CN111425913B - Intelligent control type heat exchanger unit - Google Patents
Intelligent control type heat exchanger unit Download PDFInfo
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- CN111425913B CN111425913B CN202010436870.9A CN202010436870A CN111425913B CN 111425913 B CN111425913 B CN 111425913B CN 202010436870 A CN202010436870 A CN 202010436870A CN 111425913 B CN111425913 B CN 111425913B
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- Prior art keywords
- pipeline
- water
- water supply
- heat exchanger
- secondary network
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 274
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 19
- 238000011001 backwashing Methods 0.000 claims description 14
- 238000011010 flushing procedure Methods 0.000 claims description 10
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 claims 1
- 230000002035 prolonged effect Effects 0.000 abstract description 7
- 239000013589 supplement Substances 0.000 description 17
- 230000001276 controlling effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
- F24D3/105—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system pumps combined with multiple way valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
- F24D3/1058—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system disposition of pipes and pipe connections
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention discloses an intelligent control type heat exchange unit, which consists of a heat exchange unit and a PLC (programmable logic controller) control cabinet for overall control; the heat exchange unit comprises a primary network circulating pipeline and a secondary network circulating pipeline which are connected with the plate heat exchanger and provided with data acquisition devices; the data acquisition device is in communication connection with the PLC control cabinet; a secondary network water return pipeline on the water outlet side of the secondary network circulating pump set is connected with a secondary network water supply pipeline with a secondary network water supply pump set and a first water supply valve; a secondary net water replenishing pipeline at the water inlet side of the secondary net water replenishing pump set is connected with a water replenishing tank; the primary network water supply pipeline is connected with a secondary network water supply pipeline at the water outlet side of the secondary network water supply pump set through a primary network water supply branch pipe with a bidirectional pump and a second water supply valve; the primary network water supply branch pipe is connected with the water replenishing tank through a bypass pipe with a bypass valve; the intelligent control type heat exchange unit is high in heat exchange efficiency, and the service life of equipment is prolonged.
Description
Technical Field
The invention relates to an intelligent heat exchanger unit, in particular to an intelligent control type heat exchanger unit, and belongs to the technical field of heat exchanger units.
Background
The heat exchanger unit is an important device in a heating system and is responsible for exchanging heat of primary network circulation to secondary network circulation water to provide heating for users. The existing intelligent heat exchange unit is mostly composed of a heat exchanger, a variable frequency circulating pump, a water replenishing pump, a unit pipeline, a valve, a temperature transmitter, a pressure transmitter, an intelligent controller, a primary network water supply electric regulating valve and the like; the working principle is as follows: the primary heat source (steam or hot water) exchanges heat with the secondary return water pressurized by the circulating pump in the heat exchanger through the adjustment of the electric valve, and the hot water is sent to a user; and the secondary backwater is supplied with water and the pressure is fixed through a water supply pump. In the prior art, when the heat supply temperature of a primary network water supply pipeline is higher, the heat source supply quantity of the primary network side can be reduced only by adjusting the opening degree of an adjusting valve arranged on the primary network water supply pipeline; when the temperature of the heat source on the primary net side is ultrahigh, the high-temperature heat source enters the plate heat exchanger, so that the internal pipeline of the plate heat exchanger is easily damaged, the normal use of the plate heat exchanger is influenced, and the service life of the plate heat exchanger is shortened; and the heat exchange efficiency of the existing heat exchange unit needs to be improved. Therefore, in order to solve the above problems, it is necessary to design a new intelligent control type heat exchanger unit.
Disclosure of Invention
In order to solve the problems, the invention provides an intelligent control type heat exchange unit which is high in heat exchange efficiency and prolongs the service life of equipment.
The invention relates to an intelligent control type heat exchange unit, which consists of a heat exchange unit and a PLC control cabinet for overall control; the heat exchange unit comprises a primary network circulating pipeline and a secondary network circulating pipeline which are connected with the plate heat exchanger and provided with data acquisition devices; the data acquisition device is in communication connection with the PLC control cabinet; the primary network circulating pipeline consists of a primary network water supply pipeline with a regulating valve and a primary network water return pipeline; the secondary network circulating pipeline consists of a secondary network water supply pipeline and a secondary network water return pipeline; the secondary network water return pipeline is connected with a secondary network circulating pump set; a secondary network water return pipeline on the water outlet side of the secondary network circulating pump set is connected with a secondary network water supply pipeline with a secondary network water supply pump set and a first water supply valve; a secondary net water replenishing pipeline at the water inlet side of the secondary net water replenishing pump set is connected with a water replenishing tank; the primary network water supply pipeline is connected with a secondary network water supply pipeline at the water outlet side of the secondary network water supply pump set through a primary network water supply branch pipe with a bidirectional pump and a second water supply valve; the primary network water supply branch pipe is connected with the water replenishing tank through a bypass pipe with a bypass valve.
As a preferred embodiment, the system also comprises a back-flushing pipeline arranged at one side of the primary net circulating pipeline; the backwashing pipeline comprises a water inlet pipeline with a flushing pump set and connected with the water return side of the primary network of the plate heat exchanger through a backwashing water inlet switching valve, and a water outlet pipeline connected with the water supply side of the primary network of the plate heat exchanger through a backwashing water outlet switching valve; a return water switching valve is arranged between the primary net return water side of the plate heat exchanger and the primary net return water pipeline; and a water supply switching valve is arranged between the primary network water supply side of the plate heat exchanger and the primary network water supply pipeline.
Further, the data acquisition device comprises a temperature sensor, a pressure sensor and a flow sensor.
Furthermore, the water inlet sides of the primary network water supply pipeline and the secondary water return supply pipeline are respectively connected with a filter.
In a preferred embodiment, a secondary net water return pipeline on the water outlet side of the secondary net circulating pump group is also connected with a water drainage pipeline with a water drainage valve.
Compared with the prior art, the intelligent control type heat exchange unit has the advantages that a primary network water supply pipeline is connected with a secondary network water replenishing pipeline through a primary network water supply branch pipe with a bidirectional pump, the primary network water supply branch pipe is connected with a water replenishing tank through a bypass pipe, the bidirectional pump is mounted on the primary network water supply branch pipe, the water inlet and outlet directions of the bidirectional pump can be switched according to the situation that the primary network heat supply temperature heat exchange secondary network returns water and replenishes water, so that the water inlet temperature of the primary network water supply side of the plate heat exchanger is reduced, the phenomenon that the heat exchange pipeline in the plate heat exchanger is damaged due to overhigh water temperature entering the pipeline in the plate heat exchanger is avoided, and the service life of the plate heat exchanger is prolonged; and a back washing pipeline is also arranged, so that the internal pipeline of the plate heat exchanger can be regularly back washed, the plate heat exchanger can be conveniently cleaned, and the service life of the plate heat exchanger is prolonged.
Drawings
Fig. 1 is a schematic diagram of the overall system configuration of embodiment 1 of the present invention.
Fig. 2 is a schematic structural view of a heat exchanger unit according to embodiment 1 of the present invention.
Fig. 3 is a schematic diagram of the overall system configuration of embodiment 2 of the present invention.
Fig. 4 is a schematic structural diagram of a heat exchanger unit in embodiment 2 of the present invention.
The components in the drawings are labeled as: a-heat exchange unit, B-PLC operation cabinet, 1-plate heat exchanger, 2-primary network water supply pipeline, 3-primary network water return pipeline, 4-secondary network water supply pipeline, 5-secondary network water return pipeline, 6-secondary network circulating pump set, 7-secondary network water supply pump set, 8-first water supply valve, 9-secondary network water supply pipeline, 10-water supply tank, 11-bidirectional pump, 12-second water supply valve, 13-primary network water supply branch pipe, 14-bypass valve, 15-bypass pipe, 16-filter, 17-water discharge valve, 18-water discharge pipeline, 19-backflushing water inlet switching valve, 20-flushing pump set, 21-water inlet pipeline, 22-backflushing water outlet switching valve, 23-water outlet pipeline, 24-backwashing water return switching valve, 25-water supply switching valve, T-temperature sensor, P-pressure sensor and F-flow sensor.
Detailed Description
Example 1:
the intelligent control type heat exchange unit shown in fig. 1 and 2 is composed of a heat exchange unit A and a PLC control cabinet B for overall control; the heat exchanger unit A comprises a primary network circulating pipeline and a secondary network circulating pipeline which are connected with the plate heat exchanger 1 and provided with data acquisition devices; the data acquisition device is in communication connection with the PLC control cabinet B; the primary network circulating pipeline consists of a primary network water supply pipeline 2 with a regulating valve and a primary network water return pipeline 3; the secondary network circulating pipeline consists of a secondary network water supply pipeline 4 and a secondary network water return pipeline 5; the secondary network water return pipeline 5 is connected with a secondary network circulating pump unit 6; a secondary network water return pipeline 5 at the water outlet side of the secondary network circulating pump unit 6 is connected with a secondary network water supply pipeline 9 with a secondary network water supply pump unit 7 and a first water supply valve 8; a secondary net water replenishing pipeline 9 at the water inlet side of the secondary net water replenishing pump set 7 is connected with a water replenishing tank 10; the primary network water supply pipeline 2 is connected with a secondary network water supply pipeline 9 at the water outlet side of the secondary network water supply pump unit 7 through a primary network water supply branch pipe 13 with a bidirectional pump 11 and a second water supply valve 12; the primary network water supply branch pipe 13 is connected with the water replenishing tank 10 through a bypass pipe 15 with a bypass valve 14; when a temperature sensor on a primary network water supply pipeline detects that the heat supply temperature of a heat source is too high (or exceeds the normal working temperature of a plate heat exchanger), and a secondary network water return pipeline needs water supplement, a PLC control cabinet can be used for controlling opening of a second water supplement valve and a bidirectional pump, so that a primary network water supply branch pipe is communicated with the secondary network water supplement pipeline, and part of hot water/steam of the primary network water supply pipeline is guided to the secondary network water return pipeline through the secondary network water supplement pipeline, so that the temperature of the secondary network water return is increased, the temperature rise time of the secondary network circulating water is shortened, and the heat exchange efficiency is improved; if the water quantity supplied by the primary network water supply pipeline is insufficient, the PLC control cabinet can be used for controlling to simultaneously open the first water replenishing valve and the secondary network water replenishing pump set, so that the secondary network water replenishing pipeline is communicated with the water replenishing tank, and clear water stored in the water replenishing tank can be guided to the secondary network water returning pipeline through the secondary network water replenishing pipeline; when a temperature sensor on a primary network water supply pipeline detects that the heat supply temperature of a heat source is too high (or exceeds the normal working temperature of the plate heat exchanger), and a secondary network water return pipeline does not need water supplement, a PLC control cabinet can be used for controlling opening of a bypass valve and a bidirectional pump, the rotation direction of an impeller of the bidirectional pump is changed (the rotation direction of a motor of the bidirectional pump is changed through the PLC control cabinet), the water inlet and outlet direction of the bidirectional pump is changed, a primary network water supply branch pipe is connected with a water supplement tank through a bypass pipe, cold water in the water supplement tank is pumped to the primary network water supply pipeline through the bidirectional pump with the changed water inlet and outlet direction, the water inlet temperature of the primary network water supply side of the plate heat exchanger is reduced, the phenomenon that the internal heat exchange pipeline of the plate heat exchanger is damaged due to the overhigh water temperature entering the internal pipeline of the plate heat exchanger is avoided, and the service life of the plate heat exchanger is prolonged; when a temperature sensor on a primary network water supply pipeline detects that the heat supply temperature of a heat source is normal, and a secondary network water return pipeline needs water supplement (the detection values of a pressure sensor and a flow sensor on the secondary network water return pipeline are lower than a preset value), a PLC control cabinet can be used for controlling the opening of a first water supplement valve and a secondary network water supplement pump set, so that the secondary network water supplement pipeline is communicated with a water supplement tank, clean water stored in the water supplement tank can be guided to the secondary network water return pipeline through the secondary network water supplement pipeline, and the water pressure and the water flow of the secondary network water return pipeline are balanced; wherein, a water outlet of the water replenishing tank is provided with a water quality filter; the water pumps and the bidirectional pumps of the secondary network circulating pump group and the secondary network water replenishing pump group are connected with the frequency converter controlled by the PLC control cabinet, so that the water delivery amount is conveniently controlled; the bidirectional pump is a water pump capable of changing the arrangement of a water inlet and a water outlet by changing the rotation direction of an impeller in the prior art, and the specific structure and the working principle of the bidirectional pump are not detailed herein.
The data acquisition device comprises a temperature sensor T, a pressure sensor P and a flow sensor F.
The water inlet sides of the primary network water supply pipeline 2 and the secondary water return supply pipeline 5 are respectively connected with a filter 16 for filtering impurities, so that pipeline blockage is avoided, and heat exchange efficiency is influenced.
The secondary network return water pipeline 5 of its play water side of secondary network circulating pump unit 6 still is connected with the sluicing pipeline 18 that has the outlet valve 17, and when pressure sensor and flow sensor detection value on the secondary network return water pipeline were higher than the default, accessible PLC controlled the cabinet control and opened the outlet valve for the outlet pipe is connected with secondary network return water pipeline, through setting up the water pressure and the discharge of sluicing pipeline balanced secondary network return water pipeline.
Example 2:
the structure of the intelligent control type heat exchanger unit shown in fig. 3 and 4 is basically the same as that of embodiment 1, wherein the intelligent control type heat exchanger unit further comprises a back-flushing pipeline arranged on one side of the primary network circulation pipeline; the backwashing pipeline comprises a water inlet pipeline 21 with a flushing pump group 20 connected with the water return side of the primary network of the plate heat exchanger 1 through a backwashing water inlet switching valve 19, and a water outlet pipeline 23 connected with the water supply side of the primary network of the plate heat exchanger 1 through a backwashing water outlet switching valve 22; a return water switching valve 24 is arranged between the primary net return water side of the plate heat exchanger 1 and the primary net return water pipeline 3; a water supply switching valve 25 is arranged between the primary network water supply side of the plate heat exchanger 1 and the primary network water supply pipeline 2, and a back flushing pipeline is arranged, so that the internal pipeline of the plate heat exchanger can be regularly back flushed, the plate heat exchanger can be conveniently cleaned, and the service life of the plate heat exchanger is prolonged; specifically, when backwashing is needed, the PLC control cabinet controls a water supply switching valve of a primary network water supply pipeline and a water return switching valve of a primary network water return pipeline to act, and the connection between the primary network water supply pipeline and the primary network water return pipeline and the plate heat exchanger is cut off; then, opening a backflushing water inlet switching valve on a water inlet pipeline and a backflushing water outlet switching valve on a water outlet pipeline of the backflushing pipeline, starting a flushing pump set, pumping cleaning liquid to an inner pipeline of the plate type heat exchange pipe through the water inlet pipeline by using the flushing pump set, and discharging and collecting the cleaning liquid through the water outlet pipeline; after the washing is finished, the PLC control cabinet controls to close a backflushing water inlet switching valve on a water inlet pipeline of a backflushing pipeline, a backflushing water outlet switching valve on a water outlet pipeline and a washing pump set, and opens a water supply switching valve of a primary network water supply pipeline and a water return switching valve of a primary network water return pipeline, so that the primary network water supply pipeline and the primary network water return pipeline are communicated with the plate heat exchanger again; the back flushing pipeline can also be arranged on one side of the secondary network circulating pipeline of the plate heat exchanger or on both sides of the plate heat exchanger.
According to the intelligent control type heat exchange unit, a primary network water supply pipeline is connected with a secondary network water supplement pipeline through a primary network water supply branch pipe with a bidirectional pump, the primary network water supply branch pipe is connected with a water supplement tank through a bypass pipe, the bidirectional pump is installed on the primary network water supply branch pipe, the water inlet and outlet directions of the bidirectional pump can be switched according to the situation that the primary network heat supply temperature exchanges heat and the secondary network water supplement returns, so that the water inlet temperature of the primary network water supply side of the plate heat exchanger is reduced, the phenomenon that the internal heat exchange pipeline of the plate heat exchanger is damaged due to overhigh water temperature entering the internal pipeline of the plate heat exchanger is avoided, and the service life of the plate heat exchanger is prolonged; and a back washing pipeline is also arranged, so that the internal pipeline of the plate heat exchanger can be regularly back washed, the plate heat exchanger can be conveniently cleaned, and the service life of the plate heat exchanger is prolonged.
The above-described embodiments are merely preferred embodiments of the present invention, and all equivalent changes or modifications of the structures, features and principles described in the claims of the present invention are included in the scope of the present invention.
Claims (5)
1. An intelligent control type heat exchange unit consists of a heat exchange unit and a PLC control cabinet for overall control; the heat exchange unit comprises a primary network circulating pipeline and a secondary network circulating pipeline which are connected with the plate heat exchanger and provided with data acquisition devices; the data acquisition device is in communication connection with the PLC control cabinet; the primary network circulating pipeline consists of a primary network water supply pipeline with a regulating valve and a primary network water return pipeline; the secondary network circulating pipeline consists of a secondary network water supply pipeline and a secondary network water return pipeline; the secondary network water return pipeline is connected with a secondary network circulating pump set; a secondary network water return pipeline on the water outlet side of the secondary network circulating pump set is connected with a secondary network water supply pipeline with a secondary network water supply pump set and a first water supply valve; a secondary net water replenishing pipeline at the water inlet side of the secondary net water replenishing pump set is connected with a water replenishing tank; the method is characterized in that: the primary network water supply pipeline is connected with a secondary network water supply pipeline at the water outlet side of the secondary network water supply pump set through a primary network water supply branch pipe with a bidirectional pump and a second water supply valve; the primary network water supply branch pipe is connected with the water replenishing tank through a bypass pipe with a bypass valve.
2. The intelligent control type heat exchanger unit of claim 1, wherein: the device also comprises a back-washing pipeline arranged on one side of the primary network circulating pipeline; the backwashing pipeline comprises a water inlet pipeline with a flushing pump set and connected with the water return side of the primary network of the plate heat exchanger through a backwashing water inlet switching valve, and a water outlet pipeline connected with the water supply side of the primary network of the plate heat exchanger through a backwashing water outlet switching valve; a return water switching valve is arranged between the primary net return water side of the plate heat exchanger and the primary net return water pipeline; and a water supply switching valve is arranged between the primary network water supply side of the plate heat exchanger and the primary network water supply pipeline.
3. The intelligent control type heat exchanger unit of claim 1, wherein: the data acquisition device comprises a temperature sensor, a pressure sensor and a flow sensor.
4. The intelligent control type heat exchanger unit of claim 1, wherein: and the water inlet sides of the primary network water supply pipeline and the secondary water return pipeline are respectively connected with a filter.
5. The intelligent control type heat exchanger unit of claim 1, wherein: and a secondary network water return pipeline on the water outlet side of the secondary network circulating pump group is also connected with a water drain pipeline with a water drain valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010436870.9A CN111425913B (en) | 2020-05-21 | 2020-05-21 | Intelligent control type heat exchanger unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010436870.9A CN111425913B (en) | 2020-05-21 | 2020-05-21 | Intelligent control type heat exchanger unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111425913A CN111425913A (en) | 2020-07-17 |
| CN111425913B true CN111425913B (en) | 2021-11-05 |
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| CN202010436870.9A Active CN111425913B (en) | 2020-05-21 | 2020-05-21 | Intelligent control type heat exchanger unit |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102269442B (en) * | 2011-07-13 | 2013-08-21 | 清华大学 | Heating system utilizing heat pump technology to improve heating capacity of central heating pipe network |
| CN103335359A (en) * | 2013-07-09 | 2013-10-02 | 浙江大学昆山创新中心 | Intelligent heat exchange station |
| CN105444243A (en) * | 2014-09-02 | 2016-03-30 | 盾安（天津）节能系统有限公司 | Waste heat recovery heat supply and water charging system and water charging method |
| CN104864488A (en) * | 2014-11-25 | 2015-08-26 | 青岛同创节能环保工程有限公司 | Full-automatic heating system capable of realizing switching between heat exchange heating and direct connection heating |
| CN208237955U (en) * | 2018-04-18 | 2018-12-14 | 石家庄国融安能分布能源技术有限公司 | A kind of heat-exchange unit for simplifying optimization |
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2020
- 2020-05-21 CN CN202010436870.9A patent/CN111425913B/en active Active
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