CN110559746B - Waste gas recovery experiment system and implementation method - Google Patents

Abstract

The invention discloses an exhaust gas recovery system and an implementation method. In the embodiment of the present invention, an exhaust gas recovery unit is added to a vacuum/pressurization experimental system. The exhaust gas recovery unit is connected to one end of the vacuum unit of the experimental system and receives The waste gas generated by the experiment is stored in the provided recovery gas bottle. In this way, the embodiment of the present invention realizes the recovery of the waste gas while providing the vacuum/pressure working conditions of the experiment.

Description

An exhaust gas recovery experimental system and implementation method

Technical field

The invention relates to the field of experimental technology, and in particular to an exhaust gas recovery system and an implementation method.

Background technique

Space experiments conducted on satellite platforms provide a large amount of experimental data and experimental results for various fields. Therefore, various types of experiments are implemented on satellite platforms. The cost of conducting experiments on satellite platforms is very high, including launch costs, experimental energy costs, and orbital operation costs in space. In order to reduce the cost of research experiments, the principles of low cost and high reliability should be followed as much as possible in experimental design and planning. The experimental system set up in the satellite platform should complete as many different experiments as possible. Therefore, when setting up the experimental system, a dedicated The guiding ideology is to move the sexual experimental system closer to the general experimental system and expand the functions of the set experimental system as much as possible. Furthermore, considering the complexity of the satellite platform environment, the experimental system set up needs to avoid dependence on the external environment as much as possible.

Vacuum and pressurization systems can be constructed in satellite platforms to conduct vacuum and pressurized space experiments. However, completing experiments under the vacuum and/or pressurized conditions of the satellite platform requires relying on the first-level vacuum or exhaust gas interface provided by the external environment. If the gas is directly discharged to the exhaust system of the satellite platform, it will cause a waste of gas. The gas transportation cost of the satellite platform is increased, and the frequent replacement of gas bottles containing the gas required for the experiment makes it difficult to implement.

Similarly, vacuum and pressurized systems constructed on the ground will also discharge waste gas directly into the environment when completing experiments under vacuum and/or pressurized conditions, resulting in waste of gas and pollution of the environment.

Contents of the invention

In view of this, embodiments of the present invention provide an exhaust gas recovery experimental system, which can realize the recovery of exhaust gas while providing experimental vacuum/pressurization conditions.

Embodiments of the present invention provide a method for implementing an exhaust gas recovery experiment, which can realize the recovery of exhaust gas while providing experimental vacuum/pressurization conditions.

The embodiment of the present invention is implemented as follows:

An exhaust gas recovery system, including: an experimental chamber, a vacuum unit, a gas storage and supply unit, and an exhaust gas recovery unit, wherein,

The gas storage and supply unit is connected to the experimental chamber through the gas inlet, and the gas is input into the experimental chamber through the gas inlet until the pressure of the experimental chamber reaches the set value;

One end of the vacuum unit is connected to the gas outlet of the experimental cavity, and the other end is connected to the exhaust gas recovery unit. The experimental cavity is evacuated before pressurization. After the pressurization experiment is completed, the exhaust gas is recovered to the exhaust gas recovery unit. in unit;

The exhaust gas recovery unit is provided with a recovery gas bottle. The exhaust gas recovery unit is connected to the other end of the vacuum unit, and the exhaust gas received from the vacuum unit is stored in the recovery gas bottle.

It also includes: gas recovery and reuse unit. The exhaust gas recovery unit also includes a four-way switch, among which,

The four-way switch is connected to the other end of the vacuum unit and the other end of the gas recovery and reuse unit;

One end of the gas recovery and reuse unit is connected to the gas storage and supply unit. Through the opening and closing of the four-way switch, the recovered gas in the experimental cavity is recovered through the vacuum unit and input to the gas storage and supply through the gas recovery and reuse unit. stored in the unit.

The exhaust gas recovery unit includes: a four-way switch connected in series to a second boost pump, a fourth solenoid valve and a recovery gas cylinder. When the second boost pump receives the exhaust gas input from the vacuum unit and stores it in the recovery gas cylinder, the third boost pump The second booster pump is opened to boost the pressure of the exhaust gas, and the fourth solenoid valve is opened to allow the boosted exhaust gas to flow into the recovery gas bottle.

A third stop valve is also provided between the recycled gas bottle and the fourth solenoid valve to cut off the exhaust gas flowing into the recycled gas bottle.

The four-way switch in the exhaust gas recovery unit also has a concentration sensor to detect the concentration of exhaust gas. When the concentration of exhaust gas reaches the set value, the second boost pump and the fourth solenoid valve are closed to stop the inflow of exhaust gas. into recycled gas bottles.

The exhaust gas recovery unit also includes a pressure sensor of the recovered gas bottle, which is arranged between the third stop valve and the recovered gas bottle to monitor the pressure of the recovered gas bottle.

The four-way switch in the exhaust gas recovery unit opens and closes. The one-way switch at the other end of the vacuum unit is also equipped with a temperature sensor of the vacuum unit and a fifth solenoid valve. The temperature sensor of the vacuum unit monitors the temperature of the exhaust gas flowing into the exhaust gas recovery unit. When the temperature reaches the set value, the fifth solenoid valve is closed and the waste gas recovery unit stops recovering waste gas.

A method for realizing exhaust gas recovery, the method includes:

Set up experimental chamber, vacuum unit, gas storage and supply unit, and exhaust gas recovery unit;

The gas storage and supply unit is connected to the experimental chamber through the gas inlet, and the gas is input into the experimental chamber through the gas inlet until the pressure of the experimental chamber reaches the set value;

One end of the vacuum unit is connected to the gas outlet of the experimental cavity, and the other end is connected to the exhaust gas recovery unit. The experimental cavity is evacuated before pressurization. After the pressurization experiment is completed, the exhaust gas is recovered to the exhaust gas recovery unit. in unit;

The exhaust gas recovery unit is provided with a recovery gas bottle. The exhaust gas recovery unit is connected to the other end of the vacuum unit, and the exhaust gas received from the vacuum unit is stored in the recovery gas bottle.

The method also includes:

Set up a gas recovery and reuse unit, one end of the gas recovery and reuse unit is connected to the vacuum unit, and the other end is connected to the gas storage and supply unit;

The recovered gas in the experimental cavity is recovered through the vacuum unit, and is input to the gas storage and supply unit for storage through the gas recovery and reuse unit.

The method also includes:

The exhaust gas recovery unit monitors whether the gas concentration of the input exhaust gas reaches the set value, and if so, stops inputting the exhaust gas;

The set value is the concentration value of the gas storage bottle in the gas storage and supply unit, or when the set value is 0 and the vacuum value in the experimental chamber is measured to reach the set initial target vacuum value.

As seen above, in the embodiment of the present invention, a waste gas recovery unit is added to the vacuum/pressurization experimental system. The waste gas recovery unit is connected to one end of the vacuum unit of the experimental system, receives the waste gas generated by the experiment, and stores it in the set In this way, the embodiment of the present invention realizes the recovery of exhaust gas while providing experimental vacuum/pressurization conditions.

Description of the drawings

Figure 1 is a schematic structural diagram of an exhaust gas recovery experimental system provided by an embodiment of the present invention;

Figure 2 is a flow chart of a method for implementing an exhaust gas recovery experiment provided by an embodiment of the present invention.

Reference signs

101-Experimental cavity

1011-Vacuum gauge unit

1012-Pressure Gauge Unit

102-Vacuum unit

1021-Mechanical pump

1022-Third electronic valve

1023-Filter

1024-Molecular pump

1025-Fourth electronic valve

1026-Mechanical pump check valve

103-Gas storage and supply unit

1031-Gas storage bottle

1032-First stop valve

1033-Pressure reducing valve

1034-Second stop valve

1035-First solenoid valve

1036-Inflatable one-way valve

1037-First pressure sensor

1038-Second pressure sensor

1039-Safety valve

104-Gas recovery and reuse unit

1041-Boost pump

1042-Stabilizer bottle

1043-Second electronic valve

1044-Third pressure sensor

105-Exhaust gas recovery unit

1051-Recycling gas cylinders

1052-Four-way switch

1053-Second booster pump

1054-Fourth solenoid valve

1055-Third stop valve

1056-Concentration sensor

1057-Pressure sensor for recycling gas cylinders

1058-Temperature sensor for vacuum unit

1059-Fifth solenoid valve

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

In the embodiment of the present invention, a waste gas recovery unit is added to the set vacuum/pressurization experimental system. The waste gas recovery unit is connected to one end of the vacuum unit of the experimental system, receives the waste gas generated by the experiment and stores it in the set recovery gas bottle. ,

In this way, the embodiment of the present invention realizes the recovery of exhaust gas while providing experimental vacuum/pressurization conditions.

The exhaust gas recovery system provided in the embodiment of the present invention can be applied on the ground or in a satellite platform. Whether applied on a satellite platform or on the ground, exhaust gas can be effectively recovered after pressurization and/or vacuum experiments. The following is a detailed description of how the exhaust gas recovery system used on a satellite platform specifically performs exhaust gas recovery as an example.

Figure 1 is a schematic structural diagram of an exhaust gas recovery experimental system provided by an embodiment of the present invention. The system is installed in a satellite platform and includes: an experimental chamber 101, a vacuum unit 102, a gas storage and supply unit 103, and an exhaust gas recovery unit 105, where,

The gas storage and supply unit 103 is connected to the experimental chamber 101 through the gas inlet, and the gas is input into the experimental chamber 101 through the gas inlet until the pressure of the experimental chamber 101 reaches the set value;

One end of the vacuum unit 102 is connected to the gas outlet of the experimental chamber 101, and the other end is connected to the exhaust gas recovery unit 105. The experimental chamber 101 is evacuated before pressurization. After the pressurization experiment is completed, the exhaust gas is Recycled into the exhaust gas recovery unit 105;

The exhaust gas recovery unit 105 is provided with a recovery gas bottle 1051. The exhaust gas recovery unit 105 is connected to the other end of the vacuum unit 102, receives the exhaust gas input from the vacuum unit 102, and stores it in the recovery gas bottle 1051.

The system also includes a gas recovery and reuse unit 104. The exhaust gas recovery unit 105 also includes a four-way switch 1052. The four-way switch 1052 is respectively connected to the other end of the vacuum unit 102, and the gas recovery and reuse unit 104. The other end is connected; one end of the gas recovery and reuse unit 104 is connected to the gas storage and supply unit 103. By opening and closing the four-way switch 1052, the recovered gas in the experimental chamber 101 is recovered through the vacuum unit 102. After gas recovery and The multiplexing unit 104 is input to the gas storage and supply unit 103 for storage.

In this system, the exhaust gas recovery unit 105 includes: a four-way switch 1052 connected in series to a second boost pump 1053, a fourth solenoid valve 1054, and a recovery gas bottle 1051. The second boost pump 1053 receives exhaust gas input from the vacuum unit 102. When the gas is stored in the recovered gas bottle 1051, the second booster pump 1053 is opened to increase the pressure of the exhaust gas, and the fourth solenoid valve 1054 is opened to allow the pressurized exhaust gas to flow into the recovered gas bottle 1051.

In this system, a third stop valve 1055 is provided between the recycled gas bottle 1051 and the fourth solenoid valve 1054 to block the exhaust gas flowing into the recycled gas bottle 1051.

In this system, the four-way switch 1052 in the exhaust gas recovery unit 105 also includes a concentration sensor 1056 to detect the concentration of the exhaust gas. When the concentration of the exhaust gas reaches the set value, the second booster pump 1053 and the fourth booster pump 1053 are turned off. The solenoid valve 1054 stops the exhaust gas from flowing into the recovery gas cylinder 1051.

Here, the set value can be set as the concentration value of the gas storage bottle 1031 in the gas storage and supply unit 103. When the set value is reached, it proves that the experimental chamber 101 has been cleaned or the excess gas generated by the experiment has been exhausted. If the gas is completely empty, the second boost pump 1053 and the fourth solenoid valve 1054 are closed, so that the remaining gas is compressed back into the gas storage bottle 1031 in the gas storage and supply unit 103 through the gas recovery and reuse unit 104 .

Here, the set value can also be set to 0. When the set value 0 is reached and the vacuum value in the experimental chamber 101 is measured to reach the set initial target vacuum value, it is proved that the gas inside the experimental chamber 101 is compressed to Recycling gas bottles 1051.

In this system, the exhaust gas recovery unit 105 also includes a pressure sensor 1057 of the recovered gas bottle, which is arranged between the third stop valve 1055 and the recovered gas bottle 1051 to monitor the pressure of the recovered gas bottle 1051 .

In this system, the four-way switch 1052 in the exhaust gas recovery unit 105 and the switch at the other end of the opening and closing vacuum unit 102 are also provided with a temperature sensor 1058 of the vacuum unit and a fifth solenoid valve 1059. The temperature sensor 1058 of the vacuum unit monitors the inflow. to the temperature of the exhaust gas in the exhaust gas recovery unit 105. When the temperature reaches the set value, the fifth solenoid valve 1059 is closed to stop the exhaust gas recovery unit 105 from recovering the exhaust gas.

In the embodiment of the present invention, when conducting experiments on a satellite platform or on the ground, in order to avoid cross-contamination between experiments, the experimental cavity 101 needs to be flushed after an experiment is completed, and the flushed exhaust gas is uniformly recycled. This is where the exhaust gas recovery unit 105 is provided.

The system provided by the embodiment of the present invention can provide all types of experimental chambers in vacuum/pressurized environments, and is compatible with the recovery and processing of toxic and polluted exhaust gases generated during the experiment, and can independently complete the cleaning and processing of the experimental chambers. At the same time, the exhaust gas recovery of the experiment also provides convenience and basis for scientific experimental work such as later analysis of gas components generated in the experiment.

In the embodiment of the present invention, when the system adopts the exhaust gas recovery mode, it is mainly suitable for the following experiments:

1) Generating excess or contaminated gas during the experiment;

2) The experimental cavity is contaminated during the experiment, and the experimental container needs to be cleaned after the experiment is completed;

3) The gas generated during the experiment needs to be collected, and scientific analysis and research experiments need to be carried out later.

The system provided by the embodiments of the present invention greatly expands the range of experiments available on the satellite platform or on the ground, while reducing dependence on the external environment. After completing the pressure experiment in conventional experiments on satellite platforms or on the ground, the gas recovery and reuse unit is used to directly recover the recovered gas into the gas storage and supply unit to complete the recovery and reuse of the recovered gas. For special experiments, after the vacuum or pressure experiment is completed, an exhaust gas recovery unit needs to be used to recover different experimental exhaust gases.

In this system, the gas storage and supply unit 103 is composed of a charging check valve 1036, a gas storage bottle 1031, a first stop valve 1032, a pressure reducing valve 1033, a second stop valve 1034, and a first solenoid valve 1035 in series, where ,

When pressurizing the experimental chamber 101, close the inflation check valve 1036, and open the first stop valve 1032, the pressure reducing valve 1033, the second stop valve 1034, and the first solenoid valve 1035 in sequence, so that the gas in the gas cylinder 1031 The gas is input into the experimental chamber 101 through the gas inlet. Until the pressure of the experimental chamber 101 reaches the set value, the first stop valve 1032, the pressure reducing valve 1033, the second stop valve 1034, and the first solenoid valve 1035 are closed in sequence;

When the gas in the experimental chamber 101 is discharged, the inflation check valve 1036 is opened, the first stop valve 1032, the pressure reducing valve 1033, the second stop valve 1034, and the first solenoid valve 1035 are closed in sequence, and the gas recovery and reuse unit 104 The gas recovered from the experimental chamber 101 is input into the gas storage bottle 1031 through the charging one-way valve 1036.

The gas in the gas storage bottle 1031 can be various types of gas for pressure testing in the experimental chamber 101, such as argon.

A first pressure sensor 1037 is placed between the gas storage bottle 1031 and the first stop valve 1032 to detect the pressure of the gas storage bottle 1031. When the pressure is high, the pressure reducing valve 1033 is opened; between the first stop valve 1032 and the second A second pressure sensor 1038 is placed between the stop valves 1033 to detect the gas pressure transmitted in the air channel in the gas storage and supply unit 103. A temperature sensor can also be placed at the position of the second pressure sensor 1038 for monitoring the gas. The gas temperature in the air passage in the storage and supply unit 103 is detected.

A safety valve 1039 is disposed between the first solenoid valve 1035 and the gas inlet for closing when the gas transmitted in the air channel in the gas storage and supply unit 103 is unsafe. A solenoid valve is also provided at the safety valve 1039 for controlling the opening and closing of the safety valve 1039.

In this system, the gas recovery and reuse unit 104 is composed of a boost pump 1041, a pressure stabilizing bottle 1042, and a second electronic valve 1043 connected in series, wherein,

When the gas in the experimental chamber 101 is discharged, the second electronic valve 1043 is opened and the boost pump 1041 is started. The gas recovered from the experimental chamber 101 passes through the gas outlet, passes through the pressure stabilizing bottle 1042 and the boost pump 1041 in sequence, and then is transmitted to the gas In the storage and supply unit 103;

When the experimental chamber 101 is pressurized or the exhaust gas is recovered by the exhaust gas recovery unit 105, the second electronic valve 1043 is closed.

The gas recovery and reuse unit 104 also includes a third pressure sensor 1044 located between the boost pump 1041 and the pressure stabilizing bottle 1042 to monitor the pressure between the boost pump 1041 and the pressure stabilizing bottle 1042 .

A pressure sensor and a temperature sensor are also included between the boost pump 1041 and the charging check valve 1036 in the gas recovery and reuse unit 104 for detecting the pressure and temperature of the boost pump 1041.

In this system, vacuum unit 102 includes:

The mechanical pump 1021, the third electronic valve 1022, the filter 1023 and the molecular pump 1024 are connected in series and then connected to the gas outlet;

When a first-level vacuum is formed in the experimental chamber 101, the third electronic valve 1022 is opened and the mechanical pump 1021 is started. Under the action of the mechanical pump 1021, the air molecules in the experimental chamber 101 pass through the gas outlet and the molecular pump 1024. After filtration by the filter 1023, it is extracted into the mechanical pump 1021 through the third electronic valve 1022. After the experimental chamber 101 reaches the starting pressure of the molecular pump 1024, the molecular pump 1024 is started to continue to extract air molecules in the experimental chamber 101. , to achieve a high vacuum environment for the experimental cavity 101.

In the vacuum unit 102, the first-level vacuum environment is actually a low vacuum environment.

The vacuum unit 102 also includes a fourth electronic valve 1025. One end of the fourth electronic valve 1025 is connected between the third electronic valve 1022 and the filter 1023, and the other end is connected to the mechanical pump provided in the mechanical pump 1021. On the one-way valve 1026, when the experimental chamber 101 is evacuated, the fourth electronic valve 1025 is closed.

When the experimental chamber 101 is pressurized, the fourth electronic valve 1025, the third electronic valve 1022, the mechanical pump 1021 and the molecular pump 1024 are closed.

When the pressurized gas is discharged from the experimental chamber 101, the fourth electronic valve 1025 is opened until the pressure in the experimental chamber reaches the pressure set by the boost pump 1041, then the third electronic valve 1022 is opened, the mechanical pump 1021 is started, and then closed The fourth electronic valve 1025, until the pressure of the experimental chamber reaches the starting pressure of the molecular pump 1024, opens the molecular pump 1024 and continues to exhaust gas into the gas recovery and reuse unit 104 or the exhaust gas recovery unit 105.

In this system, the molecular pump 1024 actually controls the directional flow of air molecules in the experimental chamber 101, so that the air molecules continue to be discharged from the experimental chamber 101.

In this system, the experimental chamber 101 is also connected to the vacuum gauge unit 1011, which monitors the vacuum environment of the experimental chamber 101 to obtain the vacuum value and displays it.

In this system, the experimental chamber 101 is also connected to the pressure gauge unit 1012, and the pressure of the experimental chamber 101 is monitored to obtain the pressure value and displayed.

In this system, the function of the filter 1023 is to filter impurities in air molecules extracted from the experimental chamber 101 to avoid damage to the mechanical pump 1021.

Figure 2 is a flow chart of a method for implementing a pressurization experiment provided by an embodiment of the present invention. The specific steps are:

Step 201: Set up the experimental chamber, vacuum unit, gas storage and supply unit, and exhaust gas recovery unit;

Step 202: The gas storage and supply unit is connected to the experimental chamber through the gas inlet, and the gas is input into the experimental chamber through the gas inlet until the pressure of the experimental chamber reaches the set value;

Step 203. One end of the vacuum unit is connected to the gas outlet of the experimental cavity, and the other end is connected to the exhaust gas recovery unit. The experimental cavity is evacuated before pressurization. After the pressurization experiment is completed, the exhaust gas is recovered. to the exhaust gas recovery unit;

Step 204: The exhaust gas recovery unit is provided with a recovery gas bottle. The exhaust gas recovery unit is connected to the other end of the vacuum unit, and the exhaust gas received from the vacuum unit is stored in the recovery gas bottle.

In this method, it also includes: setting up a gas recovery and reuse unit, one end of the gas recovery and reuse unit is connected to the vacuum unit, and the other end is connected to the gas storage and supply unit;

The recovered gas in the experimental cavity is recovered through the vacuum unit, and is input to the gas storage and supply unit for storage through the gas recovery and reuse unit.

This method also includes:

The exhaust gas recovery unit monitors whether the gas concentration of the input exhaust gas reaches the set value, and if so, stops inputting the exhaust gas.

The set value is the concentration value of the gas storage bottle in the gas storage and supply unit, or when the set value is 0 and the vacuum value in the experimental chamber is measured to reach the set initial target vacuum value.

In this method, the vacuum unit is also equipped with a filter to filter air molecules discharged through the airway between the experimental chamber and the mechanical pump.

In this method, real-time pressure monitoring and vacuum monitoring of the experimental chamber are also performed.

The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the present invention. within the scope of protection.

Claims (8)

1. An exhaust gas recovery device, characterized in that it is used to complete experiments on a satellite platform, including: an experimental chamber (101), a vacuum unit (102), a gas storage and supply unit (103), and an exhaust gas recovery unit ( 105), among which, The gas storage and supply unit (103) is connected to the experimental chamber (101) through the gas inlet, and the gas is input into the experimental chamber through the gas inlet until the pressure of the experimental chamber reaches the set value; One end of the vacuum unit (102) is connected to the gas outlet of the experimental cavity (101), and the other end is connected to the exhaust gas recovery unit (105). The experimental cavity (101) is evacuated before pressurization. After the pressure test is completed, the exhaust gas is recovered into the exhaust gas recovery unit (105); The exhaust gas recovery unit (105) is provided with a recovery gas bottle (1051). The exhaust gas recovery unit (105) is connected to the other end of the vacuum unit (102), and receives the exhaust gas input from the vacuum unit (102) and stores it in the recovery gas bottle (1051). 1051); It also includes: a gas recovery and reuse unit (104). The exhaust gas recovery unit (105) also includes a four-way switch (1052), wherein, The four-way switch (1052) is connected to the other end of the vacuum unit (102) and the other end of the gas recovery and reuse unit (104) respectively; One end of the gas recovery and reuse unit (104) is connected to the gas storage and supply unit (103), and through the opening and closing of the four-way switch (1052), the gas recovered in the experimental cavity (101) is recovered through the vacuum unit (102). The gas is input to the gas storage and supply unit (103) for storage through the gas recovery and reuse unit (104); The vacuum unit (102) includes: The mechanical pump (1021), the third electronic valve (1022), the filter (1023) and the molecular pump (1024) are connected in series and then connected to the gas outlet; When forming a first-level vacuum in the experimental cavity (101), which is a low vacuum environment, the third electronic valve (1022) is opened, the mechanical pump (1021) is started, and the air molecules in the experimental cavity (101) Under the action of the mechanical pump (1021), after passing through the gas outlet and the molecular pump (1024), after being filtered by the filter (1023), it is pumped into the mechanical pump (1021) through the third electronic valve (1022) until After the experimental chamber (101) reaches the starting pressure of the molecular pump (1024), start the molecular pump (1024) and continue to extract air molecules in the experimental chamber (101) to achieve a high vacuum environment for the experimental chamber (101); The vacuum unit (102) also includes a fourth electronic valve (1025). One end of the fourth electronic valve (1025) is connected between the third electronic valve (1022) and the filter (1023), and the other end of the fourth electronic valve (1025) It is connected to the mechanical pump check valve (1026) provided in the mechanical pump (1021). When the experimental chamber (101) is evacuated, the fourth electronic valve (1025) is closed. 2. The device according to claim 1, characterized in that the exhaust gas recovery unit (105) includes: a four-way switch (1052) connected in series to a second boost pump (1053) and a fourth solenoid valve (1054). and the recovery gas bottle (1051). When the second booster pump (1053) receives the exhaust gas input from the vacuum unit (102) and stores it in the recovery gas bottle (1051), the second booster pump (1053) opens to allow the exhaust gas to The gas is pressurized, and the fourth solenoid valve (1054) is opened to allow the pressurized exhaust gas to flow into the recovery gas bottle (1051). 3. The device according to claim 2, characterized in that a third stop valve (1055) is also provided between the recycled gas bottle (1051) and the fourth solenoid valve (1054). ) to cut off the inflow of exhaust gas. 4. The device according to claim 2, characterized in that the four-way switch (1052) in the exhaust gas recovery unit (105) also has a concentration sensor (1056) to detect the concentration of the exhaust gas. When the concentration reaches the set value, the second booster pump (1053) and the fourth solenoid valve (1054) are closed to stop the flow of exhaust gas into the recovery gas bottle (1051). 5. The device according to claim 2, wherein the exhaust gas recovery unit (105) further includes a pressure sensor (1057) of the recovered gas bottle, which is disposed between the third stop valve (1055) and the recovered gas bottle (1051). ), monitor the pressure of the recovery gas cylinder (1051). 6. The device according to claim 2, characterized in that the one-way switch at the other end of the opening and closing vacuum unit (102) of the four-way switch (1052) in the exhaust gas recovery unit (105) is also provided with a vacuum unit ( The temperature sensor (1058) and the fifth solenoid valve (1059) of 102), the temperature sensor (1058) of the vacuum unit (102) monitors the temperature of the exhaust gas flowing into the exhaust gas recovery unit (105), when the temperature reaches the set value , close the fifth solenoid valve (1059), and stop the waste gas recovery unit (105) from recovering waste gas. 7. A method for realizing waste gas recovery, characterized in that it is used to complete experiments on a satellite platform. The method includes: Set up experimental chamber, vacuum unit, gas storage and supply unit, and exhaust gas recovery unit; The gas storage and supply unit is connected to the experimental chamber through the gas inlet, and the gas is input into the experimental chamber through the gas inlet until the pressure of the experimental chamber reaches the set value; One end of the vacuum unit is connected to the gas outlet of the experimental cavity, and the other end is connected to the exhaust gas recovery unit. The experimental cavity is evacuated before pressurization. After the pressurization experiment is completed, the exhaust gas is recovered to the exhaust gas recovery unit. in unit; The waste gas recovery unit is provided with a recovery gas bottle, which is connected to the other end of the vacuum unit, and receives the waste gas input from the vacuum unit and stores it in the recovery gas bottle; The method also includes: Set up a gas recovery and reuse unit, one end of the gas recovery and reuse unit is connected to the vacuum unit, and the other end is connected to the gas storage and supply unit; The recovered gas in the experimental cavity is recovered through the vacuum unit, and is input to the gas storage and supply unit for storage through the gas recovery and reuse unit; The vacuum unit of the method includes: The mechanical pump (1021), the third electronic valve (1022), the filter (1023) and the molecular pump (1024) are connected in series and then connected to the gas outlet; When forming a first-level vacuum in the experimental cavity (101), which is a low vacuum environment, the third electronic valve (1022) is opened, the mechanical pump (1021) is started, and the air molecules in the experimental cavity (101) Under the action of the mechanical pump (1021), after passing through the gas outlet and the molecular pump (1024), after being filtered by the filter (1023), it is pumped into the mechanical pump (1021) through the third electronic valve (1022) until After the experimental chamber (101) reaches the starting pressure of the molecular pump (1024), start the molecular pump (1024) and continue to extract air molecules in the experimental chamber (101) to achieve a high vacuum environment for the experimental chamber (101); The vacuum unit (102) also includes a fourth electronic valve (1025). One end of the fourth electronic valve (1025) is connected between the third electronic valve (1022) and the filter (1023), and the other end of the fourth electronic valve (1025) It is connected to the mechanical pump check valve (1026) provided in the mechanical pump (1021). When the experimental chamber (101) is evacuated, the fourth electronic valve (1025) is closed. 8. The method of claim 7, further comprising: The exhaust gas recovery unit monitors whether the gas concentration of the input exhaust gas reaches the set value, and if so, stops inputting the exhaust gas; The set value is the concentration value of the gas storage bottle in the gas storage and supply unit, or when the set value is 0 and the vacuum value in the experimental chamber is measured to reach the set initial target vacuum value.