Undervoltage release

Abstract

The utility model discloses an under-voltage release, and belongs to the technical field of circuit breakers. Comprising a base, a coil assembly, a magnet yoke and a transmission mechanism, the transmission mechanism comprises a static iron core, a movable iron core and an elastic piece acting on the movable iron core to enable the movable iron core to reset, the movable iron core is provided with a first plane and a first inclined face, the static iron core is provided with a second plane and a second inclined face, and when the static iron core and the movable iron core are attracted, the first plane and the second inclined face are separated. The first plane and the second plane are attached to each other, and at the moment, a gap is formed between the first inclined face and the second inclined face. The circuit breaker has the advantages that on the basis that the stroke of the movable iron core is not changed, the proper gap is arranged between the first inclined plane and the second inclined plane, the movable iron core and the static iron core can be reliably attracted during undervoltage, and therefore effective closing of the circuit breaker is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of circuit breaker, specifically relates to an under-voltage release. BACKGROUND

[0002] The under-voltage release is a very important accessory of the circuit breaker, and when an under-voltage fault occurs in the system line where the under-voltage release is located, the under-voltage release operates to trip the circuit breaker. The structure of the under-voltage release usually comprises a base, a pull rod, a magnetic yoke, a coil, a coil framework, a moving iron core, a static iron core, a counterforce spring, a guide shaft and electronic components. When the coil of the under-voltage release is connected to 85% to 110% rated voltage, the current flowing through the coil generates a certain size of electromagnetic attraction force, which overcomes the spring force to make the static iron core attract the moving iron core, and the moving iron core drives the pull rod to operate, so that the pull rod is in a position close to the static iron core. At this time, if the under-voltage release is installed in the circuit breaker, the pull rod is away from the pulling rod position, and will not affect the normal closing and opening operation of the circuit breaker. However, when the under-voltage is lost or the voltage is as low as 70% to 35% rated voltage, the attraction force between the moving iron core and the static iron core decreases, and the moving iron core will be separated from the static iron core under the action of the counterforce spring, and the pull rod strikes the pulling rod of the circuit breaker to trip the circuit breaker. In the prior art, as shown in the figure, the maximum gap δ of the gap 10 between the moving iron core 43 and the static iron core 42 is always synchronized with the stroke h of the moving iron core 43. In this structure, the attraction force of the moving iron core 43 and the static iron core 42 is relatively small when the maximum air gap, which may lead to unreliable under-voltage attraction and cause the circuit breaker to fail to close. Figure 1

[0003] In view of the above prior art, it is necessary to improve the structure of the existing under-voltage release. Therefore, the applicant has made a beneficial design, and the technical scheme to be introduced below is generated in this background. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at providing an under-voltage release which sets a proper gap between the first inclined surface of the moving iron core and the second inclined surface of the static iron core to ensure reliable under-voltage attraction without changing the stroke of the moving iron core.

[0005] The utility model aims at providing an under-voltage release which sets a proper gap between the first inclined surface of the moving iron core and the second inclined surface of the static iron core to ensure reliable under-voltage attraction without changing the stroke of the moving iron core.

[0006] ​In one specific embodiment of the utility model, the gap is set to 0.1mm-0.5mm.

[0007] In another specific embodiment of the utility model, the first plane and the first inclined plane are set to an obtuse angle, and the second plane and the second inclined plane are set to an obtuse angle.

[0008] In still another specific embodiment of the utility model, the transmission mechanism further comprises a guide shaft, and the static iron core and the dynamic iron core are provided with through holes corresponding to each other in the middle along the axial direction for the guide shaft to pass through.

[0009] In still another specific embodiment of the utility model, the axial center lines of the static iron core and the dynamic iron core are on the same straight line.

[0010] In still another specific embodiment of the utility model, the elastic member is a spring.

[0011] In still another specific embodiment of the utility model, the magnetic yoke comprises an upper magnetic yoke and a lower magnetic yoke, the upper magnetic yoke is fixedly arranged on the lower magnetic yoke, and the upper magnetic yoke and the lower magnetic yoke cooperate to form a containing space, and the coil assembly is arranged in the containing space.

[0012] In still another specific embodiment of the utility model, the transmission mechanism further comprises a pull rod assembly, the pull rod assembly is fixedly arranged on the upper end of the dynamic iron core and moves synchronously with the dynamic iron core.

[0013] In still another specific embodiment of the utility model, the pull rod assembly comprises a pull rod, a guide rod and a fixing member, the pull rod is fixedly arranged on the dynamic iron core through the fixing member, the pull rod is further provided with a guide hole, one end of the guide rod is fixedly arranged on the upper magnetic yoke, the other end passes through the guide hole, the pull rod is further provided with an output end, when the suction force between the dynamic iron core and the static iron core decreases, the dynamic iron core is separated from the static iron core under the action of the elastic member, the output end of the pull rod strikes the traction rod of the circuit breaker, and the circuit breaker is tripped.

[0014] Compared with the prior art, the utility model has the beneficial effects that: on the basis of not changing the stroke of the dynamic iron core, proper gaps are arranged between the first inclined plane and the second inclined plane, the dynamic iron core and the static iron core can be reliably attracted under voltage shortage, so that the circuit breaker is effectively closed; the first plane and the first inclined plane are set to an obtuse angle, and the second plane and the second inclined plane are set to an obtuse angle, so that the first inclined plane and the second plane can be prevented from being in contact in advance and affecting the attraction of the dynamic iron core and the static iron core. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structural schematic view of the prior art.

[0016] Figure 2 Figure 3 is a structural schematic view of the utility model when the moving iron core and the static iron core are separated;

[0017] Figure 3 Figure 4 is a structural schematic view of the utility model when the moving iron core and the static iron core are attracted;

[0018] Figure 4 Figure 5 is an exploded view of the overall structure of the utility model.

[0019] In the figure: 1. base; 2. coil assembly, 21. coil skeleton, 22. coil; 3. magnetic yoke, 31. upper magnetic yoke, 32. lower magnetic yoke; 4. transmission mechanism, 41. guide shaft, 42. static iron core, 421. second plane, 422. second inclined plane, 43. moving iron core, 431. first plane, 432. first inclined plane, 44. elastic piece, 45. pull rod assembly, 451. pull rod, 4511. guide hole, 4512. output end, 452. guide rod, 453. fixing piece; 10. gap. DETAILED DESCRIPTION

[0020] The specific embodiments of the utility model are described in detail below in combination with the drawings, but the description of the embodiments is not a limitation on the technical solutions, and any form but not substantial changes according to the concept of the utility model should be regarded as the protection scope of the utility model.

[0021] In the following description, the concepts of directionality (or directionality) of up, down, left, right, front and back are for the position state of the figure being described, and the purpose is to facilitate the public to understand, so it cannot be understood as a special limitation on the technical solutions provided by the utility model.

[0022] See Figure 2 And Figure 3 The utility model relates to a kind of under voltage release, including base 1, the base 1 is formed with a cavity, coil assembly 2 is provided in the cavity, coil assembly 2 is provided with magnetic yoke 3 on the upper and lower sides, a transmission mechanism 4 passes through coil assembly 2.Specifically, the coil assembly 2 includes coil skeleton 21 and coil 22 wound on coil skeleton 21.The magnetic yoke 3 includes upper magnetic yoke 31 and lower magnetic yoke 32, the lower magnetic yoke 32 is U-shaped, the upper magnetic yoke 31 is a character type, the upper magnetic yoke 31 is fixedly arranged on lower magnetic yoke 32, the upper magnetic yoke 31 and lower magnetic yoke 32 cooperate and are surrounded to form a containing space, and the coil assembly 2 is arranged in the containing space.

[0023] The transmission mechanism 4 comprises a guide shaft 41, a static iron core 42, a dynamic iron core 43 and an elastic member 44 acting on the dynamic iron core 43 to reset it. One end of the guide shaft 41 abuts against the dynamic iron core 43 and moves synchronously with the dynamic iron core 43. The elastic member 44 is arranged between the static iron core 42 and the dynamic iron core 43 and is sleeved on the guide shaft 41, and is used to provide an upward force of the dynamic iron core 43. In the embodiment, the elastic member 44 is a spring. The dynamic iron core 43 is provided with a first plane 431 and a first inclined plane 432, and the static iron core 42 is provided with a second plane 421 and a second inclined plane 422. Specifically, in the embodiment, the first plane 431 and the first inclined plane 432 constitute a convex part, and the second plane 421 and the second inclined plane 422 constitute a concave part, and the shapes, sizes and dimensions of the convex part and the concave part are mutually matched. Of course, the first plane 431 and the first inclined plane 432 can also constitute a concave part, and correspondingly, the second plane 421 and the second inclined plane 422 constitute a convex part.

[0024] Further, the first plane 431 is a dynamic iron core attraction surface, and the second plane 421 is a static iron core attraction surface. When the static iron core 42 and the dynamic iron core 43 are attracted, the first plane 431 and the second plane 421 are mutually attached, and at this time, a gap 10 is formed between the first inclined plane 432 and the second inclined plane 422. The first plane 431 and the first inclined plane 432 are arranged at an obtuse angle, and the second plane 421 and the second inclined plane 422 are arranged at an obtuse angle, so that the first inclined plane 432 and the second plane 421 can be prevented from being in contact in advance, and the attraction of the dynamic iron core 43 and the static iron core 42 is affected. At the same time, on the basis of not changing the stroke h of the dynamic iron core 43, the appropriate gap 10 is arranged, so as to ensure that the dynamic iron core 43 and the static iron core 42 can be reliably attracted under an under-voltage, so as to ensure that the circuit breaker effectively closes. The gap 10 is arranged to be 0.1mm-0.5mm, and appropriate size parameters can be selected in the range according to use requirements.

[0025] See Figure 4The transmission mechanism 4 further comprises a pull rod assembly 45 fixedly arranged at the upper end of the moving iron core 43 and capable of moving synchronously with the moving iron core 43. Specifically, the pull rod assembly 45 comprises a pull rod 451, a guide rod 452 and a fixing member 453. The pull rod 451 is fixedly arranged on the moving iron core 43 through the fixing member 453. The pull rod 451 is provided with a mounting hole, and the fixing member 453 is fixed through the mounting hole and a through hole arranged at the upper end of the moving iron core 43. In this embodiment, the fixing member 453 is a screw. The pull rod 451 is further provided with a guide hole 4511, one end of the guide rod 452 is fixedly arranged on the upper magnetic yoke 31, and the other end penetrates through the guide hole 4511. The guide hole 4511 is preferably a waist-shaped hole, thereby effectively reducing the friction between the pull rod 451 and the guide rod 452 during movement. The pull rod 451 is further provided with an output end 4512. When the suction force between the moving iron core 43 and the static iron core 42 decreases, the moving iron core 43 is separated from the static iron core 42 under the action of the elastic member 44, the output end 4512 of the pull rod 451 strikes the traction rod, and the circuit breaker is tripped.

Claims

1. An under-voltage release comprising a base (1), a coil assembly (2) arranged in the base (1), a magnetic yoke (3) arranged outside the coil assembly (2), and a transmission mechanism (4) passing through the coil assembly (2), the transmission mechanism (4) comprising a static core (42), a dynamic core (43), and a resilient member (44) acting on the dynamic core (43) to reset the dynamic core (43), the dynamic core (43) being provided with a first flat surface (431) and a first inclined surface (432), and the static core (42) being provided with a second flat surface (421) and a second inclined surface (422), characterized in that: the first flat surface (431) and the second flat surface (421) are arranged in parallel to each other, and the first inclined surface (432) and the second inclined surface (422) are arranged in parallel to each other. When the static iron core (42) and the dynamic iron core (43) are attracted, the first plane (431) and the second plane (421) are attached to each other, and at this time, the first inclined surface (432) and the second inclined surface (422) form a gap (10) therebetween.

2. An under-voltage release according to claim 1, characterised in that: The gap (10) is set to 0.1mm-0.5mm.

3. An under-voltage release according to claim 1, characterized in that: The first plane (431) and the first inclined surface (432) are set at an obtuse angle, and the second plane (421) and the second inclined surface (422) are set at an obtuse angle.

4. An under-voltage release according to claim 1, characterized in that: The transmission mechanism (4) further comprises a guide shaft (41), and the static iron core (42) and the dynamic iron core (43) are correspondingly provided with through holes for the guide shaft (41) to pass through in the middle.

5. An under-voltage release according to claim 1, characterized in that: The static iron core (42) and the dynamic iron core (43) are coaxial.

6. An under-voltage relay according to claim 1, characterized in that: The elastic member (44) is a spring.

7. An under-voltage release according to claim 1, characterized in that: The magnetic yoke (3) comprises an upper magnetic yoke (31) and a lower magnetic yoke (32), the upper magnetic yoke (31) is fixedly arranged on the lower magnetic yoke (32), and cooperates with the lower magnetic yoke (32) to form a containing space, and the coil assembly (2) is arranged in the containing space.

8. An under-voltage release according to claim 7, characterised in that: The transmission mechanism (4) further comprises a pull rod assembly (45), and the pull rod assembly (45) is fixedly arranged on the upper end of the dynamic iron core (43) and moves synchronously with the dynamic iron core (43).

9. An under-voltage release according to claim 8, characterised in that: The pull rod assembly (45) comprises a pull rod (451), a guide rod (452) and a fixing member (453), the pull rod (451) is fixedly arranged on the dynamic iron core (43) through the fixing member (453), the pull rod (451) is further provided with a guide hole (4511), one end of the guide rod (452) is fixedly arranged on the upper magnetic yoke (31), and the other end passes through the guide hole (4511), the pull rod (451) is further provided with an output end (4512), when the attraction between the dynamic iron core (43) and the static iron core (42) decreases, the dynamic iron core (43) is separated from the static iron core (42) under the action of the elastic member (44), the output end (4512) of the pull rod (451) strikes the traction rod of the circuit breaker, so that the circuit breaker is tripped.

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