Dual contact excitation closer

Abstract

A double-contact excitation closer comprises a shell, a static support, a dynamic support, a piston and an electronic ignition tube arranged in the shell in sequence; the static support and the electronic ignition tube are fixedly arranged at two ends of the shell respectively, two static contacts are fixedly arranged on the static support in an insulating interval mode, and the static support and the electronic ignition tube provided with the static contacts respectively seal the two ends of the shell; the piston is arranged corresponding to the dynamic support, and a dynamic contact is arranged on the dynamic support; when the electronic ignition tube acts according to a received trigger signal, a driving force is released to drive the piston to displace, the piston drives the dynamic support with the dynamic contact to displace towards the static contact, and the static support limits the terminal position of the dynamic support after the dynamic contact is in conductive contact with the two static contacts. Through the columnar structure of the dynamic and static contacts and the lockable dynamic and static supports, the high-current and high-on capacity of the excitation closer are improved.

Description

Technical Field

[0001] This invention relates to the fields of power control and electric vehicles, and in particular to an excitation closure that can connect a backup circuit via low-voltage drive after the main circuit is disconnected due to an electrical fault. Background Technology

[0002] Currently, the protection measures for DC circuit systems (such as electric vehicles) consist of fuses and contactors. Contactors primarily handle the connection and disconnection of rated loads and currents below that, while fuses handle short-circuit currents. When a short-circuit current occurs in the main circuit, the fuse blows, permanently disconnecting the main circuit without replacing the fuse, causing inconvenience to users. Furthermore, existing circuit closers typically connect the circuit by inserting the conductive part into the break point with an interference fit, or by achieving closure through the displacement of the moving conductor and contact with the stationary conductor. Because the contact pressure is very low after the moving conductor makes conductive contact with the stationary conductor, the current-carrying capacity is weak. Alternatively, the moving conductor may contact the stationary conductor under impact, but the rebound force during contact can cause the moving conductor to bounce, or the electrostatic repulsion force may cause the moving conductor to move away from the stationary conductor, leading to poor contact. Under high current conditions, this can even result in circuit disconnection or explosion. Summary of the Invention

[0003] The purpose of this invention is to provide a dual-contact excitation closure device, in which the moving contact and the stationary contact are respectively mounted on corresponding supports, and self-locking is achieved after closing and conducting, thereby improving the contact pressure and current carrying capacity of the contacts, while preventing the moving contact from breaking off from the stationary contact under the action of electric repulsion under high current.

[0004] To achieve the above objectives, the present invention provides a dual-contact excitation closure device, comprising a housing, wherein a static support, a moving support, a piston, and an electronic ignition tube are sequentially arranged within the housing.

[0005] The stationary support and the electronic ignition tube are respectively fixedly installed at both ends of the housing. Two stationary contacts are fixedly installed on the stationary support with an insulating gap. The stationary support and the electronic ignition tube with the stationary contacts respectively seal both ends of the housing.

[0006] The piston is disposed corresponding to the movable support, and the movable contact is disposed on the movable support;

[0007] When the electronic ignition tube operates according to the received trigger signal, it releases the driving force to drive the piston to move. The piston drives the moving bracket, along with the moving contact, to move toward the stationary contact. After the moving contact makes conductive contact with the two stationary contacts, the stationary bracket defines the termination position of the moving bracket.

[0008] Preferably, the moving contact is movably mounted on the moving support.

[0009] Preferably, it further includes an insulating support member, one end of which is movably disposed on the movable support, and the other end of which is fixedly disposed with the movable contact; a contact spring is sleeved between the two ends of the insulating support member in a compressed state, and the two ends of the contact spring respectively abut against the movable support and the insulating support member.

[0010] Preferably, after the end of the insulating support member away from the static support passes through the moving support, the insulating support member is movably mounted on the moving support via a connecting rod.

[0011] Preferably, the connecting rod is a cross screw structure or a T-shaped structure, the connecting rod is located on the outer side of the end of the moving bracket, the connecting rod is threadedly connected to the insulating support, and in the initial position, the connecting rod abuts against the outer end face of the moving bracket.

[0012] Preferably, the piston abuts against the moving bracket, and a receiving groove is provided at one end of the piston facing the moving bracket, with the connecting rod located in the receiving groove of the piston; in the piston displacement direction, the connecting rod is fitted with or has a displacement space reserved between it and the receiving groove.

[0013] Preferably, the static support and the moving support are respectively cylindrical structures, with one end of the static support and the moving support being an open end and the other end being annular structures. The static contact and the insulating support head respectively pass through one end of the annular static support and the moving support.

[0014] Preferably, the end of the insulating support member connected to the moving contact is provided with at least one umbrella-shaped structure.

[0015] Preferably, when the movable support moves to the termination position, the movable support and the stationary support are locked together by a snap-fit ​​mechanism; and / or, a limiting step is provided on the outer periphery of the movable support. In the initial position, one end of the movable support abuts against / overlaps with the end of the stationary support facing the movable support. When the movable support is in the termination position, the end of the stationary support facing the movable contact abuts against the limiting step of the movable support, thereby limiting the termination position of the movable support.

[0016] Preferably, a limiting structure is provided on the outer surface of the piston, and the limiting structure is engaged with the outer shell to limit the initial position of the piston.

[0017] Preferably, one end of the two stationary contacts located outside the housing extends to form two terminals of the excitation closure.

[0018] Preferably, the excitation closure includes a fuse connected in series, and the fuse is located in the housing of the excitation closure.

[0019] Preferably, one of the conductive terminals of the fuse is electrically connected to one of the stationary contacts, and the other stationary contact and the other conductive terminal of the fuse serve as terminals for connection between the fuse-integrated excitation closure and the external connection.

[0020] The dual-contact excitation closure of the present invention adopts a columnar stationary contact and a plate-shaped moving contact. At the same time, through the locking of the moving support and the stationary support, combined with the increased elastic force of the contact spring, the moving contact and the two stationary contacts are brought into close contact, thereby increasing the contact pressure. Compared with the traditional excitation closure, it has the ability of high current carrying capacity, fast connection (i.e., high connection) and low contact resistance.

[0021] The excitation closure is used in the standby circuit and is connected in parallel with the protective fuse of the main circuit. After the fuse blows and the main circuit is disconnected, when the main circuit eliminates the abnormal situation and has the ability to conduct again, the excitation closure closes to conduct the standby circuit, so that the main circuit can be conducted, avoiding the need to replace the fuse connected in series in the main circuit.

[0022] By integrating a series-connected fuse into the excitation closure, the excitation closure itself has the ability to interrupt protection during fault current. Attached Figure Description

[0023] Figure 1 This is a circuit diagram showing the excitation closure connected in parallel in the main circuit as a backup circuit.

[0024] Figure 2 This is a circuit diagram showing a second fuse connected in series in the backup circuit.

[0025] Figure 3 This is a schematic diagram of the external structure of the excitation closure.

[0026] Figure 4 This is a schematic diagram of the excitation closure.

[0027] Figure 5 This is a structural schematic diagram of the insulating support component.

[0028] Figure label:

[0029] First fuse 100, circuit protection device 101, excitation closure device 102, second fuse 103, terminal block 104, electronic ignition tube 1, housing 2, piston 3, moving bracket 4, stationary bracket 5, stationary contact 6, moving contact 7, insulating support 8, contact spring 9, connecting rod 10, limiting step surface 401, buckle 402, snap hole 501, umbrella skirt structure 801. Detailed Implementation

[0030] The dual-contact excitation closure device of the present invention includes a housing, and a static support, a moving support, a piston, and an electronic ignition tube are sequentially arranged in the housing;

[0031] The stationary bracket and the electronic ignition tube are fixedly installed at both ends of the housing, and two stationary contacts are fixedly installed on the stationary bracket with an insulating gap. The stationary bracket with the stationary contacts and the electronic ignition tube respectively seal both ends of the housing.

[0032] The piston is positioned on the moving support, and the moving contact is mounted on the moving support.

[0033] When the electronic ignition tube acts according to the received trigger signal, it releases the driving force to drive the piston to move. The piston drives the moving bracket to move towards the stationary contact. After the moving contact makes conductive contact with the two stationary contacts, the stationary bracket defines the termination position of the moving bracket.

[0034] The following describes preferred embodiments in detail with reference to the accompanying drawings. The directional terms used are for reference only and do not constitute a limitation on the technical solutions of this invention.

[0035] The circuit diagram of the excitation closure device used in this invention is shown below. Figure 1 The first fuse 100 is connected in series with the circuit protection device 101 in the main circuit. The excitation closure 102 is connected in parallel with the first fuse 100 and in series with the circuit protection device 101. The circuit containing the excitation closure 102 is the backup circuit of the main circuit. The circuit protection device 101 is a device for circuit protection such as a contactor or circuit breaker.

[0036] Under normal operating conditions or during minor fault current, the excitation closure opens, and the current flows through the first fuse 100 and the circuit protection device 101. The main circuit is switched on and off by the closing and opening of the circuit protection device 101. When an overcurrent occurs, the first fuse 100 blows to protect the main circuit. When the fault in the main circuit is cleared, the excitation closure turns on according to the received trigger signal, and the current in the main circuit flows through the excitation closure 101 and the circuit protection device 101.

[0037] Therefore, the parallel circuit containing the excitation closure 102 serves as a backup circuit after the fuse blows. When the fuse blows, there is no need to replace it; simply closing the excitation closure 102 directly connects the backup circuit. To ensure the excitation closure also provides circuit protection after connecting the backup circuit, a second fuse 103 is connected in series in the backup circuit containing the excitation closure. (See [reference]). Figure 2 .

[0038] The purpose of this invention is to provide a structure for an excitation closure that can reliably operate according to a received trigger signal, and can achieve self-locking after closing to ensure reliable closure.

[0039] Excitation closure 102, see Figures 3 to 4 It includes a housing 2, and an electronic ignition tube 1, a piston 3, a moving bracket 4, a stationary bracket 5, a stationary contact 6, a moving contact 7, an insulating support 8, a contact spring 9, and a connecting rod 10 located in the housing 2.

[0040] in:

[0041] The outer casing 2 is a tubular structure made of insulating material. It has a hollow section extending through both ends. For ease of installation, several limiting steps are spaced apart within the hollow section, dividing it into segments with different inner diameters. The electronic ignition tube 1 and the stationary support 5 are located at opposite ends of the outer casing 2. The hollow section at the end of the outer casing 2 containing the electronic ignition tube 1 has the smallest inner diameter, and the electronic ignition tube 1 seals off that end of the outer casing 2.

[0042] The stationary bracket 5 is made of insulating material and has a cylindrical structure. The stationary bracket 5 is fixed to the end of the housing 2 furthest from the electronic ignition tube 1 by screws or other means. One end of the stationary bracket 5 extends into the housing and is fitted against the inner wall of the housing. The stationary bracket 5 and the inner wall of the housing can be fixed by interference fit, adhesive, or other methods. The end of the stationary bracket 5 facing the moving bracket 4 is an open end, and two through holes are provided on the end face of the end located at the end of the housing 2 for the stationary contact 6 to pass through. Several locking holes 501 are provided on the outer peripheral sidewall of the stationary bracket 2.

[0043] The two stationary contacts 6 are made of conductive material and have a columnar structure. One end of the columnar structure extends outward to form two terminals 104 of the excitation closure. In this embodiment, the terminals 104 and the stationary contacts 6 are integrally formed. In some embodiments, the terminals and the stationary contacts 6 may be separate parts. One end of the columnar structure of the two stationary contacts 6 passes through the through hole at the end of the stationary support 2 from the outside of the housing 2 and is suspended in the hollow part of the stationary support 5. The stationary support 5 supports the stationary contacts 6, and the two stationary contacts 6 on the stationary support 5 are insulated from each other.

[0044] The movable support 4 is made of insulating material and has a cylindrical structure similar to that of the stationary support 5. It is open at one end facing the stationary support 5, and has a through hole at the end away from the stationary support 5 for the insulating support member 8 to pass through. The movable support 4 can enter the outer periphery of the stationary support 5, and its inner diameter matches that of the stationary support 5. A limiting step surface 401 is provided on the outer periphery of the movable support 4 to limit the distance the movable support 4 travels into the stationary support 5. A corresponding latch 402 is provided on the movable support 4 at the corresponding latching hole position in the stationary support 5. When the movable support 4 enters the stationary support 5 to its final position, the latch 402 engages with the latching hole 201 in the stationary support 5, locking the movable support 4 onto the stationary support 5. One end of the movable support 4 away from the stationary support 5 abuts against the limiting step surface of the outer shell 2, and the other end passes through the open end of the stationary support 5. When the movable support is in its initial position, the buckle 402 of the movable support 4 contacts the end face of the stationary support 5, and the buckle 402 and the limiting step surface of the outer shell 2 form the initial position limitation of the movable support 4.

[0045] An insulating support 8 has one end passing through a through hole on the end of a movable support 4 away from the stationary support 5. It is connected to the insulating support 8 via a connecting rod 10 located outside the movable support 4, thus movably mounting the insulating support 8 on the movable support 4. For ease of connection and positioning, in this embodiment, the connecting rod 10 is a cross-shaped screw structure, with one end threaded to one end of the insulating support 8. Positioning wings on either side of the end connected to the insulating support 8 are engaged with the outer end face of the movable support 4 to prevent the insulating support 8 from detaching from the movable support 4. Furthermore, the movable support 4 can displace relative to the insulating support 8 under external force. (See also...) Figure 5 A plurality of umbrella-shaped structures 801 protruding from the outer periphery of the end of the insulating support member 8 facing the stationary support 5 are provided. The umbrella-shaped structures 801 are used to increase the creepage distance, and at the same time, the umbrella-shaped structures 801 serve as the contact surface structure against which the contact spring 9 abuts. In this embodiment, two umbrella-shaped structures 801 are provided at intervals along the displacement direction of the moving support on the outer periphery of the insulating support member 8. The contact spring 9 passes through the insulating support member 8, with one end abutting against the end of the moving support 4 away from the stationary support 5, and the other end abutting against the umbrella-shaped structures 801. The contact spring 9 is always in a compressed state. In some embodiments, the connecting rod may also be T-shaped.

[0046] The moving contact 7 is a plate-shaped structure, and is fixedly mounted on one end of the insulating support 8 facing the stationary bracket 5, corresponding to the two stationary contacts 6.

[0047] The piston 3 has one end located at the limiting step surface in the outer casing 2, and the other end abuts against the end face of the moving bracket 4 to define the initial position of the piston 3. A receiving groove is provided at the impact end face of the piston 3, and the connecting rod 10 is located in the receiving groove at the impact end face of the piston 3.

[0048] The electronic ignition tube 1 is a gas generating device that activates upon receiving a trigger signal, releasing high-pressure gas as the driving force. The end of the electronic ignition tube 1 that releases the driving force corresponds to the piston 3.

[0049] Working principle:

[0050] Under normal circumstances, the main circuit is equipped with a contactor and a fuse connected in series to protect the main circuit. An excitation closure is connected in parallel across the first fuse as a backup circuit, which is connected in series with the contactor. Under normal conditions, if the first fuse connected in series with the contactor does not open, the excitation closure remains open, thus disconnecting the backup circuit. When an abnormal situation occurs in the main circuit, the first fuse opens, disconnecting the main circuit. When the main circuit eliminates the abnormal situation and needs to be restored, it is not necessary to replace the first fuse. Instead, a trigger signal is sent to the electronic ignition tube 1. The electronic ignition tube 1 releases high-pressure gas according to the received trigger signal, which acts on the piston 3 to displace the piston 3. The piston 3 drives the moving bracket 4, along with the insulating support 8 and the moving contact 7, to move towards the stationary bracket 5. When the moving contact 7 contacts the two stationary contacts 6, the moving contact 7 and the insulating support 8 stop moving. The moving bracket 4 continues to move relative to the moving contact 7 and the insulating support 8 under the drive of the piston 3 until the buckle 402 on the moving bracket 4 is engaged in the buckle hole 501 on the stationary bracket 5. The moving bracket 4 then stops moving. At this time, the contact spring 3 is further compressed. Under the elastic force of the contact spring 3, the moving contact 7 and the stationary contact 6 are in close contact, causing the excitation closure to close, thereby connecting the backup circuit.

[0051] Since the moving bracket 4 is locked onto the stationary bracket 5, the moving contact 7 will not be moved away from the stationary contact 6 due to electric repulsion. Because the stationary contact 6 has a columnar structure and the moving contact 7 has a plate-like structure, the contact point is a double-contact contact, the contact pressure is high, the contact resistance is low, and the connection speed is fast. Therefore, compared with traditional closures, the excitation closure provided by this invention has high current carrying capacity and high connection capability.

[0052] The excitation closure device of the present invention can also integrate a fuse in series connection, with the fuse located in the housing of the excitation fuse. In series connection, the conductive end of one end of the fuse is conductively connected to one of the stationary contacts of the excitation closure device, and the other stationary contact and the conductive end of the other end of the fuse serve as two terminals for connecting the excitation closure device with integrated fuse to the external circuit.

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