CN108201798B - Method for mixing multiple liquids in high-precision online proportion - Google Patents
Method for mixing multiple liquids in high-precision online proportion Download PDFInfo
- Publication number
- CN108201798B CN108201798B CN201711443988.9A CN201711443988A CN108201798B CN 108201798 B CN108201798 B CN 108201798B CN 201711443988 A CN201711443988 A CN 201711443988A CN 108201798 B CN108201798 B CN 108201798B
- Authority
- CN
- China
- Prior art keywords
- liquid
- output
- preset
- mixing
- ratio
- 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.)
- Active
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/40—Mixing liquids with liquids; Emulsifying
- B01F23/405—Methods of mixing liquids with liquids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/40—Mixing liquids with liquids; Emulsifying
- B01F23/49—Mixing systems, i.e. flow charts or diagrams
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/80—Forming a predetermined ratio of the substances to be mixed
- B01F35/88—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise
- B01F35/883—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise using flow rate controls for feeding the substances
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D11/00—Control of flow ratio
- G05D11/02—Controlling ratio of two or more flows of fluid or fluent material
- G05D11/13—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means
- G05D11/139—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means by measuring a value related to the quantity of the individual components and sensing at least one property of the mixture
Abstract
The invention discloses a method for mixing multiple liquids in high-precision online proportion, which is characterized in that a backflow bypass is additionally arranged at the tail end of a main conveying pipeline in each liquid output unit, a backflow proportion regulating valve is arranged on the backflow bypass, a liquid flowmeter is arranged at the tail end of the output pipeline, an output proportion regulating valve is arranged at the front end of the liquid flowmeter, when the conveying of the liquids to be mixed is started, the backflow proportion regulating valves in the liquid output units are made to be at the maximum opening degree and the output proportion regulating valves are made to be at the preset opening degree, then the real-time flow values of the liquids are collected and compared and regulated with the preset flow, when the real-time flow values of the liquids are regulated to be within the preset flow range, the ratio of the real-time flow between the liquids to be mixed is calculated according to a preset mixing target, and is compared with the preset mixing proportion value in size and regulated again, thereby realizing the on-line high-precision mixing of various liquids and having wide application range.
Description
Technical Field
The invention relates to an online proportional mixing system for multiple liquids, in particular to a high-precision online proportional mixing method for multiple liquids.
Background
With the gradual development of the fire protection industry, more and more foam liquid types are suitable for A-type and B-type fire disasters. When the fire extinguishing foam is used, the foam liquid and water are mixed according to a certain proportion, air is sucked to form foam while the foam gun or the foam gun sprays the foam to the surface of a combustion object, and then a covering layer is formed, so that the fire extinguishing purpose is achieved. The foam proportioner is a nerve center of the foam fire extinguishing system, and the working performance of the foam proportioner is directly related to the success or failure of the foam fire extinguishing system in fighting fire. In addition, in the industries of oil refining, chemical engineering, pharmacy, beverage and the like, the mixing of various liquids is also an indispensable procedure and is an important component in the production process, and the production requirements which must be met are accurate in proportioning and reliable in control.
In the prior art, control methods and system techniques for proportional mixing of various liquids have been reported, for example: chinese patent application CN201380010494.5 provides a proportional mixing system and method, which is a system for mixing a main liquid and a slave liquid at a predetermined mixing ratio, the main liquid being supplied from a main liquid pump to a mixer via a main liquid pipe, the slave liquid being supplied from a slave liquid pump to the main liquid pipe via a slave liquid pipe connected to the main liquid pipe and being added to the main liquid, and although the present invention can recognize an error accumulated in the past by using the integrated flow rates of the main liquid and the slave liquid, the mixing ratio of the flow rates of the main liquid and the slave liquid can be maintained at a target predetermined mixing ratio, and an on-line proportional mixing of a plurality of liquids is realized, since the main liquid and the slave liquid are both supplied and regulated by a pump, when the supply capacity of the liquid supply pump is larger than the mixing flow rate by a large amount, since the flow rate demand is small, the pressure of the conveying pipeline can be increased, so that the pressure relief valve is opened to release partial flow to achieve balance, the pressure relief valve only can adjust the pressure and cannot enable the flow to obtain a balanced value, the mixing precision of the system is difficult to guarantee, and particularly when the proportioning value is greatly changed, the phenomenon is more obvious when the flow is changed from large to small; especially for some pumps with low rotation speed and large internal leakage, the mixing ratio precision can not be ensured at all when the flow rate changes in a large range.
Overall, one-way control is employed, namely: the method of controlling the flow only on the conveying pipeline has the defects of insufficient regulation range and limited precision improvement.
Disclosure of Invention
In view of the above problems in the prior art, the present invention is to provide a method for mixing multiple liquids at a high precision on-line ratio, so as to realize on-line high precision ratio mixing of multiple liquids.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a method for mixing multiple liquids in a high-precision online proportion comprises a controller, a mixing container and a plurality of liquid output units, wherein each liquid output unit at least comprises a liquid source and a main conveying pipeline, the head end of the main conveying pipeline is connected with the liquid source, the tail end of the main conveying pipeline is divided into an output pipeline and a backflow bypass, the tail end of the output pipeline is connected with the mixing container, a liquid flowmeter is arranged at the tail end of the output pipeline, a backflow proportion adjusting valve is arranged in the backflow bypass, an output proportion adjusting valve is arranged at the front end of the liquid flowmeter, the signal output end of the liquid flowmeter is connected with the signal input end of the controller, and the signal output end of the controller is respectively connected with the signal input ends of the backflow proportion adjusting valve and the output proportion adjusting valve; the method comprises the following steps:
s1) starting the transportation of each liquid to be mixed, and opening the reflux ratio regulating valve in each liquid output unit to the maximum opening and opening the output ratio regulating valve to the preset opening;
s2) the controller firstly obtains the real-time flow value of each liquid conveyed to the mixing container according to the liquid flow meter in each liquid output unit, and judges whether the real-time flow value of each liquid conveyed to the mixing container is within the preset flow range, if not, then judges whether the real-time flow value is larger than or smaller than the preset flow, if so, the controller reduces the opening of the output proportion regulating valve corresponding to the liquid, and if so, the controller reduces the opening of the reflux proportion regulating valve corresponding to the liquid; if yes, step S3 is waited for;
s3) when the real-time flow value of each liquid is in the preset flow range through the flow adjusting process of the step S2), the controller calculates the ratio of the real-time flow between the liquids to be mixed according to the preset mixing target and compares the ratio with the preset mixing ratio value, if the comparison result is greater than the preset mixing ratio value, the controller reduces the opening degree of the output ratio adjusting valve corresponding to the liquid located in the numerator of the ratio or/and controls the opening degree of the output ratio adjusting valve corresponding to the liquid located in the denominator to increase, and if the comparison result is less than the preset mixing ratio value, the controller increases the opening degree of the output ratio adjusting valve corresponding to the liquid located in the numerator of the ratio or/and controls the opening degree of the output ratio adjusting valve corresponding to the liquid located in the denominator to decrease.
The conveying power of the liquid source is pump power or high-level pressure difference, when the pump power is the liquid conveying pump, the liquid conveying pump is in bidirectional electric signal connection with the controller, and when the high-level pressure difference is generated by a high-level liquid storage container, an electromagnetic valve is arranged at a liquid outlet of the high-level liquid storage container and is in bidirectional signal connection with the controller.
The outlet of the return bypass is preferably connected to the respective liquid supply container, but can also be connected to a separate liquid storage container.
In a preferable embodiment, the preset opening degree in step S1) is 30% to 60% of the maximum opening degree.
In a preferable embodiment, the preset flow range in step S2) is obtained by floating the theoretical flow value up and down according to the required mixing precision.
Compared with the prior art, the invention has the beneficial technical effects that:
the invention adds a reflux bypass at the end of the main conveying pipeline in each liquid output unit, sets a reflux proportion regulating valve on the reflux bypass, sets a liquid flowmeter at the end of the output pipeline, sets an output proportion regulating valve at the front end of the liquid flowmeter, when starting the conveying of the liquid to be mixed, the reflux proportion regulating valve in each liquid output unit is firstly set to be the maximum opening degree and the output proportion regulating valve to be the preset opening degree, then calculates the ratio of the real-time flow between the liquids to be mixed according to the preset mixing target by acquiring the real-time flow value of each liquid and comparing and regulating with the preset flow, when the real-time flow value of each liquid is regulated to be in the preset flow range, and compares and regulates again with the preset mixing proportion value, thereby not only ensuring the stable output of each liquid, but also making quick response to the change of the flow, and each liquid can be stably output according to the preset flow, the precision of the mixing proportion is high, the online high-precision mixing requirement of various liquids can be met, the application range is wide, and the method has obvious progress and practicability.
Drawings
FIG. 1 is a schematic diagram of a hybrid system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a connection structure of the controller according to the embodiment of the present invention;
fig. 3 is a schematic flow chart of the embodiment of the invention for realizing high-precision on-line proportional mixing of multiple liquids.
The numbers in the figures are as follows: 1. a controller; 2. a mixing vessel; 3A, A liquid output unit; 31A, A liquid source; 311A, A liquid storage container; 312A, A liquid delivery pump; 313A, A input line; 32A, A delivery main; 33A, A output line; 34A, A reflux bypass; 35A, A liquid flow meter; 36A, A reflux ratio regulating valve; 37A, A output proportional regulating valve; 3B, B liquid output unit; 31B, B liquid source; 311B, B liquid storage container; 312B, B liquid delivery pump; 313B, B input line; 32B, B delivery main; 33B, B output line; 34B, B reflux bypass; 35B, B liquid flow meter; 36B, B reflux ratio regulating valve; 37B, B output a proportional regulating valve.
Detailed Description
The technical solution of the present invention is further described in detail below with reference to the accompanying drawings and examples.
Examples
Please refer to fig. 1 and fig. 2: the system for realizing online proportional mixing of multiple liquids in this embodiment includes a controller 1, a mixing container 2, and 2 liquid output units 3A/3B (2 in this embodiment are taken as an example, but not limited to 2, the specific number is determined according to the kind of liquid to be mixed, and 1 liquid output unit corresponds to each liquid to be mixed), each liquid output unit 3A/3B includes at least a liquid source 31A/31B and a main delivery pipeline 32A/32B, the liquid source 31A/31B in this embodiment includes a liquid storage container 311A/311B and a liquid delivery pump 312A/312B, the liquid storage container 311A/311B is connected with the liquid delivery pump 312A/312B through an input pipeline 313A/313B, an output end of the liquid delivery pump 312A/312B is connected with a head end of the main delivery pipeline 32A/32B, at the end of said delivery main 32A/32B there are divided into an outlet line 33A/33B and a return bypass 34A/34B, the end of the outlet line 33A/33B is connected to the mixing vessel 2, a liquid flow meter 35A/35B is provided at the end of the outlet line 33A/33B, a reflux ratio regulating valve 36A/36B is provided on the reflux bypass 34A/34B, an output ratio regulating valve 37A/37B is provided at the front end of the liquid flow meter 35A/35B, and the signal output of the liquid flow meter 35A/35B is connected to the signal input of the controller 1, and the signal output end of the controller 1 is respectively connected with the signal input end of the backflow proportion regulating valve 36A/36B and the signal input end of the output proportion regulating valve 37A/37B.
Referring to fig. 3, the method for mixing multiple liquids in a high-precision online ratio by using the system of the present invention includes the following steps:
s1) initiates delivery of liquid to be mixed A, B (i.e.: starting A, B the liquid delivery pumps 312A, 312B), and opening the reflux ratio regulating valves 36A, 36B in the respective liquid output units 3A, 3B to the maximum opening and the output ratio regulating valves 37A, 37B to the preset opening (the preset opening is between 0 and 100%, preferably between 30% and 60% of the maximum opening);
s2) the controller 1 firstly obtains the real-time flow value of each liquid conveyed to the mixing container 2 according to the liquid flow meter 35A/35B in each liquid output unit 3A/3B, and judges whether the real-time flow value of each liquid conveyed to the mixing container 2 is within the preset flow range (obtained by floating the theoretical flow value up and down according to the required mixing precision), if not, then judges whether the real-time flow value is larger than or smaller than the preset flow, if so, the controller 1 reduces the opening degree of the output proportion regulating valve 37A/37B corresponding to the liquid, and if so, the controller 1 reduces the opening degree of the reflux proportion regulating valve 36A/36B corresponding to the liquid; if yes, step S3 is waited for;
s3) when the flow rate adjustment processing of step S2) makes the real-time flow rate value of each liquid within the preset flow rate range, the controller 1 calculates the ratio of the real-time flow rates between the liquids to be mixed again in accordance with the predetermined mixing target (for example: QA: QB) and comparing with a preset mixing proportion value, if the comparison result is greater than the preset mixing proportion value, the controller 1 controls the opening degree of the output proportion regulating valve 37A corresponding to the liquid A positioned in the ratio numerator to be reduced or/and controls the opening degree of the output proportion regulating valve 37B corresponding to the liquid B positioned in the ratio denominator to be increased, and if the comparison result is less than the preset mixing proportion value, the controller 1 controls the opening degree of the output proportion regulating valve 37A corresponding to the liquid A positioned in the ratio numerator to be increased or/and controls the opening degree of the output proportion regulating valve 37B corresponding to the liquid B positioned in the ratio denominator to be reduced.
In addition, it should be noted that: the delivery power of the liquid source 31A/31B may also be a high pressure differential, for example: a high-level liquid container is adopted, so that the liquid stored in the high-level container is input to the main conveying pipeline 32A/32B through a potential difference; in order to accurately control the input operation of the liquid, an electromagnetic valve can be arranged at the liquid output port of the high-level liquid storage container, the electromagnetic valve is in bidirectional signal connection with the controller, and the intelligent switching and the conveying flow of the liquid are realized through the controller.
The output of the return bypass 34A/34B may also be connected to a separate liquid storage container.
In summary, the invention adds the backflow bypass at the end of the main conveying pipeline in each liquid output unit, sets the backflow proportion regulating valve on the backflow bypass, sets the liquid flowmeter at the end of the output pipeline, sets the output proportion regulating valve at the front end of the liquid flowmeter, when starting the conveying of the liquid to be mixed, the backflow proportion regulating valve in each liquid output unit is made to be the maximum opening degree and the output proportion regulating valve to the preset opening degree, then calculates the ratio of the real-time flow between the liquids to be mixed according to the preset mixing target by acquiring the real-time flow value of each liquid and comparing and regulating with the preset flow, and when the real-time flow value of each liquid is regulated to the preset flow range, and compares and regulates again with the preset mixing proportion value, thereby not only ensuring the stable output of each liquid, and the device can make quick response to the change of the flow, ensure that each liquid can be stably output according to the preset flow, has high precision of mixing proportion, can meet the online high-precision mixing requirement of various liquids, has wide application range and has obvious progress and practicability.
It is finally necessary to point out here: the above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (6)
1. A method for mixing multiple liquids in a high-precision online proportion comprises a controller, a mixing container and a plurality of liquid output units, wherein each liquid output unit at least comprises a liquid source and a main conveying pipeline, the head end of the main conveying pipeline is connected with the liquid source, the tail end of the main conveying pipeline is divided into an output pipeline and a backflow bypass, the tail end of the output pipeline is connected with the mixing container, a liquid flowmeter is arranged at the tail end of the output pipeline, a backflow proportion adjusting valve is arranged in the backflow bypass, an output proportion adjusting valve is arranged at the front end of the liquid flowmeter, the signal output end of the liquid flowmeter is connected with the signal input end of the controller, and the signal output end of the controller is respectively connected with the signal input ends of the backflow proportion adjusting valve and the output proportion adjusting valve; characterized in that the method comprises the following steps:
s1) starting the transportation of each liquid to be mixed, and opening the reflux ratio regulating valve in each liquid output unit to the maximum opening and opening the output ratio regulating valve to the preset opening;
s2) the controller firstly obtains the real-time flow value of each liquid conveyed to the mixing container according to the liquid flow meter in each liquid output unit, and judges whether the real-time flow value of each liquid conveyed to the mixing container is within the preset flow range, if not, then judges whether the real-time flow value is larger than or smaller than the preset flow, if so, the controller reduces the opening of the output proportion regulating valve corresponding to the liquid, and if so, the controller reduces the opening of the reflux proportion regulating valve corresponding to the liquid; if yes, step S3 is waited for; the preset flow range is obtained by floating a theoretical flow value up and down according to the required mixing precision;
s3) when the real-time flow value of each liquid is in the preset flow range through the flow adjusting process of the step S2), the controller calculates the ratio of the real-time flow between the liquids to be mixed according to the preset mixing target and compares the ratio with the preset mixing ratio value, if the comparison result is greater than the preset mixing ratio value, the controller reduces the opening degree of the output ratio adjusting valve corresponding to the liquid located in the numerator of the ratio or/and controls the opening degree of the output ratio adjusting valve corresponding to the liquid located in the denominator to increase, and if the comparison result is less than the preset mixing ratio value, the controller increases the opening degree of the output ratio adjusting valve corresponding to the liquid located in the numerator of the ratio or/and controls the opening degree of the output ratio adjusting valve corresponding to the liquid located in the denominator to decrease.
2. The method of claim 1, wherein: the delivery power of the liquid source is pump power or high-level pressure difference.
3. The method of claim 2, wherein: when the pump power is a liquid delivery pump, the liquid delivery pump is in bidirectional electric signal connection with the controller.
4. The method of claim 2, wherein: when the high-level pressure difference is generated by a high-level liquid storage container, an electromagnetic valve is arranged at a liquid outlet of the high-level liquid storage container, and the electromagnetic valve is in bidirectional signal connection with the controller.
5. The method of claim 1, wherein: the output end of the backflow bypass is connected with the liquid storage container.
6. The method of claim 1, wherein: the preset opening degree in the step S1) is 30% to 60% of the maximum opening degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711443988.9A CN108201798B (en) | 2017-12-27 | 2017-12-27 | Method for mixing multiple liquids in high-precision online proportion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711443988.9A CN108201798B (en) | 2017-12-27 | 2017-12-27 | Method for mixing multiple liquids in high-precision online proportion |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108201798A CN108201798A (en) | 2018-06-26 |
| CN108201798B true CN108201798B (en) | 2020-12-08 |
Family
ID=62605161
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711443988.9A Active CN108201798B (en) | 2017-12-27 | 2017-12-27 | Method for mixing multiple liquids in high-precision online proportion |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108201798B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112506240A (en) * | 2020-11-20 | 2021-03-16 | 广德君安达消防科技有限公司 | Intelligent liquid mixing and proportioning method and system |
| CN113244848B (en) * | 2021-05-14 | 2022-09-06 | 北京百瑞弘霖有害生物防治科技有限责任公司 | Control method and control device for preparing mixed medicament |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6719921B2 (en) * | 2000-09-29 | 2004-04-13 | Degussa Ag | Process for the continuous production of mixtures of substances and reaction mixtures and device for its implementation |
| CN201429799Y (en) * | 2009-06-25 | 2010-03-24 | 贵阳铝镁设计研究院 | Fluid discharge flow capacity regulating device |
| CN1743061B (en) * | 2004-09-02 | 2010-05-12 | 细美事有限公司 | Apparatus and method for mixing and supplying chemicals |
| CN102053631A (en) * | 2009-11-06 | 2011-05-11 | 徐州重型机械有限公司 | Fire-fighting foam mixing ratio control method, system and fire-fighting truck provided therewith |
-
2017
- 2017-12-27 CN CN201711443988.9A patent/CN108201798B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6719921B2 (en) * | 2000-09-29 | 2004-04-13 | Degussa Ag | Process for the continuous production of mixtures of substances and reaction mixtures and device for its implementation |
| CN1743061B (en) * | 2004-09-02 | 2010-05-12 | 细美事有限公司 | Apparatus and method for mixing and supplying chemicals |
| CN201429799Y (en) * | 2009-06-25 | 2010-03-24 | 贵阳铝镁设计研究院 | Fluid discharge flow capacity regulating device |
| CN102053631A (en) * | 2009-11-06 | 2011-05-11 | 徐州重型机械有限公司 | Fire-fighting foam mixing ratio control method, system and fire-fighting truck provided therewith |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108201798A (en) | 2018-06-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6669737B2 (en) | Low pressure fluctuation flow control apparatus and method | |
| CN108201798B (en) | Method for mixing multiple liquids in high-precision online proportion | |
| US20130105182A1 (en) | System and Method of Automatic Tank Refill | |
| US10260774B2 (en) | Low pressure drop water heating system | |
| WO2007103043A2 (en) | Liquid dispense system | |
| US11579636B2 (en) | Systems and methods for controlling operations of multi-manifold fluid distribution systems | |
| CN103090190B (en) | Chemical liquid distribution system | |
| CN107890786A (en) | A kind of more liquid on-line high accuracy hybrid systems | |
| US11313584B2 (en) | Zero pressure drop water heating system | |
| CN209026969U (en) | A kind of waterway control system of heat pump unit | |
| CN207838735U (en) | A kind of more liquid on-line high-precision hybrid systems | |
| CN203253406U (en) | Conveying pump station for solution mixing | |
| JP2000015069A (en) | Continuous preparation apparatus for liquid composition and preparation of liquid composition | |
| CN210739983U (en) | Diluent filling system | |
| CN203131430U (en) | Distribution system of chemical liquid | |
| CN112823865A (en) | Gas-liquid mixing regulation and control system and regulation and control method | |
| CN107998976B (en) | Alkali liquor preparation system | |
| CN103230759A (en) | Solution mixing and conveying pump station | |
| CN103977740A (en) | Material mixing system | |
| US20210106960A1 (en) | Gas-liquid mixing control system and control method for gas-liquid mixing | |
| CN101876822A (en) | Automatic control method for polyethenoxy ether production equipment | |
| CN111918523A (en) | Refrigeration system, control method and device of refrigeration system and storage medium | |
| CN115634403B (en) | Foam mixing device, system, foam fire engine and method | |
| CN111151034B (en) | Flow regulating device and mixer-settler | |
| TWI774041B (en) | Gas-liquid mixing control system and control method |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |