Conductive system of oil-immersed circuit breaker

Abstract

The utility model discloses a conductive system of an oil-immersed circuit breaker, which comprises a moving contact, a static contact, an inlet wire connecting plate and an outlet wire connecting plate which are arranged in a shell, and two soft connecting wires which penetrate into the shell and are respectively connected with the inlet wire connecting plate and the outlet wire connecting plate, the flexible connecting line is provided with a threading hole, a limiting blocking piece for pressing the flexible connecting line is arranged in the threading hole, and a retaining blocking piece in limiting fit with the limiting blocking piece is arranged on the section, arranged in the shell, of the flexible connecting line, and the technical scheme is adopted, the flexible connecting line can drive the retaining blocking piece to abut against the limiting blocking piece when being pulled by external force in the installation and use process, and therefore the flexible connecting line can be prevented from being damaged, and the service life of the flexible connecting line is prolonged. The flexible connecting wire is prevented from being dragged outwards through the limiting cooperation between the retaining stopper and the limiting stopper, the tensile strength of the flexible connecting wire is improved, the influence of a conductive system on the performance of a product body under the action of external force is reduced, the installation stability is good, and the electrical performance, characteristics and service life of the product are ensured.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, specifically to a conductive system for an oil-immersed circuit breaker. Background Technology

[0002] An oil-immersed circuit breaker is a power switching device that uses highly insulating oil as the dielectric. In power systems, oil-immersed circuit breakers are mainly used for the protection and control of power transmission and distribution networks. They can interrupt and isolate fault currents in circuits, protecting electrical equipment and personal safety. When the circuit is operating normally, the circuit breaker can achieve functions such as power outage, power supply, and circuit switching by closing or opening the circuit supplying electrical energy.

[0003] The existing oil-immersed circuit breaker's conductive system includes an incoming conductor, a bimetallic strip, a moving contact, a stationary contact, and an outgoing conductor connected in sequence. The circuit breaker housing has wiring holes for the incoming and outgoing conductors to pass through. The incoming conductor is welded to the connecting plate of the bimetallic strip, and the outgoing conductor is welded to the stationary contact. During installation, the incoming and outgoing conductors are easily subjected to external pulling forces, which can cause them to loosen. This can even cause the bimetallic strip and stationary contact to become loose or deformed, resulting in poor installation stability and affecting the product's performance. Utility Model Content

[0004] Therefore, the technical problem to be solved by this utility model is to overcome the problem that the incoming and outgoing wires in the prior art are easily pulled by external forces, causing them to loosen, and even causing the bimetallic strip and stationary contact to loosen and deform, resulting in poor installation stability and affecting the performance of the product.

[0005] To solve the above-mentioned technical problems, this utility model provides a conductive system for an oil-immersed circuit breaker, including a moving contact, a stationary contact, an inlet connection plate, and an outlet connection plate disposed within a housing, and two flexible connecting wires passing through the housing and respectively connected to the inlet connection plate and the outlet connection plate. The housing includes two through holes for the two flexible connecting wires to pass through, and a limiting stop is provided in the through hole to press the flexible connecting wires. A backstop is provided on the section of the flexible connecting wire that passes through the housing, forming a limiting engagement with the limiting stop. The limiting stop is provided with a clamping groove for pressing the flexible connecting wires and blocking the backstop from passing through.

[0006] As a preferred embodiment, the limiting stop is a limiting insert that can be detachably inserted into the thread hole.

[0007] As a preferred embodiment, slots that cooperate with limiting inserts are provided on the two side walls of the threading hole, and the limiting inserts are inserted into the slots to block the position of the threading hole.

[0008] As a preferred embodiment, the housing includes a housing base and a housing cover, the wire hole is formed between the housing base and the housing, the slot is disposed in the housing base, and the housing cover presses against the top of the limiting insert when installed in the housing base.

[0009] As a preferred embodiment, the clamping groove is formed at the bottom end of the limiting insert, the bottom end of the limiting insert contacts the bottom of the threading hole, and the width of the anti-reverse stop is greater than the width of the clamping groove.

[0010] As a preferred embodiment, the anti-reverse stop is a block structure formed by riveting one section of the flexible connecting wire.

[0011] As a preferred embodiment, a temperature sensing element is provided inside the housing, the inlet connection plate is fixed to one end of the temperature sensing element and connected to the moving contact via a flexible wire, the stationary contact is disposed on the bend of the outlet connection plate, and the moving contact is oscillating relative to the stationary contact in the housing via an operating component.

[0012] As a preferred embodiment, the moving contact, the incoming connection plate, and one of its flexible connecting wires are welded or riveted together to form an integral moving conductor assembly, and the stationary contact, the outgoing connection plate, and another flexible connecting wire are welded or riveted together to form an integral stationary conductor assembly.

[0013] As a preferred embodiment, the housing is provided with a first boss and a second boss that are staggered vertically, and a guide groove formed between the first boss and the second boss. The cable outlet connecting plate is movably disposed in the guide groove, and a contact spring is provided between the cable outlet connecting plate and the first boss.

[0014] As a preferred embodiment, the first boss has an L-shaped structure, and the lead-out connecting plate has a first bent end that abuts against the first boss and a second bent end with a stationary contact. The lead-out connecting plate is connected to the first boss to form a spring groove surrounding the contact spring, and the two ends of the contact spring abut against the first boss and the second bent end, respectively.

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

[0016] 1. In the oil-immersed circuit breaker conductive system provided by this utility model, two flexible connecting wires pass through two through holes to connect to the inlet and outlet connecting plates respectively. A limiting stop is provided in the through hole to press the flexible connecting wire, and a backstop is provided on the section of the flexible connecting wire that enters the housing. The limiting stop can both clamp the flexible connecting wire and restrict the backstop to the inside of the through hole. The advantage of this design is that when the flexible connecting wire is pulled by external force during installation and use, it will cause the backstop to abut against the limiting stop. The limiting cooperation between the backstop and the limiting stop prevents the flexible connecting wire from being dragged outward, improving the tensile strength of the flexible connecting wire, ensuring good installation stability, and preventing the flexible connecting wire from loosening or deforming from the inlet or outlet connecting plate under tension. This ensures the stability and reliability of the connection between the flexible connecting wire and the connecting plate, and improves the electrical performance and service life of the circuit breaker conductive system.

[0017] 2. In the conductive system of the oil-immersed circuit breaker provided by this utility model, the limiting stop is preferably a limiting insert inserted into the wire hole. Correspondingly, slots that cooperate with the limiting insert are provided on the two side walls of the wire hole. With this structure, during installation, the limiting insert is slidably inserted into the wire hole through the slot and the flexible connecting wire is pressed. Then, when the cover is installed on the housing, it presses against the top of the limiting insert, which can prevent the limiting insert from coming out of the slot. This achieves the goal of keeping the limiting insert in a fixed relative installation position in the wire hole. This limiting insert installation structure is simple and convenient. The cooperation between the limiting insert and the stop block can prevent the flexible connecting wire from being pulled outward by external force.

[0018] 3. In the oil-immersed circuit breaker conductive system provided by this utility model, the outgoing line connecting plate is installed in the guide groove formed between the first boss and the second boss. The guide groove guides the outgoing line connecting plate during installation, and a spring groove surrounding the contact spring is formed between the outgoing line connecting plate and the first boss. The spring groove limits the installation of the contact spring, facilitating its installation and positioning. Through the elastic connection between the contact spring and the outgoing line connecting plate, the outgoing line connecting plate can be elastically moved within the housing. With this structure, when the moving and stationary contacts are pressed together, the outgoing line connecting plate is displaced by compressing the contact spring under the pressure of the moving contact, so that the contact spring is compressed and stores energy, providing continuous and stable contact pressure for the moving and stationary contacts. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a three-dimensional structural diagram of the conductive system of the oil-immersed circuit breaker of this utility model.

[0021] Figure 2 This is a schematic diagram of the planar structure of the conductive system of the oil-immersed circuit breaker of this utility model.

[0022] Figure 3 This is a schematic diagram of the connection structure between the flexible connecting cable and the incoming line connecting plate of this utility model;

[0023] Figure 4 This is a schematic diagram of the connection structure between the flexible connecting wire and the outgoing connecting plate of this utility model.

[0024] Explanation of reference numerals in the attached drawings: 1. Housing; 11. Wire hole; 12. Slot; 13. First boss; 14. Second boss; 15. Spring groove; 101. Housing base; 102. Housing cover; 2. Inlet connecting plate; 3. Outlet connecting plate; 31. First bent end; 32. Second bent end; 4. Flexible connecting wire; 5. Limiting stop; 51. Clamping groove; 6. Anti-reverse stop; 7. Moving contact; 8. Stationary contact; 9. Temperature sensing element; 10. Contact spring. Detailed Implementation

[0025] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0026] In the description of this utility model, it should be noted that the terms "first", "second" and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] Example

[0029] This embodiment provides, as follows: Figure 1-4 The illustrated conductive system of an oil-immersed circuit breaker includes a moving contact 7, a stationary contact 8, an inlet connecting plate 2, and an outlet connecting plate 3 disposed within a housing 1, and two flexible connecting wires 4 passing through the housing 1 and connected to the inlet connecting plate 2 and the outlet connecting plate 3 respectively. The inlet connecting plate 2 is electrically connected to the moving contact, and the outlet connecting plate 3 is electrically connected to the stationary contact. The housing 1 includes two through holes 11 through which the two flexible connecting wires 4 can pass. A limiting stop 5 is provided in the through hole 11 to press the flexible connecting wire 4. A backstop 6 is provided on the section of the flexible connecting wire 4 that passes through the housing 1, forming a limiting cooperation with the limiting stop 5. The limiting stop 5 is provided with a clamping groove 51 for pressing the flexible connecting wire 4 and blocking the backstop 6 from passing through.

[0030] The above-described implementation method is the core technical solution of this embodiment. The two flexible connecting wires 4 pass through two through-holes 11 to connect to the inlet connecting plate 2 and the outlet connecting plate 3 respectively. A limiting stop 5 is provided inside the through-hole 11 to press the flexible connecting wire 4, and a backstop 6 is provided on the section of the flexible connecting wire 4 that enters the housing. The limiting stop 5 can both clamp the flexible connecting wire 4 and restrict the backstop 6 inside the through-hole 11. The advantage of this design is that when the flexible connecting wire 4 is pulled by external force during installation and use, it will cause the backstop 6 to abut against the limiting stop 5. The limiting cooperation between the backstop 6 and the limiting stop 5 prevents the flexible connecting wire 4 from being dragged outward, improving the tensile strength of the flexible connecting wire 4, ensuring good installation stability, and preventing the flexible connecting wire 4 from loosening or deforming from the inlet connecting plate 2 or the outlet connecting plate under tension. This ensures the stability and reliability of the connection between the flexible connecting wire and the connecting plate, and improves the electrical performance and service life of the circuit breaker's conductive system.

[0031] The following combination Figure 1-4 The specific configuration of the anti-reverse stop and the limit stop is described in detail below:

[0032] The limiting stop 5 is a detachable limiting insert that can be inserted into the wire hole 11. The two side walls of the wire hole 11 are provided with slots 12 that cooperate with the limiting insert. The limiting insert is inserted into the slot 12 to block the position of the wire hole 11. This prevents the stop from coming out of the wire hole 11 after being blocked by the position of the limiting insert. It can effectively resist the external pulling force on the flexible connecting wire 4, thereby avoiding the situation where the connection position between the flexible connecting wire 4 and the wire connecting plate becomes loose due to the force pulling outward. It has good installation protection and ensures the stable electrical performance of the connection between the flexible connecting wire 4 and the inlet connecting plate 2 and the outlet connecting plate 3.

[0033] In a further preferred configuration, the housing 1 includes a housing base 101 and a housing cover 102. The wire-passing hole 11 is formed between the housing base 101 and the housing 1. The slot 12 is disposed in the housing base 101. When the housing cover 102 is installed in the housing base 101, it presses against the top of the limiting insert. With this structure, during installation, the limiting insert is slidably inserted into the wire-passing hole 11 through the slot 12 and presses against the flexible connector 4. Then, when the housing cover 102 is installed in the housing base 101, it presses against the top of the limiting insert. This prevents the limiting insert from coming out of the slot 12, thus maintaining the limiting insert in a fixed relative position within the wire-passing hole. This limiting insert installation structure is simple and convenient. The cooperation between the limiting insert and the stop block prevents the flexible connector from being pulled outward by external force.

[0034] like Figure 3 As shown, the clamping groove 51 is formed at the bottom end of the limiting insert, and the bottom end of the limiting insert contacts the bottom surface of the wire hole 11, thus sealing the opening of the clamping groove 51 to clamp and press the flexible connecting wire 4. Preferably, this flexible connecting wire 4 is a copper braided flexible wire made of multiple strands of copper wire. The anti-reverse stop 6 is a block structure formed by riveting one section of the flexible connecting wire 4, specifically in the shape of a square block. That is, the flexible connecting wire 4 is manufactured using a riveting process to form the block structure anti-reverse stop 6, which is convenient to manufacture and install. The width of the anti-reverse stop 6 is greater than the width of the clamping groove 51, thus preventing the anti-reverse stop 6 from passing through the clamping groove 51 and limiting it from being blocked inside the limiting stop 5. This allows the anti-reverse stop 6 and the limiting stop 5 to form a limiting fit that restricts the outward pulling of the flexible connecting wire 4.

[0035] In this embodiment, a temperature sensing element 9 is provided inside the housing 1. The inlet connection plate 2 is fixedly connected to one end of the temperature sensing element 9. The temperature sensing element 9 is preferably a bimetallic strip. The stationary contact 8 is disposed on the outlet connection plate 3. The moving contact 7 is oscillating relative to the stationary contact 8 and disposed in the housing 1 via an operating component. The inlet connection plate 2 is electrically connected to the moving contact 7 via a flexible wire. The inlet connection plate is welded or riveted to one of its flexible connecting wires. The outlet connection plate is welded or riveted to another flexible connecting wire. With this structure, the moving contact, the inlet connection plate, and one of its flexible connecting wires are integrated into a moving conductor assembly through welding or riveting. The stationary contact, the outlet connection plate, and another flexible connecting wire are integrated into a stationary conductor assembly through welding or riveting. The main circuit of the circuit breaker is connected by the contact between the moving conductor assembly and the stationary conductor assembly, thereby forming a main circuit within the oil-immersed circuit breaker that passes through the inlet connection plate 2, the moving contact 7, the stationary contact 8, and the outlet connection plate 3.

[0036] Combination Figure 4As shown, the housing 1 is provided with a first boss 13 and a second boss 14 that are staggered vertically, and a guide groove formed between the first boss 13 and the second boss 14. The outgoing connection plate 3 is movably disposed in the guide groove, and a contact spring 10 is disposed between the outgoing connection plate 3 and the first boss 13. Since the stationary contact 8 is disposed on the outgoing connection plate 3, the contact spring 10 provides contact pressure to keep the moving and stationary contacts in close contact. In a further preferred configuration, the first boss 13 has an L-shaped structure, and the lead-out connecting plate 3 has a first bent end that abuts against the first boss 13 and a second bent end 32 with a stationary contact 8. The lead-out connecting plate 3 is connected to the first boss 13 to form a spring groove 15 surrounding the contact spring 10. The two ends of the contact spring 10 abut against the first boss 13 and the second bent end 32, respectively. The spring groove 15 provides a limiting installation function for the contact spring 10, facilitating its installation and positioning. The elastic connection between the contact spring 10 and the lead-out connecting plate 3 allows the lead-out connecting plate 3, together with the stationary contact 8, to be elastically movable within the housing 1. The guide groove provides an installation guide function for the lead-out connecting plate 3, preventing it from shifting position. In this structural configuration, when the moving and stationary contacts are pressed together, the outgoing connecting plate 3 is displaced by compressing the contact spring 10 under the pressure of the moving contact 7. This compresses the contact spring to store energy and provide continuous and stable contact pressure to the moving and stationary contacts. The advantages of this design are as follows: First, it ensures that the moving and stationary contacts can maintain a certain contact pressure after electrical wear, thus maintaining good contact. Second, it can utilize the elastic force of the contact spring to buffer when the contacts are closed and reduce contact bounce. Third, when the moving and stationary contacts separate, the contact spring can enable the moving contact to obtain a certain initial kinetic energy, increasing the initial breaking speed, reducing the arcing time, and thus increasing the contact breaking speed.

[0037] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A conductive system for an oil-immersed circuit breaker, comprising an inlet connection plate (2) and an outlet connection plate (3) disposed within a housing (1), and two flexible connecting wires (4) passing through the housing and respectively connected to the inlet connection plate (2) and the outlet connection plate (3), wherein the housing (1) includes two through holes (11) through which the two flexible connecting wires (4) can pass, characterized in that: The wire hole (11) is provided with a limiting stop (5) to press the flexible connecting wire (4). The section of the flexible connecting wire (4) that passes through the housing is provided with a backstop (6) that forms a limiting fit with the limiting stop (5). The limiting stop (5) is provided with a clamping groove (51) for pressing the flexible connecting wire (4) and blocking the backstop (6) from passing through.

2. The conductive system of an oil-immersed circuit breaker according to claim 1, characterized in that: The limiting stop (5) is a limiting insert that can be detachably inserted into the thread hole (11).

3. The conductive system of an oil-immersed circuit breaker according to claim 2, characterized in that: The two side walls of the thread hole (11) are provided with slots (12) that cooperate with the limiting insert. The limiting insert is inserted into the slot (12) to block the position of the thread hole (11).

4. The conductive system of an oil-immersed circuit breaker according to claim 3, characterized in that: The housing (1) includes a housing base (101) and a housing cover (102). The wire hole (11) is formed between the housing base (101) and the housing (1). The slot (12) is disposed in the housing base (101). When the housing cover (102) is installed in the housing base (101), it presses against the top of the limiting insert.

5. The conductive system of an oil-immersed circuit breaker according to claim 4, characterized in that: The clamping groove (51) is formed at the bottom end of the limiting insert, and the bottom end of the limiting insert contacts the bottom surface of the thread hole (11).

6. The conductive system of an oil-immersed circuit breaker according to claim 1, characterized in that: The backstop (6) is a block structure formed by riveting one section of the flexible connecting wire (4).

7. The conductive system of an oil-immersed circuit breaker according to claim 1, characterized in that: It also includes a moving contact (7), a stationary contact (8) and a temperature sensing element (9) disposed in the housing (1). The inlet connection plate (2) is fixed to one end of the temperature sensing element (9) and connected to the moving contact through a flexible wire. The stationary contact (8) is disposed on the outlet connection plate (3). The moving contact (7) is swayable relative to the stationary contact (8) in the housing (1) through an operating component.

8. The conductive system of an oil-immersed circuit breaker according to claim 7, characterized in that: The moving contact, the incoming connection plate, and one of its flexible connecting wires are welded or riveted together to form an integral moving conductor assembly, and the stationary contact, the outgoing connection plate, and another flexible connecting wire are welded or riveted together to form an integral stationary conductor assembly.

9. The conductive system of an oil-immersed circuit breaker according to claim 1, characterized in that: The housing (1) is provided with a first boss (13) and a second boss (14) that are staggered vertically, and a guide groove formed between the first boss (13) and the second boss (14). The cable connection plate (3) is movably disposed in the guide groove. A contact spring (10) is provided between the cable connection plate (3) and the first boss (13).

10. The conductive system of an oil-immersed circuit breaker according to claim 9, characterized in that: The first boss (13) has an L-shaped structure. The lead-out connecting plate (3) has a first bent end that abuts against the first boss (13) and a second bent end (32) with a stationary contact (8). The lead-out connecting plate (3) is connected to the first boss (13) to form a spring groove (15) surrounding the contact spring (10). The two ends of the contact spring (10) abut against the first boss (13) and the second bent end (32) respectively.

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