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An automatic foam proportional mixing digital display controlling module

A technology of proportional mixing and control module, applied in various fluid ratio control, mixer, dissolution and other directions, can solve the problems affecting the accuracy of terminal liquid output ratio, dynamic deviation of system characteristics, inconvenient use, etc., to improve system reliability, The effect of reducing performance requirements and improving adaptability

Inactive Publication Date: 2009-09-30
SHANGHAI FIRE RES INST OF THE MIN OF PUBLIC SECURITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In actual use, due to individual differences in the manufacture of foam pumps, on-site installation pipeline characteristics, water supply circuit pressure fluctuations, and long-term wear and tear, etc., resulting in dynamic deviations in system characteristics and affecting the proportional accuracy of the terminal liquid outlet, so only rely on speed feedback There is a certain systematic error in the control of one parameter
This not only requires the pump equipment to have good consistency and stability, but also requires regular system calibration and professional maintenance operators, which brings inconvenience to use

Method used

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  • An automatic foam proportional mixing digital display controlling module
  • An automatic foam proportional mixing digital display controlling module
  • An automatic foam proportional mixing digital display controlling module

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1, its structure is as image 3 As shown, the water flowmeter 11 adopts an electromagnetic flowmeter and is installed in the water supply circuit 23 , and the liquid level sensor 13 adopts a reed type liquid level switch and is installed in the foam liquid tank 21 . The microcomputer control unit 1 is connected to the water flow meter 11 through the RS485 interface, connected to the DC brushless motor driver 15 through the 0-5V analog output interface and the 0-12V pulse input interface, and connected to the electronic control valve driver 16 through the 0-5V analog input and output interface, The liquid level sensor 13 is connected through the 0-10V interface, and the display operating mechanism 5 adopts an 8-digit liquid crystal digital display. The water flow parameter and the motor speed parameter form a single-parameter feedback closed-loop control loop, and the microcomputer control unit 1 stores the speed and flow characteristic curve parameters and th...

Embodiment 2

[0039] Embodiment 2: its structure is as Figure 4 As shown, the water flow meter 11 adopts a differential pressure flow meter and is installed in the water supply circuit 23 , and the liquid level sensor 13 adopts a photoelectric liquid level switch and is installed in the foam liquid tank 21 . The microcomputer control unit 1 is connected to the differential pressure flowmeter through the 4-20mA interface, connected to the turbine foam flowmeter 12 through the 0-10V pulse input interface, connected to the 0-5V analog output interface, and 0-12V pulse input interface to the DC brushless motor driver 15. Connect the liquid level sensor 13 through the 0-5V interface, and the display operating mechanism 5 adopts a 640×480 dot matrix color liquid crystal display. The water flow parameter, the foam flow parameter and the speed parameter of the foam pump unit 20 constitute a double-parameter feedback closed-loop control loop. In actual work, the water supply flow rate reaches the ...

Embodiment 3

[0040] Embodiment 3: as Figure 5 As shown, the water flowmeter 11 adopts a turbine flowmeter and is installed in the water supply circuit 23 , and the liquid level sensor 13 adopts a Hall type liquid level switch and is installed in the foam liquid tank 21 . The microcomputer control unit 1 is connected to the turbine flowmeter through the 0-10V pulse input interface, connected to the pressure sensor 14 through the 0-5V interface, connected to the Hall type liquid level switch through the 0-10V interface, and connected to the DC brushless motor driver 15 through the RS485 interface , Connect the electronically controlled valve driver 16 through the 0-5V interface, and the display operating mechanism 5 adopts an 8-digit LED digital display. Water flow parameters, outlet pipeline pressure parameters and motor speed parameters constitute a dual-parameter feedback closed-loop control loop. The microcomputer control unit pre-stores the rotational speed and flow characteristic cur...

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Abstract

The present invention pertains to the field of firefighting equipment, concretely relates to an automatic foam proportional mixing digital display controlling module and consists of microcomputer control unit, sensor unit and driver unit. The microcomputer control unit consists of circuit board component, electric signal connector, display and operating mechanism, and housing. They are overlapped in the housing. The circuit board component consists of microprocessor, electric signal input interface, electric signal output interface and digital communication interface. The electric signal connector and the display and operating mechanism are inside the housing; the sensor unit includes water flowmeter, foam flowmeter, and one or several types of level sensor or pressure sensor; the driver unit includes one or several types of DC brushless motor driver and electric valve driver; the electric signal input interface, electric signal output interface and digital communication interface of the electric circuit component are connected to the sensing component of the sensor unit and the driving component of the driver unit with electric signal connector. The present invention may greatly raise the automation degree of proportional foam mixing, and realize accurate control and adjustment of less than 1% mixing proportion.

Description

technical field [0001] The invention belongs to the technical field of fire-fighting equipment, and in particular relates to a foam automatic proportional mixing digital display control module. Background technique [0002] Compressed Air Foam Fire Extinguishing System (CAFS) is the most advanced fire extinguishing technology and equipment in the world. At the fire scene, affected by the fluctuation of water pressure and flow, the foam mixing ratio will deviate, which will affect the fire extinguishing efficiency. It needs to be adjusted in time according to the change of water flow during use, and the appropriate percentage will be automatically maintained. In recent years, some CAFS equipment technology products have been successfully developed in China, but most of them adopt the mechanical proportion mixing method. Only the mixed proportion of the electronically controlled foam automatic mixing device is reported to be between 3-7%, which is only suitable for B Foam-lik...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62C5/02B01F15/04G05D11/13
Inventor 薛林王丽晶张振伟李炳泉田永祥王志辉严攸高张杰
Owner SHANGHAI FIRE RES INST OF THE MIN OF PUBLIC SECURITY
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