Gas flame failure device

Abstract

The utility model discloses an easy dismounting's gas flameout protection device, including thermocouple, solenoid valve, guide sleeve, annular terminal and support frame, thermocouple is equipped with metal insert, solenoid valve is equipped with pin, and pin and metal insert plug in, guide sleeve is fixed at metal insert, annular terminal is equipped with cavity, and guide sleeve is fixed in the cavity, support frame is equipped with the fixed hole that passes through up and down, solenoid valve is equipped with valve seat, and valve seat stretches into fixed hole, and with support frame fixed, guide sleeve is equipped with the elastic limiting portion, and guide sleeve stretches into fixed hole along the axis direction of solenoid valve, and the limiting portion of deformation clamps tightly at the inner wall of fixed hole, annular terminal and guide sleeve form gap one, and the end of support frame stretches into gap one along the axis direction of solenoid valve, and clamps tightly in gap one, can guarantee the reliability of long -term connection of pin and metal insert.

Description

Technical Field

[0001] This utility model belongs to the field of gas appliance technology, specifically relating to an easily detachable gas flameout protection device. Background Technology

[0002] In gas combustion equipment, flameout protection is a crucial safety feature. Current technology commonly uses connectors to electrically connect thermocouples to gas safety valves (especially solenoid valves). The working principle is as follows: when the burner is operating normally, the thermocouple is heated to generate a thermoelectric potential, keeping the solenoid valve open and allowing gas to pass through. If the burner unexpectedly shuts off, the thermocouple gradually cools, the generated thermoelectric potential disappears, causing the solenoid valve to be de-energized, thus quickly closing the gas passage and preventing gas leakage.

[0003] In existing technologies, a common method for achieving electrical connection between a solenoid valve and a thermocouple is through a pin-and-plug connection structure. Specifically, Chinese patent document (authorization announcement number: CN 203115249 U) discloses a utility model patent entitled "Connection Device between Gas Flameout Protection Solenoid Valve and Thermocouple". In this device, the thermocouple connection plug includes an external large plug, an insulating guide sleeve disposed within the large plug, and a metal plug disposed within the insulating guide sleeve. The metal plug is typically a metal cylinder with an inner diameter slightly smaller than the outer diameter of the solenoid valve pin, achieving a stable and reliable electrical connection through an interference fit. The solenoid valve pin is inserted into this metal plug, ensuring continuous electrical contact.

[0004] While existing technologies have solved the problem of reliable electrical connection points through the interference fit between metal inserts and pins, they lack optimized design for how the guide sleeve connects to the solenoid valve. This can lead to the metal inserts and pins loosening during long-term use or when subjected to vibration, affecting the overall stability. Utility Model Content

[0005] The purpose of this utility model is to solve the above-mentioned technical problems existing in the prior art, and to provide an easy-to-disassemble gas flameout protection device that ensures the reliability of long-term connection between the pin and the metal plug.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] An easily detachable gas flameout protection device includes a thermocouple, a solenoid valve, a guide sleeve, and an annular terminal. The thermocouple has a metal insert, the solenoid valve has a pin, the pin and the metal insert are inserted into each other, the guide sleeve is fixed at the metal insert, and the annular terminal has a cavity in which the guide sleeve is fixed. The device is characterized by further including a support frame with a through-hole, a valve seat extending into the hole and fixed to the support frame, and a flexible limiting part extending into the hole along the axis of the solenoid valve. The deformable limiting part is engaged with the inner wall of the hole. A gap is formed between the annular terminal and the guide sleeve, and the end of the support frame extends into the gap along the axis of the solenoid valve and is engaged within the gap.

[0008] Furthermore, the support frame includes a support part one, a support part two, and a connecting part. The connecting part is connected between the support part one and the support part two. The cross-section of the support part one is annular, the cross-section of the support part two is annular, the inner diameter of the support part one is larger than the inner diameter of the support part two, and the inner diameter of the connecting part gradually decreases from the support part one to the support part two. The limiting part is locked at the inner wall of the connecting part.

[0009] Furthermore, the support part one, support part two, and connecting part are integrally formed structures.

[0010] Furthermore, the guide sleeve and the limiting part are provided with at least two vertical slots to form at least two insertion parts. When the limiting part is squeezed, the insertion parts bend and deform in the direction of the axis of the solenoid valve.

[0011] Furthermore, the support frame also includes a fixing part, which is fixed to one part of the support and to the stove.

[0012] Furthermore, the fixing part and the supporting part are integrally formed into a single structure.

[0013] Furthermore, the annular terminal is provided with a vertical slot two. When the end of the support frame extends into the gap one, the annular terminal deforms outward.

[0014] Furthermore, the annular terminal and the guide sleeve form a second gap, which is connected to the first gap.

[0015] Furthermore, the guide sleeve has a cutout located in gap two.

[0016] Furthermore, the guide sleeve is made of plastic.

[0017] This utility model, by adopting the above-mentioned technical solution, has the following beneficial effects:

[0018] This invention utilizes the gap between the annular terminal and the guide sleeve, where the end of the support frame is inserted, forming a stable multi-point mechanical locking structure with the limiting part of the guide sleeve. This constructs an independent mechanical load-bearing system, which independently bears all mechanical loads and stresses from the outside, such as vibration and tension. It provides a rigid protective structure for the internal electrical connection points, ensuring that the electrical connection of the pins and metal plugs is always in a low-stress, highly stable working environment, thereby guaranteeing the reliability of its long-term connection.

[0019] Moreover, the mechanical load-bearing system and the electrical connection structure are separated. The fixing and disassembly of the mechanical parts are completed through the independent path of the elastic limiting part of the guide sleeve engaging or disengaging with the fixing hole of the support frame. The disassembly operation only acts on the external mechanical snap-fit ​​structure, ensuring that the functional integrity of the electrical connection part can still be maintained after multiple disassemblies and reassemblies, avoiding disturbance and damage to the electrical connection of the internal pins and metal plugs. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings:

[0021] Figure 1 This is a schematic diagram of the easily detachable gas flameout protection device of this utility model.

[0022] Figure 2 This is a schematic diagram of the support frame in this utility model;

[0023] Figure 3 for Figure 2 Top view;

[0024] Figure 4 for Figure 3 Sectional view along the middle AA direction;

[0025] Figure 5 This is a schematic diagram of the structure for fixing the solenoid valve and the support frame in this utility model;

[0026] Figure 6 This is a schematic diagram of the structure for fixing the annular terminal and the guide sleeve in this utility model;

[0027] Figure 7 for Figure 6 Top view;

[0028] Figure 8 for Figure 7 Sectional view along the BB direction;

[0029] In the diagram, 1-thermocouple; 11-metal insert;

[0030] 2-Solenoid valve; 21-Valve seat; 22-Pin;

[0031] 3-Support frame; 31-Fixing hole; 32-Support part one; 33-Connecting part; 33a-Guide surface; 34-Support part two; 35-Fixing part;

[0032] 4-Guide sleeve; 41-Limiting part; 42-Slot one; 43-Slit;

[0033] 5-Ring terminal; 51-Slot 2;

[0034] a - Gap 1; b - Gap 2. Detailed Implementation

[0035] like Figures 1 to 8 As shown, this utility model presents an easily detachable gas flameout protection device, comprising a thermocouple 1, a solenoid valve 2, a guide sleeve 4, an annular terminal 5, and a support frame 3. These components together constitute two relatively independent yet collaborative systems: one is an electrical connection system composed of the pin 22 of the solenoid valve 2 and the metal insert 11 of the thermocouple 1, responsible for stable signal transmission; the other is a mechanical fixing and bearing system composed of the support frame 3, the guide sleeve 4, and the annular terminal 5, responsible for structural stability and convenient assembly / disassembly.

[0036] 1. Electrical connection system

[0037] The thermocouple 1 has a metal insert 11 at its end, which is usually a metal cylinder with good electrical conductivity.

[0038] The solenoid valve 2 is equipped with a pin 22, and a protrusion is provided on the inner wall of the metal insert 11. This increases the friction between the pin 22 and the metal insert 11 when the pin 22 is inserted into the metal insert 11, locking the pin 22 and making it difficult to pull out of the metal insert 11. This makes the connection between the solenoid valve 2 and the thermocouple 1 more reliable and stable. This electrical connection system is prior art, specifically referring to the utility model patent for the connection device between the gas flameout protection solenoid valve and the thermocouple (authorization announcement number: CN 203115249 U).

[0039] 2. Mechanical fixing and load-bearing system

[0040] This system is key to achieving the goals of easy disassembly and assembly and high reliability of this invention.

[0041] The guide sleeve 4 of this invention is made of plastic and is integrally molded by injection molding, possessing good insulation and elasticity. The guide sleeve 4 is fixedly fitted onto the outside of the metal insert 11, and an elastic limiting part 41 is provided on the upper part of the guide sleeve 4. To enhance the elastic deformation of the limiting part 41, at least two slots 42 are formed axially on the guide sleeve 4 and the limiting part 41, thereby dividing the limiting part 41 into at least two inwardly elastically bending insertion parts. The guide sleeve 4 also has a boss with a groove for fixing with the annular terminal 5.

[0042] The annular terminal 5 is roughly annular in shape with an internal cavity. The guide sleeve 4 is fixed in the cavity, making them a pre-assembled connector assembly. A gap a is formed between the inner wall of the annular terminal 5 and the outer wall of the guide sleeve 4. One or more vertical slots 51 can be formed on the annular terminal 5. Another gap b can also be formed between the annular terminal 5 and the guide sleeve 4. Gap b is connected to gap a.

[0043] Two symmetrical vertical cuts 43 are provided on the guide sleeve 4, and the cuts 43 are located in the gap 2b, so that the annular terminal 5 can be smoothly and without jamming assembled into the preset position, thereby indirectly ensuring the assembly accuracy and connection reliability of the two.

[0044] The support frame 3 is the core innovative component of this utility model. It has a robust structure and includes an integrally formed fixing part 35, a first support part 32, a second support part 34, and a connecting part 33. The first support part 32, the second support part 34, and the connecting part 33 together form a through fixing hole 31.

[0045] The solenoid valve 2 is equipped with a valve seat 21, which extends from above into the fixing hole 31 and is fixed to the support part 32. The fixing part 35 is used to fix the entire support frame 3 to the mounting panel of the stove with screws or other fasteners, and is the installation base of the entire device. When the support part 34 of the support frame 3 extends axially into the gap 1a between the annular terminal 5 and the guide sleeve 4, it will exert a radial compression force on the annular terminal 5. The slot 2 51 divides the side wall of the annular terminal 5 into one or more elastic parts. When these elastic parts are compressed, they can undergo slight and controllable elastic deformation outward, thereby locking the support part 34 in the gap 1a.

[0046] The cross-sections of support part 1 32 and support part 2 34 are concentric rings, and the inner diameter of support part 1 32 is larger than that of support part 2 34. Connecting part 33 connects support part 1 32 and support part 2 34, and its inner diameter gradually decreases from support part 1 32 to support part 2 34. The inner wall of connecting part 33 forms a conical guide surface 33a. When the guide sleeve 4 is inserted along the axis, the limiting part 41 is in close contact with the inner wall of support part 2 34. The support frame 3 can automatically guide and correct the position of the guide sleeve 4. When the guide sleeve 4 is continuously inserted, the guide surface 33a applies a radially inward and gradually increasing converging compressive force to the limiting part 41, forcing the insertion part separated by slot 1 42 to undergo elastic bending deformation smoothly and synchronously in the direction of the central axis, ensuring that the limiting part 41 can accurately reach and be locked in the predetermined position of the inner wall of connecting part 33, while ensuring the precise alignment of the internal pin 22 and the metal plug 11. This gradual radial compression ensures that the deformation of the limiting part 41 is controllable and uniform, reducing the instantaneous insertion force, avoiding jamming and component damage, and guaranteeing the alignment of the entire connector assembly during insertion. This allows the connector assembly to be firmly fixed and effectively resist vibration and pulling. During disassembly, an axial tensile force is applied to bring the limiting part 41 back into contact with the converging tapered guide surface 33a. At this time, the guide surface 33a also guides the limiting part 31 to contract inward, reducing its outer diameter, thereby allowing it to smoothly exit from the fixing hole 31.

[0047] This invention constructs an independent mechanical load-bearing path: external mechanical loads (vibration, tension) are transmitted to the support frame 3 through the guide sleeve 4, and the support frame 3 then transmits the force to the stove. The electrical connection system (pin 22 and metal plug 11) is decoupled from this unfavorable mechanical environment, its working stress is significantly reduced, and the long-term connection reliability is fundamentally guaranteed.

[0048] The mechanical fixing and disassembly functions are independently completed by the snap-fit ​​structure of the support frame 3 and the guide sleeve 4. The electrical connection function is separated from the physical path and operation, which makes maintenance operations quick, simple and non-destructive.

[0049] The above are merely specific embodiments of this utility model, but the technical features of this utility model are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on this utility model to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of this utility model.

Claims

1. Easily removable gas flameout protection devices, including: Thermocouple, wherein the thermocouple is provided with a metal insert; A solenoid valve, wherein the solenoid valve is provided with a pin, and the pin is inserted into the metal plug; A guide sleeve, which is fixed to the metal insert; An annular terminal, wherein the annular terminal has a cavity, and the guide sleeve is fixed in the cavity; Its characteristic is that it further includes: The support frame has a through-hole, and the solenoid valve has a valve seat that extends into the through-hole and is fixed to the support frame. The guide sleeve has an elastic limiting part that extends into the through-hole along the axis of the solenoid valve. The limiting part, which deforms, is locked at the inner wall of the through-hole. The annular terminal and the guide sleeve form a gap, and the support frame extends into the gap along the axis of the solenoid valve and is locked in the gap.

2. The easily detachable gas flameout protection device according to claim 1, characterized in that: The support frame includes a first support part, a second support part, and a connecting part. The connecting part is connected between the first support part and the second support part. The first support part has a circular cross-section, and the second support part has a circular cross-section. The inner diameter of the first support part is larger than the inner diameter of the second support part. The inner diameter of the connecting part gradually decreases from the first support part to the second support part. The limiting part is fastened to the inner wall of the connecting part.

3. The easily detachable gas flameout protection device according to claim 2, characterized in that: The first support part, the second support part, and the connecting part are integrally formed.

4. The easily detachable gas flameout protection device according to claim 2, characterized in that: The guide sleeve and the limiting part are provided with at least two vertical slots to form at least two insertion parts. When the limiting part is squeezed, the insertion part bends and deforms in the direction of the axis of the solenoid valve.

5. The easily detachable gas flameout protection device according to claim 2, characterized in that: The support frame also includes a fixing part, which is fixed to one part of the support and the stove.

6. The easily detachable gas flameout protection device according to claim 5, characterized in that: The fixing part and the supporting part are integrally formed structures.

7. The easily detachable gas flameout protection device according to claim 1, characterized in that: The annular terminal has a vertical slot two. When the end of the support frame extends into the gap one, the annular terminal deforms outward.

8. The easily detachable gas flameout protection device according to claim 7, characterized in that: The annular terminal and the guide sleeve form a second gap, which is connected to the first gap.

9. The easily detachable gas flameout protection device according to claim 8, characterized in that: The guide sleeve has a cutout, which is located in the second gap.

10. The easily detachable gas flameout protection device according to claim 1, characterized in that: The guide sleeve is made of plastic.

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