CN111477521A - A thermal trip structure and a surge protector using the same - Google Patents

Abstract

The invention discloses a thermal tripping structure and a surge protector thereof. After receiving an abnormal temperature rise signal, the circuit breaking protection circuit is actuated in time. The conductor structure of the outlet end makes the conductor have a tendency to move away from the circuit through the dynamic body arranged inside the conductor; at least one end of the inlet end and the outlet end of the conductor is connected to the outer conductor through a low-melting point conductive material, and the low The melting point conductive material loses its confinement to the conductor after being melted by heat. By building the power body in the conductor, the present invention not only has a small volume and is easy to install, but also can directly act on the conductor and has high stability.

Description

A thermal trip structure and a surge protector using the same

technical field

The invention belongs to the technical field of lightning protection equipment, and in particular relates to a thermal tripping structure and a surge protector using the structure.

Background technique

Surge protector, also known as lightning arrester, is an electronic device that provides safety protection for various electronic equipment, instrumentation, and communication lines. In the low-voltage power distribution system, when the electrical circuit or communication line suddenly generates a peak current or voltage due to external interference, the surge protector can conduct the shunt in a very short time, such as overvoltage caused by lightning, so as to avoid Surge damage to other equipment in the circuit.

In the surge protector, a tripping mechanism is usually integrated in order to prevent the internal functional components from overheating and catching fire. The so-called tripping mechanism is an important part of the operating system that promotes the automatic tripping of switches or other electrical components. Most common tripping mechanisms are set in the circuit breaker. The tripping mechanism in the circuit breaker acts like a fulcrum of force. When the circuit breaker automatically trips, the tripping mechanism is manipulated by the tripping device to release this fulcrum and make the circuit breaker enter the free opening state.

The thermal trip structure is often used in the surge protector, which collects the temperature change signal of the functional components in the surge protector. When an abnormal temperature rise occurs, special components in the thermal trip structure will be caused by temperature transfer. Its temperature rises in tandem to produce physical changes that cause parts that would otherwise have a tendency to break to break. The existing thermal trip structure is not applicable because it needs to be attached to the functional components, but at the same time, in order to have a better breaking effect, its volume or range of motion is large, and an independent power body is provided externally to provide a detachment trend. for a small installation space.

SUMMARY OF THE INVENTION

In order to solve the problems existing in the prior art, the present invention provides a thermal trip structure and a surge protector using the structure.

The technical scheme adopted in the present invention is:

A thermal tripping structure, which can actuate a circuit breaker protection circuit in time after receiving an abnormal temperature rise signal, including a power body and a conductor, the conductor is a conductor structure including an access end and an outgoing end, and is arranged on the conductor. The internal dynamic body makes the conductor have a tendency to move out of the circuit;

At least one end of the incoming end and the outgoing end of the conductor is connected to the outer conductor through a low-melting point conductive material, and the low-melting point conductive material loses its restriction on the conductor after being melted by heat.

The thermal tripping structure is a common action unit in circuit protection equipment. The device includes the type that only provides power as an action structure, and also includes the type of action parts that have a conductive function at the same time. This equipment is generally installed in various electrical equipment to prevent its functional components from overheating and catching fire.

Because the main reasons for heat and fire in electrical equipment are leakage current, overload, overvoltage surge and other faults in the circuit, the electric energy in other functional components such as current limiting and voltage limiting is excessively converted into heat energy, which lasts for a certain period of time. After the fault is maintained, the temperature continues to rise and cause a fire in itself or the external structure.

In order to prevent the internal functional components from abnormally heating and catching fire, the most effective way is to cut off the circuit. However, since the corresponding functional components cannot cut off the power supply through their own actions, they need to be protected by external protective equipment.

The protective equipment mainly includes a signal receiving structure and an action structure. After receiving an abnormal signal, the corresponding functional component is disconnected from the circuit through the action mechanism. The so-called signal is the fault signal, which includes current signal, voltage signal, temperature signal, magnetic field signal and other parameter values that can change with the occurrence of faults. There are rules or deep learning models to judge, and when the eigenvalues that appear match the fault threshold, it is judged that there is a fault.

Most of the above technical means use complex circuit control equipment for data analysis, and are often used in medium and large electrical equipment. However, many low-voltage small electrical equipment does not have an active circuit breaker structure. In order to reduce costs and improve stability, passive tripping structures are used.

The signal receiving structure in the passive protection structure mostly adopts the electromagnetic coil structure to connect to the circuit. Once a fault current occurs in the circuit, the current passes through the electromagnetic coil and causes the armature provided inside it to act, and the armature pushes the component to shift and open the circuit.

The fault current that caused the fire may not cause the electromagnetic coil to generate enough driving force to achieve the breaking, and the functional components will continue to heat up at this time. By adopting a thermal trip structure to accept thermal signals, it will automatically disconnect when the temperature rises to a threshold value.

In the existing thermal trip structure, in order to achieve the instant breaking effect, it is usually arranged close to the functional component, so that the thermal signal can quickly reach the receiving structure. The so-called heat signal is the way of heat conduction through the medium, which causes the temperature of the receiving structure to rise. Due to the change of temperature, the physical form of the special material will change. The outer conductor is attached and fixed. If the temperature rises to the melting point, the structure melts and falls off, causing the structure on the side that originally had a tendency to break away to return to its original position, so as to achieve the purpose of tripping.

Since it needs to be attached to the functional parts, but at the same time, in order to have a better breaking effect, its volume or range of motion is large, and the independent power body is provided externally to provide a detachment trend, so it cannot be applied to a small installation space.

By building the power body in the conductor, the present invention not only has a small volume and is easy to install, but also can directly act on the conductor and has high stability.

Further, the power body and the electrical conductor are both connected to the same fixed structure, the electrical conductor is rotatably connected to the fixed structure, and the power body is movably connected to the fixed structure and can move in a straight line;

The moving direction of the power body is perpendicular to the rotation axis of the conductor, and one end of the power body is attached to the end of the conductor away from the rotation axis, and the space angle between the attached end surface and the movement direction of the power body is an acute angle.

The power body is a structure arranged in the conductor to operate, and since the power body can always give a certain power under the normal state of the conductor, the power body and the conductor are always connected or attached. The power body provides the motive force through the internal structure. If a force is needed to push the conductor to move, its end away from the contact with the conductor is fixed on another structure, so as to push the conductor to move relative to the structure.

The conductors move in more ways, and the displacement in the way of rotation is small. Since the conductor is provided with an incoming end and an outgoing end, which are respectively connected to the external conductor to form a series circuit, if the conductor is displaced, the best solution is to weld either the incoming end or the outgoing end with the external conductor through a low melting point material. , and the other end is connected by a soft or a structure capable of synchronously generating displacement and maintaining electrical connection.

In this scheme, since the conductor is rotatably connected with the fixed structure, and the rotating connection part is provided with a rotating shaft, the displacement of the part close to the rotating shaft is the smallest when the conductor moves, and the part is connected to the external conductor through the soft conductive material. connect. The displacement of one end away from the rotating shaft is the largest, and this part is welded to the outer conductor through a low-melting-point conductive material. This solution can not only ensure a stable tripping effect, and the distance between the two ends connected by the low-melting point conductive material is larger after the conductor is rotated outwards; On the premise of resistance, less soft materials are used and the cost is lower.

It is worth noting that in order to achieve an efficient tripping effect in a small space, it is necessary to maintain a relatively stable thrust of the power body within a certain displacement range. Then, the compressed elastomer material is built in as the motive force, and the elastic force of the dynamic body is less attenuated when moving by setting a suitable length.

However, since the conductor is set in rotation, the contact surface between the power body moving in a straight line and the conductor is an inclined plane to achieve effective transmission. Compared with the prior art, since the power body is accommodated in the conductor body, and the power body is set in a linear motion mode, the thrust force component received by the conductor body is relatively uniform within the displacement range of the power body through the structural arrangement of the inclined plane. And by setting an appropriate angle, the magnitude of the thrust component can be satisfied without causing a false break. If the angle is greater than 90 degrees, even if the low-melting point conductive material on the conductor side is melted, the power body cannot operate.

Further, the electrical conductor is covered on the power body, an escape groove is provided on the power body for any external conductor to pass through, and the low melting point conductive material covers the outer conductor and the conductor surface around the escape groove;

When the low-melting point conductive material is melted, the action of the power body causes the outer conductor passing through the escape groove to move to the position not covered with the conductor to achieve tripping.

Further, the conductor is a rotatable structure, the power body is a torsion spring structure arranged on the rotating installation position of the conductor, and the power body continuously imparts torsion force to the conductor toward the tripping direction.

Further, the power body includes a main body and a spring arranged in the main body, and the spring is compressed between the main body and the fixing structure when the electrical conductor is fixed to the outer conductor by a low-melting conductive material.

Further, the conductor is a metal sheet bending structure, the conductor is provided with a through slot for placing the power body, and the end of the through slot away from the rotating shaft is an inclined surface that fits and drives with the power body.

Further, it also includes a feedback component, and the feedback component has a built-in power source;

The feedback component has a movement trend through the power source, and is connected with the power body to limit the position;

When the power body acts, the feedback component acts synchronously and externally feeds back the failure information of the thermal tripping structure through the change of the external identification.

Further, the feedback assembly includes a rotatable feedback body and a helical torsion spring arranged in the feedback body;

The feedback body is provided with a soft connection structure connected with the power body.

Further, the soft connection structure is a connection belt, and one end of the connection belt is provided with an enlarged end, which is clamped and limited by the clamping groove provided on the feedback body and partially wound around the outside of the feedback body;

A pull hole is provided on the side away from the enlarged end, one end of the power body extends out of the conductor, and a pull hook matched with the pull hole is arranged at the end of the power body.

A surge protector is provided with the above-mentioned thermal tripping structure inside, including a casing as a fixed structure, the casing is provided with a varistor, and the access end of the varistor is connected to an external circuit, and the pressure The outgoing end of the varistor is connected to the incoming end of the conductor through low-temperature soldering, and the outgoing end of the conductor is connected to the external circuit.

The beneficial effects of the present invention are:

(1) In the present invention, a spring with a certain length is used to compress to form a power reserve, but through the design of the inclined surface structure, the originally large elastic force can be reduced in the form of the inclined surface component force, and it can also be arranged inside the conductor and push it outwards Rotation, so as to achieve better breaking effect;

(2) In the present invention, a spring with a certain compression or tension length is used to provide thrust to the power body, and in order to ensure a better breaking effect, the change in the spring thrust when the power body is moving needs to be small, so the initial stage of the spring thrust larger. Through the fit of the inclined surface and the wedge surface, the thrust of the spring does not directly act on the conductor to make it rotate, but reduces the thrust through a certain angle of component force, and at the same time can satisfy the rotation direction of the conductor.

Description of drawings

Fig. 1 is the structural schematic diagram of one side of the surge protector in Embodiment 5 and Embodiment 6 of the present invention, wherein the thermal tripping structure is arranged on the side of the varistor;

Fig. 2 is the axial side schematic diagram of another angle of Fig. 1 of the present invention;

3 is a schematic diagram of a thermal tripping structure with a varistor in Embodiment 5 and Embodiment 6 of the present invention, wherein a linked feedback body is also shown;

Fig. 4 is another perspective view of Fig. 3 of the present invention;

Fig. 5 is the enlarged schematic diagram of part A in Fig. 4 of the present invention;

Fig. 6 is the display diagram A of the present invention splitting the conductor and the power body separately;

Fig. 7 is another side angle display view of Fig. 6 in the present invention;

Fig. 8 is a structural representation diagram of a single power body in the present invention;

9 is a schematic structural diagram of a state in which a power body pushes an electrical conductor to rotate outward in the present invention;

FIG. 10 is a schematic structural diagram of a side with an SCB module according to Embodiment 6 of the present invention.

In the picture: 1- Power body, 2- Conductor, 3- Feedback body, 4- Helical torsion spring, 5- Connecting belt, 6- Clamp groove, 7- Pull hole, 8- Pull hook, 9- Shell, 10- Varistor.

Detailed ways

The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of the present application, but not all of the embodiments. The components of the embodiments of the present application generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

Thus, the following detailed description of the embodiments of the application provided in the accompanying drawings is not intended to limit the scope of the application as claimed, but is merely representative of selected embodiments of the application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In the description of this application, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" appear ” and other indications are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of the application is usually placed in use, and are only for the convenience of describing the application and simplifying the description, rather than indicating Or imply that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as a limitation of the present application. In addition, if the terms "first", "second" and the like appear in the description of the present application, they are only used to distinguish the description, and should not be understood as indicating or implying relative importance.

Furthermore, the appearance of the terms "horizontal", "vertical" and the like in the description of the present application does not mean that the component is required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal than "vertical", it does not mean that the structure must be completely horizontal, but can be slightly inclined.

In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "arranged", "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed The connection can also be a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood in specific situations.

Example 1:

A thermal tripping structure includes a power body 1 and a conductor 2. The conductor 2 is a conductor structure including an access end and an outlet end. The power body 1 arranged inside the conductor 2 makes the conductor 2 have The movement trend of leaving the circuit; at least one end of the incoming end and the outgoing end of the conductor 2 is connected to the outer conductor through a low melting point conductive material, and the low melting point conductive material loses the restriction on the conductor 2 after being melted by heat.

In the existing thermal trip structure, in order to achieve the instant breaking effect, it is usually arranged close to the functional component, so that the thermal signal can quickly reach the receiving structure. The so-called heat signal is the way of heat conduction through the medium, which causes the temperature of the receiving structure to rise. Due to the change of temperature, the physical form of the special material will change. For example, the low melting point conductive material in the present invention, the conductor 2 and the The outer conductor is attached and fixed. If the temperature rises to the melting point, the structure melts and falls off, so that the structure on the side that originally had a tendency to break away returns to its original position, so as to achieve the purpose of tripping.

Specifically, in this embodiment, both the power body 1 and the conductor 2 are connected to the same fixed structure, the conductor 2 is rotatably connected to the fixed structure, and the power body 1 is movably connected to the fixed structure and can be along a straight line Movement; the movement direction of the power body 1 is perpendicular to the rotation axis of the conductor 2, and one end of the power body 1 is attached to the end of the conductor 2 away from the rotation axis, and the space between the end face and the movement direction of the power body 1 The included angle is an acute angle.

The power body 1 is a structure arranged in the conductor 2 to operate, and since the power body 1 can always give a certain power in the normal state of the conductor 2, the power body 1 and the conductor 2 are always connected or attached to each other. state. The power body 1 provides the motive force through the internal structure. If a force is needed to push the conductor 2 to move, its end away from the contact with the conductor 2 is fixed on another structure, so as to push the conductor 2 to move relative to the structure.

On the other hand, the conductor 2 has more movement modes, and the rotation mode has less displacement. Since the conductor 2 is provided with an incoming end and an outgoing end, which are respectively connected to the external conductor to form a series circuit, if the conductor 2 is displaced, the best solution is to pass the low melting point between the incoming end or the outgoing end and the external conductor through a low melting point. The material is welded, and the other end is connected by a soft or a structure that can simultaneously generate displacement and maintain an electrical connection.

In this solution, since the electrical conductor 2 is rotatably connected with the fixed structure, and the rotating connection part is provided with a rotating shaft, the displacement of the part close to the rotating shaft when the electrical conductor 2 moves is the smallest, and the part is connected with the soft conductive material through the soft conductive material. External conductor connection. The displacement of one end away from the rotating shaft is the largest, and this part is welded to the outer conductor through a low-melting-point conductive material. This solution can not only ensure a stable tripping effect, and the distance between the two ends connected by the low-melting conductive material after the conductor 2 is rotated outwards is larger; On the premise that displacement produces resistance, less soft materials are used and the cost is lower.

It is worth noting that, in order to achieve an efficient tripping effect in a small space, the power body 1 needs to maintain a relatively stable thrust within a certain displacement range. Then, the compressed elastic body material is built in as the motive force, and the elastic force of the dynamic body 1 is less attenuated when it moves by setting a suitable length.

However, since the conductor 2 is set in rotation, the contact surface between the power body 1 and the conductor 2 in linear motion is an inclined plane to achieve effective transmission. Compared with the prior art, since the power body 1 is accommodated in the conductor 2, and the power body 1 is set in a linear motion mode, the structure of the inclined plane makes the conductor 2 receive the force within the displacement range of the power body 1. The thrust component force is relatively uniform, and by setting an appropriate angle, the thrust component force can be satisfied without causing a false break when breaking. If the angle is greater than 90 degrees, even if the low-melting point conductive material on the conductor 2 side is melted, the power body 1 cannot operate.

Example 2:

This embodiment also discloses a thermal tripping structure, which specifically includes a power body 1 and a conductor 2. The conductor 2 is a conductor structure including an access end and an outlet end. The conductor 2 has a tendency to move away from the circuit; one end of the access end of the conductor 2 is connected to the outer conductor through a low melting point conductive material, and the low melting point conductive material loses its restriction on the conductor 2 after being melted by heat.

Both the power body 1 and the conductor 2 are connected to the same fixed structure, the conductor 2 is rotatably connected to the fixed structure, and the power body 1 is movably connected to the fixed structure and can move along a straight line; the movement direction of the power body 1 is the same as that of the conductor 2 The rotation axis is vertical, and one end of the power body 1 is attached to the end of the conductor 2 away from the rotation axis, and the spatial angle between the attached end surface and the movement direction of the power body 1 is an acute angle.

The conductor 2 is covered on the power body 1, and an escape groove is provided on the power body 1 for any external conductor to pass through, and the low melting point conductive material covers the outer conductor and the surface of the conductor 2 around the escape groove;

When the low melting point conductive material is melted, the action of the power body 1 causes the outer conductor passing through the escape groove to move to the position where the conductor 2 is not covered to achieve tripping.

Example 3:

This embodiment is optimized and limited on the basis of the above-mentioned Embodiment 1. The conductor 2 is a rotatable structure, the power body 1 is a torsion spring structure arranged on the rotating installation position of the conductor 2, and the power body 1 continues to provide electrical conduction. Torsional force of body 2 in the direction of tripping.

The power body 1 includes a main body and a spring arranged in the main body. When the electrical conductor 2 is fixed to the outer conductor by a low-melting conductive material, the spring is compressed between the main body and the fixing structure.

The conductor 2 is a metal sheet bending structure. The conductor 2 is provided with a through slot for placing the power body 1 , and the end of the through slot away from the rotating shaft is an inclined surface that fits with the power body 1 for transmission.

The thermal tripping structure in this embodiment further includes a feedback component, and the feedback component has a built-in power source; the feedback component has a movement tendency through the power source, and is connected to the power body 1 to limit the position; when the power body 1 moves, the feedback component Synchronous action and external feedback of thermal trip structure failure information through external identification changes.

The feedback assembly includes a rotatable feedback body 3 and a helical torsion spring 4 arranged in the feedback body 3 ; the feedback body 3 is provided with a soft connection structure connected with the power body 1 .

The soft connecting structure is a connecting belt 5, and one end of the connecting belt 5 is provided with an enlarged end, which is clamped and limited by the clamping groove 6 provided on the feedback body 3 and partially wound around the outside of the feedback body 3;

A pull hole 7 is provided on the side away from the enlarged end. One end of the power body 1 extends out of the conductor 2 and a pull hook 8 matched with the pull hole 7 is provided at the end of the power body 1 .

Example 4:

This embodiment discloses a surge protector with a thermal trip structure inside, including a housing 9 as a fixed structure, and a varistor 10 is arranged in the housing 9, and the connection of the varistor 10 is The input end is connected to the external circuit, the connection end of the varistor 10 is connected to the connection end of the conductor 2 through low temperature soldering, and the connection end of the conductor 2 is connected to the external circuit.

The thermal tripping structure includes a conductor 2 that is electrically connected to the terminal of the varistor 10 through a low melting point material. The conductor 2 is provided with a power body 1 that continuously drives the conductor 2 to move toward the tripping direction. .

The thermal tripping structure adopts linear sliding action to trip. The power body 1 includes a main body of a strip-shaped structure, and the main body is slidably connected to the housing 9 through a connecting rod.

A spring is sleeved on the connecting rod, and there is a certain distance between the main body and the bottom frame when the spring is reset. The end of the main body is provided with a conductor 2, and the conductor 2 is a metal sheet structure fixed to the end of the main body made of insulating material by bolts. On the other hand, one side of the conductor 2 and the outgoing corner protruding from the varistor 10 are in a fixed connection state through low-temperature soldering. The conductor 2 is also provided with a soft and bent metal wire, and is connected to the outgoing terminal of the surge protector through the metal wire.

When the conductor 2 and the outlet angle of the varistor 10 are fixedly connected, the main body of the power body 1 is compressed to a state of being in contact with the chassis. At this time, the spring always gives the main body an elastic force to disconnect from the connection after being compressed. The low temperature solder joint is limited and thus is in a stable state.

When the varistor 10 is abnormally overheated, the temperature is transferred to the low-temperature solder connection and melted, the conductor 2 is disconnected from the varistor 10, and the power body 1 pushes the conductor 2 to move outward, so that the An open circuit is formed in the entire surge protector, so as to achieve the effect of protecting the access circuit.

Example 5:

This embodiment discloses a surge protector, as shown in Figures 1-9, with a thermal trip structure inside, including a housing 9 as a fixed structure, and a varistor 10 is arranged in the housing 9, The access terminal of the varistor 10 is connected to an external circuit, the terminal of the varistor 10 is connected to the access terminal of the conductor 2 through low-temperature soldering, and the terminal of the conductor 2 is connected to the external circuit. circuit connection.

The thermal tripping structure includes a conductor 2 that is electrically connected to the terminal of the varistor 10 through a low melting point material. The conductor 2 is provided with a power body 1 that continuously drives the conductor 2 to move toward the tripping direction. .

The conductor 2 is a rotatable structure, and the power body 1 is a torsion spring structure disposed on the rotating installation position of the conductor 2. The power body 1 continuously imparts a torsional force to the conductor 2 toward the tripping direction. The power body 1 includes a main body and a spring arranged in the main body. When the electrical conductor 2 is fixed to the outer conductor by a low-melting conductive material, the spring is compressed between the main body and the fixing structure.

The conductor 2 is a metal sheet bending structure. The conductor 2 is provided with a through slot for placing the power body 1 , and the end of the through slot away from the rotating shaft is an inclined surface that fits with the power body 1 for transmission.

The thermal tripping structure in this embodiment further includes a feedback component, and the feedback component has a built-in power source; the feedback component has a movement tendency through the power source, and is connected to the power body 1 to limit the position; when the power body 1 moves, the feedback component Synchronous action and external feedback of thermal trip structure failure information through external identification changes. The feedback assembly includes a rotatable feedback body 3 and a helical torsion spring 4 arranged in the feedback body 3 ; the feedback body 3 is provided with a soft connection structure connected with the power body 1 .

The soft connecting structure is a connecting belt 5, and one end of the connecting belt 5 is provided with an enlarged end, which is clamped and limited by the clamping groove 6 provided on the feedback body 3 and partially wrapped around the outside of the feedback body 3; A pull hole 7 is provided on one side, one end of the power body 1 extends out of the conductor 2 and a pull hook 8 matched with the pull hole 7 is provided at the end of the power body 1 .

Example 6:

This embodiment discloses a highly integrated circuit protection device, as shown in FIG. 1-10 , which is specifically a pluggable module integrating an SPD module and an SCB module. The so-called plug-in structure includes two plug-in parts: a base and a plug-in box, and the base is a concave-shaped structure with terminals on both sides for connecting to a circuit. The middle groove is provided with two metal pin sockets, and also provided with a plurality of sockets for accommodating the anti-reverse insertion structure.

The plug-in box is a cuboid structure with two metal feet and two anti-reverse plugs at the bottom. A complete circuit protection device is formed by inserting the plug-in box into the groove of the base, and the detachable structure design is convenient for wear parts. Replacement for improved ease of use.

The plug-in box mainly includes a casing 9 and a fixing frame, and one side of the casing 9 is opened to facilitate the insertion of the fixing frame. The bottom of the fixing frame is provided with a bottom plate that covers and seals the opening of the casing 9 . The internal space of the plug-in box is divided into two chambers by the fixing frame, and one side of the chamber is provided with an SCB module, and the other side is provided with an SPD module. The two metal feet on the plug-in box are divided into an access end and an output end. The metal feet of the access end extend into the plug-in box and connect with the SCB module, while the metal feet of the outlet end extend into the plug-in box and connect with the SPD module. , the SCB module and the SPD module are connected in series to form a complete channel.

Among them, the SCB module on one side includes an air release pipe, an electromagnetic release, a switch assembly, a handle and a control circuit board, and the inner wall of the fixing frame on the side is provided with a cylindrical installation position for installing the air release pipe and a Rectangular mounting position for installing the electromagnetic release. The gas release pipe is a cylindrical structure, and metal electrode disks are provided on both of its circular sides. In the figure, one side of the metal electrode plate is set inward, and the inner metal electrode plate is electrically connected to the metal feet of the access end, and the inner metal electrode plate is connected to the electromagnetic coil of the electromagnetic release through a wire.

The metal electrode disk on the outside of the gas release tube is also connected to the other end of the electromagnetic coil through a wire, so that the gas release tube and the electromagnetic coil are connected in parallel. A static contact (4.5) is also provided on the outer metal electrode disk, and the static contact is connected with the switch assembly in a closed state.

The switch assembly includes an active rod, a push rod and a connecting rod, wherein the active rod is provided with a bar-shaped through hole, and the inner wall of the fixing frame is provided with a rotating shaft penetrating the bar-shaped through hole. The active rod can not only rotate around the rotating shaft, but also can slide along the extending direction of the bar-shaped through hole with the rotating shaft as a fixed point, so as to achieve the effect of changing the locked state and disengaged from the locked state by position adjustment. Since the switch assembly is divided into locked and disengaged states during operation, when it is in contact with the stationary contact, a limit is formed by locking the components, so that the connection can be maintained in a steady state without the influence of external force. Once the locked state is damaged by external force, it will be pulled to one side by the rebound structure provided inside.

The upper end of the active rod is clamped with the connecting rod, and the other end of the connecting rod is connected with the handle. The action of the active rod is controlled by turning the handle. At the same time, the electromagnetic release acts when a continuous power frequency current occurs in the access line and makes the interior movable. The armature moves outward and pushes the push rod to rotate, and the push rod pushes the active rod to move toward the disconnecting direction.

The active rod is provided with a movable contact at one end away from the upper connecting rod, and the movable contact is a metal sheet structure. A plurality of through holes are arranged on the side fixing frame, and a through hole for the SPD access end to pass through is arranged on the side close to the active rod. At this time, the connection between the movable contact and the SPD module is connected by a soft metal conductor. The input ends form a series connection.

The SPD module is the varistor 10 . The side fixing frame is provided with an installation position for fixing the varistor 10 . The installation position is a thin-walled structure with annular protrusions. Press the varistor 10 and pull the button. The larger surfaces on both sides of the varistor 10 are individually provided with metal rings for connecting to external circuits.

The inner metal ring is provided with an access end which passes through the fixing frame and is connected with the movable contact, and the outer metal ring is provided with an outlet end which penetrates the thin-walled structure of the mounting seat. A thermal tripping structure and a feedback component are also provided on the fixing frame on this side. The feedback component is a cylindrical rotatable structure with a torsion spring for providing resilience, which is arranged on the top and close to the window position.

The thermal tripping structure includes an electrical conductor 2 and a power body 1, wherein one end of the power body 1 is hinged to the fixing frame, and the other end is connected to the feedback component through a belt-shaped connector. The conductor 2 and the terminal of the metal ring are fixedly connected by low-temperature soldering. Once the varistor 10 is abnormally heated, causing the low-temperature soldering part to melt, the power body 1 is pushed upward by the internal spring, pushing the conductor 2 to separate from the varistor 10, and at the same time loses the pulling force limiting the feedback component, and the feedback component rotates. The external viewing window can see the color change of the feedback component, so as to know that the internal thermal trip structure has acted and needs to be replaced in time.

The bottom of the thermal tripping structure is connected to the metal feet of the outgoing end through the soft conductor 2, so that the entire device forms a complete loop.

Different from the existing switch assemblies, by simplifying the components, the space occupancy rate can be reduced as much as possible on the premise of retaining its stable tripping function, and the operation stability can be improved by reducing the number of components, and the manufacturing cost can be reduced.

The active rod is a rod structure with a certain length, a strip-shaped through hole is arranged in the middle to facilitate the rotation of the rotating shaft of the fixing frame to pass through, and a displacement hole is also opened in the middle position, and the displacement hole is connected with the first A tension spring to provide the tripping restoring force.

The present invention is not limited to the above-mentioned optional embodiments, and anyone can derive other various forms of products under the inspiration of the present invention. The above specific embodiments should not be construed as limiting the protection scope of the present invention, which should be defined in the claims, and the description can be used to interpret the claims.

Claims (10)

1. a thermal tripping structure, after receiving an abnormal temperature rise signal, actuate a circuit breaker protection circuit in time, comprising a power body (1) and an electrical conductor (2), characterized in that: The electrical conductor (2) is a conductor structure including an access terminal and an outlet terminal, and the electrical conductor (2) has a tendency to move away from the circuit through the dynamic body (1) arranged inside the electrical conductor (2); At least one end of the incoming end and the outgoing end of the conductor (2) is connected to the outer conductor through a low melting point conductive material, and the low melting point conductive material loses restraint on the conductor (2) after being melted by heat. 2 . The thermal tripping structure according to claim 1 , wherein the power body ( 1 ) and the electrical conductor ( 2 ) are both connected to the same fixed structure, and the electrical conductor ( 2 ) is connected to the fixed structure. 3 . The structure is rotationally connected, and the power body (1) is movably connected with the fixed structure and can move along a straight line; The moving direction of the power body (1) is perpendicular to the rotation axis of the conductor (2), and one end of the power body (1) is attached to the end of the conductor (2) away from the rotation axis, and the end face of the power body is attached to the power body (1) The spatial angle of the movement direction is an acute angle. 3. A thermal tripping structure according to claim 1, characterized in that: the electrical conductor (2) is covered on the power body (1), and an escape groove is provided on the power body (1) for Any outer conductor passes through, and the low melting point conductive material covers the outer conductor and the surface of the conductor (2) around the escape groove; When the low-melting point conductive material is melted, the action of the power body (1) causes the outer conductor passing through the escape groove to move to the position not covered with the conductor (2) to realize tripping. 4 . The thermal tripping structure according to claim 1 , wherein the electrical conductor ( 2 ) is a rotatable structure, and the power body ( 1 ) is arranged at the rotational installation position of the electrical conductor ( 2 ). 5 . On the torsion spring structure, the power body (1) continuously gives the conductor (2) a torsion force in the direction of tripping. 5. A thermal tripping structure according to claim 2, characterized in that: the power body (1) comprises a main body (1.1) and a spring (1.2) arranged in the main body (1.1), the electrical conductor (2) The spring (1.2) is compressed between the main body (1.1) and the fixing structure when the low-melting point conductive material is fixed to the outer conductor. 6. A thermal tripping structure according to claim 2, characterized in that: the electrical conductor (2) is a metal sheet bending structure, and the electrical conductor (2) is provided with a place for placing the power body (1). The through groove (2.1), at one end of the through groove (2.1) away from the rotating shaft, is an inclined surface that fits with the power body (1) for transmission. 7. A thermal tripping structure according to any one of claims 1-6, characterized in that: it further comprises a feedback component, and the feedback component has a built-in power source; The feedback component has a movement tendency through the power source, and is connected with the power body (1) to limit the position; When the power body (1) acts, the feedback component acts synchronously and externally feeds back the failure information of the thermal tripping structure through the change of the external identification. 8. A thermal tripping structure according to claim 7, characterized in that: the feedback assembly comprises a rotatable feedback body (3) and a helical torsion spring (4) arranged in the feedback body (3); The feedback body (3) is provided with a soft connection structure connected with the power body (1). 9 . The thermal tripping structure according to claim 8 , wherein the soft connecting structure is a connecting belt ( 5 ), and one end of the connecting belt ( 5 ) is provided with an enlarged end, and through the feedback The clamping groove (6) provided on the body (3) is clamped to the limit and partially wound around the outside of the feedback body (3); A pull hole (7) is provided on the side away from the enlarged end, and one end of the power body (1) extends out of the conductor (2) and is provided with a pull hook (8) matched with the pull hole (7) at its end. 10. A surge protector, characterized in that: the thermal tripping structure described in claim 7 is provided inside, including a casing (9) as a fixed structure, and a pressure A varistor (10), an access end of the varistor (10) is connected to an external circuit, and an outlet end of the varistor (10) is connected to the access end of the conductor (2) through low-temperature soldering , the connecting end of the conductor (2) is connected to the external circuit.

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