Intelligent executing mechanism of fuel gas segmented valve

Abstract

The utility model provides an intelligent executing mechanism of a fuel gas segmented valve. The intelligent executing mechanism of the fuel gas segmented valve comprises a bottom shell, a connecting flange is arranged at the bottom of the bottom shell, a two-position three-way electromagnetic valve set is fixedly installed in the bottom shell and connected with a pneumatic motor, an output shaft of the pneumatic motor is connected with a speed reducer, the speed reducer is installed in the bottom shell, and the speed reducer is connected with a motor. The speed reducer is provided with a driving shaft, the pneumatic motor is connected with the driving shaft through the speed reducer, the driving shaft is used for being connected with a valve, the bottom end of the driving shaft extends out of the connecting flange, the speed reducer is provided with a limiting stopper, and one side of the limiting stopper is provided with a valve position sensor connected with the speed reducer. The intelligent executing mechanism for the fuel gas segmented valve has the advantages of being convenient to use, capable of remotely monitoring and controlling the valve, and capable of effectively preventing and reducing various safety accidents caused by natural gas leakage, fire catching and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of intelligent valves, in particular to an intelligent actuator for a gas sectional valve. Background Art

[0002] Due to energy supply and cost constraints, the city gas pipeline segment valves, branch valves, and cut-off valves of pressure regulating boxes (cabinets) distributed in many places in the city are almost all manual valves. When a gas leak occurs, the relevant valves must be closed on site by assigned personnel. Facts have proved that the general response time is at least more than 15 minutes, and some even take longer. With the advancement of pipeline construction, some leaking points may need to close 4-5 or even more valves at the same time, which greatly delays the time for accident rescue and is very unfavorable for accident control.

[0003] Conventional valve actuators have always been electric, pneumatic, hydraulic, etc., and are mainly used in factories, stations and other places that can provide sufficient power, gas and other energy sources. These actuators are diverse in variety and mature in technology, and have been used in various industries (especially petrochemical, power and other industries) for many years. However, traditional actuators used in urban gas pipelines have disadvantages such as large size, high energy supply cost, and high signal transmission cost, and cannot be widely used in urban gas pipelines.

[0004] Some people have also done research on the actuators of gas pipeline valves, and have proposed using the gas pressure itself as a driving force. However, this solution has a fatal flaw, namely the problem of gas emission. Due to the flammable and explosive nature of gas, if it is discharged into the air, especially in a limited space such as a valve well, it is very easy to cause fire and explosion accidents. At the same time, it cannot be re-injected into the pipeline due to the pressure difference. Therefore, this plan was eventually rejected.

[0005] Some people have tried to use batteries as energy sources for electric actuators. Theoretically, this solution is feasible, but because batteries have self-consumption defects and generally take a long time to charge, the maintenance cost is high. In addition, lead-acid batteries have low energy density and large volume, while lithium-ion batteries have high energy density and small volume, but low safety performance (they have great energy when burning and exploding under oxygen-free conditions). In the end, the rechargeable battery solution was cancelled and disposable lithium batteries that are easy to replace were used.

[0006] Cylinder actuators are widely used in the petrochemical and electric power industries. They use compressed air as power, are safe, environmentally friendly, risk-free, and have large torque. However, due to their large size and high gas consumption, they cannot adapt to the narrow valve well space.

[0007] Therefore, it is necessary to provide a new intelligent actuator for gas segmented valve to solve the above technical problems. Utility Model Content

[0008] The technical problem solved by the utility model is to provide a gas sectional valve intelligent actuator which is easy to use, can remotely monitor and control valves, and can effectively prevent and reduce various safety accidents caused by natural gas leakage, fire, etc.

[0009] In order to solve the above technical problems, the utility model provides a gas section valve intelligent actuator, including: a bottom shell, a connecting flange is provided at the bottom of the bottom shell, a two-position three-way solenoid valve group is fixedly installed in the bottom shell, the two-position three-way solenoid valve group is connected to a pneumatic motor, a reducer is connected to the output shaft of the pneumatic motor, the reducer is installed in the bottom shell, a drive shaft is provided on the reducer, the pneumatic motor is connected to the drive shaft through the reducer, the drive shaft is used to connect the valve, the bottom end of the drive shaft extends to the outside of the connecting flange, a limiter is provided on the reducer, and a valve position sensor connected to the reducer is provided on one side of the limiter.

[0010] Preferably, a manual shaft is connected to the reducer, and the manual shaft is used to manually rotate the drive shaft through the reducer.

[0011] Preferably, a first upper cover and a second upper cover are fixedly installed on the top of the bottom shell by bolts, the manual shaft, the pneumatic motor, and the two-position three-way solenoid valve group are all located in the second upper cover, the limiter and the valve position sensor are both located in the first upper cover, and the first upper cover is provided with a valve opening and closing window, and the valve opening and closing window is located directly above the limiter.

[0012] Preferably, a control circuit board fixedly mounted on the top of the bottom shell is disposed in the first upper cover, a liquid crystal display screen is fixedly mounted on the top of the control circuit board, and a liquid crystal display window is disposed on the first upper cover, and the liquid crystal display window faces the liquid crystal display screen.

[0013] Preferably, a disposable lithium battery is arranged in the second upper cover, and a battery cover is threadedly mounted on the second upper cover, and the battery cover faces the disposable lithium battery.

[0014] Preferably, an air intake pipe joint and an exhaust valve are fixedly mounted on the bottom shell, and both the air intake pipe joint and the exhaust valve are connected to the two-position three-way solenoid valve group.

[0015] Compared with the related art, the intelligent actuator for gas sectional valve provided by the utility model has the following beneficial effects:

[0016] The utility model provides an intelligent actuator for a gas sectional valve, which drives the valve to open or close by converting gas energy (compressed air / nitrogen) into mechanical energy, thereby controlling the fluid flow and pressure, and solving the problem of remote monitoring and execution of the valve through a pipeline remote actuator, effectively preventing and reducing various safety accidents caused by natural gas leakage, fire, etc., which is of great significance to protecting public safety and the lives and property of the people. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A structural schematic diagram of a preferred embodiment of the intelligent actuator for a gas sectional valve provided by the utility model;

[0018] Figure 2 for Figure 1 A schematic diagram of the structure from another perspective is shown;

[0019] Figure 3 for Figure 1 The schematic diagram of the structure after the first upper cover and the second upper cover are removed is shown;

[0020] Figure 4 for Figure 3 A schematic diagram of the structure from another perspective is shown;

[0021] Figure 5 for Figure 3 A schematic diagram of the structure from a first viewing angle after the bottom shell is removed is shown;

[0022] Figure 6 for Figure 3 A schematic diagram of the structure from a second viewing angle after the bottom shell is removed;

[0023] Figure 7 for Figure 3 A schematic diagram of the structure from a third viewing angle after the bottom shell is removed;

[0024] Figure 8 This is a control principle diagram of the intelligent actuator of the gas sectional valve provided by the utility model.

[0025] Numbers in the figure: 1. bottom shell, 2. connecting flange, 3. pneumatic motor, 4. two-position three-way solenoid valve group, 5. reducer, 6. drive shaft, 7. limiter, 8. valve position sensor, 9. control circuit board, 10. liquid crystal display, 11. liquid crystal display window, 12. first upper cover, 13. valve opening and closing window, 14. second upper cover, 15. manual shaft, 16. battery cover, 17. intake pipe joint, 18. exhaust valve, 19. circuit wake-up area. DETAILED DESCRIPTION

[0026] The utility model is further described below in conjunction with the accompanying drawings and implementation modes.

[0027] See also Figure 1-Figure 8 ,in, Figure 1 A structural schematic diagram of a preferred embodiment of the intelligent actuator for a gas sectional valve provided by the utility model; Figure 2 for Figure 1 A schematic diagram of the structure from another perspective is shown; Figure 3 for Figure 1 The schematic diagram of the structure after the first upper cover and the second upper cover are removed is shown; Figure 4 for Figure 3 A schematic diagram of the structure from another perspective is shown; Figure 5 for Figure 3 A schematic diagram of the structure from a first viewing angle after the bottom shell is removed is shown; Figure 6 for Figure 3 A schematic diagram of the structure from a second viewing angle after the bottom shell is removed; Figure 7 for Figure 3 A schematic diagram of the structure from a third viewing angle after the bottom shell is removed; Figure 8 The control principle diagram of the intelligent actuator of the gas sectional valve provided by the utility model. The intelligent actuator of the gas sectional valve comprises: a bottom shell 1, a connecting flange 2 is provided at the bottom of the bottom shell 1, a two-position three-way solenoid valve group 4 is fixedly installed in the bottom shell 1, the two-position three-way solenoid valve group 4 is connected to an air motor 3, a reducer 5 is connected to the output shaft of the air motor 3, the reducer 5 is installed in the bottom shell 1, a drive shaft 6 is provided on the reducer 5, the air motor 3 is connected to the drive shaft 6 through the reducer 5, the drive shaft 6 is used to connect the valve, the bottom end of the drive shaft 6 extends to the outside of the connecting flange 2, a limiter 7 is provided on the reducer 5, and a valve position sensor 8 connected to the reducer 5 is provided on one side of the limiter 7.

[0028] The reducer 5 is connected to a manual shaft 15 , and the manual shaft 15 is used to manually rotate the drive shaft 6 through the reducer 5 .

[0029] The top of the bottom shell 1 is fixed with a first upper cover 12 and a second upper cover 14 by bolts. The manual shaft 15, the pneumatic motor 3, and the two-position three-way solenoid valve group 4 are all located in the second upper cover 14. The limiter 7 and the valve position sensor 8 are both located in the first upper cover 12. The first upper cover 12 is provided with a valve opening and closing window 13, and the valve opening and closing window 13 is located directly above the limiter 7.

[0030] A control circuit board 9 fixedly mounted on the top of the bottom shell 1 is disposed in the first upper cover 12 , a liquid crystal display screen 10 is fixedly mounted on the top of the control circuit board 9 , and a liquid crystal display window 11 is disposed on the first upper cover 12 , and the liquid crystal display window 11 faces the liquid crystal display screen 10 .

[0031] A disposable lithium battery is disposed in the second upper cover 14 , and a battery cover 16 is threadedly mounted on the second upper cover 14 . The battery cover 16 faces the disposable lithium battery. In this embodiment, the disposable lithium battery is not shown in the figure.

[0032] An air intake pipe joint and an exhaust valve are fixedly mounted on the bottom shell 1 , and both the air intake pipe joint and the exhaust valve are connected to the two-position three-way solenoid valve group 4 .

[0033] A safety valve is provided at the bottom of the housing 1, and the safety air pressure of the safety valve is ≤0.05MPa.

[0034] The control circuit board 9 is provided with a GPS module, a Bluetooth module, a NB-IOT module and a temperature and humidity sensor, and the control circuit board 9 is connected to the liquid crystal display 10, the two-position three-way solenoid valve 4, the limiter 7 and the valve position sensor 8.

[0035] The GPS module, the Bluetooth module and the NB-IOT module are all equipped with external antennas. The NB-IOT module is used to communicate the relevant data of the valve actuator and the duty room; the Bluetooth module is used to communicate with the mobile phone terminal of the patrol personnel to monitor various states of the valve and operate the valve; the GPS module is used to locate the valve and the actuator.

[0036] The disposable lithium battery is connected to the control circuit board 9, and the disposable lithium battery is used to power the GPS module, the Bluetooth module, the NB-IOT module, the temperature and humidity sensor, the limiter 7, the valve position sensor 8, the two-position three-way solenoid valve 4, and the liquid crystal display 10.

[0037] In this embodiment, pneumatic motor 3: converts gas energy (compressed air) into mechanical energy to drive the valve to open or close. According to the maximum operating torque of the PE110 valve of 70N.m (according to a safety factor of 1.5 to 2 times), it should be 140N.m. Select a planetary reducer that meets the rated torque of 140N.m. Select the smallest reduction ratio of 30:1 for the same size. The pneumatic motor torque is 4.66Nm. According to the formula: power = torque × speed ÷ 9550 (kilowatts), the pneumatic motor power is: 4.66*259 / 9550=0.12kw. Select a pneumatic motor with a rated torque greater than 4.66Nm, model QPG42-27, rated speed 259rpm, idling 518rpm, rated torque 9.45Nm, starting torque 15N.m, stop torque 19N.m, the stop torque of the motor after calibration through the reducer is 304N.m, which is greater than the maximum operation of 140N.m, meeting the self-locking performance, the minimum starting torque of the planetary reducer is 120.4Nm, which is less than the minimum starting torque of the pneumatic motor 206.4Nm, and the execution process will not get stuck. The gas consumption of this product parameter is 7.916L / s. According to the pneumatic motor selection parameters, the initial speed is 259r / min (4.31r / s); according to the valve design opening time of 2s (valve speed is 0.125r / s), under the condition of constant transmission power, the corresponding planetary reducer reduction ratio is 4.31 / 0.125=34.48. Considering mechanical friction, transmission efficiency and design margin, the rated input air pressure is 0.6~0.7MPa.

[0038] In this embodiment, the air inlet joint pipe is connected to a gas cylinder, and the power selection (gas cylinder): considering that the valve conveys natural gas, which is a flammable and explosive gas. The interior of the valve well is a limited space. In this embodiment, the power source uses a nitrogen gas source as the power of the valve actuator. Nitrogen is stored in the valve well in the form of a high-pressure gas cylinder. According to the design: the time for the valve intelligent actuator to open and close the valve once is 4 seconds, and the gas consumption is about 32L. The nitrogen cylinder uses a cylinder volume of 4L and a working pressure of 1.2MPa. The dimensions are: 505mm high, 140mm outer diameter, and the cylinder capacity at 1.2MPa is 48L, which meets the valve switching requirement once. The vehicle-mounted nitrogen cylinder for filling each nitrogen cylinder in the valve well with nitrogen uses a cylinder volume of 40L and a working pressure of 12MPa. The gas cylinder can be filled about 250 times at one time. The nitrogen cylinder is equipped with a pressure reducing valve. The selection of the pressure reducing valve: Considering the working pressure of the nitrogen cylinder is 1.2MPa and the working pressure of the pneumatic motor is 0.6-0.7MPa, the gas cylinder pressure reducing valve needs to reduce the nitrogen pressure of 1.2MPa to 0.6MPa during design.

[0039] Travel switch: used to detect the opening and position of the valve and transmit the signal to the control system.

[0040] Valve position sensor 8: detects the degree of valve opening (usually displays the opening angle) and transmits the signal to the control circuit board 9 and the remote control module.

[0041] Limiter 7: used to limit the valve position beyond the normal open or closed position when the valve is fully opened or fully closed.

[0042] Torque sensor: detects the torque value of the valve stem and the maximum torque state, and alarms when the set value is reached. The data is transmitted to the duty room to realize remote monitoring of torque.

[0043] Two-position three-way solenoid valve 4: used to change the direction of the air inlet of the pneumatic motor, so that the pneumatic motor 3 can rotate in the forward and reverse directions, thereby realizing the opening and closing of the valve.

[0044] Manual and automatic device (manual axis 15): In case of insufficient gas supply or other emergency situations, on-site inspection personnel use the ball valve key to control the manual and automatic switching device button of the valve intelligent actuator, so that the valve intelligent actuator can separate and close the PE ball valve body, thereby controlling the opening and closing of the PE valve.

[0045] Equipment housing: used to place the entire valve actuator in an equipment housing, which has an explosion-proof rating of ExdⅡBT4 Gb or above, and a waterproof and dustproof rating of IP67 or above.

[0046] In addition, pneumatic valve actuators may also contain other components such as seals and bearings. These components work together to enable pneumatic valve actuators to accurately control the opening and closing of valves and achieve regulation of fluid flow and pressure.

[0047] Main components of electronic controller and remote control module:

[0048] GPS module: locates the valve well position;

[0049] Bluetooth module: Through Bluetooth, it can communicate with the mobile terminal of the inspection personnel to monitor the various states of the valve nearby and operate the valve nearby;

[0050] NB-IOT module: It can communicate the valve actuator related data with the duty room;

[0051] Switch button: Mainly used for on-site inspection personnel to control the opening and closing of the valve intelligent actuator with the ball valve key.

[0052] Disposable lithium battery: mainly provides power for the electronic controller of the valve actuator;

[0053] Control circuit board 9: used to receive various sensor signals, pressure, and temperature of the valve; control the opening and closing of the valve through calculation, and protect the key components of the valve and its actuator; receive and send remote commands through NB-IOT, 4G, and 5G signals.

[0054] When the valve needs to be switched, the control circuit board 9 or the remote controller opens the valve of the nitrogen bottle, and the nitrogen enters the two-position three-way solenoid valve 4, and enters the two-position three-way valve 4 to start the pneumatic motor 3 and open the valve; when the valve needs to be closed, the control circuit board 9 or the remote controller energizes the two-position three-way solenoid valve 4, and the two-position three-way solenoid valve 4 reversely supplies air to the pneumatic motor 3 to close the valve. The pressure reducing valve mainly reduces the nitrogen pressure in the nitrogen bottle to the working pressure required by the pneumatic motor. The emergency shut-off valve is to urgently cut off the nitrogen gas source after the valve position sensor or torque sensor issues an alarm. Ensure that the valve and the actuator are not damaged. At the same time, the control circuit board 9 and the remote control module monitor the air pressure of the nitrogen bottle in real time, and alarm when the pressure is insufficient. The staff conducts on-site inspections. When it is confirmed that the nitrogen amount is insufficient, the nitrogen bottle is filled on the spot using a nitrogen bottle truck.

[0055] In this embodiment, a pressure sensor is provided on the nitrogen cylinder, and the pressure of the nitrogen cylinder is collected through the pressure sensor. The time and longitude and latitude are collected through the GPS module. The Bluetooth module can be connected to the mobile phone of the patrol personnel to monitor various states of the valve nearby, and the NB-IOT module is used to transmit the information to the duty room to realize remote monitoring of the valve. The control circuit board 9 reserves interfaces for combustible gas detection, pipeline pressure detection, ambient temperature, and humidity detection. At the same time, the electronic controller housing is provided with a circuit wake-up area 19. The LCD in the standby state is not displayed, and the patrol personnel stand at the valve well mouth and use the special tool for the valve well key to control the electronic controller.

[0056] The harsh environment of the gas valve well is mainly reflected in the following aspects:

[0057] Closed and humid: Gas valve wells are usually closed to keep the internal equipment stable and safe. However, this closed environment also leads to poor internal air circulation, and the possible presence of water vapor and groundwater infiltration keeps the inside of the valve well in a constant humid state, especially in the rainy season in summer when the equipment in the valve well is flooded.

[0058] Backlit and dark: Since valve wells are usually designed underground, they often lack natural light and the internal environment is dark. This not only makes it difficult for maintenance personnel to see the internal situation, increases the difficulty of operation, but also promotes the growth of microorganisms.

[0059] Easy for microorganisms to breed: In a closed, humid, and dark environment, various microorganisms such as bacteria and molds are easy to breed inside the gas valve well. These microorganisms will not only cause corrosion and damage to the equipment, but may also pose a threat to the health of maintenance personnel.

[0060] High gas concentration: The gas valve well is filled with fuel gas and other flammable gases. In the event of a slight leak in the valve, these gases will accumulate inside the valve well, forming a high gas concentration. This not only increases the risk of fire and explosion, but also makes the environment inside the valve well more dangerous.

[0061] Poor communication and power supply: Since valve wells are usually located underground, their communication and power supply conditions are often limited. This may lead to the failure of remote monitoring and control systems, making the management and maintenance of valve wells more difficult.

[0062] Wells are scattered and the environment is complex: Gas valve wells are usually scattered in various corners of the city, and the surrounding environment is complex and diverse. This makes it more difficult to monitor and manage them uniformly, and also increases the difficulty of maintenance and emergency treatment.

[0063] There is a large temperature difference between morning and evening (day and night) outdoors. The temperature is high during the day, and the pressure inside the shell will gradually increase as the temperature rises. Once the temperature outside the shell is too low at night, a pressure difference will be generated inside and outside the shell, causing water vapor outside the shell to be sucked back into the shell. As time goes by, more and more water vapor will accumulate inside the shell. The water vapor inside the shell will affect the normal operation of the circuit board. Severe water accumulation will cause short circuits in circuit board components and burn out the circuit board.

[0064] In summary, the harsh environment of the gas valve well is mainly manifested in its closed, humid, dark, easy microbial reproduction, high gas concentration, poor communication and power supply. These characteristics make the management and maintenance of the gas valve well face many challenges, and corresponding measures need to be taken to ensure its safe and reliable operation. In particular, the sealing of the shell is of utmost importance. General sealing cannot solve the problem of water vapor backflow inside the shell caused by the temperature difference between day and night. Not only must the shell structure have basic sealing gaskets, but it must also prevent the problem of water vapor backflow into the shell caused by the pressure difference caused by the temperature difference.

[0065] After on-site feedback and testing, in this embodiment, filling the shell with a certain pressure can solve the problem of water vapor backflow. Since the valve well is used in flammable and explosive natural gas, in order to better improve safety, the compressed air is replaced with safer nitrogen.

[0066] Compared with the related art, the intelligent actuator for gas sectional valve provided by the utility model has the following beneficial effects:

[0067] The utility model provides an intelligent actuator for a gas sectional valve, which drives the valve to open or close by converting gas energy (compressed air / nitrogen) into mechanical energy, thereby controlling the fluid flow and pressure, and solving the problem of remote monitoring and execution of the valve through a pipeline remote actuator, effectively preventing and reducing various safety accidents caused by natural gas leakage, fire, etc., which is of great significance to protecting public safety and the lives and property of the people.

[0068] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A gas sectional valve intelligent actuator, characterized in that: include: A bottom shell, wherein a connecting flange is provided at the bottom of the bottom shell, a two-position three-way solenoid valve group is fixedly installed in the bottom shell, the two-position three-way solenoid valve group is connected to an air motor, a reducer is connected to the output shaft of the air motor, the reducer is installed in the bottom shell, a drive shaft is provided on the reducer, the air motor is connected to the drive shaft through the reducer, the drive shaft is used to connect a valve, the bottom end of the drive shaft extends to the outside of the connecting flange, a limiter is provided on the reducer, and a valve position sensor connected to the reducer is provided on one side of the limiter.

2. The intelligent actuator for gas sectional valve according to claim 1 is characterized in that: The reducer is connected with a manual shaft, and the manual shaft is used to rotate the drive shaft manually through the reducer.

3. The intelligent actuator for gas sectional valve according to claim 2 is characterized in that: The top of the bottom shell is fixed with a first upper cover and a second upper cover by bolts, the manual shaft, the pneumatic motor, and the two-position three-way solenoid valve group are all located in the second upper cover, the limiter and the valve position sensor are both located in the first upper cover, and the first upper cover is provided with a valve opening and closing window, and the valve opening and closing window is located directly above the limiter.

4. The intelligent actuator for gas sectional valve according to claim 3 is characterized in that: A control circuit board fixedly mounted on the top of the bottom shell is disposed in the first upper cover, a liquid crystal display screen is fixedly mounted on the top of the control circuit board, and a liquid crystal display window is disposed on the first upper cover, and the liquid crystal display window faces the liquid crystal display screen.

5. The intelligent actuator for gas sectional valve according to claim 4 is characterized in that: A disposable lithium battery is arranged in the second upper cover, and a battery cover is threadedly mounted on the second upper cover, and the battery cover faces the disposable lithium battery.

6. The intelligent actuator for gas sectional valve according to claim 1, characterized in that: An air intake pipe joint and an exhaust valve are fixedly mounted on the bottom shell, and both the air intake pipe joint and the exhaust valve are connected to the two-position three-way solenoid valve group.

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