Constant pressure flow rate regulation centrifugal fan

Abstract

The invention provides a constant pressure flow rate regulation centrifugal fan. The fan comprises a fan body, an impeller assembly, a motor, a transmission device, a regulation device and a baffle. The impeller assembly is arranged inside the fan body. The baffle is arranged horizontally at an air outlet of the fan body. The regulation device is connected with the baffle through wormgear transmission. The baffle moves horizontally at the air outlet of the fan body through the regulation device. The transmission device comprises a group of transmission wheels and a transmission chain arrangedon the transmission wheels. One transmission wheel is connected with an output shaft of the motor, and the other transmission wheel is connected with the regulation device. According to the constant pressure flow rate regulation centrifugal fan, under the condition that the fan pressure is unchanged, by regulating the opening degree of the baffle, the requirement that the flow rate tends to be changed linearly is met. The centrifugal fan is simple in structure, is composed of simple mechanical components basically, and is convenient to maintain and replace; the cost and maintenance cost are greatly lowered; and meanwhile, the centrifugal fan has the characteristic of being easy to operate during practical using, and is convenient and practical, and the centrifugal fan has the high using value in the practical production process.

Description

technical field [0001] The invention relates to the field of mechanical equipment, in particular to a centrifugal fan with constant pressure flow regulation. Background technique [0002] Nowadays, the performance adjustment of centrifugal fans in industry has the following types: inlet and outlet throttling adjustment, inlet diversion adjustment, diffuser blade adjustment and variable speed adjustment, etc., which are characterized by different effects on the performance of centrifugal fans. [0003] In many production processes, fans are required to output flow and pressure suitable for the production process at any time to meet the needs of the production process. For example, when it is necessary to ensure that the outlet pressure of the fan is constant, when only the flow needs to be adjusted, there are certain problems in various current adjustment methods. The flow rate of the variable frequency speed regulating fan decreases in direct proportion to the speed ratio, w...

AI Technical Summary

Problems solved by technology

The adjustment flow rate between 100% opening and 50% opening in the early stage of the valve changes little, and then in the small opening state of the valve, the resistance increases rapidly after fine-tuning the opening, resulting in a rapid decrease in the output flow of the fan. The should-type problem is not the best solution, and there is an optimization discussion on the adjustment method

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