A method for controlling the lunar sample storage anhydrous oxygen environment

Abstract

The application provides a control method for storing a lunar sample in a water-oxygen-free environment, comprising: introducing nitrogen into a lunar sample storage device to replace air in the storage device, and monitoring water-oxygen content in the storage device for a first preset time length; when the water-oxygen content meets a first threshold value, stopping the introduction of nitrogen into the lunar sample storage device; starting a purification system to make mixed gas in the storage device circulate through the purification system and the storage device, and monitoring the water-oxygen content in the storage device for a second preset time length; when the water-oxygen content meets a second threshold value, the water-oxygen-free environment in the lunar sample storage device is completed, and the lunar sample storage device can be used to store a lunar sample; continuously making the mixed gas circulate through the purification system and the storage device to maintain the water-oxygen content in the storage device meeting the second threshold value; wherein the first preset time length is longer than the second preset time length, and the first threshold value is greater than the second threshold value.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lunar soil storage, in particular to a control method for storing lunar samples in an anhydrous oxygen environment. BACKGROUND

[0002] Before the samples are collected on the moon, they have existed in a vacuum environment for millions to billions of years. If these samples are exposed to the humid air on Earth, they will chemically react with some components in the air, for example, the iron elements in the samples will react with oxygen in the air and rust, and the minerals and glass in the samples will react with water in the air to form clay. Therefore, in the Earth environment, the lunar samples cannot be exposed to the air during storage, processing and transportation. SUMMARY

[0003] The purpose of the present application is to provide a control method for storing lunar samples in an anhydrous oxygen environment, which can solve at least one of the above technical problems. The specific scheme is as follows:

[0004] According to the specific embodiment of the present application, the present application provides a control method for storing lunar samples in an anhydrous oxygen environment, comprising:

[0005] Nitrogen is introduced into the lunar sample storage device to replace the air in the storage device, and the water and oxygen content in the storage device is monitored according to a first preset time length;

[0006] When the water and oxygen content meets a first threshold value, the introduction of nitrogen into the lunar sample storage device is stopped;

[0007] The purification system is started, the mixed gas in the storage device flows through the purification system and the storage device in a circulating manner, and the water and oxygen content in the storage device is monitored according to a second preset time length;

[0008] When the water and oxygen content meets a second threshold value, the anhydrous oxygen environment in the lunar sample storage device is completed, and the lunar sample can be stored in the lunar sample storage device;

[0009] The mixed gas continues to flow through the purification system and the storage device in a circulating manner to maintain the water and oxygen content in the storage device to meet the second threshold value;

[0010] Wherein, the first preset time length is greater than the second preset time length, and the first threshold value is greater than the second threshold value.

[0011] In some embodiments, the purification system comprises a first purification system and a second purification system, the first purification system comprises a first purification adsorption column and a second purification adsorption column, and the second purification system comprises a third purification adsorption column and a fourth purification adsorption column;

[0012] continuously circulating the mixed gas through the purification system and the storage device to maintain the water-oxygen content in the storage device to satisfy a second threshold value, comprising:

[0013] opening the first or second purification adsorption column while opening the third or fourth purification adsorption column to maintain the water-oxygen content in the storage device to satisfy a second threshold value.

[0014] In some embodiments, the opening the first or second purification adsorption column while opening the third or fourth purification adsorption column to maintain the water-oxygen content in the storage device to satisfy a second threshold value, comprising:

[0015] opening the first or second purification adsorption column while opening the third or fourth purification adsorption column to make the first and second purification systems combined into a first working state, a second working state, a third working state and a fourth working state;

[0016] monitoring the water-oxygen content at the output port of the first, second, third or fourth purification adsorption column for a third preset time period, and switching the first and second purification systems among the first working state, the second working state, the third working state and the fourth working state to maintain the water-oxygen content in the storage device to satisfy a second threshold value.

[0017] In some embodiments, the first working state, the second working state, the third working state and the fourth working state, comprising:

[0018] when the water-oxygen content at the output port of the first and third purification adsorption columns is less than or equal to a second threshold value, the first and third purification adsorption columns continue to work, and are recorded as a first working state;

[0019] when the water-oxygen content at the output port of the second and third purification adsorption columns is less than or equal to a second threshold value, the second and third purification adsorption columns continue to work, and are recorded as a second working state;

[0020] when the water-oxygen content at the output port of the first and fourth purification adsorption columns is less than or equal to a second threshold value, the first and fourth purification adsorption columns continue to work, and are recorded as a third working state;

[0021] when the water-oxygen content at the output port of the second and fourth purification adsorption columns is less than or equal to a second threshold value, the second and fourth purification adsorption columns continue to work, and are recorded as a fourth working state.

[0022] In some embodiments, switching the first purification system and the second purification system among the first working state, the second working state, the third working state and the fourth working state comprises:

[0023] switching in a sequence of the first working state, the second working state, the first working state, and the second working state; or

[0024] switching in a sequence of the first working state, the second working state, the fourth working state, the second working state, and the first working state; or

[0025] switching in a sequence of the first working state, the second working state, the fourth working state, the third working state, and the first working state; or

[0026] switching in a sequence of the first working state, the third working state, the first working state, and the second working state; or

[0027] switching in a sequence of the first working state, the third working state, the fourth working state, the second working state, and the first working state; or

[0028] switching in a sequence of the first working state, the third working state, the fourth working state, the third working state, and the first working state.

[0029] In some embodiments, the switching in a sequence of the first working state, the second working state, the first working state comprises:

[0030] when the water-oxygen content of the output port of the first purification adsorption column and the third purification adsorption column is less than or equal to the second threshold value, the first purification adsorption column and the third purification adsorption column continue to work, and work in the first working state;

[0031] when the water-oxygen content of the output port of the first purification adsorption column is greater than the second threshold value, and the water-oxygen content of the output port of the third purification adsorption column is less than or equal to the second threshold value, the first purification adsorption column is closed and the second purification adsorption column is opened, the second purification adsorption column and the third purification adsorption column continue to work, and the purification system is switched from the first working state to the second working state;

[0032] when the water-oxygen content of the output port of the second purification adsorption column is greater than the second threshold value, and the water-oxygen content of the output port of the third purification adsorption column is less than or equal to the second threshold value, the second purification adsorption column is closed and the first purification adsorption column is opened, the first purification adsorption column and the third purification adsorption column continue to work, and the purification system is switched from the second working state to the first working state.

[0033] In some embodiments, the sequentially switching in the cycle of the first working state, the second working state, the fourth working state, the second working state, and the first working state comprises:

[0034] When the water-oxygen content of the output port of the first purification adsorption column and the third purification adsorption column is less than or equal to the second threshold value, the first purification adsorption column and the third purification adsorption column continue to work and work in the first working state;

[0035] When the water-oxygen content of the output port of the first purification adsorption column is greater than the second threshold value and the water-oxygen content of the output port of the third purification adsorption column is less than or equal to the second threshold value, the first purification adsorption column is closed and the second purification adsorption column is opened, the second purification adsorption column and the third purification adsorption column continue to work, and the purification system is switched from the first working state to the second working state;

[0036] When the water-oxygen content of the output port of the third purification adsorption column is greater than the second threshold value and the water-oxygen content of the output port of the second purification adsorption column is less than or equal to the second threshold value, the third purification adsorption column is closed and the fourth purification adsorption column is opened, the second purification adsorption column and the fourth purification adsorption column continue to work, and the purification system is switched from the second working state to the fourth working state;

[0037] When the water-oxygen content of the output port of the fourth purification adsorption column is greater than the second threshold value and the water-oxygen content of the output port of the second purification adsorption column is less than or equal to the second threshold value, the fourth purification adsorption column is closed and the third purification adsorption column is opened, the second purification adsorption column and the third purification adsorption column continue to work, and the purification system is switched from the fourth working state to the second working state;

[0038] When the water-oxygen content of the output port of the second purification adsorption column is greater than the second threshold value and the water-oxygen content of the output port of the third purification adsorption column is less than or equal to the second threshold value, the second purification adsorption column is closed and the first purification adsorption column is opened, the first purification adsorption column and the third purification adsorption column continue to work, and the purification system is switched from the second working state to the first working state.

[0039] In some embodiments, the sequentially switching in the cycle of the first working state, the second working state, the fourth working state, the third working state, and the first working state comprises:

[0040] When the water-oxygen content of the output port of the first purification adsorption column and the third purification adsorption column is less than or equal to the second threshold value, the first purification adsorption column and the third purification adsorption column continue to work and work in the first working state;

[0041] when the water-oxygen content of the output port of the third purification adsorption column is greater than the second threshold value and the water-oxygen content of the output port of the second purification adsorption column is less than or equal to the second threshold value, the third purification adsorption column is closed and the fourth purification adsorption column is opened, the second purification adsorption column and the fourth purification adsorption column continue to work, and the purification system is switched from the second working state to a fourth working state;

[0042] when the water-oxygen content of the output port of the third purification adsorption column is greater than the second threshold value and the water-oxygen content of the output port of the second purification adsorption column is less than or equal to the second threshold value, the third purification adsorption column is closed and the fourth purification adsorption column is opened, the second purification adsorption column and the fourth purification adsorption column continue to work, and the purification system is switched from the second working state to a fourth working state;

[0043] when the water-oxygen content of the output port of the third purification adsorption column is greater than the second threshold value and the water-oxygen content of the output port of the second purification adsorption column is less than or equal to the second threshold value, the third purification adsorption column is closed and the fourth purification adsorption column is opened, the second purification adsorption column and the fourth purification adsorption column continue to work, and the purification system is switched from the second working state to a fourth working state;

[0044] when the water-oxygen content of the output port of the third purification adsorption column is greater than the second threshold value and the water-oxygen content of the output port of the second purification adsorption column is less than or equal to the second threshold value, the third purification adsorption column is closed and the fourth purification adsorption column is opened, the second purification adsorption column and the fourth purification adsorption column continue to work, and the purification system is switched from the second working state to a fourth working state.

[0045] In some embodiments, the switching in the sequence of the first working state, the third working state and the first working state comprises:

[0046] when the water-oxygen content of the output port of the third purification adsorption column is greater than the second threshold value and the water-oxygen content of the output port of the second purification adsorption column is less than or equal to the second threshold value, the third purification adsorption column is closed and the fourth purification adsorption column is opened, the second purification adsorption column and the fourth purification adsorption column continue to work, and the purification system is switched from the second working state to a fourth working state;

[0047] when the water-oxygen content of the output port of the third purification adsorption column is greater than the second threshold value and the water-oxygen content of the output port of the second purification adsorption column is less than or equal to the second threshold value, the third purification adsorption column is closed and the fourth purification adsorption column is opened, the second purification adsorption column and the fourth purification adsorption column continue to work, and the purification system is switched from the second working state to a fourth working state;

[0048] When the water-oxygen content of the fourth purification adsorption column output is greater than the second threshold value, and the water-oxygen content of the first purification adsorption column output is less than or equal to the second threshold value, the fourth purification adsorption column is closed, the third purification adsorption column is opened, and the first purification adsorption column and the third purification adsorption column continue to work, and the purification system is switched from the second working state to the first working state.

[0049] In some embodiments, the first threshold value is 100 ppm, and the second threshold value is 1 ppm.

[0050] Compared with the prior art, the above scheme of the embodiments of the present application has at least the following beneficial effects:

[0051] The present application provides a control method for storing lunar samples in a water-oxygen-free environment, provides a control method for storing lunar samples from an air environment to a water-oxygen-free high-purity nitrogen environment, and clearly defines the operation method for starting the purification system, thereby ensuring the correct start of the lunar sample storage device. In addition, the method provided by the present application can maintain the required storage environment for lunar soil in the storage device for a long time. During the long-term storage of lunar samples, the purification adsorption column is always in an online "waiting" state. When the working purification adsorption column fails or is saturated and regenerated, the "waiting" adsorption column can be used at any time to ensure the normal uninterrupted operation of the system. When the purification adsorption column fails or is regenerated, the water-oxygen content of the storage area cannot fluctuate significantly, achieving "micro-disturbance" switching and ensuring that the water and oxygen indicators of the sample storage device always meet the threshold conditions for storage. BRIEF DESCRIPTION OF DRAWINGS

[0052] Figure 1 A flowchart of the control method for storing lunar samples in a water-oxygen-free environment according to the present embodiment is shown.

[0053] Figure 2 A flowchart of the establishment of a water-oxygen-free high-purity nitrogen environment according to the present embodiment is shown.

[0054] Figure 3 A curve graph of the establishment of a water-oxygen-free environment according to the present embodiment is shown.

[0055] Figure 4 A schematic diagram of the structure of the purification system according to the present embodiment is shown.

[0056] Figure 5 A schematic diagram of the operation logic of the purification system according to the present embodiment is shown. DETAILED DESCRIPTION

[0057] In order to make the purposes, technical solutions and advantages of the present application clearer, the following further describes the present application with reference to the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present application but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of the present application.

[0058] The terms used in the embodiments of the present application are only for the purpose of describing particular embodiments and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. "Plural" generally includes at least two.

[0059] It should be understood that the term "and / or" used herein only describes an association relationship of 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 an "or" relationship between the front and rear associated objects.

[0060] It should be understood that although the terms second, second, third, etc. may be used in the embodiments of the present application to describe structures, these structures should not be limited to these terms. These terms are only used to distinguish different structures. For example, without departing from the scope of the embodiments of the present application, the second component can also be referred to as the second component, and similarly, the second component can also be referred to as the second component.

[0061] It should also be noted that the terms "comprising", "including", or any other variant thereof are intended to cover non-exclusive inclusion, so that a product or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such product or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of additional identical elements in the product or device including the element.

[0062] Relevant studies have shown that high-purity nitrogen can effectively prevent the sample from reacting with the surrounding environment and maintain the purity of the sample. Therefore, storing, processing and transporting lunar scientific samples in a high-purity nitrogen environment is an ideal processing method. In order to ensure that the lunar samples can better maintain their "original" characteristics in the high-purity nitrogen environment, the removal of water and oxygen in high-purity nitrogen is the key point to ensure that the samples are not contaminated, and is also the difficulty in the development of sample storage, processing and transportation equipment.

[0063] Based on this, this application provides a method for controlling an oxygen-free environment for storing lunar samples, comprising: introducing nitrogen gas into a lunar sample storage device to replace the air in the storage device, and monitoring the water and oxygen content in the storage device for a first preset duration; stopping the introduction of nitrogen gas into the lunar sample storage device when the water and oxygen content meets a first threshold; activating a purification system to circulate the mixed gas in the storage device through the purification system and the storage device, and monitoring the water and oxygen content in the storage device for a second preset duration; when the water and oxygen content meets a second threshold, the oxygen-free environment in the lunar sample storage device is completed and can be used to store the lunar sample; continuously circulating the mixed gas through the purification system and the storage device to maintain the water and oxygen content in the storage device meeting the second threshold; wherein, the first preset duration is greater than the second preset duration, and the first threshold is greater than the second threshold.

[0064] This application provides a method for controlling the transition from an atmospheric environment to a high-purity nitrogen environment (anhydrous oxygen) in a lunar sample storage device, and clarifies the operation method for starting the purification system, ensuring the correct startup of the lunar sample storage equipment. The method also provides a method that can maintain the storage environment required for lunar soil within the storage device for extended periods. During long-term storage of lunar samples, a purification adsorption column is always in an online "standby" state. When a working purification adsorption column malfunctions or reaches saturation for regeneration, the "standby" adsorption column can be put into use at any time to ensure the normal and uninterrupted operation of the system.

[0065] The optional embodiments of this application are described in detail below with reference to the accompanying drawings.

[0066] According to the specific implementation of this application, such as Figure 1 This application provides a method for controlling the anhydrous oxygen environment for storing lunar samples, comprising the following steps:

[0067] Step S102: Nitrogen gas is introduced into the lunar sample storage device to replace the air in the storage device, and the water and oxygen content in the storage device is monitored for a first preset time period.

[0068] Step S104: When the water oxygen content meets the first threshold, stop introducing nitrogen into the lunar sample storage device;

[0069] Step S106: Turn on the purification system to allow the mixed gas in the storage device to circulate through the purification system and the storage device, and monitor the water and oxygen content in the storage device for a second preset time period;

[0070] Step S108: When the water and oxygen content meets the second threshold, the water and oxygen-free environment in the lunar sample storage device is completed and can be used to store the lunar sample.

[0071] Step S110: continuously circulating the mixed gas through the purification system and the storage device to maintain the water and oxygen content in the storage device to meet the second threshold; wherein the first preset time period is greater than the second preset time period, and the first threshold is greater than the second threshold.

[0072] As shown in Figure 2 The moon sample storage device is used to store moon soil and the like, and is in communication with an external nitrogen gas supply device. The moon sample storage device is provided with a gas supply valve. The moon sample storage device is initially in an air environment. When the nitrogen environment of the moon sample storage device is initially established, the gas supply valve needs to be opened to introduce high-purity nitrogen (for example, the purity of nitrogen is greater than 99.999%) to displace the air in the sample storage device. The flow rate of the introduced nitrogen is controlled according to the volume of the moon sample storage device, which is not described herein. With the continuous introduction of nitrogen, the water and oxygen content in the storage device is monitored every first preset time period, wherein the first preset time period can be 10-30 minutes, which is not limited. When the water content and oxygen content in the storage device both reach the first threshold, the introduction of nitrogen into the moon sample storage device is stopped; wherein the first threshold can be set according to experiments, for example, 100 ppm, that is, when the water content in the moon sample storage device is less than or equal to 100 ppm and the oxygen content is less than or equal to 100 ppm, the introduction of nitrogen into the moon sample storage device is stopped, otherwise the introduction of nitrogen is continuously performed and monitored.

[0073] When the gas conditions in the sample storage device meet the first threshold, the nitrogen gas supply valve is closed. At this time, the sample storage device still does not have the condition to store the moon sample, and the gas in the sample storage device cannot reach the purity of the original “supplementary gas” and cannot maintain the water and oxygen content of the gas in the main storage area within the required range for a long time. Therefore, the sample storage device needs to be equipped with a purification system, which has the function of further removing water and oxygen, and is connected to the sample storage device through a circulating pipeline. After the gas in the sample storage device is “diluted” to the first threshold, the purification system is started, and the sample storage device and the purification system establish a closed circulation. Through continuous gas circulation, the water and oxygen in the sample storage device are gradually filtered out to meet the requirements of the sample storage device for water and oxygen content and maintain its state for a long time.

[0074] After the purification system is started, the mixed gas in the storage device is circulated through the purification system and the storage device, and the water and oxygen content in the storage device is monitored for a second preset time period; wherein the second preset time period can be 1-3 minutes, when the water and oxygen content meets the second threshold value, the water and oxygen free environment in the lunar sample storage device is completed, and the lunar sample storage device can be used to store the lunar sample; wherein the second threshold value is 1 ppm, that is, when the water content in the lunar sample storage device is less than or equal to 1 ppm and the oxygen content is less than or equal to 1 ppm, the lunar sample storage device can store the lunar sample thereafter, and the purification system can be continuously started to maintain the water and oxygen content in the lunar sample storage device.

[0075] Specifically, according to the above method, the water and oxygen free environment is established for a storage device with a size of 1800mm (length) x 780mm (width) x 900mm (height), the nitrogen gas inlet rate is 100L / min during gas replacement, and the water and oxygen free environment establishment process curve is as shown in Figure 3 During the initial nitrogen replacement process, the water and oxygen content in the storage device decreases approximately linearly until it reaches below 100ppm, then the nitrogen valve is closed and the purification system is started, the water and oxygen content in the storage device decreases approximately curvilinearly until it reaches below 1ppm to meet the storage condition. During the continuous operation of the purification system, the water and oxygen content in the storage device can further decrease to achieve more favorable conditions for storing the lunar sample.

[0076] In some embodiments, as shown in Figure 4 The purification system includes a first purification system and a second purification system, the first purification system includes a first purification adsorption column A1 and a second purification adsorption column A2, and the second purification system includes a third purification adsorption column B1 and a fourth purification adsorption column B2; the purification system removes water and oxygen effectively through built-in purification adsorption columns, the adsorption columns have heating function, and when water and oxygen adsorption is saturated, they can be regenerated online to restore adsorption capacity. Specifically, the first purification adsorption column A1, the second purification adsorption column A2, the third purification adsorption column B1 and the fourth purification adsorption column B2 can be controlled individually, when each adsorption column is saturated with water and oxygen adsorption, the outlet is closed under the control of the control system, and the adsorption capacity is restored after online regeneration, then the outlet is opened under the control of the control system to restore the circulation function.

[0077] In some embodiments, the continuously circulating the mixed gas through the purification system and the storage device to maintain the water-oxygen content in the storage device to satisfy the second threshold value comprises: opening the first purification adsorption column A1 or the second purification adsorption column A2, and simultaneously opening the third purification adsorption column B1 or the fourth purification adsorption column B2 to maintain the water-oxygen content in the storage device to satisfy the second threshold value. That is, the first purification adsorption column A1 and the second purification adsorption column A2 are opened alternately, and the third purification adsorption column B1 and the fourth purification adsorption column B2 are opened alternately to keep the first purification system and the second purification system always having purification adsorption capacity.

[0078] When the purification system is in normal operation, the control system is controlled and monitored in real time to keep it always meeting the conditions for storing lunar samples. When the purification adsorption column fails or is regenerated, the water-oxygen content in the storage area cannot fluctuate obviously, and a "micro-disturbance" switching is required to ensure that the water and oxygen indicators in the sample storage area are always less than or equal to 1 ppm. Therefore, during the long-term storage of lunar samples, there is always a purification adsorption column in an online "waiting" state, which can be put into use at any time when the working purification adsorption column fails or is saturated and regenerated, to ensure the normal uninterrupted operation of the system.

[0079] As a specific embodiment, as shown in Figure 5 The opening of the first purification adsorption column or the second purification adsorption column, and the simultaneous opening of the third purification adsorption column or the fourth purification adsorption column to maintain the water-oxygen content in the storage device to satisfy the second threshold value comprises:

[0080] The opening of the first purification adsorption column or the second purification adsorption column, and the simultaneous opening of the third purification adsorption column or the fourth purification adsorption column make the first purification system and the second purification system combined into a first working state, a second working state, a third working state and a fourth working state.

[0081] The water-oxygen content of the output port of the first purification adsorption column, the second purification adsorption column, the third purification adsorption column or the fourth purification adsorption column is monitored for a third preset time period, and the first purification system and the second purification system are switched between the first working state, the second working state, the third working state and the fourth working state to maintain the water-oxygen content in the storage device to satisfy the second threshold value.

[0082] In this embodiment, the first purification adsorption column A1 or the second purification adsorption column A2 is opened, and the third purification adsorption column B1 or the fourth purification adsorption column B2 is opened at the same time, so that the first purification system and the second purification system are combined into the first working state, the second working state, the third working state and the fourth working state; the water and oxygen content of the output port of the first purification adsorption column A1, the second purification adsorption column A2, the third purification adsorption column B1 or the fourth purification adsorption column B2 is monitored for a third preset time period (for example, 1-2 hours), so that the first purification system and the second purification system are switched between the first working state, the second working state, the third working state and the fourth working state to maintain the water and oxygen content in the storage device to meet the second threshold value.

[0083] Specifically, the first working state, the second working state, the third working state and the fourth working state include:

[0084] When the water and oxygen content of the output port of the first purification adsorption column A1 and the third purification adsorption column B1 is less than or equal to the second threshold value (1 ppm), the first purification adsorption column A1 and the third purification adsorption column B1 continue to work, and are recorded as the first working state;

[0085] When the water and oxygen content of the output port of the second purification adsorption column A2 and the third purification adsorption column B1 is less than or equal to the second threshold value (1 ppm), the second purification adsorption column A2 and the third purification adsorption column B1 continue to work, and are recorded as the second working state;

[0086] When the water and oxygen content of the output port of the first purification adsorption column A1 and the fourth purification adsorption column B2 is less than or equal to the second threshold value (1 ppm), the first purification adsorption column A1 and the fourth purification adsorption column B2 continue to work, and are recorded as the third working state;

[0087] When the water and oxygen content of the output port of the second purification adsorption column A2 and the fourth purification adsorption column B2 is less than or equal to the second threshold value (1 ppm), the second purification adsorption column A2 and the fourth purification adsorption column B2 continue to work, and are recorded as the fourth working state.

[0088] In some embodiments, switching the first purification system and the second purification system between the first working state, the second working state, the third working state and the fourth working state includes:

[0089] Switching according to the first working state, the second working state, the first working state cycle sequence; or,

[0090] Switching according to the first working state, the second working state, the fourth working state, the second working state, the first working state cycle sequence; or,

[0091] sequentially switches according to the first working state, the second working state, the fourth working state, the third working state, the first working state in a cycle; or

[0092] sequentially switches according to the first working state, the second working state, the fourth working state, the third working state, the fourth working state in a cycle; or

[0093] sequentially switches according to the first working state, the third working state, the first working state in a cycle; or

[0094] sequentially switches according to the first working state, the third working state, the fourth working state, the second working state, the first working state in a cycle; or

[0095] sequentially switches according to the first working state, the third working state, the fourth working state, the third working state, the first working state in a cycle, or

[0096] sequentially switches according to the first working state, the third working state, the fourth working state, the third working state, the fourth working state in a cycle.

[0097] In some embodiments, the sequentially switching according to the first working state, the second working state, the first working state in a cycle comprises:

[0098] When the water-oxygen content of the output port of the first purification adsorption column A1 and the third purification adsorption column B1 is less than or equal to the second threshold value, the first purification adsorption column A1 and the third purification adsorption column B1 continue to work according to the first working state;

[0099] When the water-oxygen content of the output port of the first purification adsorption column A1 is greater than the second threshold value, and the water-oxygen content of the output port of the third purification adsorption column B1 is less than or equal to the second threshold value, the first purification adsorption column A1 is closed and the second purification adsorption column A2 is opened, the second purification adsorption column A2 and the third purification adsorption column B1 continue to work, and the purification system switches from the first working state to the second working state;

[0100] When the water-oxygen content of the output port of the second purification adsorption column A2 is greater than the second threshold value, and the water-oxygen content of the output port of the third purification adsorption column B1 is less than or equal to the second threshold value, the second purification adsorption column A2 is closed and the first purification adsorption column A1 is opened, the first purification adsorption column A1 and the third purification adsorption column B1 continue to work, and the purification system switches from the second working state to the first working state.

[0101] In some embodiments, the sequentially switching according to the first working state, the second working state, the fourth working state, the second working state, the first working state in a cycle comprises:

[0102] When the water-oxygen content of the output ports of the first and third purification adsorption columns A1 and B1 is less than or equal to the second threshold value, the first and third purification adsorption columns A1 and B1 continue to work, and work in the first working state;

[0103] When the water-oxygen content of the output port of the first purification adsorption column A1 is greater than the second threshold value, and the water-oxygen content of the output port of the third purification adsorption column B1 is less than or equal to the second threshold value, the first purification adsorption column A1 is closed and the second purification adsorption column A2 is opened, the second and third purification adsorption columns A2 and B1 continue to work, and the purification system is switched from the first working state to the second working state;

[0104] When the water-oxygen content of the output port of the third purification adsorption column B1 is greater than the second threshold value, and the water-oxygen content of the output port of the second purification adsorption column A2 is less than or equal to the second threshold value, the third purification adsorption column B1 is closed and the fourth purification adsorption column B2 is opened, the second and fourth purification adsorption columns A2 and B2 continue to work, and the purification system is switched from the second working state to the fourth working state;

[0105] When the water-oxygen content of the output port of the fourth purification adsorption column B2 is greater than the second threshold value, and the water-oxygen content of the output port of the second purification adsorption column A2 is less than or equal to the second threshold value, the fourth purification adsorption column B2 is closed and the third purification adsorption column B1 is opened, the second and third purification adsorption columns A2 and B1 continue to work, and the purification system is switched from the fourth working state to the second working state;

[0106] When the water-oxygen content of the output port of the second purification adsorption column A2 is greater than the second threshold value, and the water-oxygen content of the output port of the third purification adsorption column B1 is less than or equal to the second threshold value, the second purification adsorption column A2 is closed and the first purification adsorption column A1 is opened, the first and third purification adsorption columns A1 and B1 continue to work, and the purification system is switched from the second working state to the first working state.

[0107] In some embodiments, the working state is switched in the sequence of the first working state, the second working state, the fourth working state, the third working state, and the first working state in a cycle.

[0108] When the water-oxygen content of the output ports of the first and third purification adsorption columns A1 and B1 is less than or equal to the second threshold value, the first and third purification adsorption columns A1 and B1 continue to work, and work in the first working state;

[0109] when the water-oxygen content of the output of the first purification adsorption column A1 is greater than the second threshold value and the water-oxygen content of the output of the third purification adsorption column B1 is less than or equal to the second threshold value, the third purification adsorption column B1 is closed and the fourth purification adsorption column B2 is opened, the second purification adsorption column A2 and the fourth purification adsorption column B2 continue to work, and the purification system is switched from the second working state to a fourth working state;

[0110] when the water-oxygen content of the output of the third purification adsorption column B1 is greater than the second threshold value and the water-oxygen content of the output of the second purification adsorption column A2 is less than or equal to the second threshold value, the third purification adsorption column B1 is closed and the fourth purification adsorption column B2 is opened, the second purification adsorption column A2 and the fourth purification adsorption column B2 continue to work, and the purification system is switched from the second working state to a fourth working state;

[0111] when the water-oxygen content of the output of the second purification adsorption column A2 is greater than the second threshold value and the water-oxygen content of the output of the fourth purification adsorption column B2 is less than or equal to the second threshold value, the second purification adsorption column A2 is closed and the first purification adsorption column A1 is opened, the first purification adsorption column A1 and the fourth purification adsorption column B2 continue to work, and the purification system is switched from the fourth working state to a third working state;

[0112] when the water-oxygen content of the output of the fourth purification adsorption column B2 is greater than the second threshold value and the water-oxygen content of the output of the first purification adsorption column A1 is less than or equal to the second threshold value, the fourth purification adsorption column B2 is closed and the third purification adsorption column B1 is opened, the first purification adsorption column A1 and the third purification adsorption column B1 continue to work, and the purification system is switched from the second working state to the first working state.

[0113] In some embodiments, the sequential switching in the first working state, the third working state, and the first working state includes:

[0114] when the water-oxygen content of the output of the first purification adsorption column A1 and the third purification adsorption column B1 is less than or equal to the second threshold value, the first purification adsorption column A1 and the third purification adsorption column B1 continue to work in the first working state;

[0115] when the water-oxygen content of the output of the third purification adsorption column B1 is greater than the second threshold value and the water-oxygen content of the output of the first purification adsorption column A1 is less than or equal to the second threshold value, the third purification adsorption column B1 is closed and the fourth purification adsorption column B2 is opened, the first purification adsorption column A1 and the fourth purification adsorption column B2 continue to work, and the purification system is switched from the first working state to the third working state;

[0116] When the water-oxygen content of the output of the fourth purification adsorption column B2 is greater than the second threshold value and the water-oxygen content of the output of the first purification adsorption column Al is less than or equal to the second threshold value, the fourth purification adsorption column B2 is closed and the third purification adsorption column Bl is opened, the first purification adsorption column Al and the third purification adsorption column Bl continue to work, and the purification system is switched from the second working state to the first working state.

[0117] In some embodiments, the switching in the sequence of the first working state, the third working state, the fourth working state, and the second working state comprises:

[0118] When the water-oxygen content of the output of the first purification adsorption column Al and the third purification adsorption column Bl is less than or equal to the second threshold value, the first purification adsorption column Al and the third purification adsorption column Bl continue to work in the first working state;

[0119] When the water-oxygen content of the output of the third purification adsorption column Bl is greater than the second threshold value and the water-oxygen content of the output of the first purification adsorption column Al is less than or equal to the second threshold value, the third purification adsorption column Bl is closed and the fourth purification adsorption column B2 is opened, the first purification adsorption column Al and the fourth purification adsorption column B2 continue to work, and the purification system is switched from the first working state to the third working state;

[0120] When the water-oxygen content of the output of the first purification adsorption column Al is greater than the second threshold value and the water-oxygen content of the output of the fourth purification adsorption column B2 is less than or equal to the second threshold value, the first purification adsorption column Al is closed and the second purification adsorption column A2 is opened, the second purification adsorption column A2 and the fourth purification adsorption column B2 continue to work, and the purification system is switched from the third working state to the fourth working state.

[0121] When the water-oxygen content of the output of the fourth purification adsorption column B2 is greater than the second threshold value and the water-oxygen content of the output of the second purification adsorption column A2 is less than or equal to the second threshold value, the fourth purification adsorption column B2 is closed and the third purification adsorption column Bl is opened, the second purification adsorption column A2 and the third purification adsorption column Bl continue to work, and the purification system is switched from the fourth working state to the second working state.

[0122] In some embodiments, the switching in the sequence of the first working state, the third working state, the fourth working state, and the third working state comprises:

[0123] When the water-oxygen content of the output of the first purification adsorption column Al and the third purification adsorption column Bl is less than or equal to the second threshold value, the first purification adsorption column Al and the third purification adsorption column Bl continue to work in the first working state;

[0124] When the water-oxygen content of the third purification adsorption column B1 outlet is greater than the second threshold value, and the water-oxygen content of the first purification adsorption column A1 outlet is less than or equal to the second threshold value, the third purification adsorption column B1 is closed and the fourth purification adsorption column B2 is opened, the first purification adsorption column A1 and the fourth purification adsorption column B2 are continuously worked, and the purification system is switched from the first working state to the third working state.

[0125] When the water-oxygen content of the first purification adsorption column A1 outlet is greater than the second threshold value, and the water-oxygen content of the fourth purification adsorption column B2 outlet is less than or equal to the second threshold value, the first purification adsorption column A1 is closed and the second purification adsorption column A2 is opened, the second purification adsorption column A2 and the fourth purification adsorption column B2 are continuously worked, and the purification system is switched from the third working state to the fourth working state.

[0126] When the water-oxygen content of the second purification adsorption column A2 outlet is greater than the second threshold value, and the water-oxygen content of the fourth purification adsorption column B2 outlet is less than or equal to the second threshold value, the second purification adsorption column A2 is closed and the first purification adsorption column A1 is opened, the first purification adsorption column A1 and the fourth purification adsorption column B2 are continuously worked, and the purification system is switched from the fourth working state to the third working state.

[0127] The application provides a control method for storing lunar samples in a water-oxygen-free environment, and provides a control method for switching a lunar sample storage device from an air environment to a water-oxygen-free high-purity nitrogen environment, and clearly defines the operation method for starting the purification system, thereby ensuring the correct starting of the lunar sample storage device. In addition, the method provided by the application can maintain the required storage environment for lunar soil in the storage device for a long time. During the long-term storage of the lunar sample, the purification adsorption column is always in an online "waiting" state. When the working purification adsorption column fails or is saturated and regenerated, the "waiting" adsorption column can be used at any time to ensure the normal uninterrupted operation of the system. When the purification adsorption column fails or is regenerated, the water-oxygen content of the storage area cannot fluctuate obviously, and the "micro-disturbance" switching is achieved, thereby ensuring that the water and oxygen indexes of the sample storage device always meet the threshold conditions for storage.

[0128] Finally, it should be noted that the embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts of each embodiment can be referred to each other. For the system or device disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and the related parts can be referred to the method part.

[0129] The above examples are only used to illustrate the technical solutions of the present application, but not to limit the same; although the present application has been described in detail with reference to the foregoing examples, it should be understood by those of ordinary skill in the art that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A control method for storing lunar samples in an anhydrous oxygen environment, characterized by, The method comprises the following steps: introducing nitrogen into the lunar sample storage device to replace the air in the storage device and monitoring the water-oxygen content in the storage device for a first preset time period; stopping the introduction of nitrogen into the lunar sample storage device when the water-oxygen content meets a first threshold value; starting the purification system to make the mixed gas in the storage device circulate through the purification system and the storage device and monitoring the water-oxygen content in the storage device for a second preset time period; the purification system comprises a first purification system and a second purification system, the first purification system comprises a first purification adsorption column and a second purification adsorption column, and the second purification system comprises a third purification adsorption column and a fourth purification adsorption column; when the water-oxygen content meets a second threshold value, the water-oxygen-free environment in the lunar sample storage device is completed, and the lunar sample is stored in the storage device; continuously making the mixed gas circulate through the purification system and the storage device to maintain the water-oxygen content in the storage device to meet the second threshold value; the method comprises the following steps: starting the first purification adsorption column or the second purification adsorption column while starting the third purification adsorption column or the fourth purification adsorption column to maintain the water-oxygen content in the storage device to meet the second threshold value; specifically, starting the first purification adsorption column or the second purification adsorption column while starting the third purification adsorption column or the fourth purification adsorption column to make the first purification system and the second purification system combine into a first working state, a second working state, a third working state, and a fourth working state; monitoring the water-oxygen content at the output port of the first purification adsorption column, the second purification adsorption column, the third purification adsorption column, or the fourth purification adsorption column for a third preset time period, and switching the first purification system and the second purification system between the first working state, the second working state, the third working state, and the fourth working state to maintain the water-oxygen content in the storage device to meet the second threshold value; the first working state, the second working state, the third working state, and the fourth working state comprise: when the water-oxygen content at the output port of the first purification adsorption column and the third purification adsorption column is less than or equal to the second threshold value, the first purification adsorption column and the third purification adsorption column continue to work and are recorded as the first working state; when the water-oxygen content at the output port of the second purification adsorption column and the third purification adsorption column is less than or equal to the second threshold value, the second purification adsorption column and the third purification adsorption column continue to work and are recorded as the second working state; when the water-oxygen content at the output port of the first purification adsorption column and the fourth purification adsorption column is less than or equal to the second threshold value, the first purification adsorption column and the fourth purification adsorption column continue to work and are recorded as the third working state; and when the water-oxygen content at the output port of the second purification adsorption column and the fourth purification adsorption column is less than or equal to the second threshold value, the second purification adsorption column and the fourth purification adsorption column continue to work and are recorded as the fourth working state; wherein the first preset time period is longer than the second preset time period, and the first threshold value is greater than the second threshold value.

2. The method of claim 1, wherein, Switching the first purification system and the second purification system among the first working state, the second working state, the third working state and the fourth working state comprises: Switching in a sequence of the first working state, the second working state, the first working state, or Switching in a sequence of the first working state, the second working state, the fourth working state, the second working state, the first working state, or Switching in a sequence of the first working state, the second working state, the fourth working state, the third working state, the first working state, or Switching in a sequence of the first working state, the third working state, the first working state, or Switching in a sequence of the first working state, the third working state, the fourth working state, the second working state, the first working state, or Switching in a sequence of the first working state, the third working state, the fourth working state, the third working state, the first working state.

3. The method of claim 2, wherein, The switching in a sequence of the first working state, the second working state, the first working state comprises: When the water-oxygen content of the output port of the first purification adsorption column and the third purification adsorption column is less than or equal to the second threshold value, the first purification adsorption column and the third purification adsorption column continue to work and work in the first working state; When the water-oxygen content of the output port of the first purification adsorption column is greater than the second threshold value and the water-oxygen content of the output port of the third purification adsorption column is less than or equal to the second threshold value, the first purification adsorption column is closed and the second purification adsorption column is opened, the second purification adsorption column and the third purification adsorption column continue to work, and the purification system is switched from the first working state to the second working state; When the water-oxygen content of the output port of the second purification adsorption column is greater than the second threshold value and the water-oxygen content of the output port of the third purification adsorption column is less than or equal to the second threshold value, the second purification adsorption column is closed and the first purification adsorption column is opened, the first purification adsorption column and the third purification adsorption column continue to work, and the purification system is switched from the second working state to the first working state.

4. The method of claim 2, wherein, The switching in a sequence of the first working state, the second working state, the fourth working state, the second working state, the first working state comprises: When the water-oxygen content of the output port of the first purification adsorption column and the third purification adsorption column is less than or equal to the second threshold value, the first purification adsorption column and the third purification adsorption column continue to work and work in the first working state; When the water-oxygen content of the output port of the first purification adsorption column is greater than the second threshold value and the water-oxygen content of the output port of the third purification adsorption column is less than or equal to the second threshold value, the first purification adsorption column is closed and the second purification adsorption column is opened, the second purification adsorption column and the third purification adsorption column continue to work, and the purification system is switched from the first working state to the second working state; When the water-oxygen content of the output port of the third purification adsorption column is greater than the second threshold value and the water-oxygen content of the output port of the second purification adsorption column is less than or equal to the second threshold value, the third purification adsorption column is closed and the fourth purification adsorption column is opened, the second purification adsorption column and the fourth purification adsorption column continue to work, and the purification system is switched from the second working state to the fourth working state; When the water-oxygen content of the fourth purification adsorption column output is greater than the second threshold value, and the water-oxygen content of the second purification adsorption column output is less than or equal to the second threshold value, the fourth purification adsorption column is closed and the third purification adsorption column is opened, the second purification adsorption column and the third purification adsorption column continue to work, and the purification system is switched from the fourth working state to the second working state; When the water-oxygen content of the second purification adsorption column output is greater than the second threshold value, and the water-oxygen content of the third purification adsorption column output is less than or equal to the second threshold value, the second purification adsorption column is closed and the first purification adsorption column is opened, the first purification adsorption column and the third purification adsorption column continue to work, and the purification system is switched from the second working state to the first working state.

5. The method of claim 2, wherein, The switching in the sequence of the first working state, the second working state, the fourth working state, the third working state, and the first working state comprises: When the water-oxygen content of the output of the first purification adsorption column and the third purification adsorption column is less than or equal to the second threshold value, the first purification adsorption column and the third purification adsorption column continue to work in the first working state; When the water-oxygen content of the first purification adsorption column output is greater than the second threshold value, and the water-oxygen content of the third purification adsorption column output is less than or equal to the second threshold value, the first purification adsorption column is closed and the second purification adsorption column is opened, the second purification adsorption column and the third purification adsorption column continue to work, and the purification system is switched from the first working state to the second working state; When the water-oxygen content of the third purification adsorption column output is greater than the second threshold value, and the water-oxygen content of the second purification adsorption column output is less than or equal to the second threshold value, the third purification adsorption column is closed and the fourth purification adsorption column is opened, the second purification adsorption column and the fourth purification adsorption column continue to work, and the purification system is switched from the second working state to the fourth working state; When the water-oxygen content of the second purification adsorption column output is greater than the second threshold value, and the water-oxygen content of the fourth purification adsorption column output is less than or equal to the second threshold value, the second purification adsorption column is closed and the first purification adsorption column is opened, the first purification adsorption column and the fourth purification adsorption column continue to work, and the purification system is switched from the fourth working state to the third working state; When the water-oxygen content of the fourth purification adsorption column output is greater than the second threshold value, and the water-oxygen content of the first purification adsorption column output is less than or equal to the second threshold value, the fourth purification adsorption column is closed and the third purification adsorption column is opened, the first purification adsorption column and the third purification adsorption column continue to work, and the purification system is switched from the second working state to the first working state.

6. The method of claim 2, wherein, The switching in the sequence of the first working state, the third working state, and the first working state comprises: When the water-oxygen content of the output of the first purification adsorption column and the third purification adsorption column is less than or equal to the second threshold value, the first purification adsorption column and the third purification adsorption column continue to work in the first working state; When the water-oxygen content of the output of the first purification adsorption column and the third purification adsorption column is less than or equal to the second threshold value, the first purification adsorption column and the third purification adsorption column continue to work in the first working state; when the water-oxygen content of the third purification adsorption column output is greater than the second threshold value, and the water-oxygen content of the first purification adsorption column output is less than or equal to the second threshold value, the third purification adsorption column is closed, the fourth purification adsorption column is opened, the first purification adsorption column and the fourth purification adsorption column continue to work, and the purification system is switched from the first working state to the third working state; when the water-oxygen content of the fourth purification adsorption column output is greater than the second threshold value, and the water-oxygen content of the first purification adsorption column output is less than or equal to the second threshold value, the fourth purification adsorption column is closed, the third purification adsorption column is opened, the first purification adsorption column and the third purification adsorption column continue to work, and the purification system is switched from the second working state to the first working state.

7. The method of claim 1, wherein, The first threshold value is 100 ppm, and the second threshold value is 1 ppm.

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