JPH01114643A - Automatic operating device for air supplying fan - Google Patents

Abstract

PURPOSE:To permit stabilized comfortable ventilation without being affected by the opening and/or closing of a door or external wind, by a method wherein an air supplying fan is operated by a micro-computer so as to maintain a pressure difference between indoor and outdoor within an allowable range. CONSTITUTION:When an exhaust fan 2 is operated, a pressure difference between an indoor 10 and an outdoor 9 is generated at an outdoor side detecting port 8 and an indoor side detecting port 6. When the pressure difference has exceeded a specified pressure difference, a signal from a high pressure difference detecting sensor 11 is transmitted to a micro-computer. When it is confirmed that the signal has been continued for a given period of time, the rotating speed of an air supplying fan 4 is increased gradually to increase the amount of supplying air. When the signal from the sensor 11 has stopped after the signal is continued, the rotating speed of the fan 4 at that time is held to secure a given amount of supplying air. When the exhaust fan 2 is stopped or the amount of exhaust is reduced, the pressure difference between the indoor 10 and the outdoor 9 is reduced. When the pressure difference has become lower than the specified low pressure difference, the rotating speed of the air supplying fan 4 is reduced gradually by a signal from a low pressure difference detecting senser 12 and the rotating speed of the fan 4 at a time when the signal from the sensor 12 has been stopped continuously is held.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a ventilation system that can maintain an appropriate pressure difference between indoors and outdoors in order to perform effective ventilation.

BACKGROUND OF THE INVENTION In recent years, buildings have become taller in order to make more efficient use of land, and houses are no exception; apartment complexes are also becoming taller. The higher the building was, the greater the influence of outside winds, and in order to maintain the effectiveness of heating and cooling, the structure was designed to resemble a residential building. That is, the exhaust fan 102 is provided at the exhaust port 103 in the house 1o1, and the air supply fan 1 is provided at the air supply port 106.
04 was provided, and when the exhaust fan 102 was operated, the air supply fan 104 was operated in conjunction with the air supply fan 104 to ventilate the living room while taking in air through the air supply port 105.

Further, the control circuit in this type of air supply fan 104 had a configuration as shown in FIG. That is, when the differential pressure switch 106 causes the pressure difference between the indoor and outdoor areas to exceed a predetermined value, the contact point of the differential pressure switch 106 is turned ON to drive the air supply fan 104, and the pressure difference between the indoor and outdoor areas becomes below the predetermined value. In this case, the contact of the differential pressure switch 106 was turned OFF to stop the air supply fan 104.

Problems to be Solved by the Invention When the exhaust fan 102 is operated in such a conventional configuration,
If the pressure difference between indoors and outdoors exceeds a specified value,
Turn on the contact of the differential pressure switch 106 to turn on the air supply fan 104
drive. At this time, if the pressure difference between indoor and outdoor becomes less than a predetermined value at one point due to opening/closing of the door or outside wind, the contact point of the differential pressure switch 106 goes to 0FFL and the air supply fan 104 is stopped. However, since the phenomenon occurs for a short period of time, the pressure difference between the indoor and outdoor areas becomes equal to or greater than a predetermined value again, causing the problem that the air supply fan 104 is driven and its operation becomes unstable.

The present invention solves these problems by controlling the operation of the air supply fan so that the pressure difference between indoors and indoors is maintained within an allowable range, and also by controlling the operation of the air supply fan so that the pressure difference between indoors and indoors is maintained within an allowable range. To provide an automatic operation device for an air supply fan that can perform stable and comfortable ventilation without any trouble.

Means for Solving the Problem In order to solve this problem, the present invention provides two differential pressure sensors that detect the pressure difference between indoors and indoors, that is, detect a predetermined high differential pressure and generate a signal. When the signal output of these differential pressure sensors continues for a certain period of time using a high differential pressure detection differential pressure sensor that generates a high differential pressure and a low differential pressure detection differential pressure sensor that detects a specified low differential pressure and generates a signal. There is a microcomputer that controls the rotation speed of the motor, and a drive that changes the rotation speed based on the output signal from this microcomputer and operates the air supply fan to maintain the pressure difference between indoors and outdoors within an acceptable range. This configuration constitutes an automatic operation device for an air supply fan, which includes a circuit.

With this configuration, if the pressure difference between indoors and outdoors becomes 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 amount of air supplied, and the specified high differential pressure is increased. The air supply amount is increased until the pressure becomes continuously lower than the specified high differential pressure, and when the differential pressure continues to be lower than the specified high differential pressure, the rotation speed is stopped from increasing and the rotation speed at that time is maintained. In addition, if the pressure difference between indoors and outdoors is lower than the specified low differential pressure for a certain period of time, the rotation speed of the air supply fan will be lowered to reduce the air supply amount, and the pressure will continue to rise above the specified low differential pressure. The supply air amount is decreased until the differential pressure becomes higher than the specified low differential pressure, and when the rotational speed continues to be higher than the specified low differential pressure, the rotational speed is stopped from decreasing and the rotational speed at that time is maintained. In this way, in order to maintain the pressure difference between indoors and outdoors at an appropriate value between a specified low differential pressure and a specified high differential pressure, and to operate after a certain period of time, it is possible to This means that the air supply fan can automatically operate for stable ventilation without having to be affected.

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

In FIG. 2, a house 1 has an exhaust fan 2 at the exhaust port 3, an air supply fan 4 at the air supply port 5, an outdoor detection port 8, and an indoor detection port 6, and the pressure inside the room 10 and outdoors 9. 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 operation device 7 is provided which 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.

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 transmitted to the detection unit 21 of the automatic operation device 7.
When the signal state of the high differential pressure detection differential pressure sensor 11 and the low differential pressure detection differential pressure sensor 12 continues for a certain period of time, an output signal is output from the microcomputer 22 to the drive unit 23, The drive unit 23 controls the rotation speed of the air supply fan 4.

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

When the exhaust fan 2 provided at the exhaust port 3 of the house 1 is operated, a pressure difference is generated between the indoor 10 and the outdoor 9 of the house 1. Then, at the outdoor detection port 8 and the indoor detection port 6, the indoor
A pressure difference occurs between 0 and the outdoor 9. Correspondingly, if the predetermined high differential pressure is exceeded, a signal is transmitted from the high differential pressure detection differential pressure sensor 11 to the detection section 21, and from the detection section 21 to the microcomputer 22. microcomputer 2
2 continues for a certain period of time, and the drive unit 2
The high differential pressure detection differential pressure sensor 1 changes the rotation speed of the air supply fan 4 from a weak notch to a medium notch and from a medium notch to a strong notch through the
Gradually increase the rotation speed until the signal from 1 stops continuously to increase the air supply amount. High differential pressure detection When the signal from the differential pressure sensor 11 continues and stops, the current rotational speed is maintained, a constant supply air amount is secured, and the indoor condition 1o does not exceed the specified high differential pressure. keep it.

Further, when the exhaust fan 2 is stopped or the exhaust amount is reduced, the pressure difference between the house 1, the indoor room 10, and the outdoor room 9 decreases. Then, the pressure difference between the indoor side 1o and the outdoor side 9 at the outdoor side detection port 8 and the indoor side detection port 6 is reduced. In response to this, when the differential pressure falls below the specified low differential pressure, a signal is transmitted from the low differential pressure detection sensor 12 to the detection unit 21, and from the detection unit 21 to the microcomputer 22. The microcomputer 22 confirms that the operation has continued for a certain period of time, and changes the rotation speed of the air supply fan 4 from a high notch to a medium notch through the drive unit 23 without being affected by the opening/closing of the door or disturbances caused by outside wind. Low differential pressure detection differential pressure sensor 12 from the currently held notch to the weak notch
The rotational speed is gradually lowered to reduce the air supply amount until the signal from the air supply fan 4 continuously stops or until the air supply fan 4 stops. When the signal from the low differential pressure detection differential pressure sensor 12 stops continuously, the rotational speed at that time is maintained to ensure a constant amount of air supply.

As described above, according to this embodiment, even if the exhaust fan 2 is operated in the room 10, the microcomputer 2 The operation of the air supply fan 4 is controlled, and the pressure difference between the indoor air 10 and the outdoor air 9 is adjusted to an approximately appropriate level that allows effective ventilation so that the pressure difference does not exceed a specified high differential pressure and does not fall below a specified low differential pressure. In addition, automatic ventilation operation with excellent stability and comfort can be performed without being affected by door opening/closing or external wind disturbances.

In the embodiment, the air supply fan 4 is described using an AC motor, but it goes without saying that the type of motor is not limited to one whose rotational speed can be controlled.

Effects of the InventionAs is clear from the explanation of the embodiments above, the present invention uses an air supply fan, a differential pressure sensor, a microcomputer, etc. to maintain the pressure difference between indoors and outdoors at a value that is almost constant at a value that allows effective ventilation. This makes it possible to maintain stable and comfortable ventilation, which has an extremely large effect.

[Brief explanation of the drawing]

FIG. 1 is a control circuit diagram of an automatic operation device for a supply air fan according to an embodiment of the present invention, FIG. 2 is a configuration diagram of the same, FIG. 3 is a configuration diagram of a conventional automatic operation device for a supply air 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 part. Figure 3 Figure 4

Claims (1)

[Claims] There are two differential pressure sensors that detect the pressure difference between indoors and outdoors: a high differential pressure sensor that detects a specified high differential pressure and generates a signal, and a differential pressure sensor that detects a specified low differential pressure and generates a signal. Equipped with a differential pressure sensor that detects the low differential pressure generated, and a microcomputer that controls the rotation speed of the motor when the signal output from these differential pressure sensors continues for a certain period of time, and a microcomputer that controls the rotation speed based on the output signal from this microcomputer. An automatic operation device for an air supply fan, comprising a drive circuit that changes the number of air supply fans and operates the air supply fan so as to maintain the pressure difference between indoors and outdoors within an allowable range.