Current overload protection structure convenient to rebound

Abstract

The utility model discloses a current overload protection structure convenient to rebound, which comprises a shell and a cover plate hooked and fixed at the side part of the shell, an installation cavity is arranged in the shell, and an overload protection unit and a terminal unit electrically matched with the overload protection unit are arranged in the installation cavity. A switch unit used for pushing the overload protection unit to be bent and powered on is further arranged in the installation cavity. A protruding structure used for facilitating springback and pressing limiting to generate abutting force is further arranged in the installation cavity, and the protruding structure is matched with the overload protection unit in an abutting mode. According to the utility model, the structure design is reasonable, the protruding structure is arranged in the direction of the bimetallic strip in an extending manner, so that when the bimetallic strip is heated to deform and rebound, the protruding structure can provide resilience force for the bimetallic strip, the resilience is convenient, the static contact and the movable contact are ensured to be thoroughly disconnected when current is overloaded, and the static contact and the movable contact are not damaged in the process of re-pressing the bimetallic strip to bend and electrify. And the bulge structure is used for limiting the bimetallic strip and applying an abutting force to the bimetallic strip, so that the service life of the bimetallic strip is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of overload protector, especially to a current overload protection structure convenient to rebound. BACKGROUND

[0002] Many electrical equipment in the process of using, will appear because the load is too large, line short circuit, equipment insulation aging and cause line current is too large, when line current is too large, continue to use the equipment, will lead to its heat even burn, if the line is under the action of strong electricity for a long time, will also reduce the insulation performance of line or burn the line.

[0003] Therefore, the electrical equipment generally will be in series overload protector, in the electrical equipment operation process appears abnormal situation leads to current is too large, the excessive current will make the line temperature rise, the bimetallic strip in the overload protector will change due to heat, the action of deformation makes the movable contact of bimetallic strip and static contact separate, thereby making the loop of equipment disconnect, avoid electrical equipment long time under the operation of excessive current, reach the purpose of protecting electrical equipment.

[0004] In the existing overload protector, the bimetallic strip will appear bending deformation in the process of rebounding due to heat, and in the process of re-pressing power-on, with the longer the using time, the elasticity of bimetallic strip will gradually weaken, after the elasticity of bimetallic strip reduces, in the process of rebounding due to heat, it may appear that the movable contact and the static contact cannot be completely separated due to insufficient rebounding force, which is easy to lead to the occurrence of safety accidents. TECHNICAL PROBLEM

[0005] The utility model solves the technical problem in the prior art, and provides a current overload protection structure convenient to rebound.

[0006] The utility model adopts the technical scheme that a current overload protection structure convenient to rebound, including shell and the hooking fixed in the lateral portion of shell cover, being equipped with installation cavity in the shell, being equipped with overload protection unit and the terminal unit of electric cooperation with overload protection unit in the installation cavity, still being equipped with the switch unit for bending power-on of pushing overload protection unit in the installation cavity, the switch unit is arranged in the upper portion of overload protection unit, and the terminal unit is arranged in the lower portion of overload protection unit, still being equipped with the convex structure for the rebound of convenient, the down pressure limit produces the resistance force of resistance and cooperation in the installation cavity, and the convex structure and overload protection unit resistance cooperation.

[0007] Preferably, the terminal unit includes a static terminal and a movable terminal, the overload protection unit includes a bimetallic strip for controlling current overload disconnection, one end of the bimetallic strip is inserted and fixed at the top of the movable terminal, and the other end of the bimetallic strip is riveted or spot-welded with a movable contact electrically connected to the static terminal.

[0008] Preferably, the installation cavity is provided with an installation platform for resisting the installation of the static terminal end, and the static terminal is arranged at one end of the installation platform and is riveted or spot-welded to fix the static contact point electrically connected with the moving contact point.

[0009] Preferably, the protruding structure is arranged at one end of the installation platform away from the static terminal and extends towards the bimetallic strip, the protruding structure is arranged perpendicularly to the installation platform, and a buffer gap is arranged between the top of the protruding structure and the bimetallic strip for facilitating rebound.

[0010] Preferably, the switch unit is movably arranged on the shell, the switch unit comprises a button and a pusher clamped in the button, a pin is inserted at the bottom of the pusher, a metal block for preventing spark caused by excessive current is fixed at the bottom of the pin, and the metal block is arranged close to the bimetallic strip.

[0011] Preferably, the button is provided with a button sleeve clamped in the inner wall of the top of the shell, a spring is sleeved on the pusher, one end of the spring is in abutment connection with the metal block, and the other end of the spring is in abutment connection with the inner wall of the shell.

[0012] Preferably, the cover plate is fixedly connected to the side of the shell by rivets.

[0013] Compared with the prior art, the bimetallic strip is provided with a protruding structure extending towards the bimetallic strip, so that when the bimetallic strip is deformed and rebounds due to heat, the protruding structure can provide a rebound force for the bimetallic strip, facilitating rebound, ensuring that the static contact point and the moving contact point are completely disconnected when the current is overloaded, and the protruding structure is used for limiting the bimetallic strip and providing an abutment force for the bimetallic strip during the process of bending the bimetallic strip to pass electricity again, thereby prolonging the service life of the bimetallic strip. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1 is a structural schematic view of the utility model;

[0015] Fig. 2 is a structural schematic view of the utility model;

[0016] Fig. 3 is an exploded structural schematic view of the switch unit of the utility model.

[0017] Fig. 1 is a shell; 2 is a cover plate; 3 is an installation cavity; 4 is a protruding structure; 5 is a static terminal; 6 is a moving terminal; 7 is a bimetallic strip; 8 is a moving contact point; 9 is an installation platform; 10 is a static contact point; 11 is a buffer gap; 12 is a button; 13 is a pusher; 14 is a pin; 15 is a metal block; 16 is a button sleeve; 17 is a spring; 18 is a rivet. DETAILED DESCRIPTION

[0018] The embodiments of the present application will be described herein below with reference to drawings. Numerous specific details will be set forth in the following description in order to provide a thorough understanding of the application. However, it will be appreciated that the application can be practiced without specific details and with other methods, components, etc. In other instances, well-known structures and components are not described in detail in order to avoid obscuring the application.

[0019] It should be noted that all directional indications, such as upper, lower, left, right, front, back, and the like, are merely used for convenience of description and are not intended to limit the application. The directional indications are relative and are based on the orientation of the device as shown in the drawings.

[0020] In addition, some terms can be used to represent not only the orientation or position relationship, but also other meanings. For example, the term "upper" may, in some cases, be used to represent a certain dependent relationship or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the present application according to the specific circumstances.

[0021] In addition, the terms "mounting", "setting", "providing", "connecting", "connecting", "sleeving" should be understood broadly. For example, it can be fixedly connected, detachably connected, or integrally configured; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediate medium, or it can be the internal communication between two devices, elements or components. The connection mode involved in this paper is prior art and has not been improved. It is common knowledge to those skilled in the art. Those skilled in the art can understand the specific meaning of the above terms in the present application according to the specific circumstances.

[0022] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and does not mean to specially indicate the order or sequence, nor to limit the present application. It is only to distinguish the components or operations described by the same technical terms, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions contradicts each other or cannot be realized, it should be considered that the combination of technical solutions does not exist and is not within the protection scope required by the present application.

[0023] For example, Figs. 1 to 3The utility model provides a kind of current overload protection structure of convenient rebound, including shell 1 and the cover plate 2 hooked and fixed in the side portion of shell 1, installation cavity 3 is equipped in shell 1, overcurrent protection unit and the terminal unit electrically cooperate with overcurrent protection unit are equipped in installation cavity 3, installation cavity 3 is also equipped with the switch unit for pushing overcurrent protection unit bending power on, switch unit is arranged in the upper portion of overcurrent protection unit, and terminal unit is arranged in the lower portion of overcurrent protection unit;Specifically, installation cavity 3 is also equipped with the protruding structure 4 for facilitating rebound, down pressure limit generates the protruding structure 4 and overcurrent protection unit and is contacted with each other.

[0024] The terminal unit includes static terminal 5 and dynamic terminal 6, and the static terminal 5 and the dynamic terminal 6 are both in a bent shape. The bottom ends of the static terminal 5 and the dynamic terminal 6 both extend to the outside of the shell 1. The overcurrent protection unit includes a bimetallic strip 7 for controlling current overload disconnection. Specifically, one end of the bimetallic strip 7 is inserted and fixed at the top of the dynamic terminal 6, and the other end of the bimetallic strip 7 is riveted or spot-welded with a movable contact 8 electrically cooperating with the static terminal 5.

[0025] The installation cavity 3 is provided with an installation platform 9 for contacting the end of the static terminal 5. Specifically, the static terminal 5 is arranged at one end of the installation platform 9 and is riveted or spot-welded with a static contact 10 electrically cooperating with the movable contact 8. The dynamic terminal 6 is arranged at one end of the installation cavity 3 and is provided with an installation column for fixing the bimetallic strip 7.

[0026] The connection and fixing modes of the movable contact 8 and the bimetallic strip 7, and the static contact 10 and the static terminal 5 are both riveting or spot-welding. When the thickness of the bimetallic strip 7 and the static terminal 5 is relatively thin, the spot-welding fixing connection mode is adopted to prevent the bimetallic strip 7 from being broken down and causing a fire when the flowing current is too large. When the thickness of the bimetallic strip 7 and the static terminal 5 is relatively thick, the riveting fixing connection mode is adopted.

[0027] The protruding structure 4 is arranged at one end of the installation platform 9 away from the static terminal 5 and extends towards the bimetallic strip 7. Specifically, the protruding structure 4 is perpendicular to the installation platform 9, and a buffer gap 11 for facilitating rebound is formed between the top of the protruding structure 4 and the bimetallic strip 7.

[0028] The switch unit is movably arranged on the shell 1. The switch unit includes a button 12 and a pushing piece 13 clamped in the button 12. A pin 14 is inserted at the bottom of the pushing piece 13. Specifically, a metal block 15 for preventing sparks caused by excessive current is fixed at the bottom of the pin 14, and the metal block 15 is arranged close to the bimetallic strip 7.

[0029] The switch unit pushes the movable contact 8 downward. The movable contact 8 moves downward under the action of the elasticity of the bimetallic strip 7 until the movable contact 8 is in contact with the static contact 10.

[0030] The button 12 is sleeved with a button sleeve 16 which is clamped in the inner wall of the top of the shell 1.

[0031] The cover plate 2 is fixedly connected to the side of the shell 1 by riveting nails 18.

[0032] The working principle of the utility model is as follows: during the use of the electric equipment, one end of the bimetallic strip 7 where the moving contact 8 is arranged is bent downward, the moving contact 8 on the bimetallic strip 7 is in contact connection with the static contact 10 on the static terminal 5, at this time, the bimetallic strip 7 is bent downward near the middle part and is in abutting connection with the top of the protruding structure 4, the protruding structure 4 limits the bending of the bimetallic strip 7, and the protruding structure 4 provides the bimetallic strip 7 with an upward springback force; when the current between the static contact 10 and the moving contact 8 is too large, the temperature of the moving contact 8 and the bimetallic strip 7 will rise, and the bimetallic strip 7 will be deformed, in the deformation process, the elasticity of the bimetallic strip 7 gradually weakens until the moving contact 8 and the static contact 10 are separated, in the separation process, the upward springback force of the protruding structure 4 on the bimetallic strip 7 acts on the bimetallic strip 7, so that the bimetallic strip 7 can spring back conveniently, thereby ensuring that the moving contact 8 and the static contact 10 are completely separated, the current is disconnected, and the electric appliance is protected;

[0033] When the temperature of the bimetallic strip 7 drops, the button 12 is pressed downward, the button 12 drives the pusher 13 to move downward synchronously, the pusher 13 drives the pin 14 and the metal block 15 fixed at the bottom of the pin 14 to move downward synchronously, and the spring 17 is stretched until the bottom of the metal block 15 abuts against the bimetallic strip 7 and drives the bimetallic strip 7 to bend downward until the moving contact 8 and the static contact 10 re-contact and are electrically connected, in the pressing process, the heat-resistant metal block 15 structure arranged at the bottom of the button 12 enables the button 12 to withstand high temperature, avoids damage to the button 12, greatly improves the stability of use, and reduces the use cost; after the button 12 is pressed, the button 12 returns to the original position under the action of the springback force of the spring 17.

[0034] The utility model has the advantages that the protruding structure 4 is arranged in the direction of the bimetallic strip 7, so that the protruding structure 4 can provide the bimetallic strip 7 with a springback force when the bimetallic strip 7 springs back after being deformed by heat, the bimetallic strip 7 can spring back conveniently, the static contact 10 and the moving contact 8 are completely disconnected when the current is overloaded, the protruding structure 4 is used for limiting the bimetallic strip 7 and providing the bimetallic strip 7 with an abutting force during the process of bending the bimetallic strip 7 again to pass electricity, and the service life of the bimetallic strip 7 is improved.

[0035] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example" or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or features of different embodiments or examples described in the present specification without contradiction.

[0036] The standard parts used in the present application can be purchased from the market, and the special-shaped parts can be ordered according to the description and drawings. The specific connection mode of each part adopts the conventional means of mature bolt, rivet, welding, sticking and the like in the prior art, which will not be described in detail here.

[0037] The above is only a preferred embodiment of the present application. For those skilled in the art, according to the idea of the present application, various modifications and changes can be made in the specific implementation mode and application range. The content of the specification should not be understood as a limitation of the present application. Any modification, equivalent replacement, improvement and the like made within the spirit and principles of the present application should be included in the scope of the claims of the present application.

Claims

1. A current overload protection structure with convenient rebound, comprising a shell and a cover plate hooked and fixed to the side of the shell, and a mounting cavity is arranged in the shell, characterized in that: The installation cavity is provided with an overload protection unit and a terminal unit electrically matched with the overload protection unit, and is further provided with a switch unit for pushing the overload protection unit to bend and pass electricity, the switch unit is arranged at the upper part of the overload protection unit, and the terminal unit is arranged at the lower part of the overload protection unit; the installation cavity is further provided with a protruding structure for facilitating rebound, down pressure limiting and resistance force generation, and the protruding structure is in resistance matching with the overload protection unit.

2. A convenient spring-back current overload protection structure according to claim 1, characterized in that: The terminal unit comprises a static terminal and a dynamic terminal, the overload protection unit comprises a bimetallic strip for controlling current overload disconnection, one end of the bimetallic strip is inserted and fixed at the top of the dynamic terminal, and the other end of the bimetallic strip is riveted or spot-welded with a dynamic contact point electrically matched with the static terminal.

3. A snap-back current overload protection structure according to claim 2, wherein: The installation cavity is provided with an installation platform for resisting the installation of the end part of the static terminal, and the static terminal is arranged at one end of the installation platform and is riveted or spot-welded with a static contact point electrically matched with the dynamic contact point.

4. The easy-rebound current overload protection structure of claim 3, wherein: The protruding structure is arranged at one end of the installation platform away from the static terminal and extends towards the bimetallic strip, the protruding structure is arranged perpendicularly to the installation platform, and a buffer gap for facilitating rebound is formed between the top of the protruding structure and the bimetallic strip.

5. The easy-rebound current overload protection structure of claim 2, wherein: The switch unit is movably arranged on the shell, the switch unit comprises a button and a pushing piece clamped in the button, a pin is inserted at the bottom of the pushing piece, a metal block for preventing spark caused by excessive current is fixed at the bottom of the pin, and the metal block is arranged close to the bimetallic strip.

6. A snap-back current overload protection structure according to claim 5, wherein: The button is provided with a button sleeve clamped in the inner wall of the top of the shell, a spring is sleeved on the pushing piece, one end of the spring is in resistance connection with the metal block, and the other end of the spring is in resistance connection with the inner wall of the shell.

7. The easy-rebound current overload protection structure of claim 1, wherein: The cover plate is fixedly connected to the side of the shell by rivets.

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