JPS6032505Y2 - automatic ventilation fan - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an automatic ventilation fan that automatically starts ventilation operation when a gas appliance is used.

As this type of automatic ventilation fan, one having the configuration shown in FIG. 2 has conventionally been provided.

That is, in this FIG. 2, 1 is a detection unit for detecting the usage status of a gas appliance, such as an instantaneous water heater 2, and this detects a change in gas pressure according to the operation of the instantaneous water heater 2 using a pressure detection unit 3. to close the normally open detection switch.

5 is a ventilation fan unit equipped with a fan motor 6 and a manual switch 7 for turning on/off the fan motor 6 and switching the speed; 8 is a power plug; 9 is a connector; 10 is for automatic ventilation operation and manual ventilation operation. This is a selection switch for selecting one.

In the automatic ventilation fan having such a configuration, when the connector 9 is connected and the selection switch 10 is closed, the manual switch 7 can be used to start and stop the ventilation operation and change the speed of the fan motor 6. , and selection switch 1
If 0 is left open, it can be started automatically in response to the closing of the detection switch 4 in response to the operation of the instantaneous water heater 2.

However, in the above conventional configuration, when the contacts m and n of the manual switch 7 are closed, in other words, the fan motor's energizing path is open, when the detection switch 4 is closed, the automatic There is a problem in that the ventilation operation cannot be started when the automatic ventilation operation is selected by opening the selection switch 10. Therefore, when the selection switch 10 is opened and the automatic ventilation operation is selected, the manual switch 7 must be operated at the same time, which makes the operation cumbersome. There is a problem.

The present invention was developed in response to the above circumstances, and its purpose is to reliably start automatic ventilation operation when a gas appliance is operated, regardless of the switching state of the manual switch for energizing or disconnecting the fan motor. To provide an automatic ventilation fan which can eliminate troublesome operations.

An embodiment of the present invention will be described below with reference to FIG.

Reference numeral 11 denotes a detection unit, which detects gas pressure changes in the connecting pipe 1 when the instantaneous water heater 12, which is a gas appliance, is operated.
3, and a normally open detection switch 15 that is closed when the pressure detection section 14 detects the operation of the instantaneous water heater 12.

Reference numeral 16 denotes a power plug inserted into a power outlet (not shown), which is connected to the female connector 1 via the detection switch 15.
7a to supply power.

Therefore, when the instantaneous water heater 12 is operated and the detection switch 15 is closed, the power supply voltage from the power outlet is outputted to the female connector 17a as an operation detection signal.

Now, 18 is a ventilation fan unit, which will be described below.

That is, 19 is a common terminal C and a high speed terminal H9 which is a drive terminal.
A fan motor is equipped with a low-speed terminal, and when it is energized, it rotates a fan (not shown) to perform ventilation operation.

20 is a manual switch for controlling the power on/off and speed of the fan motor 19, which connects its fixed contacts a and b to the high speed terminal H and low speed terminal of the fan motor 19, respectively, and also connects the fixed contact C to the high speed terminal H and low speed terminal of the fan motor 19, respectively. is open to the public.

A relay 21 is a switching device, and both ends of an excitation coil 22 are connected via a conductive wire 23 between both terminals of a male connector 17b paired with the female connector 17a.
On the other hand, the normally open contact e and the normally closed contact f of the relay switch 24, which is a changeover switch section, are connected to the high speed terminal H of the fan motor 19 and the movable contact d of the manual switch 20, respectively, so that the relay switch 24 is connected to the manual switch 20. It is located at the front of the .

In addition, 25 is a power plug inserted into a power outlet, and one terminal of the power plug is connected to the movable contact g of the relay switch 24.
The other terminal is connected to the common terminal C of the fan motor 19.

Next, the operation of the above configuration will be explained.

Since the detection switch 15 is open when the instantaneous water heater 12 is not operated in a state where the female connector 17a and the male connector 17b are connected to each other, the power supply voltage serving as the operation detection signal is applied to the excitation coil 22. No voltage is applied, and the relay 21 closes the contacts g and f of the relay switch 24.

Therefore, the manual switch 20 connects the power source to the contact g-
f and is connected via the power plug 25.

In this state, when the contacts d and a of the manual switch 20 are closed, the fan motor 19 is energized from its high-speed terminal H and rotates at high speed, and the contacts d and b of the manual switch 20 are
When the gap is closed, the fan motor 19 is energized from its low speed terminal and rotates at a low speed, thereby performing either a "strong" ventilation operation or a "weak" ventilation operation.

When the contacts d and c of the manual switch 20 are closed, the fan motor 19 is cut off and the ventilation operation is stopped.

On the other hand, for example, when the instantaneous water heater 12 is operated while the contacts d and c of the manual switch 20 are closed and the ventilation operation is stopped, the detection switch 15 in the detection unit 11 is closed in response to the operation. Therefore, a power supply voltage serving as an operation detection signal is outputted from the female connector 17a and applied to the excitation coil 22, thereby causing the relay switch 2
4 switches to close its contacts ge.

Therefore, the high-speed terminal H of the fan motor 19 is connected to the power source through the contacts g and e of the relay switch 24, and the "strong" ventilation operation is automatically started.

Thereafter, when the operation of the instantaneous water heater 12 is stopped, in response to this, the power supply voltage serving as the operation detection signal is no longer output from the female connector 17a and the detection switch 15 is returned to open, so that the excitation coil 22 is cut off. The contacts g and f of the relay switch 24 are closed, and at this time, the manual switch 20 is in the closed state between the contacts d and c, so the fan motor 19 is cut off and the ventilation operation is automatically stopped.

Furthermore, if the instantaneous water heater 12 is operated while the "weak" ventilation operation is being performed, the same action as described above will automatically switch to the "strong" ventilation operation, that is, the combustion gas etc. will be sufficiently exhausted. made, and then instant water heater 1
When the operation in step 2 is stopped, it switches to "weak" ventilation operation.

According to the present embodiment described above, when the instantaneous water heater 12 is operated, it is possible to automatically and reliably start the "strong" ventilation operation regardless of the switching state of the manual switch 20. Therefore, the instantaneous water heater 12 There is no risk that the air in the room where it is installed will become contaminated.

Further, it is convenient because the above-mentioned effect can be obtained simply by adding the relay 21 to a conventional ventilation fan unit.

In the above embodiment, relay 2 is used as a switching device.
1 is applied, but the invention is not limited to this, and a similar effect may be obtained using a switching element such as a thyristor. Also, switching between "strong" and "weak" ventilation operation using the manual switch 20 can be performed only to "strong" as necessary. Alternatively, the switching may be performed in multiple stages.

According to the present invention, as explained above, it is possible to reliably start automatic ventilation operation in conjunction with the operation of gas appliances, regardless of the switching state of the manual switch for energizing/disconnecting the fan motor. It is possible to provide an automatic ventilation fan that can omit troublesome operations as in the past.

[Brief explanation of drawings]

FIG. 1 is an electric circuit diagram showing one embodiment of the present invention, and FIG. 2 is an electric circuit diagram showing a conventional example. In the figure, 11 is a detection unit, 12 is an instantaneous water heater (gas appliance), 15 is a detection switch, 16°25 is a power plug, 18 is a ventilation fan unit, 19 is a fan motor, H and L are high-speed terminals and low-speed terminals that are drive terminals. A terminal, 20 is a manual switch, 21 is a relay (switching device), 23 is a conducting wire, and 24 is a relay switch (changeover switch section).

Claims (1)

[Scope of utility model registration request] A switching device having a detection unit that detects the usage state of a gas appliance and outputs a motion detection signal, and a changeover switch section that receives the motion detection signal via a conductor and is switched depending on the presence or absence of the signal. and a ventilation fan unit provided with a manual switch for energizing the fan motor, and the changeover switch section is located upstream of the manual switch to selectively connect the power source to either the manual switch or the drive terminal of the fan motor. An automatic ventilation fan characterized by being configured to