Gas emergency shut-off valve

Abstract

This utility model discloses a gas emergency shut-off valve, including a valve body, a valve stem, a closing spring, and a shut-off assembly. A connecting seat is installed on the top of the valve body. The shut-off assembly includes a locking groove and a release ramp on the side wall of the valve stem, a shut-off solenoid valve installed on the connecting seat, and a shut-off knob linked to the upper end of the valve stem. The shut-off solenoid valve has an elastic valve core that passes through the connecting seat and is engaged with the locking groove. When the shut-off knob drives the valve stem to rotate, the elastic valve core slides relative to the release ramp on the valve stem, forcibly pushing out the elastic valve core engaged in the locking groove, thereby releasing the limiting lock on the valve stem. The valve stem then immediately moves down to close the valve port under the action of the closing spring. The gas emergency shut-off valve using this technical solution has both electromagnetic rapid shut-off and manual rapid shut-off capabilities, greatly improving the shut-off reliability of the gas system in emergency situations and reducing the risk of leakage.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and more specifically to a gas emergency shut-off valve. Background Technology

[0002] Natural gas is a commonly used energy source. Its combustibility allows it to release heat for human use, and therefore, the safety requirements for its use are very high. Emergency gas shut-off valves are safety devices in gas pipeline engineering, used in the gas transmission and distribution field. They can cut off the pipeline in case of abnormalities in gas transmission, ensuring the safety of gas delivery and use.

[0003] Existing gas shut-off valves can be divided into electromagnetic shut-off valves and manual shut-off valves according to their operation methods. Electromagnetic shut-off valves have the advantages of fast shut-off speed and low leakage, but they must rely on electricity to operate. If there is a power outage or a problem with the electromagnetic coil, they cannot shut off in a short time, causing the shut-off valve to fail to operate. On the other hand, manual shut-off valves require manual closing, have a slow shut-off speed, and are prone to untimely closing, posing a safety hazard of gas leakage. Therefore, in order to improve the safety and maintainability of the entire gas supply system, and to meet the safety requirements of automation and rapid response, as well as the requirement of reliable backup shut-off protection, the development and design of a simple, reliable gas shut-off valve that integrates manual and automatic functions has been a long-standing technical challenge in this field. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the safety hazards of single-mode valves in the prior art, thereby providing a simple and reliable gas shut-off valve with electromagnetic and manual rapid shut-off capabilities, reducing the risk of leakage.

[0005] To achieve the above objectives, this utility model provides a gas emergency shut-off valve, comprising a valve body, a valve stem, a closing spring, and a shut-off assembly. A connecting seat is mounted on the top of the valve body. The valve stem moves through the valve body and the connecting seat, and is provided with a sealing disc that mates with the valve port. The closing spring is disposed between the sealing disc and the valve body. The shut-off assembly includes:

[0006] A locking groove is provided on the side wall of the valve stem;

[0007] A shut-off solenoid valve is installed on a connector and has an elastic valve core that passes through the connector and is engaged in a locking groove. The elastic valve core forms a limiting engagement with the valve stem by being locked in the locking groove, and moves out of the locking groove under the electromagnetic force generated by the energization of the shut-off solenoid valve.

[0008] A release ramp is provided on the side wall of the valve stem and extends to the upper side of the locking groove;

[0009] A cut-off knob is linked to the upper end of the valve stem. When the cut-off knob drives the valve stem to rotate, the elastic valve core slides into contact with the release ramp to release the limiting lock of the elastic valve core on the valve stem.

[0010] As a preferred embodiment, the connecting seat has a guide cavity extending along the valve stem axial direction, the valve stem is movably disposed in the guide cavity, and the movement direction of the elastic valve core is perpendicular to the movement direction of the valve stem.

[0011] As a preferred embodiment, the shut-off solenoid valve includes a coil structure mounted on the side wall of the connecting seat, and a stationary iron core and an elastic valve core disposed in the central cavity of the coil structure. The side wall of the connecting seat is provided with a guide hole through which the elastic valve core can pass, and the guide hole communicates with the guide cavity radially along the valve stem.

[0012] As a preferred embodiment, the elastic valve core includes a movable valve core disposed in the coil structure relative to the stationary iron core, and a valve core spring disposed between the movable valve core and the stationary iron core. Under the action of the valve core spring, the movable valve core forms a limiting engagement with the locking groove on the valve stem through a guide hole.

[0013] As a preferred embodiment, the coil structure includes a mounting guide tube disposed in its central cavity and opposite to the guide hole. One end of the mounting guide tube extends out of the coil structure and is fixed in the mounting groove on the side wall of the connecting seat by a locking member. The elastic valve core is movably disposed in the mounting guide tube, and the stationary iron core is fixedly connected to the other end of the mounting guide tube.

[0014] As a preferred embodiment, the locking groove is an annular groove arranged circumferentially on the side wall of the valve stem.

[0015] As a preferred embodiment, the cut-off knob is movably mounted on the connecting seat and has a reset state that allows the valve stem to be pulled upward to open the valve port.

[0016] As a preferred embodiment, a pressure balancing structure is provided between the valve stem and the sealing disc, the pressure balancing structure comprising:

[0017] The limiting assembly includes a limiting boss and a limiting retaining ring disposed opposite to each other on the valve stem. The sealing disc is sleeved on the valve stem and is movable between the limiting boss and the limiting retaining ring. An active gap is left between the sealing disc and the valve stem.

[0018] A balance sealing ring is embedded in the limiting boss and makes contact with the upper side of the sealing disc by compression.

[0019] A balance spring is sleeved on the lower end of the valve stem and abuts against the lower side of the sealing disc;

[0020] When the valve stem is pulled upward, it causes the balance sealing ring to move away from the sealing disc, so that the movable gap connects the air inlet chamber and the air outlet chamber located at both ends of the valve port.

[0021] As a preferred embodiment, a spring stop is provided at the lower end of the valve stem, and the two ends of the balance spring abut against the elastic stop and the sealing disc respectively. The lower side of the sealing disc is provided with a positioning groove for positioning and connecting the balance spring.

[0022] As a preferred embodiment, the top of the connecting seat is provided with an upper blocking boss around the upper port of the guide cavity, and the valve stem is provided with a lower blocking boss opposite to the blocking boss. At least one valve stem sealing ring is fitted on the valve stem to press against the inner wall of the guide cavity.

[0023] The technical solution of this utility model has the following advantages compared with the prior art:

[0024] 1. In the gas emergency shut-off valve provided by this utility model, under normal power conditions and with the electromagnetic coil intact, as long as the shut-off solenoid valve is energized, it will generate electromagnetic force to drive the elastic valve core to instantly exit the locking groove, causing the valve stem to move down immediately under the action of the closing spring and close the valve port, thus realizing the rapid shut-off function of the solenoid valve; and when a power failure or electromagnetic coil failure occurs, the operator only needs to turn the shut-off knob to rotate the valve stem by a certain angle, and the release ramp on the valve stem will slide relative to the elastic valve core, using the wedge-shaped action of the ramp to force the elastic valve core stuck in the locking groove out. Once the elastic valve core is disengaged from the locking groove, it will also release. The valve stem is limited, meaning that the valve stem immediately moves down to close the valve under the action of the closing spring. This ensures that even in the event of power failure or electromagnetic component malfunction, the gas can be reliably and quickly manually shut off. The core of achieving rapid manual release is the combination of spring energy storage and release ramp design, which eliminates the need for additional complex linkage mechanisms, making it lightweight, labor-saving, and highly integrated. The gas emergency shut-off valve designed with this technical solution has both electromagnetic rapid shut-off and manual rapid shut-off capabilities, effectively solving the main safety hazards of traditional single-mode valves, greatly improving the reliability of gas system shut-off in emergency situations, reducing leakage and its duration, and lowering leakage risk.

[0025] 2. In the gas emergency shut-off valve provided by this utility model, the manual operation (rotating the knob) does not directly close the valve. Instead, the valve stem is unlocked by the release ramp of the mechanical structure cooperating with the elastic valve core. After unlocking, the valve stem's closing action is completed instantly by the closing spring. Therefore, the manual shut-off speed is greatly improved, much faster than traditional manual valves. During the entire operation, the operator only needs to apply a small rotational force, making the operation easier, faster, and more reliable. This significantly reduces the risk of delayed shut-off due to difficult or time-consuming operation. This structural design highly integrates the manual release mechanism with the automatic electromagnetic mechanism, realizing a reliable operating logic of automatic rapid shut-off when the power is normal and manual rapid unlocking when the power is abnormal. This helps to cut off the gas source more quickly in emergency situations.

[0026] 3. In the gas emergency shut-off valve provided by this utility model, the guide cavity is connected to the valve stem radially by the guide hole, so that the movement direction of the elastic valve core is perpendicular to the valve stem axis. The elastic valve core is composed of a moving valve core and a valve core spring. The valve core spring continuously pushes the moving valve core through the guide hole and into the locking groove of the valve stem to form a mechanical limit. This locking groove is an annular groove formed on the side wall of the valve stem, so that the moving valve core is locked into the annular groove of the side wall of the valve stem to form a circumferentially uniform mechanical constraint, avoiding limit failure caused by single-point force. Even if the valve stem is slightly displaced by the gas pressure fluctuation, the annular groove and the moving valve core can still maintain stable limit.

[0027] 4. In the gas emergency shut-off valve provided by this utility model, when the valve needs to be opened, the valve stem is first pulled upward to overcome the preload of the balance spring, causing the valve stem to drive the limit ring to abut against the lower side of the sealing disc, and causing the balance sealing ring to disengage from the sealing disc, thereby opening the movable gap. This balance sealing ring only briefly disengages from the sealing disc during the pressure balance phase, and remains in close contact during normal closure. At this time, the inlet chamber and outlet chamber are connected through the movable gap formed between the valve stem and the sealing disc. The high-pressure side gas flows to the low-pressure side through the movable gap until the gas pressure on both sides is equal, and the pressure applied to the valve port sealing cover cancels each other out. Only then can the valve stem be pulled upward. At this time, the valve stem only needs to overcome the resistance of the closing spring to open the valve port, avoiding the situation where the sealing cover is too tightly pressed due to the high pressure on one side of the traditional valve. This technical solution eliminates the resistance of the gas pressure difference to opening the valve by designing a pressure balance structure, greatly reducing the opening operation force, avoiding the risk of valve jamming, and improving operational safety and response speed. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below.

[0029] Figure 1 This is a schematic diagram of the gas emergency shut-off valve of this utility model in the open state;

[0030] Figure 2 for Figure 1 The diagram shows a gas emergency shut-off valve that is closed by electromagnetic shut-off.

[0031] Figure 3 for Figure 1 The diagram shows the structure of the gas emergency shut-off valve that can be manually shut off.

[0032] Figure 4 This is a schematic diagram of the installation structure of the shut-off solenoid valve of this utility model;

[0033] Figure 5 This is a schematic diagram of the pressure balance structure of this utility model.

[0034] Explanation of reference numerals in the attached drawings: 1. Valve body; 10. Valve port; 11. Connecting seat; 12. Upper blocking boss; 2. Valve stem; 21. Sealing disc; 22. Lower blocking boss; 3. Closing spring; 4. Shut-off solenoid valve; 41. Elastic valve core; 411. Moving valve core; 412. Valve core spring; 42. Coil structure; 43. Stationary iron core; 44. Mounting guide tube; 45. Locking element; 5. Locking groove; 6. Shut-off knob; 7. Release ramp; 81. Limiting boss; 82. Limiting retaining ring; 83. Balance spring; 84. Balance sealing ring; 85. Spring stop; 86. Positioning protrusion; 87. Positioning groove; 9. Valve stem sealing ring. Detailed Implementation

[0035] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0036] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0038] Example

[0039] This embodiment provides, as follows: Figure 1-5 The gas emergency shut-off valve shown includes a valve body 1, a valve stem 2, a closing spring 3, and a shut-off assembly. A connecting seat 11 is mounted on the top of the valve body 1. The valve stem 2 moves axially through the valve body 1 and passes between the connecting seat 11, and is provided with a sealing disc 21 that mates with the valve port 10. The closing spring 3 is disposed between the sealing disc and the valve body 1. The shut-off assembly includes:

[0040] Locking groove 5 is provided on the side wall of valve stem 2;

[0041] The shut-off solenoid valve 4 is installed on the connecting seat 11 and has an elastic valve core 41 that passes through the connecting seat 11 and is connected to the locking groove 5. The elastic valve core 41 forms a limiting engagement with the valve stem 2 by being stuck in the locking groove 5, and moves out of the locking groove 5 under the electromagnetic force generated by the energization of the shut-off solenoid valve 4.

[0042] Release ramp 7 is provided on the side wall of the valve stem 2 and extends to the upper side of the locking groove 5;

[0043] The cut-off knob 6 is linked to the upper end of the valve stem 2. When the cut-off knob 6 drives the valve stem 2 to rotate, the elastic valve core 41 slides into contact with the release inclined surface 7 to release the limiting lock of the elastic valve core 41 on the valve stem 2.

[0044] When the above-mentioned emergency shut-off valve is in use, the shut-off knob 6 is used to pull the valve stem 2 upward. The elastic valve core 41 of the shut-off solenoid valve 4 is embedded in the locking groove 5 of the valve stem 2 under the action of the spring, and the valve stem is locked, so that the sealing disc 21 on the valve stem 2 opens the valve port 10 of the gas passage, and the gas is delivered normally. When the gas delivery is abnormal, the shut-off solenoid valve 4 is energized to generate electromagnetic force to attract the elastic valve core 41, so that the elastic valve core 41 is disengaged from the locking groove 5 of the valve stem and releases the control of the valve stem 2. The valve stem 2 is then quickly moved downward under the action of the closing spring 3, and the sealing disc 21 closes the valve port 10 to cut off the gas passage, thereby ensuring gas safety.

[0045] The above-described implementation method is the core technical solution of this embodiment. Under normal power conditions and with the electromagnetic coil intact, as long as the shut-off solenoid valve 4 is energized, the electromagnetic force drives the elastic valve core 41 to instantly exit the locking groove 5. This causes the valve stem 2, under the action of the closing spring 3, to immediately move the sealing disc 21 downwards and close the valve port 10, achieving the rapid shut-off function of the solenoid valve. Furthermore, in the event of a power outage or electromagnetic coil failure, the operator only needs to rotate the shut-off knob 6 to rotate the valve stem 2 by a certain angle. The release ramp 7 on the valve stem 2 slides relative to the elastic valve core 41, and the wedge-shaped action of the ramp forces the elastic valve core 41, which is stuck in the locking groove 5, out of the lock. Once the elastic valve core... 41. Disengaging from the locking groove 5 also releases the limit on the valve stem 2, meaning that the valve stem 2 immediately moves down to close the valve under the action of the closing spring 3. This ensures that even in the event of power failure or electromagnetic component malfunction, the gas can be reliably and quickly manually shut off. The combination of spring energy storage and release ramp 7 is the core of achieving rapid manual release, eliminating the need for additional complex linkage mechanisms, making it lightweight, labor-saving, and highly integrated. The gas emergency shut-off valve designed using this technical solution has both electromagnetic rapid shut-off and manual rapid shut-off capabilities, effectively solving the main safety hazards of traditional single-mode valves, greatly improving the shut-off reliability of the gas system in emergency situations, reducing leakage and duration, and lowering leakage risk.

[0046] The manual operation (rotating the knob) designed in this embodiment does not directly close the valve. Instead, the release ramp 7 of the mechanical structure cooperates with the elastic valve core 41 to release the lock on the valve stem 2. After the lock is released, the closing action of the valve stem 2 is completed instantly by the closing spring 3. Therefore, the manual shut-off speed is greatly improved, much faster than that of traditional manual valves. During the entire operation, the operator only needs to apply a small rotational force, making the operation easier, faster, and more reliable. This significantly reduces the risk of untimely shut-off due to difficult or time-consuming operation. This structural design highly integrates the manual release mechanism with the automatic electromagnetic mechanism, realizing a reliable operating logic of automatic and rapid shut-off when the power is normal and manual and rapid unlocking when the power is abnormal. This helps to cut off the gas source more quickly in emergency situations.

[0047] The following is combined Figure 2-5 The specific configuration of the shut-off solenoid valve and the valve stem is described in detail below:

[0048] The connecting seat 11 has a guide cavity extending axially along the valve stem 2. The valve stem 2 is movably disposed in the guide cavity. The moving direction of the elastic valve core 41 is perpendicular to the moving direction of the valve stem 2. The shut-off solenoid valve 4 includes a coil structure 42 mounted on the side wall of the connecting seat 11, and a stationary iron core 43 and an elastic valve core 41 disposed in the central cavity of the coil structure 42. The side wall of the connecting seat 11 is provided with a guide hole through which the elastic valve core 41 can pass. The guide hole communicates with the guide cavity radially along the valve stem 2. More preferably, the elastic valve core 41 includes a moving valve core 411 movably disposed in the coil structure 42 relative to the stationary iron core 43, and a valve core spring 412 disposed between the moving valve core 411 and the stationary iron core 43. Under the action of the valve core spring 412, the moving valve core 411 forms a limiting fit with the locking groove 5 on the valve stem 2 through the guide hole. This structural design, based on the elastic valve core 41 consisting of a moving valve core 411 and a valve core spring 412, utilizes the valve core spring 412 to continuously push the moving valve core 411 through the guide hole and engage in the locking groove 5 of the valve stem 2 to form a mechanical limit. This locking groove 5 is an annular groove arranged circumferentially on the side wall of the valve stem 2, allowing the moving valve core 411 to engage in the annular groove of the valve stem side wall to form a uniform circumferential mechanical constraint, avoiding limit failure caused by single-point force. Even if the valve stem 2 is slightly displaced by gas pressure fluctuations, the annular groove can still maintain stable limit, with reliability superior to traditional groove structures. When the coil structure is energized, this structural design generates an electromagnetic force that attracts the moving valve core 411 to move towards the stationary iron core 43, causing the moving valve core 411 to overcome the elastic force of the valve core spring 412 and exit the locking groove 5. At this time, the valve stem 2 quickly moves down under the action of the closing spring 3 to cut off the gas, with a fast response time, meeting the timeliness requirements of emergency cut-off.

[0049] refer to Figure 4The coil structure 42 includes a mounting guide 44 disposed in its central cavity and opposite to the guide hole. One end of the mounting guide 44 extends out of the coil structure 42 and is fixed in the mounting groove on the side wall of the connecting seat 11 by a locking member 45. The elastic valve core 41 is movably disposed in the mounting guide 44, and the stationary iron core 43 is fixedly connected to the other end of the mounting guide 44. The stationary iron core 43 is fixedly connected to the mounting bracket of the coil structure 42 by a nut. With this structure, the mounting guide 44 serves as the moving track of the elastic valve core 41. Its position relative to the guide hole ensures that the moving direction of the elastic valve core 41 is strictly perpendicular to the valve stem axis, allowing the elastic valve core 41 to move precisely with the guide hole. The locking groove on the valve stem 2 enables limiting engagement or disengagement, avoiding problems such as jamming and limit failure caused by deviation of the movement trajectory, thus improving the action accuracy and reliability of the shut-off solenoid valve 4. When installing the coil structure, one end of the installation guide tube 44 is fixed in the installation groove on the side wall of the connecting seat 11 by the locking member 45. Specifically, the locking member 45 can preferably be a locking nut. One end of the installation guide tube 44 is designed to be flipped outward so as to better cooperate with the locking nut to achieve installation and fixation. This fixing method makes the coil structure 42 and the connecting seat 11 fixedly connected, which can effectively prevent the coil structure 42 from shaking or displacing during the operation of the solenoid valve, ensuring that the shut-off solenoid valve 4 can reliably realize the locking and releasing function of the valve stem 2.

[0050] In this embodiment, the shut-off knob 6 is movably sleeved on the connecting seat 11 and has a reset state that pulls the valve stem 2 upward to open the valve port 10. During the process of the valve stem 2 being pulled upward to reset, when the locking groove 5 is aligned with the guide hole, the moving valve core 411 of the shut-off solenoid valve 4 is embedded in the locking groove 5 under the action of the spring, which limits and jams the valve stem 2. The valve port 10 is opened through the sealing disc 21 of the valve stem 2, thereby realizing the reset and opening of the shut-off valve. In order to avoid the inlet pressure pressing down the sealing cover at the valve port and increasing the downward pressure, which would make it difficult to pull the valve port upward, a pressure balance structure is provided between the valve stem 2 and the sealing disc 21.

[0051] As a preferred embodiment, such as Figure 3-4As shown, the pressure balancing structure includes: a limiting component, a balancing sealing ring 84, and a balancing spring 83. The limiting component includes a limiting boss 81 and a limiting retaining ring 82 disposed opposite to each other on the valve stem 2. The sealing disc 21 is sleeved on the valve stem 2 and movable between the limiting boss 81 and the limiting retaining ring 82, with a clearance between the sealing disc 21 and the valve stem 2. The balancing sealing ring 84 is embedded in the limiting boss 81 and engages with the upper side of the sealing disc 21 in a pressing contact. The balancing spring 83 is located at the lower end of the valve stem 2 and abuts against the lower side of the sealing disc 21. The advantage of this design is that when the valve needs to be opened, the valve stem 2 is first pulled upwards to overcome the preload of the balancing spring 83, causing the valve stem 2 to move the limiting retaining ring 82 against the sealing disc 21. 1. The lower side is pulled, and the balance sealing ring 84 is disengaged from the sealing disc 21 to open the movable gap. This balance sealing ring 84 is only briefly disengaged from the sealing disc 21 during the pressure balance stage. It remains in close contact during normal closure. At this time, the air inlet chamber and air outlet chamber located at both ends of the valve port 10 are connected through the movable gap. The high-pressure side gas flows to the low-pressure side through the movable gap until the air pressure on both sides is equal, so that the pressure applied to the sealing cover of the valve port 10 cancels each other out. Only then can the valve stem 2 be pulled upward. At this time, the valve stem 2 only needs to overcome the resistance of the closing spring 3 to open the valve port 10. This avoids the situation where the sealing cover is too tight due to the high pressure on one side of the traditional valve. This technical solution eliminates the resistance of the air pressure difference to opening the valve by designing a pressure balance structure, which greatly reduces the opening operation force, avoids the risk of valve jamming, and improves the operation safety and response speed.

[0052] like Figure 4 As shown, a spring stop 85 is provided at the lower end of the valve stem 2. The two ends of the balance spring 83 abut against the elastic stop and the sealing disc 21, respectively. The lower side of the sealing disc 21 is provided with a positioning groove 87 for positioning and connecting the balance spring 83, and the elastic stop is provided with a positioning protrusion 86 for positioning and connecting the balance spring 83. This structure, through the spring stop 85 and the positioning groove 87 of the sealing disc 21, forms a rigid clamping space for the balance spring 83. The balance spring 83 is pre-compressed and installed in this space, and its initial elastic force is strictly limited. The positioning groove 87 and the positioning protrusion 86 provide positioning for the two ends of the balance spring 83, preventing radial displacement or bending of the balance spring 83 when compressed, ensuring that the elastic force is transmitted along the axis of the valve stem 2, and avoiding force loss.

[0053] As can be seen from the above structure, this cut-off knob 6 can both drive the valve stem 2 to rotate circumferentially and pull the valve stem 2 to move axially. The top of the connecting seat 11 is provided with an upper blocking boss 12 around the upper port of the guide cavity. The valve stem 2 is provided with a lower blocking boss 22 opposite to the blocking boss. The axial travel of the valve stem 2 is limited by the cooperation of the lower blocking boss 22 and the upper blocking boss 12. In addition, two valve stem sealing rings 9 are fitted on the valve stem 2 and press against the inner wall of the guide cavity. When the valve stem 2 moves up and down along the guide cavity, the valve stem sealing rings 9 are always tightly attached to the inner wall of the guide cavity, preventing gas from leaking out along the valve stem gap, and achieving the effect of dynamic sealing protection.

[0054] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A gas emergency shut-off valve, comprising a valve body (1), a valve stem (2), a shut-off spring (3), and a shut-off assembly, wherein a connecting seat (11) is mounted on the top of the valve body (1), the valve stem (2) is movably inserted between the valve body (1) and the connecting seat (11), and is provided with a sealing disc (21) that cooperates with the valve port (10), and the shut-off spring (3) is disposed between the sealing disc and the valve body (1); characterized in that, The cutting component includes: A locking groove (5) is provided on the side wall of the valve stem (2); A shut-off solenoid valve (4) is installed on a connecting seat (11), which has an elastic valve core (41) that passes through the connecting seat (11) and is connected to a locking groove (5); the elastic valve core (41) forms a limiting fit with the valve stem (2) by being locked in the locking groove (5), and moves out of the locking groove (5) under the drive of the electromagnetic force generated by the energization of the shut-off solenoid valve (4); Release ramp (7) is provided on the valve stem sidewall and extends to the upper side of the locking groove (5); The cut-off knob (6) is linked to the upper end of the valve stem (2). When the cut-off knob (6) drives the valve stem (2) to rotate, the elastic valve core (41) slides relative to the release inclined surface (7) to release the limiting lock of the elastic valve core (41) on the valve stem (2).

2. The gas emergency shut-off valve according to claim 1, characterized in that: The connecting seat (11) has a guide cavity extending along the axial direction of the valve stem (2), the valve stem (2) is movably disposed in the guide cavity, and the moving direction of the elastic valve core (41) is perpendicular to the moving direction of the valve stem (2).

3. The gas emergency shut-off valve according to claim 2, characterized in that: The shut-off solenoid valve (4) includes a coil structure (42) mounted on the side wall of the connecting seat (11), and a stationary iron core (43) and an elastic valve core (41) disposed in the central cavity of the coil structure (42). The side wall of the connecting seat (11) is provided with a guide hole through which the elastic valve core (41) can pass. The guide hole is radially connected to the guide cavity along the valve stem (2).

4. The gas emergency shut-off valve according to claim 3, characterized in that: The elastic valve core (41) includes a movable valve core (411) that is movably disposed in the coil structure (42) relative to the stationary iron core (43), and a valve core spring (412) disposed between the movable valve core (411) and the stationary iron core (43). Under the action of the valve core spring (412), the movable valve core (411) forms a limiting fit with the locking groove (5) on the valve stem (2) through the guide hole.

5. The gas emergency shut-off valve according to claim 3, characterized in that: The coil structure (42) includes an installation guide (44) disposed in its central cavity and opposite to the guide hole. One end of the installation guide (44) extends out of the coil structure (42) and is fixed in the installation groove on the side wall of the connecting seat (11) by a locking member (45). The elastic valve core (41) is movably disposed in the installation guide (44), and the stationary iron core (43) is fixedly connected to the other end of the installation guide (44).

6. The gas emergency shut-off valve according to any one of claims 1-5, characterized in that: The locking groove (5) is an annular groove arranged circumferentially on the side wall of the valve stem (2).

7. The gas emergency shut-off valve according to claim 1, characterized in that: The cut-off knob (6) is movably sleeved on the connecting seat (11) and has a reset state that allows the valve stem (2) to be pulled up to open the valve port (10).

8. The gas emergency shut-off valve according to claim 1, characterized in that: A pressure balancing structure is provided between the valve stem (2) and the sealing disc (21), the pressure balancing structure comprising: The limiting assembly includes a limiting boss (81) and a limiting retaining ring (82) disposed opposite to each other on the valve stem (2). The sealing disc (21) is sleeved on the valve stem (2) and is movable between the limiting boss (81) and the limiting retaining ring (82). There is a movable gap between the sealing disc (21) and the valve stem (2). The balance sealing ring (84) is embedded in the limiting boss (81) and makes contact with the upper side of the sealing disc (21) by compression. A balance spring (83) is sleeved on the lower end of the valve stem (2) and abuts against the lower side of the sealing disc (21); When the valve stem (2) is pulled upward, it causes the balance sealing ring (84) to move away from the sealing disc (21), so that the movable gap connects the air inlet chamber and the air outlet chamber located at both ends of the valve port (10).

9. The gas emergency shut-off valve according to claim 8, characterized in that: The lower end of the valve stem (2) is provided with a spring stop (85), and the two ends of the balance spring (83) abut against the elastic stop and the sealing disc (21) respectively. The lower side of the sealing disc (21) is provided with a positioning groove (87) for positioning and connecting the balance spring (83).

10. The gas emergency shut-off valve according to claim 7, characterized in that: The top of the connecting seat (11) is provided with an upper blocking boss (12) around the upper port of the guide cavity, and the valve stem (2) is provided with a lower blocking boss (22) opposite to the blocking boss. At least one valve stem sealing ring (9) is sleeved on the valve stem (2) and is in extrusion contact with the inner wall of the guide cavity.

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