A lunar suit dust removal system and dust removal method based on electret

Abstract

The present invention discloses a lunar suit dust removal system and method based on electrets. The present invention sets an electret friction high-voltage generating module on the inner layer of the lunar suit, utilizes the astronaut's movement to frictionally polarize the electret, and generates a corresponding low-energy, high-amplitude voltage pulse to excite the outermost embedded flexible electrode module of the lunar suit to create a strong alternating standing wave electric field to drive away charged lunar dust. For small particles of charged lunar dust, a stripping polarization effect is used to generate stripping polarization charges on the bipolar electret body film, and a power-free uniform electric field is created between the bipolar electret and the electrode array to remove residual charged lunar dust. The present invention can achieve low power consumption, high electrostatic safety, and wide coverage to remove charged lunar dust. It can also prevent the charged lunar dust from secondary adhesion. It has the characteristics of good stability and high applicability, and is suitable for removing and protecting charged lunar dust adhered to the surface of the lunar suit.

Description

Technical Field

[0001] The present invention relates to charged lunar dust removal technology, and in particular to an electret-based lunar suit dust removal system and a dust removal method thereof. Background Art

[0002] The charged lunar dust blanketing the lunar surface poses one of the major challenges to establishing a human settlement on the Moon. Past Apollo missions have demonstrated that electrostatic forces can cause tiny, sharp particles of lunar dust to cling to lunar suits, causing serious hazards such as blurred vision, surface wear, and seal failure. Even more concerning, when lunar dust is carried aboard the lunar module, it can severely irritate astronauts' eyes and lungs, hindering mission performance. NASA research has shown that long-term exposure to lunar dust can cause respiratory and cardiovascular problems in astronauts. Therefore, effectively removing lunar dust from lunar suits is essential for protecting the health of astronauts and the smooth conduct of lunar operations.

[0003] The high vacuum, low gravity, and strong charge environment of the lunar surface make it difficult to remove micron-sized charged lunar dust using common terrestrial dust removal methods, such as mechanical brushing and fluid washing. To achieve highly stable, contactless, and efficient lunar dust removal, NASA has developed electric curtain dust removal technology, which it plans to incorporate into the latest generation of lunar suits. This technology involves energizing interdigitated electrodes woven into the outermost layer of the suit with a kilovolt AC high-voltage source, creating a strong, non-uniform alternating electric field. This electric field forces charged lunar dust adsorbed onto the suit's surface and dislodging it. However, the kilovolt-level voltage required by the electric curtain dust removal system significantly increases the suit's energy consumption. Furthermore, the contact of the outermost layer's wrinkles during astronaut movement makes electrostatic discharge (ESD) highly likely, generating high currents and potentially damaging suit equipment. To ensure the smooth implementation of lunar missions, a low-power, high-ESD-safe, and wide-area suit dust removal technology is urgently needed. Summary of the Invention

[0004] In response to the problems existing in the above-mentioned prior art, the present invention proposes a lunar suit dust removal system and dust removal method based on electret, which can achieve low power consumption, high electrostatic safety, and remove dust over a wide coverage area. It can also prevent the secondary adhesion of charged lunar dust and has the characteristics of good stability and high applicability.

[0005] The lunar suit includes, from the inside out, an underwear comfort layer, a thermal insulation layer, a liquid cooling layer, an airtight restriction layer, a vacuum insulation layer, and an outer protective layer; a mask is installed on the lunar suit corresponding to the astronaut's head to provide the astronaut with vision, and the mask is made of high-transmittance material; the electrical equipment in the lunar suit is connected to the common ground terminal of the lunar suit.

[0006] One object of the present invention is to provide a lunar suit dust removal system based on electret.

[0007] The lunar suit dust removal system based on electret of the present invention comprises: an embedded electret dust removal device and a separate electret dust removal device; wherein,

[0008] The embedded electret dust removal device includes an electret friction high-voltage generating module, a signal detection and control module, and an embedded flexible electrode module; wherein, multiple electret friction high-voltage generating modules are installed on the outer surface of the airtight restriction layer or the inner surface of the vacuum insulation layer of the lunar suit; the signal detection and control module is installed on the vacuum insulation layer; multiple embedded flexible electrode modules are installed on the outer surface fabric of the outer protective layer and the outer surface of the mask of the lunar suit; the electret friction high-voltage generating module is connected to the signal detection and control module, and the electret friction high-voltage generating module is connected to the embedded flexible electrode module through the signal detection and control module;

[0009] The electret friction high-voltage generating module includes a friction positive electret, a friction negative electret, a grounded back electrode, and a high-voltage back electrode; a friction negative electret is provided on the surface of the grounded back electrode; a friction positive electret is provided on the surface of the high-voltage back electrode; the work functions of the friction positive electret and the friction negative electret are different; the grounded back electrode is connected to the ground terminal of the lunar suit; the high-voltage back electrode and the grounded back electrode are parallel to each other and attached to the outer surface of the airtight restriction layer or the inner surface of the vacuum insulation layer, the surface of the friction positive electret is opposite to the surface of the friction negative electret, and there is an air gap between the two in the initial state;

[0010] The embedded flexible electrode module includes a first group and a second group of flexible comb electrodes, and the first group and the second group of flexible comb electrodes respectively include a comb spine electrode and a comb tooth electrode array; wherein the comb tooth electrode array includes a plurality of mutually parallel and equal-length long comb tooth electrodes, and the plurality of mutually parallel and equal-length long comb tooth electrodes are arranged in a one-dimensional direction parallel to the comb spine electrode to form a comb tooth electrode array; the long side of the comb spine electrode is perpendicular to the long side of the comb tooth electrode, and one side of the comb tooth electrode array is connected to the comb spine electrode; the comb tooth electrode arrays of the first group and the second group of flexible comb electrodes are parallel to each other and cross-arranged to form an electrode array arranged in a one-dimensional direction, and the one-dimensional arrangement of the electrode array is perpendicular to the long side of the long-strip comb tooth electrode;

[0011] The signal detection and control module includes a first conversion switch, a second conversion switch, a controller and a pulse voltage comparator; the first end of the first conversion switch is connected to the controller and to the first group of flexible comb electrodes, the second end is connected to the input end of the pulse voltage comparator and to the high-voltage back electrode of the electret friction high-voltage generation module, and the third end is connected to the ground end of the lunar suit; the first end of the second conversion switch is connected to the controller and to the second group of flexible comb electrodes, the second end is connected to the input end of the pulse voltage comparator and to the high-voltage back electrode of the electret friction high-voltage generation module, and the third end is connected to the ground end of the lunar suit;

[0012] The discrete electret dust removal device includes a bipolar electret module and an operation adapter module; the bipolar electret module is installed on the operation adapter module; the bipolar electret module includes a top protective film, a multi-layer peelable base film, a multi-layer bipolar electret film and a base film material; the base film material is installed on the surface of the operation adapter module; a structure in which a multi-layer peelable base film and a multi-layer bipolar electret film are alternately arranged on the base film material, a layer of peelable base film is arranged between each two adjacent layers of bipolar electret film, and a top protective film is arranged on the topmost bipolar electret film; the bipolar electret film includes a plurality of long strip-shaped peelable positive electret units and peelable negative electret units that are periodically and alternately arranged along a one-dimensional direction;

[0013] The lunar suit dust removal system includes automatic dust removal mode and manual dust removal mode;

[0014] In the automatic dust removal mode, under the external force of the astronaut's movement, the friction positive electret and the friction negative electret are deformed, so that they contact each other and generate friction, and electrons or ions are transferred on the contact surface, so that the relative surfaces of the friction positive electret and the friction negative electret are charged with equal amounts of opposite charges; the surface charge polarity of the friction positive electret and the friction negative electret that are in contact and friction with each other is determined by the work function. The electret with a large work function is negatively charged after friction, and the electret with a small work function is positively charged after friction; the opposite charges on the surfaces of the friction positive electret and the friction negative electret make the high voltage back electrode and the grounded back electrode An induced potential difference is formed between the electrodes, forming a high-voltage pulse; the pulse voltage comparator compares the peak value of the high-voltage pulse of the high-voltage back electrode with the threshold value. When the pulse voltage comparator detects that the peak value of the high-voltage pulse exceeds the threshold value, it is determined to be a valid high-voltage pulse, and the pulse voltage comparator sends a high-level pulse to the controller; the controller controls the first end of the first conversion switch to connect to the second end, and the controller controls the first end of the second conversion switch to connect to the third end, and transmits the high-voltage pulse to the first group of flexible comb electrodes of the embedded flexible electrode module through the first conversion switch, and the second group of flexible comb electrodes is connected to the ground end, thereby forming an electrode array between the two groups of flexible comb electrodes. an electric field in a determined direction in the one-dimensional arrangement direction of the electrode; when the peak value of the high-voltage pulse is detected again to exceed the threshold, it is determined to be a valid high-voltage pulse, and the pulse voltage comparator sends a high-level pulse to the controller; the controller controls the first end of the first conversion switch to connect to the third end, and the controller controls the first end of the second conversion switch to connect to the second end, and transmits the high-voltage pulse to the second group of flexible comb electrodes of the embedded flexible electrode module through the second conversion switch, and the first group of flexible comb electrodes is connected to the ground end, thereby forming an electric field in the opposite direction to the previous direction between the two groups of flexible comb electrodes; by continuously switching the gears of the first and second conversion switches accordingly, the first group of parallel electrodes High-voltage pulses are applied alternately to the first and second sets of flexible comb-shaped electrodes, forming an alternating non-uniform pulse standing wave electric field along the one-dimensional arrangement direction of the electrode array. The non-uniform pulse standing wave electric field decays exponentially in the direction perpendicular to the surface of the lunar suit. In the non-uniform pulse standing wave electric field, the charged lunar dust is driven away from the surface of the lunar suit by the Coulomb force and the dielectrophoretic force, thereby automatically removing the charged lunar dust with a particle size greater than 5μm without a high-voltage power supply. In the automatic dust removal mode, the lunar suit dust removal system does not require a high-voltage power supply, which greatly reduces the energy consumption required by the system. It can not only automatically remove the charged lunar dust, but also prevent the charged lunar dust from being adsorbed on the surface of the lunar suit.

[0015] In the manual dust removal mode, the controller controls the first end of the first conversion switch and the first end of the second conversion switch to connect to the third end, so that the first group and the second group of flexible comb electrodes of the embedded flexible electrode module are connected to the ground end; the astronaut holds the operation adapter module to peel off the top protective film of the discrete electret dust removal device or the peeling base film located on the outermost layer, so that the top protective film or the peeling base film and the corresponding bipolar electret film in the lower layer are peeled off polarized, and electrons or ions are transferred on the peeling surface, so that the peeling surface of the bipolar electret film carries a peeling polarization charge, and the polarity of the peeling polarization charge on the surface of the peeling positive electret unit and the peeling negative electret unit is opposite; the surface with the peeling polarization charge is placed facing the lunar suit, and the peeling positive electret unit and the peeling negative electret unit of the bipolar electret film are parallel to the comb electrodes of the embedded flexible electrode module. A discrete electret dust removal device is moved along the one-dimensional arrangement direction of the electrode array, and the surface of the bipolar electret film is ensured to be parallel to the plane of the electrode array; a parallel electrode structure is formed between the bipolar electret film and the flexible comb-shaped electrode, and a uniform electric field is formed between each comb-tooth electrode and the opposite peeling positive electret unit or peeling negative electret unit; when the bipolar electret film moves along the one-dimensional arrangement direction of the electrode array, the electric field accompanies the movement of the bipolar electret film, and the flexible comb-shaped electrode alternately faces the peeling positive electret unit and the peeling negative electret unit, forming an alternating traveling wave electric field in the gap between the bipolar electret film and the flexible comb-shaped electrode; the charged lunar dust is driven away from the surface of the lunar suit by the Coulomb force and the dielectrophoretic force in the alternating electric field, and adheres to the surface of the bipolar electret film, thereby realizing manual removal of charged lunar dust with a particle size of less than 5μm without a high-voltage power supply.

[0016] In automatic dust removal mode, the electrode array generates an electric field that decays exponentially in the direction perpendicular to the surface of the lunar suit; in manual dust removal mode, a uniform electric field is generated between the bipolar electret film and the electrode array in the direction perpendicular to the surface of the lunar suit; when the peak value of the high-voltage pulse in automatic dust removal mode is equal to the surface potential of the bipolar electret film in manual dust removal mode, the electric field in manual mode is stronger than that in automatic dust removal mode, and can achieve the removal of charged lunar dust below 5μm.

[0017] The electret triboelectric high-voltage generator module consists of a positive electret and a negative electret, each constructed of a thin film or fabric. The front side serves as the friction surface, while the back sides are coated with a high-voltage back electrode and a grounding back electrode, respectively. The front sides of the positive electret and the negative electret face each other. Based on the astronaut's movement characteristics, multiple electret triboelectric high-voltage generator modules are embedded in the lunar suit's shoulders, elbows, and hips, where movement is most frequent. The positive electret and the negative electret are made of one of the following materials: nylon, fluorinated ethylene propylene (FEP), polytetrafluoroethylene (PTFE), polyimide (PI), polyethylene terephthalate (PET), polypropylene (PP), polyethylene naphthalate (PEN), and silicone. The greater the difference in work function between the positive electret and the negative electret, the higher the peak voltage amplitude of the generated high-voltage pulse.

[0018] Compared to the high-voltage pulses generated by the existing high-voltage power supply module, the high-voltage pulses generated by the present invention, which do not require a power supply module, significantly reduce the energy required by the lunar suit's dust removal system. Furthermore, the present invention features high voltage amplitude and low energy, requiring a higher voltage amplitude to generate discharge. Even if static discharge occurs, it does not generate a large current that could damage the equipment, significantly improving the suit's electrostatic safety. The initial air gap between the surface of the friction-positive electret and the surface of the friction-negative electret is 0.5-2 mm.

[0019] The threshold value of the effective high-voltage pulse stored by the pulse voltage comparator in the signal detection and control module is 500~1000V. The high-level pulse sent by the pulse voltage comparator to the controller is 3.5~5V.

[0020] The first and second sets of flexible comb electrodes in the embedded flexible electrode module have the same width and equal spacing. The flexible comb electrodes are covered with an insulating coating to prevent electrical breakdown between the electrodes. The flexible comb electrodes utilize either flexible fabric interdigital electrodes or flexible transparent interdigital electrodes. Multiple embedded flexible electrode modules are installed in dust-prone areas of the lunar suit, such as the feet, calves, forearms, and face. In the feet, calves, and forearms, the flexible comb electrodes utilize flexible fabric interdigital electrodes, woven into the fabric of the suit's outer protective layer. These flexible fabric interdigital electrodes utilize conductive threads, such as copper, silver, or graphite. In the lunar suit's visor, the flexible comb electrodes utilize flexible fabric interdigital electrodes. The flexible transparent interdigital electrodes are embedded in the visor surface via sputtering followed by etching and are made of conductive transparent ITO. The insulating coating has a voltage withstand capability of ≥5kV and is optically transparent. It is made of one of epoxy, polyurethane, acrylic, and polyimide resins.

[0021] Because the electric field generated by the electrode array decays exponentially in the vertical direction in automatic mode, charged lunar dust particles ≤5μm are difficult to remove, requiring manual removal by astronauts. The discrete electret dust removal device's operating adapter module supports the deployment of the bipolar electret module, facilitating manual dust removal by astronauts. The operating adapter module utilizes a combination of gloves, a rag, and a brush. The work functions of the stripped base film and the bipolar electret film differ; the relationship between the three is: the work function of the positive electret unit stripped < the work function of the base film stripped < the work function of the negative electret unit stripped. The top protective film is made of the same material as the stripped base film. The greater the difference in work function between the stripped base film and the stripped positive electret and the stripped negative electret, the higher the charge of the electret after polarization. The surface charge polarity of mutually stripped materials is determined by their work function: materials with a large work function are negatively charged after stripping, while materials with a small work function are positively charged after stripping. After stripping, the surface polarization charge of adjacent electret units on the bipolar electret film is opposite in polarity. Multiple electret units arranged in a periodic one-dimensional pattern with alternating positive and negative polarity form a bipolar electret array. The width of the stripped positive and negative electret units is the same as that of the comb-tooth electrode, ranging from 100 μm to 1 mm.

[0022] The peeling base film is prepared by spin coating. The peeling positive electret unit and the peeling negative electret unit are prepared on the surface of the peeling base film by etching and deposition. The bipolar electret module is prepared layer by layer starting from the bottom layer until the top protective film. The peeling strength between the bipolar electret film and the peeling base film is regulated by controlling the gas pressure, temperature and plasma concentration during deposition. The peeling strength is 400~2000N / m, which not only ensures the bonding strength between the bipolar electret film and the peeling base film, but also makes it easy for astronauts to peel off the peeling base film.

[0023] The materials for stripping the positive polarity electret film, the negative polarity electret film and the base film in the discrete electret dust removal device are respectively one of nylon, fluorinated ethylene propylene FEP, polytetrafluoroethylene PTFE, polyimide PI, polyethylene terephthalate PET, polypropylene PP, polyethylene naphthalate PEN and silica gel.

[0024] When the astronauts manually remove dust, the gap between the bipolar electret film on the surface side facing the dust accumulation area of ​​the lunar suit and the surface of the dust accumulation area is 5.0~15mm.

[0025] A plurality of electret friction high-voltage generating modules are connected in parallel to the signal detection and control module; and a plurality of embedded flexible electrode modules are connected in parallel to the signal detection and control module.

[0026] Another object of the present invention is to provide a dust removal method for a lunar suit based on electret.

[0027] The method for removing dust from a lunar suit based on an electret of the present invention comprises the following steps:

[0028] 1. Set up the lunar suit dust removal system:

[0029] a) installing multiple electret friction high-voltage generating modules on the outer surface of the airtight restriction layer or the inner surface of the vacuum insulation layer of the lunar suit;

[0030] b) Installing the signal detection and control module on the vacuum insulation layer;

[0031] c) installing multiple embedded flexible electrode modules on the outer surface fabric of the outer protective layer and the outer surface of the mask of the lunar suit;

[0032] d) connecting the electret friction high-voltage generating module to the signal detection and control module, and the electret friction high-voltage generating module is connected to the embedded flexible electrode module through the signal detection and control module;

[0033] 2. Dust removal includes automatic dust removal mode and manual dust removal mode:

[0034] A. Automatic dust removal mode:

[0035] i. The first end of the first switch and the second switch are respectively connected to the third end of each;

[0036] ii. Under the external force of the astronaut's movement, the positive and negative electrets deform, causing them to contact and generate friction. Electrons or ions transfer at the contact surface, causing the opposing surfaces of the positive and negative electrets to carry equal amounts of opposite charges. The surface charge polarity of the positive and negative electrets in contact and friction is determined by their work function: electrets with a large work function become negatively charged after friction, while electrets with a small work function become positively charged after friction.

[0037] iii. friction of the positive electret and the negative electret surface charges, so that an induced potential difference is formed between the high-voltage back electrode and the grounded back electrode, forming a high-voltage pulse;

[0038] iv. The pulse voltage comparator compares the peak value of the high-voltage pulse of the high-voltage back electrode with the threshold. When the pulse voltage comparator detects that the peak value of the high-voltage pulse exceeds the threshold, it is determined to be a valid high-voltage pulse, and the pulse voltage comparator sends a high-level pulse to the controller;

[0039] v. The controller controls the first end of the first conversion switch to connect to the second end, and the controller controls the first end of the second conversion switch to connect to the third end, transmitting the high-voltage pulse to the first group of flexible comb electrodes of the embedded flexible electrode module through the first conversion switch, and connecting the second group of flexible comb electrodes to the ground end, thereby forming an electric field with a determined direction along the one-dimensional arrangement direction of the electrode array between the two groups of flexible comb electrodes;

[0040] vi. When the peak value of the high-voltage pulse is detected again to exceed the threshold, it is determined to be a valid high-voltage pulse, and the pulse voltage comparator sends a high-level pulse to the controller; the controller controls the first end of the first conversion switch to connect to the third end, and the controller controls the first end of the second conversion switch to connect to the second end, so that the high-voltage pulse is transmitted to the second group of flexible comb electrodes of the embedded flexible electrode module through the second conversion switch, and the first group of flexible comb electrodes is connected to the ground end, thereby forming an electric field in the opposite direction to the previous electric field between the two groups of flexible comb electrodes; by continuously switching the gears of the first and second conversion switches accordingly, the parallel first and second groups of flexible comb electrodes are alternately applied with high-voltage pulses, forming an alternating non-uniform pulse standing wave electric field along the one-dimensional arrangement direction of the electrode array, and the non-uniform pulse standing wave electric field exponentially decays in the direction perpendicular to the surface of the lunar suit;

[0041] vii. Charged lunar dust is driven off the surface of the lunar suit by Coulomb and dielectrophoretic forces in a non-uniform pulsed standing wave electric field, enabling the automatic removal of charged lunar dust larger than 5 μm without a high-voltage power source. In automatic dust removal mode, the lunar suit dust removal system not only automatically removes charged lunar dust but also prevents it from adhering to the suit surface.

[0042] B. Manual dust removal mode:

[0043] i. The controller controls the first end of the first switch and the second switch to be connected to the third end, so that the first group and the second group of flexible comb electrodes of the embedded flexible electrode module are connected to the ground end;

[0044] ii. The astronaut uses a handheld operating adapter module to peel off the top protective film or the outermost peeling base film of the discrete electret dust removal device, thereby causing peeling polarization between the top protective film or the peeling base film and the corresponding bipolar electret film underneath. Electron or ion transfer occurs on the peeling surface, causing the peeling surface of the bipolar electret film to carry a peeling polarization charge, and the peeling polarization charges on the surfaces of the positive and negative electret units are opposite in polarity.

[0045] iii. Positioning the surface with the stripped polarized charge directly against the lunar suit, moving the discrete electret dust removal device along the one-dimensional arrangement direction of the electrode array, aligning the stripped positive electret unit and the stripped negative electret unit of the bipolar electret film with the comb-tooth electrodes of the embedded flexible electrode module, and ensuring that the surface of the bipolar electret film is parallel to the plane of the electrode array; forming a parallel plate structure between the bipolar electret film and the flexible comb-shaped electrodes, and forming a uniform electric field between each comb-tooth electrode and the facing stripped positive electret unit or stripped negative electret unit;

[0046] iv. As the bipolar electret film moves along the one-dimensional arrangement of the electrode array, the electric field accompanies its movement. The flexible comb-shaped electrodes alternately face the stripped positive and negative electret units, forming an alternating traveling wave electric field in the gap between the bipolar electret film and the flexible comb-shaped electrodes. In the alternating electric field, charged lunar dust is driven off the surface of the lunar suit by Coulomb and dielectrophoretic forces and adheres to the surface of the bipolar electret film, enabling manual removal of charged lunar dust particles under 5 μm in size without the need for a high-voltage power supply.

[0047] v. When the surface of the current bipolar electret film is covered with charged lunar dust, peel off the outermost bipolar electret film to expose the next clean bipolar electret film, and continue to manually remove the charged lunar dust.

[0048] Advantages of the present invention:

[0049] The present invention sets an electret friction high-voltage generating module on the inner layer of the lunar suit, and uses the astronaut's movement friction to polarize the electret, generating corresponding low-energy and high-amplitude voltage pulses to stimulate the embedded flexible electrode module in the outermost layer of the lunar suit to create a strong alternating standing wave electric field to drive away the charged lunar dust; for small particles of charged lunar dust, stripping polarization charges are generated in the bipolar electret body film through the stripping polarization effect, and the power-free uniform electric field created between the bipolar electret and the electrode array is used to remove residual charged lunar dust; compared with the traditional electric curtain dust removal system that relies on high-voltage power supply, the lunar suit dust removal system and dust removal method proposed by the present invention can achieve low power consumption, high electrostatic safety and wide coverage to remove charged lunar dust, and can also prevent the secondary adhesion of charged lunar dust, with good stability and high applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 This is a structural block diagram of the lunar suit dust removal system based on electret of the present invention;

[0051] Figure 2 A schematic diagram of the distribution of embedded flexible electrode modules in a lunar suit according to an embodiment of the electret-based lunar suit dust removal system of the present invention;

[0052] Figure 3A cross-sectional view of an electret friction high-voltage generating module of an electret-based lunar suit dust removal system according to an embodiment of the present invention;

[0053] Figure 4 Schematic diagram of an embedded flexible electrode module of an embodiment of the electret-based lunar suit dust removal system of the present invention; wherein (a) is a top view of a flexible comb electrode embedded in the surface protective layer fabric of the lunar suit, (b) is a cross-sectional view of the flexible comb electrode embedded in the surface protective layer fabric of the lunar suit, (c) is a top view of the flexible comb electrode embedded in the face mask of the lunar suit, and (d) is a cross-sectional view of the flexible comb electrode embedded in the face mask of the lunar suit;

[0054] Figure 5 Schematic diagram of a discrete electret dust removal device of one embodiment of the electret-based lunar suit dust removal system of the present invention, wherein (a) is a schematic diagram of a glove as an operating adapter module, and (b) is a schematic diagram of the structure of a bipolar electret array;

[0055] Figure 6 Schematic diagram of the stripping polarization of a discrete stripping polarization device of one embodiment of the electret-based lunar suit dust removal system of the present invention, wherein (a) is a schematic diagram of the stripping polarization of the outermost bipolar electret, and (b) is a schematic diagram of the stripping polarization of the inner bipolar electret;

[0056] Figure 7 This is a schematic diagram showing the state of the electret friction high-voltage module generating high-voltage pulses in one embodiment of the electret-based lunar suit dust removal system of the present invention, wherein (a) is a state diagram of the friction of the positive polarity electret and the friction of the negative polarity electret, and (b) is a curve diagram of the high-voltage pulse;

[0057] Figure 8 Schematic diagram of the automatic dust removal mode of the electret-based lunar suit dust removal system of the present invention, wherein (a) is a schematic diagram of the electric field direction of the surface fabric of the lunar suit's surface protective layer and the force and movement direction of the charged lunar dust during a single high-voltage pulse, (b) is a schematic diagram of the electric field direction of the surface fabric of the lunar suit's surface protective layer and the force and movement direction of the charged lunar dust during a secondary high-voltage pulse, (c) is a schematic diagram of the electric field direction of the lunar suit's face mask and the force and movement direction of the charged lunar dust during a single high-voltage pulse, and (d) is a schematic diagram of the electric field direction of the lunar suit's face mask and the force and movement direction of the charged lunar dust during a secondary high-voltage pulse;

[0058] Figure 9 This is a schematic diagram of the manual dust removal mode of the electret-based lunar suit dust removal system of the present invention, wherein (a) is a schematic diagram of the force and movement direction of the charged lunar dust when the positive polarity electret faces the flexible comb electrode, and (b) is a schematic diagram of the force and movement direction of the charged lunar dust when the negative polarity electret faces the flexible comb electrode after directional movement. DETAILED DESCRIPTION

[0059] The present invention will be further described below through specific embodiments in conjunction with the accompanying drawings.

[0060] The lunar suit dust removal system based on electret in this embodiment includes: an embedded electret dust removal device and a separate electret dust removal device; Figure 1 As shown, the embedded electret dust removal device includes: an electret friction high voltage generating module, a signal detection and control module and an embedded flexible electrode module; wherein, Figure 2 As shown, multiple electret friction high-voltage generating modules are respectively installed on the outer surface of the airtight restriction layer of the lunar suit or the inner surface of the vacuum insulation layer; the signal detection and control module is installed on the vacuum insulation layer; multiple embedded flexible electrode modules are respectively installed on the outer surface of the fabric 001 of the outer protective layer of the lunar suit 000 and the outer surface of the mask 002; the electret friction high-voltage generating module is connected to the signal detection and control module, and the electret friction high-voltage generating module is connected to the embedded flexible electrode module through the signal detection and control module;

[0061] like Figure 3 As shown, the electret friction high-voltage generating module includes a friction positive electret 104, a friction negative electret 105, a grounded back electrode 106 and a high-voltage back electrode 103; a friction negative electret is provided on the surface of the grounded back electrode; a friction positive electret is provided on the surface of the high-voltage back electrode; the work function of the friction positive electret and the friction negative electret are different; the grounded back electrode is connected to the ground terminal of the lunar suit; the high-voltage back electrode and the grounded back electrode are parallel to each other and attached to the outer surface of the airtight restriction layer or the inner surface of the vacuum insulation layer, and the surface of the friction positive electret is opposite to the surface of the friction negative electret, and there is a distance between the two;

[0062] like Figure 4As shown, the embedded flexible electrode module includes a first group and a second group of flexible comb electrodes 100 and 101, and the first group and the second group of flexible comb electrodes include a comb ridge electrode and a comb tooth electrode array, respectively; wherein the comb tooth electrode array includes a plurality of mutually parallel and equal-length long comb tooth electrodes, and a plurality of mutually parallel and equal-length long comb tooth electrodes are arranged along a one-dimensional direction parallel to the comb ridge electrode to form a comb tooth electrode array; the comb ridge electrode is perpendicular to the comb tooth electrode, and one side of the comb tooth electrode array is connected to the comb ridge electrode; the comb tooth electrode arrays of the first group and the second group of flexible comb electrodes are parallel to each other and cross to form an electrode array arranged along a one-dimensional direction; as shown in 4 (a) and (b), the first group and the second group of flexible comb electrodes The flexible comb electrodes 100 and 101 are made of conductive metal wires, such as copper wires, silver wires, or conductive carbon fiber wires, and are woven into the surface protective layer fabric 102 of the lunar suit. The positively charged lunar dust 400 and the negatively charged lunar dust 401 are deposited on the insulating dielectric coating 201 on the surface of the fabric. As shown in Figures 4 (c) and (d), the first and second groups of flexible comb electrodes 100 and 101 at the mask are made of ITO conductive transparent material and are embedded in the lunar suit mask material 200 by sputtering and then etching. 201 is the covering insulating dielectric coating. The positively charged lunar dust 400 and the negatively charged lunar dust 401 are deposited on the insulating dielectric coating 201 of the lunar suit mask.

[0063] The signal detection and control module includes a first conversion switch, a second conversion switch, a controller and a pulse voltage comparator; the first conversion switch and the second conversion switch respectively include a first end 1, a second end 2 and a third end 3; the first end of the first conversion switch is connected to the controller and to the first group of flexible comb electrodes, the second end is connected to the input end of the pulse voltage comparator and to the high-voltage back electrode of the electret friction high-voltage generation module, and the third end is connected to the ground end of the lunar suit; the first end of the second conversion switch is connected to the controller and to the second group of flexible comb electrodes, the second end is connected to the input end of the pulse voltage comparator and to the high-voltage back electrode of the electret friction high-voltage generation module, and the third end is connected to the ground end of the lunar suit;

[0064] like Figure 5 As shown, the discrete electret dust removal device includes a bipolar electret module 301 and an operation adapter module 300; the bipolar electret module is installed on the operation adapter module; the bipolar electret module includes a top protective film 302, a multi-layer peeling base film 303, a multi-layer bipolar electret film 304 and a base film material 305; a structure of alternating multi-layer peeling base films and multi-layer bipolar electret films is sequentially arranged on the base film material, a layer of peeling base film is arranged between each two adjacent layers of bipolar electret film, and a top protective film is arranged on the topmost bipolar electret film; the bipolar electret film includes a plurality of periodically alternating long strips of peeling positive polarity electret units and peeling negative polarity electret units.

[0065] The astronauts hold the operating adapter module and peel off the top protective film of the discrete electret dust removal device. Figure 6 (a) or peeling of the basement membrane, as shown Figure 6 As shown in (b), the top protective film or the peeling base film is peeled off and the corresponding lower bipolar electret film is peeled off polarized, and electron or ion transfer occurs on the peeling surface, so that the peeling surface of the bipolar electret film is charged, and the charge polarity on the surface of the peeling positive polarity electret unit and the peeling negative polarity electret unit is opposite, namely positive charge + and negative charge −, respectively.

[0066] The lunar suit dust removal system includes automatic dust removal mode and manual dust removal mode:

[0067] In automatic dust removal mode, Figure 7 As shown in (a), under the external force of the astronaut's movement, the lunar suit bends and stretches with the movement of the human body, and the friction positive electret and the friction negative electret are deformed from the original Figure 7 The separation state shown in the figure above (a) becomes Figure 7 (a) is in contact with each other as shown in the figure below, and friction occurs. Electrons or ions are transferred on the contact surface, so that the friction surfaces of the friction positive electret and the friction negative electret carry equal amounts of opposite charges. The surface charge polarity of the friction positive electret and the friction negative electret in contact and friction with each other is determined by the work function. The electret with a large work function is negatively charged after friction, and the electret with a small work function is positively charged after friction. The opposite charges on the surfaces of the friction positive electret and the friction negative electret form an induced potential difference between the high-voltage back electrode and the grounded back electrode, forming a high-voltage pulse U, as shown in Figure 2. Figure 7 As shown in (b); the pulse voltage comparator compares the peak value of the high-voltage pulse of the high-voltage back electrode with the threshold value. When the pulse voltage comparator detects that the peak value of the high-voltage pulse exceeds the threshold value, it is determined to be a valid high-voltage pulse, and the pulse voltage comparator sends a high-level pulse to the controller; the controller controls the first end of the first conversion switch to connect to the second end, and the controller controls the first end of the second conversion switch to connect to the third end, and transmits the high-voltage pulse to the first group of flexible comb electrodes of the embedded flexible electrode module through the first conversion switch, and the second group of flexible comb electrodes is grounded, thereby forming an electric field with a determined direction along the one-dimensional arrangement direction of the electrode array between the two groups of flexible comb electrodes, as shown in FIG. Figure 8As shown in (a); when the peak value of the high-voltage pulse is detected again to exceed the threshold, it is determined to be a valid high-voltage pulse, and the pulse voltage comparator sends a high-level pulse to the controller; the controller controls the first end of the first conversion switch to connect to the third end, and the controller controls the first end of the second conversion switch to connect to the second end, and the high-voltage pulse is transmitted to the second group of flexible comb electrodes of the embedded flexible electrode module through the second conversion switch, and the first group of flexible comb electrodes is grounded, thereby forming an electric field in the opposite direction to the previous one, as shown in FIG. Figure 8 As shown in (b); by continuously switching the gears of the first and second conversion switches, high-voltage pulses are applied alternately to the first and second parallel groups of flexible comb-shaped electrodes, respectively, forming an alternating non-uniform pulse standing wave electric field along the one-dimensional arrangement direction of the electrode array. The non-uniform pulse standing wave electric field exponentially decays in the direction perpendicular to the surface of the lunar suit; specifically, as shown in Figure 8 As shown, the outer surface of the lunar suit is xoz The plane, perpendicular to the outward direction of the lunar suit, is defined as y Direction, based on electromagnetic theory, when high voltage pulse U When the electrode array is loaded, the non-uniform standing wave electric field distribution in the upper space can be expressed in the form of Fourier series:

[0068] (1)

[0069] Where, E x ( x,y,t ) is the electric field in the x direction that changes with time t, E y ( x,y,t ) is the electric field in the y direction that changes with time t, w is the width of the comb electrode, g is the spacing between adjacent comb electrodes, λ =2( w + g ) is the spatial wavelength, k n =2 πn / λ is the spatial frequency, A n = [ λ / n 2 π 2 b ]{cos( nπw / λ )-cos[ nπ ( w + 2 g ) / λ ]} are Fourier coefficients, fis the pulse voltage frequency. It can be seen that the electric field changes periodically in the horizontal direction and in the direction perpendicular to the lunar suit. y In the axial direction, the field strength decreases exponentially.

[0070] The charged lunar dust is driven away from the surface of the lunar suit by the Coulomb force and the dielectrophoretic force in the non-uniform pulse standing wave electric field, realizing the automatic removal of charged lunar dust with a particle size greater than 5μm without a high-voltage power supply; in the automatic dust removal mode, the lunar suit dust removal system can not only automatically remove the charged lunar dust, but also prevent the charged lunar dust from being adsorbed on the surface of the lunar suit; the automatic dust removal principle of the lunar suit mask is the same as this. When continuous high-voltage pulses are generated, the switch settings and the force conditions of the charged lunar dust are as follows Figure 8 As shown in (c) and (d);

[0071] In the manual dust removal mode, the controller controls the first end of the first conversion switch and the second conversion switch to connect to the third end, so that the first group and the second group of flexible comb electrodes of the embedded flexible electrode module are grounded; the astronaut holds the operating adapter module, and the charged surface of the stripped bipolar electret film faces the lunar suit, and moves the discrete electret dust removal device along the one-dimensional arrangement direction of the electrode array. The stripped positive electret unit and the stripped negative electret unit of the bipolar electret film are parallel to the comb electrodes of the embedded flexible electrode module, and ensure that the surface of the bipolar electret film is parallel to the plane where the electrode array is located. The plane where the electrode array is located is the surface of the lunar suit, such as Figure 9 As shown in (a), a parallel plate structure is formed between the positive electret and the flexible comb-shaped electrode. The electret is polarized to generate a uniform electric field in the y-axis direction. Specifically, based on electromagnetic theory, when the surface potentials of the bipolar electret are ±U respectively, the uniform electric field distribution in the space above the electrode can be expressed as:

[0072] (2)

[0073] Where, d is the distance between the bipolar electret surface and the flexible comb electrode, v is the movement speed of the bipolar electret film; the one-dimensional arrangement direction along the electrode array after peeling is x Axis movement, when the negative electret is facing the flexible comb electrode, Figure 9As shown in (b), a uniform electric field forms between the negative electret and the electrode gap. A parallel plate structure forms between the bipolar electret film and the flexible comb-shaped electrodes, converting the exponentially decaying electric field into a uniform electric field and enhancing the dust removal electric field strength. As the bipolar electret film moves along the one-dimensional arrangement of the electrode array, the electric field accompanies its movement, forming an alternating traveling wave electric field in the gap between the bipolar electret film and the flexible comb-shaped electrodes. In this alternating traveling wave electric field, charged lunar dust is driven off the adsorption surface by Coulomb and dielectrophoretic forces and reattaches to the bipolar electret film. When a large amount of lunar dust adheres to the outermost layer of the bipolar electret film, astronauts can peel it off, revealing the next clean layer, enabling manual removal of charged lunar dust particles under 5μm in size without a high-voltage power supply.

[0074] In this embodiment, the materials of the friction positive electret and the friction negative electret are nylon and polytetrafluoroethylene (PTFE), respectively; the materials of the stripping positive electret film and the stripping negative electret film as well as the stripping base film in the discrete electret dust removal device are nylon, polytetrafluoroethylene (PTFE), and polypropylene (PP), respectively; the width of the stripping positive electret unit and the stripping negative electret unit is the same as the width of the comb electrode, which is 500 μm; the initial air gap between the surface of the friction positive electret and the surface of the friction negative electret is 1 mm; the voltage resistance of the insulating coating is ≥5 kV, and epoxy resin is used.

[0075] Finally, it should be noted that the purpose of disclosing the embodiments is to facilitate a further understanding of the present invention. However, those skilled in the art will appreciate that various substitutions and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the present invention should not be limited to the contents disclosed in the embodiments; the scope of protection claimed by the present invention shall be determined by the scope defined in the claims.

Claims

1. An electret-based lunar suit dust removal system. The suit consists of, from the inside out, an inner comfort layer, a thermal insulation layer, a liquid cooling layer, an airtight restriction layer, a vacuum insulation layer, and an outer protective layer. A mask is installed over the astronaut's head to provide vision. The mask is made of high-transmittance material. The electrical equipment in the lunar suit is connected to the common lunar suit ground terminal, which is characterized by: The lunar suit dust removal system includes: an embedded electret dust removal device and a separate electret dust removal device; wherein, The embedded electret dust removal device includes an electret friction high-voltage generating module, a signal detection and control module, and an embedded flexible electrode module; wherein, multiple electret friction high-voltage generating modules are installed on the outer surface of the airtight restriction layer or the inner surface of the vacuum insulation layer of the lunar suit; the signal detection and control module is installed on the vacuum insulation layer; multiple embedded flexible electrode modules are installed on the outer surface fabric of the outer protective layer and the outer surface of the mask of the lunar suit; the electret friction high-voltage generating module is connected to the signal detection and control module, and the electret friction high-voltage generating module is connected to the embedded flexible electrode module through the signal detection and control module; The electret friction high-voltage generating module includes a friction positive electret, a friction negative electret, a grounded back electrode, and a high-voltage back electrode; a friction negative electret is provided on the surface of the grounded back electrode; a friction positive electret is provided on the surface of the high-voltage back electrode; the work functions of the friction positive electret and the friction negative electret are different; the grounded back electrode is connected to the ground terminal of the lunar suit; the high-voltage back electrode and the grounded back electrode are parallel to each other and attached to the outer surface of the airtight restriction layer or the inner surface of the vacuum insulation layer, the surface of the friction positive electret is opposite to the surface of the friction negative electret, and there is an air gap between the two in the initial state; The embedded flexible electrode module includes a first group and a second group of flexible comb electrodes, and the first group and the second group of flexible comb electrodes respectively include a comb spine electrode and a comb tooth electrode array; wherein the comb tooth electrode array includes a plurality of mutually parallel and equal-length long comb tooth electrodes, and the plurality of mutually parallel and equal-length long comb tooth electrodes are arranged in a one-dimensional direction parallel to the comb spine electrode to form a comb tooth electrode array; the long side of the comb spine electrode is perpendicular to the long side of the comb tooth electrode, and one side of the comb tooth electrode array is connected to the comb spine electrode; the comb tooth electrode arrays of the first group and the second group of flexible comb electrodes are parallel to each other and cross-arranged to form an electrode array arranged in a one-dimensional direction, and the one-dimensional arrangement of the electrode array is perpendicular to the long side of the long-strip comb tooth electrode; The signal detection and control module includes a first conversion switch, a second conversion switch, a controller and a pulse voltage comparator; the first end of the first conversion switch is connected to the controller and to the first group of flexible comb electrodes, the second end is connected to the input end of the pulse voltage comparator and to the high-voltage back electrode of the electret friction high-voltage generation module, and the third end is connected to the ground end of the lunar suit; the first end of the second conversion switch is connected to the controller and to the second group of flexible comb electrodes, the second end is connected to the input end of the pulse voltage comparator and to the high-voltage back electrode of the electret friction high-voltage generation module, and the third end is connected to the ground end of the lunar suit; The discrete electret dust removal device includes a bipolar electret module and an operation adapter module; the bipolar electret module is installed on the operation adapter module; the bipolar electret module includes a top protective film, a multi-layer peelable base film, a multi-layer bipolar electret film and a base film material; the base film material is installed on the surface of the operation adapter module; a structure in which a multi-layer peelable base film and a multi-layer bipolar electret film are alternately arranged on the base film material, a layer of peelable base film is arranged between each two adjacent layers of bipolar electret film, and a top protective film is arranged on the topmost bipolar electret film; the bipolar electret film includes a plurality of long strip-shaped peelable positive electret units and peelable negative electret units that are periodically and alternately arranged along a one-dimensional direction; The lunar suit dust removal system includes automatic dust removal mode and manual dust removal mode; In the automatic dust removal mode, under the external force of the astronaut's movement, the friction positive electret and the friction negative electret are deformed, so that they come into contact with each other and generate friction, and electrons or ions are transferred on the contact surface, so that the relative surfaces of the friction positive electret and the friction negative electret are charged with equal amounts of opposite charges; the surface charge polarity of the friction positive electret and the friction negative electret in contact and friction with each other is determined by the work function; the opposite charges on the surfaces of the friction positive electret and the friction negative electret form an induced potential difference between the high-voltage back electrode and the grounded back electrode, forming a high-voltage pulse; the pulse voltage ratio The comparator compares the peak value of the high-voltage pulse of the high-voltage back electrode with the threshold value. When the pulse voltage comparator detects that the peak value of the high-voltage pulse exceeds the threshold value, it is determined to be a valid high-voltage pulse, and the pulse voltage comparator sends a high-level pulse to the controller; the controller controls the first end of the first conversion switch to connect to the second end, and the controller controls the first end of the second conversion switch to connect to the third end, and transmits the high-voltage pulse to the first group of flexible comb electrodes of the embedded flexible electrode module through the first conversion switch, and the second group of flexible comb electrodes is connected to the ground end, thereby forming an electric field with a determined direction along the one-dimensional arrangement direction of the electrode array between the two groups of flexible comb electrodes. ; When the peak value of the high-voltage pulse is detected to exceed the threshold again, it is determined to be a valid high-voltage pulse, and the pulse voltage comparator sends a high-level pulse to the controller; the controller controls the first end of the first conversion switch to connect to the third end, and the controller controls the first end of the second conversion switch to connect to the second end, and the high-voltage pulse is transmitted to the second group of flexible comb electrodes of the embedded flexible electrode module through the second conversion switch, and the first group of flexible comb electrodes is connected to the ground end, thereby forming an electric field in the opposite direction to the previous one between the two groups of flexible comb electrodes; by continuously switching the gears of the first and second conversion switches, the parallel first and second groups of flexible comb electrodes are connected. High-voltage pulses are applied alternately to the electrodes, forming an alternating non-uniform pulse standing wave electric field along the one-dimensional arrangement direction of the electrode array. The non-uniform pulse standing wave electric field decays exponentially in the direction perpendicular to the surface of the lunar suit. In the non-uniform pulse standing wave electric field, the charged lunar dust is driven off the surface of the lunar suit by the Coulomb force and the dielectrophoretic force, achieving automatic removal of charged lunar dust with a particle size greater than 5μm without a high-voltage power supply. In the automatic dust removal mode, the lunar suit dust removal system does not require a high-voltage power supply, greatly reducing the energy consumption required by the system. It can not only automatically remove charged lunar dust, but also prevent charged lunar dust from adsorbing on the surface of the lunar suit. In the manual dust removal mode, the controller controls the first ends of the first conversion switch and the second conversion switch to connect to their respective third ends, so that the first group and the second group of flexible comb electrodes of the embedded flexible electrode module are connected to the ground end; the astronaut holds the operation adapter module to peel off the top protective film of the discrete electret dust removal device or the peeling base film located on the outermost layer, so that the top protective film or the peeling base film and the corresponding bipolar electret film in the lower layer are peeled polarized, and electrons or ions are transferred on the peeling surface, so that the peeling surface of the bipolar electret film carries a peeling polarization charge, and the polarity of the peeling polarization charge on the surface of the peeling positive electret unit and the peeling negative electret unit is opposite; the surface with the peeling polarization charge is facing the lunar suit, and the peeling positive electret unit and the peeling negative electret unit of the bipolar electret film are aligned with the comb electrodes of the embedded flexible electrode module. The discrete electret dust removal device is moved along the one-dimensional arrangement direction of the electrode array, and the surface of the bipolar electret film is ensured to be parallel to the plane of the electrode array; a parallel plate structure is formed between the bipolar electret film and the flexible comb-shaped electrode, and a uniform electric field is formed between each comb-tooth electrode and the opposite peeling positive electret unit or peeling negative electret unit; when the bipolar electret film moves along the one-dimensional arrangement direction of the electrode array, the electric field accompanies the movement of the bipolar electret film, and the flexible comb-shaped electrode alternately faces the peeling positive electret unit and the peeling negative electret unit, forming an alternating traveling wave electric field in the gap between the bipolar electret film and the flexible comb-shaped electrode; the charged lunar dust is driven away from the surface of the lunar suit by the Coulomb force and the dielectrophoretic force in the alternating electric field, and adheres to the surface of the bipolar electret film, thereby realizing manual removal of charged lunar dust with a particle size of less than 5μm without a high-voltage power supply.

2. The lunar suit dust removal system according to claim 1, characterized in that: The friction positive electret and the friction negative electret of the electret friction high voltage generating module are thin film structures or fabric structures, the front side is the friction surface, and the back side is respectively plated with a high voltage back electrode and a grounding back electrode; the front sides of the friction positive electret and the friction negative electret are opposite to each other.

3. The lunar suit dust removal system according to claim 1, wherein: The materials of the friction positive electret and the friction negative electret are respectively one of nylon, fluorinated ethylene propylene FEP, polytetrafluoroethylene PTFE, polyimide PI, polyethylene terephthalate PET, polypropylene PP, polyethylene naphthalate PEN and silica gel.

4. The lunar suit dust removal system according to claim 1, wherein: The flexible comb-shaped electrodes are flexible fabric interdigital electrodes or flexible transparent interdigital electrodes; the flexible fabric interdigital electrodes are conductive threads; Flexible transparent interdigital electrodes are embedded in the mask surface of the lunar suit by sputtering and then etching.

5. The lunar suit dust removal system according to claim 1, wherein: The width of the stripping positive polarity electret unit and the stripping negative polarity electret unit is the same as the width of the comb-tooth electrode, and the width is 100 μm to 1 mm.

6. The lunar suit dust removal system according to claim 1, wherein: The operation adaptation module adopts one of gloves, rags and brush heads.

7. The lunar suit dust removal system according to claim 1, wherein: The work functions of the stripping base film and the bipolar electret film are different, and the relationship between the three is: work function of stripping the positive electret unit < work function of stripping the base film < work function of stripping the negative electret unit.

8. The lunar suit dust removal system according to claim 1, wherein: The materials for stripping the positive polarity electret film, the negative polarity electret film and the base film in the discrete electret dust removal device are respectively one of nylon, fluorinated ethylene propylene FEP, polytetrafluoroethylene PTFE, polyimide PI, polyethylene terephthalate PET, polypropylene PP, polyethylene naphthalate PEN and silica gel.

9. The lunar suit dust removal system according to claim 1, wherein: It also includes an insulating coating, which covers the surface of the flexible comb-shaped electrode; the insulating coating is made of one of epoxy resin, polyurethane resin and acrylic resin polyimide.

10. A dust removal method for a lunar suit dust removal system based on electret according to claim 1, characterized in that: The dust removal method comprises the following steps:

1. Set up the lunar suit dust removal system: a) installing multiple electret friction high-voltage generating modules on the outer surface of the airtight restriction layer or the inner surface of the vacuum insulation layer of the lunar suit; b) installing the signal detection and control module on the vacuum insulation layer; c) installing multiple embedded flexible electrode modules on the outer surface fabric of the outer protective layer and the outer surface of the mask of the lunar suit; d) connecting the electret friction high-voltage generating module to the signal detection and control module, and the electret friction high-voltage generating module is connected to the embedded flexible electrode module through the signal detection and control module; 2. Dust removal includes automatic dust removal mode and manual dust removal mode: A. Automatic dust removal mode: i. The first end of the first switch and the second switch are respectively connected to the third end of each; ii. Under the external force of the astronaut's movement, the positive and negative electrets deform, causing them to contact and generate friction. Electrons or ions transfer at the contact surface, causing the opposing surfaces of the positive and negative electrets to carry equal amounts of opposite charges. The surface charge polarity of the positive and negative electrets in contact and friction is determined by their work function. iii. friction of the positive electret and the negative electret surface charges, so that an induced potential difference is formed between the high-voltage back electrode and the grounded back electrode, forming a high-voltage pulse; iv. The pulse voltage comparator compares the peak value of the high-voltage pulse of the high-voltage back electrode with the threshold. When the pulse voltage comparator detects that the peak value of the high-voltage pulse exceeds the threshold, it is determined to be a valid high-voltage pulse, and the pulse voltage comparator sends a high-level pulse to the controller; v. The controller controls the first end of the first conversion switch to connect to the second end, and the controller controls the first end of the second conversion switch to connect to the third end, transmitting the high-voltage pulse to the first group of flexible comb electrodes of the embedded flexible electrode module through the first conversion switch, and connecting the second group of flexible comb electrodes to the ground end, thereby forming an electric field with a determined direction along the one-dimensional arrangement direction of the electrode array between the two groups of flexible comb electrodes; vi. When the peak value of the high-voltage pulse is detected to exceed the threshold again, it is determined to be a valid high-voltage pulse, and the pulse voltage comparator sends a high-level pulse to the controller; the controller controls the first end of the first conversion switch to connect to the third end, and the controller controls the first end of the second conversion switch to connect to the second end, and transmits the high-voltage pulse to the second group of flexible comb electrodes of the embedded flexible electrode module through the second conversion switch, and the first group of flexible comb electrodes is connected to the ground end, thereby forming an electric field in the opposite direction to the previous direction between the two groups of flexible comb electrodes; by continuously switching the gears of the first and second conversion switches, the parallel first High-voltage pulses are applied alternately to the first and second sets of flexible comb-shaped electrodes, forming an alternating, non-uniform pulsed standing wave electric field along the one-dimensional arrangement of the electrode array. The non-uniform pulsed standing wave electric field decays exponentially in a direction perpendicular to the surface of the lunar suit. In the non-uniform pulsed standing wave electric field, charged lunar dust is driven off the surface of the lunar suit by Coulomb and dielectrophoretic forces, enabling the automatic removal of charged lunar dust larger than 5 μm without a high-voltage power supply. In automatic dust removal mode, the lunar suit dust removal system not only automatically removes charged lunar dust but also prevents it from adhering to the surface of the lunar suit. B. Manual dust removal mode: i. The controller controls the first end of the first switch and the second switch to connect the third end of each, so that the first group and the second group of flexible comb electrodes of the embedded flexible electrode module are connected to the ground end; ii. The astronaut holds the operating adapter module and peels off the top protective film or the outermost peeling base film of the discrete electret dust removal device, thereby causing peeling polarization between the top protective film or the peeling base film and the corresponding bipolar electret film underneath. Electrons or ions are transferred on the peeling surface, causing the peeling surface of the bipolar electret film to carry peeling polarization charges. Furthermore, the polarity of the stripping polarization charge on the surface of the stripping positive polarity electret unit and the stripping negative polarity electret unit is opposite; iii. Positioning the surface with the stripped polarized charge directly against the lunar suit, moving the discrete electret dust removal device along the one-dimensional arrangement direction of the electrode array, aligning the stripped positive electret unit and the stripped negative electret unit of the bipolar electret film with the comb-tooth electrodes of the embedded flexible electrode module, and ensuring that the surface of the bipolar electret film is parallel to the plane of the electrode array; forming a parallel plate structure between the bipolar electret film and the flexible comb-shaped electrodes, and forming a uniform electric field between each comb-tooth electrode and the facing stripped positive electret unit or stripped negative electret unit; iv. As the bipolar electret film moves along the one-dimensional arrangement of the electrode array, the electric field accompanies its movement. The flexible comb-shaped electrodes alternately face the stripped positive and negative electret units, forming an alternating traveling wave electric field in the gap between the bipolar electret film and the flexible comb-shaped electrodes. In the alternating electric field, charged lunar dust is driven off the surface of the lunar suit by Coulomb and dielectrophoretic forces and adheres to the surface of the bipolar electret film, enabling manual removal of charged lunar dust particles under 5 μm in size without the need for a high-voltage power supply. v. When the surface of the current bipolar electret film is covered with charged lunar dust, peel off the outermost bipolar electret film to expose the next clean bipolar electret film, and continue to manually remove the charged lunar dust.

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