Overload protector used to control the operation and interruption of motor equipment.

Abstract

This invention relates to an overload protector for controlling the operation and interruption of motor equipment. It includes a body, a first conductive element, a second conductive element, and a shape memory alloy sheet. Parts of the first and second conductive elements are located within the body, while the remaining portions protrude from the body and are electrically connected to a power supply and a motor equipment, respectively. The shape memory alloy sheet is located within the body and, when it is below 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 flips into a second bent shape and detaches from the second conductive element. When the temperature of the shape memory alloy sheet returns to below the predetermined overload temperature, it flips back from the second bent shape to the first bent shape. Thus, by utilizing the overall shape-flipping characteristic of the shape memory alloy sheet under different temperature conditions, the functions of overload circuit breaking and automatic reset can be achieved.

Claims

1. An overload protector for controlling the operation and interruption of motor equipment, comprising: The main body is made of insulating material and has an internal storage space; A first conductive element is disposed on the body, comprising a first contact portion and a first connecting portion, wherein the first contact portion is located in the receiving space, and the first connecting portion is used for electrically connecting to a power supply terminal; a second conductive element is disposed on the body, comprising a second contact portion and a second connecting portion, wherein the second contact portion is located in the receiving space, and the second connecting portion is used for electrically connecting to a power terminal of a motor device, so that the overload protector is disposed between the power supply terminal and the motor device; and a shape memory alloy sheet is disposed in the receiving space and is a single sheet, one end of which contacts the first contact portion, and the other end corresponds to the second contact portion; When the shape memory alloy sheet is below a predetermined overload temperature, it is in a first bent shape, with its other end in contact with the second contact portion, so that the first conductive element and the second conductive element are in a conductive state; when the shape memory alloy sheet exceeds the predetermined overload temperature, it is flipped into a second bent shape, with its other end detached from the second contact portion, so that the first conductive element and the second conductive element are in an open circuit state.

2. The overload protector as described in claim 1, wherein, One end of the shape memory alloy sheet extends along its length to form a reference line. In a first bending state, the other end of the shape memory alloy sheet is located on one side of the reference line. In a second bending state, the other end of the shape memory alloy sheet is located on the other side of the reference line.

3. The overload protector as described in claim 1, wherein, The second contact portion is provided with a conductive contact, and the other end of the shape memory alloy sheet is provided with a movable contact. When the shape memory alloy sheet is in a first bent state, the movable contact is against the conductive contact; when the shape memory alloy sheet is in a second bent state, the movable contact is disengaged from the conductive contact.

4. The overload protector as described in claim 1, wherein, The first bending shape and the second bending shape have opposite bending directions, respectively.

5. An overload protector as described in any one of claims 1 to 4, wherein, The first curved shape is a downward arc, and the second curved shape is an upward arc.

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