Valve capable of automatically controlling air volume

Abstract

The invention relates to the technical field of laboratory equipment, in particular to a valve capable of automatically controlling air volume. The valve comprises air pressure sensors, air flow acceleration sensors, venturi valves, pressure transmitters, a variable frequency controller and a controller. Each branch pipe is connected with one venturi valve in series, and the pressure transmittersare arranged in a main pipe; the air pressure sensors and the air flow acceleration sensors of each indoor space are connected in series with the venturi valves in the branch pipe corresponding to theindoor space through signal wires; and the air pressure sensors, the air flow acceleration sensors, the Venturi valves, the pressure transmitters and the variable frequency controller are connected with the controller through signal wires. A traditional butterfly valve is replaced with the venturi valve, and due to the fact that the pressure of the venturi valve is irrelevant, when the air volumeof the main pipe changes, the indoor space cannot be greatly affected.

Description

technical field [0001] The invention relates to the technical field of laboratory equipment, in particular to a valve for automatically controlling air volume. Background technique [0002] Negative pressure chambers, fume hoods, and ultra-clean workbenches in the laboratory all need to be stabilized, that is, through dynamic control of the air volume, to achieve the effect of stable internal air pressure and airflow. In the prior art, a butterfly valve with air volume control function is usually used to realize this function, but there are defects. [0003] The first point is that the butterfly valve will be disturbed by the pressure change in the main pipe, and it is known that the pressure in the main pipe is affected by various factors, which is inevitable. Therefore, there will always be inexplicable sudden changes in wind pressure in the prior art, which may have a negative impact on the experimental work. Negative Effects; [0004] The second point is that the butte...

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Problems solved by technology

[0003] The first point is that the butterfly valve will be disturbed by the pressure change in the main pipe, and it is known that the pressure in the main pipe is affected by various factors, which is inevitable. Therefore, there will always be inexplicable sudden changes in wind pressure in the prior art, which may have a negative impact on the experimental work. Negative Effects;

[0004] The second point is that the butterfly valve needs to be equipped with a front air pressure sensor to sense the pressure in the main pipe, so as to calculate the opening degree of the regulating actuator by using the wind pressure difference between the front and rear ends. Since the pressure in the main pipe is not very stable, the adjustment process cumbersome and delayed