JPH0765789B2 - Automatic operation device for air supply fan - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation device capable of appropriately maintaining a pressure difference between the inside and outside of a room for effective ventilation.

2. Description of the Related Art In recent years, in order to make effective use of land, buildings are becoming taller, housing is no exception, and apartment houses are becoming taller. If the building is made taller, the influence of the outside wind will be greater, and the airtightness of the house will be very high in order to maintain the heating and cooling effect.

For this reason, the conventional ventilation system for a house has the structure shown in FIG. That is, the exhaust fan 102 is provided at the exhaust port 103 of the house 101, and the air supply port 105 is provided.
The air supply fan 104 is provided in the air conditioner, and when the exhaust fan 102 is operated, the air supply fan 104 operates in conjunction with each other to ventilate the living room while taking in air from the air supply port 105.

In addition, the control circuit in this type of air supply fan 104 has a fourth
The configuration was as shown in the figure. Ie differential pressure switch 10
When the pressure difference between the inside and outside of the room becomes equal to or more than a predetermined value by 6, the contact of the differential pressure switch 106 is turned on and the intake fan 104
When the value becomes equal to or less than a predetermined value, the contact point of the differential pressure switch 106 is turned off and the air supply fan 104 is stopped.

Problems to be Solved by the Invention With such a conventional configuration, when the exhaust fan 102 is operated and the pressure difference between the indoor and outdoor exceeds a predetermined value, the contact of the differential pressure switch 106 is turned on. The intake fan 104 is driven. At this time, if the pressure difference between the indoor and outdoor due to the opening and closing of the door or the outside wind falls below the predetermined value at the temporary point,
The contact of the differential pressure switch 106 is turned off, and the air supply fan 104 is stopped. However, since the above-mentioned phenomenon is for a short time, the pressure difference between the indoor and outdoor becomes again a predetermined value or more, and the air supply fan
104 had a problem that it was driven and the operation became unstable.

The present invention solves such a problem, and controls the operation of the air supply fan so that the pressure difference between the inside and the inside of the room is maintained within an allowable range, and is affected by the opening and closing of the door or the outside wind. It is an object of the present invention to provide an automatic operation device for an air supply fan that enables stable and comfortable ventilation without any problems.

Means for Solving the Problems In order to solve this problem, the present invention provides two differential pressure sensors that detect a pressure difference between the inside of a room, that is, a specified high differential pressure and generates a signal. Using a high differential pressure detection differential pressure sensor and a low differential pressure detection differential pressure sensor that detects a specified low differential pressure and generates a signal, when the signal output of these differential pressure sensors continues for a certain period of time, A microcomputer that operates the number of rotations of the motor, and a drive circuit that changes the number of rotations based on the output signal from the microcomputer and operates the air supply fan so as to maintain the pressure difference between the indoor and outdoor ranges within an allowable range. An automatic operation device for an air supply fan comprising:

Operation With this configuration, when the pressure difference between the indoor and outdoor is higher than the specified high differential pressure for a certain period of time, the rotation speed of the air supply fan is increased to increase the air supply amount, and the continuous high pressure is maintained. The air supply amount is increased until it becomes low, and when it becomes lower than the prescribed high differential pressure continuously, the increase of the rotation speed is stopped and the rotation speed at that time is maintained. In addition, when the pressure difference between the indoor and outdoor is lower than the specified low differential pressure for a certain period of time, the rotation speed of the air supply fan is decreased to reduce the air supply amount, and continuously higher than the specified low differential pressure. The supply air amount is reduced until it reaches a predetermined low differential pressure, and when it becomes continuously higher than the specified low differential pressure, the reduction of the rotation speed is stopped and the rotation speed at that time is maintained. In this way, the pressure difference between the inside and outside of the room is maintained at an appropriate value between the specified low differential pressure and the specified high differential pressure, and in order to operate after a certain period of time, the door is opened or closed or the influence of outside wind is applied. It is possible to automatically operate the air supply fan for stable ventilation without being affected.

EXAMPLES An example of the present invention will be described below with reference to FIGS. 1 and 2.

In FIG. 2, the house 1 has an exhaust fan 2 at an exhaust port 3, an air supply fan 4 at an air supply port 5, an outdoor side detection port 8 and an indoor side detection port 6, and pressures inside and outside the room 10. A high differential pressure detection differential pressure sensor 11 that detects a specified high differential pressure in response to a difference and generates a signal, and a low differential pressure detection differential pressure sensor 12 that detects a specified low differential pressure and generates a signal. An automatic driving device 7 that determines the output state to the air supply fan 4 according to the outputs of the high differential pressure detection differential pressure sensor 11 and the low differential pressure detection sensor 12 is provided.

In FIG. 1, the signals of the high differential pressure detection differential pressure sensor 11 and the low differential pressure detection differential pressure sensor 12 are input to the microcomputer 22 via the detection unit 21 of the automatic driving device 7, and the high differential pressure detection differential pressure sensor 11 is detected. When the signal state of the low differential pressure detection differential pressure sensor 12 continues for a certain period of time, the microcomputer 22 drives the drive unit.
An output signal is output to 23, and the drive unit 23 controls the rotation speed of the air supply fan 4.

The operation of the automatic driving device for the air supply fan having the above configuration will be described below.

When the exhaust fan 2 provided in the exhaust port 3 of the house 1 is operated, a pressure difference is generated between the inside 10 and the outside 9 of the house 1. Then, a pressure difference is generated between the indoor space 10 and the outdoor space 9 at the outdoor side detection port 8 and the indoor side detection port 6. Accordingly, when the specified high differential pressure is exceeded, the high differential pressure detection differential pressure sensor 11 to the detection unit 21
To the microcomputer from the detector 21.
Transmitted to 22. The microcomputer 22 confirms that it continues for a certain period of time, and changes the rotation speed of the air supply fan 4 through the drive unit 23 from a weak notch to a medium notch, without being affected by the opening / closing of the door or the disturbance caused by the outside wind. From the notch to the strong notch and until the signal from the high differential pressure detection differential pressure sensor 11 stops continuously, the rotation speed is gradually increased to increase the supply air amount. High differential pressure detection At the time when the signal from the differential pressure sensor 11 continues to stop, the rotation speed at that time is maintained, a certain amount of air supply is secured, and the state of the room 10 where the specified high differential pressure is not exceeded Keep

When the exhaust fan 2 is stopped or the exhaust amount is reduced, the pressure difference between the house 1, the room 10 and the outdoor 9 decreases. Then, the pressure difference between the indoor 10 and the outdoor 9 at the outdoor detection port 8 and the indoor detection port 6 decreases. In response to this, when the pressure becomes equal to or lower than the specified low differential pressure, a signal is transmitted from the low differential pressure detection sensor 12 to the detection unit 21, and is transmitted from the detection unit 21 to the microcomputer 22. The microcomputer 22 confirms that it continues for a certain period of time, and changes the rotation speed of the air supply fan 4 through the drive unit 23 from the strong notch to the medium notch, without being affected by the opening / closing of the door or the disturbance caused by the outside wind. From the notch to the weak notch, the rotational speed is gradually reduced until the signal from the low differential pressure detection differential pressure sensor 12 from the currently held notch stops continuously, or until the air supply fan 4 stops. Reduce the volume. Low differential pressure detection At the time when the signal from the differential pressure sensor 12 is continuously stopped, the rotation speed at that time is held to secure a constant air supply amount.

As described above, according to the present embodiment, the exhaust fan 2 is installed in the room 10.
Even if is operated, the microcomputer 22 controls the operation of the air supply fan 4 on the basis of the output signals from the high differential pressure detection differential pressure sensor 11 and the low differential pressure detection differential pressure sensor 12 to obtain the specified high differential pressure. Do not exceed the specified low differential pressure so that the room 10
And the pressure difference between the outdoor 9 and the outdoor 9 are maintained at an almost appropriate value for effective ventilation, and stable and comfortable automatic ventilation operation is performed without being affected by the opening / closing of the door or the external wind disturbance. be able to.

Although the air supply fan 4 is described as an AC motor in the embodiment, it goes without saying that the air supply fan 4 is not limited by the type of motor capable of controlling the rotation speed.

EFFECTS OF THE INVENTION As will be apparent from the above description of the embodiments, the present invention makes the pressure difference between the indoor and outdoor sides substantially constant by effective ventilation by the air supply fan, the differential pressure sensor, the microcomputer, and the like. It can be maintained, stable and comfortable ventilation is possible, and the effect obtained is extremely large.

[Brief description of drawings]

FIG. 1 is a control circuit diagram of an automatic operation device for an air supply fan according to an embodiment of the present invention, FIG. 2 is the same configuration diagram, FIG. 3 is a configuration diagram of a conventional automatic operation device for an air supply fan, and FIG. The figure is the same control circuit diagram. 4 ... Air supply fan, 11 ... High differential pressure detection differential pressure sensor, 12 ...
… Low differential pressure detection differential pressure sensor, 22 …… Microcomputer, 23 …… Drive section.

Claims (1)

[Claims] 1. Two differential pressure sensors for detecting a pressure difference between indoor and outdoor, that is, a high differential pressure detection differential pressure sensor for detecting a prescribed high differential pressure and generating a signal, and a prescribed low differential pressure. Equipped with a low differential pressure detection differential pressure sensor that detects and generates a signal.When the signal output of these differential pressure sensors continues for a certain period of time, a microcomputer that operates the number of rotations of the motor and the output from this microcomputer An automatic operation device for an air supply fan, comprising: a drive circuit that changes the rotation speed based on a signal to operate the air supply fan so as to maintain the pressure difference between the indoor and outdoor areas within an allowable range.