CN111370242A - Dual-power switch contact structure - Google Patents

Abstract

The invention discloses a dual-power switch contact structure, which comprises a rotating shaft, a moving contact, a first contact, a second contact and a third contact, wherein when a main power supply and a standby power supply are switched, when one contact end of the moving contact is disconnected with the first contact, the other contact end of the moving contact is always kept in contact with a transition structure of the third contact, so that an electric arc is generated only at the disconnected contact end of the moving contact and the first contact, the two contact ends are in contact with the transition structure together, the electric arc is extinguished in the process that the two contact ends are in contact with the transition structure, the other contact end is driven to be separated from the transition structure to be connected with the second contact along with the continuous rotation of the moving contact, the electric arc can be prevented from being generated at the two ends of the moving contact simultaneously when the main power supply and the standby power supply are switched by a dual-power switch, and the short circuit fault, the safety and the reliability of the product use are improved.

Description

Dual-power switch contact structure

Technical Field

The invention relates to the technical field of low-voltage appliances, in particular to a dual-power switch contact structure.

Background

The dual-power switch is used for avoiding a fault power supply from supplying power to a load when a main power supply fails in a power supply system, and can reliably select a qualified power supply to be put into normal operation so as to ensure that the power supply is uninterrupted. When the contact structure opens a circuit in the atmosphere, as long as the voltage exceeds 12-20V, the cut-off current exceeds 0.25-1A, an electric arc is usually generated in a contact gap (also called an arc gap) to keep the current on, the contact is not cut off until the electric arc is extinguished, the contact gap becomes insulating medium current, the contact is burnt by the high temperature of the electric arc, and copper ions are left on the surface of the contact after the electric arc is extinguished.

For example, chinese patent document CN203070945U discloses a contact device of a dual power switch, which includes a moving contact and a static contact, wherein the static contact includes two contact pieces, the moving contact includes two moving contact pieces, the two moving contact pieces form a V shape, the moving contact is fixed on an insulating rotating shaft controlled by a transmission mechanism, the static contact includes a static contact a for a main power inlet wire, a static contact b for a standby power inlet wire, and a static contact c for an outlet wire, the static contact a and the static contact b are fixed on an insulating base, and the static contact c is fixed on an inner side of an insulating cover plate of the dual power switch.

The contact device of the dual-power switch still has the following problems in practical use:

1. the contact area of the moving contact and the static contact is wide when the circuit is disconnected, the generated electric arc can burn the surface of the whole static contact, so that copper ions are distributed in a plurality of places of the static contact to interfere the opening and closing of the moving contact and the static contact, and the moving contact and the static contact can not be closed in place in serious cases, so that the contact of a switch is poor, and potential safety hazards exist; 2. when switching main power supply and stand-by power supply, the both ends of moving contact have the electric arc to produce with the static contact when breaking apart, and at the in-process of fast switch over, the both ends that probably can appear the moving contact appear the electric arc simultaneously and make three static contact short circuits, lead to main power supply and stand-by power supply short circuit to break down, have the potential safety hazard.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the problem that when a dual-power switch in the prior art is used for rapidly switching a power supply, electric arcs possibly occur at two ends of a movable contact simultaneously to enable three fixed contacts to be in short circuit, so that short circuit faults occur on a main power supply and a standby power supply, and therefore, the dual-power switch contact structure which is reliable in use and installation and cannot generate short circuit accidents when the main power supply and the standby power supply are switched is provided.

The invention provides a dual-power switch contact structure, comprising:

the moving contact component comprises a rotating shaft which is rotatably arranged on the switch shell and a moving contact which is arranged on the rotating shaft in a linkage manner, and the moving contact comprises two contact ends which extend out of the side wall of the rotating shaft in a back-to-back manner;

the movable contact is driven by the rotating shaft to rotate between the third contact and the first contact or the second contact, the third contact comprises a transition structure partially overlapped with a rotating path of the movable contact, and the movable contact drives at least one contact end to be always in sliding contact with the transition structure in the rotating process; the moving contact is provided with a switching-on state for driving the two contact ends to be respectively connected with the first contact and the third contact or connected with the second contact and the third contact, and a switching-off state for driving the two contact ends to be connected with the transition structure and disconnected with the first contact or the second contact.

In the dual-power switch contact structure, the transition structure is an arc-shaped protrusion formed by bending and extending one end of the third contact to two sides.

In the dual-power switch contact structure, an arc extinguishing structure is arranged between the first contact or the second contact and the third contact, the arc extinguishing structure comprises a contact protrusion arranged at one end of the first contact or the second contact and facing the moving contact, and an arc extinguishing grid sheet component arranged close to the contact protrusion along the rotating path of the moving contact, and the contact protrusion guides the arc generated by the separation of the contact protrusion and the moving contact to the arc extinguishing grid sheet component in a concentrated manner.

In the dual-power switch contact structure, the contact protrusion and the end of the first contact or the second contact are arranged in an L-shaped structure, the arc-extinguishing grid plate component comprises a concave opening suitable for the contact end of the moving contact to rotate and pass through, and the contact protrusion extends into the concave opening.

In the dual-power switch contact structure, two guide inclined planes extending towards the end parts of the contact protrusions are arranged on two sides of the contact protrusions, and two inclined grooves arranged on the same side with the guide inclined planes are arranged at the connecting parts of the contact protrusions and the second contacts or the third contacts.

In the dual-power switch contact structure, the moving contact is deviated through a mounting structure, the axis of the rotating shaft is arranged on the rotating shaft, the mounting structure comprises a deviation, the axis radially penetrates through a mounting through groove in the side wall of the rotating shaft, the moving contact is arranged in the mounting through groove in a penetrating mode, and the moving contact structure is arranged between the mounting through groove and the moving contact in a supporting and pressing mode.

In the dual-power switch contact structure, the moving contact comprises two moving contact pieces which are oppositely arranged on the rotating shaft from top to bottom, the rotating shaft is provided with two installation through grooves corresponding to the two moving contact pieces in parallel, the moving contact pieces are provided with two contact ends extending out of two ends of the installation through grooves and installation plate parts connecting the two contact ends, and a limiting structure for keeping the relative positions of the installation through grooves and the moving contact pieces fixed is arranged between the installation through grooves and the moving contact pieces.

In the dual-power switch contact structure, the limiting structure comprises a limiting groove which is arranged at the bottom of the installation through groove and is suitable for accommodating the installation plate part, a positioning bulge is arranged at the middle position of one side of the limiting groove far away from the axial lead, and a positioning groove matched with the positioning bulge is arranged on the installation plate part.

In the dual-power switch contact structure, the installation through groove comprises a connecting groove arranged above the limiting groove, the positioning protrusion extends into the connecting groove from the limiting groove, and the width of the connecting groove is larger than that of the limiting groove and is suitable for the movable contact piece to pass through.

In the dual-power switch contact structure, the elastic structure includes two metal elastic pieces which respectively apply opposite and close biasing forces to the two movable contact pieces, the metal elastic pieces include a flat plate part which is attached to the top of the installation through groove, and two elastic press feet which are obliquely connected to two ends of the flat plate part, and the two elastic press feet respectively press and contact the two contact ends, so that an installation gap is reserved between the flat plate part and the movable contact pieces; two limiting protrusions are formed between two ends of the flat plate part and the two elastic pressing feet, an installation platform which is connected with the flat plate part in a matched mode is arranged at the top of the installation through groove, and the two limiting protrusions are abutted and limited at two ends of the installation platform.

Compared with the prior art, the technical scheme of the invention has the following advantages:

1. in the dual-power switch contact structure provided by the invention, a first contact, a second contact and a third contact are arranged on the switch shell at intervals along the circumferential direction of the rotating shaft, the moving contact can be in switching-on contact with the first contact and the third contact under the driving of the rotating shaft, and can also be switched into switching-on contact with the second contact and the third contact, so that the direct switching between a main power supply and a standby power supply is realized, in the switching process, when one contact end of the moving contact is disconnected with the first contact, the other contact end of the moving contact is always kept in contact with the transition structure of the third contact, therefore, an electric arc can be generated only at the disconnected contact end of the moving contact and the first contact, and the two contact ends are in contact with the transition structure together, so that the electric arc can be extinguished in the process that the two contact ends are in contact with the transition structure, the moving contact is driven to separate from the transition structure and be connected with the second contact along with the continuous rotation of the moving contact, so that the moving contact can rotate in a reciprocating mode among the first contact, the second contact and the third contact to achieve switching-on and switching-off actions.

2. In the dual-power switch contact structure provided by the invention, the transition structure is an arc-shaped bulge formed by bending and extending one end of the third contact to two sides along the rotating path of the moving contact, and the arc-shaped bulge extends to two sides for a set length according to the distance between the third contact and the first contact as well as the second contact, so that the arc-extinguishing distances between the first contact and the third contact as well as between the second contact and the third contact can be ensured to be the same, thus not only meeting the arc-extinguishing requirement when a main power supply and a standby power supply are disconnected, but also enabling one contact end of the moving contact to be always jointed with the arc-shaped bulge, avoiding the simultaneous generation of electric arcs at two ends of the moving contact, and having reasonable structural design and high safety.

3. In the dual-power switch contact structure provided by the invention, the contact bulge facing the moving contact is arranged at one end of the first contact or the second contact, the arc extinguishing grid sheet component close to the contact bulge is arranged along the rotating path of the moving contact, so that the moving contact is separated from the position of the contact bulge when being disconnected with the first contact or the second contact, an electric arc is generated, the electric arc is intensively guided to the arc extinguishing grid sheet component through the contact bulge, the arc extinguishing grid sheet component divides the long electric arc into a plurality of short electric arcs, the contact area of the electric arc and air is enlarged, the cooling speed of the electric arc is faster, the arc extinguishing speed of the contact structure is improved, and the contact bulge can also be applied to the static contact of the isolating switch.

4. In the dual-power switch contact structure provided by the invention, the contact bulge and the end part of the first contact or the second contact are arranged in an L structure and extend into the concave opening of the arc-extinguishing grid piece component, and the side wall of the contact bulge is closer to the arc-extinguishing grid piece component by the structural design, so that electric arcs generated when the moving contact and the first contact or the second contact are disconnected can be transmitted to the arc-extinguishing grid piece component through the side wall of the contact bulge, and simultaneously, copper ions generated after the electric arcs are cooled are concentrated on the side wall of the contact bulge, so that the problem that the copper ions are generated on the surface of the static contact and interfere with the switching-on and switching-off of the moving contact and the static contact can be avoided.

5. In the dual-power switch contact structure provided by the invention, two guiding inclined planes extending and closing to the end parts of the contact protrusions are arranged on two sides of the contact protrusions, the contact end is firstly contacted with the contact protrusions along the guiding inclined planes and then is gradually contacted with the second contact or the third contact, the movable contact contacted with the first contact or the second contact is disconnected with the surfaces of the contact protrusions by arranging two inclined grooves at the connecting parts of the contact protrusions and the second contact or the third contact, so that the movable contact is completely contacted with the first contact or the second contact, the conductivity is improved, when the movable contact is separated and disconnected from the second contact or the first contact, the contact end is firstly disconnected with the surfaces of the first contact or the second contact through the inclined grooves, and at the moment, the contact end is only contacted with the surfaces of the contact protrusions, ensuring that an arc generated by the separation of the movable contact from the first contact or the second contact is concentrated on the contact bulge.

6. In the dual-power switch contact structure provided by the invention, when the movable contact piece is installed, the movable contact piece is firstly inserted into the connecting groove of the installation through groove, then the installation plate part of the movable contact piece is pressed into the limiting groove, and the positioning groove on the movable contact piece is aligned and connected with the positioning bulge in the connecting groove.

7. In the dual-power switch contact structure provided by the invention, the metal elastic sheet can increase the installation contact surface of the metal elastic sheet through the flat plate part, so that the installation stress of the metal elastic sheet in the installation through groove is ensured to be stable, and the two elastic press feet obliquely arranged at the two ends of the flat plate part abut against the two contact ends so as to apply a biasing force to the contact end, so that the movable contact is reliably installed in the limiting groove under the action of the metal elastic sheet, the contact end can be kept in close contact with the static contact component, and the contact pressure of the movable contact is enhanced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic structural diagram of a dual power switch contact structure according to the present invention after a housing is hidden;

FIG. 2 is a front view of a dual power switch contact configuration provided by the present invention;

FIG. 3 is a partially enlarged schematic view of a contact bump according to the present invention;

FIG. 4 is a schematic structural diagram of a rotating shaft according to the present invention;

fig. 5 is a schematic structural view of a moving contact and a metal spring plate according to the present invention;

FIG. 6 is a schematic cross-sectional view of the movable contact assembly of the present invention;

description of reference numerals:

1-a rotating shaft;

2-moving contact; 21-a contact end; 22-moving contact piece; 23-a mounting plate portion; 24-a positioning groove;

31-a first contact; 32-a second contact; 33-a third contact; 34-a transition structure;

4-arc extinguishing structure; 41-contact projection; 42-arc chute blade assembly; 43-concave opening; 44-a guide ramp; 45-chute;

5, installing a through groove; 51-a limiting groove; 52-connecting groove; 53-positioning protrusions; 54-a mounting platform;

6-metal shrapnel; 61-a flat plate portion; 62-elastic presser foot; 63-installation clearance; 64-limit bump.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1

The present embodiment provides a dual power switch contact structure as shown in fig. 1-6, including:

the moving contact component comprises a rotating shaft 1 which is rotatably arranged on the switch shell and a moving contact 2 which is arranged on the rotating shaft 1 in a linkage manner, wherein the moving contact 2 comprises two contact ends 21 which extend out of the side wall of the rotating shaft 1 in a back-to-back manner;

the fixed contact assembly comprises a first contact 31, a second contact 32 and a third contact 33 which are arranged on the switch shell at intervals along the circumferential direction of the rotating shaft 1, the movable contact 2 is driven by the rotating shaft 1 to rotate between the third contact 33 and the first contact 31 or the second contact 32, the third contact 33 comprises a transition structure 34 which is partially overlapped with the rotating path of the movable contact 2, and the movable contact 2 drives at least one contact end 21 to be always in sliding contact with the transition structure 34 in the rotating process; the movable contact 2 has a closing state for driving the two contact ends 21 to be respectively connected with the first contact 31 and the third contact 33 or connected with the second contact 32 and the third contact 33, and an opening state for driving the two contact ends 21 to be connected with the transition structure 34 and disconnected from the first contact 31 or the second contact 32.

The above-mentioned embodiment is a core technical solution of this embodiment, the first contact 31, the second contact 32, and the third contact 33 are arranged on the switch housing at intervals along the circumferential direction of the rotating shaft 1, the movable contact 2 is driven by the rotating shaft 1 to be capable of being in closing contact with the first contact 31 and the third contact 33, and also to be switched to be in closing contact with the second contact 32 and the third contact 33, so as to realize direct switching between a main power supply and a standby power supply, in the switching process, when one contact end 21 of the movable contact 2 is disconnected from the first contact 31, the other contact end 21 is always kept in contact with the transition structure 34 of the third contact 33, so that an arc is generated only at the disconnected contact end 21 of the movable contact 2 and the first contact 31, and is contacted on the transition structure 34 through the two contact ends 21, so that the arc is extinguished in the process that the two contact ends 21 are contacted with the transition structure 34, with the continuous rotation of the moving contact 2, the other contact end 21 is driven to be separated from the transition structure 34 and connected with the second contact 32, so that the moving contact 2 can rotate between the first contact, the second contact and the third contact in a reciprocating manner to realize the switching-on and switching-off actions.

As shown in fig. 1 and 2, the transition structure 34 is an arc-shaped protrusion formed by bending and extending one end of the third contact 33 to two sides along a rotation path of the movable contact 2, and the arc-shaped protrusion extends to two sides by a set length according to a distance between the third contact 33 and the first contact 31 and the second contact 32, so that arc extinguishing distances between the first contact 31 and the second contact 32 and the third contact 33 are the same, which not only can meet arc extinguishing requirements when a main power source and a standby power source are disconnected, but also can keep one contact end 21 of the movable contact 2 engaged with the arc-shaped protrusion all the time, so that arcs are not generated at two ends of the movable contact 2 at the same time, and has reasonable structural design and high safety, in this embodiment, the first contact 31 and the second contact 32 are symmetrically arranged at two sides of the third contact 33, in this case, the transition structure 34 is an arc-shaped protrusion extending symmetrically from one end of the third contact 33 to two sides.

An arc extinguishing structure 4 is disposed between the first contact 31 or the second contact 32 and the third contact 33, and the following detailed description is made on the specific arrangement of the arc extinguishing structure 4 with reference to fig. 1 to 3:

the arc extinguishing structure 4 comprises a contact protrusion 41 which is arranged at one end of the first contact 31 or the second contact 32 and faces the movable contact 2, and an arc extinguishing grid assembly 42 which is arranged close to the contact protrusion 41 along the rotation path of the movable contact 2, so that the movable contact 2 is separated from the position of the contact protrusion 41 and generates an arc when being disconnected with the first contact 31 or the second contact 32, the arc is intensively guided onto the arc extinguishing grid assembly 42 through the contact protrusion 41, the arc extinguishing grid assembly 42 divides the long arc into a plurality of short arcs, the contact area of the arc and air is enlarged, the cooling speed of the arc is faster, and the arc extinguishing speed of the contact structure is improved.

As shown in fig. 1, the end portions of the contact protrusion 41 and the first contact 31 or the second contact 32 are arranged in an L-shaped structure and extend into the concave opening 43 of the arc-extinguishing grid plate assembly 42, and this structural design makes the sidewall of the contact protrusion 41 closer to the arc-extinguishing grid plate assembly 42, so as to ensure that the arc generated when the moving contact 2 and the first contact 31 or the second contact 32 are disconnected can be transmitted to the arc-extinguishing grid plate assembly 42 through the sidewall of the contact protrusion 41, and meanwhile, copper ions generated after the arc is cooled are concentrated on the sidewall of the contact protrusion 41, so that the problem that the copper ions are generated on the surface of a stationary contact to cause interference on the switching-off and switching-on of the moving contact 2 and the stationary contact can be avoided.

In order to increase the joint speed of the movable contact 2 and the fixed contact assembly, two guiding inclined planes 44 extending and closing to the end parts of the contact protrusions 41 are arranged on two sides of the contact protrusion 41, the contact end 21 is firstly contacted with the contact protrusion 41 along the guiding inclined planes 44 and then is gradually contacted with the second contact 32 or the third contact 33, two inclined grooves 45 are arranged at the joint of the contact protrusion 41 and the second contact 32 or the third contact 33, so that the movable contact 2 contacted with the first contact 31 or the second contact 32 can be disconnected with the surface of the contact protrusion 41, thereby realizing the complete contact between the movable contact 2 and the first contact 31 or the second contact 32, improving the conductivity, and when the movable contact 2 is separated and disconnected from the second contact 32 or the first contact 31, the contact end 21 is firstly disconnected from the surface of the first contact 31 or the second contact 32 through the inclined grooves 45, the contact end 21 is only in surface contact with the contact protrusion 41, so that the arc generated by the separation of the movable contact 2 from the first contact 31 or the second contact 32 is concentrated on the contact protrusion 41, and the arc extinguishing structure 4 can be further adapted to an isolating switch.

As shown in fig. 1, the moving contact 2 is disposed on the rotating shaft 1 by deviating from the axial line of the rotating shaft 1 through a mounting structure, and this eccentric structure design can ensure that one of the contact ends 21 is always engaged with the arc-shaped protrusion during the rotation of the moving contact 2, and at the same time, the arc length of the arc-shaped protrusion can be reduced, and the arc extinguishing distance between the arc-shaped protrusion and the first contact 31 or the second contact 32 is extended.

The specific arrangement of the mounting structure is described in detail below with reference to fig. 4-6:

the mounting structure comprises a mounting through groove 5 which deviates from the axial lead and radially penetrates through the side wall of the rotating shaft 1, the moving contact 2 is arranged in the mounting through groove 5 in a penetrating mode, the mounting structure further comprises an elastic structure which is arranged between the mounting through groove 5 and the moving contact 2 in a pressing mode, the mounting through groove 5 provides a position required by mounting for the moving contact 2, the elastic structure is utilized to apply biasing force to the moving contact 2, the moving contact 2 is reliably mounted in the mounting through groove 5, and continuous and reliable contact pressure can be applied to a static contact component.

As shown in fig. 4-5, the movable contact 2 includes two movable contact pieces 22 disposed on the rotating shaft 1 in an up-down opposite manner, the fixed contact assembly is clamped by the two movable contact pieces 22 to realize electrical connection, two installation through slots 5 are disposed in parallel on the rotating shaft 1 corresponding to the two movable contact pieces 22, and as shown in fig. 5, the movable contact piece 22 has two contact ends 21 extending out of two ends of the installation through slot 5, and an installation plate portion 23 connecting the two contact ends 21.

In order to ensure the stability of the installation position of the movable contact piece 22 in the installation through groove 5, a limit structure for keeping the relative position of the installation through groove 5 and the movable contact piece 22 fixed is arranged between the installation through groove 5 and the movable contact piece 22, the limit structure comprises a limit groove 51 which is arranged at the bottom of the installation through groove 5 and is suitable for accommodating the installation plate part 23, the movable contact piece 22 is limited to shift left and right in the installation through groove 5 by the limit groove 51, a positioning bulge 53 is arranged at the middle position of one side of the limit groove 51 far away from the axial lead, the installation plate part 23 is provided with a positioning groove 24 matched with the positioning bulge 53, the movable contact piece 22 is prevented from moving back and forth along the extension direction of the limit groove 51 by the matching and the abutting of the positioning groove 24 and the positioning bulge 53, meanwhile, the movable contact piece can be quickly positioned when being installed, the mounting distance of the two contact ends extending out of the mounting through groove is ensured to be the same, so that the two contact ends are ensured to have the same rotating track and can be jointed with the arc-shaped bulge.

In order to enable the movable contact 22 to pass through the installation through slot 5, as shown in fig. 4, the installation through slot 5 includes a connecting slot 52 disposed above the limiting slot 51, the positioning protrusion 53 extends from the limiting slot 51 into the connecting slot 52, and the width of the connecting slot 52 is greater than the width of the limiting slot 51 and is suitable for the movable contact 22 to pass through.

As shown in fig. 5-6, the elastic structure includes two metal elastic sheets 6 for applying opposite and close biasing force to the two movable contact pieces 22, the metal elastic sheets 6 include a flat plate portion 61 attached to the top of the installation through slot 5, and two elastic press feet 62 obliquely connected to two ends of the flat plate portion 61, the two elastic press feet 62 respectively press and contact the two contact ends 21, and an installation gap 63 is left between the flat plate portion 61 and the movable contact piece 22, the installation contact surface of the metal elastic sheet 6 is enlarged by the flat plate portion 61, so as to ensure stable installation stress of the metal elastic sheet 6, and meanwhile, the elastic press feet 62 apply biasing force to the contact ends 21, so that the movable contact piece 22 is reliably installed in the limiting slot 51 under the action of the metal elastic sheet 6, and the contact ends 21 can keep close contact with the fixed contact assembly, further, two limiting protrusions 64 are formed between two ends of the flat plate portion 61 and the two elastic presser feet 62, the top of the installation through groove 5 is provided with an installation platform 54 connected with the flat plate portion 61 in a matched mode, the two limiting protrusions 64 are abutted and limited at two ends of the installation platform 54, so that the relative installation position of the metal elastic sheet 6 in the installation through groove 5 is limited, the installation limiting effect is achieved, the metal elastic sheet 6 is prevented from being separated from the installation through groove 5 when being stressed, and the installation stability of the metal elastic sheet 6 is improved.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims (10)

1. A dual power switch contact structure, comprising:

the moving contact component comprises a rotating shaft (1) which is rotatably arranged on the switch shell and a moving contact (2) which is arranged on the rotating shaft (1) in a linkage manner, wherein the moving contact (2) comprises two contact ends (21) which extend out of the side wall of the rotating shaft (1) in a back direction;

the fixed contact assembly comprises a first contact (31), a second contact (32) and a third contact (33) which are arranged on the switch shell at intervals along the circumferential direction of the rotating shaft (1), the movable contact (2) is driven by the rotating shaft (1) to rotate between the third contact (33) and the first contact (31) or the second contact (32), the third contact (33) comprises a transition structure (34) partially overlapped with the rotating path of the movable contact (2), and the movable contact (2) drives at least one contact end (21) to be always in sliding contact with the transition structure (34) in the rotating process; the moving contact (2) is provided with a switching-on state for driving the two contact ends (21) to be respectively connected with the first contact (31) and the third contact (33) or the second contact (32) and the third contact (33), and a switching-off state for driving the two contact ends (21) to be connected with the transition structure (34) and disconnected with the first contact (31) or the second contact (32).

2. The dual-power switch contact structure of claim 1, wherein the transition structure (34) is an arc-shaped protrusion formed by bending and extending one end of the third contact (33) to two sides.

3. The dual-power switch contact structure according to claim 1 or 2, wherein an arc extinguishing structure (4) is arranged between the first contact (31) or the second contact (32) and the third contact (33), the arc extinguishing structure (4) comprises a contact protrusion (41) which is arranged at one end of the first contact (31) or the second contact (32) and faces the movable contact (2), and an arc extinguishing grid piece component (42) which is arranged close to the contact protrusion (41) along a rotation path of the movable contact (2), and the arc generated by the separation of the contact protrusion (41) and the movable contact (2) is intensively guided to the arc extinguishing grid piece component (42).

4. The dual-power switch contact structure of claim 3, wherein the contact protrusion (41) and the end of the first contact (31) or the second contact (32) are arranged in an L-shaped structure, the arc chute assembly (42) comprises a concave opening (43) suitable for the contact end (21) of the movable contact (2) to rotate through, and the contact protrusion (41) extends into the concave opening (43).

5. The dual-power switch contact structure of claim 4, wherein two guiding inclined planes (44) extending towards the ends of the contact protrusion (41) are arranged on two sides of the contact protrusion, and two inclined slots (45) arranged on the same side as the guiding inclined planes (44) are arranged at the connection position of the contact protrusion (41) and the second contact (32) or the third contact (33).

6. The dual-power switch contact structure according to any one of claims 1-5, wherein the moving contact (2) is disposed on the rotating shaft (1) by deviating from an axial line of the rotating shaft (1) through a mounting structure, the mounting structure comprises a mounting through groove (5) deviating from the axial line and radially penetrating through a side wall of the rotating shaft (1), the moving contact (2) is disposed in the mounting through groove (5), and the dual-power switch contact structure further comprises an elastic structure disposed between the mounting through groove (5) and the moving contact (2) in a pressing manner.

7. The dual-power switch contact structure of claim 6, wherein the movable contact (2) comprises two movable contact pieces (22) oppositely arranged on the rotating shaft (1) from top to bottom, the rotating shaft (1) is provided with two mounting through grooves (5) in parallel corresponding to the two movable contact pieces (22), the movable contact pieces (22) are provided with two contact ends (21) extending out of two ends of the mounting through grooves (5) and a mounting plate part (23) connecting the two contact ends (21), and a limiting structure for keeping the relative positions of the two movable contact pieces (22) fixed is arranged between the mounting through grooves (5).

8. The dual-power switch contact structure of claim 7, wherein the limiting structure comprises a limiting groove (51) which is arranged at the bottom of the installation through groove (5) and is suitable for accommodating the installation plate part (23), a positioning protrusion (53) is arranged in the middle of the limiting groove (51) on one side far away from the axis, and a positioning groove (24) matched with the positioning protrusion (53) is arranged on the installation plate part (23).

9. The dual power switch contact structure of claim 8, wherein the mounting through slot (5) comprises a connecting slot (52) disposed above the limiting slot (51), the positioning protrusion (53) extends from the limiting slot (51) into the connecting slot (52), and the connecting slot (52) has a width larger than that of the limiting slot (51) and is suitable for the movable contact (22) to pass through.

10. The dual-power switch contact structure of claim 6, wherein the elastic structure comprises two metal spring plates (6) which respectively apply bias force to the two movable contact pieces (22) to approach each other in opposite directions, the metal spring plates (6) comprise flat plate portions (61) which are connected with the tops of the installation through grooves (5) in an attaching mode, and two elastic press feet (62) which are obliquely connected to two ends of the flat plate portions (61), and the two elastic press feet (62) respectively press and contact the two contact ends (21) so that installation gaps (63) are reserved between the flat plate portions (61) and the movable contact pieces (22); two limiting protrusions (64) are formed between two ends of the flat plate portion (61) and the two elastic pressure feet (62), an installation platform (54) which is connected with the flat plate portion (61) in a matched mode is arranged at the top of the installation through groove (5), and the two limiting protrusions (64) are abutted and limited at two ends of the installation platform (54).

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