Knife switch structure for circuit breaker

Abstract

The knife switch structure comprises a box body and two opening and closing doors, a placing cavity is arranged in the box body, the two opening and closing doors are rotatably arranged in the placing cavity, two protruding blocks are arranged in the placing cavity, a sliding groove is formed in the surface of the protruding block on the upper portion, and the opening and closing doors are arranged in the sliding groove. According to the utility model, the lead screw is rotated by the knob to drive the rotating mechanism and the movable contact plate to move, the second contact on the side wall of the tool bit is overlapped with the side wall of the static contact, the motor is started to drive the rotating shaft to rotate, and the driving lever rotates along with the rotating shaft, so that the sliding shaft slides in the sliding hole to drive the tool bit to rotate downwards; when the second contact slides to the side wall of the static contact, the second contact is tightly pressed on the side wall of the static contact, the second contact and the static contact are tightly attached, electric conduction is stable and reliable, at the moment, the movable contact plate and the static contact are conducted through the tool bit, the circuit breaker is switched on, normal use and operation are easy, and switching-on is stable and reliable.

Description

Technical Field

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

[0002] Under normal circumstances, the knife switch in the circuit breaker's knife switch structure should be used in conjunction with the circuit breaker and operated strictly according to the regulations. That is, when power is cut off, the circuit breaker should be opened first, and then the knife switch should be opened; when power is restored, the knife switch should be closed first, and then the circuit breaker should be closed.

[0003] However, during cabinet maintenance, the knife switch's opening and closing control handle may be accidentally touched by staff, causing the circuit breaker to close and resulting in serious consequences such as closing under load, endangering personal and equipment safety. Moreover, when the knife head closes, it is easy to collide with the top of the stationary contact seat, causing the contacts to be unable to slide down and stick to the side wall of the stationary contact seat for conductivity.

[0004] Therefore, it is necessary to provide a knife switch structure for circuit breakers to solve the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this utility model is to provide a knife switch structure for circuit breakers to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a knife switch structure for a circuit breaker, comprising a housing and opening / closing doors. The housing has a placement cavity, and two opening / closing doors are rotatably disposed within the placement cavity. Two protrusions are disposed within the placement cavity. A sliding groove is formed on the surface of the upper protrusion, and a slider is slidably disposed within the sliding groove. Three mounting blocks are evenly distributed on the front of the slider, and each of the three mounting blocks is provided with a movable contact plate. A rotating mechanism is provided on the surface of the movable contact plate, and the rotating mechanism includes a motor plate disposed on the movable contact plate. A motor is disposed on the side wall of the motor plate, and the output end of the motor is... The device has a rotating shaft. The bent portion of the movable contact plate has a second rotating hole and a wiring hole. The other end of the rotating shaft passes through the second rotating holes of the three movable contact plates in sequence. A blade is rotatably mounted on the side wall of the movable contact plate. A first contact point is provided on the side wall of the blade. The first contact point is located in the wiring hole and is always in contact with its edge for conductivity. A sliding hole is provided in the middle of the blade. A lever is fixedly mounted on the rotating shaft. A sliding shaft is provided on the side wall of the lever. Three mounting plates are evenly arranged on the surface of the protrusion below. A stationary contact is snapped into the top front of the mounting plate. Two buffer slopes are symmetrically opened on the top of the bent portion of the stationary contact. Two second contacts are provided on the side wall of the blade away from the movable contact plate.

[0007] As a preferred technical solution of this utility model, the two protrusions are arranged in parallel, the side wall of the slide groove is provided with a first rotating hole, the first rotating hole penetrates the side wall of the box, a lead screw is rotatably arranged in the slide groove, one end of the lead screw is provided with an optical axis rotatably arranged in the first rotating hole, and the optical axis extends to the outside of the box, the end of the optical axis is provided with a knob, and the side wall of the slider is provided with a threaded hole for the lead screw to pass through and drive with its thread.

[0008] As a preferred embodiment of this utility model, the stationary contact structure is L-shaped, and a first locking hole is provided on the stationary contact. The moving contact plate structure is an L-shaped plate, and a second locking hole is provided on the moving contact plate.

[0009] As a preferred embodiment of this utility model, the sliding hole is an elongated hole, and the sliding shaft is slidably disposed within the sliding hole.

[0010] As a preferred technical solution of this utility model, the side wall of the cutter head is provided with a cutting groove, and the two second contact points are symmetrically arranged about the cutting groove.

[0011] In a preferred embodiment of this invention, the bent portion of the stationary contact and the bent portion of the moving contact are arranged in parallel and at the same height.

[0012] As a preferred embodiment of this utility model, both of the opening and closing doors are provided with handles.

[0013] As a preferred embodiment of this utility model, the bottom of the placement cavity is provided with multiple wire holes.

[0014] As a preferred embodiment of this utility model, the protrusion is provided with a vertical plate, and the side wall of the vertical plate is provided with a limiting head for rotation.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] This utility model discloses a knife switch structure for a circuit breaker. The present invention uses a knob to rotate a lead screw, which drives a slider to slide along a groove, thereby moving a rotating mechanism and a moving contact plate until the side wall of the slider contacts a limit head. At this point, the second contact point on the side wall of the knife head coincides with the side wall of the stationary contact. A motor is then started, driving a rotating shaft to rotate. A lever rotates with the shaft, causing the sliding shaft to slide within a sliding hole, thus rotating the knife head downwards. The second contact point first contacts the buffer slope at the top of the stationary contact and slides down along the buffer slope. The buffer slope ensures that the second contact point slides stably onto the side wall of the stationary contact. Because the second contact point slides down along the buffer slope... When the second contact slides onto the side wall of the stationary contact, the entire knife head is under tension, which presses the second contact tightly against the side wall of the stationary contact. The two are in close contact, ensuring stable and reliable conductivity. At this time, the knife head connects the moving contact plate with the stationary contact, and the circuit breaker closes. Normal operation is simple, and closing is stable and reliable. Moreover, it does not require personnel to touch the knife head of the knife switch, resulting in high safety performance. When the knife head wears down due to prolonged use, the limit head can be adjusted to change the distance between the side wall of the knife head and the side wall of the stationary contact, thereby ensuring a tight fit between the second contact and the side wall of the stationary contact, stable conductivity, and extending the service life of the circuit breaker. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a three-dimensional schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a three-dimensional schematic diagram of the internal structure of this utility model;

[0020] Figure 3 This is a three-dimensional schematic diagram of the connection relationship between the rotating mechanism and the cutter head of this utility model;

[0021] Figure 4 This is an enlarged view of point A of this utility model;

[0022] Figure 5 This is a three-dimensional schematic diagram of the box structure of this utility model;

[0023] Figure 6 This is a three-dimensional schematic diagram of the static contact structure of this utility model;

[0024] Figure 7 This is a three-dimensional schematic diagram of the cutter head structure of this utility model;

[0025] Figure 8 This is a three-dimensional schematic diagram of the moving contact plate structure of this utility model.

[0026] In the diagram: 1. Box body; 101. Placement cavity; 102. Protrusion; 1021. Slide groove; 1022. First rotating hole; 103. Wire hole; 2. Opening and closing door; 3. Handle; 4. Mounting plate; 5. Stationary contact; 51. First locking hole; 52. Buffer slope; 6. Cutting head; 61. First contact point; 62. Slide hole; 63. Cutting groove; 64. Second contact point; 7. Moving contact plate; 71. Second locking hole; 72. Second rotating hole; 73. Wiring hole; 8. Rotating mechanism; 81. Motor plate; 82. Motor; 83. Rotating shaft; 84. Lever; 85. Slide shaft; 9. Lead screw; 10. Slider; 11. Mounting block; 12. Knob; 13. Vertical plate; 14. Limit head. Detailed Implementation

[0027] The embodiments of this utility model will now be described with reference to the accompanying drawings. In this process, to ensure clarity and convenience, we may exaggerate the width of lines or the size of constituent elements in the drawings.

[0028] Furthermore, the terms used below are defined based on the functions of this utility model and may vary depending on the user's or operator's intent or convention. Therefore, these terms are defined based on the entire contents of this specification.

[0029] like Figures 1 to 8 As shown, a knife switch structure for a circuit breaker includes a housing 1 and two opening / closing doors 2. The housing 1 has a placement cavity 101. Two opening / closing doors 2 are rotatably disposed within the placement cavity 101. Each opening / closing door 2 is equipped with a handle 3 for easy opening and closing. Two protrusions 102 are provided within the placement cavity 101, arranged parallel to each other. A sliding groove 1021 is formed on the surface of the upper protrusion 102. A first rotating hole 1022 is formed on the side wall of the sliding groove 1021, penetrating the side wall of the housing 1. A lead screw 9 is rotatably disposed within the sliding groove 1021. One end of the lead screw 9 has an optical axis that is rotatably disposed in the first rotating hole 1022 and extends to the outside of the housing 1. A knob 12 is provided at the end of the optical axis. A slider 10 is slidably disposed in the slide groove 1021. A threaded hole is provided on the side wall of the slider 10 for the lead screw 9 to pass through and drive with it. Three mounting blocks 11 are evenly disposed on the front of the slider 10. Each of the three mounting blocks 11 is provided with a movable contact plate 7. The movable contact plate 7 has an L-shaped plate structure and a second locking hole 71 is provided on the movable contact plate 7. The movable contact plate 7 is locked to the mounting block 11 by a screw passing through the second locking hole 71. A rotating mechanism 8 is provided on the surface of the movable contact plate 7.

[0030] like Figure 3 and Figure 4As shown, the rotating mechanism 8 includes a motor plate 81, which is mounted on a movable contact plate 7. A motor 82 is mounted on the side wall of the motor plate 81, and a rotating shaft 83 is mounted on the output end of the motor 82. The bent portion of the movable contact plate 7 has a second rotating hole 72 and a wiring hole 73. The other end of the rotating shaft 83 passes through three of the second rotating holes 72 of the movable contact plate 7 in sequence. A cutter head 6 is rotatably mounted on the side wall of the movable contact plate 7. A first contact point 61 is mounted on the side wall of the cutter head 6. The first contact point 61 is located inside the wiring hole 73 and is always in contact with its edge for electrical conduction. A sliding hole 62 is opened in the middle of the cutter head 6. The sliding hole 62 is an elongated hole. A lever 84 is fixedly mounted on the rotating shaft 83. A sliding shaft 85 is mounted on the side wall of the lever 84 and is slidably mounted inside the sliding hole 62.

[0031] like Figure 2 and Figure 3 As shown, three mounting plates 4 are evenly distributed on the surface of the protrusion 102 below. A stationary contact 5 is snapped onto the top front of the mounting plate 4. The stationary contact 5 has an L-shaped structure and a first locking hole 51. The stationary contact 5 is locked onto the mounting plate 4 by screws passing through the first locking hole 51. Two buffer slopes 52 are symmetrically provided on the top of the bent part of the stationary contact 5. A cutting groove 63 is provided on the side wall of the cutter head 6. Two second contact points 64 are provided on the side wall of the cutter head 6 away from the moving contact plate 7. The two second contact points 64 are symmetrically arranged about the cutting groove 63. The bent part of the stationary contact 5 and the bent part of the moving contact plate 7 are parallel and at the same height. A vertical plate 13 is provided on the protrusion 102. A limit head 14 is rotatably provided on the side wall of the vertical plate 13. Rotating knob 12 causes lead screw 9 to slide slider 10 along slide groove 1021, which in turn drives rotating mechanism 8 and moving contact plate 7 to move until the side wall of slider 10 abuts against limit head 14. At this time, the second contact point 64 on the side wall of cutter head 6 coincides with the side wall of stationary contact 5. Start motor 82 drives rotating shaft 83 to rotate. The lever 84 rotates with rotating shaft 83, which in turn causes slide shaft 85 to slide in slide hole 62 to drive cutter head 6 to rotate downward. The second contact point 64 first contacts the buffer slope 52 at the top of stationary contact 5 and slides down along buffer slope 52. Setting buffer slope 52 can ensure that the second contact point 64 slides down stably to the side wall of stationary contact 5, and the two are tightly attached, and the conductivity is stable and reliable. At this time, cutter head 6 connects moving contact plate 7 and stationary contact 5, the circuit breaker closes, and normal use is simple and the closing is stable and reliable.

[0032] The bottom of the placement cavity 101 has multiple wire holes 103 to facilitate the routing of internal components.

[0033] Specifically, the implementation involves rotating the screw 9 via the knob 12 to drive the slider 10 to slide along the slide groove 1021, thereby moving the rotating mechanism 8 and the moving contact plate 7 until the side wall of the slider 10 abuts against the limiting head 14. At this time, the second contact point 64 on the side wall of the cutter head 6 coincides with the side wall of the stationary contact 5. The motor 82 is started to drive the rotating shaft 83 to rotate, and the lever 84 rotates with the rotating shaft 83, thereby causing the slide shaft 85 to slide in the slide hole 62 to drive the cutter head 6 to rotate downward. The second contact point 64 first contacts the buffer slope 52 at the top of the stationary contact 5 and slides down along the buffer slope 52. The buffer slope 52 ensures that the second contact point 64 slides down stably onto the side wall of the stationary contact 5. When the second contact 64 slides down to the side wall of the stationary contact 5, the knife head 6 is in a tensioned state, which makes the second contact 64 press tightly against the side wall of the stationary contact 5. The two are in close contact, and the conductivity is stable and reliable. At this time, the knife head 6 connects the moving contact plate 7 with the stationary contact 5, and the circuit breaker closes. Normal use is simple, the closing is stable and reliable, and there is no need for the operator to touch the knife head of the knife switch, which has high safety performance. When the knife head 6 is used for a long time and the second contact 64 is worn, the limit head 14 can be adjusted to change the distance between the side wall of the knife head 6 and the side wall of the stationary contact 5, thereby ensuring that the second contact 64 and the side wall of the stationary contact 5 are in close contact, the conductivity is stable, and the service life of the circuit breaker is extended.

[0034] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A knife switch structure for a circuit breaker, comprising a housing (1) and opening / closing doors (2), wherein a placement cavity (101) is provided inside the housing (1), and two opening / closing doors (2) are provided, the two opening / closing doors (2) being rotatably disposed within the placement cavity (101), characterized in that: Two protrusions (102) are provided in the placement cavity (101). The surface of the upper protrusion (102) is provided with a groove (1021). A slider (10) is slidably arranged in the groove (1021). Three mounting blocks (11) are evenly arranged on the front of the slider (10). Each of the three mounting blocks (11) is provided with a movable contact plate (7). A rotating mechanism (8) is provided on the surface of the movable contact plate (7). The rotating mechanism (8) includes a motor plate (81). The motor plate (81) is arranged on the movable contact plate (7). A motor (82) is provided on the side wall of the motor plate (81). A rotating shaft (83) is provided at the output end of the motor (82). A second rotating hole (72) and a wiring hole (73) are provided on the bent part of the movable contact plate (7). The other end of the rotating shaft (83) is attached to the... The second rotating hole (72) passes through the three moving contact plates (7). The moving contact plate (7) is rotatably provided with a blade (6). The blade (6) is provided with a first contact point (61) on its side wall. The first contact point (61) is located in the wiring hole (73) and is always in contact with its edge for conduction. The blade (6) is provided with a sliding hole (62) in the middle. The rotating shaft (83) is fixedly provided with a lever (84). The lever (84) is provided with a sliding shaft (85) on its side wall. The surface of the protrusion (102) below is evenly provided with three mounting plates (4). The top front of the mounting plate (4) is snapped with a stationary contact (5). The top of the bent part of the stationary contact (5) is symmetrically provided with two buffer slopes (52). The side wall of the blade (6) away from the moving contact plate (7) is provided with two second contacts (64).

2. The circuit breaker knife switch structure according to claim 1, characterized in that: The two protrusions (102) are arranged in parallel. The side wall of the slide groove (1021) is provided with a first rotating hole (1022). The first rotating hole (1022) penetrates the side wall of the housing (1). A lead screw (9) is rotatably arranged in the slide groove (1021). One end of the lead screw (9) is provided with an optical axis rotatably arranged in the first rotating hole (1022) and the optical axis extends to the outside of the housing (1). A knob (12) is provided at the end of the optical axis. The side wall of the slider (10) is provided with a threaded hole for the lead screw (9) to pass through and drive with its thread.

3. The circuit breaker knife switch structure according to claim 1, characterized in that: The stationary contact (5) has an L-shaped structure and a first locking hole (51) is provided on the stationary contact (5). The moving contact plate (7) has an L-shaped structure and a second locking hole (71) is provided on the moving contact plate (7).

4. The circuit breaker knife switch structure according to claim 1, characterized in that: The sliding hole (62) is an elongated hole, and the sliding shaft (85) is slidably disposed in the sliding hole (62).

5. The circuit breaker knife switch structure according to claim 1, characterized in that: The cutter head (6) has a cutting groove (63) on its side wall, and two second contact points (64) are symmetrically arranged about the cutting groove (63).

6. The circuit breaker knife switch structure according to claim 1, characterized in that: The bent portion of the stationary contact (5) and the bent portion of the moving contact plate (7) are arranged in parallel and are at the same height.

7. The circuit breaker knife switch structure according to claim 1, characterized in that: Both of the opening and closing doors (2) are equipped with handles (3).

8. The circuit breaker knife switch structure according to claim 1, characterized in that: The bottom of the placement cavity (101) is provided with multiple wire holes (103).

9. The circuit breaker knife switch structure according to claim 1, characterized in that: A vertical plate (13) is provided on the protrusion (102), and a limit head (14) is rotatably provided on the side wall of the vertical plate (13).

Images