Universal circuit breaker contact structure

Abstract

The utility model discloses a universal circuit breaker contact structure, which comprises a moving contact assembly arranged on a contact support and a mounting groove used for connecting a mechanism connecting rod, the contact support is provided with a positioning hole communicated with the mounting groove in a penetrating manner, and a positioning shaft penetrating through the mounting groove is arranged in the positioning hole. The contact support is provided with a positioning hole, the two ends of the positioning shaft are symmetrically arranged in the positioning hole, the two ends of the positioning hole are internally provided with two insulation supporting pieces which are arranged at the two ends of the positioning shaft in a surrounding and sleeving mode, and the two side walls of the two sides of the contact support are provided with two clamping plates which block the two ends of the positioning hole, so that installation and connection between the contact support and the mechanism connecting rod are achieved through the installation design. The length of the positioning shaft is longer, so that the connection strength can be improved, and the structure of the contact support is basically symmetrical, so that the rotation stress of the contact support is more balanced, the consistency and reliability of the contact support for driving the contact assembly to move are ensured, the installation stability is good, and the use performance of the contact structure is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a universal circuit breaker contact structure. Background Art

[0002] A universal circuit breaker is a mechanical switch that can connect, carry and disconnect current under normal circuit conditions, and can also connect, carry for a certain period of time and disconnect current under specified abnormal conditions, to protect the distribution line from overload and short circuit faults. Among them, the contact structure is an important component of the universal circuit breaker, and whether its working performance is reliable is very critical to the performance of the switch. The contact structure of the universal circuit breaker is relatively complex, and often includes a contact support and a moving contact arranged on the contact support. The contact support is connected to the connecting rod through a built-in positioning shaft, and then the connecting rod is connected to the crank arm of the operating mechanism, so that the operating mechanism can drive the connecting rod to move through the crank arm, so that the contact support flips to achieve closing and opening operations. For example, Chinese patent document CN208954921U discloses a universal circuit breaker contact support mechanism, including a contact support body and a connecting rod. A positioning hole is provided on one side of the contact support body, and a mounting groove connected to the positioning hole is provided on the contact support body. A first connecting hole exposed outside the contact support body is provided at one end of the connecting rod, and the other end of the connecting rod passes through the mounting groove and is provided with a second connecting hole extending into the positioning hole. A positioning shaft inserted into the second connecting hole is provided in the positioning hole, and a limiting portion is provided on the positioning shaft to form a limiting match with the positioning hole. A spring seat is clamped in the opening of the positioning hole, and a compression spring is provided between the positioning shaft and the spring seat.

[0003] From the structure of the above-mentioned contact support mechanism and the accompanying drawings in the literature, it can be seen that the positioning shaft in the contact support mechanism is basically on one side of the contact support. For the frame circuit breaker, its moving contacts have many pieces and are arranged side by side (the side-by-side direction is the same as the axial direction of the positioning shaft). However, since the positioning shaft is on one side of the contact support, it will cause unbalanced force on various parts of the contact support, which can easily cause certain deviations in the movement of the moving contacts at different positions on the contact support, poor consistency and reliability, and affect the performance of the contact support. Utility Model Content

[0004] Therefore, the technical problem to be solved by the utility model is to overcome the problem in the prior art that the positioning shaft is located on one side of the contact support, which leads to unbalanced force on various parts of the contact support, easily causing the contact support to drive multiple moving contacts to move with certain deviations, poor consistency and reliability.

[0005] In order to solve the above problems, the utility model provides a universal circuit breaker contact structure, including a contact support, a moving contact assembly arranged on the contact support and a mounting groove for a connecting mechanism connecting rod, the contact support is provided with a positioning hole passing through the groove walls on both sides of the mounting groove, the two ends of the positioning hole extend to the side walls on both sides of the contact support, a positioning shaft passing through the mounting groove is arranged in the positioning hole, the positioning shaft is symmetrically arranged in the positioning hole about the width center line of the mounting groove, two insulating support members surrounding and sleeved on the two ends of the positioning shaft are accommodated in the two ends of the positioning hole, two clamping plates blocking the two ends of the positioning hole are installed on the side walls on both sides of the contact support, so that the two insulating support members are limitedly installed between the two ends of the positioning shaft and the two clamping plates.

[0006] As a preferred solution, the two insulating support members have two groove holes arranged opposite to each other, and the two ends of the positioning shaft are connected to the two groove holes.

[0007] As a preferred embodiment, the positioning hole includes a first hole portion that passes through and connects to the installation groove, and two second hole portions connected to both ends of the first hole portion, and the aperture of the second hole portion is larger than the aperture of the first hole portion; the cross-section of the two insulating supports is a circular structure and they are respectively matched and installed in the two second hole portions.

[0008] As a preferred embodiment, the positioning shaft is a symmetrically arranged stepped shaft structure, which includes a first shaft portion matched and connected to the first hole portion, and two second shaft portions extending from both ends of the first shaft portion to the two second hole portions, the diameter of the second shaft portion is smaller than the diameter of the second shaft portion, and the two second shaft portions are connected to two insulating supports.

[0009] As a preferred solution, the insulating support member is a sleeve made of plastic material.

[0010] As a preferred solution, the two clamps are fixedly connected to the contact support by a riveting structure or a screw structure, and the side walls of the contact support are provided with accommodating grooves suitable for accommodating the two clamps. One end of the two clamps extends and is rotatably connected to the mounting bracket on the conductive bar.

[0011] As a preferred embodiment, the contact support includes a plurality of contact slots arranged at intervals, the moving contact assembly includes a plurality of moving contacts arranged in the plurality of contact slots, and a contact spring arranged between the moving contacts and the contact slots, and a rotating shaft member that passes through the plurality of moving contacts is arranged between the two clamping plates.

[0012] As a preferred solution, an arc isolation baffle extending along the arrangement direction of the multiple moving contacts is provided on the contact support, and the arc isolation baffle is located at the lower side of the contact points of the multiple moving contacts.

[0013] Compared with the prior art, the technical solution of the utility model has the following advantages:

[0014] 1. In the contact structure of the universal circuit breaker provided by the utility model, a positioning hole connected to the installation groove is provided on the contact support, and a symmetrically arranged positioning shaft is inserted in the positioning hole. During installation, the mechanism connecting rod is first placed in the corresponding installation groove, and then the positioning shaft is inserted into the positioning hole and connected to the mechanism connecting rod. Then, two insulating support members sleeved on the two ends of the positioning shaft are placed in the two ends of the positioning hole. Finally, two clamping plates are fixed on both sides of the contact support. The two clamping plates cover the two ends of the positioning hole and play a role in limiting the installation of the two insulating support members. The insulating support members play a role in limiting and supporting the two ends of the positioning shaft, thereby preventing the positioning shaft from coming out of the two ends of the positioning hole. In this way, the installation connection between the contact support and the mechanism connecting rod is realized. Since the positioning shaft is symmetrically arranged in the positioning hole, the length of the positioning shaft can be made longer to increase the connection strength. In addition, the structure of the contact support is basically symmetrical, which is conducive to more balanced force on the rotation of the contact support, ensuring the consistency and reliability of the movement of the contact assembly driven by the contact support, avoiding the occurrence of movement deviation, and having good installation stability, thereby improving the performance of the contact structure.

[0015] 2. In the universal circuit breaker contact structure provided by the utility model, the two insulating support members are shaft sleeves made of plastic material and have two grooves arranged opposite to each other, so that the two ends of the positioning shaft can be inserted into the grooves of the two insulating support members. Such an installation design ensures the tightness of the connection between the two ends of the positioning shaft, and realizes the coaxial rotation effect of the two ends of the positioning shaft, the installation force is more balanced, and the positioning shaft is insulated and separated from the two clamping plates by two insulating support members, so as to avoid electrical contact between the positioning shaft and the two clamping plates, thereby ensuring the safety of use.

[0016] 3. In the universal circuit breaker contact structure provided by the utility model, the positioning shaft adopts a stepped shaft structure design with a large middle part and small sides, which includes a first shaft portion with a larger diameter and two first shaft portions with smaller diameters on both sides. The positioning shaft is connected with the first hole portion of the positioning hole through the first shaft portion to ensure sufficient connection strength, and the second shaft portion is designed to be smaller than the second hole portion of the positioning hole, so as to leave space for placing the insulating support. The wall thickness of the groove of the insulating support used to surround the positioning shaft can be made thicker, which is beneficial to improve its own structural strength and is not easy to be damaged. In this way, the installation design is reasonable, and the positioning shaft is limitedly installed in the positioning hole through the cooperation of the insulating support and the clamping plate, and the symmetrical installation design of the positioning shaft in the positioning hole is used to balance the installation force, which can ensure that the contact support drives the movement of multiple moving contacts with better synchronization.

[0017] 4. In the contact structure of the universal circuit breaker provided by the utility model, an arc-isolating baffle located on the lower side of the contact points of multiple moving contacts is arranged on the contact support. With this structural arrangement, when the moving and static contacts are disconnected to generate arcing, the arc-isolating baffle can block the arc from spreading along the moving contact piece to the side of the conductive bar, thereby increasing the creepage distance and isolating the arc, which is beneficial to reducing the burning time of the arc between the moving and static contacts, avoiding arcing and reducing contact burning. 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 creative work.

[0019] Figure 1 It is a three-dimensional structural schematic diagram of the contact structure of the universal circuit breaker of the utility model;

[0020] Figure 2 It is a schematic diagram of the planar structure of the contact structure of the universal circuit breaker of the utility model;

[0021] Figure 3 for Figure 2 Schematic diagram of the cross-section structure along line AA;

[0022] Figure 4 This is a schematic diagram of the structure of the universal circuit breaker contact structure after the clamping plate is hidden;

[0023] Explanation of the reference numerals: 1. contact support; 11. accommodating groove; 2. moving contact assembly; 3. mounting groove; 4. positioning hole; 5. positioning shaft; 51. first shaft portion; 52. second shaft portion; 6. insulating support member; 61. groove hole; 7. clamping plate; 71. rotating shaft member; 8. arc-isolating baffle; 9. conductive bar. DETAILED DESCRIPTION

[0024] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] In the description of the present invention, it should be noted that the terms "first", "second" and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0028] Example

[0029] The present embodiment is described in detail below with reference to the accompanying drawings:

[0030] This embodiment provides Figure 1-4 A universal circuit breaker contact structure shown in the figure comprises a contact support 1, a moving contact assembly 2 arranged on the contact support 1 and a mounting groove 3 for a connecting mechanism connecting rod, characterized in that the contact support 1 is provided with a positioning hole 4 which passes through the groove walls on both sides of the mounting groove 3, and the two ends of the positioning hole 4 extend to the side walls on both sides of the contact support 1, and a positioning shaft 5 which passes through the mounting groove 3 is arranged in the positioning hole 4, and the positioning shaft 5 is symmetrically arranged in the positioning hole 4 about the width center line of the mounting groove 3, and two insulating support members 6 which surround and sleeve the two ends of the positioning shaft 5 are accommodated in the two ends of the positioning hole 4, and two clamping plates 7 which block the two ends of the positioning hole 4 are installed on the side walls on both sides of the contact support 1, so that the two insulating support members 6 are limitedly installed between the two ends of the positioning shaft 5 and the two clamping plates 7.

[0031] The above implementation mode is the core technical scheme of this embodiment. During installation, the mechanism connecting rod is first placed in the corresponding installation groove 3, and then the positioning shaft 5 is inserted into the positioning hole 4 and connected to the mechanism connecting rod. Then, two insulating support members 6 are placed at both ends of the positioning hole and are sleeved on both ends of the positioning shaft 5. Finally, two clamping plates 7 are fixed on both sides of the contact bracket. The two clamping plates 7 are used to cover the two ends of the positioning hole and limit the installation of the two insulating support members 6. The insulating support members 6 also limit and support the two ends of the positioning shaft 5, thereby preventing the positioning shaft 5 from escaping from the two ends of the positioning hole 4. In this way, the installation connection between the contact support 1 and the mechanism connecting rod is realized. According to the positioning shaft 5 being symmetrically arranged in the positioning hole 4, the length of the positioning shaft 5 can be made longer to increase the connection strength. In addition, the structure of the contact support 1 is basically symmetrical, which is conducive to a more balanced force on the rotation of the contact support, ensuring the consistency and reliability of the movement of multiple moving contacts driven by the contact support, avoiding the occurrence of movement deviation, and having good installation stability, thereby improving the performance of the contact structure.

[0032] It is further preferred that the two insulating supports 6 have two groove holes 61 arranged opposite to each other, and the two ends of the positioning shaft 5 are connected to the two groove holes 61. The insulating support 6 is a sleeve made of plastic material; or, the insulating support 6 can also adopt a sleeve or an isolation sleeve made of rubber material. With this structural setting, the two ends of the positioning shaft 5 can be inserted into the grooves of the two insulating supports 6. Such installation ensures the tightness of the connection between the two ends of the positioning shaft 5, and realizes the coaxial rotation effect of the two ends of the positioning shaft 5. The installation force is more balanced, and the positioning shaft 5 is insulated and separated from the two clamping plates 7 by the two insulating supports 6 to avoid electrical contact between the positioning shaft 5 and the two clamping plates 7, thereby ensuring safety of use.

[0033] Combine the following Figure 2-4 The specific setting method of the positioning axis and the positioning hole is described in detail:

[0034] The positioning hole 4 includes a first hole portion that passes through and connects to the mounting groove 3, and two second hole portions connected to the two ends of the first hole portion, wherein the aperture of the second hole portion is larger than that of the first hole portion; the cross-section of the two insulating supports 6 is a circular structure and is matched and installed in the two second hole portions respectively. Correspondingly, the positioning shaft 5 is a symmetrically arranged stepped shaft structure, which includes a first shaft portion 51 matched and connected to the first hole portion, and two second shaft portions 52 extending from the two ends of the first shaft portion 51 to the two second hole portions, wherein the diameter of the second shaft portion 52 is smaller than the diameter of the second shaft portion 52, and the two second shaft portions 52 are connected to the grooves of the two insulating supports 6. The advantage of such a design is that, according to the stepped shaft structure design of the positioning shaft 5 with a large middle portion and small sides, it includes a first shaft portion 51 with a larger diameter and two first shaft portions 51 with smaller diameters on both sides, and the positioning shaft 5 is just in contact with the positioning shaft 5 through the first shaft portion 51. The first hole portion of the hole 4 is matched and connected to ensure sufficient connection strength, and the second shaft portion 52 is designed to be smaller than the second hole portion of the positioning hole 4, so that space is reserved for placing the insulating support 6. The wall thickness of the groove of the insulating support 6 used to surround the positioning shaft 5 can be made thicker, which is beneficial to improve its own structural strength and is not easy to be damaged. Such a reasonable installation design can realize the limited installation of the positioning shaft 5 in the positioning hole 4 through the cooperation of the insulating support and the clamping plate 7, and utilize the symmetrical installation design of the positioning shaft in the positioning hole to balance the installation force, which can ensure that the contact support drives the movement of multiple moving contacts with better synchronization.

[0035] In this embodiment, the two clamping plates 7 are fixedly connected to the contact support 1 by a riveting structure, or the two clamping plates 7 are fixedly connected to the contact support 1 by a screw structure. The side walls of the contact support 1 are provided with accommodating grooves 11 suitable for accommodating the two clamping plates 7. One end of the two clamping plates 7 is extended and rotatably connected to the mounting bracket on the conductive bar 9. In this way, the two clamping plates 7 installed on both sides of the contact support 1 are smoother and have better overall aesthetics. The two ends of the positioning holes 4 extending to both sides of the contact support 1 are blocked by the two clamping plates 7, thereby playing a limiting installation role for the two insulating support members 6 placed at the two ends of the positioning holes.

[0036] Combination Figure 1 and Figure 4As shown, the contact support 1 includes a plurality of contact slots arranged at intervals, the moving contact assembly 2 includes a plurality of moving contacts arranged in the plurality of contact slots, and a contact spring arranged between the moving contacts and the contact slots, and a rotating shaft 71 for connecting the plurality of moving contacts is arranged between the two clamping plates 7, the moving contact can rotate a certain angle relative to the contact support 1 through the rotating shaft 71, and the contact pressure of the moving contact can be increased through the contact spring, so as to ensure the tightness and stability of the moving and static contacts. Among them, the contact support 1 is provided with an arc-isolating baffle 8 extending along the arrangement direction of the plurality of moving contacts, and the arc-isolating baffle 8 is located at the lower side of the contact points of the plurality of moving contacts. With this structural arrangement, when the moving and static contacts are disconnected and an arc is generated, the arc-isolating baffle 8 can prevent the arc from spreading along the moving contact to the side of the conductive bar 9, thereby increasing the creepage distance and isolating the arc, which is beneficial to reducing the burning time of the arc between the moving and static contacts, avoiding arcing and reducing contact burnout.

[0037] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A universal circuit breaker contact structure, comprising a contact support (1), a moving contact assembly (2) arranged on the contact support (1), and a mounting groove (3) for a connecting mechanism connecting rod, characterized in that: The contact support (1) is provided with a positioning hole (4) penetrating through the groove walls on both sides of the mounting groove (3), and the two ends of the positioning hole (4) extend to the side walls on both sides of the contact support (1). The positioning hole (4) is provided with a positioning shaft (5) passing through the mounting groove (3), and the positioning shaft (5) is symmetrically arranged in the positioning hole (4) about the width center line of the mounting groove (3). Two insulating support members (6) surrounding and sleeved on the two ends of the positioning shaft are accommodated in the two ends of the positioning hole (4), and two clamping plates (7) are installed on the side walls on both sides of the contact support (1) to block the two ends of the positioning hole (4), so that the two insulating support members (6) are limitedly installed between the two ends of the positioning shaft and the two clamping plates (7).

2. The universal circuit breaker contact structure according to claim 1, characterized in that: The two insulating support members (6) have two groove holes (61) arranged opposite to each other, and the two ends of the positioning shaft (5) are connected to the two groove holes (61).

3. The universal circuit breaker contact structure according to claim 1, characterized in that: The positioning hole (4) comprises a first hole portion penetrating and communicating with the mounting groove (3), and two second hole portions connected to both ends of the first hole portion, wherein the aperture of the second hole portion is larger than the aperture of the first hole portion; the two insulating support members (6) have a circular cross-section and are respectively matched and mounted in the two second hole portions.

4. The universal circuit breaker contact structure according to claim 3, characterized in that: The positioning shaft (5) is a symmetrically arranged stepped shaft structure, comprising a first shaft portion (51) matched and connected to the first hole portion, and two second shaft portions (52) extending from both ends of the first shaft portion (51) to the two second hole portions, wherein the diameter of the second shaft portion (52) is smaller than the diameter of the second shaft portion (52), and the two second shaft portions (52) are connected to two insulating support members (6).

5. The universal circuit breaker contact structure according to claim 2, characterized in that: The insulating support member (6) is a shaft sleeve made of plastic material.

6. The universal circuit breaker contact structure according to any one of claims 1 to 5, characterized in that: The two clamping plates (7) are fixedly connected to the contact support (1) by a riveting structure or a screw structure. The side walls of the contact support (1) are provided with receiving grooves (11) suitable for matching and accommodating the two clamping plates (7). One end of the two clamping plates (7) is extended and rotatably connected to a mounting bracket on the conductive bar (9).

7. The universal circuit breaker contact structure according to claim 6, characterized in that: The contact support (1) comprises a plurality of contact slots arranged at intervals, the moving contact assembly (2) comprises a plurality of moving contacts arranged in the plurality of contact slots, and a contact spring arranged between the moving contacts and the contact slots, and a rotating shaft (71) passing through the plurality of moving contacts is arranged between two clamping plates (7).

8. The universal circuit breaker contact structure according to claim 7, characterized in that: The contact support (1) is provided with an arc isolation baffle (8) extending along the arrangement direction of the plurality of moving contacts, and the arc isolation baffle (8) is located at the lower side of the contact points of the plurality of moving contacts.

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