Valve assembly and low-loss purification device for trace Kr gas in lunar soil

Abstract

The invention belongs to the technical field of rare gas analysis equipment, and particularly relates to a valve assembly and a low-loss purification device for trace Kr gas in lunar soil. The valve assembly comprises a mounting base, an upstream communication port, a downstream communication port and a negative pressure communication port are formed around the mounting base and all communicate with a hollow cavity in the mounting base, the negative pressure communication port is connected with a negative pressure chamber, and a rotary switch is further arranged on the mounting base. The rotary switch comprises a plugging part, a first conveying part, a second conveying part, a rotating body and a filling layer. The invention also provides a low-loss purification device for trace Kr gas in lunar soil, which comprises the valve assembly. In the separation and purification process of trace Kr gas in lunar soil, gas loss is reduced, and waste is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of rare gas analysis equipment, and specifically relates to a valve assembly and a low-loss purification device for trace Kr gas in lunar soil. Background Art

[0002] The study of rare gas components in lunar soil has important scientific value in revealing the main gas composition, gas storage and release rules of lunar soil. The research results can provide a theoretical basis for the construction of lunar bases and deep space transfer stations. Kr gas (krypton gas) is a kind of rare gas, which is used in the electronics industry, electric light source industry and gas lasers. Kr gas also exists in lunar soil and has research value.

[0003] On the one hand, the process of obtaining lunar soil samples is costly, difficult, and the quality obtained in one go is also limited. On the other hand, the content of Kr gas in the lunar soil is trace, so the amount of Kr gas sample is relatively scarce and precious, and it is necessary to rely on precision equipment to reduce the loss of Kr gas during the purification process.

[0004] The existing technology has designed some devices for the analysis of rare gases in lunar soil, such as the Chinese patents CN118243770A and CN108801712A. The former reduces the amount of lunar soil tested while maintaining high efficiency in experimental operations, ensuring that various rare gas isotope systems can be compared in the same sample; the latter directly extracts rare gases in situ.

[0005] For the lunar soil samples that have been returned to land from the moon, since the samples are not easy to source, reducing sample loss and avoiding waste are also issues that need to be addressed. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a valve assembly and a low-loss purification device for trace Kr gas in lunar soil, which can reduce gas loss and avoid waste during the separation and purification process of trace Kr gas in lunar soil.

[0007] The object of the present invention is to provide a valve assembly, comprising a mounting seat, an upstream communication port, a downstream communication port and a negative pressure communication port are arranged around the mounting seat, the upstream communication port, the downstream communication port and the negative pressure communication port are all connected to the hollow cavity inside the mounting seat, and the negative pressure communication port is connected to a negative pressure chamber;

[0008] The mounting seat is also provided with a rotary switch, which includes a blocking portion, a rotating body that penetrates the mounting seat, and one end of which is rotatably connected to the hollow cavity, and the outer wall of the rotating body is located inside the hollow cavity, and the blocking portion, the first conveying portion, and the second conveying portion are sequentially arranged along the circumferential direction;

[0009] The valve assembly includes three structural states, wherein the first structural state is that the negative pressure communication port is connected to the blocking portion, the upstream communication port is connected to the first conveying portion, and the second conveying portion is connected to the downstream communication port; the second structural state is that the blocking portion is connected to the downstream communication port, the upstream communication port is connected to the second conveying portion, and the negative pressure communication port is connected to the first conveying portion; the third structural state is that the blocking portion is connected to the upstream communication port, the second conveying portion is connected to the negative pressure communication port, and the first conveying portion is connected to the downstream communication port;

[0010] A filling layer is arranged on one side between the first conveying part and the second conveying part. The first conveying part and the second conveying part are communicated with each other. The blocking part, the first conveying part, the second conveying part and the filling layer fill the hollow cavity.

[0011] Preferably, the hollow cavity is a cylindrical cavity.

[0012] Preferably, the connection point between the upstream connecting port and the hollow cavity, the connection point between the downstream connecting port and the hollow cavity, and the connection point between the negative pressure connecting port and the hollow cavity are distributed in a circular array on the side wall of the hollow cavity.

[0013] Preferably, the blocking portion is a telescopic body, and the filling layer is a telescopic body or a non-telescoping body.

[0014] Preferably, the telescopic body is an elastic rubber block or a silicone rubber block, and the non-telescopic body is a rigid block.

[0015] Preferably, a rotation-assisting device is provided between the blocking portion and the rotary switch, and between the filling layer and the rotary switch.

[0016] Preferably, the rotation-assisting device is a ball bearing or a slide rail.

[0017] Preferably, the filling layer and the outer wall of the sealing portion are both provided with grooves at positions for contacting the rotation-assisting device, and the grooves are matched and connected with the rotation-assisting device in a one-to-one correspondence.

[0018] Preferably, a connecting pipe is directly provided between the first conveying part and the second conveying part, or the first conveying part and the second conveying part are connected via a channel provided in the rotating body.

[0019] The present invention provides a low-loss purification device for trace Kr gas in lunar soil including the valve assembly, including a collecting device and an isotope analysis device, wherein the collecting device and the isotope analysis device are connected via the valve assembly.

[0020] Compared with the prior art, the present invention has the following beneficial effects: the present invention provides a low-loss purification device for trace Kr gas in lunar soil, the mounting seat is a base, the upstream connecting port, the downstream connecting port, the negative pressure connecting port and the rotary switch are necessary components for realizing the conversion of the three structural states of the valve assembly, and the plugging part, the first conveying part, the second conveying part and the filling layer fill the hollow cavity to prevent air leakage. Under the action of the above-mentioned valve assembly, the above-mentioned process can fully transfer the residual gas in the upstream pipeline to the downstream pipeline for easy utilization, thereby timely collecting the residual Kr gas in the pipeline to reduce the loss of trace Kr gas in the lunar soil and avoid waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a cross-sectional view of the valve assembly of the present invention in the first structural state.

[0022] Figure 2 It is a cross-sectional view of the valve assembly of the present invention in the second structural state.

[0023] Figure 3 It is a cross-sectional view of the valve assembly of the present invention in the third structural state.

[0024] Figure 4 For the present invention Figure 1 Side view Figure 1 , the mounting plate is annular.

[0025] Figure 5 For the present invention Figure 1 Side view Figure 2 , the mounting plate is block-shaped.

[0026] Figure 6 It is a three-dimensional structural diagram of the valve assembly of the present invention.

[0027] Figure 7 This is a disassembled structural diagram of the valve assembly of the present invention.

[0028] Figure 8 This is a structural diagram of the low-loss purification device for trace Kr gas in lunar soil.

[0029] Fig. 9 Schematic diagram of the connection between the valve assembly and the collection device. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand and implement the technical solution of the present invention, the present invention is further described below in conjunction with specific embodiments and drawings.

[0031] In the description of the present invention, unless otherwise specified, all reagents used are commercially available and all methods used are conventional techniques in the art.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0033] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0034] At present, the process of obtaining lunar soil samples is costly and difficult, and the quality of the samples obtained at one time is also limited. In addition, the content of Kr gas in lunar soil is not high, and the amount of Kr gas samples is relatively rare and precious. It is necessary to rely on precision equipment to reduce the loss of Kr gas during the purification process. Although Chinese patent CN116296671A can purify and analyze Kr gas, the technical problem it solves is how to reduce the impact of natural gas samples on the V0 port pipeline, and it cannot reduce the loss of Kr gas. In the actual experimental process, see Fig. 9When a valve is closed, the gas filled in the upstream pipeline 40 can no longer enter the downstream pipeline 50, resulting in gas loss and waste. For example, the device storing the gas volatilized from the lunar soil is connected to the V0 valve. According to the method of CN116296671A, after the operation of "closing the V3 valve and the V1 valve, opening the V2 valve and the V4 valve, maintaining for 2 minutes, and using the V4 valve at the liquid nitrogen temperature to cool the Kr gas and Xe gas in the enriched sample", although most of the gas including the Kr gas and the Xe gas enters the collection device 4, a small amount of Kr gas remains in the pipeline between the valve V1 and the valve V4. Then, when the operation of "closing the valve V4, opening the valve Vf and the valve V1, and extracting the remaining sample" is adopted, the Kr gas remaining in these pipelines is also extracted and wasted, resulting in Kr gas loss, which is extremely unfriendly to the rare Kr gas in the lunar soil. In addition, the amount of Kr gas in the lunar soil is relatively small, unlike natural gas, which has a large transmission pressure. Therefore, the present invention proposes for the first time the technical problem of "reducing the residual gas in the pipeline to reduce the loss of trace Kr gas in the lunar soil and avoid waste", and proposes a valve assembly for timely collecting the residual Kr gas in the pipeline to reduce the loss of trace Kr gas in the lunar soil and improve the purification amount and utilization rate of precious Kr gas samples in the lunar soil.

[0035] In the present invention, the valve assembly refers to Figure 1 and Fig. 9, including a mounting seat 10, an upstream connecting port 12, a downstream connecting port 121 and a negative pressure connecting port 122 are arranged around the mounting seat 10, the upstream connecting port 12, the downstream connecting port 121 and the negative pressure connecting port 122 are all connected to the hollow cavity 13 inside the mounting seat 10, wherein the negative pressure connecting port 122 is connected to the negative pressure chamber 20, the upstream connecting port 12 is used to connect the upstream pipeline 40, and the downstream connecting port 121 is used to connect the downstream pipeline 50; a rotary switch 30 is also arranged on the mounting seat 10, and the rotary switch 30 includes a blocking portion 31, a first conveying portion 32, a second conveying portion 33, a rotating body 34 and a filling layer 35, the rotating body 34 is arranged through the mounting seat 10, and one end is rotatably connected to the hollow cavity 13, and the other end is located outside the mounting seat 10, the blocking portion 31, the first conveying portion 32, the second conveying portion 33 and the filling layer 35 are all arranged on the outer wall of the rotating body 34, and the blocking portion 31, the first conveying portion 32, the second conveying portion 33 And the filling layer 35 are all located inside the hollow cavity 13. With the rotation of the rotating body 34, the blocking portion 31, the first conveying portion 32 and the second conveying portion 33 can rotate to be connected to the corresponding upstream connecting port 12, the downstream connecting port 121 and the negative pressure connecting port 122, and the negative pressure connecting port 122 connected to the blocking portion 31 is blocked and cannot be ventilated, while the upstream connecting port 12 or the downstream connecting port 121 connected to the first conveying portion 32 and the second conveying portion 33 can be ventilated smoothly. In order to better ensure the continuous switching of the three structural states of the valve assembly and prevent air leakage during switching, the blocking portion 31 is connected to one side between the first conveying portion 32 and the second conveying portion 33, and the first conveying portion 32 and the second conveying portion 33 are connected. A filling layer 35 is provided on the other side between the first conveying portion 32 and the second conveying portion 33. The blocking portion 31, the first conveying portion 32, the second conveying portion 33 and the filling layer 35 fill the hollow cavity 13.

[0036] In the present invention, the valve assembly includes three structural states. The first structural state is shown in Figure 1 , is connected with the negative pressure communication port 122 and the blocking portion 31, and blocks it, the upstream communication port 12 is connected with the first conveying portion 32, the second conveying portion 33 is connected with the downstream communication port 121, and the first conveying portion 32 and the second conveying portion 33 are ventilated, and the upstream pipeline 40 and the downstream pipeline 50 are also ventilated; the second structural state refers to Figure 2 , the blocking portion 31 is connected to the downstream communication port 121, the upstream communication port 12 is connected to the second conveying portion 33, and the negative pressure communication port 122 is connected to the first conveying portion 32, so that the negative pressure chamber 20 and the upstream pipeline 40 are ventilated, and the residual gas in the upstream pipeline 40 is extracted and stored through the negative pressure chamber 20; the third structural state refers to Figure 3, the blocking part 31 is connected to the upstream communication port 12, the first conveying part 32 is connected to the downstream communication port 121, and the second conveying part 33 is connected to the negative pressure communication port 122, then the residual gas extracted from the upstream pipeline 40 stored in the negative pressure chamber 20 flows into the downstream pipeline 50. The above process can fully transfer the residual gas in the upstream pipeline 40 to the downstream pipeline 50 for easy utilization, thereby timely collecting the residual Kr gas in the pipeline to reduce the loss of trace Kr gas in the lunar soil.

[0037] Furthermore, the present invention provides a low-loss purification device for trace Kr gas in lunar soil used in conjunction with a valve assembly, and a corresponding purification method to meet the scientific research needs of the scarce rare gas in the lunar soil.

[0038] Specific embodiments of the present invention are described below.

[0039] Example 1

[0040] A valve assembly, referring to Figure 1 , Figure 4 and Figure 5 , including a mounting seat 10, which is a cubic structure or a cylindrical structure, made of opaque material, and can also refer to the material of the gas valve in the prior art. The main function of the mounting seat 10 is to carry other components.

[0041] An annular slide groove 11 is provided around the outer wall of the mounting seat 10. The width and depth of the slide groove 11 are determined by the diameters of the upstream pipe 40 and the downstream pipe 50. It is necessary to ensure that the pipe openings of the upstream pipe 40 and the downstream pipe 50 can be inserted into the slide groove 11, and the upstream pipe 40 and the downstream pipe 50 can wrap the edges of the upstream connecting port 12, the downstream connecting port 121 and the negative pressure connecting port 122.

[0042] The depth of the chute 11 is Figure 1 The width of the slot 11 is the distance from the side wall of the mounting seat 10 shown in the middle, and the width of the slot 11 is the distance from the side wall of the mounting seat 10 shown in the middle. Figure 1 The distance in the paper direction, Figure 4 yes Figure 1 The side structural diagram of the embodiment of the present invention shows that the width of the chute 11 is greater than the diameters of the upstream communication port 12, the downstream communication port 121 and the negative pressure communication port 122. The upstream communication port 12, the downstream communication port 121 and the negative pressure communication port 122 are all provided on the side of the chute 11 along the width direction. The upstream pipe 40, the downstream pipe 50 and the negative pressure chamber 20 are all provided with a mounting plate 60 to facilitate the connection of the upstream pipe 40, the downstream pipe 50 and the negative pressure chamber 20 with the chute 11. Sealing rings are provided between the upstream pipe 40 and the chute 11, between the downstream pipe 50 and the chute 11, and between the negative pressure chamber 20 and the chute 11 to prevent air leakage.

[0043] The shapes of the upstream communication port 12, the downstream communication port 121 and the negative pressure communication port 122 are circular, square or other irregular shapes. In order to allow the gas to flow smoothly without causing too much pressure fluctuation, the upstream communication port 12, the downstream communication port 121 and the negative pressure communication port 122 are circular, and the diameter of the circle is 1mm to 3mm smaller than the inner diameter of the upstream pipe 40 and the downstream pipe 50. Figure 5 , the inner diameters of the upstream pipe 40 and the downstream pipe 50 are the same. The upstream communication port 12, the downstream communication port 121 and the negative pressure communication port 122 are all connected to the hollow cavity 13 inside the mounting seat 10, and the hollow cavity 13 is a cylindrical cavity, which is convenient for the rotation of the rotary switch 30. The negative pressure communication port 122 is connected to the mounting plate 60, so that the negative pressure communication port 122 is connected and connected to the negative pressure chamber 20. Similarly, the upstream communication port 12 is used to connect the upstream pipe 40 through the mounting plate 60, and the downstream communication port 121 is used to connect the downstream pipe 50 through the mounting plate 60. The connection seams between these components are all provided with sealing rings or sealants to prevent air leakage.

[0044] The mounting seat 10 is also provided with a rotary switch 30, which includes a blocking portion 31, a first conveying portion 32, a second conveying portion 33, a rotating body 34 and a filling layer 35. The rotating body 34 vertically penetrates the mounting seat 10, and one end of the rotating body 34 is rotatably connected to the center of the hollow cavity 13, and the other end is located outside the mounting seat 10. Figure 6 and Figure 7 As shown, Figure 7 In order to facilitate observation of the positional relationship between the rotating body 34 and the mounting base 10, the rotating body 34 is split into two parts for drawing, one part is located inside the hollow cavity 13, and the other part is located outside the mounting base 10. However, it should be noted that in the actual structure of the rotary switch 30, the rotating body 34 is a whole to ensure service life.

[0045] Continue to refer to Figure 7 , the blocking portion 31, the first conveying portion 32, the second conveying portion 33 and the filling layer 35 are all arranged on the outer wall of the rotating body 34, and the blocking portion 31, the first conveying portion 32, the second conveying portion 33 and the filling layer 35 are all located inside the hollow cavity 13. Preferably, the connection point between the upstream communication port 12 and the hollow cavity 13, the connection point between the downstream communication port 121 and the hollow cavity 13, and the connection point between the negative pressure communication port 122 and the hollow cavity 13 are distributed in an annular array along the circumferential direction of the side wall of the hollow cavity 13, and when the blocking portion 31, the first conveying portion 32 and the second conveying portion 33 are all columnar, a 120-degree angle is formed between the blocking portion 31 and the first conveying portion 32, between the first conveying portion 32 and the second conveying portion 33, and between the second conveying portion 33 and the blocking portion 31, so as to facilitate the continuous switching of the three structural states of the valve assembly.

[0046] In order to better ensure the continuous switching of the three structural states of the valve assembly and prevent air leakage during switching, the blocking portion 31 is connected to one side between the first conveying portion 32 and the second conveying portion 33. The first conveying portion 32 and the second conveying portion 33 are both hollow tubes, and the first conveying portion 32 and the second conveying portion 33 are connected. For example, a connecting pipe is directly arranged between the first conveying portion 32 and the second conveying portion 33, or the first conveying portion 32 and the second conveying portion 33 are connected via a channel 341 arranged in the rotating body 34. A filling layer 35 is arranged on the other side between the first conveying portion 32 and the second conveying portion 33, and the blocking portion 31, the first conveying portion 32, the second conveying portion 33 and the filling layer 35 fill the hollow cavity 13.

[0047] Preferably, the blocking portion 31 is a telescopic body, such as an elastomer, more specifically an elastic rubber block or a silicone rubber block, which can extend into the corresponding upstream connecting port 12, downstream connecting port 121 and negative pressure connecting port 122 during blocking, thereby achieving a good blocking effect.

[0048] Preferably, the filling layer 35 is a non-expandable body to prevent it from extending into the upstream communication port 12, the downstream communication port 121 and the negative pressure communication port 122 during rotation. More specifically, the non-expandable body is a rigid block, such as a metal block, an alloy block, a stainless steel block or a hard plastic block.

[0049] As the rotating body 34 rotates, the blocking portion 31, the first conveying portion 32 and the second conveying portion 33 can rotate to connect with the corresponding upstream communication port 12, the downstream communication port 121 and the negative pressure communication port 122, and the negative pressure communication port 122 connected to the blocking portion 31 is blocked and cannot be ventilated, while the upstream communication port 12 or the downstream communication port 121 connected to the first conveying portion 32 and the second conveying portion 33 can be ventilated smoothly. Specifically, in the present invention, the valve assembly includes three structural states. The first structural state is shown in FIG. Figure 1 , the negative pressure communication port 122 is connected to the blocking portion 31 and blocked, the upstream communication port 12 is connected to the first conveying portion 32, the second conveying portion 33 is connected to the downstream communication port 121, the first conveying portion 32 and the second conveying portion 33 are ventilated, and the upstream pipeline 40 and the downstream pipeline 50 are also ventilated; the second structural state refers to Figure 2 , the blocking portion 31 is connected to the downstream communication port 121, the upstream communication port 12 is connected to the second conveying portion 33, and the negative pressure communication port 122 is connected to the first conveying portion 32, so that the negative pressure chamber 20 and the upstream pipeline 40 are ventilated, and the residual gas in the upstream pipeline 40 is extracted and stored through the negative pressure chamber 20; the third structural state refers to Figure 3, the blocking part 31 is connected to the upstream communication port 12, the first conveying part 32 is connected to the downstream communication port 121, and the second conveying part 33 is connected to the negative pressure communication port 122, then the residual gas extracted from the upstream pipeline 40 stored in the negative pressure chamber 20 flows into the downstream pipeline 50. The above process can fully transfer the residual gas in the upstream pipeline 40 to the downstream pipeline 50 for easy utilization, thereby timely collecting the residual Kr gas in the pipeline to reduce the loss of trace Kr gas in the lunar soil and avoid waste.

[0050] Preferably, in order to ensure the smoothness of the rotation of the rotary switch 30, a rotation-assisting device 131 is provided between the blocking portion 31 and the rotary switch 30, and between the filling layer 35 and the rotary switch 30. Specifically, a rotation-assisting device 131 is provided between the blocking portion 31 and the inner wall of the hollow cavity 13 where the upstream connecting port 12, the downstream connecting port 121 and the negative pressure connecting port 122 are not provided, and between the filling layer 35 and the inner wall of the hollow cavity 13 where the upstream connecting port 12, the downstream connecting port 121 and the negative pressure connecting port 122 are not provided. The rotation-assisting device 131 is a ball bearing or a slide rail, and the rotation-assisting device 131 can be matched and connected with the filling layer 35 and the blocking portion 31. More specifically, the outer walls of the filling layer 35 and the blocking portion 31 are provided with grooves at positions for contacting the rotation-assisting device 131, and the grooves are matched and connected with the rotation-assisting device 131 in a one-to-one manner, providing a track for the rotation-assisting device 131. This structure not only ensures the smooth conversion of the three working states of the valve assembly, but also ensures that the interior of the valve assembly is always leak-proof. During the switching process of the valve assembly, except for the first conveying part 32, the second conveying part 33, the upstream connecting port 12, the downstream connecting port 121 and the negative pressure connecting port 122 used for the circulation of gas, the remaining parts are leak-proof. Therefore, there is no leakage in the switching process of the valve assembly, which better solves the problem of "gas loss and avoiding waste".

[0051] It should be noted that although the prior art also has switching valves, the switching valves of the solenoid valve structure only have a switching function and cannot recover the residual gas in the pipeline. The three-way type switching valve can only roughly switch the three ports. The connection relationship between the components during the switching process is not tight enough, so there will still be leakage, which cannot solve the problem of "gas loss and avoiding waste". More preferably, the blocking part 31 provided in the present invention is a telescopic body, which can fully penetrate into the interior of the upstream connecting port 12 and the like when blocking, and fully block it. When the provided filling layer 35 is a non-telescopic body, it is perfectly fitted and circulated with the rotation-assisting device 131 to ensure that there is no leakage. When the rotation-assisting device 131 is a telescopic body, it can also be perfectly fitted with the rotation-assisting device 131, and can fill various gaps that may leak to ensure that there is no leakage.

[0052] Preferably, the surface of the rotation-assisting device 131 is provided with sealing material. After the sealing material contacts the blocking part 31, the first conveying part 32, the second conveying part 33, the filling layer 35 and the rotation-assisting device 131, the sealing material can be coated on the surface of these components, which helps to seal the joints of the components and prevent air leakage. When the rotation-assisting device 131 is a ball, the sealing material is configured as sealing oil or sealing paste, which is fully filled in the gaps between different balls. As the ball rotates and continuously engages with the groove, the sealing material is continuously provided to the blocking part 31, the first conveying part 32, the second conveying part 33, and the filling layer 35 to help them seal. In the present invention, the ball also plays a role in supplementing the sealing material.

[0053] Example 2

[0054] A low-loss purification device for trace Kr gas in lunar soil, referring to Figures 1 to 9 , including a Kr isotope analysis device body and a valve assembly. The structure of the Kr isotope analysis device body refers to the device of CN116296671A, including a negative pressure device 2, a water absorption device 3, a collection device 4, a reaction adsorption device 5, a filtering device 6, an over-negative pressure device 7, a separation device 8 and an isotope analysis device 9, and the connection method also refers to the patent. CN116296671A is the prior research result of the present invention. The present invention replaces at least one of the valves V0, valve V1, valve V2, valve V3, valve V4, valve V5, valve V6, valve V7, valve V8, valve V9, valve V10, valve V11, and valve Vf in CN116296671A with a valve assembly of Example 1 of the present invention, which is recorded as valve assembly V4. This embodiment specifically replaces the structure of valve V4 in CN116296671A with valve assembly V4 of Example 1 of the present invention to illustrate the connection relationship and working principle. The upstream of valve V0 is used to connect to the storage device of the rare gas of the lunar soil, and valve T1 is set on the storage device of the rare gas of the lunar soil.

[0055] The method for analyzing Kr isotopes is as follows:

[0056] First, connect the storage device of the lunar soil gas, such as a storage bottle, to valve V0, open valves V0 and Vf, and evacuate to 10 -5 Pa; then close valve Vf, open valve T1, keep for 20s, then close valve V0, take a part of the gas between valve V0 and valve V1, for example, take 1mL for standby; cool valve V3 to maintain the temperature of alcohol + liquid nitrogen, open valve V1 and valve V3, keep for 2min, remove water; then close valve V3 and valve V1, open valve V2 and valve assembly V4, keep for 2min; wherein, opening valve assembly V4 means that the blocking part 31 blocks the negative pressure communication port 122, that is, valve assembly V4 is in Figure 1The first structural state; using the valve assembly V4 at liquid nitrogen temperature to cool the Kr and Xe components in the enriched sample; then closing the valve assembly V4, that is, first plugging the downstream communication port 121 with the plugging portion 31, the valve assembly V4 is in Figure 2 In the second structural state, the negative pressure chamber 20 draws away the remaining sample until the vacuum degree returns to 10 -5 Pa, and then the upstream communication port 12 is blocked with the blocking portion 31, and the valve assembly V4 is in Figure 3 The third structural state is to discharge the gas in the negative pressure chamber 20 into the collecting device 4. Then the above steps are repeated 10-15 times to carry out the enrichment process of Kr and Xe in the natural gas sample. In the above process, the residual gas in the upstream pipeline 40 of the valve assembly V4 can be completely discharged into the collecting device 4 each time.

[0057] Then close valve V2, open valve assembly V4, raise the temperature at valve assembly V4 to 100°C, and release the collected Kr and Xe components. The release process is basically the same as the working principle of regulating valve assembly V4 in the process of collecting gas in the collection device 4, except that the release process and the "upstream pipeline" and "downstream pipeline" corresponding to valve assembly V4 in the process of collecting gas in the collection device 4 are reversed, that is, in the release process, Fig. 9 The reference numerals of the upstream pipeline 40 and the downstream pipeline 50 are swapped, and then the valve assembly V4 is operated again according to the above-mentioned "process of collecting gas into the collecting device 4". Then all the gas in the collecting device 4 can be released to the downstream.

[0058] Then close valve V5, open valve V6, raise the temperature of the titanium sponge furnace to 800°C, and maintain for 10 min to further remove the residual active gas in the sample. At the same time, the suction pump removes H 2 ; Then close valve V9, open valve V10 and valve V11, lower the temperature of the cryogenic pump to 140K, collect the Xe component, and keep it for 10 minutes; then close valve V11, open valve V9 to send Kr gas to the rare gas mass spectrometer for Kr isotope analysis. The above process realizes the purification and analysis of Kr gas.

[0059] Of course, the downstream of valve V9 can also be connected to a storage device to collect the purified Kr gas.

[0060] It should be noted that the component connection relationships not specifically mentioned in the present invention are assumed to adopt the existing technology. Since they do not involve the invention point and are widely used in the existing technology, the structural connection relationships are not described in detail.

[0061] It should be noted that when the present invention involves a numerical range, it should be understood that the two endpoints of each numerical range and any value between the two endpoints can be selected. Since the steps and methods used are the same as those in the embodiments, in order to avoid redundancy, the present invention describes a preferred embodiment. Although the preferred embodiments of the present invention have been described, once those skilled in the art know the basic inventive concept, they can make other changes and modifications to these embodiments, and these changes and modifications all fall within the scope of the present invention.

[0062] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. If these modifications and variations of the present invention fall within the scope of the equivalent technology of the present invention, the present invention is also intended to include these modifications and variations.

Claims

1. A valve assembly, characterized in that: It comprises a mounting seat (10), an upstream communication port (12), a downstream communication port (121) and a negative pressure communication port (122) are arranged around the mounting seat (10), the upstream communication port (12), the downstream communication port (121) and the negative pressure communication port (122) are all connected to a hollow cavity (13) inside the mounting seat (10), and the negative pressure communication port (122) is connected to a negative pressure chamber (20); The mounting seat (10) is also provided with a rotary switch (30), the rotary switch (30) comprising a blocking portion (31), a rotating body (34) penetrating the mounting seat (10), and one end of the rotating body (34) being rotatably connected to the hollow cavity (13), the outer wall of the rotating body (34) being located inside the hollow cavity (13), and the blocking portion (31), the first conveying portion (32) and the second conveying portion (33) being sequentially provided along the circumferential direction; The valve assembly includes three structural states, wherein the first structural state is that the negative pressure communication port (122) is connected to the blocking portion (31), the upstream communication port (12) is connected to the first conveying portion (32), and the second conveying portion (33) is connected to the downstream communication port (121); the second structural state is that the blocking portion (31) is connected to the downstream communication port (121), the upstream communication port (12) is connected to the second conveying portion (33), and the negative pressure communication port (122) is connected to the first conveying portion (32); the third structural state is that the blocking portion (31) is connected to the upstream communication port (12), the second conveying portion (33) is connected to the negative pressure communication port (122), and the first conveying portion (32) is connected to the downstream communication port (121); A filling layer (35) is provided on one side between the first conveying part (32) and the second conveying part (33); the first conveying part (32) and the second conveying part (33) are connected; the blocking part (31), the first conveying part (32), the second conveying part (33) and the filling layer (35) fill the hollow cavity (13).

2. The valve assembly according to claim 1, characterized in that The hollow cavity (13) is a cylindrical cavity.

3. The valve assembly according to claim 1, characterized in that The connection point between the upstream communication port (12) and the hollow cavity (13), the connection point between the downstream communication port (121) and the hollow cavity (13), and the connection point between the negative pressure communication port (122) and the hollow cavity (13) are distributed in a circular array on the side wall of the hollow cavity (13).

4. The valve assembly according to claim 1, characterized in that The blocking portion (31) is a telescopic body, and the filling layer (35) is a telescopic body or a non-telescopic body.

5. The valve assembly according to claim 4, characterized in that The telescopic body is an elastic rubber block or a silicone rubber block, and the non-telescopic body is a rigid block.

6. The valve assembly according to claim 1, characterized in that A rotation-assisting device (131) is provided between the blocking portion (31) and the rotary switch (30), and between the filling layer (35) and the rotary switch (30).

7. The valve assembly according to claim 1, characterized in that The rotation-assisting device (131) is a ball bearing or a slide rail.

8. The valve assembly according to claim 7, characterized in that The filling layer (35) and the outer wall of the sealing portion (31) are both provided with grooves at positions for contacting the rotation-assisting device (131), and the grooves are matched and connected with the rotation-assisting device (131) in a one-to-one correspondence.

9. The valve assembly according to claim 1, characterized in that A connecting pipe is directly provided between the first conveying part (32) and the second conveying part (33), or the first conveying part (32) and the second conveying part (33) are connected via a channel (341) provided in the rotating body (34).

10. A low-loss purification device for trace Kr gas in lunar soil comprising the valve assembly according to claim 1, characterized in that: It comprises a collecting device (4) and an isotope analysis device (9), wherein the collecting device (4) and the isotope analysis device (9) are connected via the valve assembly.

Images