CN114962355B - Controlling a vacuum system comprising a vacuum generator device - Google Patents
Controlling a vacuum system comprising a vacuum generator device Download PDFInfo
- Publication number
- CN114962355B CN114962355B CN202210634573.4A CN202210634573A CN114962355B CN 114962355 B CN114962355 B CN 114962355B CN 202210634573 A CN202210634573 A CN 202210634573A CN 114962355 B CN114962355 B CN 114962355B
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- vacuum
- flowmeter
- gas
- pipe
- vacuum generator
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- 238000005265 energy consumption Methods 0.000 claims abstract description 9
- 239000002699 waste material Substances 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 4
- 229920003023 plastic Polymers 0.000 claims description 4
- 239000004033 plastic Substances 0.000 claims description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/14—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid
- F04F5/16—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid displacing elastic fluids
- F04F5/20—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid displacing elastic fluids for evacuating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
- F04F5/48—Control
- F04F5/52—Control of evacuating pumps
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Jet Pumps And Other Pumps (AREA)
Abstract
The control includes the vacuum system of vacuum generator device, it includes the air inlet that is used for admitting air, still includes filter and PLC controller, filter is installed to one side of air inlet, the vacuum generator is installed to one side of filter, one side of vacuum generator is connected with first high-pressure gas-supply pipe, install first flowmeter on the first high-pressure gas-supply pipe, first high-pressure gas-supply pipe is located one side of first flowmeter and is connected with the gas pitcher through first high-pressure gas-supply pipe, first solenoid valve is installed to one side of gas pitcher bottom, the second solenoid valve is all installed to the both sides that first high-pressure gas-supply pipe is located first flowmeter, the manometer is installed to one side of second solenoid valve, install the vacuum switching valve on the first high-pressure gas-supply pipe of manometer inside, one end of first high-pressure gas-supply pipe is provided with the vacuum output, the novel structure of the invention, the design is ingenious, be convenient for rationally use the gas that produces the vacuum generator, avoid producing unnecessary vacuum gas, reduce the energy consumption.
Description
Technical Field
The present invention relates to vacuum systems, and in particular to controlling vacuum systems comprising a vacuum generator device.
Background
The vacuum generator is a novel, efficient, clean, economical and small-sized vacuum component for generating negative pressure by utilizing a positive pressure air source, so that the negative pressure can be obtained easily and conveniently at a place where compressed air exists or a place where positive and negative pressures are simultaneously needed in a pneumatic system. Vacuum generators are widely used in industrial automation in the fields of machinery, electronics, packaging, printing, plastics, robots, etc.
When the existing vacuum system comprising the vacuum generator device is used, the vacuum gas generated by the vacuum generator cannot be fully utilized, so that energy is wasted, the control performance of the system is poor, and the energy consumption is not reduced.
Disclosure of Invention
Aiming at the situation, in order to overcome the defects of the prior art, the invention provides the vacuum system comprising the vacuum generator device, and the problems that the energy waste is caused by the fact that the vacuum gas generated by the vacuum generator cannot be fully utilized when the existing vacuum system comprising the vacuum generator device is used, and the control performance of the system is poor, so that the energy consumption is not reduced are effectively solved.
In order to achieve the above purpose, the present invention provides the following technical solutions: the invention comprises an air inlet for air intake, a filter, a vacuum generator, a first high-pressure air delivery pipe, a first flowmeter, an air tank, an air intake end, a first electromagnetic valve, a one-way valve, a second electromagnetic valve, a pressure gauge, a vacuum switching valve, a second flowmeter, a vacuum output end, a second high-pressure air delivery pipe and a PLC controller.
According to the technical scheme: the top of the air tank is provided with an air inlet end.
According to the technical scheme: a one-way valve is arranged on the first high-pressure gas pipe at the top end of the gas tank.
According to the technical scheme: the first flowmeter and the second flowmeter are respectively and electrically connected with the input end of the PLC, and the output end of the PLC is respectively and electrically connected with the first electromagnetic valve and the second electromagnetic valve.
According to the technical scheme: the pressure monitor is arranged in the gas tank.
According to the technical scheme: the first high-pressure gas pipe and the second high-pressure gas pipe are both made of high-temperature-resistant plastic.
Controlling a vacuum system comprising a vacuum generator device, comprising the steps of
1) The method comprises the steps that air flow at the position of an air outlet of a vacuum generator is collected through a first flowmeter, air flow at the position of an air outlet of the vacuum generator is collected through a second flowmeter, collected signals are transmitted to an input end of a PLC (programmable logic controller) to be processed through the PLC by the first flowmeter and the second flowmeter;
2) If the flow signal of the first flowmeter is larger than that of the second flowmeter, the output end of the PLC controller sends a command to close a second electromagnetic valve on the first high-pressure gas transmission pipe, the second electromagnetic valve on a branch pipe of the first high-pressure gas transmission pipe at the top end of the gas tank is opened, the first electromagnetic valve is opened, gas is supplied through the gas tank, and redundant vacuum gas generated by the vacuum generator is stored in the gas tank, so that energy waste of the vacuum generator can be reduced;
3) If the flow signal of the first flowmeter is smaller than the demand flow signal of the second flowmeter, the output end of the PLC controller can send an instruction to the vacuum generator, the working power of the vacuum generator is improved, the second electromagnetic valve on the first high-pressure gas pipe is opened, the second electromagnetic valve on the branch pipe of the first high-pressure gas pipe at the top end of the gas tank is closed, intelligent control is facilitated, and the vacuum generator is prevented from generating ineffective energy consumption.
The beneficial effects are that: when the intelligent air purifier is used, air enters through the air inlet, the air entering is filtered by the filter, the filtered air is processed by the vacuum generator to generate vacuum air, the vacuum air generated by the vacuum generator is conveyed to the vacuum output end through the first high-pressure air conveying pipe for use by using equipment, the air flow at the position of the air outlet of the vacuum generator is collected through the installed first flowmeter, the installed second flowmeter collects the air flow at the position of the vacuum output end, the first flowmeter and the second flowmeter transmit collected signals to the input end of the installed PLC controller and are processed through the PLC controller, if the flow signals of the first flowmeter are larger than those of the second flowmeter, the output end of the PLC controller can send instructions to the second electromagnetic valve on the first high-pressure air conveying pipe to be closed, the second electromagnetic valve on the first high-pressure air conveying pipe on the top end of the air tank is opened, the first electromagnetic valve is opened, accordingly, air is supplied through the air tank, redundant vacuum air generated by the vacuum generator is stored in the air tank, energy waste of the vacuum generator can be reduced, if the flow signals of the second flowmeter are smaller than the required flow signals of the second flowmeter, the output signals of the first flowmeter are controlled to send instructions to the second electromagnetic valve on the first high-pressure air conveying pipe to the first electromagnetic valve on the first high-pressure air conveying pipe, and the second electromagnetic valve on the top of the first electromagnetic valve on the high-pressure air conveying pipe is not needed to be opened, and the first electromagnetic valve on the high-pressure electromagnetic valve on the top of the high-pressure controller is conveniently.
The invention has novel structure and ingenious conception, is convenient for reasonably using the gas generated by the vacuum generator, avoids generating redundant vacuum gas and reduces energy consumption.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the accompanying drawings
Fig. 1 is a schematic diagram of the overall structure of the present invention.
Fig. 2 is a flow chart of the present invention.
Reference numerals in the drawings: 1. an air inlet; 2. a filter; 3. a vacuum generator; 4. a first high pressure gas line; 5. a first flowmeter; 6. a gas tank; 7. an air inlet end; 8. a first electromagnetic valve; 9. a one-way valve; 10. a second electromagnetic valve; 11. a pressure gauge; 12. a vacuum switching valve; 13. a second flowmeter; 14. a vacuum output end; 15. a second high pressure gas line; 16. and a PLC controller.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to FIGS. 1-2.
In a first embodiment, as shown in fig. 1-2, the invention provides a vacuum system for controlling a device comprising a vacuum generator, comprising an air inlet 1 for air intake, a filter 2, a vacuum generator 3, a first high-pressure air pipe 4, a first flowmeter 5, an air tank 6, an air inlet end 7, a first electromagnetic valve 8, a one-way valve 9, a second electromagnetic valve 10, a pressure gauge 11, a vacuum switching valve 12, a second flowmeter 13, a vacuum output end 14, a second high-pressure air pipe 15 and a PLC (programmable logic controller) 16, wherein the filter 2 is arranged on one side of the air inlet 1, the vacuum generator 3 is arranged on one side of the filter 2, the first high-pressure air pipe 4 is connected on one side of the vacuum generator 3, the first flowmeter 5 is arranged on the first high-pressure air pipe 4, a branch pipe of the first high-pressure air pipe 4 positioned on one side of the first flowmeter 5 is connected with the air tank 6 through the air inlet end 7, a first electromagnetic valve 8 is arranged on one side of the bottom end of the gas tank 6, a second electromagnetic valve 10 is arranged behind the connection end point of the first high-pressure gas pipe 4 and the branch pipe of the first high-pressure gas pipe 4, a one-way valve 9 is arranged on the branch pipe of the first high-pressure gas pipe 4 at the top end of the gas tank 6, another second electromagnetic valve 10 is arranged on the front side of the one-way valve 9, a pressure gauge 11 is arranged on one side of the second electromagnetic valve 10 on the first high-pressure gas pipe 4, a vacuum switching valve 12 is arranged on the first high-pressure gas pipe 4 inside the pressure gauge 11, a vacuum output end 14 is arranged at one end of the first high-pressure gas pipe 4, a second flowmeter 13 is arranged on the first high-pressure gas pipe 4 on one side of the vacuum output end 14, a second high-pressure gas pipe 15 connected with the first high-pressure gas pipe 4 is arranged on the first electromagnetic valve 8, a PLC controller 16 is installed at one side of the vacuum output terminal 14.
The top of the gas tank 6 is provided with a gas inlet end 7, which is convenient for adding the gas of the gas tank 6.
The first high-pressure gas pipe 4 at the top end of the gas tank 6 is provided with a one-way valve 9 which can check the gas in the gas tank 6.
The first flowmeter 5 and the second flowmeter 13 are respectively and electrically connected with the input end of the PLC controller 16, and the output end of the PLC controller 16 is respectively and electrically connected with the first electromagnetic valve 8, the second electromagnetic valve 10 and the vacuum generator 3, so that signal transmission control is facilitated.
The pressure monitor is installed inside the gas tank 6, so that the pressure in the gas tank 6 can be monitored conveniently.
The first high-pressure gas pipe 4 and the second high-pressure gas pipe 15 are made of high-temperature-resistant plastics, so that the first high-pressure gas pipe 4 and the second high-pressure gas pipe 15 are guaranteed to have good high-temperature resistance.
Controlling a vacuum system comprising a vacuum generator device, comprising the steps of:
1) The first flowmeter 5 is arranged to collect the air flow at the position of the air outlet of the vacuum generator 3, the second flowmeter 13 is arranged to collect the air flow at the position of the vacuum output end 14, the first flowmeter 5 and the second flowmeter 13 transmit the collected signals to the input end of the PLC 16, and the signals are processed by the PLC 16;
2) If the flow signal of the first flowmeter 5 is greater than the flow signal of the second flowmeter 13, the output end of the PLC controller 16 sends an instruction to close the second electromagnetic valve 10 on the first high-pressure gas pipe 4, the second electromagnetic valve 10 on the branch pipe of the first high-pressure gas pipe 4 at the top end of the gas tank 6 is opened, the first electromagnetic valve 8 is opened, so that gas is supplied through the gas tank 6, and redundant vacuum gas generated by the vacuum generator 3 is stored in the gas tank 6, so that the energy waste of the vacuum generator 3 can be reduced;
3) If the flow signal of the first flowmeter 5 is smaller than the demand flow signal of the second flowmeter 13, the output end of the PLC controller 16 sends an instruction to the vacuum generator 3, the working power of the vacuum generator 3 is improved, the second electromagnetic valve 10 on the first high-pressure gas pipe 4 is opened, the second electromagnetic valve 10 on the branch pipe of the first high-pressure gas pipe 4 at the top end of the gas tank 6 is closed, intelligent control is facilitated, and the vacuum generator 3 is prevented from generating ineffective energy consumption.
Working principle: when the intelligent air-conditioning system is used, air enters through the air inlet 1, the air entering is filtered by the filter 2, the filtered air is processed by the vacuum generator 3 to generate vacuum air, the vacuum air generated by the vacuum generator 3 is conveyed to the vacuum output end 14 through the first high-pressure air pipe 4 for use by a user, the air flow at the position of the air outlet of the vacuum generator 3 is collected through the installed first flowmeter 5, the installed second flowmeter 13 collects the air flow at the position of the vacuum output end 14, the first flowmeter 5 and the second flowmeter 13 transmit collected signals to the input end of the installed PLC controller 16 for processing through the PLC controller 16, if the flow signals of the first flowmeter 5 are larger than those of the second flowmeter 13, the output end of the PLC controller 16 can send instructions to the second electromagnetic valve 10 on the first high-pressure air pipe 4 to be closed, the second electromagnetic valve 10 on the top end of the air tank 6 is opened, the first electromagnetic valve 8 is opened, accordingly the air is supplied through the air tank 6, the redundant vacuum air generated by the vacuum generator 3 is stored in the air tank 6, accordingly, the energy consumption of the first flowmeter 5 can be reduced, if the flow signals of the first flowmeter 5 are larger than those of the second electromagnetic valve 10 on the first high-pressure air pipe 4 are not needed, the second electromagnetic valve 10 on the second electromagnetic valve 3 is not needed, and the power of the second electromagnetic valve 3 is not needed to be opened, and the second electromagnetic valve 10 on the top end is not needed to be opened, and the second electromagnetic valve 3 is not needed, the second electromagnetic valve is not needed, and the energy is not needed, and is not is needed.
The beneficial effects are that: the invention has novel structure and ingenious conception, is convenient for reasonably using the gas generated by the vacuum generator, avoids generating redundant vacuum gas and reduces energy consumption.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. Vacuum system of a vacuum generator device comprising an air inlet (1) for air intake, characterized in that: still include filter (2), vacuum generator (3), first high pressure gas-supply pipe (4), first flowmeter (5), gas pitcher (6), inlet end (7), first solenoid valve (8), check valve (9), second solenoid valve (10), manometer (11), vacuum switching valve (12), second flowmeter (13), vacuum output end (14), second high pressure gas-supply pipe (15) and PLC controller (16), filter (2) are installed to one side of inlet (1), vacuum generator (3) are installed to one side of filter (2), one side of vacuum generator (3) is connected with first high pressure gas-supply pipe (4), install first flowmeter (5) on first high pressure gas-supply pipe (4), one side that first high pressure gas-supply pipe (4) are located first flowmeter (5) is connected with gas pitcher (6) through inlet end (7), one side of gas pitcher (6) bottom installs first solenoid valve (8), first high pressure gas-supply pipe (4) with first high pressure gas-supply pipe (4) are connected with first air pitcher (6) and first high pressure gas-supply pipe (4) is installed on one side of branch pipe (4), another second electromagnetic valve (10) is arranged at the front side of the one-way valve (9), a pressure gauge (11) is arranged at one side of the second electromagnetic valve (10) on the first high-pressure air pipe (4), a vacuum switching valve (12) is arranged on the first high-pressure air pipe (4) in the pressure gauge (11), a vacuum output end (14) is arranged at one end of the first high-pressure air pipe (4), a second flowmeter (13) is arranged on the first high-pressure air pipe (4) at one side of the vacuum output end (14), a second high-pressure air pipe (15) connected with the first high-pressure air pipe (4) is arranged on the first electromagnetic valve (8), and a PLC (16) is arranged at one side of the vacuum output end (14);
the first flowmeter (5) and the second flowmeter (13) are respectively and electrically connected with the input end of the PLC (16), and the output end of the PLC (16) is respectively and electrically connected with the first electromagnetic valve (8) and each second electromagnetic valve (10).
2. Vacuum system of a vacuum generator device according to claim 1, characterized in that the top end of the gas tank (6) is provided with an air inlet end (7).
3. Vacuum system of a vacuum generator device according to claim 1, characterized in that the inside of the gas tank (6) is fitted with a pressure monitor.
4. Vacuum system of a vacuum generator device according to claim 1, characterized in that the first high pressure gas pipe (4) and the second high pressure gas pipe (15) are both made of a high temperature resistant plastic.
5. Control of a vacuum system comprising a vacuum generator device according to any of claims 1-4, characterized by the steps of:
1) The air flow at the position of the air outlet of the vacuum generator (3) is collected through the first flowmeter (5), the air flow at the position of the vacuum output end (14) is collected through the second flowmeter (13), the first flowmeter (5) and the second flowmeter (13) transmit collected signals to the input end of the PLC (16) to be processed through the PLC (16);
2) If the flow signal of the first flowmeter (5) is larger than that of the second flowmeter (13), the output end of the PLC (16) can send an instruction to close the second electromagnetic valve (10) on the first high-pressure gas transmission pipe (4), the second electromagnetic valve (10) on the branch pipe of the first high-pressure gas transmission pipe (4) at the top end of the gas tank (6) is opened, the first electromagnetic valve (8) is opened, so that gas is supplied through the gas tank (6), and redundant vacuum gas generated by the vacuum generator (3) is stored in the gas tank (6), so that the energy waste of the vacuum generator (3) can be reduced;
3) If the flow signal of the first flowmeter (5) is smaller than the demand flow signal of the second flowmeter (13), the output end of the PLC (16) can send a command to the vacuum generator (3), the working power of the vacuum generator (3) is improved, the second electromagnetic valve (10) on the first high-pressure gas pipe (4) is opened, the second electromagnetic valve (10) on the branch pipe of the first high-pressure gas pipe (4) at the top end of the gas tank (6) is closed, intelligent control is facilitated, and the vacuum generator (3) is prevented from generating ineffective energy consumption.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210634573.4A CN114962355B (en) | 2022-06-07 | 2022-06-07 | Controlling a vacuum system comprising a vacuum generator device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210634573.4A CN114962355B (en) | 2022-06-07 | 2022-06-07 | Controlling a vacuum system comprising a vacuum generator device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114962355A CN114962355A (en) | 2022-08-30 |
| CN114962355B true CN114962355B (en) | 2023-11-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210634573.4A Active CN114962355B (en) | 2022-06-07 | 2022-06-07 | Controlling a vacuum system comprising a vacuum generator device |
Country Status (1)
| Country | Link |
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| CN (1) | CN114962355B (en) |
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| JPH07193021A (en) * | 1992-12-18 | 1995-07-28 | Tokyo Electron Tohoku Ltd | Thermal treatment equipment and its cleaning method |
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| JP4665045B1 (en) * | 2009-09-28 | 2011-04-06 | 株式会社テイエルブイ | Steam supply system and check valve used therefor |
| CN202991391U (en) * | 2012-06-28 | 2013-06-12 | 苏州安妮维斯电子科技有限公司 | Air type vacuum pump |
| CN105927511A (en) * | 2016-06-29 | 2016-09-07 | 广西玉柴机器股份有限公司 | Emergency energy system and method for air compressor |
| CN109556984A (en) * | 2018-12-07 | 2019-04-02 | 合肥通用机械研究院有限公司 | Fast aeration chilldown system and its application method |
| DE102019201170A1 (en) * | 2019-01-30 | 2020-07-30 | Robert Bosch Gmbh | Conveyor unit for an anode circuit of a fuel cell system for conveying a gaseous medium and fuel cell system |
| CN212250378U (en) * | 2020-01-15 | 2020-12-29 | 安徽益必生物科技有限公司 | High-pressure, normal-pressure gas and vacuum integrated machine |
| CN114526135A (en) * | 2022-02-23 | 2022-05-24 | 中国科学院工程热物理研究所 | Pressure and flow regulating mechanism, compressed gas energy storage system and regulating method |
| CN216665848U (en) * | 2021-12-07 | 2022-06-03 | 江苏联鑫电子工业有限公司 | Vacuum pump with negative pressure gas storage function |
-
2022
- 2022-06-07 CN CN202210634573.4A patent/CN114962355B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07193021A (en) * | 1992-12-18 | 1995-07-28 | Tokyo Electron Tohoku Ltd | Thermal treatment equipment and its cleaning method |
| JP2010185391A (en) * | 2009-02-13 | 2010-08-26 | Honda Motor Co Ltd | Ejector and fuel cell system using the ejector |
| JP4665045B1 (en) * | 2009-09-28 | 2011-04-06 | 株式会社テイエルブイ | Steam supply system and check valve used therefor |
| CN202991391U (en) * | 2012-06-28 | 2013-06-12 | 苏州安妮维斯电子科技有限公司 | Air type vacuum pump |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN114962355A (en) | 2022-08-30 |
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