Oil-immersed circuit breaker with multi-pole modular structure

Abstract

The utility model discloses an oil-immersed circuit breaker with a multi-pole modular structure, which comprises a plurality of circuit breaker units arranged side by side, two limit tripping plates of two adjacent circuit breaker units are connected through a transmission assembly, and the transmission assembly comprises two draw bars fixedly connected with the two limit tripping plates respectively. The linkage piece is detachably connected between the two traction rods, and the linkage piece and the two traction rods are connected through a hole shaft structure or a key structure to form coaxial linkage fit. By adopting the technical scheme, a plurality of circuit breaker units only need to select the traction rods of the same specification, the installation structure is simple, the universality is good, the purposes of reducing the management cost and the raw material cost are achieved, the corresponding number of circuit breaker units are selected according to the number of poles of the oil-immersed circuit breaker to realize quick assembly or disassembly, and the production efficiency is improved. And the installation effect of debugging, checking and reassembling the independent module units is achieved, the assembling efficiency is improved, and the use performance of the product is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to an oil-immersed circuit breaker with a multi-pole modular structure. Background Art

[0002] Oil-immersed circuit breakers are electrical switchgear that utilize high-insulation oil as a dielectric medium. In power systems, oil-immersed circuit breakers are primarily used to protect and control power transmission and distribution networks. They interrupt and isolate fault currents in circuits, protecting electrical equipment and personnel. When operating normally, circuit breakers can close or open the power supply circuit to interrupt power, provide power, or switch circuits.

[0003] Existing oil-immersed circuit breaker products can be divided into single-pole and multi-pole specifications. Multi-pole circuit breakers are assembled from multiple single-pole circuit breaker units. Each pole circuit breaker unit is composed of a casing, a conductive system, a contact mechanism, a tripping mechanism, etc. This oil-immersed circuit breaker drives the traction rod through the tripping mechanism to trigger the contact mechanism to perform a tripping and opening action. That is, when the tripping mechanism of any pole circuit breaker unit trips, the traction rod triggers the contact mechanisms of other pole circuit breakers to perform tripping and opening synchronously. However, depending on the number of poles of the circuit breaker, or when switching from a multi-pole circuit breaker to a single-pole circuit breaker, traction rods of different specifications and lengths need to be selected, which results in high inventory pressure, cumbersome installation, poor versatility, increased production costs, and affected product performance. Utility Model Content

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the problem in the prior art that oil-immersed circuit breakers require different specifications and lengths of traction rods according to the number of poles, which is cumbersome to install, has poor versatility, places great inventory pressure, and increases production costs.

[0005] To solve the above technical problems, the utility model provides a multi-pole modular oil-immersed circuit breaker, comprising a plurality of circuit breaker units arranged side by side, wherein the circuit breaker units include a circuit breaker housing and a limit trip plate rotatably arranged on the circuit breaker housing, and a contact mechanism that forms a limit fit with the limit trip plate. The two limit trip plates of two adjacent circuit breaker units are connected by a transmission assembly, and the transmission assembly includes two traction rods fixedly connected to the two limit trip plates and extending coaxially, and a linkage member detachably connected between the two traction rods. A connecting groove is provided between the two circuit breaker housings for the linkage member and the traction rod to pass through. The linkage member is connected to the two traction rods by a hole-shaft structure or a key structure to form a coaxial linkage fit.

[0006] The hole shaft structure comprises a connecting shaft arranged at two ends of the linkage member and a connecting hole arranged at two ends of the traction rod respectively, and the connecting shaft and the traction rod are connected by the connecting shaft and the connecting hole.

[0007] The connecting shaft is a regular polygon shaft structure, and the connecting hole is a regular polygon hole structure.

[0008] The key structure comprises a spline block arranged at two ends of the linkage member and a spline groove arranged at two ends of the traction rod respectively, and the linkage member and the traction rod are connected by the spline block and the spline groove.

[0009] The connecting groove is a U-shaped groove arranged at one end of the two circuit breaker housings along the axial direction of the traction rod, and the linkage member and the two traction rods are movably arranged in the connecting groove.

[0010] The reset spring is arranged between the traction rod and the connecting groove.

[0011] The bottom side wall of the connecting groove is provided with a positioning block, the traction rod is correspondingly provided with a positioning hole opposite to the positioning block, and the two ends of the reset spring are connected to the positioning block and the positioning hole respectively.

[0012] The limit trip plate is provided with a U-shaped support extending into the connecting groove at one end, and the traction rod is fixedly connected to the U-shaped support.

[0013] The contact mechanism comprises a movable support rotatably arranged in the circuit breaker housing, a movable contact arranged on the movable support, and an operating assembly driving the movable support to move for opening and closing, a trip spring is arranged between the movable support and the circuit breaker housing, the limit trip plate is provided with a limit clamping groove on the side facing the movable support, and the upper end of the movable support away from the movable contact is connected to the limit clamping groove to form a limit fit.

[0014] The operating assembly comprises a handle slider moving in a circular arc trajectory on the circuit breaker housing, and a transmission link and a transmission spring connected between the movable support and the handle slider, a guide groove slidingly connecting the transmission link and a sliding groove slidingly connecting the handle slider are arranged in the circuit breaker housing, and at least one sliding convex rib is arranged on the arc-shaped bottom surface of the handle slider and in contact with the side wall of the sliding groove.

[0015] Compared with the prior art, the technical solution of this utility model has the following advantages:

[0016] 1. In the multi-pole modular oil-immersed circuit breaker provided by the present invention, the oil-immersed circuit breaker is assembled from multiple circuit breaker units. During assembly, the two limit trip plates of two adjacent circuit breaker units are connected to a linkage member via two traction rods to achieve linkage cooperation. The linkage member and the two traction rods are connected by a hole-shaft structure or a key structure to achieve a coaxial linkage arrangement, thereby achieving the effect of synchronous tripping and opening of the multiple circuit breaker units. The advantage of this design is that multiple circuit breaker units only need to select traction rods of the same specification, and the multiple traction rods are connected in series through the linkage member to achieve linkage arrangement between the multiple limit trip plates. This installation structure is simple and has good installation versatility, reduces the inventory backlog of parts, facilitates inventory management and production management, and thus achieves the purpose of reducing management costs and raw material costs. In this way, the corresponding number of circuit breaker units can be selected according to the number of poles of the oil-immersed circuit breaker to achieve rapid assembly or disassembly, improve assembly efficiency, better adapt to on-site installation requirements, flexible installation and use, and enhance product performance.

[0017] 2. In the multi-pole modular oil-immersed circuit breaker provided by the present invention, the handle slider drives the movable bracket to perform opening and closing movements when it slides back and forth, thereby achieving contact or separation between the moving and static contacts. By providing sliding ribs on the bottom surface of the handle slider that contact the side walls of the slide groove, this helps to reduce the contact area between the handle slider and the side walls of the slide groove, thereby reducing frictional resistance, making the movement of the handle slider smoother and the operation easier and more labor-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is a schematic diagram of the three-dimensional structure of the multi-pole modular oil-immersed circuit breaker of the utility model;

[0020] Figure 2 This is a schematic diagram of the internal structure of the multi-pole modular oil-immersed circuit breaker of the utility model;

[0021] Figure 3 for Figure 2 The schematic diagram of the planar structure of the oil-immersed circuit breaker is shown;

[0022] Figure 4The utility model discloses a traction rod and linkage's connection structure schematic view.

[0023] Figure 5 The utility model discloses a traction rod and linkage's split structure schematic view.

[0024] Figure 6 The utility model discloses a handle slider structure schematic view.

[0025] Mark explanation: 1, limit tripping plate;11, U-shaped support;12, limit card slot;2, traction rod;21, coupling hole;3, linkage;31, coupling shaft;4, connecting groove;5, reset spring;6, tripping mechanism;7, contact mechanism;71, movable support;72, movable contact;73, static contact;74, opening spring;75, handle slider;76, sliding convex rib;77, transmission connecting rod;78, transmission spring;79, guide slot;8, circuit breaker unit;81, circuit breaker shell. DETAILED DESCRIPTION

[0026] The technical scheme of the utility model will be described clearly and completely below in connection with the drawings, and obviously, the described embodiments are a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without making creative efforts belong to the protection scope of the utility model.

[0027] In the description of the utility model, it is necessary to explain that the terms "first", "second", "third" are only for the purpose of description, and can not be understood as indicating or implying relative importance.

[0028] In the description of the utility model, it is necessary to explain that, unless there is explicit provision and limitation, the terms "installation", "connection", "connection" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected;Can be mechanical connection, can also be electrical connection;Can be directly connected, can also be indirectly connected through intermediate medium, can be the communication of two elements inside. For the person skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0029] EMBODIMENT

[0030] The embodiment provides a kind of as Figure 1-6A multi-pole modular oil-immersed circuit breaker is shown, comprising a plurality of circuit breaker units 8 arranged side by side. The circuit breaker units 8 include a circuit breaker housing 81 and a limit trip plate 1 rotatably mounted on the circuit breaker housing 81, a contact mechanism 7 that forms a limit fit with the limit trip plate 1, and a trip mechanism 6 for driving the limit trip plate 1 to rotate to release the limit fit. The contact mechanism 7 performs a tripping and opening action after releasing the limit fit with the limit trip plate 1. The two limit trip plates 1 of two adjacent circuit breaker units 8 are connected by a transmission assembly. The transmission assembly includes two traction rods 2 that are respectively fixedly connected to the two limit trip plates 1 and extend coaxially, and a linkage member 3 that is detachably connected between the two traction rods 2. A connecting groove 4 is provided between the two circuit breaker housings 81, through which the linkage member 3 and the traction rod 2 can pass. The linkage member 3 is connected to the two traction rods 2 by a hole-shaft structure or a key structure to form a coaxial linkage fit.

[0031] The above embodiment is the core technical solution of this embodiment. The oil-immersed circuit breaker according to the multi-pole modular structure is assembled from a plurality of circuit breaker units 8. During assembly, the two limit trip plates 1 of two adjacent circuit breaker units 8 are connected to the linkage member 3 through two traction rods 2 to achieve linkage cooperation. The linkage member 3 and the two traction rods 2 adopt a hole-axis structure or a key structure to achieve a coaxial linkage setting, so that the multiple circuit breaker units 8 can achieve the effect of synchronous tripping and opening. The advantage of this design is that multiple circuit breaker units 8 can be assembled by selecting the same specification of traction rods 2, and multiple circuit breaker units can be connected by the linkage member 3. The traction rods 2 are connected in series in sequence to realize the linkage setting between multiple limit trip plates 1. This installation structure is simple and has good installation versatility, reduces the backlog of parts inventory, facilitates inventory management and production management, and thus achieves the purpose of reducing management costs and raw material costs. The oil-immersed circuit breaker of this embodiment adopts a modular structure with an independent module unit for debugging, verification and then assembly. In this way, the corresponding number of circuit breaker units can be selected according to the number of poles of the oil-immersed circuit breaker to achieve rapid assembly or disassembly, improve assembly efficiency, better adapt to on-site installation requirements, flexible installation and use, and improve product performance.

[0032] The following combination Figure 2-5 Detailed description of the specific setting of the drawbar and linkage:

[0033] As a preferred embodiment, the traction rod 2 and the linkage member 3 adopt a hole-axis structure to achieve linkage cooperation. Specifically, the hole-axis structure includes a connecting shaft 31 arranged at both ends of the linkage member 3, and connecting holes 21 respectively arranged at both ends of the two traction rods 2. The connecting shaft and the traction rod 2 are connected by plugging into the connecting shaft 31 and the connecting hole 21. The connecting shaft is a regular polygonal shaft structure, and is preferably a square shaft; the connecting hole 21 is a regular polygonal hole structure, and is preferably a square hole. With this structural setting, the traction rod 2 and the linkage member 3 are linked together through the cooperation of the square shaft and the square hole, and then the torque is transmitted between the two adjacent traction rods 2 through the linkage member 3. How to realize the linkage setting of multiple traction rods 2 of multiple circuit breaker units 8, installation and disassembly are relatively convenient, and the assembly efficiency of the oil-immersed circuit breaker with a multi-pole modular structure is improved.

[0034] As an alternative embodiment, the traction rod 2 and the linkage member 3 utilize a key structure to achieve linkage. Specifically, the key structure includes spline blocks provided at both ends of the linkage member 3 and spline grooves provided at both ends of the two traction rods 2. The linkage member 3 and the traction rod 2 are connected by the spline blocks and the spline grooves. With this structural arrangement, the traction rod 2 and the linkage member 3 achieve torque transmission through the spline structure, and can also achieve linkage between multiple traction rods of multiple circuit breaker units 8. Those skilled in the art will be able to select the specific arrangement of the traction rod and the linkage member based on the above description, and other equivalent embodiments will not be described in detail here.

[0035] In this embodiment, if Figure 2-3 As shown, the connecting groove 4 is a U-shaped groove extending along the axial direction of the traction rod 2 and arranged at one end of the two circuit breaker housings 81. The linkage member 3 and the two traction rods 2 are movably arranged in the connecting groove 4. The connecting groove 4 with such a U-shaped structure has an open opening on one side, which is convenient for installing the traction rod 2 and the linkage member 3 in the connecting groove 4 without occupying the internal space of the circuit breaker. In this way, the traction rod 2 and the linkage member 3 can be assembled without disassembling the circuit breaker housing 81, which is convenient for installation and disassembly, and is conducive to improving assembly efficiency.

[0036] Combine Figure 4-5As shown, one end of the limit tripping plate 1 is provided with a U-shaped support extending into the connecting groove 4, the traction rod 2 is fixedly connected on the U-shaped support through screws, the linkage 3 is inserted at one end of the traction rod 2, and then the two circuit breaker units 8 are assembled together, so that the two traction rods 2 are linked and matched through the linkage 3. The tripping mechanism 6 in the embodiment includes a short-circuit tripping structure and an overload tripping structure arranged in the circuit breaker. When the circuit breaker has a short-circuit or overload fault, the tripping mechanism 6 is triggered to drive the limit plate to rotate. After the limit tripping plate 1 is driven by the tripping mechanism 6 to rotate, the limit matching between the limit tripping plate 1 and the contact mechanism 7 is released, so as to trigger the contact mechanism 7 to perform a tripping and opening action, thereby realizing the tripping and opening of the circuit breaker. In order to reset the limit tripping plate 1 to the initial position, the reset spring 5 is arranged between the traction rod 2 and the connecting groove 4. The bottom side wall of the connecting groove 4 is provided with a positioning block, and the traction rod 2 is correspondingly provided with a positioning hole opposite to the positioning block. The two ends of the reset spring 5 are connected to the positioning block and the positioning hole, respectively. In this way, the reset spring 5 is positioned and connected between the traction rod 2 and the connecting groove 4. The limit tripping plate 1 can be reset and rotated by the elastic force of the reset spring 5.

[0037] In combination Figure 2-3 As shown, the contact mechanism 7 includes a movable support 71 rotatably arranged in the circuit breaker housing 81, a movable contact 72 arranged on the movable support 71, an operating assembly driving the movable support 71 to perform opening and closing actions, a static contact 73 arranged in the housing and matched with the movable contact 72, and an opening spring 74 arranged between the movable support 71 and the circuit breaker housing 81. One side of the limit tripping plate 1 facing the movable support 71 is provided with a limit clamping groove 12, and the upper end of the movable support 71 away from the movable contact 72 is connected in the limit clamping groove 12 to form a limit matching. According to the structure, when the contact mechanism 7 drives the movable contact 72 to contact the static contact 73 to be in a closed state, the opening spring 74 is stretched and stored. Therefore, when the limit tripping plate 1 is driven by the tripping mechanism 6 to rotate away from the movable support 71, the limit tripping plate 1 and the movable support 71 are separated from each other. At this time, the contact mechanism 7 performs a tripping and opening action under the spring force released by the opening spring 74, so as to realize the separation of the movable contact and the static contact.

[0038] Further preferably, refer to Figure 3 and Figure 6The operating assembly includes a handle slider 75 that moves in a circular arc trajectory on the circuit breaker housing 81, and a transmission connecting rod 77 and a transmission spring 78 connected between the movable bracket 71 and the handle slider 75. A guide groove 79 for slidingly connecting the transmission connecting rod and a slide groove for slidingly connecting the handle slider are provided in the circuit breaker housing. One end of the transmission connecting rod 77 is hinged to the movable bracket 71, and the other end is provided with a transmission shaft connected to the transmission spring 78. When the transmission connecting rod 77 is driven, it moves in a triangular trajectory along the guide groove 79, thereby causing the movable bracket 71 to swing a certain angle. In addition, two sliding ribs 76 that cooperate with the side walls of the slide groove are provided on the arc bottom surface of the handle slider 75. With this structural arrangement, the handle slider 75 drives the movable bracket 71 to perform opening and closing movements when it slides back and forth, thereby achieving contact or separation between the moving and static contacts. By providing a sliding rib 76 on the bottom surface of the handle slider 75 that contacts the side wall of the slide groove, this helps to reduce the contact area between the handle slider and the side wall of the slide groove, thereby reducing friction resistance, making the movement of the handle slider smoother and the operation easier and more labor-saving.

[0039] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A multi-pole modular oil-immersed circuit breaker, comprising a plurality of circuit breaker units (8) arranged side by side, wherein the circuit breaker unit (8) comprises a circuit breaker housing (81), a limit trip plate (1) rotatably arranged on the circuit breaker housing (81), and a contact mechanism (7) forming a limit fit with the limit trip plate (1), characterized in that: The two limit trip plates (1) of two adjacent circuit breaker units (8) are connected via a transmission assembly, the transmission assembly comprising two traction rods (2) respectively fixedly connected to the two limit trip plates (1) and extending coaxially, and a linkage member (3) detachably connected between the two traction rods (2), and a connecting groove (4) for the linkage member (3) and the traction rod (2) to pass through is provided between the two circuit breaker housings (81), and the linkage member (3) and the two traction rods (2) are connected via a hole-shaft structure or a key structure to form a coaxial linkage fit.

2. The multi-pole modular oil-immersed circuit breaker according to claim 1, characterized in that: The hole-shaft structure comprises a connecting shaft (31) provided at both ends of the linkage member (3), and connecting holes (21) respectively provided at both ends of the two traction rods (2); the connecting shaft and the traction rod (2) are connected by plugging together the connecting shaft (31) and the connecting hole (21).

3. The multi-pole modular oil-immersed circuit breaker according to claim 2, characterized in that: The connecting shaft (31) is a regular polygonal shaft structure, and the connecting hole (21) is a regular polygonal hole structure.

4. The multi-pole modular oil-immersed circuit breaker according to claim 1, characterized in that: The key structure comprises spline blocks arranged at both ends of the linkage member (3) and spline grooves respectively arranged at both ends of the two traction rods (2); the linkage member (3) and the traction rod (2) are connected by plugging the spline blocks into the spline grooves.

5. The multi-pole modular oil-immersed circuit breaker according to any one of claims 1 to 4, characterized in that: The connecting groove (4) is a U-shaped groove extending along the axial direction of the traction rod (2) and arranged at one end of the two circuit breaker housings (81); the linkage member (3) and the two traction rods (2) are movably arranged in the connecting groove (4).

6. The multi-pole modular oil-immersed circuit breaker according to claim 5, characterized in that: A return spring (5) is provided between the traction rod (2) and the connecting groove (4).

7. The multi-pole modular oil-immersed circuit breaker according to claim 6, characterized in that: A positioning block is provided on the bottom side wall of the connecting groove (4), a positioning hole opposite to the positioning block is correspondingly provided on the traction rod (2), and two ends of the reset spring (5) are respectively connected to the positioning block and the positioning hole.

8. The multi-pole modular oil-immersed circuit breaker according to claim 5, characterized in that: One end of the position limiting tripping plate (1) is provided with a U-shaped bracket extending into the connecting groove (4), and the traction rod (2) is fixedly connected to the U-shaped bracket.

9. The multi-pole modular oil-immersed circuit breaker according to claim 1, characterized in that: The contact mechanism (7) comprises a movable bracket (71) rotatably arranged on a circuit breaker housing (81), a movable contact (72) arranged on the movable bracket (71), and an operating component for driving the movable bracket (71) to perform opening and closing movements; an opening spring (74) is arranged between the movable bracket (71) and the circuit breaker housing (81); a limiting slot (12) is provided on the side of the limiting trip plate (1) facing the movable bracket (71); and the upper end of the movable bracket (71) away from the movable contact (72) is connected to the limiting slot (12) to form a limiting fit.

10. The multi-pole modular oil-immersed circuit breaker according to claim 9, characterized in that: The operating assembly includes a handle slider (75) that moves in an arc trajectory on a circuit breaker housing (81), and a transmission connecting rod (77) and a transmission spring (78) connected between the movable bracket (71) and the handle slider (75). A guide groove (79) that is slidably connected to the transmission connecting rod and a slide groove that is slidably connected to the handle slider (75) are provided in the circuit breaker housing (81). At least one sliding rib (76) that is in contact with the side wall of the slide groove is provided on the arc bottom surface of the handle slider (75).

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