A safety shut-off device for natural gas delivery

Abstract

The present application relates to a kind of natural gas conveying safety cut-off device, belong to natural gas conveying technical field, including several conveying pipelines, shell, cut-off component being arranged in shell, between adjacent two conveying pipelines are connected by safety valve, the both ends of shell are respectively arranged on the pipe wall of adjacent two conveying pipelines, by setting cut-off component in shell, so that the outer surface of one end of gas flow passage is wrapped in the connection place of safety valve and conveying pipeline, spiral rotating part is tee structure, the other end of gas flow passage is rotatably connected with branch pipe in tee structure, the both ends of cam rocker are respectively connected with the branch pipe wall in tee structure and the valve of safety valve, leaked gas is rotated by driving spiral rotating part, so that this natural gas conveying safety cut-off device can be quickly sensed in the first time of natural gas leakage, then according to the speed of natural gas leakage to control the closing degree of valve, reduce the harm to human body and economic loss.

Description

Technical Field

[0001] This invention belongs to the field of natural gas transmission technology, and specifically relates to a natural gas transmission safety shut-off device. Background Technology

[0002] Natural gas is found in porous underground rock formations, including oilfield gas, gas field gas, coalbed methane, mud volcano gas, and biogenic gas, with a small amount also found in coal seams. It is a high-quality fuel and chemical raw material. The main use of natural gas is as fuel, and it can be used to manufacture carbon black, chemicals, and liquefied petroleum gas. Currently, natural gas is transported through several pipelines, with adjacent pipelines connected by safety valves. However, leaks are prone to occur at these safety valve connections, which can easily cause harm or economic losses. Therefore, most natural gas pipelines are now equipped with automatic natural gas safety shut-off devices at their safety valve connections. These devices automatically cut off the gas supply when a leak is detected, thus preventing economic losses.

[0003] For example, patent application number CN202222065447.X discloses an automatic safety shut-off device for natural gas transportation. With the help of a spring telescopic rod and a pressure plate, when natural gas leaks from the safety valve, the natural gas will enter the first and second housings. Under the action of the first spring telescopic rod, the pressure plate is squeezed and then squeezes the valve button group. The valve button group will control the first valve in the first and second natural gas pipelines to close, and the second valve in the backup pipeline will open, so that the natural gas can be transported normally. This achieves the effect of automatically shutting off the safety valve without affecting the use of natural gas.

[0004] However, the aforementioned patent still has some problems in natural gas transportation: due to the reaction force of the spring in the telescopic rod, when natural gas first starts to leak from the safety valve, the first telescopic rod will not squeeze the pressure plate. At this time, the natural gas will only enter the first and second housings first. As the amount of natural gas in the first and second housings gradually increases, the overall pressure also gradually increases. After a period of time, until the gas pressure in the first housing is greater than the reaction force of the spring, the leaking natural gas can then be used as power to drive the first telescopic rod to squeeze the pressure plate and then squeeze the valve button assembly. Therefore, the existing technology using this mechanism cannot quickly sense the natural gas leak at the first moment and then control the degree of valve closure according to the speed of the natural gas leak, thus reducing harm to the human body and economic losses. Therefore, a natural gas transportation safety shut-off device is proposed. Summary of the Invention

[0005] To address the aforementioned problems in the prior art, this invention provides a natural gas transmission safety shut-off device, which solves the problem that existing natural gas transmission safety shut-off devices cannot quickly detect natural gas leaks at the first moment and control the degree of valve closure based on the speed of the leak.

[0006] The objective of this invention can be achieved through the following technical solution: a natural gas transmission safety shut-off device, comprising a plurality of transmission pipelines, a housing, and a shut-off assembly disposed within the housing, wherein the plurality of transmission pipelines are connected end to end, and adjacent transmission pipelines are connected by a safety valve, wherein the two ends of the housing are respectively disposed on the pipe walls of two adjacent transmission pipelines, and a sealed body is formed between the housing and the pipe walls of two adjacent transmission pipelines, and the safety valve is located within the sealed body;

[0007] The shut-off assembly includes a gas flow section, a spiral rotating section for sensing natural gas leaks, and a cam rocker section. One end of the gas flow section is wrapped around the outer surface of the connection between the safety valve and the delivery pipeline. The spiral rotating section is a three-way structure, and the other end of the gas flow section is rotatably connected to a branch pipe in the three-way structure. The two ends of the cam rocker section are respectively connected to the wall of the branch pipe in the three-way structure and the valve of the safety valve. The leaked gas drives the spiral rotating section to rotate, which in turn drives the cam of the cam rocker section to move. The rocker of the cam rocker section drives the valve of the safety valve to partially or fully close.

[0008] As a further embodiment of the present invention, the cam rocker arm includes a rotating wheel and a rocker arm, one end of the rocker arm is disposed at the eccentricity of the rotating wheel, the rocker arm and the rotating wheel form a cam structure, and the other end of the rocker arm is connected to the valve of the safety valve.

[0009] As a further embodiment of the present invention, the main pipe of the spiral rotating part has an S-shaped structure, and the other end of the gas flow part is rotatably connected to the center of the branch pipe in the three-way structure.

[0010] As a further embodiment of the present invention, an anti-rebound mechanism is provided between the valve of the safety valve and the rocker arm of the cam rocker arm. The anti-rebound mechanism includes a ratchet connected to the valve of the safety valve and a pawl disposed on the housing and engaged with the ratchet. The rocker arm of the cam rocker arm drives the ratchet to rotate, and the ratchet drives the valve of the safety valve to move.

[0011] As a further aspect of the present invention, an elastic buffer is provided between the rocker arm and the ratchet of the cam rocker arm to prevent misjudgment of the helical rotation part.

[0012] As a further embodiment of the present invention, a sealing gasket for preventing air leakage is provided between one end of the gas flow section and the outer surface of the connection between the safety valve and the delivery pipeline.

[0013] As a further embodiment of the present invention, the housing is provided with an infrared sensor for monitoring the rotation of the spiral rotating part, and the infrared sensor is externally connected to a control system.

[0014] As a further embodiment of the present invention, the housing is also provided with a buzzer, which is communicatively connected to an infrared sensor.

[0015] As a further embodiment of the present invention, the other end of the gas flow section is rotatably connected to the branch pipe in the three-way structure via a bearing.

[0016] As a further embodiment of the present invention, a gas seal is provided between the bearing and the gas flow section and the branch pipe in the tee structure.

[0017] The beneficial effects of this invention are as follows:

[0018] By incorporating a shut-off assembly within the housing, one end of the gas flow section is wrapped around the outer surface of the connection between the safety valve and the delivery pipeline. The spiral rotating part is a three-way structure, with the other end of the gas flow section rotatably connected to a branch pipe within the three-way structure. The two ends of the cam rocker are respectively connected to the wall of the branch pipe in the three-way structure and the valve of the safety valve. When natural gas leaks, the leaking gas drives the spiral rotating part to rotate, which in turn drives the cam of the cam rocker to move. The rocker of the cam rocker then partially or fully closes the valve of the safety valve. This allows the natural gas delivery safety shut-off device to quickly detect natural gas leaks at the first moment and then control the degree of valve closure based on the rate of leakage, reducing harm to human health and economic losses. Attached Figure Description

[0019] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the cam rocker arm structure of the present invention;

[0022] Figure 3 This is a side view of the cutting component of the present invention.

[0023] Explanation of key component symbols:

[0024] In the diagram: 1. Delivery pipe; 2. Shell; 3. Safety valve; 4. Cut-off assembly; 41. Gas flow section; 42. Screw rotation section; 43. Cam rocker section; 431. Rotating wheel; 432. Rocker arm; 433. Limiting rod; 5. Sealing gasket; 6. Bearing; 7. Ratchet; 8. Pawl. Detailed Implementation

[0025] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0026] Please see Figure 1-3 This embodiment provides a natural gas transmission safety shut-off device, including several transmission pipes 1, a housing 2, and a shut-off assembly 4 disposed within the housing 2. The several transmission pipes 1 are connected end to end, and adjacent transmission pipes 1 are connected by a safety valve 3. The two ends of the housing 2 are respectively disposed on the pipe walls of two adjacent transmission pipes 1. The housing 2 actually includes an upper housing 2 and a lower housing 2, and the upper housing 2 and the lower housing 2 are connected by a snap-fit ​​mechanism, which can both ensure that the upper housing 2 and the lower housing 2 can be disassembled, and also ensure that the housing 2 and the pipe walls of the two adjacent transmission pipes 1 form a sealed body, resulting in a better sealing effect. The safety valve 3 is then disposed within the sealed body. The shut-off assembly 4 includes a gas flow section 41, a spiral rotating section 42 for sensing natural gas leaks, and a cam rocker section 43. One end of the gas flow section 41 is wrapped around the outer surface of the connection between the safety valve 3 and the transmission pipe 1. The spiral rotating section 42 is a three-way structure, which is further divided into a branch pipe and a main pipe. The other end of the gas flow section 41 is rotatably connected to the branch pipe in the three-way structure. The two ends of the cam rocker arm 43 are connected to the branch pipe wall in the three-way structure and the valve of the safety valve 3, respectively. Leaking gas drives the rotating screw 42 to rotate, which in turn drives the cam of the cam rocker arm 43 to move. The rocker arm 432 of the cam rocker arm 43 drives the safety valve 3 to partially or fully close. Here, "partially or fully closed" actually means that the rocker arm 432 of the cam rocker arm 43 drives the safety valve 3 to gradually close. If the leaked gas is small, the degree of closure of the safety valve 3 is small; if the leaked gas is large, the degree of closure of the safety valve 3 is large. This design is because the safety valve 3 also has a sealed body formed between the housing 2 and the outer wall of the delivery pipe 1. If the valve were to close completely immediately when the amount of natural gas leaked is too small, and people urgently need to continue using the gas, it would prevent them from continuing to use it. Therefore, this design allows the degree of valve closure to be controlled according to the rate of natural gas leakage.

[0027] The control system mentioned below, in actual use, is connected to the mechanical shut-off assembly 4 at the housing 2. The description of the control system in this article is only to clarify how the control system and the shut-off assembly 4 cooperate, and will not interfere with the specific implementation of the control system on the shut-off assembly 4. In this regard, a buzzer is also installed on the housing 2. The buzzer is connected to the control system. When natural gas leaks, regardless of the size of the leak, the buzzer will sound to remind the staff to come and carry out maintenance. This not only does not affect people's use of natural gas, but also allows the staff to quickly know where the natural gas pipeline has a problem.

[0028] In current automatic shut-off devices for natural gas transmission safety, the spring in the telescopic rod has a reaction force. Therefore, when natural gas begins to leak from safety valve 3, the first telescopic rod will not press the pressure plate. At this time, the natural gas will only enter the first housing 2 and the second housing 2. As the amount of natural gas in the first housing 2 and the second housing 2 gradually increases, the overall pressure also gradually increases. After a period of time, when the gas pressure in the first housing 2 exceeds the reaction force of the spring, the leaking natural gas can then be used as power to drive the first telescopic rod to press the pressure plate and then the valve button assembly. Therefore, the existing technology using this mechanism cannot quickly sense the natural gas leak at the first moment and then control the valve closure degree according to the speed of the natural gas leak, thus reducing harm to the human body and economic losses.

[0029] To address the aforementioned issues, in this embodiment, several delivery pipes 1 are first connected end-to-end, and adjacent delivery pipes 1 are connected by a safety valve 3. Then, a cut-off assembly 4 is installed in the housing 2, so that one end of the gas flow section 41 is wrapped around the outer surface of the connection between the safety valve 3 and the delivery pipe 1. The spiral rotating part 42 is a three-way structure, and the other end of the gas flow section 41 is rotatably connected to the branch pipe in the three-way structure. The two ends of the cam rocker part 43 are respectively connected to the wall of the branch pipe in the three-way structure and the valve of the safety valve 3. When natural gas leaks, the leaked gas drives the spiral rotating part 42 to rotate, which in turn drives the cam of the cam rocker part 43 to move. The rocker arm 432 of the cam rocker part 43 drives the valve of the safety valve 3 to partially or completely close. This allows the natural gas delivery safety cut-off device to quickly detect natural gas leaks at the first moment, and then control the degree of valve closure according to the speed of natural gas leakage, reducing harm to the human body and economic losses.

[0030] Furthermore, to ensure that the rocker arm 432 of the cam rocker arm section 43 can better drive the valve of the safety valve 3 to partially or fully close, in one embodiment, the cam rocker arm section 43 includes a rotating wheel 431 and a rocker arm 432. One end of the rocker arm 432 is located at the eccentricity of the rotating wheel 431, and the rocker arm 432 and the rotating wheel 431 form a cam structure. The other end of the rocker arm 432 is connected to the valve of the safety valve 3. Here, the rocker arm 432 will not interfere with the helical rotating part 42 because the rotating wheel 431 does not need to rotate one revolution, and it is necessary to ensure that the rocker arm 432 is connected to the valve of the safety valve 3 when the rotating wheel 431 rotates. One end needs to move in one direction continuously because, under normal circumstances, the rotating wheel 431 does not rotate one revolution, and the rocker arm 432 needs to move back and forth. Here, only one-way reciprocating motion is required. Furthermore, to ensure accuracy, the actual distance selected should be less than the one-way reciprocating motion distance. Therefore, if the error here is too large, exceeding the one-way travel distance will prevent the safety valve 3 from fully closing. In addition, to prevent the rocker arm 432 from changing direction arbitrarily during movement, a limit rod 433 is slidably installed on the housing 2 to restrict the movement of the rocker arm 432, ensuring that the rocker arm 432 can only move in a straight line. Figure 2 As shown.

[0031] In order to better drive the spiral rotating part 42 to rotate when the gas passes through it, in one embodiment, the main pipe of the spiral rotating part 42 is an S-shaped structure, and the other end of the gas flow part 41 is rotatably connected to the center of the branch pipe in the three-way structure. Here, it is necessary to limit the main pipe of the spiral rotating part 42 to an S-shaped structure so that the gas flows through the main pipe and vibrates the main pipe, thereby causing the main pipe to rotate. If it is a straight pipe, the sensitivity will be much lower than that of the S-shaped structure.

[0032] Because the safety valve 3 is controlled by the rotation of the main pipe of the gas-driven spiral rotating part 42, which in turn drives the rotating wheel 431 of the cam rocker arm part 43 to rotate, and the rotating wheel 431 drives the rocker arm 432 to move, thereby closing the safety valve 3. However, after the safety valve 3 is closed, if the natural gas leakage rate changes, the safety valve 3 may spring back, preventing it from closing automatically and securely. To solve this problem...

[0033] In one embodiment, an anti-rebound mechanism is provided between the valve of the safety valve 3 and the rocker arm 432 of the cam rocker arm 43. The anti-rebound mechanism includes a ratchet 7 connected to the valve of the safety valve 3 and a pawl 8 disposed on the housing 2 and meshing with the ratchet 7. The rocker arm 432 of the cam rocker arm 43 drives the ratchet 7 to rotate, and the ratchet 7 drives the valve of the safety valve 3 to move. Through the cooperation of the ratchet 7 and the pawl 8, once the valve of the safety valve 3 is closed, natural gas cannot continue to flow and can only be opened manually by subsequent personnel, making the cut-off of natural gas supply safer and more reliable. Since the direction of movement of the rocker arm 432 is different from the direction of movement of the ratchet 7, the direction of rotation can be changed by a gear and rack, so that the rocker arm 432 slides and drives the ratchet 7 to rotate. This is not shown in the figure to avoid too many lines affecting the view.

[0034] Furthermore, considering that natural gas leaks during transportation can be continuous, but when the natural gas pipeline 1 experiences significant vibration due to external force or is touched by a person, causing the spiral rotating part 42 to rotate, the rocker arm 432 of the cam rocker arm 43 can easily drive the ratchet 7 to rotate. Once the ratchet 7 rotates, it will cause the valve to close slightly, requiring manual reset. To solve this problem, in one embodiment, an elastic buffer is provided between the rocker arm 432 of the cam rocker arm 43 and the ratchet 7 to prevent the spiral rotating part 42 from misjudging. When the natural gas pipeline 1 experiences significant vibration due to external force or is touched by a person, causing the spiral rotating part 42 to rotate, the rocker arm 432 of the cam rocker arm 43 will first squeeze the elastic buffer. Since the force of the human touch disappears instantly, when the vibration force disappears, the rocker arm 432 of the cam rocker arm 43 will reset under the action of the elastic buffer. During this process, the ratchet 7 does not move, and it will not cause the valve to close slightly.

[0035] Since natural gas leaks typically occur at the connection between the safety valve 3 and the delivery pipeline 1, to better ensure that all leaked gas flows directly out through the gas flow section 41 for easier monitoring, in one embodiment, a sealing gasket 5 is provided between one end of the gas flow section 41 and the outer surface of the connection between the safety valve 3 and the delivery pipeline 1 to prevent leakage. The sealing gasket 5 can prevent leaked gas from leaking out from the connection between the safety valve 3 and the delivery pipeline 1. Furthermore, the sealing gasket 5 can be made of silicone, because the absorbency of silicone can improve the sealing effect at the connection between the safety valve 3 and the delivery pipeline 1.

[0036] In addition, in the natural gas transmission safety shut-off device, besides the mechanical structure, a certain control system is also needed to ensure that the mechanical structure can control the safety valve 3 at the moment of natural gas leakage. At the same time, the control system can notify the staff so that they can deal with the situation quickly. In this regard, an infrared sensor for monitoring the rotation of the spiral rotating part 42 is provided on the housing 2. The infrared sensor is connected to the control system. In addition, a buzzer is also provided on the housing 2. The buzzer is communicatively connected to the infrared sensor. The infrared sensor monitors the rotation of the spiral rotating part 42. That is, when the spiral rotating part 42 moves, the infrared sensor detects the movement of the spiral rotating part 42 and transmits the signal to the terminal of the control system. The terminal of the control system then controls the buzzer to sound to remind the staff.

[0037] In practical use, if the spiral rotating part 42 is to rotate as soon as natural gas leaks, the friction between the spiral rotating part 42 and the other end of the gas flow part 41 needs to be very small. In this regard, in one embodiment, the other end of the gas flow part 41 is rotatably connected to the branch pipe in the three-way structure through a bearing 6. Different bearings 6 can be used as needed. The higher the sensitivity of the bearing 6, the higher the detection degree of the spiral rotating part 42 for natural gas leaks. The mechanical structure used here is less difficult to design than a purely electronic control system.

[0038] When natural gas leaks, the gas flows through the gas flow section 41 and drives the spiral rotating part 42 to rotate. However, considering that after long-term use, there may be air leakage between the bearing 6, the gas flow section 41, and the branch pipe in the three-way structure, the gas pressure passing through the gas flow section 41 will become too low, which will easily reduce the rotation power of the spiral rotating part 42 and increase the difficulty of closing the safety valve 3. To solve this problem, in one embodiment, a gas seal is provided between the bearing 6, the gas flow section 41, and the branch pipe in the three-way structure. The gas seal can ensure that there is no air leakage between the bearing 6, the gas flow section 41, and the branch pipe in the three-way structure, so that the gas pressure passing through the gas flow section 41 will not become too low. In addition, this design is based on the structural cooperation between the gas flow section 41 and the spiral rotating part 42. As long as there is no air leakage between the bearing 6, the gas flow section 41, and the branch pipe in the three-way structure, the spiral rotating part 42 will not be difficult to rotate.

[0039] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A natural gas transmission safety shut-off device, characterized in that, It includes several conveying pipes, a housing, and a cutting-off assembly disposed within the housing. The several conveying pipes are connected end to end, and adjacent conveying pipes are connected by a safety valve. The two ends of the housing are respectively disposed on the pipe walls of two adjacent conveying pipes, and a sealed body is formed between the housing and the pipe walls of two adjacent conveying pipes. The safety valve is located within the sealed body. The shut-off assembly includes a gas flow section, a spiral rotating section for sensing natural gas leaks, and a cam rocker section. One end of the gas flow section is wrapped around the outer surface of the connection between the safety valve and the delivery pipeline. The spiral rotating section is a three-way structure. The other end of the gas flow section is rotatably connected to a branch pipe in the three-way structure. The two ends of the cam rocker section are respectively connected to the wall of the branch pipe in the three-way structure and the valve of the safety valve. The leaked gas drives the spiral rotating section to rotate, which in turn drives the cam of the cam rocker section to move. The rocker of the cam rocker section drives the valve of the safety valve to partially or fully close. The main pipe of the spiral rotating part has an S-shaped structure, and the other end of the gas flow part is rotatably connected to the center of the branch pipe in the three-way structure. An anti-rebound mechanism is provided between the valve of the safety valve and the rocker arm of the cam rocker arm. The anti-rebound mechanism includes a ratchet connected to the valve of the safety valve and a pawl provided on the housing and meshing with the ratchet. The rocker arm of the cam rocker arm drives the ratchet to rotate, and the ratchet drives the valve of the safety valve to move. An elastic buffer is provided between the rocker arm and the ratchet of the cam rocker arm to prevent misjudgment by the helical rotation part.

2. The natural gas transmission safety shut-off device according to claim 1, characterized in that, The cam rocker arm includes a rotating wheel and a rocker arm. One end of the rocker arm is located at the eccentricity of the rotating wheel, and the rocker arm and the rotating wheel form a cam structure. The other end of the rocker arm is connected to the valve of the safety valve.

3. A natural gas transmission safety shut-off device according to claim 1, characterized in that, A sealing gasket is provided between one end of the gas flow section and the outer surface of the connection between the safety valve and the delivery pipeline to prevent gas leakage.

4. A natural gas transmission safety shut-off device according to claim 1, characterized in that, The housing is equipped with an infrared sensor for monitoring the rotation of the spiral rotating part, and the infrared sensor is connected to an external control system.

5. A natural gas transmission safety shut-off device according to claim 4, characterized in that, The housing is also equipped with a buzzer, which is communicatively connected to an infrared sensor.

6. A natural gas transmission safety shut-off device according to claim 1, characterized in that, The other end of the gas flow section is rotatably connected to the branch pipe in the tee structure via a bearing.

7. A natural gas transmission safety shut-off device according to claim 6, characterized in that, Gas seals are provided between the bearing and the gas flow section and the branch pipe in the tee structure.

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