Excitation closer for improving closing reliability

Abstract

An excitation closer capable of improving closing reliability comprises a shell with a cavity, a first conductor and a second conductor, the first conductor and the second conductor are arranged in the shell in a penetrating mode in an insulated and opposite spaced mode, an excitation source and a piston are arranged in the cavity of the shell, the piston is of a shell-shaped structure with one end open and one end closed, and at least the peripheral face of the piston is made of conductive materials. The open end of the piston faces the driving force release end of the excitation source, and the closed end of the piston is arranged corresponding to the relatively spaced ends of the first conductor and the second conductor; the excitation source can act according to a received trigger signal to release driving force to drive the piston to move towards the first conductor and the second conductor, so that the piston is clamped between the ends, oppositely arranged at intervals, of the first conductor and the second conductor in a plastic deformation mode, and the first conductor and the second conductor are conducted. According to the invention, the reliability of conduction between the first conductor and the second conductor is improved through the plastically deformed piston.

Description

Technical Field

[0001] The invention relates to the fields of power control and electric vehicles, in particular to an excitation closer for protecting energy storage components from releasing electric energy after a main circuit of an electric fault is cut off. Background Art

[0002] In addition to traditional thermal cutouts, electric vehicle battery pack main circuit protection devices now have a structure that can quickly cut off the opening (i.e., an excitation device), and its application range is gradually expanding. It can quickly realize the normally closed to normally open function of the electric switch. It overcomes the shortcomings of traditional fuses and has the advantages of low power consumption (low heat generation), small size and weight, good resistance to current shock, and fast breaking time.

[0003] The battery pack's main circuit is connected to numerous electrical components, including inductors, capacitors, and motors. When a fault current flows through the main circuit, a thermal fuse or excitation device interrupts the current, disconnecting the battery pack from the main circuit. However, components like inductors, capacitors, and motors in the external circuits of the battery pack also store a certain amount of undischarged electrical energy, posing a safety hazard to personnel during subsequent repairs.

[0004] At present, after the main circuit of the electric vehicle battery pack is cut off, the residual electrical energy in the energy storage components poses a safety hazard that cannot be ignored. Based on this discharge requirement, an excitation closer structure has emerged that can quickly realize the circuit normally open to normally closed function.

[0005] The excitation closer is connected to the grounding branch of the electric vehicle's main circuit, in parallel with the battery pack. When the battery pack is operating normally, this grounding branch is normally open. When a fault current appears in the main circuit and it is disconnected, the excitation closer immediately triggers, quickly connecting the grounding branch and releasing the energy stored in the main circuit to ensure safe subsequent operation.

[0006] CN202220062267.3 An excitation closer with enhanced insulation capability has disclosed an implementation structure, including a housing and an excitation source disposed in the housing, a piston, a first conductor, a second conductor, and a cap-shaped third conductor sleeved on the piston. After the excitation source is activated, the piston drives the third conductor to move between the first conductor and the second conductor and to be in contact, so that the circuit is conducted through the first conductor, the third conductor, and the second conductor. In the above technical solution, since the third conductor is sleeved on the piston, when the piston drives the third conductor to move to contact the first conductor and the second conductor, the third conductor is restricted by the piston and cannot be deformed or the deformation is very small, resulting in a relatively small contact area between the third conductor and the first conductor and the second conductor, and unreliable conduction. Summary of the Invention

[0007] The purpose of the present invention is to provide an excitation closer that improves closing reliability, by causing a conductive piston with a shell-like structure to undergo plastic deformation between a first conductor and a second conductor, thereby increasing the contact area between the piston and the first conductor and the second conductor, and improving the reliability of the first conductor and the second conductor after conduction.

[0008] To achieve the above-mentioned purpose, the technical solution provided by the present invention is an excitation closer for improving closing reliability, comprising: a shell, a first conductor, a second conductor, a piston, and an excitation source; a cavity is provided in the shell, the first conductor and the second conductor are respectively inserted into the shell in an insulated manner, one end of the first conductor and the second conductor located in the cavity of the shell are relatively spaced and insulated, the excitation source and the piston are respectively provided in the cavity, the piston is a shell-like structure with one end open and the other end closed, and at least the outer peripheral surface of the piston is made of conductive material; the open end of the piston is arranged toward the end releasing the driving force of the excitation source, and the excitation source and the piston are respectively provided in the cavity, The closed end of the plug is set corresponding to one end of the first conductor and the second conductor that are relatively spaced apart, and the initial position of the piston is limited by a limiting structure; the excitation source can be actuated according to the received trigger signal, releasing the driving force to drive the piston to move toward the first conductor and the second conductor, and the closed end of the piston passes between one end of the first conductor and the second conductor that are relatively spaced apart, and the one end of the first conductor and the second conductor that are relatively spaced apart contacts the outer peripheral surface of the piston to cause plastic deformation of the piston, and the piston is stuck between the one end of the first conductor and the second conductor that are relatively spaced apart in a plastic deformation manner, so that the first conductor and the second conductor are conductive.

[0009] Preferably, one end of the first conductor and the second conductor located in the cavity of the housing and spaced apart from each other is bent and tilted in a direction away from the excitation source to form a hook-shaped structure.

[0010] Preferably, one end of the first conductor and the second conductor in the hook-hand-shaped structure respectively has a multi-finger structure.

[0011] Preferably, the bending angle of one end of the first conductor and the second conductor in the hook-shaped structure is between 10 degrees and 60 degrees.

[0012] Preferably, the piston is a shell-like structure with a circular cross-section or a rounded rectangular cross-section, and the cross-sectional area from the open end to the closed end of the piston is uniformly equal, or the cross-sectional area from the open end to the closed end of the piston decreases uniformly, or the cross-sectional area from the open end to the closed end of the piston decreases unevenly, and there is at least one step-like structure between the open end and the closed end of the piston.

[0013] Preferably, the limiting structure is at least one limiting column arranged in the housing.

[0014] Preferably, a rounded arc surface is provided on the outer periphery of the closed end of the piston or the stepped structure of the piston, and the limiting column supports the rounded arc surface, and the supporting surface of the limiting column is an inclined surface or a rounded arc surface.

[0015] Preferably, the open end of the piston is provided with a flange structure, and the limiting column supports the flange structure of the piston.

[0016] Preferably, a rib is provided at the bottom of the housing cavity away from the excitation source at a position corresponding to the center diameter of the closed end of the piston. When the piston moves to the end position, the rib causes the closed end of the piston to undergo plastic deformation.

[0017] Preferably, a buffer gasket is provided at the bottom inside the closed end of the piston.

[0018] Preferably, a buffer gasket is provided at the bottom inside the closed end of the piston.

[0019] Preferably, the shell includes a first shell and a second shell, the first shell is provided with a through hollow part, the second shell is nested in one end of the hollow part of the first shell to close the end of the first shell, and the excitation source is provided at the other end of the hollow part of the first shell to close the other end of the shell; the second shell is provided with a accommodating groove toward one end of the first shell, the accommodating groove and the hollow part of the first shell are connected to form the cavity of the shell, the first conductor and the second conductor are respectively arranged between the contact surfaces on the opposite sides of the first shell and the second shell, and the piston is located in the hollow part of the first shell; the limiting structure is located on the inner wall of the accommodating groove of the second shell, and extends into the first shell to form an initial position limit for the piston.

[0020] The piston of the present invention is a thin shell structure of a conductive material, such as a cap-shaped structure, which is displaced to between one end relatively spaced apart from the first conductor and the second conductor. When in contact with them, the piston can undergo adaptive plastic deformation according to the shape of the one end relatively spaced apart from the first conductor and the second conductor, thereby increasing the contact area between the piston and the first conductor and the second conductor. Due to the plastic deformation of the piston, the piston is stuck between the first conductor and the second conductor, forming a limit on the piston's end position, thereby improving the stability and reliability of the electrical conduction of the first conductor and the second conductor.

[0021] The piston of the present invention is made of conductive material and has an integrated structure, which combines displacement and conductive functions, saves parts, has a simpler structure, and is easy to process.

[0022] The shell structure of the present invention improves exhaust, reduces exhaust, and avoids affecting surrounding devices.

[0023] The excitation closer of the present invention can quickly connect the grounding branch after the fault current in the main circuit of the battery pack is cut off, thereby releasing the residual energy of the energy storage components in the main circuit to ensure the safety of subsequent operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of the excitation closer in the initial state.

[0025] Figure 2 yes Figure 1 Schematic diagram of the structure of the actuator when the piston is in the end position.

[0026] Figure 3 yes Figure 1 Schematic diagram of the piston structure.

[0027] Figure 4 This is a schematic diagram of the excitation closer structure in another structural form of the piston in the initial state.

[0028] Figure 5 yes Figure 4 Schematic diagram of the structure of the actuator when the piston is in the end position.

[0029] Figure 6 yes Figure 4 Schematic diagram of the piston structure.

[0030] Figure 7a The present invention is a schematic diagram of a hook-shaped structure in which one end of a first conductor and a second conductor located in a shell cavity are relatively spaced and insulated from each other and have a single finger.

[0031] Figure 7b The present invention is a schematic diagram of a hook-shaped structure in which a first conductor and a second conductor located in a shell cavity are arranged relatively spaced apart and insulated at one end and have two fingers.

[0032] Figure 7c The present invention is a schematic diagram of a hook-shaped structure with three fingers at one end in which a first conductor and a second conductor located in a shell cavity are relatively spaced and insulated.

[0033] Figure 8 It is a structural diagram when ribs are provided at the bottom of the cavity of the shell and the piston is in the initial position.

[0034] Figure 9 yes Figure 8 Structural diagram of the piston at the end position of displacement.

[0035] Figure 10 It is a structural diagram when a buffer gasket is set at the closed end of the piston and the piston is in the initial position.

[0036] Figure 11 yes Figure 10Structural diagram of the piston at the end position of displacement.

[0037] Figure 12 is Figure 10 Based on the above, a structural diagram is shown when a rib is provided at the bottom of the cavity of the shell and the piston is in the initial position.

[0038] Figure 13 yes Figure 12 Structural diagram of the piston at the end position of displacement.

[0039] Reference numerals:

[0040] Excitation source 1; first shell 2; piston 3; first conductor 4; second conductor 5; second shell 6, limiting column 601, flange structure 301, rib 9, buffer gasket 10, one end 4a of the first conductor located in the shell cavity, and one end 5a of the second conductor located in the shell cavity. DETAILED DESCRIPTION

[0041] The present invention provides an excitation closer for improving closing reliability, comprising: a housing, a first conductor, a second conductor, a piston, and an excitation source; the housing having a cavity, the first conductor and the second conductor being respectively disposed through the housing in an insulated manner; one end of the first conductor and the second conductor being located in the cavity of the housing being spaced apart and insulated from each other; the excitation source and the piston being respectively disposed in the cavity; the piston being a shell-like structure with one end open and the other closed, and at least the outer peripheral surface of the piston being made of a conductive material; the open end of the piston being disposed toward the end where the driving force of the excitation source is released, the closed end of the piston being disposed corresponding to the end where the first conductor and the second conductor are spaced apart from each other, and the initial position of the piston being defined by a limiting structure; the excitation source being operable in response to a received trigger signal, releasing the driving force to drive the piston toward the first conductor and the second conductor, and the closed end of the piston passing between the ends where the first conductor and the second conductor are spaced apart from each other, the ends where the first conductor and the second conductor are spaced apart from each other contacting the outer peripheral surface of the piston, causing the piston to undergo plastic deformation; the piston being plastically deformed and clamped between the ends where the first conductor and the second conductor are spaced apart from each other, thereby causing the first conductor and the second conductor to conduct.

[0042] The excitation source is a gas generator that can be activated according to the trigger signal received, releasing high-pressure gas as a driving force. The housing is made of non-conductive material.

[0043] The preferred embodiments are described below in detail with reference to the accompanying drawings. The directional words involved are based only on the directions shown in the accompanying drawings and do not constitute a limitation on the technical solution of the present invention.

[0044] The invention provides an excitation closer for improving the closing reliability. Figures 1 to 3The shell includes a first shell 2 and a second shell 6 that are spliced ​​together. The first shell 2 is provided with a hollow portion that passes through both ends thereof, and the second shell 6 is provided with a receiving groove at one end facing the first shell 2. A limiting step is provided at one end of the hollow portion of the first shell 2, and the second shell 6 is nested at one end of the hollow portion of the first shell 2 where the limiting step is provided. The second shell 6 closes one end of the hollow portion of the first shell 2, and the hollow portion of the first shell and the receiving groove of the second shell are connected to form a cavity inside the shell. With such a structure, the contact surface of the first shell 2 and the second shell 6 forms a turning structure. The contact surface between the first shell 2 and the second shell is relatively sealed. During operation, the high-pressure gas will only be discharged in small amounts through the assembly gap of the shell, which will not affect the surrounding devices of the excitation closer.

[0045] The excitation source 1 is fixedly disposed in a cavity at one end of the first shell 2, away from the second shell 6, and the excitation source 1 seals one end of the cavity of the first shell 2. The end of the excitation source 1 that releases the driving force is located within the cavity of the shell, and the end that receives the trigger signal is located outside the first shell 2. The excitation source 1 can be fixed to the first shell 2 by interference fit, by injection molding, or by providing a pressure cap on the outside of the first shell and a step in the hollow portion of the first shell, so that the excitation source is located between the step and the pressure cap to achieve excitation source fixation.

[0046] A first conductor 4 and a second conductor 5 are respectively disposed between the contact surfaces on opposite sides of the first and second shells 2 and 6. The first and second conductors 4 and 5 have a long, bent, strip-like structure. The first and second conductors 4 and 5 are disposed between the contact surfaces of the first and second shells 2 and 6 in a multiple-bend configuration. This multiple-bend configuration better secures the first and second conductors. To better position the first and second conductors, retaining grooves are provided on the sidewalls and ends where the first and second shells contact, or on the sidewalls and ends where the second shells contact the first shell. These retaining grooves prevent the first and second conductors located between the contact surfaces of the first and second shells from sliding relative to the shells. The ends of the first and second conductors 4 and 5 located outside the shells serve as connection terminals for the excitation closers and can be installed in an external circuit using methods such as bolt crimping or quick-connect terminals. The ends located outside the shells can be bent or flat, depending on the actual installation scenario. One end (4a, 5a) of the first conductor 4 and the second conductor 5 located inside the shell respectively extends into the cavity inside the shell and is suspended. One end of the first conductor 4 and the second conductor 5 in the cavity inside the shell is relatively spaced and insulated. The structural form of the one end of the first conductor 4 and the second conductor 5 in the cavity inside the shell that is relatively spaced and insulated can be of various types. The first conductor 4 and the second conductor 5 in the cavity inside the shell are bent in a hook-shaped structure in the direction away from the excitation source 1, and the bending angle (the angle with the vertical piston displacement direction) is less than 90 degrees to ensure that when the piston is displaced, the bent end of the first conductor 4 and the second conductor 5 in the cavity inside the shell can cause the piston to undergo plastic deformation. The preferred bending angle is between 10 and 60 degrees. See. Figures 7a to 7c ,in: Figure 7a It is a single-finger hook-shaped structure with relatively poor elasticity. Figure 7b It is a two-finger hook-shaped structure with a certain degree of elasticity. Figure 7c It is a three-finger hook-shaped structure, and its elasticity is higher than that of a single finger or two fingers. The first conductor 4 and the second conductor 5 are in one end of the hook-shaped structure, which allows the closed end of the piston to pass more smoothly between the first conductor and the second conductor, making the contact more reliable and preventing the piston from rebounding after deformation; through the two-finger or multi-finger hook-shaped structure, the first conductor 4 and the second conductor 5 are in multi-point contact with the piston, thereby improving the contact reliability. The piston 3 is arranged in the cavity of the first shell between the first conductor, the second conductor and the excitation source 1. The piston 3 is supported by a limiting structure arranged in the cavity of the shell to maintain its initial position. See Figure 1, a limiting column 601 is provided on the inner wall of the accommodating groove of the second shell to form a limiting structure. The limiting column 601 is located on the inner wall of the cavity of the shell beside the first conductor and the second conductor. The limiting column 601 extends into the cavity of the first shell 2 to limit the piston 3. The length of the limiting column 601 is parallel to the piston displacement path. In order to facilitate better displacement of the piston 3 when it is impacted, the end of the limiting column 601 facing the excitation source 1 is set to an inclined surface or a rounded arc surface. The number and setting method of the limiting column 601 are set based on the principle of stably supporting the piston and limiting its initial position. It can be one limiting column or multiple limiting columns.

[0047] The piston 3 is a shell-like structure with a thin shell wall, open at one end and closed at the other. For example, the piston may be a shell-like structure with a circular cross-section or a rounded rectangular cross-section. The cross-sectional area from the open end to the closed end is uniform, or the cross-sectional area decreases uniformly from the open end to the closed end, or the cross-sectional area decreases unevenly from the open end to the closed end, and there is at least one step-like structure between the open and closed ends of the piston. Examples include a cap-like structure, a cylindrical structure with one end closed, or a conical cylindrical structure with one end closed. The piston 3 is made of a conductive material and is formed by integral molding; alternatively, at least the outer circumferential surface of the piston 3 is made of a conductive material. The distance between the opposing sides of the first and second conductors at the open end of the piston 3 is greater than the minimum distance between the opposing ends of the first and second conductors in a hook-shaped structure. Preferably, the distance between the opposing sides of the first and second conductors from the open end to the closed end of the piston 3 is greater than the distance between the first and second conductors. The height of the piston 3 from the open end to the closed end is greater than the distance between the first conductor and the second conductor and the end point of the displacement of the piston 3, so that after the piston 3 undergoes plastic deformation and moves to the end position, the piston 3 is still located between the first conductor and the second conductor, so that the first conductor and the second conductor are conductive. Moreover, the distance between the first conductor and the second conductor and the end point of the displacement of the piston 3 can provide space for the piston 3 to undergo plastic deformation.

[0048] The closed end of the piston 3 is arranged in the direction of the first conductor and the second conductor, and is located on the inclined surface or the rounded arc surface of the limit column 601, and the piston 3 is supported and the initial position is limited by the limit column 601. When a step-like structure is provided on the piston 3, the limit column 601 can also be supported on the step-like structure of the piston to limit the initial position of the piston 3. The open end of the piston 3 is arranged in the direction of the excitation source 1, and the driving force release end of the excitation source 1 is located in the open end of the piston 3, and the piston 3 is positioned by the excitation source 1 and the limit column 601. In order for the piston 3 to be better supported and limited by the limit column 601, the side wall of the closed end of the piston 3 in contact with the limit column 601 is provided at a position adjacent to the bottom as a rounded arc surface. In this embodiment, refer to Figure 3 The piston 3 is a cylindrical structure with a consistent outer diameter, one end open and the other end closed.

[0049] Working principle:

[0050] When the excitation source 1 receives the trigger signal and acts, it releases high-pressure gas as a driving force. The high-pressure gas released by the excitation source 1 immediately enters the piston 3 and acts on the closed end of the piston 3, driving the piston 3 to overcome the limiting displacement of the limiting column 601. During the displacement of the piston 3, the limiting column 601 acts on the outer wall of the piston 3, leaving a straight groove on the outer wall of the piston 3 corresponding to the limiting column, ensuring that the piston 3 can make a straight displacement along the limiting column 601. When the piston 3 enters between the ends of the first conductor and the second conductor that are opposite to each other and have a hook-shaped structure, under the impact of the piston 3, the ends of the first conductor and the second conductor that have a hook-shaped structure are slightly deformed, and the piston undergoes plastic deformation under the action of the hook-shaped structure of the first conductor and the second conductor and the bottom of the cavity of the second shell, and is stuck between the first conductor and the second conductor, see Figure 2 The structure shown.

[0051] The present invention utilizes a piston 3 having a relatively thin shell structure. When the piston 3 is displaced between one end of the first and second conductors spaced apart, the piston 3 undergoes plastic deformation due to the thin shell wall of the piston 3 under the squeezing action of the ends of the hook-shaped structures of the first and second conductors. This causes the piston 3 to come into close contact with one end of the hook-shaped structures of the first and second conductors, thereby clamping the piston 3 between the first and second conductors. This allows the first and second conductors to be electrically conductive through the piston 3, and the piston 3 is positioned at its final position. Due to the close contact between the piston 3 and one end of the hook-shaped structures of the first and second conductors, the contact area is increased, ensuring the electrical conductivity reliability of the first and second conductors and reducing contact resistance.

[0052] Since one end of the hook-shaped structure of the first conductor and the second conductor has a certain degree of elasticity, when the piston 3 enters between the first conductor and the second conductor, the ends of the first conductor and the second conductor squeeze the side wall of the piston 3. At the same time, the ends of the first conductor and the second conductor are counter-squeezed by the piston 3, causing them to undergo elastic deformation. The elastic force generated by the elastic deformation acts on the side wall of the piston 3, thereby increasing the force of the first conductor and the second conductor acting on the side wall of the piston 3, making it easier for the piston 3 to undergo plastic deformation under the squeezing action, increasing the contact area, and improving contact reliability.

[0053] exist Figures 1 to 3 On the basis of the above, the structure of the piston 3 and the position of the limiting structure are changed. Figures 4 to 6, the piston 3 extends outward at the open end to form a flange structure 301. The limiting structure is a limiting column 601, which is arranged on the inner wall of the cavity of the second shell 6, and extends into the first shell 2, and is arranged in contact with the inner wall of the cavity of the first shell 2. The limiting column 601 faces one end of the excitation source 1 and is close to the high-pressure gas release end of the excitation source 1. The flange structure 301 at the open end of the piston 3 is set on the end of the limiting column 601 facing the excitation source 1 for limiting. When the excitation source 1 releases high-pressure gas as a driving force to drive the piston 3 to move, the flange structure of the piston 3 arranged at the end of the limiting column 601 is straightened to release the limit, and the piston 3 moves along the shell cavity.

[0054] In some other embodiments, a rib 9 may be provided at the bottom of the cavity of the housing, and the rib 9 may cause the closed end of the piston 9 to undergo plastic deformation. Figures 8 and 9 A rib 9 is provided at the bottom of the cavity of the second housing 6, corresponding to the closed end of the piston 3. The rib 9 protrudes from the bottom of the cavity of the second housing, and the length of the rib 9 extends through the maximum outer diameter of the closed end of the piston 3. The rib 9 is provided so as not to affect the displacement of the piston and the conduction between the first and second conductors, while allowing the closed end of the piston 3 to undergo plastic deformation. Preferably, the length of the rib 9 is provided perpendicular to the line connecting the first and second conductors, and the rib 9 is located at the center between the ends of the first and second conductors that are spaced apart from each other. At least one rib is provided.

[0055] When piston 3 reaches its final position, its two opposing side walls undergo plastic deformation under the action of the spaced ends of the first and second conductors. Simultaneously, when the closed end of piston 3 contacts rib 9, plastic deformation also occurs at the closed end of piston 3. The extent of plastic deformation at the closed end of piston 3 is determined by the height and width of rib 9 protruding from the bottom of the housing cavity. The provision of rib 9 increases the plastic deformation of piston 3, ensuring closer contact and a larger contact area between piston 3 and the first and second conductors.

[0056] Since the piston 3 needs to undergo plastic deformation when it contacts the first conductor and the second conductor, the shell wall of the piston 3 is relatively thin. When the high-pressure gas released by the excitation source acts on the piston 3, it directly acts on the closed end of the piston 3. Therefore, the impact force on the closed end of the piston 3 is the greatest, which may cause the closed end of the piston 3 to rupture.

[0057] In order to reduce the damage caused by the impact force of the high pressure gas released by the excitation source 1 to the closed end of the piston 3, a buffer gasket 10 is provided at the bottom of the closed end of the piston 3 to buffer the impact force. Figures 10 and 11, no rib 9 is provided at the bottom of the cavity of the shell, and a buffer gasket 10 is provided at the bottom inside the closed end of the piston 3. The buffer gasket 10 matches the shape of the inner side of the closed end. The buffer gasket 10 has a certain thickness covering the bottom surface inside the closed end of the piston 3. The buffer gasket 10 is set to a relatively soft material that can absorb energy. The buffer gasket 10 absorbs part of the impact energy through its own deformation, thereby achieving the effect of buffering the impact force. At the same time, due to the buffering of the buffer gasket, the piston 3 can be subjected to force more evenly, avoiding the rupture of the piston 3. In addition, since the buffer gasket is relatively soft, it will not hinder the deformation of the piston 3. In this embodiment, the material of the buffer gasket 10 is a silicone gasket. See Figure 11 A buffer gasket 10 is provided at the bottom of the closed end of the piston 3. When the piston 3 moves to the end position, the two ends of the buffer gasket 10 adjacent to the side wall of the piston 3 will be deformed, so that the two ends of the buffer gasket 10 are located between the plastically deformed side wall and the bottom of the closed end of the piston 3.

[0058] A buffer gasket 10 is provided in the closed end of the piston 3. It should be noted that the thickness of the buffer gasket 10 should not affect the plastic deformation of the side wall of the piston 3; when the rib 9 is provided, the thickness and softness of the buffer gasket 10 should not affect the plastic deformation of the side wall and the closed end of the piston 3. Figures 12 to 13 A rib 9 is provided at the bottom of the cavity of the second housing 6, and a buffer gasket 10 is provided at the bottom of the closed end of the piston 3. Figure 13 When the piston 3 moves to the end position, the first conductor 4, the second conductor 5 and the rib 9 cause the side wall and the closed end of the piston 3 to undergo plastic deformation. Since the buffer gasket 10 is made of a relatively soft material, the buffer gasket 10 deforms along with the plastic deformation of the piston 3. The two ends of the buffer gasket 10 are clamped and fixed by the plastically deformed side wall of the piston 3 and the bottom of the closed end, thereby preventing the buffer gasket 10 from flying out of the piston 3.

Claims

1. An excitation closer for improving closing reliability, characterized in that: The device comprises: a housing, a first conductor, a second conductor, a piston, and an excitation source; the housing is provided with a cavity, the first conductor and the second conductor are respectively arranged in the housing in an insulated manner, one end of the first conductor and the second conductor located in the cavity of the housing are spaced relative to each other and insulated, the excitation source and the piston are respectively arranged in the cavity, the piston is a shell-like structure with one end open and the other end closed, and at least the outer peripheral surface of the piston is made of a conductive material; The open end of the piston is arranged toward the end where the driving force of the excitation source is released, and the closed end of the piston is arranged corresponding to the end where the first conductor and the second conductor are relatively spaced apart, and the initial position of the piston is limited by a limiting structure; the excitation source can be actuated according to the received trigger signal, releasing the driving force to drive the piston to move toward the first conductor and the second conductor, and the closed end of the piston passes between the ends where the first conductor and the second conductor are relatively spaced apart, and the ends where the first conductor and the second conductor are relatively spaced apart contact with the outer peripheral surface of the piston to cause plastic deformation of the piston, and the piston is stuck between the ends where the first conductor and the second conductor are relatively spaced apart in a plastic deformation manner, so that the first conductor and the second conductor are conductive.

2. The energizing closer according to claim 1, characterized in that One end of the first conductor and the second conductor located in the cavity of the shell and spaced apart from each other is bent and tilted in a direction away from the excitation source to form a hook-shaped structure.

3. The energizing closer according to claim 2, characterized in that One end of the hook-shaped structure of the first conductor and the second conductor respectively has a multi-finger structure.

4. The energizing closer according to claim 2, characterized in that The bending angle of one end of the first conductor and the second conductor in the hook-shaped structure is between 10 degrees and 60 degrees.

5. The energized closer according to claim 1, characterized in that The piston is a shell-like structure with a circular cross-section or a rounded rectangular cross-section. The cross-sectional area from the open end to the closed end of the piston is uniform, or the cross-sectional area from the open end to the closed end of the piston decreases uniformly, or the cross-sectional area from the open end to the closed end of the piston decreases unevenly, and there is at least one step-like structure between the open end and the closed end of the piston.

6. The energizing closer according to claim 5, characterized in that The limiting structure is at least one limiting column arranged in the housing.

7. The energizing closer according to claim 6, characterized in that A rounded arc surface is provided on the outer periphery of the closed end of the piston or the stepped structure of the piston, and the limiting column supports the rounded arc surface. The supporting surface of the limiting column is an inclined surface or a rounded arc surface.

8. The energizing closer according to claim 6, characterized in that The open end of the piston is provided with a flange structure, and the limiting column supports the flange structure of the piston.

9. The energizing closer according to any one of claims 1 to 8, characterized in that: A convex rib is provided at the bottom of the housing cavity away from the excitation source, corresponding to the center radial line of the closed end of the piston. When the piston moves to the end position, the convex rib causes the closed end of the piston to undergo plastic deformation.

10. The energized closer according to claim 9, characterized in that A buffer gasket is provided at the bottom inside the closed end of the piston.

11. The energizing closer according to any one of claims 1 to 8, characterized in that: A buffer gasket is provided at the bottom inside the closed end of the piston.

12. The energizing closer according to any one of claims 1 to 8, characterized in that: The shell includes a first shell and a second shell, the first shell is provided with a through hollow part, the second shell is nested in one end of the hollow part of the first shell to close the end of the first shell, and the excitation source is provided at the other end of the hollow part of the first shell to close the other end of the shell; the second shell is provided with a accommodating groove toward one end of the first shell, the accommodating groove and the hollow part of the first shell are connected to form the cavity of the shell, the first conductor and the second conductor are respectively arranged between the contact surfaces on the opposite sides of the first shell and the second shell, and the piston is located in the hollow part of the first shell; the limiting structure is located on the inner wall of the accommodating groove of the second shell, and extends into the first shell to form an initial position limit for the piston.

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