JPS632778Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air purge device for gas appliances, and particularly to an air purge device suitable for appliances that cannot be visually checked for ignition, such as those installed outdoors.

Recently, many water heaters or bathtubs with water heaters are installed outdoors, and these types of appliances are
They are installed in advance in new homes and other homes that are about to move in, and are left as they are until the time you move in. Therefore, there is air in the gas piping, and when inspecting and trial running this type of appliance before moving in, there is the inconvenience of having to repeat the ignition operation until the air in the gas circuit is released. be. In particular, in the case of gas appliances in which the operating section is located indoors and the appliance body is located outdoors, pilot ignition cannot be visually confirmed, resulting in insufficient ignition confirmation.

This invention was made in view of this point,
By making it possible to perform air purge in gas piping using a separate operation from the normal operation of the equipment, it is possible to inspect and
The purpose is to make test runs easier.

The structure of the present invention is that, in a gas appliance equipped with a thermocouple type pilot flame safety device and installed outdoors, an air purge operation section is provided separately from the appliance operation section and inside the appliance main body, and the air purge operation section is provided inside the appliance main body. By operating the purge operation section,
When the solenoid valve inserted to open and close the pilot gas circuit and the circuit to the spark generator are turned on and the thermoelectromotive force within the thermocouple reaches a predetermined value, the circuit is turned on.
I decided to turn it off.

With the above configuration of the present invention, only the pilot gas circuit is opened by operating the air purge operating section provided on the instrument body, and at the same time, the spark generator is activated. As a result, when the air in the gas pipe is released and the air purge is completed, the pilot flame is ignited, and when the thermocouple is heated by the pilot flame and a predetermined thermoelectromotive force is generated in the thermocouple circuit, the pilot flame is ignited. The electric circuit to the solenoid valve and sparker inserted in the gas circuit is
It turns OFF and the pilot burner extinguishes.

Therefore, the air purge can be performed with a single air purge operation, and the inconvenience of repeated ignition operations can be eliminated. In addition, the air purge operation is performed on the instrument body side, and the ignition of the pilot burner can be visually confirmed, making it reliable.

Incidentally, after the above air purge operation, the instrument may be trial run and inspected by normal operation of the operating section of the instrument.

Since the present invention has the above configuration, it has the following advantages.

During air purge operation, only the pilot gas circuit is opened, so even if there is an ignition error in the initial stage when the pilot burner finishes blowing air and switches to appliance jetting, only the pilot burner will blow out. Since the amount of gas is small, explosive combustion (ignition) occurs when ignition occurs afterwards.
There is no need to worry about this occurring.

Hereinafter, embodiments of the present invention will be described based on the drawings.

The embodiment shown in FIG. 1 is a bathtub with a water heater, in which an appliance main body B is installed near a bathroom wall A, and a bath heat exchanger 1 is communicated with a bathtub C inside the appliance main body.
and a hot water supply heat exchanger 2 are installed in parallel, and a main burner is provided below each of these heat exchangers. A fire burner 5 is provided.

Gas piping is connected to each of these burners from a valve block 7 in the control device 6, and within the valve block there is a water pressure-responsive gas valve of a water supply pipe 8 wound around a heat exchanger for hot water supply, and a gas valve connected to the main burners 3, 4. Furthermore, a solenoid valve for opening and closing the gas circuit to the pilot burner 5 is incorporated, and the control device 6 is electrically connected to an operation panel 9 on the indoor side, and by operating the operation panel 9, the ignition of the appliance is changed. It is configured so that it can be operated up to the point of extinguishing the fire.

Furthermore, the air purge device and pilot flame safety device according to the embodiment of the present invention will be described in more detail with reference to FIG. The ignition plug 11 is installed to be heated by flame, and the ignition plug 11 is also connected to the pilot burner 5.
A solenoid valve 13 is inserted into the pilot gas circuit 12 for the pilot burner 5 . In the illustrated embodiment, the solenoid valve functions as a main valve, and a solenoid valve or a hydraulically responsive gas valve is inserted in each circuit to the other main burners 3 and 4.

Further, in the figure, 14 is a coil of the solenoid valve 13, 15 is a spark generator to which the ignition plug 11 is connected, 16 is a timer, 17 is a thermoelectromotive force detector, and the first normally open output contact of the timer 16 18 and the spark generator 15 are connected in series, and a parallel circuit of this series circuit and the coil 14 is connected in series with the movable contact 20 of the output switch 19 of the thermoelectromotive force detector 17.

One fixed contact 21 of the output switch is connected to the power source E via a first operating switch 22, and the other fixed contact 23 is connected to the power source E via a second operating switch 24 for air purge. Further, the timer 16 is connected in parallel with the circuit below one fixed contact 21 of the output switch 19, and its second normally open output contact 25 is inserted into a short circuit 26 connecting the fixed contacts 21 and 23. . Also, 2
7 is a relay connected in series to the second operation switch 24, and its normally open output contact 28 is connected to the first switch of the timer 16.
The movable contact 2 is connected in parallel with the normally open output contact 18.
0 and the spark generator 15.

In the above, the first operation switch 22 and other normal operation switches (not shown) are provided on the operation panel 9, and are used to control the second operation switch 24, timer 16, spark generator 15, and others. Various devices for this purpose are provided in the main body B of the instrument.

Further, the timer 16 turns on the normally open output contact only during a set time.

The operation of the above embodiment will be explained in further detail.

First, the air purge operation is performed by turning on the second operation switch 24 provided on the instrument body B. At this time,
The fixed contact 23 and the movable contact 20 are closed,
This operation causes the normally open output contact 28 of the relay 27 to open.
turns ON and the circuit to spark generator 15 turns ON.
At the same time, the circuit to the coil 14 is turned on, and only the gas circuit to the pilot burner 5 is opened, and at the same time, discharge is discharged from the plug 11 to the flame hole of the pilot burner 5.

Therefore, even when air is released from the pilot burner 5, the discharge continues, and when all the air in the pilot gas circuit 12 is released and gas begins to blow out, the plug 1
The pilot burner 5 is ignited by the discharge from 1.

When a flame is formed in the pilot burner 5, the thermocouple 10 is heated by this gas flame, and the thermocouple circuit 29
When a predetermined thermoelectromotive force is generated, the thermoelectromotive force detector 17
The fixed contact 23 and movable contact 20 of the output switch 19 are opened by the output, the electric circuit to the spark generator 15 and the coil 14 is turned off, and the pilot burner 5 is extinguished. This means that the air barge in the gas piping has been completed, and by turning off the second operation switch 24 and operating the first operation switch 22 on the operation panel 9, etc., it is possible to test run the appliance.

That is, after the air purge is completed, the thermoelectromotive force detector 1 is activated by returning the thermocouple 10 to its initial state.
There is no output of 7, the output switch 19 returns to its initial state, and the movable contact 20 and one fixed contact 23 are turned on.

Now, if you turn on the first operation switch 22,
The circuit to the timer 16 is turned on, its first normally open output contact 18 and second normally open output contact 25 are closed, and the circuit to the spark generator 15 and solenoid valve 13 is connected to the power supply E and the second normally open output contact. They are connected via the open output contact 25, the fixed contact 23, and the movable contact 20. As a result, the output from the spark generator 15 is applied for a time corresponding to the set time of the timer 16 and discharges from the plug 11 to the pilot burner 5. During this time, a flame is formed in the pilot burner 5 and the thermocouple 10 is heated. When the thermoelectromotive force reaches a predetermined value, the output switch 19 of the thermoelectromotive force detector 17 is activated, and the movable contact 20 is switched to the other fixed contact 21 side.

Then, when the set time of the timer 16 has elapsed, its output contact is opened again and the spark generator 1
The circuit to the coil 14 of the solenoid valve 13 is kept in the ON state by the operation of the output switch 19, and the circuit to the pilot burner 5 is turned OFF.
The circuit to is held open.

If ignition does not occur in the above operation, or if the flame of the pilot burner 5 disappears, the thermoelectromotive force of the thermocouple circuit 29 does not reach the predetermined value or decreases below the predetermined value, and the output switch 19 When the movable contact 20 is left in the initial state or returns to the initial state and the second output contact 25 of the timer 16 is opened, the circuit to the solenoid valve 13 is turned off, the gas circuit is cut off, and subsequent production is disabled. Gas release can be prevented.

After the above-mentioned ignition operation, if a so-called bath use operation is performed to open the gas circuit to the main burner 3 by an appropriate operation, the pilot burner 5 is connected to the main burner 3 by the action of an appropriate control device (not shown). The fire spreads, and the inside of the bathtub C is heated by the action of the bath heat exchanger 1.

Next, when the faucet (not shown) at the tip of the water supply pipe 8 is opened, the water pressure-responsive gas valve in the valve block 7 is operated, and the gas circuit to the main burner 4 is connected, and by the action of the hot water heat exchanger 2. Hot water supply status is established.

As described above, according to the embodiment described above, air purge can be performed simply by operating the second operation switch 24, and other normal operations can also be performed remotely from the operation panel 9 side.

In the illustrated embodiment, the spark generator 1
5 and the solenoid valve 13 are configured to operate continuously or remain open until the end of the air purge, but they may also be operated intermittently at predetermined time intervals. This is possible, and in this case, even if there is an ignition failure in the pilot burner 5 after the air purge is completed, the amount of raw gas released will be further reduced.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of an embodiment of the present invention, and Fig. 2 is an electrical circuit diagram showing the details of the main parts, and in the figure, 5... pilot burner, 10... thermocouple, 12...
Pilot gas circuit, 13... Solenoid valve, 15... Spark generator, 17... Thermoelectromotive force detector, 24...
Second operation switch.

Claims (1)

[Scope of utility model registration request] In gas appliances that are equipped with a thermocouple type pilot fire safety device and are installed outdoors, an air purge operation section is provided separately from the appliance operation section and within the appliance body, and the air purge operation section , a gas appliance in which a solenoid valve inserted to open and close a pilot gas circuit and a circuit to a spark generator are turned ON, and when the thermoelectromotive force in the thermocouple reaches a predetermined value, the circuit is turned OFF. air purge device.