Double coil solenoid valve and thermocouple connection structure for gas appliances with good anti-dropping performance

Abstract

The present invention relates to a double-coil solenoid valve and thermocouple connection structure for a gas appliance with good anti-detachment performance, comprising a solenoid valve connection part, a thermocouple connection part, a thermocouple assembly and a ground terminal. The solenoid valve connection part comprises a connection bracket, a pin assembly and a base. The thermocouple connection part comprises a connection plastic cap and a core wire terminal assembly. The ground terminal is composed of a conductive sleeve and a wire pressing spring. The temperature sensing head element and the temperature sensing shell of the thermocouple assembly are electrically connected to the pin assembly and the wire pressing spring respectively. The conductive sleeve is sleeved on the connection bracket. A clamping arm is provided on the connection plastic cap, and correspondingly, an annular limiting groove is provided on the base. On the one hand, while saving the ground wire installation screw process, it ensures that the thermocouple assembly has good grounding performance; on the other hand, it avoids the problem of multiple thermocouple wires being entangled with each other during batch assembly; on the other hand, it can also avoid the solenoid valve connection part from being disengaged relative to the thermocouple connection part.

Description

Technical Field

[0001] The invention relates to the technical field of gas appliance manufacturing, in particular to a double-coil electromagnetic valve and thermocouple connection structure of a gas appliance with good anti-detachment performance. Background Art

[0002] The gas solenoid valve is a safety emergency shut-off device for the gas pipeline. It can be connected to the gas leak alarm system or to the fire protection and other intelligent alarm control terminal modules, etc., to realize on-site or remote automatic / manual emergency shut-off of the gas source to ensure gas safety. When an accidental flameout or harmful strong vibration occurs, the solenoid valve will automatically close. The gas flameout protection device on the market mainly consists of a thermocouple connection part, a solenoid valve connection part and a thermocouple assembly. The solenoid valve connection part includes a connecting bracket and a pin assembly. The thermocouple assembly can generate a millivolt-level thermoelectric potential in the flame. At the same time, the solenoid valve connection part installed in the valve seat is connected and conducted with the thermocouple connection part. Under the action of the thermoelectric potential, the solenoid valve is kept in the attracted state, and the gas is in the connected state. It is known that the thermocouple assembly includes a temperature sensing head element and a temperature sensing shell, wherein the temperature sensing head element must always be electrically connected to the pin assembly in the solenoid valve connection part, and the temperature sensing shell must always be electrically connected to the connecting bracket, thereby forming a current loop.

[0003] In the prior art, a wire is usually welded on the outer wall of the temperature sensing housing, and a round terminal disposed at the end of the wire is fixed to the valve seat (such as Figure 1 (as shown in ), and when the whole machine factory assembles in batches, multiple thermocouple wires will be entangled, which needs to be straightened out, increasing the difficulty of assembly. In addition, when the operator actually performs the gas appliance installation operation, a large amount of assembly man-hours and material consumption are spent, which increases the difficulty and cost of installation to a certain extent. Recently, our company has developed a new type of gas appliance double-coil solenoid valve and thermocouple connection structure, which realizes direct electrical conduction between the solenoid valve connection part and the thermocouple assembly by adding a ground terminal, so as to form a current loop between the two, ensure that the thermocouple assembly has good grounding, thereby effectively solving the above problems and reducing the difficulty and cost of stove installation. However, in the actual installation process of the gas appliance, the following problems occur: when subjected to external force, the thermocouple connection part is very easy to come out relative to the solenoid valve connection part. In this way, it is inevitable that the pin assembly and the temperature sensing head element are electrically connected and the ground terminal and the solenoid valve connection part are electrically connected. Failure occurs, so that the current loop cannot be formed, which in turn affects the normal use of the gas appliance. Therefore, technical personnel are urgently needed to solve the above problems. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a double-coil solenoid valve and thermocouple connection structure for gas appliances with simple structural design, good conductivity, easy assembly, and good anti-detachment performance to ensure good plug-in reliability between the thermocouple connection part and the solenoid valve connection part.

[0005] In order to solve the above technical problems, the present invention relates to a double-coil solenoid valve and thermocouple connection structure for a gas appliance with good anti-detachment performance, which includes a solenoid valve connection part, a thermocouple connection part, a thermocouple assembly and a ground terminal. The solenoid valve connection part is arranged directly below the thermocouple connection part and is plugged in and connected to each other. The solenoid valve connection part includes a connecting bracket, a pin assembly and a base. The pin assembly is built into the above base and is integrally inserted into the inner cavity of the connecting bracket. The pin assembly includes a main line pin and an auxiliary line pin. The thermocouple connection part includes a connecting plastic cap and a core wire terminal assembly that is compatible with the above pin assembly. The core wire terminal assembly is inserted and fixed in the inner cavity of the connecting plastic cap, and includes a main line terminal that is compatible and plugged with the above main line pin and an auxiliary line terminal that is compatible and plugged with the above auxiliary line pin. The ground terminal is composed of a conductive sleeve and a wire pressing spring formed by the extension of the conductive sleeve. The thermocouple assembly includes a temperature-sensing head element and a temperature-sensing shell sleeved on the periphery of the temperature-sensing head element, wherein the temperature-sensing head element and the temperature-sensing shell are electrically connected to the pin assembly and the wire-pressing spring sheet, respectively. The conductive sleeve is coaxially sleeved with the connecting bracket to realize the grounding function of the temperature-sensing shell. A clamping arm is also provided on the connecting plastic cap. The number of the clamping arms is at least 2, and they are formed by continuing to extend downward from the lower end surface of the connecting plastic cap. A clamping protrusion extends inward from the free end of each of the above-mentioned clamping arms, and correspondingly, an annular limiting groove that is compatible with the clamping protrusion is provided around the outer wall of the base. An avoidance notch that is compatible with the shape of the above-mentioned clamping arm is provided around the connecting bracket, and the number and orientation of the avoidance notch are consistent with the clamping arm.

[0006] As a further improvement of the technical solution of the present invention, a mounting notch is provided on the side wall of the conductive sleeve.

[0007] As a further improvement of the technical solution of the present invention, the ground terminal is clamped between the connecting plastic cap and the connecting bracket, is built into the inner cavity of the connecting bracket, and is sleeved on the connecting plastic cap.

[0008] As a further improvement of the technical solution of the present invention, an annular limiting groove is provided around the outer side wall of the connecting plastic cap for inserting the conductive sleeve, and a limiting flange is additionally formed at its lower end. The conductive sleeve is sleeved in the annular limiting groove and inserted into the inner cavity of the connecting bracket as a whole. The clamping arm is formed by extending downward from the limiting flange.

[0009] As a further improvement of the technical solution of the present invention, a first strip-shaped seam is provided on the above-mentioned connecting plastic cap. The number of the first strip-shaped seams is set to be multiple, and they are evenly distributed circumferentially around the outer side wall of the connecting plastic cap. The limiting flange is penetrated by the first strip-shaped seam to form a plurality of limiting flange segments. The above-mentioned clamping arm is formed by the limiting flange segment extending downward.

[0010] As a further improvement of the technical solution of the present invention, a guiding inclined surface is provided on the above-mentioned clamping protrusion, which is formed by inwardly beveling the lower end surface of the clamping arm.

[0011] As a further improvement of the technical solution of the present invention, the conductive sleeve is in a "waist drum-shaped" structure, and its side wall is formed by countless arc lines extending circumferentially in sequence.

[0012] As a further improvement of the technical solution of the present invention, a second strip-shaped slit is provided on the conductive sleeve. The number of the second strip-shaped slits is set to be multiple and is evenly distributed circumferentially around the outer side wall of the conductive sleeve.

[0013] As a further improvement of the technical solution of the present invention, a guide protrusion extends outward from the outer side wall of the connecting plastic cap, and correspondingly, a strip-shaped guide notch matching the guide protrusion is opened on the side wall of the connecting bracket. The guide protrusion matches the installation notch and passes through the installation notch.

[0014] As a further improvement of the technical solution of the present invention, guide bevels are provided on both sides of the insertion end of the guide protrusion.

[0015] Compared with the connection structure of the double-coil solenoid valve and thermocouple of the traditional gas appliance design, in the technical solution disclosed in the present invention, the pin assembly is connected with the core wire terminal assembly, and the ground wire terminal is connected with the connection bracket, so as to form a complete connection between the main / auxiliary current and the ground wire of the thermocouple and the solenoid valve. On the premise of ensuring the reliable grounding of the thermocouple assembly and the convenience of stove installation, when the solenoid valve connection part and the thermocouple connection part are plugged in, the clamping protrusion is hooked in the annular limit groove, thereby preventing the solenoid valve connection part from being disengaged relative to the thermocouple connection part due to external force, thereby ensuring the reliability and stability of the connection between the two; and on the premise of saving the installation screw process of the ground wire, effectively ensuring the reliability of the grounding of the thermocouple assembly; in addition, it also avoids the entanglement problem between multiple thermocouple wires during batch assembly in the whole machine factory, thus greatly reducing the investment of assembly labor, effectively improving the installation efficiency, and reducing the installation cost of the stove. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 The invention is a structural schematic diagram of a double-coil electromagnetic valve and a thermocouple connection structure of a gas appliance in the prior art.

[0018] Figure 2 The invention is a schematic structural diagram of a double-coil electromagnetic valve and a thermocouple connection structure of a gas burner with good anti-detachment performance.

[0019] Figure 3 The invention is a schematic diagram of an assembly of a solenoid valve connection part, a thermocouple connection part and a ground terminal in a double-coil solenoid valve and a thermocouple connection structure for a gas appliance with good anti-detachment performance.

[0020] Figure 4 The invention discloses an exploded view of an assembly of a solenoid valve connection part, a thermocouple connection part and a ground terminal in a double-coil solenoid valve and a thermocouple connection structure for a gas appliance having good anti-detachment performance.

[0021] Figure 5 yes Figure 3 Rear view of.

[0022] Figure 6 yes Figure 5 AA section view.

[0023] Figure 7 yes Figure 5 BB cross-sectional view.

[0024] Figure 8 yes Figure 3 Front view of .

[0025] Fig. 9 yes Figure 8 CC cross-sectional view.

[0026] Fig.10 yes Fig. 9 A partial enlarged view of I.

[0027] Fig.11 It is a three-dimensional schematic diagram of a connection bracket in a connection structure of a double-coil electromagnetic valve and a thermocouple of a gas appliance with good anti-detachment performance according to the present invention.

[0028] Fig.12 The invention is a three-dimensional schematic diagram of a pin assembly in a double-coil electromagnetic valve and a thermocouple connection structure of a gas appliance with good anti-detachment performance.

[0029] Fig.13 It is a three-dimensional schematic diagram of a base in a connection structure of a double-coil electromagnetic valve and a thermocouple of a gas appliance with good anti-detachment performance according to the present invention.

[0030] Fig.14 It is a stereoscopic schematic diagram from one viewing angle of a connecting plastic cap in a connecting structure of a double-coil solenoid valve and a thermocouple of a gas appliance having good anti-detachment performance according to the present invention.

[0031] Fig.15 It is a stereoscopic schematic diagram from another perspective of the connecting plastic cap in the double-coil solenoid valve and thermocouple connecting structure of a gas appliance with good anti-detachment performance of the present invention.

[0032] Fig.16 The utility model is a three-dimensional schematic diagram of a thermocouple assembly in a double-coil electromagnetic valve and a thermocouple connection structure of a gas appliance with good anti-detachment performance according to the present invention.

[0033] Fig.17 It is a three-dimensional schematic diagram from one perspective of a ground terminal in a double-coil solenoid valve and a thermocouple connection structure of a gas appliance with good anti-detachment performance according to the present invention.

[0034] Fig.18 It is a stereoscopic schematic diagram of another viewing angle of the ground terminal in the double-coil solenoid valve and thermocouple connection structure of a gas appliance with good anti-detachment performance of the present invention.

[0035] 1-solenoid valve connection; 11-connecting bracket; 111-avoidance slot; 112-strip guide notch; 12-pin assembly; 13-base; 131-annular limiting groove; 2-thermocouple connection; 21-connecting plastic cap; 211-clamping arm; 2111-clamping protrusion; 21111-guide slope; 212-annular limiting groove; 213-limiting flange; 2131-limiting flange segment; 214-first strip seam; 215-guide protrusion; 2151-introduction slope; 22-core wire terminal assembly; 3-thermocouple assembly; 31-temperature sensing head element; 32-temperature sensing shell; 4-ground terminal; 41-conductive sleeve; 411-second strip seam; 412-installation notch; 42-wire pressing spring. DETAILED DESCRIPTION

[0036] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0037] Figure 2The schematic diagram of the structure of the double-coil solenoid valve and thermocouple connection structure of a gas appliance with good anti-detachment performance in the present invention is shown. It can be seen that it is mainly composed of several parts such as a solenoid valve connection part 1, a thermocouple connection part 2, a thermocouple assembly 3 and a ground terminal 4, among which the solenoid valve connection part 1 is arranged directly below the thermocouple connection part 2, and the two are plugged into each other.

[0038] Figure 3 , Figure 4 The schematic diagram and exploded diagram of the assembly of the solenoid valve connection part, the thermocouple connection part and the ground wire terminal in the double-coil solenoid valve and thermocouple connection structure of the gas appliance with good anti-detachment performance of the present invention are respectively shown. It can be seen that the solenoid valve connection part 1 includes a connection bracket 11, a pin assembly 12 and a base 13. The pin assembly 12 is built into the above-mentioned base 13 and is placed in the inner cavity of the connection bracket 11 as a whole. The pin assembly 12 includes a main line pin and an auxiliary line pin. The thermocouple connection part 2 includes a connecting plastic cap 21 and a core wire terminal assembly 22 adapted to the above-mentioned pin assembly 12. The core wire terminal assembly 22 is inserted and fixed in the inner cavity of the connecting plastic cap 21, and includes a main line terminal adapted and plugged with the above-mentioned main line pin and an auxiliary line terminal adapted and plugged with the above-mentioned auxiliary line pin. The ground wire terminal 4 is composed of a conductive sleeve 41 and a wire pressing spring 42 formed by the extension of the conductive sleeve 41. The thermocouple assembly 3 includes a temperature-sensing head element 31 and a temperature-sensing shell 32 sleeved on the periphery of the temperature-sensing head element 31, wherein the temperature-sensing head element 31 and the temperature-sensing shell 32 are electrically connected to the pin assembly 12 and the wire-pressing spring 42, respectively. The conductive sleeve 41 is coaxially sleeved with the connecting bracket 11 to realize the grounding function of the temperature-sensing shell 32. A clamping arm 211 is also provided on the connecting plastic cap 21. The number of the clamping arms 211 is at least 2, and they are formed by continuing to extend downward from the lower end surface of the connecting plastic cap 21. A clamping protrusion 2111 extends inward from the free end of each of the above-mentioned clamping arms 211, and correspondingly, an annular limiting groove 131 adapted to the clamping protrusion 2111 is provided around the outer wall of the base 13. Around the connecting bracket 11, there are avoidance slots 111 adapted to the shape of the above-mentioned clamping arm 211, and the number and orientation of the avoidance slots 111 are consistent with those of the clamping arm 211 (such as Figure 5-18 ).

[0039] The working principle of the double-coil solenoid valve and thermocouple connection structure of the gas cooker with good anti-detachment performance is roughly as follows: two conductors of different components (i.e. the above-mentioned temperature-sensing head element 31 and temperature-sensing shell 32) are connected to form a loop. During the normal combustion of the cooker, there is a temperature difference between the temperature-sensing head element 31 and the temperature-sensing shell 32, so a thermoelectric potential is generated. At the same time, the solenoid valve connection part 1 installed in the valve seat is connected and conducted with the thermocouple connection part 2, and the thermocouple assembly 3 is kept in a grounded state. Under the action of the thermoelectric potential, the solenoid valve is kept in an attracted state to ensure the continuous supply of gas. When an accidental flameout occurs, the temperatures of the temperature-sensing head element 31 and the temperature-sensing shell 32 are bound to be the same, the thermocouple assembly 3 will not be able to generate a thermoelectric potential, the solenoid valve is in a disengaged state, and the gas is switched to a closed state.

[0040] By adopting the above technical solution, the following beneficial effects can be produced: 1) the pin assembly 12 is connected to the core wire terminal assembly 22, thereby achieving electrical conduction between the thermocouple assembly 3 and the solenoid valve; and the ground terminal 4 is connected to the connecting bracket 11 to form a reliable grounding of the ground terminal 4. The existence of the ground terminal 4 can effectively achieve the purpose of forming a current loop between the solenoid valve connection part 1 and the thermocouple assembly 3, so that the thermocouple assembly 3 has good grounding performance; 2) The process of connecting the circular terminal at the end of the wire to the valve body by means of screws is omitted, which avoids the consumption of screws and their installation process, greatly reduces the investment in assembly labor, effectively improves the installation efficiency of the stove, and reduces the installation cost; 3) When the solenoid valve connection part 1 and the thermocouple connection part 2 are inserted and connected, the clamping protrusion 2111 is hooked in the annular limiting groove 131, thereby preventing the solenoid valve connection part 1 from being disengaged relative to the thermocouple connection part 2 due to external force, thereby ensuring the reliability and stability of the connection between the two, and ensuring that the ground terminal 4 and the connecting bracket 11 are always kept in contact, thereby ensuring the reliability of the grounding of the thermocouple assembly 3; 4) The problem of entanglement between multiple thermocouple wires during batch assembly in the whole machine factory is avoided, which greatly reduces the investment in assembly labor, effectively improves the installation efficiency, and reduces the installation cost of the stove.

[0041] As a further optimization of the above-mentioned gas appliance double-coil solenoid valve and thermocouple connection structure with good anti-detachment performance, a mounting notch 412 can be opened on the side wall of the conductive sleeve 41, and penetrated along its height direction (such as Fig.17 , 18 As shown in ). In this way, when the ground terminal 4 is sleeved on the connecting plastic cap 21, the presence of the installation notch 412 allows the conductive sleeve 41 to be adaptively expanded along its circumference, thereby effectively reducing the difficulty of installing the ground terminal 4 and improving its installation efficiency.

[0042] Furthermore, the ground terminal 4 is preferably sandwiched between the connecting plastic cap 21 and the connecting bracket 11, and is built into the inner cavity of the connecting bracket 11 and sleeved on the connecting plastic cap 21 (such as Figure 3 , 4 , 5, 6, and 7). In this way, the fit between the conductive sleeve 41 of the ground terminal 4 and the connecting bracket 11 is effectively ensured, the stability and reliability of the electrical conduction between the two are ensured, and the reliability of the grounding of the thermocouple assembly 3 is ensured.

[0043] In order to ensure the certainty and consistency of the position of the ground terminal 4 relative to the connecting plastic cap 21 and prevent it from "moving" during actual application, as a further optimization of the above technical solution, an annular limiting groove 212 can be opened around the outer side wall of the connecting plastic cap 21 to be used for inserting the conductive sleeve 41, and a limiting flange 213 (such as Fig.14 , 15 The conductive sleeve 31 is sleeved in the annular limiting groove 212 and is inserted into the inner cavity of the connecting bracket 11 as a whole (as shown in Figure 3 , 4 , 5, 6, and 7). The clamping arm 211 is formed by extending downwards from the limiting flange 213.

[0044] Furthermore, a first strip-shaped slit 214 may be provided on the connecting plastic cap 21. The number of the first strip-shaped slits 214 is set to be multiple, and the first strip-shaped slits 214 are evenly distributed around the outer side wall of the connecting plastic cap 21. The limiting flange 213 is penetrated by the first strip-shaped slit 214 to form a plurality of limiting flange segments 2131. The clamping arm 211 is formed by the limiting flange segment 2131 extending downward (such as Fig.14 , 15 By adopting the above technical solution, the elasticity of the clamping arm 211 itself is effectively increased, ensuring that it has a sufficient swing amount along the radial direction of the connecting plastic cap 21, so as to be more conducive to the adaptation and clamping with the annular limiting groove 131.

[0045] Of course, as a further optimization of the above technical solution, a guide slope 21111 may be provided on the above-mentioned clamping protrusion 2111, which is formed by inwardly beveling the lower end surface of the clamping arm 211 (such as Fig.14 , 15 As shown in FIG. 1 , the clamping protrusion 2111 can be more smoothly inserted into the annular limiting groove 131, which has a certain automatic guiding function and reduces the difficulty of assembling the solenoid valve connection part 1 and the thermocouple connection part 2. Generally speaking, the inclination angle of the introduction slope 21111 can be controlled at 45-60°.

[0046] Of course, the conductive sleeve 41 can also be designed as a "waist drum" structure, and its side wall is formed by numerous arc lines extending circumferentially in sequence (such as Fig.17 , 18 As shown in ). In this way, when the conductive sleeve 41 is sandwiched in the gap between the connecting plastic cap 21 and the connecting bracket 11, its "waist drum-shaped" structure is in a state of elastic deformation under force, thereby ensuring that the conductive sleeve 41 always elastically leans against the inner wall of the connecting bracket 11, thereby ensuring the stability and reliability of the contact between the conductive sleeve 41 and the connecting bracket 11, and preventing the occurrence of "poor contact".

[0047] It is known that in the actual installation process, the ground terminal 4 is first sleeved on the connecting plastic cap 21, and then the whole is inserted into the inner cavity of the connecting bracket 11. However, due to the "waist drum-shaped" structure of the conductive sleeve 41, it is extremely difficult to perform the insertion operation, and it is very easy to damage the conductive sleeve 41 and cause permanent plastic deformation. In view of this, a second strip slit 411 can also be opened on the conductive sleeve 41. The number of the second strip slits 411 is set to be multiple, and they are evenly distributed circumferentially around the outer side wall of the conductive sleeve 41 (such as Fig.17 , 18 ).

[0048] In order to ensure the "foolproof" operation of assembly, a guide protrusion 215 can be extended outward from the outer side wall of the connecting plastic cap 21, and accordingly, a strip guide notch 112 (such as Figure 3 , 7 , 11, and 14). In the actual assembly process, by rotating and adjusting the relative position relationship of the guide protrusion 215 with respect to the strip-shaped guide notch 112, the alignment accuracy of the connection bracket 11 with respect to the connection plastic cap 21 and the pin assembly 12 with respect to the core wire terminal assembly 22 can be effectively ensured.

[0049] Of course, as a further optimization of the above technical solution, an introduction slope 2151 (such as Fig.14 As shown in ), the guide protrusion 215 can enter the strip-shaped guide notch 112 more smoothly, and has a certain automatic guiding function, which reduces the difficulty of assembly. Generally speaking, the inclination angle of the introduction slope 2151 is controlled at 30-45°.

[0050] Finally, in order to reduce the manufacturing cost of the ground terminal 4 and ensure the molding quality, the conductive sleeve 41 and the wire pressing spring 42 are preferably formed by integral stamping and bending (such as Fig.17 , 18 ).

[0051] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A double-coil solenoid valve and thermocouple connection structure for a gas appliance with good anti-detachment performance, characterized in that: It includes a solenoid valve connection part, a thermocouple connection part, a thermocouple assembly and a ground terminal; the solenoid valve connection part is arranged directly below the thermocouple connection part and is plugged in and connected to each other; the solenoid valve connection part includes a connection bracket, a pin assembly and a base; the pin assembly is built into the base and is inserted into the inner cavity of the connection bracket as a whole; the pin assembly includes a main line pin and an auxiliary line pin; the thermocouple connection part includes a connection plastic cap and a core wire terminal assembly adapted to the pin assembly; the core wire terminal assembly is inserted and fixed in the inner cavity of the connection plastic cap, and includes a main line terminal adapted and plugged in to the main line pin and an auxiliary line terminal adapted and plugged in to the auxiliary line pin; the ground terminal is composed of a conductive sleeve and a wire pressing spring formed by the extension of the conductive sleeve; The thermocouple assembly includes a temperature-sensing head element and a temperature-sensing shell sleeved on the periphery of the temperature-sensing head element, wherein the temperature-sensing head element and the temperature-sensing shell are electrically connected to the pin assembly and the wire-pressing spring sheet respectively; the conductive sleeve is coaxially sleeved with the connecting bracket to realize the grounding function of the temperature-sensing shell; a clamping arm is also provided on the connecting plastic cap; the number of the clamping arms is at least 2, and they are formed by continuing to extend downward from the lower end surface of the connecting plastic cap; a clamping protrusion extends inwardly from the free end of the clamping arm, and correspondingly, an annular limiting groove matched with the clamping protrusion is opened around the outer wall of the base; an avoidance notch matched with the shape of the clamping arm is opened around the connecting bracket, and its number and orientation are consistent with those of the clamping arm.

2. The double-coil solenoid valve and thermocouple connection structure for a gas appliance with good anti-detachment performance according to claim 1 is characterized in that: A mounting notch is provided on the side wall of the conductive sleeve.

3. The double-coil solenoid valve and thermocouple connection structure for a gas appliance with good anti-detachment performance according to claim 2, characterized in that: The ground terminal is sandwiched between the connecting plastic cap and the connecting bracket, is built into the inner cavity of the connecting bracket, and is sleeved on the connecting plastic cap.

4. The double-coil solenoid valve and thermocouple connection structure for a gas appliance with good anti-detachment performance according to claim 3 is characterized in that: An annular limiting groove is provided around the outer side wall of the connecting plastic cap for inserting the conductive sleeve, and a limiting flange is formed at its lower end; the conductive sleeve is sleeved in the annular limiting groove and inserted into the inner cavity of the connecting bracket as a whole; the clamping arm is formed by extending downward from the limiting flange.

5. The double-coil solenoid valve and thermocouple connection structure for a gas appliance with good anti-detachment performance according to claim 4, characterized in that: A first strip seam is provided on the connecting plastic cap; the number of the first strip seams is set to be multiple and is evenly distributed circumferentially around the outer side wall of the connecting plastic cap; the limiting flange is penetrated by the first strip seam to form a plurality of limiting flange segments; the clamping arm is formed by the continued downward extension of the limiting flange segment.

6. The double-coil solenoid valve and thermocouple connection structure for a gas appliance with good anti-detachment performance according to claim 1, characterized in that: A guiding inclined surface is arranged on the clamping protrusion, which is formed by inwardly beveling the lower end surface of the clamping arm.

7. A gas appliance double-coil solenoid valve and thermocouple connection structure with good anti-detachment performance according to any one of claims 1 to 6, characterized in that: The conductive sleeve has a "waist drum-shaped" structure, and its side wall is formed by countless arc lines extending circumferentially in sequence.

8. The double-coil solenoid valve and thermocouple connection structure for a gas appliance with good anti-detachment performance according to claim 7, characterized in that: A second strip-shaped slit is provided on the conductive sleeve; the number of the second strip-shaped slits is set to be multiple and is evenly distributed circumferentially around the outer side wall of the conductive sleeve.

9. A gas appliance double-coil solenoid valve and thermocouple connection structure with good anti-detachment performance according to any one of claims 2 to 5, characterized in that: A guide protrusion extends outward from the outer side wall of the connecting plastic cap, and correspondingly, a strip-shaped guide notch matched with the guide protrusion is opened on the side wall of the connecting bracket; the guide protrusion is matched with the installation notch and passes through the installation notch.

10. The double-coil solenoid valve and thermocouple connection structure for a gas appliance with good anti-detachment performance according to claim 9, characterized in that: Lead-in slopes are arranged on both sides of the insertion end of the guide protrusion.

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