Electromagnetic type gas emergency cut-off valve

Abstract

An upper valve cover is fixedly connected to the upper portion of the middle of a valve body in a sealed mode, the two sides of the valve body are the gas inlet end and the gas outlet end respectively, a valve cup is arranged in the middle of the valve body, a valve element is arranged above the valve cup and used for opening and closing the top of the valve cup, and the upper end of the valve element is connected with an execution assembly. The execution assembly is used for providing upward power for the valve element, a metal shell is arranged on the outer side of the execution assembly, and the metal shell is fixedly connected with the upper valve deck in a sealed mode. The stop valve cannot be manually opened in a power-off state, the valve can only be manually opened when power supply recovers, related safety management specifications are met, in addition, when the stop valve is manually opened, even if the gas inlet end has large pressure, gas at the gas inlet end can flow to the gas outlet end by firstly driving the fin plate of the valve clack shaft to move upwards, and the safety of the stop valve is improved. The pressure difference between the two ends is reduced, the valve clack is pulled to open the stop valve in a more labor-saving mode, time and labor are saved, operation is convenient and fast, and in addition, an anti-explosion structure is arranged, and safety and reliability are higher.

Description

Technical Field

[0001] The present invention belongs to the technical field of solenoid valves, and particularly relates to an electromagnetic gas emergency cut-off valve. Background Art

[0002] Electromagnetic gas emergency cut-off valves are generally used on natural gas pipelines to control the on-off of the pipelines. They are generally used in conjunction with alarms to cut off the pipelines in case of equipment failure, seal failure, leakage or emergency to prevent the expansion of the accident scope. Currently, the national mandatory standard GB 44016-2024 for electromagnetic gas emergency cut-off valves has been introduced. For normally closed types, it is required that the valve is continuously powered and in the open state during normal operation, and should be able to automatically close when receiving a power-off and valve-closing signal. It should not be manually opened in the power-off state and should be able to be manually opened when the power supply is restored. When receiving the power-off and valve-closing signal again, it should be able to automatically close. In existing products, some valves can also be manually opened in the power-off state, which does not meet the relevant safety management specifications. In addition, when the valve is opened, the inlet end of the valve is filled with gas while the outlet end has no gas, and the gas pressure acting on the valve disc is relatively large. At this time, it is more difficult to manually open the valve, especially for large-diameter valves, and it is necessary to close the front-end valve, which is time-consuming and laborious. Summary of the Invention

[0003] The purpose of the present invention is to provide an electromagnetic gas emergency cut-off valve to solve the technical problems in the background art.

[0004] To achieve the above purpose, the specific technical solution of an electromagnetic gas emergency cut-off valve of the present invention is as follows:

[0005] An electromagnetic gas emergency cut-off valve, a upper valve cover is fixedly and sealingly connected above the middle of the valve body. The two sides of the valve body are respectively an inlet end and an outlet end. A valve cup is arranged in the middle of the valve body, and a valve core is arranged above the valve cup. The valve core is used for the switch at the top of the valve cup. The upper end of the valve core is connected with an actuating assembly, which is used to provide upward power for the valve core. A metal shell is arranged outside the actuating assembly, and the metal shell is fixedly and sealingly connected with the upper valve cover; the valve core includes a valve flap shaft, a wing plate is arranged at the upper end of the valve flap shaft, a valve flap is sleeved on the valve flap shaft under the wing plate, the lower end of the valve flap shaft is connected with a gas guiding nut, there is a gap between the valve flap and the valve flap shaft, and the valve flap can move relatively between the wing plate and the gas guiding nut. The valve flap is disc-shaped, and the diameter of the valve flap is larger than the diameter of the corresponding valve cup. A return spring is arranged between the upper valve cover and the wing plate, and the return spring is sleeved outside the core shaft. A corresponding groove is arranged on the corresponding upper side of the valve flap in contact with the wing plate of the valve flap shaft, and a sealing rubber ring is arranged in the groove.

[0006] Furthermore, the execution component includes a metal housing that is hermetically and fixedly connected above the upper valve cover. A bottom plate is threadedly connected to the lower part of the metal housing. The outer side surface of the bottom plate is threadedly connected to the inner side of the metal housing, and the inner side surface of the bottom plate is threadedly connected to the outer side surface of the lower part of the copper tube. A coil is sleeved outside the copper tube, and the coil is connected to the outside through a power cord. An iron core is arranged inside the copper tube. An upper cover plate is arranged at the upper end of the iron core. A limiting groove corresponding to the copper tube is arranged on the upper cover plate. The upper end of the copper tube is inserted into the limiting groove of the upper cover plate. A sealing cover is arranged above the upper cover plate, and the sealing cover is fixedly and hermetically connected to the top of the metal housing. The lower end of the iron core inside the copper tube is fixedly connected to the upper end of the core shaft, and the upper end of the iron core is fixedly connected to the lower end of the small shaft. The iron core can move relatively up and down inside the copper tube. The small shaft extends upward to the outside of the sealing cover. Correspondingly, a through hole corresponding to the small shaft is arranged on the sealing cover. Similarly, a groove and a sealing rubber ring are arranged inside the through hole. A shaft cap is fixedly connected to the top of the small shaft.

[0007] Furthermore, a gas guiding groove is arranged on the gas guiding nut; a sealing gasket is arranged at the position corresponding to the upper port of the valve cup at the bottom of the valve flap. The sealing gasket is circular and is fixedly connected to the valve flap.

[0008] Furthermore, a stepped hole is arranged in the middle of the upper valve cover. A connecting piece is arranged in the stepped hole. A groove and a sealing rubber ring are arranged on the platform surface of the stepped hole of the upper valve cover. The connecting piece is clamped in the stepped hole and extends downward through the upper valve cover. The lower end of the connecting piece is fixedly connected to the upper valve cover through a connecting nut. In addition, a through hole is arranged in the middle of the connecting piece. The upper end of the core shaft passes through the through hole and is fixedly connected to the execution component. Correspondingly, a groove and a sealing rubber ring are arranged on the side wall of the through hole in the middle of the connector.

[0009] Furthermore, a dust cover is also arranged on the upper part of the sealing cover. The dust cover is detachably and hermetically connected to the sealing cover. The dust cover can seal the small shaft and the shaft cap in the dust cover; a sealing member is installed in the wire passing hole of the power cord of the coil. The power cord passes through the sealing member, and then the sealing member is tightly pressed by screwing a nut, so that the sealing member is closely attached to the power cord.

[0010] An electromagnetic gas emergency cut-off valve of the present invention has the following advantages: It is continuously powered and in an open state during normal operation. It can automatically close when receiving a power-off and valve-closing signal, cannot be manually opened in the power-off state, and can only be manually opened when the power supply is restored, which complies with relevant safety management specifications. In addition, when the cut-off valve is manually opened, even under a large pressure at the intake end, it can first drive the wing plate of the valve flap shaft to move upward, enabling the gas at the intake end to flow to the outlet end, reducing the pressure difference between the two ends, and then more labor-savingly pulling the valve flap to open the cut-off valve, saving time and effort, and being convenient to operate without closing the upper valve. Moreover, the metal shell, bottom plate, upper cover plate, and sealing plate together form an explosion-proof structure, enclosing all components such as the coil and iron core in the metal shell, separating the internal space of the cut-off valve from the surrounding environment, playing a role in explosion isolation and explosion protection, and being safer and more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a schematic structural diagram of the cut-off valve of the present invention;

[0012] Figure 2 is a cross-sectional view of the cut-off valve of the present invention;

[0013] Figure 3 is a cross-sectional view of the valve core of the present invention;

[0014] Figure 4 is a cross-sectional view of the actuator assembly of the present invention;

[0015] Figure 5 is a schematic structural diagram of the air guide nut of the present invention;

[0016] Reference numerals in the figures: 1, valve body; 11, intake end; 12, outlet end; 13, valve cup; 2, upper valve cover; 3, valve core; 31, valve flap shaft; 32, valve flap; 33, air guide nut; 331, air guide groove; 34, core shaft; 35, return spring; 36, connecting piece; 37, sealing gasket; 4, actuator assembly; 41, metal shell; 42, bottom plate; 43, copper tube; 44, upper cover plate; 45, coil; 46, iron core; 47, small shaft; 48, sealing cover; 49, shaft cap; 5, dust cap. DETAILED DESCRIPTION OF THE INVENTION

[0017] In order to better understand the purpose, structure and function of the present invention, the following further describes in detail an electromagnetic gas emergency cut-off valve of the present invention with reference to the accompanying drawings.

[0018] As Figures 1-5As shown in the figure, the electromagnetic gas emergency cut-off valve of the present invention includes a valve body 1. An upper valve cover 2 is fixedly and sealingly connected above the middle of the valve body 1. The two sides of the valve body 1 are an air inlet end 11 and an air outlet end 12 respectively. A valve cup 13 is arranged in the middle of the valve body 1. A valve core 3 is arranged above the valve cup 13. The valve core 3 is used for switching the top of the valve cup 13, that is, the switch of the valve body 1, to control the on-off of the fluid. The upper end of the valve core 3 is connected with an actuator assembly 4. The actuator assembly 4 is used to provide upward power for the valve core 3. A metal shell 41 is arranged outside the actuator assembly 4. The metal shell 41 is fixedly and sealingly connected with the upper valve cover 2.

[0019] Specifically, as Figures 2-3 shown, the valve core 3 includes a valve flap shaft 31. A valve flap 32 is connected to the lower part of the valve flap shaft 31. The upper end of the valve flap shaft 31 is fixedly connected with a core shaft 34. The core shaft 34 passes through the upper valve cover 2 and is fixedly connected with the actuator assembly 4. Specifically, wing plates are arranged at the upper end of the valve flap shaft 31. The valve flap 32 is sleeved on the valve flap shaft 31 on the lower side of the wing plates. A gas guiding nut 33 is connected to the lower end of the valve flap shaft 31. The gas guiding nut 33 plays a role in limiting the valve flap 32. A gap is left between the valve flap 32 and the valve flap shaft 31. The valve flap 32 can move relatively between the wing plates and the gas guiding nut 33. The valve flap 32 is disc-shaped. The diameter of the valve flap 32 is larger than the diameter of the corresponding valve cup 13, and is used to block or open the upper port of the valve cup 13. A return spring 35 is arranged between the upper valve cover 2 and the wing plates. The return spring 35 is sleeved outside the core shaft 34. The return spring 35 provides a downward pressure to make the wing plates squeeze the valve flap 32 so as to block the upper port of the valve cup 13. In addition, in order to ensure the sealing performance of the valve body 1, corresponding grooves are arranged on the corresponding upper side surfaces where the valve flap 32 contacts the wing plates of the valve flap shaft 31, and sealing rubber rings are arranged in the grooves. In the closed state, the wing plates of the valve flap shaft 31 press down the valve flap 32 under the action of the return spring 35, and the sealing rubber ring is located between the wing plates and the valve flap 32, ensuring its sealing performance. A stepped hole is arranged in the middle of the upper valve cover 2. A connecting piece 36 is arranged in the stepped hole. Grooves and sealing rubber rings are arranged on the platform surface of the stepped hole of the upper valve cover 2. The connecting piece 36 is clamped in the stepped hole and extends downward through the upper valve cover 2. The lower end of the connecting piece 36 is fixedly connected with the upper valve cover 2 through a connecting nut. In addition, a through hole is arranged in the middle of the connecting piece 36. The upper end of the core shaft 34 passes through the through hole and is fixedly connected with the actuator assembly 4. Corresponding grooves and sealing rubber rings are arranged on the side wall of the through hole in the middle of the connector, so as to ensure the sealing performance between the connector and the core shaft 34.

[0020] Specifically, as Figure 2 and Figure 4As shown, the actuator assembly 4 includes a metal housing 41 which is fixedly connected in a sealed manner above the upper valve cover 2. A bottom plate 42 is threadedly connected to the lower part of the metal housing 41. The bottom plate 42 is annular. The outer side surface of the bottom plate 42 is threadedly connected to the inner side of the metal housing 41, and the inner side surface of the bottom plate 42 is threadedly connected to the outer side surface of the lower part of the copper tube 43. A coil 45 is sleeved outside the copper tube 43. The coil 45 is connected to the outside through a power cord. The copper tube 43 can play a role in heat conduction and temperature reduction to prevent the coil 45 from overheating due to long-term operation. An iron core 46 is arranged inside the copper tube 43. An upper cover plate 44 is arranged at the upper end of the iron core 46. A limiting groove corresponding to the copper tube 43 is arranged on the upper cover plate 44. The upper end of the copper tube 43 is inserted into the limiting groove of the upper cover plate 44. A sealing cover 48 is arranged above the upper cover plate 44. The sealing cover 48 is fixedly and sealingly connected to the top of the metal housing 41. The lower end of the iron core 46 inside the copper tube 43 is fixedly connected to the upper end of the core shaft 34, and the upper end of the iron core 46 is fixedly connected to the lower end of the small shaft 47. The iron core 46 can move relatively up and down inside the copper tube 43. The small shaft 47 extends upward to the outside of the sealing cover 48. Correspondingly, a through hole corresponding to the small shaft 47 is arranged on the sealing cover 48. Similarly, a groove and a sealing rubber ring are arranged inside the through hole to ensure the sealing performance between the small shaft 47 and the sealing cover 48. A shaft cap 49 is fixedly connected to the top of the small shaft 47.

[0021] When the cut-off valve is in normal use, it is in a long-term power-on state. Under normal power-on conditions, the solenoid valve remains open. In the case of power-off, the cut-off valve closes. When power is restored after power-off, manual intervention is required to manually open it. Specifically, under normal power-on conditions, the coil 45 is connected to an external power source, and the coil 45 generates an electromagnetic force, causing the iron core 46 to be subjected to an upward magnetic force, so that the iron core 46 remains in contact with the upper cover plate 44 inside the copper tube 43. At this time, the return spring 35 of the valve core 3 is in a compressed state, and the valve flap 32 is away from the upper port of the valve cup 13, thus keeping the valve open and maintaining the fluid flow. However, when the alarm detects gas leakage or other dangers, after the cut-off valve is powered off, the coil 45 does not generate the corresponding electromagnetic force after power-off. Under the action of the return spring 35, the valve flap shaft 31 and the valve flap 32 move downward until the valve flap 32 abuts against the upper end of the valve cup 13 opening, realizing the blocking of the valve cup 13 opening, that is, the cut-off of the valve. But when the danger is eliminated and power is restored, it needs to be reopened, and manual intervention is required. After power-on, the coil 45 generates an electromagnetic force, but this electromagnetic force cannot directly adsorb the iron core 46 upward. It is necessary to manually lift the shaft cap 49 upward, driving the iron core 46, the core shaft 34, and the valve flap 32 to move upward against the resistance of the return spring 35. The additional electromagnetic force generated by the coil 45 causes the iron core 46 to be adsorbed on the upper cover plate 44, thus realizing the opening of the valve.

[0022] In addition, when the valve is opened and the intake end 11 is filled with gas, pulling up the shaft cap 49 also needs to overcome the pressure of the gas on the valve flap 32. When the gas pressure is relatively high, the pressure on the valve flap 32 will also be relatively high. There may be a situation where it is difficult to pull the shaft cap 49, or even impossible to pull it. In the valve core 3 of the cut-off valve of the present application, the valve flap 32 can move relative to the valve flap shaft 31, and the force-bearing area of the wing plate of the valve flap shaft 31 is smaller than the force-bearing area of the valve flap 32. Therefore, the gas pressure received by the wing plate is less than the gas pressure received by the valve flap 32. When manually pulling up the shaft cap 49, the valve flap shaft 31 is first pulled up. When a gap is generated between the wing plate of the valve flap shaft 31 and the upper side surface of the valve flap 32, the gas can enter the outlet end 12 through the gap between the wing plate of the valve flap shaft 31 and the side of the valve flap shaft 31 and the gap between the valve flap 32 and the lower side of the valve flap shaft 31, balancing a part of the pressure difference on both sides, reducing the pressure received by the valve flap 32. Continuing to lift upwards, after the nut at the bottom of the valve flap shaft 31 contacts the valve flap 32, the valve flap 32 is driven to move upwards together, thereby opening the valve and realizing the opening of the valve.

[0023] Further, in order to prevent the gas flow from being blocked after the air guiding nut 33 contacts the bottom surface of the valve flap 32 during the process of lifting the valve flap shaft 31 upwards, as Figure 5 shown, an air guiding groove 331 is provided on the air guiding nut 33. Even if the nut contacts the bottom of the valve flap 32, the gas can flow from the air guiding groove 331 to the outlet end 12, thereby reducing the pressure difference between the intake end 11 and the outlet end 12, making it easier and more labor-saving to open this cut-off valve. Without closing the front-end valve, this cut-off valve can be manually opened.

[0024] In addition, in order to further ensure the cut-off effect when this cut-off valve is closed, a sealing gasket 37 is provided at the position corresponding to the upper port of the valve cup 13 at the bottom of the valve flap 32. The sealing gasket 37 is circular, and the sealing gasket 37 is fixedly connected to the valve flap 32. When closing this cut-off valve, the valve flap 32 moves downwards, and the sealing gasket 37 contacts the side wall of the upper port of the valve cup 13 and seals the valve cup 13, making the sealing effect better when this cut-off valve is closed.

[0025] A dust-proof cover is also provided on the upper part of the sealing cover 48. The dust-proof cover is detachably and sealingly connected to the sealing cover 48. The dust-proof cover can enclose the small shaft 47 and the shaft cap 49 in the dust-proof cover, which can prevent the small shaft 47 and the shaft cap 49 from being covered with oil stains and dust. When manually opening this cut-off valve, the dust-proof cap 5 is removed, the shaft cap 49 is pulled to open the cut-off valve, and then the dust-proof cap 5 is buckled on the sealing cover 48.

[0026] In addition, the metal shell 41, bottom plate 42, upper cover plate 44, and sealing plate of the present application together form an explosion-proof structure, which encloses all components such as the coil 45 and iron core 46 within the metal shell 41, separating the internal space of the cut-off valve from the surrounding environment and playing a role in explosion isolation and prevention. The power cord of the coil 45 of the present application is also provided with a seal in the wire passing hole. The power cord passes through the seal, and then the seal is tightly pressed by screwing a nut, so that the seal fits closely with the power cord to achieve sealing and prevent moisture, dust, etc. from entering the interior of the cut-off valve.

[0027] For the electromagnetic gas emergency cut-off valve of the present application, it is continuously powered and in an open state during normal operation, can automatically close when receiving a power-off and valve-closing signal, cannot be manually opened in a power-off state, and can only be manually opened when the power supply is restored, which complies with relevant safety management regulations. In addition, when the cut-off valve is manually opened, even under a relatively large pressure at the intake end 11, it is possible to first drive the wing plate of the valve flap shaft 31 to move upward, so that the gas at the intake end 11 can flow to the outlet end 12, reducing the pressure difference between the two ends, and then more easily pulling the valve flap 32 to open the cut-off valve. In addition, the metal shell 41, bottom plate 42, upper cover plate 44, and sealing plate together form an explosion-proof structure, which encloses all components such as the coil 45 and iron core 46 within the metal shell 41, separating the internal space of the cut-off valve from the surrounding environment and playing a role in explosion isolation and prevention.

[0028] It can be understood that the present invention is described through some embodiments. As is known to those skilled in the art, without departing from the spirit and scope of the present invention, various changes or equivalent substitutions can be made to these features and embodiments. Additionally, under the teaching of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application belong to the scope protected by the present invention.

Claims

1. An electromagnetic gas emergency shut-off valve, characterized in that: The invention comprises a valve body (1), an upper valve cover (2) is fixedly and sealedly connected to the upper middle part of the valve body (1), two sides of the valve body (1) are respectively an air inlet end (11) and an air outlet end (12), a valve cup (13) is arranged in the middle of the valve body (1), a valve core (3) is arranged above the valve cup (13), the valve core (3) is used for switching the top of the valve cup (13), an actuator (4) is connected to the upper end of the valve core (3), the actuator (4) is used for providing upward power for the valve core (3), a metal shell (41) is arranged on the outer side of the actuator (4), and the metal shell (41) is fixedly and sealedly connected to the upper valve cover (2); The valve core (3) comprises a valve flap shaft (31), a fin plate is arranged at the upper end of the valve flap shaft (31), the valve flap (32) is sleeved on the valve flap shaft (31) at the lower side of the fin plate, the lower end of the valve flap shaft (31) is connected with an air guide nut (33), a gap is left between the valve flap (32) and the valve flap shaft (31), the valve flap (32) can move relatively between the fin plate and the air guide nut (33), the valve flap (32) is disc-shaped, the diameter of the valve flap (32) is larger than the diameter of the corresponding valve cup (13), a return spring (35) is arranged between the upper valve cover (2) and the fin plate, the return spring (35) is sleeved on the outer side of the core shaft (34), a corresponding groove is arranged on the corresponding upper side surface where the valve flap (32) contacts the fin plate of the valve flap shaft (31), and a sealing rubber ring is arranged in the groove.

2. The electromagnetic gas emergency shut-off valve according to claim 1, characterized in that: The actuator assembly (4) comprises a metal shell (41) which is arranged on the upper valve cover (2) and is sealed and fixedly connected. The lower part of the metal shell (41) is threadedly connected to a bottom plate (42). The outer side surface of the bottom plate (42) is threadedly connected to the inner side surface of the metal shell (41). The inner side surface of the bottom plate (42) is threadedly connected to the lower outer side surface of the copper tube (43). A coil (45) is sleeved on the outer side of the copper tube (43). The coil (45) is connected to the outside through a power line. An iron core (46) is arranged inside the copper tube (43). An upper cover plate (44) is arranged at the upper end of the iron core (46). A limit groove corresponding to the copper tube (43) is arranged on the upper cover plate (44). The upper end of the copper tube (43) is inserted into the upper end of the copper tube (43). A sealing cover (48) is arranged above the upper cover (44) in the limiting groove of the upper cover (44), and the sealing cover (48) is fixedly and sealedly connected to the top of the metal shell (41). The lower end of the iron core (46) inside the copper tube (43) is fixedly connected to the upper end of the core shaft (34), and the upper end of the iron core (46) is fixedly connected to the lower end of the small shaft (47). The iron core (46) can move up and down relatively in the copper tube (43), and the small shaft (47) extends upward to the outside of the sealing cover (48). Correspondingly, a through hole corresponding to the small shaft (47) is arranged on the sealing cover (48), and a groove and a sealing rubber ring are also arranged inside the through hole. A shaft cap (49) is fixedly connected to the top of the small shaft (47).

3. The electromagnetic gas emergency shut-off valve according to claim 2, characterized in that: The air guide nut (33) is provided with an air guide groove (331).

4. The electromagnetic gas emergency shut-off valve according to claim 3, characterized in that: A sealing gasket (37) is provided at a position of the bottom of the valve flap (32) corresponding to the upper port of the valve cup (13); the sealing gasket (37) is annular and fixedly connected to the valve flap (32).

5. According to claim 4, an electromagnetic gas emergency shut-off valve is provided with a step hole in the middle of the upper valve cover (2), a connecting piece (36) is provided in the step hole, a groove and a sealing rubber ring are provided on the platform surface of the step hole of the upper valve cover (2), the connecting piece (36) is clamped in the step hole, and the lower end extends downward through the upper valve cover (2), and the lower end of the connecting piece (36) is fixedly connected to the upper valve cover (2) through a connecting nut, in addition, a through hole is provided in the middle of the connecting piece (36), the upper end of the core shaft (34) passes through the through hole and is fixedly connected to the actuator (4), and a groove and a sealing rubber ring are correspondingly provided on the side wall of the through hole in the middle of the connector.

6. The electromagnetic gas emergency shut-off valve according to claim 5, characterized in that: A dust cover is also provided on the upper part of the sealing cover (48), and the dust cover is detachably sealed and connected to the sealing cover (48). The dust cover can seal the small shaft (47) and the shaft cap (49) in the dust cover.

7. The electromagnetic gas emergency shut-off valve according to claim 6, characterized in that: A sealing member is installed in the wire hole of the power line of the coil (45), the power line passes through the sealing member, and then the sealing member is tightened and squeezed by a nut, so that the sealing member and the power line are tightly fitted.

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