Plum blossom contact

Abstract

The utility model relates to the technical field of circuit breakers, and provides a tulip contact which comprises a supporting frame and a plurality of contact pieces, the supporting frame is annular, the contact pieces are assembled on the supporting frame to form an annular body, a contact arm and a static contact piece are arranged at the two ends of the interior of the annular body respectively, and a first annular groove and a second annular groove are formed in the outer walls of the two ends of the annular body respectively. A first spring is arranged in the first annular groove, a second spring is arranged in the second annular groove, and a pressing piece is arranged between the first spring and the second spring and used for pressing the first spring and the second spring. The pressing piece is arranged between the first spring and the second spring, the pressing piece can press the first spring and the second spring, tight contact is guaranteed, the risk of too high temperature caused by poor contact is avoided, the contact pressure of each contact is increased, the contact resistance is reduced under the condition that the normal connection state is guaranteed, and the service life of the contact is prolonged. The deformation speed of the first spring and the second spring is slowed down, and the service life of the tulip contact is prolonged.

Description

Technical Field

[0001] This application relates to the technical field of circuit breakers, and more particularly, to a plum blossom contact. Background Art

[0002] The plum blossom contact is used for primary conduction in high-voltage vacuum circuit breakers, medium-position cabinets, hand trucks, etc. The contact pressure between its moving and static contacts is an important indicator of the conductivity of the main circuit. It is an important influencing factor for whether the main circuit isolating contact can withstand the impact current during operation and whether the temperature rise is qualified under full load operation.

[0003] Currently, the plum blossom contacts on the market are mainly double-sided double springs. During the operation and maintenance of high-voltage circuit breakers over the years, it has been found that for some high-voltage circuit breakers with large on-off currents, after the plum blossom contacts have experienced frequent biting and disconnection, the contact areas are prone to oxidation, and the springs on the contacts are unevenly stressed, resulting in opening, deformation, and discoloration. Especially in equipment that has exceeded its service life or has been operating for more than 5 years, switches with a large loop current of more than 2500A, impact load switches, and circuit breakers that frequently perform in-and-out operations, some irreversible changes occur, resulting in a decrease in contact pressure and an increase in contact resistance. Subsequently, the heat generation of the circuit breaker increases, and in the long run, it evolves into a grounding accident or even a short-circuit accident, posing a huge hidden danger to the maintenance of electrical equipment and the stable operation of the power grid. Therefore, a plum blossom contact is proposed. Summary of the Utility Model

[0004] The purpose of the embodiments of this application is to provide a plum blossom contact, which can increase the contact pressure of each contact point, reduce the contact resistance, delay the deformation speed of the plum blossom contact spring, and enhance the mechanical strength of the plum blossom contact while ensuring a normal connection state.

[0005] The embodiments of this application provide a plum blossom contact, which adopts the following technical solutions:

[0006] A plum blossom contact includes a support frame and a plurality of contact pieces. The support frame is annular, and the plurality of contact pieces are assembled on the support frame to form an annular body. A contact arm and a static contact piece are respectively arranged at both ends inside the annular body. First annular grooves and second annular grooves are arranged on the outer walls at both ends of the annular body. A first spring is arranged in the first annular groove, a second spring is arranged in the second annular groove, and a pressing member is arranged between the first spring and the second spring. The pressing member is used to press the first spring and the second spring.

[0007] Preferably, the pressing member is a spring.

[0008] Preferably, the outer diameter of the pressing member is greater than the outer diameters of the first spring and the second spring.

[0009] Preferably, the first spring and the second spring have the same dimensions.

[0010] Preferably, the contact piece is made of T2 copper.

[0011] Preferably, the support frame is made of non-magnetic stainless steel.

[0012] Compared with the prior art, the beneficial effects of the present application are as follows:

[0013] In the present application, a pressing member is arranged between the first spring and the second spring. The pressing member can press the first spring and the second spring, ensuring firm contact, avoiding the risk of excessive temperature caused by poor contact, and increasing the contact pressure of each contact point while ensuring a normal connection state, reducing the contact resistance, delaying the deformation speed of the first spring and the second spring, extending the service life of the plum blossom contact, increasing the operation time of the equipment, reducing the number of repairs, and reducing the maintenance cost. Description of the Drawings

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present application and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts.

[0015] Figure 1 Structural schematic diagrams of some embodiments of the present utility model;

[0016] Figure 2 Cross-sectional views of some embodiments of the present utility model;

[0017] Figure 3 Side views of some embodiments of the present utility model.

[0018] The reference numerals are respectively:

[0019] 1, support frame; 2, contact piece; 3, annular body; 4, contact arm; 5, static contact piece; 6, first annular groove; 7, second annular groove; 8, first spring; 9, second spring; 10, pressing member. Detailed Embodiments

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Usually, the components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0021] Accordingly, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but merely represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the scope of protection of the present application.

[0022] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not require further definition and explanation in subsequent drawings.

[0023] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is usually placed during use. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0024] Furthermore, terms such as "horizontal", "vertical", "overhanging", etc. do not mean that the component is required to be absolutely horizontal or overhanging, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but may be slightly inclined.

[0025] In the description of the present application, it should also be noted that unless otherwise clearly defined and limited, the terms "arranged", "installed", "connected", "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0026] Embodiment

[0027] Such as Figures 1 - 3As shown in the figure, the plum blossom contact described in the embodiment of the present application includes a support frame 1 and a plurality of contact pieces 2. The support frame 1 is annular, and the plurality of contact pieces 2 are assembled on the support frame 1 to form an annular body 3. A contact arm 4 and a static contact piece 5 are respectively arranged at both inner ends of the annular body 3. First annular grooves 6 and second annular grooves 7 are arranged on the outer walls at both ends of the annular body 3. A first spring 8 is arranged in the first annular groove 6, and a second spring 9 is arranged in the second annular groove 7. A pressing member 10 is arranged between the first spring 8 and the second spring 9. The pressing member 10 is used to press the first spring 8 and the second spring 9 to ensure tight contact, avoid the risk of excessive temperature caused by poor contact, and increase the contact pressure of each contact point under the condition of ensuring a normal connection state, reduce the contact resistance, slow down the deformation speed of the first spring 8 and the second spring 9, extend the service life of the plum blossom contact, improve the operation time of the equipment, reduce the number of repairs, and reduce the maintenance cost.

[0028] In this embodiment, the pressing member 10 is a spring, which is convenient for disassembling and assembling the pressing member 10, and the pressing member 10 can strengthen the longitudinal pressure of the first spring 8 and the second spring 9, maintain the balance of the pressure on both sides, and the first springs 8 and the second springs 9 on both sides are tightly stressed. If the first spring 8 and the second spring 9 become loose or cracked during operation, the pressing member 10 can assist in time to ensure that the biting pressure is met.

[0029] In this embodiment, the outer diameter of the pressing member 10 is larger than the outer diameters of the first spring 8 and the second spring 9. The pressing member 10 has a higher elastic force, and the increased circular size does not affect the outer diameter of the plum blossom contact entering the contact box.

[0030] In this embodiment, the first spring 8 and the second spring 9 have the same size.

[0031] In this embodiment, the contact piece is made of T2 copper. T2 copper has good electrical conductivity, thermal conductivity, corrosion resistance and processing performance.

[0032] In this embodiment, the support frame 1 is made of non-magnetic stainless steel, which can prevent rust and avoid eddy currents at the same time.

[0033] The above is only the preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A plum blossom contact, characterized in that: It includes a support frame and several contact pieces. The support frame is annular. Several of the contact pieces are assembled on the support frame to form an annular body. A contact arm and a static contact piece are respectively arranged at both inner ends of the annular body. First annular grooves and second annular grooves are arranged on the outer walls at both ends of the annular body. A first spring is arranged in the first annular groove, and a second spring is arranged in the second annular groove. A pressing member is arranged between the first spring and the second spring, and the pressing member is used to press the first spring and the second spring.

2. The plum blossom contact according to claim 1, characterized in that: The pressing member is a spring.

3. The plum blossom contact according to claim 2, characterized in that: The outer diameter of the pressing member is larger than the outer diameters of the first spring and the second spring.

4. The plum blossom contact according to claim 3, characterized in that: The first spring and the second spring have the same size.

5. A plum blossom contact according to claim 1, characterized in that: The contact piece is made of T2 copper.

6. The plum blossom contact according to claim 1, characterized in that: The support frame is made of non-magnetic stainless steel.

Images