JPS5823080Y2 - gas combustion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an open type gas combustion device such as a gas water heater, and particularly relates to an improvement in a device for preventing incomplete combustion due to lack of oxygen.

Recently, an increasing number of housing structures have become nearly airtight to the outside air, and when open gas combustion devices such as small water heaters are used for long periods of time, the indoor air can emit CO2 contained in the exhaust gas. contaminated with nonflammable gases such as

This also reduces the oxygen concentration in the room, which is harmful to the user's health, and if the user continues to use the device without being aware of this, the main burner of the gas appliance may cause incomplete combustion, which may lead to poisoning.

In order to avoid such undesirable situations, we have developed a pilot burner for indoor air monitoring that detects an increase in nonflammable gas such as CO2 in the air around the gas combustion equipment and automatically stops gas combustion. was considered.

In recent years, this pilot burner has attracted attention from the standpoint of accident prevention, and this device has been strongly desired.

Here, the principle of the pilot burner will be briefly explained.

Gas supply to this pilot burner and the main burner of the gas appliance is controlled by a common solenoid valve.

The configuration C includes a nozzle portion consisting of an inner tube having a gas communication hole communicating with the gas supply pipe, and an outer tube attached to the inner tube having a gas outlet for gas flowing through the communication hole. , a primary air supply port that supplies primary air to the gas ejected from this nozzle, a burner tube that discharges the gas mixed with the primary air to the outside and burns it, and a burner tube located near the flame port of this burner tube. and a combustion state detection device that detects the combustion state of the engine and generates an output.

The gas ejection port of the nozzle part is formed by attaching a ruby chip with fine ejection holes through it so as to face a conduction hole formed in the inner tube, and its diameter is LP.
In the case of gas, it is approximately 0.3φ.

Further, the primary air supply port has an air volume adjustment plate that is provided to open and close by thermal deformation of the bimetal, and when the air volume adjustment plate is closed, it supplies an appropriate amount of primary air and When the air amount adjusting plate is opened, an excessive amount of primary air is supplied to make the combustion state of the pilot burner slightly lifted.

Furthermore, a non-combustible heat insulating tube such as ceramic is fitted to the combustion port at the tip of the burner tube to prevent red heat caused by combustion, and the output of the combustion state detection device is connected to the gas supply path. It is added to the provided solenoid valve to close the solenoid valve.

Next, the operation of the pilot burner having the above configuration will be explained.

First, the solenoid valve provided in the gas supply path is artificially and temporarily opened, gas is supplied to the pilot burner and the main burner, and the pilot burner is ignited by a desired ignition means, and the pilot burner is ignited. The flame ignites the main burner.

In this case, since the pilot burner is initially at a low temperature, the air amount adjusting plate is closed and an appropriate amount of primary air is supplied from the primary air supply port to maintain a normal combustion state.

The combustion state detection device generates an output due to this combustion in the pilot burner, and keeps the solenoid valve provided in the gas supply path open.

When the combustion continues and the bimetal is thermally deformed and the air amount adjustment plate is opened, an excessive amount of primary air is supplied from the primary air supply port, and the combustion state of the pilot burner becomes slightly lifted, and in this state, combustion occurs. Continue.

In this slightly lifted state, the twin burners and pilot burner continue to burn for a long time, causing CO and CO to enter the indoor air.
When 2nd class increases and oxygen decreases, this indoor air becomes 1
Next, the combustion rate of the mixed gas that burns as air becomes slower,
As a result, the combustion in the pilot burner, which had been burning with a slight lift until then, finally lifts and is blown out.

When combustion in the pilot burner stops in this way, the combustion state detection device detects this and no longer generates an output to keep the solenoid valve installed in the gas supply path open, and the solenoid valve closes and Gas supply to the burner and main burner is stopped to prevent incomplete combustion by the main burner.

As described above, the pilot burner is effective as an incomplete combustion prevention device for gas combustion equipment, but in actual use, the mutual arrangement of the main burner, pilot burner, and combustion state detection device is inappropriate. In this case, the incomplete combustion prevention function described above cannot be fully exhibited.

In other words, since the pilot burner is also used for igniting the main burner as mentioned above, its combustion flame is located near the combustion part of the main burner, so both the main burner and the pilot burner are ignited. In such a situation, even if the combustion flame of the pilot burner becomes lifted due to indoor air pollution, the pilot burner may continue to burn due to the combustion flame of the main burner.

Further, as the combustion state detection device, a device whose detection operation reacts to the heat of the combustion flame of the pilot burner is used, but in this case, the combustion state detection device may malfunction in response to the radiant heat of the main burner.

Even if a pilot burner is provided in this way, it may not be able to fully demonstrate its function depending on the arrangement of the pilot burner in its usage state.

The purpose of this invention is to eliminate interference caused by the combustion flame of the main burner and sufficiently prevent incomplete combustion by the pilot burner, etc. by properly arranging and configuring the main burner, pilot burner, and combustion state detection device. The object of the present invention is to provide a gas combustion device that can be used to achieve maximum performance.

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

In the figure, 10 is a main burner, 11 is a pilot burner, and their flame ports are arranged to face the combustion section of the main burner 10.

The pilot burner 11 and the main burner 10 have their gas supply controlled by a common solenoid valve (not shown) provided in the gas supply path, and although not shown in detail, the primary air supply is controlled as described above. An air flow control valve installed at the mouth is configured to make the normal combustion state slightly lifted.

Reference numeral 12 denotes a combustion state detection device for the pilot burner 11, for example, a thermocouple is used, and the detection portion, that is, the heat sensitive portion 12. is attached so as to be located near the flame opening of the pilot burner 11 as shown in the figure.

13 is an electrode for ignition, 14 is a holding plate for this electrode 13, 1
Reference numeral 5 designates an auxiliary burner for ignition, and the holding plate 14 includes a guide portion 14.5 that guides gas ejected from the auxiliary burner 15 to the tip of the electrode 13. When a voltage is applied to the electrode 13, a spark is generated at the portion facing the electrode 13, and the gas from the auxiliary burner 15 is ignited.

16 is a heat shield plate, which connects the main burner 10 and the thermocouple 12;
Heat sensitive part 12. The radiant heat from the combustion section of the main burner 10 is
Heat sensitive part 12. I try not to join in.

Moreover, the pilot burner 11 side of this heat shield plate 16 is
As shown in FIG. 2, the combustion flame generated from the flame port of the pilot burner 11 is bent toward the flame port of the pilot burner 11, and the combustion flame generated from the flame port is transmitted to the heat sensitive portion 12 of the thermocouple 12 as shown in the figure. and main burner 1
The flow is divided so as to lead to the combustion section of 0.

Next, the action will be explained.

First, an ignition handle (not shown) is operated to artificially open the solenoid valve (not shown) provided in the gas supply path, gas is jetted out from the auxiliary burner 15 and the pilot burner 11, and a voltage is applied to the electrode 13. , the gas from the auxiliary burner 15 is ignited, and the pilot burner 11 is ignited by this ignition flame.

When pilot burner 11 is ignited, auxiliary burner 1
The gas ejection from 5 will stop.

The thermocouple 12 transfers the combustion flame separated by the heat shield plate 16 from the pilot burner 11 to the heat sensitive section 12. is provided to output a thermoelectromotive force, which is applied to the solenoid valve to maintain the solenoid valve in an open state.

Here, a combustion valve (not shown) that is manually operated is provided in the gas supply path to the main burner 10, so that even if the solenoid valve is opened, gas does not immediately blow out.

As mentioned above, the pilot burner 11 is arranged facing the main burner 10, and its combustion flame is separated by the heat shield plate 16 and is located near the combustion part of the main burner 10. When the main burner 10 opens to eject gas, the ejected gas is ignited by the combustion flame from the pilot burner 11, and combustion begins in the main burner 10.

Note that if this gas combustion device is a water heater, the combustion valve (not shown) and the water supply valve are linked, and the main burner 10
By supplying water into a heating tank (not shown) at the same time as the combustion starts, hot water can be obtained instantaneously.

As described above, the combustion flame of the pilot burner 11 is slightly lifted even during normal combustion.

Therefore, when the indoor air becomes contaminated and its combustion speed decreases, the combustion flame is lifted as shown in FIG. The tip of the lifted combustion flame of the burner 11 is burned on the combustion section of the main burner 10 by the combustion flame of the main burner 10.

However, since the pilot burner 11 has not yet started combustion near the bent portion of the heat shield plate 16, the combustion flame from the pilot burner 11 does not reach the heat sensitive portion 12a of the thermocouple 12.

□ Also, the heat sensitive part 12 of this thermocouple 12. is separated from the main burner 10ρ combustion section by a heat shield plate 16 and does not receive radiant heat from the combustion flame of the main burner 10.

Therefore, the heat sensitive part 12. The ambient temperature of the thermocouple 12 decreases, and the thermoelectromotive force of the thermocouple 12 also decreases.

As a result, the solenoid valve provided in the gas supply path cannot remain open and closes, cutting off the gas supply to the main burner 10 and pilot burner 11, thereby preventing incomplete combustion.

□As described above, according to the present invention, a heat shield plate is provided between the main burner and the combustion state detection device to prevent radiant heat from the combustion section of the main burner from reaching the detection section of the combustion state detection device. By bending the end of the heat shield plate toward the pilot burner's flame opening, the bent part of the heat shield plate is located in the same direction as the jetting direction of the combustion flame of the pilot burner, and the flame of the pilot burner is bent. Therefore, the combustion flame of the pilot burner can be guided smoothly to the combustion part of the main burner and the detection part of the combustion state detection device without resistance, so that the main burner can be ignited by the pilot burner. In addition to being reliable, it is also possible to accurately detect the lift of the pilot burner's combustion flame due to indoor air pollution, making full use of the pilot burner's inherent ability to prevent incomplete combustion.
Safe gas combustion can be performed.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of the gas combustion apparatus according to the present invention, Fig. 2 is a plan view of a part thereof, and Fig. 3 shows the combustion flame of the apparatus shown in Fig. 1 in a lifted state. It is a front view. 10... Main burner, 11... Pilot burner, 12... Combustion state detection device, 16... Heat shield plate.

Claims (1)

[Scope of utility model registration request] A main burner, a pilot burner whose flame port is arranged toward the combustion part of the main burner and which burns with a slight lift under normal conditions, and a combustion state detection output generated by receiving the combustion flame of the pilot burner, which is connected to the main burner and the pilot burner. A combustion state detection device that opens and closes a solenoid valve provided in a gas supply path common to the burners, and a combustion state detection device that is arranged to partition between the combustion state detection device and the main burner, and has an end connected to the flame port of the pilot burner. 1. A gas combustion device comprising: a heat shield plate that is bent toward the direction of the pilot burner to separate the combustion flame from the pilot burner so as to guide the combustion flame to the main burner and the combustion state detection device.