Key type overload protection wiring switch

Abstract

The utility model discloses a button type overload protection wiring switch, comprising a main housing; a pressing seat and a base; a reset rod corresponding to the bimetallic strip is arranged at the position, close to the right end, of the bottom of the pressing base, a quick connecting piece is arranged on the rear side of the base in a clamped mode, and three wiring frames with screws are arranged on the quick connecting piece. A bending static contact piece is arranged on the right side of the bimetallic strip, a vertical groove matched with the bending static contact piece is formed in the base, and a transverse groove matched with the bending static contact piece is formed in one side of the vertical groove. The button type overload protection wiring switch is reasonable in structural design, the reset rod used for recovering the original state of the bimetallic static contact piece is directly designed on the pressing seat, and the bent zero line contact piece is also adjusted from the existing transverse installation scheme to the installation scheme combining transverse arrangement and vertical arrangement, so that the structure of the overload switch is simpler, and the reliability of the overload switch is improved. Assembly is more efficient, work is more stable, and the appearance is more exquisite.

Description

TECHNICAL FIELD

[0001] The utility model relates to a key type overload protection wiring switch. BACKGROUND

[0002] At present, key switch is widely used in the field of household appliances and other electrical appliances, and is especially suitable for being used in a cord board. The key switch realizes disconnection of a circuit by using a bimetallic static contact to heat and bend to separate from a dynamic contact. After overload protection, when the bimetallic static contact needs to be restored to a normal state, an additional push rod device is used to press the bimetallic static contact to restore the original state, or a push rod device is synchronously designed in a switch pressing assembly to press the bimetallic static contact to restore the original state. Both of the two schemes need to install a spring on the push rod to realize return of the push rod, and the structures are relatively complex, occupy a large space, and are complex in assembly and unstable in work. SUMMARY

[0003] The utility model overcomes the insufficient of prior art, provides a key type overload protection wiring switch.

[0004] In order to solve the above technical problems, the utility model adopts the technical scheme of a key type overload protection wiring switch, which comprises:

[0005] A main shell;

[0006] A pressing seat arranged above the main shell, a indicating lamp circuit board and two pressing springs arranged below the pressing seat, and the main shell connected with the pressing seat through two supporting legs;

[0007] A base arranged below the pressing seat, a dynamic contact and a bimetallic sheet arranged in the base, an upper gear and a lower gear arranged above the dynamic contact and matched with each other, and the top end of the upper gear in contact with the pressing seat;

[0008] The utility model is characterized in that a reset rod corresponding to the bimetallic sheet is arranged at the bottom of the pressing seat close to the right end, a quick connector is clamped at the rear side of the base, three wire frames with screws are arranged on the quick connector, a bent static contact is arranged at the right side of the bimetallic sheet, a vertical groove matched with the bent static contact is arranged on the base, and an arc-shaped groove matched with the bent static contact is arranged on the inner wall of the vertical groove.

[0009] In the above structure, a dynamic contact clamping groove matched with the dynamic contact is arranged in the base, and a bimetallic sheet clamping groove matched with the bimetallic sheet is arranged at the right side of the dynamic contact clamping groove.

[0010] In the above structure, an arc-shaped groove is arranged on the inner wall of the vertical groove, and an arc-shaped protrusion matched with the arc-shaped groove is arranged on the left end side wall of the bent static contact.

[0011] Compared with the prior art, the key type overload protection wiring switch has the advantages that the reset rod for restoring the original state of the bimetallic static contact piece is directly designed on the pressing seat, a push rod is no longer separately designed, a spring for returning the push rod is omitted, the reset rod is directly returned by using the spring below the pressing seat, in addition, the bent static contact piece is adjusted from the existing horizontal installation scheme to a combination of horizontal and vertical installation schemes, the structure of the overload switch is more simplified, assembly is more efficient, work is more stable, and the appearance is more exquisite. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is an exploded structural schematic view of the key type overload protection wiring switch according to an embodiment of the utility model;

[0013] Figure 2 is an assembly view of the key type overload protection wiring switch according to an embodiment of the utility model;

[0014] Figure 3 is a structural schematic view of a base in the key type overload protection wiring switch according to an embodiment of the utility model;

[0015] Figure 4 is a structural schematic view of a bent static contact piece in the key type overload protection wiring switch according to an embodiment of the utility model.

[0016] In the drawings:

[0017] 1, main shell; 2, pressing seat; 3, indicating lamp circuit board; 4, pressing spring; 5, supporting leg; 6, base; 7, moving contact piece; 8, bimetallic piece; 9, upper gear; 10, lower gear; 11, reset rod; 12, quick connector; 13, wiring frame; 14, bent static contact piece; 15, vertical groove; 16, horizontal groove; 17, moving contact piece clamping groove; 18, bimetallic piece clamping groove; 19, arc-shaped groove; 20, arc-shaped protrusion. DETAILED DESCRIPTION

[0018] The specific implementation of the utility model will be described in further detail below in combination with the drawings and embodiments. The following embodiments are used to illustrate the utility model, but are not used to limit the scope of the utility model.

[0019] As shown in Figures 1-4 , a key type overload protection wiring switch comprises:

[0020] a main shell 1;

[0021] a pressing seat 2 arranged above the main shell 1, the lower part of the pressing seat 2 being provided with an indicating lamp circuit board 3 and two pressing springs 4, and the main shell 1 being connected with the pressing seat 2 through two supporting legs 5.

[0022] The base 6 is arranged below the pressing seat 2, the moving contact 7 and the bimetallic strip 8 are arranged in the base 6, the upper gear 9 and the lower gear 10 are arranged above the moving contact 7, the top end of the upper gear 9 is in contact with the pressing seat 2;

[0023] The reset rod 11 corresponding to the bimetallic strip 8 is arranged at the bottom of the pressing seat 2 near the right end, the quick connecting piece 12 is clamped on the rear side of the base 6, three wire connecting frames 13 with screws are arranged on the quick connecting piece 12, the bent static contact 14 is arranged on the right side of the bimetallic strip 8, the vertical groove 15 corresponding to the bent static contact 14 is arranged on the base 6, and the horizontal groove 16 corresponding to the bent static contact 14 is arranged on one side of the vertical groove 15.

[0024] In the above structure, the moving contact clamping groove 17 corresponding to the moving contact 7 is arranged in the base 6, and the bimetallic strip clamping groove 18 corresponding to the bimetallic strip 8 is arranged on the right side of the moving contact clamping groove 17.

[0025] In the above structure, the arc-shaped groove 19 is arranged on the inner wall of the vertical groove 15, and the arc-shaped protrusion 20 corresponding to the arc-shaped groove 19 is arranged on the left end side wall of the bent static contact 14.

[0026] The key type overload protection wiring switch is mainly installed in the socket, the live wire in the socket is connected with the moving contact, the end of the bimetallic strip and the live wire outside the socket are inserted into the middle wire connecting frame, the end of the bent static contact and the zero line inside and outside the socket are inserted into the wire connecting frame on the right side, and the ground wire inside and outside the socket is inserted into the wire connecting frame on the left side.

[0027] The key type overload protection wiring switch has the advantages that the reset rod for restoring the original state of the bimetallic static contact is directly arranged on the pressing seat, the push rod is no longer separately designed, the spring for returning the push rod is omitted, the reset rod is directly returned by the spring below the pressing seat, the bent zero line contact is adjusted from the existing horizontal installation scheme to the combined horizontal and vertical installation scheme, the structure of the overload switch is more simple, the assembly is more efficient, the work is more stable, and the appearance is more beautiful.

[0028] The above only describes preferred embodiments of the utility model, and it should be noted that, for ordinary technical personnel in the technical field, without departing from the technical principle of the utility model, a plurality of improvements and modifications can be made, and the improvements and modifications should be regarded as the protection range of the utility model.

Claims

1. A key type overload protection terminal switch, comprising: a main housing (1); a pressing seat (2) arranged above the main housing (1), a indicating lamp circuit board (3) and two pressing springs (4) being arranged below the pressing seat (2), the main housing (1) being connected with the pressing seat (2) by two supporting legs (5); a base (6) arranged below the pressing seat (2), a movable contact (7) and a bimetallic strip (8) being arranged inside the base (6), an upper gear (9) and a lower gear (10) being arranged above the movable contact (7) and cooperating with each other, the top end of the upper gear (9) being in contact with the pressing seat (2); characterized in that a reset rod (11) corresponding to the bimetallic strip (8) is arranged at the bottom of the pressing seat (2) near the right end, a quick connecting piece (12) is arranged at the back side of the base (6), three wire connecting frames (13) with screws are arranged on the quick connecting piece (12); a bent static contact (14) is arranged at the right side of the bimetallic strip (8), a vertical slot (15) cooperating with the bent static contact (14) is arranged on the base (6), a horizontal slot (16) cooperating with the bent static contact (14) is arranged at one side of the vertical slot (15).

2. A key-operated overload protection switch according to claim 1, characterized in that: a movable contact slot (17) cooperating with the movable contact (7) is arranged inside the base (6), a bimetallic strip slot (18) cooperating with the bimetallic strip (8) is arranged at the right side of the movable contact slot (17).

3. The push-type overload protection terminal block switch of claim 1, wherein: an arc-shaped slot (19) is arranged on the inner wall of the vertical slot (15), an arc-shaped protrusion (20) cooperating with the arc-shaped slot (19) is arranged on the left end side wall of the bent static contact (14).

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