Air flow control device with differential pressure sensing assembly and method
First Claim
1. An air flow control device with a pressure sensing assembly comprising:
- a housing formed for mounting to an air conduit and formed for the passage of air through the housing for one of discharge into and exhaust from a room; and
at least one pressure tube having at least one opening therein, the tube being mounted to the housing with the opening positioned proximate a known cross sectional area of the housing to communicate pressure at the opening into the tube, and the tube extending from the opening to an open distal end with the distal end being secured in a position accessible from a room side of the housing, and the distal end being formed for releasable coupling of a pressure measurement device to the distal end for measurement from a room side of the housing of an air pressure differential in the housing proximate the area to enable a determination of the air flow rate in the housing at the known cross sectional area.
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Accused Products
Abstract
An air flow control device, such as an air diffuser (21) with a differential pressure sensing assembly. The diffuser (21) has a housing (29) formed for mounting to a supply air conduit (22) for discharge of supply air (54) into a room (56). The differential pressure sensing assembly includes a diffuser-mounted portion (41) and a detachable sensor portion (40). The diffuser mounted portion (41) is provided by a pressure tube (42) having at least one opening (43) therein mounted to the housing (29) with the opening (43) positioned proximate an area of known cross section to communicate pressure at the opening (43) to an open distal end (46) of the tube (42). The distal end (46) is secured in a position accessible from a room side (51) of the housing (29). The distal end (46) of the tube (42) is formed for releasable coupling of the detachable sensor portion (40) of the differential pressure sensing assembly thereto, and the sensor portion includes a differential pressure measurement device (61) for measurement of the difference between the supply air pressure in the diffuser (21) at the known area and the ambient room air pressure. This measurement is made from a room side (51) of the housing (29) and allows a determination of the supply air flow rate through the diffuser to be made. A method of measuring air flow rate in an air flow control device (21) is also disclosed.
28 Citations
28 Claims
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1. An air flow control device with a pressure sensing assembly comprising:
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a housing formed for mounting to an air conduit and formed for the passage of air through the housing for one of discharge into and exhaust from a room; and at least one pressure tube having at least one opening therein, the tube being mounted to the housing with the opening positioned proximate a known cross sectional area of the housing to communicate pressure at the opening into the tube, and the tube extending from the opening to an open distal end with the distal end being secured in a position accessible from a room side of the housing, and the distal end being formed for releasable coupling of a pressure measurement device to the distal end for measurement from a room side of the housing of an air pressure differential in the housing proximate the area to enable a determination of the air flow rate in the housing at the known cross sectional area. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A pressure sensing assembly for mounting to an air flow control system comprising:
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a pressure tube having at least one opening therein adapted for communication of air pressure at the opening into the pressure tube, the pressure tube extending from the opening at a known cross section area of the housing to an open distal end of the tube remote of the opening for the communication of pressure at the opening to the distal end; and a mounting structure formed for mounting the pressure tube to a housing of an air flow control device with the opening positioned and orientated to communicate air pressure at the opening into the pressure tube, and the mounting structure being further formed to mount the distal end of the pressure tube for access to the distal end from a room side of the air flow control device to enable releasable coupling of a pressure measurement device to the distal end from the room side of the air flow control device. - View Dependent Claims (16, 17, 18, 19)
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20. A method of measuring the air pressure difference at a known area of an air flow control device housing comprising the steps of:
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mounting at least one air pressure communicating tube having at least one opening therein to a housing of the air flow control device in a position in the housing having a known cross sectional area to sense supply air pressure in the air diffuser at the opening, the tube being formed to communicate the sensed air pressure to an open distal end of the tube positioned on a room side of the air flow control device; from the room side of the air flow control device, releasably coupling an air pressure measurement device to the distal end of the tube; and measuring an air pressure communicated to the distal end of the tube. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28)
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Specification