Excitation closer

Abstract

The invention relates to the field of electric control and electric automobiles, in particular to an excitation closer which comprises a shell, an excitation source, a piston, a conductive structure, a first conductor and a second conductor, when the excitation closer is in an initial state, the conductive structure is limited between the piston and the first conductor, and the second conductor is limited between the piston and the second conductor. The first conductor and the second conductor are insulated from each other, and the conductive structure is in conductive contact with the first conductor; when the excitation source receives a trigger signal and releases driving force, the piston drives one end of the conductive structure to penetrate through the first conductor and make conductive contact with the second conductor under the action of the driving force, and the first conductor and the second conductor are in conductive connection through the conductive structure. The closing reliability is improved by the conductive structure passing through the first conductor and the second conductor.

Description

Technical Field

[0001] The invention relates to the field of power control and electric vehicles, in particular to the electric energy release protection of energy storage components after the main circuit of an electric fault is cut off, and specifically to an excitation closer for the electric energy release protection. Background Art

[0002] The main circuit of the battery pack of an electric vehicle is connected to many electrical components, including inductors, capacitors, motors, etc. When a fault current occurs in the main circuit of the battery pack, a thermal fuse or excitation device can quickly cut off the fault current and disconnect the battery pack from the main circuit. However, the inductors, capacitors, motors and other components in the external circuit of the battery pack also store a certain amount of electrical energy. If it cannot be released in time, it will bring safety hazards to vehicle operators and maintenance personnel in the future.

[0003] At present, there are corresponding protective devices, such as excitation closers, for the rapid release of residual electrical energy in the energy storage components of the battery pack of electric vehicles. The excitation closer is connected to the grounding branch on the main circuit of the electric vehicle and forms a parallel relationship with the battery pack. When the battery pack is working normally, this grounding branch is in a normally open state. When a fault current appears in the main circuit and is cut off, the excitation device of the normally open switching normally closed circuit of the present invention immediately acts, quickly connects the grounding branch, and releases the electrical energy of the energy storage components in the main circuit to ensure the safety of subsequent operations. Excitation closers with existing structures, such as an excitation protection device in which a control circuit is switched from normally open to normally closed disclosed in Chinese patent application 2021107188581, mainly have the following shortcomings: the conductor connection method is folding type, and the reliability is not high. When the conductor is driven and folded, there may be a risk that the folded conductor part is broken or the folded conductor part is offset and misaligned with the conductor part to be contacted, resulting in the protection device not being able to conduct normally, and there is a possibility of mechanical failure. Summary of the invention

[0004] The purpose of the present invention is to provide an excitation closer, which adds a conductive structure that can move linearly. Under the driving force of an excitation source, the piston drives the conductive structure to pass through a first conductor and a second conductor, the first conductor and the second conductor are insulated from each other, and the first conductor and the second conductor are conductively connected through the conductive structure. The conductive structure passes through the first conductor and the second conductor to improve the closing reliability, thereby ensuring that the grounding branch is quickly connected after the fault current in the main circuit of the battery pack is cut off, and releasing the residual energy of the energy storage components in the main circuit to ensure the safety of subsequent operations.

[0005] To achieve the above-mentioned purpose, the technical solution provided by the present invention is an excitation closer, comprising a shell, an excitation source, a piston, a conductive structure, a first conductor and a second conductor, wherein the excitation source and the piston are sequentially arranged in the shell; the first conductor and the second conductor are both passed through the shell, and one end of the first conductor and the second conductor located outside the shell are both connection ends; when the excitation closer is in an initial state, the conductive structure is limited between the piston and the first conductor, the first conductor and the second conductor are insulated from each other, and the conductive structure is in conductive contact with the first conductor; when the excitation source receives a trigger signal and releases a driving force, the piston, under the action of the driving force, drives one end of the conductive structure to pass through the first conductor and be in conductive contact with the second conductor, so that the first conductor and the second conductor are conductively connected through the conductive structure.

[0006] Preferably, a closed cavity is formed between the piston and the excitation source.

[0007] Preferably, the conductive structure is interference-fitted with the first conductor, or a portion of the conductive structure that passes through the first conductor is hooked with the first conductor.

[0008] Preferably, the first conductor portion located in the housing is a cylindrical structure, and the piston and the conductive structure are respectively located in the cylindrical structure.

[0009] Preferably, the cylindrical structure is tightly fitted or interference fit with the inner wall of the shell.

[0010] Preferably, the conductive structure is in movable conductive contact with the cylindrical structure.

[0011] Preferably, a limiting structure for limiting the initial position and displacement distance of the conductive structure is provided in the cylindrical structure.

[0012] Preferably, one end of the piston located on one side of the excitation source is opened to form a cavity, and when the piston is in an initial position, the end of the excitation source that releases the driving force is located in the cavity of the piston.

[0013] Preferably, an insulating member is provided between the first conductor and the second conductor; when the piston moves under the action of the driving force, the conductive structure is driven to move, and the conductive structure passes through the first conductor and the insulating member in sequence and makes conductive contact with the second conductor, so that the first conductor and the second conductor are conductively connected through the conductive structure.

[0014] Preferably, one end of the conductive structure passes through the first conductor and then through the second conductor, and is in conductive contact with the second conductor; when an insulating member is provided between the first conductor and the second conductor, one end of the conductive structure passes through the first conductor, the insulating member and the second conductor in sequence, and is in conductive contact with the second conductor.

[0015] Preferably, the first conductor and the second conductor at the position corresponding to the conductive structure are respectively provided with a through hole or a weak structure for allowing one end of the conductive structure to pass through for conductive contact with the first conductor.

[0016] Preferably, the weak structure is a tooth-shaped structure provided at the edge of the through hole; or the weak structure is a blind hole provided on the first conductor or the second conductor, and the bottom of the blind hole is configured as a groove.

[0017] Preferably, the conductive structure is a conductive nail, which includes a head and a conductive nail body connected to the head, or only includes a nail body; when the conductive nail includes a head and a nail body, the head is arranged in contact with the inner wall of the shell or the inner wall of the cylindrical structure of the first conductor; when the conductive nail only includes a nail body, the conductive nail is fixed on the piston at one end adjacent to the piston.

[0018] Preferably, the nail body is interference fit with the through hole or weak structure through which it passes, or a barb structure is provided on the outer peripheral surface of the nail body of the conductive nail, and the nail body is hooked with the through hole or weak structure through which it passes.

[0019] Preferably, when the conductive nail comprises only a nail body, the conductive nail is integrally provided with the piston.

[0020] Preferably, the shell is formed by docking a first shell and a second shell; the excitation source, the tubular structure of the first conductor, the piston, and the conductive structure are respectively located in the first shell, and the second conductor is passed through the second shell; the connecting ends of the first conductor and the second conductor pass through the contact surfaces of the first shell and the second shell respectively; and the insulating part is arranged at the contact surface of the first shell and the second shell.

[0021] Preferably, a limiting groove and an annular limiting ridge are provided on the end surface where the second shell and the first shell are connected, and one side of the limiting ridge extends toward the outer peripheral surface of the second shell to form an extension portion, and the limiting groove passes through the shell wall of the second shell and the limiting ridge; the insulating part and the first conductor are arranged on the limiting ridge in sequence, and the connecting end of the second conductor passes through the limiting groove; the first shell is provided with a corresponding positioning notch corresponding to the extension portion for the extension portion to be nested, and the limiting ridge is located in the first shell.

[0022] Beneficial effects of the present invention:

[0023] The conductive structure passes through the first conductor and then makes conductive contact with the second conductor, so that the first conductor and the second conductor are conductively connected, thereby improving the closing reliability.

[0024] Through the tubular structure of the first conductor, when the excitation source releases the driving force, the movement of the piston and the conductive structure is all within the first conductor. The tubular structure of the first conductor bears most of the impact energy, forming protection for the first shell. Therefore, when manufacturing the shell, the strength requirement of the first shell can be reduced.

[0025] Since the first conductor has a cylindrical structure and the piston is arranged as a cavity structure with one end open, the piston and the conductive structure are both arranged in the cylindrical structure of the first conductor. Except for the insulating film, the gap between the first conductor and the second conductor is reduced or there is no gap, which reduces the volume and overall size of the product, makes the structure more compact, and makes the product more suitable for miniaturization.

[0026] By providing an insulating film between the first conductor and the second conductor, the insulation effect between the first conductor and the second conductor is improved, while the distance between the first conductor and the second conductor is reduced, further reducing the product volume.

[0027] The driving force of the excitation source is used to release the piston structure with one end open at the other end. The gas detonated by the excitation source is sealed to generate a constant downward pressure, thereby preventing the piston and the conductive structure from withdrawing when they move to the end position, thereby improving safety and reliability.

[0028] The first conductor and the second conductor are connected through the conductive structure, and the electrical contact area is large, thereby improving the current carrying capacity.

[0029] The first conductor of the cylindrical structure, the piston structure with one end open, and the excitation source release end arranged in the piston structure in the initial position reduce the noise when the product is in motion and make the structure more compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the cross-sectional structure of the excitation closer, wherein Figure a is before the action and Figure b is after the action.

[0031] Figure 2 It is a schematic diagram of the explosion structure of the excitation closer.

[0032] Figure 3 Schematic diagram of the first conductor structure, wherein Figure a is a schematic diagram of the external three-dimensional structure of the first conductor, and Figure b is a schematic diagram of the internal three-dimensional structure of the first conductor.

[0033] Figure 4 It is a schematic diagram of the three-dimensional structure of a conductive nail. Figures a and b are schematic diagrams of the conductive nail structure from different viewing angles.

[0034] Figure 5 It is a schematic diagram of the second conductor structure, wherein Figure a is a structure in which the weak structure is a spherical groove set in the blind hole, and Figure b is a structure in which the weak structure is a toothed structure at the edge of the through hole.

[0035] Figure 6 2 is a schematic diagram of the second shell structure.

[0036] Figure 7 It is a conductive nail without a head, and the second conductor structure is Figure 5 Schematic diagram of the excitation closer structure of Figure a in the figure, where Figure a is before action and Figure b is after action.

[0037] Figure 8 The second conductor structure is Figure 5 Figure b is a schematic diagram of the excitation closer structure, where Figure a is before action and Figure b is after action.

[0038] Fig. 9 It is a schematic diagram of another structural form of the conductive structure and the second conductor, wherein Figure a is before the action and Figure b is after the action.

[0039] Excitation source 1; first shell 2; positioning notch 201; first conductor 3; cylindrical structure 301; end face 302; inner wall 303; through hole 304; limiting boss 305; connecting end 306; sealing ring 4; piston 5; sealing groove 501; conductive structure 6; head 601; nail body 602, sawtooth barb structure 603; insulating member 7; second conductor 8; through hole 801; connecting end 802; the other end 803 of the second conductor; blind hole 804; tooth structure 805; second shell 9; limiting groove 901; limiting ridge 902; cavity 903; extension part 904; limiting step 905. DETAILED DESCRIPTION

[0040] The excitation closer of the present invention comprises a shell, an excitation source 1, a piston 5, a conductive structure 6, a first conductor 3, and a second conductor 8. The excitation source and the piston are sequentially arranged in the shell, the first conductor and the second conductor are passed through the shell, and the ends of the first conductor and the second conductor located outside the shell are both connection ends; when the excitation closer is in an initial state, the conductive structure is limited between the piston and the first conductor, the first conductor and the second conductor are insulated from each other, and the conductive structure is in conductive contact with the first conductor; when the excitation source receives a trigger signal and releases a driving force, the piston, under the action of the driving force, drives one end of the conductive structure to pass through the first conductor and be in conductive contact with the second conductor, so that the first conductor and the second conductor are conductively connected through the conductive structure.

[0041] In this scheme, when the piston moves under the driving force released by the excitation source and drives the conductive structure to move, and one end of the conductive structure passes through the first conductor and is in conductive contact with the second conductor, at least a portion of the conductive structure, or at least a portion of one end of the conductive structure passing through the first conductor, can be limited between the first conductor and the second conductor (for example, the conductive structure abuts between the first conductor and the second conductor, or, while keeping the conductive structure in contact with the first conductor, it abuts between the piston and the second conductor, or, while keeping the conductive structure in contact with the second conductor, it abuts between the piston and the first conductor), so that the conductive structure remains in a position that conducts the first conductor and the second conductor, so that the excitation closer can be more safely and reliably maintained in the closed position after closing.

[0042] In a preferred embodiment, a closed cavity is formed between the piston and the excitation source (that is, when the space between the piston and the excitation source in the shell is a closed cavity), when the excitation closer is actuated, the driving force released by the excitation source through the conductive structure is limited to the closed position of the excitation closer, thereby making the closing of the excitation closer more reliable.

[0043] In another preferred embodiment, the conductive structure is interference fit with the first conductor, or the portion of the conductive structure that passes through the first conductor is hooked with the first conductor, so that after the excitation closer is closed, it remains in a safe and reliable closed state.

[0044] In the above scheme, an insulating part can be arranged between the first conductor and the second conductor located in the shell; the first conductor part located in the shell can be arranged as a cylindrical structure with openings at both ends, and the piston and the conductive structure can be respectively located in the cylindrical structure; when the excitation source receives a trigger signal to release the driving force, the piston, under the action of the driving force, drives one end of the conductive structure to pass through the insulating part, the first conductor and the second conductor in sequence, so that the first conductor and the second conductor are conductively connected through the conductive structure.

[0045] The excitation source of the present invention is a device that can release driving force under a trigger signal, such as a gas generating device, which ignites and releases high-pressure gas as driving force under a trigger signal.

[0046] The preferred embodiments are described in detail below with reference to the drawings.

[0047] See also Figures 1 to 8 The shell is made of insulating material and is formed by splicing a first shell 2 and a second shell 9. The first shell 2 and the second shell 9 are integrally formed. The first shell 2 and the second shell 9 are connected to form a receiving cavity, and the excitation source 1, the piston 5, the conductive nail 6, the first conductor 3, the insulating member 7, and the second conductor 8 are respectively arranged in the receiving cavity.

[0048] The second shell 9 is open at one end, and its open end is in contact with the first shell 2. An annular limiting ridge 902 and a limiting groove 901 are provided on the end surface of the open end of the second shell 9. One side of the limiting ridge 902 extends toward the outer peripheral surface of the second shell 9 to form an extension 904. The limiting ridge 902 and the extension 904 are flush with each other and are used to place the insulating member 7 and the first conductor 3. The limiting groove 901 penetrates the thickness of the shell wall of the second shell 9 and the thickness of the limiting ridge 902, and is used for the connection end 802 of the second conductor 8 to pass through the limiting groove 901. A cavity 903 for displacement of the conductive structure 6 is provided in the second shell within the limiting ridge 902, and a limiting step 905 for placement of the other end 803 of the second conductor 8 is provided in the cavity.

[0049] The first shell 2 is provided with a corresponding positioning notch 201 corresponding to the protruding extension 904. When the first shell 2 and the second shell 9 are docked, the extension 904 and the corresponding positioning notch are nested and docked. At the same time, the limiting ridge 902 is located at the inner wall of the first shell 2 to form a position limit. The second shell 9 is positioned by the extension 904 of the second shell and the positioning notch of the first shell 2, and is connected by bolt connection or ultrasonic welding.

[0050] The excitation source 1 is arranged at the top of the cavity of the first shell 2, and the signal receiving end of the excitation source 1 can be connected to the signal trigger source outside the shell. The fixing method of the excitation source 1 and the first shell 2 can meet the fixing requirements, such as interference press-fitting inside the first shell 2, or buried mold injection molding inside the first shell, and a pressing piece can be added at its upper end to cooperate with the first shell 2 to limit the position.

[0051] The first conductor 3, see Figure 3 , made of conductive material, including a tubular structure 301 and a connecting end 306, wherein the tubular structure 301 is integrally connected with the connecting end 306. The tubular structure 301 is a cylindrical structure, with an open end facing the excitation source 1, and a through hole 304 is provided on the end surface 302 facing the first conductor 8. The through hole 304 is located in the tubular structure 301 and extends toward the excitation source 1 to form an annular limiting boss 305. The limiting boss 305 on the first conductor 3 is preferably an integral structure with the first conductor 3. In other embodiments, it can also be set as two separate parts. The limiting boss 305 is a metal part and is welded to the inner bottom surface of the tubular structure 301 of the first conductor 3. The tubular structure 301 and the connecting end 306 of the first conductor 3 are preferably an integral machined part or a casting. The tubular structure 301 and the connecting end 306 can also be set as two separate parts and connected by welding.

[0052] The end face 302 of the tubular structure 301 of the first conductor 3 is placed on the limiting ridge 902 of the second shell 9, and the connecting end 306 extends out of the shell through the contact surface of the extension part 904. The end face 302 contacts the limiting ridge 902. The outer peripheral surface of the tubular structure is located in the inner wall of the first shell 2, and is interference fit or tightly fit with the inner wall of the first shell 2, forming a closed cavity between the first conductor and the excitation source. An insulating member 7 is arranged between the first conductor 2 and the limiting ridge 902. In the initial state of the product, the insulating member 7 completely isolates the first conductor and the second conductor in the shell, so that they are completely insulated, avoid electrical breakdown and connection, and are always in a circuit disconnected state; when the excitation source is activated, when the conductive structure 6 pierces the insulating film, the first conductor and the second conductor are conductively connected, and the circuit is connected. The insulating member 7 is an insulating film. By setting the insulating film 7, the first conductor and the second conductor can be effectively isolated, the insulation distance between the first conductor and the second conductor can be shortened, and the product volume can be reduced. The material of the insulating film can be polymer plastic, insulating paper, ceramic sheet, or glass. A plastic insulating film is preferred. The insulating film is preferably pasted on the bottom surface 302 of the first conductor. The insulating film can also be pasted on the surface of the second conductor. Figure 1 A certain space is reserved between the first conductor and the second conductor. Figures 7 and 8 In the embodiment, the first conductor 3 and the second conductor 8 are separated only by the insulating film 7, and no space is reserved, which can further make the product structure compact. In the housing, the first conductor 3 and the second conductor 8 can be arranged in parallel at the overlapping position along the moving path of the conductive structure. The parallel arrangement is the preferred solution. In the parallel arrangement, the space in the housing is saved, and the movement stroke of the conductive structure can be minimized while ensuring the insulation distance. Of course, the arrangement can also be non-parallel.

[0053] A piston 5 and a conductive structure 6 are sequentially arranged in the cylindrical structure 301 of the first conductor 3. The piston 5 is made of an insulating material. The end of the piston 5 located on the side of the excitation source 1 is an open end, and its longitudinal section is concave, forming a cavity in the piston 5. When the piston 5 is in the initial position, the end where the driving force of the excitation source 1 is released is located in the cavity at the open end of the piston 5. A sealing groove 501 is preferably provided on the outer periphery of the piston 5, and a sealing ring 4 is provided in the sealing groove. Through the sealing ring 4, the piston 5 is in sealing contact with the inner wall 303 of the cylindrical structure 301 of the first conductor to form a sealed cavity, thereby preventing the high-pressure gas released by the excitation source from leaking out and reducing the driving force. Through the structure of the piston, the driving force released by the excitation source can be fully utilized, so that the driving force released by the excitation source can act on the piston 5 to the maximum extent; at the same time, part of the impact energy can be buffered by the piston. Through the tubular structure of the first conductor, the piston and the driving force release end of the excitation source are both located in the tubular structure of the first conductor, so as to buffer the impact energy generated by the driving force released by the excitation source, protect the shell, avoid shell cracking or even shell explosion, and improve the safety performance of the product; at the same time, through this structure, the product structure is made more compact and the product volume is reduced.

[0054] In other embodiments, the first conductor 3 can eliminate the cylindrical structure, and the piston 5 and the conductive structure 6 are directly arranged in the cavity of the first shell 2. A limiting structure for the conductive structure 6 needs to be set in the cavity of the first shell 2, or a limiting structure for limiting the conductive structure 6 is set on the first conductor 3, such as the through hole 304 on the first conductor 3.

[0055] In other embodiments, the piston 5 may not be provided with a sealing ring, and it only needs to be interference fit with the inner wall of the cylindrical structure of the first conductor or the inner wall of the first shell.

[0056] Conductive structure 6, see Figure 1 to Figure 2 , Figure 4 , and the cylindrical structure of the first conductor can be movably conductively contacted. In this embodiment, the conductive structure 6 is a conductive nail, which is T-shaped and is made by machining or casting. The conductive nail 6 includes a head 601 and a nail body 602; its head 601 is located on one side of the piston 5, and the outer peripheral side surface of the head 601 is arranged in contact with the inner wall 303 of the cylindrical structure 301 of the first conductor 3. One purpose is to improve the guiding property of the conductive nail movement, and the second purpose is to increase the conductive contact area between the conductive nail and the first conductor, so that the conductive contact is more reliable. The outer diameter of the nail body 602 is larger than the inner diameter of the through hole 304, and the outer diameter of the tip of the nail body 602 (i.e., the impact end) is smaller than the inner diameter of the through hole 304. The tip of the nail body 602 is located in the through hole 304, forming a limit on the initial position of the conductive nail 6, and the displacement distance of the conductive nail 6 is limited by the limiting boss 305. The conductive nail 6 is positioned at its initial position by the through hole 304 and the piston 5, and the conductive structure and the piston displacement distance are limited by the limiting boss 305. The movement of the conductive nail is guided and limited by the inner wall 303 of the cylindrical structure 301 of the first conductor 3 and the through hole 304. When the nail body 602 of the conductive nail 6 passes through the through hole 304, an interference fit is formed with the through hole 304. The interference fit prevents the conductive nail 6 from withdrawing after passing through the first conductor 3, resulting in poor conductive contact with the second conductor. The piston 5 is located above the conductive nail 6, and the piston 5 is supported by the head of the conductive nail to limit its initial position. When the limiting boss 305 is not provided on the first conductor 3, the initial position and displacement distance of the conductive structure are limited by the through hole 304.

[0057] In some embodiments, a sawtooth barb structure 603 is provided on the outer peripheral surface of the nail body 602. Through the sawtooth barb structure 603 on the conductive nail, when the conductive structure passes through the first conductor, a hook structure is formed with the first conductor, so that after the conductive nail is actuated, the conductive nail can be prevented from withdrawing and affecting the conductive connection between the first conductor and the second conductor, thereby improving the reliability of the conductive connection between the first conductor and the second conductor.

[0058] In some embodiments, the conductive nail 6 may not be provided with the head 601, and only the nail body 602 may be retained. Figure 7 When only the nail body 602 is retained, a mounting hole for mounting the conductive nail 6 is provided at the bottom of the piston 5, and one end of the conductive nail 6 is interference-fitted with the mounting hole of the piston 5 to support the piston 5. Alternatively, the conductive nail 6 and the mounting hole at the piston 5 are integrally formed by buried mold injection molding. In short, when only the nail body of the conductive nail is retained, the conductive nail 6 needs to be fixedly set at the bottom of the piston 5. When the piston drives the conductive nail to move together, the limiting boss 305 on the first conductor limits the piston.

[0059] The second conductor 8, see Figure 1 to Figure 2 , is inserted into the limiting groove 901 of the second shell 9, the connection end 802 of the second conductor 8 passes through the limiting groove 901 and is located outside the shell, and the other end 803 of the second conductor 8 located inside the second shell is located on the limiting boss 905 inside the second shell 9. The second conductor 8 is made by a stamping process. A through hole 801 is provided at the position of the second conductor 8 in the second shell 9 corresponding to the through hole 304 of the first conductor 3, and the inner diameter of the through hole 801 is larger than the outer diameter of the nail body 602 of the conductive nail 6. When the conductive nail passes through the through hole 801, an interference fit is formed.

[0060] See also Figure 5 In the figure a, the through hole 801 of the second conductor 8 for the conductive nail 6 to pass through may not be a through hole, but may be a blind hole 804. The bottom of the blind hole 804 is set as an arc-shaped groove to form a weak structure, and the blind hole 804 and the conductive nail are interference-fitted. When the conductive nail 6 passes through the second conductor 8, see Figure 7 The conductive nail 6 passes through the blind hole 804 and breaks the arc-shaped groove.

[0061] See also Figure 5 In FIG. b, the edge of the through hole 801 can also be a toothed structure 805 to form a flower-shaped pre-break as a weak structure, see Figure 8 When the conductive nail 6 passes through the flower-shaped pre-broken opening, the tooth-shaped structure 805 can be broken.

[0062] In some embodiments, a sawtooth barb structure 603 is provided on the outer peripheral surface of the nail body 602. Through the sawtooth barb structure 603 on the conductive nail, when the conductive structure passes through the first conductor and the second conductor, a hook structure is formed with the first conductor and the second conductor. After the conductive nail is actuated, the conductive nail can be prevented from withdrawing, thereby affecting the conductive connection between the first conductor and the second conductor, thereby improving the reliability of the conductive connection with the first conductor and the second conductor.

[0063] The first conductor 3 and the second conductor 8 extend out of the connection end of the housing, which is convenient for installation in an external circuit. They can be installed in the external circuit by means of bolt crimping, quick plug-in terminals, etc.

[0064] Working principle:

[0065] In the normal working state, that is, the initial state of the product, the first conductor and the second conductor are insulated and isolated by the insulating member, and the circuit is always in a disconnected state.

[0066] When a fault current occurs, the excitation source 1 is actuated according to the received trigger signal, releases the driving force, drives the piston 5 to move, and displaces along the inner wall of the cylindrical structure 301 of the first conductor 3, drives the conductive nail 6 to pass through the through hole 304 of the first conductor 3, pierces the insulating film 7, and then passes through the through hole 801 on the second conductor 8. When the head 601 of the conductive nail 6 contacts the limiting boss 305, the conductive nail 6 stops moving. Since the nail body 602 of the conductive nail 6 is interference fit with the through hole 304 of the first conductor and the through hole 801 of the second conductor, after the conductive nail 6 passes through the first conductor 3 and the second conductor 8, it can ensure that the conductive nail 6 is in conductive contact with the first conductor 3 and the second conductor 8, thereby realizing a reliable conductive connection between the first conductor and the second conductor, and putting the circuit in a conductive state. Due to the serrated barb structure on the conductive nail 6, the conductive nail will not rebound; at the same time, since the piston 5 in the first conductor 3 is provided with a sealing ring 4, the sealing ring 4 can prevent gas leakage, and a stable pressure is formed between the piston 5 and the excitation source 1, so that the conductive nail 6 can rely on the pressure to stably connect the first conductor 3 and the second conductor 8.

[0067] The excitation closer of the present invention has the following advantages:

[0068] Due to the tubular structure of the first conductor, when the excitation source releases the driving force, the movement of the piston and the conductive nail is all within the first conductor. The tubular structure of the first conductor withstands a large amount of impact energy, forming protection for the first shell. Therefore, when manufacturing the shell, the strength requirement of the first shell can be reduced.

[0069] Since the first conductor has a cylindrical structure and the piston is arranged as a cavity structure with one end open, the piston and the conductive nail are arranged in the cylindrical structure of the first conductor, and the gap between the first conductor and the second conductor is reduced or eliminated except for the insulating film, the volume and overall size of the product are reduced, the structure is more compact, and the product is more suitable for miniaturization.

[0070] The gas after the excitation source is detonated is sealed, generating a constant downward pressure, preventing the piston and the conductive nail from retreating when they reach the end position, thus improving safety and reliability.

[0071] The first conductor and the second conductor are connected by a conductive nail, so that the electrical contact area is large and the current carrying capacity is improved.

[0072] The above technical solution is a structural form in which the conductive structure passes through the first conductor and the second conductor to make the first conductor and the second conductor conductive. In some other embodiments, the conductive structure can achieve conductive contact between the first conductor and the second conductor without passing through the second conductor. Fig. 9 ,exist Figure 8 On the basis of the invention, the tip of the nail body of the conductive nail 6 is removed, and the impact end of the conductive nail 6 that contacts the limiting boss 305 at the through hole 304 of the first conductor 3 is a planar structure. The purpose of setting the impact end as a planar structure is to increase the contact area with the second conductor. No through hole, blind hole or weak structure is provided on the second conductor 8 for the conductive nail 6 to pass through. A closed cavity is formed between the excitation source 1 and the piston 5. After the piston 5 and the conductive structure 6 are displaced, the closed cavity is still maintained between the excitation source 1 and the piston 5, so that the driving force formed by the high-pressure gas always exists, forming a pressure on the piston and the conductive structure, so that after the action, it is always located at the end position, ensuring the reliability of the contact. Its working principle: the excitation source 1 acts according to the received trigger signal, releases the driving force, drives the piston 5 to displace, and after the piston 5 drives the conductive nail 6 to pass through the through hole 304 and the insulating member 7 on the first conductor, it contacts the surface of the second conductor 8 with conductive contact, and the conductive connection between the first conductor 3 and the second conductor 8 is realized through the conductive nail 6. In order to make the conductive contact more reliable, a barb structure is provided on the nail body of the conductive nail 6, or the nail body of the conductive nail 6 is interference-fitted with the through hole 304 of the first conductor, so that the conductive structure 6 will not withdraw after passing through the first conductor 3, and prevent the conductive nail 6 from rebounding after the conductive contact with the second conductor 8, resulting in poor contact. At the same time, through the closed cavity formed between the excitation source and the piston, when the conductive structure moves to the end position, sufficient driving force is always maintained on the conductive structure and the piston, pressing the piston and the conductive structure to be always in the end position, preventing them from rebounding, and ensuring contact reliability.

Claims

1. An excitation closer, characterized in that: The invention comprises a shell, an excitation source, a piston, a conductive structure, a first conductor and a second conductor, wherein the excitation source and the piston are sequentially arranged in the shell; the first conductor and the second conductor are both arranged in the shell, and one end of the first conductor and the second conductor located outside the shell are both connection ends; when the excitation closer is in an initial state, the conductive structure is limited between the piston and the first conductor, the first conductor and the second conductor are arranged to be insulated from each other, and the conductive structure is in conductive contact with the first conductor; When the excitation source receives a trigger signal and releases a driving force, the piston, under the action of the driving force, drives one end of the conductive structure to pass through the first conductor and make conductive contact with the second conductor, so that the first conductor and the second conductor are conductively connected through the conductive structure.

2. The energizing closer according to claim 1, characterized in that: A closed cavity is formed between the piston and the excitation source.

3. The energizing closer according to claim 1, characterized in that: The conductive structure is interference-fitted with the first conductor, or a portion of the conductive structure that passes through the first conductor is hooked with the first conductor.

4. The energizing closer according to claim 1, characterized in that: The first conductor portion located in the housing is a cylindrical structure, and the piston and the conductive structure are respectively located in the cylindrical structure.

5. The energizing closer according to claim 4, characterized in that: The cylindrical structure is tightly fitted or interference fit with the inner wall of the shell.

6. The energizing closer according to claim 4, characterized in that: The conductive structure is in movable conductive contact with the cylindrical structure.

7. The energizing closer according to claim 4, characterized in that: A limiting structure for limiting the initial position and displacement distance of the conductive structure is arranged in the cylindrical structure.

8. The energizing closer according to claim 4, characterized in that: One end of the piston located at one side of the excitation source is opened to form a cavity. When the piston is in the initial position, the end of the excitation source that releases the driving force is located in the cavity of the piston.

9. An energizing closer according to any one of claims 1 to 8, characterized in that An insulating member is provided between the first conductor and the second conductor; when the piston moves under the action of the driving force, the conductive structure is driven to move, and the conductive structure passes through the first conductor and the insulating member in sequence, and makes conductive contact with the second conductor, so that the first conductor and the second conductor are conductively connected through the conductive structure.

10. An energizing closer according to any one of claims 1 to 8, characterized in that One end of the conductive structure passes through the first conductor and then through the second conductor, and is in conductive contact with the second conductor; when an insulating member is provided between the first conductor and the second conductor, one end of the conductive structure passes through the first conductor, the insulating member and the second conductor in sequence, and is in conductive contact with the second conductor.

11. The energizing closer according to claim 10, characterized in that: The first conductor and the second conductor at the position corresponding to the conductive structure are respectively provided with a through hole or a weak structure for passing one end of the conductive structure that is in conductive contact with the first conductor.

12. The energizing closer according to claim 11, characterized in that The weak structure is a tooth-shaped structure opened on the edge of the through hole; or the weak structure is a blind hole opened on the first conductor or the second conductor, and the bottom of the blind hole is set as a groove.

13. The energizing closer according to any one of claims 1 to 8, characterized in that: The conductive structure is a conductive nail, which includes a head and a conductive nail body connected to the head, or only includes the nail body; when the conductive nail includes the head and the nail body, the head is arranged in contact with the inner wall of the shell or the inner wall of the cylindrical structure of the first conductor; when the conductive nail only includes the nail body, the end of the conductive nail adjacent to the piston is fixedly arranged on the piston.

14. The energizing closer according to claim 13, characterized in that The nail body is interference fit with the through hole or weak structure through which it passes, or the outer peripheral surface of the nail body of the conductive nail is provided with a barb structure, and the nail body is hooked with the through hole or weak structure through which it passes.

15. The energizing closer according to claim 13, characterized in that: When the conductive nail only includes a nail body, the conductive nail is integrally provided with the piston.

16. An energizing closer according to any one of claims 1 to 8, characterized in that The shell is formed by connecting a first shell and a second shell; the excitation source, the tubular structure of the first conductor, the piston, and the conductive structure are respectively located in the first shell, and the second conductor is penetrated through the second shell; the connecting ends of the first conductor and the second conductor pass through the contact surface of the first shell and the second shell respectively; and the insulating part is arranged at the contact surface of the first shell and the second shell.

17. The energizing closer according to claim 16, characterized in that A limiting groove and an annular limiting ridge are provided on the end surface where the second shell and the first shell are connected. One side of the limiting ridge extends toward the outer peripheral surface of the second shell to form an extension portion, and the limiting groove passes through the shell wall of the second shell and the limiting ridge; the insulating part and the first conductor are arranged on the limiting ridge in sequence, and the connecting end of the second conductor passes through the limiting groove; the first shell is provided with a corresponding positioning notch corresponding to the extension portion for the extension portion to be nested, and the limiting ridge is located in the first shell.

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