Circuit breaker with interphase insulation structure

Abstract

The utility model relates to a circuit breaker with an interphase insulation structure, which comprises a base internally provided with a mounting groove, a plurality of interphase partition plates arranged in the mounting groove in parallel at intervals, a rotating shaft and an insulation spacer, and the plurality of interphase partition plates divide the mounting groove into a plurality of moving and static contact mounting grooves; a moving contact and a static contact bridge are arranged in the moving and static contact mounting groove; u-shaped holes are formed in the interphase partition plates; the rotating shaft passes through the plurality of U-shaped holes and is in transmission connection with the plurality of moving contacts. And the insulating spacer is arranged on the rotating shaft and is in clearance arrangement with the alternate partition plate at the U-shaped hole. Compared with the prior art, aiming at the problem that the concave-convex embedded structure between the rotating shaft and the base has minimum width limitation in the prior art, the insulating spacer is arranged on the rotating shaft at the inner side of the two phases, so that a smaller phase distance can be used, and the width and the volume of the product are further reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of circuit breakers and relates to a circuit breaker with an interphase insulation structure. Background Art

[0002] In some systems with relatively high rated voltages, such as molded case circuit breakers, the interphase insulation requirements are relatively high. With the trend towards miniaturization, the interphase spacing is generally not very large. To enhance interphase insulation, most existing products use a flange protruding between the two phases of the rotating shaft, combined with a groove cut into the U-shaped hole of the base to form an interleaved embedded structure to achieve the purpose of enhancing interphase insulation. Alternatively, a baffle is added between the two phases. However, these methods require a minimum width of the ribs between the two phases of the base, resulting in a larger interphase spacing and high dimensional accuracy requirements for the mating structure. Another method is to add a baffle between the two phases, but this method is complex to assemble, requires high component precision, and also requires a larger interphase spacing. Utility Model Content

[0003] The purpose of the utility model is to provide a circuit breaker with a phase-to-phase insulation structure that is simple in structure and easy to process and assemble, which can reduce the phase spacing while ensuring enhanced insulation capacity, so that the volume of the product can be smaller.

[0004] The purpose of the utility model can be achieved through the following technical solutions:

[0005] A circuit breaker with a phase-to-phase insulation structure, comprising:

[0006] A base with a mounting slot therein;

[0007] A plurality of interphase separators are arranged in parallel and spaced apart in the mounting groove, and divide the mounting groove into a plurality of movable and static contact mounting grooves; the movable and static contact mounting grooves are provided with movable contacts and static contact bridges; and a U-shaped hole is opened on the interphase separator.

[0008] A rotating shaft passes through the plurality of U-shaped holes and is transmission-connected to the plurality of moving contacts; and

[0009] The insulating spacer is arranged on the rotating shaft and is provided with a gap between the phase separation plates at the U-shaped hole.

[0010] Furthermore, the rotating shaft includes a plurality of coaxially rotatably connected movable contact seats, a movable contact rotating shaft and a spring positioning shaft arranged in parallel in the movable contact seats, and a torsion spring sleeved on the movable contact rotating shaft;

[0011] The movable contact seat comprises a torsion spring baffle and a movable contact baffle arranged in parallel and at intervals;

[0012] The movable contact is provided with a rotating shaft through-hole for the movable contact rotating shaft to pass through, and swings between the torsion spring baffle and the movable contact baffle. One end of the movable contact is provided with a movable contact point, and the other end is overlapped on one side of the spring positioning shaft;

[0013] One active end of the torsion spring abuts against the other side of the spring positioning shaft, and the other active end abuts against the torsion spring baffle, so as to rotate the moving contact around the moving contact rotation axis until it abuts against the moving contact baffle through elastic restoring force.

[0014] Furthermore, a U-shaped groove is provided on one end of the moving contact away from the moving contact point, and the moving contact is overlapped on the spring positioning shaft through the U-shaped groove.

[0015] Furthermore, one end of the moving contact away from the moving contact point is also connected to a soft connection.

[0016] Furthermore, the torsion spring is a double torsion spring, the bent middle convex portion serves as an active end abutting against the spring positioning shaft, and the two ends serve as active ends abutting against the torsion spring baffle.

[0017] Furthermore, the movable contact seats are connected via connecting columns, and the insulating spacers are arranged on the connecting columns.

[0018] Furthermore, the connecting column is loosely fitted with the U-shaped hole.

[0019] Furthermore, the insulating spacer is larger than the moving contact seat.

[0020] Furthermore, the insulating spacer is a disc.

[0021] Furthermore, the circuit breaker also includes a transmission mechanism for driving the rotating shaft to rotate, the transmission mechanism is arranged on the upper side of the moving and static contact mounting grooves, and includes partitions arranged on both sides, and the tops of the two side edges of the partitions are respectively provided with outwardly extending clamping plates, and the tops of the outer side surfaces of the U-shaped holes on both sides of the moving and static contact mounting grooves are provided with clearance steps adapted to the clamping plates.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1) The concave-convex embedded structure between the rotating shaft and the base in the prior art has a minimum width restriction. To address this problem, the present invention provides insulating spacers on the rotating shafts on the inner sides of the two phases. These spacers are not affected by the above minimum width restriction and can use a smaller phase spacing, thereby reducing the width and volume of the product.

[0024] 2) The utility model has better insulation protection effect at the rotating shaft and better anti-aging effect than the existing solution, thereby increasing the reliability and life of the product.

[0025] 3) The utility model uses fewer parts, has a simple structure, is easy to assemble, reduces the precision requirements for related parts, and is conducive to cost control. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the structure of a circuit breaker with a phase-to-phase insulation structure (only the transmission mechanism, rotating shaft, and moving contact are shown);

[0027] Figure 2 This is a schematic structural diagram of a circuit breaker with a phase-to-phase insulation structure in a closed state (only the transmission mechanism and rotating shaft, moving contact, and base are shown);

[0028] Figure 3 、 Figure 4 Schematic diagram of the assembly of a circuit breaker with a phase-to-phase insulation structure (only the transmission mechanism, rotating shaft, moving contact, and base are shown);

[0029] Figure 5 is a structural diagram of the rotating shaft;

[0030] Figure 6 It is a structural diagram of the moving contact;

[0031] Figure 7 is a structural diagram of the base;

[0032] Figure 8 This is a schematic diagram of the assembly of the partition and the steps;

[0033] Figure 9 This is a partial enlarged view of the assembly point between the partition and the step;

[0034] Figure 10 This is a schematic diagram of the assembly of a circuit breaker with a phase-to-phase insulation structure (only the rotating shaft, moving contact, and base are shown);

[0035] Figure 11 This is a structural schematic diagram of a rotating shaft device of a circuit breaker;

[0036] Description of the marks in the figure:

[0037] 1. Rotating shaft, 101. Insulating spacer, 102. Torsion spring baffle, 103. Moving contact baffle; 2. Spring positioning shaft; 3. Flexible connection; 4. Torsion spring; 5. Base, 501. U-shaped hole, 502. Step; 6. Partition; 7. Moving contact, 701. U-shaped hole, 702. Rotating shaft through hole; 8. Side plate; 9. Moving contact rotating shaft. DETAILED DESCRIPTION

[0038] The following embodiments are implemented based on the above technical solution of the present invention, and provide detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to the following embodiments.

[0039] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not require further definition or explanation in subsequent drawings.

[0040] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0041] Example:

[0042] With the changes in market demand, especially the rapid growth of the new energy market and the demand for increased rated voltage of the distribution system, the rated voltage design parameters of many distribution products are getting higher and higher, and the phase-to-phase insulation problem is becoming increasingly prominent. In this embodiment, a phase-to-phase insulation structure at the shaft of a transmission mechanism is used to strengthen the phase-to-phase insulation problem at the shaft and improve the reliability and life of the product.

[0043] like Figure 2 、 Figure 3 The circuit breaker shown has a phase-to-phase insulation structure and includes a base 5 with an internal mounting slot, a phase-to-phase separator plate, a rotating shaft 1, an insulating spacer 101, and a static contact, among other common circuit breaker structures. Two phase-to-phase separator plates are spaced parallel to each other within the mounting slots, dividing the slots into a mounting slot for the moving and static contacts of phase A, a mounting slot for the moving and static contacts of phase B, and a mounting slot for the moving and static contacts of phase C. The moving and static contact mounting slots contain moving contacts 7 and a static contact bridge. U-shaped holes 501 are defined on the phase-to-phase separator plates. The rotating shaft 1 passes through multiple U-shaped holes 501 and is in transmission connection with three moving contacts 7. The insulating spacer 101 is positioned on the rotating shaft 1 and is spaced apart from the phase-to-phase separator plates at the U-shaped holes 501. The insulating spacer 101 is integrated into the structure of phases A and C, resulting in a simple, compact, and high-strength structure. The insulating spacer 101 increases the creepage distance between phases along the rotating shaft 1, thereby enhancing the phase-to-phase insulation at the rotating shaft.

[0044] The rotating shaft 1 includes a plurality of coaxially rotatably connected moving contact seats, a moving contact rotating shaft 9 and a spring positioning shaft 2 arranged in parallel in the moving contact seat, and a torsion spring 4 sleeved on the moving contact rotating shaft 9; the moving contact seat includes a torsion spring baffle 102 and a moving contact baffle 103 arranged in parallel and spaced apart; the moving contact 7 is provided with a rotating shaft through hole 702 for the moving contact rotating shaft 9 to pass through, and swings between the torsion spring baffle 102 and the moving contact baffle 103, one end of the moving contact 7 is provided with a moving contact point, and the other end is overlapped on one side of the spring positioning shaft 2; one active end of the torsion spring 4 abuts against the other side of the spring positioning shaft 2, and the other active end abuts against the torsion spring baffle 102, so as to rotate the moving contact 7 around the moving contact rotating shaft 9 until it abuts against the moving contact baffle 103 through elastic restoring force.

[0045] In some specific embodiments, a U-shaped groove 701 is provided on the end of the movable contact 7 away from the movable contact point, and the movable contact 7 is overlapped on the spring positioning shaft 2 through the U-shaped groove 701. More preferably, the spring positioning shaft 2 is embedded in the U-shaped groove 701 so that the rotational action of the torsion spring 4 can be better transmitted to the movable contact 7.

[0046] In some specific embodiments, the end of the moving contact 7 away from the moving contact point is further connected to a flexible connection 3 .

[0047] In some specific embodiments, the torsion spring 4 is a double torsion spring, with the bent middle convex portion as the active end abutting against the spring positioning shaft 2, and the two ends as the active ends abutting against the torsion spring baffle 102. The double torsion spring is used to enhance the balance of the force acting on the moving contact seat.

[0048] In some specific embodiments, the moving contact seats are connected via connecting columns, and the insulating spacers 101 are provided on the connecting columns.

[0049] In some specific embodiments, the connecting post and the U-shaped hole 501 are loosely fitted.

[0050] In some specific embodiments, the insulating spacer 101 is larger than the movable contact seat. More preferably, the insulating spacer 101 is a circular piece.

[0051] In some specific embodiments, the circuit breaker also includes a transmission mechanism for driving the rotating shaft 1 to rotate. The transmission mechanism structure can be referred to CN116031111A, which is arranged on the upper side of the movable and static contact mounting slots and includes side plates 8 and partitions 6 arranged on both sides, which are used to separate the transmission structure in the transmission mechanism from other structures of the circuit breaker, wherein the partition 6 is arranged on the outside of the side plate 8 and the top of the two sides of the partition 6 also extends outward with a clamping plate, and the top of the outer side of the U-shaped hole 501 on both sides of the movable and static contact mounting slots is provided with a clearance step 502 adapted to the clamping plate. The partition 6 of the transmission mechanism is placed in the U-shaped hole 501 on the base and falls on the step 502, with one side attached to the base 5 and the other side attached to the side plate 8, as shown in FIG. Figure 4 、 Figure 8 、 Figure 9 shown.

[0052] Working principle:

[0053] The creepage distance between two adjacent phase conductive systems of the circuit breaker at the rotating shaft 1 is relatively close. This is a weak point in the phase-to-phase insulation. The principle is explained using phases B and C as an example. The situation between the other two phases is similar.

[0054] like Figure 2As shown, in the closed state, the creepage distance path is shown by the dotted line in the figure, starting from the spring positioning shaft 2 of phase B, passing through the U-shaped hole 501 along the surface of the rotating shaft 1, and then bypassing the insulating spacer 101 to reach the spring positioning shaft 2 of phase C. Compared with the case without the insulating spacer 101, the creepage distance is greatly increased and is not less than the creepage distance of the prior art. According to this structure, the creepage distance and electrical clearance from the remaining C-phase charged body to the B-phase charged body are also greatly enhanced.

[0055] like Figure 3 As shown, when the fault current is interrupted, the moving contact 7 is repelled and the spring positioning shaft 2 moves therewith. Its creepage distance path starts from the spring positioning shaft 2 of phase B, passes through the U-shaped hole 501 along the surface of the rotating shaft 1, and then bypasses the insulating spacer 101 to reach the spring positioning shaft 2 of phase C. Compared with the case without the insulating spacer 101, the creepage distance is greatly increased, which is not less than the creepage distance of the prior art. According to this structure, the creepage distance and electrical clearance from the remaining C-phase charged body to the B-phase charged body are also greatly enhanced.

[0056] Combine Figure 1 、 Figure 2 、 Figure 3 It can be seen that the insulating spacer 101 completely separates the entire C-phase metal charged body from the B-phase and the metal parts of the mechanism, achieving 360-degree protection without dead angles and improving the interphase insulation capacity. Figure 10 The figure shows an existing technical solution, in which a flange is protruded between the two-phase structure of the rotating shaft, and a groove is opened on the U-shaped hole of the base to form a staggered embedded structure to achieve the purpose of enhancing the insulation capacity between phases. However, the features of this solution require axial clearance fit, which has requirements for part precision and structural strength, and takes up more space. In comparison, this structure eliminates the protruding flange between the two-phase structure of the rotating shaft, simplifies the corresponding U-shaped hole groove and partition step features of the base; because there are no more redundant features in the middle position between the two phases, the circuit breaker can appropriately reduce the phase spacing, while reducing the fitting dimensions between the rotating shaft and the base, reducing the precision requirements for parts and assembly, and controlling costs. Figure 11 The technical solution shown is to assemble a baffle at the rotating shaft, which not only requires a large phase spacing, but also has many parts, high manufacturing and assembly precision requirements, and complicated assembly.

[0057] Grease is usually applied to the contact point between the rotating shaft and the base to ensure smooth movement of the mechanism. Under the pressure of the long-term rated voltage of the electrical appliance and the effect of the internal working temperature rise, the grease ages faster and the dielectric capacity decreases, resulting in deterioration of phase-to-phase insulation. The higher the rated voltage and the higher the temperature rise, the more obvious the deterioration. In the prior art, grease is present at the flange where the phase-to-phase insulation is added, so the phase-to-phase insulation is greatly affected by the aging of the grease. In this solution, grease is not applied to the structure where the insulation is added, so the impact is relatively small. Compared with the prior art, the reliability and life of the product can be improved.

[0058] The above description of the embodiments is intended to facilitate understanding and use of the utility model by those skilled in the art. Those skilled in the art will readily be able to make various modifications to these embodiments and apply the general principles described herein to other embodiments without requiring inventive effort. Therefore, the utility model is not limited to the above-described embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of this utility model without departing from the scope of this utility model should be within the scope of protection of this utility model.

Claims

1. A circuit breaker with a phase-to-phase insulation structure, characterized in that: include: A base (5) having a mounting groove therein; A plurality of interphase partition plates are arranged in parallel and spaced apart in the mounting groove, and divide the mounting groove into a plurality of movable and static contact mounting grooves; a movable contact (7) and a static contact bridge are arranged in the movable and static contact mounting grooves; a U-shaped hole (501) is opened on the interphase partition plate; The rotating shaft (1) passes through a plurality of U-shaped holes (501) and is transmission-connected to a plurality of moving contacts; and the insulating spacer (101) is provided on the rotating shaft (1) and is provided with a gap between the phase separation plates at the U-shaped holes (501).

2. The circuit breaker with a phase-to-phase insulation structure according to claim 1, characterized in that: The rotating shaft (1) comprises a plurality of coaxially rotatably connected movable contact seats, a movable contact rotating shaft (9) and a spring positioning shaft (2) arranged in parallel in the movable contact seats, and a torsion spring (4) sleeved on the movable contact rotating shaft (9); The movable contact seat comprises a torsion spring baffle (102) and a movable contact baffle (103) arranged in parallel and spaced apart; The movable contact (7) is provided with a rotating shaft through hole (702) for the movable contact rotating shaft (9) to pass through, and swings between the torsion spring baffle (102) and the movable contact baffle (103); one end of the movable contact (7) is provided with a movable contact point, and the other end is overlapped on one side of the spring positioning shaft (2); One active end of the torsion spring (4) abuts against the other side of the spring positioning shaft (2), and the other active end abuts against the torsion spring baffle (102), so as to rotate the moving contact (7) around the moving contact rotating shaft (9) through elastic restoring force until it abuts against the moving contact baffle (103).

3. The circuit breaker with a phase-to-phase insulation structure according to claim 2, wherein: A U-shaped groove (701) is provided on one end of the moving contact (7) away from the moving contact point, and is overlapped on the spring positioning shaft (2) through the U-shaped groove (701).

4. The circuit breaker with a phase-to-phase insulation structure according to claim 3, wherein: An end of the moving contact (7) away from the moving contact point is also connected to a soft connection (3).

5. The circuit breaker with a phase-to-phase insulation structure according to claim 2, wherein: The torsion spring (4) is a double torsion spring, the bent middle convex portion abuts against the spring positioning shaft (2) as an active end, and the two ends abut against the torsion spring baffle (102) as active ends respectively.

6. The circuit breaker with a phase-to-phase insulation structure according to claim 2, wherein: The movable contact seats are connected via connecting columns, and the insulating spacers (101) are arranged on the connecting columns.

7. The circuit breaker with a phase-to-phase insulation structure according to claim 6, wherein: The connecting column is clearance-matched with the U-shaped hole (501).

8. The circuit breaker with a phase-to-phase insulation structure according to claim 2, wherein: The insulating spacer (101) is larger than the moving contact seat.

9. The circuit breaker with a phase-to-phase insulation structure according to claim 1, wherein: The insulating spacer (101) is a circular piece.

10. The circuit breaker with a phase-to-phase insulation structure according to claim 1, wherein: The circuit breaker further comprises a transmission mechanism for driving the rotating shaft (1) to rotate, the transmission mechanism being arranged on the upper side of the movable and static contact mounting slots and comprising partitions (6) arranged on both sides, the tops of both side edges of the partitions (6) being respectively provided with outwardly extending clamping plates, and the tops of the outer side surfaces of the U-shaped holes (501) on both sides of the movable and static contact mounting slots being provided with clearance steps (502) adapted to the clamping plates.

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