Backflow early warning device of butterfly check valve

Abstract

The backflow early warning device of the butterfly check valve comprises the check valve and an early warning system arranged on the check valve, the check valve is provided with a valve port used for being communicated with two sections of pipelines, the inner wall of the valve port is provided with an annular water stop plate in the circumferential direction, and the annular water stop plate is connected with the butterfly check valve. A valve shaft and a butterfly valve clack with the valve shaft as the swing center are fixed to the valve port in the radial direction, a puller spring is arranged between the butterfly valve clack and the valve shaft, and the butterfly valve clack is attached to the annular water stop sheet in the preset fluid coming direction through the puller spring. The early warning system comprises an early warning monitoring unit and a sensor, and data collected by the sensor is analyzed in the early warning monitoring unit to judge whether a backflow phenomenon exists or not. According to the device provided by the utility model, the monitoring efficiency can be greatly improved, the safe and stable operation of the water supply system is ensured, the backflow pollution is avoided, and the effects of energy conservation, efficiency improvement and cost reduction are realized.

Description

Technical Field

[0001] This invention belongs to the field of backflow pollution monitoring technology for municipal water supply check valves, specifically relating to a backflow early warning device for a butterfly check valve. Background Technology

[0002] Urban water supply networks are an indispensable infrastructure of modern cities, often referred to as the city's "vascular system," and their health is crucial to the city's ecological civilization and sustainable development. Butterfly check valves, automatic valves that prevent backflow of fluid media, are widely used in urban water supply systems. Backflow contamination caused by their malfunction is one of the main causes of secondary water pollution in water supply networks. Check valves, operating in underground, enclosed, unstructured environments for extended periods, can experience problems such as valve disc jamming and sealing failure, leading to backflow and consequently causing fluid contamination, equipment damage, process interruptions, and energy waste. Currently, there is a lack of effective, low-cost, real-time early warning devices and monitoring methods for checking valve malfunctions and the presence of backflow contamination in water supply networks. Existing technologies primarily rely on passive monitoring of check valve malfunctions, depending mainly on regular manual inspections. This is inefficient, difficult to detect and report malfunctions in a timely manner, and results in significant time delays. It also fails to promptly stop backflow contamination and lacks proactive early warning and intelligent management mechanisms. Therefore, timely and accurate monitoring of the backflow contamination status of check valves is crucial for ensuring public health and safety.

[0003] Patent document CN1607348A discloses a device for frequently detecting water leaks using a simple apparatus, comprising two main parts: a water leak detection check valve that can detect the movement of a mover and transmit a detection signal of the valve body movement, wherein the mover moves in the same way as a valve body of a check valve connected to a water pipe and performing a switching function; and a signal processing device that analyzes the detection signal from the water leak detection check valve and activates a water leak alarm.

[0004] Patent document CN203019556U discloses a control, detection, and alarm device for a circulating water system of an internal mixer. It consists of an electromagnetic control valve mounted on a softened water pipe connected to the internal mixer's circulating loop system, and a temperature detection element and a digital electrical contact pressure gauge mounted in the internal mixer's circulating loop system. The upper and lower pressure limit switching signals of the digital electrical contact pressure gauge are connected to the input interface circuit of a PLC, and the output interface circuit of the PLC outputs corresponding open or close control signals to the electromagnetic control valve and the audible and visual alarm. Utility Model Content

[0005] The purpose of this invention is to provide a backflow early warning device for a butterfly check valve. This device can operate with extremely low power consumption for a long time without relying on external energy, and realize real-time sensing and monitoring of backflow in the check valve. It solves the problem of the lack of low-cost and efficient long-term real-time early warning devices and methods for backflow pollution in water supply networks, thereby greatly improving monitoring efficiency, ensuring the safe and stable operation of the water supply system, avoiding backflow pollution, and achieving the effects of energy saving, efficiency improvement and cost reduction.

[0006] To achieve the purpose of this utility model, the following technical solution is provided: a backflow warning device for a butterfly check valve, comprising a check valve and a warning system disposed on the check valve, wherein the check valve is provided with a valve port for connecting two sections of pipeline, an annular baffle is provided on the inner wall of the valve port along the circumferential direction, a valve shaft and a butterfly valve disc with the valve shaft as the swing center are fixed in the radial direction of the valve port, and a tensioning spring is provided between the butterfly valve disc and the valve shaft, wherein the tensioning spring causes the butterfly valve disc to face the direction of the preset fluid and fit against the annular baffle;

[0007] The early warning system includes an early warning monitoring unit and a sensor. The sensor is located at the contact point between the annular baffle and the butterfly valve disc. The early warning monitoring unit and the sensor are connected by a signal cable. The check valve has a through hole for the signal cable to pass through. The data collected by the sensor is analyzed in the early warning monitoring unit to determine whether there is a backflow phenomenon.

[0008] Based on the changing characteristics of the butterfly valve disc during operation, this utility model sets a sensor at the joint between the annular baffle plate and the butterfly valve disc to monitor whether there is backflow in the pipeline during daily operation.

[0009] Specifically, an annular sealing ring is provided between the annular water-blocking plate and the butterfly valve disc, thereby further improving the water tightness at the joint.

[0010] Specifically, the thickness of the annular sealing ring is 1-5mm.

[0011] Specifically, the sensors include inductive proximity sensors and thin-film stress sensors.

[0012] Specifically, the inductive proximity sensor is fixed to the annular water baffle plate by embedding. The annular fixing plate has a through threaded hole along a preset flow direction. The outer shell of the inductive proximity sensor has an external thread that engages with and locks the through threaded hole. The annular sealing ring is arranged between the inductive proximity sensor and the butterfly valve disc.

[0013] Specifically, the thin-film stress sensor is fixed to the annular sealing ring by embedding. The annular sealing ring has a mounting groove in the middle for arranging the thin-film stress sensor, and the surface of the thin-film stress sensor located at the groove opening is watertight. The maximum hydrostatic pressure resistance can reach 10MPa.

[0014] Specifically, the through-hole is provided with an internal thread, one end of the signal cable is connected to the sensor and the other end is provided with a watertight connector, and the watertight connector is threadedly connected and fixed to the through-hole.

[0015] Specifically, the warning system also includes a nylon housing for sealing protection and preventing signal interruption, with an IP68 protection rating.

[0016] Specifically, the early warning monitoring unit includes a microcontroller, a wireless communication module, a power supply, and a memory.

[0017] Specifically, the early warning monitoring unit also includes warning lights and a digital display interface.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] Based on the working principle of check valves, and in conjunction with an early warning system, they are integrated into the urban water supply network. This transforms the monitoring of valve failure and backflow status from intermittent passive inspection to real-time proactive sensing and early warning. It provides a practical and feasible technical approach for the accurate monitoring of backflow pollution from check valves in the water supply network, thereby significantly improving operation and maintenance efficiency and intelligent management level, and ensuring public health and safety.

[0020] The device integrates precise monitoring, self-contained power supply, long-cycle operation, and real-time sensing and warning. It has a compact structure, low cost, and can operate and monitor independently without relying on additional facilities. It has a fast response speed, high work efficiency, and can achieve all-weather real-time control of the check valve's working status. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the first type of backflow warning device provided in this embodiment;

[0022] Figure 2 This is a schematic diagram of the second type of backflow warning device provided in this embodiment;

[0023] Figure 3 The workflow of the early warning system provided in this embodiment;

[0024] In the diagram, 1. Digital display interface; 2. Valve shaft; 3. Early warning monitoring unit; 4. Valve body; 5. Butterfly valve disc; 6. Tightening spring; 7. Annular sealing ring; 8. Thin film stress sensor; 9. Signal cable; 10. Watertight connector; 11. Inductive proximity sensor; 12. Annular water baffle. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0026] This embodiment addresses the problems existing in the prior art by providing a backflow early warning device. It boasts advantages such as high-precision detection, self-contained operation, long-cycle low power consumption, sensory warning, convenient operation and maintenance, and remote control. Operating with extremely low power consumption for extended periods without relying on external energy sources, it achieves real-time sensing and monitoring of backflow in check valves. This solves the current problem of a lack of low-cost and efficient long-cycle real-time early warning devices and methods for backflow pollution in water supply networks, thereby significantly improving monitoring efficiency, ensuring the safe and stable operation of the water supply system, preventing backflow pollution, and achieving energy saving, efficiency improvement, and cost reduction.

[0027] Example 1: As Figure 1 As shown, this embodiment provides a backflow warning device for a butterfly check valve, including a check valve and a warning system installed on the check valve. The valve body 4 of the check valve is provided with a valve port for connecting two sections of pipeline. The inner wall of the valve port is provided with an annular baffle plate 12 along the circumference. The valve port is fixed with a valve shaft 2 and a butterfly valve disc 5 with the valve shaft 2 as the swing center. A tensioning spring 6 is provided between the butterfly valve disc 5 and the valve shaft 2. The tensioning spring 6 makes the butterfly valve disc 5 face the direction of the preset fluid flow and fit against the annular baffle plate 12.

[0028] The early warning system includes an early warning monitoring unit 3 and a thin-film stress sensor 8. The thin-film stress sensor 8 is located at the joint between the annular baffle plate 12 and the butterfly valve disc 5. The early warning monitoring unit 3 and the thin-film stress sensor 8 are connected by a signal cable 9. The valve body 4 is provided with a through hole for the signal cable 9 to pass through. The data collected by the thin-film stress sensor 8 is analyzed in the early warning monitoring unit 3 to determine whether there is a backflow phenomenon.

[0029] More specifically, the check valve consists of a valve body 4, a valve disc 5, a valve shaft 2, and a clamping spring 6. An annular sealing ring 7 is provided on the valve body 4, located between the valve body 4 and the butterfly valve disc 5. A through-hole is provided radially on the valve body 4 to facilitate the interconnection of communication cables. The contact sensing unit is entirely located radially inside the valve body 4 and consists of a thin-film stress sensor 8 and a signal cable 9. The thin-film stress sensor 8 is mounted on the annular sealing ring 7 of the valve body 4 using instant adhesive, and the membrane surface is watertight. Its maximum hydrostatic pressure resistance is up to 10 MPa. When the butterfly valve disc 5 is fully closed, the thin-film stress sensor 8 is in close contact with the butterfly valve disc 5. The opening and closing state of the butterfly valve disc 5 can be effectively monitored by the magnitude of the contact force. The sensor's monitoring range is 0-20 N, and its accuracy is 0.01. The early warning monitoring unit 3 is entirely located radially outside the valve body 4 and features self-capacitance, long-cycle low power consumption, and sensing and warning capabilities. The external casing is made of nylon, providing waterproof and unblocked signal transmission with an IP68 protection rating. The bottom of the casing has a curved structure that fits tightly against the outer arc of the valve body 4 and is fixed with bolts, thus integrating the early warning monitoring unit 3 and the check valve. The early warning monitoring unit 3 is equipped with a microcontroller, wireless communication module, power supply, memory, warning light, and digital display interface 1, which facilitates backflow monitoring control, signal transmission, power supply, alarm, and other functions. The digital display interface 1 uses an LED display screen and communicates with the microcontroller in the early warning monitoring unit 3 through a parallel interface, displaying the real-time data and working status of the early warning monitoring unit 3. The early warning monitoring unit 3 is connected to the thin-film stress sensor 8 through a signal cable 9, which passes through the radial through-hole of the valve body 4 and has a watertight connector 10 on the outside of the valve body 4. The watertight connector 10 is connected to the through-hole of the valve body 4 through threads and is sealed with an axial O-ring. In summary, the backflow warning device for the butterfly check valve can be integrated with the butterfly check valve and installed in an underground enclosed space. It can achieve long-term real-time monitoring of backflow pollution of the check valve and actively provide early warning through its own self-contained and autonomous system, and realize remote data transmission and start / stop control through wireless communication.

[0030] The backflow phenomenon is determined by real-time acquisition of contact stress data between the butterfly valve disc 5 and the annular baffle plate 12 of the valve body 4 by the thin-film sensor 8. This data is used to determine the opening and closing state of the valve disc 5, and is compared with a set contact force threshold to analyze whether backflow exists. The results are then transmitted back to the backend management system. Additionally, when a backflow signal is detected, the early warning monitoring unit 3 triggers an early warning mechanism, providing audible and visual alarms to the backend management system and alerting staff to promptly investigate the risk. The backflow early warning device is reset after the risk is addressed.

[0031] Example 2: Figure 2The diagram shows a backflow warning device for a butterfly check valve according to another embodiment. It includes a check valve, an inductive proximity sensor 11, a watertight connector 10, a warning monitoring unit 3, and a digital display interface 1. The check valve consists of a valve body 4, a butterfly valve disc 5, a valve shaft 2, and a tensioning spring 6. The valve body 4 has an M6 through-thread perpendicular to the butterfly valve disc 5 on its radially inner side. A 3mm thick annular sealing ring 7 is provided on the annular baffle plate 12 of the valve body 4, located between the annular baffle plate 12 and the butterfly valve disc 5. A 90° vertical through-hole is provided at the upper radial end of the valve body 4 to facilitate the interconnection of the signal cable 9. The inductive proximity sensor 11 is a miniature cylindrical shape with an M6 stainless steel external thread, and the sensing unit is embedded in the stainless steel threaded hole. The internal components are sealed with potting compound, achieving an IP68 protection rating. The inductive proximity sensor 11 is locked and fixed in place by a through-hole sealing thread at the upper end of the valve body 4. The sensing plane of the inductive proximity sensor 11 is parallel to the inner plane of the butterfly valve disc 5. When the butterfly valve disc 5 is fully closed, the annular sealing ring 7 is parallel to and overlaps with the butterfly valve disc 5. At this time, the distance between the sensing plane of the inductive proximity sensor 11 and the plane of the butterfly valve disc 5 is 3mm. By collecting the voltage signal between the inductive proximity sensor 11 and the butterfly valve disc 5, the distance change between the butterfly valve disc 5 and the annular baffle plate 12 is sensed, thereby effectively detecting the opening and closing state of the butterfly valve disc 5 and determining whether backflow exists. The maximum response frequency is 2000Hz, and the response time is less than 0.5ms.

[0032] Regarding the watertight connector 10, one end is connected to the inductive proximity sensor 11, and the other end is led out through the passage hole above the check valve to connect to the external early warning monitoring unit 3. Its cable connector and connection are sealed with glue, and the protection level is IP68 to ensure normal use in the underwater environment.

[0033] The early warning monitoring unit 3 features self-capacitance, long-cycle low power consumption, and sensing and warning capabilities. Internally, it is equipped with a microcontroller, wireless communication module, power supply, memory, and warning lights to perform control, transmission, power supply, and alarm functions. Externally, the early warning monitoring unit 3 has a nylon watertight insulating shell with an IP68 protection rating. The bottom surface of the shell is curved, tightly fitting against the outer arc surface of the check valve body 4 and secured with bolts, thus integrating the early warning monitoring unit 3 and the check valve. Simultaneously, the early warning monitoring unit 3 connects to an inductive proximity sensor 11 via a watertight connector 10. Based on the sensor's input data, it compares it in real-time with a set threshold and outputs a feedback signal, achieving precise control of the check valve's real-time backflow signal detection. This meets the requirements for rapid response and completes tasks such as sensor data acquisition, data processing, real-time early warning, and online communication.

[0034] The early warning system uses an inductive proximity sensor 11 to collect real-time data on the positional changes between the butterfly valve disc 5 and the annular baffle plate 12. It determines the opening and closing position of the butterfly valve disc 5, compares the collected data with preset normal thresholds to determine if backflow is present, and wirelessly transmits this data to the backend management system. Furthermore, when a backflow signal is detected, the early warning system triggers an alarm mechanism, sending an audible and visual alarm to the backend management system and alerting staff to promptly investigate the risk. The system is reset after the risk has been addressed.

[0035] like Figure 3 The following is a detailed monitoring process of the backflow early warning device provided in this embodiment:

[0036] The first step is to activate the early warning system;

[0037] The second step is for the early warning system to collect real-time operating status data of the butterfly check valve;

[0038] The third step is to compare and analyze the collected data with the predetermined threshold and then feed the data back to the early warning control system.

[0039] The fourth step is to determine if there is a backflow phenomenon. If so, proceed to the next step; otherwise, return to the second step.

[0040] Fifth, the system triggers the early warning mechanism, issuing audible and visual warnings and providing feedback to the backend management system to assist staff in making quick decisions;

[0041] Step 6: After the emergency response, the backflow warning system is reset, and the system continues to perform testing.

[0042] Furthermore, the terms "upper," "lower," "inner," "outer," "front," and "rear" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Unless otherwise specifically stated, the relative steps, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of this invention.

[0043] Of course, the above description is only a specific embodiment of the present utility model and is not intended to limit the scope of the present utility model. All equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model should be included in the scope of the claims of the present utility model.

[0044] Finally, it should be noted that the above-described embodiments are merely specific implementations of this utility model, used to illustrate the technical solution of this utility model, and not to limit it. The protection scope of this utility model is not limited thereto. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this utility model. These modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A backflow warning device for a butterfly check valve, comprising: The invention relates to a check valve and a pre-warning system arranged on the check valve, the check valve is provided with a valve port for connecting two pipes, an annular water baffle is arranged on the inner wall of the valve port in a circumferential direction, a valve shaft and a butterfly valve disc with the valve shaft as a swing center are fixed on the valve port in a radial direction, a jacking spring is arranged between the butterfly valve disc and the valve shaft, the butterfly valve disc is made to adhere to the annular water baffle by the jacking spring and faces the direction of the preset fluid. The pre-warning system comprises a pre-warning monitoring unit and a sensor, the sensor is arranged at the adhering position of the annular water baffle and the butterfly valve disc, the pre-warning monitoring unit and the sensor are communicated through a signal cable, the check valve is provided with a cabin hole for the signal cable to pass through, the data collected by the sensor is analyzed in the pre-warning monitoring unit to determine whether there is a backflow phenomenon.

2. The backflow warning device of the butterfly check valve according to claim 1, wherein An annular sealing ring is arranged between the annular water baffle and the butterfly valve disc.

3. The backflow warning device of the butterfly check valve according to claim 2, wherein The thickness of the annular sealing ring is 1-5mm.

4. The backflow warning device of the butterfly check valve according to claim 1, wherein The sensor comprises an inductance proximity sensor and a thin film stress sensor.

5. The backflow warning device of the butterfly check valve according to claim 1, wherein An internal thread is arranged in the cabin hole, one end of the signal cable is connected with the sensor and the other end is provided with a water-tight joint, the water-tight joint is fixedly connected with the cabin hole through screw threads.

6. The backflow warning device of the butterfly check valve according to claim 1, wherein The pre-warning system further comprises a nylon material shell for sealing protection and preventing signal interruption.

7. The backflow warning device of the butterfly check valve according to claim 1, wherein The pre-warning monitoring unit comprises a microcontroller, a wireless communication module, a power supply and a memory.

8. The backflow warning device of the butterfly check valve according to claim 7, wherein The pre-warning monitoring unit further comprises a warning light and a digital display interface.

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