JPH01222138A - Air flow control device for blower - Google Patents

Abstract

PURPOSE:To maintain an optimum air flow rare stably even under the affection of duct friction or outside wind, by judging air flow rate based on a measured signal from a measuring device for air pressure deviation ratio, and regulating the electric current to a blower so as to operate the blower at a predetermined rotation speed for the optimum air flow rate. CONSTITUTION:When a blower 1 is operated, air is supplied from an air inlet 10, sucked to a suction port 2, and exhausted from an air outlet 7 through an air discharge port 3 and a duct 6. During operation, it is hard to maintain an optimum air flow rate occasionally owing to the affection of the duct friction or outside wind. At this state, the discharged air pressure measured by a pressure sensor 4 attached to the discharge port 3 deviates from the reference pressure at the predetermined optimum air flow rate. The ratio of air pressure deviation is measured by a measuring device 5A for air pressure deviation, the measured signal is input to an air flow rate judgment device 5B which judges the air flow rate, and the air flow rate judgment device 5B sends a judgment signal to a blower driving device 5C which regulates the electric current to the blower 1, so that the rotation speed of the blower 1 is changed to maintain the optimum air flow rate.

Description

[Detailed description of the invention] Industrial applications The present invention relates to air blow control of a blower.

Conventional technology Conventionally, when using a blower to ventilate a house, especially in apartment complexes, the floor plan of each dwelling unit is often uniform, and the capacity is determined by taking into account the resistance of the duct connected to the blower and the air supply resistance. Once decided, the necessary air volume could be obtained in any dwelling unit.

For this reason, when a conventional blower is operated as shown in FIG. The problem that the invention was trying to solve was that electricity was passed through the room's exhaust port 106 to the outside of the room. Since the piping is different for each residence, naturally there are differences in duct resistance. In addition, as land prices soar, buildings are getting taller, and the effects of outside wind are different on lower and upper floors. Something has happened.

Due to differences in floor plans and floor plans of each dwelling unit, conventional blowers may not be able to secure the optimal air volume.If the air volume exceeds the optimal air volume, the cooling and heating effect will decrease, and if the K volume is too low, ventilation will not be possible. Problems such as shortages have arisen.

The present invention has been made in consideration of the above-mentioned conventional problems, and an object of the present invention is to provide an air blower that can secure the entire optimal air volume even under the influence of Talito resistance and external wind.

Means for Solving the Problems In order to solve the problems, the present invention includes: a blower for discharging indoor air; a pressure sensor for measuring wind pressure provided on the outlet side of the blower; and a pressure sensor for measuring wind pressure detected by the pressure sensor. a wind pressure change rate measuring means for measuring the wind pressure change rate with respect to a predetermined standard wind pressure using the blowout wind pressure as an input signal; a blowout air volume determining means for determining the blowout air volume based on the measurement signal from the wind pressure change rate measuring means; and a blower drive means for controlling the amount of electricity applied to the blower so that the blower air amount determined by the blower air amount determining means becomes a predetermined optimum rotational speed.

Operation With this configuration, when the blower is operated, the pressure sensor measures the blowing air pressure of the blower, and using this blowing air pressure as an input signal, the wind pressure change rate measuring means measures the wind pressure change rate with respect to a predetermined standard wind pressure. Based on this measurement signal, the blowout air volume determination means determines the blowout air volume, and the blower drive means controls the amount of electricity supplied to the blower so that the blowout air volume becomes the predetermined optimal airflow, and the rotation speed of the blower is adjusted. This means that the optimum air volume can always be obtained.

EXAMPLE Hereinafter, an example of the present invention will be described based on FIG. In the figure, 1 is a blower installed indoors, and has an inlet 2 and an outlet 3. The outlet 3 is connected to an outdoor exhaust lower through a duct 6, and is connected to the outlet 3 of the blower 1. is provided with a pressure sensor 4 that measures the wind pressure inside the air outlet 3, and sends an electric signal obtained by converting the wind pressure to the blower 1.
is input to the control device 6 connected to the electric motor 1A.

The control device 6 receives the output of the pressure sensor 4 as input.

A wind pressure change rate measuring means 6A, a blowout air volume determination means 6B that determines the blowout air volume (based on the measured wind pressure change rate), and an amount of current applied to the electric motor 1A so as to achieve the rotation speed at the predetermined optimum air volume. and a blower driving means 6C for controlling the air blower.

In the above configuration, the air blower al! 1 is operated, air is supplied through the air supply port 1o, sucked in through the suction port 2, passes through the air outlet 3 and duct 6, and is discharged to the outside of the room through the exhaust lower. At this time, the maximum amount of airflow may not be secured due to the resistance of the duct 6 or the influence of outside wind.

For example, when the floor plan allows the blower 1 to be located far away from the exhaust lower and the duct 6 has many lengths and bends, or when the blowing direction of the blower 1 is opposite to the blowing direction or the distance of the duct 6 is short, When the outside wind 8 is blowing in the same direction as the blowing direction of the blower 1, the resistance is small and the air volume is higher than the optimum air volume.

When the pressure sensor 4 attached to the outlet 3 measures the outlet wind pressure in the above state, the rate of change in the wind pressure is measured by the rate of change measuring means 6A, which is different from the standard wind pressure at the predetermined optimum air volume. The measurement signal is input to the blowout air volume determination means 6B that determines the blowout air volume, and a determination signal is inputted from the blowout air volume determination means 5B to the blower drive means 6C that controls the amount of electricity supplied to the blower 1, and the blower 1 rotates. Change the number to obtain the optimal air volume.

As an example, the mounting position of the pressure sensor is shown in Fig. 1, but the mounting position of the pressure sensor is not limited to this, and any position where pressure can be accurately measured near the air outlet 3 will cause no problem. do not have.

Effects of the Invention From the explanation of the embodiments above, it is clear that according to the present invention, the pressure sensor can be connected even if there is resistance of the duct due to the difference in the floor plan or floor of the dwelling unit or the influence of outside wind. By controlling the air volume using a certain control device, the optimal air volume can be ensured at all times, preventing the deterioration of heating and cooling effects due to excessive air volume, and solving the problem of insufficient ventilation due to insufficient air volume. The effect is extremely large.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a blower air volume control device according to an embodiment of the present invention, and FIG. 2 is an installation configuration diagram of a conventional blower. 1...Blower, 3...Air outlet, 4...
...Pressure sensor, 6...Control device, 6A.
...Wind pressure change rate measuring means, 6B... Blowing air volume determining means, 6C... Blower driving means.

Claims (1)

[Claims] A blower for discharging indoor air, a pressure sensor for measuring wind pressure installed on the outlet side of the blower, and using the blowout wind pressure detected by the pressure sensor as an input signal, calculate the rate of change in wind pressure from a predetermined standard wind pressure. A wind pressure change rate measuring means to measure, a blowout air volume determining means to judge the blowout air volume based on the measurement signal from the wind pressure change rate measuring means, and an optimum blowout air volume determined by the blowout air volume determining means are predetermined. A blower air volume control device comprising: a blower drive means for controlling the amount of electricity supplied to the blower so that the number of rotations corresponds to the air volume.