CN211719494U - Contact structure of isolating switch - Google Patents

Abstract

A contact structure of an isolating switch comprises a shell (1), wherein a contact support (2), a plurality of groups of fixed contacts (3) and a movable contact assembly (4) which correspond to each other are arranged in the shell (1), and the isolating switch is characterized in that the movable contact assembly (4) comprises a long movable contact (401) and a short movable contact (402), the long movable contact (401) and the short movable contact (402) are spliced together through a boss structure in a lap joint mode, and an elastic element (5) presses the long movable contact (401) and the short movable contact (402) to enable the long movable contact (401) and the short movable contact (402) to be arranged on the contact support (2) in a limiting mode. According to the contact structure, the long contact and the short contact are spliced, so that after an electric arc is cut off, other positions except the arc contact cannot be affected by the ablation of the electric arc, and the movable contact and the fixed contact are ensured to be reliably contacted; meanwhile, the moving contact component forms a parallel circuit, so that the internal resistance is reduced, the heat productivity of the switch after being electrified is reduced, the heat dissipation area is increased, and the switching performance is improved.

Description

Contact structure of isolating switch

Technical Field

The utility model belongs to the electrical switch field, concretely relates to isolator's contact structure.

Background

The isolating switch mainly plays a role in safety isolation and safety in a power distribution system, and also plays a role in on-load brake separation in a few cases. When the switch is switched off with load, electric arcs can be generated between the contacts, and the current switch in the market usually adopts means such as an arc extinguish chamber and the like to rapidly extinguish the electric arcs when the condition of switching off with load is considered. However, no matter how fast the arc is extinguished, the arc-generating contacts are subject to greater ablation and damage. However, the silver alloy contact is often not provided in the conventional common disconnecting switch, so that the ablation resistance of the conventional common disconnecting switch is insufficient, and at the moment, an arc contact area specially used for ablation is generally designed on the contact, so that the contact can maintain better performance after being ablated. But this solution increases the production costs.

Meanwhile, because the electrical switch is electrified to generate heat during normal work due to self internal resistance, the electrical switch and cables and cabinets connected with the electrical switch have large heat effect, so that the service life of parts is shortened, and serious accidents such as fire disasters can be caused in serious cases. In addition, the index of the current carried by the disconnecting switch in a short circuit is also an important index for considering the quality of the switch, the heat generated by the internal resistance of the electric switch can cause the melting of metal conductors such as cables, and the like, and the contact resistance of the movable contact and the fixed contact is generally reduced by increasing the effective contact area and the contact pressure of the contact so as to achieve the aim of reducing the heating, but the increase range of the effective contact area and the contact pressure of the contact is limited, so that the melting of the metal conductors such as the cables, and the like, caused by the heat generated by the internal resistance of.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the technical defect that the existing isolating switch contact has, the utility model provides a contact structure of an isolating switch, which uses the difference of length and length dimensions to make the end part of a long moving contact become an arc contact by splicing a long moving contact and a short moving contact, after the arc is cut off, the other positions outside the arc contact can not be affected by arc ablation, thus ensuring the reliable contact of the moving contact and a static contact, improving the electrical performance of the switch, and not increasing additional parts, and being convenient to install; meanwhile, the long moving contact and the short moving contact are spliced, so that the moving contact component produced by the method forms a parallel circuit, the internal resistance is reduced, the heat productivity of the switch after being electrified is reduced, the heat dissipation area is increased, and the switching performance is improved.

Technical scheme

In order to realize the technical purpose, the utility model provides a pair of isolator's contact structure, it includes the casing, be provided with the static contact and the moving contact subassembly that contact carrier, a plurality of groups correspond each other in the casing, moving contact subassembly is in on the contact carrier, contact carrier can make a round trip to slide in the casing, moving contact subassembly along with contact carrier is in make a round trip to slide in-process in the casing can with corresponding static contact and separation, its characterized in that: the moving contact component comprises a long moving contact and a short moving contact, the long moving contact and the short moving contact are spliced together through a boss structure, and an elastic element presses the long moving contact and the short moving contact to enable the long moving contact and the short moving contact to be limited and arranged on the contact support.

Furthermore, the upper surface of the elastic element props against the hole wall of the moving contact mounting hole on the contact support, and two ends of the elastic element press two ends of the long moving contact and the short moving contact to enable the long moving contact and the short moving contact to be limited and mounted in the moving contact mounting hole on the contact support.

Furthermore, the contact support is provided with 2 moving contact mounting holes which are vertically and symmetrically arranged, moving contact components are arranged in the 2 moving contact mounting holes, and the 2 moving contact components are contacted and separated with the static contact inserted between the 2 moving contact components in the process of sliding back and forth in the shell along with the contact support.

Further, the contact support is mounted in a groove in the middle of the housing and can slide in the groove.

Further, the elastic element is a spring piece.

Furthermore, contact bosses are arranged at the contact parts of the long moving contact and the short moving contact with the corresponding fixed contacts.

Furthermore, the boss structure comprises a long boss arranged on one side of the long moving contact and a short boss arranged on one side of the short moving contact, the long boss and the short boss are spliced in a lap joint mode, and two ends of the long boss extend out of two ends of the short boss.

Further, the fixed contact is fixedly mounted on the housing.

Advantageous effects

The utility model provides a contact structure of isolator, through the concatenation of two moving contacts of length, utilize length size difference, make the tip of long moving contact become the arc contact, divide the power failure arc after, other positions outside the arc contact can not be influenced by the arc ablation, guaranteed moving contact and static contact reliable contact, thereby improved the electrical property of switch, and do not increase extra part, it is more convenient to install; meanwhile, the long moving contact and the short moving contact are spliced, so that the moving contact component produced by the method forms a parallel circuit, the internal resistance is reduced, the heat productivity of the switch after being electrified is reduced, the heat dissipation area is increased, and the switching performance is improved.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

fig. 2 is a schematic structural diagram of the moving contact assembly in the embodiment of the present invention;

FIG. 3 is a schematic diagram of the position relationship between the moving contact assembly and the elastic element in the embodiment of the present invention;

fig. 4 is a schematic view of a position of a moving contact mounting hole in the embodiment of the present invention;

FIG. 5 is a schematic structural view of a contact boss in an embodiment of the present invention;

fig. 6 is a schematic view of a mounting structure of a moving contact component in the embodiment of the present invention;

fig. 7 is a schematic structural diagram of a contact holder according to an embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

As shown in fig. 1, a contact structure of an isolating switch includes a housing 1, a contact support 2, a plurality of groups of corresponding static contacts 3 and moving contacts 4 are disposed in the housing 1, the moving contacts 4 are mounted on the contact support 2, the contact support 2 can slide back and forth in the housing 1, and the static contacts 3 are fixedly mounted on the housing 1.

In this embodiment, the contact holder 2 is mounted in a groove 101 in the middle of the housing 1 and can slide in the groove 101. In the present embodiment, as shown in fig. 4 and 7, the contact support 2 is provided with 2 moving contact mounting holes 201 which are vertically and symmetrically arranged in the vertical direction, the moving contact assembly 4 is installed in the 2 moving contact mounting holes 201, and the 2 moving contact assemblies 4 are in contact with and separated from the fixed contacts 3 inserted therebetween in the process of the contact support 2 sliding back and forth in the housing 1.

In this embodiment, as shown in fig. 2, the boss structure includes a long boss 401b disposed on one side of the long moving contact 401 and a short boss 402b disposed on one side of the short moving contact, the long boss 401b and the short boss 402b are overlapped and assembled, and two ends of the long boss 401b extend out of two ends of the short boss 402 b. The elastic element 5 presses the long moving contact 401 and the short moving contact 402 to make them limit-mounted on the contact support 2. In this embodiment, the elastic element 5 is a spring plate. As shown in fig. 3, 6 and 7, the upper surface of the elastic element 5 abuts against the hole wall of the moving contact mounting hole 201 on the contact support 2, and two ends of the elastic element 5 press two ends of the long moving contact 401 and the short moving contact 402 to be limited and mounted in the moving contact mounting hole 201 on the contact support 2. As shown in fig. 5, contact bosses 401a,402a are provided at the portions of the long movable contact 401 and the short movable contact 402, which are in contact with the corresponding stationary contacts 3.

The long moving contact of the moving contact component is firstly contacted with the fixed contact in the switching-on process and then separated from the fixed contact in the switching-off process. The end part of the long moving contact is an arc contact through the splicing of the long moving contact and the short moving contact, and after the arc is cut off, other positions except the arc contact cannot be affected by the arc ablation, so that the reliable contact between the moving contact and the static contact is ensured, the electrical performance of the switch is improved, no additional part is added, and the installation is more convenient; meanwhile, the long moving contact and the short moving contact are spliced, so that the moving contact component produced by the method forms a parallel circuit, the internal resistance is reduced, the heat productivity of the switch after being electrified is reduced, the heat dissipation area is increased, and the switching performance is improved.

The structure, proportion, size, quantity, etc. shown in the attached drawings of the embodiment of the present invention are only used for matching with the contents disclosed in the specification, so as to be known and read by people familiar with the art, not for limiting the limit conditions that the present invention can be implemented, so that the present invention has no technical essential meaning, and the modification of any structure, the change of proportion relation or the adjustment of size should still fall within the range that the technical contents can be covered without affecting the function that the present invention can produce and the purpose that can be achieved. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle", "clockwise", "counterclockwise", etc. used in the present specification are for the sake of clarity only, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof are considered to be the scope of the present invention without substantial changes in the technical content.

Claims (8)

1. A contact structure of an isolating switch comprises a shell (1), wherein a contact support (2), a plurality of groups of fixed contacts (3) and movable contact assemblies (4) which correspond to each other are arranged in the shell (1), the movable contact assemblies (4) are arranged on the contact support (2), the contact support (2) can slide back and forth in the shell (1), and the movable contact assemblies (4) can be contacted with and separated from the corresponding fixed contacts (3) along with the contact support (2) in the back and forth sliding process in the shell (1), and the isolating switch is characterized in that: the moving contact component (4) comprises a long moving contact (401) and a short moving contact (402), the long moving contact (401) and the short moving contact (402) are spliced together through a boss structure, and an elastic element (5) presses the long moving contact (401) and the short moving contact (402) to enable the long moving contact (401) and the short moving contact (402) to be arranged on the contact support (2) in a limiting mode.

2. A contact structure of a disconnecting switch according to claim 1, characterized in that: the upper surface of the elastic element (5) props against the hole wall of the moving contact mounting hole (201) on the contact support (2), and two ends of the elastic element (5) press two ends of the long moving contact (401) and the short moving contact (402) to enable the two ends to be limited and mounted in the moving contact mounting hole (201) on the contact support (2).

3. A contact structure of a disconnecting switch according to claim 1, characterized in that: the contact support (2) is provided with 2 moving contact mounting holes (201) which are vertically and symmetrically arranged in the vertical direction, moving contact assemblies (4) are arranged in the 2 moving contact mounting holes (201), and the 2 moving contact assemblies (4) are contacted and separated with static contacts (3) inserted between the moving contact assemblies in the process of sliding back and forth in the shell (1) along with the contact support (2).

4. A contact structure of a disconnecting switch according to claim 1, characterized in that: the contact support (2) is arranged in a groove (101) in the middle of the shell (1) and can slide in the groove (101).

5. A contact structure of a disconnecting switch according to claim 1 or 2, characterized in that: the elastic element (5) is a spring piece.

6. A contact structure of a disconnecting switch according to claim 1, characterized in that: contact bosses (401a,402a) are arranged at the contact parts of the long moving contact (401) and the short moving contact (402) and the corresponding fixed contact (3).

7. A contact structure of a disconnecting switch according to claim 1, characterized in that: the boss structure comprises a long boss (401b) arranged on one side of the long moving contact (401) and a short boss (402b) arranged on one side of the short moving contact, the long boss (401b) and the short boss (402b) are connected in an overlapping and assembling mode, and two ends of the long boss (401b) extend out of two ends of the short boss (402 b).

8. A contact structure of a disconnecting switch according to claim 1, characterized in that: the static contact (3) is fixedly arranged on the shell (1).

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