Overload protector

Abstract

This invention relates to an overload protector, comprising a body, a first conductive element, a second conductive element, a shape memory alloy sheet, a reset plate, and a button. The tops of the first and second conductive elements are located within the body, while their bottoms protrude outside the body. The shape memory alloy sheet is located within the body and, when not reaching a predetermined overload temperature, is in a first bent shape, with its two ends contacting the first and second conductive elements respectively. When the predetermined overload temperature is exceeded, the shape memory alloy sheet reverses its overall shape to a second bent shape and detaches from the second conductive element. The button is movably disposed within the body; when pressed, it applies force to the reset plate, causing the reset plate to apply force to the shape memory alloy sheet, causing the shape memory alloy sheet to reverse from the second bent shape back to the first bent shape.

Claims

1. An overload protector, comprising: The main body is made of insulating material, and has a through hole on its top side, which contains a receiving space. A first conductive element is disposed on the body, with its top located in the receiving space and its bottom protruding from the body; a second conductive element is disposed on the body, with its top located in the receiving space and its bottom protruding from the body; a shape memory alloy sheet is disposed in the receiving space and is a single sheet, wherein the shape memory alloy sheet is in a first bent shape when it is below a predetermined overload temperature, with one end in contact with the top of the first conductive element and the other end in contact with the top of the second conductive element; when the shape memory alloy sheet exceeds the predetermined overload temperature, it is reversed in shape and flipped into a second bent shape, so that its other end is detached from the top of the second conductive element. A reset piece is disposed in the receiving space and fixed to the body, with one free end corresponding to the shape memory alloy sheet. When the reset piece is subjected to an external force, the free end can apply force to the shape memory alloy sheet and return to a non-forced position when the external force is released. A button is movably disposed in the through hole of the body. When pressed, it can directly or indirectly act on the reset piece to apply force to the shape memory alloy sheet, causing the shape memory alloy sheet to flip from the second bending shape to the first bending shape.

2. The overload protector as described in claim 1, wherein, The second conductive element has a conductive contact at its top, and the shape memory alloy sheet has a movable contact at its other end. Under normal conditions, the movable contact of the shape memory alloy sheet directly abuts against the conductive contact.

3. The overload protector as described in claim 1, wherein, The reset plate system is configured to apply a restoring force to the button when the external force is released, so that the button returns to a non-pressed position.

4. The overload protector as described in claim 1 further includes a lower stop member disposed in the receiving space and located below the shape memory alloy sheet, wherein, The lower stop is configured to abut against the middle section of the shape memory alloy sheet when the shape memory alloy sheet is in the second bent shape and is subjected to force by the reset sheet, so as to assist the shape memory alloy sheet to return to the first bent shape.

5. The overload protector as described in claim 1 further includes an upper stop member disposed in the receiving space and positioned above the shape memory alloy sheet, wherein, The upper stop is configured to abut against the middle section of the shape memory alloy sheet when the sheet is in the first bending state and exceeds the predetermined overload temperature, so as to assist the sheet in flipping to the second bending state.

6. The overload protector as described in claim 5, wherein, The upper stop is integrally formed on the reset plate.

7. The overload protector as described in claim 1, wherein, The bottom end of the button abuts against the reset plate, and the button is provided with at least one protrusion. Each protrusion extends beyond the projection area of ​​the through hole in the displacement direction of the button, so that the button is positioned in the body by the restriction of each protrusion and the reset plate in the displacement direction.

8. An overload protector as described in any one of claims 1 to 7, wherein, The body comprises: a first shell having a first space; a second shell having a second space, wherein the second shell and the first shell are joined together to form the receiving space; and a tubular member having the through hole and being clamped and fixed between the first shell and the second shell.

9. The overload protector as described in claim 8, wherein, The outer edge of the tubular component is provided with at least one positioning part, and the first shell and / or the second shell are provided with at least one positioning groove, with each positioning part respectively accommodated in the corresponding positioning groove.

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