Connecting structure of electromagnetic valve and thermocouple

Abstract

The embodiment of the utility model discloses a connecting structure of an electromagnetic valve and a thermocouple. The connecting structure comprises the thermocouple and the electromagnetic valve. The thermocouple comprises a thermosensitive probe and a plug connector, the thermosensitive probe is connected with the plug connector through a wire, and a protective sleeve is arranged on the plug connector; a valve body of the electromagnetic valve comprises a guide sleeve and a contact pin, and the contact pin is in plug-in fit with the plug connector; wherein the protective sleeve is sequentially divided into a first section, a second section and a third section in the axial direction, the first section wraps one part of the wire, the second section wraps the connecting part of the plug connector and the wire, and the third section is provided with an opening and used for being connected with the guide sleeve in an inserted mode and wrapping the guide sleeve. The utility model provides a connecting structure of an electromagnetic valve and a thermocouple so as to improve the sealing performance, the oxidation resistance and the overall reliability of a connecting part under complex working conditions and prolong the service life of a device.

Description

Technical Field

[0001] This utility model relates to the field of gas appliance technology, and more specifically, to a connection structure between a solenoid valve and a thermocouple. Background Technology

[0002] In gas appliances, to achieve the safety shut-off function after the flame is extinguished, a thermocouple and a solenoid valve are usually used in conjunction for control. Specifically, the thermocouple is installed in the flame heating zone of the appliance. When the flame is burning, it generates a thermoelectric potential, which drives the solenoid valve to be in the open state. Once the flame is extinguished, the thermoelectric potential decays rapidly, and the solenoid valve automatically closes, thereby cutting off the gas supply and providing safety protection.

[0003] During operation, the internal environment of a stove is often subjected to high temperatures or alternating hot and cold conditions, especially the area where thermocouples and solenoid valves are located. Prolonged operation exposes these components to continuous heat radiation or conduction. The harsh high-temperature environment easily leads to oxidation of the thermocouple connectors, affecting their conductivity and structural stability. In existing designs, thermocouples and solenoid valves are typically electrically connected via a plug-in connection, leaving these connectors largely exposed to the external environment. Lacking effective protective structures, these connectors are vulnerable to the corrosive effects of high temperatures and cooking fumes, thus reducing the lifespan and reliability of the connection structure. Summary of the Invention

[0004] In view of the problems in the prior art where stoves are easily exposed to complex environments such as high temperature and oil fumes during combustion, resulting in the exposure of the connection between the thermocouple and the solenoid valve and the easy oxidation of the connector, the purpose of this utility model is to provide a connection structure between the solenoid valve and the thermocouple to improve the sealing and oxidation resistance of the connection under complex working conditions and extend the service life of the device.

[0005] The technical solution adopted by this utility model is as follows: A connection structure between a solenoid valve and a thermocouple is provided, including a thermocouple and a solenoid valve. The thermocouple includes a thermistor and a connector. The thermistor is connected to the connector via a wire, and the connector is provided with a protective sleeve. The valve body of the solenoid valve includes a guide sleeve and a pin, which is inserted into the connector. The protective sleeve is divided into a first section, a second section, and a third section along the axial direction. The first section covers a portion of the wire, the second section covers the connection between the connector and the wire, and the third section has an opening for insertion into and covering the guide sleeve.

[0006] Compared with the prior art, this utility model uses a segmented protective sleeve to cover the connection area between the thermocouple and the solenoid valve in sections. The first section protects the wire from external pulling or high-temperature damage, the second section enhances the stability and oxidation resistance of the connection between the connector and the wire, and the third section forms an effective barrier through the insertion and sealing with the guide sleeve of the solenoid valve, preventing heat, oil fumes, water vapor and other substances from entering the connection area. This significantly improves the reliability and durability of the overall structure in high-temperature and complex environments, thus effectively solving the technical problems of unstable connection and easy oxidation failure mentioned in the background art.

[0007] According to one embodiment of this utility model, the protective sleeve is made of hard or soft rubber. Soft rubber has good flexibility and shock resistance, which can effectively buffer the vibration and impact between the thermocouple and the solenoid valve, and is suitable for scenarios with drastic changes in the operating environment; while hard rubber has higher structural strength and deformation resistance, and is suitable for structural applications that require support and fixation.

[0008] According to one embodiment of this utility model, the protective sleeve includes a rigid skeleton and a flexible covering layer covering the surface of the skeleton. This structure combines the high strength and high support performance of the rigid skeleton with the good sealing and shock resistance of the flexible covering layer, combining the advantages of both hard and soft rubber materials. This not only improves the structural strength but also enhances the environmental adaptability, thereby further improving the reliability and durability of the overall connection structure under high-intensity use and complex working conditions.

[0009] According to one embodiment of this utility model, the opening of the third section of the protective sleeve is chamfered to guide the insertion of the guide sleeve. This design can significantly improve the smoothness and ease of operation of the insertion process and reduce the alignment difficulty during assembly.

[0010] According to one embodiment of this utility model, the inner wall of the third section of the protective sleeve protrudes inward to form several constricted sections, which are used to enhance the locking fit with the guide sleeve. The constricted diameter structure forms a mechanical locking mechanism, effectively preventing loosening or slippage and enhancing insertion stability and sealing.

[0011] According to one embodiment of this utility model, the thermal probe is connected to a grounding wire. The grounding structure improves the electrical safety of the system and provides a discharge path in the event of abnormal current, enhancing the equipment's anti-interference capability.

[0012] According to one embodiment of the present invention, the solenoid valve includes a valve cover, a valve seat, a valve shaft, and a bracket. The valve shaft is elastically mounted on the head of the valve cover, the valve seat is fixedly mounted on the tail of the valve cover, the bracket is fixedly mounted on the valve seat, and the guide sleeve is disposed on the tail of the valve seat.

[0013] According to one embodiment of the present invention, the valve shaft is connected to a moving iron core, the valve seat is equipped with a stationary iron core, and both the stationary iron core and the moving iron core are located inside the valve cover.

[0014] According to one embodiment of this utility model, a spring is sleeved on the valve shaft, and the spring has an elastic tendency to keep the moving iron core disconnected from the stationary iron core. This spring structure provides a restoring force, which helps the solenoid valve to automatically return to its original position when there is no power, realizing a safe shut-off function and improving safety.

[0015] According to one embodiment of this utility model, the radii of the first, second, and third segments of the protective sleeve increase sequentially along the axial direction. This structure facilitates segmented covering and insertion, improves the sealing transition and structural strength of the assembly, and enhances the overall protective effect and processing convenience. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a perspective view of the connection structure in an embodiment of this utility model.

[0018] Figure 2 This is an exploded view of the connection structure in an embodiment of this utility model.

[0019] Figure 3 This is a perspective view of the thermocouple in an embodiment of this utility model.

[0020] Figure 4 This is a cross-sectional view of the thermocouple in an embodiment of this utility model.

[0021] Figure 5 This is a half-sectional view of the protective sleeve in an embodiment of this utility model.

[0022] Figure 6 This is a perspective view of the protective sleeve in an embodiment of this utility model.

[0023] Figure 7 This is a half-sectional perspective view of the protective sleeve in an embodiment of this utility model.

[0024] Figure 8 This is a perspective view of the solenoid valve in an embodiment of this utility model.

[0025] Figure 9 This is a cross-sectional view of the solenoid valve in an embodiment of this utility model.

[0026] Figure 10 This is a half-sectional perspective view of the solenoid valve in an embodiment of this utility model.

[0027] Explanation of the labels in the diagram:

[0028] 10. Thermocouple; 20. Solenoid valve;

[0029] 11. Connector; 12. Protective sleeve; 13. Thermal probe; 14. Wire; 15. Grounding wire;

[0030] 12a, First section; 12b, Second section; 12c, Third section; 12d, Chamfer; 12e, Reduced diameter section;

[0031] 21. Valve cover; 22. Valve seat; 23. Valve shaft; 24. Moving iron core; 25. Stationary iron core; 26. Spring; 27. Bracket; 28. Guide sleeve; 29. ​​Pin. Detailed Implementation

[0032] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model. Example 1

[0033] like Figure 1-10 As shown, this embodiment discloses a connection structure between a solenoid valve 20 and a thermocouple 10, including a thermocouple 10 and a solenoid valve 20. The thermocouple 10 includes a thermistor 13 and a connector 11. The thermistor 13 is connected to the connector 11 via a wire 14. A protective sleeve 12 is provided on the outside of the connector 11 to cover and protect the connection between the wire 14 and the connector 11. The valve body of the solenoid valve 20 includes a guide sleeve 28 and a pin 29. The pin 29 is used to insert and cooperate with the connector 11 of the thermocouple 10 to realize the transmission of thermoelectric signals. The guide sleeve 28 is disposed at the tail of the solenoid valve 20 to cover the pin 29 and form an insertion guide structure with the connector 11.

[0034] Specifically, in combination Figure 5-7As shown, the protective sleeve 12 is divided into three sections along the axial direction: a first section 12a, a second section 12b, and a third section 12c. The first section 12a wraps around a portion of the conductor 14, ensuring that this portion of the conductor 14 is isolated from the external environment, preventing moisture, salt spray, or other corrosive substances from penetrating the conductive layer of the conductor 14. The remaining portion of the conductor 14 itself has a protective insulating layer. The second section 12b wraps around the connection between the connector 11 and the conductor 14. This connection is typically welded or crimped and is the weakest and most susceptible to corrosion in the entire connection structure. Using a middle transition section for wrapping significantly improves its reliability. The third section 12c has an opening that engages with the guide sleeve 28, effectively covering the guide sleeve 28 and forming a tightly sealed connection structure. The electrical connection between the connector 11 and the pin 29 is completely enclosed within the sealed space formed by the protective sleeve 12 and the guide sleeve 28, preventing the connection point from being exposed to the outside environment and significantly improving the structural sealing, corrosion resistance, and service life.

[0035] Furthermore, the outer diameter of the first segment 12a, the second segment 12b, and the third segment 12c of the protective sleeve 12 increases progressively along the axial direction. This structural design facilitates a smooth transition from the thin wire 14 to the coarse guide sleeve 28.

[0036] Specifically, the protective cover 12 can be made of hard or soft rubber. Soft rubber has good flexibility and shock absorption performance, and can effectively absorb mechanical impact in application scenarios with strong vibration or frequent dynamic impact, preventing the connection structure from loosening; while hard rubber has strong structural strength and dimensional stability, making it suitable for use in occasions with high requirements for deformation control and fixation.

[0037] Specifically, in this embodiment, the protective sleeve 12 is made of soft rubber, which can be any of the following materials: rubber, silicone rubber, TPU, TPE, soft PVC, etc., with soft PVC being preferred. The above-mentioned soft rubber materials have good flexibility, shock resistance, and resistance to high and low temperatures, and can maintain a stable shape and sealing effect in environments with alternating hot and cold temperatures or severe vibrations. Silicone has a wide temperature resistance range and is suitable for high-temperature environments; TPE has a soft feel and good moldability, making it suitable for covering complex curved surface structures.

[0038] In other structures, the protective sleeve 12 can also be made of rigid plastic, such as common engineering plastics including polyamide (PA, nylon), polycarbonate (PC), polyoxymethylene (POM), polypropylene (PP), and polyphenylene oxide (PPO). These materials have high structural strength, dimensional stability, and processing efficiency, making them suitable for load-bearing and fixing structures. Among them, nylon (PA) has high strength and good wear resistance, and is widely used in mechanical connection parts; polycarbonate (PC) has excellent impact resistance and transparency, making it suitable for viewing windows or structural supports.

[0039] Furthermore, some special plastic materials can be selected to make protective sleeves 12, such as polytetrafluoroethylene (PTFE), polyetheretherketone (PEEK), and polyphenylene sulfide (PPS). These materials have excellent chemical corrosion resistance, high temperature resistance, and flame retardant properties, and are suitable for electrical interface applications in extremely harsh environments or with high long-term stability requirements.

[0040] Specifically, in some other embodiments, the protective sleeve 12 includes a rigid skeleton and a flexible covering layer covering the surface of the skeleton. This structure combines the support performance of rigid materials with the sealing and cushioning performance of flexible materials, providing more stable and reliable protection in complex environments. It is particularly suitable for use in long-term, high-intensity operating conditions, improving the durability and environmental adaptability of the connection structure.

[0041] Specifically, in combination Figure 7 As shown, in this embodiment, the opening of the third segment 12c of the protective sleeve 12 is provided with a chamfered 12d structure to guide the guide sleeve 28 to be smoothly inserted into the protective sleeve 12. This chamfered 12d structure facilitates the insertion and alignment, avoids structural damage caused by insertion difficulties, jamming, or forced insertion, and improves assembly efficiency and consistency.

[0042] Furthermore, the inner wall of the third section 12c of the protective sleeve 12 is provided with several concentric rings of reduced diameter portions 12e distributed along the circumference. The reduced diameter portions 12e protrude inward, forming a mechanical locking structure with the guide sleeve 28. This structure enhances the locking force between the protective sleeve 12 and the guide sleeve 28, preventing the connection from loosening or falling off due to vibration, pulling, or temperature changes after insertion, and further improving assembly stability and sealing effect.

[0043] Specifically, in combination Figure 1-4 As shown, in this embodiment, the thermal probe 13 is also connected to a grounding wire 15, which is used to effectively introduce electromagnetic interference signals or electrostatic charges to the ground, thereby improving the overall electrical safety performance of the system.

[0044] Specifically, in combination Figure 8-10 As shown, in this embodiment, the solenoid valve 20 includes a valve cover 21, a valve seat 22, a valve shaft 23, and a bracket 27. The head of the valve cover 21 is used to accommodate the elastically mounted valve shaft 23. The valve seat 22 is fixedly mounted on the tail of the valve cover 21, serving as the fixed end of the electromagnetic coil magnetic circuit. The bracket 27 is mounted on the valve seat 22, providing the structural support and component positioning required for the electromagnet. The guide sleeve 28 is mounted on the tail of the valve seat 22, serving to protect and guide the insertion of the pin 29, and also as the joint for the insertion of the protective sleeve 12.

[0045] Furthermore, the valve shaft 23 is connected to a moving iron core 24, and the valve seat 22 is equipped with a stationary iron core 25, both located within the internal space of the valve cover 21. A coil (not shown in the figure) is fitted onto the stationary iron core 25, and the coil is electrically connected to the pin 29, forming an electromagnet with the stationary iron core 25. When the thermal probe 13 is heated, it generates a thermoelectric potential that energizes the electromagnet. Under the magnetic force of the electromagnet, the moving iron core 24 moves axially and adheres to the stationary iron core 25, driving the valve shaft 23 to move. In the de-energized state, the moving iron core 24 disengages from the stationary iron core 25 under the action of the spring 26 and returns to its initial position.

[0046] Furthermore, combining Figure 10 As shown, a spring 26 is sleeved on the outside of the valve shaft 23. The spring 26 is located between the valve shaft 23 and the valve cover 21 and is kept in an axially compressed state. The spring 26 is used to provide a restoring force, so that the moving iron core 24 quickly returns to the position where it is disconnected from the stationary iron core 25 after the electromagnetic attraction disappears, ensuring that the solenoid valve 20 has the function of automatic closing, thereby improving the safety of equipment operation.

[0047] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0048] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0049] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0050] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A connection structure between a solenoid valve and a thermocouple, comprising a thermocouple and a solenoid valve, characterized in that, The thermocouple includes a thermistor and a connector. The thermistor is connected to the connector via a wire, and the connector is provided with a protective sleeve. The solenoid valve body includes a guide sleeve and a pin, the pin being inserted into a connector. The protective sleeve is divided into a first section, a second section, and a third section along the axial direction. The first segment covers a portion of the wire, the second segment covers the connection between the connector and the wire, and the third segment has an opening for insertion into and covering the guide sleeve.

2. The connection structure between a solenoid valve and a thermocouple according to claim 1, characterized in that: The protective case is made of hard or soft rubber.

3. The connection structure between the solenoid valve and the thermocouple according to claim 1, characterized in that: The protective sleeve includes a rigid frame and a flexible covering layer that covers the surface of the frame.

4. The connection structure between a solenoid valve and a thermocouple according to claim 1, characterized in that: The opening of the third section of the protective sleeve is chamfered to guide the insertion of the guide sleeve.

5. The connection structure between the solenoid valve and the thermocouple according to claim 4, characterized in that: The inner wall of the third section of the protective sleeve protrudes inward to form several constricted sections, which are used to enhance the locking fit with the guide sleeve.

6. The connection structure between the solenoid valve and the thermocouple according to claim 1, characterized in that: The thermal probe is connected to a grounding wire.

7. The connection structure between a solenoid valve and a thermocouple according to claim 1, characterized in that: The solenoid valve includes a valve cover, a valve seat, a valve shaft, and a bracket. The valve shaft is elastically mounted on the head of the valve cover, the valve seat is fixedly mounted on the tail of the valve cover, the bracket is fixedly mounted on the valve seat, and the guide sleeve is disposed on the tail of the valve seat.

8. The connection structure between the solenoid valve and the thermocouple according to claim 7, characterized in that: The valve shaft is connected to a moving iron core, and the valve seat is equipped with a stationary iron core. Both the stationary iron core and the moving iron core are located inside the valve cover.

9. The connection structure between a solenoid valve and a thermocouple according to claim 8, characterized in that: The valve shaft is fitted with a spring, which has an elastic tendency to keep the moving iron core disconnected from the stationary iron core.

10. A connection structure between a solenoid valve and a thermocouple according to any one of claims 1-9, characterized in that: The radii of the first, second, and third sections of the protective sleeve increase sequentially along the axial direction.

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