Flow sensing module with bypass

Abstract

The present invention discloses a flow sensing module comprising a body portion and a flow sensor. The body portion includes a main fluid inlet; a main fluid outlet, and a main fluid passage extending between the main fluid inlet and the main fluid outlet; a bypass fluid inlet communicating with the main fluid passage at a second position upstream of the main fluid outlet; a bypass fluid outlet communicating with the main fluid passage at a first position downstream of the main fluid inlet, wherein the first position is upstream of the second position; and a bypass fluid passage extending between the bypass fluid inlet and the bypass fluid outlet. The flow sensor is exposed to a bypass fluid passage for sensing the flow or flow rate of the fluid in the bypass passage, and the flow or flow rate of the fluid in the bypass passage is related to the flow or flow rate of the main fluid passage. The present invention does not provide a flow blocking member within the main fluid passage so as to have a very low pressure drop and also to increase the linearity and sensitivity of the flow sensing module.

Description

[0001] 【Technical field】 [0002] The invention relates to the field of flow sensors, in particular to a flow sensing module with a bypass. [0003] 【Background technique】 [0004] Flow sensors are commonly used to sense the flow of fluid, such as gas or liquid, flowing through a fluid channel. Such flow sensors are commonly used in a wide variety of applications such as medical applications, flight control applications, industrial process applications, combustion control applications, weather monitoring applications, and many others. Because individual application requirements are different, different types of fluid sensors are required. The perfect sensor for a ventilator in an ICU (Intensive Care Unit) may not be perfect for a gas leak detection system. Traditional flow meters, such as hot-wire anemometers, typically use a lot of energy. Traditional MEMS flowmeters with a bypass usually set a blocking member between the inlet and outlet of the bypass fluid channel in the ...

AI Technical Summary

Problems solved by technology

The perfect sensor for a ventilator in the ICU (Intensive Care Unit) may not meet the requirements of a gas leak detection system

Traditional flow meters, such as hot wire anemometers, typically use a lot of energy

Traditional MEMS flowmeters with a bypass usually set a blocking member between the inlet and outlet of the bypass fluid channel in the main fluid channel to guide the fluid into the bypass fluid channel, which results in a larger pressure. damage

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