Inflation system, transfer device and method for sulfur hexafluoride gas cylinder

Abstract

The invention discloses a sulfur hexafluoride gas cylinder inflation system, a sulfur hexafluoride gas cylinder transfer device and a sulfur hexafluoride gas cylinder transfer method.The sulfur hexafluoride gas cylinder inflation system comprises an inflation starting detection assembly, and the inflation starting detection assembly comprises an environment oxygen concentration detection part, an environment sulfur hexafluoride gas concentration detection part, an environment humidity detection part and an environment temperature detection part which are arranged on one side of a gas cylinder; the gas cylinder weight detection part is arranged at the bottom of the gas cylinder; the electromagnetic valve coil leakage current detection part is connected with the electromagnetic valve; the first gas density detection part is arranged at the outlet of the gas filling pipeline; according to the scheme, the electromagnetic valve is accurately controlled to be opened under the safety condition and the necessary inflation condition by monitoring multiple sets of environment data, gas cylinder data and data of the equipment to be inflated, the SF6 gas supplementing work quality is improved, and the safety of personnel and the equipment is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of substation maintenance equipment technology, and in particular to a filling system, transfer device and method for sulfur hexafluoride cylinders. Background Technology

[0002] With the increasing number of SF6 (sulfur hexafluoride) filling devices in substations, the occurrence of SF6 pressure drops below the rated value is becoming more frequent. If not addressed promptly, this can lead to "SF6 pressure drop" alarms or "SF6 pressure drop lockout," severely impacting the safe operation of the equipment. Once it is confirmed that the pressure drop is due to a leak, SF6 gas should be replenished immediately.

[0003] The gas cylinders weigh up to 100 kilograms, and loading, unloading, and transport all rely entirely on manual labor, lacking auxiliary tools, resulting in low work efficiency and significant personal injury risks. Some GIS rooms are located on the second floor or higher, making cylinder transport extremely difficult. When cylinders are placed on the first floor for filling, long filling hoses must be used to connect them to the GIS equipment on the second floor requiring replenishment, which not only slows down the filling process but also poses significant safety risks. Although SF6 gas is colorless, odorless, and non-toxic, high concentrations in the air can displace oxygen, causing hypoxia. Under high temperature and pressure, SF6 gas decomposes to produce toxic and corrosive fluorides and sulfides, which may damage the nervous and cardiovascular systems. Therefore, current SF6 cylinder replenishment work faces problems of low replenishment quality and efficiency, as well as high safety risks to personnel and equipment. Summary of the Invention

[0004] This invention provides a filling system, transfer device and method for sulfur hexafluoride (SF6) cylinders, which solves the problems of low filling quality and efficiency and high safety risks to personnel and equipment in SF6 cylinder filling work.

[0005] This invention provides a sulfur hexafluoride cylinder filling system, including: a cylinder, a filling connector, a filling pipe, a solenoid valve, a controller, and a filling start detection component. The outlet of the cylinder is connected to the inlet of the filling pipe through the filling connector, and the outlet of the filling pipe is used to connect to the device to be filled. The solenoid valve is located at the outlet of the cylinder to control the release of gas from the cylinder.

[0006] The inflation start detection component includes an ambient oxygen concentration detector, an ambient sulfur hexafluoride gas concentration detector, an ambient humidity detector, and an ambient temperature detector located on one side of the gas cylinder; a gas cylinder micro-water concentration detector located at the gas cylinder outlet; a gas cylinder weight detector located at the bottom of the gas cylinder; a solenoid valve coil leakage current detector connected to the solenoid valve; and a first gas density detector located at the inflation pipe outlet.

[0007] The inflation start detection component is connected to the solenoid valve through the controller. The controller is used to control the solenoid valve to start and release the gas in the gas cylinder based on the oxygen concentration, sulfur hexafluoride gas concentration, humidity and temperature of the gas cylinder environment, as well as the gas cylinder micro-water concentration, gas cylinder weight, solenoid valve coil leakage current and sulfur hexafluoride gas density of the equipment to be inflated, as obtained by the inflation start detection component.

[0008] Furthermore, it also includes an inflation detection component and a hot air blower. The inflation detection component includes an inflation flow detection device installed at the inlet of the inflation pipe and an inflation connector temperature detection device and an inflation connector humidity detection device installed at the inflation connector.

[0009] The inflation flow detection device, the inflation connector temperature detection device, and the inflation connector humidity detection device are connected to the hot air blower via a controller.

[0010] The hot air blower is positioned aligned with the air inlet connector.

[0011] The controller is used to start the hot air blower based on the inflation flow rate of the inflation pipe obtained by the inflation detection component and the temperature and humidity at the inflation joint.

[0012] Furthermore, it also includes a warning component connected to the controller. The inflation detection component further includes a second gas density detector disposed at the inlet of the inflation pipe. The second gas density detector is connected to the controller, which is used to control the closure of the solenoid valve and the hot air blower and send a signal to the warning component based on the density difference of sulfur hexafluoride gas at the inlet and outlet of the inflation pipe monitored and obtained by the inflation detection component, and the sulfur hexafluoride gas density of the equipment to be inflated at the outlet of the inflation pipe.

[0013] This invention also provides a method for filling a sulfur hexafluoride (SF6) cylinder filling system, comprising: when the ambient oxygen concentration is ≥ a preset value, the ambient SF6 concentration is ≤ a preset value, the ambient temperature is within a preset range, the ambient humidity is ≤ a preset value, the cylinder moisture concentration is ≤ a preset value, the device's SF6 density is ≤ a preset value, the cylinder weight is ≥ a preset value, and the solenoid valve coil leakage current is ≤ a preset value, the solenoid valve is activated to release the gas in the cylinder into the device to be filled.

[0014] Furthermore, after the solenoid valve is activated, if the inflation flow rate is less than or equal to the preset inflation flow rate, the inflation connector temperature is less than or equal to the preset inflation connector temperature, and the inflation connector humidity is greater than or equal to the preset inflation connector humidity, the hot air blower is activated.

[0015] Furthermore, after the solenoid valve is activated, if the density difference of sulfur hexafluoride gas at the inlet and outlet of the gas filling pipe is greater than or equal to the density error set value, the solenoid valve and the hot air blower are closed and a signal is sent to the warning component.

[0016] Furthermore, if the density of sulfur hexafluoride gas in the equipment to be filled at the outlet of the filling pipe is greater than or equal to the density stop set value, the solenoid valve and the hot air blower are closed and a signal is sent to the warning component.

[0017] This invention also provides a transfer device based on the sulfur hexafluoride cylinder filling system, including a load-bearing vehicle body, crawling wheels, a drive motor, and an obstacle sensor. The load-bearing vehicle body is used to support and fix the cylinder. The crawling wheels are respectively provided on both sides near the bottom of the load-bearing vehicle body. The crawling wheels are connected to the drive motor. The obstacle sensor is installed on the load-bearing vehicle body to detect the height of obstacles. The obstacle sensor is connected to the drive motor through the controller.

[0018] The controller is used to determine whether the transfer device is in a stair-climbing state based on the height of the obstacle fed back by the obstacle sensor, and to increase the power of the drive motor.

[0019] Furthermore, it also includes a locking assembly. The crawling wheels on both sides are connected by a connecting rod. The locking assembly includes a locking element and an anti-slip wheel. The locking element is connected to the middle of the connecting rod through the anti-slip wheel. The locking assembly is used to control the anti-slip wheel to stay stationary so that the connecting rod and the crawling wheels stop rotating.

[0020] This invention also provides a method for transferring the transfer device of the sulfur hexafluoride cylinder filling system, comprising:

[0021] The controller determines whether there is an obstacle based on the obstacle height data collected by the obstacle sensor;

[0022] When the obstacle height data is less than the obstacle height start-up set value, the controller controls the drive motor to reduce the output power and torque, and start the flat ground mode;

[0023] When the obstacle height start set value ≤ the obstacle height data ≤ the obstacle height stop set value, the controller controls the drive motor to increase the output power and torque, and start the stair climbing mode;

[0024] When the obstacle height data exceeds the obstacle height stop set value, the drive motor is controlled to stop, and the anti-slip wheel is controlled to stop by the locking component, so that the connecting rod and crawling wheel stop rotating.

[0025] As can be seen from the above technical solutions, the present invention has the following advantages:

[0026] On the one hand, this solution accurately controls the solenoid valve to open under safe conditions and when necessary for filling by monitoring multiple sets of environmental data (temperature, humidity, SF6 gas concentration, oxygen concentration), gas cylinder data (SF6 micro-water concentration, solenoid valve coil leakage current, gas cylinder weight), and data of the equipment to be filled (equipment SF6 gas density), thereby improving the quality of SF6 replenishment operations and ensuring the safety of personnel and equipment.

[0027] On the other hand, the transfer device in this solution uses obstacle sensors to detect whether there are obstacles and determine whether it is currently in the climbing state. If it is in the climbing state, it automatically increases the motor power and enters a stable climbing state, thereby improving the gas cylinder transfer efficiency and thus improving the gas cylinder working efficiency. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of a sulfur hexafluoride cylinder filling system provided in an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of a filling method for a sulfur hexafluoride cylinder filling system provided in an embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of the process after the solenoid valve is activated in a method for filling a sulfur hexafluoride cylinder according to an embodiment of the present invention.

[0032] Figure 4 This is a schematic diagram of the structure of a transfer device for a sulfur hexafluoride cylinder filling system provided in an embodiment of the present invention;

[0033] Figure 5 This is a schematic flowchart illustrating a transfer method for a sulfur hexafluoride cylinder filling system provided in an embodiment of the present invention.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. Start button; 2. Handrail; 3. Display screen; 4. Control box; 5. Inflation module; 6. Crawler wheel; 7. Hot air blower; 8. Arc-shaped support plate fixing bracket; 9. Load-bearing bracket; 10. Weighing sensor; 11. Locking assembly. Detailed Implementation

[0036] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0037] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the present application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0038] Please see Figure 1 The present invention provides a sulfur hexafluoride cylinder filling system including: a cylinder, a filling connector, a filling pipe, a solenoid valve, a controller, and a filling start detection component. The outlet of the cylinder is connected to the inlet of the filling pipe through the filling connector, and the outlet of the filling pipe is used to connect to the equipment to be filled. The solenoid valve is set at the outlet of the cylinder to control the release of gas in the cylinder.

[0039] The inflation start detection component includes an ambient oxygen concentration detector, an ambient sulfur hexafluoride gas concentration detector, an ambient humidity detector, and an ambient temperature detector located on one side of the gas cylinder; a gas cylinder micro-water concentration detector located at the gas cylinder outlet; a gas cylinder weight detector located at the bottom of the gas cylinder; a solenoid valve coil leakage current detector connected to the solenoid valve; and a first gas density detector located at the inflation pipe outlet.

[0040] The inflation start detection component is connected to the solenoid valve via a controller. The controller is used to control the solenoid valve to start and release the gas in the gas cylinder based on the oxygen concentration, sulfur hexafluoride gas concentration, humidity and temperature of the gas cylinder environment, as well as the gas cylinder's micro-water concentration, gas cylinder weight, solenoid valve coil leakage current, and sulfur hexafluoride gas density of the equipment to be inflated, as obtained by the inflation start detection component.

[0041] Understandably, in practical implementation, the detection function of the inflation start-up detection component is explained as follows:

[0042] Ambient oxygen concentration detection device:

[0043] SF6 (sulfur hexafluoride) gas is a colorless, odorless, non-toxic, non-corrosive, non-flammable, and non-explosive gas at normal temperature and pressure. Its density is approximately 5.1 times that of air. When the concentration of SF6 in the air is high, it displaces oxygen, causing symptoms of oxygen deficiency. When working in the low-level area of ​​SF6 electrical equipment, the oxygen content in the air should not be lower than 19.5%.

[0044] Therefore, this embodiment sets up an ambient oxygen concentration detector. Only when the detected ambient oxygen concentration is greater than or equal to a preset value can the solenoid valve be opened to release the gas in the gas cylinder to prevent people from experiencing hypoxia symptoms.

[0045] Environmental sulfur hexafluoride gas concentration detection device:

[0046] Under high temperature and high pressure conditions, SF6 gas decomposes to produce toxic and corrosive products such as fluorides and sulfides, which may damage the human nervous system and cardiovascular system. When working in the low-level area of ​​SF6 electrical equipment, the SF6 gas content in the air should not exceed 1000uL / L.

[0047] Therefore, this embodiment sets up an ambient sulfur hexafluoride gas concentration detector. Only when the detected ambient sulfur hexafluoride gas concentration is ≤ a preset value can the solenoid valve be opened to release the gas in the cylinder to avoid poisoning symptoms in people.

[0048] Environmental humidity detection equipment:

[0049] When replenishing gas, the relative humidity of the environment should be ≤80%. Avoid operating in high humidity weather such as rain, snow, or fog. If the ambient humidity is too high, dehumidification measures can be taken or the gas replenishment operation can be carried out after the environmental conditions improve.

[0050] During the SF6 gas replenishment process, if the ambient humidity is too high, moisture in the air may enter the SF6 gas through cylinder valves, connecting pipes, etc., causing the gas humidity to exceed the standard. Under the influence of an electric arc, moisture decomposes to produce harmful substances such as sulfurous acid and hydrofluoric acid. These substances are corrosive and will severely corrode internal equipment components, reduce insulation performance, and even cause equipment failure. Simultaneously, high humidity accelerates the aging of the sealing rings in the SF6 replenishment device, leading to decreased sealing performance and increasing the risk of leakage.

[0051] Therefore, this embodiment sets up an ambient humidity detection device. When the detected ambient humidity is less than or equal to the preset ambient humidity value, the solenoid valve can be opened to release the gas in the cylinder. This prevents moisture in the air from entering the SF6 gas through the solenoid valve, filling connector, and filling pipe if the ambient humidity is too high. This avoids severe corrosion of internal equipment components, reduced insulation performance, and even equipment failure.

[0052] Ambient temperature sensing device:

[0053] According to the ideal gas law PV=nRT (where P is pressure, V is volume, n is amount of substance, R is a constant, and T is temperature), temperature is directly proportional to pressure when volume and amount of substance remain constant. The pressure of SF6 gas changes with temperature; generally, a 1°C change in temperature will change the SF6 pressure by approximately 0.003 MPa. Replenishment should ideally be performed in an environment between 5°C and 40°C. During replenishment, if the ambient temperature is low, the gas pressure inside the cylinder will be relatively low, potentially leading to slow replenishment or even failure to complete the process. At higher ambient temperatures, the SF6 gas pressure inside the cylinder will increase, potentially accelerating the replenishment process. However, if the ambient temperature is too high, the pressure inside the cylinder may exceed the safety threshold, increasing the risk of leakage or explosion. Both excessively high and low pressures can affect the insulation performance and arc-extinguishing capability of equipment. Furthermore, low temperatures can cause the materials of SF6 cylinder valves, pipes, and other components to become brittle. High temperatures may cause discomfort to operators, affecting the accuracy and efficiency of operations. In addition, high temperatures may accelerate the aging of the cylinders and related equipment.

[0054] Therefore, this embodiment sets up an ambient temperature detection device so that the solenoid valve can be opened to release the gas in the gas cylinder only when the detected ambient temperature is within the preset range, thus avoiding slow gas replenishment or even failure to complete the process, or increasing the risk of leakage or explosion.

[0055] Gas cylinder trace moisture concentration detection device:

[0056] SF6 equipment is extremely sensitive to moisture; standards typically require a trace moisture content of ≤150 ppm. Moisture can react with SF6 decomposition products (such as HF generated by electric arcs), The reaction produces hydrofluoric acid (HF) and sulfuric acid (HF). Corrosive substances such as SF6 can damage internal metal components and insulation materials. When SF6 gas contains more moisture than specified, this moisture may condense on the solid insulation surface, making it damp and reducing the surface discharge voltage of the equipment. This can lead to flashover and other faults during operation, affecting the safe and stable operation of the power system. Liquid water or condensation will reduce the dielectric strength of SF6, increase the risk of partial discharge or breakdown, and degrade insulation performance.

[0057] Therefore, this embodiment sets up a gas cylinder moisture concentration detection device. Only when the gas cylinder moisture concentration is less than or equal to the preset value can the solenoid valve be opened to release the gas in the gas cylinder, thus avoiding flashover and other malfunctions during the operation of the filling equipment after it has been filled.

[0058] First gas density detection device:

[0059] Density is the mass of SF6 gas per unit volume, reflecting the tightness of the packing of gas molecules. Insufficient density reduces the insulation and arc-extinguishing properties of SF6. In SF6 equipment, density is primarily used to monitor the gas's mass and condition; by measuring density, it can be determined whether there is a gas leak or whether gas replenishment is needed.

[0060] Therefore, in this embodiment, a first gas density detector is installed at the outlet of the inflation pipe. When the SF6 gas density at the outlet of the inflation pipe, i.e., the density of the equipment to be inflated, is less than or equal to the preset value of the sulfur hexafluoride density of the equipment to be inflated, it is determined that the sulfur hexafluoride density of the equipment to be inflated is low, and the necessary condition for inflation is met. Only then can the solenoid valve be opened to release the gas in the gas cylinder.

[0061] Gas cylinder weight detection piece:

[0062] SF6 exists in liquid form in the gas cylinder. Measuring the weight of the cylinder before and after replenishment allows you to determine the remaining SF6 level. This prevents insufficient SF6 during replenishment, which could disrupt operations.

[0063] Therefore, this embodiment sets up a cylinder weight detection device so that the solenoid valve can be opened to release the gas in the cylinder when the cylinder weight is greater than or equal to the preset cylinder weight value, thus avoiding insufficient SF6 in the cylinder and affecting the filling operation.

[0064] Solenoid valve coil leakage current detection device:

[0065] The leakage current of the solenoid valve coil reflects the operating status of the solenoid valve. The opening and closing of the solenoid valve controls the start and stop of the gas replenishment process. When the leakage current data of the solenoid valve coil is abnormal, it indicates that the solenoid valve is malfunctioning and cannot accurately control the start and stop of the gas replenishment process, leading to overcharging or undercharging. If the solenoid valve fails to close after the gas replenishment process is completed, SF6 will leak into the air.

[0066] Therefore, this embodiment sets up a solenoid valve coil leakage current detection device. Only when the leakage current of the solenoid valve coil is less than or equal to the micro current preset value can the solenoid valve be opened to release the gas in the gas cylinder, thus avoiding the solenoid valve malfunction from affecting the control accuracy of the gas supply or causing SF6 gas to leak into the air.

[0067] In summary, this embodiment controls the release of gas from the cylinder by using the oxygen concentration, sulfur hexafluoride gas concentration, humidity, and temperature of the cylinder environment, the micro-water concentration in the cylinder, the cylinder weight, and the leakage current of the solenoid valve coil, obtained from the inflation start detection component. This effectively improves the quality of SF6 replenishment operations and ensures the personal safety of maintenance personnel and the operational safety of equipment.

[0068] In a more specific embodiment, it also includes an inflation detection component and a hot air blower 7. The inflation detection component includes an inflation flow detection device disposed at the inlet of the inflation pipe and an inflation connector temperature detection device and an inflation connector humidity detection device disposed at the inflation connector.

[0069] The inflation flow detection device, the inflation connector temperature detection device, and the inflation connector humidity detection device are connected to the hot air blower 7 via a controller;

[0070] The hot air blower 7 is positioned aligned with the air inlet connector;

[0071] The controller is used to start the hot air blower 7 based on the inflation flow rate of the inflation pipe obtained by the detection component during inflation and the temperature and humidity at the inflation joint.

[0072] Understandably, in practical implementation, the function of the inflation detection component is explained as follows:

[0073] Inflation flow detection device:

[0074] The inflation flow detection device uses a flow meter to count the instantaneous flow and cumulative flow. The instantaneous flow directly reflects the inflation speed, while the cumulative flow can count the total amount of inflation.

[0075] Inflation connector humidity sensor, inflation connector temperature sensor:

[0076] In high-humidity environments, moisture easily adheres to the filling port during SF6 gas replenishment. If the port is not thoroughly cleaned, moisture can enter the equipment along with the SF6 gas, increasing the internal humidity. During replenishment, the gas in the SF6 cylinder changes from liquid to gas, absorbing a significant amount of heat, which may cause frost to form on the filling port and pipes. If the ambient humidity is too high, the frosted areas may absorb moisture from the air and freeze, clogging pipes or damaging seals. Frost on the filling port during replenishment causes a drop in temperature around the port, and the narrowed filling port significantly slows down the replenishment process.

[0077] It should be noted that if the ambient temperature is too high, the pressure inside the gas cylinder may exceed the safety threshold, increasing the risk of leakage or explosion. The hot air blower 7 should only be started when it is confirmed that the interface is frosted. If only "temperature ≤ preset value + humidity ≥ preset value", it may simply mean "low temperature and high humidity but no frost" (for example, the temperature has just reached the freezing point, the humidity has just reached the standard, and the moisture has not yet condensed into visible frost, only in a "critical state"); if only "flow rate ≤ preset value", it may be due to mechanical blockage (such as interface jamming), which is unrelated to frost; only when all three conditions are met simultaneously: low temperature provides the temperature conditions for frost, high humidity provides the moisture source for frost, and the decrease in flow rate proves that frost / ice has formed and blocked the channel - only then can it be indirectly but definitively determined that the interface is frosted, which meets the premise that the hot air blower 7 should only be started when it is confirmed that the interface is frosted.

[0078] Therefore, this embodiment installs a flow detection device at the inlet of the inflation pipe and inflation connector humidity and temperature detection devices at the inflation connector. The hot air blower 7 is activated only when the inflation flow rate is less than or equal to a preset value, the inflation connector temperature is less than or equal to a preset value, and the inflation connector humidity is greater than or equal to a preset value. In other words, this embodiment determines that the hot air blower 7 will only be activated when the interface is frosted due to high ambient humidity, low temperature, and low inflation flow rate at the inflation connector, thus avoiding the risk of excessively high ambient temperature caused by incorrect activation of the hot air blower 7. The hot air blower 7 provides heating, improving inflation efficiency.

[0079] In a more specific embodiment, a warning component is also included, which is connected to the controller. The inflation detection component further includes a second gas density detector disposed at the inlet of the inflation pipe. The second gas density detector is connected to the controller, which is used to control the closure of the solenoid valve and the hot air blower 7 and send a signal to the warning component based on the density difference of sulfur hexafluoride gas at the inlet and outlet of the inflation pipe monitored and obtained by the inflation detection component, as well as the sulfur hexafluoride gas density of the equipment to be inflated at the outlet of the inflation pipe.

[0080] Understandably, in practice, by monitoring the SF6 density at the inlet and outlet of the inflation pipe and calculating the difference between the two, it can be determined whether there is any damage or leakage in the inflation pipe. When the density difference of sulfur hexafluoride gas at the inlet and outlet of the inflation pipe is greater than or equal to the density error setting value, there is a damage or leakage. In this case, the electromagnetic and hot air blower 7 should be turned off, an alarm should be issued, inflation should be stopped, and the inflation device should be inspected and repaired.

[0081] If the density of sulfur hexafluoride gas in the equipment to be filled at the outlet of the filling pipe is greater than or equal to the density stop value, then there is enough sulfur hexafluoride gas in the equipment to be filled. An alarm will be issued, filling will be stopped, and the equipment will be removed from the filling device.

[0082] In a more specific embodiment, the alert component is used for job start and stop notifications, and for audible and visual alarms for abnormal operating conditions.

[0083] In a more specific embodiment, a display screen 3 is also included, which is used to display the lithium battery power level, data collected by the sensors, and system operating status.

[0084] Please see Figure 2 This invention provides a method for filling a sulfur hexafluoride cylinder filling system, comprising:

[0085] When the following conditions are met simultaneously: ambient oxygen concentration ≥ ambient oxygen concentration preset value, ambient sulfur hexafluoride concentration ≤ ambient sulfur hexafluoride concentration preset value, ambient temperature within the ambient temperature preset range, ambient humidity ≤ ambient humidity preset value, gas cylinder moisture concentration ≤ gas cylinder moisture concentration preset value, sulfur hexafluoride density of the equipment to be filled ≤ gas cylinder sulfur hexafluoride density preset value, gas cylinder weight ≥ gas cylinder weight preset value, and solenoid valve coil leakage current ≤ micro current preset value, the solenoid valve is activated to release the gas in the gas cylinder into the equipment to be filled.

[0086] Understandably, in practice, by monitoring multiple sets of environmental data (temperature, humidity, SF6 gas concentration, oxygen concentration), gas cylinder data (SF6 micro-water concentration, solenoid valve coil leakage current, gas cylinder weight), and data from the equipment to be filled (equipment SF6 gas density), the solenoid valve is accurately controlled to open and release gas from the cylinder under safe and necessary conditions. This effectively improves the quality of SF6 replenishment operations and ensures the safety of personnel and equipment.

[0087] In a more specific embodiment, such as Figure 3 As shown, after the solenoid valve is started, if the inflation flow rate is less than or equal to the preset inflation flow rate, the inflation connector temperature is less than or equal to the preset inflation connector temperature, and the inflation connector humidity is greater than or equal to the preset inflation connector humidity, the hot air blower 7 will be started.

[0088] Understandably, in practice, monitoring the temperature, humidity, and air flow at the inflation connector can accurately determine whether the inflation connector is frosted, thus preventing the hot air blower 7 from being accidentally started and increasing the risk of raising the ambient temperature.

[0089] In a more specific embodiment, after the solenoid valve is activated, if the density difference of sulfur hexafluoride gas at the inlet and outlet of the gas filling pipe is greater than or equal to the density error set value, the solenoid valve and the hot air blower 7 are closed and a signal is sent to the warning component.

[0090] Understandably, in practice, monitoring the density difference data at the inlet and outlet of the inflation pipe to check for leaks will control the hot air blower 7 and the solenoid valve to stop and issue warnings for maintenance.

[0091] In a more specific embodiment, if the density of sulfur hexafluoride gas at the outlet of the gas filling pipe is greater than or equal to the density stop set value, the solenoid valve and the hot air blower 7 are shut off and a signal is sent to the warning component.

[0092] Understandably, in practice, the hot air blower 7 and solenoid valve are stopped and the inflation system is removed via a transfer device when the SF6 gas density of the equipment to be inflated is used to determine whether the gas in the equipment is sufficient.

[0093] Please see Figure 4 This invention also provides a transfer device for a sulfur hexafluoride cylinder filling system, including a load-bearing vehicle body, crawler wheels 6, a drive motor, and an obstacle sensor. The load-bearing vehicle body is used to support and fix the cylinder. Crawler wheels 6 are respectively provided on both sides near the bottom of the load-bearing vehicle body. The crawler wheels 6 are connected to the drive motor. The obstacle sensor is installed on the load-bearing vehicle body to detect the height of obstacles. The obstacle sensor is connected to the drive motor through a controller.

[0094] The controller is used to determine whether the transfer device is in a stair-climbing state based on the height of the obstacle fed back by the obstacle sensor, and to increase the power of the drive motor.

[0095] Understandably, in practice, when the transfer device needs to climb stairs, it increases the power of the drive motor upon detecting obstacles. During stair climbing, the rotational speed typically needs to remain stable to avoid stalling; therefore, the torque needs to increase with the increase in resistance, necessitating a corresponding increase in power. By actively increasing the power, sufficient torque is provided to overcome obstacles and offset the additional resistance, while maintaining continuous movement to prevent instability and avoiding damage to the motor due to passive overload. Ultimately, this ensures the device can efficiently and safely complete the stair climbing task. Actively increasing the motor power facilitates the smooth transport of SF6 gas cylinders up stairs, preventing them from slipping due to gravity and ensuring safe handling.

[0096] In a more specific embodiment, a locking assembly 11 is also included, with the crawling wheels 6 on both sides connected by a connecting rod. The locking assembly 11 includes a locking element and an anti-slip wheel. The locking element is connected to the middle of the connecting rod through the anti-slip wheel. The locking assembly 11 is used to control the anti-slip wheel to be stationary so that the connecting rod and the crawling wheels 6 stop rotating.

[0097] Understandably, by locking, component 11 improves the stability of the transfer device when it is stationary.

[0098] In a more specific embodiment, such as Figure 4 As shown, the transfer device also includes a start button 1, a handrail 2, a display screen 3, a control box 4, an inflation module 5, a hot air blower 7, an arc-shaped pallet fixing bracket 8, a load-bearing bracket 9, a weighing sensor 10, and a locking assembly 11.

[0099] The control box 4 consists of an oxygen concentration sensor, an SF6 sensor, a temperature and humidity sensor, an ultrasonic sensor, a micro-water tester, a drive motor, and a lithium battery power supply. The inflation module 5 adopts an integrated design, connecting the inflation connector, inflation pipe, solenoid valve, SF6 digital density meter, and other tools. The arc-shaped support plate fixing bracket 8 is designed according to the size of the SF6 cylinder, with anti-collision mechanisms and EVA anti-slip ring protective sleeves in key parts. The bracket is equipped with a quick cylinder fixing mechanism. The load-bearing bracket 9 is made of high-temperature resistant bakelite board, profiles, and steel plates bent and welded, with a rust-proof coating.

[0100] In a more specific embodiment, the anti-slip wheels are made of polyurethane material, and the crawling wheels 6 are made of rubber pneumatic tires. Anti-slip chains are provided to prevent slipping backwards due to gravity while climbing the ladder; they can also be locked when stopped in place.

[0101] Please see Figure 5 The present invention also provides a transfer method for a transfer device: the controller determines whether there is an obstacle based on the obstacle height data collected by the obstacle sensor;

[0102] When the obstacle height data is less than the obstacle height start-up set value, the controller controls the drive motor to reduce the output power and torque, and starts the flat ground mode;

[0103] When the obstacle height start set value ≤ obstacle height data ≤ obstacle height stop set value, the controller controls the drive motor to increase the output power and torque, and starts the stair climbing mode;

[0104] When the obstacle height data exceeds the obstacle height stop set value, the drive motor is stopped, and the anti-slip wheel is stopped by the locking component 11, so that the connecting rod and crawling wheel 6 stop rotating.

[0105] Understandably, in practice, when the obstacle height data is between the obstacle height start-up setpoint and the obstacle height stop-down setpoint, the object is determined to be an obstacle, and the transport device has the height capability to climb over this obstacle, thus initiating the stair-climbing mode. If the obstacle height data is less than the obstacle height start-up setpoint, the object is determined not to be an obstacle (obstacle height too low), and the flat ground mode is initiated. If the detected object height data is greater than the obstacle height stop-down setpoint, the object is determined to be a wall (height too high, the transport device cannot climb over), and the transport device will stop in place.

[0106] In a more specific embodiment, the transfer device of this embodiment will select the flat ground mode if there are no obstacles; if there are obstacles and it is determined to be stairs, it will select the stair-climbing mode. The controller can automatically set the drive motor power according to the device's movement mode and distance, thereby adjusting the movement speed. When the device moves to the work location, the controller controls the drive motor to stop, and a locking component 11 locks the device in place.

[0107] In a more specific implementation, the obstacle displacement monitoring component includes ultrasonic sensors.

[0108] In a more specific implementation, the warning components include an audible and visual alarm and a display screen 3.

[0109] The specific workflow of the transfer device is as follows:

[0110] The controller can determine whether there is an obstacle based on the data collected by the ultrasonic sensor;

[0111] The controller can be set to start and stop obstacle height settings.

[0112] When the obstacle height data is less than the obstacle height start-up set value, the controller controls the drive motor to reduce the output power and torque, and starts the flat ground mode;

[0113] When the obstacle height start set value ≤ obstacle height data ≤ obstacle height stop set value, the controller controls the drive motor to increase the output power and torque, and starts the stair climbing mode;

[0114] When the obstacle height data exceeds the obstacle height stop set value, the drive motor is stopped, and the anti-slip wheel is stopped by the locking component 11, so that the connecting rod and crawling wheel 6 stop rotating.

[0115] Understandably, in practice, the crawling wheels 6 and the drive motor provide power for the transfer of gas cylinders. When the transfer device needs to climb stairs, the power of the drive motor needs to be increased once an obstacle on the stairs is detected. During the stair climbing process, by actively increasing the power, not only can sufficient torque be provided to overcome additional resistance, but also the continuity of movement can be maintained to prevent the device's center of gravity from becoming unstable, ensuring that the device can complete the stair climbing task efficiently and safely.

[0116] In a more specific embodiment, the controller can automatically control the operating mode of the crawler wheel 6 according to the device's movement mode:

[0117] When the device is in flat ground mode, the controller controls one of the crawling wheels 6 to be fixed on the ground and never in contact with the ground; the other two wheels are always in contact with the ground and roll close to the ground.

[0118] When the device is in stair-climbing mode, the controller controls the three tires of the crawling wheel 6 to contact the ground in sequence and roll in a cycle.

[0119] The controller can detect the working status of the crawler wheel 6. When the tire locks up or leaks air, the controller will stop the drive motor, activate the audible and visual alarm to provide a voice prompt and turn the indicator light red, and control the display screen 3 to display data information.

[0120] Operators can manually set different power values ​​for the drive motor to adjust the moving speed of the device.

[0121] The drive motor is equipped with overload and short circuit protection, and can automatically stop in case of overload or short circuit. The drive motor can send the operating status to the controller, triggering an audible and visual alarm with voice prompts and a red indicator light, and displaying data information on the control display screen 3.

[0122] When the device stops in place, the controller stops the drive motor and the locking component 11 locks the device in place to prevent the device from sliding and causing personal injury or equipment damage.

[0123] In summary, this solution, on the one hand, accurately determines whether the inflation joint is frosted by monitoring the temperature, humidity, and inflation flow rate at the inflation joint, thus avoiding accidental activation of the hot air blower and increasing the risk of raising the ambient temperature; on the other hand, it accurately controls the opening of the solenoid valve under safe and necessary conditions by monitoring multiple sets of environmental data (temperature, humidity, SF6 gas concentration, oxygen concentration), gas cylinder data (SF6 micro-water concentration, solenoid valve coil leakage current, gas cylinder weight), and the SF6 gas density of the equipment to be inflated, thereby improving the quality of SF6 replenishment operations and ensuring the safety of personnel and equipment; by monitoring the density difference data at the inlet and outlet of the inflation pipeline, it determines whether there is a pipeline leak, thereby controlling the hot air blower and solenoid valve to stop for maintenance; and by using the SF6 gas density of the equipment to be inflated to determine whether the gas in the equipment is sufficient, it controls the hot air blower and solenoid valve to stop, and removes the inflation system through a transfer device.

[0124] On the other hand, the transfer device in this solution uses obstacle sensors to detect whether there are obstacles and determine whether it is currently in the stair-climbing state. If it is in the stair-climbing state, it automatically increases the motor power and enters a stable stair-climbing state.

[0125] This solution effectively improves the quality of SF6 replenishment operations by using sensor data from multiple sets of detection devices, promptly detecting SF6 leaks and frost formation on filling joints, preventing accidents caused by insufficient insulation performance leading to short circuits and power outages in substation equipment, ensuring the safety of personnel and equipment, and improving replenishment efficiency and human-machine interaction through transfer devices and methods.

[0126] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications 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 the present invention.

Claims

1. A sulfur hexafluoride gas cylinder filling system, characterized in that, include: The system includes a gas cylinder, an inflation connector, an inflation pipe, a solenoid valve, a controller, and an inflation start detection component. The outlet of the gas cylinder is connected to the inlet of the inflation pipe via the inflation connector. The outlet of the inflation pipe is used to connect to the device to be inflated. The solenoid valve is located at the outlet of the gas cylinder to control the release of gas from the gas cylinder. The inflation start detection component includes an ambient oxygen concentration detector, an ambient sulfur hexafluoride gas concentration detector, an ambient humidity detector, and an ambient temperature detector located on one side of the gas cylinder; a gas cylinder micro-water concentration detector located at the gas cylinder outlet; a gas cylinder weight detector located at the bottom of the gas cylinder; a solenoid valve coil leakage current detector connected to the solenoid valve; and a first gas density detector located at the inflation pipe outlet. The inflation start detection component is connected to the solenoid valve through the controller. The controller is used to control the solenoid valve to start and release the gas in the gas cylinder based on the oxygen concentration, sulfur hexafluoride gas concentration, humidity and temperature of the gas cylinder environment, as well as the gas cylinder micro-water concentration, gas cylinder weight, solenoid valve coil leakage current and sulfur hexafluoride gas density of the equipment to be inflated, as obtained by the inflation start detection component.

2. The sulfur hexafluoride cylinder filling system according to claim 1, characterized in that, It also includes an inflation detection component and a hot air blower. The inflation detection component includes an inflation flow detection device installed at the inlet of the inflation pipe and an inflation connector temperature detection device and an inflation connector humidity detection device installed at the inflation connector. The inflation flow detection device, the inflation connector temperature detection device, and the inflation connector humidity detection device are connected to the hot air blower through the controller. The hot air blower is positioned aligned with the air inlet connector. The controller is used to start the hot air blower based on the inflation flow rate of the inflation pipe obtained by the inflation detection component and the temperature and humidity at the inflation joint.

3. The sulfur hexafluoride cylinder filling system according to claim 2, characterized in that, It also includes a warning component connected to the controller. The inflation detection component further includes a second gas density detector disposed at the inlet of the inflation pipe. The second gas density detector is connected to the controller, which is used to control the closing of the solenoid valve and the hot air blower and send a signal to the warning component based on the density difference of sulfur hexafluoride gas at the inlet and outlet of the inflation pipe monitored and obtained by the inflation detection component, and the sulfur hexafluoride gas density of the equipment to be inflated at the outlet of the inflation pipe.

4. A method for filling a sulfur hexafluoride cylinder based on the filling system of any one of claims 1-3, characterized in that, include: When the following conditions are met simultaneously: ambient oxygen concentration ≥ ambient oxygen concentration preset value, ambient sulfur hexafluoride concentration ≤ ambient sulfur hexafluoride concentration preset value, ambient temperature within ambient temperature preset range, ambient humidity ≤ ambient humidity preset value, gas cylinder moisture concentration ≤ gas cylinder moisture concentration preset value, sulfur hexafluoride density of the equipment to be filled ≤ gas cylinder sulfur hexafluoride density preset value, gas cylinder weight ≥ gas cylinder weight preset value, and solenoid valve coil leakage current ≤ micro current preset value, the solenoid valve is activated to release the gas in the gas cylinder into the equipment to be filled.

5. The inflation method according to claim 4, characterized in that, After the solenoid valve is activated, if the inflation flow rate is less than or equal to the preset inflation flow rate, the inflation connector temperature is less than or equal to the preset inflation connector temperature, and the inflation connector humidity is greater than or equal to the preset inflation connector humidity, the hot air blower will be activated.

6. The inflation method according to claim 5, characterized in that, After the solenoid valve is activated, if the density difference of sulfur hexafluoride gas at the inlet and outlet of the gas filling pipe is greater than or equal to the density error set value, the solenoid valve and the hot air blower are closed and a signal is sent to the warning component.

7. The inflation method according to claim 6, characterized in that, If the density of sulfur hexafluoride gas in the equipment to be filled at the outlet of the filling pipe is greater than or equal to the density stop set value, the solenoid valve and the hot air blower are closed and a signal is sent to the warning component.

8. A transfer device based on the sulfur hexafluoride cylinder filling system according to any one of claims 1-3, characterized in that, The system includes a load-bearing vehicle body, crawler wheels, a drive motor, and an obstacle sensor. The load-bearing vehicle body is used to support and secure the gas cylinder. Crawler wheels are respectively installed on both sides of the load-bearing vehicle body near the bottom. The crawler wheels are connected to the drive motor. The obstacle sensor is installed on the load-bearing vehicle body to detect the height of obstacles. The obstacle sensor is connected to the drive motor via a controller. The controller is used to determine whether the transfer device is in a stair-climbing state based on the height of the obstacle fed back by the obstacle sensor, and to increase the power of the drive motor.

9. A transfer device according to claim 8, characterized in that, It also includes a locking component. The crawling wheels on both sides are connected by a connecting rod. The locking assembly includes a locking element and an anti-slip wheel. The locking element is connected to the middle of the connecting rod through the anti-slip wheel. The locking assembly is used to control the anti-slip wheel to be stationary so that the connecting rod and the crawling wheels stop rotating.

10. A transfer method for a transfer device based on the sulfur hexafluoride cylinder filling system of claim 9, characterized in that, include: The controller determines whether there is an obstacle based on the obstacle height data collected by the obstacle sensor; When the obstacle height data is less than the obstacle height start-up set value, the controller controls the drive motor to reduce the output power and torque, and start the flat ground mode; When the obstacle height start set value ≤ the obstacle height data ≤ the obstacle height stop set value, the controller controls the drive motor to increase the output power and torque, and start the stair climbing mode; When the obstacle height data exceeds the obstacle height stop set value, the drive motor is controlled to stop, and the anti-slip wheel is controlled to stop by the locking component, so that the connecting rod and crawling wheel stop rotating.

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