A lubricating device for a double-acting transmission arc-extinguishing chamber and the arc-extinguishing chamber

Abstract

The application belongs to the technical field of high-voltage circuit breakers and relates to a lubricating device for a double-acting transmission arc-extinguishing chamber and the arc-extinguishing chamber. The application directly drives the rotation of an oil pump by the movement of a static arc contact, so that the lubricating action is kept synchronous with the movement of the static arc contact; the more frequent the transmission is, the more sufficient the lubrication is, and the problem of dry friction of key components caused by local and intermittent lubrication in the prior art is solved. The wedge-shaped fan blades on the oil pump splash lubricating oil to the surfaces of all moving components such as push-pull rods, double-acting transmission devices and racks during the rotation process, so that a continuous, stable and uniform lubricating oil film is formed, and mechanical wear is reduced. The magnetic oil plug arranged at the bottom of the oil pool can effectively adsorb metal wear particles carried in the lubricating oil circulation process, prevent the accumulation of the metal wear particles in the system to cause secondary wear, avoid the entry of the metal wear particles into the main insulation area of the arc-extinguishing chamber, eliminate the local electric field distortion and breakdown risk caused by the suspension of the metal wear particles, and significantly improve the insulation reliability of the circuit breaker.

Description

Technical Field

[0001] This invention belongs to the technical field of high-voltage circuit breakers, and relates to a lubrication device and an arc-extinguishing chamber for a double-acting transmission arc-extinguishing chamber. Background Technology

[0002] High-voltage circuit breakers are crucial protective devices in power systems, their core function being to quickly and reliably disconnect circuits in the event of a fault. With the continuous expansion of power grids and the constant increase in short-circuit current levels, higher demands are placed on the breaking capacity of circuit breakers, especially high-capacity circuit breakers. For example, double-acting arc-extinguishing chamber technology is widely used in GIS (Gas Insulated Switchgear) systems with voltage levels of 363kV and above. This technology achieves higher relative speeds by reversing the movement of the moving and stationary contacts, thereby meeting the requirements for high-capacity breaking capacity.

[0003] In a double-acting arc-extinguishing chamber, the double-acting transmission structure that enables the contacts to move in opposite directions comprises multiple cooperating active and passive components. During long-term, high-frequency opening and closing operations, mechanical wear inevitably occurs between these transmission components. If metal particles worn off and become suspended inside the arc-extinguishing chamber, they can cause localized electric field distortion under high voltage, significantly increasing the risk of discharge. In severe cases, this can even lead to arc-extinguishing chamber breakdown, directly threatening the operational reliability of the circuit breaker and the safety of the power system.

[0004] To mitigate the aforementioned wear problems, existing technologies typically employ localized lubrication, applying lubricating grease to certain critical points in the transmission structure. However, analysis reveals the following inherent drawbacks in this existing technological approach: First, lubrication coverage is incomplete and intermittent. Localized lubrication cannot form an effective and continuous oil film covering all relatively moving contact surfaces in a dual-action transmission structure, resulting in some key transmission components being in a state of dry friction or boundary friction for extended periods, and the wear problem is not fundamentally improved. Simultaneously, existing lubrication methods are passive and intermittent. When the transmission mechanism operates at high speed during opening and closing actions, lubricating grease is difficult to replenish in a timely and even manner to the rapidly changing friction surfaces, causing unstable lubrication effects and affecting the dynamic response and long-term lifespan of the transmission mechanism.

[0005] Secondly, existing technologies completely lack the function of removing or adsorbing metal particles generated during the wear process. These particles can mix into the lubricating grease or deposit on the surface of transmission components, which not only accelerates the deterioration of the lubricating grease and reduces its lubrication efficiency, but their own hard particle characteristics can also cause secondary wear on the mating surfaces, forming a vicious cycle of "wear-particles-aggravated wear", further accelerating the failure process of the transmission system. Summary of the Invention

[0006] The purpose of this invention is to provide a lubrication device and an arc-extinguishing chamber for a double-acting transmission arc-extinguishing chamber, so as to solve the technical problem that in the existing double-acting arc-extinguishing chamber, the transmission components are subject to uneven lubrication, loss of lubricating grease and lack of wear particle removal mechanism, resulting in severe wear of key transmission parts, and the falling metal particles cause local electric field distortion, resulting in discharge or even breakdown risk.

[0007] To achieve the above objectives, the present invention employs the following technical solution: In a first aspect, the present invention provides a lubrication device for a double-acting arc-extinguishing chamber, comprising: The oil sump seat has an internal space for containing lubricating oil, and the oil sump seat has a push-pull rod assembly hole and a static arc contact assembly hole. The push-pull rod is movably inserted into the push-pull rod mounting hole; A double-acting transmission device is arranged inside the oil sump seat and is connected to the push-pull rod for transmission. A stationary arc contact is movably inserted into the stationary arc contact assembly hole and is connected to the push-pull rod for transmission. The double-action transmission device is used to transmit the reciprocating motion of the push-pull rod to the stationary arc contact. A rack is provided on the static arc contact; A drive shaft gear is rotatably connected to the oil sump seat and located inside the oil sump seat; the drive shaft gear meshes with the rack. Two oil pumps are mounted on the transmission shaft gear, and the rack is located between the two oil pumps. Each oil pump has several blades. A magnetic oil plug is located at the bottom of the oil tank.

[0008] Furthermore, the oil tank base includes an oil tank shell and an oil tank cover, the oil tank shell and the oil tank cover are detachably fixedly connected, the double-acting transmission device is located between the oil tank shell and the oil tank cover, the transmission shaft gear is rotatably connected to the oil tank shell, and the oil tank shell is provided with a push-pull rod assembly hole and a static arc contact assembly hole.

[0009] Furthermore, an upper oil seal is provided in the mounting hole of the push-pull rod, and the upper oil seal is located between the oil sump seat and the push-pull rod; A lower oil seal is provided in the mounting hole of the static arc contact, and the lower oil seal is located between the oil sump seat and the static arc contact.

[0010] Furthermore, it also includes a crossbeam, which is fixed on the oil tank seat, and the push-pull rod and the static arc contact both pass through the crossbeam.

[0011] Furthermore, the push-pull rod is arranged parallel to the static arc contact, the rack is coaxial with the static arc contact, the rack and the transmission shaft gear are both located below the double-action transmission device, and the rack is located on the side of the transmission shaft gear closer to the double-action transmission device.

[0012] Furthermore, the transmission shaft gear includes a gear portion and stepped shafts located on both sides of the gear portion, the gear portion meshing with the rack, and the oil pump being sleeved on the stepped shaft; Several fan blades are evenly arranged around the oil pump, and the cross-section of the fan blades is trapezoidal.

[0013] Furthermore, the oil tank seat is provided with an upper oil plug, which is located at the top of the oil tank seat.

[0014] Furthermore, the magnetic oil plug includes a lower oil plug and a magnet, the lower oil plug being embedded in the oil sump seat, and the lower oil plug and the magnet being fixedly connected.

[0015] Secondly, the present invention provides a double-acting transmission arc-extinguishing chamber, employing a lubrication device for the double-acting transmission arc-extinguishing chamber, comprising: a cylinder, a piston, a moving main contact, a large nozzle, a stationary main contact, a guide shield, a small nozzle, and a pull rod arranged coaxially; The stationary main contact is fixedly connected to the crossbeam, and the crossbeam is located between the stationary main contact and the oil sump seat; The pull rod passes through the cylinder and is fixedly connected to the piston. One end of the moving main contact is movably embedded in the cylinder. When the circuit is closed, the other end of the moving main contact is movably embedded in the stationary main contact. The piston is located inside the cylinder and is fixedly connected to the moving main contact. The large nozzle and the guide shield are located inside the stationary main contact, and the large nozzle is fixedly connected to the moving main contact. The large nozzle is connected to the push-pull rod through the guide shield. The small nozzle is fixedly connected to the piston and embedded in the large nozzle. A moving arc contact is coaxially arranged in the small nozzle. When the circuit is closed, the stationary arc contact is embedded in the moving arc contact.

[0016] Furthermore, the piston is equipped with a one-way valve plate.

[0017] Compared with the prior art, the present invention has the following beneficial effects: This invention directly drives the oil pump rotation through the movement of the stationary arc contact, ensuring synchronization between the lubrication action and the stationary arc contact movement. More frequent transmission results in more thorough lubrication, solving the problem of dry friction in key components caused by localized, intermittent lubrication in existing technologies. During rotation, the wedge-shaped fan blades on the oil pump splash lubricating oil onto the surfaces of all moving parts, including the push-pull rod, double-action transmission device, and rack, forming a continuous, stable, and uniform lubricating oil film, significantly reducing mechanical wear. The magnetic oil plug at the bottom of the oil sump effectively adsorbs metal wear particles carried during lubricating oil circulation, preventing particle accumulation and secondary wear. It also fundamentally prevents metal particles from entering the main insulation area of ​​the arc-extinguishing chamber, eliminating the risk of localized electric field distortion and breakdown caused by suspended particles, significantly improving the insulation reliability of the circuit breaker.

[0018] In this invention, the oil tank seat and the moving parts are sealed by an oil seal, and the overall lubrication structure is independent of the arc-extinguishing chamber, ensuring that the lubricating oil will not leak into the arc-extinguishing chamber and will not affect the insulation performance and breaking capacity of the arc-extinguishing chamber at all.

[0019] In the double-acting transmission arc-extinguishing chamber of this invention, the double-acting structure enables the moving and stationary contacts to achieve higher relative speeds, meeting the requirements for high-capacity interruption. Simultaneously, the integrated lubrication device significantly reduces wear on the transmission system, extending the service life of the arc-extinguishing chamber. The lubrication device completely encloses lubricating oil and wear particles within the oil sump, preventing metal particles from entering the main insulation area of ​​the arc-extinguishing chamber and eliminating the risk of localized electric field distortion and breakdown caused by suspended particles. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the arc-extinguishing chamber with lubrication device of the present invention; Figure 2 for Figure 1 AA section view; Figure 3 This is a schematic diagram of the lubrication unit structure of the present invention; Figure 4 This is a front view of the lubrication unit of the present invention; Figure 5 for Figure 4 BB section view; Figure 6 This is a schematic diagram of the transmission shaft gear structure of the present invention; Figure 7 This is a schematic diagram of the oil pump structure of the present invention; Figure 8 This is a front view of the oil pump structure of the present invention; Figure 9 This is a schematic diagram of the lower oil plug structure of the present invention; Figure 10 This is a cross-sectional view of the lower oil plug of the present invention.

[0021] The components are as follows: 1. Cylinder; 2. Piston; 3. Moving main contact; 4. Large nozzle; 5. Stationary main contact; 6. Upper oil seal; 7. Push-pull rod; 8. Upper oil plug; 9. Oil sump housing; 10. Double-acting transmission device; 11. Oil sump cover; 12. Magnetic oil plug; 13. Lubrication unit; 14. Stationary arc contact; 15. Lower oil seal; 16. Crossbeam; 17. Guide shield; 18. Small nozzle; 19. Moving arc contact; 20. One-way valve plate; 21. Pull rod; 13A. Drive shaft gear; 13B. Oil pump; 12A. Lower oil plug; 12B. Magnet; 22. Rack; 23. Oil sump seat; 24. Fan blade; 25. Lubricating oil; 26. Lubricating oil level; 27. Gear section; 28. Stepped shaft. Detailed Implementation

[0022] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0023] It should be noted that the terms "first," "second," etc., in the specification and accompanying 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 the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover 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.

[0024] Example 1: The present invention will now be described in further detail with reference to the accompanying drawings: See Figure 1 The present invention discloses a lubrication device for a double-acting transmission arc-extinguishing chamber, comprising: an oil sump seat 23, an upper oil seal 6, a push-pull rod 7, a double-acting transmission device 10, a static arc contact 14, a rack 22, a transmission shaft gear 13A, two oil pumps 13B, a magnetic oil plug 12, and a lower oil seal 15.

[0025] The oil sump seat 23 has an internal space for accommodating lubricating oil, providing an independent and enclosed storage space for the lubricating oil. The oil sump seat 23 also has mounting holes for push-pull rods and static arc contacts, providing precise motion guidance and installation positioning for the push-pull rods and static arc contacts.

[0026] The push-pull rod 7 is movably inserted into the push-pull rod assembly hole. As an active power input component, the push-pull rod 7 transmits the power of the external operating mechanism to the inside of the oil sump seat, driving the double-action transmission device to work.

[0027] See Figure 1 and Figure 2 The double-action transmission device 10 is arranged inside the oil sump seat 23 and is connected to the push-pull rod 7. The double-action transmission device 10 realizes the motion conversion function, converting the unidirectional motion of the push-pull rod into the reverse motion of the stationary arc contact, thereby meeting the requirements of the double-action arc extinguishing chamber for the relative speed of the moving and stationary contacts.

[0028] The stationary arc contact 14 is movably inserted into the stationary arc contact assembly hole and is connected to the push-pull rod 7. The double-action transmission device 10 is used to transmit the reciprocating motion of the push-pull rod 7 to the stationary arc contact 14. Driven by the push-pull rod 7, the stationary arc contact 14 moves in the opposite direction to the active side, thus forming a double-action structure and improving the opening and closing speed.

[0029] The rack 22 is disposed on the static arc contact 14.

[0030] See Figures 3 to 5 This is a schematic diagram of the lubrication unit structure. The drive shaft gear 13A is rotatably connected to the oil sump seat 23 and is located inside the oil sump seat 23. The drive shaft gear 13A meshes with the rack 22. The rack 22 cooperates with the drive shaft gear 13A to convert the linear motion of the rack 22 into the rotational motion of the drive shaft gear 13A, and also serves as the mounting carrier and drive shaft of the oil pump 13B.

[0031] Two oil pumps 13B are mounted on the transmission shaft gear 13A, and the rack 22 is located between the two oil pumps 13B. Each oil pump 13B has several fan blades 24. This achieves symmetrical splash lubrication on both sides, ensuring that the oil pumps on both sides can work simultaneously regardless of whether the transmission shaft gear rotates forward or backward, guaranteeing lubrication without dead angles throughout the entire opening and closing process.

[0032] A magnetic oil plug 12 is located at the bottom of the oil sump seat 23. When the lubricating oil flows back to the bottom of the oil sump by gravity, it adsorbs and fixes the metal wear particles carried during the circulation process, preventing the particles from accumulating in the system and causing secondary wear, while also preventing the particles from entering the arc-extinguishing chamber and causing discharge or breakdown.

[0033] In a preferred embodiment of the present invention, the oil sump base 23 includes an oil sump housing 9 and an oil sump cover 11, which are detachably and fixedly connected. The double-acting transmission device 10 is disposed between the oil sump housing 9 and the oil sump cover 11. The transmission shaft gear 13A is rotatably connected to the oil sump housing 9. The oil sump housing 9 has a push-pull rod assembly hole and a static arc contact assembly hole. The detachable and fixed connection design of the oil sump housing 9 and the oil sump cover 11 facilitates the manufacturing of parts and also facilitates the assembly, inspection, and maintenance of the internal transmission device and lubrication device.

[0034] In a preferred embodiment of the present invention, an upper oil seal 6 is provided in the mounting hole of the push-pull rod, and the upper oil seal 6 is located between the oil sump seat 23 and the push-pull rod 7; a lower oil seal 15 is provided in the mounting hole of the stationary arc contact, and the lower oil seal 15 is located between the oil sump seat 23 and the stationary arc contact 14. This ensures smooth reciprocating movement of the push-pull rod and the stationary arc contact while achieving dynamic sealing, preventing lubricating oil from leaking from the clearance between the moving parts to the outside of the oil sump seat.

[0035] In a preferred embodiment of the present invention, a crossbeam 16 is further included, which is fixed on the oil tank seat 23, and the push-pull rod 7 and the static arc contact 14 both pass through the crossbeam 16.

[0036] In a preferred embodiment of the present invention, the push-pull rod 7 is arranged parallel to the static arc contact 14, the rack 22 is coaxial with the static arc contact 14, and both the rack 22 and the transmission shaft gear 13A are located below the double-action transmission device 10, with the rack 22 located on the side of the transmission shaft gear 13A closer to the double-action transmission device 10. This design helps to ensure a compact structure, improve space utilization, facilitate miniaturization, ensure accurate meshing of the rack and gear, and provide sufficient space for splash lubrication of the oil pump fan blades.

[0037] See Figure 6 In a preferred embodiment of the present invention, the transmission shaft gear 13A includes a gear portion 27 and stepped shafts 28 located on both sides of the gear portion. The gear portion 27 meshes with the rack 22, and the oil pump 13B is sleeved on the stepped shafts 28. See also Figure 7 and Figure 8 Several fan blades 24 are evenly arranged around the oil pump 13B. The cross-section of the fan blades 24 is trapezoidal, which helps to increase the contact area between the fan blades and the lubricating oil and the stirring efficiency. The trapezoidal cross-section helps to generate a greater splashing force when rotating, so that the lubricating oil can cover the surface of the transmission components further away.

[0038] In a preferred embodiment of the present invention, an upper oil plug 8 is provided on the oil sump seat 23, and the upper oil plug 8 is located at the top of the oil sump seat 23. After the upper oil plug 8 is opened, it provides an oil injection channel, which facilitates the addition or replenishment of lubricating oil without disassembling the oil sump seat, and at the same time has a sealing function to prevent lubricating oil from overflowing from the top.

[0039] See Figures 9 to 10 In a preferred embodiment of the present invention, the magnetic oil plug 12 includes a lower oil plug 12A and a magnet 12B. The lower oil plug 12A is embedded in the oil sump seat 23, and the lower oil plug 12A and the magnet 12B are fixedly connected. The magnetic oil plug 12 integrates the dual functions of oil drainage and adsorption. It can drain old oil and replace lubricating oil by removing the lower oil plug, and it can also stably adsorb metal particles through the fixed magnet, which is convenient for maintenance and cleaning.

[0040] See Figure 1 Based on the above-mentioned lubrication device, the present invention also discloses a double-acting transmission arc-extinguishing chamber, comprising: a cylinder 1, a piston 2, a moving main contact 3, a large nozzle 4, a stationary main contact 5, a guide shield 17, a small nozzle 18, and a pull rod 21 arranged coaxially, to ensure the coaxiality of the movement of each component inside the arc-extinguishing chamber, reduce radial runout during the opening and closing process, and improve transmission efficiency and arc-extinguishing reliability.

[0041] The stationary main contact 5 is fixedly connected to the crossbeam 16, and the crossbeam 16 is located between the stationary main contact 5 and the oil tank seat 23.

[0042] The pull rod 21 passes through the cylinder 1 and is fixedly connected to the piston 2. One end of the moving main contact 3 is movably embedded in the cylinder 1, directly transmitting the power of the external operating mechanism to the piston, serving as the main power input end for the arc extinguishing chamber operation.

[0043] When the circuit is closed, the other end of the moving main contact 3 is movably embedded in the stationary main contact 5. When the circuit is opened, the moving main contact 3 slides out from the stationary main contact 5. The piston 2 is located inside the cylinder 1 and is fixedly connected to the moving main contact 3, ensuring that the piston and the moving main contact move synchronously. The large nozzle 4 and the guide shield 17 are located inside the stationary main contact 5, and the large nozzle 4 is fixedly connected to the moving main contact 3, ensuring that the large nozzle moves synchronously with the moving main contact. The large nozzle 4 is connected to the push-pull rod 7 through the guide shield 17. The movement of the moving main contact is transmitted to the push-pull rod through the guide shield, thereby driving the double-action transmission device in the oil sump seat, realizing the linkage between the movement of the moving main contact and the lubrication device.

[0044] The small nozzle 18 is fixedly connected to the piston 2 and embedded in the large nozzle 4. A moving arc contact 19 is coaxially arranged in the small nozzle 18. When the circuit is closed, the stationary arc contact 14 is embedded in the moving arc contact 19. When the circuit is opened, the stationary arc contact 14 slides out from the moving arc contact 19.

[0045] In a preferred embodiment of the present invention, the piston 2 is provided with a one-way valve plate 20. This controls the unidirectional flow of air during the opening and closing process, enhancing the air blowing effect within the arc-extinguishing chamber and improving the high-current breaking capacity.

[0046] The double-acting transmission arc-extinguishing chamber of this invention achieves high-speed reverse movement of the moving and stationary contacts, obtaining the relative speed required for large-capacity interruption of voltage levels of 363kV and above. At the same time, the nested structure of the large and small nozzles and the piston-cylinder air-blowing system work together to form a highly efficient air-blowing arc-extinguishing capability. In addition, the movement of the moving main contact is directly linked to the push-pull rod through the guide shield, providing synchronous driving force for the lubrication device in the oil sump seat, realizing the integrated operation of arc extinguishing and lubrication.

[0047] The arc-extinguishing chamber of this invention with a lubrication device integrates a splash lubrication system driven by the movement of the stationary arc contact while achieving a large-capacity interruption function.

[0048] The arc-extinguishing chamber adopts a double-action transmission structure. When opening, the push-pull rod 7 and the stationary arc contact 14 move in opposite directions, and when closing, they move in opposite directions, so that the moving and stationary contacts can obtain a high relative speed, which meets the high-capacity interruption requirements of voltage levels of 363kV and above.

[0049] Throughout the opening and closing process, the reciprocating motion of the stationary arc contact 14 drives the transmission shaft gear 13A to rotate via the rack 22 at its rear end. When opening, the rack moves to the left, driving the gear to rotate counterclockwise; when closing, the rack moves to the right, driving the gear to rotate clockwise. Regardless of whether opening or closing, although the rotation direction of the transmission shaft gear 13A is opposite, it drives the oil pumps 13B fixed on both sides to rotate synchronously. During rotation, the wedge-shaped fan blades on the oil pumps 13B splash the liquid lubricating oil stored in the oil sump 23 onto the surfaces of all transmission components, including the push-pull rod 7, the double-action transmission device 10, and the rack 22, forming a uniform and continuous lubricating oil film, effectively reducing mechanical wear.

[0050] After splashing, the lubricating oil flows back to the bottom of the oil sump under gravity, forming a closed-loop system of splashing-lubrication-recirculation-re-splashing. Metal particles generated by wear are suspended in the lubricating oil and, as they circulate to the bottom of the oil sump, are attracted and fixed by the magnet in the magnetic oil plug 12, thus being removed from the system. Simultaneously, the oil seal structure between the oil sump and the moving parts completely seals the lubricating oil within an independent space, preventing leakage into the main area of ​​the arc-extinguishing chamber and avoiding impact on insulation performance and arc-extinguishing capability.

[0051] In summary, this invention, while ensuring the high-capacity breaking performance of the double-acting arc-extinguishing chamber, directly drives the lubrication system through the movement of the stationary arc contact, achieving continuous and uniform lubrication throughout the opening and closing process, and simultaneously completing the adsorption and removal of wear particles, fundamentally solving the problem of discharge risk caused by wear of transmission components.

[0052] Example 2: See Figure 1 The arc-extinguishing chamber of this invention adopts a double-action transmission structure to achieve bidirectional movement on both the dynamic and static sides. Its interior is filled with insulating gas and has a transmission mechanism mounting interface, through which the double-action transmission structure is connected to the transmission mechanism.

[0053] Figure 1 The medium-duty transmission structure includes active parts, passive parts, and a dual-duty transmission device.

[0054] The active component includes a push-pull rod 7, which passes through the push-pull rod mounting hole on the upper side of the oil tank seat 23 and is sealed with the oil tank seat 23 by an oil seal. It is connected to the double-action transmission device 10 to provide active power for the movement.

[0055] The passive component includes a stationary arc contact 14, which has a transmission structure at its rear end and is connected to the double-acting transmission device 10. It is driven by the active component to achieve passive motion. The stationary arc contact 14 has a rack 22 at its rear end, which can provide power to the lubrication unit 13.

[0056] The main function of the double-acting transmission device 10 is motion conversion, which can convert the motion of the active part into the motion of the passive part, thereby realizing bidirectional motion of the moving and stationary sides when the arc extinguishing chamber is opened and closed.

[0057] Figure 1 In this design, the oil tank seat 23 is a split structure, comprising an oil tank shell 9 and an oil tank cover 11. This split structure facilitates parts manufacturing. One end of the oil tank seat 23 is fixed to the crossbeam 16, serving as a fixed component. The oil tank seat 23 has the following functions: Motion guiding function: The inner cavity of the oil tank seat 23 provides motion guidance for the push-pull rod 7, the static arc contact 14 and the double-acting transmission device 10, ensuring smooth movement of the transmission mechanism; Forced lubrication function: A lubrication unit 13 is installed inside the oil sump 23 to provide continuous lubrication for the transmission structure; see also Figures 3 to 5 This is a schematic diagram of the lubrication unit 13. Sealing function: An oil seal structure is provided at the connection between the oil sump seat 23 and the transmission parts to prevent lubricating oil leakage. The split mounting surface of the oil sump seat 23 has a sealing structure or sealing function to ensure reliable overall sealing of the oil sump seat 23. At the same time, the oil sump has an oil filling hole and an oil drain hole, and is equipped with an oil plug, which has a sealing function.

[0058] Figure 1 In the middle, the oil sump seat 23 is filled with an appropriate amount of liquid lubricating oil. The level of the lubricating oil does not exceed the height of the lower oil seal 15 and is not lower than the lowest functional position of splash lubrication of the fan blade 24.

[0059] Figure 1 In this process, the circulation path of the lubricating oil within the oil sump 23 is as follows: When the oil pump 13B rotates, the fan blade 24 splashes lubricating oil from the bottom of the oil sump 23 onto the surface of the double-acting transmission device 10; Lubricating oil forms a lubricating film on the surface of transmission parts, thus achieving lubrication; The lubricating oil flows back to the bottom of the oil sump 23 under the action of gravity; Oil pump 13B rotates again, splashing lubricating oil, and this cycle repeats. Metal particles generated by wear are suspended in the lubricating oil and eventually attracted by the magnet of the magnetic oil plug 12.

[0060] Figure 3 In the middle, the oil pump 13B is mirror-mounted on both sides of the transmission shaft gear 13A. The oil pump 13B is fixed together with the transmission shaft gear 13A and rotates synchronously with the transmission shaft gear 13A.

[0061] Figure 3 In the middle, the drive shaft gear 13A is mounted on the oil sump seat 23 and can rotate freely along the axis of the drive shaft gear 13A. The contact surface between the drive shaft gear 13A and the oil sump has a sealing structure or sealing function. The gear on the drive shaft gear 13A meshes with the rack 22 on the static arc contact 14. The rack 22 is located between the two oil pumps 13B.

[0062] The working principle of the lubrication device is as follows: When the driven component of the double-acting transmission drives the rack 22, the rack 22 drives the transmission shaft gear 13A to rotate. Since the oil pump 13B is fixed to the transmission shaft gear 13A, the oil pump 13B rotates accordingly. When the oil pump 13B rotates, the wedge-shaped fan blades 24 splash lubricating oil onto the surface of the double-acting transmission structure and its lubrication unit, achieving continuous lubrication of the transmission components. During opening, the transmission shaft gear 13A rotates counterclockwise, and the oil pump 13B splashes lubricating oil onto the surface of the transmission structure; during closing, the transmission shaft gear 13A rotates clockwise, and the oil pump 13B splashes lubricating oil onto the surface of the transmission structure, ensuring good lubrication throughout the entire opening and closing process.

[0063] Figure 6 In the transmission shaft gear 13A, the middle part is the gear section, and the two ends are the shaft sections. The gear section meshes with the rack 22 on the stationary side transmission component, providing motion power to the lubrication unit. The shaft sections have a stepped design, used for axial positioning when installing the oil pump 13B, and can provide lubrication to the transmission structure during movement.

[0064] Figure 7 In the oil pump 13B, there are several fan blades 24. The fan blades 24 are wedge-shaped along the axis of the oil pump 13B. During rotation, they can splash lubricating oil onto the double-acting transmission structure and its lubrication unit, which can play a role in motion lubrication and reduce the wear of parts.

[0065] Figure 9 In this design, the magnetic oil plug 12 includes a lower oil plug 12A and a magnet 12B. The lower oil plug 12A has the magnet 12B attached to it, and the magnet 12B and the lower oil plug 12A are fixed together, which can attract metal particles generated by wear of the transmission structure. The magnet 12B is located at the center of the lower oil plug 12A, and the attraction area covers the location where transmission particles may settle. The interface between the lower oil plug 12A and the oil sump has a sealing structure or sealing function.

[0066] This invention utilizes an oil sump 23 to store a suitable amount of lubricating oil, and the lubrication unit consists of a transmission shaft gear 13A and an oil pump 13B. During transmission, the oil pump 13B continuously splashes lubricating oil onto the surface of the transmission structure. Compared with the localized lubrication of existing technologies, this invention provides effective lubrication for all transmission components of the dual-action transmission structure, significantly expanding the lubrication range.

[0067] The lubrication unit of this invention is directly driven by a dual-action transmission passive component; the more frequent the transmission, the more thorough the lubrication. The forced splash lubrication method of oil pump 13B ensures that an effective lubricating oil film can be formed on the surface of the transmission components under any operating condition, resulting in a continuous and stable lubrication effect.

[0068] Because the lubricating oil is located in an independent, enclosed space, the metal particles generated during transmission will be suspended in the lubricating oil. The lower oil plug 12A is equipped with a strong magnet, which can effectively attract the metal particles in the lubricating oil, preventing the particles from accumulating indefinitely in the lubricating oil and causing secondary wear, while also preventing the particles from entering the arc-extinguishing chamber and causing discharge problems.

[0069] The oil tank seat 23 of this invention has a split structure. The oil tank seat 23 and the transmission parts are sealed by an oil seal. The upper oil plug 8 and the lower oil plug 12A are installed at the top and bottom of the oil tank, respectively, and all mating surfaces have a sealing structure. These sealing measures completely enclose the lubricating oil in an independent space, so that the lubricating oil will not enter the arc-extinguishing chamber and will not affect the insulation performance and arc-extinguishing ability of the arc-extinguishing chamber.

[0070] The oil sump base 23 of this invention features a split design, facilitating parts processing, manufacturing, assembly, and maintenance. A lubricating oil drain hole is located at the bottom of the oil sump, allowing for the drainage of old oil, replacement of lubricating oil, or removal of adsorbed metal particles via the lower oil plug 12A, simplifying maintenance operations.

[0071] By improving the lubrication effect, effectively removing wear particles, and implementing closed-loop management of lubricating oil, this invention can significantly reduce the wear of the double-acting transmission structure, lower the equipment failure rate, and extend the service life of the arc-extinguishing chamber and circuit breaker.

[0072] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of this invention.

Claims

1. A lubrication device for a double-acting transmission arc-extinguishing chamber, characterized in that, include: The oil tank seat (23) has an internal space for containing lubricating oil, and the oil tank seat (23) has a push-pull rod assembly hole and a static arc contact assembly hole. The push-pull rod (7) is movably inserted into the push-pull rod assembly hole; A double-acting transmission device (10) is arranged inside the oil tank seat (23) and is connected to the push-pull rod (7) for transmission. The stationary arc contact (14) is movably inserted into the stationary arc contact assembly hole and is connected to the push-pull rod (7) for transmission. The double-action transmission device (10) is used to transmit the reciprocating motion of the push-pull rod (7) to the stationary arc contact (14). A rack (22) is provided on the static arc contact (14); The transmission shaft gear (13A) is rotatably connected to the oil sump seat (23) and located inside the oil sump seat (23), and the transmission shaft gear (13A) meshes with the rack (22); Two oil pumps (13B) are mounted on the transmission shaft gear (13A), and the rack (22) is located between the two oil pumps (13B). The oil pumps (13B) have a plurality of blades (24). A magnetic oil plug (12) is provided at the bottom of the oil tank seat (23).

2. The lubrication device for a double-acting transmission arc-extinguishing chamber according to claim 1, characterized in that, The oil tank base (23) includes an oil tank shell (9) and an oil tank cover (11). The oil tank shell (9) and the oil tank cover (11) are detachably fixedly connected. The double-acting transmission device (10) is located between the oil tank shell (9) and the oil tank cover (11). The transmission shaft gear (13A) is rotatably connected to the oil tank shell (9). The oil tank shell (9) is provided with a push-pull rod assembly hole and a static arc contact assembly hole.

3. The lubrication device for a double-acting transmission arc-extinguishing chamber according to claim 1, characterized in that, An upper oil seal (6) is provided in the mounting hole of the push-pull rod, and the upper oil seal (6) is located between the oil tank seat (23) and the push-pull rod (7); The static arc contact assembly hole is provided with a lower oil seal (15), which is located between the oil sump seat (23) and the static arc contact (14).

4. A lubrication device for a double-acting transmission arc-extinguishing chamber according to claim 1, characterized in that, It also includes a crossbeam (16), which is fixed on the oil tank seat (23), and the push-pull rod (7) and the static arc contact (14) both pass through the crossbeam (16).

5. A lubrication device for a double-acting transmission arc-extinguishing chamber according to claim 1, characterized in that, The push-pull rod (7) is arranged parallel to the static arc contact (14), the rack (22) is coaxial with the static arc contact (14), the rack (22) and the transmission shaft gear (13A) are both located below the double-action transmission device (10), and the rack (22) is located on the side of the transmission shaft gear (13A) closer to the double-action transmission device (10).

6. A lubrication device for a double-acting transmission arc-extinguishing chamber according to claim 1, characterized in that, The transmission shaft gear (13A) includes a gear part (27) and a stepped shaft (28) located on both sides of the gear part. The gear part (27) meshes with the rack (22), and the oil pump (13B) is sleeved on the stepped shaft (28). Several fan blades (24) are evenly arranged around the oil pump (13B), and the cross section of the fan blades (24) is trapezoidal.

7. A lubrication device for a double-acting transmission arc-extinguishing chamber according to claim 1, characterized in that, The oil tank seat (23) is provided with an upper oil plug (8), which is located at the top of the oil tank seat (23).

8. A lubrication device for a double-acting transmission arc-extinguishing chamber according to claim 1, characterized in that, The magnetic oil plug (12) includes a lower oil plug (12A) and a magnet (12B). The lower oil plug (12A) is embedded in the oil sump seat (23), and the lower oil plug (12A) and the magnet (12B) are fixedly connected.

9. A double-acting transmission arc-extinguishing chamber, employing a lubrication device for a double-acting transmission arc-extinguishing chamber as described in any one of claims 1 to 8, characterized in that, include: The cylinder (1), piston (2), moving main contact (3), large nozzle (4), stationary main contact (5), guide shield (17), small nozzle (18) and pull rod (21) are arranged coaxially. The stationary main contact (5) is fixedly connected to the crossbeam (16), and the crossbeam (16) is located between the stationary main contact (5) and the oil tank seat (23); The pull rod (21) passes through the cylinder (1) and is fixedly connected to the piston (2). One end of the moving main contact (3) is movably embedded in the cylinder (1). When the circuit is closed, the other end of the moving main contact (3) is movably embedded in the stationary main contact (5). The piston (2) is located inside the cylinder (1) and is fixedly connected to the moving main contact (3). The large nozzle (4) and the guide shield (17) are located inside the stationary main contact (5), and the large nozzle (4) is fixedly connected to the moving main contact (3). The large nozzle (4) is connected to the push-pull rod (7) through the guide shield (17). The small nozzle (18) is fixedly connected to the piston (2) and embedded in the large nozzle (4). A moving arc contact (19) is coaxially arranged in the small nozzle (18). When the circuit is closed, the stationary arc contact (14) is embedded in the moving arc contact (19).

10. A double-acting transmission arc-extinguishing chamber according to claim 9, characterized in that, The piston (2) is provided with a one-way valve plate (20).

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