Circuit cut-off device

Abstract

The circuit cut-off device comprises a shell, a conductive wire, an energy storage element, a cut-off piece and a conducting bar, the conducting bar is arranged on the shell in a penetrating mode, the conducting bar located in the shell is provided with a weak cut-off position, the cut-off piece is located in the shell and corresponds to the weak cut-off position, and the conductive wire is fixed in the shell to support the cut-off piece. The energy storage element is located in the shell and acts on the cut-off piece in an energy storage state, and the conductive wire and the energy storage element are matched to limit the initial position of the cut-off piece. The two ends of the conductive wire can receive a trigger signal to generate heat and reduce the mechanical strength of the conductive wire, so that the energy storage element releases stored energy, the cut-off piece is driven to move towards the weak cut-off position, and a circuit where the conductive bar is located is cut off from the weak cut-off position. According to the invention, the conductive wire is matched with the energy storage element to drive the cut-off piece to disconnect the conducting bar, the impact force on the shell is small, the strength requirement of the shell is reduced, and meanwhile, the product volume is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the electrical field, especially to a circuit breaking device. BACKGROUND

[0002] The protection device for circuit breaking is fuse, at present, the fuse is mainly divided into two types, one is traditional thermal melting fuse, the main structure is shell, arc extinguishing medium and fuse, the fuse is connected in series in the circuit, when the fault current, the fuse is melted and then the circuit is cut off. The melting process of the fuse of the traditional fuse is relatively slow, and the response time is long.

[0003] The other is the excitation fuse which is disconnected by mechanical method, the main structure is shell, electronic ignition device (gas generating device), piston and conductive row, the conductive row is connected in series in the circuit, when the fault current or other faults need to forcibly disconnect the circuit, the electronic ignition device acts according to the received trigger signal, releases high pressure gas, and the high pressure gas drives the piston to cut off the conductive row, so as to cut off the circuit. Compared with the traditional fuse, the excitation fuse has short response time, and can actively or passively send the trigger signal to the electronic ignition device to act when the fault current or the circuit needs to be forcibly cut off. However, the electronic ignition device of the excitation fuse needs to generate high pressure gas instantaneously, and has very high strength requirement for the shell and some parts in the shell, and has high assembly precision requirement for the shell, and has large volume. SUMMARY

[0004] The purpose of the present application is to provide a circuit breaking device, which adopts the conductive wire capable of reducing strength when the temperature rises and the energy storage element, realizes the mechanical disconnection of the conductive row, avoids the use of high pressure gas as driving force, and therefore reduces the strength requirement of the shell and the volume of the product.

[0005] In order to achieve the above purpose, the technical scheme of the present application is a circuit breaking device, which comprises a shell, a conductive wire, an energy storage element, a cutting member and a conductive row, the conductive row is arranged in the shell, the conductive row in the shell is provided with a disconnection weak part, the cutting member is arranged in the shell corresponding to the disconnection weak part, the conductive wire is fixed in the shell and supports the cutting member, the energy storage element is arranged in the shell and acts on the cutting member in the energy storage state, and the conductive wire cooperates with the energy storage element to limit the initial position of the cutting member; the two ends of the conductive wire can receive the trigger signal, heat and reduce the mechanical strength of the conductive wire, so that the energy storage element releases the stored energy, drives the cutting member to displace towards the disconnection weak part, and cuts off the circuit in which the conductive row is located.

[0006] Preferably, the conductive row comprises a first conductive row and a second conductive row, which are arranged in the shell, one end of the first and second conductive row is located outside the shell, the other end is located inside the shell and is conductively connected through a breaking weak part.

[0007] Preferably, the breaking weak part is integrally connected with the first and second conductive bodies, and the breaking weak part is a thickness-reduced structure in the direction of movement of the cutting member relative to the first and second conductive rows; or the breaking weak part is an elastic member, which elastically abuts between the first and second conductive rows, and the elastic member is in conductive contact with the first and second conductive rows, respectively.

[0008] Preferably, the conductive wire is made of metal wire or carbon fiber.

[0009] Preferably, the energy storage element is an energy storage spring.

[0010] Preferably, the energy storage spring is one of a tensile spring, a compression spring and a torsion spring.

[0011] Preferably, one end of the energy storage element is connected to the end of the cutting member away from the conductive row, and the other end is connected to the shell or the conductive row.

[0012] Preferably, when the energy storage element is a compression spring, the end of the cutting member away from the conductive row and the end face of the shell opposite to it are respectively provided with accommodating grooves, and the two ends of the compression spring are connected in the accommodating grooves of the cutting member and the shell, and the compression spring is in a compressed state.

[0013] Preferably, when the energy storage element is a tensile spring, one end of the tensile spring is connected to the end of the cutting member away from the conductive row, and the other end is connected to the conductive row or the end of the shell away from the cutting member, and the tensile spring is in a stretched state.

[0014] Preferably, when the energy storage element is a torsion spring, one end of the torsion spring is connected to the end of the cutting member away from the conductive row, and the other end is connected to the shell on one side of the cutting member, and the torsion spring acts on the cutting member in an energy storage state.

[0015] Preferably, the conductive wire is in a U-shaped structure, and both ends of the conductive wire are fixed on the shell; the conductive wire passes through or hangs on the end of the cutting member away from the conductive row in a U-shaped structure.

[0016] Preferably, when the conductive wire passes through the cutting member, the conductive wire passes through the end of the cutting member away from the conductive row in a circular arc shape.

[0017] The application adopts the cooperation of the conductive wire and the energy storage element. When the fault current is generated or the unexpected situation occurs and the circuit needs to be cut off, the voltage signal is applied to the two ends of the conductive wire as a trigger signal, the conductive wire is heated and softened or fused, and the driving force of the energy storage element applied to the cutting member accelerates the breaking of the conductive wire during the softening or fusing of the conductive wire, the limiting of the limiting member is released, the energy storage element drives the displacement of the cutting member, the conductive row is cut off from the weak breaking position of the conductive row, and thus the circuit is cut off. When the weak breaking position of the conductive row is the elastic member, the cutting member drives the elastic member to be separated from the conductive contact with the first conductive row and the second conductive row, and to be away from the first conductive row and the second conductive row, and the circuit is cut off.

[0018] The conductive wire and the energy storage element of the application are cooperated, the impact force caused by the release of high-pressure gas in the shell is avoided, and the mechanical strength requirement of the shell material and the assembly precision of the shell are reduced. The application has simple structure, small space occupation, reduced product volume, and is easy to process and miniaturize. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic diagram of the application.

[0020] Figure 2 is a three-dimensional sectional structural schematic diagram of the application.

[0021] Figure 3 is a structural schematic diagram when the energy storage element is a tension spring.

[0022] Figure 4 is a structural schematic diagram when the energy storage element is a torsion spring.

[0023] REFERENCE NUMERALS:

[0024] 1. conductive wire, 2. first shell, 3. energy storage element, 4. second shell, 5. cutting member, 6. first conductive row, 7. elastic member, 8. second conductive row. DETAILED DESCRIPTION

[0025] The circuit cutting device of the application comprises a shell, a conductive wire, an energy storage element, a cutting member and a conductive row. The conductive row is arranged on the shell, the conductive row in the shell is provided with a breaking weak position, the cutting member is arranged in the shell corresponding to the breaking weak position, the conductive wire is fixed in the shell to support the cutting member, the energy storage element is arranged in the shell to act on the cutting member in an energy storage state, and the conductive wire and the energy storage element cooperate to limit the initial position of the cutting member. The two ends of the conductive wire can receive a trigger signal to heat and reduce the mechanical strength of the conductive wire, release the energy storage of the energy storage element, drive the displacement of the cutting member towards the breaking weak position, and cut off the circuit of the conductive row.

[0026] The energy storage element is a spring capable of storing energy, which can be a compression spring, a tension spring, a torsion spring (torsion spring), etc. The energy storage state of the compression spring is the compression state, the energy storage state of the tension spring is the tension state, and the energy storage state of the torsion spring is the torsion state. The elastic force or torque generated by the different energy storage states of the different springs is applied to the cutting member as a driving force to drive the displacement of the cutting member.

[0027] The preferred embodiments are described below in detail with reference to the drawings. The orientation-related terms are only based on the orientation shown in the drawings and do not constitute a limitation on the technical solutions of the present application.

[0028] The circuit cutting device of the present application, referring to Figure 1 , comprises a first housing 2 and a second housing 4, the first housing 2 is arranged at the open end of the second housing 4 to form a housing. The first housing 2 seals the open end of the second housing 4 to form a hollow cavity in the housing. The housing structure is not limited to Figure 1 The housing structure can have various forms according to design needs.

[0029] The conductive row includes a first conductive row 6 and a second conductive row 8. The first conductive row 6 and the second conductive row 8 are respectively arranged on the second housing 4, one end of the first conductive row 6 and the second conductive row 8 is located outside the housing as a connection end of the circuit cutting device, and the other end passes through the shell wall of the second housing 4 and is located in the cavity in the housing. The first conductive row 6 and the second conductive row 8 in the housing are conductively connected through the breaking weak part, so that the first conductive row 6 and the second conductive row 8 are conductive. The breaking weak part can be an integral structure integrally connected with the first conductive row 6 and the second conductive row 8, or an independent breaking weak part arranged between the first conductive row 6 and the second conductive row 8.

[0030] When the breaking weak part is integrally connected with the first conductive row 6 and the second conductive row 8 in an integral structure, the breaking weak part is a thickness reduction structure or a width reduction structure. The thickness reduction structure is that the thickness of the breaking weak part is thinner than the thickness of the first conductive row 6 and the second conductive row 8 along the displacement direction of the cutting member, thereby forming a thickness reduction structure, such as a groove structure arranged on one side and the two sides of the conductive row, the groove structure can be a U-shaped groove structure, a V-shaped groove structure, and the thickness of the conductive row is reduced through the groove structure to form the breaking weak part. The width reduction structure is a structure that narrows the width of the conductive row as the breaking weak part.

[0031] The breaking weak part is an independent component, which is arranged between the first conductive row 6 and the second conductive row 8, referring to Figures 1 to 4, a gap is reserved between the first conductive row 6 and the second conductive row 8 in the shell, and an elastic member 7 is arranged in the gap as a breaking weak point. The elastic member 7 is in a spherical structure, and is arranged between the first conductive row 6 and the second conductive row 8 in an elastic contact mode. The elastic member 7 is arranged between the first conductive row 6 and the second conductive row 8 and kept in position by the elastic force generated when the elastic member 7 is in contact, so that the first conductive row 6 and the second conductive row 8 are electrically connected. The spherical structure of the elastic member 7 has a relatively small contact area with the first conductive row 6 and the second conductive row 8, and a relatively small friction force, so that the elastic member 7 can be separated from the first conductive row 6 and the second conductive row 8 by using a small driving force to cut off the circuit in which the conductive row is arranged. When the elastic member is arranged between the first conductive row and the second conductive row, the requirement for the energy storage state (the releasable driving force) of the energy storage element is relatively low, and the requirements for the materials of the conductive wire and the energy storage element are also relatively low. The shape of the elastic member 7 is not limited to the spherical structure, as long as the elastic member 7 can be in electric contact with the first conductive row and the second conductive row, can keep the initial position, and can be easily driven away from the first conductive row and the second conductive row by the cutting member.

[0032] The cutting member 5 is made of an insulating material, and in this embodiment, the cutting member 5 is in the structure of a push rod. The cutting member 5 is arranged at the breaking weak point between the first conductive row 6 and the second conductive row 8, and in this embodiment, the cutting member 5 is arranged at the elastic member 7.

[0033] The conductive wire 1 is made of a carbon fiber material, and has a wire structure, a relatively high resistance, and a certain binding force, that is, the conductive wire 1 has a certain mechanical strength. When a voltage is applied to both ends of the conductive wire 1, the conductive wire 1 is easily heated, softened, or broken. In this embodiment, the conductive wire 1 is in a U-shaped structure, and after the conductive wire 1 passes through the cutting member 5 away from the conductive row and the elastic member 7, both ends of the conductive wire 1 are fixedly arranged on the first shell 2 away from the elastic member, and both ends of the conductive wire 1 extend out of the second shell 2, so that the conductive wire 1 can be easily connected to an external trigger signal circuit when the circuit cutting device is used. The conductive wire 1 passes through the cutting member 5 away from the conductive row in a circular arc shape to support the cutting member 5, and this structure can reduce the friction between the conductive wire 1 and the cutting member 5 when the conductive wire 1 passes through the cutting member 5, and can avoid the conductive wire 1 from being abraded by the friction of the cutting member 5, thereby improving the working reliability of the conductive wire. At the same time, the U-shaped structure of the conductive wire can make the cutting member keep a balanced and stable state. The conductive wire can also be a metal wire, and the conductive wire can also be hung on the end of the cutting member away from the conductive row to support the cutting member.

[0034] The energy storage element 3 is connected at one end to the end of the cutting member 5 away from the conductive row, and is fixedly connected at the other end to the first shell 2, the second shell 4, or the conductive row. In this embodiment, the energy storage element 3 is arranged in the first shell 2. Figure 1The energy storage element 3 is a compression spring, and its energy storage state is a compressed state. The energy storage element 3 is located between the cutting member 5 and the first housing 2. Receiving grooves are respectively provided at the relative positions of the cutting member 5 and the first housing 2. The two ends of the energy storage element 3 are respectively nested in the receiving grooves starting at the relative positions of the first housing 2 and the cutting member 5. The initial position of the cutting member 5 is defined by the energy storage element 3 and the conductive wire 1. In the initial state, the energy storage element 3 is in the energy storage state. The conductive wire 1 binds the cutting member 5, keeping the energy storage element 3 in the energy storage state, and the energy storage element 3 provides driving force to the cutting member 5.

[0035] In other embodiments, the energy storage element 3 can be a tension spring or a torsion spring, i.e., a torsion spring, such as... Figure 3 and Figure 4 As shown, under the action of the energy storage element, the cutting element 5 is in an energy storage state under the constraint of the conductive wire.

[0036] When the circuit disconnection device is connected in series in the circuit, when a fault current is generated or an unexpected situation occurs that requires the circuit to be disconnected, the trigger signal circuit located outside the circuit disconnection device is turned on to apply a voltage signal to both ends of the conductive wire 1 as a trigger signal. The conductive wire 1 heats up and softens or melts as the temperature rises. During the process of the conductive wire 1 softening or even melting, the strength of the conductive wire 1 gradually decreases until the driving force of the energy storage element 3 on the cutting element 5 is greater than the binding force of the conductive wire 1 on the cutting element 5. The conductive wire 1 disconnects and releases the binding limit on the cutting element 5. The energy storage element 3 drives the cutting element 5 to move towards the elastic element 7 under the driving force of the elastic force, driving the elastic element 7 to disengage from the conductive contact with the first conductive busbar 6 and the second conductive busbar 8, so that the first conductive busbar 6 and the second conductive busbar 8 are disconnected, thereby disconnecting the circuit.

[0037] In other embodiments, when the energy storage element 3 is an energy storage spring, the energy storage spring can be a tension spring. (Change) Figure 1 One end of the energy storage spring 3 is positioned such that it is connected to the first conductive busbar 6 and the second conductive busbar 8, or to the second housing 4. The other end of the energy storage spring 3 is connected to the end of the cut-off piece 5 furthest from the conductive busbar. The energy storage spring 3 is a tension spring, and its energy storage state is a tensioned state. (See reference...) Figure 3 Energy storage springs 3 are fixedly connected to the first conductive busbar 6 and the second conductive busbar 8, respectively. The other end of the energy storage springs 3 is fixedly connected to the cutting element 5. The two energy storage springs 3 are located on opposite outer sides of the conductive wire 1, so that the energy storage springs 3 do not affect the displacement of the cutting element 5. Figure 3 In the process, the energy storage spring 3 is in a stretched state, and the conductive wire 1 provides support for the cutting element 5 and defines its initial position. When the conductive wire 1 heats up, it softens or melts as the temperature rises until it releases the constraint on the cutting element 5. Under the pull of the spring force of the spring 3, the cutting element 5 is displaced, which in turn pushes the elastic element 7 to move.

[0038] The energy storage element 3 can also be a torsion spring, i.e. a torsion spring. Referring to Figure 4 The torsion spring 3 is arranged on opposite sides of the cut-off member 5 away from the end of the conductive row, and one end of the torsion spring 3 is fixedly connected to the second housing 4, and the other end is connected to the cut-off member 5 away from the end of the conductive row. The torsion spring 3 provides a torque in the direction of the conductive row, and the torque acts on the cut-off member 5 to drive the cut-off member 5 to displace. When the conductive wire 1 generates heat, the conductive wire 1 softens or melts with the temperature rising until the cut-off member 5 is released from the restraint, and under the pull of the torque of the energy storage element 3, the cut-off member 5 displaces to push the elastic member 7 to displace.

[0039] When the conductive wire 1 generates heat to release the support and limit of the cut-off member 5, the cut-off member 5 displaces in the direction of the elastic member 7 under the energy storage effect of the energy storage element 3 to drive the elastic member 7 to disengage from the conductive contact of the first conductive row and the second conductive row.

Claims

1. A circuit interrupting device, characterized by The application relates to a safety device, which comprises a shell, a conductive wire, an energy storage element, a cutting-off piece and a conductive row, the conductive row is arranged in the shell, the conductive row in the shell is provided with a breaking weak part, the cutting-off piece is arranged in the shell and corresponds to the breaking weak part, the conductive wire is fixed in the shell and supports the cutting-off piece, the energy storage element is arranged in the shell and acts on the cutting-off piece in an energy storage state, and the conductive wire cooperates with the energy storage element to define an initial position of the cutting-off piece. Two ends of the conductive wire can receive a trigger signal to generate heat, reduce mechanical strength, release energy storage of the energy storage element, drive the cutting-off piece to move towards the breaking weak part, and cut off the circuit of the conductive row from the breaking weak part.

2. The circuit interrupting device of claim 1, wherein, The conductive row comprises a first conductive row and a second conductive row arranged in the shell, one end of the first conductive row and the second conductive row is located outside the shell, the other end is located inside the shell and is conductively connected through the breaking weak part.

3. The circuit interrupting device of claim 2, wherein, The breaking weak part is integrally connected with the first conductive body and the second conductive body, the breaking weak part is a thickness-thinning structure along the moving direction of the cutting-off piece relative to the first conductive row and the second conductive row; or the breaking weak part is an elastic piece, the elastic piece elastically abuts between the first conductive row and the second conductive row, and the elastic piece is in conductive contact with the first conductive row and the second conductive row respectively.

4. The circuit interrupting device of claim 1, wherein, The conductive wire is made of metal wire or carbon fiber.

5. The circuit interrupting device of claim 1, wherein, The energy storage element is an energy storage spring.

6. The circuit interrupting device of claim 5, wherein, The energy storage spring is one of a tensile spring, a compression spring and a torsion spring.

7. The circuit interrupting device of claim 6, wherein, One end of the energy storage element is connected with one end of the cutting-off piece away from the conductive row, and the other end is connected with the shell or the conductive row.

8. The circuit interrupting device of claim 7, wherein, When the energy storage element is a compression spring, one end of the cutting-off piece away from the conductive row and the end face of the shell opposite to the one end are respectively provided with containing grooves, the two ends of the compression spring are connected in the containing grooves of the cutting-off piece and the shell, and the compression spring is in a compressed state.

9. The circuit interrupting device of claim 7, wherein, When the energy storage element is a tensile spring, one end of the tensile spring is connected with one end of the cutting-off piece away from the conductive row, and the other end is connected with the conductive row or one end of the shell away from the cutting-off piece, and the tensile spring is in a tensile state.

10. The circuit interrupting device of claim 7, wherein, When the energy storage element is a torsion spring, one end of the torsion spring is connected with one end of the cutting-off piece away from the conductive row, and the other end is connected with the shell on one side of the cutting-off piece, and the torsion spring acts on the cutting-off piece in an energy storage state.

11. The circuit interrupting device of claim 1, wherein, The conductive wire is in a U-shaped structure, and two ends of the conductive wire are fixed on the shell; the conductive wire passes through or hangs on one end of the cutting-off piece away from the conductive row in a U-shaped structure.

12. The circuit interrupting device of claim 11, wherein, When the conductive wire passes through the cutting-off piece, the conductive wire passes through one end of the cutting-off piece away from the conductive row in a circular arc shape.

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