CN213781969U

CN213781969U - Overload safety structure of key switch

Info

Publication number: CN213781969U
Application number: CN202023059547.9U
Authority: CN
Inventors: 张建挺
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-12-17
Filing date: 2020-12-17
Publication date: 2021-07-23
Anticipated expiration: 2030-12-17

Abstract

The utility model relates to a key switch's overload insurance structure, including buckling drain pan and casing together, be equipped with the static contact and the movable contact spring of mutually supporting in the cavity that forms between drain pan and the casing, the right-hand member top of static contact is equipped with first stationary contact, the right-hand member below of movable contact spring is equipped with the movable contact corresponding with first stationary contact, and the left end below of static contact is equipped with the second stationary contact, is equipped with bimetallic strip under the static contact, and the left end top of bimetallic strip is supported and is leaned on the reset key of installing on the casing, and the middle fretwork position of bimetallic strip is equipped with the shell fragment, and the right-hand member top of shell fragment is equipped with the shell fragment contact corresponding with the second stationary contact. The utility model discloses a key switch's overload insurance structural design is reasonable, and movable contact and static contact realize opening and shutting of switch, and static contact and bimetallic strip realize overload protection, and the shell fragment and the static contact separation of bimetallic strip when the electric current transships to realize power-off protection, only need press the return key during resetting and just can realize the shell fragment return.

Description

Overload safety structure of key switch

Technical Field

The utility model relates to a key switch's overload insurance structure.

Background

At present, the key switch is widely applied to power control of electric appliances, and is particularly used on a power plugboard. The static contact of the traditional key switch is directly bent when the current is overloaded, and the contact of the bent static contact is separated from the contact of the movable contact to realize the separation of the static contact and the movable contact. This has long been a perplexing problem with such switches.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a key switch's overload insurance structure.

The utility model discloses a key switch's overload insurance structure, including buckling drain pan and casing together, be equipped with the static contact and the movable contact spring of mutually supporting in the cavity that forms between drain pan and the casing, be equipped with the ratchet assembly of fixing on casing top face directly over the movable contact spring, the top of ratchet assembly is equipped with the switch cap, the right-hand member top of static contact spring is equipped with first stationary contact, the right-hand member below of movable contact spring is equipped with the movable contact corresponding with first stationary contact, and the left end below of static contact is equipped with the second stationary contact, is equipped with the bimetallic strip under the static contact, and the left end top of bimetallic strip is supported and is leaned on the reset key of installing on the casing, and the middle fretwork position of bimetallic strip is equipped with the shell fragment, and the right-hand member top of shell fragment is equipped with the shell fragment contact corresponding with second stationary contact.

The utility model discloses a key switch's overload insurance structure, the left end of movable contact spring is buckled the after-fixing downwards on the drain pan inner wall, and the right-hand member of movable contact spring is arranged to the upper right side slope.

The utility model discloses a key switch's overload insurance structure, the right-hand member of bimetallic strip is fixed on the inner wall of drain pan, the left end department that is close to the shell fragment on the bottom inner wall of drain pan is equipped with the projection corresponding with the shell fragment.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses a key switch's overload insurance structural design is reasonable, at bimetallic strip of below design of static contact, movable contact spring and static contact realize opening and shutting of switch, and overload protection is realized with the bimetallic strip to the static contact, no longer influences bimetallic strip and static contact's being connected when frequently pressing the switch cap, and the shell fragment and the static contact separation of bimetallic strip when the electric current transships to realize power-off protection, only need press the reset key during the restoration and just can realize the shell fragment return.

Drawings

Fig. 1 is a schematic structural diagram of an overload protection structure of a key switch according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a bimetal in an overload protection structure of a push switch according to an embodiment of the present invention;

fig. 3 is a reference diagram of an overload protection structure of a key switch according to an embodiment of the present invention;

fig. 4 is a second usage state reference diagram of an overload protection structure of a key switch according to an embodiment of the present invention.

In the figure:

1. a bottom case; 2. a housing; 3. a static contact piece; 4. a movable contact spring; 5. a ratchet assembly; 6. a switch cap; 7. a first stationary contact; 8. a movable contact; 9. a second stationary contact; 10. a bimetal; 11. a reset key; 12. a spring plate; 13. a spring contact; 14. a convex column.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

As shown in fig. 1-2, an overload safety structure of a key switch comprises a bottom shell 1 and a shell 2 which are buckled together, a static contact piece 3 and a movable contact piece 4 which are mutually matched are arranged in a cavity formed between the bottom shell 1 and the shell 2, a ratchet assembly 5 fixed on the top end surface of the shell 2 is arranged right above the movable contact piece 4, a switch cap 6 is arranged at the top end of the ratchet assembly 5, a first fixed contact 7 is arranged above the right end of the fixed contact piece 3, a movable contact 8 corresponding to the first fixed contact 7 is arranged below the right end of the movable contact piece 4, a second fixed contact 9 is arranged below the left end of the fixed contact piece 3, a bimetallic strip 10 is arranged under the fixed contact piece 3, a return key 11 installed on the shell 2 is abutted to the upper portion of the left end of the bimetallic strip 10, an elastic piece 12 is arranged at the middle hollow part of the bimetallic strip 10, and an elastic piece contact 13 corresponding to the second fixed contact 9 is arranged above the right end of the elastic piece 12.

The utility model discloses a key switch's overload insurance structure, the left end of movable contact spring 4 is buckled the after-fixing downwards on drain pan 1 inner wall, and the right-hand member of movable contact spring 4 is arranged to the upper right side slope.

The utility model discloses a key switch's overload insurance structure, bimetallic strip 10's right-hand member is fixed on the inner wall of drain pan 1, the left end department that is close to shell fragment 12 on the bottom inner wall of drain pan 1 is equipped with the projection 14 corresponding with shell fragment 12.

The utility model discloses a key switch's overload insurance structure is at concrete during operation, and the setting is strong on ratchet assembly's next door to the return, and its lower extreme passes behind the casing and corresponds with bimetallic strip left end. When the switch cap is pressed (as shown in fig. 3), the movable contact and the static contact are closed, the circuit is conducted, and when the current is overloaded, the elastic sheet of the bimetallic strip jumps down, and the circuit of the bimetallic strip and the static contact is disconnected, so that the protection is realized. When the reset key is pressed (as shown in fig. 4), the elastic sheet jumps up, the bimetallic strip is communicated with the circuit of the static contact, and the work is recovered.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a key switch's overload insurance structure, is equipped with static contact (3) and movable contact (4) of mutually supporting including the lock drain pan (1) and casing (2) that are in the same place, in the cavity that forms between drain pan (1) and casing (2), is equipped with ratchet assembly (5) of fixing on casing (2) top face directly over movable contact (4), and the top of ratchet assembly (5) is equipped with switch cap (6), its characterized in that: the spring-loaded type automatic spring-loaded mechanism is characterized in that a first fixed contact (7) is arranged above the right end of the fixed contact piece (3), a movable contact (8) corresponding to the first fixed contact (7) is arranged below the right end of the movable contact piece (4), a second fixed contact (9) is arranged below the left end of the fixed contact piece (3), a bimetallic strip (10) is arranged under the fixed contact piece (3), a reset key (11) installed on the shell (2) is abutted to the upper portion of the left end of the bimetallic strip (10), an elastic sheet (12) is arranged at a hollow-out position in the middle of the bimetallic strip (10), and an elastic sheet contact (13) corresponding to the second fixed contact (9) is arranged above the right end of the elastic sheet (12).

2. The overload safety structure of the key switch according to claim 1, wherein: the left end of the movable contact piece (4) is bent downwards and then fixed on the inner wall of the bottom shell (1), and the right end of the movable contact piece (4) is obliquely arranged towards the upper right.

3. The overload safety structure of the key switch according to claim 1, wherein: the right end of the bimetallic strip (10) is fixed on the inner wall of the bottom shell (1), and a convex column (14) corresponding to the elastic sheet (12) is arranged at the left end of the inner wall of the bottom end of the bottom shell (1) close to the elastic sheet (12).