Magnetic tripping device for short circuit instantaneous protection and circuit breaker

Abstract

The utility model discloses a magnetic tripping device for short circuit instantaneous protection, which is arranged in a circuit breaker body, a mutual inductor shell, a draw bar and a conductive connecting plate are arranged in the circuit breaker body, and the magnetic tripping device comprises a static magnetic piece and a movable magnetic piece; the static magnetic part is installed on the conductive connecting plate, the movable magnetic part is movably installed on a fixing base of the mutual inductor shell, the fixing base is provided with a reset part used for resetting of the movable magnetic part, the static magnetic part and the movable magnetic part are oppositely arranged, and the movable magnetic part can trigger the traction rod under the action of attraction force of the static magnetic part. According to the magnetic tripping device designed by the utility model, a split type assembling mode of the static magnetic piece and the movable magnetic piece is adopted, the static magnetic piece is arranged on the circuit breaker base, the movable magnetic piece is arranged on the mutual inductor shell, and the split type assembling mode enables the installation to be convenient and the consistency to be strong. The circuit breaker is relatively simple in structure, convenient to assemble, relatively small in occupied space in the circuit breaker body, and beneficial to function expansion of the circuit breaker.

Description

TECHNICAL FIELD

[0001] The utility model relates to circuit breaker technical field, in particular to a kind of magnetic tripping device and circuit breaker for short-circuit instantaneous protection. BACKGROUND

[0002] Circuit breaker is a kind of switch device that can be closed, load and open the current under normal loop condition and can be closed, load and open the current under abnormal loop condition within specified time. Among them, magnetic tripping device is the important component structure of circuit breaker, when short-circuit current is generated in main circuit, magnetic tripping device instantaneously drives traction rod to rotate, traction rod triggers the lock catch of operating mechanism to be tripped, operating mechanism acts to cut off main circuit, to realize the effect of short-circuit instantaneous protection, ensure circuit safety.

[0003] At present, magnetic tripping device is integrally installed on circuit breaker base, and this integral assembly mode leads to inconvenient installation and poor consistency. For example, the existing static magnetic piece and dynamic magnetic piece are fixed on the circuit breaker base by a frame. Moreover, the existing magnetic tripping device structure is relatively complex, assembly is cumbersome, and it occupies a large space in the circuit breaker body, which is not conducive to the functional expansion of the circuit breaker. SUMMARY

[0004] The utility model provides a kind of new magnetic tripping device and circuit breaker for short-circuit instantaneous protection in view of the problems and deficiencies of prior art.

[0005] The utility model solves the above technical problems by the following technical solutions:

[0006] The utility model provides a kind of magnetic tripping device for short-circuit instantaneous protection, is placed in circuit breaker body, and the circuit breaker body is provided with mutual inductor shell, traction rod and conducting connecting plate, and it is characterized in that, the magnetic tripping device includes static magnetic piece and dynamic magnetic piece.

[0007] The static magnetic piece is installed on the conducting connecting plate, the dynamic magnetic piece is movably installed on the fixed seat of mutual inductor shell, the fixed seat is provided with reset piece for the reset of dynamic magnetic piece, the static magnetic piece and dynamic magnetic piece are oppositely arranged, and the dynamic magnetic piece can trigger traction rod under the attraction of static magnetic piece.

[0008] The technical scheme can realize the short-circuit instantaneous protection function of circuit breaker, the static magnetic piece is installed on circuit breaker base, and the dynamic magnetic piece is installed on mutual inductor shell, and the split assembly mode of this magnetic tripping device makes installation convenient and consistent.

[0009] Preferably, the magnetic tripping device further includes a static magnetic support, and the static magnetic support, conducting connecting plate and static magnetic piece are fixedly arranged.

[0010] Preferably, the static magnetic part is fixed on the top of the static magnetic support, and the static magnetic part is fixedly connected with the circuit breaker base through the static magnetic support.

[0011] Alternatively, the static magnetic part is fixed on the bottom of the static magnetic support, and the static magnetic support is fixedly connected with the circuit breaker base through the static magnetic part.

[0012] The technical scheme provides two feasible schemes of installation positions of the static magnetic part.

[0013] Preferably, the conductive connecting plate is installed below the static magnetic support, between the static magnetic part and the static magnetic support, or between the static magnetic part and the dynamic magnetic part.

[0014] Preferably, the static magnetic part is a magnetic yoke, and the static magnetic support is a U-shaped magnetic yoke support.

[0015] The left and right sides of each vertical part of the U-shaped magnetic yoke support are fixed with a side edge, so that each vertical part of the U-shaped magnetic yoke support and the side edge form a guide groove.

[0016] Preferably, the dynamic magnetic part comprises an inverted U-shaped armature, the inverted U-shaped armature is located directly above the magnetic yoke, and the two vertical sides of the inverted U-shaped armature are respectively limited in the corresponding guide grooves.

[0017] The technical scheme limits and guides the sliding of the inverted U-shaped armature up and down, so that the inverted U-shaped armature can stably slide.

[0018] Preferably, the dynamic magnetic part further comprises a magnetic tripping part, the magnetic tripping part is fixed on the horizontal part of the inverted U-shaped armature, and the tripping end of the magnetic tripping part is matched with the traction rod.

[0019] Preferably, the magnetic tripping part comprises a mounting plate and an L-shaped instantaneous pull rod, the mounting plate is fixed on the horizontal part of the inverted U-shaped armature, the L-shaped instantaneous pull rod is fixed on the side of the mounting plate, and the L-shaped tripping end of the L-shaped instantaneous pull rod is located directly above the traction block of the traction rod.

[0020] The technical scheme fixes the magnetic tripping part and the inverted U-shaped armature together, can quickly move downward in linkage, achieves instantaneous opening, and realizes the short-circuit instantaneous protection function of the circuit breaker.

[0021] Preferably, the magnetic tripping device further comprises an adjusting mechanism, the adjusting mechanism comprises an adjustable screw, a reset part and a limiting structure, the top of the adjustable screw is fixedly provided in the fixed seat, the reset part and the dynamic magnetic part are sleeved on the adjustable screw, the bottom of the adjustable screw is fixed with the limiting structure, and the top of the reset part is abutted against the bottom of the dynamic magnetic part, and the bottom of the reset part is abutted against the top of the limiting structure.

[0022] The technical scheme adjusts the distance or attraction force between the static magnetic part and the dynamic magnetic part by screwing the adjustable screw up and down.

[0023] The utility model discloses still provide a circuit breaker, its characterized in that, it includes above-mentioned magnetic release device.

[0024] On the basis of conforming to the common sense of the field, the above-mentioned preferred conditions can be combined arbitrarily, that is, the preferred examples of the utility model are obtained.

[0025] The positive progress effect of the utility model is that:

[0026] The magnetic release device designed in the utility model adopts a split assembly mode of static magnetic part and dynamic magnetic part, the static magnetic part is installed on the circuit breaker base, and the dynamic magnetic part is installed on the mutual inductor shell, and the split assembly mode makes installation convenient and strong in consistency.

[0027] The utility model has relatively simple structure, convenient assembly and relatively small space occupied in the circuit breaker body, and is favorable for function expansion of the circuit breaker.

[0028] In the utility model, the magnetic release part and the inverted U-shaped armature are fixed together and can be quickly linked to move downward, achieve instantaneous tripping, realize the short-circuit instantaneous protection function of the circuit breaker, and can also be linked to reset.

[0029] In the utility model, the distance between the static magnetic part and the dynamic magnetic part can change due to shaking and the like, so in order to more accurately adjust the distance or attraction force between the static magnetic part and the dynamic magnetic part in the later period, an adjusting mechanism is arranged, the adjustable screw can be screwed up and down to compress or not compress the reset spring and the force of the reset spring, so that the distance or attraction force between the static magnetic part and the dynamic magnetic part is adjusted. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figures 1-3 It is a structure schematic view of the magnetic release device for short-circuit instantaneous protection of the preferred embodiment of the utility model.

[0031] Figure 4 It is a structure schematic view of the U-shaped yoke support of the preferred embodiment of the utility model.

[0032] Figure 5 It is a structure schematic view of the magnetic yoke of the preferred embodiment of the utility model.

[0033] Figure 6 It is a structure schematic view of the inverted U-shaped armature of the preferred embodiment of the utility model.

[0034] Figure 7 It is a structure schematic view of the magnetic release part of the preferred embodiment of the utility model.

[0035] Figure 8 The structure diagram of the spring washer of the preferred embodiment of the utility model.

[0036] Wherein, 10, mutual inductor shell;11, fixed seat;20, traction rod;21, traction block;30, conductive coupling plate;40, U-shaped yoke support;41, along the edge;42, guide groove;50, yoke;60, inverted U-shaped armature;61, convex column;62, first convex ring;70, magnetic trip unit;71, mounting plate;711, mounting hole;72, L-shaped instantaneous pull rod;80, adjusting mechanism;81, adjustable screw;82, return spring;83, spring washer;831, second convex ring;screw 90. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0038] For the convenience of description, only parts related to the utility model are shown in the drawings. The first, second and the like involved in the utility model are only for the convenience of describing the technical scheme of the utility model, and do not have a specific limiting effect, and all refer to the technical scheme of the utility model. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The terms "intermediate", "horizontal", "vertical", "longitudinal", "front", "rear", "left", "right", "inner", "outer" and the like representing the positional relationship are based on the positional relationship represented by the displayed drawings, and do not represent that the components must be presented in the position relationship expressed, and do not constitute a limiting effect on the technical scheme of the utility model.

[0039] As Figures 1-8 shown, the present embodiment provides a magnetic tripping device for short-circuit instantaneous protection, which is placed in the circuit breaker body. The circuit breaker body is provided with a mutual inductor shell 10, a traction rod 20 and a conductive coupling plate 30. The mutual inductor shell 10 is provided with a fixed seat 11. The magnetic tripping device comprises a U-shaped yoke support 40, a yoke 50, an inverted U-shaped armature 60, a magnetic tripping unit 70 and an adjusting mechanism 80. The yoke 50 serves as a static magnetic part, and the inverted U-shaped armature 60 and the magnetic tripping unit 70 together constitute a dynamic magnetic part.

[0040] In the present embodiment, when describing the position of the components, it is defined that Figure 1The position of the transformer housing 10 shown is the left side position, the opposite position is the right side position, the position directly opposite the screen is the front side position, and the position facing away from the screen is the rear side position.

[0041] The U-shaped magnetic yoke support 40, the conductive connecting plate 30 and the magnetic yoke 50 are fixedly arranged. The specific implementation manner is as follows: the U-shaped magnetic yoke support 40 is fixed on the circuit breaker base, and the magnetic yoke 50 is fixed on the U-shaped magnetic yoke support 40. In this embodiment, the magnetic yoke 50 is fixed on the top of the horizontal part of the U-shaped magnetic yoke support 40, and the screw 90 is sequentially arranged through the magnetic yoke 50 and the horizontal part of the U-shaped magnetic yoke support 40 and is screwed with the circuit breaker base, so as to realize the fixed connection of the magnetic yoke 50 with the circuit breaker base through the U-shaped magnetic yoke support 40. Of course, the magnetic yoke 50 can also be fixed on the bottom of the horizontal part of the U-shaped magnetic yoke support 40, and the screw 90 is sequentially arranged through the horizontal part of the U-shaped magnetic yoke support 40 and the magnetic yoke 50 and is screwed with the circuit breaker base, so as to realize the fixed connection of the U-shaped magnetic yoke support 40 with the circuit breaker base through the magnetic yoke 50.

[0042] In this embodiment, as shown in Figure 2 and Figure 3 , the conductive connecting plate 30 is arranged between the magnetic yoke 50 and the inverted U-shaped armature 60, and the conductive connecting plate 30 is electrically connected with the magnetic yoke 50. Of course, the conductive connecting plate 30 can also be arranged below the U-shaped magnetic yoke support 40, and the magnetic yoke 50, the U-shaped magnetic yoke support 40 and the conductive connecting plate 30 are fixed on the circuit breaker base; the conductive connecting plate 30 can also be arranged between the magnetic yoke 50 and the U-shaped magnetic yoke support 40, and the magnetic yoke 50, the conductive connecting plate 30 and the U-shaped magnetic yoke support 40 are fixed on the circuit breaker base.

[0043] The magnetic yoke 50 and the inverted U-shaped armature 60 are oppositely arranged, and the inverted U-shaped armature 60 is located directly above the magnetic yoke 50, and a travel gap is left between the magnetic yoke 50 and the inverted U-shaped armature 60, which is the distance that the inverted U-shaped armature 60 can move downward. In this embodiment, when a short-circuit current passes through the conductive connecting plate 30, a magnetic field is generated between the magnetic yoke 50 and the inverted U-shaped armature 60, and the inverted U-shaped armature 60 can trigger the traction rod 20 under the attraction of the magnetic yoke 50.

[0044] In this embodiment, in order to make the inverted U-shaped armature 60 more stable when moving up and down and not to shake, a side edge 41 is fixed on the left and right sides of each vertical part of the U-shaped magnetic yoke support 40, so that each vertical part of the U-shaped magnetic yoke support 40 and the side edge 41 form a guide groove 42; the two vertical parts of the inverted U-shaped armature 60 are respectively limited in the corresponding guide grooves 42, and the two guide grooves 42 play a vertical guiding role on the inverted U-shaped armature 60, realizing the function of limiting sliding of the moving magnetic part. The opening directions of the two guide grooves 42 can be oppositely arranged, that is, each guide groove 42 is arranged on the inner side of the corresponding vertical part, as shown in Figure 3The opening direction of the guide groove 42 on both sides can be opposite, that is, each side guide groove 42 is arranged on the outside of the corresponding vertical part.

[0045] The top of the horizontal part of the inverted U-shaped armature 60 is fixed with a magnetic tripping device 70, and the tripping end of the magnetic tripping device 70 is matched with the traction rod 20 for triggering the traction rod 20. Specifically, the magnetic tripping device 70 includes a mounting plate 71 and an L-shaped instantaneous pull rod 72, the mounting plate 71 is fixed on the top of the horizontal part of the inverted U-shaped armature 60, and the L-shaped instantaneous pull rod 72 is fixed on the side of the mounting plate 71. The L-shaped tripping end of the L-shaped instantaneous pull rod 72 is located directly above the traction block 21 of the traction rod 20, used to pull down the traction block 21, so that the traction rod 20 rotates. Of course, an L-shaped instantaneous push rod can also be provided, which can push the traction block upward, so that the traction rod 20 rotates.

[0046] The specific implementation mode that the mounting plate 71 is fixed on the top of the horizontal part of the inverted U-shaped armature 60 is that two protruding columns 61 are fixed on the top of the inverted U-shaped armature 60, mounting holes 711 matched with the protruding columns 61 are formed on the mounting plate 71, and the corresponding protruding columns 61 are inserted into the mounting holes 711 to fix the mounting plate 71 on the inverted U-shaped armature 60.

[0047] The adjusting mechanism 80 includes an adjustable screw 81, a reset spring 82 and a spring washer 83. The reset spring 82 is used as a reset member to reset the moving magnetic member, and the spring washer 83 is used as a limiting structure to limit the reset spring 82. The bottom of the adjustable screw 81 is sequentially inserted into the fixed seat 11, the mounting plate 71 and the middle position of the horizontal part of the inverted U-shaped armature 60 from top to bottom, and then is screwed with the spring washer 83. The reset spring 82 is sleeved on the adjustable screw 81, and the top of the reset spring 82 abuts against the bottom of the inverted U-shaped armature 60, and the bottom of the reset spring 82 abuts against the top of the spring washer 83. The reset spring 82 is arranged between the inverted U-shaped armature 60 and the spring washer 83, and after being compressed, the reset spring 82 can make the inverted U-shaped armature 60 and the magnetic tripping device 70 reset in linkage under the action of the restoring force.

[0048] Further, the bottom of the inverted U-shaped armature 60 is provided with a first protruding ring 62, the top of the spring washer 83 is provided with a second protruding ring 831, the top of the reset spring 82 is wound on the first protruding ring 62, and the bottom of the reset spring 83 is wound on the second protruding ring 831. The inverted U-shaped armature 60 and the first protruding ring 62 are integrally formed, and the spring washer 83 and the second protruding ring 831 are integrally formed.

[0049] The adjustable screw 81 is a cross head screw, and the cross head of the adjustable screw 81 is used to adjust the distance between the magnetic yoke 50 and the inverted U-shaped armature 60. The distance between the magnetic yoke 50 and the inverted U-shaped armature 60 can change due to shaking and other reasons, so in order to more accurately adjust the distance between the magnetic yoke 50 and the inverted U-shaped armature 60 or the attraction force later, an adjusting mechanism 80 is arranged, and the cross head of the bottom of the adjustable screw 81 can be used to twist the adjustable screw 81 up and down, for example, twisting the adjustable screw 81 upwards so that the return spring 82 is more compressed, the distance between the magnetic yoke 50 and the inverted U-shaped armature 60 is larger, and a larger attraction force is required to make the magnetic yoke 50 and the inverted U-shaped armature 60 attract, and twisting the adjustable screw 81 downwards so that the return spring 82 is less compressed or not compressed, the distance between the magnetic yoke 50 and the inverted U-shaped armature 60 is smaller, and a smaller attraction force is required to make the magnetic yoke 50 and the inverted U-shaped armature 60 attract. The embodiment adjusts the distance between the magnetic yoke 50 and the inverted U-shaped armature 60 or the attraction force by arranging the adjusting mechanism 80.

[0050] The bottom of the adjustable screw 81 can also be sequentially arranged in the middle position of the horizontal part of the inverted U-shaped armature 60, the mounting plate 71 and the fixed seat 11 from bottom to top and be threadedly connected with the fixed seat 11, at this time, the spring washer 83 is not required, and the protrusion of the adjustable screw 81 itself is used as a limiting structure for limiting the return spring 82. The top of the return spring 82 abuts against the bottom of the inverted U-shaped armature 60, and the bottom abuts against the protrusion of the adjustable screw 81. The cross head of the bottom of the adjustable screw 81 can be used to twist the adjustable screw 81 up and down, so as to adjust the distance between the magnetic yoke 50 and the inverted U-shaped armature 60 or the attraction force.

[0051] The use process of the magnetic release device in the embodiment is as follows: when the short-circuit current passes through the conductive connecting plate 30, that is, when a short-circuit fault occurs, a magnetic field is instantaneously generated between the magnetic yoke 50 and the inverted U-shaped armature 60. Under the action of the magnetic field, the inverted U-shaped armature 60 moves downwards along the two side guide grooves 42 of the U-shaped yoke bracket 40 and is attracted to the magnetic yoke 50. In the process of the downward movement and attraction of the inverted U-shaped armature 60, the magnetic release member 70 is driven to move, the L-shaped release end of the L-shaped instantaneous pull rod 72 of the magnetic release member 70 pulls the traction block 21 of the traction rod 20 downwards, the traction rod 20 rotates, drives the operating mechanism of the circuit breaker to release, thereby achieving instantaneous opening and realizing the short-circuit instantaneous protection function of the circuit breaker. In the process of the downward movement of the inverted U-shaped armature 60, the return spring 82 is compressed at the same time; after opening, the inverted U-shaped armature 60 and the magnetic release member 70 are reset under the action of the restoring force of the return spring 82. As for the fact that the traction rod 20 drives the operating mechanism of the circuit breaker to release, it is prior art, and will not be described here. Even if the technical scheme of the embodiment is not described, it is clear.

[0052] The embodiment also provides a circuit breaker, which comprises the three magnetic tripping devices described above, corresponding to three phases of ABC respectively, and the magnetic tripping parts 70 of the three magnetic tripping devices correspond to the three traction blocks 21 on the traction rod 20 one by one. When the L-shaped tripping end of the L-shaped instantaneous pull rod 72 of any one magnetic tripping part 70 pulls down the traction block 21 of the traction rod 20, instantaneous opening can be achieved, and the short-circuit instantaneous protection function of the circuit breaker is realized.

[0053] Although the specific embodiments of the present application are described above, those skilled in the art should understand that these are only illustrative, the protection scope of the present application is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present application, but these changes and modifications all fall within the protection scope of the present application.

Claims

1. A magnetic trip unit for short circuit instantaneous protection, placed inside a circuit breaker body, said circuit breaker body being provided with a transformer housing, a drag lever and a conductive link plate, characterized in that, The magnetic tripping device comprises a static magnetic part and a dynamic magnetic part; The static magnetic part is mounted on the conductive connecting plate, the dynamic magnetic part is movably mounted on a fixed seat of the transformer housing, a reset part for resetting the dynamic magnetic part is arranged on the fixed seat, the static magnetic part and the dynamic magnetic part are oppositely arranged, and the dynamic magnetic part can trigger the traction rod under the attraction of the static magnetic part.

2. The magnetic trip unit for short circuit instantaneous protection of claim 1, wherein, The magnetic tripping device further comprises a static magnetic support, and the static magnetic support, the conductive connecting plate and the static magnetic part are fixedly arranged.

3. A magnetic trip unit for short circuit instantaneous protection according to claim 2, characterized in that, The static magnetic part is fixed on the top of the static magnetic support, and the static magnetic part is fixedly connected with the circuit breaker base through the static magnetic support. Alternatively, the static magnetic part is fixed on the bottom of the static magnetic support, and the static magnetic support is fixedly connected with the circuit breaker base through the static magnetic part.

4. The magnetic trip unit for short circuit instantaneous protection of claim 2, wherein, The conductive connecting plate is mounted below the static magnetic support, between the static magnetic part and the static magnetic support, or between the static magnetic part and the dynamic magnetic part.

5. The magnetic trip unit for short circuit instantaneous protection of claim 2, wherein, The static magnetic part is a magnetic yoke, and the static magnetic support is a U-shaped magnetic yoke support. Each vertical part of the U-shaped magnetic yoke support is fixed with a side along the edge, so that each vertical part and the side along the edge of the U-shaped magnetic yoke support form a guide groove.

6. The magnetic trip unit for short circuit instantaneous protection of claim 5, wherein, The dynamic magnetic part comprises an inverted U-shaped armature, the inverted U-shaped armature is located directly above the magnetic yoke, and the two vertical sides of the inverted U-shaped armature are respectively limited in the corresponding guide grooves.

7. A magnetic trip unit for short circuit instantaneous protection according to claim 6, characterized in that, The dynamic magnetic part further comprises a magnetic tripping part, the magnetic tripping part is fixed on the horizontal part of the inverted U-shaped armature, and the tripping end of the magnetic tripping part is matched with the traction rod.

8. The magnetic trip unit for short circuit instantaneous protection of claim 7, wherein, The magnetic tripping part comprises a mounting plate and an L-shaped instantaneous pull rod, the mounting plate is fixed on the horizontal part of the inverted U-shaped armature, the L-shaped instantaneous pull rod is fixed on the side of the mounting plate, and the L-shaped tripping end of the L-shaped instantaneous pull rod is located directly above the traction block of the traction rod.

9. The magnetic trip unit for short circuit instantaneous protection of claim 1, wherein, The magnetic tripping device further comprises an adjusting mechanism, the adjusting mechanism comprises an adjustable screw, a reset part and a limiting structure, the top of the adjustable screw is fixedly provided in the fixed seat, the dynamic magnetic part and the reset part are sleeved on the adjustable screw, the bottom of the adjustable screw is fixed with the limiting structure, the top of the reset part abuts against the bottom of the dynamic magnetic part, and the bottom of the reset part abuts against the top of the limiting structure.

10. A circuit breaker characterized by, The magnetic tripping device comprises the magnetic tripping device according to any one of claims 1-9.

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