CN213988732U - Automatic protection switch of low-voltage apparatus - Google Patents
Automatic protection switch of low-voltage apparatus Download PDFInfo
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- CN213988732U CN213988732U CN202120192639.XU CN202120192639U CN213988732U CN 213988732 U CN213988732 U CN 213988732U CN 202120192639 U CN202120192639 U CN 202120192639U CN 213988732 U CN213988732 U CN 213988732U
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- shell
- block
- pressing plate
- movable
- bimetallic strip
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Abstract
An automatic protection switch of a low-voltage apparatus relates to the field of electricity, comprising a shell, wherein a movable contact piece, a static contact piece and a bimetallic strip are arranged in the shell, an insulating plate is connected in the shell, the bimetallic strip is connected with the bottom of the shell, and the upper surface of the bimetallic strip is connected with a stop block; the upper surface of the insulating plate is provided with a chute, a long hole is formed in the chute, a moving block is arranged in the chute, the lower surface of the moving block is connected with a locking block, and the locking block is arranged on one side of the stop block after extending out of the long hole; the static contact is connected to the insulating plate, a first spring is arranged between the static contact and the moving block, and the moving contact is connected to the moving block; a push rod moving hole is formed in the upper end of the shell, and the moving block is connected with the push plate through the push rod; the upper end of the shell is also provided with a pressing plate movable hole, the pressing plate is hinged at the pressing plate movable hole, the lower end of the pressing plate is detachably arranged on the movable contact piece, and the lower end of the pressing plate is connected with the shell through a second spring. The utility model discloses the contact is stable, and the part is few, and is small, with low costs.
Description
Technical Field
The utility model relates to a field of electricity especially relates to protection switch's structure.
Background
Any electrical appliance through which a large current passes is generally provided with a protection switch, the overload protection switch generally adopts a bimetallic strip as a switch element, the switch generally further comprises a static contact strip for fixedly connecting a first terminal of the overload protection switch and a movable contact strip for connecting/disconnecting a second terminal of the overload protection switch, the bimetallic strip drives the movable contact strip to be in contact with the static contact strip for conduction when the overload protection switch is in a closed state, and when the overload current occurs, the bimetallic strip is heated, bent and deformed, and the movable contact strip is separated from the static contact strip so as to disconnect the overload protection switch. The existing switch has the defects of contact pressure difference, unstable contact, complex structure, more parts, large volume and high cost.
Disclosure of Invention
The utility model aims at overcoming the defects of the prior art and providing an automatic protection switch of a low-voltage electrical appliance with stable contact, small volume and low cost.
The purpose of the utility model is realized like this: an automatic protection switch of a low-voltage apparatus comprises a shell, wherein a movable contact piece, a static contact piece and a bimetallic strip are arranged in the shell, an insulating plate is connected in the shell, and the shell is divided into an upper cavity and a lower cavity by the insulating plate; the bimetallic strip is arranged in the lower cavity and connected with the bottom of the shell, and the upper surface of the bimetallic strip is connected with the stop block; the upper surface of the insulating plate is provided with a sliding groove, a long hole is formed in the sliding groove, a moving block is arranged in the sliding groove, the lower surface of the moving block is connected with a locking block, the locking block is arranged on one side of the stop block after extending out of the long hole, the locking block is in a right-angled triangle shape, one right-angled side of the locking block is connected with the moving block, and the other right-angled side of the locking block is in contact with the stop block; the movable contact piece is connected with the movable block, and the movable contact piece is detachably connected with the static contact piece; a push rod moving hole is formed in the upper end of the shell, the moving block is connected with a push plate through a push rod, the push rod extends out of the push rod moving hole, and the push plate is arranged on the upper surface of the shell; the upper end of the shell is also provided with a pressing plate movable hole, the pressing plate is hinged to the pressing plate movable hole, the upper end of the pressing plate extends out of the shell, the lower end of the pressing plate is detachably arranged on the movable contact piece, and the lower end of the pressing plate is connected with the shell through a second spring.
The principle of the utility model is as follows: when the device is normally used, the stop block blocks the locking block, the movable contact piece is contacted with the static contact piece and is pressed by the lower end of the pressing plate, the stop block at the lower part and the locking block are locked mutually, and the push plate at the upper part and the upper end of the pressing plate are locked mutually. When overcurrent occurs, the bimetallic strip is heated, bent and deformed downwards, the stop block is driven to move downwards and leave the locking block, the movable block drives the movable contact strip to leave the static contact strip under the action of the first spring, the push plate is driven by the movable block to leave the upper end of the pressing plate, the lower end of the pressing plate leaves the movable contact strip under the action of the second spring, and therefore the movable contact strip is guaranteed to smoothly leave the static contact strip. When the bimetallic strip recovers and needs to be reset, the push plate is manually pushed, the inclined surface of the locking block slides over the stop block, the locking block is fixed by the stop block, the movable contact piece moves to the position above the static contact piece, meanwhile, the push plate moves to the position between the upper end of the press plate and the shell, the push plate pushes the press plate, and the lower end of the press plate is abutted to the movable contact piece. The utility model discloses the contact is stable, and the part is few, and is small, with low costs.
In order to adjust the position of the bimetallic strip conveniently, the bottom of the shell is provided with a threaded seat, a screw rod is connected in the threaded seat, the screw rod is vertically arranged, the diameter of the upper end of the screw rod is reduced to form a step, one end of the bimetallic strip is sleeved on the step of the screw rod, and the upper end of the screw rod is connected with a nut.
In order to conveniently install each part, the shell comprises a lower shell and an upper shell, and the bimetallic strip, the threaded seat and the screw rod are all arranged in the lower shell.
The utility model discloses a clamp plate is the V-arrangement, sets up the installation ear at the integrative of the portion of bending of clamp plate, and the installation ear passes through the hinge with last casing and is connected.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural view of an insulating plate and a moving block.
Fig. 3 is an enlarged view of a portion a in fig. 1.
Detailed Description
As shown in fig. 1-3, the automatic protection switch for low-voltage electrical apparatus comprises a housing 1, which comprises a lower housing 102 and an upper housing 101, wherein the upper housing 101 is clamped on the lower housing 102.
The bimetallic strip 13, the threaded seat 19 and the screw 18 are arranged in the lower shell 102, the threaded seat 19 is connected to the bottom of the lower shell 102, the screw 18 is vertically arranged, the screw 18 is connected into the threaded seat 19, the diameter of the upper end of the screw 18 is reduced to form a step 181, one end of the bimetallic strip 13 is sleeved on the step 181 of the screw 18, the upper end of the screw 18 is connected with the nut 17, and the stop block 14 is connected to the upper surface of the bimetallic strip 13.
The insulation board 10 is connected in the upper shell 101, the sliding groove 16 is formed in the upper surface of the insulation board 10, the long hole 15 is formed in the sliding groove 16, the moving block 11 is arranged in the sliding groove 16, the lower surface of the moving block 11 is connected with the locking block 12, the locking block 12 is arranged on one side of the stop block 14 after extending out of the long hole 15, the locking block 12 is in a right triangle shape, a right-angle side of the locking block 12 is connected with the moving block 11, the other right-angle side is in contact with the stop block 14, and the locking block 12 is blocked by the stop block 14. The insulating plate 10 is connected with a static contact 8, and a first spring 9 is arranged between the static contact 8 and a moving block 11. The moving block 11 is connected with a moving contact piece 7, and the moving contact piece 7 is connected with a static contact piece 8 in a separable way.
A push rod moving hole 2 is formed at the upper end of the upper case 101, a push plate 3 is connected to the moving block 11 through a push rod 20, the push rod 20 protrudes from the push rod moving hole 2, and the push plate 3 is disposed on the upper surface of the upper case 101. The upper end of the upper shell 101 is further provided with a press plate movable hole 21, a press plate 4 is arranged at the press plate movable hole 21, the press plate 4 is V-shaped, a bending part of the press plate 4 is integrally provided with an installation lug 22, and the installation lug 22 is connected with the upper shell 101 through a hinge shaft 5. The upper end of the pressure plate 4 extends out of the upper shell 101, the lower end of the pressure plate 4 is detachably arranged on the movable contact piece 7, and the lower end of the pressure plate 4 is connected with the upper shell 101 through the second spring 6.
In normal use, the stop 14 blocks the locking block 12, and the movable contact piece 7 is contacted with the static contact piece 8 and is pressed by the lower end of the pressure plate 4. When overcurrent occurs, the bimetallic strip 13 is heated, bent and deformed downwards, the stop block 14 is driven to move downwards to leave the locking block 12, the moving block 11 drives the moving contact piece 7 to move leftwards to leave the static contact piece 8 under the action of the first spring 9, meanwhile, the moving block 11 drives the push plate 3 to leave the upper end of the pressing plate 4, the lower end of the pressing plate 4 leaves the moving contact piece 7 under the action of the second spring 6. When the bimetallic strip is restored and needs to be reset, the push plate 3 is manually pushed, the inclined surface of the locking block 12 slides over the stop block 14, the locking block 12 is fixed by the stop block 14, the movable contact piece 7 moves above the static contact piece 8, meanwhile, the push plate 3 moves rightwards to a position between the upper end of the press plate 4 and the upper shell 101, the push plate 3 pushes the press plate 4, and the lower end of the press plate 4 is abutted to the movable contact piece 7. The product has compact structure layout, sensitive control and convenient reset.
The present invention is not limited by the above embodiments, and those skilled in the art should understand that the description in the above embodiments and the description is only the preferred embodiments of the present invention, and not intended to limit the present invention, and that the present invention will have various changes and improvements without departing from the spirit and scope of the present invention, and these changes and improvements all fall into the scope of the present invention.
Claims (4)
1. The utility model provides an automatic protection switch of low-voltage apparatus, includes the casing, sets up movable contact, static contact and bimetallic strip in the casing, characterized by: the shell is connected with an insulating plate which divides the shell into an upper cavity and a lower cavity; the bimetallic strip is arranged in the lower cavity and connected with the bottom of the shell, and the upper surface of the bimetallic strip is connected with the stop block; the upper surface of the insulating plate is provided with a sliding groove, a long hole is formed in the sliding groove, a moving block is arranged in the sliding groove, the lower surface of the moving block is connected with a locking block, the locking block is arranged on one side of the stop block after extending out of the long hole, the locking block is in a right-angled triangle shape, one right-angled side of the locking block is connected with the moving block, and the other right-angled side of the locking block is in contact with the stop block; the movable contact piece is connected with the movable block, and the movable contact piece is detachably connected with the static contact piece; a push rod moving hole is formed in the upper end of the shell, the moving block is connected with a push plate through a push rod, the push rod extends out of the push rod moving hole, and the push plate is arranged on the upper surface of the shell; the upper end of the shell is also provided with a pressing plate movable hole, the pressing plate is hinged to the pressing plate movable hole, the upper end of the pressing plate extends out of the shell, the lower end of the pressing plate is detachably arranged on the movable contact piece, and the lower end of the pressing plate is connected with the shell through a second spring.
2. The automatic protection switch for low-voltage electric appliances of claim 1, characterized in that: the bottom of the shell is provided with a threaded seat, a screw rod is connected in the threaded seat, the screw rod is vertically arranged, the diameter of the upper end of the screw rod is reduced to form a step, one end of the bimetallic strip is sleeved on the step of the screw rod, and the upper end of the screw rod is connected with a nut.
3. The automatic protection switch for low-voltage electric appliances of claim 2, characterized in that: the casing includes lower casing and upper housing, bimetallic strip, screw thread seat, screw rod all set up in the lower casing, movable block, static contact, first spring and second spring all set up in the upper housing.
4. The automatic protection switch of low-voltage apparatus according to claim 3, characterized in that: the pressing plate is V-shaped, the bending part of the pressing plate is integrally provided with an installation lug, and the installation lug is connected with the upper shell through a hinge shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120192639.XU CN213988732U (en) | 2021-01-25 | 2021-01-25 | Automatic protection switch of low-voltage apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120192639.XU CN213988732U (en) | 2021-01-25 | 2021-01-25 | Automatic protection switch of low-voltage apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213988732U true CN213988732U (en) | 2021-08-17 |
Family
ID=77252646
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120192639.XU Active CN213988732U (en) | 2021-01-25 | 2021-01-25 | Automatic protection switch of low-voltage apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213988732U (en) |
-
2021
- 2021-01-25 CN CN202120192639.XU patent/CN213988732U/en active Active
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| GR01 | Patent grant |