JPS6262127A - Combustion device - Google Patents

Abstract

PURPOSE:To enable a condition of lack of oxygen to be detected by one burner by a method wherein one burner can be changed over from its burner by a method wherein one burner can be changed over from its full primary combustion to its Bunsen type combustion. CONSTITUTION:Indoor air is sucked through a suction port 7, heated by a burner 3 and then blown out through a blowing port 8. A thermocouple 9 acting as a sensor for detecting a lack of oxygen is placed adjacent to a combustion surface of the burner 3, and at the same time a solenoid safety valve 11 opened or closed in response to an output from the thermocouple 9 and a governor 12 are arranged in a gas supplying passage 10. The thermocouple 9 is made such that when the burner 3 shows a Bunsen type combustion to indicate a lack of oxygen, its flame is lifted up to decrease its output. When the condition is set 'strong', both solenoid opening or closing valves 13a and 13b are opened to cause gas to be injected from both nozzles 14a and 14b to allow burner 3 to show a Bunsen type combustion. In turn when the condition is set at its 'weak' state, only the solenoid opening or closing valve 13b is opened to cause gas to be injected only through a nozzle 14b to allow the burner 3 to perform a full primary combustion.

Description

[Detailed description of the invention] (Industrial application field) Is this invention fu? This article relates to the combustion equipment of the heater.

(Prior Art) As a conventional device of this kind, one is known in which an electromagnetic safety valve installed in a fuel supply path to a burner is opened and closed by the output of an oxygen deficiency sensor.
In order to achieve this, the burner is composed of an all-primary type, and a Bunsen-type constant-fire burner, which is easy to detect oxygen deficiency, is installed separately from the burner, and the oxygen deficiency sensor is placed in front of this to detect the oxygen deficiency state. and closes the electromagnetic safety valve based on the detection output;
The burner is composed of two burners for switching strength, one of which is of the all-primary type and the other of which is of the Bunsen type. There is a device that detects an oxygen deficiency state and closes the electromagnetic safety valve based on the detection output.

(Problems to be Solved by the Invention) However, in both of the above cases, there is an inconvenience that the oxygen deficiency state cannot be detected without two burners. It is also desirable to be able to detect oxygen deficiency conditions.

(Means for Solving the Problems) The present invention provides a device that does not satisfy the above-mentioned needs, and which opens and closes an electromagnetic safety valve interposed in a fuel supply path to a burner based on the output of an oxygen deficiency sensor. In what was done,
The present invention is characterized in that one burner can be freely switched between all-primary type combustion and Bunsen type combustion.

(Function) The present invention has the above configuration, and when checking whether or not the burner is in an oxygen-deficient state, the burner used in all-primary combustion is switched to Bunsen combustion, and If there is an oxygen deficiency, the electromagnetic safety valve is closed by an output from an oxygen deficiency sensor that detects this, and combustion of the burner is stopped. In this way, an oxygen deficiency state can be detected with a single low NOx burner.

(Example) Next, the present invention will be explained based on illustrated embodiments.

FIGS. 1 and 2 show an embodiment in which the present invention is applied to a fan heater. It consists of a casing (4) and an air supply fan (5), and when the burner (3) and the air supply fan (5) operate, the indoor air flows through the suction port with the filter (6) on the back side. After being sucked in from (7) and heated by the burner (3), the combustion IM
Part 1 as 1ffl from the front air outlet (8) with air
) It was made to be sucked out in the a direction.

In this case, the combustion surface of the burner (3) is exposed to heat lightning (9) with an amount of oxygen deficient gas, and the burner (3) is
), an electromagnetic safety valve C11) that opens and closes according to the output of the thermal lightning pair (9), and a governor (+21) that adjusts the gas pressure are interposed in the gas supply path aO, which is a fuel supply path connected to the thermal lightning pair (9). 9) is when the burner (3) is performing Bunsen combustion, and when the burner (3) is in an oxygen-deficient state, the flame lifts and the output is reduced.

Further, the gas supply passage (10) is connected to the first gas supply passage (10a) and the second gas supply passage (10b) on the downstream side of the governor (2).
The first and second supply paths (10a) (1
o h ) is provided with an electromagnetic on-off valve (13) in the middle thereof, a nozzle ('lΦ) is provided at its tip, and both nozzles (14a) (
14b) was made to face the mixing tube (3a) of the burner (3). In the case shown in the figure, the burner (3) is configured to be of a strength switching type that is linked to the room heater.In this case, the air supply fan (5) is linked to the room heater and the air volume is adjusted, as shown in Figure 3. The first gas supply path (1
The nozzle (Ma) connected to the second gas supply path (10b) is shaped to make it difficult to supply air, and the nozzle (14) connected to the second gas supply path (10b)
b) into a shape that makes it easy to supply air, and when the setting is "strong", both electromagnetic valves 1311 (13a) (13b) are opened and both nozzles (
Gas is ejected from the burner (14a) (14b) and the burner (
3) to produce a Bunsen-style combustion, and when it is "weak", only the electromagnetic on-off valve (13b) is opened and the nozzle (1
Gas was ejected only from 4b), and the burner (3) was configured to perform all-primary combustion.

Note that, unlike what is shown in the figure, both nozzles (1
4a) (14b) to set the burner (3) to all-primary combustion, and when the nozzle (14
It is preferable to use only a) and make the burner (3) perform Bunsen-style combustion.

Further, in the illustrated nozzle (14a), the shape is such that it is difficult to supply air, but the nozzle (14a,) may have the same shape as the nozzle (14b), which is easy to supply air, and an obstacle may be placed in front of the nozzle (14b). In the case described below, the intensity is switched by a room thermostat, but in other words, the burner (3) is periodically switched from all-primary type combustion to Bunsen type combustion. A switching means may be added to periodically detect the oxygen deficiency state.

In addition to the embodiments described above, there are the following embodiments as the structure of the burner (3).

One is to have two nozzles (14a) (14b) facing the mixing pipe (3a) of the burner (3), similar to those shown in Figure 3, and open only the electromagnetic 1tu closing valve (13a). Only the nozzle (14a) is used, the burner (3) is set to Bunsen-style combustion, and the electric VIf1 on-off valve (
13b) is opened and only the nozzle (14b) is used, and the part (3) is burnt in an all-primary type.The two are the mixing pipe (3a) of the burner (3). to 1
The nozzle of the book is faced, and the number of rotations of the air supply fan (5) in the fan heater body (2) is changed to temporarily change the air suction claw, and the barb (3) is used for Bunsen-style combustion. J, which can be freely switched to full-air combustion, is a sea urchin. In these cases, it is assumed that the burner (3) is switched from full-primary combustion to Bunsen combustion periodically using a timer element.

In any of the above embodiments, when the burner (3) is used for Bunsen-style combustion, it is possible to check whether or not it is in an oxygen-deficient state using the thermal lightning pair (9), and if it is in an oxygen-deficient state, It is safe because combustion of the burner (3) can be stopped by closing the electromagnetic safety valve 0v.

(Effects of the Invention) As described above, according to the present invention, one burner is configured to be switchable between all-primary type combustion and Bunsen type combustion in which an oxygen deficiency state can be detected. There is no need for a dedicated burner for detecting oxygen deficiency, and the valve structure is simple and inexpensive.

[Brief explanation of drawings]

FIG. 1 is a low-level front view showing an embodiment of the apparatus of the present invention, FIG. 2 is a low-level side view thereof, and FIG. 3 is a low-level front view showing the main parts thereof.

Claims (1)

[Claims] In a device in which an electromagnetic safety valve installed in a fuel supply path to a burner is opened and closed by the output of an oxygen deficiency sensor, 1
A combustion device characterized in that a book burner is configured to be freely switchable between all-primary type combustion and Bunsen type combustion.