A movable terminal adjustable vacuum circuit breaker

Abstract

The application relates to the field of circuit breakers, and particularly discloses a movable-end adjustable vacuum circuit breaker, which comprises a side plate, an arc extinguishing mechanism and an operating mechanism, the arc extinguishing mechanism comprises a vacuum arc extinguishing chamber and an upper compression assembly, the upper compression assembly comprises a compression spring, the operating mechanism is used for driving the compression spring to move away from the end of the vacuum arc extinguishing chamber and move towards the vacuum arc extinguishing chamber, the arc extinguishing mechanism further comprises an upper adjusting assembly, the upper adjusting assembly comprises an upper screw rod and an adjusting nut which is screwed on the upper screw rod, the upper screw rod is connected to a movable conducting rod of the vacuum arc extinguishing chamber, the end of the compression spring close to the vacuum arc extinguishing chamber is in abutment with the adjusting nut, and an operating opening aligned with the adjusting nut is formed in the side plate. The application has the effect of improving the convenience of adjusting the compression amount of the compression spring by the staff.

Description

Technical Field

[0001] This application relates to the field of circuit breakers, and in particular to a moving-end adjustable vacuum circuit breaker. Background Technology

[0002] The power industry is a vital foundation of my country's national economy, and medium- and high-voltage circuit breakers are particularly important switching devices in power distribution networks. Their operating status directly impacts the reliable and safe operation of the power grid. Vacuum circuit breakers are widely used in industry due to their numerous advantages.

[0003] In related technologies, such as Figure 1 , Figure 2 An adjustable vacuum circuit breaker is shown, comprising two opposing side plates 1, multiple lower supports 2, an arc-extinguishing mechanism 3 in the same number as the lower supports 2, and an operating mechanism 4. The lower supports 2 are positioned between the two side plates 1 and are fixedly connected to both side plates 1. Each arc-extinguishing mechanism 3 is mounted on a different lower support 2. Each arc-extinguishing mechanism 3 includes a conductive plate 31, a vacuum interrupting chamber 32, a lower adjusting assembly 35, and an upper clamping assembly 34. The lower adjusting assembly 35 includes a conductive nut 351 and a fastening nut 352, located on opposite sides of the lower support 2. The end of the conductive plate 31 is located between the lower support 2 and the conductive nut 351. A lower screw 321 is connected to the stationary conductive rod of the vacuum interrupting chamber 32, passing through the conductive plate 31 and the lower support 2. The conductive nut 351 and the fastening nut 352 are threaded onto the lower screw 321. The conductive nut 351 and the lower bracket 2 respectively abut against the two sides of the end of the conductive sheet 31, and the end of the conductive sheet 31 and the fastening nut 352 respectively abut against the two sides of the lower bracket 2.

[0004] When adjusting the position of the vacuum interrupter 32, it is necessary to loosen the conductive nut 351 and the fastening nut 352 at the same time so that the vacuum interrupter 32 can be moved.

[0005] The upper clamping assembly 34 includes a flexible connection 332, a fixing washer 333, a spring sleeve 342, and a compression spring 341. The flexible connection 332 presses against the moving conductive rod of the vacuum interrupter 32, the fixing washer 333 presses against the flexible connection 332, and the two ends of the compression spring 341 abut against the spring sleeve 342 and the fixing washer 333, respectively.

[0006] The operating mechanism 4 includes a linkage rod 44, which passes through and rotatably mounts on the spring sleeve 342. By moving the linkage rod 44 towards the vacuum interrupter 32 along the sliding direction of the moving conductive rod of the vacuum interrupter 32, the linkage rod 44 drives the spring sleeve 342 to move towards the vacuum interrupter 32. The spring sleeve 342 applies force to the moving conductive rod of the vacuum interrupter 32 through the compression spring 341, the fixed washer 333, and the flexible connection 332 until the vacuum interrupter 32 is in the closed state.

[0007] After the vacuum interrupter 32 is in the closed state, the linkage rod 44 needs to be moved further to compress the compression spring 341, thereby increasing the force exerted by the compression spring 341 on the moving conductive rod of the vacuum interrupter 32 through the fixed washer 333 and the flexible connection 332, so as to ensure the stability of the vacuum interrupter 32 when it is in the closed state.

[0008] After the vacuum circuit breaker is assembled, the compression of the spring 341 in the closed state of the vacuum interrupter 32 needs to be tested using instruments. If the compression of the spring 341 does not meet the requirements, the housing of the vacuum interrupter 32 needs to be adjusted by rotating the conductive nut 351 and the fastening nut 352. However, the lower end of the vacuum circuit breaker, namely the lower bracket 2 and the conductive plate 31, still needs to be connected to load switches and other related devices. Due to the constraints of the two side plates 1, the adjustment of the conductive nut 351 and the fastening nut 352 is inconvenient, making it difficult for operators to adjust the compression of the spring 341.

[0009] like Figure 3 The arc-extinguishing mechanism of the adjustable vacuum circuit breaker shown is similar to... Figure 1 , Figure 2 The difference in the arc-extinguishing mechanism of the adjustable vacuum circuit breaker shown is that it also includes a bidirectional screw 5 and a spring seat 51, with the spring seat 51 abutting against the end face of the compression spring 341 away from the spring sleeve 342. A rotating nut 52 is fixedly fitted onto the middle section of the bidirectional screw 5, allowing the operator to rotate the bidirectional screw 5 by rotating the nut 52. The two different threaded sections of the bidirectional screw 5 are respectively threadedly connected to the vacuum interrupter 32 and the spring seat 51. By rotating the rotating nut 52, the distance between the spring sleeve 342 and the vacuum interrupter 32 is adjusted, thereby changing the compression of the compression spring 341.

[0010] The two different threaded sections of the double-ended screw 5 are respectively threaded with a spring nut 53 and a washer nut 54. The spring nut 53 is used to press against the side of the spring seat 51 away from the compression spring 341, and the washer nut 54 is used to press against the side of the fixing washer 333 away from the vacuum interrupter 32. Before adjusting the compression of the compression spring 341, the spring nut 53 and the washer nut 54 must be loosened first.

[0011] Since the direction of loosening is not clearly indicated, and both the spring nut 53 and the washer nut 54 experience significant frictional resistance upon initial rotation, regardless of whether they are loosened or tightened, this further interferes with the operator's judgment of the loosening direction. Furthermore, the tightness of the washer nut 54 directly affects specific parameters of the vacuum interrupter 32. Even slight differences in the tightness of the washer nut 54 can significantly impact these parameters. For example, if the washer nut 54 is slightly loose, the resistance and temperature rise of the vacuum interrupter 32 will increase. Therefore, retightening the washer nut 54 requires fine-tuning, which is time-consuming. This also makes it difficult for operators to adjust the compression of the compression spring 341. Summary of the Invention

[0012] To improve the ease of adjustment for operators when adjusting the compression of the spring, this application provides a moving-end adjustable vacuum circuit breaker.

[0013] The moving-end adjustable vacuum circuit breaker provided in this application adopts the following technical solution:

[0014] An adjustable vacuum circuit breaker includes a side plate, an arc-extinguishing mechanism, and an operating mechanism. The arc-extinguishing mechanism includes a vacuum interrupting chamber and an upper clamping assembly. The upper clamping assembly includes a compression spring. The operating mechanism is used to drive the end of the compression spring away from the vacuum interrupting chamber to move towards the vacuum interrupting chamber. The arc-extinguishing mechanism also includes an upper adjusting assembly, which includes an upper screw and an adjusting nut threadedly connected to the upper screw. The upper screw is connected to the moving conductive rod of the vacuum interrupting chamber. The end of the compression spring near the vacuum interrupting chamber abuts against the adjusting nut. An operating port aligned with the adjusting nut is provided on the side plate.

[0015] By employing the above technical solution, when adjusting the compression of the spring, the operating tool is passed through the side plate via the operating port. Then, the adjusting nut is rotated using the operating tool to move it on the upper screw, thereby changing the distance between the adjusting nut and the vacuum interrupter. If the compression of the spring is insufficient, the adjusting nut is rotated to increase the distance between it and the vacuum interrupter, thus compressing the spring.

[0016] Compared to adjustable vacuum circuit breakers in related technologies, firstly, the upper adjustment component is located at the moving conductive rod in the vacuum interrupter, i.e., at the upper end of the vacuum interrupter. There is no need to connect load switches or other devices here, the operating space is large, and the operating port is convenient for operators to adjust the adjusting nut; secondly, compared to adjusting both the conductive nut and the fastening nut at the same time, the vacuum circuit breaker of this application only requires adjusting the adjusting nut to change the compression of the compression spring, further improving the ease of adjustment of the compression spring by operators.

[0017] Compared to the arc-extinguishing mechanism of the upper adjustable vacuum circuit breaker in related technologies, since it does not involve the rotation adjustment of the upper screw relative to the vacuum interrupting chamber, there is no need to set up additional spring nuts and washer nuts and adjust them. This avoids the need to determine the direction of rotation and make fine adjustments to the tightness of the washer nuts. Only the adjusting nut needs to be turned, which greatly improves the convenience for operators to adjust the compression of the compression spring.

[0018] Optionally, the upper adjustment assembly includes a guide rod connected to the adjusting nut, and the compression spring is sleeved on the guide rod.

[0019] By adopting the above technical solution, and by adding a guide rod to the adjusting nut to guide the extension and retraction of the compression spring, it is helpful to adjust the extension and retraction of the compression spring.

[0020] Optionally, the adjusting nut includes a lower nut threadedly connected to the moving conductive rod of the vacuum interrupter and an upper limit ring connected to the lower nut. A step is provided on the side wall of the guide rod, and the upper limit ring is used to abut against the side of the step away from the vacuum interrupter.

[0021] By adopting the above technical solution, the adjusting nut is configured as a combination of a lower nut and an upper limit ring. The upper limit ring and the step on the guide rod limit the guide rod, facilitating the assembly of the guide rod and the adjusting nut. During installation, the step on the guide rod is first placed on the side of the upper limit ring closest to the vacuum interrupter, and then the upper limit ring is connected to the lower nut. This configuration facilitates the installation of the guide rod and the connection between the guide rod and the adjusting nut.

[0022] Optionally, the upper limit ring and the lower nut form a sliding cavity, the end of the guide rod and the step are slidably disposed in the sliding cavity, and the guide rod is rotatable within the sliding cavity.

[0023] By adopting the above technical solution, since the guide rod of the adjustable vacuum circuit breaker in the related technology is directly threaded to the moving conductive rod of the vacuum interrupter, in order to connect the guide rod to the operating mechanism, rotating the guide rod for adjustment not only changes the connection position on the guide rod due to rotation, but also changes the length of the guide rod extending out of the vacuum interrupter, making it difficult to connect the guide rod to the operating mechanism in the related technology. However, the guide rod of this application can rotate directly relative to the adjusting nut, facilitating subsequent connection of the guide rod to the operating mechanism. Furthermore, the guide rod can slide within the sliding cavity, further improving the ease of subsequent connection between the guide rod and the operating mechanism.

[0024] Optionally, the upper clamping assembly further includes a spring sleeve that abuts against the end of the compression spring away from the vacuum interrupter, and the operating mechanism is used to drive the spring sleeve to move toward the vacuum interrupter.

[0025] By adopting the above technical solution, compared with the operating mechanism directly driving the end of the compression spring away from the vacuum interrupter to move, the spring sleeve abuts against the compression spring and pushes the end of the compression spring away from the vacuum interrupter to move, which increases the direct contact area with the compression spring and helps to compress the compression spring.

[0026] Optionally, the upper adjustment assembly includes a guide rod connected to the adjusting nut, and the spring sleeve is fitted onto the guide rod.

[0027] By adopting the above technical solution, the guide rod plays a guiding role in the sliding of the spring sleeve, which helps the spring sleeve slide, that is, helps the spring sleeve push the compression spring to compress and return to its original position under the action of the compression spring.

[0028] Optionally, the guide rod has an oblong hole that extends along the sliding direction of the moving conductive rod of the vacuum interrupter. The operating mechanism includes a linkage rod connected to the spring sleeve. The linkage rod passes through the oblong hole and is slidably disposed in the oblong hole along the extending direction of the oblong hole. The linkage rod can slide along the sliding direction of the conductive rod of the vacuum interrupter.

[0029] By adopting the above technical solution, the linkage rod passing through the oblong hole not only drives the spring sleeve to move but also restricts the separation of the spring sleeve and the guide rod, effectively ensuring the stability of the connection between the spring sleeve and the guide rod. During the closing process of the vacuum interrupter, the spring sleeve moves, and the compression spring, the guide rod, and the moving conductive rod of the vacuum interrupter move together. After the vacuum interrupter closes, the spring sleeve continues to move. At this time, the spring sleeve moves relative to the guide rod, the compression spring is compressed, and the linkage rod slides in the oblong hole. The oblong hole allows for relative sliding while maintaining a stable connection between the spring sleeve and the guide rod. During the opening process of the vacuum interrupter, the linkage rod can apply force to the moving conductive rod of the vacuum interrupter through the guide rod, the step, the upper limit ring, the lower nut, and the upper screw during the reset process, which helps the moving conductive rod to open and reset.

[0030] When the spring sleeve and the guide rod are connected by a linkage rod, the sliding cavity also allows the spring sleeve and the guide rod to slide relative to each other, further increasing the amount that the compression spring can compress, thereby expanding the application scope of the vacuum circuit breaker of this application.

[0031] Optionally, the upper adjustment assembly further includes a locking member threadedly connected to the upper screw, the locking member abutting against the side of the adjusting nut opposite to the compression spring.

[0032] By adopting the above technical solution, after adjusting the position of the adjusting nut on the upper screw, the locking member is rotated so that it abuts against the side of the adjusting nut facing away from the compression spring, thereby restricting the adjusting nut from continuing to rotate. Compared to locking by the adjusting nut itself, the locking member further improves the stability of the adjusting nut after its position is adjusted, that is, it further ensures the stability of the compression spring after its compression is adjusted.

[0033] Optionally, the upper adjustment assembly further includes a locking elastic element that applies a force to the locking element in the direction of the adjusting nut.

[0034] By adopting the above technical solution, the locking element is subjected to force through the locking elastic element to restrict the movement of the locking element relative to the upper screw, thereby restricting the movement of the adjusting nut on the upper screw and further improving the stability after the position of the adjusting nut is adjusted.

[0035] Optionally, it also includes a lower support, and the arc-extinguishing mechanism further includes a conductive plate connected to the lower support, the conductive plate abutting against the stationary conductive rod of the vacuum arc-extinguishing chamber.

[0036] By adopting the above technical solution, compared with the adjustable vacuum circuit breaker in related technologies, by directly connecting the conductive plate to the lower bracket and adjusting the compression spring by the upper adjustment component located at the upper end of the vacuum interrupter, it is unnecessary to adjust the structure connecting the conductive plate and the lower bracket to adjust the compression of the spring. This ensures that the conductive plate always maintains good contact with the stationary conductive rod of the vacuum interrupter, avoiding the situation in related technologies where the conductive plate's contact with the conductive nut becomes loose due to adjustments in the tightening nut and conductive nut. This prevents changes in circuit resistance or temperature rise caused by loose contact between the conductive plate and the conductive nut, effectively extending the service life of the vacuum circuit breaker.

[0037] In summary, this application includes at least one of the following beneficial technical effects:

[0038] 1. The upper adjustment component that can adjust the compression of the compression spring is set on the moving conductive rod, that is, the upper adjustment component is set on the upper side of the vacuum interrupter. No other device needs to be connected here, the operating space is large, and the operating tool can be directly operated on the adjusting nut through the operating port, which effectively improves the convenience of the operator when adjusting the compression of the compression spring.

[0039] 2. By opening a waist-shaped hole on the guide rod and forming a sliding cavity with the upper limit ring and the lower nut, it is helpful to connect the guide rod and the linkage rod, improve the stability of the connection between the spring sleeve and the guide rod, and help the moving conductor rod of the vacuum interrupter to reset when the circuit is opened; on the other hand, the combination of the waist-shaped hole and the sliding cavity can effectively increase the compressibility of the compression spring and expand the application scope of the vacuum circuit breaker of this application.

[0040] 3. The conductive sheet is directly connected to the lower bracket, and the upper adjustment mechanism is located on the upper side of the vacuum interrupter. This avoids the conductive sheet from becoming loose due to the adjustment of the conductive nut and the fastening nut, so as to minimize the change in circuit resistance or temperature rise caused by the loose conductive sheet, and effectively extend the service life of the vacuum circuit breaker. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the adjustable vacuum circuit breaker in the background art.

[0042] Figure 2 This is a cross-sectional view of an adjustable vacuum circuit breaker in the background art.

[0043] Figure 3 This is a schematic diagram of the arc-extinguishing mechanism of the upper adjustable vacuum circuit breaker in the background art.

[0044] Figure 4 This is a structural schematic diagram of an embodiment of this application.

[0045] Figure 5 This is a cross-sectional view of an embodiment of this application.

[0046] Figure 6 yes Figure 5 Enlarged diagram of point A in the middle.

[0047] Explanation of reference numerals in the attached figures:

[0048] 1. Side plate; 11. Operating port; 2. Lower bracket; 3. Arc extinguishing mechanism; 31. Conductive sheet; 32. Vacuum arc extinguishing chamber; 321. Lower screw; 33. Upper adjusting assembly; 331. Upper screw; 332. Flexible connection; 333. Fixing washer; 334. Locking elastic element; 335. Locking element; 3351. Locking nut; 3352. Locking washer; 336. Adjusting nut; 3361. Lower nut; 3362. Upper limit ring; 3363. Sliding cavity; 337. Guide rod; 3 371. Step; 3372. Waist-shaped hole; 34. Upper clamping assembly; 341. Compression spring; 342. Spring sleeve; 35. Lower adjusting assembly; 351. Conductive nut; 352. Fastening nut; 4. Operating mechanism; 41. Mounting plate; 42. Operating shaft; 43. Linkage assembly; 431. Linkage frame; 432. Linkage plate; 4321. Linkage groove; 44. Linkage rod; 5. Double-acting screw; 51. Spring seat; 52. Rotary nut; 53. Spring nut; 54. Washer nut. Detailed Implementation

[0049] The following is in conjunction with the appendix Figure 4-6 This application will be described in further detail.

[0050] This application discloses a moving-end adjustable vacuum circuit breaker. (Refer to...) Figure 4 The adjustable vacuum circuit breaker includes two side plates 1 arranged opposite each other, three lower supports 2 arranged between the two side plates 1, three sets of arc extinguishing mechanisms 3 respectively arranged on different lower supports 2, and an operating mechanism 4 for transmitting force. The two ends of the lower supports 2 are respectively fixed on different side plates 1.

[0051] Reference Figure 4, Figure 5 The arc-extinguishing mechanism 3 includes a conductive plate 31, a vacuum interrupting chamber 32, an upper adjusting assembly 33, and an upper clamping assembly 34. The stationary conductive rod of the vacuum interrupting chamber 32 is fixedly connected to the lower support 2 by bolts. The conductive plate 31 is located between the stationary conductive rod of the vacuum interrupting chamber 32 and the lower support 2. The bolts that fix the stationary conductive rod of the vacuum interrupting chamber 32 to the lower support 2 pass through the conductive plate 31. The stationary conductive rod of the vacuum interrupting chamber 32 and the lower support 2 clamp the conductive plate 31 so that the stationary conductive rod of the vacuum interrupting chamber 32 and the conductive plate 31 are electrically connected.

[0052] Reference Figure 6 The upper adjustment assembly 33 includes an upper screw 331, a flexible connector 332, and a fixing washer 333. The flexible connector 332 presses against the moving conductive rod of the vacuum interrupter 32, and the fixing washer 333 presses against the side of the flexible connector 332 away from the vacuum interrupter 32. One end of the upper screw 331 passes through the flexible connector 332 and the fixing washer 333 and is threadedly connected to the moving conductive rod of the vacuum interrupter 32. The maximum diameter of the upper screw 331 is greater than the minimum diameter of the fixing washer 333, and the part of the upper screw 331 with the maximum diameter presses against the side of the fixing washer 333 away from the flexible connector 332. That is, the upper screw 331, the fixing washer 333, the flexible connector 332, and the moving conductive rod of the vacuum interrupter 32 are relatively fixed.

[0053] Reference Figure 4 , Figure 6 The upper adjusting assembly 33 also includes a locking elastic element 334, a locking element 335, an adjusting nut 336, and a guide rod 337. The locking elastic element 334 is a disc spring, fitted onto the upper screw 331. The locking element 335 consists of a locking nut 3351 and a locking washer 3352. The locking nut 3351 is threaded onto the upper screw 331, and both ends of the locking elastic element 334 abut against the locking nut 3351 and the fixing washer 333, respectively. In other embodiments, the locking elastic element 334 can also be a spring; any method that applies a force to the locking nut 3351 in the direction away from the vacuum interrupter 32 is acceptable. The locking washer 3352 is fitted onto the upper screw 331, and is located on the side of the locking nut 3351 away from the locking elastic element 334.

[0054] Reference Figure 4 , Figure 5 The adjusting nut 336 includes a lower nut 3361 and an upper limit ring 3362. The locking washer 3352 abuts against the locking nut 3351 and the lower nut 3361 on both sides. The lower nut 3361 is threaded onto the upper screw 331. Each side plate 1 has three through-hole operation ports 11. The position of the operation ports 11 corresponds to the position of the lower bracket 2. Each operation port 11 is directly opposite the adjacent lower nut 3361.

[0055] Reference Figure 6 The upper limit ring 3362 is fixed to the side of the lower nut 3361 away from the locking washer 3352, and the upper limit ring 3362 and the lower nut 3361 form a sliding cavity 3363. The guide rod 337 passes through and is rotatably mounted on the upper limit ring 3362. An annular step 3371 is integrally formed on the side wall of the guide rod 337. The end of the guide rod 337 and the step 3371 are slidably mounted in the sliding cavity 3363, and both the guide rod 337 and the step 3371 can rotate in the sliding cavity 3363. The upper limit ring 3362 is used to abut against the side of the step 3371 away from the vacuum interrupter 32.

[0056] Reference Figure 6 The upper clamping assembly 34 also includes a compression spring 341 and a spring sleeve 342. Both the compression spring 341 and the spring sleeve 342 are sleeved on the guide rod 337. The two ends of the compression spring 341 abut against the spring sleeve 342 and the upper limit ring 3362, respectively. The guide rod 337 has a through-hole 3372 that extends along the sliding direction of the moving conductive rod of the vacuum interrupter 32.

[0057] Reference Figure 4 , Figure 5 The operating mechanism 4 drives the spring sleeve 342 to move closer to the vacuum interrupter 32. The operating mechanism 4 includes a mounting plate 41, an operating shaft 42, three sets of linkage components 43, and three linkage rods 44. The mounting plate 41 is fixed on the two side plates 1. The operating shaft 42 is a hexagonal shaft and is rotatably mounted on the mounting plate 41. The three sets of linkage components 43 are respectively arranged corresponding to different interrupter mechanisms 3. The linkage components 43 include a linkage frame 431 and two linkage plates 432. The linkage frame 431 is fixed on the two side plates 1. The operating shaft 42 passes through and is rotatably mounted on the linkage frame 431. The two linkage plates 432 are located on both sides of the linkage frame 431. The operating shaft 42 passes through the linkage plates 432, and the linkage plates 432 are fixedly connected to the operating shaft 42.

[0058] Reference Figure 4 , Figure 6A linkage slot 4321 is provided on the linkage plate 432, and the distance between the two ends of the linkage slot 4321 and the axis of the operating shaft 42 is different. Each linkage rod 44 is respectively inserted into the linkage slot 4321 of the two linkage plates 432 of different linkage components 43. Two baffles are fixed on the linkage rod 44, and the two linkage plates 432 through which the linkage rod 44 passes are located between the two baffles on the linkage rod 44 to restrict the linkage rod 44 from separating from the linkage plate 432. The linkage rod 44 passes through and is rotatably mounted on the adjacent spring sleeve 342. The linkage rod 44 passes through the waist-shaped hole 3372 of the adjacent guide rod 337, and the linkage rod 44 slides in the waist-shaped hole 3372 along the extension direction of the waist-shaped hole 3372. When the linkage rod 44 moves to one end of the linkage slot 4321, the vacuum interrupter 32 closes and the compression spring 341 is compressed. When the linkage rod 44 moves to the other end of the linkage slot 4321, the vacuum interrupter 32 opens.

[0059] The implementation principle of the adjustable vacuum circuit breaker of the moving end in this application embodiment is as follows: When adjusting the compression of the compression spring 341, the operating tool is inserted between the two side plates 1 through the operating port 11 to rotate the lower nut 3361. When increasing the compression of the compression spring 341, the lower nut 3361 is rotated to move the lower nut 3361 away from the vacuum interrupter 32; conversely, when decreasing the compression of the compression spring 341, the lower nut 3361 is moved closer to the vacuum interrupter 32. Then, the locking nut 3351 is rotated to make the locking washer 3352 press against the lower nut 3361, thereby restricting the rotation of the lower nut 3361.

[0060] Compared to the adjustable vacuum interrupter and the upper adjustable vacuum interrupter in related technologies, this design greatly improves the ease of adjusting the pressure spring 341. Moreover, once the conductive plate 31 is fixed, no adjustment is required, which avoids the conductive plate 31 from becoming loose due to adjustment. This prevents changes in circuit resistance or temperature rise due to the conductive plate 31 becoming loose, thus extending the service life of the vacuum circuit breaker of this application.

[0061] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A moving-end adjustable vacuum circuit breaker, comprising a side plate (1), an arc-extinguishing mechanism (3), and an operating mechanism (4), wherein the arc-extinguishing mechanism (3) comprises a vacuum interrupting chamber (32) and an upper clamping assembly (34), the upper clamping assembly (34) comprising a compression spring (341), and the operating mechanism (4) being used to drive the end of the compression spring (341) away from the vacuum interrupting chamber (32) to move towards the vacuum interrupting chamber (32), characterized in that: The arc-extinguishing mechanism (3) further includes an upper adjustment assembly (33), which includes an upper screw (331) and an adjusting nut (336) threaded onto the upper screw (331). The upper screw (331) is connected to the moving conductive rod of the vacuum interrupting chamber (32). The end of the compression spring (341) near the vacuum interrupting chamber (32) abuts against the adjusting nut (336). An operating port (11) aligned with the adjusting nut (336) is provided on the side plate (1). The upper adjustment assembly (33) includes a guide rod (337) connected to the adjusting nut (336), and the compression spring (341) is sleeved on the guide rod (337); The adjusting nut (336) includes a lower nut (3361) threaded onto the moving conductive rod of the vacuum interrupter (32) and an upper limit ring (3362) connected to the lower nut (3361). A step (3371) is provided on the side wall of the guide rod (337), and the upper limit ring (3362) is used to abut against the side of the step (3371) away from the vacuum interrupter (32). The upper limit ring (3362) and the lower nut (3361) form a sliding cavity (3363), the end of the guide rod (337) and the step (3371) are slidably disposed in the sliding cavity (3363), and the guide rod (337) can rotate in the sliding cavity (3363); The guide rod (337) has a through-hole (3372) extending along the sliding direction of the moving conductive rod of the vacuum interrupter (32). The operating mechanism (4) includes a linkage rod (44) which passes through the through-hole (3372) of the adjacent guide rod (337).

2. The adjustable vacuum circuit breaker with moving end according to claim 1, characterized in that: The upper clamping assembly (34) also includes a spring sleeve (342), which abuts against the end of the compression spring (341) away from the vacuum interrupter (32), and the operating mechanism (4) is used to drive the spring sleeve (342) to move toward the vacuum interrupter (32).

3. A moving-end adjustable vacuum circuit breaker according to claim 2, characterized in that: The spring sleeve (342) is fitted onto the guide rod (337).

4. A moving-end adjustable vacuum circuit breaker according to claim 3, characterized in that: The linkage rod (44) is connected to the spring sleeve (342), and the linkage rod (44) is slidably disposed in the waist-shaped hole (3372) along the extension direction of the waist-shaped hole (3372). The linkage rod (44) can slide along the sliding direction of the moving conductive rod of the vacuum interrupter (32).

5. A moving-end adjustable vacuum circuit breaker according to claim 1, characterized in that: The upper adjustment assembly (33) also includes a locking member (335) threaded onto the upper screw (331), the locking member (335) abutting against the side of the adjusting nut (336) opposite to the compression spring (341).

6. A moving-end adjustable vacuum circuit breaker according to claim 5, characterized in that: The upper adjustment assembly (33) further includes a locking elastic element (334) that applies a force to the locking element (335) toward the adjusting nut (336).

7. A moving-end adjustable vacuum circuit breaker according to claim 1, characterized in that: It also includes a lower support (2), and the arc extinguishing mechanism (3) further includes a conductive sheet (31) connected to the lower support (2), the conductive sheet (31) abutting against the stationary conductive rod of the vacuum arc extinguishing chamber (32).

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