Gas flameout protection device

Abstract

The utility model discloses a gas flameout protection device which comprises an electromagnetic valve, the electromagnetic valve comprises a shell, a sealing gasket, a connecting shaft, an electromagnetic sheet and an electromagnet, and the electromagnetic sheet and the electromagnet are installed in the shell. The upper end of the connecting shaft is connected with the sealing gasket, and the lower end of the connecting shaft is connected with the electromagnetic sheet; the electromagnetic sheet and the electromagnet can be attracted; the lower end of the shell is connected with a valve seat, the valve seat is an integrated non-metal valve seat, and the electromagnet is connected with the upper end of the valve seat in a clamped mode. The valve seat is further provided with an outer connecting part used for being connected with a valve body of the gas valve. A coil is wound on the electromagnet, and a ground wire pin and a main wire pin of the coil extend outwards and are connected into the two connecting pins respectively. According to the utility model, the cost can be greatly reduced, the assembly efficiency of the thermocouple and the electromagnetic valve can be improved, the assembly reliability between the electromagnet and the valve seat in the electromagnetic valve can be improved, and the generation of metal scraps can be avoided.

Description

Technical Field

[0001] This utility model relates to a gas flameout protection device. Background Technology

[0002] Currently, the mainstream gas flameout protection devices for stoves on the market mainly consist of a solenoid valve and a thermocouple. The thermocouple primarily comprises a head, connecting wires, and a connector at the tail end. The head is made of a special material that generates an electromotive force in the flame. The solenoid valve mainly consists of a copper shaft, valve seat, coil, electromagnet, electromagnetic plate, bracket, pin, spring, and sealing gasket. When current is applied to the coil, which is fitted onto the electromagnet, a magnetic field is generated, attracting the electromagnetic plate. The sealing gasket on the copper shaft keeps the gas passage open. When the current disappears, the sealing gasket returns to its original position under the action of the spring, thus closing the gas passage. After the thermocouple is connected to the solenoid valve, the thermocouple head generates current in the flame, supplying the solenoid valve to open, thus opening the gas passage; after an accidental flameout, the current disappears, the solenoid valve closes, and the gas passage is shut off.

[0003] In existing solenoid valve structures, the coil is mounted on an electromagnet, with one end pin welded to a pin that connects to the main signal line of the thermocouple. The other end pin is resistance-welded to the base, forming a ground after the solenoid valve is installed. Simultaneously, the thermocouple's grounding wire is connected to the solenoid valve's bracket via screws, thus forming a complete current loop. This structure has several drawbacks. First, because the coil pin and base are welded, both the base and bracket must be made of conductive metal. The base is typically machined from brass, while the bracket is usually stamped from galvanized steel, resulting in high costs. Furthermore, the base, being a metal component, is usually riveted to the center of the electromagnet in existing technologies. During use, friction can easily occur between the base and the electromagnet, generating metal debris that interferes with the solenoid valve's normal electromagnetic characteristics and causes wear on the electromagnet or its plates, affecting its lifespan. Second, the connection between the thermocouple and the solenoid valve requires not only the main signal line connection but also a grounding connection via screws, increasing assembly efficiency and costs for the manufacturer. Utility Model Content

[0004] To solve the above-mentioned technical problems, the purpose of this utility model is to provide a gas flameout protection device that can significantly reduce costs, improve the assembly efficiency of thermocouples and solenoid valves, and improve the assembly reliability between the electromagnet and the valve seat in the solenoid valve, thus avoiding the generation of metal debris.

[0005] To achieve the above-mentioned technical objectives and effects, this utility model is implemented through the following technical solution:

[0006] A gas flameout protection device includes a solenoid valve, which comprises a housing, a sealing gasket, a connecting shaft, and an electromagnetic plate and an electromagnet mounted in the housing; the upper end of the connecting shaft is connected to the sealing gasket, and its lower end is connected to the electromagnetic plate; the electromagnetic plate and the electromagnet are capable of engaging; a valve seat is connected to the lower end of the housing, the valve seat being an integral non-metallic valve seat, and the electromagnet is engaged with the upper end of the valve seat; the valve seat also has an external connecting portion for connecting to the valve body of a gas valve;

[0007] A coil is wound around the electromagnet, with the ground pin and main pin of the coil extending outward and connected to two connecting pins respectively.

[0008] As a further improvement to the above-mentioned technical solution of this utility model, the sealing gasket is located above the outer shell, and a spring fitted on the connecting shaft is also provided between the sealing gasket and the upper end of the outer shell.

[0009] As a further improvement to the above-mentioned technical solution of this utility model, the valve seat is a hollow structure, and the lower end of the electromagnet has a boss, which is engaged in the hollow structure of the valve seat.

[0010] As a further improvement to the above-mentioned technical solution of this utility model, a snap hook is provided on the upper end face of the valve seat, an inner flange is provided on the inner wall of the hollow structure of the valve seat, the boss of the electromagnet abuts against the inner flange of the valve seat, and the snap hook of the valve seat abuts against the upper end face of the boss of the electromagnet seat.

[0011] As a further improvement to the above-mentioned technical solution of this utility model, the upper end face of the snap hook is inclined near the hollow structure to facilitate the insertion of the electromagnet.

[0012] As a further improvement to the above-mentioned technical solution of this utility model, the upper outer circumference of the valve seat is provided with a first outer flange and a second outer flange, and the lower inner wall of the outer shell is provided with a snap-fit ​​protrusion, which is adapted to the recess formed between the first outer flange and the second outer flange of the valve seat.

[0013] As a further improvement to the above-mentioned technical solution of this utility model, the outer connecting part of the valve seat extends outward horizontally, and a fixing hole is provided on it for connection with the valve body of the gas valve.

[0014] As a further improvement to the above-mentioned technical solution of this utility model, the valve seat is a plastic valve seat.

[0015] As a further improvement to the above-mentioned technical solution of this utility model, the gas flameout protection device also includes a thermocouple. The thermocouple includes a connector, a main signal line and a grounding line. The connector has two insertion holes that are adapted to the two connecting pins. The two connecting pins of the solenoid valve are respectively inserted into the insertion holes and connected to the terminals of the main signal line and the grounding line, respectively.

[0016] As a further improvement to the above-mentioned technical solution of this utility model, the grounding wire is welded to the head of the thermocouple.

[0017] The beneficial effects of this utility model are:

[0018] The valve seat in this utility model is an integrated non-metallic valve seat, which integrates the base and bracket in the prior art. It can be made of plastic material and injection molding process, which can greatly reduce the cost.

[0019] In this invention, the valve seat and the electromagnet are engaged. Specifically, a hook is provided on the upper surface of the valve seat, and an inner flange is provided on the inner wall of the hollow structure of the valve seat. The boss of the electromagnet abuts against the inner flange of the valve seat, and the hook of the valve seat abuts against the upper surface of the boss of the electromagnet. Compared with the riveting structure in the prior art, this engagement structure of the electromagnet and the valve seat has better structural reliability, is less prone to shaking, and greatly reduces friction between the electromagnet and the valve seat, avoiding the generation of metal debris, thereby ensuring the normal electromagnetic characteristics and service life of the solenoid valve.

[0020] This invention adopts a single-coil, double-pin structure, with both ends of the coil welded to two connecting pins respectively, eliminating the need for resistance welding between one end of the coil and the valve seat in the prior art. Since the coil does not need to be welded to the valve seat, the non-metallic valve seat can be adapted to the single coil. At the same time, due to the double-pin structure, the thermocouple also adopts a double-terminal plug-in structure, thus eliminating the need to use a grounding screw to form a circuit, eliminating the need for assembly and screwing processes at the OEM, allowing for connection with a single insertion, reducing costs and improving efficiency. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of the solenoid valve in the gas flameout protection device of this utility model.

[0022] Figure 2 This is a cross-sectional view of the solenoid valve in the gas flameout protection device of this utility model from another direction.

[0023] Figure 3 This is a schematic diagram of the thermocouple structure in the gas flameout protection device of this utility model.

[0024] Figure 4 This is a schematic diagram of the valve seat in the gas flameout protection device of this utility model.

[0025] In the diagram, 1: Solenoid valve, 11: Housing, 111: Snap-fit ​​protrusion, 12: Sealing gasket, 13: Connecting shaft, 14: Electromagnetic plate, 15: Electromagnet, 151: Boss, 16: Spring, 17: Gasket, 18: Coil, 181: Ground pin, 182: Main pin, 19: Valve seat, 190: Bayonet, 191: First outer flange, 192: Second outer flange, 193: Snap-fit ​​hook, 194: Inner flange, 195: Outer connecting part, 196: Fixing hole, 197: Connecting pin, 198: Upper seal, 199: Plastic part; 2: Thermocouple, 21: Connector, 211: Snap-fit ​​arm, 212: Plug hole, 22: Main signal line, 23: Grounding wire. Detailed Implementation

[0026] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0027] like Figures 1 to 4 As shown, a gas flameout protection device includes a solenoid valve 1 and a thermocouple 2; the solenoid valve 1 includes a housing 11, a sealing gasket 12, a connecting shaft 13, an electromagnetic plate 14, and an electromagnet 15; the thermocouple 2 includes a connector 21, a main signal line 22, and a grounding wire 23.

[0028] In the solenoid valve, the outer shell 11 is a hollow structure with its upper end tapering to form a stepped structure. The electromagnetic plate 14 and the electromagnet 15 are located within the hollow structure of the outer shell 11. The connecting shaft 13 passes through the upper end of the outer shell 11, with its upper end connected to the sealing gasket 12 and its lower end connected to the electromagnetic plate 14. A spring 16 is also installed between the upper end of the outer shell 11 and the sealing gasket 12, sleeved on the connecting shaft 13. Under the action of the spring 16, the electromagnetic plate 14 can be reset. A gasket 17 is also provided between the sealing gasket 12 and the spring 16, sleeved on the connecting shaft 13.

[0029] The electromagnet 15 includes two iron core columns, and a coil 18 is evenly wound on the two iron core columns of the electromagnet 15. The ground pin 181 and the main pin 182 of the coil 18 are led outward from the middle of the connection between the two iron core columns.

[0030] The lower end of the outer casing 11 is connected to a valve seat 19. Specifically, the upper outer circumference of the valve seat 19 is provided with a first outer flange 191 and a second outer flange 192, and the lower inner wall of the outer casing 11 is provided with a snap-fit ​​protrusion 111. The snap-fit ​​protrusion 111 is adapted to the notch formed between the first outer flange 191 and the second outer flange 192 of the valve seat 19 to connect the valve seat 19 to the lower end of the outer casing 11.

[0031] like Figure 4 As shown, the valve seat 19 is an integral non-metallic valve seat, preferably a plastic valve seat, which is made of plastic material and injection molding process, and the valve seat has a hollow structure; the electromagnet 15 is snapped onto the upper part of the valve seat 19; specifically, the lower end of the electromagnet 15 has an outwardly extending boss 151, the upper end surface of the valve seat 19 is provided with a snap hook 193, the inner wall of the hollow structure of the valve seat 19 is provided with an inner flange 194, the boss 151 of the electromagnet 15 abuts against the inner flange 194 of the valve seat 19, and the snap hook 193 of the valve seat 19 abuts against the upper end surface of the boss 151 of the electromagnet 15, thus realizing the snap-fit ​​between the electromagnet 15 and the valve seat 19.

[0032] In addition, the upper end face of the snap hook 193 is beveled near the hollow structure of the valve seat to facilitate the insertion of the electromagnet.

[0033] Compared to the riveting structure in the prior art, the snap-fit ​​structure of this invention between the electromagnet and the valve seat has better structural reliability. The electromagnet is less likely to wobble on the valve seat, and the friction between the electromagnet and the valve seat can be greatly reduced, avoiding the generation of metal debris, thereby ensuring the normal electromagnetic characteristics and service life of the solenoid valve.

[0034] The valve seat 19 also has an external connecting portion 195 for connecting to the valve body of the gas valve. The external connecting portion 195 extends horizontally outward and has a fixing hole 196 for connecting to the valve body of the gas valve. The integrated non-metallic valve seat of this utility model integrates the base and bracket in the prior art. It can be made of plastic material and injection molding process, which can greatly reduce the cost.

[0035] Two connecting pins 197, an upper seal 198, and a plastic part 199 are assembled in the lower part of the valve seat 19. The upper seal 198 and the plastic part 199 mate with the lower part of the valve seat 19. The two connecting pins 197 pass through the central holes of the upper seal 198 and the plastic part 199, respectively, and extend outward from the valve seat 19. The ground pin 181 and the main pin 182 of the coil 18 are respectively inserted into the central holes of the two connecting pins 197 and soldered to the connecting pins 197.

[0036] Regarding the specific structure of a thermocouple, such as Figure 3As shown, thermocouple 2 includes a connector 21 and a main signal line 22 and a grounding line 23 connected to the connector 21. Thermocouple 2 is connected to the lower part of valve seat 19 via connector 21; specifically, the end of connector 21 has a snap-fit ​​arm 211, and the outer side of valve seat 19 has a bayonet 190 adapted to snap-fit ​​arm 211. Snap-fit ​​arm 211 engages with bayonet 190 to achieve docking between connector 21 and valve seat 19. Connector 21 has two insertion holes 212 adapted to the two connecting pins 197. The two connecting pins 197 of solenoid valve 1 are respectively inserted into insertion holes 212 and connected to the terminals of main signal line 22 and grounding line 23, respectively; grounding line 22 is welded to the head of thermocouple. The thermocouple head includes a housing and a thin rod located within the housing.

[0037] This invention adopts a single-coil, double-pin structure, with both ends of the coil welded to two connecting pins respectively, eliminating the need for resistance welding between one end of the coil and the valve seat in the prior art. Since the coil does not need to be welded to the valve seat, the non-metallic valve seat can be adapted to the single coil. At the same time, due to the double-pin structure, the thermocouple also adopts a double-terminal plug-in structure, thus eliminating the need to use a grounding screw to form a circuit, eliminating the need for assembly and screwing processes at the OEM, allowing for connection with a single insertion, reducing costs and improving efficiency.

[0038] This gas flameout protection device is used in conjunction with a gas valve. The outer connection of the valve seat is fixedly connected to the valve body of the gas valve via a fastener. A sealing ring is also installed between the valve seat and the valve body of the gas valve to ensure a tight seal. The working principle of this gas flameout protection device is as follows:

[0039] During normal combustion in the stove, the thermocouple head senses the flame and generates a thermoelectric potential. This thermoelectric potential is transmitted to the coil 18 of the solenoid valve 1 through the main signal line 22, forming a current loop and generating a magnetic field. This keeps the electromagnet 15 and the electromagnet plate 14 in an attracted state, and the sealing gasket 12 keeps the gas passage of the gas valve body open, maintaining the gas passage and ensuring normal combustion of the burner. When the flame is extinguished due to an accident, the thermocouple 2 loses its heat source, its temperature gradually decreases, and the thermoelectric potential weakens and eventually disappears. At this time, the current generated by the thermocouple 2 disappears, the coil of the solenoid valve 1 loses power, and the magnetic field disappears. Under the action of the spring 16, the electromagnet plate 14 quickly returns to its original position, and the sealing gasket 12 seals the gas passage, cutting off the gas supply and preventing gas leakage.

[0040] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0041] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A gas flame failure safeguard device characterised in that, The electromagnetic valve comprises a housing, a sealing gasket, a connecting shaft, and an electromagnetic sheet and an electromagnet installed in the housing; the upper end of the connecting shaft is connected with the sealing gasket, and the lower end is connected with the electromagnetic sheet; the electromagnetic sheet and the electromagnet can be attracted; the lower end of the housing is connected with a valve seat which is an integrated non-metal valve seat; the electromagnet is clamped with the upper end of the valve seat; the valve seat further has an outer connecting part for connecting with the valve body of a gas valve; A coil is wound on the electromagnet, and the ground pin and the main wire pin of the coil extend outward and are connected with two connecting pins respectively.

2. A gas flame failure protection device according to claim 1, characterised in that The sealing gasket is located above the housing, and a spring is further arranged on the connecting shaft between the sealing gasket and the upper end of the housing.

3. A gas flame failure device according to claim 1, wherein The valve seat is a hollow structure, the lower end of the electromagnet has a boss, and the boss of the electromagnet is clamped in the hollow structure of the valve seat.

4. A gas flame failure protection device according to claim 3, characterised in that The upper end surface of the valve seat is provided with a clamping hook, the inner wall of the hollow structure of the valve seat is provided with an inner flange, the boss of the electromagnet abuts on the inner flange of the valve seat, and the clamping hook of the valve seat abuts on the upper end surface of the boss of the electromagnet.

5. A gas flame failure protection device according to claim 4, characterised in that The upper end surface of the clamping hook is beveled near the hollow structure.

6. A gas flame failure device according to claim 1, wherein The upper end of the valve seat is provided with a first outer flange and a second outer flange, the lower end of the housing is provided with a clamping protrusion on the inner wall, and the clamping protrusion is matched with the notch formed between the first outer flange and the second outer flange of the valve seat.

7. A gas flame failure device according to claim 1, wherein The outer connecting part of the valve seat extends outward horizontally, and is provided with a fixing hole for connecting with the valve body of a gas valve.

8. A gas flame failure device according to claim 1, wherein The valve seat is a plastic valve seat.

9. A gas flame failure device according to claim 1, wherein The thermocouple comprises a plug connector, a main signal line and a ground wire, the plug connector has two plug holes matched with the two connecting pins, and the two connecting pins of the electromagnetic valve are respectively inserted into the plug holes and connected with the terminals of the main signal line and the ground wire.

10. A gas flame failure device according to claim 9, wherein The ground wire is welded with the head of the thermocouple.

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