Anti-backfire structure and stove

Abstract

The anti-backfire structure comprises a furnace end assembly, a gas inlet pipeline and an electromagnetic valve, the gas inlet pipeline is connected with the furnace end assembly, the electromagnetic valve is arranged on the gas inlet pipeline, a thermocouple and a temperature detection component are arranged on the furnace end assembly, and the electromagnetic valve is electrically connected with the thermocouple and the temperature detection component. The thermocouple and the electromagnetic valve form a main circuit, and the temperature detection component and the electromagnetic valve form an auxiliary circuit. According to the anti-backfire structure, a thermocouple double-wire structure is adopted, the main wire controls normal on-off of the electromagnetic valve, the auxiliary wire controls backfire prevention, the auxiliary wire is connected with the temperature probe, and the temperature probe is fixed on the furnace end injection pipe, so that when the stove is about to backfire, the internal temperature of the injection pipe suddenly rises, and the backfire is prevented. The alloy temperature probe can generate reverse thermoelectric force larger than that of the main circuit, so that the electromagnetic valve is closed, the purpose of cutting off the gas source is achieved, backfire prevention of the stove is achieved in a real sense, the temperature probe does not need to be connected with a controller to control on-off of a gas circuit, and therefore cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of stoves, in particular to an anti-backfire structure and a stove. Background Art

[0002] During the combustion process of a gas stove, backfire often occurs due to changes in the gas composition and gas pressure. Backfire will damage the gas stove and, in severe cases, may burn the stove's fire cover, stovetop, valve body, igniter and other components. Currently, there are no truly anti-backfire stoves. Most of them have an anti-backfire plate installed on the burner, or a temperature probe installed at the end of the stove burner. The anti-backfire plate has no anti-backfire effect, and the temperature probe at the end of the burner needs to be connected to a controller to control the gas circuit, resulting in higher costs.

[0003] Therefore, further improvements are necessary. Utility Model Content

[0004] The purpose of the utility model is to provide an anti-backfire structure and a stove with simple structure, good anti-backfire effect, low cost, simple installation and strong practicality, so as to overcome the shortcomings of the prior art.

[0005] An anti-backfire structure designed for this purpose includes a burner head assembly, an air intake pipe and a solenoid valve. The air intake pipe is connected to the burner head assembly, and the solenoid valve is arranged on the air intake pipe. It is characterized in that a thermocouple and a temperature detection component are provided on the burner head assembly, and the solenoid valve is electrically connected to the thermocouple and the temperature detection component respectively. The thermocouple and the solenoid valve form a main circuit, and the temperature detection component and the solenoid valve form a secondary circuit.

[0006] The temperature detection component is made of alloy material.

[0007] One end of the solenoid valve is provided with a wiring terminal, the thermocouple is connected to the wiring terminal through a thermocouple main line, and the wiring terminal is connected to a temperature detection component through a thermocouple secondary line.

[0008] The burner head assembly includes a burner head and an ejector tube. One end of the ejector tube is connected to the air intake pipeline and the other end is connected to the burner head. The thermocouple is arranged on the burner head and the temperature detection component is arranged on the ejector tube.

[0009] The temperature detection component is a temperature probe.

[0010] When more than one temperature detection component is provided, two or more temperature detection components are provided in series.

[0011] The terminal head is provided with a main line connection part and a secondary line connection part. The main line connection part is connected to the thermocouple main line, and the secondary line connection part is connected to the thermocouple secondary line.

[0012] The temperature detection component is fixed on the outer side or the outer top of the ejector tube.

[0013] The temperature detecting component is in contact with the outer wall of the ejector tube.

[0014] A stove designed for this purpose includes a stove base and the anti-backfire structure, with a burner assembly and an air intake pipe installed in the stove base.

[0015] The anti-backfire structure of the present invention is achieved by arranging a thermocouple and a temperature detection component on the burner assembly. The thermocouple and the solenoid valve form a main circuit, and the temperature detection component and the solenoid valve form a secondary circuit. A thermocouple double-wire structure is adopted. The main circuit controls the normal on and off of the solenoid valve, and the secondary circuit controls the anti-backfire. The secondary circuit is connected to a temperature probe (alloy material), and the temperature probe is fixed on the burner ejector pipe. When the stove is about to backfire, the internal temperature of the ejector pipe will suddenly rise, and the alloy temperature probe will generate a reverse thermoelectric potential greater than the main circuit, thereby closing the solenoid valve, thereby achieving the purpose of cutting off the gas source, thus realizing the anti-backfire of the stove in a true sense. Moreover, the temperature probe does not need to be connected to a controller to control the on and off of the gas circuit, so the cost is relatively low. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of a stove in one embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram of the overall structure of the stove in another aspect of an embodiment of the present invention.

[0018] Figure 3 for Figure 2 Schematic diagram of the enlarged structure at point A in the middle. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] See also Figure 1-Figure 3 The anti-backfire structure includes a burner head assembly 1, an air intake pipe 2 and a solenoid valve 3. The air intake pipe 2 is connected to the burner head assembly 1, the solenoid valve 3 is arranged on the air intake pipe 2, and a thermocouple 4 and a temperature detection component 5 are provided on the burner head assembly. The solenoid valve 3 is electrically connected to the thermocouple 4 and the temperature detection component 5 respectively. The thermocouple 4 and the solenoid valve 3 form a main circuit, and the temperature detection component 5 and the solenoid valve 3 form a secondary circuit.

[0021] The temperature detection component 5 is made of an alloy material and is a temperature probe. When the cooker is about to temper, the temperature inside the ejector tube 10 will suddenly rise, and the alloy temperature probe will generate a reverse thermoelectric potential greater than the main circuit, thereby closing the solenoid valve 3. The thermoelectric potential generated by different alloy materials under the action of temperature. When the two ends of two conductors of different compositions are connected to form a circuit, when the temperatures at the junction are different, an electromotive force will be generated in the circuit. This phenomenon is called the thermoelectric effect, and this electromotive force is called the thermoelectric potential. When the temperature inside the ejector tube 10 is lower than a certain temperature, the reverse thermoelectric potential disappears, the solenoid valve 3 reopens, and the cooker can continue to be used.

[0022] One end of the solenoid valve 3 is provided with a wiring terminal 6 , the thermocouple 4 is connected to the wiring terminal 6 via a thermocouple main line 7 , and the wiring terminal 6 is connected to the temperature detection component 5 via a thermocouple secondary line 8 .

[0023] The burner head assembly 1 includes a burner head 9 and an ejector tube 10. One end of the ejector tube 10 is connected to the air intake pipe 2 and the other end is connected to the burner head 9. The thermocouple 4 is arranged on the burner head 9, and the temperature detection component 5 is arranged on the ejector tube 10; the thermocouple 4 is used to detect the temperature of the burner head 9 and control the on and off of the gas by sensing temperature changes to ensure safe use.

[0024] When more than one temperature detection component 5 is provided, and when more than two temperature detection components 5 are provided, they are provided in series; when one temperature detection component 5 is provided, the cost is lower, and when more than two temperature detection components 5 are provided, the temperature measurement will not be affected when one of the temperature detection components 5 fails. In this embodiment, only one temperature detection component 5 is provided.

[0025] The terminal head 6 is provided with a main line connection part 11 and a secondary line connection part 12. The main line connection part 11 is connected to the thermocouple main line 7, and the secondary line connection part 12 is connected to the thermocouple secondary line 8. The main line connection part 11 and the secondary line connection part 12 are connection holes, and connection terminals are provided in the connection holes.

[0026] The temperature detecting component 5 is fixed to the outer side or outer top of the ejector tube 10 . In this embodiment, the temperature detecting component 5 is fixed to the outer side of the ejector tube 10 .

[0027] The temperature detecting component 5 is in contact with the outer wall of the ejector tube 10 , and is used to detect the internal temperature of the ejector tube 10 .

[0028] The stove comprises a stove base 13 and the anti-backfire structure. The burner head assembly 1 and the air intake pipe 2 are installed in the stove base 13 .

[0029] The above is a preferred embodiment of the present invention, which illustrates and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A backfire prevention structure, comprising a burner head assembly (1), an air intake pipe (2) and a solenoid valve (3), wherein the air intake pipe (2) is connected to the burner head assembly (1), and the solenoid valve (3) is arranged on the air intake pipe (2), characterized in that: A thermocouple (4) and a temperature detection component (5) are provided on the furnace head assembly, and the solenoid valve (3) is electrically connected to the thermocouple (4) and the temperature detection component (5), respectively. The thermocouple (4) and the solenoid valve (3) form a main circuit, and the temperature detection component (5) and the solenoid valve (3) form a secondary circuit.

2. The anti-backfire structure according to claim 1, characterized in that: The temperature detection component (5) is made of alloy material.

3. The anti-backfire structure according to claim 2, characterized in that: One end of the solenoid valve (3) is provided with a wiring terminal (6), the thermocouple (4) is connected to the wiring terminal (6) via a thermocouple main line (7), and the wiring terminal (6) is connected to the temperature detection component (5) via a thermocouple secondary line (8).

4. The anti-backfire structure according to claim 3, characterized in that: The burner head assembly (1) comprises a burner head (9) and an ejector tube (10), one end of the ejector tube (10) is connected to the air inlet pipeline (2) and the other end is connected to the burner head (9), a thermocouple (4) is arranged on the burner head (9), and a temperature detection component (5) is arranged on the ejector tube (10).

5. The anti-backfire structure according to claim 4, characterized in that: The temperature detection component (5) is a temperature probe.

6. The anti-backfire structure according to claim 5, characterized in that: When more than one temperature detection component (5) is provided, the temperature detection components (5) are provided in series. When more than two temperature detection components (5) are provided, the temperature detection components (5) are provided in series.

7. The anti-backfire structure according to claim 3, characterized in that: The connection terminal (6) is provided with a main line connection portion (11) and a secondary line connection portion (12), the main line connection portion (11) is connected to the thermocouple main line (7), and the secondary line connection portion (12) is connected to the thermocouple secondary line (8).

8. The anti-backfire structure according to claim 4, characterized in that: The temperature detection component (5) is fixed to the outer side or outer top of the ejector tube (10).

9. The anti-backfire structure according to claim 8, characterized in that: The temperature detection component (5) contacts the outer wall of the ejector tube (10).

10. A stove, comprising a stove base (13), characterized in that: It also includes the anti-backfire structure according to any one of claims 1 to 9, and the burner head assembly (1) and the air inlet pipe (2) are installed in the burner base (13).

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