Circuit rapid cut-off device

Abstract

A circuit rapid cut-off device. The circuit rapid cut-off device comprises a housing (100), an igniter (10), a piston (20), an arc extinguishing body (31) and a conductor (40) being provided in the housing (100). The igniter (10), the piston (20), and the arc extinguishing body (31) are arranged in the housing (100), and the conductor (40) passes through the housing (100), the igniter (10) and the piston (20) being located on a same side of the conductor (40), and the arc extinguishing body (31) being arranged on the other side of the conductor (40). The igniter (10) can drive the piston (20) to move in a direction close to the arc extinguishing body (31) to a blocking state, such that the piston (20) cuts part of the conductor (40) to form a broken piece (41); in the blocking state, the fracture portion of the broken piece (41) is pressed by the piston (20) to be inserted into the arc extinguishing body (31).

Description

Circuit quick disconnect device

[0001] Related applications

[0002] This application claims priority to Chinese patent application number 202310801233.0, filed on June 30, 2023, entitled “Circuit Quick Disconnect Device,” the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the technical field of power-related technologies, and in particular to a circuit rapid disconnection device. Background Art

[0004] Circuit disconnect devices are used to quickly disconnect circuits and achieve insulation when encountering safety issues. In order to improve arc extinguishing capabilities, some circuit disconnect devices often adopt the addition of arc extinguishing media (such as metal wires, arc extinguishing grids, etc.) or increase cutting openings. The arc extinguishing media of the former can extinguish the arc it contacts, thereby achieving the effect of rapid arc extinguishing, and the latter can cut off part of the conductor to increase the current breaking capacity.

[0005] However, after the conductor fragment cut off by the circuit disconnecting device comes into contact with the arc extinguishing medium, the arc carried by the fragment may be transmitted to the arc extinguishing medium through the contact surface between the fragment and the arc extinguishing medium. If the arc is transmitted to the arc extinguishing medium and then comes into contact with the metal powder generated when the conductor is cut off, there is a risk of arc reignition, which will lead to a decrease in insulation capacity and may even cause the current disconnecting device to explode. 。

[0006] Summary of the Invention

[0007] According to various embodiments of the present application, a circuit rapid disconnect device is provided.

[0008] The present application provides a circuit quick-disconnect device, comprising a housing, an igniter, a piston, at least one arc-extinguishing body, and a conductor, wherein the igniter, the piston, and the at least one arc-extinguishing body are arranged in the housing, the conductor passes through the housing, the igniter and the piston are located on the same side of the conductor, and the at least one arc-extinguishing body is arranged on the other side of the conductor; the igniter can drive the piston to move toward the at least one arc-extinguishing body to a blocking state, so that the piston can cut off part of the conductor to form fragments; in the blocking state, the broken end of the fragment is inserted into the at least one arc-extinguishing body under the pressure of the piston.

[0009] In one embodiment, an arc extinguishing chamber is further provided in the shell, the arc extinguishing body is arranged in the arc extinguishing chamber, and the arc extinguishing chamber has a guide surface inclined relative to the movement direction of the piston, and the fragment is deflected by the fragment being against the guide surface.

[0010] In one embodiment, a receiving chamber is provided on a side of the piston close to the conductor, and the fragment is received in the receiving chamber; in a blocking state, the arc extinguishing body abuts against the piston to block the receiving chamber.

[0011] In one embodiment, a blocking surface is provided in the accommodating chamber. In a blocking state, the blocking surface abuts against one of the cross sections of the fragment along the movement direction of the piston.

[0012] In one embodiment, the piston has a columnar portion at one end close to the arc-extinguishing body.

[0013] In one embodiment, a protrusion is fixedly provided in the arc extinguishing chamber, the guide surface is the side surface of the protrusion, and the accommodating chamber includes an interlocking cavity corresponding to the protrusion. In the blocking state, the protrusion is inserted into the interlocking cavity and fits with its inner wall.

[0014] In one embodiment, the accommodating chamber further includes a fragment accommodating chamber opened on the inner wall of the interlocking cavity, and the blocking surface is the inner wall of the fragment accommodating chamber on one side close to the ignition device. In the blocking state, the fragment is accommodated in the fragment accommodating chamber.

[0015] In one embodiment, a protrusion that can be inserted into the accommodating chamber is fixedly provided in the arc extinguishing chamber, and the protrusion has a cutting edge so as to cut the portion of the conductor cut off by the piston into multiple fragments when the piston moves toward the arc extinguishing body.

[0016] In one embodiment, a protrusion is fixedly provided in the arc extinguishing chamber to cut the portion of the conductor cut off by the piston into two segments.

[0017] In one embodiment, in the blocking state, the protrusion abuts against the inner wall of the accommodating chamber to divide the accommodating chamber into a plurality of mutually isolated fragment accommodating cavities, each of which accommodates one fragment.

[0018] The details of one or more embodiments of the present application are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the present application will become apparent from the description, drawings, and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to better describe and illustrate the embodiments and / or examples of the inventions disclosed herein, reference may be made to one or more of the accompanying drawings. The additional details or examples used to describe the accompanying drawings should not be considered to limit the scope of the disclosed inventions, the presently described embodiments and / or examples, and any of the best modes currently understood for these inventions.

[0020] FIG1 is a schematic diagram of a cross-sectional structure of the circuit quick disconnect device of the present application in the initial state viewed from the front.

[0021] FIG2 is a schematic diagram of the cross-sectional structure of the circuit quick disconnect device of the present application in the blocking state, with one of the arc extinguishing bodies hidden and viewed from the front.

[0022] FIG3 is a schematic diagram of the three-dimensional structure of the lower shell in FIG1 .

[0023] FIG4 is an enlarged structural schematic diagram of the lower housing in FIG1 .

[0024] FIG5 is a schematic diagram of the three-dimensional structure of the piston in FIG1 .

[0025] FIG6 is an enlarged structural schematic diagram of the piston in FIG1 .

[0026] Figure numerals: 100, shell; 110, upper shell; 120, conductor fixing member; 121, through hole; 130, lower shell; 10, igniter; 20, piston; 21, accommodating chamber; 21a, fragment accommodating chamber; 211a, blocking surface; 21b, interlocking chamber; 22, columnar portion; 23, cutting portion; 23a, first cutting portion; 23b, second cutting portion; 231, cutting edge; 24, piston avoidance groove; 30, arc extinguishing chamber; 31, arc extinguishing body; 32, partition assembly; 321, protrusion; 321a, guide surface; 321b, cutting edge; 322, partition; 322a, partition avoidance groove; 40, conductor; 41, fragment. DETAILED DESCRIPTION

[0027] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0030] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0031] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0032] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0033] Please refer to Figures 1 and 2. The present application provides a circuit quick-disconnecting device, including a shell 100, in which an ignition device 10, a piston 20, an arc extinguishing body 31 and a conductor 40 are arranged. The conductor 40 passes through the shell 100, and the ignition device 10 and the piston 20 are located on the same side of the conductor 40, and the arc extinguishing body 31 is arranged on the other side of the conductor 40; the ignition device 10 can drive the piston 20 to move toward the arc extinguishing body 31 to a blocking state, so as to cut off part of the conductor 40 through the piston 20 to form a fragment 41; in the blocking state, the broken end of the fragment 41 is inserted into the arc extinguishing body 31 under the pressure of the inner wall of the accommodating chamber 21.

[0034] The blocking state herein refers to the state in which the ignition device 10 drives the piston 20 to move to the extreme position of the circuit quick disconnecting device, at which time part of the conductor 40 is cut off by the piston 20 to disconnect the circuit.

[0035] Specifically, the conductor 40 has a pre-designed weak position. The ignition device 10 drives the piston 20 to move toward the arc extinguishing body 31, and the piston 20 impacts the weak position, thereby cutting off part of the conductor 40, forming an isolated insulating fracture with a certain distance, so as to achieve the effect of cutting off the circuit.

[0036] In the present application, as the piston 20 moves toward the arc extinguishing body 31 , the piston 20 can squeeze the arc carried by the fragment 41 onto the arc extinguishing body 31 to extinguish the arc, thereby improving the insulation of the circuit rapid disconnecting device.

[0037] It should be noted that after the fragment 41 contacts the arc extinguishing body 31, the arc may be conducted to the metal arc extinguishing body 31 through the contact surface. If the arc is conducted to the arc extinguishing body 31 and then contacts the metal powder generated when the conductor 40 is cut off, there is a possibility of reigniting the arc. Therefore, in order to reduce the risk of reignition of the arc, it is necessary to reduce the contact area between the fragment 41 and the arc extinguishing body 31.

[0038] In the present application, the broken end of the fragment 41 is inserted into the arc extinguishing body 31 in the blocking state. Compared with the scheme in the related art that the fragment of the circuit cutting device falls directly onto the arc extinguishing body and the larger side of the fragment is offset against the arc extinguishing body under the action of its own weight, the present application inserts the smaller broken end of the fragment 41 into the arc extinguishing body 31 by plugging, thereby reducing the contact area between the fragment 41 and the arc extinguishing body 31, reducing the possibility of the arc being conducted to the arc extinguishing body 31, thereby reducing the risk of the arc reigniting, and further improving the insulation capacity of the circuit rapid cutting device.

[0039] In addition, the fracture area of ​​the fragment 41 is relatively small, and the force area of ​​the fragment 41 when inserted into the arc extinguishing body 31 is relatively small. The fragment 41 is easier to insert into the arc extinguishing body 31, and the requirements for the ignition device 10 are relatively low.

[0040] In some embodiments, the arc extinguishing body 31 is a metal wire or other breathable material capable of extinguishing an arc, which is not further limited in this application.

[0041] Please refer to Figures 3 and 4. In some embodiments, an arc extinguishing chamber 30 is further provided in the shell 100. The arc extinguishing body 31 is arranged in the arc extinguishing chamber 30. The arc extinguishing chamber 30 has a guide surface 321a inclined relative to the movement direction of the piston 20. The fragment 41 is deflected by abutting against the guide surface 321a so as to enable the fragment 41 to move approximately along the movement direction of the piston 20.

[0042] The guide surface 321 a here can be the inner wall of the arc extinguishing chamber 30 or other chambers, or the side of any part protruding from the arc extinguishing chamber 30 or other chambers, as long as it can be used to abut against and deflect the fragment 41 .

[0043] Specifically, the guide surface 321a at least partially corresponds to the fragment 41 along the movement direction of the piston 20, so that after the fragment 41 is cut off from the conductor 40, it falls to the guide surface 321a under its own weight and the pushing action of the piston 20, and is flipped under the guidance of the guide surface 321a to fit the guide surface 321a (that is, the fracture is facing the arc extinguishing body 31), thereby ensuring that the fracture of the fragment 41 can be inserted into the arc extinguishing body 31.

[0044] Of course, other limiting members or guide members may be provided to change the orientation of the fragment 41 , as long as the broken end of the fragment 41 can be at least partially inserted into the arc extinguishing body 31 in the blocking state. This application does not make any further limitations here.

[0045] 5 and 6 , in some embodiments, a receiving chamber 21 is provided on a side of the piston 20 close to the conductor 40 , and the fragment 41 is received in the receiving chamber 21 ; in the blocking state, the arc extinguishing body 31 abuts against the piston 20 to block the receiving chamber 21 .

[0046] The arc extinguishing body 31 and the piston 20 block the fragment 41 in the accommodating chamber 21 . The blocking design can further reduce the possibility of arc leakage, thereby improving the insulation performance of the circuit rapid disconnection device.

[0047] In some embodiments, the angle between the guide surface 321a and the movement direction of the piston 20 ranges from 0° to 20°; it can be understood that the larger the angle between the guide surface 321a and the movement direction of the piston 20, the larger the angle between the fragment 41 and the movement direction of the piston 20 after it is offset against the guide surface 321a, and the larger the contact area between the fragment 41 and the arc extinguishing body 31 after it is inserted into the arc extinguishing body 31, which is not conducive to improving the insulation of the device, and the more difficult it is to insert the fragment 41 into the arc extinguishing body 31. After corresponding calculations and experimental verification, it is found that when the angle range is between 0° and 20°, the impact force of the ignition device 10 can meet the requirements of the fragment 41 inserting into the arc extinguishing body 31.

[0048] Please refer to Figures 5 and 6. In some embodiments, the piston 20 has a columnar portion 22 at one end close to the arc extinguishing body 31. Since the fragment 41 is accommodated in the accommodating chamber 21 in the blocking state, it can be understood that in order to insert the fragment 41 into at least one arc extinguishing body 31, it is necessary to partially insert the piston 20 into the arc extinguishing body 31, and a columnar portion 22 is provided at one end of the piston 20 close to at least one arc extinguishing body 31. The columnar portion 22 can reduce the force-bearing area of ​​the bottom end of the piston 20 to facilitate the insertion of the piston 20 into at least one arc extinguishing body 31.

[0049] In some embodiments, the width of the fragment 41 is smaller than the width of other parts of the conductor 40. In the initial state, the fragment 41 is just stuck between the two columnar parts 22 to facilitate the installation fool-proof effect, ensuring that after the piston 20 is installed, the cutting edge 231 of the piston 20 just corresponds to the weak position on the conductor 40.

[0050] In some embodiments, in the blocking state, the depth of the piston 20 inserted into the arc extinguishing body 31 is less than or equal to 3 mm; the insertion of the piston 20 into the arc extinguishing body 31 can, on the one hand, completely isolate the fragment 41 in the corresponding fragment accommodating cavity 21 a through the piston 20 and the arc extinguishing body 31 to improve the insulation performance of the device, and on the other hand, it can also play a certain buffering effect. Calculations and experimental verifications show that when the insertion depth of the piston 20 is less than or equal to 3 mm, the buffering effect and arc extinguishing effect of the piston 20 are best.

[0051] As shown in Figures 5 and 6 , in some embodiments, the piston 20 has two cutting portions 23 on the side closest to the conductor 40: a first cutting portion 23a and a second cutting portion 23b. The accommodating chamber 21 is located between the first and second cutting portions 23a, 23b. Both the first and second cutting portions 23a, 23b have cutting edges 231. Specifically, the cutting edges 231 are located at the end of the first cutting portion 23a away from the second cutting portion 23b, and the cutting edges 231 are located at the end of the second cutting portion 23b away from the first cutting portion 23a. The columnar portion 22 protrudes from the end surface where the cutting edges 231 are located, toward the arc-extinguishing element 31.

[0052] By arranging the cutting edge 231 at the edge of the first cutting portion 23a away from the second cutting portion 23b, the distance between the two weak positions of the conductor 40 is increased as much as possible, thereby increasing the distance between the isolated insulating ports after the fragment 41 is cut off, thereby improving the insulation effect.

[0053] Please refer to Figures 2 and 3. In some embodiments, a partition assembly 32 is fixedly provided in the arc extinguishing chamber 30. The partition assembly 32 includes a protrusion 321. The guide surface 321a is the side surface of the protrusion 321. The accommodating chamber 21 includes an interlocking cavity 21b corresponding to the protrusion 321. In the blocking state, the protrusion 321 is inserted into the interlocking cavity 21b and fits against the inner wall of the interlocking cavity 21b, so that the protrusion 321 and the inner side wall of the accommodating chamber 21 vertically clamp the fragment 41.

[0054] The vertical clamping here refers to clamping the fragment 41 when the broken end of the fragment 41 is facing or away from the igniter 10. At this time, the protrusion 321 and the inner side wall of the accommodating chamber 21 respectively abut against a pair of end faces of the fragment 41 facing or away from the igniter 10 when it is not cut off.

[0055] It should be noted that in order to improve the arc extinguishing capability, traditional partial circuit disconnecting devices often adopt the method of adding arc extinguishing media (such as metal wire, arc extinguishing grid, etc.) or adding cutting openings to achieve rapid arc extinguishing. However, such methods often require a larger arc extinguishing space, resulting in a larger device size, which cannot be applied to the miniaturization requirements of circuit disconnecting devices in fields such as new energy vehicles.

[0056] In the present application, the vertical fragment 41 can be clamped and accommodated between the guide surface 321a of the protrusion 321 and the inner wall of the accommodating chamber 21. Since the thickness of the fragment 41 is relatively small, accommodating the fragment 41 in this way can reduce the requirement for the diameter of the shell 100, thereby minimizing the overall volume of the circuit quick disconnect device.

[0057] In addition, on the one hand, in the blocking state, the cutting portion 23 is isolated between the fragment 41 and the conductor 40 to weaken and block the arc between the two, thereby further improving the current breaking capacity of the circuit fast disconnecting device of the present application;

[0058] On the other hand, in the blocking state, the protrusion 321 is inserted into the interlocking cavity 21b and interlocked with the interlocking cavity 21b, which can minimize the gap between the protrusion 321 and the piston 20. It can not only reduce the possibility of arc leakage through the gap, but also improve the space utilization inside the shell 100, and further reduce the volume of the circuit quick disconnection device.

[0059] Please refer to Figure 6. In some embodiments, a blocking surface 211a is provided in the accommodating chamber 21. In the blocking state, the blocking surface 211a is against one of the cross-sections of the fragment 41 along the movement direction of the piston 20, so that when the piston 20 moves toward at least one arc-extinguishing body 31, the fragment 41 is pressed into the arc-extinguishing body 31 through the blocking surface 211a.

[0060] Please refer to Figures 2 and 6. In some embodiments, the accommodating chamber 21 also includes a fragment accommodating chamber 21a opened on the inner wall of the interlocking cavity 21b and / or the protrusion 321. The fragment accommodating chamber 21a corresponds one-to-one with the fragment 41. The blocking surface 211a is the inner wall of the fragment accommodating chamber 21a on one side close to the ignition device 10. In the blocking state, the fragment 41 is accommodated in the corresponding fragment accommodating chamber 21a, and a pair of end faces of the fragment 41 respectively abut against the protrusion 321 and the inner wall of the fragment accommodating chamber 21a.

[0061] Taking the fragment accommodating cavity 21a opened in the piston 20 as an example, by opening the fragment accommodating cavity 21a in the piston 20, the fragment 41 is embedded in the piston 20, and the piston 20, the fragment 41 and the protrusion 321 are tightly fitted in the blocking state. On the one hand, it can increase space utilization and reduce the volume of the device. On the other hand, the tight fit between the components can also reduce the possibility of arc leakage carried by the fragment 41, thereby improving the insulation performance of the device.

[0062] In some embodiments, the side surface of the protrusion 321 can be interference fit with the inner wall of the interlocking cavity 21b to isolate each fragment accommodating cavity 21a; through the interference fit between the protrusion 321 and the inner wall of the interlocking cavity 21b, the arcs carried by the fragments 41 in different fragment accommodating cavities 21a can be prevented from being mutually conductive through the gap between the protrusion 321 and the inner wall of the interlocking cavity 21b, thereby increasing the insulation effect of the device.

[0063] In some embodiments, the partition assembly 32 includes at least one protrusion 321 and at least one partition 322; the partition 322 can separate the arc extinguishing chamber 30 into multiple arc extinguishing cavities 30a, and each arc extinguishing cavity 30a is provided with a mutually independent arc extinguishing body 31; the protrusion 321 has at least one cutting edge 321b, so that when the piston 20 moves toward the direction close to at least one arc extinguishing body 31, the part of the conductor 40 cut off by the piston 20 is cut into multiple fragments 41, and each fragment 41 corresponds to an arc extinguishing cavity 30a and a fragment accommodating cavity 21a; in the blocking state, the piston 20, the partition assembly 32 and the arc extinguishing body 31 jointly isolate the fragment 41 in the corresponding fragment accommodating cavity 21a, and the fragment accommodating cavity 21a is at least partially located in the corresponding arc extinguishing cavity 30a.

[0064] By dividing the portion of the conductor 40 cut off by the piston 20 into multiple fragments 41, the volume of each fragment 41 can be reduced, the amount of arc carried by the fragment 41 can be reduced, and the possibility of arc leakage can be reduced; in addition, by arranging independent arc extinguishing bodies 31 in each arc extinguishing cavity 30a and isolating each fragment 41 in the corresponding arc extinguishing cavity 30a, the arc carried by the fragment 41 can be prevented from being mutually conducted through the metal arc extinguishing body 31, further reducing the possibility of arc reignition and leakage, thereby achieving the effect of increasing the insulation effect of the device.

[0065] 3 and 5 , in some embodiments, one or more partition assemblies 32 are fixedly provided in the arc extinguishing chamber 30, and each group of partition assemblies 32 includes a protrusion 321 and a partition 322 to separate the arc extinguishing chamber 30 into two arc extinguishing chambers 30a, and the protrusion 321 has a cutting edge 321b and two guide surfaces 321a located on both sides of the cutting edge 321b, and the cutting edge 321b can cut the portion of the conductor 40 cut off by the piston 20 into two fragments 41.

[0066] The conductor portion 40 cut off by the piston 20 also has a weak position corresponding to the cutting edge 321 b , and the cut conductor portion 40 is cut off by the cutting edge 321 b , thereby cutting the cut conductor portion 40 into two fragments 41 .

[0067] In one / multiple embodiments, the weak position corresponding to the cutting edge 321b is located at the center position of the portion of the conductor 40 cut off by the piston 20, so that the two fragments 41 after cutting are equal in length, ensuring that both fragments 41 can be inserted into the arc extinguishing body 31 to increase the insulation performance of the device. At the same time, it can also avoid the situation where the required accommodation space increases due to the length of one of the fragments 41 being too long, thereby reducing the volume of the device.

[0068] Please refer to Figure 1. In some embodiments, in the initial state, the cutting edge 231 and the cutting edge 321b are respectively against the two end faces of the conductor 40; on the one hand, when the ignition device 10 is ignited, the piston 20 can immediately cut off the corresponding weak position through the cutting edge 231, thereby forming an isolated insulating fracture between the conductors 40 and completing the circuit cutting. On the other hand, after the piston 20 cuts off part of the conductor 40 and moves further downward, the part of the conductor 40 rotates around the cutting edge 321b under the squeezing action of the piston 20. At this time, the fracture of the fragment 41 will move away from the fracture of the conductor 40 at a faster speed, and the cutting portion 23 will block the fracture between the fragment 41 and the conductor 40 to weaken and block the arc and enhance the insulation performance.

[0069] Please refer to Figure 1. In some embodiments, the shell 100 includes an upper shell 110, a conductor fixing member 120 and a lower shell 130 that can be fixed to each other. The conductor 40 is fixed to the conductor fixing member 120. The arc extinguishing chamber 30 is opened in the lower shell 130. The conductor fixing member 120 is provided with a through hole 121. The piston 20 can slide with the inner wall of the through hole 121, and the protrusion 321 is partially located in the through hole 121.

[0070] The through hole 121 and the piston 20 are in sliding cooperation, so that when the piston 20 cuts the fragment 41 from the conductor 40 , the piston 20 is inserted into the through hole 121 and forms a narrow gap with the through hole 121 to weaken the arc immediately.

[0071] Referring to FIG. 3 , in some embodiments, the end surface of the lower housing 130 close to the conductor fixing member 120 is flush with the partition 322 .

[0072] It can be understood that in order to ensure the insulation performance of the device, the conductor fixing part 120 needs to be tightly fitted with the end face of the lower shell 130 and the partition 322 respectively, wherein the conductor fixing part 120 and the end face of the lower shell 130 are tightly pressed against each other to prevent the arc from leaking through the gap between the two, and the conductor fixing part 120 and the partition 322 are tightly pressed against each other to ensure that the partition 322 separates the arc extinguishing chamber 30 into multiple arc extinguishing cavities 30a, preventing the arcs carried by the fragments 41 in different arc extinguishing cavities 30a from conducting to each other.

[0073] Therefore, by making the partition 322 flush with one end face of the conductor fixing part 120, it is only necessary to ensure that the end face of the conductor fixing part 120 close to the lower shell 130 is flat, so that a close fit with the lower shell 130 and the partition 322 can be achieved at the same time, reducing the design and processing difficulty of the conductor fixing part 120.

[0074] Of course, the partition 322 can also protrude or recess relative to the end face of the lower shell 130, as long as the conductor fixing member 120 has a recessed portion or a protruding portion corresponding to the partition 322, so that the conductor fixing member 120 can fit tightly with both the end face of the lower shell 130 and the partition 322.

[0075] Please refer to Figures 1 and 3. In some embodiments, the end surface of the lower shell 130 close to the conductor fixing member 120, the arc-extinguishing body 31 and the partition 322 are flush, and at least one of the partition 322 and the piston 20 is provided with an avoidance groove corresponding to the other, so that the end of the piston 20 close to the arc-extinguishing body 31 can be inserted into the arc-extinguishing body 31, thereby avoiding interference between the piston 20 and the partition 322 during the insertion process of the arc-extinguishing body 31.

[0076] The arc extinguishing body 31 is flush with the end face of the lower shell 130 close to the conductor fixing piece 120 to ensure that the arc extinguishing body 31 is tightly fitted with the end face of the lower shell 130 close to the conductor fixing piece 120, thereby preventing the arc from leaking from the gap between the lower shell 130 and the conductor fixing piece 120, thereby increasing the insulation strength of the device.

[0077] In one or more embodiments, the partition 322 and the piston 20 are each provided with a corresponding avoidance groove to allow the two to be plugged into each other; specifically, the partition 322 is provided with a partition avoidance groove 322a, and the piston 20 is provided with a piston avoidance groove 24.

[0078] When the avoidance groove is only provided on one of the partition 322 or the piston 20, the requirement for assembly accuracy is relatively high: taking the case where only the partition 322 is provided with the partition avoidance groove 322a, as the piston 20 moves toward the arc extinguishing body 31, if the piston 20 shakes or deflects along its own radial direction, the piston 20 will interfere with the partition 322 and cannot be inserted into the partition avoidance groove 322a. Although increasing the width of the partition avoidance groove 322a along the radial direction of the piston 20 can reduce the requirements for processing and assembly accuracy, it will cause a gap between the piston 20 and the partition avoidance groove 322a in the blocking state, which is not conducive to improving the insulation performance.

[0079] On the contrary, taking the case where only the piston 20 is provided with the piston avoidance groove 24 as an example, as the piston 20 moves toward the arc extinguishing body 31, if the piston 20 is deflected along its own circumferential direction, the partition 322 will interfere with the piston 20 and cannot be inserted into the piston avoidance groove 24. Although increasing the width of the piston avoidance groove 24 along the circumferential direction of the piston 20 can reduce the requirements for processing and assembly accuracy, it will also cause a gap between the piston 20 and the partition avoidance groove 322a in the blocking state, which is also not conducive to improving the insulation performance.

[0080] In the above embodiment, avoidance grooves corresponding to one another are provided on the partition 322 and the piston 20, so that when the piston 20 moves toward the arc extinguishing body 31, the piston avoidance groove 24 and the partition avoidance groove 322a are plugged into each other. The avoidance space during the plugging process is larger than that of the single avoidance groove solution. The piston 20 has a certain amount of movable reserve along its own radial direction and circumferential direction. As long as the offset or deflection of the piston 20 does not exceed the reserve, the plugging can be completed normally, which effectively reduces the requirements for the processing and assembly accuracy of the device.

[0081] In some embodiments, the depth of the piston avoidance groove 24 is equal to that of the partition avoidance groove 322a; it can be understood that the piston avoidance groove 24 and the partition avoidance groove 322a obtain a two-way activity reserve by relying on mutual plugging. If the depths of the piston avoidance groove 24 and the partition avoidance groove 322a are different, then when the movement stroke of the piston 20 exceeds the avoidance groove with a smaller depth after the plugging begins, the actual plugging effect at this time is the same as the single avoidance groove solution, and only the avoidance groove with a larger depth can provide a one-way activity reserve for the piston 20.

[0082] By setting the depth of the piston avoidance groove 24 and the partition avoidance groove 322a to be equal, when the total depth of the piston avoidance groove 24 and the partition avoidance groove 322a is constant, the stroke of the piston 20 with a two-way movable reserve during the plug-in process can be maximized, thereby avoiding interference between the piston 20 and the partition 322 as much as possible, and effectively reducing the requirements for the processing and assembly accuracy of the device.

[0083] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0084] The above-described embodiments merely illustrate several implementations of the present invention. While the descriptions of the implementations are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A circuit quick disconnect device, characterized in that: It comprises a shell, an ignition tool, a piston, an arc extinguishing body and a conductor, wherein the ignition tool, the piston and the arc extinguishing body are arranged in the shell, the conductor passes through the shell, the ignition tool and the piston are located on the same side of the conductor, and the arc extinguishing body is arranged on the other side of the conductor; The igniter can drive the piston to move toward the arc extinguishing body to a blocking state, so that the piston can cut off part of the conductor to form fragments; In the blocking state, the broken end of the fragment is inserted into the arc extinguishing body under the pressure of the piston.

2. The circuit quick disconnect device according to claim 1, wherein: An arc extinguishing chamber is also provided in the shell, the arc extinguishing body is arranged in the arc extinguishing chamber, the arc extinguishing chamber has a guide surface inclined relative to the movement direction of the piston, and the fragment is deflected by the fragment abutting against the guide surface.

3. The circuit quick disconnect device according to claim 2, wherein: A receiving chamber is provided on a side of the piston close to the conductor, and the fragment is received in the receiving chamber; in a blocking state, the arc extinguishing body abuts against the piston to block the receiving chamber.

4. The circuit quick disconnect device according to claim 3, wherein: The accommodation chamber is provided with a blocking surface, and in a blocking state, the blocking surface abuts against one of the cross sections of the fragment along the moving direction of the piston.

5. The circuit quick disconnect device according to claim 4, wherein: The piston has a columnar portion at one end close to the arc-extinguishing body.

6. The circuit quick disconnect device according to claim 4, wherein: A protrusion is fixedly provided in the arc extinguishing chamber, the guide surface is a side surface of the protrusion, and the accommodating chamber includes an interlocking cavity corresponding to the protrusion. In the blocking state, the protrusion is inserted into the interlocking cavity and fits with the inner wall thereof.

7. The circuit quick disconnect device according to claim 6, wherein: The accommodating chamber also includes a fragment accommodating cavity opened on the inner wall of the fitting cavity, and the blocking surface is an inner wall of the fragment accommodating cavity on one side close to the igniter. In the blocking state, the fragment is accommodated in the fragment accommodating cavity.

8. The circuit quick disconnect device according to claim 3, wherein: A protrusion that can be inserted into the accommodating chamber is fixedly provided in the arc extinguishing chamber, and the protrusion has a cutting edge so as to cut the conductor cut off by the piston into a plurality of fragments when the piston moves toward the arc extinguishing body.

9. The circuit quick disconnect device according to claim 8, wherein: The arc extinguishing chamber is provided with a protrusion to cut the conductor cut off by the piston into two fragments.

10. The circuit quick disconnect device according to claim 8, wherein: In the blocking state, the protrusion abuts against the inner wall of the accommodating chamber to divide the accommodating chamber into a plurality of mutually isolated fragment accommodating chambers, each of which accommodates one fragment.

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