A multi-breakpoint circuit breaker

Abstract

A multi-breakpoint circuit breaker comprises a load (1) and a circuit breaker body (2), wherein the circuit breaker body (2) is connected to the load (1), and each end of the load (1) has at least one disconnecting pole. The circuit breaker body (2) is characterized in that a switching conductor (302) is connected to the circuit breaker body (2) and can convert the opposite-direction currents in at least two disconnecting poles (b) directly connected to the two ends of the load (1) into the same-direction currents, thereby improving the disconnecting capacity of the multi-breakpoint circuit breaker.

Description

Technical Field

[0001] The present invention belongs to the technical field of low-voltage electrical appliances, and in particular relates to a multi-breakpoint circuit breaker. Background Art

[0002] The development of new energy technologies has placed higher demands on low-voltage electrical components, especially in photovoltaic power supply DC systems, where the rated operating voltage of low-voltage electrical components can reach as high as DC1500V. Using multiple disconnect points in series can improve the circuit breaker's interrupting performance. Furthermore, when all disconnecting poles of a DC molded case circuit breaker are located at one end of the load, connecting the load side of one disconnecting pole in series with the power side of another disconnecting pole can ensure that the current direction of all disconnecting poles is consistent.

[0003] However, when a DC molded case circuit breaker has disconnecting poles at both ends of the load connected, the currents in the two disconnecting poles connected to the load flow in opposite directions, causing the arc currents at the breakpoints of the two disconnecting poles to flow in opposite directions, causing the arcs to repel each other. If the two arcs move at different speeds, the slower arc will be repelled by the faster arc and may not reach the arc extinguishing grid. Summary of the Invention

[0004] The purpose of the present invention is to address the defect that when there are disconnecting poles at both ends of the load connected to the above-mentioned existing DC molded case circuit breaker, the current directions in the two disconnecting poles connected to the load are opposite, so that the arc current directions in the break points of the two disconnecting poles are opposite, causing the arcs to repel each other, thereby reducing the breaking capacity of the circuit breaker. The present invention provides a multi-breakpoint circuit breaker, which uses a switching conductor to make the current directions in the disconnecting poles at both ends of the load directly connected to the multi-breakpoint circuit breaker the same, thereby improving the breaking performance of the circuit breaker.

[0005] Technical Solution

[0006] To achieve the above technical objectives, the present invention provides a multi-breakpoint circuit breaker, comprising a load 1 and a circuit breaker body, wherein the circuit breaker body is connected to the load, and each end of the load has at least one disconnecting pole. The circuit breaker body is characterized in that a transition conductor is connected to the circuit breaker body, which can convert the opposite-direction currents in the at least two disconnecting poles directly connected to the two ends of the load into the same-direction currents, thereby improving the breaking capacity of the multi-breakpoint circuit breaker.

[0007] The circuit breaker body includes at least one disconnecting pole and two disconnecting poles, and the two ends of the contact system of the disconnecting pole one are correspondingly provided with a wiring terminal one and a wiring terminal two, and the two ends of the contact system of the disconnecting pole two are correspondingly provided with a wiring terminal three and a wiring terminal four. At least the one and two disconnecting poles are directly connected to the load, and the two disconnecting poles are a switching pole. The two ends of the contact system of the switching pole are correspondingly provided with a connection part one located on the power supply side and a connection part two located on the load side. The connection part one and the wiring terminal on the power supply side are electrically separated, and the connection part two and the wiring terminal on the load side are electrically separated. The switching pole and the switching conductor can convert the opposite-direction currents in the at least two disconnecting poles directly connected to the two ends of the load into the same-direction currents, thereby improving the breaking capacity of the circuit breaker.

[0008] Furthermore, it also includes a corresponding number of short-circuiting conductors, which are capable of short-circuiting the disconnecting pole directly connected to the load and other disconnecting poles located on the same side of the load as the disconnecting pole;

[0009] The number of the short-circuiting conductors corresponds to the number of disconnecting poles that are not directly connected to the two ends of the load. Through the switching poles, switching conductors and short-circuiting conductors, the currents in all disconnecting poles in a circuit breaker with three or more disconnecting poles can be made to be in the same direction, thereby improving the disconnecting capacity of the circuit breaker.

[0010] Furthermore, the transfer conductor includes a first transfer conductor and a second transfer conductor, the first transfer conductor is provided with a first terminal and a second terminal at two ends respectively, and the second transfer conductor is provided with a third terminal and a fourth terminal at two ends respectively;

[0011] One end of the first transfer conductor is connected to the load-side terminal 4 of the transfer pole directly connected to the load at one end of the load, and the other end is connected to the connection part 1 of the transfer pole on the power supply side. One end of the second transfer conductor is connected to the load-side connection part 2 of the transfer pole, and the other end is connected to the power supply-side terminal of the disconnecting pole at the same end as the load.

[0012] Furthermore, one end of the load is connected to the wiring terminal of the disconnecting pole 1 located on the load side, and the other end of the load is connected to the wiring terminal of the disconnecting pole 2 located on the load side; one end of the power supply is connected to the power supply side wiring terminal of one of the disconnecting poles located at the same end as the load, and the other end of the power supply is connected to the power supply side wiring terminal of one of the disconnecting poles located at the same end as the load.

[0013] Furthermore, the other end of the second transfer conductor is connected to the third connection terminal of the transfer pole located on the power supply side.

[0014] Furthermore, one end of the load is connected to the second terminal on the load side of the disconnecting pole one, and the other end of the load is connected to the fourth terminal on the load side of the disconnecting pole two; one end of the power supply is connected to the first terminal on the power supply side of the disconnecting pole one, and the other end of the power supply is connected to the third terminal on the power supply side of the switching pole.

[0015] Furthermore, one end of each of the corresponding number of short-circuit conductors is connected to a connection terminal on the load side of a disconnecting pole, and the other end is connected to a connection terminal on the power supply side of another disconnecting pole located at the same end of the load.

[0016] Furthermore, at least the connection terminals at both ends of the first disconnecting pole and the second disconnecting pole are located outside the cavity of the circuit breaker body.

[0017] Furthermore, two ends of the load are located on one side of the circuit breaker body, and two ends of the power supply are located on the other side of the circuit breaker body.

[0018] Furthermore, it also includes a series mounting plate, which is mounted on the bottom of the circuit breaker body, and a corresponding number of short-circuit conductors and transfer conductors are located in the space formed by the series mounting plate and the bottom of the circuit breaker body.

[0019] Furthermore, an insulating member is provided between the first transition conductor and the second transition conductor to insulate the two.

[0020] Furthermore, a corresponding number of short-circuit conductors and transfer conductors are pre-installed in the series installation plate.

[0021] Furthermore, a corresponding number of short-circuit conductors and transition conductors are not pre-installed in the series mounting plate. During installation, after the corresponding number of short-circuit conductors and transition conductors are matched with the circuit breaker body, the series mounting plate is matched with the circuit breaker body.

[0022] Furthermore, a portion of the corresponding number of short-circuit conductors and transfer conductors are not pre-installed in the series installation plate, while the remaining portion is pre-installed in the series installation plate. During installation, the conductors not pre-installed in the series installation plate are matched with the circuit breaker body, and then the series installation plate is matched with the circuit breaker body.

[0023] Beneficial effects

[0024] The present invention provides a multi-breakpoint circuit breaker. This addresses the drawback of existing multi-breakpoint molded case circuit breakers, where, when both ends of a load have disconnecting poles, the currents in the disconnecting poles directly connected to the load have opposite directions. This results in arc currents in opposite directions at the breakpoints of the two disconnecting poles directly connected to the load, causing arcs to repel each other, thereby reducing the circuit breaker's breaking capacity. This multi-breakpoint circuit breaker uses a switching conductor to align the currents in the disconnecting poles at both ends of the multi-breakpoint circuit breaker, thereby improving the circuit breaker's breaking performance. Furthermore, the two power supply terminals are located on one side of the circuit breaker, while the two load terminal terminals are located on the other side, providing user convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Attachment Figure 1a This is a wiring diagram of a two-pole circuit breaker connection circuit in Example 1 of the present invention;

[0026] Attachment Figure 1b 1 is a perspective schematic diagram of a two-pole circuit breaker in Example 1 of the present invention;

[0027] Attachment Figure 1c This is a schematic diagram of the transfer pole structure in Example 1 of the present invention;

[0028] Attachment Figure 1d It is attached Figure 1b Bottom view after removing the series mounting plate;

[0029] Attachment Figure 1e This is a first schematic diagram of the first transfer conductor structure in Example 1 of the present invention;

[0030] Attachment Figure 1f This is a second structural diagram of the first transfer conductor in embodiment 1 of the present invention;

[0031] Attachment Figure 1g This is a first schematic diagram of the second transfer conductor structure in Example 1 of the present invention;

[0032] Attachment Figure 1h This is a second structural diagram of the second transfer conductor in embodiment 1 of the present invention;

[0033] Attachment Figure 1i This is a schematic diagram of the insulating member structure in Example 1 of the present invention;

[0034] Attachment Figure 1j This is a second schematic diagram of the insulating member structure in Example 1 of the present invention;

[0035] Attachment Figure 2a This is a wiring diagram of a three-pole circuit breaker connection circuit in Example 2 of the present invention;

[0036] Attachment Figure 2b 1 is a perspective schematic diagram of a three-pole circuit breaker in Example 2 of the present invention;

[0037] Attachment Figure 2c This is a schematic diagram of the installation of the serially connected mounting plate, short-circuit conductor, transition conductor, and insulating member in Example 2 of the present invention;

[0038] Attachment Figure 2d It is attached Figure 2c Schematic diagram of the decomposition.

[0039] Attachment Figure 3a This is a wiring diagram 1 of a three-pole circuit breaker connection circuit in Example 4 of the present invention;

[0040] Attachment Figure 3b This is the second wiring diagram of the three-pole circuit breaker connection circuit in Example 4 of the present invention;

[0041] Attachment Figure 4a This is a wiring diagram 1 of a four-pole circuit breaker connection circuit in Example 5 of the present invention;

[0042] Attachment Figure 4b This is a second wiring diagram of a four-pole circuit breaker connection circuit in Example 5 of the present invention;

[0043] Attachment Figure 5 This is a schematic diagram of the connection circuit of the rotary double-breakpoint contact system in Example 6 of the present invention;

[0044] Attachment Figure 6 This is a schematic diagram of the connection circuit of the bridge-type double-breakpoint contact system in Example 7 of the present invention. DETAILED DESCRIPTION

[0045] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0046] In the description of the present invention, it should be noted that the terms "inner," "outer," "front," "rear," "left," "right," "normal side," "standby side," and so forth, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0047] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0048] The present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0049] When both ends of the load connected to the existing multi-breakpoint molded case circuit breaker have disconnecting poles, the current directions in the disconnecting pole directly connected to the load are opposite, so that the arc current directions in the breakpoints of the two disconnecting poles directly connected to the load are opposite, causing the arcs to repel each other, thereby reducing the circuit breaker's breaking capacity. In order to solve this problem, the present invention provides a multi-breakpoint circuit breaker. At the same time, for more accurate description, this embodiment defines the pole with the contact system as the disconnecting pole, as shown in the attached figure. Figure 1a As shown, it includes a load 1 and a circuit breaker body 2, the circuit breaker body 2 is connected to the load 1, and each end of the load 1 has at least one disconnecting pole. The circuit breaker body 2 is connected to a switching conductor 302, which can convert the opposite-direction currents in at least two disconnecting poles b directly connected to the two ends of the load 1 into the same-direction currents, thereby improving the breaking capacity of the multi-breakpoint molded case circuit breaker.

[0050] The above-mentioned direct connection includes that the disconnecting pole connected to the load is connected to the load through a conductor, the disconnecting pole is directly connected to the load, and the disconnecting pole is connected to the load through a switching conductor.

[0051] In order to achieve the above technical objectives, this embodiment is described by taking a two-pole circuit breaker as an example. The power supply side and the load side are respectively on the outermost sides of the circuit breaker body. Specifically, Figure 1b and 1cAs shown, the circuit breaker body 2 includes at least a first disconnecting pole 202 and a second disconnecting pole 202', and at least the first disconnecting pole 202 and the second disconnecting pole 202' are electrically separated. In this embodiment, there is a disconnecting pole b at each end of the load 1, and the first disconnecting pole b at each end of the load 1 refers to the first disconnecting pole 202 and the second disconnecting pole 202'. The contact system of the first disconnecting pole 202 is provided with terminal 1 202a and terminal 2 202b at both ends, respectively. The contact system of the second disconnecting pole 202' is provided with terminal 3 202c and terminal 4 202d at both ends. The first disconnecting pole 202 and the second disconnecting pole 202' are connected to the load 1. The second disconnecting pole 202' is a switching pole 202e. The contact system of the switching pole 202e is provided with a connection portion 1 202e01 located on the power supply side and a connection portion 2 202e02 located on the load side at both ends. The connection portion 1 202e01 and terminal 3 202c are electrically separated, and the connection portion 2 202e02 and terminal 4 202d are electrically separated. In this embodiment, the connection terminals at both the first disconnecting pole 202 and the second disconnecting pole 202' are located outside the cavity of the circuit breaker body 2. Two ends of the load 1 are located on one side of the circuit breaker body 2 , and two ends of the power supply 4 are located on the other side of the circuit breaker body 2 .

[0052] One end of the transfer conductor 302 is connected to the corresponding connection portion of the corresponding transfer pole 202e, and the other end is connected to the connection terminal on the corresponding side of the corresponding disconnecting pole at the same load end as the corresponding transfer pole 202e. Figures 1b to 1j As shown, the transition conductor 302 includes a first transition conductor 302a and a second transition conductor 302b. An insulator 6 is provided between the first transition conductor 302a and the second transition conductor 302b to provide insulation between them. The first transition conductor 302a has terminal 1 302a01 and terminal 2 302a02 at its ends, respectively. The second transition conductor 302b has terminal 3 302b01 and terminal 4 302b02 at its ends, respectively. One end of the first transition conductor 302a is connected to terminal 4 202d on the load side of a transition pole 202e located at one end of the load 1 and directly connected to the load, and the other end is connected to connection portion 1 202e01 on the power supply side of the transition pole 202e. The second transition conductor 302b has one end connected to connection portion 202e02 on the load side of the transition pole 202e, and the other end is connected to a terminal on the power supply side of a disconnect pole located at the same end as the load. Specifically in this embodiment, the other end of the second transfer conductor 302b is connected to the third connection terminal 202c of the transfer pole 202e located on the power supply side.

[0053] One end of the load 1 is connected to the load-side terminal of the disconnecting pole 1 202, and the other end of the load 1 is connected to the load-side terminal of the disconnecting pole 202'; one end of the power supply 4 is connected to the power-side terminal of one of the disconnecting poles of the disconnecting pole 1 202 located at the same end as the load, and the other end of the power supply 4 is connected to the power-side terminal of one of the disconnecting poles of the adapter pole 202e located at the same end as the load. Specifically, in this embodiment, one end of the load 1 is connected to the load-side terminal 2 202b of the disconnecting pole 1 202, and the other end of the load 1 is connected to the load-side terminal 4 202d of the disconnecting pole 202'; one end of the power supply 4 is connected to the power-side terminal 1 202a of the disconnecting pole 1, and the other end of the power supply 4 is connected to the power-side terminal 3 202c of the adapter pole 202e.

[0054] Specifically in this embodiment, the two ends of the load 1 are located on one side of the circuit breaker body 2, that is, the second terminal 202b and the fourth terminal 202d are located on one side of the circuit breaker body 2, that is, the Figure 1b The two ends of the power supply 4 are located on the other side of the circuit breaker body 2, that is, the connection terminal 1 202a and the connection terminal 3 202c are located on the other side of the circuit breaker body 2, that is, the accompanying drawings. Figure 1b The upper side, that is, the power supply side. The terminal 1 202a, terminal 2 202b, terminal 3 202c and terminal 4 202d are located on the outermost side of the circuit breaker body 2. Figure 1b , that is, the connection terminal 1 202a and the connection terminal 2 202b are located at the rightmost side of the circuit breaker body 2 , and the connection terminal 3 202c and the connection terminal 4 202d are located at the leftmost side of the circuit breaker body 2 .

[0055] This embodiment also includes a series mounting plate 5, which is mounted on the bottom of the circuit breaker body 2. The transfer conductor 302 is located in the space formed by the series mounting plate 5 and the bottom of the circuit breaker body 2. The specific assembly implementation process of this embodiment is as follows: Figures 1c to 1jAs shown, first install the second transition conductor 302b. Specifically, the moving contact connection portion 203 (i.e., connection portion 202e02) has a threaded hole 1 203a. Use screws to connect one end 302b02 of the second transition conductor 302b to the moving contact connection portion 203 from the bottom of the circuit breaker body 2. The other end 302b01 of the second transition conductor 302b aligns with the third terminal 202c. Then, the insulator 6 is nested onto the second transition conductor 302b. Next, install the first transition conductor 302a. Specifically, the stationary contact connection portion 201 (i.e., connection portion 1 202e01) has a threaded hole 201a. Use screws to connect one end 302a01 of the first transition conductor 302a to the stationary contact connection portion 201 from the bottom of the circuit breaker body 2. The other end 302a02 of the first transition conductor 302a aligns with the fourth terminal 202d. Finally, install the series mounting plate 5. Specifically, a hook is provided on the series mounting plate 5, and a slot is provided on the bottom of the circuit breaker body 2, connecting the two together as a single unit. Alternatively, the two can be bonded together to form a single unit. Alternatively, countersunk through-holes are provided on the series mounting plate 5, and blind holes are provided on the bottom of the circuit breaker body 2, and the two can be connected together as a single unit using self-tapping screws to complete the installation. After connecting the power supply and load, the other end 302b01 of the second transfer conductor 302b is connected to the power supply via terminal 3 202c, and the other end 302a02 of the first transfer conductor 302a is connected to the load via terminal 4 202d. Terminal 1 202a is connected to the power supply, and terminal 2 202b is connected to the load. The current flowing through disconnecting pole 1 202 and disconnecting pole 2 202' has the same direction.

[0056] Example 2

[0057] As attached Figure 2a and 2b As shown, in this embodiment, a three-pole circuit breaker is used as an example for explanation, and also includes a corresponding number of short-circuiting conductors 301. The corresponding number of short-circuiting conductors 301 can short-circuit the disconnecting pole b directly connected to the load 1 and other disconnecting poles located on the same side of the load 1 as the disconnecting pole b; the number of the short-circuiting conductors 301 corresponds to the number of disconnecting poles that are not directly connected to the two ends of the load 1. Through the switching pole 202e, the switching conductor 302 and the short-circuiting conductor 301, the current in all disconnecting poles in the circuit breaker with three or more disconnecting poles can be made to be in the same direction, thereby improving the breaking capacity of the circuit breaker. One end of each of the corresponding number of short-circuiting conductors 301 is connected to the terminal on the load side of a disconnecting pole, and the other end is connected to the terminal on the power supply side of another disconnecting pole located at the same end of the load. In this embodiment, as shown in the attached Figure 2a and 2bAs shown, it includes a disconnecting pole 1 202, a disconnecting pole 202' and a disconnecting pole 3 202", wherein the two ends of the disconnecting pole 3 202" are respectively provided with a wiring terminal 5 202f and a wiring terminal 6 202g, the disconnecting pole 202' is a switching pole 202e, and one end of the short-circuit conductor 301 is connected to the wiring terminal 1 202a on the power supply side of the disconnecting pole 1 202, and the other end is connected to the wiring terminal 6 202g on the load side of the disconnecting pole 3 202" located at the same end of the disconnecting pole 202.

[0058] In this embodiment, a corresponding number of short-circuit conductors 301 and transition conductors 302 are located in the space formed by the series mounting plate 5 and the bottom of the circuit breaker body 2. Figure 2c and 2d As shown, a corresponding number of shorting conductors 301 and transition conductors 302 are pre-installed in the serial mounting plate 5. The shorting conductors 301 and the first transition conductor 302a are embedded in the serial mounting plate 5. The insulating member 6 is embedded in the serial mounting plate 5, and the second transition conductor 302b is embedded in the insulating member 6. This makes the serial mounting plate 5, the shorting conductors 301, the first transition conductor 302a, the insulating member 6, and the second transition conductor 302b form a single unit. The insulating member 6 insulates the first transition conductor 302a and the second transition conductor 302b from each other.

[0059] Threaded holes are provided at the lower end of the first transition conductor 302a, the upper end of the second transition conductor 302b, and both ends of the shorting conductor 301 where they mate with the corresponding wiring terminals. During wiring, the series mounting plate 5 is placed at the bottom of the circuit breaker body 2. Bolts are inserted through the through-holes in the wiring terminals and screwed into the threaded holes at both ends of the shorting conductor 301, electrically connecting the corresponding wiring terminals to the shorting conductor 301. The static contact connection portion 201 (i.e., connection portion 1 202e01) has threaded holes. The upper end of the first transition conductor 302a and the series mounting plate 5 have corresponding through-holes. Screws are inserted through the through-holes in the series mounting plate 5 to electrically connect the upper end of the first transition conductor 302a to the static contact connection portion 201. The moving contact connection portion 203 (i.e., connection portion 202e02) has a threaded hole. The lower end of the second transfer conductor 302b and the series mounting plate 5 have corresponding through-holes. Screws are inserted through the through-holes in the series mounting plate 5 to electrically connect the lower end of the second transfer conductor 302b to the moving contact connection portion. Finally, the holes in the series mounting plate 5 are sealed with cover plate 1 7 and cover plate 2 8. After connecting to the power supply and load, the upper end of the second transfer conductor 302b is connected to the power supply via terminal 3 202c, and the lower end of the first transfer conductor 302a is connected to the load via terminal 4 202d. Terminal 5 202f on the power supply side of disconnect pole 3 202" is connected to the power supply, while terminal 2 202b is connected to the load. The current flowing through all three disconnect poles has the same direction.

[0060] Example 3

[0061] In this embodiment, as shown in the attached Figure 2c As shown, a portion of the corresponding number of shorting conductors 301 and transition conductors 302 are not pre-installed in the series mounting plate 5, while the remaining portions are pre-installed in the series mounting plate 5. During installation, the conductors not pre-installed in the series mounting plate 5 are matched with the circuit breaker body 2, and then the series mounting plate 5 is matched with the circuit breaker body 2. Specifically, the first transition conductor 302a and shorting conductor 301 are pre-embedded in the series mounting plate 5. During installation, the second transition conductor 302b is installed first, followed by the insulating member 6, and finally the series mounting plate 5.

[0062] Example 4

[0063] As attached Figure 3a and 3b As shown, through the wiring shown in the figure, the arc current directions of all break points on the power supply side of all disconnecting poles are the same, or the arc current directions of all break points on the load side of all disconnecting poles are the same, or the arc current directions of all break points in the middle of all disconnecting poles are the same.

[0064] Example 5

[0065] As attached Figure 4a and 4b As shown, through the wiring shown in the figure, the arc current directions of all break points on the power supply side of all disconnecting poles are the same, or the arc current directions of all break points on the load side of all disconnecting poles are the same, or the arc current directions of all break points in the middle of all disconnecting poles are the same.

[0066] Example 6

[0067] As attached Figure 5 As shown in the wiring diagram, the disconnecting poles of a rotary double-break circuit breaker include both the power supply-side breakpoint and the load-side breakpoint. The arc currents at all breakpoints flow in the same direction, ensuring that arcs from all power supply-side breakpoints simultaneously enter the power supply-side arc extinguishing chamber, and arcs from all load-side breakpoints simultaneously enter the load-side arc extinguishing chamber.

[0068] Example 7

[0069] As attached Figure 6 As shown, in a bridge-type double-break circuit breaker, the disconnecting poles include breakpoints on the power supply side and breakpoints on the load side. Although the arc current direction of all breakpoints on the power supply side is opposite to that of all breakpoints on the load side, the arc current direction of all breakpoints on the power supply side is the same, and the arc current direction of all breakpoints on the load side is also the same, so that the arcs of all breakpoints on the power supply side enter the arc extinguishing chamber on the power supply side synchronously, and the arcs of all breakpoints on the load side enter the arc extinguishing chamber on the load side synchronously.

[0070] The aforementioned embodiments 4, 5, 6, and 7 are all based on the technical principles of the present invention. As the number of disconnecting poles of the circuit breaker increases, shorting conductors and transition conductors are used to change the direction of current flowing across the load, thereby improving the interrupting capacity of the DC circuit breaker. It should also be noted that there are various ways to install the series mounting plate 5, shorting conductor 301, transition conductor 302, insulating member 6, and circuit breaker body 2. Any installation method inspired by the embodiments of the present invention should be considered to fall within the scope of protection of the present invention.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-breakpoint circuit breaker, comprising a load (1) and a circuit breaker body (2), wherein the circuit breaker body (2) is connected to the load (1), and each end of the load (1) has at least one breaking pole, characterized in that: The circuit breaker body (2) is connected to a switching conductor (302) capable of converting the opposite-direction currents in at least two breaking poles (b) directly connected to both ends of the load (1) into the same-direction currents, thereby improving the breaking capacity of the multi-breakpoint circuit breaker; The circuit breaker body (2) comprises at least a first disconnecting pole (202) and a second disconnecting pole (202'), the two ends of the contact system of the first disconnecting pole (202) are respectively provided with a first connection terminal (202a) and a second connection terminal (202b), the two ends of the contact system of the second disconnecting pole (202') are respectively provided with a third connection terminal (202c) and a fourth connection terminal (202d), at least the first disconnecting pole (202) and the second disconnecting pole (202') are directly connected to the load (1), the second disconnecting pole (202') is a transfer pole (202e), and the The two ends of the contact system of the switching pole (202e) are respectively provided with a connection part 1 (202e01) located on the power supply side and a connection part 2 (202e02) located on the load side. The connection part 1 (202e01) and the connection terminal on the power supply side are electrically separated, and the connection part 2 (202e02) and the connection terminal on the load side are electrically separated. Through the switching pole (202e) and the switching conductor (302), the opposite direction currents in at least two disconnecting poles (b) directly connected to the two ends of the load (1) can be converted into the same direction currents, thereby improving the breaking capacity of the circuit breaker.

2. A multi-breakpoint circuit breaker according to claim 1, characterized in that: It also includes a corresponding number of short-circuiting conductors (301), which are capable of short-circuiting the disconnecting pole (b) directly connected to the load (1) and other disconnecting poles located on the same side of the load (1) as the disconnecting pole (b); The number of the short-circuiting conductors (301) corresponds to the number of disconnecting poles that are not directly connected to the two ends of the load (1). By means of the switching pole (202e), the switching conductor (302) and the short-circuiting conductor (301), the currents in all disconnecting poles of a circuit breaker having three or more disconnecting poles can be directed in the same direction, thereby improving the disconnecting capacity of the circuit breaker.

3. A multi-breakpoint circuit breaker according to claim 1 or 2, characterized in that: The transfer conductor (302) includes a first transfer conductor (302a) and a second transfer conductor (302b), wherein two ends of the first transfer conductor (302a) are respectively provided with a first terminal (302a01) and a second terminal (302a02), and two ends of the second transfer conductor (302b) are respectively provided with a third terminal (302b01) and a fourth terminal (302b02); One end of the first transfer conductor (302a) is connected to a fourth connection terminal (202d) located on the load side of a transfer pole (202e) directly connected to the load at one end of the load (1), and the other end is connected to a first connection portion (202e01) of the transfer pole (202e) located on the power supply side. One end of the second transfer conductor (302b) is connected to a second connection portion (202e02) of the transfer pole (202e) located on the load side, and the other end is connected to a connection terminal located on the power supply side of a disconnecting pole at the same end as the load.

4. A multi-breakpoint circuit breaker according to claim 1 or 2, characterized in that: One end of the load (1) is connected to a connection terminal of the first disconnecting pole (202) located on the load side, and the other end of the load (1) is connected to a connection terminal of the second disconnecting pole (202') located on the load side; one end of the power supply (4) is connected to a connection terminal on the power supply side of one of the disconnecting poles of the first disconnecting pole (202) located on the same end as the load, and the other end of the power supply (4) is connected to a connection terminal on the power supply side of one of the disconnecting poles of the switching pole (202e) located on the same end as the load.

5. The multi-breakpoint circuit breaker according to claim 3, characterized in that: The other end of the second transfer conductor (302b) is connected to the third connection terminal (202c) of the transfer pole (202e) located on the power supply side.

6. A multi-breakpoint circuit breaker according to claim 4, characterized in that: One end of the load (1) is connected to the second terminal (202b) of the disconnecting pole (202) on the load side, and the other end of the load (1) is connected to the fourth terminal (202d) of the disconnecting pole (202') on the load side; one end of the power supply (4) is connected to the first terminal (202a) on the power side of the disconnecting pole (202), and the other end of the power supply (4) is connected to the third terminal (202c) of the switching pole (202e) on the power side.

7. The multi-breakpoint circuit breaker according to claim 2, characterized in that: One end of each of the corresponding number of short-circuit conductors (301) is connected to a connection terminal on the load side of a disconnecting pole, and the other end is connected to a connection terminal on the power supply side of another disconnecting pole located at the same end of the load.

8. The multi-breakpoint circuit breaker according to claim 1, characterized in that: At least the connection terminals at both ends of the first disconnecting pole (202) and the second disconnecting pole (202') are located outside the cavity of the circuit breaker body (2).

9. The multi-breakpoint circuit breaker according to claim 1, characterized in that: The two ends of the load (1) are located on one side of the circuit breaker body (2), and the two ends of the power supply (4) are located on the other side of the circuit breaker body (2).

10. A multi-breakpoint circuit breaker according to claim 1 or 2, characterized in that: It also includes a series mounting plate (5), which is mounted on the bottom of the circuit breaker body (2), and a corresponding number of short-circuit conductors (301) and transfer conductors (302) are located in the space formed by the series mounting plate (5) and the bottom of the circuit breaker body (2).

11. The multi-breakpoint circuit breaker according to claim 3, characterized in that: An insulating member (6) is provided between the first switching conductor (302a) and the second switching conductor (302b) to insulate the two.

12. The multi-breakpoint circuit breaker according to claim 10, characterized in that: A corresponding number of short-circuit conductors (301) and transfer conductors (302) are pre-installed in the series installation plate (5).

13. The multi-breakpoint circuit breaker according to claim 10, characterized in that: A corresponding number of short-circuit conductors (301) and transition conductors (302) are not pre-installed in the series mounting plate (5); during installation, after the corresponding number of short-circuit conductors (301) and transition conductors (302) are matched and installed with the circuit breaker body (2), the series mounting plate (5) is matched and installed with the circuit breaker body (2).

14. The multi-breakpoint circuit breaker according to claim 10, characterized in that: A portion of the corresponding number of short-circuit conductors (301) and transfer conductors (302) are not pre-installed in the series mounting plate (5), while the remaining portion is pre-installed in the series mounting plate (5). During installation, the conductors not pre-installed in the series mounting plate (5) are matched with the circuit breaker body (2) before the series mounting plate (5) is matched with the circuit breaker body (2).

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