High-temperature fuse gas ball valve and gas safety control system

Abstract

The utility model discloses a high temperature fuse gas ball valve and gas safety control system relates to gas ball valve technical field, including valve body subassembly, is equipped with air inlet channel, air outlet channel and valve cavity, valve ball is located in the valve cavity, high temperature fuse mechanism is located at air inlet channel entrance, including fuse support, fuse valve core and fuse spring, through low temperature solder fixed fuse valve core and fuse support, when overtemperature, solder melts, and fuse spring pushes fuse valve core and realizes hard sealing cut-off, overcurrent cut-off mechanism includes overcurrent valve core, overcurrent support, cut-off spring and sealing pad, and overcurrent valve core displacement leans against sealing pad and realizes sealing when flow is over limit, insulation valve cover subassembly includes metal insert and the PE insulating layer that covers its outside, is used for electrical isolation valve body and external pipeline, the utility model solves the deficiency of existing gas valve in high temperature, overcurrent and insulation protection, provides a kind of compact structure, trigger sensitive, sealing reliable and the multiple safety gas ball valve of insulating performance lasting.

Description

Technical Field

[0001] This utility model relates to the field of gas ball valve technology, specifically to a high-temperature fusion gas ball valve and a gas safety control system. Background Technology

[0002] In the field of gas ball valve technology, existing technologies have developed various valve designs with single safety functions, such as ball valve structures that independently achieve overcurrent cutoff, high-temperature melting, or insulation protection. However, these solutions generally suffer from defects such as functional isolation, structural redundancy, and insufficient reliability. Specifically, existing valves are unable to cope with complex accident scenarios (such as combined overcurrent and high-temperature failures caused by pipeline rupture accompanied by fire), and multiple functions are usually achieved by piecing together external modules, resulting in large valve size and high cost. At the same time, traditional thermal elements have slow response, sealing materials are prone to failure at high temperatures, and the valve cover insulation structure is also susceptible to aging or mechanical impact due to its simple design, reducing overall safety performance. In addition, although existing patent literature involves some functional combinations, none of them have achieved integrated high-temperature melting, overcurrent cutoff, and insulation functions. In particular, there are significant gaps in the hard-seal triggering mechanism of the melting component, the built-in compact design of the overcurrent valve core, and the PE injection molding insulation process of the valve cover, which cannot meet the gas system's requirements for efficient, compact, and reliable safety protection. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a high-temperature fusion gas ball valve and a gas safety control system, which aims to solve the shortcomings of existing gas valves in terms of high temperature, overcurrent and insulation protection, and to provide a multi-safety gas ball valve with compact structure, sensitive triggering, reliable sealing and long-lasting insulation performance.

[0004] To solve the above problems, the technical solution provided by this utility model is as follows:

[0005] A high-temperature fusible gas ball valve, comprising

[0006] The valve body assembly is provided with an air inlet passage, an air outlet passage, and a valve chamber;

[0007] The valve ball, located inside the valve cavity, is used to control the on / off of gas supply;

[0008] The high-temperature fusion mechanism is located at the inlet of the air intake channel and includes a fusion bracket, a fusion valve core and a fusion spring. The fusion valve core and the fusion bracket are fixed by low-temperature solder. When the temperature exceeds the limit, the solder melts and the fusion spring pushes the fusion valve core to achieve hard sealing and cut-off.

[0009] The overflow cut-off mechanism is integrated inside the valve ball, including an overflow valve core, an overflow support, a cut-off spring, and a sealing gasket. When the flow exceeds the limit, the overflow valve core moves to press against the sealing gasket to achieve a seal.

[0010] An insulating valve cover assembly, comprising a metal insert and a PE insulating layer covering the outside, is used to electrically isolate the valve body from external piping.

[0011] The overall basic structure of the gas ball valve comprises five core parts: the valve body assembly, the valve ball, the high-temperature fusion mechanism, the overcurrent shut-off mechanism, and the insulating valve cover assembly. The function of this claim is to establish an integrated framework with a triple safety mechanism, achieving coordinated protection through structural innovation of automatic high-temperature shut-off, automatic overcurrent protection, and electrical insulation, fundamentally solving the problems of traditional gas valves' single function and delayed response.

[0012] Optionally, the high-temperature fusing mechanism has a welding melting point of 100℃±5℃, the solder is a tin-based alloy, and a metal conical sealing structure is used between the fusing valve core and the valve body air inlet channel.

[0013] The specific parameters and sealing form of the high-temperature melting mechanism are further defined to ensure the accuracy and reliability of the high-temperature triggering mechanism. By specifying the welding melting point tolerance (±5℃) and the tin-based alloy solder material, the consistency of the high-temperature response is guaranteed; the hard sealing structure (metal conical seal) avoids the risk of polymer seals failing at high temperatures.

[0014] Optionally, the overcurrent cut-off mechanism has an overcurrent valve core with a guide shoulder, an overcurrent bracket with a corresponding guide hole, and a cut-off spring acting on the rear end of the overcurrent valve core to keep it in the open position under normal flow conditions.

[0015] By designing a mating structure between the guide shoulder and the guide hole, the function is to ensure the stability of the overcurrent valve core's movement during operation, preventing sealing failure or reset malfunction caused by misalignment. Simultaneously, the effective position of the cut-off spring is clearly defined to ensure the repeatability of the overcurrent protection.

[0016] Alternatively, the metal insert of the insulating valve cover assembly is made of brass, and the PE insulation layer is wrapped around the outside of the insert through injection molding to form an integral insulation structure.

[0017] Mechanical strength is ensured by brass inserts, while permanent insulation protection is achieved through PE injection molding. This structural design balances installation torque capacity requirements with electrical safety performance.

[0018] Optionally, the sealing gasket of the overcurrent cut-off mechanism is made of rubber or polytetrafluoroethylene, and the front end of the overcurrent valve core is provided with an installation groove for fixing the sealing gasket.

[0019] Optimize sealing performance for overcurrent sealing scenarios. Rubber or PTFE materials provide an elastic sealing interface, ensuring sealing reliability while reducing valve core movement resistance.

[0020] Optionally, the fuse support of the high-temperature fuse mechanism is threadedly connected to the valve body assembly and is equipped with a sealing ring to prevent gas leakage.

[0021] The threaded connection method between the fusible link bracket and the valve body, as well as the configuration of the sealing ring, are clearly defined. Their function is to achieve modular installation and auxiliary sealing, which facilitates maintenance and replacement while preventing gas leakage.

[0022] Optionally, the valve ball is provided with a fluid channel, the overflow cut-off mechanism is located in the middle of the channel, and the displacement direction of the overflow valve core is parallel to the fluid flow direction.

[0023] Utilizing fluid dynamics characteristics to improve response sensitivity. By placing the flow valve core in the middle of the channel and arranging it parallel to the flow direction, pressure sensing efficiency is optimized.

[0024] Optionally, the insulating valve cover assembly and the valve body assembly are connected by threads and an airtight seal is achieved by an O-ring.

[0025] This ensures the overall structural integrity of the seal. Threaded connections provide mechanical strength, while O-rings compensate for sealing gaps caused by machining tolerances.

[0026] A gas safety control system includes a high-temperature fusible gas ball valve and is connected to a gas pipeline and a user terminal.

[0027] Coordinated safety control of regulating valves, pipelines, and user terminals.

[0028] Compared with the prior art, the technical solution provided by this utility model has the following advantages:

[0029] The three safety mechanisms are independent yet complementary, and can cope with complex faults;

[0030] The built-in valve ball in the flow-through component significantly reduces its size, and the high-temperature melting hard seal provides excellent high-temperature resistance.

[0031] PE injection molded insulating valve covers combine mechanical strength with insulation reliability;

[0032] The overcurrent protection automatically resets after the flow rate returns to normal, reducing the need for manual intervention. Attached Figure Description

[0033] Figure 1 A cross-sectional view of a high-temperature fusible gas ball valve proposed for an embodiment of this utility model;

[0034] Figure 2 A partial cross-sectional view of a high-temperature fusible gas ball valve proposed for an embodiment of this utility model;

[0035] Figure 3 A cross-sectional perspective view of a high-temperature fusible gas ball valve proposed for an embodiment of this utility model;

[0036] 1. Valve body assembly; 2. Fusible bracket; 3. Fusible spring; 4. Fusible valve core; 5. Overflow valve core; 6. Cut-off spring; 7. Overflow bracket; 8. Sealing gasket; 9. Valve ball; 10. Valve cover insert; 11. PE insulation layer; 12. External thread insert. Detailed Implementation

[0037] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings and embodiments.

[0038] Example 1

[0039] Combined with appendix Figure 1-3 A high-temperature fusible gas ball valve includes a valve body assembly 1 with an inlet channel, an outlet channel, and a valve chamber; a valve ball 9, located within the valve chamber, for controlling the flow of gas; a high-temperature fusible mechanism located at the inlet of the inlet channel, including a fusible support 2, a fusible valve core 4, and a fusible spring 3, wherein the fusible valve core 4 and the fusible support 2 are fixed by low-temperature solder, and when the temperature exceeds the limit, the solder melts and the fusible spring 3 pushes the fusible valve core 4 to achieve a hard seal cutoff; an overcurrent cutoff mechanism integrated inside the valve ball 9, including an overcurrent valve core 5, an overcurrent support 7, a cutoff spring 6, and a sealing gasket, wherein when the flow exceeds the limit, the overcurrent valve core 5 displaces and presses against the sealing gasket to achieve a seal; and an insulating valve cover assembly including a metal insert and a PE insulating layer 11 covering the outside, for electrically isolating the valve body from external pipelines. Under normal operating conditions, gas enters through the inlet channel of the valve body assembly 1 and is controlled to flow by the valve ball 9. When the ambient temperature exceeds the set threshold (100℃±5℃), the low-temperature solder of the high-temperature fusion mechanism melts, and the fusion spring 3 pushes the fusion valve core 4 to achieve hard sealing and cut-off; when the flow rate increases abnormally, the overcurrent cut-off mechanism drives the overcurrent valve core 5 to shift and seal through the dynamic balance between the fluid pressure and the force of the cut-off spring 6; the insulating valve cover assembly permanently isolates the metal parts through the PE insulation layer 11, forming an electrical safety barrier.

[0040] The high-temperature fusing mechanism has a welding melting point of 100℃±5℃, and the solder is a tin-based alloy. A metal conical sealing structure is used between the fusing valve core 4 and the valve body air inlet channel. At room temperature, the tin-based solder maintains a solid structure, fixing the fusing valve core 4 and the fusing bracket 2. When the ambient temperature reaches the critical point, the solder melts instantaneously, releasing the preload of the fusing spring 3, and pushing the conical surface of the fusing valve core 4 to form a metal-metal seal with the valve body channel. This sealing mechanism can withstand the continuous high temperature in a fire scenario.

[0041] The overflow cut-off mechanism has an overflow valve core 5 with a guide shoulder, and an overflow bracket 7 with a corresponding guide hole. The cut-off spring 6 acts on the rear end of the overflow valve core 5 to keep it in the open position under normal flow conditions. Under normal flow conditions, the fluid pressure and the thrust of the cut-off spring 6 are balanced, and the overflow valve core 5 remains in the open position. When the flow exceeds the limit, the inlet pressure increases, pushing the overflow valve core 5 to move along the guide shoulder, compressing the cut-off spring 6 and pressing the sealing gasket against the valve ball 9 passage. After the pressure returns to normal, the cut-off spring 6 precisely pushes the valve core back to its original position along the guide structure.

[0042] The metal insert of the insulating valve cover assembly is made of brass, and the PE insulation layer 11 is encapsulated on the outside of the insert through injection molding to form an integral insulation structure. During the injection molding process, the PE material completely encapsulates the brass insert, forming a continuous insulation layer. When external current attempts to be conducted through the valve body, the high resistance of the PE layer blocks the current path, making the potential at the gas pipeline end zero, fundamentally preventing gas explosions caused by electrical sparks.

[0043] The sealing gasket of the overcurrent cut-off mechanism is made of rubber or polytetrafluoroethylene, and the front end of the overcurrent valve core 5 has an installation groove for fixing the sealing gasket. The installation groove at the front end of the overcurrent valve core 5 fixes the sealing gasket. When the valve core is displaced, the sealing gasket fits against the wall of the valve ball 9 channel in an elastic deformation manner to form a soft seal; the material selection ensures that it is not prone to aging during long-term use in gas media.

[0044] The high-temperature fusible link mechanism's fusible link bracket 2 is threadedly connected to the valve body assembly 1, and a sealing ring is provided to prevent gas leakage. The threaded connection provides stable mechanical fixation, and the sealing ring forms a secondary sealing barrier at the thread engagement point. When the fusible link mechanism is activated, this connection structure can withstand the impact force of the fusible link spring 3 without loosening.

[0045] The valve ball 9 has a fluid channel, and the overcurrent cut-off mechanism is located in the middle of the channel. The displacement direction of the overcurrent valve core 5 is parallel to the fluid flow direction. When the fluid flows through the valve ball 9 channel, it acts directly on the end face of the overcurrent valve core 5. The displacement direction of the valve core is parallel to the flow direction, which reduces flow resistance loss and makes the overcurrent protection trigger more quickly.

[0046] The insulating valve cover assembly and valve body assembly 1 are connected by threads and an O-ring achieves an airtight seal. During installation, the threads provide axial clamping force, causing the O-ring to elastically deform and fill the microscopic gaps, forming an airtight seal. This structure maintains its sealing performance even with temperature changes.

[0047] A gas safety control system includes a high-temperature fusible gas ball valve, which is connected to a gas pipeline and a user terminal. When any abnormality occurs in any part of the system (such as pipeline pressure fluctuations or user-end leakage), the ball valve's triple protection mechanism is linked with the system monitoring equipment to form a multi-layered protection system.

[0048] The installation method of the gas ball valve, including the step-by-step assembly process of the high-temperature fusion mechanism, the overcurrent shut-off mechanism, and the insulating valve cover assembly, includes the following steps:

[0049] 1. First step: Carefully place the fusible valve core 4 into the special welding fixture;

[0050] Step 2: Insert the fuse spring 3;

[0051] Step 3: Align the fuse bracket 2 with the fuse valve core 4 and screw it smoothly into the welding fixture;

[0052] Step 4: Use constant temperature welding wire to firmly weld the fusion valve core 4 and the fusion bracket 2;

[0053] Step 5: Screw the fuse assembly: fuse bracket 2, fuse spring 3 and fuse valve core 4 into the air inlet end of valve body assembly 1, which will instantly shut off the air inlet source in case of abnormal high temperature.

[0054] 2. First step: Put the shut-off spring 6 onto the overcurrent valve core 5;

[0055] Step 2: Place the overcurrent valve core 5 with the cut-off spring 6 attached into the corresponding small hole of the overcurrent bracket 7;

[0056] Step 3: Press the sealing gasket into groove 5 of the overflow valve core;

[0057] Step 4: Press the assembled valve core assembly: overflow valve core 5, cut-off spring 6, overflow bracket 7, and sealing gasket 8 into the valve ball 9;

[0058] Step 5: Install the valve core assembly: overflow valve core 5, cut-off spring 6, overflow bracket 7, and sealing gasket 8 into the valve body assembly 1, which will automatically close or adjust the valve when the air flow at the inlet is abnormal;

[0059] 3. Step 1: Injection mold the valve cover insert 10 and the external thread insert 12 together using a PE insulating layer 11;

[0060] Step 2: Screw the insulating valve cover assembly (valve cover insert 10, PE insulation layer 11, and external thread insert 12) into the valve body assembly 1. After the user connects to the gas connection pipe, the insulation effect is achieved. Through a step-by-step assembly process (such as first welding the fuse assembly, then pressing in the overcurrent valve core 5, and finally injection molding the valve cover), the assembly accuracy and relative positional relationship of each functional module are ensured, so that the protection mechanism operates as designed.

[0061] Ensure proper assembly of the triple safety mechanism during installation to prevent functional failure due to installation errors. Guarantee assembly precision and consistency: Clearly defined steps and the use of specialized tooling avoid human error in assembly, ensuring that each functional module (such as the welding position of the fusible valve core 4 to the bracket, the preload of the overcurrent valve core 5 to the cut-off spring 6, and the injection molding thickness of the insulation layer) meets design specifications. This standardized process is particularly suitable for mass production and effectively maintains product quality stability.

[0062] Achieving functional synergy and reliability: The step-by-step assembly process ensures effective control over the spatial layout and motion interference between various safety mechanisms. For example, the independent assembly of the fuse mechanism and the overcurrent mechanism is completed before overall integration, avoiding mutual interference between functional components within the confined valve body, thereby ensuring the hard sealing effect of high-temperature fuse, the sensitive response of overcurrent cut-off, and the integrity of insulation protection.

[0063] Improving production efficiency and maintainability: By breaking down the complex assembly process into logically clear sub-steps, operational difficulty is reduced, and production efficiency and product consistency are improved. At the same time, standardized assembly logic provides clear guidance for subsequent maintenance and replacement. When a functional module needs repair, technicians can refer to this method for modular replacement, reducing maintenance costs.

[0064] The assembly and operation principle of the high-temperature fusing mechanism is as follows: First, the fusing valve core 4 is positioned in a special welding fixture. Then, the fusing spring 3 is installed and aligned with the fusing bracket 2, and fixed-point welding is performed using a constant-temperature welding wire. The core of this step is to ensure the accuracy and consistency of the solder melting temperature (100℃±5℃). After welding, the entire assembly is screwed into the valve body's air inlet end, at which point the fusing spring 3 is in a pre-compressed state. When the ambient temperature rises abnormally, the weld point melts at the designed temperature, releasing the fusing spring 3 to drive the valve core to instantly cut off the gas path. Its response reliability directly depends on the precise control of welding quality during assembly.

[0065] The assembly and operation principle of the overcurrent cut-off mechanism: After the overcurrent valve core 5 is fitted with the cut-off spring 6, it is installed into the overcurrent bracket 7, the sealing gasket is pressed into the valve core groove, and the whole assembly is pressed into the valve ball 9 channel. This assembly process ensures that the overcurrent valve core 5 can move freely axially within the valve ball 9, and that the sealing gasket is precisely aligned with the channel wall. When the flow rate in the pipeline is abnormal, the fluid pressure pushes the valve core to compress the cut-off spring 6, causing the sealing gasket to press tightly against the channel wall to achieve a seal; after the flow rate returns to normal, the cut-off spring 6 pushes the valve core to precisely reset. The assembly quality directly determines the sensitivity and reset accuracy of the overcurrent protection.

[0066] Assembly and operation principle of the insulating valve cover assembly: The valve cover insert 10 and the external thread insert 12 are formed into an integral insulating structure through PE injection molding, and then screwed into the valve body. The injection molding process ensures that the PE insulation layer 11 continuously and completely covers the metal insert, without defects such as pores or uneven thickness. After assembly, the insulation layer forms a reliable electrical isolation between the valve body and the external pipeline. In the event of a leakage accident, it can effectively block the current conduction through the valve, preventing the gas pipeline from becoming energized and generating electric sparks. This method ensures the durability and stability of the insulation performance through process control.

[0067] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A high-temperature fusible gas ball valve, characterized in that, include The valve body assembly is provided with an air inlet passage, an air outlet passage, and a valve chamber; The valve ball, located inside the valve cavity, is used to control the on / off of gas supply; The high-temperature fusion mechanism is located at the inlet of the air intake channel and includes a fusion bracket, a fusion valve core and a fusion spring. The fusion valve core and the fusion bracket are fixed by low-temperature solder. When the temperature exceeds the limit, the solder melts and the fusion spring pushes the fusion valve core to achieve hard sealing and cut-off. The overflow cut-off mechanism is integrated inside the valve ball, including an overflow valve core, an overflow support, a cut-off spring, and a sealing gasket. When the flow exceeds the limit, the overflow valve core moves to press against the sealing gasket to achieve a seal. An insulating valve cover assembly, comprising a metal insert and a PE insulating layer covering the outside, is used to electrically isolate the valve body from external piping.

2. The high-temperature fusible gas ball valve according to claim 1, characterized in that, The high-temperature melting mechanism has a welding melting point of 100℃±5℃, the solder is a tin-based alloy, and a metal conical sealing structure is used between the melting valve core and the valve body air inlet channel.

3. A high-temperature fusible gas ball valve according to claim 1, characterized in that, The overcurrent cut-off mechanism has an overcurrent valve core with a guide shoulder, an overcurrent bracket with a corresponding guide hole, and a cut-off spring acting on the rear end of the overcurrent valve core to keep it in the open position under normal flow conditions.

4. A high-temperature fusible gas ball valve according to claim 1, characterized in that, The metal insert of the insulating valve cover assembly is made of brass, and the PE insulation layer is wrapped around the outside of the insert through injection molding to form an integral insulation structure.

5. A high-temperature fusible gas ball valve according to claim 1, characterized in that, The sealing gasket of the overcurrent cut-off mechanism is made of rubber or polytetrafluoroethylene, and the front end of the overcurrent valve core is provided with an installation groove for fixing the sealing gasket.

6. A high-temperature fusible gas ball valve according to claim 1, characterized in that, The high-temperature fusing mechanism has a threaded connection between the fusing bracket and the valve body assembly, and is equipped with a sealing ring to prevent gas leakage.

7. A high-temperature fusible gas ball valve according to claim 1, characterized in that, The valve ball is provided with a fluid channel, and the overflow cut-off mechanism is located in the middle of the channel. The displacement direction of the overflow valve core is parallel to the fluid flow direction.

8. A high-temperature fusible gas ball valve according to claim 1, characterized in that, The insulating valve cover assembly and the valve body assembly are connected by threads and an airtight seal is achieved by an O-ring.

9. A gas safety control system, characterized in that, It includes a high-temperature fusible gas ball valve as described in any one of claims 1-8, and is connected to a gas pipeline and a user terminal.

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