Pressure regulating system for lunar sample storage device

Abstract

The disclosure provides a kind of lunar sample storage device air pressure regulating system, comprising: moon sample storage unit is configured to store lunar sample and maintain micro-positive pressure environment to isolate atmospheric pollutants;Pressure regulating unit is connected with the moon sample storage unit, configured to adjust the pressure in the moon sample storage unit to stabilize the micro-positive pressure environment in the moon sample storage unit, comprising: negative pressure buffer tank configured to receive the gas discharged when the pressure in the moon sample storage tank is too high, and positive pressure air supplement tank configured to supplement gas when the pressure in the moon sample storage tank is too low;Gas supply unit is connected with the pressure regulating unit, configured to provide high-purity nitrogen;Pressure monitoring unit is configured to monitor the pressure in the moon sample storage unit and the pressure regulating unit respectively;Control unit is electrically connected with the pressure regulating unit, gas supply unit and pressure monitoring unit respectively, configured to control the operation of each unit according to pressure monitoring data.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of storage device control, in particular to a gas pressure regulating system of a lunar sample storage device. BACKGROUND

[0002] The nitrogen pressure in the lunar sample storage device is slightly higher than the atmospheric pressure, and when the lunar sample in the storage device is operated, it will interfere with the pressure in the storage device, therefore, an automatic pressure balancing system needs to be designed to maintain the stability of the micro-positive pressure environment in the storage device. SUMMARY

[0003] The purpose of the present disclosure is to solve the technical problems in the related art, and provide a gas pressure regulating system of a lunar sample storage device. The specific scheme is as follows:

[0004] The embodiment of the present application provides a kind of lunar sample storage device air pressure regulating system, comprising: moon sample storage unit, is configured to store lunar sample and maintain micro-positive pressure environment to isolate atmospheric pollutants;Pressure regulating unit is connected with the moon sample storage unit, is configured to adjust the pressure in the moon sample storage unit to make the micro-positive pressure environment in the moon sample storage unit stable, the pressure regulating unit includes: the negative pressure buffer tank configured to receive the gas discharged when the pressure in the moon sample storage tank is too high, and the positive pressure air supply tank configured to supplement gas when the pressure in the moon sample storage tank is too low;Gas supply unit is connected with the pressure regulating unit, is configured to provide high-purity nitrogen;Pressure monitoring unit includes: the first sensor arranged in the moon sample storage tank, the second sensor arranged in the negative pressure buffer tank and the third sensor arranged in the positive pressure air supply tank, the first sensor, the second sensor, the third sensor are configured to monitor the pressure in the moon sample storage unit and the pressure regulating unit;Control unit is electrically connected with the pressure regulating unit, gas supply unit and pressure monitoring unit respectively, is configured to control the operation of each unit according to pressure monitoring data, wherein high-purity nitrogen is introduced into the moon sample storage tank by the gas supply unit, to form an initial micro-positive pressure environment of +5~+20mbar in the moon sample storage tank, the first sensor monitors the pressure value in the moon sample storage tank according to the first preset time length;When the pressure value in the moon sample storage unit is stable in the range of +5~+20mbar, stop introducing high-purity nitrogen into the moon sample storage tank;The control unit monitors the pressure in the moon sample storage tank in real time by the first sensor, monitors the pressure in the negative pressure buffer tank by the second sensor, and monitors the pressure in the positive pressure air supply tank by the third sensor;When the pressure in the moon sample storage tank is higher than +20mbar, the control unit controls the pressure regulating unit, so that the gas in the moon sample storage tank flows to the negative pressure buffer tank until the pressure in the moon sample storage tank is reduced to less than +15mbar;When the pressure in the moon sample storage tank is less than +5mbar, the control unit controls the pressure regulating unit, so that the gas in the positive pressure air supply tank flows to the moon sample storage tank until the pressure in the moon sample storage tank rises to more than +10mbar;The pressure in the moon sample storage tank, the negative pressure buffer tank and the positive pressure air supply tank is continuously monitored by the control unit, and the pressure regulating unit is dynamically adjusted to maintain the micro-positive pressure in the moon sample storage tank stable at +5~+20mbar;The first preset time length is the time length required for monitoring the pressure of the moon sample storage tank from the initial state to +5~+20mbar stable, and the first preset time length is greater than the response time length of the control unit for adjusting pressure at a time.

[0005] In some embodiments, the pressure regulating unit comprises: a first valve body, which is an electromagnetic valve, arranged between the negative pressure buffer tank and the monthly sample storage tank, configured to control the working state of the negative pressure buffer tank according to the signal of the control unit; a gas extraction pump connected with the negative pressure buffer tank, configured to extract the gas in the negative pressure buffer tank to maintain its negative pressure state; a second valve body connecting the gas extraction pump and the negative pressure buffer tank, configured to control the working state of the gas extraction pump according to the signal of the control unit; wherein when the pressure in the monthly sample storage tank is higher than +20mbar, the control unit controls the first valve body to open, so that the gas in the monthly sample storage tank flows to the negative pressure buffer tank, until the pressure in the monthly sample storage tank is lower than +15mbar, the control unit controls the first valve body to close; the pressure of the negative pressure buffer tank is maintained by the cooperation of the gas extraction pump and the second valve body.

[0006] In some embodiments, the pressure regulating unit comprises: a third valve body connecting the positive pressure air supply tank and the monthly sample storage tank, configured to control the working state of the positive pressure air supply tank according to the signal of the control unit, wherein when the pressure in the monthly sample storage tank is lower than +5mbar, the control unit controls the third valve body to open, so that the gas in the positive pressure air supply tank flows to the monthly sample storage tank, until the pressure in the monthly sample storage tank is higher than +10mbar, the control unit controls the third valve body to close.

[0007] In some embodiments, the gas supply unit comprises: a high-purity nitrogen cylinder configured to store high-purity nitrogen;

[0008] A fourth valve body connecting the high-purity nitrogen cylinder and the positive pressure air supply tank, configured to control the supply of high-purity nitrogen according to the signal of the control unit, wherein the pressure of the positive pressure air supply tank is maintained by the cooperation of the high-purity nitrogen cylinder and the fourth valve body.

[0009] In some embodiments, the control unit comprises a pressure regulating controller electrically connected to the first sensor, the second sensor, the third sensor, the first valve, the second valve, the third valve, the fourth valve and the air pump, respectively, and configured to regulate the working states of the first valve, the second valve, the third valve, the fourth valve and the air pump according to the monitoring data of the pressure monitoring unit. The continuous monitoring of the pressures in the moon sample storage tank, the negative pressure buffer tank and the positive pressure air supplement tank by the control unit comprises: when the pressure difference between the moon sample storage tank and the negative pressure buffer tank is less than 120 mbar, the pressure regulating controller starts the air pump and opens the second valve until the pressure in the negative pressure buffer tank is 100-200 mbar lower than the pressure in the moon sample storage tank, and then closes the air pump and the second valve; when the pressure difference between the positive pressure air supplement tank and the moon sample storage tank is greater than 120 mbar, the pressure regulating controller opens the fourth valve to make the high-purity nitrogen cylinder deliver high-purity nitrogen to the positive pressure air supplement tank until the pressure in the positive pressure air supplement tank is 100-200 mbar higher than the pressure in the moon sample storage tank, and then closes the fourth valve.

[0010] In some embodiments, the pressure regulating controller has a first negative pressure regulating mode and a second negative pressure regulating mode for regulating the pressure of the negative pressure buffer tank. When the pressure difference between the initial pressure of the negative pressure buffer tank and the moon sample storage tank is less than 100 mbar, the first negative pressure regulating mode is adopted; when the pressure difference between the initial pressure of the negative pressure buffer tank and the moon sample storage tank is 100-120 mbar, the second negative pressure regulating mode is adopted.

[0011] In some embodiments, the first negative pressure regulating mode is triggered when the second sensor monitors that the pressure difference between the negative pressure buffer tank and the moon sample storage tank is less than 100 mbar and the duration exceeds the first preset stable duration; and the second negative pressure regulating mode is triggered when the second sensor monitors that the pressure difference between the negative pressure buffer tank and the moon sample storage tank is 100-120 mbar and the duration exceeds the first preset stable duration.

[0012] In some embodiments, the pressure regulating controller has a first positive pressure regulating mode and a second positive pressure regulating mode for regulating the pressure of the positive pressure air supplement tank. When the pressure difference between the initial pressure of the positive pressure air supplement tank and the moon sample storage tank is greater than 200 mbar, the first positive pressure regulating mode is adopted; when the pressure difference between the initial pressure of the positive pressure air supplement tank and the moon sample storage tank is 120-200 mbar, the second positive pressure regulating mode is adopted.

[0013] In some embodiments, when the third sensor monitors that the pressure difference between the positive pressure compensation tank and the lunar sample storage tank is greater than 200 mbar and the duration exceeds the first preset stable time length, the first positive pressure adjustment mode is triggered; when the third sensor monitors that the pressure difference between the positive pressure compensation tank and the lunar sample storage tank is 120-200 mbar and the duration exceeds the first preset stable time length, the second positive pressure adjustment mode is triggered.

[0014] In some embodiments, the lunar sample storage unit comprises a lunar sample storage tank, which is a sealed structure with a micro-positive pressure environment of +5-+20 mbar inside, and the front panel of the lunar sample storage tank is provided with at least two operation ports, each of which is installed with a fluororubber glove for operating the lunar sample in the tank without breaking the sealed environment.

[0015] Compared with the related art, the above scheme of the embodiments of the present disclosure has at least the following beneficial effects:

[0016] The gas pressure adjustment system of the lunar sample storage device provided by the present disclosure can realize active pressure regulation and control of multiple units in cooperation, accurately maintain the micro-positive pressure environment inside the lunar sample storage unit, and solve the problems of fragmented functions, low regulation accuracy and poor reliability in the prior art. In addition, the gas pressure adjustment system of the lunar sample storage device is realized through the cooperative action of multiple independent units, so that the overall system is more convenient to overhaul and maintain, and the long-term operation stability is ensured.

[0017] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0018] The drawings incorporated into the specification and forming part of the specification, show embodiments consistent with the present disclosure, and together with the specification, are configured to explain the principles of the present disclosure. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative labor. In the drawings:

[0019] Figure 1 is a structural schematic diagram of a gas pressure adjustment system of a lunar sample storage device according to an exemplary embodiment.

[0020] Reference signs:

[0021] lunar sample storage tank 100, operation port 101,

[0022] negative pressure buffer tank 210, first valve body 211, air extraction pump 220, second valve body 221, positive pressure compensation tank 230, third valve body 231, high-purity nitrogen cylinder 240, fourth valve body 241;

[0023] the pressure monitoring unit 300, the first sensor 310, the second sensor 320, and the third sensor 330;

[0024] the pressure regulating controller 400, and the gas pressure adjustment system 1000 of the moon sample storage device. DETAILED DESCRIPTION

[0025] In order to make the purposes, technical solutions and advantages of the present disclosure clearer, the present disclosure will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present disclosure.

[0026] The terms used in the embodiments of the present disclosure are merely for the purpose of describing particular embodiments and are not intended to limit the present disclosure. The singular forms "a", "an" and "the" used in the embodiments of the present disclosure and the appended claims are intended to include plural forms, unless the context clearly indicates otherwise. "Plural" generally includes at least two, and other quantifiers are similar.

[0027] It should be understood that although the terms first, second, third, etc. can be used in the embodiments of the present disclosure to describe, these descriptions should not be limited to these terms. These terms are only used to distinguish the described objects. For example, without departing from the scope of the embodiments of the present disclosure, the first can also be referred to as the second, and similarly, the second can also be referred to as the first. In addition, the terms "first", "second", "third" and the like are only configured for description purposes, and cannot be understood as indicating or implying relative importance.

[0028] It should be understood that the term "and / or" used herein is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents that the front and rear associated objects are in an "or" relationship. The singular forms "a", "said" and "the" are also intended to include plural forms, unless the context clearly indicates otherwise.

[0029] It should be further understood that the terms "center", "longitudinal", "lateral", "front", "back", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are used only for the purpose of facilitating the description of the embodiments and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0030] In the description of the present disclosure, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0031] Depending on the context, the word "if" as used herein can be interpreted to mean "when" or "while" or "in response to the determination" or "in response to the detection". Similarly, the phrase "if determined" or "if detecting (a stated condition or event)" can be interpreted to mean "when determined" or "in response to the determination" or "when detecting (a stated condition or event)" or "in response to the detection (a stated condition or event)".

[0032] It should also be noted that the terms "comprise", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the goods or devices comprising a series of elements not only include those elements, but also include other elements not explicitly listed, or include elements inherent to such goods or devices. Without more limitations, the element defined by the sentence "comprises a" does not exclude the existence of other identical elements in the goods or devices comprising the element.

[0033] China's lunar exploration project has successfully collected drill samples, shovel samples from the lunar surface and returned to Earth. If these lunar samples are exposed to the humid air on Earth, they will react with water and oxygen, and the iron element in the sample will react with oxygen in the air and rust, and the minerals and glass in the sample will react with water in the air to form clay. High-purity nitrogen isolation protection is usually used to prevent lunar samples from being contaminated by particulate matter, water and oxygen in the air.

[0034] The nitrogen pressure in the lunar sample storage device is slightly higher than the atmospheric pressure, and the device is in a micro-positive pressure environment. However, when operating the lunar sample in the storage device through the operation glove, the pressure in the storage device will be disturbed, sometimes increasing and sometimes decreasing. Therefore, an automatic pressure balancing system needs to be designed to maintain the stability of the micro-positive pressure environment in the storage device.

[0035] To solve the above problems, the prior art usually uses a "high-purity nitrogen isolation" method to store lunar samples, that is, high-purity nitrogen is filled into the lunar sample storage device to form a micro-positive pressure environment. However, in actual operation, the operator needs to handle the internal sample through the glove on the storage device, which will disturb the pressure in the storage device. The pressure may rise when the glove is squeezed, and the pressure may decrease when the glove is reset. If the pressure fluctuates beyond the safe range, the sealing structure of the device may be damaged, and the protection of the lunar sample may be lost.

[0036] In related technologies, the air pressure regulation scheme usually uses a "single air supplement valve or exhaust valve" to directly regulate the pressure of the storage device, which has the following defects: first, there is a lack of buffer structure, and direct air exhaust or air supplement may easily cause pressure to change suddenly, which cannot maintain a stable micro-positive pressure; second, there is no independent pressure monitoring and feedback mechanism, the regulation accuracy is low, and it is difficult to cope with the instantaneous pressure disturbance in the operation process; third, the coordination between gas supply and pressure regulation is poor, and the high-purity nitrogen environment cannot be maintained stably for a long time. Therefore, there is an urgent need for an air pressure regulation system and method with perfect structure, accurate regulation, and long-term stable operation to ensure the safety of lunar sample storage.

[0037] To solve the above technical problems, the gas pressure adjusting system of the moon sample storage device comprises: a moon sample storage unit configured to store moon samples and maintain a micro-positive pressure environment to isolate atmospheric pollutants; a pressure adjusting unit connected with the moon sample storage unit and configured to adjust the pressure in the moon sample storage unit to stabilize the micro-positive pressure environment in the moon sample storage unit, the pressure adjusting unit comprising: a negative pressure buffer tank configured to receive gas discharged when the pressure in the moon sample storage tank is too high, and a positive pressure gas supplement tank configured to supplement gas when the pressure in the moon sample storage tank is too low; a gas supply unit connected with the pressure adjusting unit and configured to provide high-purity nitrogen; a pressure monitoring unit comprising: a first sensor arranged in the moon sample storage tank, a second sensor arranged in the negative pressure buffer tank, and a third sensor arranged in the positive pressure gas supplement tank, the first sensor, the second sensor, and the third sensor being configured to monitor the pressure in the moon sample storage unit and the pressure adjusting unit; a control unit electrically connected with the pressure adjusting unit, the gas supply unit, and the pressure monitoring unit, and configured to control the operation of each unit according to the pressure monitoring data, wherein high-purity nitrogen is introduced into the moon sample storage tank through the gas supply unit to form an initial micro-positive pressure environment of +5~+20mbar in the moon sample storage tank, and the first sensor monitors the pressure value in the moon sample storage tank for a first preset time period; when the pressure value in the moon sample storage unit stabilizes in the range of +5~+20mbar, the introduction of high-purity nitrogen into the moon sample storage tank is stopped; the control unit monitors the pressure in the moon sample storage tank in real time through the first sensor, monitors the pressure in the negative pressure buffer tank through the second sensor, and monitors the pressure in the positive pressure gas supplement tank through the third sensor; when the pressure in the moon sample storage tank is higher than +20mbar, the control unit controls the pressure adjusting unit to make the gas in the moon sample storage tank flow to the negative pressure buffer tank until the pressure in the moon sample storage tank drops below +15mbar; when the pressure in the moon sample storage tank is lower than +5mbar, the control unit controls the pressure adjusting unit to make the gas in the positive pressure gas supplement tank flow to the moon sample storage tank until the pressure in the moon sample storage tank rises above +10mbar; the pressure in the moon sample storage tank, the negative pressure buffer tank, and the positive pressure gas supplement tank is continuously monitored by the control unit to dynamically adjust the pressure adjusting unit to maintain the micro-positive pressure in the moon sample storage tank stable at +5~+20mbar; the first preset time period is the time period required for monitoring the pressure in the moon sample storage tank to stabilize at +5~+20mbar from the initial state, and the first preset time period is greater than the response time of the control unit for adjusting the pressure at a time.

[0038] The gas pressure adjusting system of the lunar sample storage device provided by the present disclosure can realize active pressure regulation of multiple units in cooperation, accurately maintain the micro-positive pressure environment inside the lunar sample storage unit, and solve the problems of fragmented functions, low regulation accuracy and poor reliability in the prior art. In addition, since the gas pressure adjusting system of the lunar sample storage device is realized through the cooperation of multiple independent units, the overall system is more convenient to overhaul and maintain, thereby ensuring long-term stable operation.

[0039] The optional embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.

[0040] The first aspect of the embodiments of the present disclosure provides a gas pressure adjusting system 1000 of a lunar sample storage device, which comprises a lunar sample storage unit, a pressure regulating unit, a gas supply unit, a pressure monitoring unit 300 and a control unit. The control unit is electrically connected with the pressure regulating unit, the gas supply unit and the pressure monitoring unit 300 respectively, and is configured to control the operation of each unit according to the pressure monitoring data.

[0041] In some embodiments, the lunar sample storage unit can be the lunar sample storage box 100. The lunar sample storage box 100 is a cubic sealed structure made of a material suitable for storing lunar samples. The inside of the box can be filled with high-purity nitrogen to build a pollution-free environment, and the micro-positive pressure state of +5~+20mbar needs to be maintained. The micro-positive pressure can effectively isolate particulate matter, water and oxygen in the earth's atmosphere, and prevent the samples from being contaminated.

[0042] It should be noted that in the micro-positive pressure state of +5~+20mbar, the data with a positive pressure symbol is used to distinguish from the absolute pressure.

[0043] In some embodiments, at least two operation openings 101 are provided on one side panel of the lunar sample storage box 100, and a fluororubber glove is installed at each operation opening 101. This facilitates the operator to sample and observe the lunar samples in the box without damaging the sealed environment in the box. In addition, the sealing property of the fluororubber glove can further ensure the stability of the micro-positive pressure environment in the box, prevent external pollutants from entering through the gaps of the operation openings 101, and double-protect the lunar sample storage environment from pollution risks caused by operation, in combination with the isolation effect of the micro-positive pressure.

[0044] In some embodiments, the pressure regulating unit comprises a negative pressure buffer tank 210 and a first valve body 211. The negative pressure buffer tank 210 is configured to receive the gas discharged when the pressure in the lunar sample storage box 100 is too high. The negative pressure buffer tank 210 is a sealed tank with a specific volume, and the volume needs to be adapted to the exhaust demand of the lunar sample storage box 100. The main function is to receive the gas discharged from the lunar sample storage box 100 when the pressure in the lunar sample storage box 100 is too high, so as to avoid sudden changes in the pressure in the lunar sample storage box 100 caused by direct gas extraction.

[0045] The first valve body 211 is arranged between the negative pressure buffer tank 210 and the lunar sample storage tank 100, and is configured to control the working state of the negative pressure buffer tank 210. Specifically, the negative pressure buffer tank 210 is connected to the lunar sample storage tank 100 through the first valve body 211, and the first valve body 211 can control the gas flow state from the lunar sample storage tank 100 to the negative pressure buffer tank 210.

[0046] In some embodiments, the pressure regulating unit includes a gas suction pump 220 and a second valve body 221. The gas suction pump 220 has a specific gas suction rate and a limit vacuum degree, and can efficiently extract the gas in the negative pressure buffer tank 210 for maintaining the negative pressure state of the negative pressure buffer tank 210. The second valve body 221 is arranged between the gas suction pump 220 and the negative pressure buffer tank 210, and is configured to control the working state of the gas suction pump 220. That is, the gas suction pump 220 is connected to the negative pressure buffer tank 210 through the second valve body 221, and the second valve body 221 can control the on-off state of the gas path between the gas suction pump 220 and the negative pressure buffer tank 210. Further, the negative pressure buffer tank 210 is also connected to the gas suction pump 220 through the second valve body 221, and the gas suction pump 220 can extract the gas in the negative pressure buffer tank 210 to maintain its negative pressure state.

[0047] When the pressure in the lunar sample storage tank 100 is greater than +20 mbar, the first valve body 211 is opened, and because the pressure in the negative pressure buffer tank 210 is lower than that in the lunar sample storage tank 100, the gas in the tank can flow smoothly into the negative pressure buffer tank 210 until the pressure in the lunar sample storage tank 100 is less than +15 mbar, effectively avoiding pressure drop damage to the sample or causing external air infiltration; when the pressure difference between the negative pressure buffer tank 210 and the lunar sample storage tank 100 is less than 120 mbar, the second valve body 221 is opened and the gas suction pump 220 is started, and the pressure in the negative pressure buffer tank 210 is extracted to be 100-200 mbar lower than that in the lunar sample storage tank 100, ensuring that the negative pressure buffer tank 210 always has stable negative pressure capability, providing reliable support for subsequent exhaust regulation of the lunar sample storage tank 100, and improving the stability and precision of system pressure regulation.

[0048] The arrangement of the gas suction pump 220 ensures that the negative pressure buffer tank 210 can continuously maintain stable negative pressure, providing reliable support for exhaust regulation when the pressure of the lunar sample storage tank 100 is too high, avoiding poor exhaust or delayed pressure regulation due to insufficient negative pressure, ensuring the normal implementation of the system pressure balance function, and indirectly protecting the lunar sample storage environment.

[0049] In some embodiments, the pressure regulating unit comprises a positive pressure compensation tank 230 and a third valve body 231. The positive pressure compensation tank 230 is a compensation component, which is also a sealed tank in structure and can store high-purity nitrogen gas inside, and is used to supplement gas into the moon sample storage tank 100 to maintain a micro-positive pressure environment when the pressure in the moon sample storage tank 100 is too low.

[0050] The third valve body 231 is arranged between the positive pressure compensation tank 230 and the moon sample storage tank 100, and is configured to control the working state of the positive pressure compensation tank 230. Specifically, the positive pressure compensation tank 230 is connected to the moon sample storage tank 100 through the third valve body 231, and the third valve body 231 can control the opening and closing of the compensation channel to control the delivery of gas from the positive pressure compensation tank 230 into the moon sample storage tank 100. When the pressure in the moon sample storage tank 100 is less than +5 mbar, the third valve body 231 is opened because the pressure in the positive pressure compensation tank 230 is higher than that in the moon sample storage tank 100.

[0051] In some embodiments, the gas supply unit comprises a high-purity nitrogen gas cylinder 240 and a fourth valve body 241. The high-purity nitrogen gas cylinder 240 is a gas supply source, which adopts a high-pressure storage design and stores high-purity nitrogen gas inside, and has very low water content and oxygen content, so as to avoid introducing impurities into the moon sample when supplementing gas into the system. The fourth valve body 241 connects the high-purity nitrogen gas cylinder 240 and the positive pressure compensation tank 230, and is configured to control the opening and closing of the supply channel of the high-purity nitrogen gas, i.e., the high-purity nitrogen gas cylinder 240 is connected to the positive pressure compensation tank 230 through the fourth valve body 241, and is used to supplement high-purity nitrogen gas into the positive pressure compensation tank 230.

[0052] Specifically, when the pressure in the moon sample storage tank 100 is less than +5 mbar, the third valve body 231 is opened because the pressure in the positive pressure compensation tank 230 is higher than that in the moon sample storage tank 100, and the high-purity nitrogen gas in the tank can flow smoothly into the moon sample storage tank 100 until the pressure rises to more than +10 mbar, so as to avoid a sudden pressure rise caused by direct gas compensation from damaging the sample or the gas flow field in the tank.

[0053] When the pressure difference between the positive pressure compensation tank 230 and the moon sample storage tank 100 is greater than 120 mbar, the fourth valve body 241 is opened, and the high-purity nitrogen gas cylinder 240 delivers gas to the positive pressure compensation tank 230, so that the pressure in the positive pressure compensation tank 230 is maintained at a range of 100-200 mbar higher than that in the moon sample storage tank 100, which ensures that the positive pressure compensation tank 230 always has sufficient and stable high-purity nitrogen gas for compensation, and ensures the continuous stability of the micro-positive pressure environment of the moon sample storage tank 100, and further improves the response capability of the system to pressure fluctuations.

[0054] In some embodiments, a pressure reducing valve can be provided at the outlet of the high-purity nitrogen cylinder 240, which can stabilize the output pressure of the high-purity nitrogen cylinder 240 within the range of the positive pressure gas supplement tank 230. When the third sensor 330 detects that the pressure difference between the positive pressure gas supplement tank 230 and the moon sample storage tank 100 is greater than 120 mbar, the control unit opens the fourth valve body 241, and the nitrogen in the high-purity nitrogen cylinder 240 flows into the positive pressure gas supplement tank 230 through the pressure reducing valve until the pressure difference reaches the range of 100-200 mbar, and then the fourth valve body 241 is closed. The high-purity nitrogen cylinder 240 provides a clean and stable gas source for the system, ensuring that the positive pressure gas supplement tank 230 can continuously supplement the moon sample storage tank 100 with qualified high-purity nitrogen, maintaining a micro-positive pressure and clean environment in the moon sample storage tank 100, and avoiding sample contamination or pressure imbalance caused by gas impurities or insufficient supply.

[0055] In some embodiments, the pressure monitoring unit 300 includes a first sensor 310, a second sensor 320, and a third sensor 330, all of which have high-precision pressure monitoring capabilities and meet the micro-positive pressure regulation requirements in terms of measurement accuracy, and can collect pressure data of the corresponding tank in real time.

[0056] The first sensor 310 is arranged inside the moon sample storage tank 100 and away from the operation port 101 to avoid airflow interference, ensuring that the monitored pressure data of the moon sample storage tank 100 is accurate, and is configured to monitor the pressure in the moon sample storage tank 100. The second sensor 320 is installed inside the negative pressure buffer tank 210 and is configured to monitor the pressure in the negative pressure buffer tank 210. The third sensor 330 is arranged inside the positive pressure gas supplement tank 230 and is configured to monitor the pressure in the positive pressure gas supplement tank 230.

[0057] In some embodiments, the control unit includes a pressure regulating controller 400, which is electrically connected to the first sensor 310, the second sensor 320, the third sensor 330, the first valve body 211, the second valve body 221, the third valve body 231, the fourth valve body 241, and the air pump 220, respectively. The pressure regulating controller 400 is configured to regulate the working state of the first valve body 211, the second valve body 221, the third valve body 231, the fourth valve body 241, and the air pump 220 according to the monitored pressure of the pressure monitoring unit 300.

[0058] In some embodiments, the control unit includes a pressure regulating controller 400, which is a core control component and has data acquisition, logical judgment, and execution control functions. It can receive monitoring data from the pressure monitoring unit 300 and control the start and stop of the related valves and the air pump 220 according to the preset pressure threshold.

[0059] The pressure regulating controller 400 is electrically connected with the first sensor 310, the second sensor 320, the third sensor 330 respectively to obtain the pressure data of each tank in real time. Specifically, the pressure monitoring unit 300 is electrically connected with the pressure regulating controller 400 to transmit the monitored pressure data to the pressure regulating controller 400 in real time. Accurate pressure data is the basis for logical judgment and precise control of the pressure regulating controller 400. Through the monitoring of these sensors, the pressure regulating controller 400 can timely grasp the pressure state of each tank, avoid adjustment errors caused by inaccurate pressure data, and thus ensure the stability of the micro-positive pressure environment of the lunar sample storage tank 100, effectively isolate pollution, and protect the lunar sample.

[0060] In addition, the pressure regulating controller 400 is also electrically connected with the first valve body 211, the second valve body 221, the third valve body 231 and the fourth valve body 241 to send control signals according to the monitored pressure of the pressure monitoring unit 300 to regulate the working state of the first valve body 211, the second valve body 221, the third valve body 231 and the fourth valve body 241.

[0061] In some embodiments, the air extraction pump 220 is electrically connected with the pressure regulating controller 400 to receive the control signal of the pressure regulating controller 400. When the second sensor 320 monitors that the pressure difference between the negative pressure buffer tank 210 and the lunar sample storage tank 100 is <120 mbar, the pressure regulating controller 400 starts the air extraction pump 220 and opens the second valve body 221, and the air extraction pump 220 starts to extract the gas in the negative pressure buffer tank 210 until the pressure difference reaches the range of 100-200 mbar, and then the pressure regulating controller 400 controls the air extraction pump 220 to stop and the second valve body 221 to close.

[0062] The setting of the air extraction pump 220 ensures that the negative pressure buffer tank 210 can continuously maintain stable negative pressure, provides reliable support for exhaust regulation when the pressure of the lunar sample storage tank 100 is too high, avoids poor exhaust or untimely pressure regulation due to insufficient negative pressure, ensures the normal implementation of the system pressure balance function, and indirectly protects the lunar sample storage environment.

[0063] The pressure regulating controller 400 can monitor the pressure of the lunar sample storage tank 100 in real time, timely control the corresponding valve to realize exhaust or air supplement when the pressure is abnormal, and also can monitor the pressure of the negative pressure buffer tank 210 and the positive pressure air supplement tank 230, maintain the stable pressure difference between them and the lunar sample storage tank 100 by controlling the air extraction pump 220 or the fourth valve body 241, so as to realize the full-automatic closed-loop control of the whole system without manual intervention, respond quickly, and accurately control the pressure in the target range, improve the reliability and stability of the system operation, and meet the long-term unattended storage requirements of the lunar sample.

[0064] In some embodiments, the gas pressure regulating system 1000 of the lunar sample storage device, in the operation process, includes: introducing high-purity nitrogen into the lunar sample storage box 100 through the gas supply unit to form an initial environment of 5-20 mbar micro-positive pressure in the lunar sample storage box 100; and the pressure monitoring unit 300 monitors the pressure value in the lunar sample storage box 100 according to a first preset time length.

[0065] When the pressure value stabilizes in the range of 5-20 mbar, the introduction of high-purity nitrogen into the lunar sample storage box 100 is stopped.

[0066] The pressure regulating controller 400 is started to monitor the pressure in the lunar sample storage box 100 in real time through the first sensor 310, and to monitor the pressure in the negative pressure buffer tank 210 through the second sensor 320 and the pressure in the positive pressure gas supplement tank 230 through the third sensor 330.

[0067] When the pressure in the lunar sample storage box 100 is higher than 20 mbar, the pressure regulating controller 400 controls the first valve body 211 to be opened to make the gas in the lunar sample storage box 100 flow to the negative pressure buffer tank 210 until the pressure in the lunar sample storage box 100 is lower than 15 mbar, and then the pressure regulating controller 400 controls the first valve body 211 to be closed; when the pressure in the lunar sample storage box 100 is lower than 5 mbar, the pressure regulating controller 400 controls the third valve body 231 to be opened to make the gas in the positive pressure gas supplement tank 230 flow to the lunar sample storage box 100 until the pressure in the lunar sample storage box 100 is higher than 10 mbar, and then the pressure regulating controller 400 controls the third valve body 231 to be closed.

[0068] The pressure in the lunar sample storage box 100, the negative pressure buffer tank 210 and the positive pressure gas supplement tank 230 is continuously monitored by the pressure regulating controller 400, and the opening and closing of the valves and the start and stop of the gas pump 220 are dynamically adjusted to maintain the micro-positive pressure in the lunar sample storage box 100 to be stable at 5-20 mbar.

[0069] The first preset time length is the time length required for the pressure in the lunar sample storage box 100 to reach 5-20 mbar from the initial state and stabilize, and the first preset time length is greater than the response time length of the pressure regulating controller 400 for adjusting the pressure at one time.

[0070] In some embodiments, the gas pressure regulating system of the lunar sample storage device composed of the above structural components first needs to perform initial environment construction at the first time of aeration: close all valve bodies and ensure that each box is sealed; open the high-purity nitrogen cylinder 240 and the fourth valve body 241, and input high-purity nitrogen into the positive pressure air supplement tank 230 until the pressure is 150 mbar higher than the initial pressure of the lunar sample storage tank 100 after the fourth valve body 241 is closed, wherein the initial pressure is atmospheric pressure; start the air pump 220 and the second valve body 221, and extract the gas in the negative pressure buffer tank 210 until the pressure is 150 mbar lower than the initial pressure of the lunar sample storage tank 100 after the relevant components are closed; then open the third valve body 231, and input high-purity nitrogen into the lunar sample storage tank 100, and monitor through the first sensor 310, when the pressure rises to +10~+15 mbar and the stable time reaches the first preset time length, ensure that the gas is uniformly distributed, then close the third valve body 231, and complete the initial micro-positive pressure environment construction, which lays a foundation for subsequent pressure stable regulation and ensures that the initial environment meets the requirements of pollution prevention and pressure.

[0071] It should be separately pointed out that in the initial environment construction stage, the nitrogen pressure initially delivered by the high-purity nitrogen cylinder 240 to the lunar sample storage tank 100 needs to be higher than +120 mbar, and the application does not specifically limit the first nitrogen pressure, which can be 150 mbar or other data greater than 120 mbar. The data expressed in the embodiment is only exemplary, and the data has no fundamental influence on the system regulation.

[0072] After completing the initial environment construction, enter the real-time pressure regulation stage for the lunar sample storage tank 100: open the pressure regulating controller 400, and set the upper limit of the pressure of the lunar sample storage tank 100 to +20 mbar and the lower limit of the pressure of the lunar sample storage tank 100 to +5 mbar; the first sensor 310 monitors the pressure in real time, when the pressure in the lunar sample storage tank 100 is >+20 mbar, the pressure regulating controller 400 controls the first valve body 211 to open, the gas in the lunar sample storage tank 100 flows into the buffer tank due to the negative pressure of the negative pressure buffer tank 210, until the pressure is <+15 mbar, the first valve body 211 is closed; when the pressure in the lunar sample storage tank 100 is <+5 mbar, the pressure regulating controller 400 controls the third valve body 231 to open, the high-purity nitrogen in the positive pressure air supplement tank 230 flows into the lunar sample storage tank 100, until the pressure is >+10 mbar, the third valve body 231 is closed, the process realizes the pressure fluctuation of the lunar sample storage tank 100 in the target range through automatic control, avoids the pollution risk caused by manual intervention lag, and guarantees the stability of the micro-positive pressure environment.

[0073] In some embodiments, the pressure of the negative pressure buffer tank 210 is maintained by the coordinated control of the air extraction pump 220 and the second valve body 221, and the pressure of the positive pressure air supplement tank 230 is maintained by the coordinated control of the high-purity nitrogen cylinder 240 and the fourth valve body 241.

[0074] The pressure in the moon sample storage tank 100, the negative pressure buffer tank 210 and the positive pressure air supplement tank 230 is continuously monitored by the pressure regulating controller 400, and the opening and closing of the valves and the start and stop of the air extraction pump 220 are dynamically adjusted, including:

[0075] When the pressure difference between the negative pressure buffer tank 210 and the moon sample storage tank 100 is less than 120 mbar, the pressure regulating controller 400 starts the air extraction pump 220 and opens the second valve body 221, until the pressure in the negative pressure buffer tank 210 is 100-200 mbar lower than the pressure in the moon sample storage tank 100, and then the air extraction pump 220 and the second valve body 221 are closed.

[0076] When the pressure difference between the positive pressure air supplement tank 230 and the moon sample storage tank 100 is greater than 120 mbar, the pressure regulating controller 400 opens the fourth valve body 241, so that the high-purity nitrogen cylinder 240 supplies high-purity nitrogen to the positive pressure air supplement tank 230, until the pressure in the positive pressure air supplement tank 230 is 100-200 mbar higher than the pressure in the moon sample storage tank 100, and then the fourth valve body 241 is closed.

[0077] Specifically, the pressure regulation in the negative pressure buffer tank 210 is synchronized with the real-time pressure regulation of the moon sample storage tank 100. For the negative pressure buffer tank 210, the pressure regulating controller 400 monitors the pressure through the second sensor 320 and calculates the pressure difference between the moon sample storage tank 100 and the negative pressure buffer tank 210. When the pressure difference is less than 120 mbar, the air extraction pump 220 is started and the second valve body 221 is opened, and the buffer tank gas is extracted until the pressure difference reaches 100-200 mbar, and then the relevant components are closed. For the positive pressure air supplement tank 230, the pressure is monitored by the third sensor 330, and the pressure difference between the moon sample storage tank 100 and the positive pressure air supplement tank 230 is calculated. When the pressure difference is greater than 120 mbar, the fourth valve body 241 is opened, and the high-purity nitrogen cylinder 240 supplies gas to the air supplement tank until the pressure difference reaches 100-200 mbar, and then the fourth valve body 241 is closed.

[0078] The gas pressure regulating system provided by the present disclosure ensures that the negative pressure buffer tank 210 and the positive pressure air supplement tank 230 always have a stable pressure difference during operation, providing reliable conditions for the exhaust and air supplement of the moon sample storage tank 100, avoiding unstable pressure regulation due to insufficient or excessive pressure difference of the buffer tank, and further improving the regulation accuracy and stability of the system.

[0079] In some embodiments, the pressure adjustment of the negative pressure buffer tank 210 by the pressure regulating controller 400 includes a first negative pressure adjustment mode and a second negative pressure adjustment mode. When the pressure regulating controller 400 adjusts the pressure of the negative pressure buffer tank 210 in the first negative pressure adjustment mode, the air pump 220 operates at a high load, or the second valve 221 is opened to a large extent to obtain a larger flow rate. When the pressure regulating controller 400 adjusts the pressure of the negative pressure buffer tank 210 in the second negative pressure adjustment mode, the air pump 220 operates at a low load, or the second valve 221 is opened to a small extent to obtain a smaller flow rate. Specifically, when the initial pressure difference between the negative pressure buffer tank 210 and the monthly sample storage tank 100 is less than 100 mbar, the first negative pressure adjustment mode is adopted; when the initial pressure difference between the negative pressure buffer tank 210 and the monthly sample storage tank 100 is 100~120 mbar, the second negative pressure adjustment mode is adopted.

[0080] In some embodiments, the pressure adjustment of the positive pressure replenishment tank 230 by the pressure regulating controller 400 includes a first positive pressure adjustment mode and a second positive pressure adjustment mode;

[0081] When the pressure regulating controller 400 regulates the positive pressure replenishment tank 230 in the first positive pressure adjustment mode, the fourth valve body 241 is opened to a small extent to obtain a small flow rate; when the pressure regulating controller 400 regulates the positive pressure replenishment tank 230 in the second positive pressure adjustment mode, the fourth valve body 241 is opened to a large extent to obtain a large flow rate. Specifically, when the pressure difference between the initial pressure of the positive pressure replenishment tank 230 and the monthly sample storage tank 100 is greater than 200 mbar, the first positive pressure adjustment mode is adopted; when the pressure difference between the initial pressure of the positive pressure replenishment tank 230 and the monthly sample storage tank 100 is 120~200 mbar, the second positive pressure adjustment mode is adopted.

[0082] In some embodiments, the triggering conditions for the first negative pressure adjustment mode, the second negative pressure adjustment mode, the first positive pressure adjustment mode, and the second positive pressure adjustment mode include:

[0083] When the second sensor 320 detects that the pressure difference between the negative pressure buffer tank 210 and the monthly sample storage tank 100 is less than 100 mbar and the duration exceeds the first preset stabilization time, the first negative pressure adjustment mode is triggered.

[0084] When the second sensor 320 detects that the pressure difference between the negative pressure buffer tank 210 and the monthly sample storage tank 100 is 100~120mbar and the duration exceeds the first preset stabilization time, the second negative pressure adjustment mode is triggered.

[0085] When the third sensor 330 detects that the pressure difference between the positive pressure replenishment tank 230 and the monthly sample storage tank 100 is greater than 200 mbar and the duration exceeds the first preset stabilization time, the first positive pressure adjustment mode is triggered.

[0086] When the third sensor 330 monitors that the pressure difference between the positive pressure compensation tank 230 and the lunar sample storage tank 100 is 120-200 mbar, and the duration exceeds the first preset stable duration, the second positive pressure adjustment mode is triggered.

[0087] In some embodiments, the pressure regulating controller 400 switches between the first negative pressure adjustment mode and the second negative pressure adjustment mode, comprising:

[0088] According to the first negative pressure adjustment mode, the second negative pressure adjustment mode, the first negative pressure adjustment mode cycle sequence switching; or,

[0089] According to the first negative pressure adjustment mode, the second negative pressure adjustment mode, standby state, the second negative pressure adjustment mode, the first negative pressure adjustment mode cycle sequence switching; or,

[0090] According to the first negative pressure adjustment mode, standby state, the second negative pressure adjustment mode, standby state, the first negative pressure adjustment mode cycle sequence switching.

[0091] In some embodiments, the first negative pressure adjustment mode, the second negative pressure adjustment mode, the first negative pressure adjustment mode cycle sequence switching, comprising:

[0092] When the pressure difference between the negative pressure buffer tank 210 and the lunar sample storage tank 100 is less than 100 mbar and lasts for the first preset stable duration, the first negative pressure adjustment mode is triggered;

[0093] When the second sensor 320 monitors that the pressure difference between the negative pressure buffer tank 210 and the lunar sample storage tank 100 rises to 100-120 mbar and lasts for the first preset stable duration, the second negative pressure adjustment mode is adjusted;

[0094] When the second sensor 320 monitors that the pressure difference between the negative pressure buffer tank 210 and the lunar sample storage tank 100 drops to less than 100 mbar and lasts for the first preset stable duration, the first negative pressure adjustment mode is switched back.

[0095] In some embodiments, the first negative pressure adjustment mode, the second negative pressure adjustment mode, standby state, the second negative pressure adjustment mode, the first negative pressure adjustment mode cycle sequence switching, comprising:

[0096] When the pressure difference between the negative pressure buffer tank 210 and the lunar sample storage tank 100 is less than 100 mbar and lasts for the first preset stable duration, the first negative pressure adjustment mode is triggered;

[0097] When the pressure difference between the negative pressure buffer tank 210 and the lunar sample storage tank 100 rises to 100-120 mbar and lasts for the first preset stable duration, the second negative pressure adjustment mode is switched;

[0098] When the pressure difference between the negative pressure buffer tank 210 and the monthly sample storage tank 100 is stabilized at 100-200 mbar and lasts for a second preset stable duration, the standby state is entered;

[0099] When the pressure difference between the negative pressure buffer tank 210 and the monthly sample storage tank 100 in the standby state drops to 100-120 mbar and lasts for a first preset stable duration, the second negative pressure adjustment mode is switched to;

[0100] When the pressure difference between the negative pressure buffer tank 210 and the monthly sample storage tank 100 in the second negative pressure adjustment mode drops to less than 100 mbar and lasts for a first preset stable duration, the first negative pressure adjustment mode is switched to.

[0101] In some embodiments, the pressure regulating controller 400 switches between the first positive pressure adjustment mode and the second positive pressure adjustment mode, comprising:

[0102] Switches in the order of the first positive pressure adjustment mode, the second positive pressure adjustment mode, the first positive pressure adjustment mode in a cycle; or,

[0103] Switches in the order of the first positive pressure adjustment mode, the second positive pressure adjustment mode, the standby state, the second positive pressure adjustment mode, the first positive pressure adjustment mode in a cycle; or,

[0104] Switches in the order of the first positive pressure adjustment mode, the standby state, the second positive pressure adjustment mode, the standby state, the first positive pressure adjustment mode in a cycle.

[0105] In some embodiments, the pressure regulating controller 400 switches in the order of the first positive pressure adjustment mode, the second positive pressure adjustment mode, the first positive pressure adjustment mode in a cycle, comprising:

[0106] When the pressure difference between the positive pressure air supply tank 230 and the monthly sample storage tank 100 is greater than 200 mbar and lasts for a first preset stable duration, the first positive pressure adjustment mode is triggered;

[0107] When the third sensor 330 monitors that the pressure difference between the positive pressure air supply tank 230 and the monthly sample storage tank 100 drops to 120-200 mbar and lasts for a first preset stable duration, the second positive pressure adjustment mode is adjusted to;

[0108] When the third sensor 330 monitors that the pressure difference between the positive pressure air supply tank 230 and the monthly sample storage tank 100 rises to more than 200 mbar and lasts for a first preset stable duration, the first positive pressure adjustment mode is switched back.

[0109] In some embodiments, the pressure regulating controller 400 switches in the order of the first positive pressure adjustment mode, the second positive pressure adjustment mode, the standby state, the second positive pressure adjustment mode, the first positive pressure adjustment mode in a cycle, comprising:

[0110] When the pressure difference between the positive pressure compensation tank 230 and the lunar sample storage tank 100 is greater than 200 mbar and lasts for a first preset stable time length, the first positive pressure adjustment mode is triggered;

[0111] When the pressure difference between the positive pressure compensation tank 230 and the lunar sample storage tank 100 is reduced to 120-200 mbar and lasts for a first preset stable time length, the second positive pressure adjustment mode is switched to;

[0112] When the pressure difference between the positive pressure compensation tank 230 and the lunar sample storage tank 100 is stable at 100-200 mbar and lasts for a second preset stable time length, the standby state is entered;

[0113] When the pressure difference between the positive pressure compensation tank 230 and the lunar sample storage tank 100 is increased to 120-200 mbar and lasts for a first preset stable time length in the standby state, the second positive pressure adjustment mode is switched to;

[0114] When the pressure difference between the positive pressure compensation tank 230 and the lunar sample storage tank 100 is increased to more than 200 mbar and lasts for a first preset stable time length in the second positive pressure adjustment mode, the first positive pressure adjustment mode is switched to.

[0115] The present disclosure sets up a lunar sample storage tank 100, a negative pressure buffer tank 210, a positive pressure compensation tank 230, a pressure regulating controller 400 and other structural components, and constructs a full-automatic micro-positive pressure automatic balancing system, which has significant advantages compared with related technologies, realizes full-automatic closed-loop regulation of the micro-positive pressure of the lunar sample storage tank 100, has fast response speed, and avoids pollution risks caused by manual intervention lag. When the lunar sample in the lunar sample storage tank 100 is operated by an operating glove, the pressure in the lunar sample storage tank 100 will be disturbed, sometimes the pressure will be increased and sometimes the pressure will be reduced. Through the buffering effect of the negative pressure buffer tank 210 and the positive pressure compensation tank 230, the pressure regulation process is stable, the pressure fluctuation amplitude is small, and the pressure is prevented from changing suddenly to damage the sample and the sealing structure of the lunar sample storage tank 100. The stable pressure difference between the negative pressure buffer tank 210, the positive pressure compensation tank 230 and the lunar sample storage tank 100 can also be maintained, and the pressure regulation precision is improved. In actual application, a monitoring device can also be assembled to realize long-term unattended operation, have abnormal alarm and fault diagnosis functions, meet the long-term storage demand of the lunar sample, and provide a safe and reliable environmental guarantee for the ground storage and subsequent research of the lunar sample.

[0116] The specific structure, working principle and beneficial effects of the gas pressure regulation system of the lunar sample storage device provided in the embodiments of the present disclosure can refer to the gas pressure regulation system of the lunar sample storage device described in any of the above embodiments, which will not be repeated here.

[0117] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the systems or apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple, and relevant parts can be referred to the method section.

[0118] The above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit it. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this disclosure.

Claims

1. A pressure regulation system for a lunar sample storage device, characterized in that, The application relates to a lunar sample storage device, which comprises: a lunar sample storage unit configured to store lunar samples and maintain a micro-positive pressure environment to isolate atmospheric pollutants; a pressure regulating unit connected with the lunar sample storage unit and configured to regulate the pressure in the lunar sample storage unit to stabilize the micro-positive pressure environment in the lunar sample storage unit, the pressure regulating unit comprising a negative pressure buffer tank configured to receive gas discharged when the pressure in the lunar sample storage unit is too high and a positive pressure gas supplement tank configured to supplement gas when the pressure in the lunar sample storage unit is too low; a gas supply unit connected with the pressure regulating unit and configured to provide high-purity nitrogen gas; a pressure monitoring unit comprising a first sensor arranged in the lunar sample storage unit, a second sensor arranged in the negative pressure buffer tank and a third sensor arranged in the positive pressure gas supplement tank, wherein the first sensor, the second sensor and the third sensor are configured to monitor the pressure in the lunar sample storage unit and the pressure regulating unit; a control unit electrically connected with the pressure regulating unit, the gas supply unit and the pressure monitoring unit respectively and configured to control the operation of each unit according to pressure monitoring data, wherein high-purity nitrogen gas is introduced into the lunar sample storage unit through the gas supply unit to form an initial micro-positive pressure environment of +5 to +20 mbar in the lunar sample storage unit, and the first sensor monitors the pressure value in the lunar sample storage unit for a first preset time length; when the pressure value in the lunar sample storage unit is stabilized in the range of +5 to +20 mbar, the introduction of high-purity nitrogen gas into the lunar sample storage unit is stopped; the control unit monitors the pressure in the lunar sample storage unit in real time through the first sensor, monitors the pressure in the negative pressure buffer tank through the second sensor and monitors the pressure in the positive pressure gas supplement tank through the third sensor; when the pressure in the lunar sample storage unit is higher than +20 mbar, the control unit controls the pressure regulating unit to make the gas in the lunar sample storage unit flow to the negative pressure buffer tank until the pressure in the lunar sample storage unit is reduced to be lower than +15 mbar; when the pressure in the lunar sample storage unit is lower than +5 mbar, the control unit controls the pressure regulating unit to make the gas in the positive pressure gas supplement tank flow to the lunar sample storage unit until the pressure in the lunar sample storage unit is increased to be higher than +10 mbar; the pressure in the lunar sample storage unit, the negative pressure buffer tank and the positive pressure gas supplement tank is continuously monitored through the control unit, and the pressure regulating unit is dynamically adjusted to maintain the micro-positive pressure in the lunar sample storage unit to be stabilized in the range of +5 to +20 mbar; the first preset time length is the time length required for monitoring the pressure in the lunar sample storage unit to be stabilized in the range of +5 to +20 mbar from an initial state, and the first preset time length is longer than the response time length of the control unit for adjusting the pressure at a time.

2. The gas pressure regulating system of a lunar sample storage device of claim 1, wherein, The pressure regulating unit comprises: a first valve body, which is an electromagnetic valve arranged between the negative pressure buffer tank and the lunar sample storage unit and configured to control the working state of the negative pressure buffer tank according to the signal of the control unit. a gas extraction pump connected with the negative pressure buffer tank and configured to extract gas in the negative pressure buffer tank to maintain a negative pressure state thereof; a second valve body connected between the gas extraction pump and the negative pressure buffer tank and configured to control an operating state of the gas extraction pump according to a signal of the control unit; wherein, when the pressure in the monthly sample storage unit is higher than +20 mbar, the control unit controls the first valve body to open, so that the gas in the monthly sample storage unit flows to the negative pressure buffer tank until the pressure in the monthly sample storage unit is reduced to be lower than +15 mbar, and the control unit controls the first valve body to close; and the pressure in the negative pressure buffer tank is maintained by the gas extraction pump and the second valve body.

3. The gas pressure regulating system of a lunar sample storage device of claim 2, wherein, The pressure regulating unit further comprises: a third valve body connected between the positive pressure air supplement tank and the monthly sample storage unit and configured to control an operating state of the positive pressure air supplement tank according to a signal of the control unit, wherein, when the pressure in the monthly sample storage unit is lower than +5 mbar, the control unit controls the third valve body to open, so that the gas in the positive pressure air supplement tank flows to the monthly sample storage unit until the pressure in the monthly sample storage unit is increased to be higher than +10 mbar, and the control unit controls the third valve body to close.

4. The gas pressure regulating system of a lunar sample storage device of claim 3, wherein, The gas supply unit comprises: a high-purity nitrogen cylinder configured to store high-purity nitrogen; a fourth valve body connected between the high-purity nitrogen cylinder and the positive pressure air supplement tank and configured to control supply of high-purity nitrogen according to a signal of the control unit, wherein, the pressure in the positive pressure air supplement tank is maintained by the high-purity nitrogen cylinder and the fourth valve body.

5. The gas pressure regulating system of a lunar sample storage device of claim 4, wherein, The control unit comprises: a pressure regulating controller electrically connected with the first sensor, the second sensor, the third sensor, the first valve body, the second valve body, the third valve body, the fourth valve body and the gas extraction pump, and configured to regulate operating states of the first valve body, the second valve body, the third valve body, the fourth valve body and the gas extraction pump according to monitoring data of the pressure monitoring unit, wherein, the pressure in the monthly sample storage unit, the negative pressure buffer tank and the positive pressure air supplement tank is continuously monitored by the control unit, including: when the pressure difference between the monthly sample storage unit and the negative pressure buffer tank is less than 120 mbar, the pressure regulating controller starts the gas extraction pump and opens the second valve body until the pressure in the negative pressure buffer tank is 100-200 mbar lower than the pressure in the monthly sample storage unit, and then the gas extraction pump and the second valve body are closed; when the pressure difference between the positive pressure air supplement tank and the monthly sample storage unit is greater than 120 mbar, the pressure regulating controller opens the fourth valve body to make the high-purity nitrogen cylinder deliver high-purity nitrogen to the positive pressure air supplement tank until the pressure in the positive pressure air supplement tank is 100-200 mbar higher than the pressure in the monthly sample storage unit, and then the fourth valve body is closed.

6. The gas pressure regulating system of the moon sample storage device according to claim 5, wherein the pressure adjustment mode of the negative pressure buffer tank by the pressure regulating controller comprises a first negative pressure adjustment mode and a second negative pressure adjustment mode. When the pressure difference between the initial pressure of the negative pressure buffer tank and the lunar sample storage unit is less than 100 mbar, the first negative pressure adjustment mode is adopted; when the pressure difference between the initial pressure of the negative pressure buffer tank and the lunar sample storage unit is 100-120 mbar, the second negative pressure adjustment mode is adopted.

7. The air pressure adjustment system of the lunar sample storage device according to claim 6, wherein, when the second sensor monitors that the pressure difference between the negative pressure buffer tank and the lunar sample storage unit is less than 100 mbar and the duration exceeds the first preset stable time length, the first negative pressure adjustment mode is triggered; when the second sensor monitors that the pressure difference between the negative pressure buffer tank and the lunar sample storage unit is 100-120 mbar and the duration exceeds the first preset stable time length, the second negative pressure adjustment mode is triggered.

8. The air pressure adjustment system of the lunar sample storage device according to claim 5, wherein, the pressure adjustment of the positive pressure air supply tank by the pressure regulating controller comprises a first positive pressure adjustment mode and a second positive pressure adjustment mode; when the pressure difference between the initial pressure of the positive pressure air supply tank and the lunar sample storage unit is greater than 200 mbar, the first positive pressure adjustment mode is adopted; when the pressure difference between the initial pressure of the positive pressure air supply tank and the lunar sample storage unit is 120-200 mbar, the second positive pressure adjustment mode is adopted.

9. The air pressure adjustment system of the lunar sample storage device according to claim 8, wherein, when the third sensor monitors that the pressure difference between the positive pressure air supply tank and the lunar sample storage unit is greater than 200 mbar and the duration exceeds the first preset stable time length, the first positive pressure adjustment mode is triggered; when the third sensor monitors that the pressure difference between the positive pressure air supply tank and the lunar sample storage unit is 120-200 mbar and the duration exceeds the first preset stable time length, the second positive pressure adjustment mode is triggered.

10. The gas pressure regulating system of a lunar sample storage device of claim 1, wherein, the lunar sample storage unit comprises: the lunar sample storage tank is a sealed structure, and the inside is a micro-positive pressure environment of +5-+20 mbar; the front panel of the lunar sample storage tank is provided with at least two operation ports, and a fluorine rubber glove is installed on each operation port, which is used for operating the lunar sample in the tank without damaging the sealed environment.

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