CN111946634A - Amphibious pressurizing water taking pump and pressurizing pump vehicle - Google Patents
Amphibious pressurizing water taking pump and pressurizing pump vehicle Download PDFInfo
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- CN111946634A CN111946634A CN202010977406.0A CN202010977406A CN111946634A CN 111946634 A CN111946634 A CN 111946634A CN 202010977406 A CN202010977406 A CN 202010977406A CN 111946634 A CN111946634 A CN 111946634A
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- Prior art keywords
- pump
- water
- driving motor
- amphibious
- pump body
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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
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D13/08—Units comprising pumps and their driving means the pump being electrically driven for submerged use
- F04D13/086—Units comprising pumps and their driving means the pump being electrically driven for submerged use the pump and drive motor are both submerged
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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
- F04D29/007—Details, component parts, or accessories especially adapted for liquid pumps
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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
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/5806—Cooling the drive system
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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
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/586—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps
- F04D29/588—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps cooling or heating the machine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M3/00—Portable or wheeled frames or beds, e.g. for emergency power-supply aggregates, compressor sets
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention relates to an amphibious booster water pump and a booster pump truck, the amphibious booster water pump comprises a controller, a pump body and a driving motor, a water outlet of the pump body is provided with a one-way valve and a liquid level sensor, the driving motor is provided with a current sensor for detecting the current value of the driving motor, the pump body is provided with a vacuum pump, the vacuum pump is used for pumping air in the pump body to form negative pressure in the pump body and pumping liquid to realize the cooling of the driving motor, the vacuum pump is connected with an inlet pipe and an outlet pipe, the inlet pipe is communicated with the pump body, the outlet pipe is used as a cooling pipe and wound on the shell of the driving motor, the liquid level sensor and the, the selector switch and the driving motor are in signal connection with the controller, and the controller is used for receiving detection signals of the liquid level sensor and the liquid level sensor, then performing comparison calculation, and controlling the driving motor and the selector switch to perform corresponding actions according to comparison calculation results. The invention has short laying time, improves the emergency efficiency, ensures the service life of the water pump and reduces the accident rate.
Description
Technical Field
The invention belongs to the technical field of water pumps, and particularly relates to an amphibious pressurizing water taking pump and a pressurizing pump truck.
Background
The existing pumps are classified according to whether the motor can be immersed in water, and can be divided into a submersible pump and a pump generally installed above the liquid level. The submersible pump is an important device for pumping water from a deep well, extracts underground water to the ground surface, and is an essential pumping device for domestic water, mine emergency, industrial cooling, farmland irrigation, seawater lifting, ship load regulation and the like. Pumps typically mounted above the liquid level, such as: the centrifugal pump can vaporize water and the pump can not suck water when the atmospheric pressure and the water pressure are reduced to a certain value, and the water suction lift of the common centrifugal pump can not exceed nine meters. At the same time, the pump unit cannot be submerged under water.
In the work of disaster relief and emergency rescue, the pump may need to be arranged in water to take water, and may also be flexibly installed and applied in some places inconvenient to install in water, and need to be arranged on land to take water, in addition, in order to guarantee the efficiency of emergency rescue, sometimes need to be applied to a water pipe pipeline system of remote transmission as the water pump, and in the activity of emergency rescue, uncertain factor is too many, the site environment is complicated, so the water pump carried is preferably amphibious, thus not only can save cost, but also can improve the efficiency of emergency rescue.
In view of the foregoing, it is desirable to provide a booster water pump that can be used both on land and on water and also as a booster pump, and a booster pump truck including the booster water pump.
Disclosure of Invention
The invention aims to provide a booster water pump vehicle which can be used as a booster pump in an amphibious manner and comprises the booster water pump.
The above purpose is realized by the following technical scheme: a water-land dual-purpose supercharging water taking pump comprises a controller, a pump body and a driving motor for driving an impeller of the pump body to rotate, wherein a water outlet of the pump body is provided with a one-way valve and a liquid level sensor, the liquid level sensor is arranged on the inner side of the one-way valve, the driving motor is provided with a current sensor for detecting the current value of the driving motor, the pump body is provided with a vacuum water pump, the vacuum water pump is a gas-liquid dual-purpose pump and is used for pumping air in the pump body to form negative pressure in the pump body and pumping liquid to realize cooling of the driving motor, the vacuum water pump switches a working mode through a switch and realizes starting and stopping of the vacuum water pump, the vacuum water pump is connected with an inlet pipe and an outlet pipe, the inlet pipe is communicated with the pump body, the outlet pipe is wound on a shell of the driving motor as a cooling pipe and is communicated, the outlet pipe is arranged in a plurality of circles along the circumferential direction of the driving motor, the liquid level sensor, the current sensor, the change-over switch and the driving motor are in signal connection with the controller, and the controller is used for receiving detection signals of the liquid level sensor and the liquid level sensor, then comparing and calculating the detection signals, and controlling the driving motor and the change-over switch to perform corresponding actions according to comparison and calculation results.
In the specific application process, the liquid level sensor detects the liquid level in the pump body and sends the liquid level information to the controller, the controller receives the liquid level information to perform comparison calculation and judges whether the pump body is full of water or not, if so, the pump body is in an in-water working state, the controller controls the driving motor to work and drives the impeller to rotate to do work, water enters from the water inlet of the pump body and flows out from the water outlet after passing through the one-way valve along the water flow channel of the pump body under the action of centrifugal force, otherwise, the controller controls the vacuum pump to pump air in the pump body, so that the pump body is internally vacuumized, under the action of atmospheric pressure, water at the water source flows into the water pump along the water suction pipe, the controller receives the liquid level information transmitted by the liquid level sensor to perform comparison processing and judges whether the pump body.
When the amphibious pressurizing water taking pump is used as a pressurizing pump on land, when the pressure of a water inlet of the amphibious pressurizing water taking pump serving as the pressurizing pump is monitored to reach a preset value, the controller controls the amphibious pressurizing water taking pump to be started at a low speed, the pressure value and the water flow of a water outlet of the amphibious pressurizing water taking pump are continuously monitored, the rotating speeds of the water taking pump in water and the amphibious pressurizing water taking pump serving as the pressurizing pump are matched and adjusted according to the increase of the flow and the pressure until the water outlet of the amphibious pressurizing water taking pump serving as the pressurizing pump reaches the preset water flow and pressure. When the water pump is used as a booster pump on land, the water pump needs to meet the requirement of long-time outlet stable pressure of a full-range working condition from zero flow to rated flow, and the use requirement of a terminal can be guaranteed. So can guarantee driving motor normal operating, motor heat is taken away through motor housing to pressure rivers, makes driving motor current stabilize at lower numerical value, and motor heat takes away through lasting rivers when water pump flow opens rated flow from zero flow, and motor current reduces, and when the electric current reduced to setting for minimum, vacuum pump stop work guaranteed the current stability that the booster pump land used through this method.
The driving motor is a high-speed permanent magnet variable frequency motor, stepless speed change can be realized within the variable frequency range of 0-227 HZ, and the driving motor has the advantages of small volume, light weight, high efficiency and the like; the shell of the water pump is made of cast aluminum alloy, so that the water pump has the advantages of light weight and good heat dissipation; the check valve normality is for closing, when the water pump draws water work, backs up the check valve through the pressure of water in the water pump, and rivers can flow from the delivery port, and when the water pump stop work, the check valve self return closed.
The vacuum pump is characterized in that the inlet pipe comprises a liquid inlet pipe and an air inlet pipe, the vacuum pump absorbs water to cool the driving motor and sucks air to enable negative pressure to be formed in the pump body through the liquid inlet pipe and the air inlet pipe respectively, the liquid inlet pipe is connected with the pump body at a water inlet of the pump body, and the air inlet pipe is connected with the pump body at a water outlet of the pump body. Therefore, the cooling water intake is arranged at the water inlet of the pump body, the water temperature is relatively low, and the air exhaust opening is arranged at the water outlet of the pump body, so that the pump body is conveniently vacuumized.
The amphibious pressurizing water taking pump is characterized in that a floating body is arranged at one end, provided with the driving motor, of the amphibious pressurizing water taking pump, and the floating body is fixedly connected with the pump body. When the water pump is submerged, the floating body can make the water pump be in a floating state.
The technical scheme is that the floating body comprises a first split body and a second split body, an accommodating space is formed between the first split body and the second split body, and the vacuum water pump is arranged in the accommodating space and fixedly connected with the driving motor. Therefore, the invention has more compact structure and more reasonable design.
The further technical scheme is that the amphibious pressurizing water taking pump is provided with traveling wheels. Preferably, the amphibious booster water pump is provided with 4 wheels for moving the water pump, and the amphibious booster water pump can be easily moved on a flat road.
The water pump is an amphibious pump, can be used under various working conditions, and is often used under the emergency condition of a dangerous case, the water taking vehicle needs to take water nearby, the shorter the laying time is, the better the laying time is, the water taking water source becomes the key of the laying time.
In order to achieve the purpose, the invention also provides a booster pump truck which comprises a drainage emergency truck and any one of the amphibious booster water-taking pumps, wherein the amphibious booster water-taking pump is arranged in a carriage of the drainage emergency truck.
The booster pump truck provided by the invention carries the amphibious booster water pump, can be used under various working conditions, can take water nearby under the emergency rescue condition with a dangerous case, is short in laying time, and can ensure long-time pressure-maintaining water supply and short-time quick water drainage.
The further technical scheme is that pressure gauges are arranged on two sides of an inlet and an outlet of the amphibious pressurizing water taking pump.
Compared with the prior art, the invention can be used under various working conditions, can quickly realize the water taking requirement according to the field water source condition, has short laying time and improves the emergency efficiency; in addition, when the booster pump is used as the booster pump, when the flow of the water pump is started from zero flow to rated flow, the heat of the driving motor is taken away through continuous water flow, the current of the driving motor is reduced, the stability of the current used on the land of the booster pump is ensured, the service life of the booster pump is ensured, and the accident rate is reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention.
Fig. 1 is a schematic diagram showing an internal structure of an amphibious booster water pump according to an embodiment of the present invention (arrows in the drawing indicate water flow directions);
FIGS. 2 and 3 are schematic diagrams of an amphibious booster water pump according to an embodiment of the present invention;
fig. 4 and 5 are schematic application diagrams of a booster pump truck according to an embodiment of the present invention.
In the figure:
1 pump body 2 driving motor 3 impeller 4 one-way valve
5 liquid level sensor 6 water outlet 7 water inlet 8 vacuum water pump
9 exit tube 10 liquid inlet tube 11 air inlet tube 12 floating body
13-traveling-wheel 14-water-pipe 15-land dual-purpose supercharging water-taking pump 16 carriage
Detailed Description
The present invention will now be described in detail with reference to the drawings, which are given by way of illustration and explanation only and should not be construed to limit the scope of the present invention in any way. Furthermore, features from embodiments in this document and from different embodiments may be combined accordingly by a person skilled in the art from the description in this document.
The embodiment of the invention is as shown in fig. 1, an amphibious pressurizing water taking pump 15 comprises a controller, a pump body 1 and a driving motor 2 for driving an impeller 3 of the pump body 1 to rotate, a water outlet 6 of the pump body 1 is provided with a one-way valve 4 and a liquid level sensor 5, the liquid level sensor 5 is arranged on the inner side of the one-way valve 4, the driving motor 2 is provided with a current sensor for detecting the current value of the driving motor 2, the pump body 1 is provided with a vacuum water pump 8, the vacuum water pump 8 is a gas-liquid dual-purpose pump, the vacuum water pump 8 is used for pumping air in the pump body 1 to form negative pressure in the pump body 1 and pumping liquid to realize cooling of the driving motor 2, the vacuum water pump 8 switches working modes through a switch and realizes starting and stopping of the vacuum water pump 8, the vacuum water pump 8 is connected with an inlet pipe and an outlet pipe 9, the inlet pipe is communicated, the outlet pipe 9 is wound on the shell of the driving motor 2 as a cooling pipe and is communicated with the outside of the amphibious supercharged water taking pump 15, the outlet pipe 9 is arranged in a plurality of circles along the circumferential direction of the driving motor 2, the liquid level sensor 5, the current sensor, the change-over switch and the driving motor 2 are in signal connection with the controller, and the controller is used for receiving detection signals of the liquid level sensor 5 and the liquid level sensor 5, then performing comparison calculation, and controlling the driving motor 2 and the change-over switch to perform corresponding actions according to comparison calculation results.
In the specific application process, as shown in fig. 1-3, the liquid level sensor 5 detects the liquid level in the pump body 1 and sends the liquid level information to the controller, the controller receives the liquid level information to perform comparison calculation and judges whether the pump body 1 is full of water, if so, the pump body is in the water working state, the controller controls the driving motor 2 to work to drive the impeller 3 to rotate to do work, water enters from the water inlet 7 of the pump body 1, flows out from the water outlet 6 after passing through the one-way valve 4 along the water flow channel of the pump body 1 under the action of centrifugal force, otherwise, the pump body is in the land working state, the controller controls the vacuum pump 8 to pump air in the pump body 1 to ensure that the, under the action of atmospheric pressure, water at a water source flows into the water pump along the water suction pipe 14, the controller receives liquid level information transmitted by the liquid level sensor 5, carries out comparison processing to judge whether the pump body 1 is full of water or not, and controls the driving motor 2 to work if the pump body is full of water.
As shown in fig. 5, when the amphibious supercharged water intake pump 15 serving as the booster pump is used on land, when the pressure of the water inlet 7 of the amphibious supercharged water intake pump 15 serving as the booster pump is monitored to reach a preset value, the controller controls to start the amphibious supercharged water intake pump 15 at a low speed, continues to monitor the pressure value and the water flow of the water outlet 6 of the amphibious supercharged water intake pump 15, and adjusts the rotation speeds of the water intake pump in water and the amphibious supercharged water intake pump 15 serving as the booster pump in a matching manner according to the increase of the flow and the pressure until the water outlet 6 of the amphibious supercharged water intake pump 15 serving as the booster pump reaches the preset. When land is used as a booster pump, the water pump needs to meet the requirement of long-time outlet stable pressure from zero flow to the full-range working condition of rated flow, and the use requirement of a terminal can be guaranteed, if the water pump is in zero flow, water in the water pump does not flow, and the water pump still continuously works, the current of the motor can continuously rise at this time, the current sensor detects the current value of the driving motor 2 and transmits the detected current information to the controller, the controller receives the current information to perform comparison calculation, when the current value of the driving motor 2 reaches the preset highest value, the controller controls the vacuum water pump 8 to extract water in the pump body 1 to cool the driving motor 2 until the current of the driving motor 2 is stabilized at the preset current value. So can guarantee driving motor 2 normal operating, motor heat is taken away through motor housing to pressure rivers, makes 2 electric currents of driving motor stabilize at lower numerical value, and motor heat is taken away through lasting rivers when water pump flow opens rated flow from zero flow, and motor current reduces, and when the electric current reduced to setting for minimum, vacuum pump 8 stop work guarantees through this method that the electric current that the booster pump land used is stable.
The driving motor 2 is a high-speed permanent magnet variable frequency motor, can realize stepless speed change in a variable frequency range of 0-227 HZ, and has the advantages of small volume, light weight, high efficiency and the like; the shell of the water pump is made of cast aluminum alloy, so that the water pump has the advantages of light weight and good heat dissipation; the check valve 4 normality is closed, when the water pump draws water and works, backs up the check valve 4 through the pressure of water in the water pump, and the rivers can be followed delivery port 6 and flow out, and when the water pump stop work, check valve 4 self-reset closed.
On the basis of the above embodiment, in another embodiment of the present invention, as shown in fig. 1, the inlet pipe includes a liquid inlet pipe 10 and an air inlet pipe 11, the vacuum pump 8 performs water absorption cooling to drive the motor 2 and sucks air through the liquid inlet pipe 10 and the air inlet pipe 11 respectively to form negative pressure in the pump body 1, the liquid inlet pipe 10 and the pump body 1 are connected to the water inlet 7 of the pump body 1, and the air inlet pipe 11 and the pump body 1 are connected to the water outlet 6 of the pump body 1. Therefore, the cooling water intake is arranged at the water inlet 7 of the pump body 1, the water temperature is relatively low, and the air exhaust opening is arranged at the water outlet 6 of the pump body 1, so that the pump body 1 is favorably vacuumized.
On the basis of the above embodiment, in another embodiment of the present invention, as shown in fig. 1, a floating body 12 is arranged at one end of the amphibious booster water pump 15, which is provided with the driving motor 2, and the floating body 12 is fixedly connected with the pump body 1. When the water pump is submerged, the floating body 12 can make the water pump present a floating state.
On the basis of the above embodiment, in another embodiment of the present invention, as shown in fig. 1, the floating body 12 includes a first split body and a second split body, an accommodating space is formed between the first split body and the second split body, and the vacuum water pump 8 is disposed in the accommodating space and fixedly connected to the driving motor 2. Therefore, the invention has more compact structure and more reasonable design.
In another embodiment of the invention, based on the above embodiment, the amphibious supercharged water intake pump 15 is provided with road wheels 13, as shown in fig. 1. Preferably, the amphibious booster water pump 15 is provided with 4 wheels for moving the water pump, and can be easily moved on a flat road.
The water pump is an amphibious pump, can be used under various working conditions, and is often used under the emergency condition of a dangerous case, the water taking vehicle needs to take water nearby, the shorter the laying time is, the better the laying time is, the water taking water source becomes the key of the laying time.
The invention also provides a booster pump vehicle, which comprises a drainage emergency vehicle and the amphibious booster water pump 15 as shown in fig. 4 and 5, wherein the amphibious booster water pump 15 is arranged in the carriage 16 of the drainage emergency vehicle.
The booster pump vehicle of the invention carries the amphibious booster water pump 15, can be used under various working conditions, can take water nearby under the emergency rescue situation with dangerous situations, has short arrangement time, and can ensure long-time pressure maintaining water supply and short-time quick water drainage.
On the basis of the above embodiment, in another embodiment of the present invention, pressure gauges are disposed on both sides of the inlet and the outlet of the amphibious pressurized water pump 15.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (7)
1. A water-land dual-purpose supercharging water taking pump comprises a controller, a pump body and a driving motor for driving an impeller of the pump body to rotate, and is characterized in that a one-way valve and a liquid level sensor are arranged at a water outlet of the pump body, the liquid level sensor is arranged on the inner side of the one-way valve, the driving motor is provided with a current sensor for detecting the current value of the driving motor, the pump body is provided with a vacuum water pump, the vacuum water pump is a gas-liquid dual-purpose pump and is used for pumping air in the pump body to form negative pressure in the pump body and pumping liquid to realize cooling of the driving motor, the vacuum water pump switches a working mode through a switch and realizes starting and stopping of the vacuum water pump, the vacuum water pump is connected with an inlet pipe and an outlet pipe, the inlet pipe is communicated with the pump body, the outlet pipe is wound on a shell of the driving motor as a cooling pipe and is communicated, the outlet pipe is arranged in a plurality of circles along the circumferential direction of the driving motor, the liquid level sensor, the current sensor, the change-over switch and the driving motor are in signal connection with the controller, and the controller is used for receiving detection signals of the liquid level sensor and the liquid level sensor, then comparing and calculating the detection signals, and controlling the driving motor and the change-over switch to perform corresponding actions according to comparison and calculation results.
2. The amphibious pressurized water pump according to claim 1, wherein the inlet pipe comprises a liquid inlet pipe and an air inlet pipe, the vacuum pump performs water absorption, cooling and driving of a motor and air suction through the liquid inlet pipe and the air inlet pipe respectively to form negative pressure in the pump body, the liquid inlet pipe and the pump body are connected to a water inlet of the pump body, and the air inlet pipe and the pump body are connected to a water outlet of the pump body.
3. The amphibious pressurized water pump according to claim 2, wherein a floating body is arranged at one end of the amphibious pressurized water pump where the driving motor is arranged, and the floating body is fixedly connected with the pump body.
4. The amphibious pressurized water pump according to claim 3, wherein the floating body comprises a first split body and a second split body, an accommodating space is formed between the first split body and the second split body, and the vacuum pump is arranged in the accommodating space and fixedly connected with the driving motor.
5. The amphibious booster water pump according to any one of claims 1 to 4, wherein the amphibious booster water pump is provided with road wheels.
6. A booster pump vehicle, characterized by comprising a drainage emergency vehicle and the amphibious booster water pump as claimed in any one of claims 1 to 5, wherein the amphibious booster water pump is arranged in a carriage of the drainage emergency vehicle.
7. The booster pump truck as claimed in claim 6, wherein pressure gauges are arranged on both sides of an inlet and an outlet of the amphibious booster water pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010977406.0A CN111946634A (en) | 2020-09-16 | 2020-09-16 | Amphibious pressurizing water taking pump and pressurizing pump vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010977406.0A CN111946634A (en) | 2020-09-16 | 2020-09-16 | Amphibious pressurizing water taking pump and pressurizing pump vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111946634A true CN111946634A (en) | 2020-11-17 |
Family
ID=73357613
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010977406.0A Pending CN111946634A (en) | 2020-09-16 | 2020-09-16 | Amphibious pressurizing water taking pump and pressurizing pump vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111946634A (en) |
-
2020
- 2020-09-16 CN CN202010977406.0A patent/CN111946634A/en active Pending
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