Moving contact piece, contact assembly and load switch for gas insulated switchgear

Abstract

The utility model discloses a moving contact piece, a contact assembly applied by the moving contact piece, and a load switch for a gas-insulated switchgear. The moving contact piece comprises at least two cutter bodies arranged in parallel, a connecting part is arranged in the middle of each cutter body, insulating assemblies are detachably arranged at the two ends of each cutter body, each insulating assembly is composed of a dish-shaped insulating piece, a threaded connecting piece and a fixing piece, and a hollow cavity is formed to enhance the insulating effect. Innovatively, the moving contact piece is further provided with a thermal shrinkage piece and a thermal expansion piece which are located on the outer side of the insulator and in the cavity respectively, and by means of the thermal expansion and cold contraction characteristics of materials, the length of the insulator is automatically adjusted when the moving contact is heated, the creepage distance is increased, and the insulation performance is improved. According to the contact assembly and the load switch provided by the utility model, the heat dissipation performance and the insulation performance of the moving contact piece are effectively improved by adopting the unique design of the insulation assembly, the thermal shrinkage piece and the thermal expansion piece. Meanwhile, the length of the insulator can be automatically adjusted when the moving contact is heated, the creepage distance is increased, and the operation safety of an electric appliance is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to load switch technical field, concretely relates to a movable contact piece, contact assembly and load switch for gassing cabinet. BACKGROUND

[0002] In the power system, the movable contact piece is the key component of the load switch, circuit breaker and other electrical appliances. The traditional movable contact piece design often has problems such as poor heat dissipation performance, unstable insulation performance, especially in high-voltage and high-current application scenarios, these problems are particularly prominent. In addition, in order to improve the insulation performance, the traditional movable contact piece is fixedly provided with an insulation block at both ends of the movable contact to increase the creepage distance, and the length of the insulation block in the prior art is fixed, which may cause the insulation performance to decrease in some special scenarios, thereby affecting the safe operation of the electrical appliance. Therefore, it is necessary to optimize the structure of the movable contact piece to improve its heat dissipation performance, insulation performance and operation stability. SUMMARY

[0003] (I) Technical problem to be solved

[0004] To solve the above problems, the utility model provides a movable contact piece, a contact assembly and a load switch for a gassing cabinet, aiming to solve the problem of unstable insulation performance in the prior art.

[0005] (II) Technical scheme

[0006] The utility model relates to a movable contact piece, which comprises:

[0007] At least two blade bodies, the two blade bodies are arranged in parallel to each other, and a connecting portion is arranged at the middle part of the blade body;

[0008] An insulation assembly is detachably arranged at both ends of the blade body, the insulation assembly comprises a plurality of insulation bodies, a threaded connecting piece for connecting the insulation bodies and a fixing piece, wherein the fixing piece is located between the two blade bodies, the insulation body is sleeved on the threaded connecting piece, and one end of the threaded connecting piece penetrates through the blade body and is connected with one end of the fixing piece;

[0009] A heat shrinkable piece is sleeved on the threaded connecting piece, and the heat shrinkable piece is located on the outer side of the insulation body and is used to stretch the length of the insulation body when the movable contact is heated to increase the creepage distance;

[0010] The insulation body is composed of two oppositely arranged disc-shaped insulation pieces, a hollow cavity is formed between the two insulation pieces, and the edges of the insulation pieces are arranged in abutment and adsorption.

[0011] In the utility model, the thermal expansion piece is further sleeved on the threaded connecting piece, is arranged in the cavity and is used for expanding the length of the insulator when the movable contact is heated.

[0012] In the utility model, the insulator is arranged on the outer side of the cutter body, and contacts are arranged on the inner side of both ends of the cutter body.

[0013] In the utility model, the material of the thermal shrinkage piece is aerogel, and the thermal shrinkage piece is a circular ring block structure.

[0014] In the utility model, the material of the thermal expansion piece is one or a combination of polypropylene plastic, quartz, tungsten and molybdenum.

[0015] The utility model discloses another kind of contact assembly, the contact assembly includes static contact, the movable contact piece of above-mentioned technical scheme and the shaft assembly for driving the action of movable contact piece, the movable contact piece is connected with the shaft assembly, and under the control of the shaft assembly, it can be contacted with the static contact and be closed, and the terminal is arranged at one end of the movable contact.

[0016] In the utility model, the shaft assembly includes driving shaft, at least one driving block and connecting block, the driving block is sleeved on the driving shaft, one end of the connecting block is connected with the driving block, and the other end is connected with the movable contact piece.

[0017] Another kind of load switch for gas-filled cabinet of the utility model, the load switch includes the contact assembly of above-mentioned technical scheme.

[0018] (Three) beneficial effects

[0019] Compared with prior art, the beneficial effects of the utility model are:

[0020] (1) the contact assembly and load switch in the utility model, through the design of unique insulating assembly and thermal shrinkage, thermal expansion piece, effectively improve the heat dissipation performance and insulating performance of movable contact piece. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or prior art, the drawings needed to be used in the embodiment or prior art description will be simply introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creating labor.

[0022] Figure 1 Schematic diagram of the three-dimensional structure of the load switch;

[0023] Figure 2 Schematic diagram of the three-dimensional structure of the contact assembly;

[0024] Figure 3 Schematic diagram of the three-dimensional structure of the moving contact member;

[0025] Figure 4 This is a schematic diagram of the exploded structure of the insulation component;

[0026] Figure 5 Schematic diagram of the explosion structure of the insulator.

[0027] 1. Blade body, 11. Connecting part, 12. Contact, 2. Insulating assembly, 21. Insulator, 211. Insulating part, 212. Cavity, 22. Threaded connector, 23. Fixing part, 3. Heat shrink part, 4. Heat expansion part, 5. Static contact, 6. Rotating shaft assembly, 61. Drive shaft, 62. Drive block, 63. Connecting block. DETAILED DESCRIPTION

[0028] Compared to the embodiments shown in the drawings, feasible embodiments within the scope of protection of the present disclosure may have fewer components, additional components not shown in the drawings, different components, differently arranged components, or differently connected components, etc. In addition, two or more components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0029] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by persons of ordinary skill in the art to which this invention belongs. The terms "first," "second," and similar expressions used in the specification and claims of this utility model patent application do not denote any order, quantity, or importance, but are merely used to distinguish different components. Similarly, terms such as "a" or "an" do not necessarily indicate a quantitative limitation. Terms such as "include," "comprising," or "having" mean that the element or object preceding the term encompasses the elements or objects listed after the term and their equivalents, but do not exclude other elements or objects. Terms such as "connected" or "connected" are not limited to physical or mechanical connections or communications as shown in the accompanying drawings, but may include equivalent connections or communications, whether direct or indirect. Terms such as "upper," "lower," "left," "right," "horizontal," and "vertical" are used only to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0030] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] Example 1

[0032] like Figures 1-5 As shown, the movable contact member of the present invention is mainly composed of at least two blade bodies 1, an insulating component 2, a heat shrinkable member 3 and a heat expandable member 4.

[0033] There are two blade bodies 1, which are arranged parallel to each other. A connecting portion 11 is provided in their middle to connect and support the entire moving contact. The material of the blade body 1 should have good conductivity and mechanical strength to ensure stable operation under high current and mechanical stress.

[0034] The insulation assembly 2 is removably mounted at each end of the blade body 1, providing electrical isolation between the blade body 1 and the external environment. The insulation assembly 2 comprises multiple insulators 21, a threaded connector 22, and a fixing member 23. The insulators 21 are composed of two opposing disc-shaped insulators 211, forming a hollow cavity 212 between them. Their edges abut against each other for absorption, enhancing insulation. One end of the threaded connector 22 passes through the blade body 1 and connects to one end of a fixing member 23. The fixing member 23 is located between the two blade bodies 1, securing and connecting the insulators 21.

[0035] The heat shrink element 3 is fitted over the threaded connector 22 and positioned outside the insulator 21. The heat shrink element 3 is made of aerogel, a material with excellent thermal stability and insulation properties. When the moving contact heats up, the heat shrink element 3 expands, stretching the insulator 21, thereby increasing the creepage distance and improving insulation performance. The heat shrink element 3 is a circular block structure, making it easy to install and remove.

[0036] Thermal expansion element 4 is also mounted on threaded connector 22 but located within cavity 212. Thermal expansion element 4 is made of one or a combination of polypropylene, quartz, tungsten, or molybdenum. These materials exhibit excellent thermal expansion and contraction properties. When the moving contact heats up, thermal expansion element 4 expands, extending the length of insulator 21, further increasing creepage distance and improving insulation performance.

[0037] In addition, the insulator 21 is arranged on the outer side of the blade body 1, and the inner sides of both ends of the blade body 1 are provided with contacts 12 for contacting with the static contact to close the circuit.

[0038] The contact assembly of the present invention comprises a static contact 5, the above-mentioned moving contact member and a rotating shaft assembly 6 for driving the moving contact member to move.

[0039] The static contact 5 is fixed to the fixed part of the switch cabinet and is used to contact with the moving contact to close the circuit breaker.

[0040] The shaft assembly 6 includes a drive shaft 61, at least one drive block 62, and a connecting block 63. The drive block 62 is mounted on the drive shaft 61. The connecting block 63 is connected to the drive block 62 at one end and to the connecting portion 11 of the movable contact at the other end. When the drive shaft 61 rotates, the drive block 62 and connecting block 63 drive the movable contact to open and close the circuit breaker.

[0041] The load switch for an inflatable cabinet of the present invention comprises the above-mentioned contact assembly and a load switch body. The contact assembly is mounted on the load switch body, and the opening and closing operations are realized through the transmission mechanism and control system inside the load switch body.

[0042] When the load switch needs to be closed, the control system activates the transmission mechanism, driving the drive shaft 61 of the shaft assembly 6. The rotation of the drive shaft 61, through the transmission of the drive block 62 and the connecting block 63, drives the blade 1 of the movable contact member toward the stationary contact 5 until the contact point 12 contacts the stationary contact 5, closing the circuit breaker. At this point, a conductive path is formed between the movable contact member and the stationary contact 5, allowing current to be transmitted through the load switch.

[0043] When the load switch needs to open, the control system similarly activates the transmission mechanism, but in the opposite direction. The reverse rotation of the drive shaft 61, through the transmission mechanism, drives the blade 1 of the movable contact away from the stationary contact 5 until the contact 12 separates from the stationary contact 5. At this point, the conductive path between the movable contact and the stationary contact 5 is severed, and current can no longer flow through the load switch.

[0044] During the operation of the load switch, the moving contact may heat up due to the thermal effect of the current. At this time, the heat shrink element 3 and the heat expand element 4 expand, stretching and extending the length of the insulator 21, increasing the creepage distance and improving the insulation performance. This not only prevents insulation failure caused by heating of the moving contact, but also improves the reliability and safety of the load switch.

[0045] This utility model provides a compact and reliable movable contact, contact assembly, and load switch for an inflatable cabinet. By employing heat-shrink and heat-expandable components, the insulation performance of the movable contact is effectively improved, preventing insulation failure caused by heat generation. Furthermore, the design of the contact assembly and load switch fully considers practicality and reliability, meeting the high demands placed on switchgear by power systems.

[0046] The above-described embodiments are merely preferred embodiments of the present application, and are not intended to limit the design concept and scope of the present application. Without departing from the design concept of the present application, various modifications and improvements to the technical solutions of the present application made by those of ordinary skill in the art shall fall within the protection scope of the present application, and the technical content of the present application claimed for protection has been entirely recorded in the claims.

Claims

1. A moving contact, characterized in that: The moving contact member comprises: At least two blades, the two blades are arranged parallel to each other, and a connecting portion is provided in the middle of the blades; an insulating assembly detachably disposed at both ends of the blade body, the insulating assembly comprising a plurality of insulators and a threaded connector and a fixing member for connecting the insulators, wherein the fixing member is located between the two blade bodies, the insulator is sleeved on the threaded connector, and one end of the threaded connector passes through the blade body and is connected to one end of the fixing member; a heat shrink member, sleeved on the threaded connector, the heat shrink member being located on the outer side of the insulator and being used to stretch the length of the insulator when the moving contact is heated, thereby increasing the creepage distance; The insulator is composed of two disc-shaped insulating parts arranged opposite to each other, a hollow cavity is formed between the two insulating parts, and the edges of the insulating parts are arranged to abut against each other and be adsorbed.

2. The moving contact member according to claim 1, characterized in that: The threaded connector is also sleeved with a thermal expansion member, which is arranged in the cavity and is used to expand the length of the insulator when the moving contact is heated.

3. The moving contact member according to claim 1 or 2, characterized in that: The insulator is arranged on the outer side of the blade body, and contacts are arranged on the inner sides of both ends of the blade body.

4. The moving contact member according to claim 3, characterized in that: The heat shrinkable component is made of aerogel and has a circular block structure.

5. The moving contact member according to claim 4, characterized in that: The thermal expansion member is made of one or more of polypropylene plastic, quartz, tungsten metal, and molybdenum metal.

6. A contact assembly, characterized in that: The contact assembly includes a static contact, a moving contact member according to any one of claims 1 to 5, and a rotating shaft assembly for driving the moving contact member to move. The moving contact member is connected to the rotating shaft assembly and can contact and close the static contact under the control of the rotating shaft assembly. A terminal is provided at one end of the moving contact.

7. The contact assembly according to claim 6, wherein: The rotating shaft assembly includes a driving shaft, at least one driving block and a connecting block. The driving block is sleeved on the driving shaft. One end of the connecting block is connected to the driving block, and the other end is connected to the moving contact member.

8. A load switch for an inflatable cabinet, characterized in that: The load switch includes the contact assembly according to any one of claims 6 to 7.

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