A testing device and method for determining the adsorption characteristics of lunar soil volatile components

Abstract

The application provides a testing device and a testing method for determining adsorption characteristics of lunar soil volatile components, and belongs to the technical field of lunar soil in-situ detection. The device can solve the problem that the existing device cannot complete adsorption characteristic tests of different gases on the ground. The device comprises a compression bellows, a vacuum gauge, a mechanical pump, a nitrogen tank, a helium tank and a test tube. The test tube, the helium tank, the nitrogen tank and the mechanical pump are sequentially connected to the outlet end of the compression bellows from near to far, and the vacuum gauge is arranged between the compression bellows and the test tube. The device is mainly used for testing the adsorption characteristics of lunar soil volatile components.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of lunar soil in-situ detection, and particularly relates to a testing device and a testing method for determining adsorption characteristics of lunar soil volatile components. BACKGROUND

[0002] When lunar soil is analyzed in-situ, various gases are released, and in the process of diffusion of the gases to the analyzer, part of the gases are adsorbed on the inner wall of the pipeline or instrument, which affects the measurement results. Therefore, the adsorption characteristics of different gases need to be tested on the ground to reduce the on-orbit measurement error of the gases. SUMMARY

[0003] Therefore, the present application aims to provide a testing device and a testing method for determining adsorption characteristics of lunar soil volatile components to solve the problem that the existing device cannot complete the adsorption characteristics test of different gases on the ground.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0005] A testing device for determining adsorption characteristics of lunar soil volatile components, comprising a compressed bellows, a vacuum gauge, a mechanical pump, a nitrogen tank, a helium tank and a test tube, the test tube, the helium tank, the nitrogen tank and the mechanical pump are connected to the outlet end of the compressed bellows in sequence from near to far, and the vacuum gauge is arranged between the compressed bellows and the test tube.

[0006] Further, a linear module is arranged below the compressed bellows.

[0007] Further, a hand wheel is installed on the compressed bellows.

[0008] Further, a second baffle valve is arranged at the outlet end of the test tube.

[0009] Further, the test tube is filled with liquid droplets required for testing.

[0010] Further, a first baffle valve is arranged between the second baffle valve and the vacuum gauge.

[0011] Further, a third baffle valve is arranged at the outlet end of the helium tank.

[0012] Further, a fourth baffle valve is arranged at the outlet end of the nitrogen tank.

[0013] Further, a fourth baffle valve is arranged at the outlet end of the nitrogen tank.

[0014] A testing method for a testing device for determining adsorption characteristics of lunar soil volatile components, comprising the following steps:

[0015] Step 1: Before the test, the cavity volume V is obtained by injecting alcohol in the vacuum system, and the mechanical pump 10 is started after the pipeline is dried;

[0016] Step 2: The third baffle valve 7 and the first baffle valve 5 are opened, helium is filled, and the pressure value p1 is obtained, then the first baffle valve 5 is closed, the hand wheel 1 is shaken to compress the bellows 3, and the vacuum gauge value p under different compression amounts is obtained i According to the Boyle's law, the cavity volume V under different compression amounts can be obtained i ;

[0017] Step 3: When the pressure value reaches the target value, the fifth baffle valve 9 is closed, the second baffle valve 6 is opened, and the water vapor in the test tube enters the cavity, the pressure value is increased to p1, the first baffle valve 5 is closed, the hand wheel 1 is shaken to compress the compression bellows 3, and the cavity volume is changed, at this time, the pressure value just reaches the target compression amount, and the adsorption still occurs obviously, and the p value is recorded after the steady state is reached i ;

[0018] Step 4: The adsorption characteristics of the water vapor are obtained by comparing the vacuum gauge 4 values of steps 2 and 3.

[0019] Compared with the prior art, the beneficial effects of the present application are:

[0020] 1. The present application realizes the measurement of the adsorption characteristics of various lunar soil volatile gases by changing the volume of the vacuum pipeline through the compression bellows.

[0021] 2. The high-precision linear module can accurately control the compression amount to realize the high-precision control of the cavity volume, improve the measurement accuracy of the gas adsorption characteristics, and the device is simple and convenient to operate. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which form a part of the present application, are used to provide further understanding of the present application, and the schematic embodiments of the present application and the description thereof are used to explain the present application, and do not constitute improper limitations on the present application. In the drawings:

[0023] Figure 1 It is a structure schematic view of a test device for determining the adsorption characteristics of lunar soil volatile components.

[0024] 1-hand wheel, 2-linear module, 3-compression bellows, 4-vacuum gauge, 5-first baffle valve, 6-second baffle valve, 7-third baffle valve, 8-fourth baffle valve, 9-fifth baffle valve, 10-mechanical pump, 11-nitrogen tank, 12-helium tank, 13-test tube. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict, and the described embodiments are only some of the embodiments of the present application, but not all the embodiments.

[0026] Referring to Figure 1 The present embodiment is described as follows. A testing device for determining adsorption characteristics of lunar soil volatiles includes a compression bellows 3, a vacuum gauge 4, a mechanical pump 10, a nitrogen tank 11, a helium tank 12, and a test tube 13. The test tube 13, the helium tank 12, the nitrogen tank 11, and the mechanical pump 10 are sequentially connected to an outlet end of the compression bellows 3 from near to far. The vacuum gauge 4 is arranged between the compression bellows 3 and the test tube 13. A hand wheel 1 is arranged on the compression bellows 3. A second baffle valve 6 is arranged at an outlet end of the test tube 13. The test tube 13 is filled with liquid droplets required for testing. A first baffle valve 5 is arranged between the second baffle valve 6 and the vacuum gauge 4. A third baffle valve 7 is arranged at an outlet end of the helium tank 12. A fourth baffle valve 8 is arranged at an outlet end of the nitrogen tank 11. A fifth baffle valve 9 is arranged at an outlet end of the mechanical pump 10.

[0027] First, the mechanical pump 10 is started, and the air pressure of the pipeline is reduced. When the air pressure value reaches a target value, the fifth baffle valve 9 is closed, and the second baffle valve 6 is opened, so that the water vapor in the test tube 13 enters the cavity, the air pressure value is increased, the first baffle valve 5 is closed, the hand wheel 1 is shaken, the compression bellows 3 is compressed, the volume of the cavity is changed, the vacuum gauge 4 is read at different compression amounts, the third baffle valve 7 is opened again, the helium is filled, the compression of the compression bellows 3 is repeated, the vacuum gauge 4 is read at different compression amounts, and the adsorption characteristics of the water vapor are obtained by comparison. The adsorption characteristics of other gases can be completed by referring to the above operation. The adsorption characteristics of multiple lunar soil volatile gases are measured by changing the volume of the vacuum pipeline through the compression bellows 3.

[0028] Further, a linear module 2 is arranged below the compression bellows 3. The high-precision linear module 2 can accurately control the compression amount, so as to accurately control the volume of the cavity and improve the measurement accuracy of the gas adsorption characteristics. Meanwhile, the device is simple and convenient to operate.

[0029] Further, a testing method of the testing device for determining the adsorption characteristics of lunar soil volatiles includes the following steps.

[0030] Step 1: Before the test, alcohol is injected into the vacuum system to obtain the volume V of the cavity. After the pipeline is dried, the mechanical pump 10 is started, and the air pressure of the pipeline is reduced.

[0031] Step 2: open the third baffle valve 7 and the first baffle valve 5, fill in helium, get the pressure reading p1, then close the first baffle valve 5, shake the hand wheel 1 to compress the bellows 3, get the vacuum gauge reading p under different compression amounts i , according to the Boyle's law, the cavity volume V under different compression amounts can be obtained i ;

[0032] Step 3: when the gas pressure reaches the target value, close the fifth baffle valve 9, open the second baffle valve 6, make the water vapor in the test tube enter the cavity, the gas pressure rises to p1, close the first baffle valve 5, shake the hand wheel 1 to compress the bellows 3, change the cavity volume, at this time, the gas pressure just reaches the target compression amount, and the steady state has not been reached, at this time, there is still obvious adsorption, after the steady state, record p i ;

[0033] Step 4: by comparing the vacuum gauge 4 readings of step 2 and step 3, the adsorption characteristics of water vapor can be obtained.

[0034] The specific calculation method is, according to the helium compression test group p1V=p i V i The volume of the vacuum cavity under different compression amounts can be obtained, in the water vapor compression test, according to the ideal gas state equation pV=nRT, the amount of substance n of water vapor in the cavity can be obtained, this physical quantity will be affected by the adsorption effect in the compression process, a part of which is converted into liquid water, thereby affecting the pressure change, according to the pressure difference, the adsorption amount can be calculated. In the water vapor compression process, the volume V i at the i-th compression point has been obtained by step 2, and the theoretical pressure (not yet adsorbed) can be calculated according to this, that is, p t , according to the test, the actual pressure at this time is p i ,△p=p i -p t is the pressure difference generated by adsorption, according to the ideal gas state equation, the amount of substance△n of adsorbed water vapor can be obtained, and the adsorption characteristics under this working condition are the ratio of the amount of substance of adsorbed water vapor to the total amount of water vapor, that is,△n / n.

[0035] The above disclosed embodiments of the present application are only used to help explain the present application. The embodiments do not describe all the details, nor limit the application to the specific embodiments described. According to the content of the specification, many modifications and changes can be made. The specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present application, so that those skilled in the art can well understand and utilize the present application.

Claims

1. A test device for determining the adsorption characteristics of lunar soil volatiles, characterized by: It comprises a compression bellows (3), a vacuum gauge (4), a mechanical pump (10), a nitrogen tank (11), a helium tank (12) and a test tube (13), the test tube (13), the helium tank (12), the nitrogen tank (11) and the mechanical pump (10) are sequentially connected to the outlet end of the compression bellows (3) from near to far, the vacuum gauge (4) is arranged between the compression bellows (3) and the test tube (13), the outlet end of the test tube (13) is provided with a second baffle valve (6), the first baffle valve (5) is arranged between the second baffle valve (6) and the vacuum gauge (4), the helium tank (12) is provided with a third baffle valve (7) at the outlet end, the nitrogen tank (11) is provided with a fourth baffle valve (8) at the outlet end, and the mechanical pump (10) is provided with a fifth baffle valve (9) at the outlet end, and the adsorption characteristics of various lunar soil volatile gases are measured by changing the volume of the vacuum pipeline through the compression bellows (3). 2.The device for determining the adsorption characteristics of lunar soil volatile components according to claim 1, characterized in that: A linear module (2) is arranged below the compression bellows (3). 3.The device for determining the adsorption characteristics of volatile components in lunar soil according to claim 1, wherein: A hand wheel (1) is arranged on the compression bellows (3).

4. The testing device for determining the adsorption characteristics of lunar soil volatile components according to claim 1, characterized in that: The test tube (13) is provided with liquid drops required for testing.

5. The test method for the test device for determining the adsorption characteristics of lunar soil volatile components according to claim 1, characterized in that: It comprises the following steps: Step 1: Before the test, inject alcohol into the vacuum system to obtain the cavity volume V, and then open the mechanical pump (10) after the pipeline is dried to reduce the air pressure of the pipeline; Step 2: open the third baffle valve (7) and the first baffle valve (5), fill in helium, get the pressure gauge reading p1, then close the first baffle valve (5), shake the hand wheel (1) to compress the bellows (3), get the vacuum gauge reading p under different compression amounts i , according to the Boyle's law, the cavity volume V under different compression amounts is obtained i ; Step 3: When the air pressure value reaches the target value, close the fifth baffle valve (9) and open the second baffle valve (6) to make the water vapor in the test tube enter the cavity, and the air pressure value rises to p1. Close the first baffle valve (5) and shake the hand wheel (1) to compress the compression bellows (3) and change the volume of the cavity. At this time, the air pressure just reaches the target compression amount and has not yet reached a steady state. At this time, there is still significant adsorption. After the steady state is reached, the p i ; Step 4: By comparing the readings of the vacuum gauges (4) in steps 2 and 3, the adsorption characteristics of water vapor are obtained.

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