Circuit connection structure of circuit breaker

Abstract

A circuit breaker and a circuit connection structure of the circuit breaker, the circuit connection structure of the circuit breaker comprises a plug-in circuit board, a current transformer is arranged in a shell of the circuit breaker, a second contact mechanism connected with the current transformer is arranged in the shell, and a through cavity is arranged in the shell corresponding to one side of the second contact mechanism along a thickness direction; when a plurality of circuit breakers are arranged side by side along the thickness direction, the cavities on the plurality of circuit breakers are sequentially connected in a head-to-tail mode to form a plug slot, the plug-in circuit board can be inserted into the plug slot along the thickness direction of the circuit breaker to be connected with the plurality of circuit breakers, and the circuit breaker does not need to be welded with a wire between a control unit and the circuit breaker, so that the circuit breaker has the characteristics of convenient assembly and repair.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of low-voltage electrical apparatus, in particular to a circuit breaker and a circuit connection structure of the circuit breaker. BACKGROUND

[0002] The circuit breaker is used for controlling and protecting an electric circuit, and usually a plurality of circuit breakers are connected to different lines respectively and then connected to a control unit through wires. However, with the development of the circuit breaker towards intelligence, the circuit breaker has more and more functions, and more wires are needed for electric signal transmission and power supply. Since the internal structure of the circuit breaker is compact, the wires need to pass through a plurality of circuit breakers and then be welded to the control unit, which not only has great production difficulty and is difficult to repair, but also causes the wires to be easily broken and has a safety hazard. SUMMARY

[0003] The present application aims to overcome the defects of the prior art and provide a circuit breaker with convenient signal transmission and reliable power supply.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0005] A circuit breaker, a current transformer is arranged in a shell, and a second contact mechanism connected with the current transformer, and a through cavity is arranged on one side of the second contact mechanism along the thickness direction of the shell.

[0006] Preferably, a power supply terminal is arranged at one end of the circuit breaker, and the cavity on the shell corresponds to the second contact mechanism and the power supply terminal.

[0007] Preferably, a load terminal is arranged at one end of the circuit breaker, and a second through cavity is arranged on one side of the load terminal along the thickness direction of the shell.

[0008] Preferably, a power supply terminal and a load terminal are arranged at two ends of the shell respectively, and a rail cavity is arranged below the power supply terminal and the load terminal at the two ends of the shell respectively, the two rail cavities are arranged at intervals to form a rail recess for limiting the rail, and the cavity is arranged between the power supply terminal and the rail cavity below the power supply terminal, or in the rail cavity below the power supply terminal.

[0009] Preferably, the power terminal comprises a U-shaped terminal plate limited in the shell, the terminal plate comprises an upper terminal part and a lower terminal part arranged oppositely, and a middle terminal part connected between the upper terminal part and one end of the lower terminal part, the upper terminal part is matched with the terminal frame and the terminal screw, the length direction of the upper terminal part is parallel to the axis of the current transformer, and the upper terminal part is arranged along the length direction of the circuit breaker on one side of the current transformer, the length direction of the lower terminal part is parallel to the second contact mechanism, and the lower terminal part is arranged along the length direction of the circuit breaker on one side of the second contact mechanism, and the lower terminal part and the second contact mechanism are both located on one side of the cavity.

[0010] Preferably, the second contact mechanism is a connection line plate, and the second contact mechanism is provided with two second welding holes connected with two ends of the transformer lead of the current transformer respectively, and two second solder pads of a flat plate structure corresponding to the second welding holes respectively.

[0011] Preferably, the second contact mechanism comprises two first elastic sheets limited in the shell, the first elastic sheet comprises a flat part and a curved part bent from one end of the flat part to the side, the other end of the flat part is provided with a first welding hole, and the middle part of the flat part is provided with a fixing hole, and two ends of the transformer lead of the current transformer are connected with the first welding hole respectively; the shell comprises an upper shell and a lower shell arranged oppositely along the thickness direction, the lower shell is provided with a first fixing boss corresponding to the middle part of the flat part, the first fixing boss is provided with a groove and is provided with a fixing shaft in the groove, the upper shell is provided with a pressing plate arranged oppositely with the fixing shaft, the fixing hole on the flat part is pressed in the groove by the pressing plate after passing through the fixing shaft, so that the two side edges of the middle part of the flat part are limited by the groove respectively, one end of the flat part provided with the first welding hole is suspended above the first fixing boss on the side close to the current transformer for connecting the induction of the current transformer, and one end of the flat part provided with the curved part is suspended above the first fixing boss on the side away from the current transformer, and the side of the first fixing boss away from the current transformer constitutes a side wall of the cavity.

[0012] Preferably, the shell is provided with a rail cavity for limiting the rail below the power terminal, the rail cavity is provided with a second upper fixing boss integrally formed with the upper shell and a second lower fixing boss integrally formed with the lower shell, the second upper fixing boss and the second lower fixing boss are arranged at intervals after the assembly of the upper shell and the lower shell, the second lower fixing boss is arranged at intervals on the side of the first fixing boss away from the current transformer and constitutes one end of the cavity, and the upper shell is provided with a first upper fixing boss arranged oppositely with the first fixing boss on the side of the second upper fixing boss close to the current transformer, the first upper fixing boss and the second upper fixing boss are arranged at intervals and constitute the other end of the cavity.

[0013] The circuit connection structure of the circuit breaker has the characteristics of good process and convenient assembly.

[0014] The circuit connection structure of the circuit breaker has the characteristics of good process and convenient assembly.

[0015] The circuit connection structure of the circuit breaker has the characteristics of good process and convenient assembly.

[0016] Preferably, one end of the circuit breaker is provided with a power connection terminal, one side of the plug-in circuit board corresponding to the first contact mechanism is provided with a third contact mechanism corresponding to the power connection terminal, and when the plug-in circuit board is inserted into the slot to connect the first contact mechanism with the corresponding second contact mechanism, the third contact mechanism is connected with the corresponding power connection terminal.

[0017] Preferably, a second plug-in circuit board connected with the control unit is further included, one end of the circuit breaker is provided with a load connection terminal, the second plug-in circuit board is provided with a fourth contact mechanism corresponding to the load connection terminal in the circuit breaker, a second cavity is formed in the thickness direction on one side of the load connection terminal corresponding to the plurality of housings, and when the plurality of circuit breakers are arranged side by side in the thickness direction, the plurality of second cavities are sequentially connected to form a second slot, the second plug-in circuit board can be inserted into the second slot in the thickness direction of the circuit breaker, the plurality of fourth contact mechanisms on the second plug-in circuit board are located in the second cavities of the corresponding circuit breakers, and the fourth contact mechanisms are connected with the corresponding load connection terminals.

[0018] Preferably, the plug-in circuit board and / or the second plug-in circuit board are vertically arranged with a control circuit board in the control unit, one end of the plug-in circuit board and the second plug-in circuit board is connected with the control circuit board through a plug pin of an L-shaped structure, one end of the plug pin is perpendicular to the corresponding plug-in circuit board and the second plug-in circuit board, and the other end of the plug pin is parallel to the insertion direction of the corresponding plug-in circuit board and the second plug-in circuit board.

[0019] Preferably, the first contact mechanism comprises two second elastic sheets, or the first contact mechanism is two flat-plate structured first pads; the third contact mechanism comprises a third elastic sheet.

[0020] Preferably, the second elastic sheet and the third elastic sheet are of the same structure, and the second elastic sheet and the third elastic sheet each comprise an elastic part in a V-shaped structure, the elastic part is invertedly buckled on the plug-in circuit board, the middle part of the elastic part is protruded away from the plug-in circuit board, the middle part of the elastic part is provided with a avoiding slot, one end of the elastic part is bent to form an insertion part close to the plug-in circuit board, the other end of the elastic part is bent to form a sliding part away from the plug-in circuit board, the connection part of the sliding part and the elastic part is in sliding fit with the plug-in circuit board, the middle part of the insertion part is provided with a U-shaped structure avoiding slot, the insertion part is formed with insertion feet passing through the plug-in circuit board on both sides of the avoiding slot, and the insertion feet are welded and fixed with the plug-in circuit board.

[0021] Preferably, the second plug-in circuit board is provided with a fourth elastic sheet for connecting a load terminal, and the fourth elastic sheet on the second plug-in circuit board is connected with one side of the load terminal close to the electromagnetic tripping mechanism.

[0022] The circuit connection structure of the circuit breaker of the application, the induced currents generated by the plurality of current transformers are transmitted to the control unit through the plug-in circuit board as electric signals, so that the circuit breaker product has the functions of current measurement and overcurrent protection, and the plug-in circuit board is integrally inserted into the slot along the thickness direction of the circuit breaker, i.e. the direction of parallel arrangement, so that the first contact mechanism is located in the corresponding cavity and contacts with the corresponding second contact mechanism, without the need of welding wires between the control unit and the circuit breaker, and the circuit breaker has the characteristics of convenient assembly and repair.

[0023] In addition, the plug-in circuit board can be used not only for transmitting electric signals of the current transformer, but also for taking power from the circuit breaker by the control unit, and the plug-in circuit board is provided with third contact mechanisms for taking power on one side of the first contact mechanism. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a structural schematic diagram of the circuit breaker of the embodiment of the application;

[0025] Figure 2 is a cooperation schematic diagram of the circuit breaker and the control circuit board of the embodiment of the application;

[0026] Figure 3 is a cooperation schematic diagram of the circuit breaker and the second plug-in circuit board of the embodiment of the application;

[0027] Figure 4 is a cooperation schematic diagram of the circuit breaker and the plug-in circuit board of the embodiment of the application;

[0028] Figure 5is a structure schematic diagram of the plug-in circuit board in the embodiment one of the present invention;

[0029] Figure 6 is a cooperation schematic diagram of the plug-in circuit board and the circuit breaker in the embodiment one of the present invention;

[0030] Figure 7 is a structure schematic diagram of the second contact mechanism in the embodiment one of the present invention;

[0031] Figure 8 is a cooperation schematic diagram of the second contact mechanism and the shell of the circuit breaker in the embodiment one of the present invention;

[0032] Figure 9 is a structure schematic diagram of the plug-in circuit board in the embodiment two of the present invention;

[0033] Figure 10 is a cooperation schematic diagram of the plug-in circuit board and the shell of the circuit breaker in the embodiment two of the present invention;

[0034] Figure 11 is a structure schematic diagram of the second contact mechanism in the embodiment two of the present invention;

[0035] Figure 12 is a structure schematic diagram of the second elastic sheet in the embodiment two of the present invention;

[0036] Figure 13 is a partial enlarged view of the embodiment Figure 4 of the present invention;

[0037] Figure 14 is a cooperation schematic diagram of the second plug-in circuit board and the load terminal in the embodiment of the present invention. DETAILED DESCRIPTION

[0038] As shown in Figure 7 , 11 , the present invention provides a connection structure of a current transformer, the connection structure of the current transformer of the present invention comprises a current transformer 210, the transformer wire 212 of the current transformer 210 is electrically connected with a second contact mechanism, the second contact mechanism comprises a plate-shaped fixed part and an electric contact part for sliding contact cooperation electric connection.

[0039] The connection structure of the current transformer of the present invention, the transformer wire 212 of the current transformer 210 is electrically connected with the second contact mechanism, the second contact mechanism comprises a plate-shaped fixed part for installing and fixing to guarantee the reliability of electric connection, and occupies very small space, the second contact mechanism is provided with the electric contact part for sliding contact cooperation to facilitate electric connection and save space.

[0040] As shown in Figure 7As shown, the current transformer 210 includes a transformer shell, and a transformer wire 212 arranged in the transformer shell. The plate-shaped fixing portion of the second contact mechanism is provided with a welding hole for connecting with the transformer wire 212. The transformer wire 212 is welded with the second contact mechanism after passing through the corresponding welding hole. The plate-shaped fixing portion not only plays a role of mounting and fixing the second contact mechanism, but is also provided with a welding hole for welding with the transformer wire 212. The transformer wire 212 is welded with the second contact mechanism after passing through the corresponding welding hole, and the welding is more reliable and not easy to be de-welded. The current transformer can be a through-type current transformer, a Rogowski coil, a tunnel magnetoresistive current sensor, etc.

[0041] Preferably, as shown in the embodiment, the second contact mechanism is a first elastic sheet 221. The first elastic sheet 221 is in a plate-shaped structure, one end of which is a plate-shaped fixing portion. The other end of the first elastic sheet 221 is bent to the side to form a bent portion 221b as an electrical contact portion. Figure 7 As shown in the embodiment, the second contact mechanism is a first elastic sheet 221. The first elastic sheet 221 is in a plate-shaped structure, one end of which is a plate-shaped fixing portion. The other end of the first elastic sheet 221 is bent to the side to form a bent portion 221b as an electrical contact portion.

[0042] In particular, in the preferred embodiment of the present application, the second contact mechanism is a connecting circuit board 220. The connecting circuit board 220 constitutes a plate-shaped fixing portion. The connecting circuit board 220 is provided with a second solder pad 225 for sliding contact cooperation as an electrical contact portion. The connecting circuit board 220 is provided with a welding hole for connecting with the transformer wire 212, and the second solder pad 225 electrically connected with the welding hole. The second solder pad 225 is used for connecting with the control circuit board 110 through the plug-in circuit board 300. The plug-in circuit board 300 is provided with a second elastic sheet 312 matched with the second solder pad 225. The small plate-shaped connecting circuit board 220 not only saves space, but also is easy to fix. The sliding cooperation of the solder pad realizes reliable electrical connection.

[0043] As shown in the embodiment, the second contact mechanism is a first elastic sheet 221. The first elastic sheet 221 is in a plate-shaped structure, one end of which is a plate-shaped fixing portion. The other end of the first elastic sheet 221 is bent to the side to form a bent portion 221b as an electrical contact portion. Figures 1-6As shown, the application also provides a circuit connection structure of a circuit breaker, which comprises a control unit 100 and a plurality of circuit breakers 200, and a plug-in circuit board 300 connected with the control unit 100, wherein the plug-in circuit board 300 is provided with a first contact mechanism 310 corresponding to each of the plurality of circuit breakers 200, each of the plurality of circuit breakers 200 is provided with a current transformer 210 for passing through the main circuit current of each circuit breaker, the shell 230 of each of the plurality of circuit breakers 200 is provided with a cavity 240 along the thickness direction on the side corresponding to the second contact mechanism, and each of the plurality of cavities 240 is provided with an opening corresponding to the second contact mechanism, when the plurality of circuit breakers 200 are arranged side by side along the thickness direction, the cavities 240 of the plurality of circuit breakers 200 are sequentially connected in series to form a slot, and the plug-in circuit board 300 can be inserted into the slot along the thickness direction of the circuit breaker 200, so that the plurality of first contact mechanisms 310 on the plug-in circuit board 300 are respectively located in the cavities 240 of the corresponding circuit breakers 200, and the first contact mechanisms 310 are connected with the corresponding second contact mechanisms.

[0044] The circuit breaker of the application is provided with the cavities 240 penetrating through the shell 230 on the side corresponding to the second contact mechanism along the thickness direction, which not only avoids the structure for connecting the circuit breaker 200 with the control unit 100, but also facilitates the reliable connection of the plurality of circuit breakers 200 with the control unit 100, and has the characteristics of good process and easy assembly.

[0045] The circuit connection structure of the circuit breaker of the application, the induced current generated by the plurality of current transformers 210 is transmitted to the control unit 100 through the plug-in circuit board 300, which not only makes the circuit breaker product have the functions of current measurement and overcurrent protection, but also makes the plug-in circuit board 300 be inserted into the slot along the thickness direction of the circuit breaker 200, i.e. the direction of side-by-side arrangement, so that the first contact mechanisms 310 are respectively located in the corresponding cavities 240 and contact with the corresponding second contact mechanisms, without the need of welding wires between the control unit 100 and the circuit breaker 200, which has the characteristics of easy assembly and repair.

[0046] As shown, Figures 9-10 The plug-in circuit board 300 can not only be used for transmitting the electric signal of the current transformer 210, but also be used for taking power from the circuit breaker 200 by the control unit 100, and the plug-in circuit board 300 is provided with a third contact mechanism 330 for taking power on the side corresponding to the first contact mechanism 310.

[0047] The circuit breaker 200 is provided with a power terminal 250 and a load terminal 260 at two ends, the power terminal 250 is used for connecting a power end, and the load terminal 260 is used for connecting a load end, the second contact mechanism is arranged on one side of the power terminal 250, the cavity 240 on the shell 230 corresponds to the second contact mechanism and the power terminal 250, when the plug-in circuit board 300 is inserted into the slot along the thickness direction of the circuit breaker 200, the plurality of first contact mechanisms 310 and the third contact mechanisms 330 on the plug-in circuit board 300 are located in the cavities 240 of the corresponding circuit breakers 200, and the first contact mechanisms 310 are connected with the corresponding second contact mechanisms, and the third contact mechanisms 330 are connected with the corresponding power terminals 250.

[0048] The circuit connection structure of the circuit breaker can further reduce the number of wires on the basis of transmitting the electric signal of the current transformer 210 and taking power from the circuit breaker 200. It can be understood that more contact mechanisms are added on the basis of the first contact mechanisms 310 and the third contact mechanisms 330 on the plug-in circuit board 300 to realize more functions, but the number of wires is not increased.

[0049] As shown in Figure 3 The second plug-in circuit board 410 connected with the control unit 100 is further included, the second plug-in circuit board 410 is used for connecting the load terminals 260 of the plurality of circuit breakers 200, and the feedback signal is transmitted to the control unit 100 through the second plug-in circuit board 410 to indicate the main circuit on-off state of the plurality of circuit breakers 200, and the working principle of the second plug-in circuit board 410 is basically the same as that of the plug-in circuit board 300.

[0050] The fourth contact mechanism 440 corresponding to the load terminal 260 in the plurality of circuit breakers 200 is arranged on the second plug-in circuit board 410, the second cavities 420 are arranged on one side of the load terminal 260 along the thickness direction in the plurality of shells 230, the plurality of second cavities 420 are sequentially connected to form a second slot when the plurality of circuit breakers 200 are arranged side by side along the thickness direction, the second plug-in circuit board 410 can be inserted into the second slot along the thickness direction of the circuit breaker 200, the plurality of fourth contact mechanisms 440 on the second plug-in circuit board 410 are located in the second cavities 420 of the corresponding circuit breakers 200, and the fourth contact mechanisms 440 are connected with the corresponding load terminals 260.

[0051] Further, the plug-in circuit board 300 and the second plug-in circuit board 410 are respectively arranged perpendicularly to the control circuit board 110 in the control unit 100, one end of the plug-in circuit board 300 and / or the second plug-in circuit board 410 is connected to the control circuit board 110 through the plug pin 340 in the L-shaped structure, one end of the plug pin 340 is respectively perpendicular to the corresponding plug-in circuit board 300 and the second plug-in circuit board 410, the other end of the plug pin 340 is arranged parallel to the insertion direction of the corresponding plug-in circuit board 300 and the second plug-in circuit board 410, after the plug-in circuit board 300 is inserted along the thickness direction of the circuit breaker 200, the control unit 100 can also be inserted along the thickness direction of the circuit breaker 200 and sleeved on the plug pin 340. Of course, the plug-in circuit board 300 can also be connected to the control circuit board 110 in the form of elastic pins or direct welding.

[0052] As shown in Figure 1 The two embodiments of the application both include four circuit breakers 200 arranged on the left side and a control unit 100 arranged on the right side, wherein three circuit breakers 200 are connected to the L phase, one circuit breaker 200 is connected to the N phase, and the load connection terminal 250 at one end of the four circuit breakers 200 is connected to the control circuit board 110 of the control unit 100 through the second plug-in circuit board 410. Since the circuit breaker 200 connected to the N phase is not provided with a current transformer 210:

[0053] The current transformer 210 at one end of the three circuit breakers 200 connected to the L phase is connected to the control circuit board 110 of the control unit 100 through the plug-in circuit board 300, which is embodiment one.

[0054] The power connection terminal 250 and the current transformer 210 at one end of the three circuit breakers 200 connected to the L phase are connected to the control circuit board 110 of the control unit 100 through the plug-in circuit board 300, which is embodiment two.

[0055] Preferably, the circuit breaker 200 is provided with a removable baffle or plug-in baffle of the plugging cavity 240 and the second cavity 420.

[0056] Embodiment one

[0057] As shown in Figures 5-8 Embodiment one, the plug-in circuit board 300 is provided with three groups of first contact mechanisms 310, and each of the three circuit breakers 200 is provided with a group of second contact mechanisms, each group of second contact mechanisms includes two first elastic sheets 221 limited in the shell 230, one end of the two first elastic sheets 221 is respectively connected to two transformer wires 212 of the current transformer 210, and the other end of the two first elastic sheets 221 is respectively inserted into the corresponding cavity 240;

[0058] The first contact mechanism 310 on the plug-in circuit board 300 is two flat plate structure first pads 311, after the plug-in circuit board 300 passes through the cavity 240 overcoming the resistance of the first spring 221, two first springs 221 are respectively elastically contacted on the corresponding first pads 311 to realize connection.

[0059] Further, the two first springs 221 are respectively arranged in parallel with the two mutual inductor wires 212, the ends of the two mutual inductor wires 212 are respectively bent to form a bending part towards the corresponding first spring 221, the bending part passes through the corresponding welding hole and is welded with the corresponding first spring 221, the number of times of bending of the mutual inductor wire 212 for aligning the welding hole is reduced, and the length of the mutual inductor wire 212 extending out of the mutual inductor shell can be effectively reduced.

[0060] Further, the connection line of the two first springs 221 is arranged in parallel with the connection line of the ends of the two mutual inductor wires 212, so that the end of the mutual inductor wire 212 can be directly inserted into the corresponding welding hole, and the length of the mutual inductor wire 212 extending out of the mutual inductor shell is further reduced.

[0061] Specifically, the first spring 221 includes a flat part 221a and a bending part 221b formed by bending one end of the flat part 221a to the side, the other end of the flat part 221a is provided with a first welding hole 222 constituting the welding hole, the middle part of the flat part 221a is provided with a fixing hole 223, the mutual inductor wire 212 in the current transformer 210 is connected with the first welding hole 222, and the bending part 221b is inserted into the cavity 240 to cooperate with the first contact mechanism 310. The second contact mechanism of the embodiment is the first spring 221, which has the characteristics of simple structure and low cost.

[0062] Further, the shell 230 comprises an upper shell 231 and a lower shell 232 oppositely arranged along the thickness direction, the lower shell 232 is provided with a first fixed boss 233 corresponding to the middle part of the flat part 221a, the first fixed boss 233 is provided with a groove 234 and the groove 234 is provided with a fixed shaft 235, the upper shell 231 is provided with a pressing plate 236 arranged opposite to the fixed shaft 235, the fixed hole 223 on the flat part 221a is pressed in the groove 234 by the pressing plate 236, so that the two sides of the middle part of the flat part 221a are respectively limited by the groove 234, one end of the flat part 221a provided with the first welding hole 222 is suspended on the side of the first fixed boss 233 close to the current transformer 210, a space for accommodating the transformer lead 212 is left on the side of the first welding hole 222, so as to avoid the interference between the part of the transformer lead 212 of the current transformer 210 connected with the first welding hole 222 and the first fixed boss 233, one end of the flat part 221a provided with the bending part 221b is suspended on the side of the first fixed boss 233 away from the current transformer 210, a space for deformation of the bending part 221b is left on the side of the bending part 221b, and the side of the first fixed boss 233 away from the current transformer 210 constitutes the side wall of the type cavity 240, which not only avoids the interference between the bending part 221b and the first fixed boss 233, but also has the characteristics of simple structure and small volume.

[0063] In the embodiment, the middle part of the first elastic sheet 221 is pressed and limited on the first fixed boss 233 by the pressing plate 236, and the two ends of the first elastic sheet 221 are respectively suspended on the two sides, which not only reliably fixes the first elastic sheet 221, but also avoids the interference of the two ends of the first elastic sheet 221 without additional structure. In addition, the fixed shaft 235 arranged opposite to the pressing plate 236 passes through the fixed hole 223 to limit, which can more reliably fix the first elastic sheet 221 and ensure the compactness of the structure without increasing the occupied space. In addition, the middle part of the first elastic sheet 221 is pressed in the groove 234 by the pressing plate 236, and the two sides of the first elastic sheet 221 are respectively limited by the groove 234, which can further improve the reliability of fixing the first elastic sheet 221. Of course, the fixed shaft 235 or the groove 234 can not be provided, which belongs to the protection scope of the present application.

[0064] Further, the shell 230 is provided with a clamping rail cavity 237 below the power supply terminal 250 and the load terminal 260 at two ends respectively, and the two clamping rail cavities 237 are arranged at intervals to form a clamping rail groove 238 for limiting a clamping rail (not shown in the figure), which is usually arranged in a distribution box, and the clamping rail groove 238 can be clamped on the clamping rail to fix the circuit breaker 200 in the distribution box. One of the clamping rail cavities 237 is located on the side of the first fixing boss 233 away from the current transformer 210, and a second fixing boss is arranged in the clamping rail cavity 237 to form two opposite side walls of the mold cavity 240. The mold cavity 240 of the embodiment is arranged between the power supply terminal 250 and the clamping rail cavity 237 below the power supply terminal 250, and is formed by the clamping rail cavity 237. Of course, the mold cavity 240 can also be arranged in the clamping rail cavity 237, which all belong to the protection scope of the present application.

[0065] The second fixing boss includes a second upper fixing boss 238a integrally formed with the upper shell 231 and a second lower fixing boss 238b integrally formed with the lower shell 232, and the second upper fixing boss 238a and the second lower fixing boss 238b are arranged at intervals after the assembly of the upper shell 231 and the lower shell 232. The second lower fixing boss 238b is arranged at intervals on the side of the first fixing boss 233 away from the current transformer 210 and forms one end of the mold cavity 240. The upper shell 231 is provided with a first upper fixing boss 239 arranged opposite to the first fixing boss 233 on the side of the second upper fixing boss 238a close to the current transformer 210, and the first upper fixing boss 239 and the second upper fixing boss 238a are arranged at intervals to form the other end of the mold cavity 240.

[0066] The embodiment does not need to change the structure of the existing circuit breaker, and the clamping rail cavity 237 of the existing circuit breaker for installing the clamping rail forms part of the mold cavity 240 for accommodating the plug-in circuit board 300 and the electronic elements thereon, or the mold cavity 240 is arranged in the clamping rail cavity 237, that is, the first fixing boss 233 and the first upper fixing boss 239 can also be arranged in the clamping rail cavity 237, which directly utilizes the structure of the existing circuit breaker and has the characteristics of facilitating popularization. In addition, the second upper fixing boss 238a and the second lower fixing boss 238b of the second fixing boss can also be integrated and integrally formed by the upper shell 231 or the lower shell 232, which all belong to the protection scope of the present application.

[0067] Embodiment two

[0068] As Figures 9-12In the second embodiment, the plug-in circuit board 300 not only transmits electric signals through the first contact mechanism 310, but also takes power for the control unit 100 through the third contact mechanism 330. Since the circuit breaker 200 connected to the N pole is not provided with the current transformer 210, the number of the first contact mechanisms 310 is three, same as the first embodiment, and the number of the third contact mechanisms 330 is four, which can also take power from the circuit breaker 200 connected to the N pole. It can be understood that two plug-in circuit boards 300 can be provided, one of which is provided with only the first contact mechanism 310 for transmitting electric signals, and the other of which is provided with only the third contact mechanism 330 for taking power, both of which belong to the protection scope of the present application.

[0069] Referring to Figure 9 In the second embodiment, the second contact mechanism is a connecting circuit board 220, two solder holes are provided on the connecting circuit board 220, and the connecting circuit board 220 is provided with two second solder pads 225 which are in a flat plate structure and are electrically connected to the transformer lead 212 in the solder hole, respectively. The second solder pads 225 are connected to the control circuit board 110 through the plug-in circuit board 300, the plug-in circuit board 300 is provided with four groups of third contact mechanisms 330 and three groups of first contact mechanisms 310, each group of the first contact mechanisms 310 includes two second spring sheets 312 corresponding to the two second solder pads 225, respectively, and each group of the third contact mechanisms 330 includes a third spring sheet 313 corresponding to the power supply terminal 250. The transformer lead 212 of the current transformer 210 can be soldered and fixed after passing through the second solder hole 224, or can be fixed by using a plug-in part.

[0070] Different from the first embodiment, the second contact mechanism of the first embodiment is a spring sheet, and the first contact mechanism 310 is a solder pad, while the second embodiment is equivalent to reversing the positions of the spring sheet and the solder pad, which not only avoids setting the spring sheet structure on the power supply terminal 250, but also ensures the characteristics of simple structure and low cost, and the second contact mechanism is a circuit board, which can be assembled into an integral assembly with the current transformer 210, and then assembled into the shell 230, which has the characteristics of easy assembly.

[0071] Further, the power supply terminal 250 includes a terminal plate 251 limited in the shell 230, a movable terminal frame 252, and a rotatable terminal screw 253, one end of the terminal plate 251 is matched with the terminal frame 252 and the terminal screw 253, respectively, the other end of the terminal plate 251 is parallel to the second contact mechanism and is located on one side of the cavity 240, and the center line of the terminal plate 251 and the second contact mechanism is parallel to the length direction of the circuit breaker 200, that is, perpendicular to the insertion direction of the plug-in circuit board 300.

[0072] Specifically, the terminal block 251 is a U-shaped structure. The terminal block 251 includes an upper terminal portion 251a and a lower terminal portion 251c that are arranged opposite to each other, and a middle terminal portion 251b connected between one end of the upper terminal portion 251a and the lower terminal portion 251c. The upper terminal portion 251a cooperates with the terminal frame 252 and the terminal screw 253. The length direction of the upper terminal portion 251a is parallel to the axis of the current transformer 210 and is arranged on one side of the current transformer 210 along the length direction of the circuit breaker 200. The lower terminal portion 251b is connected to the upper terminal portion 251a and the lower terminal portion 251c. 51c is arranged in parallel with the length direction of the second contact mechanism and is arranged on one side of the second contact mechanism along the length direction of the circuit breaker 200, and the lower wiring portion 251c and the second contact mechanism are both located on one side of the cavity 240. The wiring frame 252 can be movably sleeved on the upper wiring portion 251a, and the wiring screw 253 passes through the threaded hole on the wiring frame 252 and rests on the upper wiring portion 251a. When the wiring screw 253 rotates, it is circumferentially limited, and the wiring frame 252 is driven to move by threaded engagement with the wiring frame 252 to fix the external wire.

[0073] Furthermore, the connecting circuit board 220 is arranged perpendicular to the transformer wire 212, which reduces the number of times the transformer wire 212 is bent to align with the welding hole, and can effectively reduce the length of the transformer wire 212 extending out of the transformer housing.

[0074] Furthermore, the connecting circuit board 220 is arranged parallel to the axis of the current transformer 210, and the length direction of the connecting circuit board 220 is arranged parallel to the connection line of the ends of the two transformer wires 212, so that the ends of the transformer wires 212 can be directly inserted into the corresponding welding holes, further reducing the length of the transformer wires 212 extending out of the transformer housing.

[0075] Furthermore, two U-shaped mounting grooves 101 are provided in the shell 230 and are arranged opposite to each other. The two ends of the connecting circuit board 220 are respectively inserted into the two mounting grooves 101 for fixation. The two ends of the two mounting grooves 101 are respectively spaced to form a space for avoiding the transformer wire 212 and the second spring clip 312.

[0076] like Figures 12-13 As shown, the second spring piece 312 and the third spring piece 313 have the same structure and are both made of beryllium copper, which has the characteristics of balanced force and not easy to tilt. Figure 12The second elastic sheet 312 and the third elastic sheet 313 respectively comprise a V-shaped elastic part 314, the elastic part 314 is reversely buckled on the plug-in circuit board 300, the middle part of the elastic part 314 is protruded away from the plug-in circuit board 300, one end of the elastic part 314 is bent to form an insertion part 315 close to the plug-in circuit board 300, the other end of the elastic part 314 is bent to form a sliding part 316 away from the plug-in circuit board 300, the connection part of the sliding part 316 and the elastic part 314 is slidingly matched with the plug-in circuit board 300, the middle part of the insertion part 315 is provided with a U-shaped accommodating slot 317, the insertion part 315 is correspondingly provided with insertion legs 318 passing through the plug-in circuit board 300 on both sides of the accommodating slot 317, the insertion legs 318 are welded and fixed with the plug-in circuit board 300, the two side edges of the V-shaped elastic part 314 are both provided in an inclined manner, which can play a transition role during plugging, preventing the plug-in circuit board 300 from being deformed and damaged during plugging.

[0077] Preferably, the middle part of the elastic part 314 is provided with an avoiding slot 319, which can reduce the contact area of the second elastic sheet 312 and the third elastic sheet 313 respectively matched with the second contact mechanism and the power terminal 250, further preventing the plug-in circuit board 300 from being deformed and damaged during plugging.

[0078] As shown in the figure, Figure 14 The second plug-in circuit board 410 has basically the same working principle as the plug-in circuit board 300, and the second plug-in circuit board 410 is provided with a fourth elastic sheet 421 for connecting the load terminal 260.

[0079] The structure of the load terminal 260 is basically the same as that of the power terminal 250, and the difference lies in the structure of the terminal plate 251. The load terminal 260 comprises a Z-shaped load terminal plate 261, and a load terminal frame and a load terminal (not shown in the figure) matched with one end of the load terminal plate 261. The other end of the load terminal plate 261 is connected with the coil of the electromagnetic tripping mechanism 430, and the fourth elastic sheet 421 on the second plug-in circuit board 410 is connected with the side of the middle part of the load terminal plate 261 close to the electromagnetic tripping mechanism 430. Preferably, the fourth elastic sheet 421 has the same structure as the second elastic sheet 312 and the third elastic sheet 313, and has the transition and convenient plugging functions.

[0080] The above is a further detailed description of the present application in combination with specific preferred embodiments, and cannot be regarded as the specific implementation of the present application. For ordinary skilled persons in the technical field to which the present application belongs, some simple deductions or replacements can be made without departing from the concept of the present application, and all of them shall be regarded as falling within the protection scope of the present application.

Claims

1. A circuit connection structure of a circuit breaker, comprising a control unit (100) and a plurality of circuit breakers (200), characterized in that: A current transformer (210) and a second contact mechanism connected to the current transformer (210) are provided in a housing (230) of the circuit breaker (200), and a through cavity (240) is provided on one side of the housing (230) corresponding to the second contact mechanism along a thickness direction. The device further comprises a plug-in circuit board (300) connected to the control unit (100); the plug-in circuit board (300) is provided with first contact mechanisms (310) corresponding to the plurality of circuit breakers (200); when the plurality of circuit breakers (200) are arranged side by side in a thickness direction, the cavities (240) on the plurality of circuit breakers (200) are connected end to end in sequence to form a slot; the plug-in circuit board (300) can be inserted into the slot along the thickness direction of the circuit breaker (200), so that the plurality of first contact mechanisms (310) on the plug-in circuit board (300) are respectively located in the cavities (240) of the corresponding circuit breakers (200), and the first contact mechanisms (310) are connected to the second contact mechanisms of the corresponding circuit breakers (200); The invention also includes a second pluggable circuit board (410) connected to the control unit (100), one end of the circuit breaker (200) is provided with a load terminal (260), and the second pluggable circuit board (410) is provided with fourth contact mechanisms (440) corresponding to the load terminal (260) in the plurality of circuit breakers (200). The plurality of housings (230) are provided with second cavities (420) along the thickness direction on one side of the load terminal (260). When the plurality of circuit breakers (200) are arranged side by side along the thickness direction, the plurality of second cavities (420) are connected end to end in sequence to form a second slot. The second pluggable circuit board (410) can be inserted into the second slot along the thickness direction of the circuit breaker (200), so that the plurality of fourth contact mechanisms (440) on the second pluggable circuit board (410) are respectively located in the second cavities (420) of the corresponding circuit breakers (200), and the fourth contact mechanisms (440) are connected to the corresponding load terminal (260).

2. The circuit connection structure of the circuit breaker according to claim 1, characterized in that: A power connection terminal (250) is provided at one end of the circuit breaker, and a cavity (240) on the housing (230) corresponds to the second contact mechanism and the power connection terminal (250).

3. The circuit connection structure of the circuit breaker according to claim 1 or 2, characterized in that: The housing (230) is provided with power connection terminals (250) and load connection terminals (260) at both ends, respectively. The housing (230) is provided with rail cavities (237) below the power connection terminals (250) and the load connection terminals (260) at the two ends, respectively. The two rail cavities (237) are arranged at intervals to form a rail groove (238) for limiting the rail. The cavity (240) is arranged between the power connection terminal (250) and the rail cavity (237) below it, or is arranged in the rail cavity (237) below the power connection terminal (250).

4. The circuit connection structure of the circuit breaker according to claim 2, wherein: The power connection terminal (250) comprises a U-shaped connection board (251) limited in the housing (230), the connection board (251) comprising an upper connection portion (251a) and a lower connection portion (251c) arranged opposite to each other, and a middle connection portion (251b) connected between one end of the upper connection portion (251a) and the lower connection portion (251c), the upper connection portion (251a) cooperates with a connection frame (252) and a connection screw (253), the length direction of the upper connection portion (251a) is arranged parallel to the axis of the current transformer (210), and is arranged on one side of the current transformer (210) along the length direction of the circuit breaker, the length direction of the lower connection portion (251c) is arranged parallel to the second contact mechanism, and is arranged on one side of the second contact mechanism along the length direction of the circuit breaker, and the lower connection portion (251c) and the second contact mechanism are both located on one side of the cavity (240).

5. The circuit connection structure of the circuit breaker according to claim 2, characterized in that: The second contact mechanism is a connection circuit board (220), and is provided with two second welding holes (224) respectively connected to the two ends of the transformer wire (212) in the current transformer (210), and two second welding pads (225) of a flat plate structure respectively corresponding to the second welding holes (224).

6. The circuit connection structure of the circuit breaker according to claim 1, characterized in that: The second contact mechanism comprises two first elastic pieces (221) limited in the housing (230), the first elastic piece (221) comprising a straight portion (221a) and a bent portion (221b) formed by bending one end of the straight portion (221a) toward the side, the other end of the straight portion (221a) being provided with a first welding hole (222), the middle of the straight portion (221a) being provided with a fixing hole (223), and the two ends of the transformer wire (212) of the current transformer (210) being respectively connected to the first welding holes (222); the housing (230) comprising an upper housing (231) and a lower housing (232) being arranged opposite to each other in the thickness direction, the lower housing (232) being provided with a first fixing boss (233) corresponding to the middle of the straight portion (221a), the first fixing boss (233) being provided with a groove (234), and the groove (234) being provided with a fixing shaft ( 235), a pressing plate (236) is provided on the upper shell (231) and is staggered with the fixed shaft (235); after the fixing hole (223) on the straight portion (221a) passes through the fixed shaft (235), it is pressed into the groove (234) by the pressing plate (236), so that the two side edges of the middle of the straight portion (221a) are respectively limited by the groove (234); one end of the first welding hole (222) of the straight portion (221a) is suspended on the side of the first fixing boss (233) close to the current transformer (210), and space for accommodating the transformer wire (212) is reserved on the side of the first welding hole (222); one end of the bent portion (221b) of the straight portion (221a) is suspended on the side of the first fixing boss (233) away from the current transformer (210), and space for deformation of the bent portion (221b) is reserved on the side of the bent portion (221b).

7. The circuit connection structure of the circuit breaker according to claim 6, characterized in that: The housing (230) is provided with a rail cavity (237) for limiting the rail corresponding to the lower portion of the power connection terminal (250), and the rail cavity (237) is provided with a second upper fixed boss (238a) integrally formed with the upper housing (231), and a second lower fixed boss (238b) integrally formed with the lower housing (232). The second upper fixed boss (238a) and the second lower fixed boss (238b) are spaced apart after the upper housing (231) and the lower housing (232) are assembled, wherein the second lower fixed boss (238a) and the second lower fixed boss (238b) are spaced apart. The platform (238b) is spaced apart on a side of the first fixed boss (233) away from the current transformer (210) and constitutes one end of the cavity (240); the upper shell (231) is provided with a first upper fixed boss (239) corresponding to the side of the second upper fixed boss (238a) close to the current transformer (210) and is arranged opposite to the first fixed boss (233); the first upper fixed boss (239) and the second upper fixed boss (238a) are spaced apart to constitute the other end of the cavity (240).

8. The circuit connection structure of the circuit breaker according to claim 1, wherein: A load terminal (260) is provided at one end of the circuit breaker, and the housing (230) is provided with a second cavity (420) penetrating along the thickness direction on one side corresponding to the load terminal (260).

9. The circuit connection structure of the circuit breaker according to claim 1, wherein: One end of the circuit breaker (200) is provided with a power connection terminal (250); the plug-in circuit board (300) is provided with a third contact mechanism (330) corresponding to the power connection terminal (250) on one side of the first contact mechanism (310); when the plug-in circuit board (300) is inserted into the slot so that the first contact mechanism (310) is connected to the corresponding second contact mechanism, the third contact mechanism (330) is connected to the corresponding power connection terminal (250).

10. The circuit connection structure of the circuit breaker according to claim 1, wherein: The pluggable circuit board (300) and / or the second pluggable circuit board (410) are respectively arranged perpendicularly to the control circuit board (110) in the control unit (100); one end of the pluggable circuit board (300) and the second pluggable circuit board (410) are respectively connected to the control circuit board (110) via a plug pin (340) with an L-shaped plug pin structure; one end of the plug pin (340) is respectively perpendicular to the corresponding pluggable circuit board (300) and the second pluggable circuit board (410); and the other end of the plug pin (340) is respectively arranged parallel to the insertion direction of the corresponding pluggable circuit board (300) and the second pluggable circuit board (410).

11. The circuit connection structure of the circuit breaker according to claim 9, wherein: The first contact mechanism (310) includes two second elastic pieces (312), or the first contact mechanism (310) is two first solder pads (311) of a flat plate structure; the third contact mechanism (330) includes a third elastic piece (313).

12. The circuit connection structure of the circuit breaker according to claim 11, characterized in that: The second elastic piece (312) and the third elastic piece (313) have the same structure. The second elastic piece (312) and the third elastic piece (313) respectively include an elastic portion (314) in a V-shaped structure. The elastic portion (314) is buckled on the plug-in circuit board (300) so that the middle portion of the elastic portion (314) is convex away from the plug-in circuit board (300). The middle portion of the elastic portion (314) is provided with an avoidance groove (319). One end of the elastic portion (314) is bent close to the plug-in circuit board (300) to form an insertion portion (315). The other end of the elastic portion (314) is bent away from the plug-in circuit board (300) to form a sliding portion (316). The connection between the sliding portion (316) and the elastic portion (314) is slidably matched with the plug-in circuit board (300). A U-shaped clearance groove (317) is provided in the middle of the insertion portion (315). The insertion portion (315) forms insertion pins (318) passing through the plug-in circuit board (300) on both sides of the clearance groove (317). The insertion pins (318) are welded and fixed to the plug-in circuit board (300).

13. The circuit connection structure of a circuit breaker according to claim 1, wherein: The second pluggable circuit board (410) is provided with a fourth spring piece (421) for connecting to the load terminal (260); the fourth spring piece (421) on the second pluggable circuit board (410) is connected to a side of the middle of the load terminal board (261) close to the electromagnetic tripping mechanism (430).

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