Switching-on and switching-off linkage mechanism for moving contact of direct-current circuit breaker

Abstract

The utility model provides a direct current circuit breaker moving contact opening and closing linkage mechanism comprising a moving contact which is hinged with a copper bar of a direct current circuit breaker and is electrically connected with the copper bar, and the copper bar is fixed on an installation support; the number of the sliding blocks is two, and the two sliding blocks are correspondingly arranged on the two side walls of the moving contact; the shifting fork is arranged on the periphery of the moving contact and clamped with the sliding block, one end, far away from the sliding block, of the shifting fork is connected with the electromagnetic actuating mechanism, and the electromagnetic actuating mechanism drives the shifting fork to push the moving contact to rotate around the copper bar by extruding the sliding block; and the arc contact is rotatably arranged at the top end of the moving contact, a first elastic piece is arranged between one end part of the arc contact and the end surface of the top end of the moving contact, and the first elastic piece is used for keeping the arc contact in a forward extending state. According to the utility model, the opening action time can be effectively reduced, the closing stability is improved, the moving contact silver point is protected, and the maintenance is convenient.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of circuit breaker, especially is involved in a DC circuit breaker movable contact opening and closing linkage mechanism. BACKGROUND

[0002] The prior art technical scheme of the DC circuit breaker movable contact opening and closing linkage mechanism is as follows: a through hole is processed on the movable contact, a metal shaft is fixed by an elastic baffle ring, both ends of the metal shaft are sleeved into a hollow roller, the roller is limited by the elastic baffle ring, and the fork is placed above the roller. The movement process of the mechanism is as follows: when the closing mechanism is powered, the fork is pushed forward, the fork boss pushes the roller, the movable contact moves towards the static contact, the movable contact and the static contact are pressed tightly, and closing is completed; when the opening mechanism is powered, the fork is pushed upward, the fork boss is separated from the roller, the movable contact is separated from the static contact under the action of the opening spring, and finally, the movable contact is at the initial position, and opening is completed.

[0003] Based on the above content, the linkage mechanism in the prior art has at least the following problems:

[0004] (1) The pressure between the movable contact and the static contact is large, in order to ensure the strength of the mechanism, the diameter of the metal shaft for fixing the roller is increased, and the thickness of the roller is also increased, so that the outer diameter of the roller is large, and therefore, the distance between the fork boss and the roller is too long during opening, the friction between the fork boss and the roller is large due to the large pressure, and finally, the separation speed of the fork and the roller is slow due to the two reasons, the opening time is long, and the performance of the circuit breaker is directly affected.

[0005] (2) The pressure of the fork on the roller is large during closing, so the sliding friction between the roller and the metal shaft is greater than the rolling friction between the roller and the fork, the movable contact rotates around the shaft center during closing, the roller and the metal shaft are relatively stationary, and the roller rolls with the fork, so that the fork is upturned after the movable contact is stationary after completing the closing action, the fork boss and the outer surface of the roller are worn after the number of operations is increased, the closing is tripped, and the closing cannot be completed.

[0006] (3) The roller is a hollow structure, the fork will impact the roller during closing, the roundness of the roller will be reduced with the accumulation of the number of times, the roller can rotate freely on the metal shaft, the roller is out of round, the roller surface contacted by the left and right rods of the fork is inconsistent during closing, the left and right rods of the fork are subjected to different forces during opening, the left and right rods of the fork are made of one piece of material, the internal stress generated by machining and heat treatment will make the two fork rods inconsistent, the fork rods cannot be completely leveled, and the two reasons will make the actions of the left and right rods of the fork inconsistent, the circuit breaker will be opened again after opening, and the circuit breaker will fail to open, and the electrical components will be burned out.

[0007] (4) in order to ensure that both sides of the roller can be free rolling, so the use of elastic check ring for limiting, elastic check ring is subjected to force, easy to break failure, reduce the stability of the whole mechanism.

[0008] (5) contact silver point is directly welded on the moving contact, the arc produced when the switch is opened directly burns the silver point, after the silver point is burned out, only the moving contact can be replaced, the cost is higher, and the replacement is difficult and complicated. Practical new type content

[0009] Therefore, the direct current circuit breaker moving contact opening and closing linkage mechanism is provided to solve at least one of the above problems.

[0010] In order to achieve the above purpose, the technical scheme of the utility model is as follows:

[0011] The utility model provides a kind of direct current circuit breaker moving contact opening and closing linkage mechanism, comprising:

[0012] Moving contact, the moving contact is hinged with the copper bar of direct current circuit breaker, and is electrically connected with the copper bar, and the copper bar is fixed to mounting bracket;

[0013] Slide block, the number of slide block is two, two slide block are correspondingly arranged on the two side walls of the moving contact;

[0014] Yoke, the yoke is arranged on the periphery of the moving contact, and is clamped with the slide block, and the end of yoke away from the slide block is connected with electromagnetic actuating mechanism, and the electromagnetic actuating mechanism drives the yoke, and the moving contact is pushed to rotate around copper bar by extruding the slide block;

[0015] Arc contact, the arc contact is rotatably arranged at the top end of the moving contact, and a first elastic member is arranged between the end of the arc contact and the top end face of the moving contact, and the first elastic member is used to keep the arc contact in protruding state.

[0016] Further, the yoke includes two yoke rods arranged in two parts, and the two yoke rods are located on the two sides of the moving contact, and the upper end surface of the yoke rod extends upwardly with a boss.

[0017] Further, the end surface of the slide block adjacent to the boss is an arc surface, and the arc surface is tangent to the top end surface of the slide block.

[0018] The bottom end surface of the slide block is attached to the upper end surface of the yoke rod.

[0019] Further, a groove is formed in the arc surface of the slide block, and the groove cooperates with the boss.

[0020] Further, a plurality of threaded rods are arranged through the sliding block and the movable contact, and ends of the threaded rods are fixed by nuts.

[0021] Further, the shifting fork rod is connected with the electromagnetic actuator through a connecting piece, a fixing hole is formed in the connecting piece, an end of the shifting fork rod is arranged in the fixing hole, and the shifting fork rod is fixed in the fixing hole by adhesive.

[0022] Further, a connecting portion is arranged on a top end surface of the movable contact in an upward direction, a containing and stopping groove is formed in a bottom end of the arc contact, the containing and stopping groove is arranged on the connecting portion in a corresponding mode, and the arc contact and the connecting portion are connected by a fixing pin and a split pin.

[0023] An opening is formed in a side wall of the movable contact away from the silver point, a mounting hole is formed in the opening, the first elastic member is arranged above the mounting hole, a top end of the first elastic member abuts against the arc contact, and a compression bolt is arranged in the mounting hole through the movable contact and the first elastic member.

[0024] Further, a groove is formed in an outer wall of a bottom end of the movable contact.

[0025] The frame of the direct current circuit breaker is connected with a connecting rod through a second elastic member, and an end of the connecting rod is attached to an inner wall of the groove.

[0026] Further, the first elastic member and the second elastic member are springs.

[0027] Compared with the prior art, the direct current circuit breaker movable contact opening and closing linkage mechanism has the following beneficial effects:

[0028] The direct current circuit breaker movable contact opening and closing linkage mechanism can effectively reduce the opening action time, improve the closing stability, eliminate the opening and closing compound situation, improve the stability of the whole mechanism, protect the silver point of the movable contact and facilitate maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0029] The drawings constituting a part of the present application are used to provide a further understanding of the present application, the illustrative embodiments of the present application and the description thereof are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0030] Figure 1 The first angle structure of the direct current circuit breaker movable contact opening and closing linkage mechanism is shown in the drawings.

[0031] Figure 2A second angle structure schematic diagram of a direct current circuit breaker moving contact opening and closing linkage mechanism according to an embodiment of the present utility model;

[0032] Figure 3 A connecting diagram of a shift fork and a sliding block according to an embodiment of the present utility model;

[0033] Figure 4 A shift fork schematic diagram according to an embodiment of the present utility model;

[0034] Figure 5 A shift fork schematic diagram according to an embodiment of the present utility model;

[0035] Figure 6 A sliding block structure schematic diagram according to an embodiment of the present utility model.

[0036] Marking of the drawing:

[0037] 1, moving contact; 11, connecting part; 12, notch; 13, silver dot; 14, recess; 2, copper bar; 3, shift fork; 31, shift fork rod; 32, boss; 4, sliding block; 41, groove; 42, threaded rod; 43, nut; 5, arc contact; 51, fixed pin shaft; 52, split pin; 6, connecting piece; 7, compression bolt; 8, first elastic member. Specific implementation

[0038] It should be noted that the embodiments in the present utility model and the features in the embodiments can be combined with each other without conflict.

[0039] The present utility model will be described in detail below with reference to the drawings and in combination with embodiments.

[0040] Please refer to Figure 1 and Figure 2 , the present embodiment provides a direct current circuit breaker moving contact opening and closing linkage mechanism, which comprises:

[0041] Moving contact 1, the moving contact 1 is hinged with the copper bar 2 of the direct current circuit breaker and is electrically connected with the copper bar 2, and the copper bar 2 is fixed to the mounting bracket;

[0042] Sliding block 4, the number of the sliding block 4 is two, and the two sliding blocks 4 are correspondingly arranged on the two side walls of the moving contact 1;

[0043] Shift fork 3, the shift fork 3 is arranged on the periphery of the moving contact 1 and is clamped with the sliding block 4, and the end of the shift fork 3 away from the sliding block 4 is connected with the electromagnetic actuating mechanism, the electromagnetic actuating mechanism (the electromagnetic actuating mechanism described in the present embodiment is a conventional mechanism in the field, such as electromagnetic valve and the like, which will not be described here, and the electromagnetic actuating mechanism is not shown in the drawings) drives the shift fork 3 to push the moving contact 1 to rotate around the copper bar 2 by extruding the sliding block 4;

[0044] The arc contact 5 is rotatably arranged at the top end of the movable contact 1, and a first elastic member 8 (a spring in this embodiment) is arranged between one end of the arc contact 5 and the top end face of the movable contact 1, so as to keep the arc contact 5 in the protruding state.

[0045] Specifically, in this embodiment, two sliding blocks 4 are fixed on the two side walls of the movable contact 1, and cooperate with the yoke 3 arranged on the periphery of the movable contact 1. The yoke 3 is engaged with the sliding block 4, and the yoke 3 is driven by the electromagnetic actuator. The movable contact 1 is pushed to rotate around the copper bar 2 through the sliding block 4. At the same time, the arc contact 5 is arranged at the top end of the movable contact 1, and a pushing force is applied by the elastic member to contact or separate the silver point 13, so as to protect the silver point 13 from being burned by the arc. When the arc contact 5 is burned out, only the arc contact 5 needs to be replaced.

[0046] The linkage mechanism can effectively reduce the opening time, improve the closing stability, eliminate the opening and closing combination, improve the stability of the whole mechanism, and protect the silver point of the movable contact and facilitate maintenance.

[0047] In some embodiments, the yoke 3 includes two yoke rods 31 arranged in two parts. The two yoke rods 31 are located on the two sides of the movable contact 1, and the upper end face of the yoke rod 31 extends upwardly with a boss 32.

[0048] The yoke rod 31 is connected with the electromagnetic actuator through the connecting member 6. The connecting member 6 is provided with a fixing hole, and the end of the yoke rod 31 is deeply arranged in the fixing hole and fixed in the fixing hole by adhesive.

[0049] Specifically, in this embodiment, the yoke 3 is improved to be a left and right rod split yoke 3, and the height of the boss 32 on the yoke rod 31 is reduced. The yoke rod 31 is modified to be pressed against the sliding block 4 from below, as shown in Figures 1 to 3 .

[0050] The original yoke 3 is integrally machined, as shown in Figure 4 . Due to the slender shape of the yoke rod 31, internal stress is generated during machining and heat treatment, which causes the yoke rod 31 to deform. Even if the yoke rod 31 is reshaped, it is difficult to make the left and right sides consistent and completely parallel. The height of the boss 32 of the original yoke rod 31 is 6.5 mm, and the radius of the roller is 5 mm.

[0051] After the design improvement, the length of the yoke rod 31 is shortened, as shown in Figure 5 . The internal stress generated during machining and heat treatment is reduced, the yoke rod 31 is prevented from deforming, and the left and right rods can be made consistent through assembly tooling. The height of the boss 32 is changed to 2 mm, and the sliding block 4 in contact with the boss 32 is an acute angle edge, so the opening stroke is ≤2 mm, which is greatly reduced compared with the original design.

[0052] The application improves the integral processing of the fork lever 31 to separate processing of the left and right levers, and shortens the length of the fork lever 31. The originally freely rotating roller is improved to a fixed sliding block 4, which eliminates the problem of inconsistent relative positions of the left and right rollers of the fork 3 when the brake is closed, and avoids the situation of secondary opening and closing of the brake.

[0053] In some embodiments, a plurality of threaded rods 42 are arranged through the sliding block 4 and the movable contact 1, and the ends of the threaded rods 42 are fixed by nuts 43.

[0054] The end face of the sliding block 4 adjacent to the boss 32 is an arc face, and the arc face is tangent to the top end face of the sliding block 4. A groove 41 is arranged on the arc face of the sliding block 4, and the groove 41 cooperates with the boss 32.

[0055] The bottom end face of the sliding block 4 is attached to the upper end face of the fork lever 31.

[0056] Specifically, in the present embodiment, the metal shaft is replaced by two metal rods with threads machined at both ends, and the rollers on both sides are replaced by two sliding blocks 4. The original fixing method of the shaft using an elastic retaining ring is improved to four sets of nuts 43 matched with flat pads and elastic pads.

[0057] The threaded rods 42 pass through the movable contact 1 and the sliding blocks 4 on both sides to connect them together, and the two sides are then fixed by nuts 43 matched with flat pads and elastic pads, as shown in Figure 3 The original elastic retaining ring for the shaft using a limiting roller is improved to a nut 43 for fixing the sliding block 4. The force value that can be borne by the tightened nut 43 is much larger than that of the shaft using the elastic retaining ring, which solves the problem of easy failure of the retaining ring under stress, greatly enhancing the stability of the system.

[0058] One side of the sliding block 4 is arranged as a circular arc, and a groove 41 is machined at the lower part of the circular arc. The remaining three adjacent planes are perpendicular to each other. The arc face is tangent to one of the planes, and the included angle between the other plane is an acute angle, and the included angles of the other planes are rounded, as shown in Figure 6 .

[0059] The application improves the roller to a sliding block 4, and reduces the height of the boss 32 arranged on the fork lever 31, thereby shortening the movement distance during opening, accelerating the separation speed of the fork 3 and the movable contact 1, reducing the time used for opening, and improving the performance of the product.

[0060] The fork 3 contacts the sliding block 4 from below. During the closing process, the boss 32 first contacts the arc groove 41 of the sliding block 4, and during the process of pushing the movable contact 1 to rotate around the shaft center, the boss face and the sliding block arc face produce sliding friction. The boss face is subjected to an upward force, so that the fork lever 31 can rely on the friction force to tightly move with the sliding block 4, eliminating the problem of upward tilting of the original design fork 3.

[0061] In some embodiments, the top end of the moving contact 1 extends upwardly with a connecting portion 11, the bottom end of the arc contact 5 is provided with a containing and stopping groove, the containing and stopping groove is correspondingly arranged on the connecting portion 11, and the arc contact 5 is connected with the connecting portion 11 through the fixed pin shaft 51 and the split pin 52;

[0062] The side wall of the top end of the moving contact 1 away from the silver point 13 is provided with an opening 12, the opening 12 is provided with a mounting hole, the first elastic member 8 is arranged above the mounting hole, the top end of the first elastic member 8 abuts against the arc contact 5, and the compression bolt 7 is arranged in the mounting hole through the moving contact 1 and the first elastic member 8.

[0063] Specifically, in the embodiment, the arc contact 5 is additionally arranged at the top end of the moving contact 1, the arc contact 5 is fixed on the top end of the moving contact 1 through the pin shaft and can swing forward and backward, the spring is arranged at the rear end of the arc contact 5, the arc contact 5 is pushed to keep the arc contact 5 in the forward state, the arc contact 5 is first contacted with the silver point 13 to be electrified when the breaker is closed, the electric arc appears in the arc contact 5 before the contact, the arc contact 5 is disconnected with the silver point 13 when the breaker is opened, the high-energy electric arc generated when the breaker is opened also appears in the arc contact 5, and the silver point 13 is protected from being burned by the electric arc, the arc contact 5 only needs to be replaced when the arc contact 5 is burned, the maintainability of the equipment is increased, and the maintenance cost is greatly reduced.

[0064] In some embodiments, the bottom end of the moving contact 1 is provided with the groove 14 on the outer wall thereof;

[0065] The frame of the DC circuit breaker is connected with the connecting rod through the second elastic member (the second elastic member in the embodiment is a spring), the end of the connecting rod is attached to the inner wall of the groove 14, and it needs to be noted that the frame, the second elastic member and the connecting rod are not shown in the drawings, and the frame, the second elastic member and the connecting rod are all existing structures, and the embodiment will not be described in more details.

[0066] Specifically, in the embodiment, the groove 14 is arranged on the side wall of the bottom end of the moving contact 1 away from the copper bar 2, and the groove 14 is arranged to enable the electromagnetic actuator to return to the original position when the breaker is opened, at this time, the second elastic member (spring) rapidly rebounds under the compression reaction force to drive the moving contact 1 to return to the original position, and the fast opening of the moving contact and the static contact is realized.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be included in the scope of the claims and the description of the present application.

[0068] The above is only a preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A DC circuit breaker movable contact opening and closing linkage mechanism characterized by, The utility model relates to a kind of movable contactor of DC circuit breaker, including: Movable contact, the movable contact is hinged with copper bar of DC circuit breaker, and is electrically connected with the copper bar, the copper bar is fixed to mounting support; Slider, the number of two sliders is two, two the slider is correspondingly arranged on the two side walls of the movable contact; Yoke, the yoke is arranged on the periphery of the movable contact, and is engaged with the slider, the end of yoke away from the slider is connected with electromagnetic actuator, the electromagnetic actuator drives the yoke, and the movable contact is pushed around copper bar by extruding the slider to rotate; Arc contact, the arc contact is rotationally arranged on the top end of the movable contact, and first elastic member is arranged between the end of the arc contact and the top end end surface of the movable contact, the first elastic member is used to make the arc contact keep protruding state.

2. The movable contact operating mechanism of the DC circuit breaker according to claim 1, wherein: The yoke comprises two yoke rods arranged in two parts, and the two yoke rods are located on the two sides of the movable contact, and the upper end surface of the yoke rod extends upwardly with a boss.

3. The movable contact operating mechanism of the DC circuit breaker according to claim 2, wherein: The end surface of the slider adjacent to the boss is an arc surface, and the arc surface is tangent to the top end surface of the slider; The bottom end surface of the slider is attached to the upper end surface of the yoke rod.

4. The movable contact operating mechanism of the DC circuit breaker according to claim 3, wherein: A groove is formed on the arc surface of the slider, and the groove cooperates with the boss.

5. The movable contact operating mechanism of the DC circuit breaker according to claim 3, wherein: A plurality of threaded rods are arranged through the slider and the movable contact, and the end of the threaded rod is fixed by a nut.

6. The movable contact operating mechanism of the DC circuit breaker according to claim 2, wherein: The yoke rod is connected to the electromagnetic actuator by a connecting piece, a fixing hole is formed in the connecting piece, the end of the yoke rod is inserted into the fixing hole, and the yoke rod is fixed in the fixing hole by adhesive.

7. The movable contact operating mechanism of the DC circuit breaker according to claim 1, wherein: The top end surface of the movable contact extends upwardly with a connecting part, a containing groove is formed on the bottom end of the arc contact, the containing groove is arranged on the connecting part, and the arc contact is connected to the connecting part by a fixing pin and a split pin; An opening is formed on the side wall of the top end of the movable contact away from the silver point, an installation hole is formed in the opening, the first elastic member is arranged above the installation hole, the top end of the first elastic member abuts against the arc contact, a compression bolt is arranged in the installation hole through the movable contact and the first elastic member.

8. The movable contact operating mechanism of the DC circuit breaker according to claim 1, wherein: A groove is formed on the bottom end outer wall of the movable contact; A connecting rod is connected to the frame of the DC circuit breaker by a second elastic member, and the end of the connecting rod is attached to the inner wall of the groove. 9.The moving contact opening and closing linkage mechanism of a DC circuit breaker according to claim 8, characterized in that: the first elastic member and the second elastic member are springs.

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