CN203010761U - Heating and energy-saving control system for central heating public buildings - Google Patents
Heating and energy-saving control system for central heating public buildings Download PDFInfo
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- CN203010761U CN203010761U CN 201220505030 CN201220505030U CN203010761U CN 203010761 U CN203010761 U CN 203010761U CN 201220505030 CN201220505030 CN 201220505030 CN 201220505030 U CN201220505030 U CN 201220505030U CN 203010761 U CN203010761 U CN 203010761U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
Abstract
The utility model relates to the technical field of heating and energy conservation, and provides a heating and energy-saving control system for central heating public buildings. The heating and energy-saving system for the central heating public buildings comprises a heat source control device, a pump room control device, a pipe network monitoring device and a heating general control server, wherein the heating general control server is connected with the heat source control device, the pump room control device and the pipe network monitoring device. Overall monitoring and adjustment from a heat source to a heating supply network can be achieved, the system can conform needed thermal load of a room in real time according to change of indoor and outdoor temperature, air quantity, an air speed, sunlight, personnel, lighting and an on-off state of devices, and real-time adjustment of the thermal load can be achieved. Meanwhile, heat which is supplied for users by heat hot water in the heating supply network can be adjusted in real time, the problem of disorder of water conservancy is solved, and the problems that a near-end is hot and a far-end is cold in the prior art are completely solved.
Description
Technical field
The utility model belongs to the heating energy technical field, relates in particular to a kind of central heating public building heat supply energy-saving control system.
Background technology
At present, the central heating system of public building mostly exists great waste and heat distribution energy imbalance, and its major defect has: the thermal source design heating load is excessive, and pipe network is excessively thick; The system automation level is low, and the monitoring effect of low level is just played by Surveillance center; The experience that in heating system take boiler as thermal source, the operation of boiler mainly relies on the fireman is regulated boiler operating parameter, do not have scientific and reasonable foundation to calculate dynamic thermal load, and regulate accordingly boiler and pipe network operation parameter, heating system heating amount take heat exchange station as thermal source is excessive, can not be according to each hot user's actual conditions heating according to need; Can not disturb in time adjustment thermic load of variation according to outside air temperature variation and Indoor Thermal, thermal source was operated under identical conditions in one day all the time, cause a large amount of wastes of heat and electric power equal energy source; There is the problem of hydraulic misadjustment in most heating network, fluid flow calculating method science not in pipe network, and control method falls behind single, forms the phenomenon of " near-end heat, far-end cold ", has wasted a large amount of electric power.
Summary of the invention
The purpose of this utility model is to provide a kind of central heating public building heat supply energy-saving control system, and the central heating system that being intended to solve prior art provides mostly exists the problem of great waste and heat distribution energy imbalance.
The utility model is achieved in that a kind of central heating public building heat supply energy-saving control system, and described system comprises:
Real Time Monitoring thermal source operational factor, the quantity of heat given up of control of heat source is completed the data interaction with field instrument and control appliance simultaneously, and exports the heat source control of the parameter that described field instrument collects;
Gather the hot water flow data of pipe network and the operational factor of circulating pump and small pump, and described circulating pump and described small pump are controlled accordingly and regulated, the pump house control device of the hot water flow data of the described pipe network that output simultaneously collects and the operational factor of described circulating pump and described small pump;
Supply water temperature, return water temperature to hot water in indoor temperature, pipe network gather, and control the aperture of flow control valve with this, the supply water temperature of hot water, the pipe-network monitoring device of return water temperature in the indoor temperature that output simultaneously collects, pipe network;
Be connected with described heat source control, described pump house control device and the pipe-network monitoring device of being connected respectively, be used for receiving the relevant parameter of described heat source control, described pump house control device and the output of described pipe-network monitoring device, and according to described relevant parameter, calculate the needed thermic load of building, to described heat source control, described pump house control device and described pipe-network monitoring device output control instruction, with the heating master control server of the duty of regulating described heat source control, described pump house control device and described pipe-network monitoring device;
Described heating master control server comprises the first industry control server and the second industry control server that is connected with described the first industry control server communication;
As a kind of improved plan, described heat source control specifically comprises:
The first display unit that shows the field data of thermal source;
To comprise temperature, pressure, flow transducer signal and control and feedback signal convert digital quantity signal to, simultaneously, control command is converted to corresponding analog signal assigns the first analog quantity processing unit to described transmitter and electric operator;
To the startup of motor and the switching value control module that stops controlling;
According to thermal source operating load and operational factor, control the frequency conversion power saving unit of motor electricity consumption frequency;
With the temperature and pressure signal that detects, be converted to the Site Detection instrument of the 4-20mA current signal of standard, described Site Detection instrument comprises pressure transmitter and temperature transmitter;
Electric operator comprises YE and frequency converter;
respectively with described display unit, described the first analog quantity processing unit, described switching value control module, described frequency conversion power saving unit, described Site Detection instrument be connected electric operator and connect, receive described the first analog quantity processing unit, described switching value control module, described frequency conversion power saving unit, the running parameter of described Site Detection instrument and described electric operator, and to described the first display unit, described analog quantity processing unit, described switching value control module, described frequency conversion power saving unit, the one CPU control module of described Site Detection instrument and described electric operator output control instruction,
A described CPU control module is connected with described the first industry control server communication.
As a kind of improved plan, described pump house control device specifically comprises the 2nd CPU control module, the second display unit, circulating pump control module and small pump control module, wherein:
Described the second display unit comprises the operational factor of real-time demonstration circulating pump and small pump, and receives the site operation personnel and the running status of circulating pump and small pump is carried out the touch-screen that manually arranges and the on-the-spot ultrasonic signal of flowmeter collection is calculated convert the ultrasonic flowmeter digital display meter that instantaneous delivery and integrated flow show to;
Described circulating pump control module and described small pump control module comprise that the power frequency that realizes circulating pump and converting operation switch, the power controller spare of the switching of active and standby circulating pump and frequency-variable energy-saving device that circulating pump and small pump are carried out the level and smooth startup of variable frequency regulating speed control and motor;
Be connected with described the second display unit, described circulating pump control module and the small pump control module of being connected, gather the data on flows of pipe network and voltage, electric current, frequency and the rotary speed data of circulating pump and small pump, and described the 2nd CPU control module that described circulating pump and small pump are controlled accordingly and regulated;
Described the 2nd CPU control module is connected with described the first industry control server.
As a kind of improved plan, described pipe-network monitoring device specifically comprises:
Gather the second analog quantity processing unit of the signal of supply water temperature, return water temperature and performance element in indoor temperature, pipe network;
Be connected with described the second analog quantity processing unit, the signal of supply water temperature, return water temperature, indoor temperature and the performance element of described the second analog quantity processing unit carried out conversion process, and control the 3rd CPU control module of the aperture of flow control valve with this;
Be connected with the 3rd CPU control module with the second analog quantity processing unit respectively, according to the control signal of described the 3rd CPU control module, regulate the performance element of pipe network valve opening;
Be connected with described the 3rd CPU control module, the parameter signal that described the 3rd CPU control module was processed sends to described the second industry control server, and receives the wireless communication unit that described the second industry control server sends to control instruction;
Be connected the 3rd display unit that the signal of supply water temperature, return water temperature and performance element in described indoor temperature, pipe network is shown with described the 3rd CPU control module.
in the utility model, central heating public building heat supply energy-saving control system comprises heat source control, the pump house control device, pipe-network monitoring device, integral monitoring and the adjusting of realization from the thermal source to the heating network, system is in real time according to variation and the air quantity of indoor and outdoor temperature, wind speed and sunshine, personnel, the on off state of illumination and equipment is determined the required thermic load in room, realize the real-time adjusting of thermic load, simultaneously, in real-time adjustment pipe network, hot water can be supplied with user's heat, solved the problem of water conservancy imbalance, thoroughly change " near-end heat of the prior art, far-end is cold " problem.
Description of drawings
Fig. 1 is the framework schematic diagram of the central heating public building heat supply energy-saving control system that provides of the utility model;
Fig. 2 is the structured flowchart of the heat source control that provides of the utility model;
Fig. 3 is the structured flowchart of the pump house control device that provides of the utility model;
Fig. 4 is the structured flowchart of the pipe-network monitoring device that provides of the utility model.
The specific embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
Fig. 1 shows the framework schematic diagram of the central heating public building heat supply energy-saving control system that the utility model provides, and for convenience of explanation, has only provided the part relevant to the utility model in figure.
The central heating public building heat supply energy-saving control system that the utility model provides specifically comprises heat source control 1, pump house control device 2, pipe-network monitoring device 3 and heating master control server 4, and it is specially:
Heat source control 1 is used for Real Time Monitoring thermal source operational factor, and the quantity of heat given up of control of heat source is completed simultaneously the data interaction with field instrument and control appliance, and exported the parameter that described field instrument collects;
Pump house control device 2, be used for gathering the hot water flow data of pipe network and the operational factor of circulating pump and small pump, and circulating pump and small pump are controlled accordingly and regulated, the hot water flow data of the described pipe network that output simultaneously collects and the operational factor of circulating pump and small pump;
Pipe-network monitoring device 3 is used for indoor temperature, the supply water temperature of pipe network hot water, return water temperature are gathered, and controls the aperture of flow control valve with this, simultaneously, and supply water temperature, the return water temperature of hot water in the indoor temperature that output collects, pipe network;
Heating master control server 4, are connected with pipe-network monitoring device with heat source control 1, pump house control device 2 respectively and are connected, be used for receiving the relevant parameter of heat source control 1, pump house control device 2 and pipe-network monitoring device 3 outputs, and according to described relevant parameter, calculate the needed thermic load of building, heat source control device, pump house control device and pipe-network monitoring device output control instruction are to regulate the duty of heat source control, pump house control device and pipe-network monitoring device.
As a specific embodiment of the present utility model, the heating master control server shown in Fig. 1 comprises two parts, and the first industry control server 41 and the second industry control server 42 are specially:
The first industry control server 41, be used for moving thermal source heated monitoring software, thermal source, circulating pump, small pump, field controller operational factor relevant with the indoor temperature capture card are shown, the real-time running state of each subsidiary engine of description heating system of dynamic simulation, adopt pid control algorithm, calculate in real time operational factor and the running status of the field device that comprises thermal source, circulating pump, small pump, and export described operational factor to field device;
The second industry control server 42 is used for operation Intelligent pipe net monitoring software, and the indoor temperature of monitoring point in the heating data of Real-time Collection pipe network and different chamber is carried out remote monitoring to each pipe-network monitoring device;
The first industry control server 41 be connected 42 communications of industry control server and connect.
Certainly, in the present embodiment, also can adopt a station server to control, but not in order to limit the utility model.
As an embodiment of the present utility model, Fig. 2 shows the structured flowchart of the heat source control that the utility model provides, and for convenience of explanation, has only provided the part relevant to the utility model in figure.
Heat source control 1 specifically comprises the first display unit 11, the first analog quantity processing unit 12, switching value control module 13, frequency conversion power saving unit 14, Site Detection instrument 15, electric operator 16 and a CPU control module 17, wherein:
The first display unit 11 is for the field data that shows thermal source;
The first analog quantity processing unit 12, be used for comprising temperature, pressure, flow transducer signal and control and feedback signal convert digital quantity signal to, simultaneously, control command being converted to corresponding analog signal assigns to described transmitter and electric operator;
Switching value control module 13 is used for the startup of motor and stops controlling;
Frequency conversion power saving unit 14 is used for according to thermal source operating load and operational factor, controls motor electricity consumption frequency;
The one CPU control module 17, are connected with electric operator with display unit 11, the first analog quantity processing unit 12, switching value control module 13, frequency conversion power saving unit 14, Site Detection instrument 15 respectively and are connected, receive the running parameter of the first analog quantity processing unit 12, switching value control module 13, frequency conversion power saving unit 14, Site Detection instrument 15 and electric operator 16, and to the first display unit 11, analog quantity processing unit 12, switching value control module 13, frequency conversion power saving unit 14, Site Detection instrument 15 and electric operator 16 output control instructions;
The one CPU control module 17 is connected with the first industry control server 41 communications.
Certainly, in this embodiment, this heat source control 1 also comprises miscellaneous part, do not repeat them here, but not in order to limit the utility model.
As an embodiment of the present utility model, Fig. 3 shows the structured flowchart of the pump house control device that the utility model provides, and for convenience of explanation, has only provided the part relevant to the utility model in figure.
Pump house control device 2 specifically comprises the 2nd CPU control module 21, the second display unit 22, circulating pump control module 23 and small pump control module 24, wherein:
The second display unit 22 comprises touch-screen and ultrasonic flowmeter digital display meter (not providing in figure), touch-screen shows the operational factor of circulating pump and small pump in real time, and receive the site operation personnel running status of circulating pump and small pump is manually arranged, the ultrasonic flowmeter digital display meter calculates the on-the-spot ultrasonic signal of flowmeter collection and converts instantaneous delivery to and integrated flow shows;
Circulating pump control module 23 and small pump control module 24 comprise power controller spare and frequency-variable energy-saving device (not providing in figure), control device realizes that the power frequency of circulating pump and converting operation switch, the switching of active and standby circulating pump, and frequency-variable energy-saving device carries out the level and smooth startup of variable frequency regulating speed control and motor to circulating pump and small pump;
The 2nd CPU control module 21 is connected with the small pump control module with display unit 22, circulating pump control module 23 and is connected, be used for gathering the data on flows of pipe network and voltage, electric current, frequency and the rotary speed data of circulating pump and small pump, and described circulating pump and small pump are controlled accordingly and regulated;
The 2nd CPU control module 24 is connected with the first industry control server 41.
In the present embodiment, this pump house control device 2 is connected with small pump with circulating pump, and circulating pump and small pump are controlled, and certainly, this device also may comprise miscellaneous part, do not repeat them here, but not in order to limit the utility model.
As an embodiment of the present utility model, Fig. 4 shows the structured flowchart of the pipe-network monitoring device that the utility model provides, and for convenience of explanation, has only provided the part relevant to the utility model in figure.
Pipe-network monitoring device 3 specifically comprises the 3rd CPU control module 31, the 3rd display unit 32, the second analog quantity processing unit 33, performance element 34 and wireless communication unit 35, wherein:
The second analog quantity processing unit 33 is for the signal that gathers indoor temperature, pipe network supply water temperature, return water temperature and performance element;
The 3rd CPU control module 31 is connected with the second analog quantity processing unit 33, the signal of supply water temperature, return water temperature, indoor temperature and the performance element 34 of the second analog quantity processing unit 33 is carried out conversion process, and control the aperture of flow control valve with this;
The 3rd display unit 32 is connected with the 3rd CPU control module 31, and the signal of supply water temperature, return water temperature and performance element 34 in indoor temperature, pipe network is shown.
Above-mentioned wireless communication unit 35 is connected with the second industry control server 42 communications.
In the present embodiment, this pipe-network monitoring device 3 can also comprise miscellaneous part, do not repeat them here, but not in order to limit the utility model.
In the utility model, the building of dissimilar different purposes is different the different periods with heat demand.this central heating public building heat supply energy-saving control system adopts the timesharing district heating can reduce the heat waste that the heating of building whole day constant temperature causes, the timesharing district heating be dissimilar according to building and national or local regulation use hot standard, set daytime the indoor temperature scope and night the indoor temperature scope, reach and not only satisfy with heat demand but also energy-conservation purpose, in system, setting value at room temperature is not a determined value, but the reason of setting within the specific limits is when satisfying the warm demand of people's use, avoid heat regulation frequently, keep system stability, extend lifetime of system.
Wherein, the timesharing district heating is to set the indoor temperature temperature range of every solitary building by heating master control server, calculates the real-time thermic load value of this period according to the calculation of Heat Load model.Office building for example, the time that works by day normally heats, in time of having a rest at night building as long as keep antifreeze temperature or temperature on duty.Consider the thermo-lag of heating system, native system recovered normal heating in advance before normally with the hot period, and the precooling of lowering the temperature before the stage on duty, had guaranteed the comfort level of heating, reduced simultaneously heating energy consumption.Suppose 8 formal offices of beginning in office building, for guaranteeing heating quality, begin normal heating after 6, be the building preheating.When coming off duty in the afternoon, also will be for building carry out precooling, in the building 6 formally enter the phase on duty to knocking off at six afternoon 5, for cutting the waste, carry previous hour and namely reduce the heating amount, indoorly in the time of 6 reach temperature on duty.
in the utility model, central heating public building heat supply energy-saving control system comprises heat source control, the pump house control device, pipe-network monitoring device and heating master control server, integral monitoring and the adjusting of realization from the thermal source to the heating network, system is in real time according to variation and the air quantity of indoor and outdoor temperature, wind speed and sunshine, personnel, the on off state of illumination and equipment is determined the required thermic load in room, realize the real-time adjusting of thermic load, simultaneously, in real-time adjustment pipe network, hot water can be supplied with user's heat, solved the problem of water conservancy imbalance, thoroughly change " near-end heat of the prior art, far-end is cold " problem.
The above is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection domain of the present utility model.
Claims (4)
1. a central heating public building heat supply energy-saving control system, is characterized in that, described system comprises:
Real Time Monitoring thermal source operational factor, the quantity of heat given up of control of heat source is completed the data interaction with field instrument and control appliance simultaneously, and exports the heat source control of the parameter that described field instrument collects;
Gather the hot water flow data of pipe network and the operational factor of circulating pump and small pump, and described circulating pump and described small pump are controlled accordingly and regulated, the pump house control device of the hot water flow data of the described pipe network that output simultaneously collects and the operational factor of described circulating pump and described small pump;
Supply water temperature, return water temperature to hot water in indoor temperature, pipe network gather, and control the aperture of flow control valve with this, simultaneously, and the supply water temperature of hot water, the pipe-network monitoring device of return water temperature in the indoor temperature that output collects, pipe network;
Be connected with described heat source control, described pump house control device and the pipe-network monitoring device of being connected respectively, be used for receiving the relevant parameter of described heat source control, described pump house control device and the output of described pipe-network monitoring device, and according to described relevant parameter, calculate the needed thermic load of building, to described heat source control, described pump house control device and described pipe-network monitoring device output control instruction, with the heating master control server of the duty of regulating described heat source control, described pump house control device and described pipe-network monitoring device;
Described heating master control server comprises the first industry control server and the second industry control server that is connected with described the first industry control server communication.
2. central heating public building heat supply energy-saving control system according to claim 1, is characterized in that, described heat source control specifically comprises:
The first display unit that shows the field data of thermal source;
To comprise temperature, pressure, flow transducer signal and control and feedback signal convert digital quantity signal to, simultaneously, control command is converted to corresponding analog signal assigns the first analog quantity processing unit to described transmitter and electric operator;
To the startup of motor and the switching value control module that stops controlling;
According to thermal source operating load and operational factor, control the frequency conversion power saving unit of motor electricity consumption frequency;
With the temperature and pressure signal that detects, be converted to the Site Detection instrument of the 4-20mA current signal of standard, described Site Detection instrument comprises pressure transmitter and temperature transmitter;
Electric operator comprises YE and frequency converter;
respectively with described display unit, described the first analog quantity processing unit, described switching value control module, described frequency conversion power saving unit, described Site Detection instrument be connected electric operator and connect, receive described the first analog quantity processing unit, described switching value control module, described frequency conversion power saving unit, the running parameter of described Site Detection instrument and described electric operator, and to described the first display unit, described analog quantity processing unit, described switching value control module, described frequency conversion power saving unit, the one CPU control module of described Site Detection instrument and described electric operator output control instruction,
A described CPU control module is connected with described the first industry control server communication.
3. central heating public building heat supply energy-saving control system according to claim 1, is characterized in that, described pump house control device specifically comprises the 2nd CPU control module, the second display unit, circulating pump control module and small pump control module, wherein:
Described the second display unit comprises the operational factor of real-time demonstration circulating pump and small pump, and receives the site operation personnel and the running status of circulating pump and small pump is carried out the touch-screen that manually arranges and the on-the-spot ultrasonic signal of flowmeter collection is calculated convert the ultrasonic flowmeter digital display meter that instantaneous delivery and integrated flow show to;
Described circulating pump control module and described small pump control module comprise that the power frequency that realizes circulating pump and converting operation switch, the power controller spare of the switching of active and standby circulating pump and frequency-variable energy-saving device that circulating pump and small pump are carried out the level and smooth startup of variable frequency regulating speed control and motor;
Be connected with described display unit, described circulating pump control module and the small pump control module of being connected, gather the data on flows of pipe network and voltage, electric current, frequency and the rotary speed data of circulating pump and small pump, and described the 2nd CPU control module that described circulating pump and described small pump are controlled accordingly and regulated;
Described the 2nd CPU control module is connected with described the first industry control server.
4. central heating public building heat supply energy-saving control system according to claim 1, is characterized in that, described pipe network control device specifically comprises:
Gather the second analog quantity processing unit of the signal of supply water temperature, return water temperature and performance element in indoor temperature, pipe network;
Be connected with described the second analog quantity processing unit, the signal of supply water temperature, return water temperature, indoor temperature and the performance element of described the second analog quantity processing unit carried out conversion process, and control the 3rd CPU control module of the aperture of flow control valve with this;
Be connected with the 3rd CPU control module with the second analog quantity processing unit respectively, according to the control signal of described the 3rd CPU control module, regulate the performance element of pipe network valve opening;
Be connected with described the 3rd CPU control module, the parameter signal that described the 3rd CPU control module was processed sends to described the second industry control server, and receives the wireless communication unit that described the second industry control server sends to control instruction;
Be connected the 3rd display unit that the signal of supply water temperature, return water temperature and performance element in described indoor temperature, pipe network is shown with described the 3rd CPU control module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220505030 CN203010761U (en) | 2012-09-28 | 2012-09-28 | Heating and energy-saving control system for central heating public buildings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220505030 CN203010761U (en) | 2012-09-28 | 2012-09-28 | Heating and energy-saving control system for central heating public buildings |
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| CN203010761U true CN203010761U (en) | 2013-06-19 |
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| CN 201220505030 Expired - Fee Related CN203010761U (en) | 2012-09-28 | 2012-09-28 | Heating and energy-saving control system for central heating public buildings |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103486641A (en) * | 2013-10-10 | 2014-01-01 | 张久明 | System and method for controlling water supplementing and softening |
| CN111895487A (en) * | 2019-05-06 | 2020-11-06 | 萨姆森控制设备（中国）有限公司 | Controller, control method, cloud platform and intelligent thermal water mixing device |
-
2012
- 2012-09-28 CN CN 201220505030 patent/CN203010761U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103486641A (en) * | 2013-10-10 | 2014-01-01 | 张久明 | System and method for controlling water supplementing and softening |
| CN103486641B (en) * | 2013-10-10 | 2015-06-24 | 张久明 | System and method for controlling water supplementing and softening |
| CN111895487A (en) * | 2019-05-06 | 2020-11-06 | 萨姆森控制设备（中国）有限公司 | Controller, control method, cloud platform and intelligent thermal water mixing device |
| CN114992707A (en) * | 2019-05-06 | 2022-09-02 | 萨姆森控制设备（中国）有限公司 | Intelligent thermal water mixing device and control method |
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