Overload protector
By designing an overload protection unit and a control unit in the overload protector, and utilizing low-melting-point conductive materials and a heat-conducting plate structure, dual protection for the controlled circuit and the main control circuit is achieved. This solves the problem that existing technologies can only protect the controlled circuit, and improves the overload protection effect and safety.
Patent Information
- Application Number
- CN202423019899.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-06
- Publication Date
- 2025-11-14
- Estimated Expiration
- 2034-12-06
AI Technical Summary
Existing overload protectors can only protect the high-voltage circuit of the controlled circuit and cannot cut off the low-voltage circuit of the main control circuit, resulting in poor overload protection effect and insufficient safety.
Design an overload protector comprising an overload protection unit and a control unit. The overload protection unit is connected in series in the controlled circuit, and the control unit is connected in series in the main control circuit. When the overload protection unit is in an overload state, it can cut off the circuit of the controlled circuit and release the trigger state of the control unit to cut off the circuit of the main control circuit. A low melting point conductive material and a heat-conducting plate structure are used to achieve dual protection.
It achieves dual protection for both the controlled circuit and the main control circuit, improves overload protection effectiveness and safety, and ensures reliable disconnection of both circuits under overload conditions.
Smart Images
Figure CN223553030U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of circuit protection devices, and more specifically, to an overload protector. Background Technology
[0002] Overload protectors are devices used to protect circuits from overload. Currently, when overload protectors are applied to circuits, they can only protect the controlled circuit (high-voltage circuit) from overload. That is, when the controlled circuit (high-voltage circuit) is overloaded, the existing overload protectors can cut off the circuit, but they cannot cut off the circuit of the main control circuit (low-voltage circuit). As a result, the main control circuit (low-voltage circuit) will still be energized and working. Therefore, they have the disadvantages of single function and poor overload protection effect. Utility Model Content
[0003] The technical problem to be solved by this utility model is to provide an overload protector that can simultaneously cut off the circuit of the controlled circuit and the circuit of the main control circuit, thereby improving the overload protection effect of the overload protector and having higher safety.
[0004] This utility model provides an overload protector, including a base, a cover, an overload protection unit, and a control unit. Both the overload protection unit and the control unit are connected to the base. The cover covers the overload protection unit and the control unit and is connected to the base. The overload protection unit is connected in series in the controlled circuit loop, and the control unit is connected in series in the main control circuit loop. The control unit is in a state triggered by the overload protection unit. When the overload protection unit is in an overload state, it disconnects the controlled circuit loop and releases the triggering state of the control unit so that the control unit disconnects the main control circuit loop.
[0005] By adopting the above structure, when the overload protection unit is in an overload state, the overload protection unit can cut off the circuit of the controlled circuit, and the overload protection unit can release the trigger state of the control unit so that the control unit can cut off the circuit of the main control circuit. That is, the overload protector can cut off the circuit of the controlled circuit and the circuit of the main control circuit at the same time, thereby improving the overload protection effect of the overload protector and having higher safety.
[0006] In one possible implementation, the overload protection unit includes a first conductive sheet, a second conductive sheet, and a heat-conducting plate made of insulating material. The first conductive sheet, the second conductive sheet, and the heat-conducting plate are all connected to a base. The lower end of the first conductive sheet extends out of the base and forms a first terminal. The lower end of the second conductive sheet extends out of the base and forms a second terminal. The upper end of the first conductive sheet is embedded in the heat-conducting plate, and the upper end of the first conductive sheet has a conductive end embedded in the heat-conducting plate from back to front, with the front end of the conductive end located at the front face of the heat-conducting plate. The upper end of the second conductive sheet is welded and fixed to the conductive end by a low-melting-point conductive material. The upper end of the second conductive sheet has elastic potential energy to rebound away from the heat-conducting plate and detach from the conductive end. The first and second conductive sheets are connected in series in the loop of the controlled circuit via the first and second terminals. By employing this overload protection unit, when the current flowing through the first and second conductive sheets exceeds the rated current, the first conductive sheet can generate heat, and the heat generated by the first conductive sheet can be transferred to the conductive end via the heat-conducting plate. At the solder joint on the upper end of the second conductive sheet, since the upper end of the second conductive sheet is fixed to the conductive end by welding with a low-melting-point conductive material, the upper end of the second conductive sheet can be desoldered from the conductive end. Furthermore, because the upper end of the second conductive sheet has elastic potential energy to rebound away from the heat-conducting plate and detach from the conductive end, after the upper end of the second conductive sheet is desoldered from the conductive end, it can reliably detach from the conductive end. This allows the overload protection unit to cut off the circuit of the controlled circuit, achieving the purpose of overload protection. The aforementioned low-melting-point conductive material can be solder, meaning the upper end of the second conductive sheet is fixed to the conductive end by soldering. Additionally, after the upper end of the second conductive sheet is desoldered from the conductive end, the overload protection unit can release the trigger state of the control unit, causing the control unit to cut off the circuit of the main control circuit. Thus, through the above structure, not only can the controlled circuit (high-voltage circuit) be cut off, but the main control circuit (low-voltage circuit) can also be cut off, achieving dual protection with the advantages of good overload protection effect and high safety.
[0007] In one possible implementation, the control unit includes a circuit board and a trigger switch. The circuit board is connected to a base located between the heat-conducting plate and the second conductive sheet. Two conductive pins protruding from the base are electrically connected to the circuit board. The trigger switch is electrically connected to the circuit board and is connected in series in the main control circuit via the two conductive pins. When the upper end of the second conductive sheet is soldered to the conductive end using a low-melting-point conductive material, the upper end of the second conductive sheet triggers the trigger end of the trigger switch, causing the trigger switch to be in a conducting state. When the overload protection unit is in an overload state, the upper end of the second conductive sheet is desoldered from the conductive end, and the upper end of the second conductive sheet moves away from the conductive end. One side of the hot plate rebounds and releases the trigger state of the trigger switch's trigger end. After the control unit is used, the upper end of the second conductive sheet is welded and fixed to the conductive end with a low melting point conductive material. The upper end of the second conductive sheet can trigger the trigger end of the trigger switch to make the trigger switch in a conducting state. When the overload protection unit experiences an overload, causing the upper end of the second conductive sheet to detach from the conductive end, the upper end of the second conductive sheet can rebound away from the hot plate and release the trigger state of the trigger switch's trigger end. At this time, the control unit can cut off the main control circuit loop to further achieve the purpose of protection, thereby improving the overload protection effect and safety.
[0008] In one possible implementation, the upper part of the second conductive sheet is provided with a protrusion that protrudes from the trigger switch towards the triggering switch, and the protrusion forms a "﹝" shape. After the upper end of the second conductive sheet is welded and fixed to the conductive end by a low-melting-point conductive material, the protrusion triggers the triggering end of the triggering switch to put the triggering switch in a conducting state. With this structure, under the action of the protrusion, after the upper end of the second conductive sheet is welded and fixed to the conductive end by a low-melting-point conductive material, the protrusion can reliably trigger the triggering end of the triggering switch, so that the triggering switch can be reliably kept in a normally closed state. In addition, since the protrusion forms a "﹝" shape, it has the advantages of high structural strength and good deformation resistance, that is, it can reliably trigger the triggering end of the triggering switch.
[0009] In one possible implementation, a first slot is provided in the middle of the base, and the lower end of the circuit board is inserted into the first slot; with this structure, the circuit board can be reliably and conveniently assembled on the base.
[0010] In one possible implementation, a second slot is provided at the rear of the base, into which the lower end of the first conductive sheet and the lower end of the heat-conducting plate are inserted; a third slot is provided at the front of the base, into which the lower end of the second conductive sheet is inserted; with this structure, the first conductive sheet and the heat-conducting plate can be reliably and conveniently assembled onto the base.
[0011] In one possible implementation, the heat-conducting plate is made of ceramic material; by using ceramic material to make the heat-conducting plate, it has the advantages of good insulation effect, good heat conduction effect and low cost.
[0012] In one possible implementation, an annular protrusion is provided on the outer wall of the lower end of the base, and the lower end of the cover covers the outside of the base and abuts against the annular protrusion; a number of locking blocks are provided on the outer wall of the base, and locking holes corresponding to the locking blocks are provided on the side wall of the lower end of the cover, and each locking hole engages with the locking block at the corresponding position; by adopting this structure, the cover can be reliably and conveniently assembled on the base. Attached Figure Description
[0013] Figure 1 This is a three-dimensional structural diagram of the present invention;
[0014] Figure 2 This is a partially exploded three-dimensional structural diagram of the present invention;
[0015] Figure 3 This is a partial exploded three-dimensional structural diagram of the present invention after the cover has been removed;
[0016] Figure 4 This is a schematic diagram of the left-side structure of the present invention after the cover has been removed. Detailed Implementation
[0017] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.
[0018] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.
[0019] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0020] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.
[0021] See Figure 1-4 As shown in the figure, this application discloses an overload protector, including a base 1, a cover 2, an overload protection unit, and a control unit. The overload protection unit and the control unit are both connected to the base 1. The cover 2 covers the overload protection unit and the control unit and is connected to the base 1. The overload protection unit is connected in series in the loop of the controlled circuit, and the control unit is connected in series in the loop of the main control circuit. The control unit is in a state triggered by the overload protection unit. When the overload protection unit is in an overload state, the overload protection unit is used to cut off the loop of the controlled circuit, and the overload protection unit releases the triggering state of the control unit so that the control unit cuts off the loop of the main control circuit.
[0022] The overload protection unit includes a first conductive sheet 31, a second conductive sheet 32, and a heat-conducting plate 33 made of insulating material. The first conductive sheet 31, the second conductive sheet 32, and the heat-conducting plate 33 are all connected to a base 1. The lower end of the first conductive sheet 31 extends outside the base 1 and forms a first terminal 311. The lower end of the second conductive sheet 32 extends outside the base 1 and forms a second terminal 321. The upper end of the first conductive sheet 31 is embedded in the heat-conducting plate 33. A conductive end 312 is provided on the upper end of the first conductive sheet 31, embedded from back to front in the heat-conducting plate 33. The front end of 312 is located at the front end face of the heat-conducting plate 33; the upper end of the second conductive sheet 32 is welded and fixed to the conductive end 312 by a low-melting-point conductive material, and the upper end of the second conductive sheet 32 has elastic potential energy to rebound away from the heat-conducting plate 33 to detach from the conductive end 312; the first conductive sheet 31 and the second conductive sheet 32 are connected in series in the circuit of the controlled circuit through the first terminal 311 and the second terminal 321; by adopting this overload protection unit, when the current flowing through the first conductive sheet and the second conductive sheet exceeds the rated current, the first conductive sheet can activate... The heat generated by the first conductive sheet can be transferred via the heat-conducting plate to the welding point between the conductive end and the upper end of the second conductive sheet. Since the upper end of the second conductive sheet is welded and fixed to the conductive end with a low-melting-point conductive material, it can be de-soldered from the conductive end. Furthermore, because the upper end of the second conductive sheet possesses elastic potential energy to rebound away from the heat-conducting plate and detach from the conductive end, after de-soldering, the upper end of the second conductive sheet can reliably detach from the conductive end. This allows the overload protection unit to cut off the circuit of the controlled circuit, thereby achieving... To achieve overload protection, the aforementioned low-melting-point conductive material can be soldered, meaning the upper end of the second conductive sheet is soldered and fixed to the conductive end. Furthermore, after the upper end of the second conductive sheet is desoldered from the conductive end, the overload protection unit can deactivate the trigger state of the control unit, causing the control unit to cut off the main control circuit loop. Thus, through this structure, not only can the controlled circuit (high-voltage circuit) be cut off, but the main control circuit (low-voltage circuit) can also be cut off, achieving dual protection. This provides excellent overload protection and high safety.
[0023] The control unit includes a circuit board 41 and a trigger switch 42. The circuit board 41 is connected to a base 1 located between the heat-conducting plate 33 and the second conductive sheet 32. Two conductive pins 411 protruding from the base 1 are electrically connected to the circuit board 41. The trigger switch 42 is electrically connected to the circuit board 41 and is connected in series in the main control circuit loop via the two conductive pins 411. When the upper end of the second conductive sheet 32 is soldered and fixed to the conductive end 312 with a low-melting-point conductive material, the upper end of the second conductive sheet 32 triggers the trigger end 421 of the trigger switch 42, causing the trigger switch 42 to be in a conducting state. When the overload protection unit is in an overload state, the upper end of the second conductive sheet 32 is desoldered from the conductive end 312, and The upper end of the second conductive sheet 32 rebounds away from the heat-conducting plate 33 and releases the trigger state of the trigger terminal 421 of the trigger switch 42. After the upper end of the second conductive sheet is fixed to the conductive end by welding with a low melting point conductive material, the upper end of the second conductive sheet can trigger the trigger terminal of the trigger switch to make the trigger switch in the conducting state. When the overload protection unit causes an overload, causing the upper end of the second conductive sheet to desolder from the conductive end, the upper end of the second conductive sheet can rebound away from the heat-conducting plate and release the trigger state of the trigger terminal of the trigger switch. At this time, the control unit can cut off the main control circuit to further achieve the purpose of protection and improve the effect and safety of overload protection.
[0024] The upper part of the second conductive sheet 32 is provided with a protrusion 322 protruding from the trigger switch 42. The protrusion 322 forms a "﹝" shape. When the upper end of the second conductive sheet 32 is welded and fixed to the conductive end 312 by a low melting point conductive material, the protrusion 322 triggers the trigger end 421 of the trigger switch 42, so that the trigger switch 42 is in the conducting state. With this structure, under the action of the protrusion, after the upper end of the second conductive sheet is welded and fixed to the conductive end by a low melting point conductive material, the protrusion can reliably trigger the trigger end of the trigger switch, so that the trigger switch can be reliably kept in the normally closed state. In addition, since the protrusion forms a "﹝" shape, it has the advantages of high structural strength and good deformation resistance, that is, it can reliably trigger the trigger end of the trigger switch.
[0025] A first slot 11 is provided in the middle of the base 1, and the lower end of the circuit board 41 is inserted into the first slot 11; by adopting this structure, the circuit board can be reliably and conveniently assembled on the base.
[0026] The base 1 has a second slot 12 at the rear, into which the lower end of the first conductive sheet 31 and the lower end of the heat-conducting plate 33 are inserted; the base 1 has a third slot 13 at the front, into which the lower end of the second conductive sheet 32 is inserted; with this structure, the first conductive sheet and the heat-conducting plate can be reliably and conveniently assembled on the base.
[0027] The heat-conducting plate 33 is made of ceramic material; by using ceramic material to make the heat-conducting plate, it has the advantages of good insulation effect, good heat conduction effect and low cost.
[0028] An annular protrusion 14 is provided on the outer wall of the lower end of the base 1. The lower end of the cover 2 covers the outside of the base 1 and abuts against the annular protrusion 14. Several locking blocks 15 are provided on the outer wall of the base 1. The side wall of the lower end of the cover 2 is provided with locking holes 21 corresponding to several locking blocks 15. Each locking hole 21 is engaged with the locking block 15 at the corresponding position. With this structure, the cover can be reliably and conveniently assembled on the base.
[0029] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.
Claims
1. An overload protector, characterized in that: It includes a base (1), a cover (2), an overload protection unit, and a control unit; the overload protection unit and the control unit are both connected to the base (1), the cover (2) covers the overload protection unit and the control unit and is connected to the base (1); the overload protection unit is connected in series in the loop of the controlled circuit, the control unit is connected in series in the loop of the main control circuit, and the control unit is in a state triggered by the overload protection unit; When the overload protection unit is in an overload state, the overload protection unit is used to cut off the loop of the controlled circuit, and the overload protection unit releases the trigger state of the control unit so that the control unit cuts off the loop of the main control circuit.
2. The overload protector according to claim 1, characterized in that: The overload protection unit includes a first conductive sheet (31), a second conductive sheet (32), and a heat-conducting plate (33) made of insulating material; the first conductive sheet (31), the second conductive sheet (32), and the heat-conducting plate (33) are all connected to the base (1). The lower end of the first conductive sheet (31) extends out of the base (1) and forms a first terminal (311), the lower end of the second conductive sheet (32) extends out of the base (1) and forms a second terminal (321), and the upper end of the first conductive sheet (31) is embedded in the heat-conducting plate (33). The upper end is provided with a conductive end (312) embedded in the heat-conducting plate (33) from back to front, and the front end of the conductive end (312) is located at the front end face of the heat-conducting plate (33); the upper end of the second conductive sheet (32) is welded and fixed to the conductive end (312) by a low melting point conductive material, and the upper end of the second conductive sheet (32) has elastic potential energy to bounce back to the side away from the heat-conducting plate (33) to get away from the conductive end (312); the first conductive sheet (31) and the second conductive sheet (32) are connected in series in the loop of the controlled circuit through the first terminal (311) and the second terminal (321).
3. The overload protector according to claim 2, characterized in that: The control unit includes a circuit board (41) and a trigger switch (42). The circuit board (41) is connected to a base (1) located between a heat-conducting plate (33) and a second conductive sheet (32). Two conductive pins (411) extending out of the base (1) are electrically connected to the circuit board (41). The trigger switch (42) is electrically connected to the circuit board (41) and is connected in series in the main control circuit loop via the two conductive pins (411). When the second conductive sheet (32) is in the upper part of the heat-conducting plate (32), the trigger switch (42) is connected to the base (1) in the upper part of the heat-conducting plate (32). After the end is welded and fixed to the conductive end (312) by a low melting point conductive material, the upper end of the second conductive piece (32) forms a trigger end (421) of the trigger switch (42) to trigger the trigger switch (42) to be in the conducting state; when the overload protection unit is in the overload state, the upper end of the second conductive piece (32) is de-welded to the conductive end (312), and the upper end of the second conductive piece (32) rebounds to the side away from the heat-conducting plate (33) and releases the trigger state of the trigger end (421) of the trigger switch (42).
4. The overload protector according to claim 3, characterized in that: The upper part of the second conductive sheet (32) is provided with a protrusion (322) that protrudes from the second conductive sheet (32) toward the trigger switch (42), and the protrusion (322) forms a "﹝" shaped structure; when the upper end of the second conductive sheet (32) is fixed to the conductive end (312) by welding with a low melting point conductive material, the protrusion (322) triggers the trigger end (421) of the trigger switch (42) so that the trigger switch (42) is in the conducting state.
5. The overload protector according to claim 3, characterized in that: The base (1) has a first slot (11) in the middle, and the lower end of the circuit board (41) is inserted into the first slot (11).
6. The overload protector according to claim 2, characterized in that: The base (1) has a second slot (12) at its rear, and the lower end of the first conductive sheet (31) and the lower end of the heat-conducting plate (33) are inserted into the second slot (12); the base (1) has a third slot (13) at its front, and the lower end of the second conductive sheet (32) is inserted into the third slot (13).
7. The overload protector according to claim 2, characterized in that: The heat-conducting plate (33) is made of ceramic material.
8. The overload protector according to claim 2, characterized in that: The outer wall of the lower end of the base (1) is provided with an annular protrusion (14), and the lower end of the cover (2) covers the outside of the base (1) and abuts against the annular protrusion (14); the outer wall of the base (1) is provided with a number of locking blocks (15), and the side wall of the lower end of the cover (2) is provided with locking holes (21) corresponding to the number of locking blocks (15) one by one, and each locking hole (21) is engaged with the locking block (15) at the corresponding position.