Limiting structure of circuit breaker and circuit breaker with limiting structure

Abstract

The utility model relates to the technical field of circuit breakers, in particular to a limiting structure of a circuit breaker and the circuit breaker with the limiting structure. A rotating shaft is included. The crank arm is provided with a first connecting hole and a second connecting hole which are oppositely arranged, the rotating shaft penetrates through the first connecting hole and can drive the crank arm to rotate, and the connecting line between the center of the first connecting hole and the center of the second connecting hole is a first straight line; the first connecting piece is provided with a third connecting hole and a fourth connecting hole which are oppositely arranged, the connecting line between the center of the third connecting hole and the center of the fourth connecting hole is a second straight line, and the first connecting piece is rotationally connected to the crank arm; the second connecting piece is rotationally connected to the first connecting piece; the second connecting piece is rotationally connected to the frame; and a blocking part is formed on the first connecting piece to prevent the first straight line and the second straight line from being collinear after the rotating shaft drives the connecting lever to continuously rotate. The limiting structure has the advantages of simple structure, accurate limiting, high reliability and the like.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, and in particular to a limiting structure for a circuit breaker and a circuit breaker having the same. Background Technology

[0002] Circuit breakers are important devices in power systems used for the protection and control of circuits. They are mainly used to connect, carry, and disconnect current under normal or fault conditions. When a circuit breaker performs a closing operation, the energy storage mechanism drives a four-bar linkage to move the moving contact from the position away from the stationary contact to the position where it is engaged with the stationary contact.

[0003] During circuit breaker closing, the four-bar linkage may fail to operate due to reaching a dead position. The commonly used solution is to install limit blocks or other limiting devices on the circuit breaker frame using bolts. However, this traditional design has significant limitations: firstly, its structure is complex, involving a large number of parts; secondly, due to differences in the machining precision and assembly processes of the parts, the limit devices often require repeated adjustments to achieve the ideal position; more importantly, during long-term operation, the limit blocks may become displaced and loose due to mechanical vibration or operational impact, ultimately leading to the failure of the limit function. These problems not only reduce equipment reliability but also increase maintenance costs.

[0004] In view of the possibility that the existing four-bar linkage mechanism of the circuit breaker may fail to operate due to the dead point during the closing process, there is an urgent need to propose a limit structure to effectively prevent the four-bar linkage mechanism from passing through the dead point position, thereby improving the reliability and stability of the product operation. Utility Model Content

[0005] Therefore, the purpose of this utility model is to propose a circuit breaker limiting structure to prevent the four-bar linkage from passing through the dead point position, so as to improve the reliability and stability of product operation.

[0006] This utility model provides a limiting structure for a circuit breaker, comprising: a rotating shaft; a crank arm having a first connecting hole and a second connecting hole arranged opposite to each other, the rotating shaft passing through the first connecting hole and capable of driving the crank arm to rotate, the line connecting the center of the first connecting hole and the center of the second connecting hole being a first straight line; a first connecting member having a third connecting hole and a fourth connecting hole arranged opposite to each other, the line connecting the center of the third connecting hole and the center of the fourth connecting hole being a second straight line, the third connecting hole and the second connecting hole being coaxially connected, the first connecting member being rotatably connected to the crank arm; a second connecting member having a fifth connecting hole and a sixth connecting hole arranged opposite to each other, the fifth connecting hole and the fourth connecting hole being coaxially connected, the second connecting member being rotatably connected to the first connecting member; and a frame having a seventh connecting hole coaxially connected to the sixth connecting hole, the second connecting member being rotatably connected to the frame; wherein, a blocking portion is formed on the first connecting member to prevent the rotating shaft from driving the crank arm to continue rotating, and the first straight line and the second straight line are collinear.

[0007] In one embodiment, the crank arm includes a base having the first connecting hole and the second connecting hole, and a protrusion extending obliquely from the base away from the first connecting hole. When the rotating shaft rotates, the blocking portion interferes with the protrusion to prevent the rotating shaft from rotating, thereby preventing the first straight line and the second straight line from being collinear after the rotating shaft drives the crank arm to continue rotating.

[0008] In one embodiment, the first connector includes a first connecting plate and a second connecting plate located on both sides of the crank arm in the thickness direction, and the blocking part is a connecting block located between the first connecting plate and the second connecting plate.

[0009] In one embodiment, the first connecting plate and the second connecting plate are equal-width plate-shaped members, and the dimension of the connecting block extending in the width direction of the first connecting member is smaller than the width of the first connecting plate and / or the second connecting plate.

[0010] In one embodiment, the second connector includes a third connecting plate and a fourth connecting plate that are parallel to each other, the third connecting plate being located on the side of the first connecting plate away from the second connecting plate, and the fourth connecting plate being located on the side of the second connecting plate away from the first connecting plate.

[0011] In one embodiment, the rotating shaft includes a cylindrical portion and a plurality of protruding teeth that are uniformly arranged and protrude outward from the circumferential outer surface of the cylindrical portion.

[0012] In one embodiment, the first connecting hole includes an arcuate surface corresponding to the outer surface of the cylindrical portion and a groove corresponding to the protruding tooth.

[0013] In one embodiment, the device includes a first shaft passing through the second connecting hole and the third connecting hole; a second shaft passing through the fourth connecting hole and the fifth connecting hole; and a third shaft passing through the sixth connecting hole and the seventh connecting hole.

[0014] In another aspect, this utility model provides a circuit breaker, including a limiting structure according to any one of the above claims.

[0015] In another aspect, this utility model provides a circuit breaker, including the aforementioned limiting structure and a moving contact assembly with a connector, the connector being located between the first connecting plate and the second connecting plate, and the connector having an eighth connecting hole coaxially connected to the fourth connecting hole.

[0016] In this invention, the crank arm, the first connecting member, the second connecting member, and the frame constitute a four-bar linkage. When the circuit breaker is closed, the energy storage mechanism drives the rotating shaft to rotate, thereby moving the four-bar linkage and further engaging the moving contact with the stationary contact. However, in some cases, excessive rotation of the rotating shaft causes the four-bar linkage to move to a dead position, preventing the rotating shaft from continuing to move and thus damaging the electrical circuit. In this invention, by providing a blocking part on the first connecting member, it is possible to prevent the first straight line on the crank arm from becoming collinear with the second straight line on the first connecting member after the rotating shaft drives the crank arm to continue rotating, thus preventing the four-bar linkage from entering the dead position. This limiting structure has the advantages of simple structure, accurate limiting, and high reliability. Attached Figure Description

[0017] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings, wherein:

[0018] Figure 1 This is a schematic diagram of the limiting structure of the circuit breaker of this utility model at one angle;

[0019] Figure 2 This is a schematic diagram of the limiting structure of the circuit breaker of this utility model from another angle;

[0020] Figure 3 This is a schematic diagram of the structure of the rotating shaft in this utility model;

[0021] Figure 4 This is a front view of the crank arm in this utility model;

[0022] Figure 5 This is a schematic diagram of the structure of the first connecting member in this utility model;

[0023] Figure 6 This is a schematic diagram of the structure of the second connecting member in this utility model;

[0024] Figure 7 This is a schematic diagram of the frame structure in this utility model;

[0025] Figure 8 This is a schematic diagram of the connector structure in this utility model.

[0026] Explanation of reference numerals in the attached figures

[0027] 1-Rotating shaft; 11-Cylindrical part; 12-Protruding tooth; 2-Crank arm; 201-First straight line; 210-Base; 211-First connecting hole; 212-Second connecting hole; 213-Arc-shaped surface; 214-Groove; 220-Protrusion; 3-First connector; 301-Second straight line; 311-Third connecting hole; 312-Fourth connecting hole; 320-Blocking part; 321-Connecting block; 330-First connecting plate; 340-Second connecting plate; 4-Second connector; 410-Third connecting plate; 411-Fifth connecting hole; 412-Sixth connecting hole; 420-Fourth connecting plate; 5-Frame; 511-Seventh connecting hole; 9-Connector; 91-Eighth connecting hole. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to specific embodiments. The embodiments given are only for illustrating the present invention and are not intended to limit the scope of the present invention.

[0029] like Figure 1As shown, this utility model provides a limiting structure for a circuit breaker, including a rotating shaft 1; a crank arm 2 having a first connecting hole 211 and a second connecting hole 212 arranged opposite to each other, the rotating shaft 1 passing through the first connecting hole 211 and capable of driving the crank arm 2 to rotate, the line connecting the center of the first connecting hole 211 and the center of the second connecting hole 212 being a first straight line 201; and a first connecting member 3 having a third connecting hole 311 and a fourth connecting hole 312 arranged opposite to each other, the line connecting the center of the third connecting hole 311 and the center of the fourth connecting hole 312 being a second straight line 301, the third connecting hole 311 and the second connecting hole 212 being... 212 are coaxially connected, with the first connector 3 rotatably connected to the crank arm 2; the second connector 4 has a fifth connector 411 and a sixth connector 412 disposed opposite to each other, the fifth connector 411 being coaxially connected to the fourth connector 312, and the second connector 4 being rotatably connected to the first connector 3; the frame 5 has a seventh connector 511 coaxially connected to the sixth connector 412, and the second connector 4 being rotatably connected to the frame 5; wherein, after the first connector 3 has a blocking part 320 to prevent the rotating shaft 1 from driving the crank arm 2 to continue rotating, the first straight line 201 and the second straight line 301 are collinear.

[0030] In this invention, the crank arm 2, the first connecting member 3, the second connecting member 4, and the frame 5 constitute a four-bar linkage. In the four-bar linkage, the crank arm 2 is equivalent to a crank, the first connecting member 3 is equivalent to a connecting rod, the second connecting member 4 is equivalent to a rocker arm, and the frame 5 is equivalent to a frame.

[0031] When the circuit breaker closes, the energy storage mechanism drives the rotating shaft 1 to rotate, thereby moving the four-bar linkage and further engaging the moving and stationary contacts. However, in some cases, excessive rotation of the rotating shaft 1 causes the four-bar linkage to move to a dead position, preventing the rotating shaft from continuing to move and thus damaging the electrical circuit. In this invention, by providing a blocking part 320 on the first connecting member 3, it is possible to prevent the rotating shaft 1 from driving the crank arm 2 to continue rotating. This prevents the first straight line 201 on the crank arm 2 from being collinear with the second straight line 301 on the first connecting member 3, thus preventing the four-bar linkage from entering the dead position. This limiting structure has the advantages of simple structure, accurate limiting, and high reliability.

[0032] Specifically, in a four-bar linkage, a "dead point" refers to the position where, during the movement of the mechanism, the connecting rod and the crank are collinear, and the output component cannot be driven or its direction of movement is uncertain.

[0033] In a preferred embodiment, the rotation axis 1 is from Figure 1 Rotate counterclockwise in the direction shown.

[0034] See Figure 2 and Figure 7 The limiting structure in this utility model may further include a first shaft 6 passing through the second connecting hole 212 and the third connecting hole 311, so that the first connecting member 3 is rotatably connected to the crank arm 2; a second shaft 7 passing through the fourth connecting hole 312 and the fifth connecting hole 411, so that the second connecting member 4 is rotatably connected to the first connecting member 3; and a third shaft 8 passing through the sixth connecting hole 412 and the seventh connecting hole 511, so that the second connecting member 4 is rotatably connected to the frame 5.

[0035] In one embodiment of this utility model, such as Figure 3 As shown, the rotating shaft 1 includes a cylindrical portion 11 and a plurality of protruding teeth 12 that protrude outward from the circumferential outer surface of the cylindrical portion 11 and are evenly arranged. It can be understood that the rotating shaft 1 is preferably splined.

[0036] Reference Figure 4 The crank arm 2 includes a base 210 with the first connecting hole 211 and the second connecting hole 212, and a protrusion 220 extending obliquely from the base 210 away from the first connecting hole 211. When the rotating shaft 1 rotates, the blocking part 320 interferes with the protrusion 220 to prevent the rotating shaft 1 from rotating, thereby preventing the rotating shaft 1 from driving the crank arm 2 to continue rotating. The first straight line 201 and the second straight line 301 are collinear, thus preventing the four-bar linkage from moving to its dead position. Here, "interference" refers to the collision between the blocking part 320 and the protrusion 220 due to spatial conflict during movement.

[0037] Understandably, in a preferred embodiment, the base 210 has a larger first end and a smaller second end, with the base 210 gradually transitioning from the first end to the second end. A first connecting hole 211 is formed at the first end, a second connecting hole 212 is formed at the second end, and a protrusion 220 extends obliquely upward from the second end, preferably with a size smaller than that of the second end. Furthermore, the first connecting hole 211 on the crank arm 2 includes an arcuate surface 213 corresponding to the outer surface of the cylindrical portion 11 and a groove 214 corresponding to the protruding tooth 12. Further, the crank arm 2 is preferably a plate of uniform thickness.

[0038] like Figure 5 As shown, the first connecting member 3 includes a first connecting plate 330 and a second connecting plate 340 located on both sides of the thickness direction of the crank arm 2, and the blocking part 320 is a connecting block 321 located between the first connecting plate 330 and the second connecting plate 340.

[0039] Specifically, the first connector 3 includes a length direction extending along the second straight line 301 and a width direction perpendicular to the length direction. Preferably, the first connecting plate 330 and the second connecting plate 340 of the first connector 3 are plate-shaped members of equal width, and the connecting block 321 extends in a dimension smaller than the width of the first connecting plate 330 and / or the second connecting plate 340 in the width direction of the first connector 3. Furthermore, the connecting block 321 is preferably located between the first connecting plate 330 and the second connecting plate 340, away from the protrusion 220.

[0040] Reference Figure 1 , Figure 2 and Figure 6 The second connector 4 includes a third connecting plate 410 and a fourth connecting plate 420 that are parallel to each other. The third connecting plate 410 is located on the side of the first connecting plate 330 away from the second connecting plate 340, and the fourth connecting plate 420 is located on the side of the second connecting plate 340 away from the first connecting plate 330. In other words, the second connector 4 is clamped to the outside of the first connector 3.

[0041] like Figure 1 , Figure 2 and Figure 7 As shown, in one embodiment, the frame 5 includes a pair of plate-shaped connectors arranged parallel to each other. The plate-shaped connectors are preferably clamped to the outside of the second connector 4, which is rotatably connected to the frame 5 via a third shaft 8 passing through the seventh connecting hole 511 and the sixth connecting hole 412.

[0042] In another aspect, this utility model provides a circuit breaker that includes the aforementioned limiting structure.

[0043] In a preferred embodiment, refer to Figure 1 , Figure 2 and Figure 8 The circuit breaker includes the aforementioned limiting structure and a moving contact assembly with a connector 9. The connector 9 is located between the first connecting plate 330 and the second connecting plate 340, and an eighth connecting hole 91 is formed on the connector 9, coaxially connected to the fourth connecting hole 312. When the rotating shaft 1 rotates counterclockwise, it drives the crank arm 2 and the second connecting member 3 to rotate, thereby causing the connector 9 to move upward, so that the moving contact engages with the stationary contact, realizing the closing of the circuit breaker.

[0044] The circuit breaker has the same advantages as the aforementioned limiting structure, which will not be elaborated here.

[0045] The above description is merely a preferred embodiment of this utility model and an explanation of the technical principles employed, and is not intended to limit this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. The scope of this utility model is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this utility model.

Claims

1. A position limiting structure of a circuit breaker, characterized by, include Rotation axis (1); The crank arm (2) has a first connecting hole (211) and a second connecting hole (212) arranged opposite to each other. The rotating shaft (1) passes through the first connecting hole (211) and can drive the crank arm (2) to rotate. The line connecting the center of the first connecting hole (211) and the center of the second connecting hole (212) is a first straight line (201). The first connector (3) has a third connecting hole (311) and a fourth connecting hole (312) arranged opposite to each other. The line connecting the center of the third connecting hole (311) and the center of the fourth connecting hole (312) is a second straight line (301). The third connecting hole (311) and the second connecting hole (212) are coaxially connected. The first connector (3) is rotatably connected to the crank arm (2). The second connector (4) has a fifth connecting hole (411) and a sixth connecting hole (412) disposed opposite to each other, the fifth connecting hole (411) being coaxially connected to the fourth connecting hole (312), and the second connector (4) being rotatably connected to the first connector (3). The frame (5) has a seventh connecting hole (511) coaxially connected to the sixth connecting hole (412), and the second connecting member (4) is rotatably connected to the frame (5). Wherein, after the first connecting member (3) has a blocking part (320) to prevent the rotating shaft (1) from driving the crank arm (2) to continue rotating, the first straight line (201) and the second straight line (301) are collinear.

2. The limiting structure according to claim 1, characterized in that, The crank arm (2) includes a base (210) having the first connecting hole (211) and the second connecting hole (212), and a protrusion (220) extending obliquely from the base (210) away from the first connecting hole (211). When the rotating shaft (1) rotates, the blocking part (320) interferes with the protrusion (220) to prevent the rotating shaft (1) from rotating, thereby preventing the rotating shaft (1) from driving the crank arm (2) to continue rotating. Then, the first straight line (201) and the second straight line (301) are collinear.

3. The limiting structure according to claim 1, wherein The first connector (3) includes a first connecting plate (330) and a second connecting plate (340) located on both sides of the thickness direction of the crank arm (2), and the blocking part (320) is a connecting block (321) located between the first connecting plate (330) and the second connecting plate (340).

4. The limiting structure according to claim 3, characterized in that, The first connecting plate (330) and the second connecting plate (340) are plate-shaped pieces of equal width. The dimension of the connecting block (321) extending in the width direction of the first connecting piece (3) is smaller than the width of the first connecting plate (330) and / or the second connecting plate (340).

5. The limiting structure according to claim 3, characterized in that, The second connector (4) includes a third connecting plate (410) and a fourth connecting plate (420) that are parallel to each other. The third connecting plate (410) is located on the side of the first connecting plate (330) away from the second connecting plate (340), and the fourth connecting plate (420) is located on the side of the second connecting plate (340) away from the first connecting plate (330).

6. The position-limiting structure according to claim 1, characterized in that, The rotating shaft (1) includes a cylindrical portion (11) and a plurality of protruding teeth (12) that are evenly arranged and protrude outward from the circumferential outer surface of the cylindrical portion (11).

7. The limiting structure according to claim 6, wherein The first connecting hole (211) includes an arc-shaped surface (213) corresponding to the outer surface of the cylindrical part (11) and a groove (214) corresponding to the protruding tooth (12).

8. The position-limiting structure according to claim 1, characterized in that, include The first shaft (6) passes through the second connecting hole (212) and the third connecting hole (311). The second shaft (7) passes through the fourth connecting hole (312) and the fifth connecting hole (411). The third shaft (8) passes through the sixth connecting hole (412) and the seventh connecting hole (511).

9. A circuit breaker characterized by, The circuit breaker includes a limiting structure according to any one of claims 1-8.

10. A circuit breaker, characterized in that, The circuit breaker includes a limiting structure according to claim 3 and a moving contact assembly having a connector (9) located between the first connecting plate (330) and the second connecting plate (340), and the connector (9) has an eighth connecting hole (91) coaxially connected to the fourth connecting hole (312).

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