JPH02242016A - Gas combustion equipment - Google Patents

Abstract

PURPOSE:To eliminate a dangerous condition of an explosion combustion and the like by carrying out a pre-purging operation when gas component is present within a combustion chamber in case of combustion starting and eliminate a loss time in respect to an object of application of use of equipment by a method wherein a pre-purging of a specified time is carried out after detecting operation of a gas sensor, gas is ignited after than and the pre-purging is eliminated in case of no sensing of the gas component with the gas sensor. CONSTITUTION:As a gas sensor 3 detects that there is a gas component near an ignition plug 11, a forced aeration fan F is rotated to cause remained raw gas within a combustion chamber 2 to be discharged out of a discharging port 7. Upon completion of prepurging, a fan and a main solenoid valve are turned on. Combustion air for a gas burner 1 and a fuel gas for a gas burner 1 are supplied, the gas burner 1 is ignited and the mixture gas is ignited. As the gas sensor 3 detects that there is no gas component in the combustion chamber 2, the fan and the main solenoid valve are turned on so as to supply combustion air for the gas burner 1 through a forced aeration fan F and to supply fuel gas to the gas burner 1 under a released state of the main solenoid valve after turning on the fan and the main solenoid valve.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a gas combustion device, such as a forced air supply/exhaust type water heater, which is equipped with a fan for forced ventilation in the air supply/exhaust path of a gas burner.

[Conventional technology]

As shown in Figure 3, conventional gas combustion equipment of this type performs pre-purging for a certain period of time at the start of combustion, then turns on the fan and main solenoid valve to ignite combustion, and after combustion stops. Generally, the structure is such that a top purge is performed for a certain period of time.

[Problem to be solved by the invention]

In the above conventional technology, pre-purge is performed at the start of combustion regardless of the presence or absence of gas components in the combustion chamber, and post-purge is performed after combustion has stopped, so the pre-purge time at the start of combustion is particularly 1.5 seconds. Although it is about ~3 degrees, it is a loss time compared to the intended use of the equipment. for example,
Forced supply/exhaust water heaters, etc., have problems such as not only being inconvenient to use because the start of hot water is delayed during the pre-purge time, but also being uneconomical due to a large amount of discarded hot water. .

This invention was made in view of the problems of the conventional technology, and its purpose is to perform pre-purging when there is a gas component in the combustion chamber at the start of combustion to prevent dangers such as explosive combustion. To provide a gas combustion device which eliminates loss time for the purpose of use of the device and improves usability by omitting pre-purge when there is no gas component in the combustion chamber for safety.

[Means to solve the problem]

In order to achieve the above object, the gas combustion equipment of the present invention is a forced air supply/exhaust type gas combustion equipment equipped with a forced ventilation fan in the supply/exhaust path of a gas burner, and the gas combustion equipment is a forced air supply/exhaust type gas combustion equipment that includes a forced ventilation fan in the supply/exhaust path of a gas burner. A gas sensor for detecting the presence or absence of a component is provided, and combustion control means is provided for performing pre-purging for a certain period of time after detection by the gas sensor, and then turning on the forced ventilation fan and the main solenoid valve to cause ignition combustion, and The apparatus is equipped with a prepurge omitting means that skips the prepurge and turns on the fan and the original solenoid valve to cause ignition and combustion when the gas sensor does not detect a gas component.

[For production]

In the gas combustion equipment according to the present invention configured as described above, at the start of combustion, the gas sensor provided in the combustion chamber first detects the presence or absence of gas components, and as a result, the gas sensor installed in the combustion chamber detects the presence or absence of gas components. If there are gas components such as residual raw gas or combustion exhaust gas, perform pre-purging for a certain period of time to release the residual raw gas in the combustion chamber to the outside, then turn on the fan and main solenoid valve and turn on the forced ventilation fan. Combustion air is supplied to the gas burner by rotation, and fuel gas is supplied to the gas burner by opening the main AM valve, thereby igniting the gas burner and causing combustion. In addition, as a result of detecting the presence or absence of the above gas components, if there is no gas component such as residual raw gas in the combustion chamber, pre-purge is skipped, the fan and the magnetic valve are turned on, and the forced ventilation fan is rotated to cause combustion in the gas burner. In this method, the gas burner is ignited and burned by supplying air for use and supplying fuel gas to the gas burner by opening the main solenoid valve, thereby omitting the pre-purge.

[Embodiment] An embodiment of the gas combustion equipment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment applied to a forced air water heater equipped with a forced ventilation fan F on the upstream side of the supply/exhaust path of a gas burner 1, in which 1 is a gas burner installed at the bottom of a combustion chamber 2. By heating the heat exchanger 4 installed in the upper part of the combustion chamber 2, the temperature of the cold water flowing through the heat exchanger is increased.

Fl is a forced ventilation fan, and its outlet 5 is connected and opened to the lower part of the combustion chamber 2, and the air from the forced ventilation fan F is distributed and rectified evenly in each part with a rectifying plate 6 in the lower part of the combustion chamber 2. It is forcibly supplied as combustion air to the gas burner 1 in the upper part, and the combustion exhaust gas is forcibly pushed out and discharged from the upper exhaust lower. Also,
Reference numeral 8 denotes a gas nozzle pipe for supplying gas to the gas burner L, and the gas nozzle pipe 8 includes a gas supply pipe 1 equipped with a gas valve 9.
0 is connected. In addition, 11 in the figure is a spark plug, 1
Reference numeral 2 denotes an air volume adjusting damper provided at the outlet 5 of the forced ventilation fan F.

Reference numeral 3 denotes a gas sensor provided near the gas outlet of the combustion chamber 2 of the forced air water heater, that is, near the flame port of the gas burner 1 and near the ignition plug 11, which includes a gas component detection means and a prepurge omitting means. and a control box C consisting of combustion control means. This gas sensor 3 detects whether or not gas components such as raw gas and combustion exhaust gas remaining between the gas pulp 9 of the gas supply pipe 10 and the gas burner 1 are present in the combustion chamber 2 after combustion has stopped. When the sensor 3 detects that there is a gas component near the spark plug 11 in the combustion chamber 2, the forced ventilation fan F rotates and pre-purges the remaining raw gas in the combustion chamber 2 to the outside from the exhaust lower. is carried out for a predetermined period of time (for example, about 2 seconds), and after the prepurge is completed, the fan and the original solenoid valve are turned on (the fan will continue to operate), and combustion air is supplied to the gas burner 1 by the rotation of the forced ventilation fan F. and supplying fuel gas to the gas burner 1 by opening the original Tl magnetic valve, and the gas burner 1 is ignited and burned.

When the gas sensor 3 detects that there is no gas component in the combustion chamber 2, the fan and the solenoid valve are turned on, and the forced ventilation fan F supplies combustion air to the gas burner 1 and the solenoid valve is opened. The fuel gas is supplied to the gas burner 1 by the above, and the gas burner 1 is ignited and combusted, thereby omitting pre-purge and immediately starting the hot water supply system.

An example of the combustion control path of a forced air water heater to which the above configuration is applied will be explained below based on FIG. 2. Step 1
At step 01, combustion is started, that is, when hot water is supplied, at step 102, the ta switch is first turned on, and at step 103.
When the hot water tap is opened, water supply to the heat exchanger 4 is started, and when the water flow switch provided in the water supply path is normally turned on by the water pressure in step 104, step 10
Proceed to step 5, and the gas sensor 3 installed inside the combustion chamber detects the presence or absence of gas components. As a result, if there is a gas component such as residual raw gas or combustion exhaust gas in the combustion chamber 2, the forced ventilation fan F is rotated. Then, the process proceeds to step 106 where a pre-purge is performed for a predetermined period of time (approximately 2 seconds) to release the raw gas remaining in the combustion chamber 2 to the outside. When this pre-purge is completed, the fan continues to be turned on in step 107 and the original electromagnetic The valve is turned on, and the forced ventilation fan F supplies combustion air to the gas burner 1, and the main solenoid valve is opened to supply gas to the gas burner 1. In step 108, the gas burner 1 is ignited and combusted, and in step 109. Enters combustion control to supply hot water at the set temperature. Combustion then continues until the water flow switch is turned off in step 110. When the hot water tap is closed, the water flow switch is turned off, the fan and the main solenoid valve are turned off in step 111, combustion is stopped (step 112), and the process returns to step 103.

When hot water is to be supplied again, the hot water supply tap is opened, and the combustion control path reaches ①-②, and hot water supply starts according to the above-mentioned principle.

The control means controls the gas sensor 3 in step 105.
Detects the presence or absence of a gas component, and as a result, there is a gas component in the combustion chamber 2. However, the gas sensor 3 detects the presence or absence of a gas component, and as a result, there is no gas component in the combustion chamber 2. If so, skip the prepurge step 106 and proceed to step 107, turn on the fan and the original solenoid valve, rotate the forced ventilation fan F, open the original solenoid valve, and proceed with the above-mentioned control means.

In addition, since safety is improved by implementing this invention, it is possible to omit or shorten the time required for the conventionally performed boss purge, which discharges combustion exhaust gas, etc. from the combustion chamber to the outside after combustion is stopped. .

[Effects of the Invention] Since the present invention has the configuration described above, it produces the following effects.

This is a forced air supply/exhaust type gas combustion device, which is equipped with a gas sensor that detects the presence or absence of gas components in the combustion chamber, performs pre-purge for a certain period of time after detection by the gas sensor, and then turns on the fan and the original solenoid valve. The present invention is equipped with a combustion control means that turns on to cause ignition and combustion, and also includes a prepurge omitting means that skips the prepurge and turns on the fan and the original solenoid valve to cause ignition and combustion when the gas sensor does not detect a gas component. Residual raw gas in the combustion chamber that does not require pre-purging,
Since prepurge is omitted when there is no gas component such as combustion exhaust gas, there is no loss time required for prepurge at the start of combustion. Therefore, for example, when applied to a forced air water heater or the like, the heating speed (rise) is faster, so there is no delay in the start of hot water, and there is no wasted hot water, so usability and economical efficiency are significantly improved.

Note that if there is a gas component in the combustion chamber at the start of combustion, pre-purging is performed as in the past to eliminate dangers such as explosive combustion and ensure safety.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of a gas combustion device according to the present invention, FIG. 2 is a flow sheet of its combustion control path, and FIG. 3 is a flow sheet of the conventional example. Combustion chamber, 3... Gas sensor gas burner, F... Forced ventilation fan, 2...
・Figure 2 Figure 3

Claims (1)

[Claims] A forced ventilation fan (
F) is a forced air supply/exhaust type gas combustion equipment equipped with a gas sensor (3) for detecting the presence or absence of a gas component in the combustion chamber (2) of the gas combustion equipment; In the case where combustion control means is provided to pre-purge for a certain period of time after detection, and then turn on the forced ventilation fan (F) and the original solenoid valve to ignite and burn, and the gas sensor (3) does not detect a gas component. is a gas combustion device equipped with a prepurge omitting means that skips the prepurge and turns on the fan (F) and the original solenoid valve to cause ignition and combustion.