A connector for an automatic inflation device for SF6 electrical equipment, and an automatic inflation device.

Abstract

This application relates to a connector structure, addressing the technical problem in existing automatic inflation connectors where prolonged connection of the inflation tube leads to the check valve pin at the inflation port easily rebounding and failing due to prolonged pressure, resulting in air leakage after disconnection. The application provides an automatic inflation device connector and automatic inflation device for SF6 electrical equipment. By incorporating a linear drive mechanism within the housing, the inflation tube, on which the pin assembly is mounted, moves axially. This allows the pin assembly to open the inflation port during inflation and promptly retract and close the port after inflation stops, thereby reducing the risk of the check valve remaining in a working state for extended periods and improving the sealing reliability and service life of the inflation port. Simultaneously, the sliding fit between the support and the housing improves the stability of the inflation tube's movement, and the external sealing part of the pin enhances the sealing performance of the inflation connection.

Description

Technical Field

[0001] This application pertains to a connector structure, specifically relating to a connector for an automatic inflation device for SF6 electrical equipment and an automatic inflation device. Background Technology

[0002] SF6 electrical equipment may experience slow gas leakage during operation. In situations where power outages are not possible for maintenance, it is usually necessary to replenish gas to maintain normal operation. Therefore, an automatic gas replenishment device is required to reduce the frequency of manual gas replenishment. However, when the existing automatic gas replenishment device is connected to the gas inlet for a long period of time, the check valve pin at the gas inlet is prone to continuous pressure, leading to rebound failure and gas leakage after disconnection. Insufficient pipe flushing before gas replenishment can also affect the reliability of gas replenishment.

[0003] For the opening and closing of the gas-filled connector, existing solutions mainly involve using the back-and-forth movement of an internal pin to open and close the check valve, or manually rotating the nut to move the pin. For pipe cleaning, vacuuming or direct introduction of high-pressure SF6 gas is typically used. However, the internal pin-moving design is structurally complex and requires high sealing, while the manual nut-rotation method suffers from difficulties in torque control, loosening and leakage, and precise control of the pin stroke. Furthermore, existing pipe cleaning methods have limited effectiveness in cleaning bent pipes and result in significant SF6 emissions. Summary of the Invention

[0004] This application addresses the technical problem in existing automatic inflation connectors where the long-term connection of the inflation pipe causes the anti-reverse valve pin at the inflation port to easily rebound and fail after prolonged pressure, and leads to air leakage after disconnection. The application provides an automatic inflation device connector for SF6 electrical equipment and an automatic inflation device.

[0005] To achieve the above objectives, this application adopts the following technical solution: In a first aspect, this application proposes an automatic inflation device connector for SF6 electrical equipment, used to connect an inflation port and an inflation pipe; including an inflation connector component, a housing, a linear drive mechanism, and a pin assembly; The linear drive mechanism is located inside the housing, and a support is installed at the output end of the linear drive mechanism. The support slides in conjunction with the inside of the housing. The inflation tube is mounted on the support and is fitted inside the housing; The ejector pin assembly is installed at the front end of the inflation tube. The ejector pin assembly includes an ejector pin and a sealing part, and the sealing part is sleeved on the outside of the ejector pin. The inflation connector is connected to the front end of the housing and is used to connect to the inflation port.

[0006] Furthermore, the front end of the ejector pin is frustum-shaped, and the sealing part is sleeved on the outside of the front end of the ejector pin.

[0007] Furthermore, the linear drive mechanism employs an electric push rod.

[0008] Furthermore, the inflatable connector is a nut.

[0009] Furthermore, the support member is a plate-shaped structure, with its bottom slidingly engaging with the inner wall of the shell, and its top forming an arc shape that fits the outer wall of the inflation tube.

[0010] Furthermore, it also includes a flexible ejector pin adapter assembly connecting the inflation port and the housing; the flexible ejector pin adapter assembly includes an outer tube, a constraint tube, and a flexible ejector pin; The outer tube is sleeved outside the constraint tube, and the flexible ejector is installed inside the constraint tube. The outer tube, the constraint tube, and the flexible ejector are coaxially arranged. The inflation connector is installed at the front end of the outer tube, and the rear end of the outer tube is connected to the shell; The front end of the flexible ejector pin is used to interact with the air inlet, and the rear end of the flexible ejector pin is connected to the ejector pin.

[0011] Furthermore, the flexible ejector pin is installed inside the constraint tube via a constraint tube bracket; The constraint tube support includes multiple support columns evenly distributed along the circumference of the constraint tube.

[0012] Furthermore, it also includes an adapter for the inflation port; The adapter inflation port is connected between the outer tube and the front end of the shell.

[0013] Secondly, this application proposes an automatic inflation device, including an inflation port and an inflation pipe; it also includes the aforementioned SF6 electrical equipment automatic inflation device connector; The SF6 electrical equipment automatic inflation device connector is connected between the inflation port and the inflation pipe.

[0014] Furthermore, on the portion of the inflation tube extending to the outside of the housing, a cleaning solenoid valve, a densitometer, and a check valve are sequentially arranged from front to back at the rear end of the inflation tube.

[0015] Compared with the prior art, this application has the following beneficial effects: This application proposes an automatic inflation device connector for SF6 electrical equipment, comprising an inflation connector, a housing, a linear drive mechanism, and a pin assembly. The linear drive mechanism is located inside the housing, and its output end is fitted with a support member that slides within the housing. The inflation pipe is mounted on the support member, and the pin assembly is mounted on the front end of the inflation pipe, with a sealing portion sleeved on the outside of the pin. This allows the inflation connector to be connected to the inflation port, and the linear drive mechanism to drive the inflation pipe to move axially back and forth within the housing. This enables the pin assembly to open the inflation port when inflation is needed and to promptly retract and close the inflation port after inflation stops. This avoids the problem in the prior art where the inflation port check valve pin is continuously in working condition when the inflation pipe is connected for a long time. It also helps to reduce the continuous stress time of the elastic element inside the check valve and reduces the risk of air leakage in the chamber caused by the pin not rebounding due to long-term operation. Meanwhile, by slidingly engaging the support member within the housing and using the support member to install and support the inflation tube, the movement trajectory of the inflation tube can be constrained, ensuring a relatively stable axial movement during reciprocating motion and reducing the adverse effects of radial sway on connection reliability and opening accuracy. Furthermore, by providing a sealing part on the outside of the ejector pin, a corresponding sealing fit can be formed during the interaction between the ejector pin assembly and the inflation port, which helps improve the connection sealing and inflation stability during the inflation process. Therefore, this application not only enables controlled opening and closing of the inflation port but also improves the service life of the inflation interface, sealing reliability, and the safety of automatic inflation operations. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the connector for the automatic inflation device of SF6 electrical equipment in Embodiment 2 of this application; Figure 2 This is a schematic diagram of the automatic inflation device in Embodiment 2 of this application; Figure 3 This is a schematic diagram of the flexible ejector pin adapter assembly in Embodiment 3 of this application.

[0018] Among them, 1-inflation port, 2-inflation tube, 3-inflation connector, 4-shell, 5-linear drive mechanism, 6-ejector assembly, 7-support component, 8-outer tube, 9-constraint tube, 10-flexible ejector, 11-constraint tube bracket, 12-converter inflation port, 13-cleaning solenoid valve, 14-densitometer, 15-check valve. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0021] In the description of the embodiments of this application, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0022] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0023] In the description of the embodiments of this application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0024] SF6 electrical equipment is widely used in gas-insulated switchgear, ring main units, and other enclosed high-voltage electrical installations. SF6, or sulfur hexafluoride, is a commonly used insulating and arc-quenching gas that provides a stable electrical insulation environment for equipment. During long-term operation, slow leakage can cause a drop in internal gas pressure, potentially affecting insulation performance and operational stability. For equipment where power outage maintenance is not feasible, it is usually necessary to replenish gas while the equipment is energized to maintain normal operation. Therefore, configuring automatic gas replenishment devices has become a common practice to reduce the frequency of manual gas replenishment and ensure operational continuity.

[0025] However, existing automatic inflation devices still have some prominent problems in practical applications. Firstly, when the device is continuously connected to inflation port 1, the pin of the check valve inside inflation port 1 is easily subjected to continuous pressure. After prolonged stress, the check valve may rebound and fail, posing a risk of leakage after the device is disconnected. Secondly, when an automatic inflation device is first connected, the connecting pipeline usually needs to be flushed. Flushing refers to removing residual gas or impurities from the pipeline before formal inflation to avoid affecting the quality of the inflation. Insufficient flushing will also affect the stability and reliability of the inflation process.

[0026] Regarding the opening and closing of the inflation connector, existing technologies mainly employ two methods. One type uses an internal movable pin structure, where the pin moves back and forth within the connector to open or close the check valve inside inflation port 1. The other type uses a manually rotated nut-driven structure, where rotating the nut pushes the pin to open or close the connector. Regarding pipe cleaning, existing technologies typically employ vacuuming or directly introducing high-pressure SF6 gas to clean the pipeline, reducing the impact of residual media on the subsequent gas replenishment process.

[0027] However, the existing methods still struggle to balance structural reliability, operational stability, and pipe cleaning effectiveness. For internally movable pin structures, the numerous moving parts and relatively complex overall structure place higher demands on sealing performance. Manually rotated nut-driven structures are prone to problems such as difficulty in torque control, loose connections leading to leaks, and difficulty in precisely controlling the pin stroke. Pipe cleaning methods involving vacuuming and direct introduction of high-pressure SF6 gas have limited cleaning effectiveness in scenarios with bent pipes and may result in significant SF6 emissions; therefore, further improvements to existing technologies are still needed.

[0028] Based on the above, this application proposes an automatic inflation device connector and an automatic inflation device for SF6 electrical equipment. The following is a detailed description of this application in conjunction with the embodiments and accompanying drawings.

[0029] Example 1 This embodiment provides an automatic inflation device connector for SF6 electrical equipment, used to connect an inflation port 1 and an inflation tube 2. The automatic inflation device connector for SF6 electrical equipment includes an inflation connector 3, a housing 4, a linear drive mechanism 5, and a pin assembly 6. The linear drive mechanism 5 is located inside the housing 4, and a support member 7 is installed at the output end of the linear drive mechanism 5, with the support member 7 slidingly engaging with the interior of the housing 4. The inflation tube 2 is mounted on the support member 7 and is fitted inside the housing 4. The pin assembly 6 is installed at the front end of the inflation tube 2 and includes a pin and a sealing part, with the sealing part fitted over the pin. The inflation connector 3 is connected to the front end of the housing 4 and is used to connect to the inflation port 1.

[0030] Specifically, the inflation connector 3 preferably uses a nut that threads with the inflation port 1, so that the inflation interface can be fixed on the inflation port 1. The linear drive mechanism 5 and the inflation tube 2 are rigidly enclosed in a sealed housing 4. The outer part of the inflation tube 2 inside the housing 4 is preferably a rigid tube, and this rigid tube extends all the way to the outside of the housing 4, thereby ensuring that the housing 4 does not contact the flexible part of the inflation tube 2 during the expansion and contraction process, which is beneficial to the stable movement of the inflation tube 2. The expansion and contraction part of the linear drive mechanism 5 is provided with a support member 7. One part of the support member 7 is connected to the inflation tube 2, and the other part is slidably connected to the slide rail or groove inside the housing 4, thereby ensuring that the inflation tube 2 only moves axially when the linear drive mechanism 5 is activated, without producing significant radial sway.

[0031] Furthermore, the ejector pin assembly 6 is located at the front end of the inflation tube 2. The ejector pin in the ejector pin assembly 6 is separately disposed from the inflation connector 3. As an example, the front end of the ejector pin can adopt a frustum-shaped design, with a sealing part or sealing sleeve on its exterior. Thus, after the inflation connector 3 is fixed to the inflation port 1, the ejector pin is not forced to move prematurely due to the fixing process of the inflation connector 3. Instead, the entire inflation tube 2 is driven forward or backward by the linear drive mechanism 5, thereby achieving controlled action on the check valve ejector pin inside the inflation port 1. Preferably, the frustum-shaped structure at the front end of the ejector pin forms a sealing fit with its outer frustum portion, so that sealing can be achieved by relying on the frustum structure on the outside of the ejector pin during inflation, without the need to set a special sealing structure for the housing 4 itself.

[0032] In this embodiment, when inflation is required, the linear drive mechanism 5 drives the inflation tube 2 to move forward axially, causing the pin assembly 6 at the front end of the inflation tube 2 to press against the inflation interface, opening the pin of the check valve inside the inflation port 1, thereby connecting the inflation tube 2 with the SF6 electrical equipment compartment and initiating inflation. After inflation is completed, the linear drive mechanism 5 reverses its movement, driving the inflation tube 2 to retract axially, causing the pin assembly 6 to disengage from the inflation interface and releasing the pin of the check valve inside the inflation port 1. The check valve inside the inflation port 1 returns to its closed state, thereby disconnecting the inflation tube 2 from the SF6 electrical equipment compartment. Since this embodiment drives the entire inflation tube 2, rather than just the pin at the inflation connector, the original inflation tube 2 interface specifications can be directly adopted, eliminating the need for a complex pin movement structure and its matching sealing structure.

[0033] Example 2 like Figure 1 The diagram shown is a schematic of the connector for the automatic inflation device of SF6 electrical equipment in this embodiment. Figure 2 The diagram shown is a schematic of the automatic inflation device in this embodiment.

[0034] This application discloses an automatic inflation device, including an inflation port 1 and an inflation pipe 2, and also includes the aforementioned SF6 electrical equipment automatic inflation device connector, which is connected between the inflation port 1 and the inflation pipe 2. The SF6 electrical equipment automatic inflation device connector includes an inflation connector 3, a housing 4, a linear drive mechanism 5, a support 7, a ejector pin assembly 6, and a flexible ejector pin adapter assembly. The linear drive mechanism 5 is located inside the housing 4 and adopts an electric push rod. The output end of the electric push rod is equipped with a support member 7. The support member 7 is a plate-shaped structure. The bottom of the support member 7 slides with the inner wall of the housing 4 or the slide rail and groove inside the housing 4. The top is arc-shaped and adapts to the outer wall of the inflation tube 2, forming a rigid connection with the inflation tube 2. The inflation tube 2 is installed on the support member 7 and fitted inside the housing 4. The outer part of the inflation tube 2 inside the housing 4 is preferably a rigid tube and extends all the way to the outside of the housing 4. The ejector pin assembly 6 is installed at the front end of the inflation tube 2. The ejector pin assembly 6 includes an ejector pin and a sealing part. The front end of the ejector pin is frustoconical, and the sealing part is fitted outside the front end of the ejector pin. The inflation connector 3 adopts a nut part and is connected to the front end of the housing 4 for connection with the inflation port 1.

[0035] Example 3 like Figure 3The diagram shown is a schematic of the flexible ejector pin adapter assembly in this embodiment. This embodiment also includes a flexible ejector pin adapter assembly connected between the inflation port 1 and the housing 4. The flexible ejector pin adapter assembly includes an outer tube 8, a constraint tube 9, and a flexible ejector pin 10; the outer tube 8 is sleeved outside the constraint tube 9, and the flexible ejector pin 10 is installed inside the constraint tube 9; the outer tube 8, constraint tube 9, and flexible ejector pin 10 are coaxially arranged; an inflation connector 3 is installed at the front end of the outer tube 8, and the rear end of the outer tube 8 is connected to the housing 4; the front end of the flexible ejector pin 10 interacts with the inflation port 1, and the rear end of the flexible ejector pin 10 is connected to the ejector pin. Further, the flexible ejector pin 10 is installed inside the constraint tube 9 via a constraint tube support 11, which includes multiple support columns evenly distributed along the circumference of the constraint tube 9. Further, this embodiment also includes an adapter inflation port 12 connected between the outer tube 8 and the front end of the housing 4.

[0036] In this embodiment, the flexible ejector pin adapter assembly can be used to solve the problems of the long structure of the inflation port 1, the need to reserve space for manual operation, and the difficulty in directly installing the inflation connector in a confined space. One end of the flexible ejector pin adapter assembly is sealed to the inflation port 1, and the other end is connected to the inflation connector, and its interface form can be consistent with that of the inflation port 1; the constraint tube support 11 forms a rigid connection between the constraint tube 9 and the outer tube 8 and ensures that the two are concentric, the flexible ejector pin 10 can move inside the constraint tube 9, and the gas flows through the space between the outer tube 8 and the constraint tube 9. When the ejector pin at the front end of the inflation connector is pushed out, it pushes the flexible ejector pin 10 forward, and the flexible ejector pin 10 pushes open the check valve ejector pin in the inflation port 1. Preferably, the nut of the inflation connector can adopt a swivel structure to adjust the direction of the other end of the elbow; and, other angle or multi-angle adapters can also be made using the same principle to adapt to the installation and use requirements in special spaces. The flexible ejector pin adapter assembly has a simple structure, and its sealing method is the same as that of the traditional inflation interface, without the need to modify other devices.

[0037] Furthermore, in the automatic inflation device of this embodiment, a cleaning solenoid valve 13, a densitometer 14, and a check valve 15 can be installed on the portion of the inflation pipe 2 extending to the outside of the housing 4. In one embodiment, the cleaning solenoid valve 13, densitometer 14, and check valve 15 can be sequentially installed from front to back along the rear end of the inflation pipe 2. Thus, before inflation begins, the cleaning solenoid valve 13 can be used to perform pipe cleaning; during inflation, the densitometer 14 can be used to monitor the chamber density; and the check valve 15 can be used to improve the reliability of pipeline control. In addition to the above components, other accessories such as exhaust gas extraction or vacuum ports can be added according to actual conditions, and the installation positions of each accessory can differ from those shown in the figure.

[0038] It should be noted that the densitometer 14 can be used for cabin density monitoring. When the densitometer 14 is positioned between the check valve 15 and the cleaning solenoid valve 13, the cleaning solenoid valve 13 can be opened after each connection to perform density measurement. However, it is preferable to ensure that the pressure in the inflation end gas path is lower than the cabin pressure, and it is not necessary to clean the densitometer 14 pipeline each time. When the densitometer 14 is positioned further forward, it can be isolated from the rear gas path through the cleaning solenoid valve 13 during each measurement, so that the rear gas pressure does not affect the measurement. However, in this case, it is preferable to clean the densitometer 14 pipeline.

[0039] In the operation of this embodiment, the connector is first fixedly installed at the inflation port 1 using the inflation connector 3. When a flexible ejector pin adapter is used, the inflation connector 3 at the front end of the outer tube 8 is connected to the inflation port 1, the rear end of the outer tube 8 is connected to the housing 4, and the flexible ejector pin 10 is set inside the constraint tube 9 and connected to the ejector pin on the side of the housing 4. When the automatic inflation device is first connected, the tube cleaning operation can be performed by the cleaning solenoid valve 13. Since the inflation tube 2 is relatively long and the internal pipeline of the automatic inflation device has many bends, it is necessary to clean the air and moisture in the pipeline by tube cleaning. The tube cleaning method can be vacuum cleaning or high-pressure SF6 gas flushing. When using high-pressure SF6 gas flushing, the cleaning effect and efficiency can be improved by regularly switching the high-pressure gas, for example, by controlling it to open for 0.3 seconds, close for 5 seconds, and repeating this process multiple times. For this purpose, corresponding switching rules can be set in the automatic inflation device, or a control strategy list library can be formed, so that the user can automatically call the corresponding tube cleaning control strategy according to parameters such as the length of the inflation tube 2. It should also be noted that after the automatic inflation device is deployed on-site, the pipeline is already filled with SF6 gas, eliminating the need for pipe flushing during each inflation cycle. After each inflation cycle, solenoid valve 13 will close, sealing the pipeline from solenoid valve 13 to the automatic inflation device, preventing air or other impurities from entering. The next inflation cycle only requires flushing the pipeline from solenoid valve 13 to the ejector pin.

[0040] After the pipe cleaning operation is completed, the cleaning solenoid valve 13 is closed to prevent impurities in the air from causing secondary pollution to the pipeline. At this time, usually only a small section of straight pipe at the push rod may be contaminated by impurities; since this section of pipe is short and straight, and the cleaning process of this section of pipe and the connection with electrical equipment are controlled by the air filling device, the amount of SF6 gas discharged into the air is negligible. Compared with the traditional method of cleaning the external pipeline every time air is filled, it can be considered to achieve a near-zero emission effect.

[0041] Subsequently, the electric push rod actuates, pushing the support 7 and the inflation pipe 2 forward. This causes the pin assembly 6 at the front end of the inflation pipe 2 to directly or via the flexible pin 10 push the check valve pin in the inflation port 1, thereby opening the check valve in the inflation port 1. The inflation pipe 2 then connects to the SF6 electrical equipment compartment and begins inflation. After inflation is complete, the electric push rod reverses, causing the inflation pipe 2 to retract. The pin assembly 6 exits its operating position, and the check valve in the inflation port 1 returns to its closed state under its own structural action, completing the disconnection process. Before disconnecting the inflation process, the cleaning solenoid valve 13 can be closed to ensure that the inflation pipe 2 is not contaminated again, avoiding unnecessary pipe cleaning before the next inflation start. Through the above structure, this embodiment not only achieves automatic control of the opening and closing of the check valve in the inflation port 1, but also reduces the frequency of manual on-site operation and reduces the risk of seal failure caused by the inflation port 1 being in an open state for a long time.

[0042] Additionally, it should be noted that in some other embodiments of this application, the nut used in the inflation connector 3 can be a multi-diameter adaptive nut, or it can adopt a structure with a quick-change nut to achieve compatibility with inflation interfaces from different manufacturers. Furthermore, the surface of the frustum-shaped structure at the front end of the ejector pin can be covered with sealing material, and the frustum-shaped structure can be connected to its rear ejector rod by screws, thereby allowing the ejector pin to be replaced as needed to adapt to the check valve structure inside the inflation port 1 from different manufacturers.

[0043] In other embodiments of this application, the linear motion of the push rod to open the check valve 15 does not significantly affect the components secured by the rotating threads in the entire connector. Simultaneously, the push rod's movement speed is faster than manual rotation, and the transition from the closed state to the fully open state of the check valve 15 is shorter, resulting in virtually no noticeable air leakage. Furthermore, the push rod's stroke accuracy is controllable. The thrust can be detected and controlled by measuring the push rod's drive current, push rod pressure, or by adding an elastic element to the ejector pin, to prevent the ejector pin from being opened insufficiently or excessively. Further, a corresponding set value or manufacturer model table can be set within the automatic inflation device, or the inflation port 1 model can be identified via NFC, tags, etc., and the degree of opening can be reflected based on set pressure, current, and other parameters, thereby adapting to different manufacturers' inflation interface specifications.

[0044] In some other embodiments of this application, the housing 4 and the tail of the inflation tube 2 can be slidably connected and sealed. With this structure, in addition to protecting the electric push rod from dust and water, the housing 4 can also read the pressure changes inside the housing 4 after the inflation connection is disconnected, in conjunction with other control methods, to determine whether the ejector pin is fully closed.

[0045] The working principle of this device is as follows: A linear drive mechanism 5, located within the housing 4, drives the inflation tube 2 to reciprocate axially. The pin assembly 6 at the front end of the inflation tube 2 directly or indirectly acts on the check valve pin in the inflation port 1, thereby achieving a controlled opening and closing process where the check valve in the inflation port 1 opens only during inflation and closes after inflation stops. Since this application does not continuously keep the check valve in the inflation port 1 in a working state by connecting the inflation tube 2, but only opens the check valve in the inflation port 1 during actual inflation via a push rod, and then retracts to release it after inflation, the continuous working time of the spring in the check valve in the inflation port 1 can be reduced, which is beneficial for improving the service life of the inflation port 1 and ensuring its sealing performance. Specifically: During the device installation phase, the connector is first fixedly connected to the inflation port 1 using the inflation connector 3. When space is limited on site, a flexible ejector pin adapter assembly can be installed between the inflation port 1 and the housing 4. The adapter channel is formed by the outer tube 8, the constraint tube 9, and the flexible ejector pin 10. Gas flows through the space between the outer tube 8 and the constraint tube 9, while the flexible ejector pin 10 moves within the constraint tube 9 and transmits the opening action. During the inflation preparation phase, the inflation pipe 2 can be flushed using the cleaning solenoid valve 13 to remove air, moisture, and other impurities from the pipe. After flushing, the cleaning solenoid valve 13 is closed to reduce the risk of external impurities re-entering the pipe.

[0046] When inflation begins, the electric push rod outputs linear motion, driving the support member 7 and the inflation pipe 2 connected to it forward. Because the support member 7 has a sliding fit with the inner wall of the housing 4, the slide rail or groove inside the housing 4, and a rigid connection with the inflation pipe 2, the inflation pipe 2 moves primarily axially during its forward movement, making significant swaying unlikely. When the ejector pin assembly 6 at the front end of the inflation pipe 2 moves to the inflation port 1, the ejector pin can directly open the check valve ejector pin inside the inflation port 1, or first push the flexible ejector pin 10, which then opens the check valve ejector pin inside the inflation port 1, thereby opening the check valve inside the inflation port 1 and forming an inflation passage from the inflation pipe 2 to the SF6 electrical equipment compartment. Inflation can then be performed, and corresponding tests can be conducted using the density meter 14 as needed.

[0047] When inflation ends, the electric push rod reverses its movement, causing the inflation tube 2 to retract axially. The ejector pin assembly 6 withdraws from its position relative to the inflation port 1. The check valve ejector pin inside the inflation port 1 returns to its closed state after losing external force, thus disconnecting the inflation tube 2 from the SF6 electrical equipment compartment. Compared to manually adjusting the ejector pin stroke by rotation, this application uses a push rod to drive the entire inflation tube 2 back and forth, reducing the risk of leakage in the intermediate state and avoiding problems such as excessive torque, loosening and leakage, and difficulty in precise stroke control that may occur with the double-nut structure. This achieves automatic control of the opening and closing of the check valve ejector pin inside the inflation port 1.

[0048] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A connector for an automatic inflation device for SF6 electrical equipment, used to connect an inflation port (1) and an inflation pipe (2); characterized in that, It includes an inflation connector (3), a housing (4), a linear drive mechanism (5), and a pin assembly (6); The linear drive mechanism (5) is located inside the housing (4), and a support member (7) is installed at the output end of the linear drive mechanism (5). The support member (7) slides in cooperation with the inside of the housing (4). The inflation tube (2) is installed on the support (7) and is fitted inside the housing (4); The ejector pin assembly (6) is installed at the front end of the air tube (2). The ejector pin assembly (6) includes an ejector pin and a sealing part, and the sealing part is sleeved on the outside of the ejector pin. The inflation connector (3) is connected to the front end of the housing (4) and is used to connect to the inflation port (1).

2. The SF6 electrical equipment automatic inflation device connector according to claim 1, characterized in that, The front end of the ejector pin is truncated cone-shaped, and the sealing part is sleeved on the outside of the front end of the ejector pin.

3. The SF6 electrical equipment automatic inflation device connector according to claim 1, characterized in that, The linear drive mechanism (5) uses an electric push rod.

4. The SF6 electrical equipment automatic inflation device connector according to claim 1, characterized in that, The inflatable connector (3) is a nut.

5. The SF6 electrical equipment automatic inflation device connector according to claim 1, characterized in that, The support member (7) is a plate-shaped structure. The bottom of the support member (7) slides with the inner wall of the shell (4), and the top is arc-shaped and adapted to the outer wall of the inflation tube (2).

6. The SF6 electrical equipment automatic inflation device connector according to claim 1, characterized in that, It also includes a flexible ejector pin adapter assembly connecting the air inlet (1) and the housing (4); the flexible ejector pin adapter assembly includes an outer tube (8), a constraint tube (9) and a flexible ejector pin (10); The outer tube (8) is sleeved on the outside of the constraint tube (9), and the flexible pin (10) is installed inside the constraint tube (9). The outer tube (8), the constraint tube (9) and the flexible pin (10) are coaxially arranged. The inflation connector (3) is installed at the front end of the outer tube (8), and the rear end of the outer tube (8) is connected to the shell (4); The front end of the flexible ejector pin (10) is used to interact with the air inlet (1), and the rear end of the flexible ejector pin (10) is connected to the ejector pin.

7. The SF6 electrical equipment automatic inflation device connector according to claim 6, characterized in that, The flexible ejector pin (10) is installed inside the constraint tube (9) through the constraint tube bracket (11); The constraint tube support (11) includes multiple support columns evenly distributed along the circumference of the constraint tube (9).

8. The SF6 electrical equipment automatic inflation device connector according to claim 7, characterized in that, It also includes an adapter for an air inlet (12); The adapter inflation port (12) is connected between the outer tube (8) and the front end of the shell (4).

9. An automatic inflation device, comprising an inflation port (1) and an inflation tube (2); characterized in that, It also includes an SF6 electrical equipment automatic inflation device connector as described in any one of claims 1 to 8; The SF6 electrical equipment automatic inflation device connector is connected between the inflation port (1) and the inflation pipe (2).

10. An automatic inflation device according to claim 9, characterized in that: The part of the inflation tube (2) extending to the outside of the housing (4) is provided with a cleaning solenoid valve (13), a densitometer (14) and a check valve (15) in sequence from front to back at the rear end of the inflation tube (2).

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