JPH0758133B2 - Ventilation - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a ventilation fan of the type that blows out and discharges heat by exchanging heat between outdoor air and indoor air.

[Prior Art] Conventionally, as a ventilator, for example, as disclosed in Japanese Utility Model Laid-Open No. 62-1043, a blower blows the outdoor air from the air supply port and blows it out into the room from the air outlet, and the air intake port. BACKGROUND ART An air conditioning ventilation fan is used that forms an exhaust flow that sucks indoor air and discharges the air from the exhaust port to the outside of the room, and exchanges heat between the supply air flow and the exhaust flow by a heat exchanger.

As a result, fresh air outside the room is always supplied to the room,
The dirty air in the room is discharged to the outside.

[Problems to be Solved by the Invention] In the conventional ventilation device as described above, heat exchange between the supply air flow and the exhaust air flow is performed using the heat exchanger, and therefore heat loss of about 30% is avoided. There is a problem that it cannot be done. Further, since the outdoor air is taken in, there is a problem that cold air enters the room in winter even if heat exchange is performed.

The present invention has been made to solve the above-mentioned problems, and it is possible to reduce the heat loss, reduce the chances of cold winter air entering the room, and perform optimal ventilation. The purpose is to provide.

[Means for Solving the Problems] A ventilation device according to the present invention detects an oxygen concentration in a room by using an air-conditioning ventilation fan and an air purifier that sucks indoor air and blows it out through a dust collection filter. Is less than the specified value, the air volume blown by the air conditioning fan is larger than the air quantity blown by the air purifier, and when the oxygen concentration is more than the specified value, the air volume blown by the air cleaner is larger than the air volume blown by the air conditioning fan. It is designed to control.

[Operation] In the present invention, when the oxygen concentration in the room is low, the blowing air volume of the air conditioning ventilation fan is increased and the blowing air volume of the air purifier is decreased, so that the function of the air conditioning ventilation fan is mainly provided. Also,
When the oxygen concentration is high, the amount of air blown from the air purifier is increased, and the amount of air blown from the air conditioning ventilation fan is reduced, so that the function of the air purifier is the main function.

[Embodiment] FIGS. 1 to 4 are views showing an embodiment of the present invention.
FIG. 4 is a plan sectional view, FIG. 2 is a front view, FIG. 3 is a block circuit diagram of the air volume control device, and FIG. 4 is a flowchart showing the operation of the air volume control device.

In FIG. 1 and FIG. 2, (1) is the wall of the building, the upper side of the wall (1) shows the outside, and the lower side shows the inside. (2) is a box body fixed to the indoor side of the wall (1), which is an air supply port (2a) communicating with the outside via an air supply pipe (3), and air outlets (2b) (2c) opening to the room. It also has an intake port (2d) (2e) and an exhaust port (2f) communicating with the outside through an exhaust pipe (4). (5) and (6) are air supply passages and exhaust passages that are separated from each other, and the air supply passages (5) include the air supply port (2a) and the air outlet (2).
The air supply flow (7) is circulated through the b), and the exhaust passage (6) circulates the exhaust flow (8) between the intake port (2d) and the exhaust port (2f). (9) is an air supply blower provided in the air supply passage (5), (10) is an exhaust air blower provided in the exhaust passage (6), and (11) is an air blower (9) (10) The driving motor, (12), is a well-known heat exchanger that has two flow passages that are independent of each other and intersect each other, and the feed air flow (7) flows through one flow passage and the exhaust flow ( 8) is distributed. The blowers (9) and (10), the motor (11) and the heat exchanger (12) constitute an air conditioning ventilation fan (13).
(14) is a blower for recirculation provided separately from the air conditioning ventilation fan (13), (15) is a motor for driving the fan, and (16) is provided between the blower (14) and the intake port (2e). An air purifier (17) is composed of the blower (14), the motor (15) and the dust collecting filter (16). (1
8) is an oxygen concentration detector provided in the box (2), (1
9) is an air volume control device.

In FIG. 3, (19) is an air volume control device composed of a microcomputer (hereinafter referred to as a microcomputer), which includes a CPU (19A),
Memory (19B), input circuit (19C) and output circuit (19D)
(Including a drive circuit), the input circuit (19C) is connected to the oxygen concentration detector (18), and the output circuit (19D) is connected to the motors (11) and (15).

In the ventilation device configured as described above, the motor (1
When 1) rotates, outdoor air is sucked in through the air supply pipe (3) through the air supply port (2a) by the air supply blower (9), and this air supply airflow (7) is supplied to the air supply passageway (5) and the heat exchange. It is blown out into the room through the outlet (2b) through the container (12).
In addition, the indoor air is sucked in through the intake port (2d) by the exhaust blower (10), and this exhaust flow (8) passes through the exhaust passage (6) and the heat exchanger (12) to the exhaust port (2f) and It is discharged to the outside through the exhaust pipe (4). Then, the supply airflow (7) and the exhaust airflow (8) are heat-exchanged with each other in the heat exchanger (12).

On the other hand, when the motor (15) rotates, the recirculation blower (14)
As a result, the indoor air is sucked from the intake port (2e), passes through the dust collection filter (16), and is blown out as clean air from the outlet port (2c).

At this time, the motors (11) (15) use the oxygen concentration detector (18).
The rotational speed of the air volume control device (19) is controlled in accordance with the output of the air flow rate control unit (19), and the air volume blown out from the air outlets (2b) (2c) is controlled.

Next, the air volume control operation will be described with reference to FIG.
The program of this flowchart is stored in the memory (19B) of the microcomputer.

In step (21), the output of the oxygen concentration detector (18) is read, and in step (22) it is judged whether the oxygen concentration is 20% or more. If it is less than 20%, the rotation speed of the blower motor (11) of the air conditioning ventilation fan (13) is increased in step (23) to increase the amount of air blown from the air outlet (2b). At the same time, the rotation speed of the blower motor (15) of the air purifier (17) is reduced to reduce the amount of air blown from the air outlet (2c). As a result, the total air volume of both is controlled to be substantially constant. That is, when the oxygen concentration in the room is low, the operation of the air conditioning ventilation fan (13) is the main operation, and fresh outdoor air is taken in.

Next, if the oxygen concentration is 20% or more, the rotation speed of the blower motor (11) of the air conditioning ventilation fan (13) is reduced in step (24) to reduce the amount of air blown from the air outlet (2b).
At the same time, the rotation speed of the blower motor (15) of the air purifier (17) is increased to increase the amount of air blown from the air outlet (2c), and the total amount of air is controlled to be substantially constant. That is, when the oxygen concentration in the room is high, the operation of the air cleaner (17) is mainly performed, and the room air is recirculated and purified. Therefore, the heat loss due to the heat exchanger (12) is reduced, and the chances of incoming cold air in the winter are also reduced.

The dust collecting filter (16) may be an electric dust collecting filter that electrostatically adsorbs dust particles by using a discharge line to which a high DC voltage is applied and an electrode plate.

Further, in the embodiment, the rotation speed of the blower motors (11) and (15) is controlled to control the air volume, but it is also possible to control this by a damper. That is, a damper whose operation is controlled by a motor is provided at the air supply port (2a) and the intake port (2d) (2e), and the motor is controlled by the output of the oxygen concentration detector (18) to open and close the damper. Even if the degree is controlled, the air flow rate can be similarly controlled.

[Effects of the Invention] As described above, according to the present invention, when the acidity concentration in the room is low, the blowing air volume of the air conditioning ventilation fan is increased, the blowing air volume of the air purifier is decreased, and when the oxygen concentration is high, The amount of air blown out is large and the amount of air blown out from the air conditioning ventilation fan is controlled to be small, so heat loss can be reduced, and the chances of cold winter air entering the room can be reduced, resulting in optimal ventilation. There is.

[Brief description of drawings]

1 to 4 are views showing an embodiment of a ventilation device according to the present invention. FIG. 1 is a plan sectional view, FIG. 2 is a front view, and FIG.
FIG. 4 is a block circuit diagram of the air volume control device of FIG. 1, and FIG. 4 is a flow chart showing the operation of the air volume control device. In the figure, (7) is a supply air flow, (8) is an exhaust flow, (9) is an air supply blower, (10) is an exhaust air blower, (11) is a motor,
(12) is a heat exchanger, (13) is an air conditioning ventilation fan, (14) is a recirculation fan, (15) is a motor, (16) is a dust collecting filter,
(17) is an air purifier, (18) is an oxygen concentration detector, (19)
Is an air volume control means (air volume control device). The same reference numerals in the drawings denote the same parts.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display area F24F 7/08 K

Claims (1)

[Claims] 1. A blower that forms a supply air stream that sucks in outdoor air and blows out into the room and an exhaust stream that sucks in air and discharges it out of the room, and a heat exchanger that exchanges heat between the supply air stream and the exhaust stream. An air-conditioning ventilation fan, an air purifier that sucks the air in the air by a blower and blows it out into the room through a dust collection filter, an oxygen detector that detects the oxygen concentration in the room, and the oxygen concentration is less than a predetermined value. When the above, the air volume blown by the air conditioning ventilation fan is made larger than the air volume blown by the air cleaner, and when the oxygen concentration is above a predetermined value, the air volume blown by the air cleaner is made larger than the air volume blown by the air conditioning ventilator. A ventilation device comprising an air volume control means for controlling.