JPH0622750U - Burner oxygen deficiency detection structure - Google Patents

Abstract

(57) [Summary] [Purpose] In a burner that forms a flame for detecting oxygen deficiency in a part of the flame mouth, the structure is simplified to reduce the manufacturing cost and the durability is also improved. [Structure] A step h is formed by obliquely cutting a part of a flame opening 1 to form a flame b for oxygen deficiency detection, and a temperature detection sensor 2 is provided outside the step h inside a flame b for oxygen deficiency detection. The tip temperature measuring unit 3 is inserted into and installed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a burner oxygen deficiency detection structure.

[0002]

[Prior art]

 Main burners such as gas water heaters are pre-made so that the combustion flame does not lift even in low oxygen conditions, so a temperature detection sensor (for example, thermocouple) that opens and closes the electromagnetic safety valve is inserted in the combustion flame. When detecting oxygen deficiency, the electromotive force changes little even when incomplete combustion occurs due to oxygen deficiency.

Therefore, incomplete combustion due to oxygen deficiency cannot be detected at an early stage with high accuracy, resulting in a lack of safety.

Therefore, as a burner for solving the above-mentioned problems, a large number of conventional burners have been disclosed, for example, in Japanese Unexamined Patent Publication No. 64-46517 and, as shown in FIG. In a burner having parallel flame holes, a plate guide plate 15 in an inclined posture is provided in a part of the flame hole 1, and the plate guide plate 15 forms an independent outer flame hole portion 1a. The combustion flame F is a flame to be detected by the thermocouple 12, and a combustion flame protruding from the side edge of the burner body 2 to the outside in the secondary air flow path in a posture inclined with respect to the upward secondary air flow direction. By doing so, there is a structure in which the lift of the flame to be detected is early and remarkably generated by the action of the secondary air at the time of oxygen deficiency.

[0005]

[Problems to be solved by the device]

 In the above-mentioned conventional technique, the plate-shaped guide plate 15 in the inclined posture is provided at the flame mouth portion forming the flame to be detected to form the independent combustion flame F for detecting the oxygen deficiency. In addition, the manufacturing process requires a lot of labor and high technology, resulting in high cost. Also, since the plate-shaped guide plate 15 is red-heated by the combustion flame F, it is burned and deteriorated at an early stage and lacks durability. There was a point.

In view of the above problems of the prior art, the present invention aims to provide a burner oxygen deficiency detection structure having a simplified structure with low cost and excellent durability.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the burner oxygen deficiency detection structure according to the present invention is provided with a large number of flame openings arranged in parallel, as shown in the drawings corresponding to the embodiments. In a burner provided with a flame opening 1 for forming a flame for oxygen deficiency detection, a flame b for oxygen deficiency detection is formed by bulging a part of the flame a outward in the flame opening 1. The main feature is that a step h 2 is provided, and the temperature detecting sensor 2 is installed outside the step h by inserting the tip temperature detecting portion 3 into the flame b for detecting oxygen deficiency.

Further, it is also characterized in that a step h is provided by notching a part of the flame opening 1 in an oblique shape.

[0009]

[Action]

 Since the burner oxygen deficiency detection structure of the present invention is configured as described above, part of the flame a (one side of the base end) bulges outward due to the step h and flows upward on the side of the burner. A flame b for detecting oxygen deficiency, which is protruding into the secondary air flow, is formed integrally with a part of the flame a.

Therefore, when incomplete combustion occurs due to oxygen deficiency, the lift of the flame b for oxygen deficiency detection becomes faster than that of the other parts due to the action of the secondary air flow, so the tip temperature detection in the flame b for oxygen deficiency detection is performed. The oxygen deficiency detection by the temperature detection sensor 2 having the portion 3 inserted therein is performed early and accurately.

[0011]

【Example】

 An embodiment of the burner oxygen deficiency detection structure according to the present invention will be described below with reference to the drawings.

1 to 3, reference numeral 1 denotes a burner A having a large number of flame ports 4 arranged in parallel, and a flame port portion for forming an oxygen deficiency detecting flame b provided at a part of the flame ports 4. Then, a part h (one side of the upper end) of the flame opening part 1 is obliquely cut out to form a step h, and a part of the flame a (one side part of the base end) is bulged outward by the step h. The flame b for detecting oxygen deficiency is integrally formed.

The flame b for oxygen deficiency detection protrudes into the secondary air flow c flowing upward on the side of the burner, and promotes combustion by the action of the secondary air flow c during normal combustion. At the time of incomplete combustion due to lack, the lift is accelerated by the action of the secondary air flow c.

In the burner of the embodiment, the flame port 4 is partitioned by the partition plate 5 into the outer flame port 4a and the inner flame port 4b, and the upper end of the outer flame port 4a is notched obliquely to form the step h. It is provided. However, although not shown, the entire flame port 4, that is, the outer flame port 4a and the inner flame port 4b may be cut out obliquely to form a step, or may be cut in any shape instead of obliquely. It is also free to provide steps. And, of course, it can also be applied to a burner with a single mouth.

Reference numeral 2 denotes a temperature detection sensor (thermocouple), which is installed by inserting the tip temperature detection unit (hot junction) 3 into the flame b for detecting the oxygen deficiency. The temperature detecting sensor 2 is connected to the electromagnet of the electromagnetic safety valve, and the electromagnetic safety valve is held in an adsorbed open state at the time of ignition and combustion, and is automatically closed at the time of extinguishing or blowing out to ensure safety.

In the above-described structure, the flame a formed in the flame mouth portion 1 has a basal end one side portion thereof bulging outward due to the step h, and a secondary portion of the flame a flowing upward in the side portion of the burner. Since the flame b for detecting oxygen deficiency is formed integrally in the air flow c, the secondary air flow c sufficiently acts on the flame a during normal combustion to promote the combustion and to perform stable combustion.

On the other hand, shortly before the incomplete combustion due to oxygen deficiency occurs, the secondary air flow c of low oxygen concentration acts on the flame b 1 for detecting oxygen deficiency, so that the lift is lifted due to the decrease in combustion speed. Prematurely, the flame a lifts into the shape as shown by a'in FIG.

However, the tip temperature detecting portion 3 inserted in the flame b for detecting oxygen deficiency is not heated, and the heating temperature thereof is rapidly lowered. Therefore, the oxygen deficiency detection by the temperature detection sensor 2 is early, And it is performed with high accuracy.

[0019]

[Effect of device]

 In the burner oxygen deficiency detection structure according to the present invention, a step is provided at a part of a flame opening forming a flame for oxygen deficiency detection, and a part of the flame bulges outward and flows upward on the side of the burner. Since the flame for detecting oxygen deficiency that is protruding into the next air flow is formed integrally with a part of the flame, its structure is extremely simple. Since it is only necessary to cut out a part in an oblique shape, the manufacturing cost is significantly reduced.

Further, since the flame for detecting oxygen deficiency is formed by the step, there is no burnout deterioration of the step, and therefore the durability is excellent.

[Brief description of drawings]

FIG. 1 is a sectional side view showing an embodiment of a burner oxygen deficiency detection structure according to the present invention.

FIG. 2 is a partial front view.

FIG. 3 is a sectional view of only a main part.

FIG. 4 is a sectional view of only a main part of a conventional example.

[Explanation of symbols]

 1 Flame mouth a Flame b Flame for detecting oxygen deficiency 2 Temperature detection sensor 3 Temperature detector

Claims (2)

[Scope of utility model registration request] 1. A burner in which a plurality of flame openings are arranged in parallel, and a flame opening (1) for forming a flame for detecting oxygen deficiency is provided in a part of the flame openings in the burner (1). Is provided with a step (h) that bulges a part of the flame (a) outward to form a flame (b) for detecting oxygen deficiency, and the temperature detection sensor (2) is provided outside the step (h). An oxygen deficiency detection structure for a burner, characterized in that a tip temperature measuring part (3) is inserted and installed in a flame (b) for oxygen deficiency detection. 2. The burner oxygen deficiency detection structure according to claim 1, wherein a part of the flame opening (1) is notched obliquely to provide a step (h).