Change-over switch

Abstract

The utility model relates to the technical field of change-over switches, and provides a change-over switch, which comprises a rotating shaft, a static contact piece, a first waveform elastic piece, a first movable contact piece linked with the rotating shaft, and a first elastic piece cover used for extruding the first movable contact piece towards the static contact piece, the first movable contact piece is positioned at the upper part or the lower part of the static contact piece and is separated from or elastically propped against the static contact piece through rotation; and the first waveform elastic sheet is located between the first elastic sheet cover and the first movable contact sheet.

Description

Technical Field

[0001] The utility model relates to the technical field of change - over switches, and specifically, to a change - over switch. Background Art

[0002] The traditional structure of the change - over switch has problems such as unstable operation, easy damage, and poor arc - extinguishing effect. For example, during long - term use, the moving contact piece and the static contact piece will wear due to continuous closing and opening between them, resulting in problems such as poor contact between the moving contact piece and the static contact piece, and unable to meet the requirements of modern electrical equipment for high performance and high reliability. Content of the Utility Model

[0003] The utility model provides a change - over switch, which can reduce the risk of poor contact between the moving contact piece and the static contact piece and improve the reliability of the cooperation between the moving contact piece and the static contact piece.

[0004] The technical solution of the utility model is as follows:

[0005] A change - over switch includes a rotating shaft and a static contact piece, and includes a first corrugated spring piece, a first moving contact piece linked with the rotating shaft, and a first spring cover for pressing the first moving contact piece towards the static contact piece. The first moving contact piece is located above or below the static contact piece and is separated from or elastically abutted against the static contact piece by rotation.

[0006] The first corrugated spring piece is located between the first spring cover and the first moving contact piece.

[0007] Further, the first moving contact piece includes a first contact piece seat and a first moving contact head, and the first moving contact head is located on the side of the first contact piece seat.

[0008] Further, the first corrugated spring piece includes a plurality of lower spring pieces with a cross - section in the shape of "︺" and a plurality of upper spring pieces with a cross - section in the shape of "︹". Each lower spring piece and each upper spring piece are arranged alternately and are connected end to end to form a wavy structure.

[0009] And each of the lower spring pieces and each of the upper spring pieces surround to form an annular structure.

[0010] Further, the axial projection planes of the lower spring pieces and the upper spring pieces are both in the shape of an isosceles trapezoid, and the corners of the lower spring pieces and the corners of the upper spring pieces are all rounded.

[0011] Further, it includes a second moving contact piece with the same structure as the first moving contact piece, a second corrugated spring piece with the same structure as the first corrugated spring piece, and a second spring cover. The second moving contact piece is linked with the rotating shaft.

[0012] The second moving contact piece is located on the side of the static contact piece facing away from the first moving contact piece. The second corrugated spring piece is located on the side of the second moving contact piece facing away from the static contact piece. The second spring cover presses the second corrugated spring piece towards the second moving contact piece.

[0013] The second moving contact piece includes a second moving contact head. The first moving contact head and the second moving contact head are respectively located on the upper and lower surfaces of the static contact piece.

[0014] Furthermore, both the first corrugated spring piece and the second corrugated spring piece are made of high manganese steel.

[0015] Furthermore, guide surfaces are provided at the edges of both the upper and lower surfaces of the static contact piece.

[0016] Round corners are provided on both sides of the contact surfaces between the first moving contact piece and the static contact piece, and on both sides of the contact surfaces between the second moving contact piece and the static contact piece.

[0017] Furthermore, it includes a turntable clamped to the rotating shaft. The first moving contact piece and the second moving contact piece are respectively embedded at both ends of the turntable. An annular groove for the static contact piece to pass through is provided on the side surface of the turntable.

[0018] The first spring cover and the second spring cover are respectively located at both ends of the turntable and are fixedly connected to the turntable.

[0019] Furthermore, an arc extinguishing chamber is provided on one side of the static contact piece, and several arc extinguishing pieces are provided inside the arc extinguishing chamber.

[0020] An arc ignition piece is provided on one side of the arc extinguishing chamber.

[0021] Furthermore, a heat dissipation channel communicating with the outside is provided on one side of the static contact piece.

[0022] The working principle and beneficial effects of the present utility model are as follows:

[0023] 1. By adding corrugated spring pieces and optimizing the structural design of the corrugated spring pieces, the moving contact piece and the static contact piece can always be closely attached and the force is evenly distributed, avoiding problems such as poor contact between the moving contact piece and the static contact piece.

[0024] 2. By designing components such as a transmission shaft, an arc extinguishing chamber, and arc extinguishing pieces, the operation stability and reliability of the switch are improved. At the same time, the arc extinguishing effect is enhanced, effectively extending the service life of the switch. By introducing new components such as spring washers and static contact pieces, the structure of the switch is further optimized, making it more suitable for various electrical equipment and circuits. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The following further describes the present utility model in detail with reference to the drawings and specific embodiments.

[0026] Figure 1 is a three-dimensional view of the present utility model;

[0027] Figure 2 Internal schematic diagram of the present utility model;

[0028] Figure 3 Internal perspective view of the present utility model;

[0029] Figure 4 Schematic structural diagram of the first corrugated elastic sheet or the second corrugated elastic sheet in the present utility model;

[0030] Figure 5 Schematic structural diagram of the first moving contact piece or the second moving contact piece in the present utility model;

[0031] Figure 6 Schematic structural diagram of the static contact piece in the present utility model;

[0032] Figure 7 Schematic diagram of the cooperation between the static contact piece and the first moving contact piece and the second moving contact piece in the present utility model;

[0033] Figure 8 Schematic structural diagram of the turntable in the present utility model;

[0034] Figure 9 Partial cross-sectional view of the present utility model.

[0035] In the figure: 1, rotating shaft; 2, static contact piece; 31, first corrugated elastic sheet; 311, upper elastic sheet part; 312, lower elastic sheet part; 32, second corrugated elastic sheet; 41, first moving contact piece; 411, first moving contact head; 412, first contact piece seat; 42, second moving contact piece; 421, second moving contact head; 5, turntable; 51, first elastic sheet cover; 52, second elastic sheet cover; 53, annular groove; 61, arc extinguishing chamber; 62, arc extinguishing piece; 63, arc ignition piece; 7, heat dissipation channel. Specific embodiments

[0036] Next, in combination with the embodiments of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present utility model.

[0037] Embodiment 1

[0038] As Figures 1-9As shown in the figure, a change-over switch includes, but is not limited to, terminals, a knob, a rotating shaft 1, and a static contact 2. The knob is linked to the rotating shaft 1 to switch the on / off state of the switch or change the gear. To improve reliability, in this embodiment, a first corrugated spring piece 31, a first moving contact piece 41 linked to the rotating shaft 1, and a first spring cover 51 for pressing the first moving contact piece 41 towards the static contact 2 are provided in the switch housing. The first moving contact piece 41 is kept in close contact with the static contact 2 through the first corrugated spring piece 31 to avoid poor contact. The first moving contact piece 41 is located above or below the static contact 2 and is separated from or elastically abutted against the static contact 2 by rotation. The first corrugated spring piece 31 is arranged between the first spring cover 51 and the first moving contact piece 41 to facilitate pressing the first corrugated spring piece 31 by the first spring cover 51.

[0039] Among them, the first moving contact piece 41 in this embodiment is divided into a first contact seat 412 and a first moving contact head 411. The first contact seat 412 serves as a connecting part to stabilize the first moving contact head 411. The first moving contact head 411 is located on the side of the first contact seat 412, and the static contact 2 is also located on the side of the first moving contact piece 41. When the first moving contact head 411 rotates to the position of the static contact 2, it abuts against the static contact 2 to achieve conduction.

[0040] The first corrugated spring piece 31 in this embodiment includes a plurality of lower spring pieces 312 with a cross-section in the shape of "︺" and a plurality of upper spring pieces 311 with a cross-section in the shape of "︹". Each lower spring piece 312 and each upper spring piece 311 are integrally formed to ensure their own structural strength, and they are in an opposing structure without distinguishing between the upper and lower positions, which is convenient for assembly. And each lower spring piece 312 and each upper spring piece 311 are arranged in an alternating manner and are connected end to end to form a wavy structure. That is, the side of the lower spring piece 312 is connected to the side of the upper spring piece 311 to form an inclined surface. When an axial force is applied, it stores energy through the expansion of the side where the lower spring piece 312 is connected to the upper spring piece 311, thereby generating a reaction force for elastic deformation recovery to press tightly against the first moving contact piece 41. Therefore, when the first moving contact piece 41 and the static contact 2 are separated in this embodiment, there should be an intersection between the side of the first moving contact piece 41 and the side of the static contact 2. When the first moving contact piece 41 contacts the static contact 2, the first moving contact piece 41 presses itself against the static contact 2 by bending and using the generated elastic deformation recovery force, which realizes the above-mentioned elastic abutment. Then, combined with the first corrugated spring piece 31, a force pressing the first moving contact piece 41 towards the static contact 2 direction is provided for the whole first moving contact piece 41. Therefore, the tightness between the first moving contact head 411 and the static contact 2 can be further improved. Even if the contact surfaces of the first moving contact head 411 and the static contact wear during a long period of time, the gaps can be eliminated by the elastic forces from multiple parties.

[0041] In this embodiment, each lower elastic piece portion 312 and each upper elastic piece portion 311 are surrounded to form an annular structure. On the one hand, it is convenient to install or pass through structural members such as the rotating shaft 1 at the center of the first corrugated elastic piece 31. At the same time, the space for expansion and contraction provided for elastic deformation enables the overall first corrugated elastic piece 31 to be stressed and apply force evenly under the pressure of the first elastic piece cover 51, ensuring the stability of the first moving contact piece 41 and maintaining a consistent elastic force at all angles.

[0042] Moreover, the axial projection planes of both the lower elastic piece portion 312 and the upper elastic piece portion 311 are in an isosceles trapezoid structure, and the corners of the lower elastic piece portion 312 and the corners of the upper elastic piece portion 311 are all rounded. Such a design enables both ends of the first corrugated elastic piece 31 in the axial direction to have stable abutting planes, making the structure more stable after assembly. The design of each corner can also reduce the possibility of stress concentration, enabling the first corrugated elastic piece 31 to distribute force more evenly when subjected to external forces, thereby reducing the risks of fracture and deformation.

[0043] Embodiment Two

[0044] As Figures 1-8 shown, on the basis of Embodiment One, in order to further enhance the connection reliability between the static contact piece 2 and the moving contact piece, this embodiment adds a second moving contact piece 42 with the same structure as the first moving contact piece 41, a second corrugated elastic piece 32 with the same structure as the first corrugated elastic piece 31, and a second elastic piece cover 52. The second moving contact piece 42 is also linked with the rotating shaft 1 and, together with the first moving contact piece 41, cooperates with the static contact piece 2 simultaneously.

[0045] The specific setting method is to arrange the second moving contact piece 42 on the side of the static contact piece 2 opposite to the first moving contact piece 41, with the second corrugated elastic piece 32 located on the side of the second moving contact piece 42 opposite to the static contact piece 2, and the second elastic piece cover 52 squeezing the second corrugated elastic piece 32 towards the second moving contact piece 42. Generally speaking, the first elastic piece cover 51, the first corrugated elastic piece 31, and the first moving contact piece 41 are taken as a group, and the second elastic piece cover 52, the second corrugated elastic piece 32, and the second moving contact piece 42 are taken as a group. The two groups of structures are symmetrically arranged around the static contact piece 2 on the two contact surfaces of the static contact piece 2. That is, the second moving contact piece 42 includes a second moving contact head 421, and the first moving contact head 411 and the second moving contact head 421 are respectively located on the upper and lower surfaces of the static contact piece 2.

[0046] By clamping the static contact piece 2 with the first moving contact piece 41 and the second moving contact piece 42, it can not only ensure the pressure balance on the static contact piece 2 but also improve the stability of the contact between the static contact piece 2 and the first moving contact piece 41 and the second moving contact piece 42 when the static contact piece 2 forms a circuit.

[0047] In addition, in this embodiment, it is preferred that both the first corrugated elastic piece 31 and the second corrugated elastic piece 32 are made of high manganese steel, which has the advantages of high strength, high hardness, wear resistance, corrosion resistance, good low-temperature strength, easy processing, etc., further improving the reliability of this embodiment.

[0048] Moreover, since the first moving contact 411 and the second moving contact 421 both need to bend themselves to cross the side surface of the static contact piece 2 and contact the two contact surfaces of the static contact piece 2 respectively during the rotation process, in order to reduce resistance and facilitate operation, a guiding surface is provided at the edge position of the side surface of the static contact piece 2 in this embodiment. At the same time, rounded corners or guiding inclined surfaces are also provided on both sides of the contact surfaces between the first moving contact piece 41 and the static contact piece 2 and on both sides of the contact surfaces between the second moving contact piece 42 and the static contact piece 2 to reduce wear during cooperation and improve the service life.

[0049] In addition, in order to stabilize the first moving contact piece 41, the second moving contact piece 42, the first elastic piece cover 51 and the second elastic piece cover 52, a turntable 5 clamped with the rotating shaft 1 is also provided in this embodiment. Installation grooves are provided on the surface of the turntable 5 and positioning columns are provided at the center. The positioning columns are used to insert the first moving contact piece 41, the second moving contact piece 42, the first elastic piece cover 51, the second elastic piece cover 52, the first corrugated elastic piece 31 and the second corrugated elastic piece 32.

[0050] The first moving contact piece 41 and the second moving contact piece 42 are respectively embedded at both ends of the turntable 5. The rotating shaft 1 is driven to rotate by the knob, and the rotating shaft 1 then drives the turntable 5 to rotate, so as to realize the synchronous rotation of the first moving contact piece 41 and the second moving contact piece 42. An annular groove 53 for the static contact piece 2 to pass through is provided on the side surface of the turntable 5 to prevent the side surface of the turntable 5 from colliding with the static contact piece 2 when the static contact piece 2 is separated from the first moving contact piece 41 and the second moving contact piece 42. The first elastic piece cover 51 and the second elastic piece cover 52 can be respectively located at both ends of the turntable 5 and fixedly connected to the turntable 5 to realize the pressing and fixing of the first corrugated elastic piece 31 and the second corrugated elastic piece 32.

[0051] In addition, the first elastic piece cover 51 and the second elastic piece cover 52 can also be fixed or limited by other structures in the switch housing through fasteners such as screws. Or the first elastic piece cover 51 is fixed by using the fixing between its own upper rotating shaft 1 and the switch housing. It is also possible to use the top of the turntable 5 of the adjacent terminal or the top of the first elastic piece cover 51 on the adjacent terminal as the second elastic piece cover 52 to press and limit the second corrugated elastic piece 32. In this embodiment, preferably, the bottom surface of the installation groove is used as the second elastic piece cover 52, which saves costs, is convenient for assembly, reduces one reinforcement piece, and reduces the hidden danger at this place.

[0052] The design scheme of this embodiment and the first embodiment, compared with the way of installing the moving contact of the traditional bridge-type contact, the contact structure of the contact piece is simple, easy to manufacture, relatively low in cost, intuitive in operation, easy to use, and fast in response speed.

[0053] Preferably, in this embodiment and in Embodiment 1, two static contact pieces 2 and the first moving contact 411 can be provided respectively. Two second moving contacts 421 can also be provided in this embodiment, which can not only realize various forms of switch circuit connection, but also prevent the switch from malfunctioning when one of the static contact pieces 2 fails to contact the corresponding first moving contact 411 or second moving contact 421 properly, as the other static contact piece 2 can still ensure normal use of the switch.

[0054] The above embodiments can be arranged in several groups in sequence, and the turntables 5 in each group are controlled to be linked through a knob, which will not be elaborated in this embodiment.

[0055] Embodiment 3

[0056] When the switch opens or closes, the current in the circuit will suddenly interrupt or connect, which will generate a strong electric arc. If the electric arc is not extinguished in time, it will cause serious damage to the switchgear and power system, and even lead to dangers such as fire and explosion.

[0057] Therefore, as Figures 2-3 shown, on the basis of the above embodiments, in this embodiment, an arc extinguishing chamber 61 is provided on one side of the static contact piece 2, and several arc extinguishing plates 62 are provided in the arc extinguishing chamber 61. The working principle of the arc extinguishing chamber 61 is to use the energy of the electric arc to generate air flow or magnetic field, so as to extinguish the electric arc. Specifically, the arc extinguishing chamber 61 is usually composed of two metal plates, and a gas gap is formed between them. When the electric arc is generated, the gas in the gas gap is heated, generating a strong air flow. These air flows blow out the electric arc, thus achieving the purpose of extinguishing the electric arc. It has the advantages of fast speed, high reliability and long service life.

[0058] An arc guiding piece 63 is provided on one side of the arc extinguishing chamber 61, which can play a role in guiding the electric arc to a specified area and improving the arc extinguishing effect.

[0059] If it is applied to a small DC isolation universal switch, in order to fix each arc extinguishing structure, a square groove can be provided in the center of the moving contact piece, and a housing for installing structures such as the arc extinguishing chamber 61 can be provided. The housing can be adapted to the square groove. Elastic pieces (i.e., the ends of the static contacts) are provided on the two static contacts. When the position of the moving contact piece changes under the action of the knob, the moving contact piece is buckled with the elastic pieces on the static contacts to form a moving contact assembly. The touch piece type contact switch has a fast response speed, can quickly disconnect the circuit, reduce the generation and duration of the electric arc, and improve the service life of the product.

[0060] Since electric arcs will be generated when the contacts separate or close, generating excessive heat and sparks, in this embodiment, a heat dissipation channel 7 communicating with the outside is provided on one side of the static contact piece 2, and heat dissipation holes are opened on the housing, which can quickly discharge the heat and reduce potential safety hazards.

[0061] In addition, in this embodiment, a magnetic block can be selectively provided to extinguish the arc by using the force of the magnetic field on the current. The arc is accurately guided to the arc extinguishing chamber 61 by the magnetic field generated by the magnet, and the arc is extinguished by the arc extinguishing piece 62. After the arc enters the arc extinguishing chamber 61, it contacts the solid medium and is cooled and extinguished. This can effectively reduce the damage of the arc to the equipment, protect the safety of the equipment, and ensure the normal operation of the circuit. This embodiment will not be elaborated here.

[0062] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A transfer switch, comprising a rotating shaft (1) and a stationary contact piece (2), characterized in that: It comprises a first corrugated spring piece (31), a first movable contact piece (41) linked to the rotating shaft (1), and a first spring piece cover (51) used for pressing the first movable contact piece (41) towards the stationary contact piece (2), wherein the first movable contact piece (41) is located above or below the stationary contact piece (2) and is separated from or elastically abutted against the stationary contact piece (2) by rotation; The first corrugated spring sheet (31) is located between the first spring sheet cover (51) and the first movable contact sheet (41).

2. A transfer switch according to claim 1, characterized in that: The first moving contact piece (41) comprises a first contact piece seat (412) and a first moving contact (411), and the first moving contact (411) is located on the side of the first contact piece seat (412).

3. A transfer switch according to claim 1, characterized in that: The first corrugated spring piece (31) comprises a plurality of lower spring piece parts (312) with a "︺"-shaped cross section and a plurality of upper spring piece parts (311) with a "︹"-shaped cross section, wherein the lower spring piece parts (312) and the upper spring piece parts (311) are arranged alternately and connected end to end to form a wave-shaped structure; Furthermore, each of the lower elastic sheet parts (312) and each of the upper elastic sheet parts (311) surround each other to form an annular structure.

4. A transfer switch according to claim 3, characterized in that: The axial projection surfaces of the lower elastic sheet portion (312) and the upper elastic sheet portion (311) are both isosceles trapezoidal structures, and the corners of the lower elastic sheet portion (312) and the corners of the upper elastic sheet portion (311) are both rounded.

5. A transfer switch according to claim 4, characterized in that: It comprises a second movable contact piece (42) having the same structure as the first movable contact piece (41), a second corrugated spring piece (32) having the same structure as the first corrugated spring piece (31), and a second spring piece cover (52); the second movable contact piece (42) is linked to the rotating shaft (1); The second movable contact piece (42) is located on the side of the stationary contact piece (2) facing away from the first movable contact piece (41), the second corrugated spring piece (32) is located on the side of the second movable contact piece (42) facing away from the stationary contact piece (2), and the second spring piece cover (52) presses the second corrugated spring piece (32) towards the second movable contact piece (42); The second moving contact piece (42) comprises a second moving contact (421), and the first moving contact (411) and the second moving contact (421) are respectively located on the upper and lower surfaces of the stationary contact piece (2).

6. A transfer switch according to claim 5, characterized in that: The first corrugated spring piece (31) and the second corrugated spring piece (32) are both made of high manganese steel.

7. A transfer switch according to claim 5, characterized in that: The edges of the upper and lower surfaces of the static contact piece (2) are both provided with guide surfaces; Rounded corners are provided on both sides of the contact surface between the first moving contact piece (41) and the stationary contact piece (2), and on both sides of the contact surface between the second moving contact piece (42) and the stationary contact piece (2).

8. A transfer switch according to claim 5, characterized in that: It comprises a rotating disk (5) clamped with a rotating shaft (1), the first moving contact piece (41) and the second moving contact piece (42) are respectively embedded at two ends of the rotating disk (5), and a circular groove (53) for a stationary contact piece (2) to pass through is opened on the side of the rotating disk (5); The first elastic sheet cover (51) and the second elastic sheet cover (52) are respectively located at two ends of the rotating disk (5) and are fixedly connected to the rotating disk (5).

9. A transfer switch according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8, characterized in that: An arc extinguishing chamber (61) is provided on one side of the stationary contact piece (2), and a plurality of arc extinguishing pieces (62) are provided in the arc extinguishing chamber (61); An arc striking piece (63) is provided on one side of the arc extinguishing chamber (61).

10. A transfer switch according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8, characterized in that: A heat dissipation channel (7) communicating with the outside is provided on one side of the stationary contact piece (2).

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