[특허]Constant air flow control apparatus and method

Constant air flow control apparatus and method 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F04B-049/06
출원번호	US-0250296 (1994-05-27)
발명자 / 주소	Nordby Craig (Chesterfield MO) Thorn John S. (Florissant MO) Skinner James (Florissant MO)
출원인 / 주소	Emerson Electric Co. (St. Louis MO 02)
인용정보	피인용 횟수 : 65 인용 특허 : 0

초록 ▼

Air handling apparatus (10) for delivering a volume of air at a generally constant flow rate regardless of changes in the operating conditions of a system with which the apparatus is used. A blower (12) pushes air from one point to another. The blower is operated by a blower motor (14). A switch (16) controls application of power to the motor. Sensors (20) are used to sense the voltage supplied to the motor, the current drawn by the motor, and the motor\s operating speed. A flow controller (22) establishes a desired air flow rate to be provided by the blower. A processor (18) is responsive to the sensed voltage (V), current (I), and speed (S), an input (C) from the flow controller, and constants (K1-K4) related to performance characteristics of the blower to determine a torque required by the motor to produce a predetermined air flow rate. The torque value is determined as a function of the combined motor speed input from the sensor and an input from the flow controller. The processor is responsive to a calculated torque value for the motor. The processor supplies a control signal to the switch to control application of a voltage to the motor. This voltage is sufficient for the motor to produce the calculated torque. The processor includes feedback (28) by which the control signal can be modified first in response to the sensed current drawn by the motor; and additionally, by the voltage supplied to the motor.

대표청구항 ▼

In an air handling system for delivering air by a blower system utilizing a blower and a blower motor for running the blower, the blower having air flow, pressure, torque and current characteristics, apparatus for providing a constant flow rate of air comprising: first sensing means for sensing the operating speed of the motor; second sensing means for sensing the current drawn by the motor; third sensing for sensing a voltage applied to the motor; switch means for controlling application of power to the motor; flow control means for establishing a desired air flow rate; and, processor means responsive to inputs from each of the sensing means and the flow control means to determine a torque required to be produced by the motor for a predetermined air flow rate, the torque being determined as a function of the combined inputs from the first sensing means and the flow control means together with individual inputs from the first sensing means and the flow control means and air flow, pressure, torque, and current characteristics of the blower, the processor means being responsive to a calculated torque value for the motor to supply a signal to the switch means to control application of voltage to the motor, the voltage supplied to the motor being sufficient for the motor to produce the calculated torque, and the processor means being responsive to the inputs from the second and third sensing means to vary the signal supplied to the switch means in accordance with sensed motor operating conditions, the processor means determining the torque required to be produced by the motor in accordance with the formula torque=(K1*S*C)+(K2*S)+(K3*C)+K4, where S is an input from the first sensing means representing motor speed, C is an input from the control means representing desired air flow, and K1, K2, K3, and K4 are constants for the particular blower being operated by the motor, and respectively represent air flow, torque, pressure, and speed characteristics of the blower, the torque determined by the formula including a constant offset torque which is proportional to the desired air flow rate.

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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Constant air flow control apparatus and method 원문보기

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Constant air flow control apparatus and method 원문보기

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