A self-adaptive control method for electric valve flow of range hood

Abstract

A method for self-adaptive control of electric valve flow of range hoods, including range hoods installed on different floors, the air outlet of each range hood is connected to the common flue through its own smoke pipe, and in each smoke pipe Electric valves with flow detection modules and power detection sockets are installed. The advantage of the present invention is that: the preset angle control method of the flue check valve of the high-rise building uses the absolute input power of the closed state of the valve body as the basis for judging the gear position, and then calculates with the flow velocity and power according to the power limit segment Feedback realizes the self-adaptive adjustment of the valve opening, so that the valve angle does not need to be preset, and the power and flow rate are automatically calculated in sections, and the control accuracy is higher.

Description

technical field [0001] The invention relates to a flow adaptive control method, in particular to a flow adaptive control method of an electric valve of a range hood. Background technique [0002] At present, the floors of newly-built buildings in cities are generally higher and higher. Since the outlets of high-rise public flues are generally set on the top of the floors, the switching status of the range hoods of each user's home will affect the resistance of the system outlet, making the smoke exhaust situation of users at the bottom poor. . In recent years, the user-side adjustable angle valve combined with the roof flue outlet main fan centralized filtration and discharge has been applied in some well-decorated buildings in recent years. The roof main fan performs frequency conversion + valve preset angle to achieve flow for users with different operating rates. Allocation, although this method can solve the poor smoke exhaust situation of bottom users to a certain exte...

AI Technical Summary

Problems solved by technology

[0002] At present, the floors of newly-built buildings in cities are generally higher and higher. Since the outlets of high-rise public flues are generally set on the top of the floors, the switching status of the range hoods of each user's home will affect the resistance of the system outlet, making the smoke exhaust situation of users at the bottom poor.

In recent years, the user-side adjustable angle valve combined with the roof flue outlet main fan centralized filtration and discharge has been applied in some well-decorated buildings in recent years. The roof main fan performs frequency conversion + valve preset angle to achieve flow for users with different operating rates. Allocation, although this method can solve the poor smoke exhaust situation of bottom users to a certain extent, and effectively control the flow rate and noise of the entire flue system, but it needs to be adjusted and adapted according to the flue of different buildings, and the same set of programs cannot be self-adaptive For many buildings, the amount of calculation before installation is particularly large, and the test of the flow rate sensor or pressure sensor fluctuates greatly under high resistance and low flow conditions, and the data cannot be directly used for judgment

[0003] According to the test, according to the CFD analysis and comparison of the open state of the valve plate, it can be seen that the velocity distribution of the flow field before and after the valve plate is extremely uneven under the state of small angle and high resistance. If only a single-point measurement or a few The flow rate obtained by point measurement and then the average value multiplied by the correction coefficient cannot accurately represent the actual flow rate

In addition, the electric valve body is an external accessory that matches the range hood, and in most cases there is no communication with the range hood body (only the valve body and range hood produced by a few manufacturers with open agreements or the same manufacturer can have communication. ), the ordinary valve body can only be opened and closed when the user turns on the machine, so for ordinary multi-position range hoods, how to identify the current gear status of the range hood at the valve body and judge the high, high, and Medium and low gears (different gears reflect the user's current cooking status and requirements for air volume and noise) have become an application problem for the adaptive valve body

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