Fuel gas safety valve with over-temperature protection function

Abstract

The utility model discloses a fuel gas safety valve with over-temperature protection, which comprises a limiting seat connected in a temperature sensing cavity, and the limiting seat is provided with a guide channel; the sealing plug is used for opening and closing the temperature sensing cavity, the sealing plug comprises a sealing part and a connecting part extending outwards from the sealing part, and one end of the connecting part extends to the guide channel; the first elastic piece is arranged between the limiting seat and the sealing plug and has the movement trend of forcing the sealing plug to always move towards one side of the opening and closing opening; wherein a hot melt adhesive filling layer is arranged in a gap between the outer peripheral wall of the connecting part and the inner wall of the guide channel, connection between the sealing plug and the limiting seat is achieved through hot melt adhesive, and when the environment temperature exceeds the melting temperature of the hot melt adhesive, the sealing plug is pushed by the first elastic piece to move to block the opening and closing opening, and the sealing plug is connected with the limiting seat. The mechanical over-temperature protection structure is more effective and stable, the structure is simple, and the whole body can be disassembled and assembled.

Description

Technical Field

[0001] This application relates to the technical field of gas valves, and in particular to a gas safety valve. Background Technology

[0002] A gas safety valve is a device installed on a gas pipeline to cut off the gas supply. Currently, the most common gas safety valves on the market are gas ball valves. For example, the structure of a "double-sealed ball valve" disclosed in Chinese utility model patent with authorization announcement number CN212377339U is such that the valve stem is rotated by turning the handle, and the valve stem drives the ball to rotate in the valve body, thereby realizing the opening and closing of the valve body.

[0003] The aforementioned safety valves require manual operation to control the flow of gas in the pipeline. In the event of a sudden fire, they cannot automatically shut off the gas pipeline, which could lead to a safety accident. Utility Model Content

[0004] In order to automatically close the valve and cut off the gas pipeline when the ambient temperature is too high, this application provides a gas safety valve with over-temperature protection.

[0005] The gas safety valve with over-temperature protection provided in this application adopts the following technical solution:

[0006] A gas safety valve with over-temperature protection includes a valve body and a ball disposed within the valve body. The valve body includes an inlet section, an outlet section, and a temperature sensing chamber connecting the inlet section and the outlet section. The temperature sensing chamber has an opening and closing port. The valve body also includes an over-temperature protection component installed within the temperature sensing chamber. The over-temperature protection component includes:

[0007] A limiting seat is connected inside the temperature sensing cavity, and the limiting seat has a guide channel;

[0008] A sealing plug for opening and closing a temperature sensing cavity, the sealing plug comprising a sealing portion and a connecting portion extending outwardly from the sealing portion, one end of the connecting portion extending to a guide channel; and

[0009] The first elastic element is located between the limiting seat and the sealing plug, and has the tendency to force the sealing plug to always move toward the opening and closing side.

[0010] The gap between the outer peripheral wall of the connecting part and the inner wall of the guide channel is filled with a hot melt adhesive layer. When the temperature inside the temperature sensing cavity is greater than the melting temperature of the hot melt adhesive, the first elastic element can drive the sealing plug to move relative to the limiting seat and seal the opening and closing port.

[0011] By adopting the above technical solution, the sealing plug is initially connected to the limiting seat using a hot melt adhesive filling layer. When the ambient temperature rises, causing the temperature inside the temperature sensing cavity to rise, the hot melt adhesive will gradually reach its melting point, thereby gradually reducing the connection strength between the sealing plug and the limiting seat. When the ambient temperature reaches the melting temperature of the hot melt adhesive, the hot melt adhesive changes from solid to liquid. At this time, the sealing plug can be displaced relative to the limiting seat under the action of the first elastic element to seal the opening and closing port, thereby achieving the function of cutting off the temperature sensing cavity and cutting off the entire valve body. The safety valve can be closed without manual operation, which reduces safety hazards.

[0012] Preferably, the sealing part includes a sealing surface, and the outer edge of the opening and closing port has a stepped surface. When the sealing plug is sealed to the opening and closing port, the sealing surface abuts against the stepped surface.

[0013] By adopting the above technical solution, the sealing connection between the sealing plug and the opening / closing port is achieved by the mutual contact between the sealing surface and the stepped surface, which can quickly and effectively close the valve body and cut off the pipeline.

[0014] Preferably, the limiting seat includes a seat body, which is threadedly connected to the temperature sensing cavity.

[0015] By adopting the above technical solution, the threaded connection of the limit seat allows the entire over-temperature protection component to be disassembled and assembled with the valve body as a whole, improving manufacturing efficiency and enabling replacement for long-term use.

[0016] Preferably, it further includes an overcurrent protection mechanism, the overcurrent protection mechanism comprising:

[0017] A limiting bracket is connected inside the sphere;

[0018] The push rod is slidably connected to the limit bracket;

[0019] Sealing gasket, one end of the connecting rod; and

[0020] The second elastic element is located between the limiting bracket and the push rod, and has the tendency to force the sealing gasket to always have a displacement closer to the limiting bracket.

[0021] The sphere has a flow channel with a flow port. The flow protection mechanism is housed within the flow channel. The sealing gasket can be displaced within the flow channel and can be sealed to the flow port.

[0022] By adopting the above technical solution, when the gas in the pipeline passes through the valve body, it can act on the sealing gasket, causing it to tend to move towards the flow port side. The second elastic element can pull the sealing gasket to resist the driving force of the gas flow. When the gas flow rate in the pipeline suddenly increases and exceeds the elastic force of the second elastic element, the sealing gasket is pushed to the flow port side and seals with the flow port, thereby cutting off the conduction inside the valve body and achieving the pipeline cut-off function, realizing overcurrent protection.

[0023] Preferably, the limiting bracket includes:

[0024] Main body; the main body has a guide hole, and one end of the push rod can extend into the guide hole; and

[0025] Several frames are evenly distributed around the outer perimeter wall of the main body;

[0026] The flow channel is also provided with a limiting groove, and one end of the frame has a hook that is engaged in the limiting groove.

[0027] By adopting the above technical solution, when the limiting bracket is installed inside the sphere, it can be quickly fixed by hooking into the limiting groove, making the operation convenient.

[0028] Preferably, the push rod includes a boss at the end, the main body has a mounting groove with a connecting guide hole at one end, one end of the second elastic member abuts against the boss, and the other end of the second elastic member abuts against the bottom of the mounting groove.

[0029] By adopting the above technical solution, the two ends of the second elastic element abut against the boss and the mounting groove respectively to achieve the positioning of the push rod.

[0030] Preferably, the push rod also has an annular groove at its end, and the sealing gasket is engaged in the annular groove.

[0031] By adopting the above technical solution, the sealing gasket is connected to the push rod in a snap-fit ​​manner, which makes the connection more stable. It also allows the entire overcurrent protection mechanism to be connected to the ball as a whole, achieving the effect of disassembly and assembly and improving efficiency.

[0032] Preferably, it further includes an operating mechanism for driving the ball to rotate within the valve body, the operating mechanism comprising:

[0033] A valve stem, one end of which is connected to a ball;

[0034] The locking plate can undergo axial displacement relative to the valve stem;

[0035] Knob, connected to the locking plate; and

[0036] The third elastic element is connected between the valve stem and the locking plate, and has the tendency to force the locking plate to always have a displacement away from the valve stem.

[0037] The valve stem has a notch, and the locking plate can be locked inside the notch.

[0038] By adopting the above technical solution, the operating mechanism is connected to the ball to achieve the rotation of the ball and thus control the manual opening and closing operation of the entire safety valve. The setting of the third elastic element ensures that there is a certain gap between the locking plate and the valve stem. When driving the valve stem, the knob needs to be pressed to overcome the elastic force of the third elastic element so that the locking plate connects with the valve stem, thereby providing a protection against misoperation.

[0039] Preferably, the operating mechanism further includes a limiting plate connected to the valve body. The limiting plate includes at least one stop. The locking plate has a maximum rotation position and a minimum rotation position when rotating relative to the valve body. When the locking plate is in the maximum rotation position or the minimum rotation position, the locking plate abuts against the stop.

[0040] By adopting the above technical solution, the setting of the limiting plate limits the rotation angle of the ball driven by the entire valve stem, and the maximum rotation range is limited by the contact between the locking plate and the two ends of the stop.

[0041] Preferably, the valve body has a limiting port, the limiting plate includes an extension block that is locked in the limiting port, and the valve body is also locked with a retaining spring that abuts against the limiting plate.

[0042] By adopting the above technical solution, the connection stability of the retaining ring and the valve body can be further improved.

[0043] In summary, this application includes at least one of the following beneficial technical effects:

[0044] 1. The connection between the sealing plug and the limiting seat is achieved using hot melt adhesive. When the ambient temperature exceeds the melting temperature of the hot melt adhesive, the sealing plug is displaced under the push of the first elastic element to seal the opening and closing port. The mechanical over-temperature protection structure is more effective and stable, and the structure is simple and can be disassembled.

[0045] 2. By combining the structural design of the overcurrent protection mechanism and the operating mechanism, the overcurrent cut-off and prevention of accidental opening and closing of the safety valve are achieved, thereby improving the overall functionality and safety of the safety valve. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of the structure of a gas safety valve;

[0047] Figure 2 This is a cross-sectional view of a gas safety valve;

[0048] Figure 3 The diagram shows the over-temperature protection mechanism and the over-current protection mechanism of the gas safety valve.

[0049] Figure 4 This diagram shows the main operating mechanism of a gas safety valve from one perspective.

[0050] Figure 5 This is a schematic diagram of the operating mechanism of a gas safety valve from another perspective.

[0051] Explanation of reference numerals in the attached drawings: 1. Valve body; 11. Inlet section; 111. Inlet port; 112. Outlet port; 12. Outlet section; 13. Temperature sensing chamber; 131. Opening / closing port; 132. Stepped surface; 14. Limiting port; 2. Ball; 21. Flow passage; 211. Flow port; 212. Flow step; 213. Limiting groove; 3. Limiting seat; 31. Guide post; 311. Guide passage; 32. Sealing body; 33. Hot melt adhesive filling layer; 4. Sealing plug; 41. Sealing part; 411. Sealing surface; 42. Connecting part; 5. First 6. Elastic element; 61. Limiting bracket; 62. Main body; 62. Frame; 621. Hook; 63. Guide hole; 631. Mounting groove; 7. Push rod; 71. Rod body; 711. Ring groove; 72. Boss; 8. Second elastic element; 9. Sealing gasket; 10. Operating mechanism; 101. Valve stem; 1011. Cutout; 102. Locking plate; 1021. Rotating plate; 1022. Connecting plate; 103. Knob; 104. Third elastic element; 105. Limiting plate; 1051. Stop; 1052. Extension block; 106. Snap ring. Detailed Implementation

[0052] The present application will be further described in detail below with reference to the accompanying drawings.

[0053] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0055] Figure 1 and Figure 2 A gas safety valve structure with over-temperature protection is shown, including a valve body 1, an over-temperature protection mechanism, an over-current protection mechanism, and an operating mechanism 10. The over-temperature protection mechanism and the over-current protection mechanism are installed inside the valve body 1, while the operating mechanism 10 is installed outside the valve body 1. The valve body 1 has a three-way structure, including an inlet section 11 and an outlet section 12. The outlet section 12 is detachably connected. The inlet section 11 has an inlet port 111 connected to an external pipeline, and the outlet section 12 has an outlet port 112 also connected to an external pipeline.

[0056] Combination Figure 3 The valve body 1 also has a temperature sensing chamber 13 inside, connecting the air inlet section 11 and the air outlet section 12. The over-temperature protection mechanism is located in the temperature sensing chamber 13, which is located on the side of the temperature sensing chamber 13 closest to the air inlet 111. The over-temperature protection mechanism includes a limiting seat 3, a sealing plug 4, and a first elastic element 5. The limiting seat 3 includes an integral guide post 31 and a seat body 32 surrounding the guide post 31. There is a certain gap between the seat body 32 and the guide post 31. The outer surface of the seat body 32 is provided with threads, which can be connected to the valve body 1 through a threaded connection.

[0057] The sealing plug 4 protects the integrated sealing part 41 and connecting part 42. The connecting part 42 extends vertically outward from the end face of the sealing part 41, and the sealing part 41 and the connecting part 42 are arranged in a stepped manner. The guide post 31 has a through guide channel 311 inside. One end of the connecting part 42 extends into the guide channel 311. There is a gap between the inner wall of the guide channel 311 and the outer wall of the connecting part 42. Hot melt adhesive is filled in the gap. After the hot melt adhesive solidifies, it forms a hot melt adhesive filling layer 33. The connection between the connecting part 42 and the guide post 31 is achieved through the hot melt adhesive filling layer 33.

[0058] The first elastic element 5 is a compression spring, which is sleeved on the guide post 31, with one end abutting against the seat 32 and the other end abutting against the sealing part 41. The first elastic element 5 can force the sealing plug 4 to always have a tendency to move away from the limiting seat 3.

[0059] The end of the temperature sensing cavity away from the air inlet 111 is the opening and closing port 131. The opening and closing port 131 has a stepped surface 132 at its outer edge. The sealing part 41 has a sealing surface 411 at the end face position. The sealing surface 411 can abut against the stepped surface 132 to achieve a sealing connection with the opening and closing port 131 and close the opening and closing port 131.

[0060] The overcurrent protection mechanism is connected to the sphere 2. Furthermore, the sphere 2 has an internal overcurrent channel 21 connecting the temperature sensing cavity 13 and the air outlet 112. The overcurrent protection mechanism is installed within the overcurrent channel 21. The overcurrent protection mechanism includes a limiting bracket 6, a push rod 7, a sealing gasket 9, and a second elastic element 8. The limiting bracket 6 includes a main body 61 and several frames 62 connected to the main body 61. The frames 62 are evenly distributed circumferentially on the outer periphery of the main body 61. Each frame 62 has a hook 621 at its end. A limiting groove 213 is also provided within the overcurrent channel 21. The limiting groove 213 is circumferentially open, and the hook 621 engages with the limiting groove 213, thereby achieving the connection between the limiting bracket 6 and the sphere 2.

[0061] The push rod 7 is generally cylindrical, comprising an integral rod body 71 and a boss 72 at the end. The diameter of the boss 72 is larger than the diameter of the rod body 71, resulting in a stepped shape. The main body 61 has a through guide hole 63, within which the rod body 71 can slide axially. The main body 61 also has a mounting groove 631 at its end that communicates with the guide hole 63. A third elastic member 104 is installed in the guide groove, with one end of the third elastic member 104 abutting against the boss 72 and the other end abutting against the bottom of the mounting groove 631.

[0062] A groove 711 is formed at the end of the push rod 7 away from the boss 72. A mounting hole is formed in the middle of the sealing gasket 9, which engages with the groove 711 to connect the sealing gasket 9 to the push rod 7. The flow passage 21 has a flow port 211 on the side near the outlet 112. A flow step 212 is provided at the outer edge of the flow port 211. The sealing gasket 9 can abut against the flow step 212 to close the flow port 211 and cut off the flow passage 21. Simultaneously, the third elastic element 104 is a compression spring that forces the sealing gasket 9 to maintain a tendency to move closer to the limiting bracket 6.

[0063] Combination Figure 4 and Figure 5 The operating mechanism 10 is used to drive the ball 2 to rotate within the valve body 1, thereby controlling the opening and closing of the entire safety valve. Specifically, the operating mechanism 10 includes a valve stem 101, a locking plate 102, a knob 103, and a third elastic element 104. One end of the valve stem 101 extends into the valve body 1 and connects to the outer wall of the ball 2, while the other end of the valve body 1 has a notch 1011. The locking plate 102 includes an integral rotating plate 1021 and a connecting plate 1022. The rotating plate 1021 and the connecting plate 1022 are arranged perpendicularly. The rotating plate 1021 can be disposed within the notch 1011 to achieve connection with the valve body 1, and the connecting plate 1022 is connected to the knob 103.

[0064] The third elastic element 104 is also a compression spring, which is sleeved on the valve body 1. One end abuts against the valve body 1, and the other end abuts against the rotating plate 1021. The third elastic element 104 forces the locking plate 102 to always have a tendency to move away from the valve stem 101, and makes the locking plate 102 and the valve stem 101 have a certain clearance distance.

[0065] The operating mechanism 10 also includes a limiting piece 105 and a retaining ring 106 for fixing the limiting piece 105. The limiting piece 105 includes two extension blocks 1052 disposed on the outer peripheral wall, and the valve body 1 has a limiting opening 14 for the extension blocks 1052 to be engaged. The limiting piece 105 also includes at least one stop portion 1051 extending toward one side of the valve body 1. In this embodiment, there are two stops 1051, which are spaced apart in the circumferential direction. The limiting piece 105 is disposed above the locking piece 102, and the locking piece 102 can rotate relative to the limiting piece 105. The rotating piece 1021 has a maximum rotation position and a minimum rotation position relative to the valve body 1. When the rotating piece 1021 is in the maximum rotation position or the minimum rotation position, the rotating piece 1021 abuts against the stop portion 1051, and the two stops 1051 limit the rotation angle of the rotating piece 1021. The retaining ring 106 is engaged within the valve body 1 and abuts against the limiting piece 105, thereby restricting the axial movement of the limiting piece 105.

[0066] When the ambient temperature rises, if the temperature inside the temperature sensing chamber 13 exceeds the melting temperature of the hot melt adhesive, the hot melt adhesive filling layer 33 melts. At this time, the first elastic element 5 releases its elastic potential energy, pushing the sealing plug 4 toward the opening / closing port 131. Finally, the sealing surface 411 abuts against the step surface 132, cutting off the connection between the air inlet section 11 and the air outlet section 12, thus achieving an automatic shut-off effect.

[0067] When the gas flow rate in the gas pipeline increases and overcomes the elastic force of the second elastic element 8, the push rod 7 slides relative to the limiting bracket 6, and the sealing gasket 9 moves toward the flow port 211 until the flow port 211 is closed, thus cutting off the connection between the gas inlet section 11 and the gas outlet section 12, achieving an automatic cut-off effect.

[0068] When it is necessary to open, close or adjust the opening of the safety valve, press the knob 103 to move it toward the valve body 1. The locking plate 102 gradually approaches the valve body 1 and eventually connects with the valve body 1, at which point the valve body 1 can be rotated. When the knob 103 is released, the locking plate 102 is lifted by the action of the third elastic element 104 and disengages from the valve stem 101, thus achieving the effect of accidental operation.

[0069] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A gas safety valve with over-temperature protection, comprising a valve body (1) and a ball (2) disposed within the valve body (1), wherein the valve body (1) comprises an inlet section (11), an outlet section (12), and a temperature sensing chamber (13) connecting the inlet section (11) and the outlet section (12), wherein the temperature sensing chamber (13) has an opening / closing port (131); characterized in that, It also includes an over-temperature protection component installed in the temperature sensing cavity (13), the over-temperature protection component comprising: The limiting seat (3) is connected to the temperature sensing cavity (13), and the limiting seat (3) has a guide channel (311). A sealing plug (4) is used to open and close the temperature sensing cavity (13). The sealing plug (4) includes a sealing part (41) and a connecting part (42) extending outward from the sealing part (41). One end of the connecting part (42) extends to the guide channel (311). The first elastic element (5) is located between the limiting seat (3) and the sealing plug (4), and has the tendency to force the sealing plug (4) to always move towards the opening and closing port (131). Among them, a hot melt adhesive filling layer (33) is provided at the gap between the outer peripheral wall of the connecting part (42) and the inner wall of the guide channel (311). When the temperature in the temperature sensing cavity (13) is greater than the melting temperature of the hot melt adhesive, the first elastic element (5) can drive the sealing plug (4) to move relative to the limiting seat (3) and seal it with the opening and closing port (131).

2. A gas safety valve with over-temperature protection according to claim 1, characterized in that, The sealing part (41) includes a sealing surface (411), and the outer edge of the opening and closing port (131) has a stepped surface (132). When the sealing plug (4) is sealed to the opening and closing port (131), the sealing surface (411) abuts against the stepped surface (132).

3. A gas safety valve with over-temperature protection according to claim 1, characterized in that, The limiting seat (3) includes a seat body (32), which is threadedly connected to the temperature sensing cavity (13).

4. A gas safety valve with over-temperature protection according to claim 1, characterized in that, It also includes an overcurrent protection mechanism, which includes: The limiting bracket (6) is connected inside the sphere (2); The push rod (7) is slidably connected to the limiting bracket (6); Sealing gasket (9), one end of connecting push rod (7); and The second elastic element (8) is located between the limiting bracket (6) and the push rod (7), and has the tendency to force the sealing gasket (9) to always have a displacement close to the side of the limiting bracket (6); The sphere (2) has an overflow channel (21) inside, the overflow channel (21) has an overflow port (211), the overflow protection mechanism is housed in the overflow channel (21), and the sealing gasket (9) can be displaced in the overflow channel (21) and can be sealed to the overflow port (211).

5. A gas safety valve with over-temperature protection according to claim 4, characterized in that, The limiting bracket (6) includes: Main body (61); the main body (61) has a guide hole (63), one end of the push rod (7) can extend into the guide hole (63); and Several frames (62) are evenly distributed around the outer periphery of the main body (61); The flow channel (21) is provided with a limiting groove (213), and one end of the frame (62) has a hook (621) that is engaged in the limiting groove (213).

6. A gas safety valve with over-temperature protection according to claim 5, characterized in that, The push rod (7) includes a boss (72) at the end. The main body (61) has a mounting groove (631) with a connecting guide hole (63) at one end. One end of the second elastic member (8) abuts against the boss (72), and the other end of the second elastic member (8) abuts against the bottom of the mounting groove (631).

7. A gas safety valve with over-temperature protection according to claim 4, characterized in that, The push rod (7) also has an annular groove (711) at its end, and the sealing gasket (9) is fitted into the annular groove (711).

8. A gas safety valve with over-temperature protection according to claim 1, characterized in that, It also includes an operating mechanism (10) for driving the ball (2) to rotate within the valve body (1), the operating mechanism (10) comprising: A valve stem (101), one end of which is connected to a ball (2); The locking plate (102) can be axially displaced relative to the valve stem (101); Knob (103), connected to the locking plate (102); and The third elastic element (104) is connected between the valve stem (101) and the locking plate (102), and has the tendency to force the locking plate (102) to always have a displacement away from the valve stem (101); The valve stem (101) has a notch (1011), and the locking piece (102) can be locked in the notch (1011).

9. A gas safety valve with over-temperature protection according to claim 8, characterized in that, The operating mechanism (10) further includes a limiting plate (105), which is connected to the valve body (1). The limiting plate (105) includes at least one stop (1051). The locking plate (102) has a maximum rotation position and a minimum rotation position when rotating relative to the valve body (1). When the locking plate (102) is in the maximum rotation position or the minimum rotation position, the locking plate (102) abuts against the stop (1051).

10. A gas safety valve with over-temperature protection according to claim 9, characterized in that, The valve body (1) has a limiting port (14), and the limiting piece (105) includes an extension block (1052) that is locked in the limiting port (14). The valve body (1) is also locked with a retaining spring (106), and the retaining spring (106) abuts against the limiting piece (105).

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