Rapid circuit cut-off device

Abstract

The invention relates to a rapid circuit cut-off device which comprises a shell, an igniter, a piston and a conductor are arranged in the shell, the conductor penetrates through the shell, the igniter and the piston are located on the same side of the conductor, and two cut-off parts are arranged on the side, close to the conductor, of the piston. Each cutting-off part is provided with a cutting-off cutting edge, and the cutting-off cutting edge is located at the end, away from the other cutting-off part, of the cutting-off part. The igniter can drive the piston to move in the direction away from the igniter so that part of the conductor can be cut off through the cutting-off cutting edge to form fragments. The cutting edge is arranged at one end, far away from the other cutting part, of the cutting part, so that the distance between two weak positions of the conductor is increased as much as possible, the length of an isolated insulation port after the fragment is cut is increased, and the expected current segmentation capability and the insulation effect are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power-related technology, and in particular to a circuit quick-cutting device. Background Art

[0002] Circuit disconnecting devices are used to quickly disconnect circuits and achieve insulation when encountering safety problems. Currently, circuit disconnecting devices can be divided into traditional fuses and excitation-triggered fuses.

[0003] The former is a stable product with high expected current segmentation capability. However, under low overload current conditions, the distance between the disconnected fractures is small and irregular, and there is a possibility of failure due to insufficient insulation strength. The latter is a device that breaks the electronic circuit after being triggered by an electronic signal. It can obtain a wide expected design space fracture, thereby improving insulation strength, but the expected current breaking capability is not high.

[0004] Currently, some excitation-triggered fuses use a method of adding a cut-off opening to cut off part of the conductor or divide it into multiple sections to increase the current segmentation capability, but its current breaking capacity is still relatively low. Summary of the invention

[0005] Based on this, it is necessary to provide a circuit rapid disconnecting device with higher insulation strength and expected current segmentation capability to address the problem that the expected current segmentation of some current circuit disconnecting devices is relatively low.

[0006] The present application provides a circuit quick-cutting device, comprising a shell, wherein an igniter, a piston and at least one protrusion are arranged in the shell, a conductor passes through the shell, the igniter and the piston are located on the same side of the conductor, the protrusion is located on the other side of the conductor, the piston has two cutting parts on the side close to the conductor, each of the cutting parts has a cutting edge, and the cutting edge is located at one end of the cutting part away from the other cutting part; the igniter can drive the piston to move in a direction away from the igniter, so as to cut off part of the conductor through the cutting edge, and cut the cut part of the conductor into a plurality of fragments through the step part and the protrusion in the piston.

[0007] In one of the embodiments, a protrusion is provided in the housing, which can cut the portion of the conductor cut off by the piston into two segments.

[0008] In one embodiment, a receiving chamber located between the two cutting portions is provided on the side of the piston close to the conductor, and the protrusion can be inserted into the receiving chamber so that the protrusion and the inner wall of the receiving chamber vertically clamp the fragment.

[0009] In one of the embodiments, the accommodating chamber includes an interlocking cavity corresponding to the protruding portion, and the protruding portion can be inserted into the interlocking cavity and fit with the inner wall thereof.

[0010] In one embodiment, the accommodating chamber further includes two fragment accommodating cavities opened on the inner side wall of the interlocking cavity and / or the protruding portion, each fragment corresponds to one fragment accommodating cavity, and the fragment can be interlocked and abutted against the corresponding inner wall of the fragment accommodating cavity.

[0011] In one of the embodiments, the side surface of the protrusion can be interference fit with the inner side wall of the fitting cavity to isolate the two fragment accommodating cavities.

[0012] In one embodiment, the protrusion has an inclined guide surface, and the fragment abuts against the guide surface to deflect the fragment.

[0013] In one embodiment, the protrusion corresponds to the center position of the conductor at the portion cut off by the piston, so as to cut the conductor at the portion cut off by the piston into two segments of equal length.

[0014] In one embodiment, the piston has a columnar portion at one end away from the ignition device, and the conductor width of the portion to be cut off is smaller than that of the conductor of other portions; in an initial state, the conductor of the portion to be cut off is clamped between the two columnar portions.

[0015] In one embodiment, in an initial state, the cut-off portion and the protruding portion are both close to the conductor.

[0016] The circuit quick cutting device increases the distance between two weak positions of the conductor as much as possible by setting the cutting edge at one end of the cutting part away from the other cutting part, thereby increasing the length of the isolated insulating port after the fragment is cut off, and increasing the expected current segmentation capacity and insulation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the cross-sectional structure of the circuit quick-cut device of the present application in the initial state in the front view direction;

[0018] Figure 2 This is a schematic diagram of the cross-sectional structure in the front view direction of the circuit quick disconnection device of the present application after one of the arc extinguishing bodies is hidden in the blocking state;

[0019] Figure 3 for Figure 1 Schematic diagram of the three-dimensional structure of the middle piston;

[0020] Figure 4 for Figure 1 An enlarged structural diagram of the middle piston;

[0021] Figure 5 for Figure 1 A schematic diagram of the three-dimensional structure of the middle and lower shell;

[0022] Figure 6 for Figure 1 Schematic diagram of the enlarged structure of the middle and lower shells.

[0023] Figure numerals: 100, shell; 110, upper shell; 120, conductor fixing piece; 121, through hole; 130, lower shell; 10, igniter; 20, piston; 21, accommodating chamber; 21a, fragment accommodating chamber; 211a, blocking surface; 21b, fitting chamber; 22, columnar portion; 23, cutting portion; 231, cutting edge; 24, piston avoidance groove; 30, arc extinguishing chamber; 31, arc extinguishing body; 32, partition assembly; 321, raised portion; 321a, guide surface; 321b, cutting edge; 322, partition; 322a, partition avoidance groove; 40, conductor; 41, fragment. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0025] In the description of the present invention, it is to 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”, etc., indicating orientations or positional relationships are 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, and do not indicate or imply 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.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0027] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0029] 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 a central 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 a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0030] Please combine Figures 1 to 4 As shown, the present application provides a circuit quick cutting device, including a shell 100, in which an igniter 10, a piston 20 and a conductor 40 are arranged, the conductor 40 runs through the shell 100, the igniter 10 and the piston 20 are located on the same side of the conductor 40, the piston 20 has two cutting parts 23 on the side close to the conductor 40, each cutting part 23 has a cutting edge 231, and the cutting edge 231 is located at one end of the cutting part 23 away from the other cutting part 23; the igniter 10 can drive the piston 20 to move in a direction away from the igniter 10, so as to cut off part of the conductor 40 through the cutting edge 231 to form a fragment 41.

[0031] The blocking state in this article refers to the state where the ignition tool 10 drives the piston 20 to move to the extreme position of the circuit quick disconnection device, at which time part of the conductor 40 is cut off by the piston 20 to disconnect the circuit.

[0032] Specifically, the conductor 40 has a pre-designed weak position, and the ignition device 10 drives the piston 20 to move toward the arc extinguishing body 31, so that the piston 20 impacts the weak position to cut off part of the conductor 40, forming an isolated insulating break with a certain distance, so as to achieve the effect of cutting off the circuit.

[0033] In the present application, the cutting edge 231 is set at one end of the cutting portion 23 away from the other cutting portion 23 to increase the distance between the two weak positions of the conductor 40 as much as possible, thereby increasing the length of the isolated insulating port after the fragment 41 is cut off, thereby increasing the expected current segmentation capability and insulation effect.

[0034] In some embodiments, at least one protrusion 321 is further provided in the shell 100. The protrusion 321 is located on the other side of the conductor 40 and can cooperate with the step portion in the piston 20 to cut the part of the conductor 40 cut off by the piston 20 into multiple fragments 41 when the piston 20 moves away from the ignition device 10.

[0035] Specifically, the protrusion 321 has at least one cutting edge 321b, so that when the piston 20 moves toward the arc extinguishing body 31, the portion of the conductor 40 cut off by the piston 20 is cut into multiple fragments 41. By cutting 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 arc carrying capacity can be reduced, the possibility of arc leakage can be further reduced, and the insulation effect can be increased.

[0036] Please combine Figure 1 as well as Figure 2 As shown, in some embodiments, a protrusion 321 is provided in the housing 100 , which can cut the portion of the conductor 40 cut off by the piston 20 into two segments 41 .

[0037] 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 .

[0038] It should be noted that in order to improve the arc extinguishing ability, some circuit cutting devices often adopt the method of adding arc extinguishing medium (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 demand for circuit cutting devices in fields such as new energy vehicles.

[0039] In this regard, please combine Figure 2 , Figure 3 as well as Figure 4As shown, in some embodiments, a receiving chamber 21 located between two cutting portions 23 is further provided on the side of the piston 20 close to the conductor 40, and the protrusion 321 can be inserted into the receiving chamber 21 so that the protrusion 321 and the inner side wall of the receiving chamber 21 vertically clamp the fragment 41.

[0040] The vertical clamping here refers to clamping the fragment 41 when the cut end of the fragment 41 is facing toward or away from the igniter 10, and at this time, the protrusion 321 and the inner side wall of the accommodation chamber 21 respectively abut against a pair of end faces of the fragment 41 facing toward or away from the igniter 10 when the fragment 41 is not cut off;

[0041] The vertical fragment 41 is clamped and accommodated between the protrusion 321 and the inner wall of the accommodation 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.

[0042] In addition, in the blocking state, the cut-off portion 23 is blocked between the fragment 41 and the broken end of the conductor 40 to weaken and block the arc therebetween, thereby further improving the current breaking capacity and insulation effect of the current rapid cutting device of the present application.

[0043] Please combine Figure 2 , Figure 3 as well as Figure 4 As shown, in some embodiments, the accommodating chamber 21 includes a fitting cavity 21 b corresponding to the protrusion 321 , and the protrusion 321 can be inserted into the fitting cavity 21 b and fit against the inner wall thereof.

[0044] 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. On the one hand, it reduces the possibility of arc leakage through the gap, and on the other hand, it improves the space utilization inside the shell 100 and further reduces the volume of the circuit quick-cutting device.

[0045] Please combine Figure 2 , Figure 3 as well as Figure 4 As shown, in some embodiments, the accommodating chamber 21 also includes two fragment accommodating cavities 21a opened on the inner wall of the interlocking cavity 21b and / or the protrusion 321, each fragment 41 corresponds to a fragment accommodating cavity 21a, and the fragment 41 can be interlocked and abutted against the inner wall of the corresponding fragment accommodating cavity 21a.

[0046] Taking the fragment accommodating chamber 21a opened in the piston 20 as an example, by opening the fragment accommodating chamber 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 the space utilization rate and reduce the size 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.

[0047] In some embodiments, the side of the protrusion 321 can be interference fit with the inner wall of the interlocking cavity 21b to isolate the two fragment accommodating cavities 21a; through the interference fit between the protrusion 321 and the inner wall of the interlocking cavity 21b, it is possible to prevent the arcs carried by the fragments 41 in different fragment accommodating cavities 21a 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.

[0048] Please combine Figure 2 , Figure 5 as well as Figure 6 As shown, in some embodiments, the protrusion 321 has an inclined guide surface 321 a , and the fragment 41 is abutted against the guide surface 321 a to deflect the fragment 41 .

[0049] 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 flips under the guiding action of the guide surface 321a to fit the guide surface 321a (that is, the fragment 41 is in a vertical state), thereby ensuring that the fracture end of the fragment 41 can be in a vertical state.

[0050] Of course, the orientation of the fragment 41 may also be changed by providing other limiting members or guiding members, as long as the fragment 41 can be ensured to be substantially vertical in the blocking state, and the present application does not make any further limitation thereto.

[0051] Please refer to Figure 1 As shown, in some embodiments, the protrusion 321 corresponds to the center position of the portion of the conductor 40 cut off by the piston 20, so as to cut the portion of the conductor 40 cut off by the piston 20 into two segments 41 of equal length.

[0052] The two segments 41 after cutting are of equal length, which can avoid the situation where the required accommodation space increases due to the length difference of one of the segments 41 , thereby reducing the volume of the device.

[0053] Please refer to Figure 1As shown, in some embodiments, in the initial state, the cutting portion 23 and the protrusion 321 are both close to 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 port 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 between the fracture of the fragment 41 and the conductor 40 to weaken and block the arc and enhance the insulation performance.

[0054] Please combine Figure 1 as well as Figure 2 As shown, in some embodiments, an arc extinguishing chamber 30 is further provided in the housing 100 on the other side of the conductor 40 , an arc extinguishing body 31 is provided in the arc extinguishing chamber 30 , and the broken end of the fragment 41 in the blocking state is inserted into the arc extinguishing body 31 .

[0055] 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.

[0056] 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.

[0057] In the present application, the broken end of the fragment 41 in the blocking state is inserted into the arc extinguishing body 31. Compared with the ordinary circuit cutting device, the fragment 41 directly falls into the arc extinguishing body 31, and under the action of its own weight and the pushing action of the piston 20, the larger side of the fragment 41 is against the arc extinguishing body 31. In the present application, the smaller broken end of the fragment 41 is inserted 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.

[0058] 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.

[0059] In some embodiments, the arc extinguishing body 31 is a metal wire or other material capable of extinguishing an arc, which is not further limited in the present application.

[0060] Please refer to Figure 2 As shown, in some embodiments, in the blocking state, the arc extinguishing body 31 and the piston 20 abut against each other to block the accommodating chamber 21; the fragment 41 is blocked in the accommodating chamber 21 by the arc extinguishing body 31 and the piston 20, and the blocking design can further reduce the possibility of arc leakage, thereby improving the insulation of the circuit quick disconnecting device.

[0061] In some embodiments, the guide surface 321 a may also be an inner wall of the arc extinguishing chamber 30 or other chambers, as long as it can be used to abut against and deflect the fragment 41 .

[0062] 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 the fragment 41 is abutted against the guide surface 321a, and the larger the contact area between the fragment 41 and the arc extinguishing body 31 after the fragment 41 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 verifications, it is found that when the angle range is between 0° and 20°, the impact force of the conventional ignition device 10 can meet the requirements of the fragment 41 being inserted into the arc extinguishing body 31.

[0063] Please combine Figure 2 , Figure 3 as well as Figure 4 As shown, 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 the 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 the arc extinguishing body 31. The columnar portion 22 can reduce the force area of ​​the bottom end of the piston 20 to facilitate the insertion of the piston 20 into the arc extinguishing body 31.

[0064] 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 clamped between the two columnar parts 22, so as to achieve the effect of foolproof installation, and ensure 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. Preferably, the height of the columnar part 22 is greater than or equal to 0.5 mm, so as to ensure that it is clamped in place with the fragment 41, so as to achieve the effect of foolproof installation.

[0065] 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 21a 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.

[0066] Please combine Figure 3 as well as Figure 4 As shown, in some embodiments, the accommodating chamber 21 has a blocking surface 211a, and a step portion is formed between the blocking surface 211a and the interlocking cavity 21b. When the ignition device 10 drives the piston 20 to move away from the ignition device 10, the step portion squeezes the separated portion of the conductor 40, and cooperates with the protrusion 321 to cut the portion of the conductor 40 into multiple fragments 41.

[0067] In the blocking state, the blocking surface 211a abuts against one of the cross sections of the fragment 41 along the movement direction of the piston 20, so that the fragment 41 is pressed into the arc extinguishing body 31 through the blocking surface 211a during the movement of the piston 20 toward the arc extinguishing body 31. Preferably, the blocking surface 211a is the inner wall of the fragment accommodating cavity 21a on one side close to the igniter 10.

[0068] Please refer to Figure 5 As shown, in some embodiments, a partition assembly 32 is fixedly provided in the arc extinguishing chamber 30, and the partition assembly 32 includes at least one protrusion 321 and at least one partition 322; the partition 322 can divide the arc extinguishing chamber 30 into multiple arc extinguishing chambers 30a, and each arc extinguishing chamber 30a is provided with a mutually independent arc extinguishing body 31; each fragment 41 corresponds to an arc extinguishing chamber 30a and a fragment accommodating chamber 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 chamber 21a, and the fragment accommodating chamber 21a is at least partially located in the corresponding arc extinguishing chamber 30a.

[0069] By setting independent arc-extinguishing bodies 31 in each arc-extinguishing cavity 30a and isolating each fragment 41 in the corresponding arc-extinguishing cavity 30a, the arcs carried by the fragments 41 are prevented from being mutually conducted through the metal arc-extinguishing bodies 31, thereby further reducing the possibility of arc restrike and leakage, thereby achieving the effect of increasing the insulation effect of the device.

[0070] Please refer to Figure 1As shown, 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.

[0071] The through hole 121 and the piston 20 are slidably matched, 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 between the piston 20 and the through hole 121, so as to weaken the arc in the first place.

[0072] Please refer to Figure 5 As shown, in some embodiments, the end surface of the lower shell 130 close to the conductor fixing member 120 is flush with the partition 322 .

[0073] 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 tight contact between the conductor fixing part 120 and the end face of the lower shell 130 can prevent the arc from leaking through the gap between the two, and the tight contact between the conductor fixing part 120 and the partition 322 can ensure that the partition 322 separates the arc extinguishing chamber 30 into multiple arc extinguishing chambers 30a, preventing the arcs carried by the fragments 41 in different arc extinguishing chambers 30a from conducting to each other.

[0074] 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 as to achieve a close fit with the lower shell 130 and the partition 322 at the same time, thereby reducing the design and processing difficulty of the conductor fixing part 120.

[0075] Of course, the partition 322 may also protrude or recess relative to the end surface 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 is tightly fitted with both the end surface of the lower shell 130 and the partition 322 .

[0076] Please combine Figure 1 as well as Figure 5 As shown, in some embodiments, the end surface of the lower shell 130 close to the conductor fixing part 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 of the arc extinguishing body 31.

[0077] The arc extinguishing body 31 is flush with the end surface 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 surface of the lower shell 130 close to the conductor fixing piece 120 to prevent 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.

[0078] Preferably, the partition plate 322 and the piston 20 are each provided with an avoidance groove corresponding to the other, so that the two can be plugged into each other; specifically, the partition plate 322 is provided with a partition avoidance groove 322a, and the piston 20 is provided with a piston avoidance groove 24.

[0079] The avoidance groove is only provided on one of the partition plate 322 or the piston 20, and the assembly precision requirement is relatively high: for example, if only the partition plate 322 is provided with the partition plate avoidance groove 322a, as the piston 20 moves toward the arc extinguishing body 31, if the piston 20 shakes or deviates along its own radial direction, the piston 20 will interfere with the partition plate 322 and cannot be inserted into the partition plate avoidance groove 322a. Although increasing the width of the partition plate avoidance groove 322a along the radial direction of the piston 20 can reduce the requirements for processing and assembly precision, it will cause a gap between the piston 20 and the partition plate avoidance groove 322a in the blocking state, which is not conducive to improving the insulation performance;

[0080] 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.

[0081] In the above embodiment, avoidance grooves corresponding to one another are provided on the partition plate 322 and the piston 20, so that when the piston 20 moves toward the arc extinguishing body 31, the two avoidance grooves 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 reserved activity along its radial and circumferential directions. As long as the displacement or deflection of the piston 20 does not exceed the reserved amount, the plugging can be completed normally, which effectively reduces the requirements for the processing and assembly accuracy of the device.

[0082] 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 plug-in. If the depths of the two avoidance grooves are different, then when the movement stroke of the piston 20 exceeds the avoidance groove with a smaller depth after the initial plug-in, the actual plug-in effect at this time is the same as that of the single avoidance groove solution, and only the avoidance groove with a larger depth can provide a unidirectional activity reserve for the piston 20.

[0083] 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 two avoidance grooves 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.

[0084] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0085] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A circuit quick disconnect device, characterized in that: The invention comprises a shell (100), wherein an igniter (10), a piston (20) and at least one protrusion (321) are arranged in the shell (100), a conductor (40) passes through the shell (100), the igniter (10) and the piston (20) are located on the same side of the conductor (40), the protrusion (321) is located on the other side of the conductor (40), and the piston (20) has two cutting portions (23) on the side close to the conductor (40), each of the cutting portions (23) has a cutting edge (231), and the cutting edge (231) is located at one end of the cutting portion (23) away from the other cutting portion (23); The igniter (10) is capable of driving the piston (20) to move in a direction away from the igniter (10) so as to cut off a portion of the conductor (40) through the cutting edge (231), and to cut the cut portion of the conductor (40) into a plurality of fragments (41) through the step portion in the piston (20) and the raised portion (321).

2. The circuit quick disconnect device according to claim 1, characterized in that: The housing (100) is provided with a protruding portion (321) capable of cutting the portion of the conductor (40) cut off by the piston (20) into two fragments (41).

3. The circuit quick disconnect device according to claim 2, characterized in that: The piston (20) is also provided with a receiving chamber (21) located between the two cutting portions (23) on a side close to the conductor (40), and the protrusion (321) can be inserted into the receiving chamber (21), so that the protrusion (321) and the inner side wall of the receiving chamber (21) vertically clamp the fragment (41).

4. The circuit quick disconnect device according to claim 3, characterized in that: The accommodating chamber (21) comprises a fitting cavity (21b) corresponding to the protruding portion (321), and the protruding portion (321) can be inserted into the fitting cavity (21b) and fit against an inner wall thereof.

5. The circuit quick disconnect device according to claim 4, characterized in that: The accommodating chamber (21) further comprises two fragment accommodating chambers (21a) opened on the inner side wall of the interlocking chamber (21b) and / or the protruding portion (321), each fragment (41) corresponds to one fragment accommodating chamber (21a), and the fragment (41) can be interlocked with and abutted against the inner wall of the corresponding fragment accommodating chamber (21a).

6. The circuit quick disconnect device according to claim 5, characterized in that: The side surface of the protruding portion (321) can be interference-fitted with the inner side wall of the interlocking cavity (21b) to isolate the two fragment accommodating cavities (21a).

7. The circuit quick disconnect device according to claim 3, characterized in that: The protrusion (321) has an inclined guide surface (321a), and the fragment (41) is abutted against the guide surface (321a) to deflect the fragment (41).

8. The circuit quick disconnect device according to claim 2, characterized in that: The protrusion (321) corresponds to the center position of the portion of the conductor (40) cut off by the piston (20), so as to cut the portion of the conductor (40) cut off by the piston (20) into two fragments (41) of equal length.

9. The circuit quick disconnect device according to claim 1, characterized in that: The piston (20) has a columnar portion (22) at one end away from the ignition device (10), and the conductor (40) at the portion to be cut off is smaller in width than the conductor (40) at other portions; in an initial state, the conductor (40) at the portion to be cut off is clamped between the two columnar portions (22).

10. The circuit quick disconnect device according to claim 1, characterized in that: In an initial state, the cut-off portion (23) and the protruding portion (321) are both close to the conductor (40).

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