A crank mechanism for GIS equipment and a three-phase synchronous transmission device thereof

Abstract

The application discloses a crank mechanism for GIS equipment and a three-phase synchronous transmission device thereof, and aims to solve the problems of easy wear and difficult greasing in the traditional crank mechanism. In the crank mechanism, the first crank is connected with the moving end of the arc extinguishing chamber, the transmission assembly and the second crank are arranged outside the arc extinguishing chamber, the transmission assembly comprises a shell and a transmission shaft, the shell is sleeved on the transmission shaft, one end of the first crank is sleeved on the transmission shaft, a sealing assembly is arranged in the transmission assembly, and the sealing assembly is filled with grease between the sealing assembly and the transmission assembly; the second crank drives the first crank to swing through the transmission assembly, and the first crank pulls the moving end of the arc extinguishing chamber to complete the opening and closing operation. By arranging the sealing assembly in the transmission assembly and filling the grease, the sealing assembly is matched with the grease, the greasing frequency is reduced, the external transmission assembly is convenient for the greasing operation, the transmission efficiency is ensured, the maintenance cost is reduced, and the operation stability of the GIS equipment is improved.

Description

Technical Field

[0001] This invention relates to the field of mechanical transmission technology in GIS equipment, and particularly to a crank arm mechanism for GIS equipment and its three-phase synchronous transmission device. Background Technology

[0002] Gas-insulated metal-enclosed switchgear (GIS) is the core equipment of modern substations. The reliability of its mechanical operating system is directly related to the safe and stable operation of the power system. In the mechanical transmission system of GIS, the crank mechanism undertakes the core functions of power transmission and motion conversion. Its technical design must meet multiple requirements such as high mechanical strength, precise motion transmission and long-term sealing performance.

[0003] The main function of the crank arm mechanism is to convert the rotary motion of the motor or manual operating mechanism into linear motion, driving the contacts to complete the opening and closing actions. It typically employs a composite mechanism of crank arm and connecting rod to balance the operating torque and stroke. Simultaneously, a dynamic sealing design is required to ensure zero leakage of the high-pressure insulating gas inside the tank and to reduce movement resistance.

[0004] Currently, GIS (Gas Insulator System) employs a fully sealed metal tank design, resulting in a typically small internal mechanical operating chamber. Under this constraint, the contact stress between the crank arm pin and bearing in the crank mechanism is generally quite high. Repeated opening and closing operations lead to the accumulation of fretting wear, directly damaging the preload of the dynamic sealing components, and in severe cases, requiring shutdown and seal replacement. Furthermore, the compact structure worsens heat dissipation, and differences in thermal expansion of metal components at high temperatures can cause jamming. GIS is filled with insulating gas, while traditional mechanisms require regular grease replenishment. In practice, the oil filling channel design is limited by the gas chamber seal, making grease replenishment difficult. Moreover, the GIS operates in an SF6 gas environment, making maintenance inconvenient. Summary of the Invention

[0005] (I) Purpose of the Invention

[0006] The purpose of this invention is to provide a crank arm mechanism for GIS equipment and its three-phase synchronous transmission device, which aims to solve the problems of easy wear and difficulty in replenishing grease in traditional crank arm mechanisms.

[0007] (II) Technical Solution

[0008] To address the aforementioned problems, a first aspect of the present invention provides a crank arm mechanism for GIS equipment, comprising a first crank arm, a transmission assembly, a sealing assembly, and a second crank arm;

[0009] The first crank arm is connected to the moving end of the arc-extinguishing chamber. The transmission assembly and the second crank arm are disposed on the outside of the arc-extinguishing chamber. The transmission assembly includes a housing and a transmission shaft. The housing is sleeved on the transmission shaft. One end of the first crank arm is sleeved on the transmission shaft. The sealing assembly is disposed inside the transmission assembly. The space between the sealing assembly and the transmission assembly is filled with grease.

[0010] The second crank arm drives the first crank arm to swing through the transmission assembly, and the first crank arm pulls the moving end of the arc-extinguishing chamber to complete the opening and closing operation.

[0011] Preferably, the crank arm mechanism further includes a bearing assembly. The housing and the drive shaft are connected via the bearing assembly. The bearing assembly is sleeved on the drive shaft. The bearing assembly includes a bearing pressure plate, a deep groove ball bearing, and a bearing cover. One side of the bearing pressure plate abuts against the sealing assembly, and the other side of the bearing pressure plate abuts against the inner side of the deep groove ball bearing. The bearing cover is fixedly connected to the end of the housing and abuts against the outer side of the deep groove ball bearing.

[0012] Preferably, the crank arm mechanism includes two bearing assemblies located at both ends of the drive shaft, and the first crank arm is located between the two bearing assemblies.

[0013] Preferably, the sealing assembly is located between the first crank arm and the bearing assembly. The sealing assembly includes an oil seal pressure plate and a first sealing ring. The oil seal pressure plate is disposed between the first crank arm and the first sealing ring. The first sealing ring includes a plurality of lip seals, which face the inner and outer sides of the housing, respectively. The grease is filled in the gaps of the first sealing ring.

[0014] Preferably, the transmission assembly further includes a first positioning ring, which is sleeved on the transmission shaft. One side of the first positioning ring abuts against the first crank arm, and the other side of the first positioning ring abuts against the oil seal pressure plate.

[0015] Preferably, the second crank arm is sleeved and installed at the end of the drive shaft, the second crank arm is located on the outside of the housing, and the transmission assembly further includes a second positioning ring, one side of the second positioning ring abutting against the bearing cover, and the other side of the second positioning ring abutting against the second crank arm.

[0016] Preferably, a first sealing groove is formed on the bearing cap, and a second sealing ring is provided in the first sealing groove. The second sealing ring is sleeved on the transmission shaft and abuts against the transmission shaft.

[0017] Preferably, an inspection hole is formed on the housing, a cover plate is installed at the inspection hole, a second sealing groove is formed on the cover plate, a third sealing ring is provided in the second sealing groove, and the third sealing ring abuts against the inner wall of the inspection hole.

[0018] Another aspect of the present invention provides a three-phase synchronous transmission device for GIS equipment, including a connecting pin and three crank arm mechanisms. The connecting pin is fixedly connected to at least two second crank arms. The two second crank arms drive the three first crank arms correspondingly connected to the three transmission components to swing synchronously. The three first crank arms pull the moving ends of the three arc-extinguishing chambers to complete the synchronous opening and closing operation.

[0019] Preferably, the first crank arm is connected to the drive shaft via meshing teeth, and the second crank arm is connected to the drive shaft via meshing teeth. Each meshing tooth is provided with a missing tooth structure to achieve phase alignment of the transmission device.

[0020] This invention utilizes a transmission assembly and a second crank arm located outside the arc-extinguishing chamber to drive a first crank arm connected to the moving end of the arc-extinguishing chamber, thereby enabling opening and closing operations within the arc-extinguishing chamber. By incorporating a sealing component and filling it with grease within the transmission assembly, the frequency of grease replenishment is reduced through the cooperation of the sealing component and the grease. The external transmission assembly also facilitates grease replenishment, ensuring transmission efficiency while reducing maintenance costs and improving the operational stability of the GIS equipment.

[0021] (III) Beneficial Effects

[0022] The above-described technical solution of the present invention has the following beneficial technical effects:

[0023] 1. The crank arm mechanism is divided into a second crank arm and a sealing assembly located on the outside of the arc extinguishing chamber, and a first crank arm connected to the moving end of the arc extinguishing chamber. The crank arm mechanism is simple and has good transmission effect. The sealing assembly and lubricating grease are set in the transmission assembly to form an effective sealing barrier, reduce lubricating grease leakage, thereby reducing the replenishment frequency, ensuring transmission efficiency while reducing maintenance costs.

[0024] 2. An inspection hole is opened on the housing of the transmission component. The removable cover plate helps to improve maintenance efficiency. When replenishing lubricating oil, the lubricating grease can also be replenished by simply removing the cover plate, which greatly saves the time of maintenance and lubricating grease replenishment.

[0025] 3. By controlling the three transmission components through the linkage pin, the three first crank arms can be driven to swing simultaneously, so as to realize the synchronous completion of the opening and closing operation of the moving end of the three-phase arc-extinguishing chamber. This reduces the flexible deformation of the transmission chain, ensures that the power of the circuit breaker operating mechanism is efficiently transmitted to the moving end of the vacuum arc-extinguishing chamber, and improves the opening and closing response speed and action consistency.

[0026] 4. The first and second crank arms are connected to the drive shaft through meshing teeth. At the same time, the meshing teeth are provided with missing teeth structure so that the first and second crank arms can be aligned with the specific orientation of the drive shaft during installation, so that all the first and second crank arms move and are subjected to force synchronously, ensuring the consistency of the opening and closing action. Attached Figure Description

[0027] Figure 1 This is a structural schematic diagram of a crank arm mechanism for GIS equipment provided by the present invention;

[0028] Figure 2 This is a side cross-sectional schematic diagram of a crank arm mechanism for GIS equipment provided by the present invention;

[0029] Figure 3 This is a front cross-sectional schematic diagram of a crank arm mechanism for GIS equipment provided by the present invention;

[0030] Figure 4 This is a schematic cross-sectional view of the transmission component of a crank arm mechanism for GIS equipment according to the present invention;

[0031] Figure 5 This is a schematic diagram of the three-phase synchronous transmission device for GIS equipment provided by the present invention.

[0032] Figure label:

[0033] 1. First crank arm;

[0034] 2. Transmission assembly; 21. Housing; 21a. Inspection hole; 22. Drive shaft; 23. First locating ring; 24. Second locating ring; 25. Cover plate; 25a. Second sealing groove; 26. Third sealing ring;

[0035] 3. Sealing assembly; 31. Oil seal pressure plate; 32. First sealing ring;

[0036] 4. Second crutch;

[0037] 5. Bearing assembly; 51. Bearing pressure plate; 52. Bearing; 53. Bearing cover; 53a. First sealing groove; 54. Second sealing ring;

[0038] 6. Connecting pin. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0040] The accompanying drawings illustrate a layer structure according to an embodiment of the present invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0041] Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0042] In the description of this invention, it should be noted that the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] Combination Figures 1 to 5 The first aspect of the present invention provides a crank arm mechanism for GIS equipment, the crank arm mechanism including a first crank arm 1, a transmission assembly 2, a sealing assembly 3, and a second crank arm 4; the first crank arm 1 is connected to the moving end of the arc-extinguishing chamber, the transmission assembly 2 and the second crank arm 4 are disposed on the outside of the arc-extinguishing chamber, the transmission assembly 2 includes a housing 21 and a transmission shaft 22, the housing 21 is sleeved on the transmission shaft 22, one end of the first crank arm 1 is sleeved on the transmission shaft 22, the sealing assembly 3 is disposed inside the transmission assembly 2, and grease is filled between the sealing assembly 3 and the transmission assembly 2; the second crank arm 4 drives the first crank arm 1 to swing through the transmission assembly 2, and the first crank arm 1 pulls the moving end of the arc-extinguishing chamber to complete the opening and closing operation. Specifically, the first crank arm 1 is directly connected to the moving end pull rod of the arc-extinguishing chamber, converting the rotational motion of the transmission shaft 22 into linear motion, driving the contacts to complete the opening and closing of the circuit breaker. Its swing angle is precisely controlled by the rotation angle of the transmission shaft 22. The transmission assembly 2 includes a housing 21 and a transmission shaft 22. The housing 21 provides rigid support for the transmission shaft 22. The transmission shaft 22 meshes with the inner and outer crank arms through a spline structure to transmit the operating torque. The sealing assembly 3 is installed in the inner cavity of the housing 21, wrapping the transmission shaft 22 to prevent grease from leaking into the external environment, while also blocking dust and moisture from entering the transmission chamber. The second crank arm 4 is located outside the housing 21 and receives power from the operating mechanism through the transmission shaft 22 to drive the first crank arm 1 to swing.

[0044] This invention utilizes a transmission assembly 2 and a second crank arm 4 located outside the arc-extinguishing chamber to drive a first crank arm 1 connected to the moving end of the arc-extinguishing chamber, thereby achieving the opening and closing operations within the arc-extinguishing chamber. By incorporating a sealing assembly 3 and filling it with lubricating grease within the transmission assembly 2, the frequency of grease replenishment is reduced through the cooperation of the sealing assembly 3 and the lubricating grease. The externally located transmission assembly 2 also facilitates grease replenishment, ensuring transmission efficiency while reducing maintenance costs and improving the operational stability of the GIS equipment. This design divides the crank arm mechanism into a second crank arm 4 and a sealing assembly 3 located outside the arc-extinguishing chamber, and a first crank arm 1 connected to the moving end of the arc-extinguishing chamber. The crank arm mechanism is simple, with good transmission performance. The sealing assembly 3 and lubricating grease within the transmission assembly 2 form an effective sealing barrier, reducing grease leakage and thus lowering the replenishment frequency, ensuring transmission efficiency while reducing maintenance costs.

[0045] In optional cases, housing 21 is made of aluminum, a lightweight design that significantly reduces its weight and the load on the supporting structure. During long-term operation of GIS equipment, frequent operation may generate heat; aluminum effectively improves heat dissipation efficiency and ensures the stability of the transmission system. The main components are assembled inside housing 21. Silicone grease is used as the lubricant; the grease fills the gaps, increasing the sealing effect and improving sealing performance. Simultaneously, because of its lubricating properties, silicone grease reduces friction between the sealing assembly 3 and the drive shaft 22, increasing the service life of the sealing assembly 3 and reducing shaft wear.

[0046] It should be noted that the specific connection method between the drive shaft 22 and the housing 21 is not limited here. In a preferred embodiment, the crank arm mechanism further includes a bearing assembly 5. The housing 21 and the drive shaft 22 are connected through the bearing assembly 5. The bearing assembly 5 is sleeved on the drive shaft 22 and includes a bearing pressure plate 51, a bearing 52, and a bearing cover 53. One side of the bearing pressure plate 51 abuts against the sealing assembly 3, and the other side of the bearing pressure plate 51 abuts against the inner side of the bearing 52. The bearing cover 53 is fixedly connected to the end of the housing 21 and abuts against the outer side of the bearing 52. Specifically, the bearing assembly 5 includes a bearing pressure plate 51, a bearing 52, and a bearing cover 53, supporting the rotation of the drive shaft 22 and reducing friction; one side of the bearing pressure plate 51 abuts against the sealing assembly 3, and the other side abuts against the inner side of the bearing 52, fixing the position of the bearing 52; the bearing cover 53 is fixed to the end of the housing 21 by bolts and abuts against the outer side of the bearing 52, restricting the axial movement of the bearing. Optionally, bearing 52 is a deep groove ball bearing. The inner ring of bearing 52 is interference-fitted with the drive shaft 22, and the outer ring is transition-fitted with the mounting hole of housing 21, supporting the rotation of drive shaft 22. Bearing cap 53 is fixed to housing 21 by bolts, pressing the inner side of bearing 52 against it, while bearing cap 53 is fixed from the outside, forming a bidirectional limiting effect. In a preferred embodiment, bearing 52 is a bearing with a dust cover. The dust cover covers both sides of the bearing, forming a rigid protective layer, effectively preventing solid particles such as dust, grit, and fibers from entering the bearing, preventing grease contamination, avoiding abnormal bearing wear, maintaining stable lubrication performance, extending bearing life, and effectively improving the sealing performance of the shaft seal.

[0047] This design, combining the bearing pressure plate 51, bearing 52, and bearing cover 53, enhances the axial stability of the drive shaft 22 and reduces bearing movement caused by vibration or load variations. The fixed connection between the bearing cover 53 and the housing 21, along with the cover sealing ring, forms multiple layers of sealing protection, effectively isolating external contaminants and extending the service life of the bearing and seals.

[0048] The specific number of bearing assemblies 5 and their specific installation positions on the drive shaft 22 are not limited here. In a preferred embodiment, the crank arm mechanism includes two bearing assemblies 5 located at both ends of the drive shaft 22, with a first crank arm 1 positioned between the two bearing assemblies 5. In another preferred embodiment, the first crank arm 1 is located at the center of the drive shaft 22, and the two bearing assemblies 5 are symmetrically arranged on both sides of the first crank arm 1. This arrangement balances the radial load on the drive shaft 22, significantly reducing shaft bending deformation and improving transmission alignment. This design avoids uneven seal wear caused by unilateral overload, ensuring the long-term stability of the sealing interface.

[0049] In a preferred embodiment, the sealing assembly 3 is located between the first crank arm 1 and the bearing assembly 5. The sealing assembly 3 includes an oil seal pressure plate 31 and a first sealing ring 32. The oil seal pressure plate 31 is positioned between the first crank arm 1 and the first sealing ring 32. The first sealing ring 32 includes multiple lip seals, which face the inner and outer sides of the housing 21, respectively. Grease is filled in the gaps between the first sealing rings 32. Specifically, the lip seals are made of an elastic material (such as fluororubber), with the inner lip seal facing the inner side of the housing 21 and the outer lip seal facing the outer side, forming a bidirectional sealing barrier with the assistance of grease. For example, when the internal pressure is slightly higher than the external pressure, the inner lip seal adheres to the drive shaft 22, preventing grease leakage; when external impurities intrude, the outer lip seal blocks them, keeping the interior clean. Through this arrangement, the combined design of the oil seal pressure plate 31 and the lip seals forms a bidirectional sealing barrier. The inner sealing ring prevents grease leakage, the outer sealing ring blocks external contaminants from intruding, and the grease filling further enhances the sealing effect and reduces friction. This layered sealing mechanism significantly improves the reliability and durability of the sealing system.

[0050] In a preferred embodiment, a first positioning ring 23 is fitted onto the drive shaft 22. One side of the first positioning ring 23 abuts against the first crank arm 1, and the other side abuts against the oil seal pressure plate 31. Specifically, the first positioning ring 23 has an annular structure, with its inner diameter interference-fitted with the drive shaft 22 and its outer diameter clearance-fitted with the mounting hole of the housing 21. For example, the first positioning ring 23 is fixed to the drive shaft 22 by interference fit. When the first crank arm 1 and the oil seal pressure plate 31 move axially, they are blocked by the positioning ring, ensuring a fixed position. Through this arrangement, the first positioning ring 23 ensures the alignment of the transmission components by precisely limiting the axial position of the first crank arm 1 and the oil seal pressure plate 31. This design eliminates the problem of seal ring bias caused by vibration or assembly errors, improves the uniform force distribution of the sealing interface, and extends the service life of the seal.

[0051] It should be noted that the first crank arm 1 is preferably positioned in the middle of the transmission shaft 22, with a first positioning ring 23, a sealing assembly 3, and a bearing assembly 5 symmetrically arranged on both sides to further improve the overall stability of the crank arm mechanism. The specific position of the second crank arm 4 on the transmission shaft 22 is not limited here. In GIS equipment, the second crank arm 4 can be driven by other components in the equipment, causing the first crank arm 1 within the transmission assembly 2 to swing. In a preferred embodiment, the second crank arm 4 is sleeved and installed at the end of the transmission shaft 22, located on the outside of the housing 21. The transmission assembly 2 also includes a second positioning ring 24, one side of which abuts against the bearing cap 53, and the other side of which abuts against the second crank arm 4. Specifically, the second positioning ring 24 is annular, with an inner diameter matching the transmission shaft 22. The second positioning ring 24 is installed on the outside of the housing 21 and fixed by bolts or retaining rings, with one side abutting against the bearing cap 53 and the other side abutting against the second crank arm 4, ensuring that the second crank arm 4 is fixed in position on the transmission shaft 22. With this configuration, the second positioning ring 24 reduces transmission chain movement and improves the consistency of opening and closing actions by fixing the axial position of the second crank arm 4. Its hardened surface design reduces frictional loss with the crank arm, further enhancing the stability and durability of the transmission.

[0052] In a preferred embodiment, a first sealing groove 53a is formed on the bearing cap 53, and a second sealing ring 54 is disposed within the first sealing groove 53a. The second sealing ring 54 is fitted onto the drive shaft 22 and abuts against the drive shaft 22. Specifically, the first sealing groove 53a is an annular groove, and the second sealing ring 54 is an O-ring that is compressed during installation to fill the gap between the bearing cap 53 and the drive shaft 22. For example, when the drive shaft 22 rotates, the elastic deformation of the second sealing ring 54 maintains close contact with the drive shaft 22, preventing gas and impurities from entering. Through this arrangement, the first sealing groove 53a and the second sealing ring 54 on the bearing cap 53 cooperate to form a secondary seal for the bearing area. This design completely blocks the leakage path of grease from the bearing area and enhances the redundancy protection capability of the overall sealing system.

[0053] In a preferred embodiment, a maintenance hole 21a is formed on the housing 21, and a cover plate 25 is installed at the maintenance hole 21a. A second sealing groove 25a is formed on the cover plate 25, and a third sealing ring 26 is provided in the second sealing groove 25a. The third sealing ring 26 abuts against the inner wall of the maintenance hole 21a. Specifically, during maintenance, the bolts of the cover plate 25 are unscrewed, and the internal components are maintained through the circular maintenance hole 21a. During installation, the third sealing ring 26, such as an O-ring, is compressed and comes into close contact with the inner wall of the maintenance hole 21a, forming a seal. With this arrangement, the maintenance hole 21a is opened on the housing 21 of the transmission assembly 2, and the removable cover plate 25 is used to improve maintenance efficiency. When replenishing lubricating oil, the lubricating oil replenishment operation can be carried out by only removing the cover plate 25. Maintenance does not require disassembling the entire transmission chain, significantly shortening maintenance time. The static sealing design of the sealing ring of the cover plate 25 ensures the sealing performance of the maintenance hole 21a, avoiding the impact of maintenance operations on the airtightness of the equipment.

[0054] Another aspect of the present invention provides a three-phase synchronous transmission device for GIS equipment, including a connecting pin 6 and three crank arm mechanisms. The connecting pin 6 is fixedly connected to at least two second crank arms 4. The two second crank arms 4 drive three first crank arms 1, which are correspondingly connected to the three transmission components 2, to swing synchronously. The three first crank arms 1 pull the moving ends of the three arc-extinguishing chambers to complete the synchronous opening and closing operation. Specifically, the connecting pin 6 passes through the holes of the two second crank arms 4 and is fastened with nuts to transmit power. For example, when one second crank arm 4 is driven to swing, the connecting pin 6 drives the other second crank arms 4 to move synchronously, thereby driving the three first crank arms 1 to pull the moving ends of the arc-extinguishing chambers synchronously. In this case, one second crank arm 4 can be omitted, and the synchronous control of the three transmission components 2 can be achieved through two second crank arms 4. With this setup, the three transmission components 2 are controlled by the connecting pin 6 to simultaneously drive the three first crank arms 1 to swing, so that the moving ends of the three-phase arc-extinguishing chamber can complete the opening and closing operations synchronously. This reduces the flexible deformation of the transmission chain, ensures that the power of the circuit breaker operating mechanism is efficiently transmitted to the moving end of the vacuum arc-extinguishing chamber, and improves the opening and closing response speed and the consistency of the action.

[0055] In a preferred embodiment, the first crank arm 1 and the second crank arm 4 are connected to the drive shaft 22 via meshing teeth. Both meshing teeth have a missing tooth structure to achieve phase alignment of the transmission device. Specifically, the missing tooth structure forces the first crank arm 1, the second crank arm 4, and the drive shaft 22 to be aligned in the assembly phase. For example, the missing teeth on the meshing teeth of the first crank arm 1 and the second crank arm 4 are in the same position, requiring assembly at a specific angle during installation to ensure overall phase consistency of the transmission device. With this arrangement, the first crank arm 1 and the second crank arm 4 are connected to the drive shaft 22 via meshing teeth, and the missing tooth structure on both meshing teeth ensures that the first crank arm 1 and the second crank arm 4 share the same orientation on the drive shaft 22 during installation, allowing all first crank arms 1 and second crank arms 4 to move and be subjected to force synchronously, ensuring the consistency of the opening and closing actions.

[0056] It should be noted that this invention is aimed at the crank arm mechanism of GIS equipment and the three-phase synchronous transmission device for GIS equipment. It does not limit other specific structures and operating modes of GIS equipment, nor does it limit the specific connection method between the crank arm structure and the moving end of the arc extinguishing chamber, nor does it limit the specific driving method of the connecting rod pin 6 in the GIS equipment. As long as the crank arm mechanism and the three-phase synchronous transmission device can achieve the above-mentioned effects.

[0057] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of the invention and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of the invention should be included within the protection scope of the invention. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A crank arm mechanism for GIS equipment, characterized in that, The crank arm mechanism includes a first crank arm (1), a transmission assembly (2), a sealing assembly (3), a second crank arm (4), and two bearing assemblies (5). The first crank arm (1) is connected to the moving end of the arc-extinguishing chamber. The transmission assembly (2) and the second crank arm (4) are disposed on the outside of the arc-extinguishing chamber. The transmission assembly (2) includes a housing (21) and a transmission shaft (22). The housing (21) is sleeved on the transmission shaft (22). One end of the first crank arm (1) is sleeved on the transmission shaft (22). The sealing assembly (3) is disposed inside the transmission assembly (2). The space between the sealing assembly (3) and the transmission assembly (2) is filled with grease. The second crank arm (4) drives the first crank arm (1) to swing through the transmission assembly (2), and the first crank arm (1) pulls the moving end of the arc-extinguishing chamber to complete the opening and closing operation; The housing (21) is connected to the drive shaft (22) via a bearing assembly (5). The bearing assembly (5) is sleeved on the drive shaft (22). The bearing assembly (5) includes a bearing pressure plate (51), a bearing (52), and a bearing cover (53). One side of the bearing pressure plate (51) abuts against the sealing assembly (3), and the other side of the bearing pressure plate (51) abuts against the inner side of the bearing (52). The bearing cover (53) is fixedly connected to the end of the housing (21), and the bearing cover (53) abuts against the outer side of the bearing (52). The two bearing assemblies (5) are located at both ends of the drive shaft (22), and the first crank arm (1) is located between the two bearing assemblies (5); The sealing assembly (3) is located between the first crank arm (1) and the bearing assembly (5). The sealing assembly (3) includes an oil seal pressure plate (31) and a first sealing ring (32). The oil seal pressure plate (31) is disposed between the first crank arm (1) and the first sealing ring (32). The first sealing ring (32) includes a plurality of lip seals, which face the inner and outer sides of the housing (21) respectively. The grease is filled in the gap of the first sealing ring (32).

2. The crank arm mechanism according to claim 1, characterized in that, The transmission assembly (2) further includes a first positioning ring (23), which is sleeved on the transmission shaft (22). One side of the first positioning ring (23) abuts against the first crank arm (1), and the other side of the first positioning ring (23) abuts against the oil seal pressure plate (31).

3. The crank arm mechanism according to claim 2, characterized in that, The second crank arm (4) is sleeved and installed at the end of the transmission shaft (22). The second crank arm (4) is located on the outside of the housing (21). The transmission assembly (2) also includes a second positioning ring (24). One side of the second positioning ring (24) abuts against the bearing cover (53), and the other side of the second positioning ring (24) abuts against the second crank arm (4).

4. The crank arm mechanism according to claim 1, characterized in that, A first sealing groove (53a) is formed on the bearing cap (53), and a second sealing ring (54) is provided in the first sealing groove (53a). The second sealing ring (54) is sleeved on the transmission shaft (22) and abuts against the transmission shaft (22).

5. The crank arm mechanism according to claim 1, characterized in that, An inspection hole (21a) is formed on the housing (21), and a cover plate (25) is installed at the inspection hole (21a). A second sealing groove (25a) is formed on the cover plate (25), and a third sealing ring (26) is provided in the second sealing groove (25a). The third sealing ring (26) abuts against the inner wall of the inspection hole (21a).

6. A three-phase synchronous transmission device for GIS equipment, characterized in that, The device includes three crank arm mechanisms according to any one of claims 1-5, and also includes a connecting pin (6), the connecting pin (6) being fixedly connected to at least two second crank arms (4), the two second crank arms (4) driving the three first crank arms (1) correspondingly connected to the three transmission components (2) to swing synchronously, and the three first crank arms (1) pulling the moving ends of the three arc-extinguishing chambers to complete the synchronous opening and closing operation.

7. The transmission device according to claim 6, characterized in that, The first crank arm (1) is connected to the transmission shaft (22) through meshing teeth, and the second crank arm (4) is connected to the transmission shaft (22) through meshing teeth. Each meshing tooth is provided with a missing tooth structure to achieve phase alignment of the transmission device.

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