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Electric blower

An air supply device, electric technology, applied in the direction of machines/engines, space heating and ventilation, heating and ventilation control systems, etc., can solve problems such as excessive movement, inability to match the target air volume with the calculated air volume, and increased fluctuations

Inactive Publication Date: 2009-07-01
PANASONIC CORP
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Problems solved by technology

[0004] However, because the flow of air sent by the electric blower is inevitably accompanied by fluctuations, the electric blower of the prior art cannot make the target air volume consistent with the calculated air volume to continuously and stably operate, but often Operation under the condition of changing number of revolutions
In addition, since the feedback control system includes elements with large inertia such as motors and fans, excessive motion may occur, and in some cases, fluctuations may increase. And the phenomenon of running in an unstable state with fluctuations up and down

Method used

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no. 1 approach

[0012] Generally, in an output duct including a fan, if the state of the output duct is determined, the air volume is proportional to the number of revolutions of the fan, and the gradient of this relationship varies depending on the condition of the output duct. Moreover, if the state of the output pipe can be detected in some form, the relationship between the air volume and the number of revolutions can be determined. Here, the condition of the output pipe can be detected as the load of the blower, and the load of the blower can be detected as the output of the motor. Moreover, since the output of the motor is proportional to the product of the number of revolutions of the fan and the torque, if the number of revolutions is constant, the state of the output pipe can be detected by the torque of the motor. In addition, in the case of a DC motor, since the torque is proportional to the input current, the motor torque can be detected by measuring the input current of the motor...

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Abstract

The present invention provides an electric blower device, which measures the air volume of the blower relative to the number of revolutions of the fan under the condition that the load of the blower is detected in advance, and is based on the experimental data obtained by repeating it many times while changing the load of the blower. , find out the calculation formula for calculating the number of fan rotations used to discharge the target air volume corresponding to the size of the blower load. The air volume is the fan revolutions, and then moves to the operation based on the calculated fan revolutions.

Description

technical field [0001] The present invention relates to an electric blower used in an air conditioner connected to an outlet duct to supply air necessary for a cooling cycle or the like in accordance with the state of the outlet duct connected thereto. Background technique [0002] At present, as this type of electric air blower, so-called feedback control is performed, that is, the normal fan speed is monitored and the PWM (pulse width modulation) signal given to the motor is used to calculate the air volume, and the calculated air volume is compared with the target air volume. , when there is a difference between the two, correct the control signal to the motor. The content of this technique is disclosed, for example, in (Japanese Patent) Unexamined Patent Application Publication No. 7-301450 (hereinafter referred to as Patent Document 1). [0003] image 3 It is a flowchart of the conventional electric blower described in patent document 1. exist image 3 Medium, CFM T...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04D27/00F24F11/00
CPCY02B30/746
Inventor 大泷镇雄藤原慎二原田员宏
Owner PANASONIC CORP
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