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Device for measuring a main fluid flow through a ventilation installation

IP.com Disclosure Number: IPCOM000240363D
Publication Date: 2015-Jan-27

Publishing Venue

The IP.com Prior Art Database

Abstract

A sensor adaptor element for a differential pressure sensor, the sensor adaptor element being attachable to a ventilation installation, having a base element, and comprising or being adapted to create with a casing of the installation a pressure tapping duct with an inlet opening and with pressure tapping ports for probing local pressures in the duct. The pressure tapping duct comprises an outlet opening that may be placed in a main fluid flow entering the ventilation installation such that a Venturi effect occurs and sucks fluid into the inlet opening and through said pressure tapping duct. The invention further relates to a mass flow sensor and a ventilation installation with such a sensor adaptor element.

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TITLE

Device for measuring a main fluid flow through a ventilation installation

ABSTRACT

A sensor adaptor element for a differential pressure sensor, the sensor adaptor element being attachable to a ventilation installation, having a base element, and comprising or being adapted to create with a casing of the installation a pressure tapping duct with an inlet opening and with pressure tapping ports for probing local pressures in the duct. The pressure tapping duct comprises an outlet opening that may be placed in a main fluid flow entering the ventilation installation such that a Venturi effect occurs and sucks fluid into the inlet opening and through said pressure tapping duct. The invention further relates to a mass flow sensor and a ventilation installation with such a sensor adaptor element.

TECHNICAL FIELD

The present invention relates to a device for measuring a main fluid flow through a ventilation installation, more particularly to a sensor adaptor element for coupling a differential pressure sensor element to a centrifugal fan's casing such that a differential pressure between a point in the vicinity of a suction opening of the fan and ambient pressure may be determined.

SUMMARY OF THE INVENTION

It is an object of the present invention to provide an improved sensor adaptor element for coupling a differential pressure sensor element to a ventilation installation for measuring a total main fluid flow through the ventilation installation more accurately.

    Said sensor adaptor element for a differential pressure sensor is attachable to or integrated in a ventilation installation, in particular to a centrifugal fan. The sensor adaptor element comprises a base element, and further comprises or is further adapted to create with a casing of the ventilation installation a pressure tapping duct. The pressure tapping duct comprises an inlet opening and first and second pressure tapping ports for probing with the differential pressure sensor local pressures in said pressure tapping duct. The first pressure tapping port is disposed downstream of the second pressure tapping port. Furthermore, the


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sensor adaptor element comprises an outlet opening that may be placed in a main fluid flow entering the ventilation installation such that a Venturi effect occurs at the outlet opening causing an under pressure in at least part of said pressure tapping duct, wherein, preferably, fluid is sucked into the inlet opening and through said pressure tapping duct. Accordingly, the differential pressure sensor attachable to the sensor adaptor element may determine the pressure difference between the two tapping ports, wherein the pressure difference is associated with or a direct measure of the main fluid flow.

    The under pressure is an under pressure that may be measured by conventional differential pressure sensors such as flow-through or static membrane sensors.

    In some preferred embodiments, the sensor adaptor element further comprises...