Overload protector with reset function

Abstract

The utility model discloses an overload protector with a reset function, which comprises a shell, a cavity is arranged in the shell, a fixed terminal and a movable terminal are arranged in the cavity, a bimetallic strip is arranged on the movable terminal, the bimetallic strip abuts against the fixed terminal, a rotating shaft is rotatably arranged in the cavity, a pressing rod and a limiting rod are fixedly arranged on the rotating shaft, and the pressing rod and the limiting rod are fixedly arranged on the rotating shaft. A reset assembly is arranged on the shell and used for driving the limiting rod to rotate, a limiting boss is arranged in the cavity, and the limiting rod is located between the limiting boss and the reset assembly; when overload occurs in the circuit, the current is increased, so that the bimetallic strip is heated and deformed, and the bimetallic strip is separated from the fixed terminal; during resetting, the resetting assembly is pressed to drive the limiting rod and the pressing rod to rotate, the pressing rod drives the bimetallic strip to reset so that the bimetallic strip can make contact with the fixed terminal, the limiting rod abuts against the limiting boss, the limiting boss limits the limiting rod, and the situation that the bimetallic strip is extruded and broken by the pressing rod due to too large force can be effectively avoided; therefore, the protector is prevented from being damaged.

Description

TECHNICAL FIELD

[0001] The utility model relates to overload protector technical field especially, it relates to an overload protector with reset function. BACKGROUND

[0002] Overload protector is the circuit protection device according to the actual need of electrical control industry, can cut off the circuit in time when overload appears in the circuit, protects electrical equipment from being damaged, plays a vital role in the circuit, after overload troubleshooting, need to reset overload protector, make it resume normal work, can continue to protect the overload of circuit. The most overload protectors on the market adopt the deformation of bimetallic strip to cut off the circuit, when the circuit appears overload, through the current increase of bimetallic strip, make bimetallic strip heat deformation, thereby produce deformation and make the circuit cut off, reset through pressing reset key to make bimetallic strip reset, can be normally electrified, but reset key is generally perpendicular to bimetallic strip setting, this leads to the force not easy control when pressing, and pressing force is too big to easily cause bimetallic strip fracture, thereby leading to overload protector damage, at the same time, the height of reset key vertical setting leads to the high overload protector, is not conducive to the design of miniaturization. SUMMARY

[0003] The utility model discloses a kind of overload protectors with reset function, to solve the problems of prior art.

[0004] To solve the above problems, the technical scheme adopted by the utility model is:

[0005] An overload protector with reset function, comprising a housing, a cavity is provided in the housing, a fixed terminal and a movable terminal are provided in the cavity, a bimetallic strip is provided on the movable terminal, the bimetallic strip abuts against the fixed terminal, a rotating shaft is rotatably provided in the cavity, a compression rod and a limiting rod are fixedly provided on the rotating shaft, the compression rod abuts against the bimetallic strip, a reset assembly is provided on the housing for driving the limiting rod to rotate, a limiting boss is provided in the cavity, and the limiting rod is located between the limiting boss and the reset assembly.

[0006] Preferably, the reset assembly includes a reset rod, the reset rod is slidingly provided on the housing, a compression block is fixedly provided at one end of the reset rod in the cavity, and a reset spring is sleeved on the reset rod.

[0007] Preferably, the housing includes an upper shell and a lower shell, a positioning hole is formed in the lower shell, a positioning column is provided on the upper shell, and the positioning column is inserted into the positioning hole.

[0008] Preferably, the side wall of the upper shell is provided with a locking piece, the locking piece is provided with a locking groove, the side wall of the lower shell is provided with a locking block, the locking block is a wedge-shaped structure, the locking block is clamped in the locking groove, and the upper shell and the lower shell are locked and fixed.

[0009] Preferably, the fixed terminal is connected with a first insertion piece, the movable terminal is connected with a second insertion piece, and the first insertion piece and the second insertion piece extend to the outside of the lower shell through the lower shell.

[0010] Preferably, the lower shell is provided with a first insertion groove, one side of the first insertion groove is provided with a second insertion groove, the fixed terminal is inserted into the first insertion groove, and the movable terminal is inserted into the second insertion groove.

[0011] Preferably, the lower shell is provided with a lower insertion hole, the upper shell is provided with an upper insertion hole, the positions of the upper insertion hole and the lower insertion hole correspond to each other, and the two ends of the rotating shaft are respectively inserted into the lower insertion hole and the upper insertion hole.

[0012] Preferably, the bimetallic strip is provided with a movable contact point, the fixed terminal is provided with a fixed contact point, and the movable contact point and the fixed contact point abut against each other.

[0013] The technical scheme has the beneficial effects that:

[0014] In the utility model, when the bimetallic strip and the fixed terminal abut against each other, the circuit is in a conduction state, when the circuit is overloaded, the bimetallic strip generates heat and deforms, and is separated from the fixed terminal, so that the circuit is disconnected, the function of protecting the circuit is realized, after troubleshooting, the bimetallic strip needs to be reset, the reset rod is pressed to drive the pressing rod and the limiting rod to rotate, the pressing rod pushes the bimetallic strip to move to one side of the fixed terminal, until the bimetallic strip and the fixed terminal abut against each other, and the limiting rod abuts against the limiting convex platform, so that the limiting rod cannot continue to rotate, thereby limiting, avoiding that the bimetallic strip is broken due to excessive force of the pressing rod and causing damage; meanwhile, the reset rod is arranged in parallel with the bimetallic strip, so that the height of the overload protector can be reduced, and the structure of the overload protector is more compact. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a three-dimensional schematic view of the utility model;

[0016] Figure 2 It is a schematic view of the internal structure of the utility model;

[0017] Figure 3 It is a three-dimensional schematic view of the upper shell of the utility model;

[0018] Figure 4 It is a three-dimensional schematic view of the lower shell of the utility model;

[0019] Figure 5Is the utility model's movable terminal three -dimensional schematic view;

[0020] Figure 6 Is the utility model's fixed terminal three -dimensional schematic view.

[0021] In the drawing: 1 is the shell, 2 is fixed terminal, 3 is movable terminal, 4 is bimetallic strip, 5 is rotating shaft, 6 is compression rod, 7 is limit rod, 8 is limit boss, 9 is reset rod, 10 is compression block, 11 is reset spring, 12 is upper shell, 13 is lower shell, 14 is positioning hole, 15 is positioning column, 16 is locking piece, 17 is locking groove, 18 is locking block, 19 is first insert piece, 20 is second insert piece, 21 is first insert groove, 22 is second insert groove, 23 is lower insertion hole, 24 is upper insertion hole, 25 is movable contact, 26 is fixed contact. DETAILED DESCRIPTION

[0022] The embodiments of the utility model will be further described in detail below in combination with the drawings and examples. The following examples are used to illustrate the utility model, but cannot be used to limit the scope of the utility model.

[0023] In the description of the utility model, it needs to be explained that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0024] In the description of the utility model, it needs to be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected, it can be mechanical connection, or electrical connection, it can be directly connected, or indirectly connected through intermediate medium, it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0025] As Figure 1 And Figure 2As shown, an overload protector with reset function, including shell 1, the shell 1 is provided with closed cavity, the cavity is fixed with fixed terminal 2 and movable terminal 3, movable terminal 3 is connected with bimetallic strip 4, bimetallic strip 4 can produce deformation and bend after being heated, bimetallic strip 4 is in contact with fixed terminal 2 in normal state, and bimetallic strip 4 can be separated from fixed terminal 2 after being heated and deformed, a rotating shaft 5 is rotatably arranged in the cavity, the rotating shaft 5 is fixedly provided with a compression rod 6 and a limiting rod 7, the compression rod 6 is in contact with the bimetallic strip 4, and the compression rod 6 can rotate with the rotating shaft 5 as the center, the shell 1 is provided with a reset assembly, the reset assembly can slide on the shell 1, and is used for driving the limiting rod 7 to rotate with the rotating shaft 5 as the center, a limiting boss 8 is arranged in the cavity, and the limiting rod 7 is located between the limiting boss 8 and the reset assembly;In the utility model, under the normal conduction state of circuit, bimetallic strip 4 is in contact with fixed terminal 2, so that current can pass normally, and when load overload occurs in the circuit, the current in the circuit increases, bimetallic strip 4 is heated, bimetallic strip 4 is deformed after being heated and separated from fixed terminal 2, and the deformed bimetallic strip 4 is raised to one side of the compression rod 6 and in contact with the compression rod 6, so that the circuit is in an open state, when the fault is repaired, the overload protector needs to be reset to make the circuit re-conduct, at this time, the limiting rod 7 and the compression rod 6 are rotated to one side of the fixed terminal 2 by pressing the reset assembly, the compression rod 6 extrudes the bimetallic strip 4, so that the bimetallic strip 4 is in contact with the fixed terminal 2 again, so that the circuit is conducted, and in the reset process, in order to avoid that the reset assembly is pressed too hard, the compression rod 6 extrudes the bimetallic strip 4 too much, and the bimetallic strip 4 is broken, the limiting boss 8 is arranged in the cavity, the limiting rod 7 is in contact with the limiting boss 8 with the rotation of the limiting rod 7 and the compression rod 6, the limiting boss 8 limits the limiting rod 7 to avoid continuous rotation, so that the compression rod 6 can also stop rotating, the compression rod 6 can effectively avoid extruding the bimetallic strip 4 too much, and the bimetallic strip 4 can be protected.

[0026] Further, as Figure 2As shown, the reset assembly comprises a reset rod 9 which is slidingly arranged on the shell 1, one end of the reset rod 9 is located in the cavity in the shell 1, the other end extends to the outside of the shell 1, the reset rod 9 is arranged in parallel with the bimetallic strip 4, one end of the reset rod 9 located in the cavity is fixedly provided with a pressing block 10, the pressing block 10 can abut against the limiting rod 7, a reset spring 11 is sleeved on the reset rod 9, the reset spring 11 is located in the cavity of the shell 1, one end of the reset spring 11 is fixedly connected with the side wall of the shell 1, the other end is fixedly connected with the pressing block 10, when the overload protector is reset, the reset rod 9 is slid to the cavity of the shell 1 by pressing one end of the reset rod 9 located outside the shell 1, so that the pressing block 10 abuts against the limiting rod 7 and drives the limiting rod 7 to rotate until the limiting rod 7 abuts against the limiting boss 8, in the process of sliding of the reset rod 9, the reset spring 11 is stretched, when the reset is completed, the reset rod 9 slides to the outside of the shell 1 under the driving of the reset spring 11, the pressing block 10 is separated from the limiting rod 7, since the reset rod 9 is arranged in parallel with the bimetallic strip 4, the height of the overload protector can be reduced, so that the overload protector can be more compact in structure, and the volume of the overload protector can be more compact.

[0027] Further, as shown in Figure 1 , Figure 3 and Figure 4 , the shell 1 comprises an upper shell 12 and a lower shell 13, the upper shell 12 and the lower shell 13 are detachably fixedly connected, the lower shell 13 is provided with a positioning hole 14, the upper shell 12 is provided with a positioning column 15, when the upper shell 12 and the lower shell 13 are fixedly connected, the positioning column 15 is inserted into the positioning hole 14, so that the upper shell 12 and the lower shell 13 can be accurately positioned; the side wall of the upper shell 12 is provided with a locking piece 16, the locking piece 16 is provided with a locking groove 17, the side wall of the lower shell 13 is provided with a locking block 18, the locking block 18 is a wedge-shaped structure, when the upper shell 12 and the lower shell 13 are folded and fixedly connected, the locking block 18 can be clamped in the locking groove 17, since the locking block 18 is a wedge-shaped structure, the locking block 18 is not easy to separate from the locking groove 17.

[0028] Further, as shown in Figure 5 and Figure 6 , the fixed terminal 2 is connected with a first insertion piece 19, the fixed terminal 2 and the first insertion piece 19 are an integrally formed metal sheet, the movable terminal 3 is connected with a second insertion piece 20, the movable terminal 3 and the second insertion piece 20 are an integrally formed metal sheet, the first insertion piece 19 and the second insertion piece 20 extend to the outside of the lower shell 13 through the lower shell 13, the first insertion piece 19 and the second insertion piece 20 are connected with the load in the circuit, so as to form a complete loop, so that the load can work normally.

[0029] Further, as shown in Figure 3 and Figure 4As shown in the drawings, the lower shell 13 is provided with a first slot 21, one side of the first slot 21 is provided with a second slot 22, the shape of the first slot 21 corresponds to the shape of the fixed terminal 2, the fixed terminal 2 is inserted into the first slot 21, so that the fixed terminal 2 is fixedly arranged in the first slot 21, the shape of the second slot 22 corresponds to the box shape of the movable terminal 3, the movable terminal 3 is inserted into the second slot 22, so that the movable terminal 3 is fixedly arranged in the second slot 22.

[0030] Further, as shown in the drawings, Figure 3 and Figure 4 As shown in the drawings, the lower shell 13 is provided with a lower insertion hole 23, the lower insertion hole 23 is located between the limiting boss 8 and the second slot 22, the upper shell 12 is provided with an upper insertion hole 24, after the upper shell 12 and the lower shell 13 are spliced and fixed, the position of the upper insertion hole 24 corresponds to the position of the lower insertion hole 23, the two ends of the rotating shaft 5 are respectively inserted into the lower insertion hole 23 and the upper insertion hole 24, so that the rotating shaft 5 avoids displacement during rotation.

[0031] Further, as shown in the drawings, Figure 5 and Figure 6 As shown in the drawings, the movable contact 25 is arranged on the bimetallic strip 4, the fixed contact 26 is arranged on the fixed terminal 2, in the on state of the circuit, the movable contact 25 and the fixed contact 26 abut, the movable contact 25 and the fixed contact 26 can be silver material, which has better conductivity, when the bimetallic strip 4 and the fixed terminal 2 are separated due to overload of the circuit, the movable contact 25 and the fixed contact 26 are separated, so that the circuit is disconnected, which plays a role in protecting the circuit.

[0032] Finally, it should be noted that: the above examples are only used to illustrate the technical scheme of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical scheme recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical scheme deviate from the spirit and scope of the technical scheme of the present application.

Claims

1. An overload protector with a reset function, characterized in that, The device includes a housing (1), which has a cavity. The cavity contains a fixed terminal (2) and a movable terminal (3). The movable terminal (3) has a bimetallic strip (4) that abuts against the fixed terminal (2). A rotating shaft (5) is rotatably mounted in the cavity. A clamping rod (6) and a limiting rod (7) are fixedly mounted on the rotating shaft (5). The clamping rod (6) abuts against the bimetallic strip (4). The housing (1) has a reset assembly for driving the limiting rod (7) to rotate. A limiting boss (8) is provided in the cavity. The limiting rod (7) is located between the limiting boss (8) and the reset assembly.

2. An overload protector with a reset function according to claim 1, characterized in that, The reset assembly includes a reset rod (9), which is slidably disposed on the housing (1). A clamping block (10) is fixedly disposed at one end of the reset rod (9) located in the cavity, and a reset spring (11) is sleeved on the reset rod (9).

3. An overload protector with a reset function according to claim 1, characterized in that, The housing (1) includes an upper shell (12) and a lower shell (13). The lower shell (13) has a positioning hole (14), and the upper shell (12) has a positioning post (15). The positioning post (15) is inserted into the positioning hole (14).

4. An overload protector with a reset function according to claim 3, characterized in that, The upper shell (12) has a locking piece (16) on its side wall, and a locking groove (17) is provided on the locking piece (16). The lower shell (13) has a locking block (18) on its side wall. The locking block (18) is a wedge-shaped structure and is engaged in the locking groove (17) for locking and fixing the upper shell (12) and the lower shell (13).

5. An overload protector with a reset function according to claim 3, characterized in that, A first insert (19) is connected to the fixed terminal (2), and a second insert (20) is connected to the moving terminal (3). The first insert (19) and the second insert (20) extend through the lower shell (13) to the outside of the lower shell (13).

6. An overload protector with a reset function according to claim 3, characterized in that, The lower shell (13) is provided with a first slot (21), and a second slot (22) is provided on one side of the first slot (21). The fixed terminal (2) is inserted into the first slot (21), and the moving terminal (3) is inserted into the second slot (22).

7. An overload protector with a reset function according to claim 3, characterized in that, The lower shell (13) is provided with a lower insertion hole (23), and the upper shell (12) is provided with an upper insertion hole (24). The upper insertion hole (24) and the lower insertion hole (23) are positioned correspondingly, and the two ends of the rotating shaft (5) are respectively inserted into the lower insertion hole (23) and the upper insertion hole (24).

8. An overload protector with a reset function according to claim 1, characterized in that, The bimetallic strip (4) is provided with a moving contact (25), and the fixed terminal (2) is provided with a fixed contact (26). The moving contact (25) and the fixed contact (26) abut against each other.

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