A three-position vacuum circuit breaker

Abstract

The utility model discloses a three position vacuum circuit breaker, including fixed base frame, the fixed base frame bottom is fixedly installed with support seat through fastener, the support seat is opened with the adjusting cavity in, the sliding block is movably connected in the adjusting cavity, the movable contact assembly is rotatively connected with the adjusting block top, the adjusting cavity is fixedly connected with the guide plate in symmetry, the guide opening is opened with the guide plate opposite position on the adjusting block bottom surface, and the guide opening inner wall is movably connected with the guide plate outer wall, the balancing block is connected with two guide plates between the adjusting block bottom, and the balancing block surface is movably connected with two guide plate outer walls. The utility model discloses through setting up the adjusting cavity in the support seat, and cooperate the collaborative design of adjusting block, guide plate, balancing block and special shape fixed hole, give the movable contact assembly with the stable horizontal adjustment ability, thereby effectively solved the problem of background art.

Description

Technical Field

[0001] This utility model relates to the field of vacuum circuit breaker technology, specifically a three-position vacuum circuit breaker. Background Technology

[0002] A three-position vacuum circuit breaker is an indispensable piece of equipment in a high-voltage switchgear. It is an electrical device that integrates a disconnecting switch, a vacuum circuit breaker, and a grounding switch. A zero-sequence current transformer is also installed in the high-voltage switchgear. The zero-sequence current transformer is used to monitor and measure the zero-sequence current. When the high-voltage switchgear generates a zero-sequence grounding current, it is used in conjunction with relay protection devices or signals to make the device components operate, thereby achieving protection and improving safety.

[0003] Currently used three-position vacuum circuit breakers do not integrate lateral adjustment functionality into their moving contact assembly design. During long-term operation, this assembly is prone to gradual positional deviation due to mechanical wear, vibration, and impact. This deviation directly leads to misalignment between the moving contact and the stationary contacts on the upper and lower sides, disrupting their original precise fit and ultimately negatively impacting contact performance. This can result in increased contact resistance, decreased conductivity, and other problems, affecting the overall operational stability of the circuit breaker. Summary of the Invention

[0004] The purpose of this invention is to provide a three-position vacuum circuit breaker to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a three-position vacuum circuit breaker, comprising a fixed base frame, a support seat fixedly installed at the bottom of the fixed base frame by fasteners, an adjustment cavity opened in the support seat, a sliding block movably connected in the adjustment cavity, a moving contact assembly rotatably connected to the top of the adjustment block, guide plates symmetrically fixedly connected in the adjustment cavity, a guide opening opened on the bottom surface of the adjustment block at a position opposite to the guide plates, and the inner wall of the guide opening movably connected to the outer wall of the guide plates, and a balance block connected between the bottom of the adjustment block and the two guide plates, and the surface of the balance block movably connected to the outer walls of the two guide plates.

[0006] Preferably, the bottom of the inner wall of the adjustment cavity is provided with an irregularly shaped fixing hole between the two guide plates, and the bottom surface of the adjustment block is threaded with fastening bolts that cooperate with the irregularly shaped fixing hole for fixing.

[0007] Preferably, a rotating shaft is rotatably connected within the fixed base frame, located obliquely behind the moving contact assembly. A rotating arm is sleeved on the surface of the rotating shaft at a position opposite to the moving contact assembly, and the end of the rotating arm away from the rotating shaft is connected to the moving contact assembly.

[0008] Preferably, the rotating arm has a sleeve hole that fits the outer wall of the rotating shaft at one end near the rotating shaft, and the inner wall of the sleeve hole fits against the outer wall of the rotating shaft. The outer wall of the rotating arm has a threaded hole at the rear, and a locking member for fixing the rotating arm is threaded into the threaded hole. The bottom surface of the locking member is in contact with the outer wall of the rotating shaft.

[0009] Preferably, the moving contact assembly includes a first contact piece, a second contact piece, and a connecting plate. The first contact piece and the second contact piece are arranged side by side, and the connecting plate is fixedly connected between the first contact piece and the second contact piece. The top of the connecting plate is connected to the rotating arm.

[0010] Preferably, an upper stationary head is fixedly installed inside the fixed base frame directly above the moving contact assembly, a support frame is fixedly connected to the front end of the fixed base frame, and a lower stationary head is installed on the support frame at a position opposite to the moving contact assembly.

[0011] Preferably, the outer walls of the upper and lower stationary heads are in contact with the inner walls of the first and second contact plates. Beneficial effects

[0012] Compared with existing technologies, the beneficial effects of this utility model are as follows: This invention addresses the deficiency of existing three-position vacuum circuit breaker moving contact assemblies lacking lateral adjustment functionality. By incorporating an adjustment cavity within the support base, along with a coordinated design of an adjustment block, guide plate, balance block, and irregularly shaped fixing holes, a stable lateral adjustment capability is provided for the moving contact assembly. When positional deviations occur due to mechanical wear, vibration, or impact during long-term operation, the adjusting block can be moved laterally along the guide plate by loosening the fastening bolts. Simultaneously, the balance block slides against the guide plate to prevent misalignment until the moving contact assembly re-aligns precisely with the upper and lower stationary heads. The position is then locked by the engagement of the fastening bolts and the irregularly shaped fixing holes. This design not only actively corrects deviations but also ensures stability during adjustment through the limiting effect of the guide plate, completely resolving the problem of misalignment-induced contact failure in traditional moving contacts and fundamentally preventing contact failures caused by misalignment. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the cooperation structure between the support base and the adjusting block of this utility model; Figure 3 This is a schematic diagram of the support structure of this utility model; Figure 4 This is a schematic diagram of the cooperation structure between the adjusting block and the moving contact assembly of this utility model; Figure 5 This is an enlarged structural diagram of point A of this utility model.

[0014] The correspondence between the labels and component names in the attached figures is as follows: 1. Fixed base frame; 2. Support base; 3. Rotating shaft; 4. Rotating arm; 5. Moving contact assembly; 6. Support frame; 7. Lower stationary head; 8. Upper stationary head; 9. Adjusting block; 21. Adjusting cavity; 22. Guide plate; 23. Irregularly shaped fixing hole; 41. Socket hole; 42. Threaded hole; 43. Locking element; 51. First contact piece; 52. Second contact piece; 53. Connecting plate; 91. Guide opening; 92. Fastening bolt; 93. Balance block. Detailed Implementation

[0015] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0016] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "front," "rear," "inner," "outer," "vertical," and "horizontal," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0017] like Figures 1-5 This is a schematic diagram of a preferred embodiment of the present invention of a three-position vacuum circuit breaker. In this embodiment, a three-position vacuum circuit breaker includes a fixed base frame 1, which serves as the installation foundation for the entire device. A support base 2 is fixedly installed at its bottom by fasteners. The support base 2 is used to support the moving contact assembly 5 and provide adjustment space. An adjustment cavity 21 is provided in the support base 2. The adjustment cavity 21 is a rectangular cavity structure, and an adjustment block 9 is movably connected inside. The top of the adjustment block 9 is rotatably connected to the moving contact assembly 5 by a pin, so that the moving contact assembly 5 can rotate around the top of the adjustment block 9 to meet the opening and closing operation requirements of the circuit breaker. To ensure the stability of the adjusting block 9 during lateral movement, two guide plates 22 are symmetrically fixedly connected inside the adjusting cavity 21. The guide plates 22 are long strip-shaped metal plates arranged along the length of the adjusting cavity 21. A guide opening 91 is provided on the bottom surface of the adjusting block 9 at the relative position of the guide plates 22. The shape of the guide opening 91 is adapted to the guide plate 22, and the inner wall of the guide opening 91 is in close contact with the outer wall of the guide plate 22 and can slide along the length of the guide plate 22 to realize the lateral guidance of the adjusting block 9. Meanwhile, a balance block 93 is fixedly connected to the bottom of the adjusting block 9 between the two guide plates 22. The balance block 93 is a circular block, and its two side surfaces are in close contact with the outer walls of the two guide plates 22 and can slide synchronously. The setting of the balance block 93 can prevent the adjusting block 9 from tilting or deviating when moving laterally, and further improve the adjustment stability. In this embodiment, to achieve position locking of the adjusting block 9 after adjustment, an irregularly shaped fixing hole 23 is provided at the bottom of the inner wall of the adjusting cavity 21 between the two guide plates 22. The irregularly shaped fixing hole 23 is an elongated hole structure that extends along the length of the guide plate 22. Fastening bolts 92 are threadedly connected to both sides of the balance block 93 on the bottom surface of the adjusting block 9. The size of the fastening bolts 92 is adapted to the irregularly shaped fixing hole 23. When the adjusting block 9 moves to the target position, the fastening bolts 92 are tightened so that its bottom is in close contact with the inner wall of the irregularly shaped fixing hole 23, thereby fixing the position of the adjusting block 9. In this embodiment, to drive the moving contact assembly 5 to perform opening and closing actions, a rotating shaft 3 is rotatably connected to the moving contact assembly 5 via a bearing inside the fixed base frame 1, located diagonally behind the moving contact assembly 5. The rotating shaft 3 can be driven to rotate by an external drive mechanism, which is existing technology and will not be described in detail here. A rotating arm 4 is sleeved on the surface of the rotating shaft 3 at a position relative to the moving contact assembly 5. The end of the rotating arm 4 away from the rotating shaft 3 is connected to the moving contact assembly 5 via a pin. When the rotating shaft 3 rotates, it can drive the rotating arm 4 to swing, thereby driving the moving contact assembly 5 to rotate around the top of the adjusting block 9, so as to achieve docking or separation with the upper and lower stationary contacts.

[0018] In this embodiment, to ensure the reliability of the connection between the rotating arm 4 and the rotating shaft 3, a sleeve hole 41 is provided at one end of the rotating arm 4 near the rotating shaft 3. The inner wall of the sleeve hole 41 is tightly fitted with the outer wall of the rotating shaft 3 to prevent relative wobbling between the two. A threaded hole 42 is provided at the rear of the outer wall of the rotating arm 4. A locking member 43 is threaded into the threaded hole 42. The locking member 43 is a set screw. The bottom surface of the locking member 43 is in close contact with the outer wall of the rotating shaft 3. By tightening the locking member 43, the relative position of the rotating arm 4 and the rotating shaft 3 can be further fixed to prevent loosening after long-term operation. In this embodiment, the moving contact assembly 5 adopts a double contact plate structure, including a first contact plate 51, a second contact plate 52, and a connecting plate 53. The first contact plate 51 and the second contact plate 52 are arranged side by side and in parallel. Both are arc-shaped metal plates adapted to the shape of the stationary contact, and the material is a copper alloy with high conductivity. The first contact plate 51 and the second contact plate 52 are fixedly connected by welding to the connecting plate 53. The connecting plate 53 is a triangular metal plate, and its top is connected to the rotating arm 4 through a pin to realize the linkage between the moving contact assembly 5 and the rotating arm 4. In this embodiment, to realize the switching function of the circuit breaker, an upper stationary head 8 is fixedly installed in the fixed base frame 1 directly above the moving contact assembly 5 by bolts. A support frame 6 is fixedly connected to the front end of the surface of the fixed base frame 1 by welding. The support frame 6 is an L-shaped metal frame, and a lower stationary head 7 is installed on its top at the relative position of the moving contact assembly 5 by bolts. The outer walls of the upper stationary head 8 and the lower stationary head 7 are in close contact with the inner walls of the first contact piece 51 and the second contact piece 52. When the moving contact assembly 5 rotates, the first contact piece 51 and the second contact piece 52 can contact the upper stationary head 8 or the lower stationary head 7 to ensure the stability of conductivity.

[0019] The above description, in conjunction with specific embodiments, provides a further detailed explanation of the present utility model. It should not be construed that the specific implementation of the present utility model is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present utility model, and all such deductions or substitutions should be considered to fall within the scope of protection defined by the claims submitted by the present utility model.

Claims

1. A three-position vacuum circuit breaker, comprising a fixed base frame (1), characterized in that: The bottom of the fixed base frame (1) is fixedly installed with a support base (2) by fasteners. An adjustment cavity (21) is opened in the support base (2). An adjustment block (9) is movably connected in the adjustment cavity (21). A moving contact assembly (5) is rotatably connected to the top of the adjustment block (9). A guide plate (22) is symmetrically fixed in the adjustment cavity (21). A guide opening (91) is opened on the bottom surface of the adjustment block (9) at the opposite position of the guide plate (22). The inner wall of the guide opening (91) is movably connected to the outer wall of the guide plate (22). A balance block (93) is connected between the two guide plates (22) at the bottom of the adjustment block (9). The surface of the balance block (93) is movably connected to the outer wall of the two guide plates (22).

2. The three-position vacuum circuit breaker according to claim 1, characterized in that: The bottom of the inner wall of the adjustment cavity (21) is provided with an irregularly shaped fixing hole (23) between the two guide plates (22), and the bottom surface of the adjustment block (9) is connected to the two sides of the balance block (93) with fastening bolts (92) that cooperate with and fix the irregularly shaped fixing hole (23).

3. The three-position vacuum circuit breaker according to claim 1, characterized in that: The fixed base frame (1) is rotatably connected to the rotating shaft (3) located obliquely behind the moving contact assembly (5). The rotating shaft (3) is fitted with a rotating arm (4) at a position opposite to the moving contact assembly (5). The end of the rotating arm (4) away from the rotating shaft (3) is connected to the moving contact assembly (5).

4. A three-position vacuum circuit breaker according to claim 3, characterized in that: The rotating arm (4) has a sleeve hole (41) that fits the outer wall of the rotating shaft (3) at one end near the rotating shaft (3), and the inner wall of the sleeve hole (41) is in contact with the outer wall of the rotating shaft (3). The rotating arm (4) has a threaded hole (42) at the rear of the outer wall, and a locking member (43) for fixing the rotating arm (4) is threaded in the threaded hole (42). The bottom surface of the locking member (43) is in contact with the outer wall of the rotating shaft (3).

5. A three-position vacuum circuit breaker according to claim 3, characterized in that: The moving contact assembly (5) includes a first contact piece (51), a second contact piece (52) and a connecting plate (53). The first contact piece (51) and the second contact piece (52) are arranged side by side. The connecting plate (53) is fixedly connected between the first contact piece (51) and the second contact piece (52). The top of the connecting plate (53) is connected to the rotating arm (4).

6. A three-position vacuum circuit breaker according to claim 3, characterized in that: An upper stationary head (8) is fixedly installed inside the fixed base frame (1) directly above the moving contact assembly (5). A support frame (6) is fixedly connected to the front end of the surface of the fixed base frame (1). A lower stationary head (7) is installed on the support frame (6) at a position opposite to the moving contact assembly (5).

7. A three-position vacuum circuit breaker according to claim 6, characterized in that: The outer walls of the upper stationary head (8) and the lower stationary head (7) are in contact with the inner walls of the first contact piece (51) and the second contact piece (52).

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