JPH0221727Y2 - - Google Patents

Description

[Detailed description of the invention] <Technical field of the invention> This invention relates to the prevention of indoor leakage of exhaust gas from a simultaneous intake/exhaust type ventilation fan with a built-in intake/exhaust device for forced intake/exhaust type heaters commonly known as FF heaters. It is something.

<Prior art> Figures 5 and 6 show two examples of conventional simultaneous intake and exhaust type ventilation fans.
An intake impeller 3 and an exhaust impeller 4 coaxially driven by a motor 2, an intake pipe 5 communicating from the intake impeller 3 to the outdoors, an exhaust pipe 6 communicating from the exhaust impeller 4 to the outdoors, In addition, both the impellers 3 and 4
A heat exchanger 7 located on the indoor side of the room, an air supply pipe 8 branching from the intake pipe 5 and leading into the room, and an exhaust gas discharge pipe 9 branching from the exhaust pipe 6 and leading into the room are provided. O-rings 10 are fitted inside the tips 8a and 9a of the air supply pipe 8 and the exhaust gas discharge pipe 9 on the indoor side, respectively.In the example shown in FIG. In the example shown in FIG. 6, it opens on both sides of the indoor side.

And, the tips 8a and 9a were installed indoors.
The air supply pipe or exhaust pipe of the combustion device of the FF heater can be inserted airtightly through an O-ring 10.

Note that 11 is a cap that closes the indoor tips 8a and 9a during the summer season when the heater is not in use.

In the conventional simultaneous intake/exhaust type ventilation fan configured in this way, when the power is turned on, the motor 2 moves both impellers 3 and 4.
, and on the intake side, outdoor air flows into the intake pipe 5.
The indoor air is drawn into the room through the exhaust pipe 6, and on the exhaust side, the indoor air is discharged outside through the exhaust pipe 6.

In addition, the FF type heater installed indoors sucks outdoor air through the air supply pipe 8, and
Exhaust gas is sucked in through the exhaust gas discharge pipe 9 by the exhaust flow from the room flowing through the exhaust pipe 6, and is discharged to the outside together with this exhaust flow, and intake and exhaust for combustion are performed together with ventilation of the room. It can be done.

Therefore, in the conventional simultaneous intake/exhaust type ventilation fan configured as described above, when the exhaust gas from the FF heater is in operation, the exhaust gas from the FF heater is discharged together with the exhaust flow of indoor air discharged by the action of the exhaust impeller 4. However, when the ventilation fan was not in operation, there was a risk that part of the exhaust gas would flow backward through the exhaust pipe 6 and flow into the room.

<Summary of the invention> Therefore, in view of the above-mentioned conventional situation, the present invention has been developed by installing a damper on the upstream side of the branched position of the exhaust gas exhaust pipe in the exhaust pipe of the simultaneous intake and exhaust type ventilation fan, so that the exhaust gas can be removed when the ventilation fan is not in operation. The purpose is to block the pipe upstream of the branch to prevent exhaust gas from flowing into the room.

<Embodiment of the invention> Hereinafter, an embodiment of the invention will be described based on FIGS. 1 to 3.

Figure 1 shows the conventional example shown in Figure 5, and Figure 2 shows the conventional example shown in Figure 5.
The present invention is applied to the conventional example shown in the figure.
Components that are the same as those of the conventional simultaneous intake/exhaust type ventilation fan shown in FIGS.

In the present invention, the exhaust gas discharge pipe 9 in the exhaust pipe 6 is located on the upstream side of the room where the exhaust gas discharge pipe 9 is branched.
A damper 12 made of an aluminum plate, a plastic plate, etc. is provided so as to be openable and closable.As shown in FIG.
A shaft 13 whose both ends are supported by the side wall of the exhaust pipe 6
It is mounted so that it can rotate within a range of 90 degrees, and when the ventilation fan is in operation, it rotates and opens to a position parallel to the side wall of the exhaust pipe 6 due to the wind pressure resistance of the exhaust flow from the room, and when the ventilation fan is stopped, it opens. , the exhaust pipe 6 rotates under its own weight to a position perpendicular to the exhaust pipe 6.
It is arranged so as to block the area.

Next, to explain the function of such a simultaneous intake and exhaust type ventilation fan, when the power is turned on and the motor 2 is driven, the intake impeller 3 and the exhaust impeller 4 rotate together.
The intake action of taking outdoor air into the room through the intake pipe 5 and the exhaust action of discharging the indoor air to the outside through the exhaust pipe 6 are performed at the same time, and the damper 12 disposed inside the exhaust pipe 6 It opens with the wind pressure of the exhaust, and the air supply pipe 8 supplies outdoor air to the FF heater, and the exhaust gas exhaust pipe 9 lets the exhaust gas from the FF heater pass through the exhaust pipe 6. It is discharged to the outside together with the exhaust from the room, and the room is ventilated by a simultaneous intake/exhaust ventilation fan and the FF heater is used for intake and exhaust.

When the ventilation fan is not operating or is stopped, a damper 12 installed in the exhaust pipe 6 is used.
rotates under its own weight and blocks the upstream side of the branch point of the exhaust gas discharge pipe 9 in the exhaust pipe 6,
The exhaust gas of the FF heater from the exhaust gas exhaust pipe 9 is discharged to the outside via the exhaust pipe 6 without flowing to the indoor side due to the action of the damper 12.

Note that the simultaneous intake and exhaust ventilation fan of this embodiment has a heat exchanger 7.
It has an energy-saving structure that exchanges heat between the heated indoor air exhausted and the outdoor air taken in from outside.

FIG. 4 shows the main part of another embodiment equipped with a damper operation mechanism linked to the operation switch of a ventilation fan, and is located on the upstream side of the exhaust pipe 6 from the branching point of the exhaust gas discharge pipe 9, that is, indoors. Nearby, a damper 14 is attached to a shaft 13 whose both ends are supported on the side wall of the exhaust pipe 6 so as to be rotatable within a range of 90 degrees at a bracket portion 14a.
A weight 14b is provided at a position farthest from the bracket portion 14a on the edge of the frame.
A stopper portion 14c is formed by bending the edge at a position opposite to the bracket portion 14a with the bracket portion 14a interposed therebetween.

The stopper portion 14c of the damper 14
In this case, a wire 16 whose proximal end is wound around a small motor 15 disposed outside the exhaust pipe 6 and is retractably locked therethrough passes through a small hole 6a formed in the side wall of the exhaust pipe 6. The tip that was guided into the pipe is locked.

Furthermore, the small motor 15 is linked to the operating switch of the ventilation fan, and when the operating switch is turned on, it drives the wire 16 in the winding direction for a certain period of time, and when it is turned off, it drives the wire 16 in the unwinding direction for a certain period of time. A timer switch (not shown) is provided to allow this.

Next, to explain the function of such a simultaneous intake and exhaust type ventilation fan, when the operation switch of the ventilation fan is turned on, the motor 2 is driven and the intake impeller 3 and the exhaust impeller 4 are rotated, and at the same time, due to the action of the weight 14b. The damper 14, which was blocking the exhaust pipe 6, is moved parallel to the side wall of the exhaust pipe 6 by driving the small motor 15 for a certain period of time by the time limit switch of the damper operation mechanism linked to the operation switch of the ventilation fan, and winding the wire 16. The exhaust impeller 4 discharges indoor air and the exhaust gas of the FF fan unit is discharged from the exhaust gas discharge pipe 6.
Fresh air is sucked in from outside by the intake impeller 3. At this time, the low-temperature air drawn in from the outside is warmed by exchanging heat with the high-temperature indoor air discharged through the heat exchanger 7 in the heat exchanger 7, and then taken into the room. It also takes in air to the FF heater.

Then, the exhaust gas from the FF heater is discharged from the exhaust gas discharge pipe 9 through the exhaust pipe 6 together with the air from the room.

Furthermore, when the operation switch is turned off to stop the operation of this simultaneous intake and exhaust type ventilation fan, the small motor 15 is driven for a certain period of time by the time limit switch of the damper operation mechanism linked to the operation switch, and the wire 1
6 is rewound, the damper 14 is quickly activated by the action of the weight 14b, rotates to the position where the intake pipe 6 is completely blocked, and the exhaust gas is discharged from the exhaust gas discharge pipe 9.
The exhaust gas of the FF heater is prevented from flowing backward through the exhaust pipe 6 and flowing into the room.

<Effects of the invention> As described above, the present invention has a damper that can be opened and closed upstream of the branch of the exhaust gas discharge pipe of the exhaust pipe, so that the damper can be opened and closed.
It is possible to effectively prevent exhaust gas from the FF heater from entering the room.

Furthermore, if the damper is provided with a damper operation mechanism that includes a small motor that is driven in conjunction with the operation switch of the ventilation fan, the damper can be opened and closed quickly, and the damper can reliably control the indoor side of the exhaust pipe. can be blocked.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the present invention;
The figure is a sectional view showing another embodiment of the present invention, FIG. 3 is an enlarged view of the main part of the same embodiment, FIG. 4 is an enlarged sectional view of the main part of an embodiment equipped with a damper operating mechanism, and FIGS. FIG. 6 is a sectional view showing different conventional simultaneous intake and exhaust type ventilation fans. 3...Intake impeller, 4...Exhaust impeller, 5
...Intake pipe, 6...Exhaust pipe, 8...Air supply pipe, 9...Exhaust gas discharge pipe, 12,
14...damper, 14b...weight, 15...small motor, 16...wire.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) An intake pipe that communicates with the intake impeller from the outdoors, an exhaust pipe that communicates from the exhaust impeller with the outdoors, and a combustion pipe that branches from the intake pipe and connects to its indoor end. An air supply pipe that connects the air supply pipe of the device, and an exhaust gas exhaust pipe that branches from the exhaust pipe and connects the exhaust pipe of the combustion device to the indoor end thereof, and an exhaust gas exhaust pipe in the exhaust pipe. A simultaneous intake and exhaust type ventilation fan characterized by a damper installed on the upstream side of the branched position so that it can be opened and closed. (2) The simultaneous intake and exhaust ventilation fan according to claim 1, wherein the damper is operated by a small motor linked to a ventilation fan operation switch.