Stop valve with automatic alarm function

Abstract

The invention relates to the technical field of valve leakage alarm, in particular to a stop valve with an automatic alarm function, which comprises a stop valve arranged in a valve well and alarm mechanisms respectively arranged at the edges of flange interfaces at the two ends of the stop valve, the detection base is composed of a base plate and an extension plate which are integrally and fixedly connected, inner cavities of the base plate and the extension plate are communicated, a detection module is arranged on the detection base and comprises a plurality of detection rods located at the edge position of the outer circle face of the base plate, and a microphone is arranged in each detection rod. Collected leakage noise is amplified through a plurality of microphones distributed in an array mode, amplified signals are received through a noise sensor, an alarm is triggered, vibration signals are received through an acceleration sensor, and then the alarm is triggered. A monitoring platform of a natural gas pipeline network system judges whether leakage occurs or not through the two variables of the sound signal and the vibration signal, and the accuracy of leakage detection of the alarm mechanism is improved.

Description

Technical Field

[0001] The invention relates to the technical field of valve leakage alarm, in particular to a stop valve with an automatic alarm function. Background Art

[0002] Stop valves are widely used in water, oil, natural gas and other pipelines to control the flow status of these media. In order to facilitate the opening and closing of part of the pipeline network or maintenance work, valve wells are generally set at the stop valves of the pipeline. If a stop valve used in a natural gas pipeline leaks, it will waste energy at the least and cause a safety accident at the worst. Since many pipelines in the natural gas pipeline system are often buried in underground and other hidden areas, once a leak occurs, it is usually difficult to detect except for regular manual inspections.

[0003] Valve leakage generally occurs at the connection surface between the valve and the pipeline. The traditional leakage detection method is that the inspectors regularly use detection instruments to conduct on-site detection, which is difficult to detect and maintain in time. Some stop valves in the prior art have alarm functions, but the alarm mechanism of the existing valve is generally fixed on the valve body. However, since the decibel of sound generated when the pipeline valve for transporting natural gas leaks will be affected by factors such as the location, size and shape of the leak point, the fixed alarm mechanism has a high misjudgment rate. However, in order to accurately judge whether a leak occurs, some alarm mechanisms often set multiple sound sensors in the alarm mechanism to monitor the sound generated by the leak, which is costly. Summary of the invention

[0004] Technical Solution To achieve the above object, the present invention provides the following technical solutions: a stop valve with automatic alarm function, comprising a stop valve arranged in a valve well and alarm mechanisms respectively arranged at the edges of flange interfaces at both ends of the stop valve, the alarm mechanism comprising two detection bases butted up and down, the detection base consisting of a base plate and an extension plate which are integrally fixedly connected and whose internal cavities are interconnected; The detection base is provided with a detection module for leak detection, including a plurality of detection rods arranged at the edge of the outer circular surface of the substrate, each detection rod is provided with a microphone inside, and the outer surface of each detection rod is provided with a row of sound transmission holes close to the microphone head; The detection base is also provided with a sound signal receiving module, including a noise sensor and an acceleration sensor installed on the extension plate; The interior of the detection base is provided with a driving component for controlling the movement of the detection rod, including a magnetic attraction part installed on the cavity wall on one side of the substrate, and the same number of limit rods as the detection rods are arranged on the opposite surfaces of the substrate and the extension plate cavity. A push-pull rod is movably hinged on the outer surface of the detection rod, and the other end of the push-pull rod is movably connected to an adsorption block that is slidably sleeved on the limit rod.

[0005] Preferably, the two upper and lower butted detection bases are fixed by bolts, and the connection surfaces of the upper and lower detection bases are provided with electrical connection interfaces, so that the upper and lower butted detection bases are electrically connected.

[0006] Preferably, the base plate and the extension plate are both annular structures with the same inner diameter, the outer diameter of the base plate is larger than the outer diameter of the extension plate so that the two form an arc-shaped stepped structure, and a plurality of notches are equidistantly provided at the edge of the outer circular surface of the base plate.

[0007] Preferably, the number of the several detection rods and the notch are the same and their positions correspond inside and outside, each detection rod is movably hinged to the base plate, one end of the detection rod extends to the outside of the end face of the stop valve flange interface, and the detection rod is a plastic rod with a cylindrical structure.

[0008] Preferably, a plurality of notches 2 are equidistantly provided on the edge of the outer circumferential surface of the extension plate, and the number of notches 2 is the same as that of notches 1 and their positions correspond to each other on the left and right.

[0009] Preferably, the push-pull rod is tilted and a spring is fixedly connected to its top inclined surface, the other end of the spring is tilted upward and fixedly connected to the inner wall of the cavity of the substrate, and a part of the push-pull rod and the spring movably passes through the second notch.

[0010] Preferably, the noise sensor is a CRY2110 noise sensor, using an RS-485 bus interface as a data communication port; The acceleration sensor is a piezoelectric acceleration sensor. Both the noise sensor and the acceleration sensor can be installed at any reasonable position on the extension plate, and the two are connected to the same controller.

[0011] Preferably, the detection base is also provided with a power module, including a lithium battery pack electrically connected to the magnetic attraction component, the magnetic attraction component is mainly an electromagnet, and the adsorption block is an "L"-shaped iron block.

[0012] Preferably, the detection base is further provided with a communication module, including a NB device electrically connected to the lithium battery pack, and both the noise sensor and the acceleration sensor are communicatively connected to the NB device.

[0013] Preferably, the detection base is also provided with an alarm module, including an alarm electrically connected to the communication module, so that the alarm signal is transmitted to the monitoring platform through the NB device.

[0014] Beneficial Effects Compared with the prior art, the present invention provides a stop valve with automatic alarm function, which has the following beneficial effects: By installing an alarm mechanism on the stop valve, a number of detection rods are arranged at the connection surface of the stop valve and the pipeline according to an equidistant array to monitor the leakage signal. When natural gas leaks from the connection surface, on the one hand, the connection surface will emit airflow sound to form a first noise, and the airflow acts on any detection rod to generate vibration to form a second noise. The first noise and the second noise collected are amplified by the microphone inside the detection rod, so that the noise sensor can receive the amplified sound more sensitively and accurately and alarm, further improving the sensitivity of the alarm mechanism; On the other hand, when the airflow acts on any detection rod to generate vibration, the acceleration sensor receives the vibration signal and triggers the alarm module to alarm. The monitoring platform of the natural gas pipeline system uses the two variables of sound signal and vibration signal to determine whether a leak occurs, thereby improving the accuracy of the alarm mechanism's leak detection. A microphone is set in each of the several detection rods to amplify the sound generated when leaking, which can not only collect the sound signals generated in an all-round way, but also only needs to set up a noise sensor to receive all these amplified sound signals, which has the advantage of saving costs; By setting several detection rods as a dynamic monitoring form with a timed cycle, the microphone inside the detection rod can be moved in multiple directions in a cycle. Not only can the sound produced by leakage points of different positions, sizes and shapes be collected, the effect of multiple continuous judgments of leakage faults can be achieved. It has the advantage of low false positives, and the valve leakage monitoring process is automatically carried out according to a specific frequency band through the alarm mechanism instead of manual work, which can be discovered and maintained in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings: Figure 1 The stop valve body of the present invention and two alarm mechanisms installed outside the stop valve body; Figure 2 It is the appearance diagram of the alarm mechanism of the present invention; Figure 3 It is a structural diagram of the detection base of the alarm mechanism of the present invention; Figure 4 A structural diagram of a detection module in the alarm mechanism of the present invention; Figure 5 A partial cutaway view of the detection base of the present invention; Figure 6 For the present invention Figure 5 Enlarged view of part A; Figure 7 For the present invention Figure 4 Side view of Figure 8For the present invention Figure 1 A front view of Fig. 9 For the present invention Figure 5 The disassembled diagram of the detection base and detection rod.

[0016] Description of reference numerals: 1. Stop valve; 2. Detection base; 21. Base plate; 211. Magnetic element; 212. Notch 1; 22. Extension plate; 221. Notch 2; 222. Limit rod; 3. Detection rod; 31. Push-pull rod; 311. Spring; 32. Adsorption block. DETAILED DESCRIPTION

[0017] The following will describe the implementation methods of the present application in detail with the help of accompanying drawings and examples, so that the implementation process of how the present application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0018] like Figure 1-6 As shown, it is the first embodiment of the present invention. To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a stop valve with automatic alarm function, comprising a stop valve 1 arranged in a valve well and an alarm mechanism respectively arranged at the edges of the flange interfaces at both ends of the stop valve 1, the alarm mechanism comprising two upper and lower butted detection bases 2, the upper and lower butted detection bases 2 are fixed by bolts, which is convenient for the installation, disassembly and movement of the installation position of the alarm mechanism, the connection surfaces of the upper and lower detection bases 2 are provided with an electrical connection interface, so that the upper and lower butted detection bases 2 are electrically connected, which is convenient for sharing power supply resources, the detection base 2 is composed of a substrate 21 and an extension plate 22 which are integrally fixedly connected and have interconnected internal cavities, the substrate 21 and the extension plate 22 are both annular structures and have the same inner diameter, the outer diameter of the substrate 21 is larger than the outer diameter of the extension plate 22 so that the two form an arc-shaped stepped structure, a plurality of notches 212 are equidistantly provided at the edge of the outer cylindrical surface of the substrate 21, a plurality of notches 221 are equidistantly provided at the edge of the outer cylindrical surface of the extension plate 22, the number of notches 221 and notch 212 is the same and the positions correspond to each other on the left and right; Furthermore, a detection module for leak detection is provided on the detection base 2, including a plurality of detection rods 3 arranged at the edge of the outer circumferential surface of the substrate 21, a microphone is arranged inside each detection rod 3, and a row of sound transmission holes close to the microphone head are provided on the outer surface of each detection rod 3, and the detection module mainly collects the sound emitted by the leak; Among them, Figure 4-7As shown, the number of the plurality of detection rods 3 and the notch 212 is the same and the positions correspond inside and outside. Each detection rod 3 is movably hinged with the base plate 21. When the detection rod 3 moves, one end thereof moves through the notch 212, and the other end of the detection rod 3 extends to the outside of the end face of the flange interface of the stop valve 1. The detection rod 3 is a plastic rod with a cylindrical structure. The plastic material has the characteristics of light weight, so that it has less resistance when it is moved by airflow or external force. Since the other end of the detection rod 3 spans the edge of the connection surface between the stop valve 1 and the pipeline, and the pole head of the microphone inside the detection rod 3 and the sound transmission hole of the detection rod 3 are close to the connection surface, when natural gas leaks from the connection surface, airflow is generated. Due to the different pressures inside and outside the pipeline, airflow sound is generated when natural gas leaks. The airflow sound forms a first noise. The airflow acts on the detection rod 3, causing a certain degree of vibration between the detection rod 3 and the stop valve 1 or the pipeline. The vibration forms a second noise. At the same time, the microphone located inside the detection rod 3 collects the first noise and the second noise emitted by the connection surface. The main function of the microphone is to amplify the collected sound.

[0019] In the second embodiment, a sound signal receiving module is also provided on the detection base 2, including a noise sensor and an acceleration sensor installed on the extension plate 22. The noise sensor is a CRY2110 noise sensor, which uses an RS-485 bus interface as a data communication port, and has the advantages of long communication distance, stable signal, and convenient multi-channel integration. After the first noise and the second noise collected are amplified by the internal microphone of the detection rod 3, the noise sensor receives the amplified sound more sensitively and accurately, and then triggers the alarm module to alarm, further improving the sensitivity of the alarm mechanism; Among them, the acceleration sensor is a piezoelectric acceleration sensor. The noise sensor and the acceleration sensor can be installed at any reasonable position on the extension plate 22, and the two are connected to the same controller. The piezoelectric acceleration sensor has the advantages of large range, small size and light weight. It is easy to install and saves installation space. When the detection rod 3 is impacted and vibrated by the airflow generated by the natural gas leakage, the acceleration sensor receives the vibration signal generated by the detection rod 3 and triggers the alarm module to alarm, thereby improving the accuracy of the leakage detection of the alarm mechanism.

[0020] Embodiment three, as Figure 3-9As shown, the interior of the detection base 2 is provided with a driving assembly for controlling the detection rod 3 to move, including a magnetic attraction member 211 installed on the cavity wall on one side of the base plate 21, and the base plate 21 and the extension plate 22 are provided with the same number of limit rods 222 as the detection rod 3 on the opposite surfaces of the cavity, and a push-pull rod 31 is movably hinged on the outer surface of the detection rod 3, and the other end of the push-pull rod 31 is movably connected to an adsorption block 32 slidably sleeved on the limit rod 222, and the adsorption block 32 slides and moves on the limit rod 222, and the displacement distance is less than the length of the limit rod 222 itself; The push-pull rod 31 is tilted and a spring 311 is fixedly connected to the top inclined surface thereof. The other end of the spring 311 is tilted upward and fixedly connected to the inner wall of the cavity of the substrate 21. The push-pull rod 31 and a part of the spring 311 are movable and penetrated in the second notch 221. When the detection rod 3 moves, the push-pull rod 31 and the spring 311 also move and penetrate in the second notch 221. Furthermore, a power module is also provided on the detection base 2, including a lithium battery pack electrically connected to the magnetic suction piece 211, the magnetic suction piece 211 is mainly an electromagnet, and the adsorption block 32 is an "L"-shaped iron block. In the initial state, the outer surface of the detection rod 3 is attached to the connection surface of the stop valve 1 and the pipeline. When the power module is turned on, the magnetic suction piece 211 is energized to generate magnetism and adsorb the adsorption block 32. The adsorption block 32 slides along the limit rod 222 until it is attached to the magnetic suction piece 211. During the movement of the adsorption block 32, the push-pull rod 31 is displaced, and then the detection rod 3 is moved with one end as the center. When the detection rod 3 moves to a certain arc, the spring 311 is in a stretched state, and the distance between the detection rod 3 and the connection surface is gradually increased. This process can move the microphone inside the detection rod 3 in multiple directions, which is helpful to accurately collect the sound generated by the leakage points at different positions. When the power module is powered off, the magnetic attraction part 211 loses its magnetism, and the detection rod 3 is restored to its original position by the elastic force of the spring 311. The power module is controlled by a timer to be cyclically turned on and off according to a specific frequency band, so that the detection rod 3 moves cyclically to form dynamic monitoring, which replaces manual detection with a high degree of automation. Furthermore, a communication module is also provided on the detection base 2, including a NB device electrically connected to the lithium battery pack. The noise sensor and the acceleration sensor are both communicatively connected to the NB device. The use of the NB communication device has the advantages of low power consumption and low cost. An alarm module is also provided on the detection base 2, including an alarm electrically connected to the communication module, so that the alarm signal is transmitted to the monitoring platform through the NB device.

[0021] When all the above embodiments are working, in the normal state, several detection rods 3 in the alarm mechanism span the edge of the connection surface between the stop valve 1 and the pipeline, and the pole head of the microphone inside the detection rod 3 and the sound transmission hole of the detection rod 3 are close to the periphery of the connection surface. The power module is controlled by a timer to cycle on and off according to a specific frequency band. When the power module is turned on, the magnetic suction piece 211 is energized to generate magnetism and adsorb the adsorption block 32. The adsorption block 32 slides along the limit rod 222 until it is attached to the magnetic suction piece 211. The adsorption block 32 moves During the process, the push-pull rod 31 is driven to move, and then the detection rod 3 is driven to move to a certain arc with one end as the center. At this time, the spring 311 is in a stretched state, and the distance between the detection rod 3 and the connection surface is gradually increased. This process can move the microphone inside the detection rod 3 in multiple directions, which is helpful to accurately collect the sound generated by the leakage points at different positions. When the power module is powered off, the magnetic attraction part 211 loses its magnetism, and the elastic force of the spring 311 restores the detection rod 3 to its original position, so that the detection rod 3 moves cyclically to form dynamic automatic monitoring; When natural gas leaks at the connection surface between the stop valve 1 and the pipeline, first, the connection surface will generate airflow sound, which forms the first noise. The leaked airflow acts on the detection rod 3, causing a certain degree of vibration between the detection rod 3 and the stop valve 1 or the pipeline, which forms the second noise. At the same time, the microphone located inside the detection rod 3 collects the first noise and the second noise emitted by the connection surface. The microphone amplifies the first noise and the second noise signals and receives them from the noise sensor. At the same time, the vibration signal generated by the detection rod 3 will be received by the acceleration sensor. Then the noise sensor and the acceleration sensor transmit the received signals to the alarm. The alarm transmits the alarm signal to the natural gas pipeline system monitoring platform through the NB device, which is convenient for timely detection and valve maintenance.

[0022] As is well known to those skilled in the art, the working principles and wiring methods of the existing instruments mentioned in this application, such as microphones, alarms, sensors, electromagnets and timers, are commonplace and are conventional means or common knowledge, and will not be elaborated here. Those skilled in the art may make appropriate and arbitrary selections according to their needs or convenience.

[0023] 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 stop valve with automatic alarm function, comprising a stop valve (1) arranged in a valve well and alarm mechanisms respectively arranged at the edges of flange interfaces at both ends of the stop valve (1), characterized in that: The alarm mechanism comprises two detection bases (2) butted against each other from top to bottom, the detection base (2) comprising a base plate (21) and an extension plate (22) which are integrally fixedly connected and have interconnected internal cavities; The detection base (2) is provided with a detection module for leak detection, comprising a plurality of detection rods (3) arranged at the edge of the outer circumferential surface of the base plate (21), each detection rod (3) being provided with a microphone inside, and each detection rod (3) having a row of sound transmission holes close to the microphone head on the outer surface; The detection base (2) is also provided with a sound signal receiving module, comprising a noise sensor and an acceleration sensor mounted on the extension plate (22); The detection base (2) is provided with a driving assembly for controlling the detection rod (3) to move, comprising a magnetic attraction member (211) mounted on a cavity wall on one side of the base plate (21); the base plate (21) and the extension plate (22) are provided with limit rods (222) on opposite surfaces of the cavity, the same number as the detection rod (3); a push-pull rod (31) is movably hinged on the outer surface of the detection rod (3); and the other end of the push-pull rod (31) is movably connected to an adsorption block (32) slidably sleeved on the limit rod (222).

2. A stop valve with automatic alarm function according to claim 1, characterized in that: The two upper and lower butted detection bases (2) are fixed by bolts, and the connection surfaces of the upper and lower detection bases (2) are provided with electrical connection interfaces, so that the upper and lower butted detection bases (2) are electrically connected.

3. The stop valve with automatic alarm function according to claim 1, characterized in that: The base plate (21) and the extension plate (22) are both annular structures and have the same inner diameter. The outer diameter of the base plate (21) is greater than the outer diameter of the extension plate (22) so that the two form an arc-shaped stepped structure. A plurality of notches (212) are equidistantly provided at the edge of the outer circular surface of the base plate (21).

4. A stop valve with automatic alarm function according to claim 3, characterized in that: The number of the plurality of detection rods (3) and the notch one (212) is the same and their positions correspond inside and outside. Each detection rod (3) is movably hinged to the base plate (21). One end of the detection rod (3) extends to the outside of the end surface of the flange interface of the stop valve (1). The detection rod (3) is a plastic rod with a cylindrical structure.

5. The stop valve with automatic alarm function according to claim 3 is characterized in that: A plurality of second notches (221) are equidistantly provided at the edge of the outer circumferential surface of the extension plate (22), and the number of the second notches (221) and the number of the first notches (212) are the same and their positions correspond to each other on the left and right.

6. A stop valve with automatic alarm function according to claim 5, characterized in that: The push-pull rod (31) is arranged obliquely and a spring (311) is fixedly connected to the top inclined surface thereof. The other end of the spring (311) is obliquely upward and fixedly connected to the inner wall of the cavity of the base plate (21). The push-pull rod (31) and a part of the spring (311) are movably inserted into the second notch (221).

7. The stop valve with automatic alarm function according to claim 1, characterized in that: The noise sensor is a CRY2110 noise sensor, which uses an RS-485 bus interface as a data communication port; The acceleration sensor is a piezoelectric acceleration sensor, and both the noise sensor and the acceleration sensor can be installed at any reasonable position on the extension plate (22), and the two are connected to the same controller.

8. The stop valve with automatic alarm function according to claim 1, characterized in that: The detection base (2) is also provided with a power module, comprising a lithium battery pack electrically connected to the magnetic attraction member (211); the magnetic attraction member (211) is mainly an electromagnet, and the adsorption block (32) is an "L"-shaped iron block.

9. A stop valve with automatic alarm function according to claim 8, characterized in that: The detection base (2) is also provided with a communication module, including a NB device electrically connected to the lithium battery pack, and the noise sensor and the acceleration sensor are both communicatively connected to the NB device.

10. A stop valve with automatic alarm function according to claim 9, characterized in that: The detection base (2) is also provided with an alarm module, comprising an alarm electrically connected to the communication module, so that the alarm signal is transmitted to the monitoring platform through the NB device.

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