A xenon gas recovery device for electric propulsion ground test propellant

Abstract

The present application relates to the field of electric propulsion technology, and more specifically, to a device for recovering xenon gas, a propellant working medium for ground test of electric propulsion, comprising a cabin exhaust unit, a low-pressure transition unit, a mechanical supercharger unit, a high-pressure storage unit, a purity detection unit, and an automated control unit, wherein: one end of the cabin exhaust unit is connected to the test cabin, and the other end is connected to the low-pressure transition unit through a valve and a main pipeline; the mechanical supercharger unit is composed of a pneumatic booster pump and a driving air source screw unit; the purity detection unit is arranged inside the mechanical supercharger unit; the automated control unit is electrically connected to the cabin exhaust unit, the low-pressure transition unit, the mechanical supercharger unit, the high-pressure storage unit, and the purity detection unit, respectively. The present application realizes the recovery and utilization of xenon gas, a propellant working medium, and realizes the filtration, purification, and purity monitoring of xenon gas through a two-stage filter and an online purity detection unit, so that the purity of the recovered xenon gas is better than 90%.

Description

Technical Field

[0001] The present application relates to the field of electric propulsion technology, and in particular to a xenon gas recovery device for electric propulsion ground test propellant. Background Art

[0002] Since electric propulsion technology can effectively reduce the amount of propellant carried by satellites or spacecraft, thereby significantly reducing the launch mass, it has been widely used in orbit. Current ion and Hall electric propulsion systems both use xenon as the main working medium, and are used in large quantities in ground tests and actual missions. The content of xenon in the air is extremely low (about 0.086ppmV / V), and it is an extremely expensive and rare strategic material.

[0003] Xenon gas is usually reduced to xenon again after participating in the ignition and ionization of the electric thruster in the electric propulsion vacuum test chamber and is pumped away by a cryogenic pump. The cryogenic pump condenses solid xenon on a cold plate by cooling the refrigerant (40~60K). After the test, it is desorbed into gaseous xenon by returning to the temperature after warming up and then released into the vacuum chamber (generally in the range of tens of Pa to hundreds of Pa). The entire process takes place in the vacuum chamber and the xenon gas is not pumped out. Therefore, the xenon gas introduced into the chamber still exists in the chamber after the test and has little exchange with the outside world. Its recovery value is relatively high. Therefore, it is necessary to study xenon recovery technology, that is, to collect and compress the xenon gas in the chamber as completely as possible into gas cylinders without introducing secondary pollution, so that it can be used for the next step of purification. Summary of the invention

[0004] The present application provides a xenon gas recovery device for electric propulsion ground test propellant working fluid, which achieves the effect of pressurizing and recovering xenon gas in an electric propulsion vacuum cabin and preliminary purification, and the purity of the recovered xenon gas is better than 90%.

[0005] In order to achieve the above-mentioned purpose, the present application provides a xenon gas recovery device for an electric propulsion ground test propellant, comprising a cabin air extraction unit, a low-pressure transition unit, a mechanical booster unit, a high-pressure storage unit, a purity detection unit and an automatic control unit, wherein: one end of the cabin air extraction unit is connected to the test cabin, and the other end is connected to the low-pressure transition unit through a valve and a main line; the mechanical booster unit is composed of a pneumatic booster pump and a driving air source screw unit, one end of the pneumatic booster pump is connected to the low-pressure transition unit through a valve and a main line, and the other end is connected to the high-pressure storage unit through a valve and a main line; the driving air source screw unit is connected to the pneumatic booster pump for inputting an air source into the pneumatic booster pump; the purity detection unit is arranged inside the mechanical booster unit; the automatic control unit is electrically connected to the cabin air extraction unit, the low-pressure transition unit, the mechanical booster unit, the high-pressure storage unit and the purity detection unit, respectively, for automatic control of each unit.

[0006] Furthermore, the cabin exhaust unit is a Roots pump or a vortex pump, which is connected to the test cabin and is used to extract the xenon gas inside the test cabin and transmit it to the low-pressure transition unit.

[0007] Furthermore, the low-pressure transition unit includes a cryogenic cold trap, a first filter and an airbag, wherein: the cryogenic cold trap and the first filter are sequentially arranged on the main pipe between the cabin exhaust unit and the airbag; the airbag is made of a composite rubber material and is fixed to a mobile trolley by a support rod; a pressure gauge connected to the outside of the airbag has a metal weight on the top.

[0008] Furthermore, the mechanical booster unit also includes a vacuum pump, a pressure sensor and a control system, wherein: the vacuum pump is connected to the main line through a vacuum extraction pipeline; the pressure sensor is arranged on the main lines on both sides of the pneumatic booster pump; the pneumatic booster pump, the driving air source screw unit, the vacuum pump and the pressure sensor as a whole constitute a silent frame box; wheels are arranged at the bottom of the box, and the control system is arranged on the surface of the box.

[0009] Furthermore, a purifier and a second filter are provided on the main pipe between the pneumatic booster pump and the high-pressure storage unit.

[0010] Furthermore, the high-pressure storage unit is composed of high-pressure gas cylinders, which are divided into two specifications of 10L and 40L, and the pressure resistance of both is 15MPa.

[0011] Furthermore, the purity detection unit includes a xenon concentration detection instrument, an oxygen content analyzer, a water content analyzer and a particulate matter detector, all of which are online detection instruments, which are arranged inside the casing of the mechanical supercharging unit, and are connected to the main line between the pneumatic booster pump and the high-pressure storage unit through a detection branch line, and are used for real-time feedback of gas concentration and impurity content.

[0012] Furthermore, the automation control unit is arranged inside the control cabinet, and is used to control each unit and each valve on the pipeline, and can monitor and display the data collected by the purity detection unit.

[0013] Furthermore, the pneumatic booster pump is divided into a fully automatic control mode and a manual control mode; the vacuum pump is divided into a semi-automatic control mode and a manual control mode.

[0014] The invention provides a xenon gas recovery device for electric propulsion ground test propellant, which has the following beneficial effects:

[0015] The present application realizes the recycling of the propellant working fluid xenon gas by setting up a low-pressure transition unit and a mechanical supercharging unit, and realizes the filtration, purification and purity monitoring of the xenon gas through a two-stage filter and an online purity detection unit, so that the purity of the recovered xenon gas is better than 90%, solving the current problems of shortage of xenon gas resources in my country and the continuous rise in prices. The recovered xenon gas will be purified and utilized subsequently, which can provide a long-term, stable and reliable source of xenon gas for the electric propulsion system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The schematic embodiment drawings and their descriptions of this application are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0017] Figure 1 is a schematic diagram of a xenon gas recovery device for electric propulsion ground test propellant according to an embodiment of the present application;

[0018] Figure 2 It is a connection diagram of a low-pressure transition unit of a xenon gas recovery device for an electric propulsion ground test propellant provided in an embodiment of the present application;

[0019] Figure 3 It is a connection diagram of a mechanical booster unit and a purity detection unit of a xenon gas recovery device for an electric propulsion ground test propellant provided in an embodiment of the present application;

[0020] Figure 4 It is a connection schematic diagram of a high-pressure storage unit of a xenon gas recovery device for an electric propulsion ground test propellant provided in an embodiment of the present application;

[0021] In the figure: 1- low temperature cold trap, 2- first filter, 3- air bag, 4- pneumatic booster pump, 5- driving air source screw, 6- vacuum pump, 7- pressure sensor, 8- purifier, 9- second filter, 10- purity detection unit, 11- pressure reducing valve, 12- control system, 13- high pressure gas cylinder, P1- positive and negative pressure sensors, P2- vacuum pressure sensor, P3, P4- high pressure pressure sensors, P5- digital pressure gauge. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0023] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0024] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0025] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0026] In addition, the term "plurality" shall mean two or more.

[0027] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0028] like Figure 1As shown, the present application provides a xenon gas recovery device for an electric propulsion ground test propellant, including a cabin air extraction unit, a low-pressure transition unit, a mechanical booster unit, a high-pressure storage unit, a purity detection unit 10 and an automatic control unit, wherein: one end of the cabin air extraction unit is connected to the test cabin, and the other end is connected to the low-pressure transition unit through a valve and a main line; the mechanical booster unit is composed of a pneumatic booster pump 4 and a driving air source screw 5 unit, one end of the pneumatic booster pump 4 is connected to the low-pressure transition unit through a valve and a main line, and the other end is connected to the high-pressure storage unit through a valve and a main line; the driving air source screw 5 unit is connected to the pneumatic booster pump 4, for inputting air source into the pneumatic booster pump 4; the purity detection unit 10 is arranged inside the mechanical booster unit; the automatic control unit is electrically connected to the cabin air extraction unit, the low-pressure transition unit, the mechanical booster unit, the high-pressure storage unit and the purity detection unit 10, respectively, for automatic control of each unit.

[0029] Specifically, the electric propulsion ground test propellant working fluid xenon gas recovery device provided in the embodiment of the present application is mainly used to extract and recover the working fluid xenon gas inside the test cabin at the electric propulsion test site, and in the process of extraction and recovery, the xenon gas is filtered and purified so that the xenon gas can be recycled. Among them, after the ground test, there will be a mixture of xenon and air in the test cabin at the hectopascal level, generally referred to as crude xenon, and the cabin exhaust unit will extract the gas in the test cabin to 0.1-0.12MPa (absolute pressure); the extracted crude xenon will enter the low-pressure transition unit, which is used on the one hand to perform preliminary filtration on the crude xenon to remove water, oil and particulate matter, and on the other hand to store low-pressure (<10KPa) crude xenon; the storage pressure range of xenon gas is generally 0.3-10MPa, and the mechanical booster unit and the low-pressure transition unit are connected, mainly used to transfer the low-pressure The crude xenon is extracted and pressurized, and at the same time, the crude xenon is finely filtered to improve its purity, and then transported to the high-pressure storage unit for storage, and the maximum storage pressure can reach 10MPa; the high-pressure storage unit is mainly used to store purified high-purity and high-pressure xenon gas, which can be subsequently connected to the electric propulsion gas supply device to realize the recovery and recycling of xenon gas; the purity detection unit 10 is mainly used to perform real-time detection of the purity and state of xenon gas during the xenon gas transportation process; the automatic control unit is mainly used to automatically control each unit and all pipe valves, so as to realize the high-purity recovery of xenon gas.

[0030] Furthermore, the cabin exhaust unit is a Roots pump or a vortex pump, which is connected to the test cabin and is used to extract the xenon gas inside the test cabin and transmit it to the low-pressure transition unit. In the embodiment of the present application, the air pressure in the test cabin is lower than the atmospheric pressure, and preferably a Roots pump or a vortex pump is used to exhaust the air in the test cabin.

[0031] Further, such as Figure 2As shown, the low-pressure transition unit includes a cryogenic cold trap 1, a first filter 2 and an airbag 3, wherein: the cryogenic cold trap 1 and the first filter 2 are sequentially arranged on the main pipe between the cabin exhaust unit and the airbag 3; the airbag 3 is made of a composite rubber material and fixed on a mobile trolley through a support rod; the pressure gauge connected to the outside of the airbag 3 has a metal weight on the top. The cryogenic cold trap 1 is mainly used to remove water and oil from the xenon gas, and the first filter 2 is mainly used to remove particulate matter from the xenon gas. The cryogenic cold trap 1 and the first filter 2 together form a primary filtration to achieve coarse filtration of the xenon gas. The airbag 3 is mainly used to store low-pressure xenon gas, and preferably uses a special composite rubber material. It is in a collapsed state under initial conditions and will quickly inflate when xenon gas enters. When xenon gas is collected through the airbag 3, the main pipeline in front of the airbag 3 should be kept in a vacuum state to meet the vacuum requirements; in addition, multiple airbags 3 can be set for switchable use, and the airbag 3 is fixed on the mobile trolley as a whole through a support rod, and can be moved to any position, so as to facilitate the docking of the airbag 3 with the cabin exhaust unit; the outside of the airbag 3 is connected with a digital pressure gauge P5 for monitoring the pressure inside the airbag 3, and a metal weight is set on the top to provide a certain pressure.

[0032] Further, such as Figure 3As shown, the mechanical booster unit also includes a vacuum pump 6, a pressure sensor 7 and a control system 12, wherein: the vacuum pump 6 is connected to the main pipeline through a vacuum extraction pipeline; the pressure sensor 7 is arranged on the main pipelines on both sides of the pneumatic booster pump 4; the pneumatic booster pump 4, the driving air source screw 5 unit, the vacuum pump 6 and the pressure sensor 7 constitute a silent frame box as a whole; wheels are arranged at the bottom of the box, and the control system 12 is arranged on the surface of the box. The mechanical booster unit mainly extracts and pressurizes the low-pressure xenon gas mixture stored in the airbag 3 through the pneumatic booster pump 4, and finally stores it in the high-pressure storage unit; the pneumatic booster pump 4 is connected to the driving air source screw 5 unit, and can only be started after the driving air source screw 5 unit inputs the air source, and the higher the flow rate and pressure of the driving air source, the greater the compression flow rate of the pneumatic booster pump 4, and the higher the output storage pressure; the vacuum pump 6 is mainly used to evacuate the main pipeline of the device so that it can meet the vacuum use conditions. According to actual conditions, a vacuum pressure sensor P2 can be set on the pipeline connected to it; the pressure sensor 7 is respectively arranged on the main pipeline between the pneumatic booster pump 4 and the low-pressure transition unit and the high-pressure storage unit. It is used to monitor the pressure of xenon gas. Positive and negative pressure sensors P1 and high-pressure pressure sensors P3 and P4 can be set according to actual conditions. In order to facilitate the extraction of the entire gas, the mechanical booster unit is a box structure as a whole. The pneumatic booster pump 4, the driving air source screw 5 unit, the vacuum pump 6, the pressure sensor 7 and the corresponding pipe valve parts are all integrated inside the box. The pneumatic booster pump 4, the vacuum pump 6 and the pipelines between each device are made of stainless steel 316L polished pipes inside and outside, which can reduce pollution. Wheels are set at the bottom of the box to facilitate short-distance mobile docking. The control system 12 is connected to the automatic control unit and is set on the surface of the box to receive instructions from the automatic control unit or manual control instructions.

[0033] Furthermore, a purifier 8 and a second filter 9 are provided on the main pipe between the pneumatic booster pump 4 and the high-pressure storage unit. The purifier 8 and the second filter 9 together form a two-stage filtration, realizing the fine filtration of the xenon gas. The high-pressure xenon gas extracted from the pneumatic booster pump 4 will pass through the purifier 8 and the second filter 9 in sequence, further removing water, oil and particulate impurities, and improving the purity of the xenon gas.

[0034] Further, such as Figure 4As shown, the high-pressure storage unit is composed of a high-pressure gas cylinder 13, which is divided into two specifications of 10L and 40L, and the pressure resistance is 15MPa. The filtered and purified high-pressure xenon gas finally enters the high-pressure storage unit for storage, which is convenient for subsequent use. The high-pressure storage unit is preferably composed of two high-pressure gas cylinders 13 with specifications of 10L and 40L, respectively, and the pressure resistance is 15MPa. They need to be baked when used. In order to facilitate the docking of the gas cylinder and the mechanical supercharger unit, the two specifications of gas cylinders are equipped with two specifications of mobile frames, and the frames need to be provided with locking devices to prevent the gas cylinder from falling due to moving back and forth.

[0035] Furthermore, the purity detection unit 10 includes a xenon gas concentration detection instrument, an oxygen content analyzer, a water content analyzer, and a particle detector, all of which are online detection instruments, arranged inside the box of the mechanical supercharger unit, and connected to the main line between the pneumatic booster pump 4 and the high-pressure storage unit through a detection branch, and used to feedback the concentration and impurity content of the gas in real time. The purity detection unit 10 is connected to the main line between the pneumatic booster pump 4 and the high-pressure storage unit through a detection branch as a whole, and mainly includes online detection instruments such as a xenon gas concentration detection instrument, an oxygen content analyzer, a water content analyzer, and a particle detector. The specific instrument is selected according to the actual detection situation, and is mainly used to feedback the gas concentration of xenon gas and the content of impurities in real time. A pressure reducing valve 11 is generally provided on the detection branch to prevent damage to the detection instrument due to excessive pressure; the purity detection unit 10 is arranged inside the mechanical supercharger unit, but the display window is generally arranged on the surface of the box, which can display the detection results for easy observation; in addition, the detection results can be transmitted to the automatic control unit for analysis and statistics of the detection results.

[0036] Furthermore, the automation control unit is arranged inside the control cabinet, and is used to control each unit and each valve on the pipeline, and can monitor and display the data collected by the purity detection unit 10. The automation control unit is arranged inside a nearby control cabinet, and can remotely control each unit of the device, such as controlling the opening and closing of the Roots pump or the vortex pump, and through the control of the mechanical booster unit control system 12, the control of the vacuum pump 6, the pneumatic booster pump 4 and the driving air source screw 5 units, as well as the control of each pipeline and valve, can be achieved. At the same time, it can also monitor and display each instrument (pressure gauge, pressure sensor 7, purity detection unit 10, etc.), and control the corresponding unit devices according to the data of the instrument. Among them, in the embodiment of the present application, such as Figure 2-4 As shown, solenoid valves or diaphragm valves are arranged on each connecting pipeline according to actual conditions to control the on-off of each pipeline to realize the flow of xenon gas in the pipeline.

[0037] Further, the pneumatic booster pump 4 is divided into a fully automatic control mode and a manual control mode; the vacuum pump 6 is divided into a semi-automatic control mode and a manual control mode. In the embodiment of the present application, each unit or device of the device can be automatically controlled or manually controlled according to the actual situation. The automatic control is mainly to set the corresponding control instructions through the automatic control unit, and the manual control is to directly operate each unit manually; for example, the pneumatic booster pump 4 is divided into a fully automatic control mode and a manual control mode, and the driving air source screw 5 unit provides a power mode. The automatic control mode is based on the set outlet pressure value, and the real-time collected pressure value is fed back to the automatic control unit, and the automatic control unit calculates and issues a specified command to control the shutdown of the driving air source screw 5 unit, thereby controlling the start and stop of the pneumatic booster pump 4, and the manual control mode is to directly operate the start and stop manually; the vacuum pump 6 is divided into a semi-automatic control mode and a manual control mode. In the semi-automatic control mode, according to the set pipeline pressure value, the real-time collected pressure value is fed back to the automatic control unit, and the automatic control unit calculates and issues a specified command to control the vacuum pump 6 power supply shutdown, thereby controlling the start and stop of the vacuum pump 6, and the manual control mode is to directly operate the start and stop manually.

[0038] Specifically, in the embodiment of the present application, the process of xenon gas recovery is as follows: xenon gas is extracted from the test cabin at the electric propulsion test site through a Roots pump or a vortex pump to provide power, passes through a low-temperature cold trap 1 to remove water and oil, and then passes through a first filter 2 to remove impurities and particulate matter, and then enters the airbag 3. The airbag 3 is inflated from a collapsed state to an expanded state, and then the airbag 3 is moved to a compression recovery chamber by a mobile cart, and the airbag 3 is docked with a mechanical supercharger unit. The xenon gas is extracted and compressed from the airbag 3 by a pneumatic booster pump 4, and then purified and finely filtered by a purifier 8 and a second filter 9. During this period, the purity detection unit 10 connected by the detection branch will detect the concentration of the xenon gas, as well as the content of water, oxygen, and particulate matter, to determine the purity and state of the xenon gas. Finally, the pneumatic booster pump 4 compresses the xenon gas to greater than 5MPa and enters the gas cylinder of the high-pressure storage unit for storage.

[0039] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A xenon gas recovery device for electric propulsion ground test propellant, characterized in that: It includes a cabin air extraction unit, a low-pressure transition unit, a mechanical pressurization unit, a high-pressure storage unit, a purity detection unit and an automatic control unit, wherein: One end of the cabin exhaust unit is connected to the test cabin, and the other end is connected to the low-pressure transition unit through a valve and a main pipe; The mechanical booster unit is composed of a pneumatic booster pump and a driving air source screw unit, one end of the pneumatic booster pump is connected to the low-pressure transition unit through a valve and a main pipe, and the other end is connected to the high-pressure storage unit through a valve and a main pipe; The driving air source screw unit is connected to the pneumatic booster pump and is used to input air source into the pneumatic booster pump; The purity detection unit is arranged inside the mechanical supercharging unit; The automatic control unit is electrically connected to the cabin air extraction unit, the low-pressure transition unit, the mechanical supercharger unit, the high-pressure storage unit and the purity detection unit, respectively, for automatic control of each unit; The cabin exhaust unit is a Roots pump or a vortex pump, which is connected to the test cabin and is used to extract the xenon gas inside the test cabin and transmit it to the low-pressure transition unit; The low-pressure transition unit includes a low-temperature cold trap, a first filter and an air bag, wherein: The low temperature cold trap and the first filter are sequentially arranged on the main pipe between the cabin air extraction unit and the air bag; The airbag is made of composite rubber material and is fixed on the mobile trolley through a support rod; The pressure gauge connected to the outside of the airbag has a metal weight on the top; The mechanical supercharger unit further includes a vacuum pump, a pressure sensor and a control system, wherein: The vacuum pump is connected to the main pipeline via a vacuum pipeline; The pressure sensor is arranged on the main pipes on both sides of the pneumatic booster pump; The pneumatic booster pump, the driving air source screw unit, the vacuum pump and the pressure sensor constitute a silent frame box as a whole; Wheels are arranged at the bottom of the box, and the control system is arranged on the surface of the box; A purifier and a second filter are provided on the main pipe between the pneumatic booster pump and the high-pressure storage unit.

2. The electric propulsion ground test propellant xenon gas recovery device according to claim 1 is characterized in that: The high-pressure storage unit is composed of high-pressure gas cylinders, which are divided into two specifications of 10L and 40L, and the pressure resistance of both is 15MPa.

3. The electric propulsion ground test propellant xenon gas recovery device according to claim 2 is characterized in that: The purity detection unit includes a xenon gas concentration detection instrument, an oxygen content analyzer, a water content analyzer and a particulate matter detector, all of which are online detection instruments, arranged inside the casing of the mechanical supercharging unit, and connected to the main line between the pneumatic booster pump and the high-pressure storage unit through a detection branch, and are used for real-time feedback of gas concentration and impurity content.

4. The electric propulsion ground test propellant xenon gas recovery device according to claim 3 is characterized in that: The automatic control unit is arranged inside the control cabinet, and is used to control each unit and each valve on the pipeline, and can monitor and display the data collected by the purity detection unit.

5. The electric propulsion ground test propellant xenon gas recovery device according to claim 4 is characterized in that: The pneumatic booster pump is divided into a fully automatic control mode and a manual control mode; the vacuum pump is divided into a semi-automatic control mode and a manual control mode.

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