Leak-proof timing self-closing valve of gas pipeline

Abstract

The invention belongs to the technical field of self-closing valves, and discloses an anti-leakage timing self-closing valve for a gas pipeline, which comprises an anti-leakage mechanism, the anti-leakage mechanism comprises a valve body, a moving cavity is hermetically and slidably mounted in the valve body, the moving cavity is divided into a front baffle and a rear baffle, a first gas inlet is formed in the front baffle, and a second gas inlet is formed in the rear baffle; a first air outlet is formed in the rear baffle, a first spring is connected between the valve body and the rear baffle, a blocking plate is arranged in the moving cavity and connected with a pressing ring through a second spring, a sliding rod is fixedly connected to one side of the pressing ring, and the other end of the sliding rod extends into the valve body and is fixedly connected with the valve body. The sliding rod slides in the rear baffle in a sealed mode. Due to the arrangement of the anti-leakage mechanism, when the problems of overpressure, underpressure and overcurrent occur, the anti-leakage gas stove can adapt to the situation to perform a timely and quick closing function, and the leakage of a large amount of gas is prevented.

Description

Technical Field

[0001] The invention belongs to the technical field of self-closing valves, in particular to a leakage-proof timing self-closing valve for a gas pipeline. Background Art

[0002] As the most cost-effective energy supply material, gas has been popularized in every household; however, accidents caused by improper use of gas have occurred frequently in recent years; according to incomplete statistics, most of the accidents are caused by not using gas for a long time, but failing to close the air intake valve in time; or due to unstable gas pressure, users are not aware of closing the air intake valve in time and other factors.

[0003] The Chinese patent with application number CN202320814722.5 discloses a timed self-closing valve, including: a valve body and a valve cover, the upper side of the valve body is connected to the valve cover; it also includes: a timing device and a valve stem pushing device, the upper side of the valve cover is connected to the timing device, a driving hole is provided in the center of the timing device, and the valve stem pushing device passes through the driving hole to connect with the valve stem of the self-closing valve. It solves the defects in the prior art that the timed self-closing valve has structural design defects, the timing device cannot be manufactured and assembled in one go, resulting in high production costs, affecting product quality and product service life. The timed self-closing valve has a reasonable structural design, a driving hole is provided for the timing device, and the connection with the valve stem pushing device is achieved through the driving hole, so that all gear meshing structures of the timing device can be processed and assembled in one go. It meets the requirements of one-time production and manufacturing of the timing device, improves production efficiency, and ensures the assembly accuracy and service life of the self-closing valve.

[0004] However, during the use of the above-mentioned self-closing valve, when a pipeline leak occurs, the timed closing function is still maintained. The continuous output of gas will greatly increase the accident rate. It cannot adapt to various situations and make timely and rapid closing functions, resulting in large-scale gas leakage. Therefore, it is necessary to develop a timed self-closing valve that can effectively reduce leakage. Traditional self-closing valves cannot meet emergency needs for overpressure or underpressure in non-leakage situations. Summary of the invention

[0005] The purpose of the present invention is to provide an anti-leakage timed self-closing valve for a gas pipeline, which solves the problem that the prior art cannot adapt to various situations and make timely and rapid closing functions, resulting in large-scale gas leakage, and cannot meet emergency needs for overpressure or underpressure in non-leakage situations.

[0006] To achieve the above object, the present invention provides the following technical solution: a leak-proof timing self-closing valve for a gas pipeline, comprising a leak-proof mechanism, a timing mechanism and a valve pipe, wherein the timing mechanism is arranged above the leak-proof mechanism, the leak-proof mechanism is fixed on the valve pipe, and connectors are fixedly connected at both ends of the valve pipe;

[0007] The anti-leakage mechanism comprises a valve body, a movable cavity is sealingly and slidably installed inside the valve body, the movable cavity comprises a front baffle and a rear baffle, the front baffle is arranged in a trapezoidal structure, the front baffle is provided with a first air inlet, the rear baffle is provided with a first air outlet, a first spring is connected between the valve body and the rear baffle, a blocking plate is arranged inside the movable cavity, the blocking plate is connected with a pressure ring through a second spring, a sliding rod is fixedly connected to one side of the pressure ring, the other end of the sliding rod is fixedly connected to the side wall of the valve body, and the sliding rod is sealingly and slidably connected to the rear baffle;

[0008] The timing mechanism comprises a timing assembly and an escapement assembly. The bottom of the timing assembly is connected to a wedge block via a connecting rod. The connecting rod is sealingly and slidingly connected to the top of the valve body. The wedge surface of the wedge block is slidably matched with the front baffle.

[0009] As a further solution of the present invention, the second spring makes the blocking plate abut against the inner side of the front baffle in a natural state.

[0010] As a further solution of the present invention, a partition is fixed in the valve tube, a second air inlet is opened above the front end of the partition in the valve tube, and a second air outlet is opened above the end of the valve tube.

[0011] As a further solution of the present invention, the second air inlet is communicated with the front side of the front baffle, and the second air outlet is communicated with the rear side of the rear baffle.

[0012] As a further solution of the present invention, the timing assembly includes a timing knob, the bottom of the timing knob is fixedly connected to a rotating rod, the other end of the rotating rod is fixedly connected to the top of the valve body, the upper part of the rotating rod is fixed with a first spur gear, the first spur gear is respectively meshed with a second spur gear and a fourth spur gear, a first bevel gear is fixedly connected below the second spur gear, the first bevel gear is rotatably installed on the top of the valve body via a rotating shaft, the first bevel gear is meshed with a second bevel gear, the second bevel gear is connected to a third spur gear, the third spur gear is rotatably installed inside a support block via a rotating shaft, the support block is fixedly installed on the top of the valve body, and the third spur gear is meshed with a rack.

[0013] As a further solution of the present invention, an annular groove is provided at the bottom of the timing knob, a slider is slidably installed inside the annular groove, the slider is connected to the rack through a telescopic rod, the end of the rack is fixedly connected to the connecting rod, and a third spring is connected between the top of the rack and the slider.

[0014] As a further solution of the present invention, when the timing knob returns to zero, the third spring presses the rack so that the wedge block presses the front baffle, thereby making the front baffle fit the blocking plate.

[0015] As a further solution of the present invention, the escapement assembly includes an escapement wheel, which is rotatably mounted on the top of the valve body via a rotating shaft, and the escapement wheel is clamped with an escapement fork, which is rotatably mounted on the top of the valve body via a rotating shaft, and the tail of the escapement fork is clamped with an impact pin, which is rotatably mounted on the top of the valve body via a rotating shaft, and the bottom of the impact pin is fixedly connected to one end of a coil spring, and the other end of the coil spring is fixedly connected to the top of the valve body.

[0016] As a further solution of the present invention, a time scale is provided on the top of the valve body on the outer peripheral side of the timing knob.

[0017] As a further solution of the present invention, an elastic rubber plate is provided on one side of the blocking plate close to the front baffle.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. Due to the setting of the anti-leakage mechanism of the present invention, when the self-closing valve works normally, the gas enters the valve body through the connecting head. At this time, the gas pressure is balanced with the gas pressure, and the first spring pushes the movable cavity to maintain balance with the gas pressure. The movable cavity cannot move, and the gas pushes the blocking plate to squeeze the second spring through the first gas inlet. At this time, the gas can enter normally from the first gas inlet, then flow out from the first gas outlet, and then flow out through the connecting head; when an overpressure problem occurs, the gas enters the valve body through the connecting head. At this time, the gas pressure is greater than the gas pressure, so that the gas pressure pushes the movable cavity to squeeze the first spring, so that the first gas inlet fits with the blocking plate to achieve a tight seal. Sealed, at this time the gas cannot enter from the first air inlet; when an underpressure problem occurs, the gas enters the valve body through the connecting head. At this time, the gas pressure is lower than the gas pressure, and the gas pressure cannot push the sealing plate. The first air inlet and the sealing plate are in a fit state, and the gas cannot enter from the first air inlet; when an overcurrent problem occurs, the gas appliance exceeds the normal gas flow rate. At this time, the gas pressure is greater than the gas pressure, so that the gas pressure pushes the moving cavity to squeeze the first spring, so that the first air inlet and the sealing plate are in fit, achieving sealing. At this time, the gas cannot enter from the first air inlet, thereby achieving the function of timely and rapid closing to adapt to various situations to prevent large-scale gas leakage.

[0020] 2. Due to the setting of the timing component of the present invention, when the self-closing valve is used, the wedge block is in the initial position, the first air inlet is in contact with the sealing plate, and the gas cannot pass through. The timing knob is turned to rotate the pointer scale to the corresponding time scale. At this time, the timing knob drives the gear to rotate, the gear drives the first bevel gear to rotate, the gear drives the second bevel gear to rotate, the second bevel gear drives the rack to move upward, the rack drives the wedge block to move upward and squeezes the third spring at the same time. At this time, the first spring pushes the movable cavity back to the initial position, and the gas can pass normally to achieve timing.

[0021] 3. Due to the arrangement of the escapement assembly of the present invention, when the timing is completed, the third spring pushes the rack to move downward, and the rack drives the second bevel gear to rotate in the opposite direction. At the same time, the second bevel gear drives the first bevel gear to rotate, and the first bevel gear drives the gear to rotate, and the gear drives the escapement wheel to rotate. The exit fork on the right side of the escapement fork clamps the escapement wheel, making the escapement wheel unable to rotate, and other gears are also unable to rotate. At the same time, the inclined surface of the escapement wheel teeth impacts the exit fork on the right side of the escapement fork, giving the escapement fork a certain kinetic energy, and the escapement fork imparts the kinetic energy to the impact pin through the plug, so that the impact pin swings back and forth. After the swing, the impact pin stores a certain elastic force in the coil spring and starts to swing back, driving the impact pin to hit the plug of the escapement fork, so that the escapement wheel gets rid of the restriction of the escapement fork, and at the same time drives the escapement fork to deflect, so that the exit fork on the left side of the escapement fork clamps the escapement wheel, and the back and forth swing of the escapement fork keeps the overall rotation speed of the gear unchanged, thereby ensuring the accuracy of the timing function.

[0022] 4. The present invention can effectively ventilate slight overpressure or underpressure by timing to prepare for emergency needs, and due to the timing effect, it can automatically close in such an emergency state to avoid hidden dangers, and can remain closed for gas leaks, with a better anti-leakage effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the present invention;

[0024] Figure 2 It is a cross-sectional view of the internal structure of the present invention;

[0025] Figure 3 It is a schematic diagram of the mobile cavity of the present invention;

[0026] Figure 4 It is a cross-sectional view of the mobile cavity of the present invention;

[0027] Figure 5 It is an enlarged view of the timing mechanism of the present invention;

[0028] Figure 6 It is a positive isometric view of the timing mechanism of the present invention;

[0029] Figure 7 It is a side isometric view of the timing mechanism of the present invention;

[0030] Figure 8 It is a top view of the timing mechanism of the present invention.

[0031] In the figure: 1. anti-leakage mechanism; 101. valve body; 102. moving chamber; 103. front baffle; 104. rear baffle; 105. first air inlet; 106. first air outlet; 107. first spring; 108. blocking plate; 109. second spring; 110. pressure ring; 111. slide bar; 2. timing mechanism; 21. timing assembly; 210. timing knob; 211. annular groove; 212. slider; 213. first straight gear; 214. first bevel gear; 2 15. Second bevel gear; 216. Support block; 217. Rack; 218. Third spring; 219. Connecting rod; 22. Escapement assembly; 220. Escapement wheel; 221. Pallet fork; 222. Impact pin; 223. Coil spring; 224. Wedge block; 225. Turn bar; 226. Second spur gear; 227. Third spur gear; 228. Fourth spur gear; 3. Valve tube; 301. Partition; 302. Second air inlet; 303. Second air outlet; 4. Connector. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Example 1

[0034] like Figure 1-8 As shown, the present invention provides a leak-proof timed self-closing valve for a gas pipeline, comprising: an leak-proof mechanism 1 and a valve tube 3, the leak-proof mechanism 1 is fixed on the valve tube 3, a partition 301 is fixed inside the valve tube 3, a second air inlet 302 is opened above the front end of the partition 301 of the valve tube 3, a second air outlet 303 is opened above the end of the valve tube 3, the second air inlet 302 is connected to the front side of the front baffle 103, the second air outlet 303 is connected to the rear side of the rear baffle 104, and connectors 4 are fixedly connected at both ends of the valve tube 3.

[0035] The anti-leakage mechanism 1 includes a valve body 101, a movable chamber 102 is installed in the valve body 101 in a sealing and sliding manner, and the movable chamber 102 includes a front baffle 103 and a rear baffle 104. The front baffle 103 is set to a trapezoidal structure, the front baffle 103 is provided with a first air inlet 105, and the rear baffle 104 is provided with a first air outlet 106. A first spring 107 is connected between the valve body 101 and the rear baffle 104. The movable chamber 102 is provided with a sealing The blocking plate 108 is provided with an elastic rubber plate on one side of the blocking plate 108 close to the front baffle plate 103. The blocking plate 108 is connected to a pressure ring 110 through a second spring 109. The second spring 109 makes the blocking plate 108 stick to the inner side of the front baffle plate 103 in a natural state. A sliding rod 111 is fixedly connected to one side of the pressure ring 110. The other end of the sliding rod 111 is fixedly connected to the side wall of the valve body 101. The sliding rod 111 is sealingly and slidably connected to the rear baffle plate 104.

[0036] like Figure 2-4 As shown, when the self-closing valve is operating normally, the gas enters the valve body 101 through the connector 4. At this time, the gas pressure is balanced with the gas pressure. The first spring 107 pushes the movable chamber 102 to maintain a balance with the gas pressure. The movable chamber 102 cannot move. The gas pushes the sealing plate 108 through the first air inlet 105 to squeeze the second spring 109. At this time, the gas can enter normally from the first air inlet 103, then flow out from the first air outlet 106, and then flow out through the connector 4.

[0037] When the gas supply pressure in the gas pipeline is over-pressured, the gas enters the valve body 101 through the connector 4. At this time, the gas pressure is greater than the gas pressure. The gas pressure pushes the movable cavity 102 to squeeze the first spring 107, so that the first air inlet fits with the sealing plate 108 to achieve sealing. At this time, the gas cannot enter from the first air inlet 103.

[0038] When the gas supply pressure in the gas pipeline is underpressure, the gas enters the valve body 101 through the connector 4. At this time, the gas pressure is lower than the gas pressure, and the gas pressure cannot push the sealing plate 108. The first air inlet and the sealing plate 108 are in contact with each other to achieve sealing. At this time, the gas cannot enter from the first air inlet 103.

[0039] When gas leakage occurs in the gas pipeline, an obvious pressure difference occurs before and after the first gas outlet 106 of the mobile cavity 102. Under the action of the pressure difference, the mobile cavity 102 is further pushed to squeeze the first spring 107, so that the first gas inlet 103 fits with the sealing plate 108 to achieve sealing. At this time, the gas cannot enter from the first gas inlet 103, thereby achieving the function of timely and rapid closure to adapt to various situations, preventing large amounts of gas from leaking, and having the function of timely anti-leakage. The sensitivity of anti-leakage can be selected according to the elastic coefficient of the first spring 107.

[0040] Example 2

[0041] The present embodiment provides a leak-proof timed self-closing valve for a gas pipeline. Compared with a conventional self-closing valve in which timing and self-closing are completely independent, on the basis of Embodiment 1, the leak-proof timed self-closing valve also includes a timing mechanism 2. The timing mechanism 2 includes a timing assembly 21 and an escapement assembly 22. The bottom of the timing assembly 21 is connected to a wedge block 224 via a connecting rod 219. The connecting rod 219 is sealingly and slidingly connected to the top of the valve body 101. The wedge surface of the wedge block 224 is slidingly matched with the front baffle 103.

[0042] Among them, the timing assembly 21 includes a timing knob 210, a rotating rod 225 is fixedly connected to the bottom of the timing knob 210, the other end of the rotating rod 225 is fixedly connected to the top of the valve body 101, a first spur gear 213 is fixed to the upper part of the rotating rod 225, the first spur gear 213 is respectively meshed with a second spur gear 226 and a third spur gear 228, a first bevel gear 214 is fixedly connected below the second spur gear 226, the first bevel gear 214 is rotatably installed on the top of the valve body 101 through a rotating shaft, the first bevel gear 214 is meshed with a second bevel gear 215, the second bevel gear 215 is connected to a fourth spur gear 227, the fourth spur gear 227 is rotatably installed inside the support block 216 through a rotating shaft, the support block 216 is fixedly installed on the top of the valve body 101, and the fourth spur gear 227 is meshed with a rack 217.

[0043] Among them, an annular groove 211 is opened at the bottom of the timing knob, and a slider 212 is slidably installed inside the annular groove 211. The slider 212 is connected to the rack 217 through a telescopic rod. The end of the rack 217 is fixedly connected to the connecting rod 219. A third spring 218 is connected between the top of the rack 217 and the slider 212. The third spring 218 is sleeved on the telescopic rod. When the timing knob 210 returns to zero, the third spring 218 squeezes the rack 217 to make the wedge block 224 squeeze the front baffle 103, thereby making the front baffle 103 fit the sealing plate 108, and under the action of the third spring 218, the wedge block 224 always keeps fit with the front baffle 103.

[0044] Among them, the escapement assembly 22 includes an escapement wheel 220, which is rotatably installed on the top of the valve body 101 through a rotating shaft. The escapement wheel 220 is clamped with an escapement fork 221, and the escapement fork 221 is rotatably installed on the top of the valve body 101 through a rotating shaft. The tail of the escapement fork 221 is clamped with an impact pin 222, and the impact pin 222 is rotatably installed on the top of the valve body 101 through a rotating shaft. The bottom of the impact pin 222 is fixedly connected to one end of a coil spring 223, and the other end of the coil spring 223 is fixedly connected to the top of the valve body 101. A time scale is set on the outer peripheral side of the timing knob 210 at the top of the valve body 101.

[0045] like Figure 5-8As shown, when the self-closing valve is used, the wedge block 224 is in the initial position, the first air inlet 103 is in contact with the sealing plate 108, and the gas cannot pass through. The timing knob 210 is turned to rotate the pointer scale to the corresponding time scale. At this time, the timing knob 210 drives the gear 213 to rotate, the gear 213 drives the first bevel gear 214 to rotate, the gear 214 drives the second bevel gear 215 to rotate, the second bevel gear 215 drives the rack 217 to move upward, the rack 217 drives the wedge block 224 to move upward and squeezes the third spring 218 at the same time. At this time, the first spring 107 pushes the movable cavity 102 back to the initial position, and the gas can pass normally to achieve timing.

[0046] When the timing is completed, the third spring 218 pushes the rack 217 to move downward, and the rack 217 drives the second bevel gear 215 to rotate in the opposite direction. At the same time, the second bevel gear 215 drives the first bevel gear 214 to rotate, and the first bevel gear 214 drives the gear 213 to rotate, and the gear 213 drives the escapement wheel 220 to rotate. The exit fork on the right side of the escapement fork 211 blocks the escapement wheel 220, making the escapement wheel 220 unable to rotate, and other gears are also unable to rotate. At the same time, the inclined surface of the escapement wheel 220 impacts the exit fork on the right side of the escapement fork 211. The pallet fork 211 is provided with a certain kinetic energy, and the pallet fork 211 imparts the kinetic energy to the impact pin 222 through the plug, so that the impact pin 222 swings back and forth. After the swing, the impact pin 222 stores a certain elastic force in the coil spring 223, and starts to swing back, driving the impact pin 222 to hit the plug of the pallet fork 211, so that the escapement wheel 220 is freed from the restriction of the pallet fork 221, and at the same time drives the pallet fork 211 to deflect, so that the left exit fork of the pallet fork 211 clamps the escapement wheel 220, and the back and forth swing of the pallet fork 211 keeps the overall rotation speed of the gear unchanged.

[0047] The anti-leakage self-closing valve of the present invention is not timed. At this time, the wedge block 224 is in the initial position, the first air inlet 103 is in contact with the sealing plate 108, and the gas cannot pass through. The timing knob 210 is rotated to rotate the pointer scale to the corresponding time scale. At this time, the timing knob 210 drives the gear 213 to rotate, the gear 213 drives the first bevel gear 214 to rotate, the gear 214 drives the second bevel gear 215 to rotate, the second bevel gear 215 drives the rack 217 to move upward, the rack 217 drives the wedge block 224 to move upward and squeezes the third spring 218 at the same time. At this time, the first spring 107 pushes the movable chamber 102 back to the initial position, and the gas can pass normally to achieve timing.

[0048] When the timing is completed, the third spring 218 pushes the rack 217 to move downward, and the rack 217 drives the second bevel gear 215 to rotate in the opposite direction. At the same time, the second bevel gear 215 drives the first bevel gear 214 to rotate, and the first bevel gear 214 drives the gear 213 to rotate. The gear 213 drives the escapement wheel 220 to rotate. The exit fork on the right side of the escapement fork 211 blocks the escapement wheel 220, making the escapement wheel 220 unable to rotate, and other gears are also unable to rotate. At the same time, the inclined surface of the teeth of the escapement wheel 220 impacts the right side of the escapement fork 211. The exit fork gives a certain kinetic energy to the escapement fork 211, and the escapement fork 211 imparts the kinetic energy to the impact pin 222 through the plug, causing the impact pin 222 to swing back and forth. After the swing, the impact pin 222 stores a certain elastic force in the coil spring 223, and begins to swing back, driving the impact pin 222 to hit the plug of the escapement fork 211, so that the escapement wheel 220 is freed from the restriction of the escapement fork 221, and at the same time drives the escapement fork 211 to deflect, so that the exit fork on the left side of the escapement fork 211 clamps the escapement wheel 220. Through the back and forth swing of the escapement fork 211, the overall rotation speed of the gear remains unchanged.

[0049] When the timing ends, the wedge block 224 returns to the initial position, the first air inlet is in contact with the sealing plate 108, the gas cannot pass through, and the self-closing valve is closed, avoiding the possibility of fire caused by forgetting to turn off the fire when using the gas stove.

[0050] It should be noted that when the pipeline air pressure is normal, the third spring 218 and the coil spring 223 maintain a balance in the potential energy of the first spring 107, that is, in the untiming state, the wedge block 224 is in the initial position, the first air inlet 103 is in contact with the sealing plate 108, and the gas cannot pass through; after timing, due to the upward movement of the wedge block 224, the movable cavity 102 moves to the left under the action of the first spring 107, thereby causing the front baffle 103 and the sealing plate 108 to be out of contact, and the gas passes through.

[0051] When the gas pipeline supply pressure is over-pressured, in the untimed state, the gas valve is in a closed state. It is only necessary to turn the timing knob 210 to move the wedge block 224 upward to restore the gas supply for a smaller over-pressure in case of emergency. However, in the case of a larger over-pressure, the strong pressure difference will cause the movable cavity 102 to move directly to the right and fit the sealing plate 108. It can only be used normally after the pipeline gas pressure returns to normal.

[0052] Similarly, when the gas pipeline supply pressure is underpressure, if the underpressure is small, it is only necessary to turn the timing knob 210 to move the wedge block 224 upward to restore the gas supply to a smaller overpressure in case of emergency. However, in the case of a large underpressure, even if the knob 210 is turned, the sealing plate 108 will be attached to the inner side of the front baffle 103 under the action of the second spring 109, and ventilation will be impossible. It can only be used normally after the pipeline air pressure returns to normal.

[0053] However, if a gas pipeline leaks, a strong pressure difference will occur before and after the first gas outlet 106 of the movable chamber 102. Under the action of the pressure difference, the movable chamber 102 is further pushed to squeeze the first spring 107, so that the first gas inlet 103 fits with the sealing plate 108. Even if the knob 210 is turned and the wedge block 224 moves up, the movable chamber 102 will move to the right under the action of the pressure difference, and then the front baffle 103 fits with the sealing plate 108, and the gas cannot pass through, thereby preventing leakage.

[0054] Compared with the traditional timed self-closing valve in which the timing and self-closing valves are completely separated, the present invention can effectively ventilate slight overpressure or underpressure through timing to prepare for emergency needs, and due to the effect of timing, it can automatically close in such an emergency state to avoid hidden dangers, and can remain closed in the event of a gas leak, thereby achieving a better anti-leakage effect.

[0055] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A gas pipeline anti-leakage timed self-closing valve, characterized in that: It includes an anti-leakage mechanism, a timing mechanism and a valve tube, wherein the timing mechanism is arranged above the anti-leakage mechanism, the anti-leakage mechanism is fixed on the valve tube, and connectors are fixedly connected at both ends of the valve tube; The anti-leakage mechanism comprises a valve body, a movable cavity is sealingly and slidably installed inside the valve body, the movable cavity comprises a front baffle and a rear baffle, the front baffle is arranged in a trapezoidal structure, the front baffle is provided with a first air inlet, the rear baffle is provided with a first air outlet, a first spring is connected between the valve body and the rear baffle, a blocking plate is arranged inside the movable cavity, the blocking plate is connected with a pressure ring through a second spring, a sliding rod is fixedly connected to one side of the pressure ring, the other end of the sliding rod is fixedly connected to the side wall of the valve body, and the sliding rod is sealingly and slidably connected to the rear baffle; The timing mechanism comprises a timing assembly and an escapement assembly. The bottom of the timing assembly is connected to a wedge block via a connecting rod. The connecting rod is sealingly and slidingly connected to the top of the valve body. The wedge surface of the wedge block is slidably matched with the front baffle.

2. The anti-leakage timed self-closing valve for a gas pipeline according to claim 1, characterized in that: The second spring makes the blocking plate abut against the inner side of the front baffle in a natural state.

3. The anti-leakage timed self-closing valve for a gas pipeline according to claim 1, characterized in that: A partition is fixed inside the valve tube, a second air inlet is opened above the front end of the partition, and a second air outlet is opened above the end of the valve tube.

4. The anti-leakage timed self-closing valve for a gas pipeline according to claim 3, characterized in that: The second air inlet is communicated with the front side of the front baffle, and the second air outlet is communicated with the rear side of the rear baffle.

5. The anti-leakage timed self-closing valve for a gas pipeline according to claim 1, characterized in that: The timing assembly includes a timing knob, a rotating rod fixedly connected to the bottom of the timing knob, the other end of the rotating rod is fixedly connected to the top of the valve body, a first spur gear is fixed to the upper part of the rotating rod, the first spur gear is respectively meshed with a second spur gear and a fourth spur gear, a first bevel gear is fixedly connected below the second spur gear, the first bevel gear is rotatably installed on the top of the valve body via a rotating shaft, the first bevel gear is meshed with a second bevel gear, the second bevel gear is connected to a third spur gear, the third spur gear is rotatably installed inside a support block via a rotating shaft, the support block is fixedly installed on the top of the valve body, and the third spur gear is meshed with a rack.

6. The anti-leakage timed self-closing valve for a gas pipeline according to claim 5, characterized in that: An annular groove is provided at the bottom of the timing knob, a slider is slidably installed inside the annular groove, the slider is connected to the rack through a telescopic rod, the end of the rack is fixedly connected to the connecting rod, and a third spring is connected between the top of the rack and the slider.

7. The anti-leakage timed self-closing valve for a gas pipeline according to claim 6, characterized in that: When the timing knob returns to zero, the third spring presses the rack to make the wedge-shaped block press the front baffle, thereby making the front baffle fit the blocking plate.

8. The anti-leakage timed self-closing valve for a gas pipeline according to claim 1, characterized in that: The escapement assembly includes an escapement wheel, which is rotatably mounted on the top of the valve body via a rotating shaft, the escapement wheel is clamped with an escapement fork, and the escapement fork is rotatably mounted on the top of the valve body via a rotating shaft, the tail of the escapement fork is clamped with an impact pin, and the impact pin is rotatably mounted on the top of the valve body via a rotating shaft, the bottom of the impact pin is fixedly connected to one end of a coil spring, and the other end of the coil spring is fixedly connected to the top of the valve body.

9. The anti-leakage timed self-closing valve for a gas pipeline according to claim 1, characterized in that: The top of the valve body is provided with a time scale on the outer peripheral side of the timing knob.

10. The anti-leakage timed self-closing valve for a gas pipeline according to claim 1, characterized in that: An elastic rubber plate is arranged on one side of the blocking plate close to the front baffle.

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