Gas emergency cut-off valve

Abstract

The gas emergency cut-off valve comprises a valve body with a valve cavity, a gas inlet hole and a gas outlet hole which are communicated with the valve cavity are formed in the valve body, a valve rod and a valve element for opening and closing the gas inlet hole are installed in the valve cavity, the bottom end of the valve rod is connected with the valve element, and the lower portion of the valve rod is connected into the valve body through a rotating shaft in a swinging mode. A passive magnet for driving the valve rod to swing to open and close the valve core is fixed at the top end of the valve rod; an electric control shell is installed outside the valve body, a sealed space is formed in the electric control shell, a driving magnet and a driving assembly are arranged in the sealed space, the driving assembly drives the driving magnet to move in a reciprocating mode so that the driven magnet can be attracted to be close to or repelled to be away from each other, and an electronic assembly for controlling the driving assembly is further arranged in the sealed space. According to the device, the electric control structure for controlling opening and closing of a gas circuit is sealed in the electric control shell outside the valve body, and the electric control structure possibly generating electric sparks is effectively sealed and isolated in an electricity and gas physical isolation mode, so that the aim of preventing explosion and fire disasters is fulfilled.

Description

Technical Field

[0001] This utility model relates to the field of gas valves, and in particular to a gas emergency shut-off valve. Background Technology

[0002] An emergency shut-off valve is a safety device installed on gas equipment pipelines. In the event of a pipeline or its accessories rupture or malfunction, the emergency shut-off valve must be immediately shut off to prevent the accident from escalating. This quickly cuts off the gas supply and prevents the accident from continuing to develop. Therefore, installing an emergency shut-off valve on gas equipment pipelines is extremely important.

[0003] Traditional emergency shut-off valves require manual operation by personnel to pull a lever to cut off the gas supply. On the one hand, manual shut-off is delayed, and on the other hand, in the event of a gas leak, operators cannot approach the emergency shut-off valve for safety reasons. Therefore, remote control is needed to close the emergency shut-off valve. As a result, emergency shut-off valves are increasingly adopting electronic control structures, which can achieve automatic shut-off and sensitive action. However, if a short circuit occurs in the electronic control structure and an electric spark is generated, it can easily cause an explosion. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a gas emergency shut-off valve that is automatic, sensitive, and has good safety features, and is leak-proof and explosion-proof.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is: a gas emergency shut-off valve, comprising a valve body having a valve cavity, wherein the valve body is provided with an air inlet and an air outlet communicating with the valve cavity, a valve stem and a valve core for opening and closing the air inlet are installed in the valve cavity, the bottom end of the valve stem is connected to the valve core, the lower part of the valve stem is oscillatingly connected to the valve body via a rotating shaft, and a passive magnet is fixed at the top end of the valve stem to drive its own oscillation to realize the opening and closing of the valve core; an electronic control housing is installed outside the valve body, and a sealed space is provided inside the electronic control housing, wherein an active magnet and a drive assembly are provided in the sealed space, the drive assembly drives the active magnet to reciprocate, causing the passive magnet to attract closer or repel away, and an electronic assembly for controlling the drive assembly is also provided in the sealed space.

[0006] As a preferred technical solution, the axis of the reciprocating movement of the active magnet corresponds to the height of the passive magnet, one end of the active magnet is attracted to the passive magnet, and the other end of the active magnet is repelled by the passive magnet.

[0007] As a preferred technical solution, the valve cavity is provided with a core seat, the valve core is reciprocally slidably installed in the core seat, the valve core is provided with a slot, and the bottom end of the valve stem is provided with a valve ball inserted into the slot.

[0008] As a preferred technical solution, the driving component includes a motor, the output end of which is provided with a transmission mechanism to drive the active magnet to reciprocate, and the sealed space is also provided with a guide structure to restrict the linear sliding of the active magnet.

[0009] As a preferred technical solution, the driving component includes electromagnetic coils disposed on both sides of the active magnet, and the alternating switching of the left and right electromagnetic coils controls the reciprocating sliding of the active magnet.

[0010] As a preferred technical solution, the valve body includes an upper valve body and a lower valve body, the passive magnet is located in the upper valve body, and the upper valve body is a non-ferromagnetic shell.

[0011] As a preferred technical solution, both the passive magnet and the active magnet are permanent magnets.

[0012] As a preferred technical solution, the surface of the valve core that mates with the air inlet is provided with a sealing gasket.

[0013] As a preferred technical solution, the valve core is fixed to the bottom end of the valve stem and swings with the valve stem.

[0014] As a preferred technical solution, the electronic assembly includes a wireless signal transceiver, a power supply, and a PLC controller.

[0015] Due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0016] 1. This device is equipped with a valve body and an electrical control housing that are isolated from each other. The valve body uses a purely mechanical method to open and close the gas passage, and the electrical control structure that controls the opening and closing of the gas passage is sealed in the electrical control housing outside the valve body. Through a physical isolation between electricity and gas, the electrical control structure that may generate electric sparks is effectively sealed and isolated, thereby preventing explosions and fires.

[0017] Second, the passive magnet located inside the valve body is controlled by the active magnet located outside. The passive magnet moves away from and towards the valve body by using the principle of like poles repelling and unlike poles attracting. The valve core swings through the valve stem to open and close the air passage. This structure can ensure that the internal structure of the valve body is completely sealed inside, and air passage control can be achieved without contact with the outside. The overall sealing performance of the structure is good and the safety is better.

[0018] Third, the distance and proximity of the passive magnet are determined by the position of the active magnet, which replaces the traditional control method that uses the relationship between spring and pressure. It has the advantages of simple structure, good structural stability and high precision. Attached Figure Description

[0019] The accompanying drawings are intended only to illustrate and explain the present invention and do not limit the scope of the present invention.

[0020] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present invention;

[0021] Figure 2 This is a partial structural schematic diagram of Embodiment 1 of this utility model;

[0022] Figure 3 This is a cross-sectional view of Embodiment 1 of this utility model;

[0023] Figure 4 This is a schematic diagram of the valve in the open state according to Embodiment 1 of this utility model;

[0024] Figure 5 This is a schematic diagram of the valve in the closed state according to Embodiment 1 of this utility model;

[0025] Figure 6 This is a schematic diagram of the passive magnet moving away from and approaching in Embodiment 1 of this utility model;

[0026] Figure 7 This is a schematic diagram of the structure of the driving component according to Embodiment 1 of this utility model;

[0027] Figure 8 This is a schematic diagram of the valve in the open state according to Embodiment 2 of this utility model;

[0028] Figure 9 This is a schematic diagram of the valve in the closed state according to Embodiment 2 of this utility model;

[0029] Figure 10 This is a schematic diagram of the structure of the drive component in Embodiment 3 of this utility model;

[0030] In the diagram: 100-valve body; 101-valve cavity; 102-air inlet; 103-air outlet; 104-valve stem; 105-valve core; 106-rotating shaft; 107-passive magnet; 108-core seat; 109-valve ball; 110-sealing gasket; 200-electric control housing; 201-sealing space; 202-active magnet; 203-motor; 204-screw; 205-guide post; 206-electromagnetic coil. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the following detailed description, only certain exemplary embodiments of the present invention are described by way of illustration. Undoubtedly, those skilled in the art will recognize that various modifications can be made to the described embodiments without departing from the spirit and scope of the present invention. Therefore, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.

[0032] Example 1:

[0033] like Figures 1 to 7 As shown, a gas emergency shut-off valve includes a valve body 100 and an electrical control housing 200. The valve body 100 and the electrical control housing 200 are two independent sealing bodies, which are externally fixed together by connecting lugs and screws.

[0034] See Figures 2 to 5 The valve body 100 has a valve cavity 101, an air inlet 102 and an air outlet 103 communicating with the valve cavity 101. The ends of the air inlet 102 and the air outlet 103 on the valve body 100 are provided with threaded sections for connection to gas pipelines. A valve stem 104 and a valve core 105 for opening and closing the air inlet 102 are installed in the valve cavity 101. The bottom end of the valve stem 104 is connected to the valve core 105. The lower part of the valve stem 104 is oscillatingly connected to the valve body 100 through a rotating shaft 106. A passive magnet 107 is fixed at the top end of the valve stem 104 to drive its own oscillation to realize the opening and closing of the valve core 105.

[0035] The valve cavity 101 is provided with a core seat 108, and the valve core 105 is reciprocally slidably mounted in the core seat 108. The core seat 108 is fixed to the valve body 100 and serves as a limiting guide rail for guiding the reciprocating sliding of the valve core 105, so that the valve core 105 can only reciprocate linearly along the valve cavity 101, and the axis of the reciprocating motion of the valve core 105 coincides with the axis of the air inlet 102, ensuring that the reciprocating motion of the valve core 105 can open and close the air inlet 102. The valve core 105 is provided with a slot, and the bottom end of the valve stem 104 is provided with a valve ball 109 inserted into the slot. When the valve stem 104 swings, the valve ball 109 can push the valve core 105 to slide through the slot.

[0036] The valve body 100 includes an upper valve body 100 and a lower valve body 100, which are fixedly connected by screws. A sealing gasket is provided between their mating surfaces to ensure the sealing performance of the valve body 100. The passive magnet 107 is located inside the upper valve body 100. The upper valve body 100 is a non-ferromagnetic shell, which can be made of aluminum or copper, and will not interfere with the oscillation of the passive magnet 107.

[0037] The valve core 105 has a sealing gasket 110 on its surface that mates with the air inlet 102. The sealing gasket 110 can be a rubber gasket. By pressing the rubber gasket against the air inlet 102, the air inlet 102 can be well sealed.

[0038] In this embodiment, the air outlet 103 is much larger than the air inlet 102, and the air inlet 102 is a small hole, which can reduce the resistance when the valve core 105 is closed.

[0039] In this embodiment, the air inlet 102 can be directly machined on the valve body 100, or a flange plate with the air inlet 102 can be installed inside the valve body 100.

[0040] See Figures 4 to 6 An electronic control housing 200 is installed on the outside of the valve body 100. A sealed space 201 is provided inside the electronic control housing 200. An active magnet 202 and a drive assembly are provided inside the sealed space 201. The drive assembly drives the active magnet 202 to move back and forth, causing the passive magnet 107 to attract or repel each other. An electronic assembly for controlling the drive assembly is also provided inside the sealed space 201.

[0041] The axis of reciprocating movement of the active magnet 202 corresponds to the height of the passive magnet 107. One end of the active magnet 202 is attracted to the passive magnet 107, and the other end of the active magnet 202 is repelled by the passive magnet 107. The active magnet 202 slides back and forth along the axial direction, causing its N and S ends to switch to the position of the passive magnet 107. When one end of the active magnet 202 slides to the position of the passive magnet 107, it can attract the passive magnet 107 towards the active magnet 202, thereby causing the valve stem 104 to swing. (See the attached diagram for the state.) Figure 6 (a) When the other end of the active magnet 202 slides to the position of the passive magnet 107, the passive magnet 107 can be moved away from the active magnet 202. See the state below. Figure 6 In the middle (b), the valve stem 104 is driven to swing in the opposite direction.

[0042] See Figure 7 The driving assembly includes a motor 203. The output end of the motor 203 is equipped with a transmission mechanism that drives the active magnet to reciprocate. The active magnet is connected to the transmission mechanism. A guide structure that restricts the linear sliding of the active magnet is also provided within the sealed space. In this embodiment, the transmission mechanism is a screw 204 connected to the output end of the motor 203. The active magnet 202 is threadedly connected to the screw 204. The guide structure can be a guide post 205, and the active magnet 202 slides reciprocally along the guide post 205. When the motor 203 is running, it can drive the screw 204 to rotate, causing the active magnet 202 to slide along the guide post 205.

[0043] Both the passive magnet 107 and the active magnet 202 are permanent magnets. Permanent magnets can maintain their magnetism for a long time under normal use and storage conditions, have a long service life, and can ensure the stability of the valve.

[0044] The electronic assembly includes a wireless signal transceiver, a power supply, and a PLC controller, all of which are sealed within the electronic control housing 200. The power supply can be a battery or a capacitor, used to provide power to the device. The wireless signal transceiver can be remotely controlled; upon receiving a signal, it controls the motor 203 to operate and control the air circuit opening and closing via the PLC controller.

[0045] The working principle of this embodiment is as follows:

[0046] When one end of the active magnet 202 corresponds to the passive magnet 107 and the two repel each other, the passive magnet 107 moves away from the active magnet 202, keeping the valve stem 104 upright. At this time, both the air inlet 102 and the air outlet 103 are open. See the state diagram. Figure 4 At this time, the gas entering the valve body 100 through the air inlet 102 can be discharged through the air outlet 103. When a signal to shut off the valve is received, the motor 203 drives the active magnet 202 to slide along the axial direction, causing the other end of the active magnet 202 to switch to the position of the passive magnet 107. At this time, the two attract each other, and the passive magnet 107 moves closer to the active magnet 202, causing the valve body 100 to swing around the rotation axis 106. Through the valve ball 109, the valve core 105 is pushed towards the air inlet 102 to slide, blocking the air inlet 102. At this time, the air inlet 102 is closed. See the state below. Figure 5 At this time, the gas in the air inlet 102 cannot enter the valve.

[0047] The active magnet 202 moves back and forth under the action of the motor 203. According to the principle that like poles repel and unlike poles attract, it drives the passive magnet 107, thereby driving the valve core 105 through the valve stem 104 to complete the action of blocking the air inlet 102, realizing the emergency cut-off and control of low flow gas.

[0048] This device can be used with a timer. By setting a timer, the valve will automatically cut off the gas supply when the time is reached, preventing explosions and fires caused by users forgetting to close the valve. This device can also be used with an alarm. When the alarm detects a gas leak, the valve will automatically cut off the gas supply, preventing accidents.

[0049] Example 2:

[0050] This embodiment is basically the same as the first embodiment in terms of structure and principle, the main difference being the different structure of the valve core 105.

[0051] See Figure 8 and Figure 9 In this embodiment, the valve core 105 is directly fixed to the bottom end of the valve stem 104. When the passive magnet 107 at the top of the valve stem 104 reciprocates under the influence of the active magnet 202, it drives the valve core 105 to swing along with the valve stem 104. To ensure that the valve core 105 can seal the air inlet 102, a flexible sealing gasket 110 is provided at the valve core 105. The air inlet 102 is sealed by the compression and deformation of the flexible sealing gasket 110. See also Figure 8 With the air intake 102 open, see [link / reference]. Figure 9 The air intake 102 is in the closed state.

[0052] Example 3:

[0053] This embodiment is basically the same in structure and principle as Embodiment 1, the main difference being the driving method of the active magnet 202.

[0054] See Figure 10 The driving component includes electromagnetic coils 206 disposed on both sides of the active magnet 202. The alternating switching of the left and right electromagnetic coils 206 controls the reciprocating sliding of the active magnet 202. Guide posts are provided at both ends of the active magnet 202 to limit its axial sliding. When the left electromagnetic coil 206 is energized and the right electromagnetic coil 206 is de-energized, the active magnet 202 slides to the left; conversely, when the right electromagnetic coil 206 is energized and the left electromagnetic coil 206 is de-energized, the active magnet 202 slides to the right. Each electromagnetic coil 206 includes an iron core and a coil wound around the iron core. The electromagnetic coil 206 is prior art, and its specific structure and principle will not be described in detail here.

[0055] Other embodiments:

[0056] This embodiment is basically the same in structure and principle as Embodiment 1, the main difference being the transmission mechanism of the active magnet 202.

[0057] The transmission mechanism can employ gears, racks, turntables, or similar methods. However, the transmission mechanism of the active magnet is not limited to these structures; other driving methods capable of reciprocating movement also fall within the scope of this application.

[0058] The transmission mechanism includes a gear connected to the output end of the motor, and a rack connected to the active magnet. The gear and the rack are toothed and meshed. When the motor is running, the gear rotates, causing the rack to move back and forth, thereby realizing the reciprocating movement of the active magnet.

[0059] The transmission mechanism includes a turntable connected to the output end of the motor. A swing arm is hinged to the active magnet, and the other end of the swing arm is hinged to the surface of the turntable. The hinge point is eccentric. When the motor is running, the turntable rotates and pulls the active magnet to move back and forth through the swing arm.

[0060] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A gas emergency shut-off valve, characterized in that, The device includes a valve body with a valve cavity. The valve body has an air inlet and an air outlet communicating with the valve cavity. A valve stem and a valve core for opening and closing the air inlet are installed within the valve cavity. The bottom end of the valve stem is connected to the valve core. The lower part of the valve stem is oscillatingly connected to the valve body via a rotating shaft. A passive magnet is fixed to the top end of the valve stem, driving its oscillation to open and close the valve core. An electronic control housing is installed outside the valve body. A sealed space is provided within the electronic control housing. An active magnet and a drive assembly are located within the sealed space. The drive assembly drives the active magnet to reciprocate, causing the passive magnets to attract or repel each other. An electronic assembly for controlling the drive assembly is also located within the sealed space.

2. A gas emergency shut-off valve as described in claim 1, characterized in that: The axis of the reciprocating movement of the active magnet corresponds to the height of the passive magnet. One end of the active magnet is attracted to the passive magnet, and the other end of the active magnet is repelled by the passive magnet.

3. A gas emergency shut-off valve as described in claim 1, characterized in that: The valve cavity is provided with a core seat, and the valve core is reciprocally slidably installed in the core seat. The valve core is provided with a slot, and the bottom end of the valve stem is provided with a valve ball inserted into the slot.

4. A gas emergency shut-off valve as described in claim 1, characterized in that: The drive assembly includes a motor, and the output end of the motor is provided with a transmission mechanism that drives the active magnet to reciprocate. The sealed space is also provided with a guide structure that restricts the linear sliding of the active magnet.

5. A gas emergency shut-off valve as described in claim 1, characterized in that: The driving component includes electromagnetic coils disposed on both sides of the active magnet, and the alternating switching of the left and right electromagnetic coils controls the reciprocating sliding of the active magnet.

6. A gas emergency shut-off valve as described in claim 1, characterized in that: The valve body includes an upper valve body and a lower valve body, and the passive magnet is located in the upper valve body. The upper valve body is a non-ferromagnetic shell.

7. A gas emergency shut-off valve as described in claim 1, characterized in that: Both the passive magnet and the active magnet are permanent magnets.

8. A gas emergency shut-off valve as described in claim 1, characterized in that: The valve core has a sealing gasket on its surface that mates with the air inlet.

9. A gas emergency shut-off valve as described in claim 1, characterized in that: The valve core is fixed to the bottom end of the valve stem and swings with the valve stem.

10. A gas emergency shut-off valve as described in claim 1, characterized in that: The electronic assembly includes a wireless signal transceiver, a power supply, and a PLC controller.

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