: an electrical connection having one or N wirings (electronic devices), a portable computer disk cartridge (magnetic devices), random access memory (RAM), read-only memory (ROM), erasable and programmable read-only memory (EPROM or flash memory), fiber optic devices, and portable compact disc read-only memory (CDROM).In addition, the computer-readable medium may even be paper or other suitable medium on which the program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other medium, then editing, interpreting, or processing in other suitable ways as necessary, and then storing it in a computer memory. It should be understood that the various parts of the present invention can be implemented with hardware, software, firmware, or a combination thereof. In the above embodiment, the N steps or methods can be implemented with software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented with hardware, as in another embodiment, any one of the following technologies known in the art or their combination can be used to implement: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0106] Those skilled in the art will appreciate that all or part of the steps carried out in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a program, and the program can be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment. In addition, the functional units in the various embodiments of the present invention can be integrated into a processing module, or each unit can exist physically alone, or two or more units can be integrated into one module. The above-mentioned integrated module can be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

Claims

1. A vacuum pumping method for a lunar soil and water ice simulation device under water and dust conditions, applied to a lunar simulation chamber vacuum system, the vacuum system comprising: Valves F1, F2, F3, and F4-2 connected in series for connecting the ice-soil material research chamber and the roughing system, and also including a valve F4-1 connected in parallel with the valve F4-2; Characterized in that the method comprises: Pre-cooling the simulation chamber vacuum system; Steps for opening valves F1, F2, F3, F4-2, and F4-1 to balance the pressure across the valves; The steps of closing F4-2 and starting the roughing machine front-stage dry pump; After the speed of the roughing machine front-stage dry pump is stabilized, the opening of F3 is adjusted to a preset value, and the valve F5 corresponding to the roughing machine front-stage dry pump is opened; When the pressure resistance of the simulation chamber vacuum system reaches a preset pressure value, close F1 and F5 and maintain the pressure, stop the roughing machine front-stage dry pump at the same time, and close F4-1 and F2; After the pressure maintenance is completed, F1, F2, F3 and F4-2 are opened. After the pressure on both sides of the roughing pipeline and the start gate valve is balanced, F4-2 is closed, F4-1 is opened, and the roughing machine front-stage dry pump is started; When the speed of the roughing machine front-stage dry pump reaches a preset speed value, turning on F3 and F5; When the vacuum degree of the simulation chamber vacuum system reaches the preset vacuum value, close F1 and F5, and maintain the pressure, stop the roughing machine front-stage dry pump, and close F2 and F4-1; Steps to start the cryopump and shut down F1, F2, and F4-1.

2. The vacuum pumping method for a lunar soil and water ice simulation device under water and dust conditions according to claim 1 is characterized in that: The pre-cooling is specifically as follows: turning on the cold trap water removal unit at the front end of the vacuum pump group and pre-cooling it.

3. The vacuum pumping method for a lunar soil and water ice simulation device under water and dust conditions according to claim 1 is characterized in that: The method further comprises the step of starting an electrostatic dust removal unit at the front end of the vacuum pump group.

4. The vacuum pumping method for a lunar soil and water ice simulation device under water and dust conditions according to claim 1 is characterized in that: In the step of opening the valves F1, F2, F3, F4-2 and F4-1, the valve opening is 100%.

5. The vacuum pumping method for a lunar soil and water ice simulation device under water and dust conditions according to claim 1 is characterized in that: The judgment condition for the stable rotation speed of the roughing machine front-stage dry pump is that the rotation speed reaches 120 Hz and is stable.

6. The vacuum pumping method for a lunar soil and water ice simulation device under water and dust conditions according to claim 1 is characterized in that: The preset pressure value is less than 50,000 Pa.

7. The vacuum pumping method for a lunar soil and water ice simulation device under water and dust conditions according to claim 1 is characterized in that: When the rotation speed of the roughing machine front-stage dry pump reaches a preset rotation speed value, the opening degree of F3 is opened to 5%.

8. The vacuum pumping method for a lunar soil and water ice simulation device under water and dust conditions according to claim 1 is characterized in that: The preset vacuum value is less than 5Pa.

9. The vacuum pumping method for a lunar soil and water ice simulation device under water and dust conditions according to claim 1 is characterized in that: The method further includes: when the vacuum degree of the simulation chamber vacuum system reaches a preset vacuum value, during the pressure maintaining process, if the vacuum degree is above 10 Pa, starting the roughing machine front-stage dry pump.

10. A lunar simulation chamber vacuum system, used to implement the method of claim 1, characterized in that: include: Lunar PSR comprehensive environment simulation cabin; An electrostatic dust removal unit and a cold trap water removal unit at the front end of the vacuum pump group are sequentially connected in series with the simulation cabin; Valves F1, F2, F3, F4-2, F5, Roots pump and dry pump are sequentially connected in series with the cold trap dewatering unit at the front end of the vacuum pump group; Also included is valve F4-1 connected in parallel with F4-2; A low temperature pump and a dry pump are sequentially connected in series with the cold trap dewatering unit at the front end of the vacuum pump group.

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