A circuit breaker applied to a direct current distribution network

Abstract

The application discloses a circuit breaker applied to a direct-current power distribution network and belongs to the technical field of the circuit breaker of the direct-current power distribution network, which comprises a direct-current circuit breaker main body, a buffer assembly mechanism is arranged on the bottom surface of the direct-current circuit breaker main body, and the buffer assembly mechanism is used for providing anti-seismic support for the direct-current circuit breaker main body; a supporting mechanism is inserted into the bottom surface of the buffer assembly mechanism, and the supporting mechanism is used for providing a stable base for the buffer assembly mechanism; a protection mechanism is arranged on the top surface of the buffer assembly mechanism and directly above the direct-current circuit breaker main body, and the protection mechanism is used for protecting the direct-current circuit breaker main body on the buffer assembly mechanism; and the buffer assembly mechanism comprises a positioning plate, and a plug-in plate is arranged below the positioning plate. The circuit breaker can reduce damage of vibration to the direct-current circuit breaker main body during automobile driving and protect the direct-current circuit breaker main body from use safety.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of direct current distribution network circuit breaker, in particular to a circuit breaker applied to direct current distribution network. BACKGROUND

[0002] The direct current distribution network is relative to the alternating current distribution network, and a direct current bus is provided for the load, and the direct current load can be directly powered by the direct current bus, and the alternating current load needs to be powered after passing through the inversion device, if the proportion of the direct current load in the load is large, the direct current distribution has great advantages. The direct current distribution network has small line loss, high reliability, no phase frequency control, strong capacity of accepting distributed power supply. Compared with the existing distribution network structure, the direct current distribution network has the following advantages: (1) the line loss of the direct current distribution network is small; (2) the power supply reliability of the direct current distribution network is high; (3) no phase, frequency control, and reactive power and alternating current charging current problems; (4) the direct current distribution network is convenient for distributed power supply, energy storage device and the like to access; (5) environmental protection advantage. The "space charge effect" of the direct current line makes the corona loss and radio interference smaller than the alternating current line, and the electromagnetic radiation is also small, which has environmental protection advantage.

[0003] With the popularity of electric vehicles, electric vehicles are becoming more and more common, and the number of electric vehicles on the road is also increasing. When a large number of electric vehicles are randomly accessed, not only the demand for electric vehicle charging piles is large, but also a large load impact on the alternating current distribution network will be formed, causing a substantial increase in the load of the distribution network. The direct current distribution network can meet the demand of different sizes of electric vehicles for household distribution line capacity, has flexible design, wide application range and strong versatility.

[0004] The circuit breaker refers to a switching device capable of closing, carrying and opening the current under normal loop conditions, and closing, carrying and opening the current under abnormal loop conditions within a specified time. The circuit breaker is divided into high-voltage circuit breaker and low-voltage circuit breaker according to its use range. However, the direct current circuit breaker in the low-voltage circuit breaker is often used as the total power switch of the circuit breaker for the direct current distribution network of the electric vehicle and the automation control using direct current power supply, and is an essential key device in the circuit breaker for the direct current distribution network of the electric vehicle and the automation control.

[0005] The existing circuit breaker is prone to damage during the driving process of the vehicle due to the bumping, thereby reducing the service life of the direct current circuit breaker, and the existing direct current circuit breaker has poor protection effect, further reducing the use safety of the direct current circuit breaker. SUMMARY

[0006] The present application relates to the technical field of direct current distribution network circuit breaker, in particular to a circuit breaker applied to direct current distribution network. The present application relates to the technical field of direct current distribution network circuit breaker, in particular to a circuit breaker applied to direct current distribution network.

[0007] To solve the above technical problems, the present application is realized by the following technical solutions:

[0008] A circuit breaker applied to a direct current distribution network, characterized in that it comprises:

[0009] A direct current circuit breaker body;

[0010] A buffering assembly, comprising a positioning plate, a plug plate and a damping piece, wherein the direct current circuit breaker body is installed on the positioning plate, and the damping piece is installed between the positioning plate and the plug plate;

[0011] A supporting structure, comprising a supporting plate and a limiting strip, wherein the supporting plate is provided with a groove and a sliding groove, the two opposite side walls of the groove are respectively provided with the sliding groove, the plug plate is in sliding cooperation with the sliding groove, the limiting strip is detachably connected with the supporting plate, and the limiting strip is used for limiting the plug plate in the groove; and

[0012] A protection structure, which is in clamping cooperation with the positioning plate, and forms a protection cavity between the protection structure and the positioning plate, and the direct current circuit breaker body is located in the protection cavity.

[0013] Preferably, it further comprises a protection pre-lock structure, which comprises:

[0014] A sliding strip, a first end of the sliding strip being in sliding connection with the positioning plate, a second end of the sliding strip extending into the plug plate, the sliding strip being provided with a clamping groove, the clamping groove being located on the side wall of the sliding strip, the sliding strip being located below the protection structure, and the sliding strip being in clamping connection with the positioning plate;

[0015] A first elastic piece, two ends of the first elastic piece being respectively connected with the sliding strip and the plug plate, and the first elastic piece driving the sliding strip to move towards the positioning plate;

[0016] A pre-lock piece, the pre-lock piece being in rotary connection with the plug plate, a rotary axis of the pre-lock piece being parallel to the sliding direction of the sliding strip, the clamping groove being aligned with the pre-lock piece when the protection structure is installed on the positioning plate;

[0017] A second elastic piece, two ends of the second elastic piece being respectively connected with the plug plate and the pre-lock piece, and the second elastic piece driving the pre-lock piece to rotate towards the sliding strip, the pre-lock piece being clamped into the clamping groove when the sliding strip moves to the position where the clamping groove is aligned with the pre-lock piece; and

[0018] An unlocking strip, the unlocking strip being installed on the supporting plate and being in sliding cooperation with the plug plate, the unlocking strip pushing the pre-lock piece to exit the clamping groove.

[0019] Preferably, the first end of the sliding bar is provided with a positioning block protruding from the surface of the sliding bar in the circumferential direction of the sliding bar, the positioning block is provided with a mounting hole and a positioning slot, the mounting hole penetrates the positioning block in the thickness direction of the positioning block, the positioning slot is located on the side of the positioning block away from the plug-in plate, and the positioning slot is larger than the mounting hole, the sliding bar is in sliding fit with the mounting hole, the positioning slot is in plug-in fit with the positioning block, and the protective structure pushes the positioning block into the positioning slot when the protective structure is installed.

[0020] Preferably, the sliding bar is provided with a limiting block between the positioning plate and the plug-in plate.

[0021] Preferably, the plug-in plate is provided with a first limiting slot and a second limiting slot, the first limiting slot is recessed in the thickness direction of the plug-in plate, the first elastic member is located in the first limiting slot, and the second end of the sliding bar is located in the first limiting slot, the second limiting slot is arranged in the length direction of the plug-in plate, and the unlocking bar is in sliding fit with the second limiting slot.

[0022] Preferably, the pre-locking member is in a bent shape, the pre-locking member includes a first segment and a second segment, the first segment and the second segment are arranged obliquely, and the rotation shaft of the pre-locking member is arranged at the connection between the first segment and the second segment, the first segment is used for clamping fit with the clamping groove, and the second segment is located above the second limiting slot.

[0023] Preferably, the buffer assembly further includes a clamping member, the clamping member includes a C-shaped frame arranged on one side of the top surface of the positioning plate, the C-shaped frame is provided with a slot at both ends, first threaded holes are arranged on the outer side walls of both ends of the C-shaped frame, first locking screws are rotatably connected in the inner cavities of the first threaded holes, the first threaded holes are used for cooperating with the first locking screws to limit the protective structure plugged in the slot, and fixing pieces are fixedly arranged on the side walls of the C-shaped frame, and the bottom surfaces of the fixing pieces are connected with the top surface of the positioning plate.

[0024] Preferably, the protective structure includes a protective cover, a ventilation hole is arranged in the middle of the top surface of the protective cover, a grille plate is arranged in the inner cavity of the ventilation hole, a positioning frame is arranged in the middle of the top surface of the inner cavity of the protective cover and below the ventilation hole, and a fan is arranged in the inner cavity of the positioning frame.

[0025] Preferably, a through hole is arranged on the limiting bar, a second locking screw is plugged into the inner cavity of the through hole, a second threaded hole is arranged in the middle of one side of the inner cavity of the groove, and the second locking screw is in threaded connection with the second threaded hole.

[0026] Preferably, the bottom surface of the limiting strip is provided with tenons on both sides, the second threaded hole is provided with a tenon groove on both sides for inserting the tenon, and the tenon is inserted and matched with the tenon groove.

[0027] Compared with the prior art, the application has the following advantages:

[0028] (1) The buffer assembly mechanism can be installed and fixed on the support mechanism, and can also play a shock-resistant buffering effect, thereby improving the safety of the DC circuit breaker body in use, reducing damage to the DC circuit breaker body caused by vibration during vehicle driving, and being installed at a specified position through the support mechanism, thereby providing a stable basis for the bottom end of the buffer assembly mechanism, and the DC circuit breaker body installed on the buffer assembly mechanism can be protected through the protection structure, further protecting the safety and service life of the DC circuit breaker body.

[0029] (2) The positioning plate in the buffer assembly mechanism can be installed on the DC circuit breaker body, and then connected to the plugboard through the damping piece, and the plugboard can be conveniently inserted into the support mechanism through the plugboard, thereby playing a role in installing the buffer assembly mechanism, and the two damping pieces can provide elastic support for the positioning plate, thereby reducing damage to the DC circuit breaker body caused by vibration during vehicle driving, and the protection structure can be installed through the clamping assembly, thereby improving the stability of the protection structure.

[0030] (3) The support mechanism includes a supporting plate, which can be inserted and installed on the plugboard of the buffer assembly mechanism through the groove and the sliding groove, and the supporting leg can be fixed at a specified position and provide stable support for the supporting plate, and the limiting strip can be installed on the second locking screw through the through hole, and then the second locking screw is rotated to be installed at the bottom end of the second threaded hole, thereby fixing the limiting strip, so that the limiting strip can block the plugboard and prevent the plugboard from loosening and falling off, and the tenon can cooperate with the tenon groove to realize the stability of the limiting strip installation.

[0031] (4) The protection structure includes a protective cover, which can be inserted into the slot of the C-shaped frame and can protect the DC circuit breaker body placed on the positioning plate, thereby improving the safety and service life of the DC circuit breaker body, the grille plate can be installed through the ventilation hole, and then the fan on the positioning frame is opened to cool the DC circuit breaker body, thereby improving the safety of the DC circuit breaker body in use and preventing damage caused by high temperature of the DC circuit breaker body, and the multiple triangular supports distributed in a linear array can strengthen the structural strength of the protective cover, thereby improving the service life of the protective cover. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those of ordinary skill in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0033] Figure 1 A schematic diagram of the circuit breaker applied to the direct current distribution network disclosed by the embodiments of the present application is shown;

[0034] Figure 2 A schematic diagram of the buffer assembly disclosed by the embodiments of the present application is shown;

[0035] Figure 3 A schematic diagram of the clamping piece disclosed by the embodiments of the present application is shown;

[0036] Figure 4 A schematic diagram of the support structure disclosed by the embodiments of the present application is shown;

[0037] Figure 5 A schematic diagram of the protective structure in a first perspective disclosed by the embodiments of the present application is shown;

[0038] Figure 6 A schematic diagram of the protective structure in a second perspective disclosed by the embodiments of the present application is shown;

[0039] Figure 7 An exploded view of the protection pre-lock structure disclosed by the embodiments of the present application is shown;

[0040] Figure 8 A schematic diagram of the plugboard disclosed by the embodiments of the present application is shown;

[0041] Figure 9 A partial enlarged view of the plugboard disclosed by the embodiments of the present application is shown; Figure 8

[0042] In the drawings:

[0043] 100 - direct current circuit breaker main body;

[0044] 200 - buffer assembly, 210 - positioning plate, 220 - plugboard, 221 - first limiting groove, 222 - second limiting groove, 230 - damping piece, 240 - clamping piece, 241 - C-shaped frame, 242 - insertion slot, 243 - first screw hole, 244 - first locking screw, 245 - fixing plate;

[0045] ​300-support structure, 310-support plate, 311-groove, 312-slotted hole, 313-second threaded hole, 314-tongue groove, 315-support leg, 320-limiting strip, 321-through hole, 322-second locking screw;

[0046] 400-protection structure, 410-protection cover, 420-vent hole, 430-grating plate, 4404-positioning frame, 450-fan, 460-tripod, 470-warning sticker;

[0047] 500-protection pre-lock structure, 510-sliding bar, 511-clamping groove, 512-positioning block, 513-limiting block, 520-first elastic member, 530-pre-lock member, 540-unlocking strip. DETAILED DESCRIPTION

[0048] The embodiments of the present application are described in detail below with reference to the accompanying drawings. The embodiments described below are exemplary and are intended to explain the present application, and are not to be understood as limiting the present application.

[0049] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0050] In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0051] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication or interaction relationship of two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0052] See Figures 1 to 6 This invention discloses a circuit breaker for use in a DC distribution network, comprising a DC circuit breaker body 100, a buffer assembly 200, a support structure 300, and a protective structure 400. The buffer assembly 200 is disposed on the bottom surface of the DC circuit breaker body 100, providing seismic support for the DC circuit breaker body 100. The support structure 300 is inserted into the bottom surface of the buffer assembly 200, providing a stable foundation for the buffer assembly 200. The protective structure 400 is disposed on the top surface of the buffer assembly 200, directly above the DC circuit breaker body 100, protecting the DC circuit breaker body 100 on the buffer assembly 200.

[0053] The circuit breaker disclosed in this embodiment, applied to a DC distribution network, utilizes a buffer assembly 200 to both secure the DC circuit breaker body 100 and connect it to the support structure 300. Simultaneously, it provides shock absorption, thereby improving the safety of the DC circuit breaker body 100 and reducing damage to the DC circuit breaker body 100 caused by vibrations during vehicle operation. The support structure 300 allows for installation in a designated location, providing a stable foundation for the bottom of the buffer assembly 200. The protective structure 400 protects the DC circuit breaker body 100 mounted on the buffer assembly 200, further enhancing its safety and lifespan.

[0054] See Figure 2 and Figure 3 The buffer assembly 200 includes a positioning plate 210, and an insert plate 220 is provided below the positioning plate 210. Both sides of the top surface of the insert plate 220 are connected to the positioning plate 210 through damping members 230. The damping members 230 are used to cooperate with the insert plate 220 to provide shock-absorbing buffer for the positioning plate 210.

[0055] Both sides of the top surface of the positioning plate 210 are provided with locking parts 240, and the two sets of locking parts 240 are locked and connected to the protective structure 400. The locking parts 240 are used to lock and install the protective structure 400.

[0056] The positioning plate 210 in the buffer assembly 200 allows for both installation of the DC circuit breaker body 100 and connection to the plug plate 220 via the damping element 230. The plug plate 220 facilitates easy insertion by the user onto the support structure 300, thus enabling the installation of the buffer assembly 200. Furthermore, the two sets of damping elements 230 provide elastic support for the positioning plate 210, reducing the damage to the DC circuit breaker body 100 caused by vibrations during vehicle operation. The engaging element 240 allows for the engaging installation of the protective structure 400, thereby improving its operational stability.

[0057] Referring to Figure 2 , the damping member 230 includes a blocking strip arranged on one side of the bottom surface of the positioning plate 210 and a supporting strip arranged on the top surface of the plug-in plate 220 and located on the same side of the blocking strip. The supporting strip on the same side is connected to the blocking strip through a damping spring. Through the blocking strip and the supporting strip in the damping member 230, the two ends of the damping spring can be respectively mounted on the positioning plate 210 and the plug-in plate 220, so that the plug-in plate 220 can provide elastic support to the positioning plate 210 through the damping spring, and the positioning plate 210 can have a certain anti-vibration buffering function.

[0058] Referring to Figure 2 , the damping spring is arranged in multiple groups, and the multiple groups of damping springs are arranged in a linear array, which can improve the stability of the elasticity of the positioning plate 210.

[0059] Referring to Figure 2 and Figure 3 , the clamping member 240 includes a C-shaped frame 241 arranged on one side of the top surface of the positioning plate 210. One end of the C-shaped frame 241 is provided with a slot 242, and the other end of the C-shaped frame 241 is not blocked in the middle, so as to facilitate the installation of the protective cover 410. As shown in Figure 1 , one end of the protective cover 410 in front is an open end, and the rear end of the protective cover 410 is provided with a baffle. When the protective cover 410 is lowered, the baffle can extrude the sliding strip 510. The outer side wall of both ends of the C-shaped frame 241 is provided with a first threaded hole, and the first threaded hole is rotatably connected with a first locking screw 244. The first threaded hole is used to cooperate with the first locking screw 244 to limit the protective structure 400 inserted in the slot 242.

[0060] Both side walls of the C-shaped frame 241 are fixedly provided with a fixed sheet 245, and the bottom surface of the fixed sheet 245 is connected with the top surface of the positioning plate 210. The fixed sheet 245 is used to fix the C-shaped frame 241.

[0061] Through the C-shaped frame 241 in the clamping member 240, the supporting structure 300 can be inserted and clamped through the slot 242. Then, by rotating the first locking screw 244 in the first threaded hole, the protective structure 400 in the slot 242 can be limited, and the stability of the use of the protective structure 400 can be improved. Through the fixed sheet 245, the C-shaped frame 241 can be fixed, and the C-shaped frame 241 can be prevented from loosening.

[0062] Referring to Figure 4The supporting structure 300 comprises a supporting plate 310. A groove 311 is formed in the middle of the top surface of the supporting plate 310. Sliding grooves 312 are formed in the side walls of the inner cavity of the groove 311. The groove 311 is used in cooperation with the sliding grooves 312 to achieve the insertion and installation of the bottom end of the buffer assembly 200. Supporting legs 315 are arranged on the bottom surface of the supporting plate 310.

[0063] A limiting strip 320 is arranged at one end of the inner cavity of the groove 311. A through hole 321 is formed in the middle of the top surface of the limiting strip 320. A second locking screw 322 is inserted into the inner cavity of the through hole 321. A second threaded hole is formed in the middle of one side of the inner cavity of the groove 311. The second threaded hole is used in cooperation with the second locking screw 322 to achieve the limiting and fixing of the limiting strip 320.

[0064] Through the supporting plate 310 in the supporting structure 300, the insertion plate 220 on the buffer assembly 200 can be inserted and installed through the groove 311 and the sliding groove 312. Through the supporting legs 315, it can be fixed in the specified position and can provide stable support for the supporting plate 310. Then through the limiting strip 320, the second locking screw 322 can be installed through the through hole 321, and then the second locking screw 322 is rotated, so that the bottom end thereof can be installed on the second threaded hole, and the limiting strip 320 can be fixed, so that the limiting strip 320 can block the insertion plate 220 and prevent the insertion plate 220 from loosening and falling off.

[0065] Referring to Figure 4 The bottom surface of the limiting strip 320 is provided with a tenon on both sides. The second threaded hole is provided with a mortise 314 on both sides for inserting the tenon. The tenon is used in cooperation with the mortise 314 to achieve the stability of the installation of the limiting strip 320.

[0066] Through the tenon, the mortise 314 can be used to achieve the stability of the installation of the limiting strip 320.

[0067] Referring to Figure 5 and Figure 6 The protective structure 400 comprises a protective cover 410. A ventilation hole 420 is formed in the middle of the top surface of the protective cover 410. A grille plate 430 is arranged in the inner cavity of the ventilation hole 420. A positioning frame 4404 is arranged in the middle of the top surface of the inner cavity of the protective cover 410 and below the ventilation hole 420. A fan 450 is arranged in the inner cavity of the positioning frame 4404.

[0068] Through the protective cover 410 in the protective structure 400, it can be inserted into the slot 242 on the C-shaped frame 241, and the DC circuit breaker body 100 placed on the positioning plate 210 can be protected, thereby improving the safety and service life of the DC circuit breaker body 100. Through the ventilation hole 420, the grid plate 430 can be installed, and then by opening the fan 450 on the positioning frame 4404, the DC circuit breaker body 100 can be cooled, thereby improving the safety of the DC circuit breaker body 100 and preventing the DC circuit breaker body 100 from being damaged due to high temperature.

[0069] Referring to Figure 6 , the inner cavity of the protective cover 410 is provided with a plurality of triangular supports 460 on the top of the two side walls, and the plurality of triangular supports 460 are arranged in a linear array, which can strengthen the structural strength of the protective cover 410, thereby improving the service life of the protective cover 410.

[0070] Referring to Figure 5 , the top surface of the protective cover 410 is bonded with warning stickers 470 on both sides, which can play a warning and reminding function to prevent damage by personnel.

[0071] In use: through the buffer assembly 200, the DC circuit breaker body 100 can be installed and fixed, and can be inserted into the support structure 300, and can also play a shock absorbing effect, thereby improving the safety of the DC circuit breaker body 100 and reducing damage to the DC circuit breaker body 100 caused by vibration during vehicle driving. Through the support structure 300, it can be installed in a designated position, thereby providing a stable basis for the bottom end of the buffer assembly 200. Through the protective structure 400, the DC circuit breaker body 100 installed on the buffer assembly 200 can be protected, further protecting the safety and service life of the DC circuit breaker body 100.

[0072] Through the positioning plate 210 in the buffer assembly 200, the DC circuit breaker body 100 can be installed, and the damping member 230 can be connected with the plug-in plate 220, and then through the plug-in plate 220, the user can conveniently insert it into the support structure 300, thereby playing a role in installing the buffer assembly 200. And through the two damping members 230, the plug-in plate 220 can provide elastic support for the positioning plate 210, thereby reducing damage to the DC circuit breaker body 100 caused by vibration during vehicle driving. Through the clamping member 240, the protective structure 400 can be clamped and installed, thereby improving the stability of the protective structure 400.

[0073] Through the blocking strip and the supporting strip in the damping member 230, the two ends of the damping spring can be installed on the positioning plate 210 and the plug-in plate 220 respectively, thereby enabling the plug-in plate 220 to provide elastic support for the positioning plate 210 through the damping spring, and thereby enabling the positioning plate 210 to have a certain shock absorbing function.

[0074] By the C-shaped frame 241 in the clamping piece 240, the support structure 300 can be inserted and clamped and installed through the slot 242, and then the protective structure 400 on the slot 242 can be limited by rotating the first locking screw 244 on the first threaded hole, thereby improving the stability of the use of the protective structure 400. By the fixing sheet 245, the C-shaped frame 241 can be installed and fixed, thereby preventing the C-shaped frame 241 from loosening.

[0075] By the supporting plate 310 in the support structure 300, the plug-in plate 220 on the buffer assembly 200 can be inserted and installed through the groove 311 and the sliding groove 312. By the supporting leg 315, the supporting plate 310 can be fixed in a specified position and stably supported. Then by the limiting strip 320, the second locking screw 322 can be installed through the through hole 321, and then the second locking screw 322 is rotated to be installed at the bottom end of the second threaded hole, thereby fixing the limiting strip 320 to prevent the limiting strip 320 from loosening and falling off. By the tenon, the limiting strip 320 can be installed stably in cooperation with the mortise 314.

[0076] By the protective cover 410 in the protective structure 400, the DC circuit breaker body 100 placed on the positioning plate 210 can be protected by being inserted into the slot 242 on the C-shaped frame 241, thereby improving the safety and service life of the DC circuit breaker body 100. By the ventilation hole 420, the grid plate 430 can be installed. Then by opening the fan 450 on the positioning frame 4404, the DC circuit breaker body 100 can be cooled, thereby improving the safety of the use of the DC circuit breaker body 100 and preventing the DC circuit breaker body 100 from being damaged due to high temperature. By the multiple groups of triangular supports 460 distributed in a linear array, the structural strength of the protective cover 410 can be strengthened, thereby improving the service life of the protective cover 410, and the warning sticker 470 can play a warning and reminding function to prevent personnel from damaging.

[0077] Referring to Figures 7 to 9 The DC power distribution network circuit breaker disclosed in the embodiment further comprises a protective pre-locking structure 500 for locking the positioning plate 210 and the plug-in plate 220 during installation to prevent the positioning plate 210 and the plug-in plate 220 from shaking relative to each other during installation, thereby making the installation more convenient and accurate.

[0078] Specifically, the protection pre-lock structure 500 comprises a sliding bar 510, a first elastic member 520, a pre-lock member 530, a second elastic member, and an unlocking bar 540. The first end of the sliding bar 510 is in sliding connection with the positioning plate 210, and the second end of the sliding bar 510 extends into the plug plate 220. The sliding bar 510 is provided with a clamping groove 511 on the side wall thereof. The sliding bar 510 is located below the protection structure 400, and when the protection structure 400 is installed, the protection structure 400 can push the sliding bar 510 to move towards the plug plate 220, and make the sliding bar 510 form clamping connection with the positioning plate 210. The two ends of the first elastic member 520 are connected with the sliding bar 510 and the plug plate 220 respectively, and the first elastic member 520 makes the sliding bar 510 have a tendency to move towards the positioning plate 210. The pre-lock member 530 is in rotational connection with the plug plate 220, the rotational axis of the pre-lock member 530 is parallel to the sliding direction of the sliding bar 510, and when the protection structure 400 is installed to the positioning plate 210, the sliding bar 510 is pushed to be aligned with the pre-lock member 530 in the clamping groove 511. The two ends of the second elastic member are connected with the plug plate 220 and the pre-lock member 530 respectively, the second elastic member makes the pre-lock member 530 have a tendency to rotate towards the sliding bar 510, and when the sliding bar 510 moves to be aligned with the pre-lock member 530 in the clamping groove 511, the pre-lock member 530 can be clamped into the clamping groove 511. The unlocking bar 540 is installed to the supporting plate 310, and the unlocking bar 540 is in sliding cooperation with the plug plate 220, when the unlocking bar 540 moves towards the sliding bar 510, the unlocking bar 540 can push the pre-lock member 530 to exit the range of the clamping groove 511.

[0079] When installing, first install the protection structure 400 on the positioning plate 210, and then install the protection structure 400. When the protection structure 400 is installed, the bottom of the protection structure 400 extrudes and pushes the sliding bar 510 to move towards the plug plate 220. When the protection structure 400 is installed, the sliding bar 510 is just pushed to be clamped with the positioning inner plate, at this time the sliding bar 510 cannot continue to slide relative to the positioning plate 210, and at this time the clamping groove 511 on the sliding bar 510 is aligned with the pre-locking piece 530, at this time the pre-locking piece 530 is clamped into the clamping groove 511 under the action of the second elastic piece, so that the sliding bar 510 cannot continue to slide relative to the plug plate 220, that is, at this time the sliding bar 510 cannot slide relative to the positioning plate 210, nor can it slide relative to the plug plate 220, so that the positioning plate 210 and the plug plate 220 cannot move relative to each other, making the subsequent installation more convenient. Then connect the plug plate 220 and the support structure 300. When the plug plate 220 is inserted into the groove 311, the unlocking bar 540 on the supporting plate 310 pushes the pre-locking piece 530 to rotate in the opposite direction to overcome the elastic force of the second elastic piece until the pre-locking piece 530 completely leaves the range of the clamping groove 511, that is, when the plug plate 220 and the supporting plate 310 are installed, the pre-locking piece 530 completely leaves the range of the clamping groove 511, at this time the sliding bar 510 can move up and down on the plug plate 220, that is, at this time the positioning plate 210 can move up and down relative to the plug plate 220, and under the action of the damping spring, the shock absorption of the direct current circuit breaker body 100 can be realized.

[0080] When disassembling, first remove the protection structure 400. After the protection structure 400 is removed, the sliding bar 510 moves upward under the elastic force of the first elastic piece 520, and the clamping groove 511 on the sliding bar 510 is misaligned with the pre-locking piece 530, so that the pre-locking piece 530 cannot be directly clamped into the clamping groove 511 after the plug plate 220 leaves the supporting plate 310, thereby ensuring that the buffer assembly 200 can be normally tested or repaired thereafter.

[0081] Referring to Figure 7The first end of the sliding bar 510 is provided with a positioning block 512 and a limiting block 513. The positioning block 512 protrudes from the surface of the sliding bar 510 along the circumference of the sliding bar 510. The positioning plate 210 is provided with a mounting hole and a positioning groove. The mounting hole penetrates the positioning plate 210 along the thickness direction of the positioning plate 210, and the positioning groove is located on the side of the positioning plate 210 away from the insertion plate 220 and is larger than the mounting hole. The sliding bar 510 is in sliding fit with the mounting hole, and the positioning groove is in plug-in fit with the positioning block 512. When the protection structure 400 is mounted, the protection structure 400 can push the positioning block 512 into the positioning groove. The limiting block 513 is located between the positioning plate 210 and the insertion plate 220, and the limiting block 513 is used for limiting the sliding bar 510, so as to avoid that the sliding bar 510 is separated from the range of the positioning plate 210 or the insertion plate 220 under the elastic force of the first elastic member 520.

[0082] Referring to Figure 8 and Figure 9 , in order to facilitate the installation of the first elastic member 520, the pre-locking member 530 and the second elastic member, the insertion plate 220 is provided with a first limiting groove 221 and a second limiting groove 222. The first limiting groove 221 is recessed along the thickness direction of the insertion plate 220, the first elastic member 520 is located in the first limiting groove 221, and the second end of the sliding bar 510 is located in the first limiting groove 221. The second limiting groove 222 is provided along the length direction of the insertion plate 220, and the unlocking bar 540 is in sliding fit with the second limiting groove 222. The cooperation of the second limiting groove 222 and the unlocking bar 540 can realize the positioning and limiting of the insertion plate 220, so that the installation position of the insertion plate 220 is more accurate, and the connection between the insertion plate 220 and the supporting plate 310 is more stable.

[0083] Referring to Figure 7 , the pre-locking member 530 is in a bent shape, and the pre-locking member 530 includes a first section and a second section. The first section and the second section are obliquely arranged, and the rotation shaft of the pre-locking member 530 is arranged at the connection between the first section and the second section. The first section is used for being in clamping fit with the clamping groove 511, and the second section is located above the second limiting groove 222.

[0084] The above only describes specific embodiments of the present application, but the technical features of the present application are not limited to this. Any changes or modifications made by those skilled in the art within the scope of the present application are covered by the patent scope of the present application.

Claims

1. A circuit breaker for use in a direct current distribution network, characterized in that The direct current circuit breaker comprises a main body, a buffering assembly, a supporting structure, and a protection structure. The buffering assembly comprises a positioning plate, a plug plate, and a damping piece. The supporting structure comprises a supporting plate and a limiting strip. The protection structure is connected with the positioning plate. The protection structure and the positioning plate form a protection cavity, and the main body is located in the protection cavity. The protection structure comprises a sliding strip, a first elastic piece, a pre-locking piece, a second elastic piece, and an unlocking strip. The first end of the sliding strip is connected with the positioning plate. The second end of the sliding strip extends into the plug plate. The first elastic piece is connected with the sliding strip and the plug plate. The pre-locking piece is connected with the plug plate. The second elastic piece is connected with the plug plate and the pre-locking piece. The unlocking strip is connected with the supporting plate and the plug plate.

2. The circuit breaker for use in a DC distribution network according to claim 1, characterized in that The protection structure is used for locking the positioning plate and the plug plate during installation.

3. The circuit breaker for use in a DC distribution network according to claim 1, characterized in that The first end of the sliding strip is provided with a positioning block. The positioning plate is provided with a mounting hole and a positioning groove. The mounting hole penetrates the positioning plate along the thickness direction of the positioning plate. The positioning groove is located on the side of the positioning plate away from the plug plate. The positioning groove is larger than the mounting hole. The sliding strip is connected with the mounting hole. The positioning groove is connected with the positioning block. The protection structure pushes the positioning block into the positioning groove during installation. The sliding strip is provided with a limiting block. The limiting block is located between the positioning plate and the plug plate.

4. The circuit breaker for use in a DC distribution network according to claim 1, characterized in that, The plug-in plate is provided with a first limiting groove and a second limiting groove, the first limiting groove is recessed along the thickness direction of the plug-in plate, the first elastic piece is located in the first limiting groove, and the second end of the sliding bar is located in the first limiting groove, the second limiting groove is arranged along the length direction of the plug-in plate, and the unlocking bar is in sliding fit with the second limiting groove.

5. The circuit breaker for use in a DC distribution network according to claim 4, characterized in that The pre-locking piece is in a bent shape, the pre-locking piece comprises a first segment and a second segment, the first segment and the second segment are arranged obliquely, the rotation shaft of the pre-locking piece is arranged at the connection between the first segment and the second segment, the first segment is used for clamping fit with the clamping groove, and the second segment is located above the second limiting groove.

6. A circuit breaker for use in a DC power distribution network according to any one of claims 1 to 5, characterized in that, The buffer assembly further comprises a clamping piece, the clamping piece comprises a C-shaped frame arranged on one side of the top surface of the positioning plate, the C-shaped frame is provided with a slot at both ends, first threaded holes are arranged on the outer side walls of both ends of the C-shaped frame, first locking screws are rotatably connected in the first threaded hole inner cavities, and the first threaded holes are used for cooperating with the first locking screws to limit the protection structure inserted in the slot. Both side walls of the C-shaped frame are fixedly provided with fixing pieces, and the bottom surfaces of the fixing pieces are connected with the top surface of the positioning plate, and the fixing pieces are used for mounting and fixing the C-shaped frame.

7. A circuit breaker for use in a DC power distribution network according to any one of claims 1 to 5, characterized in that, The protection structure comprises a protective cover, a ventilation hole is arranged in the middle of the top surface of the protective cover, a grille plate is arranged in the ventilation hole inner cavity, a positioning frame is arranged in the middle of the top surface of the inner cavity of the protective cover and below the ventilation hole, and a fan is arranged in the inner cavity of the positioning frame.

8. The circuit breaker for use in a DC power distribution network according to any one of claims 1 to 5, characterized in that A through hole is arranged on the limiting strip, a second locking screw is inserted in the through hole inner cavity, a second threaded hole is arranged in the middle of one side of the groove inner cavity, and the second locking screw is in threaded connection with the second threaded hole.

9. The circuit breaker for use in a DC distribution network according to claim 8, characterized in that Both sides of the bottom surface of the limiting strip are provided with tenons, tenon grooves for inserting the tenons are arranged on both sides of the second threaded hole, and the tenons are in insertion fit with the tenon grooves.

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