Double-breakpoint circuit breaker for direct current system

Abstract

A double-breakpoint circuit breaker for a direct current system is characterized in that the double-breakpoint circuit breaker comprises an operating handle (1), the operating handle (1) is linked with a rotating shaft (3) through an upper connecting rod (2), a jump pin (6) and a lock catch (7), the rotating shaft (3) is connected with a double-breakpoint moving contact system (a) through a lower connecting rod (4), and the rotating shaft (3) can be driven to rotate through the upper connecting rod (2), the jump pin (6) and the lock catch (7) in the rotating process of the operating handle (1). And the rotating shaft (3) can drive the double-breakpoint moving contact system (a) to move up and down through the lower connecting rod (4) in the rotating process, so that the double-breakpoint moving contact system (a) and the corresponding double-breakpoint static contact system (b) are contacted and separated to realize the on-off of the circuit breaker. According to the circuit breaker, the rotation of the handle is converted into the up-and-down movement of the moving contact system through the improvement of the rotating shaft structure and the installation position, the purpose of double breakpoints is achieved, and the up-and-down movement of the double-breakpoint moving contact system is not required to be linear movement. The moving contact keeps a trend of rotating towards two sides under the action of the pressure spring so as to realize close contact with the static contact assembly, the installation difficulty of a product is simplified, the reliability and the stability of motion transmission are improved, meanwhile, due to the layout of the whole circuit breaker, more arc extinguishing grid sheets can be arranged in the circuit breaker, and the breaking capacity of the circuit breaker is improved.

Description

Technical Field

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

[0002] The word "switch" means "on" and "off." It refers to a component that can open a circuit, interrupt current flow, or redirect it to another circuit. The most common switch is a human-operated electromechanical device with one or more contacts. A "closed" contact indicates that the contact is conducting, allowing current to flow; an "open" switch indicates that the contact is disconnected, preventing current from flowing. The history of switches has evolved from the original manual knife switch to the intelligent switches currently used in various large-scale electrical control equipment. Switches have become increasingly versatile and offer increasing safety.

[0003] With the development of DC power systems such as photovoltaics, energy storage, rail transit, and data centers, the application of switches in DC systems has become increasingly widespread. In the existing technology, circuit breakers originally used for AC systems cannot be used in DC systems, or can be used in DC systems after being modified. However, the existing circuit breakers for DC systems cannot meet the requirements of fast disconnection of existing DC power systems. Even if there are some double-breakpoint circuit breakers that can be used in DC systems, they adopt a rotary structure, that is, two different moving contacts are installed on the same rotating shaft. The rotation of the rotating shaft drives the moving contact to contact the static contact assembly during the rotation process, thereby achieving the purpose of double breakpoints. This type of rotary double-breakpoint circuit breaker is large in size, making it difficult to arrange more arc extinguishing grids, resulting in limited arc extinguishing ability and weak breaking ability of the circuit breaker.

[0004] Chinese Patent 202111275819.5 discloses a double-break contact electric switch, which belongs to the field of electric switch technology, including a shell, wherein an operating mechanism and a double-break contact mechanism are arranged in the shell; at least one row of arc extinguishing chambers are respectively provided on both sides of the double-break contact mechanism; the operating mechanism includes an operating handle and a driving member connected to the operating handle, the driving member is connected to the moving contact frame of the double-break contact mechanism through a connecting rod, and a jump structure is connected to the driving member, and the jump structure has an elastic force that causes the driving member to move quickly when the driving member moves from the closing position to the opening position or from the opening position to the closing position; the double-break contact electric switch, through the cooperation of the operating mechanism and the double arc extinguishing chambers, enables the DC high voltage to be quickly cut off, and at the same time, the arc is quickly cut and extinguished through the double grid plates, thereby improving the arc extinguishing performance and service life of the electric switch. However, the motion transmission structure of the switch is complex, especially the transmission structure that converts the rotation of the handle into the up and down movement of the moving contact is too complicated, resulting in the inability to effectively arrange more arc-extinguishing grids to improve the arc-extinguishing ability. It also has strict requirements on motion transmission and is difficult to process and assemble. Summary of the Invention

[0005] The present invention aims to address the drawbacks of the aforementioned circuit breakers used in DC power systems, such as their complex motion transmission structure, difficult assembly, poor reliability, large product size, and poor breaking performance. By providing a dual-breakpoint circuit breaker for DC systems, the present invention improves the structure and mounting position of the rotating shaft, converting the rotation of the handle into up-and-down movement of the moving contact system, thereby achieving dual breakpoints. This simplifies product installation and improves the reliability and stability of motion transmission. Furthermore, the overall layout of the circuit breaker allows for the installation of more arc-extinguishing grids, thereby enhancing the breaking capacity of the circuit breaker.

[0006] Technical Solution

[0007] In order to achieve the above technical objectives, the present invention provides a double-breakpoint circuit breaker for a DC system, characterized in that: it includes an operating handle, the operating handle is linked to the rotating shaft through an upper connecting rod, a trip buckle and a lock buckle, the rotating shaft is connected to the double-breakpoint moving contact system through a lower connecting rod, and during the rotation of the operating handle, the rotating shaft can be driven to rotate by the upper connecting rod, the trip buckle and the lock buckle, and during the rotation of the rotating shaft, the double-breakpoint moving contact system can be driven up and down by the lower connecting rod, so that the double-breakpoint moving contact system and the corresponding double-breakpoint static contact system are in contact and separation, thereby realizing the on and off of the circuit breaker.

[0008] In one embodiment, the operating handle is arranged above the inner cavity of the shell, and the operating end of the operating handle extends out of the shell, the rotating shaft is arranged at the right side below the operating handle, the double-breakpoint moving contact system is arranged at the position directly below the operating handle and can move in the shell space on the left side of the rotating shaft, the jumper and the lock are arranged on the rotating shaft, and the arc striking structure group and the arc extinguishing chamber group are arranged in sequence in the shell space below the rotating shaft on both sides of the double-breakpoint moving contact system, the double-breakpoint static contact system corresponds to the double-breakpoint moving contact system, and a magnetic tripping system is installed on the outside of the right arc extinguishing chamber in the arc extinguishing chamber group on one side of the shell where the rotating shaft is installed, and a thermal tripping system is installed on the outside of the left arc extinguishing chamber in the arc extinguishing chamber group on the side of the shell away from the installation of the rotating shaft, and the bimetallic strip in the thermal tripping system extends to the bottom position above the double-breakpoint moving contact system and is linked to the tripping rod extending from the lock.

[0009] Furthermore, a right wiring terminal is installed in the shell outside the magnetic tripping system.

[0010] In one embodiment, the jump buckle and the lock buckle are arranged on the rotating shaft.

[0011] In one embodiment, the operating handle drives the jump buckle to rotate via an upper connecting rod, and the jump buckle can be linked with the lock buckle to lock the operating mechanism during the rotation process.

[0012] Furthermore, the lock buckle can release the lock of the trip buckle under the action of a thermal trip system or a magnetic trip system.

[0013] Furthermore, the rotating shaft is rotatably installed in the inner cavity of the shell, the jump buckle is rotatably installed on the rotating shaft, the lock buckle is rotatably installed on the rotating shaft, and the reset torsion spring is installed on the lock buckle, with one end resting against the raised platform on the rotating shaft and the other end resting against the raised platform on the lock buckle. One end of the upper connecting rod is pivotally connected to the operating handle, and the other end is pivotally connected to the driving hole on the jump buckle. A linkage arm extends from the lock buckle, and a linkage step corresponding to the linkage arm is provided on the jump buckle.

[0014] Furthermore, a cantilever extends from the rotating shaft, one end of the lower connecting rod is mounted on the end of the cantilever, and the other end is mounted on the contact seat of the double-breakpoint moving contact system.

[0015] Furthermore, the rotating shaft is connected to a reaction spring for accelerating the opening speed.

[0016] In one embodiment, the double-breakpoint moving contact system includes a contact base, and the left moving contact and the right moving contact are rotatably mounted on both sides of the contact base. The outer surfaces of the contact parts of the left moving contact and the right moving contact are equipped with insulating parts, and the two ends of the pressure spring respectively press against the inner sides of the corresponding insulating parts. The left moving contact and the right moving contact are connected by a soft connection.

[0017] Furthermore, the protruding contact portions provided on the left moving contact and the right moving contact are exposed from the insulating member and correspond to the double-breakpoint static contact system.

[0018] Furthermore, the contact seat can slide up and down on the housing through a sliding groove structure.

[0019] Furthermore, the contact base is connected to a trip acceleration spring.

[0020] Furthermore, the mounting portions of the left moving contact and the right moving contact are rotatably mounted in the moving contact mounting grooves on both sides of the inner cavity of the contact base via contact shafts.

[0021] In one embodiment, the magnetic tripping system includes a coil bracket, a coil is mounted on the coil bracket, a moving iron core is mounted in the inner cavity of the coil bracket, a push rod is mounted on the upper end of the moving iron core, and the lower end of the moving iron core located on the outside of the coil bracket is connected to a magnetic yoke, the coil is connected to the right terminal, and a tripping part is mounted on the push rod, and the tripping part is linked with the lock to unlock the lock.

[0022] Furthermore, one end of the magnetic yoke is mounted on the lower end of the moving iron core located outside the coil bracket, and the other end extends to the outside of the coil.

[0023] Furthermore, one end of the release member is fixed to the push rod, and the other end extends to one side of the lock to interact with the lock.

[0024] Furthermore, the release part includes a frame-shaped push rod linkage part and a lock unlocking push part, the frame-shaped push rod linkage part is placed on the push rod, one side of the frame-shaped push rod linkage part is bent toward the lock direction to form a lock unlocking push part for linkage with the lock, and a support part is provided on one side of the frame-shaped push rod linkage part.

[0025] In one embodiment, the thermal trip system includes a left terminal, one end of the connector is connected to the left terminal, and the other end is connected to one end of a bimetallic strip, and the other end of the bimetallic strip corresponds to a trip rod extending from the lock.

[0026] Furthermore, the tripping rod extends from the lock catch and then from the rear end of the cantilever on the rotating shaft to a position corresponding to the other end of the bimetallic strip.

[0027] Furthermore, the position of the connecting piece is adjustable.

[0028] Furthermore, the left wiring terminal includes a left wiring frame, which is installed in the left wiring terminal installation slot in the shell, the left wiring screw is installed on the left wiring frame, one end of the left wiring board is connected to the left wiring frame, and the other end is connected to the connector.

[0029] In one embodiment, the arc-striking structure group includes an upper magnetic conductive sheet arranged on the back of the arc-striking part of the static contact assembly in the double-breakpoint static contact system, and a front ceramic sheet and a rear ceramic sheet are respectively arranged on the front and rear sides of the arc-striking part. The outer sides of the front ceramic sheet and the rear ceramic sheet are respectively provided with a front magnetic conductive sheet and a rear magnetic conductive sheet. The front ceramic sheet, the rear ceramic sheet, the arc-striking part, the upper magnetic conductive sheet and the front magnetic conductive sheet and the rear magnetic conductive sheet constitute an arc-striking channel, and the arc outlet of the arc-striking channel corresponds to the arc inlet of the arc extinguishing chamber group, and the arc inlet of the arc-striking channel corresponds to the contact part of the double-breakpoint moving contact system and the double-breakpoint static contact system.

[0030] Furthermore, the static contact assembly includes an arc-striking portion, the tail of the arc-striking portion is connected to a downwardly bent static arc-striking plate, the front of the arc-striking portion extends a contact portion that is bent upward, and the contact portion is equipped with a static silver point.

[0031] Furthermore, the static arc-striking plate extends to the top ends of the corresponding arc-extinguishing grids of the left arc-extinguishing chamber and the right arc-extinguishing chamber.

[0032] Furthermore, a moving arc-striking plate is arranged on one side end of the left arc-extinguishing chamber and the right arc-extinguishing chamber corresponding to the left moving contact and the right moving contact respectively.

[0033] In one embodiment, the left arc extinguishing chamber and / or the right arc extinguishing chamber in the arc extinguishing chamber group are arranged horizontally or obliquely on both sides of the double-breakpoint moving contact system to independently extinguish the arc generated when the corresponding left moving contact and right moving contact in the double-breakpoint moving contact system a are disconnected.

[0034] Furthermore, the arc inlets of the left arc extinguishing chamber and the right arc extinguishing chamber respectively correspond to the arc outlets of the corresponding arc striking channels, and the arc outlets of the left arc extinguishing chamber and the right arc extinguishing chamber correspond to the corresponding exhaust ports on the shell.

[0035] Beneficial effects

[0036] The present invention provides a double-breakpoint circuit breaker for a DC system, which includes an operating handle, wherein the operating handle is connected to a rotating shaft via an upper connecting rod, a tripping buckle and a locking buckle, and the rotating shaft is connected to a double-breakpoint moving contact system via a lower connecting rod. During rotation of the operating handle, the rotating shaft can be driven to rotate via the upper connecting rod, the tripping buckle and the locking buckle, and during rotation of the rotating shaft, the double-breakpoint moving contact system can be driven to move up and down via the lower connecting rod, thereby causing the double-breakpoint moving contact system and the corresponding double-breakpoint static contact system to contact and separate, thereby realizing the on and off of the circuit breaker. By improving the shaft structure and installation position, the circuit breaker converts the rotation of the handle into the up and down movement of the moving contact system, thereby achieving the purpose of double breakpoints. The up and down movement of the double-breakpoint moving contact system does not require linear motion. The moving contact relies on the action of the pressure spring to maintain the tendency to rotate to both sides, which can achieve close and reliable contact with the static contact assembly, simplifying the installation difficulty of the product and improving the reliability and stability of motion transmission. At the same time, the layout of the entire circuit breaker enables more arc-extinguishing grids to be arranged in the circuit breaker. The double-breakpoint structural design increases the total opening distance of the circuit contacts and improves the breaking capacity of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0038] Attachment Figure 1a This is the product front view of the circuit breaker in Example 1 of the present invention.

[0039] Attachment Figure 1b This is a top view of the circuit breaker in Example 1 of the present invention.

[0040] Attachment Figure 2 It is a structural schematic diagram of the circuit breaker in the open state in embodiment 1 of the present invention.

[0041] Attachment Figure 3 It is a structural schematic diagram of the circuit breaker in the closed state in embodiment 1 of the present invention.

[0042] Attachment Figure 4 This is a schematic diagram of the rotating shaft product in Example 1 of the present invention.

[0043] Attachment Figure 5 This is the first schematic diagram of the lock product in Example 1 of the present invention.

[0044] Attachment Figure 6 This is a schematic diagram of the lock product in Example 1 of the present invention Figure 2 .

[0045] Attachment Figure 7 This is the front view of the lock in Example 1 of the present invention.

[0046] Attachment Figure 8 This is a front view of the double-breakpoint moving contact system in Example 1 of the present invention.

[0047] Attachment Figure 9 It is a schematic diagram of the decomposition of the double-breakpoint moving contact system in Example 1 of the present invention.

[0048] Attachment Figure 10 It is a schematic diagram of the internal installation structure of the double-breakpoint moving contact system in Example 1 of the present invention.

[0049] Attachment Figure 11 It is a schematic diagram of the exploded connection relationship between the left moving contact and the right moving contact of the double-breakpoint moving contact system in Example 1 of the present invention.

[0050] Attachment Figure 12 It is an axonometric diagram of the positional relationship between the double-breakpoint moving contact system and the double-breakpoint static contact system in Example 1 of the present invention.

[0051] Attachment Figure 13 Schematic diagram of the positional relationship between the double-breakpoint moving contact system and the double-breakpoint static contact system in Example 1 of the present invention.

[0052] Attachment Figure 14 This is a schematic diagram of the installation of the thermal trip system in Example 1 of the present invention.

[0053] Attachment Figure 15 Schematic diagram of the thermal tripping system structure in Example 1 of the present invention.

[0054] Attachment Figure 16a This is a schematic diagram of the installation of the magnetic tripping system in Example 1 of the present invention.

[0055] Attachment Figure 16b Schematic diagram of the internal structure of the magnetic tripping system in Example 1 of the present invention.

[0056] Attachment Figure 17 This is a schematic diagram of the magnetic tripping system when the circuit breaker is in the open state in Example 1 of the present invention.

[0057] Attachment Figure 18 This is a schematic diagram of the installation of the arc extinguishing chamber group in Example 1 of the present invention.

[0058] Attachment Figure 19 It is a schematic diagram of the positional relationship among the double-breakpoint moving contact system, arc striking structure group and arc extinguishing chamber group in Example 1 of the present invention.

[0059] Attachment Figure 20 This is the first schematic diagram of the decomposition of the arc striking structure assembly in Example 1 of the present invention.

[0060] Attachment Figure 21 This is a schematic diagram of the arc striking structure assembly in Example 1 of the present invention. Figure 2 .

[0061] Attachment Figure 22 This is a schematic diagram of the installation of the arc extinguishing chamber group in Example 2 of the present invention. DETAILED DESCRIPTION

[0062] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0063] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0064] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0065] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. When a first feature is "below," "below," or "below" a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is lower in level than the second feature.

[0066] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more of the relevant listed items.

[0067] Example 1

[0068] In the prior art, circuit breakers used in DC power systems generally do not have a dual breakpoint function. Even now, some circuit breakers with a dual breakpoint function for DC power systems have emerged. The more common dual breakpoint circuit breakers have changed the moving contact system of the double breakpoint circuit breaker from traditional rotation to linear motion due to considerations of the installation space of the circuit breaker and the arc extinguishing space required by the double breakpoint circuit breaker. However, in the prior art solution, the rotation of the operating mechanism handle is converted into the linear motion of the dual breakpoint moving contact system. The motion transmission structure is complex, the assembly precision requirements are high, the reliability is poor, the transmission is prone to jamming, the arc extinguishing effect is limited, and the breaking performance is poor.

[0069] In order to solve the above problems, the attached Figure 1a , 1b, 2 and 3, this embodiment provides a double-breakpoint circuit breaker for a DC system, which includes an operating handle 1, and the operating handle 1 is linked to the rotating shaft 3 through an upper connecting rod 2, a tripping buckle 6 and a lock buckle 7. The rotating shaft 3 is connected to the double-breakpoint moving contact system a through a lower connecting rod 4. During the rotation of the operating handle 1, the rotating shaft 3 can be driven to rotate through the upper connecting rod 2, the tripping buckle 6 and the lock buckle 7. During the rotation of the rotating shaft 3, the double-breakpoint moving contact system a can be driven to move up and down through the lower connecting rod 4, so that the double-breakpoint moving contact system a and the corresponding double-breakpoint static contact system b are in contact and separation, thereby realizing the on and off of the circuit breaker. This embodiment utilizes the structure of a cantilever 302 extending from the rotating shaft 3. When the rotating shaft rotates, the cantilever drives the double-moving point moving contact system a to move. The up and down movement of the double-break point moving contact system a is not a completely linear movement, and there is also left and right movement (generally speaking, the left and right movement amplitude of the double-break point moving contact system a is small), that is, the double-break point moving contact system a can also achieve contact with the double-break point static contact system b by slightly deflecting it to the left or right, which effectively reduces the difficulty of assembly and improves the reliability of motion transmission.

[0070] In this embodiment, the circuit breaker, especially the functional components of the circuit breaker, are further rearranged. Specifically, as shown in the attached figure, Figure 2 and 3As shown, the operating handle 1 is arranged above the inner cavity of the shell 5, and the operating end of the operating handle 1 extends out of the shell 1, the rotating shaft 3 is arranged at the right side below the operating handle 1, and the double-breakpoint moving contact system a is arranged at a position directly below the operating handle 1 and can move in the shell 5 space on the left side of the rotating shaft 3. In this embodiment, the double-breakpoint moving contact system a is arranged at a position directly below the operating handle 1. It does not require that the centers of the double-breakpoint moving contact system a and the operating handle 1 must be aligned. Generally speaking, as long as it is in the vertical direction up and down, it is considered to be directly below. The jump buckle 6 and the lock buckle 7 are arranged on the rotating shaft 3. The two sides of the double-breakpoint moving contact system a are located in the shell 5 space below the rotating shaft 3, and the arc striking structure group 8 and the arc extinguishing chamber group 9 are arranged in sequence up and down, as shown in the attached figure. Figure 12 and 13 As shown, the double-break static contact system b corresponds to the double-break moving contact system a. A magnetic trip system 10 is installed on the side of the housing 5 where the rotating shaft 3 is installed, located outside the right arc extinguishing chamber 901 of the arc extinguishing chamber group 9. A thermal trip system 11 is installed on the side of the housing 5 away from the rotating shaft 3, located outside the left arc extinguishing chamber 902 of the arc extinguishing chamber group 9. The bimetallic strip 1103 in the thermal trip system 11 extends from the top of the corresponding side of the double-break static contact system b to the bottom position above the double-break moving contact system a and is linked to the trip rod 701 extending from the lock 7. A clearance gap is provided on the corresponding side of the double-break static contact system b to avoid the bimetallic strip 1103. The bimetallic strip 1103 is connected to the static contact assemblies b01 and b01' of the double-break static contact system b via a flexible connector to form a circuit.

[0071] A right terminal 1006 is mounted within the housing 5, outside the magnetic trip system 10. With this layout, the housing 5's convex shape minimizes the circuit breaker's size. This dual-break circuit breaker achieves the goal of increasing the number of arc-extinguishing grids. The structure and operating principles of each functional component will be further detailed below, with reference to the accompanying drawings.

[0072] As attached Figure 2 and 3As shown, in the operating mechanism of the circuit breaker, the operating handle 1 drives the trip button 6 to rotate through the upper connecting rod 2. During the rotation of the trip button 6, it can work together with the lock button 7 to lock the operating mechanism. The lock button 7 can release the lock of the trip button 6 under the action of the thermal trip system 11. Similarly, the lock button 7 can also release the lock of the trip button 6 under the action of the magnetic trip system 10. Furthermore, the rotating shaft 3 is rotatably mounted in the inner cavity of the shell 5, the trip button 6 is rotatably mounted on the rotating shaft 3, and the lock button 7 is rotatably mounted on the rotating shaft 3. The reset torsion spring 12 is mounted on the lock button 7, one end of which is against the raised platform 301 on the rotating shaft 3, and the other end is against the raised platform 301 on the lock button 7. One end of the upper connecting rod 2 is pivotally connected to the operating handle 1, and the other end is pivotally connected to the driving hole 601 on the trip button 6, as shown in the attached figure. Figure 5 , 6 and 7, a linkage arm 703 extends from the lock buckle 7, and a linkage step 602 corresponding to the linkage arm 703 is provided on the jump buckle 6. In this embodiment, specifically, the rotating shaft 3 is rotatably mounted on the rotating shaft mounting shaft 504 on the housing 5, the jump buckle 6 is rotatably mounted on the jump buckle mounting shaft 303 on the rotating shaft 3, and the lock buckle 7 is rotatably mounted on the lock buckle mounting shaft 304 on the rotating shaft 3. As shown in the attached Figure 4 As shown, a cantilever 302 extends from the rotating shaft 3. One end of the lower connecting rod 4 is mounted on the end of the cantilever 302, and the other end is mounted on the contact base a1 of the dual-breakpoint moving contact system a. It should be noted that to ensure that the dual-breakpoint moving contact has a small amplitude of left-right movement, the rotation center o1 of the rotating shaft 3, which is rotatably mounted within the inner cavity of the housing 5, should be as far away as possible from the connection point o2 between the end of the lower connecting rod 4 and the end of the cantilever 302. In this way, the rotation of the rotating shaft, through the conversion of the cantilever 302, ensures that the dual-breakpoint moving contact system a moves as much as possible in the vertical direction, while the amplitude of left-right movement is small. In addition, one end of the upper connecting rod 2 is pivotally connected to the operating handle 1, and the other end is pivotally connected to the driving hole 601 on the trip buckle 6. The rotating shaft 3 is rotatably installed in the inner cavity of the shell 5, and the trip buckle 6 is rotatably installed on the trip buckle mounting shaft 303 on the rotating shaft 3. The upper connecting rod 2, the trip buckle 6, the lock buckle 7 and the rotating shaft 3 form a connecting rod mechanism. The rotation of the operating handle 1 can drive the rotating shaft 3 to rotate through the upper connecting rod 2, the trip buckle 6 and the lock buckle 7, thereby driving the movement of the double-breakpoint moving contact system a.

[0073] As attached Figure 2 and 3As shown, when an overcurrent occurs in the circuit, to open the operating handle 1, a reaction spring 13 is connected to the rotating shaft 3. One end of the reaction spring 13 abuts the inner cavity of the housing 5, and the other end abuts the rotating shaft 3. That is, when the operating handle 1 is closed, the reaction spring 13 is compressed to store energy. When an overcurrent occurs in the circuit and the operating handle 1 is about to change from the closed state to the open state, the reaction spring 13 is released, accelerating the rotation of the rotating shaft 3 to facilitate opening.

[0074] As attached Figure 8 , 9, 10 and 11, in this embodiment, the double-breakpoint moving contact system a includes a contact base a1, and the left moving contact a2 and the right moving contact a3 are rotatably mounted on both sides of the contact base a1, and the left moving contact a2 and the right moving contact a3 are connected by a soft connection a8. In this embodiment, the mounting portions of the left moving contact a2 and the right moving contact a3 are rotatably mounted in the moving contact mounting grooves a101, a101' on both sides of the inner cavity of the contact base a1 through contact shafts a7, a7'. As shown in the attached Figure 10 and 11As shown, to prevent arc damage to contact base a1 caused by the circuit breaker tripping, the outer surfaces of the contact portions of the left and right moving contacts a2 and a3 are equipped with insulating members a5 and a5'. The two ends of a pressure spring a4 rest against the inner sides of the corresponding insulating members a5 and a5', respectively. The pressure spring a4 is installed in a pressure spring mounting slot a102 on the contact base a1. The two ends of the pressure spring a4 are placed in pressure spring slots a501 and a501' inside the corresponding insulating members a5 and a5', resting against the bottoms of these slots a501 and a501'. The upper ends of the insulating members a5 and a5' are provided with protruding corners a502 and a502' to increase creepage distance. Furthermore, the protruding contact portions a201 and a301 on the left and right moving contacts a2 and a3 expose the insulating members a5 and a5', corresponding to the double-breakpoint static contact system b. The left moving contact a2 and the right moving contact a3 are limited in their rotational travel by the moving contact mounting slots a101 and a101'. With this structure, during the up-and-down movement of the contact base a1, the contact base a1 is driven by the cantilever 302 of the rotating shaft 3. During the rotation of the rotating shaft 3, the cantilever 302 drives the contact base a1 up and down. Since the contact base does not move in a straight line up and down, the left moving contact a2 and the right moving contact a3 always have a tendency to rotate outward under the action of the pressure spring a4. As the left moving contact a2 and the right moving contact a3 move upward with the contact base, the protruding contact portions a201 and a301 provided on the left moving contact a2 and the right moving contact a3 will respectively contact the contact portions b01b and b01b' of the double-breakpoint static contact system b. The static silver points b01c, b01c' are in contact, and slightly rotate inward under the action of the corresponding static silver points b01c, b01c' of the contact parts b01b, b01b', thereby achieving close contact between the protruding contact parts a201, a301 and the corresponding static silver points b01c, b01c' of the contact parts b01b, b01b'. At the same time, the rotating installation of the left moving contact a2 and the right moving contact a3 and the coordination of the up and down non-linear movement of the contact seat make it unnecessary for the left moving contact a2 and the right moving contact a3 to be installed symmetrically in the middle, thereby reducing the difficulty of assembling the double-breakpoint moving contact system a, improving the reliability of motion transmission, and making it less likely to get stuck.

[0075] In this embodiment, for smooth and convenient movement, the contact base a1 can slide up and down on the housing 5 via the slide groove 501 structure. Generally speaking, if the slide groove 501 structure is installed on the housing 5, the slide rail needs to be installed on the contact base a1. Conversely, if the slide groove 501 structure is installed on the contact base a, the slide rail needs to be installed on the housing 5.

[0076] In this embodiment, as shown in the attached Figure 2As shown, in order to guide and limit the movement process of the left moving contact a2 and the right moving contact a3, guide and limit shafts 505, 505' are provided at corresponding positions on the shell 5 outside the left moving contact a2 and the right moving contact a3. The guide and limit shafts 505, 505' can provide inward rotation pressure to the left moving contact a2 and the right moving contact a3 during the movement process.

[0077] The contact seat a1 includes a contact base a103 and a contact upper cover a104, and the contact base a103 and the contact upper cover a104 are locked together. The contact seat a1 is connected to a tripping acceleration spring a6. When the tripping acceleration spring a6 is placed above the contact seat a1, the tripping acceleration spring a6 is a tower spring or a compression spring. When the tripping acceleration spring a6 is placed at the bottom of the contact seat a1, the tripping acceleration spring a6 is a tension spring. In this embodiment, the tripping acceleration spring a6 is arranged in a spring mounting groove 503 on the housing 5 between the left arc extinguishing chamber 902 and the right arc extinguishing chamber 901 on both sides of the double-break moving contact system a. One end is connected to the contact seat a1, and the other end is fixed to the bottom of the spring mounting groove 503 on the housing 5. The left arc extinguishing chamber 902 and the right arc extinguishing chamber 901 are separated by the spring mounting groove 503 on the housing 5. The opening acceleration spring a6 provides a downward force to the contact base a1, causing it to tend to move downward.

[0078] As attached Figure 16a , as shown in 16b and 17, in this embodiment, the magnetic tripping system 10 includes a coil bracket 1001, a coil 1002 is sleeved on the coil bracket 1001, a moving iron core 1003 is installed in the inner cavity of the coil bracket 1001, a push rod 1004 is installed at the upper end of the moving iron core 1003, and the lower end of the moving iron core 1003 located on the outer side of the coil bracket 1001 is connected with a yoke 1005, the coil 1002 is connected to the right wiring terminal 1006, and the right wiring terminal 1006 is installed in the right terminal mounting groove 506 on the right side of the shell 5, and a tripping member 1007 is installed on the push rod 1004, and the tripping member 1007 is connected to the outer side of the shell 5 as shown in the attached figure. Figure 5 ,6,7 shown in the lock 7 linkage can unlock the lock 7. Specifically, one end of the yoke 1005 is mounted on the lower end of the moving iron core 1003 located outside the coil bracket 1001, and the other end extends to the outside of the coil 1002. One end of the release member 1007 is fixed to the push rod 1004, and the other end extends to the outer side of the coil 1002. Figure 6 One side of the lock buckle 7 is linked to the release step 705 on the lock buckle 7. Figure 16bAs shown, one end of the moving iron core 1003 located within the inner cavity of the coil support 1001 is fixedly connected to a moving iron core stopper 1008. A static iron core 1009 is placed within the inner cavity of the coil support 1001, corresponding to the moving iron core 1003. One end of the moving iron core stopper 108 is fixedly connected to the moving iron core 1003, and the other end passes through the static iron core 1009 and extends out of the coil support 1001. A core spring 1010 is mounted on the moving iron core stopper 1008, with one end abutting against the moving iron core 1003 and the other end abutting against the static iron core 1009. A limit platform 1008a is provided on the end of the moving iron core stopper 1008 extending from the coil support 1001 to limit the movement of the moving iron core stopper 1008. In this embodiment, the release member 1007 is an elastic release member. The release member 1007 includes a frame-shaped push rod linkage portion 1007a and a lock unlocking push portion 1007b. The frame-shaped push rod linkage portion 1007a is provided with a push rod linkage slot (not shown in the drawings). The push rod 1004 is located in the push rod linkage slot and can drive the release member 1007 to move through the push rod linkage slot. One side of the frame-shaped push rod linkage portion 1007a is bent toward the lock 7 to form a lock unlocking push portion 1007b for linkage with the lock 7. A support portion 1007c is provided on one side of the frame-shaped push rod linkage portion 1007a. The release member 1007 is installed on the shaft 1007c01 on the housing 5 through the shaft hole (not shown in the drawings) on the support portion 1007c and can rotate around the shaft 1007c01. As shown in the attached figure Figure 18 As shown, in the energized state, the coil induces a magnetic field, and the moving iron core 1003 moves downward under the action of the magnetic field, driving the push rod 1004 to move downward, thereby driving the tripping member 1007 to release the lock 7, causing the circuit breaker to trip and open. Figure 2 and 17 shown.

[0079] As attached Figure 14 and 15 As shown, the thermal trip system 11 in this embodiment includes a left terminal 1101, one end of a connector 1102 is connected to the left terminal 1101, and the other end is connected to one end of a bimetallic strip 1103, and the other end of the bimetallic strip 1103 corresponds to a trip rod 701 extending from the lock 7. The trip rod 701 is installed as shown in the attached Figure 6The trip rod shaft 704 on the lock catch 7 is shown as follows. The trip rod 701 extends from the lock catch 7 and then extends from the rear end of the cantilever 302 on the rotating shaft 3 to a position corresponding to the other end of the bimetallic strip 1103. The position of the connecting member 1102 is adjustable. The adjustment screw 1104 is mounted on the upper surface of the housing 5 and corresponds to the connecting member 1102 to adjust the position of the connecting member 1102 and thus adjust the position of the bimetallic strip 1103. The left wiring terminal 1101 includes a left wiring frame 1101a, which is mounted in the left wiring terminal mounting slot 505 in the housing 5. The left wiring screw 1101b is mounted on the left wiring frame 1101a. One end of the left wiring board 1101c is connected to the left wiring frame 1101a, and the other end is connected to the connecting member 1102. The thermal trip system 11 is placed on a side of the circuit breaker housing away from the operating mechanism, which effectively utilizes the space inside the housing, reduces the volume of the circuit breaker, and is conducive to arranging the corresponding arc extinguishing chamber of the double-break moving contact system.

[0080] In a circuit breaker with a double breakpoint function, the arc extinguishing capability is required to be high, and the breaking arc needs to be quickly introduced into the arc extinguishing chamber for extinguishing. Therefore, in this embodiment, if Figure 19 As shown in the figure, an arc striking structure group 8 is provided at the entrance of the arc extinguishing chamber. Figure 20 and 21 As shown, the arc-striking structure group 8 includes upper magnetic conductive sheets 801, 801' on the back of the arc-striking parts b01a, b01a' of the static contact assemblies b01, b01' in the double-breakpoint static contact system b, and the front and rear sides of the arc-striking parts b01a, b01a' are respectively provided with front ceramic sheets and rear ceramic sheets, and the outer sides of the front ceramic sheets 806, 806' and the rear ceramic sheets 807, 807' are respectively provided with front magnetic conductive sheets 802, 802' and rear magnetic conductive sheets 803, 803', and the front ceramic sheets 806 , 806', rear ceramic sheets 807, 807', arc-striking portions b01a, b01a', upper magnetic conductive sheets 801, 801', front magnetic conductive sheets 802, 802', and rear magnetic conductive sheets 803, 803' form arc-striking channels 805, 805'. The arc outlets of these arc-striking channels 805, 805' correspond to the arc inlets 901a, 902a of the arc-extinguishing chamber group 9, and the arc inlets of these arc-striking channels 805, 805' correspond to the contact points of the double-breakpoint moving contact system a and the double-breakpoint static contact system b. In this structure, the front magnetic conductive sheets 802, 802' and rear magnetic conductive sheets 803, 803' can further quickly guide the breaking arc along the arc-striking channels 805, 805' into the corresponding left and right arc-extinguishing chambers 902 and 901 under the action of the magnetic field.

[0081] Further, as attached Figure 20 and 21As shown, in this embodiment, the static contact assemblies b01, b01' include arc-striking portions b01a, b01a', the tails of which are connected to downwardly curved static arc-striking plates 804, 804'. Extending from the front of the arc-striking portions b01a, b01a' are upwardly curved contact portions b01b, b01b', each of which is equipped with static silver contacts b01c, b01c'. The static arc-striking plates 804, 804' extend to the top ends of the corresponding arc-extinguishing grids in the left and right arc-extinguishing chambers 902, 901. The static arc-striking plates 804, 804', arc-striking parts b01a, b01a' and contact parts b01b, b01b' are installed together or in an integrated form. In this embodiment, the static arc-striking plates 804, 804', arc-striking parts b01a, b01a' and contact parts b01b, b01b' are in an integrated form. Figure 2 As shown, movable arc-striking plates 808 and 808' are arranged on one side of the left arc-extinguishing chamber 902 and the right arc-extinguishing chamber 901, corresponding to the left moving contact a2 and the right moving contact a3, respectively. The structure of the static contact assemblies b01 and b01' can effectively contact the protruding contact portions a201 and a301 provided on the left and right moving contacts a2 and a3 in the contact base a1, which move vertically. At the same time, they can also match the position of the arc-striking structure group 8, facilitating the rapid entry of the interrupted arc into the arc-extinguishing chamber.

[0082] As attached Figure 18 As shown, the left arc extinguishing chamber 902 and / or the right arc extinguishing chamber 901 in the arc extinguishing chamber group 9 are arranged obliquely on both sides of the double-breakpoint moving contact system a to independently extinguish the arc generated when the corresponding left moving contact a2 and right moving contact a3 in the double-breakpoint moving contact system a are disconnected. The arc inlets of the left arc extinguishing chamber 902 and the right arc extinguishing chamber 901 correspond to the arc outlets of the corresponding arc striking channels 805 and 805', respectively, and the arc outlets of the left arc extinguishing chamber 902 and the right arc extinguishing chamber 901 correspond to the corresponding exhaust ports 502 and 502' on the housing 5. The arc generated by the left moving contact a2 and right moving contact a3 in the dual-breakpoint moving contact system a, and the corresponding static contact assemblies b01 and b01' in the dual-breakpoint static contact system b, respectively, flows through the corresponding arc-ignition channels 805 and 805' into the corresponding left and right arc-extinguishing chambers 902 and 901, respectively, after extinguishing the arc and then exiting the housing through the corresponding exhaust ports 502 and 502'. Different moving contacts corresponding to different arc-extinguishing chambers effectively improve the arc-extinguishing capacity of the arc-extinguishing chambers and enhance the circuit breaker's breaking performance.

[0083] The working principle of the above-mentioned circuit breaker is as follows: when normal current flows through the circuit, the circuit breaker is in the closed state, the lock catch 7 and the trip catch 6 are locked together, and the reaction spring 13 cannot push the rotating shaft 3 to rotate, thereby avoiding accidental closing of the circuit; when the circuit breaker needs to be manually opened, the rotation of the operating handle 1 drives the upper connecting rod 2 to move, and the upper connecting rod 2, the trip catch 6, the lock catch 7 and the rotating shaft 3 form a connecting rod mechanism, so the movement of the upper connecting rod 2 will drive the rotating shaft 3 to rotate, thereby driving the disconnection of the double-breakpoint moving contact system a and the double-breakpoint static contact system b to realize the opening of the circuit breaker.

[0084] When a small overload current appears in the circuit, the bimetallic strip 1103 in the thermal trip system 11 deforms due to heat and strikes the trip rod 701, causing the lock 7 to rotate and unlock the trip 6. When a large instantaneous current appears in the circuit, power is applied to the magnetic trip system 10, and the trip member 1007 pushes the lock 7 to rotate and unlock the trip 6. When an abnormal fault current appears in either circuit, the trip lock is unlocked, and the shaft 3 can rotate under the action of the reaction spring 13, driving the disconnection of the dual-breakpoint moving contact system a and the corresponding dual-breakpoint static contact system b. During this process, the trip acceleration spring a6 provides a downward pulling force to the contact base a1, causing it to tend to move downward, thereby accelerating the trip speed.

[0085] Example 2

[0086] As attached Figure 22 As shown, in this embodiment, the left arc extinguishing chamber 902 and / or the right arc extinguishing chamber 901 in the arc extinguishing chamber group 9 are horizontally arranged on both sides of the double-breakpoint moving contact system a. Other structures and working principles are the same as those in embodiment 1.

[0087] An embodiment of the present invention provides a double-breakpoint circuit breaker for a DC system. The circuit breaker converts the rotation of the handle into the up-and-down movement of the moving contact system by improving the shaft structure and the installation position, thereby achieving the purpose of double breakpoints. The up-and-down movement of the double-breakpoint moving contact system does not require linear motion. The moving contact relies on the action of a pressure spring to maintain the tendency to rotate to both sides, thereby achieving close contact with the static contact assembly, simplifying the installation difficulty of the product and improving the reliability and stability of motion transmission. At the same time, the layout of the entire circuit breaker enables more arc-extinguishing grids to be arranged in the circuit breaker, thereby improving the breaking capacity of the circuit breaker. It should also be noted that the above technical solution can not only be used for circuit breakers, but any technical solution inspired by the technical ideas of the present invention should be deemed to fall within the scope of protection of the present invention.

[0088] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0089] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A double-breakpoint circuit breaker for a DC system, characterized by: The invention comprises an operating handle (1), wherein the operating handle (1) is linked to a rotating shaft (3) via an upper connecting rod (2), a tripping buckle (6) and a locking buckle (7), and the rotating shaft (3) is connected to a double-breakpoint moving contact system (a) via a lower connecting rod (4). During the rotation of the operating handle (1), the rotating shaft (3) can be driven to rotate via the upper connecting rod (2), the tripping buckle (6) and the locking buckle (7), and during the rotation of the rotating shaft (3), the double-breakpoint moving contact system (a) can be driven to move up and down via the lower connecting rod (4), thereby making the double-breakpoint moving contact system (a) and the corresponding double-breakpoint static contact system (b) contact and separate, thereby realizing the on-off of the circuit breaker.

2. A double-breakpoint circuit breaker for a DC system according to claim 1, characterized in that: The operating handle (1) is arranged above the inner cavity of the housing (5), and the operating end of the operating handle (1) extends out of the housing (5); the rotating shaft (3) is arranged at a right position below the operating handle (1); the double-breakpoint moving contact system (a) is arranged directly below the operating handle (1) and can move in the housing (5) space on the left side of the rotating shaft (3); arc striking structure groups (8) and arc extinguishing chamber groups (9) are arranged in sequence in the housing (5) space below the rotating shaft (3) on both sides of the double-breakpoint moving contact system (a); and the double-breakpoint static contact system (b) is provided with an arc striking structure group (8) and an arc extinguishing chamber group (9) in sequence in the upper and lower parts. Corresponding to the double-break moving contact system (a), a magnetic tripping system (10) is installed on the side of the housing (5) where the rotating shaft (3) is installed, located outside the right arc extinguishing chamber (901) in the arc extinguishing chamber group (9), and a thermal tripping system (11) is installed on the side of the housing (5) away from the rotating shaft (3) where the rotating shaft (3) is installed, located outside the left arc extinguishing chamber (902) in the arc extinguishing chamber group (9). The bimetallic strip (1103) in the thermal tripping system (11) extends to the bottom position above the double-break moving contact system (a) and is linked to a tripping rod (701) extending from the lock (7).

3. A double-breakpoint circuit breaker for a DC system according to claim 2, characterized in that: A right wiring terminal (1006) is installed in the housing (5) outside the magnetic tripping system (10).

4. A double-breakpoint circuit breaker for a DC system according to claim 2, characterized in that: The jump buckle (6) and the lock buckle (7) are arranged on the rotating shaft (3).

5. The double-breakpoint circuit breaker for a DC system according to claim 1, wherein: The operating handle (1) drives the jump buckle (6) to rotate via the upper connecting rod (2); during the rotation of the jump buckle (6), the jump buckle (6) can be linked with the lock buckle (7) to achieve locking of the operating mechanism.

6. A double-breakpoint circuit breaker for a DC system according to claim 5, characterized in that: The lock buckle (7) can release the lock of the trip buckle (6) under the action of a thermal tripping system (11) or a magnetic tripping system (10).

7. A double-breakpoint circuit breaker for a DC system according to claim 3, characterized in that: The rotating shaft (3) is rotatably mounted in the inner cavity of the shell (5), the jump buckle (6) is rotatably mounted on the rotating shaft (3), the lock buckle (7) is rotatably mounted on the rotating shaft (3), and the reset torsion spring (12) is mounted on the lock buckle (7), with one end abutting against the raised platform (301) on the rotating shaft (3) and the other end abutting against the raised platform (702) on the lock buckle (7). One end of the upper connecting rod (2) is pivotally connected to the operating handle (1), and the other end is pivotally connected to the driving hole (601) on the jump buckle (6). A linkage arm (703) extends from the lock buckle (7), and a linkage step (602) corresponding to the linkage arm (703) is provided on the jump buckle (6).

8. A double-breakpoint circuit breaker for a DC system according to claim 7, characterized in that: A cantilever (302) extends from the rotating shaft (3), one end of a lower connecting rod (4) is mounted on the end of the cantilever (302), and the other end is mounted on the contact seat (a1) of the double-breakpoint moving contact system (a).

9. A double-breakpoint circuit breaker for a DC system according to claim 7, characterized in that: The rotating shaft (3) is connected to a reaction spring (13) for accelerating the opening speed.

10. A double-breakpoint circuit breaker for a DC system according to claim 1 or 2, characterized in that: The double-breakpoint moving contact system (a) includes a contact base (a1), a left moving contact (a2) and a right moving contact (a3) ​​rotatably mounted on both sides of the contact base (a1), insulating parts (a5, a5') being mounted on the outer surfaces of the contact parts of the left moving contact (a2) and the right moving contact (a3), and two ends of a pressure spring (a4) respectively abutting against the inner sides of the corresponding insulating parts (a5, a5'), and the left moving contact (a2) and the right moving contact (a3) ​​being connected via a soft connection (a8).

11. A double-breakpoint circuit breaker for a DC system according to claim 10, characterized in that: The protruding contact portions (a201, a301) provided on the left moving contact (a2) and the right moving contact (a3) ​​expose the insulating parts (a5, 5') and correspond to the double-breakpoint static contact system (b).

12. A double-breakpoint circuit breaker for a DC system according to claim 10, characterized in that: The contact seat (a1) can slide up and down on the housing (5) through the sliding groove (501).

13. The double-breakpoint circuit breaker for a DC system according to claim 10, wherein: The contact seat (a1) is connected to a switch-off acceleration spring (a6).

14. A double-breakpoint circuit breaker for a DC system according to claim 10, characterized in that: The mounting portions of the left moving contact (a2) and the right moving contact (a3) ​​are rotatably mounted in the moving contact mounting grooves (a101, a101') on both sides of the inner cavity of the contact base (a1) via contact shafts (a7, a7').

15. The double-breakpoint circuit breaker for a DC system according to claim 6, wherein: The magnetic tripping system (10) comprises a coil support (1001), a coil (1002) is sleeved on the coil support (1001), a moving iron core (1003) is mounted in an inner cavity of the coil support (1001), a push rod (1004) is mounted on the upper end of the moving iron core (1003), a magnetic yoke (1005) is connected to the lower end of the moving iron core (1003) located outside the coil support (1001), the coil (1002) is connected to a right terminal (1006), a tripping member (1007) is mounted on the push rod (1004), and the tripping member (1007) is linked with the lock (7) to unlock the lock (7).

16. A double-breakpoint circuit breaker for a DC system according to claim 15, characterized in that: One end of the magnetic yoke (1005) is mounted on the lower end of the moving iron core (1003) outside the coil support (1001), and the other end extends to the outside of the coil (1002).

17. A double-breakpoint circuit breaker for a DC system according to claim 15, characterized in that: One end of the release member (1007) is fixed on the push rod (1004), and the other end extends to one side of the lock buckle (7) to be linked with the lock buckle (7).

18. A double-breakpoint circuit breaker for a DC system according to claim 15, characterized in that: The release member (1007) comprises a frame-shaped push rod linkage portion (1007a) and a lock unlocking push portion (1007b); the frame-shaped push rod linkage portion (1007a) is placed on the push rod (1004); one side of the frame-shaped push rod linkage portion (1007a) is bent toward the lock (7) to form a lock unlocking push portion (1007b) for linkage with the lock (7); and a support portion (1007c) is provided on one side of the frame-shaped push rod linkage portion (1007a).

19. The double-breakpoint circuit breaker for a DC system according to claim 6, wherein: The thermal trip system (11) comprises a left wiring terminal (1101), one end of a connector (1102) is connected to the left wiring terminal (1101), and the other end is connected to one end of a bimetallic strip (1103), and the other end of the bimetallic strip (1103) corresponds to a trip rod (701) extending from a lock catch (7).

20. A double-breakpoint circuit breaker for a DC system according to claim 19, characterized in that: The tripping rod (701) extends from the lock catch (7) and then from the rear end of the cantilever (302) on the rotating shaft (3) to a position corresponding to the other end of the bimetallic strip (1103).

21. The double-breakpoint circuit breaker for a DC system according to claim 19, wherein: The position of the connecting member (1102) is adjustable.

22. A double-breakpoint circuit breaker for a DC system according to claim 19, characterized in that: The left wiring terminal (1101) comprises a left wiring frame (1101a), the left wiring frame (1101a) is installed in a left wiring terminal installation slot (505) in a housing (5), a left wiring screw (1101b) is installed on the left wiring frame (1101a), and a left wiring board (1101c) is connected to the left wiring frame (1101a) at one end and to a connector (1102) at the other end.

23. The double-breakpoint circuit breaker for a DC system according to claim 2, wherein: The arc-striking structure group (8) comprises an upper magnetic conductive sheet (801, 801') arranged on the back of the arc-striking portion (b01a, b01a') of the static contact assembly (b01, b01') in the double-breakpoint static contact system (b), a front ceramic sheet (806, 806') and a rear ceramic sheet (807, 807') are respectively arranged on the front and rear sides of the arc-striking portion (b01a, b01a'), a front magnetic conductive sheet (802, 802') and a rear magnetic conductive sheet (803, 803') are respectively installed on the outer sides of the front ceramic sheet (806, 806') and the rear ceramic sheet (807, 807'), the front ceramic sheet (806, 806'), the rear ceramic sheet (807, 807'), the arc-striking portion (b01a, b01a') and the rear ceramic sheet (807, 807') are respectively a'), an upper magnetic conductive sheet (801, 801'), a front magnetic conductive sheet (802, 802'), and a rear magnetic conductive sheet (803, 803') constitute an arc striking channel (805, 805'), an arc outlet of the arc striking channel (805, 805') corresponds to an arc entrance of an arc extinguishing chamber group (9), and an arc entrance of the arc striking channel (805, 805') corresponds to a contact portion of a double-breakpoint moving contact system (a) and a double-breakpoint static contact system (b).

24. A double-breakpoint circuit breaker for a DC system according to claim 23, characterized in that: The static contact assembly (b01, b01') includes an arc-striking portion (b01a, b01a'), the tail of the arc-striking portion (b01a, b01a') is connected to a downward-bent static arc-striking plate (804, 804'), the front of the arc-striking portion (b01a, b01a') extends to a contact portion (b01b, b01b') bent upward, and the contact portion (b01b, b01b') is equipped with a static silver point (b01c, b01c').

25. A double-breakpoint circuit breaker for a DC system according to claim 24, characterized in that: The static arc-striking plates (804, 804') extend to the top ends of the corresponding arc-extinguishing grids of the left arc-extinguishing chamber (902) and the right arc-extinguishing chamber (901).

26. A double-breakpoint circuit breaker for a DC system according to claim 25, characterized in that: Moving arc-striking plates (808, 808') are arranged on one side end of the left arc-extinguishing chamber (902) and the right arc-extinguishing chamber (901) corresponding to the left moving contact (a2) and the right moving contact (a3), respectively.

27. A double-breakpoint circuit breaker for a DC system according to claim 2, characterized in that: The left arc extinguishing chamber (902) and / or the right arc extinguishing chamber (901) in the arc extinguishing chamber group (9) are arranged horizontally or obliquely on both sides of the double-breakpoint moving contact system (a) to independently extinguish the arc generated when the corresponding left moving contact (a2) and right moving contact (a3) ​​in the double-breakpoint moving contact system (a) are disconnected.

28. A double-break circuit breaker for a DC system according to claim 27, characterized in that: The arc inlets of the left arc extinguishing chamber (902) and the right arc extinguishing chamber (901) respectively correspond to the arc outlets of the corresponding arc striking channels (805, 805'), and the arc outlets of the left arc extinguishing chamber (902) and the right arc extinguishing chamber (901) correspond to the corresponding exhaust ports (502, 502') on the housing (5).

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