A protector

Abstract

The invention discloses a protector, comprising a base, an upper cover and a moving spring piece. The base is provided with a connected heating wire and a static contact. A first bimetallic sheet is provided above the heating wire. One end of the moving spring piece is fixed to the upper cover so that the moving contact of the moving spring piece is opposite to the static contact. A top column is provided in the middle of the moving spring piece. When heated, the first bimetallic sheet pushes against the top column to push the moving spring piece away. A supporting column is provided on the upper cover. A rocker arm that can rotate around the support column is sleeved on the supporting column. A conductive connecting block is provided on the end of the rocker arm. The side of the rocker arm is also connected to a spring that enables the rocker arm to rotate around the supporting column. A clamping protrusion is provided on the arc edge of the rocker arm sleeved on the supporting column. A second bimetallic sheet is vertically provided near the heating wire on the base, which clamps the clamping protrusion and presses the conductive connecting block between the moving contact and the static contact to deform the spring. When the second bimetallic sheet is heated, the clamping protrusion is released, and the spring is deformed and restored to rotate around the support column to move the conductive connecting block away, thereby effectively disconnecting the circuit and eliminating the hidden danger of short circuit caused by contact between the moving spring piece and the static contact.

Description

Technical Field

[0001] The invention relates to a circuit protection device, in particular to a compressor protector. Background Art

[0002] Compressor protectors are essential for maintaining normal operating voltages in industrial equipment. Connecting an overload protector in series with the compressor circuit will cause the overload protector to trip when the circuit current is too high or the compressor temperature is too high, disconnecting the power circuit and protecting the compressor and other electrical equipment.

[0003] Existing compressor protector structures all feature a heating wire installed within the protector housing. The heating wire is connected in series to the circuit loop, and a bimetallic strip is installed above the heating wire. A movable spring assembly is also installed above the bimetallic strip, and the movable contact of the movable spring assembly maintains contact with the static contact of the circuit loop. When the operating current of the circuit is too high or the compressor temperature is too high, the bimetallic strip within the overload protector will deform due to thermal deformation. The deformed bimetallic strip will push the movable spring assembly, separating the movable contact on it from the static contact of the circuit, thereby disconnecting the energized circuit. This structure allows the bimetallic strip to be freely placed on the heating wire, making it impossible to maintain a fixed distance between the bimetallic strip and the heating wire. When the distance between the bimetallic strip and the heating wire is too small, the heating wire may be subjected to a high current shock, and the bimetallic strip may bounce and touch the movable spring assembly. In severe cases, the bimetallic strip may contact and adhere to the movable spring assembly, forming a circuit, causing the protector to fail. Furthermore, when the distance between the bimetallic strip and the heating wire is too large, the bimetallic strip cannot sense the thermal changes of the heating wire and deform, making it impossible to disconnect the circuit in time, posing a significant safety hazard. Summary of the Invention

[0004] The present invention provides a protector which has a simple structure and can effectively disconnect a circuit.

[0005] The protector of the present invention comprises a base, an upper cover and a movable spring, wherein the base is provided with a connected heating wire and a static contact, a first bimetallic strip is provided above the heating wire, one end of the movable spring strip is fixed to the upper cover, the movable contact of the movable spring strip is opposite to the static contact, a top column is provided in the middle of the movable spring strip, and the first bimetallic strip is heated and pushes the movable spring strip against the top column to push the movable spring strip open, the upper cover is provided with a support column, a rocker arm that can rotate around it is sleeved on the support column, a conductive connecting block is provided at the end of the rocker arm, the side of the rocker arm is also connected to a spring that is deformed to enable the rocker arm to rotate around the support column, a locking protrusion is provided on the arc edge of the rocker arm sleeved on the support column, and the base is also vertically provided with a second bimetallic strip near the heating wire, which is clamped and presses the conductive connecting block against between the moving contact and the static contact to deform the spring, and the second bimetallic strip releases the locking protrusion when heated, and the spring deformation is restored to cause the rocker arm to rotate around the support column to remove the conductive connecting block, thereby disconnecting the circuit.

[0006] The protector is described, one end of the moving spring is fixedly mounted on the upper cover, the heating wire and the first bimetallic strip are mounted on the base, after the upper cover is closed on the base, the moving contact of the moving spring and the static contact can be arranged opposite to each other, so that the top column is located above the first bimetallic strip, which is convenient for assembly; the top column arranged in the middle of the moving spring abuts and pushes the first bimetallic strip after the action, so that a certain distance is left between the moving contact and the static contact of the moving spring, which facilitates the pushing out of the conductive connection block from between the moving contact and the static contact, and at the same time, after the top column abuts against the first metal strip, The invention can maintain a certain distance between the moving contact and the static contact to prevent the moving contact and the static contact from contacting each other; the rocker arm drives the spring to deform, and the side of the second bimetallic strip can clamp the locking protrusion of the rocker arm, so that the conductive connection block is placed between the moving contact and the static contact to maintain electrical connection. When the second bimetallic strip is bent by heat and the locking protrusion is released, the rocker arm rotates around the support column under the force of the spring deformation recovery, and the conductive connection block is removed from between the moving contact and the static contact, effectively disconnecting the connection between the moving contact and the static contact, and effectively solving the problem of circuit short circuit. The present invention has a simple structure. The second bimetallic strip is deformed to cause the rocker arm to rotate, remove the conductive connection block placed between the moving contact and the static contact, disconnect the circuit, and avoid the hidden danger of short circuit between the moving spring and the static contact due to excessive deformation of the first bimetallic strip due to excessive heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is a schematic diagram of an explosion of a protector structure.

[0008] Figure 2 This is a cross-sectional view of a protector structure.

[0009] Figure 3 A schematic diagram of a protector structure.

[0010] Figure 4 for Figure 3 A partial enlarged view. DETAILED DESCRIPTION

[0011] like Figure 1-4As shown, a protector includes a base 1, an upper cover 2 and a moving spring 3. The base is provided with a connected heating wire 4 and a static contact 5. A first bimetallic strip 15 is provided above the heating wire. One end of the moving spring is fixed to the upper cover. The moving contact 302 of the moving spring is opposite to the static contact 5. A top column 301 is provided in the middle of the moving spring. The first bimetallic strip is heated and pushes the moving spring away against the top column. The upper cover is provided with a support column 6, and a rocker that can rotate around it is sleeved on the support column. Arm 7, a conductive connecting block 8 is provided at the end of the rocker arm, and a spring 9 is also connected to the side of the rocker arm, which is deformed to make the rocker arm rotate around the support column. A locking protrusion 801 is provided on the arc edge of the rocker arm sleeved on the support column. The base is also vertically provided with a second bimetallic strip 10 near the heating wire to clamp the locking protrusion and press the conductive connecting block between the moving contact and the static contact to deform the spring. The second bimetallic strip releases the locking protrusion when heated, and the spring deformation is restored to make the rocker arm rotate around the support column to remove the conductive connecting block, thereby disconnecting the circuit.

[0012] The protector is described, one end of the moving spring is fixedly mounted on the upper cover, the heating wire and the first bimetallic strip are mounted on the base, after the upper cover is closed on the base, the moving contact of the moving spring and the static contact can be arranged opposite to each other, so that the top column is located above the first bimetallic strip, which is convenient for assembly; the top column arranged in the middle of the moving spring abuts and pushes the first bimetallic strip after the action, so that a certain distance is left between the moving contact and the static contact of the moving spring, which facilitates the pushing out of the conductive connection block from between the moving contact and the static contact, and at the same time, after the top column abuts against the first metal strip, The invention can maintain a certain distance between the moving contact and the static contact to prevent the moving contact and the static contact from contacting each other; the rocker arm drives the spring to deform, and the side of the second bimetallic strip can clamp the locking protrusion of the rocker arm, so that the conductive connection block is placed between the moving contact and the static contact to maintain electrical connection. When the second bimetallic strip is bent by heat and the locking protrusion is released, the rocker arm rotates around the support column under the force of the spring deformation recovery, and the conductive connection block is removed from between the moving contact and the static contact, effectively disconnecting the connection between the moving contact and the static contact, and effectively solving the problem of circuit short circuit. The present invention has a simple structure. The second bimetallic strip is deformed to cause the rocker arm to rotate, remove the conductive connection block placed between the moving contact and the static contact, disconnect the circuit, and avoid the hidden danger of short circuit between the moving spring and the static contact due to excessive deformation of the first bimetallic strip due to excessive heat.

[0013] The second bimetallic strip is separately arranged on the side of the base near the heating wire and is not connected to the loop, which can further ensure that the second bimetallic strip can completely disconnect the circuit after being triggered, and the second bimetallic strip is a one-time action, that is, after the heating wire stops heating, even if the second bimetallic strip recovers its deformation, it will not push the rocker arm, so that the conductive connecting block is re-positioned between the moving contact and the static contact to make the circuit conductive, preventing the circuit from being re-conducted without inspection after the temperature of the protector drops, thereby improving safety.

[0014] The spring is a torsion spring, sleeved and fixed to the base. One end of the torsion spring is horizontally mounted and clamped to the base, while the other end is vertically mounted and fixed to the center of the rocker arm. When the conductive connection block is placed between the moving contact and the stationary contact, the rocker arm causes the torsion spring to deform. Compared to compression or tension springs, the torsion spring is smaller and maintains its elastic force for a longer period, making it suitable for installation in the limited space of the protector. When the second bimetallic strip is heated and actuated, the protrusion that holds the rocker arm loosens, allowing the torsion spring to quickly deform and return, driving the rocker arm to remove the conductive connection block from between the moving contact and the stationary contact, thus disconnecting the circuit.

[0015] The ends of the moving and stationary contacts are both provided with arc-shaped bosses. The edges of the bosses have a circular transition zone, which facilitates pushing the conductive connection block between the moving and stationary contacts. When the second bimetallic strip is heated and actuated, the rocker arm can also easily move the conductive connection block away, preventing the end of the conductive connection block from adhering to the moving or stationary contacts, effectively disconnecting the circuit.

[0016] The base is provided with a mounting groove 11 for placing the second bimetallic strip, and a clamping groove 12 is provided inside the mounting groove. One end of the second bimetallic strip is provided with a positioning pin 101 that can be inserted into the clamping groove and fixed. The positioning pin provided at one end of the second bimetallic strip can facilitate the quick insertion of the second bimetallic strip into the mounting groove for positioning, thereby shortening the installation time.

[0017] A rib 13 is provided in the mounting groove relative to the middle of the second bimetallic strip. When the second bimetallic strip is heated and actuated, the rib abuts against the middle of the second bimetallic strip, preventing the second bimetallic strip from being deformed excessively and causing the ends of the second bimetallic strip to swing. This further ensures that the second bimetallic strip effectively releases the protrusion that is holding the rocker arm, allowing the rocker arm to actuate in time to disconnect the circuit.

[0018] One end of the movable spring can be inserted into the upper cover, or a fixed portion can be provided on one end of the movable spring, bent parallel to the movable spring, and fixed within the upper cover. The bent fixed portion of the movable spring is fixed to the upper cover via rivets, which facilitates installation and ensures that the movable spring has sufficient deformation to increase the contact pressure between the movable contact and the static contact, ensuring good contact.

Claims

1. A protector, comprising a base (1), an upper cover (2) and a movable spring (3), wherein the base is provided with a connected heating wire (4) and a static contact (5), and a first bimetallic strip (15) is provided above the heating wire, characterized in that: One end of the movable spring is fixed to the upper cover, the movable contact (302) of the movable spring is opposite to the static contact (5), a top column (301) is arranged in the middle of the movable spring, the first bimetallic strip is heated to push the movable spring away from the top column, the upper cover is provided with a support column (6), a rocker arm (7) is sleeved on the support column and can rotate around it, a conductive connection block (8) is arranged at the end of the rocker arm, and a spring (9) is connected to the side of the rocker arm and deforms to make the rocker arm rotate around the support column, a locking protrusion (801) is arranged on the arc edge of the rocker arm sleeved on the support column, and a second bimetallic strip (10) is vertically arranged near the heating wire to lock the locking protrusion and press the conductive connection block between the movable contact and the static contact to deform the spring, the second bimetallic strip is heated to release the locking protrusion, the spring is deformed and restored to make the rocker arm rotate around the support column to remove the conductive connection block, thereby disconnecting the circuit.

2. The protector according to claim 1, characterized in that: The spring is a torsion spring, which is sleeved and fixed on the base. One end of the torsion spring is horizontally arranged and clamped on the base, and the other end of the torsion spring is vertically arranged and fixed in the middle of the rocker arm. When the conductive connecting block is placed between the moving contact and the static contact, the rocker arm drives the torsion spring to deform.

3. The protector according to claim 1, characterized in that: The ends of the moving contact and the stationary contact are both provided with arc bosses.

4. The protector according to claim 1, characterized in that: The base is provided with a mounting groove (11) for placing the second bimetallic strip, a clamping groove (12) is provided inside the mounting groove, and one end of the second bimetallic strip is provided with a positioning pin (101) that can be inserted into the clamping groove for fixing.

5. The protector according to claim 4, characterized in that: A convex rib (13) is provided at a position of the mounting groove relative to the middle of the second bimetallic strip.

6. The protector according to claim 1, characterized in that: One end of the movable spring sheet is provided with a fixing portion which is bent and parallel to the movable spring sheet, and the fixing portion is fixed in the upper cover.

Images