CN111502967A - Optimized parallel operation method for multiple variable-frequency water pumps - Google Patents
Optimized parallel operation method for multiple variable-frequency water pumps Download PDFInfo
- Publication number
- CN111502967A CN111502967A CN202010250049.8A CN202010250049A CN111502967A CN 111502967 A CN111502967 A CN 111502967A CN 202010250049 A CN202010250049 A CN 202010250049A CN 111502967 A CN111502967 A CN 111502967A
- Authority
- CN
- China
- Prior art keywords
- frequency
- water pumps
- water pump
- water
- pump
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/20—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by changing the driving speed
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention relates to an optimized parallel operation method of a plurality of variable frequency water pumps, which comprises the following steps: 1) obtaining the characteristics of a single water pump by the parameter fitting of a variable frequency water pump sample; 2) acquiring the performance characteristics of each water pump under the condition that a plurality of water pumps are connected in parallel according to a similar principle, and comparing and verifying or correcting the performance characteristics with the actually measured data; 3) the number and the frequency of the running water pumps on the transmission and distribution side are optimized through a limit frequency method, the number and the frequency of the optimized water pumps are obtained on the premise that the lift requirement and the flow requirement are met, and the frequency floating radius is given to serve as a quantitative running mode of the running of the water pumps under the variable working conditions. Compared with the prior art, the method has the advantages of low data requirement, easiness in realization, quantitative guidance operation and the like.
Description
Technical Field
The invention relates to the technical field of building energy conservation and heating ventilation air conditioning, in particular to a method for optimizing parallel operation of multiple variable-frequency water pumps.
Background
With the increasing maturity of the frequency conversion technology, a plurality of frequency conversion water pumps are selected to be connected in parallel to convey fluid for large buildings. Therefore, a large number of Chinese and foreign scholars research the performance and control method of the variable frequency water pump. For example, a scholars establishes the relation between the efficiency and the rotating speed of the pump and defines the optimal control criterion of the pump; some calculate the output power of the motor shaft and compare them by drawing the characteristic curve of the lift flow; some proposals have 2 water pumps working simultaneously above the intersection point of the equal power and equal flow curves, which is energy-saving, and only 1 water pump is used below the intersection point.
The above research conclusion is based on theoretical analysis and is not easy to be realized in practical engineering for the following reasons:
1) in the existing heating, ventilation and air conditioning building, only total flow does not have a single flow, so that quantitative research on single characteristics is difficult;
2) monitoring data of the existing heating and ventilation building cannot be effectively and fully utilized, and the actual situation cannot be further fitted;
3) a quantitative operation strategy cannot be given to the existing heating and ventilation building based on the existing operation mode.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a method for optimizing parallel operation of a plurality of variable frequency water pumps.
The purpose of the invention can be realized by the following technical scheme:
a method for optimizing parallel operation of a plurality of variable frequency water pumps comprises the following steps:
1) obtaining the characteristics of a single water pump by the parameter fitting of a variable frequency water pump sample;
2) acquiring the performance characteristics of each water pump under the condition that a plurality of water pumps are connected in parallel according to a similar principle, and comparing and verifying or correcting the performance characteristics with the actually measured data;
3) the number and the frequency of the running water pumps on the transmission and distribution side are optimized through a limit frequency method, the number and the frequency of the optimized water pumps are obtained on the premise that the lift requirement and the flow requirement are met, and the frequency floating radius is given to serve as a quantitative running mode of the running of the water pumps under the variable working conditions.
In the step 1), when the ratio of the current rotating speed of the water pump to the rated rotating speed, namely the rotating speed ratio ω, is 1, the expression of the characteristic curve of the single water pump is as follows:
H＝a1Q2+a2Q+a3
η＝c1Q2+c2Q+c3
wherein H is the pump head, η is the efficiency of the pump, Q is the pump flow, a1、a2、a3、c1、c2、c3Are all performance constants.
In the step 2), when a plurality of water pumps are connected in parallel, the rotating speed ratio omega of each water pumpxWhen the water flow rate is less than 1, the performance characteristics of each water pump when a plurality of water pumps are connected in parallel are expressed as follows:
wherein N isx、ηx、Hx、QxThe water pump shaft power, the water pump efficiency, the water pump lift and the water pump flow of each water pump under the variable frequency working condition that x water pumps are connected in parallel are respectively, and gamma is the volume weight of the conveyed liquid.
The limit frequency is defined as:
assuming that the isobaric pressure curve and the isobaric power curve of the pump intersect at a point, the frequency value corresponding to the point is the limit frequency.
The step 3) specifically comprises the following steps:
31) the number x of running water pumps and the rotation speed ratio omega of each water pump are measured by actual measurement dataxAnd the total flow Q is used as input, the water pump efficiency η of each water pump is calculatedxAnd pump head Hx；
32) Assuming that i water pumps in total operate, making i equal to 1 and i less than n, wherein n is the total number of the building water pumps;
33) order to
Hi＝HxOmega is obtained by calculationiAnd ηiSubscript i represents each water pump under the variable frequency working condition that i water pumps are connected in parallel;
34) comparison ηiAnd ηxWhen ηi＞ηxThen, the number i of the running water pumps at the moment and the flow Q of each water pump are outputiAnd the rotation speed ratio omega of each water pumpiWhen ηi＜ηxThen the number x of running water pumps of the actually measured data and the rotation speed ratio omega of each water pump are outputxAnd a total flow rate Q;
35) and comparing i with n, if n is greater than i, making i equal to i +1, returning to the step 33), and if n is less than i, ending.
The calculation formula of the frequency floating radius is as follows:
Rf＝MAX(fmax-fa,fa-fmin)
wherein f ismaxFor optimizing the frequency maximum, f, within the flow rangeaFor optimizing the frequency average, f, over a range of flow ratesminFor optimizing the frequency minimum, omega, within the flow rangex＝fx/f0，fxFor the current frequency, f0Is the nominal frequency.
Compared with the prior art, the invention has the following advantages:
the optimization target of the invention is the existing building variable frequency water pump with multiple water pump monitoring data of the same model, the optimization condition has low requirement on the data, only the flow of a header pipe is needed, the optimization is easy to realize in the actual engineering, the existing data can be fully utilized to be attached to the performance of the actual water pump, a quantitative operation mode is given under the condition of meeting the flow requirement and the lift requirement, and the invention can be used for correcting and guiding the operation of the existing building variable frequency water pump.
Drawings
Fig. 1 is a flow chart of optimization of the number and frequency of operation of the delivery and distribution side water pumps by the limit frequency method.
Fig. 2 is a characteristic curve of a ground source side water pump.
Fig. 3 is an air-conditioning side water pump characteristic curve.
Fig. 4 is a comparison graph of actual power and fitted power at the ground source side.
Fig. 5 is a comparison graph of the actual power and the fitted power of the air conditioner side.
Fig. 6 is a graph comparing power before and after optimization of the ground source side.
Fig. 7 is a comparison graph of power before and after optimization on the air conditioner side.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
The invention provides a method for optimizing parallel operation of a plurality of variable frequency water pumps, which comprises the following steps: obtaining a single characteristic curve by the parameter fitting of a variable frequency water pump sample, then obtaining the parallel performance characteristics of a plurality of water pumps by utilizing a similar principle and comparing and verifying (or correcting) the parallel performance characteristics with measured data, optimizing the number and frequency of running water pumps at a transmission and distribution side by a limit frequency method, obtaining the number and frequency of the optimized water pumps on the premise of meeting the requirements of lift and flow, and providing a frequency floating radius, and providing a quantized running strategy for the running of the water pumps under variable working conditions, wherein the specific process is as follows:
1) fitting individual water pump characteristics
In order to describe the performance characteristics under the non-rated working condition, defining omega as the ratio of the current rotating speed of the water pump to the rated rotating speed, and when omega is 1, calculating models of the pump lift and the efficiency of the water pump are respectively as follows:
H＝a1Q2+a2Q+a3(1.1)
η＝c1Q2+c2Q+c3(1.2)
in the formula, H is the pump lift, m, η is the efficiency of the pump, Q is the flow rate of the pump, m3/h；am，bm-a performance constant, m ═ 1, 2, 3;
2) parallel connection characteristic of multiple water pumps
When the water pump rotation speed ratio omega is less than 1, the relationships between the flow, the lift, the power and the rotation speed under the variable rotation speed working condition and the rated rotation speed working condition can be established according to a similar law:
Qx＝ωQ0(1.3)
Hx＝ω2H0(1.4)
Nx＝ω3N0(1.5)
in the formula: subscript x represents the variable frequency operating condition of x water pumps connected in parallel, subscript 0 represents the rated operating condition, and N represents the shaft power of the water pumps.
The rotation speed ratio of the single pump is omega1The characteristic curve fitting equation of time is as follows:
H＝a1Q2+a2ω1Q+a3ω1 2(1.6)
η＝c1ω1 (-2)Q2+c2ω1 (-1)Q+c3(1.7)
wherein gamma represents the volume weight of the transported liquid and is 9807N/m 3.
Therefore, the rotation speed ratios of the two water pumps (synchronous frequency conversion) of the parallel model are both omega2(ii) a From Q2Q/2, then:
H2＝a1Q2 2+a2ω2Q2+a3ω2 2(1.9)
η2＝c1ω2 (-2)Q2 2+c2ω2 (-1)Q2+c3(1.10)
and in the same way, the characteristic curve of one water pump when a plurality of water pumps are connected in parallel can be obtained.
3) Limit frequency
According to the similar characteristics of the variable frequency pump, under the same hydraulic working condition, the faster the rotating speed of the pump is, the higher the frequency is, the larger the lift of the pump, namely the outlet pressure is, and the larger the shaft power of the pump is, the equal pressure curve and the equal power curve of the pump are supposed to intersect at a point, the frequency value corresponding to the point is the limit frequency, and the frequency corresponding to two water pumps under the condition that the power, the pressure and the total flow of one water pump are equal can be obtained.
4) The optimization process takes 4 parallel units as an example, as shown in fig. 1.
Example (b):
taking an existing ground source heat pump air conditioning system building as an example, the ground source heat pump air conditioning system building is applied to the ground source side and the air conditioning side of the building, and the examples are as follows:
(1) the water pump performance parameters and performance curves are shown in table 1, fig. 2 and fig. 3.
TABLE 1 circulating Water Pump Performance parameters
And comparing with the actual power for verification. The results of the two sides are respectively shown in fig. 4 and fig. 5, and the results show that the errors of the ground source side and the air conditioner are respectively within 3% and 6.9%, and the characteristic fitting effect of the circulating water pump is good;
(2) optimization results (compare to actual operating input power)
As shown in fig. 6 and 7, the optimization results show that:
total flow on ground source side is 220m3·h-1-400m3·h-1When the water source is in the range, the two water pumps on the ground source side are connected in parallel, and the energy saving rate of the existing working condition is about 31.6%; total flow on ground source side is 400m3·h-1-430m3·h-1In the process, three water pumps are connected in parallel, and the energy saving rate is about 19.56%.
The total flow of the air conditioner side is 360m3·h-1-440m3·h-1The optimization result in the range basically runs in parallel according to two water pumps, wherein the energy saving rate of the optimization result of the parallel running of three water pumps is about 4%. The total flow of the air conditioner side is 440m3·h-1-460m3·h-1In the range, the energy saving rate is about 4.1%. The total flow of the air conditioner side is 460m3·h-1-520m3·h-1Within the range, the energy saving rate is about 12.82%, and the optimization effect is obvious.
(3) Operation modes, as shown in tables 2 and 3
TABLE 2 ground source side operation strategy
TABLE 3 air conditioner side operating strategy
The optimization target of the method is that the existing building variable-frequency water pump with multiple water pump monitoring data of the same model is provided, the optimization condition has low requirement on the data, only the flow of a main pipe is needed, the method is easy to realize in the actual engineering, the performance of the existing data attached to the actual water pump can be fully utilized, and a quantitative operation mode is provided under the condition of meeting the flow requirement and the lift requirement. The method can be used for correcting and guiding the operation of the variable-frequency water pump of the existing building.
Claims (6)
1. A method for optimizing parallel operation of a plurality of variable frequency water pumps is characterized by comprising the following steps:
1) obtaining the characteristics of a single water pump by the parameter fitting of a variable frequency water pump sample;
2) acquiring the performance characteristics of each water pump under the condition that a plurality of water pumps are connected in parallel according to a similar principle, and comparing and verifying or correcting the performance characteristics with the actually measured data;
3) the number and the frequency of the running water pumps on the transmission and distribution side are optimized through a limit frequency method, the number and the frequency of the optimized water pumps are obtained on the premise that the lift requirement and the flow requirement are met, and the frequency floating radius is given to serve as a quantitative running mode of the running of the water pumps under the variable working conditions.
2. The method for optimizing parallel operation of multiple variable frequency water pumps according to claim 1, wherein in the step 1), when a ratio of a current rotating speed of the water pumps to a rated rotating speed, namely a rotating speed ratio ω, is 1, a characteristic curve expression of a single water pump is as follows:
H＝a1Q2+a2Q+a3
η＝c1Q2+c2Q+c3
wherein H is the pump head, η is waterEfficiency of the pump, Q being the pump flow, a1、a2、a3、c1、c2、c3Are all performance constants.
3. The method for optimizing parallel operation of multiple variable frequency water pumps according to claim 2, wherein in the step 2), when multiple water pumps are connected in parallel, the rotating speed ratio omega of each water pump isxWhen the water flow rate is less than 1, the performance characteristics of each water pump when a plurality of water pumps are connected in parallel are expressed as follows:
wherein N isx、ηx、Hx、QxThe water pump shaft power, the water pump efficiency, the water pump lift and the water pump flow of each water pump under the variable frequency working condition that x water pumps are connected in parallel are respectively, and gamma is the volume weight of the conveyed liquid.
4. The method for optimizing parallel operation of a plurality of variable frequency water pumps according to claim 1, wherein the limit frequency is defined as:
assuming that the isobaric pressure curve and the isobaric power curve of the pump intersect at a point, the frequency value corresponding to the point is the limit frequency.
5. The method for optimizing the parallel operation of the multiple variable-frequency water pumps according to claim 3, wherein the step 3) specifically comprises the following steps:
31) the number x of running water pumps and the rotation speed ratio omega of each water pump are measured by actual measurement dataxAnd the total flow Q is used as input to calculate the water pump efficiency of each water pumpRate ηxAnd pump head Hx；
32) Assuming that i water pumps in total operate, making i equal to 1 and i less than n, wherein n is the total number of the building water pumps;
33) order to
Hi＝HxOmega is obtained by calculationiAnd ηiSubscript i represents each water pump under the variable frequency working condition that i water pumps are connected in parallel;
34) comparison ηiAnd ηxWhen ηi＞ηxThen, the number i of the running water pumps at the moment and the flow Q of each water pump are outputiAnd the rotation speed ratio omega of each water pumpiWhen ηi＜ηxThen the number x of running water pumps of the actually measured data and the rotation speed ratio omega of each water pump are outputxAnd a total flow rate Q;
35) and comparing i with n, if n is greater than i, making i equal to i +1, returning to the step 33), and if n is less than i, ending.
6. The method for optimizing parallel operation of a plurality of variable frequency water pumps according to claim 1, wherein in the step 3), the calculation formula of the frequency floating radius is as follows:
Rf＝MAX(fmax-fa,fa-fmin)
wherein f ismaxFor optimizing the frequency maximum, f, within the flow rangeaFor optimizing the frequency average, f, over a range of flow ratesminThe frequency minimum is optimized for the flow range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010250049.8A CN111502967A (en) | 2020-04-01 | 2020-04-01 | Optimized parallel operation method for multiple variable-frequency water pumps |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010250049.8A CN111502967A (en) | 2020-04-01 | 2020-04-01 | Optimized parallel operation method for multiple variable-frequency water pumps |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111502967A true CN111502967A (en) | 2020-08-07 |
Family
ID=71875897
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010250049.8A Pending CN111502967A (en) | 2020-04-01 | 2020-04-01 | Optimized parallel operation method for multiple variable-frequency water pumps |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111502967A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111927745A (en) * | 2020-09-10 | 2020-11-13 | 福州大学 | Energy-saving control method of parallel full-variable-frequency water pump set used in water intaking engineering |
| CN113818516A (en) * | 2021-10-13 | 2021-12-21 | 广州凯士比流体技术有限公司 | High-rise secondary water supply energy-saving control system |
| CN114413458A (en) * | 2022-01-25 | 2022-04-29 | 清华大学 | Water pump parallel operation control method, device, equipment and medium for air-conditioning water system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0275781A (en) * | 1988-09-09 | 1990-03-15 | Toshiba Corp | Control device for feed pump |
| JP2000009042A (en) * | 1998-06-29 | 2000-01-11 | Kawamoto Pump Mfg Co Ltd | Operation method for variable speed pump and variable speed pump device |
| CN103195698A (en) * | 2013-04-19 | 2013-07-10 | 哈尔滨工业大学 | Energy-saving control method for synchronous variable-speed regulation of water pumps in water-level-variable water intake pump station |
| CN105864016A (en) * | 2016-04-27 | 2016-08-17 | 西安建筑科技大学 | Variable-water-volume operation regulating method for open multi-water-pump transmission and distribution system |
| CN206360877U (en) * | 2016-12-09 | 2017-07-28 | 深圳市海源节能科技有限公司 | A kind of optimal control for energy saving system of variable frequency pump parallel running |
| CN110043455A (en) * | 2019-04-02 | 2019-07-23 | 深圳市海源节能科技有限公司 | A kind of parallel water pump runing adjustment method, intelligent terminal and storage medium |
-
2020
- 2020-04-01 CN CN202010250049.8A patent/CN111502967A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0275781A (en) * | 1988-09-09 | 1990-03-15 | Toshiba Corp | Control device for feed pump |
| JP2000009042A (en) * | 1998-06-29 | 2000-01-11 | Kawamoto Pump Mfg Co Ltd | Operation method for variable speed pump and variable speed pump device |
| CN103195698A (en) * | 2013-04-19 | 2013-07-10 | 哈尔滨工业大学 | Energy-saving control method for synchronous variable-speed regulation of water pumps in water-level-variable water intake pump station |
| CN105864016A (en) * | 2016-04-27 | 2016-08-17 | 西安建筑科技大学 | Variable-water-volume operation regulating method for open multi-water-pump transmission and distribution system |
| CN206360877U (en) * | 2016-12-09 | 2017-07-28 | 深圳市海源节能科技有限公司 | A kind of optimal control for energy saving system of variable frequency pump parallel running |
| CN110043455A (en) * | 2019-04-02 | 2019-07-23 | 深圳市海源节能科技有限公司 | A kind of parallel water pump runing adjustment method, intelligent terminal and storage medium |
Non-Patent Citations (1)
| Title |
|---|
| 仇文君等: ""SHMFF并联变频水泵的控制策略与优化"", 《流体机械》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111927745A (en) * | 2020-09-10 | 2020-11-13 | 福州大学 | Energy-saving control method of parallel full-variable-frequency water pump set used in water intaking engineering |
| CN113818516A (en) * | 2021-10-13 | 2021-12-21 | 广州凯士比流体技术有限公司 | High-rise secondary water supply energy-saving control system |
| CN114413458A (en) * | 2022-01-25 | 2022-04-29 | 清华大学 | Water pump parallel operation control method, device, equipment and medium for air-conditioning water system |
| CN114413458B (en) * | 2022-01-25 | 2022-12-09 | 清华大学 | Water pump parallel operation control method, device, equipment and medium for air-conditioning water system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111502967A (en) | Optimized parallel operation method for multiple variable-frequency water pumps | |
| CN105571073B (en) | A kind of subway station air-conditioner water system frequency conversion control energy-saving method | |
| CN103994553B (en) | A kind of refrigeration system cooling water energy-saving control method, system and device | |
| CN105864016B (en) | A kind of more water pump distributing system variable water volume runing adjustment methods of open type | |
| CN106251079B (en) | Industrial circulating cooling water system optimization method based on annual average cooling energy efficiency ratio and optimized operation | |
| CN101865613B (en) | Cooling tower integrated energy-saving system based on power synthesizer and control method thereof | |
| CN105004002A (en) | Energy saving control system and energy saving control method used for central air conditioner cooling water system | |
| CN109185972B (en) | Heat station circulating pump optimization adjusting method | |
| CN115823706B (en) | Self-adaptive variable pressure difference energy-saving control system and method for primary pump | |
| CN108151246A (en) | Air quantity variable air conditioner wind system Optimization of Energy Saving control method and device | |
| CN1186572C (en) | Variable pressure difference and variable flow rate control method and system for air conditioning water system | |
| CN112084707A (en) | Refrigeration machine room energy-saving optimization method and system based on variable flow decoupling of chilled water and cooling water | |
| CN111197776B (en) | Flow distribution control method for central flue system of high-rise building | |
| CN105302984A (en) | Modeling and simulation method for ground source heat pump set | |
| CN103383127A (en) | Method for tuning a ventilation system | |
| CN110332656B (en) | Ventilation air-conditioning system of underground water power station factory building and operation control method thereof | |
| CN104481893B (en) | Optimized water pump energy conservation control method | |
| CN105736434B (en) | The method for monitoring performance and system of a kind of power plant fans | |
| CN111723533A (en) | Energy-saving calculation method for variable-frequency water pump of ground source heat pump system | |
| CN112779950A (en) | Integral optimization energy-saving method for circulating water system | |
| CN107305055B (en) | A kind of frequency-changing control system of water pump of central air conditioner | |
| CN116378972A (en) | Water pump operation method based on demand feedback | |
| CN111197777B (en) | Flow distribution control method for central flue system of high-rise building | |
| CN217402906U (en) | Secondary pump linkage structure | |
| CN112558560B (en) | Cold volume transmission and distribution dynamic optimization and energy-saving regulation and control system of data center refrigerating system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200807 |
|
| RJ01 | Rejection of invention patent application after publication |