Parallel type draught fan power type variable air volume tail end device and control method thereof

Abstract

The invention provides a parallel type draught fan power type variable air volume tail end device and a control method thereof. The parallel type draught fan power type variable air volume tail end device comprises a draught fan, a primary air valve connected with the draught fan in parallel, and a direct digital controller. The draught fan comprises a motor, and the draught fan further comprises a check valve with a baffle. The baffle is fixed to the position of a draught fan air outlet of the draught fan through a rotating shaft. When the draught fan is static, the baffle is kept vertical so that primary air can be prevented from entering the draught fan through the check valve; and when the draught fan works, at least part of the baffle is opened. According to the parallel type draught fan power type variable air volume tail end device, when the draught fan is static, the primary air can be prevented from entering the draught fan through the check valve, and when the draught fan works, the baffle can be opened. Through the test, the resistance losses of the baffle can almost be ignored when the draught fan runs, abnormal noise is not generated at the position of the baffle, and constant-air-volume running of the parallel type draught fan power type variable air volume tail end device can be achieved.

Description

technical field [0001] The invention relates to a heating ventilation and air conditioning (HVAC) and a building intelligent control method, in particular to a parallel fan power variable air volume terminal device and a control method thereof. Background technique [0002] Such as figure 1 As shown, the parallel fan-powered variable air volume terminal device 10, that is, the built-in fan 12 and the primary air valve 11 in the parallel-connected FPB (Fanpowered box, fan-powered variable air volume terminal device) are arranged in parallel. The primary air processed by the AHU (Air Handle Unit) only passes through the primary air valve 11 and not the built-in fan 12, so the total air supply at the end of the parallel FPB is drawn from the primary air and the built-in fan. The internal return air is superimposed. [0003] The structural characteristics of the parallel FPB unit determine that the primary air treated by the AHU entering from the throat and the air inhaled by ...

AI Technical Summary

Problems solved by technology

However, in actual use, due to the fact that the heating coil or filter screen installed in the system will be dirty and blocked, or in order to meet the requirements of a clean environment in some areas, a higher-efficiency filter screen is installed in the system. As a result, the static pressure of the fan is too high, the air volume is attenuated, and the number of air changes in the area cannot be guaranteed

Therefore, the air volume of the fan will change with the static pressure, and the adjustment ability is limited

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