CN113719455A - Vacuumizing device of complex terrain pipeline water delivery system and control method - Google Patents
Vacuumizing device of complex terrain pipeline water delivery system and control method Download PDFInfo
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- CN113719455A CN113719455A CN202111081021.7A CN202111081021A CN113719455A CN 113719455 A CN113719455 A CN 113719455A CN 202111081021 A CN202111081021 A CN 202111081021A CN 113719455 A CN113719455 A CN 113719455A
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- centrifugal pump
- pump
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- vacuum
- valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D9/00—Priming; Preventing vapour lock
- F04D9/004—Priming of not self-priming pumps
- F04D9/006—Priming of not self-priming pumps by venting gas or using gas valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0005—Control, e.g. regulation, of pumps, pumping installations or systems by using valves
- F04D15/0022—Control, e.g. regulation, of pumps, pumping installations or systems by using valves throttling valves or valves varying the pump inlet opening or the outlet opening
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
- F04D29/708—Suction grids; Strainers; Dust separation; Cleaning specially for liquid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/08—Pipe-line systems for liquids or viscous products
- F17D1/14—Conveying liquids or viscous products by pumping
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a vacuumizing device of a complex terrain pipeline water delivery system and a control method. The inlet water pipeline communicates to the water inlet of the centrifugal pump, the centrifugal pump is provided with a vacuumizing part, the vacuumizing part comprises an air duct, a vacuum pump and a valve, the valve is communicated with the vacuum pump through the air duct, the valve is communicated with the centrifugal pump, and the outlet end of the vacuum pump in the vacuum part is connected with a steam-water separator. The centrifugal pump has the beneficial effects that air in the pump cavity can be actively pumped, so that vacuum negative pressure is generated in the pump cavity, water with low water level is sucked, and the idle running of the centrifugal pump is avoided. The pump intracavity have rivers, can be abundant take away the gas and the dust particle in the pump intracavity, effectively avoid the phenomenon of cavitation erosion and wearing and tearing, prolong the life of centrifugal pump, reduce the operation and the maintenance cost of centrifugal pump simultaneously, make the operation of pipe-line system safety and stability, improve economic benefits.
Description
Technical Field
The invention relates to a vacuum device of a pipeline water delivery system and a control method, in particular to a vacuumizing device of a pipeline water delivery system in a complex terrain and a control method.
Background
The pipeline transportation is an energy-saving emission-reducing and environment-friendly project actively popularized and applied by the state at present, meets the sustainable development requirement of the state, is a project supported by national industrial policies, and is an important measure for improving economic benefits and reducing cost of enterprise implementation projects. With the development of urban construction and the increasing living standard, and natural drought, the water demand is continuously and sharply increased. Meanwhile, the water resources of water taking places such as lakes and the like are increasingly exhausted due to the continuous decline of the underground water level of a water source near cities caused by production, life, social activities and the like of human beings. In order to ensure sustainable development of social economy, protection of ecological water resources is urgent, and water transfer by using pump station pipelines and lake water and the like are enabled to flow and reasonably be used, so that an effective method for treating water pollution and protecting the ecological water resources is provided. Therefore, pipelines with long distance, high lift, large flow and complex terrains are adopted to deliver and transfer water more and more. The mechanical seal of the centrifugal pump has the advantages of reliable seal, long service life, low friction power consumption and the like, so the mechanical seal is widely applied to large and medium-sized pipeline water delivery and delivery projects in China, and more centrifugal pumps are used in water delivery and delivery systems.
In a complex-terrain large-pipe-diameter long-distance pipeline water delivery and transfer system, the terrain of a pipeline is complex, the terrain is complex and has large fluctuation, the condition that water in a low-water-level reservoir is transported to a high water level is often encountered, but the water level of a centrifugal pump is higher than that of the low-water-level reservoir, and the centrifugal pump needs water in the pump body to normally operate when operating, and most of the conventional implementation processes adopt a manual water irrigation mode. However, the method has the phenomena that gas in the centrifugal pump cavity is incompletely discharged, particles and dust are often remained in the pump cavity, and the main pump can be seriously cavitated and abraded when being started, and meanwhile, the manual irrigation is very inconvenient in the implementation process due to the complicated terrain and inconvenient traffic of a complicated terrain pipeline water delivery and adjustment project. This embodiment increases the construction cost, the maintenance cost of the project, and is inconvenient for the operation control of the whole water delivery system.
Disclosure of Invention
The invention aims to: the irrigation device aims at the problems that in the current manual irrigation implementation process, gas in a pump cavity is incompletely discharged, particles and dust are always reserved in the pump cavity, and the irrigation device is inconvenient to implement and maintain. The vacuumizing device and the control method of the complex terrain pipeline water delivery system are provided, cavitation generated in a pump cavity is effectively reduced, so that the service life of the system is prolonged, the operation and maintenance cost of a centrifugal pump is greatly reduced, the pipeline system is operated safely and stably, and the economic benefit is improved.
The technical scheme of the invention is as follows:
the invention provides a vacuumizing device of a complex terrain pipeline water delivery system, which comprises a water inlet pipeline, a centrifugal pump, a vacuumizing part and a centrifugal pump outlet part; the water inlet pipeline is communicated to the water inlet of the centrifugal pump, the centrifugal pump is provided with a vacuumizing part, the vacuumizing part comprises an air guide pipe, a vacuum pump and an electromagnetic valve, and the electromagnetic valve is communicated with the vacuum pump through the air guide pipe; the outlet part of the centrifugal pump is communicated to the outlet part of the centrifugal pump through a pipeline, and a first pressure transmitter is arranged on the pipeline between the outlet part of the centrifugal pump and the outlet part of the centrifugal pump. Air in the pump cavity of the centrifugal pump reaches the vacuum pump according to the direction of the guide arrow in the figures 1 and 2 and is discharged according to the direction of the guide arrow. After the air in the pump cavity of the centrifugal pump is pumped away, vacuum negative pressure is generated in the pump cavity, so that the water at the low water level of the pool is sucked. Utilize the water of evacuation portion initiative with the low water level to take out to the centrifugal pump in be full of the pump chamber, prepare for the centrifugal pump starts, can not cause the centrifugal pump idle running, simultaneously because inside rivers initiative flow through the pump chamber for the pump intracavity have rivers, and gas and dust particle in the pump chamber can be abundant taken away to rivers, make to possess better start-up environment in the centrifugal pump, effectively avoid the phenomenon of cavitation and wearing and tearing. Simultaneously, the vacuumizing time is effectively mastered by observing the vacuumizing effect constantly according to the observation port, and the starting effect of the centrifugal pump can be observed according to the first pressure transmitter after the centrifugal pump is started.
Further, the vacuumizing part is communicated to the top of the centrifugal pump. The centrifugal pump top is located the higher point of system, and the intercommunication top can be better take out gas and dust in the centrifugal pump and provide better start-up operational environment for the centrifugal pump, can close vacuum portion more in time when the vacuum pump extracts water, has reduced fortune dimension cost simultaneously, practices thrift manpower resources. The valve uses the solenoid valve, can guarantee that valve and vacuum pump can cooperate effectively, can guarantee that the vacuum pump closes the valve immediately after can stopping and prevents the centrifugal pump water because lose the suction and fall back.
Further, the centrifugal pump outlet portion includes a check valve. The check valve can effectively block water from flowing backwards from a high water level, the water hammer generated when the pipeline system is in failure is prevented from damaging the centrifugal pump, the check valve has certain air tightness, and after water is filled in a pump cavity of the centrifugal pump, the water can be filled in a pipeline in the inflow direction in front of the check valve, and the air tightness of the check valve can be increased. Because the water level in the pipeline is not high, and the vacuum pumping part on the centrifugal pump also increases negative pressure to the water in the pipeline, the flowing pressure of the water is far less than the opening pressure of the check valve, and the valve clack cannot be opened by the fluid pressure. Meanwhile, the larger the pressure in the backflow direction is, the tighter the valve clack is closed, and the better the sealing effect is.
Furthermore, the outlet part of the centrifugal pump also comprises an electric valve which is arranged at the rear end of the check valve and is communicated with the check valve through a pipeline. The defect of insufficient air tightness caused by abrasion of the check valve in long-term use or other reasons can be effectively avoided. The electric valve can be automatically opened and closed in time when the pressure of the first pressure transmitter and the pressure of the second pressure transmitter reach the preset condition.
Furthermore, a second pressure transmitter is arranged on a pipeline at the outlet of the electric valve. The pressure condition inside and outside the pipeline that check valve and motorised valve communicate can be observed through first pressure transmitter and second pressure transmitter, when guaranteeing that the motorised valve is opened, the flowing pressure of check valve front end is greater than the cracking pressure of check valve, and the valve clack can be opened by fluid pressure smoothly, prevents simultaneously that the motorised valve from opening back check valve rear end pressure and being greater than forward pressure and producing the refluence.
Furthermore, the outlet end of the vacuum pump is connected with a steam-water separator, the steam-water separator is communicated with the vacuum pump through a communicating pipe, and water after steam-water separation is conveyed to the working liquid communicating pipe through a water supply electromagnetic valve to be conveyed to the vacuum pump so as to provide working liquid for the vacuum pump. Due to the fact that the complex terrain pipeline is inconvenient in water delivery and transfer project and the complex terrain traffic is inconvenient, water taking is very inconvenient in the implementation process, a set of vacuum pump working solution water supply system is omitted through simple structural change, and construction cost, production cost and maintenance cost are reduced.
Furthermore, a manual ball valve and an observation port are arranged on the air duct between the electromagnetic valve and the centrifugal pump. The water delivery and transfer project in the complex terrain is complex in terrain and unstable in working environment of equipment operation, and a manual valve is arranged to deal with relevant conditions in order to avoid the condition that the failure of the electric equipment or the failure of the valve per se causes the failure of the valve to be normally opened and closed.
The invention provides a control method of a vacuumizing device of a complex terrain pipeline water delivery system, which comprises the following steps:
the method comprises the following steps: when the device is in a shutdown state before starting, testing that each valve switch can be normally opened and closed, checking that oil levels of oil grooves at the driving end and the free end of the centrifugal pump are sufficient, confirming that the power supply of the system is normal, enabling the electric valve to be in a closed state, and opening the manual ball valve (2);
step two: before the centrifugal pump is started, a valve is opened, and a vacuum pump is started at the same time;
step three: after the centrifugal pump is filled with water, the vacuum pump is closed, the electromagnetic valve is automatically closed at the same time, the centrifugal pump is started, and the electric valve is automatically opened. The automatic closing solenoid valve can effectively prevent the water in the centrifugal pump from falling back due to loss of suction after the vacuum pump stops, and meanwhile, the method can ensure that the water completely flows through the interior of the pump cavity, so that sufficient water flow is provided in the pump cavity, gas and dust particles in the pump cavity can be sufficiently taken away by the water flow, a better starting environment is provided in the centrifugal pump, and cavitation and abrasion are effectively avoided. The use effect is further improved, the operation equipment runs, and the labor cost is saved for the inconvenient complex terrain.
Further, after the centrifugal pump is started, when the pressure of the first pressure transmitter is larger than that of the second pressure transmitter, the electric valve is opened. After the electric valve is opened, the flow pressure at the front end of the check valve is greater than the opening pressure of the check valve, the valve clack can be smoothly opened by fluid pressure, and meanwhile, the backflow caused by the situation that the pressure at the rear end of the check valve is greater than the forward pressure after the electric valve is opened is prevented.
Compared with the prior art, the invention has the beneficial effects that:
1. after the air in the pump cavity of the centrifugal pump is pumped away, vacuum negative pressure is generated in the pump cavity, so that the water at the low water level of the pool is sucked. The vacuum pumping part is used for actively pumping the water with low water level into the centrifugal pump to fill the pump cavity, so that preparation is made for starting the centrifugal pump, and the centrifugal pump can not idle. The service life of the centrifugal pump is prolonged, and meanwhile, the operation and maintenance cost of the centrifugal pump is greatly reduced, so that the pipeline system can operate safely and stably, and the economic benefit is improved.
2. Meanwhile, because the water flow actively flows through the inside of the pump cavity, the water flow in the pump cavity can fully take away the gas and dust particles in the pump cavity, so that a better starting environment is provided in the centrifugal pump, and the phenomena of cavitation and abrasion are effectively avoided. Further prolonging the service life of the centrifugal pump and reducing the operation and maintenance cost of the centrifugal pump.
3. Because the electromagnetic valve is arranged, a worker can control the valve to be opened and closed from a far end and operate equipment to operate, so that in a complex-terrain large-pipe-diameter long-distance pipeline water delivery and transfer system, pipeline lines are located under the situation of complex terrain and inconvenient traffic, the labor cost for operation and maintenance of the centrifugal pump is greatly reduced, and the economic benefit is improved.
Drawings
FIG. 1 is a schematic view of a vacuum-pumping part of a vacuum-pumping device of a complex terrain pipeline water delivery system
FIG. 2 is a schematic view of a vacuum-pumping device of a complex terrain pipeline water delivery system
Reference numerals:
1-centrifugal pump, 2-manual ball valve, 3-observation port, 4-electromagnetic valve, 5-gas guide pipe, 6-vacuum pump, 7-guide arrow, 8-steam-water separator, 9-exhaust pipe, 10-guide arrow, 11-vacuum pumping device, 12-water inlet pipe, 13-guide arrow, 14-first pressure transmitter (with digital display meter), 15-check valve, 16-second pressure transmitter (with digital display meter), 17-electric valve, 18-water discharge pipe, 19-working fluid communicating pipe, 20-water discharge manual ball valve and 21-water supply electromagnetic valve.
Detailed Description
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The features and properties of the present invention are described in further detail below with reference to examples.
As shown in fig. 1 and 2, the vacuum-pumping device of the complex terrain pipeline water delivery system comprises a water inlet pipeline 12, a centrifugal pump 1, a vacuum-pumping part 11 and a pump outlet part. The water inlet pipeline 12 communicates to the water inlet of the centrifugal pump 1, the top end of the centrifugal pump 1 is provided with a vacuumizing part 11, the vacuumizing part 11 comprises 5-air ducts, a vacuum pump 6 and valves, an electromagnetic valve 4 is communicated with the vacuum pump 6 through the air ducts 5, the electromagnetic valve 4 is communicated with the centrifugal pump 1, a manual ball valve 2 is arranged on the air ducts 5 between the electromagnetic valve 4 and the centrifugal pump 1, an observation port 3 is arranged on a pipeline between the electromagnetic valve 4 and the vacuum pump 6, the vacuumizing part 11 communicates to the top of the centrifugal pump 1, the outlet end of the vacuum pump in the vacuumizing device is connected with a steam-water separator 8, after the steam-water separator is separated, gas is discharged through a 9 pipeline, water is conveyed to a working liquid communicating pipe 19 through a water supply electromagnetic valve 21 to the working liquid communicating pipe to provide working liquid for the vacuum pump, or is discharged from a water discharge pipe 18 through a manual ball valve 20.
The water pump outlet part comprises a first pressure transmitter 14, a check valve 15, a second pressure transmitter 16 and an electric valve 17, the check valve 15 is communicated to the water outlet of the centrifugal pump 1 through a pipeline, and the first pressure transmitter 14 is arranged on the pipeline between the check valve 15 and the centrifugal pump 1. The electric valve 17 is arranged at the end of the check valve 15 remote from the centrifugal pump 1 and is in communication with the check valve through a pipe. The outlet of the electric valve 17 is provided with a second pressure transmitter 16.
The use method and the principle of the vacuum pumping device of the complex terrain pipeline water delivery system are as follows:
the method comprises the following steps: when the device is in a shutdown state before starting, testing that each valve switch can be normally opened and closed, checking that oil levels of oil grooves at the driving end and the free end of the centrifugal pump 1 are sufficient, confirming that the power supply of the system is normal, opening the manual ball valve 2 and the observation port 3 when the electric valve 17 is in a closed state, and closing the electromagnetic valve 4;
step two: before the centrifugal pump 1 is started, a worker opens the manual ball valve 2, simultaneously starts the vacuum pump 6, and automatically opens the electromagnetic valve 4;
after the vacuum pump 6 is started, air in the pump cavity reaches the vacuum pump according to the direction of a guide arrow 10 in fig. 1 and 2, and then is discharged into the steam-water separator 8 according to the direction of a guide arrow 7. After the air in the pump cavity of the centrifugal pump is pumped away, vacuum negative pressure is generated in the pump cavity, so that the water at the low water level of the pool is sucked. The pump cavity of the centrifugal pump is filled with water with low water level, so that the centrifugal pump is prevented from idling. Meanwhile, because water flows through the water inlet pipeline 12 and the inside of the pump cavity of the centrifugal pump 1, residual air and dust particles in the pump cavity are taken away, a better starting environment is provided in the centrifugal pump, and cavitation erosion and abrasion are effectively avoided. When water flow reaches the check valve 15, the valve clack cannot be opened by fluid pressure because the water pressure in the pipeline at the front end of the check valve is not high and is smaller than the opening pressure of the check valve. The check valve has certain gas tightness, and after the pump cavity of the centrifugal pump is filled with water, the pipeline in the inflow direction in front of the check valve can be filled with water, and the gas tightness of the check valve can be increased. Meanwhile, the larger the pressure in the backflow direction is, the tighter the valve clack is closed, and the better the sealing effect is.
Step three: after the centrifugal pump 1 is filled with water, the vacuum pump 6 is automatically stopped, the electromagnetic valve 4 is automatically closed, then the centrifugal pump 1 is started, and after the centrifugal pump 1 is started, when the pressure of the first pressure transmitter 14 is greater than the pressure of the second pressure transmitter 16, the electric valve 17 is automatically opened. When outlet pressure is greater than pipeline pressure, guarantee after opening the motorised valve, the flowing pressure of check valve front end is greater than the cracking pressure of check valve, and the valve clack can be opened by fluid pressure smoothly, prevents simultaneously that the motorised valve from opening back check valve rear end pressure and being greater than forward pressure and producing the refluence.
The above-mentioned embodiments only express the specific embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the spirit of the invention, which falls within the scope of the invention.
Claims (9)
1. The vacuumizing device of the complex terrain pipeline water delivery system is characterized by comprising a water inlet pipeline (12), a centrifugal pump (1), a vacuumizing part (11) and a centrifugal pump outlet part; the water inlet pipeline (12) is communicated to a water inlet of the centrifugal pump (1), the centrifugal pump (1) is provided with a vacuumizing part (11), the vacuumizing part (11) comprises an air duct (5), a vacuum pump (6) and an electromagnetic valve (4), and the electromagnetic valve (4) is communicated with the vacuum pump (6) through the air duct (5); the outlet part of the centrifugal pump (1) is communicated to the outlet part of the centrifugal pump through a pipeline, and a first pressure transmitter (14) is arranged on the pipeline between the centrifugal pump (1) and the outlet part of the centrifugal pump.
2. The vacuum-pumping device of a complex terrain ducted water delivery system of claim 1, characterized in that the vacuum-pumping section (11) is connected to the top of the centrifugal pump (1).
3. The vacuum extractor of complex terrain ducted water delivery system of claim 1 or 2, characterized in that the centrifugal pump outlet section includes a check valve (15).
4. The vacuum-pumping device of the complicated terrain pipeline water delivery system of claim 3, characterized in that the centrifugal pump outlet portion further comprises an electric valve (17), and the electric valve (17) is arranged at the rear end of the check valve (15) and is communicated with the check valve (15) through a pipeline.
5. The vacuum extractor of complex terrain pipeline water delivery system of claim 4, characterized in that the second pressure transmitter (16) is arranged on the pipeline at the outlet of the electric valve (17).
6. The vacuumizing device of the complex terrain pipeline water delivery system according to claim 1 or 2, wherein a steam-water separator (8) is connected to an outlet end of the vacuum pump (6), the steam-water separator (8) is communicated with the vacuum pump (6) through a communicating pipe, and water after steam-water separation is delivered to the vacuum pump (6) through a water supply electromagnetic valve (21) and a working fluid communicating pipe (19) to provide working fluid for the vacuum pump (6).
7. The vacuum-pumping device of the complex terrain pipeline water delivery system of claim 6, characterized in that a manual ball valve (2) and a viewing port (3) are provided on the air duct (5) between the electromagnetic valve (4) and the centrifugal pump (1).
8. A control method of a vacuum-pumping device of a complex terrain pipeline water delivery system is characterized in that,
the method comprises the following steps: when the device is in a shutdown state before starting, testing that each valve switch can be normally opened and closed, checking that oil levels of oil grooves at the driving end and the free end of the centrifugal pump (1) are sufficient, confirming that the power supply of the system is normal, turning on the manual ball valve (2) when the electric valve (17) is in a closed state, and turning off the electromagnetic valve (4);
step two: before the centrifugal pump (1) is started, a vacuum pump (6) is started, and meanwhile, an electromagnetic valve (4) is automatically opened and an observation port (3) is checked;
step three: after the observation port (3) is filled with water, the centrifugal pump (1) is filled with water, the vacuum pump (6) stops, the electromagnetic valve (4) is automatically closed, then the centrifugal pump (1) is started, and the electric valve (17) is opened.
9. The control method of the vacuum-pumping device of the complex terrain pipeline water delivery system according to claim 8, characterized in that after the centrifugal pump (1) is started, when the pressure of the first pressure transmitter (14) is greater than the pressure of the second pressure transmitter (16), the electric valve (17) is automatically opened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111081021.7A CN113719455A (en) | 2021-09-15 | 2021-09-15 | Vacuumizing device of complex terrain pipeline water delivery system and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111081021.7A CN113719455A (en) | 2021-09-15 | 2021-09-15 | Vacuumizing device of complex terrain pipeline water delivery system and control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113719455A true CN113719455A (en) | 2021-11-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111081021.7A Pending CN113719455A (en) | 2021-09-15 | 2021-09-15 | Vacuumizing device of complex terrain pipeline water delivery system and control method |
Country Status (1)
| Country | Link |
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| CN (1) | CN113719455A (en) |
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2021
- 2021-09-15 CN CN202111081021.7A patent/CN113719455A/en active Pending
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