circuit breaker

Abstract

This invention relates to the field of low-voltage electrical appliances, specifically to a circuit breaker, which includes a contact mechanism comprising a first contact structure and a second contact structure pivotally disposed opposite to each other; the contact mechanism further includes a first connecting rod, a second connecting rod, and a sliding block, the two ends of the first connecting rod being hinged to the sliding block and the first contact structure, respectively, and the two ends of the second connecting rod being hinged to the sliding block and the second contact structure, respectively; the sliding block, through the first connecting rod and the second connecting rod, drives the first contact structure and the second contact structure to rotate synchronously towards each other to close and synchronously in opposite directions to open; the circuit breaker has a faster breaking speed and a larger opening distance.

Description

Technical Field

[0001] This invention relates to the field of low-voltage electrical appliances, and more specifically to a circuit breaker. Background Technology

[0002] In circuit breakers, the breaking speed and opening distance of the contact mechanism are key parameters for improving the breaking performance. Existing circuit breakers consist of a moving contact and a stationary contact that cooperates with it. The operating mechanism drives the moving contact to swing, closing or opening with the stationary contact. The breaking speed of the moving contact mainly depends on the operating mechanism's action time, and the breaking speed of the operating mechanism in current technology cannot be significantly improved. Furthermore, with the miniaturization of circuit breakers, the internal space is decreasing, especially for circuit breakers. Due to space constraints, the range of motion of the operating mechanism is limited, and the contact opening distance cannot be significantly increased. Therefore, the breaking speed and opening distance of existing contact mechanisms cannot meet the ever-increasing breaking requirements. Moreover, relying solely on the arc-extinguishing chamber, the breaking speed of the contact mechanism, and the opening distance cannot further improve the breaking performance of the circuit breaker. Summary of the Invention

[0003] The purpose of this invention is to overcome at least one defect of the prior art and provide a circuit breaker with a faster breaking speed and a larger opening distance.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A circuit breaker includes a contact mechanism comprising a first contact structure and a second contact structure pivotally disposed opposite to each other; the contact mechanism further includes a first connecting rod, a second connecting rod, and a sliding block; the two ends of the first connecting rod are hinged to the sliding block and the first contact structure, respectively, and the two ends of the second connecting rod are hinged to the sliding block and the second contact structure, respectively; the sliding block drives the first contact structure and the second contact structure to rotate synchronously towards each other to close and synchronously in opposite directions to open, respectively, through the first connecting rod and the second connecting rod.

[0006] Furthermore, the slider, the first connecting rod, and the second connecting rod are respectively located between the first contact structure and the second contact structure, and the first connecting rod and the second connecting rod are arranged in a V-shape;

[0007] One end of the first contact structure is pivotally mounted around a first center, and one end of the second contact structure is pivotally mounted around a second center. The other ends of the first contact structure and the other ends of the second contact structure cooperate with each other to close or disconnect.

[0008] One end of the first connecting rod is hinged to the slider and the other end is hinged to the first contact structure; one end of the second connecting rod is hinged to the slider and the other end is hinged to the second contact structure.

[0009] Furthermore, the first and second connecting rods are respectively hinged to the slider around the third center.

[0010] Furthermore, the first connecting rod is hinged to the slider around the first sub-center, and the second connecting rod is hinged to the slider around the second sub-center, with the first and second sub-centers arranged parallel to each other.

[0011] Furthermore, the circuit breaker also includes an operating mechanism, which is connected to the contact mechanism to drive it to close and open. The operating mechanism includes a pivotally mounted operating element, a main connecting rod, a trip latch, and a locking latch. The trip latch and the locking latch are pivotally mounted on the first contact structure or the second contact structure and are overlapped. The two ends of the main connecting rod are respectively hinged to the operating element and the trip latch.

[0012] Furthermore, the circuit breaker also includes an operating mechanism, which is connected to the contact mechanism to drive it to close and open. The operating mechanism includes an operating element, a main connecting rod, a trip latch, a locking latch, a support element, and a support element connecting rod. The operating element and the support element are pivotally mounted, the trip latch and the locking latch are pivotally mounted on the support element, and the two ends of the main connecting rod are hinged to the operating element and the trip latch, respectively.

[0013] The two ends of the support member connecting rod are respectively hinged to the support member and the slider;

[0014] Alternatively, one end of the support member connecting rod is hinged to the support member, and the other end is hinged to the first contact structure or the second contact structure.

[0015] Furthermore, the first contact structure and the second contact structure are both pivotally arranged around the center of the contact mechanism. One end of the first connecting rod is hinged to the slider and the other end is hinged to one end of the first contact structure around the third sub-center. One end of the second connecting rod is hinged to the slider and the other end is hinged to one end of the second contact structure around the fourth sub-center. The slider, the third sub-center, the center of the contact mechanism, and the fourth sub-center are respectively located at the four vertices of a quadrilateral.

[0016] Furthermore, the circuit breaker also includes an operating mechanism, which is connected to the contact mechanism to drive it to close and open. The operating mechanism includes an operating element, a main connecting rod, a trip latch, a locking latch, and a support element. The operating element and the support element are pivotally mounted, and the trip latch and the locking latch are pivotally mounted on the support element. The two ends of the main connecting rod are hinged to the operating element and the trip latch, respectively, and the support element is connected to the slider in a driving manner.

[0017] Furthermore, both the first and second connecting rods are hinged to the support member around the fifth center via a connecting rod hinge axis, which is a slider.

[0018] Furthermore, the circuit breaker also includes a baffle. When the first contact structure and the second contact structure are closed, the baffle is driven to move out between the first contact point of the first contact structure and the second contact point of the second contact structure. When the first contact structure and the second contact structure are disconnected, the baffle is driven to move into the space between the first contact point and the second contact point.

[0019] Furthermore, the circuit breaker also includes a baffle. When the first contact structure and the second contact structure are closed, the baffle is driven to move out between the first contact point of the first contact structure and the second contact point of the second contact structure. When the first contact structure and the second contact structure are disconnected, the baffle is driven to move into the space between the first contact point and the second contact point. The slider and the baffle are connected and move synchronously.

[0020] Furthermore, the first contact structure and the second contact structure are symmetrically pivoted, and the first connecting rod and the second connecting rod are symmetrically arranged.

[0021] Furthermore, the circuit breaker also includes an incoming terminal and an outgoing terminal, with the incoming terminal, the first contact structure, the second contact structure, and the outgoing terminal arranged side by side in sequence along the length of the circuit breaker; the arc inlet of the arc-extinguishing chamber is matched with the breaking interval formed by the separation of the first contact structure and the second contact structure; in the height direction of the circuit breaker, the two ends of the breaking interval are respectively directed toward the operating element and the arc inlet of the arc-extinguishing chamber.

[0022] Furthermore, the arc-extinguishing chamber includes multiple arc-extinguishing grid plates, which are arranged side by side at intervals along the length of the circuit breaker.

[0023] Furthermore, the rotation centers of the operating element, the first contact structure, and the second contact structure are located at the three vertices of an acute-angled triangle.

[0024] Furthermore, the first contact structure includes a first support and a first contact pivotally disposed around a first center, with one end of the first contact inserted into the first support and the other end provided with a first contact point;

[0025] The second contact structure includes a second support pivotally disposed around a second center and a second contact disposed on the second support, with one end of the second contact inserted into the second support and the other end disposed as a second contact point;

[0026] The first contact structure and the second contact structure rotate synchronously in opposite directions or away from each other, causing the first contact and the second contact to close or open.

[0027] Furthermore, the first connecting rod and the second connecting rod are hinged to the first support and the second support, respectively; the first connecting rod and the second connecting rod have the same structure.

[0028] Furthermore, the first contact structure also includes a first contact spring, the first contact being rotatably disposed relative to the first support, and the first contact spring being disposed between the first contact and the first support;

[0029] And / or, the second contact structure further includes a second contact spring, the second contact being rotatably disposed relative to the second support, the second contact spring being disposed between the second contact and the second support.

[0030] The circuit breaker of this invention has a first contact structure and a second contact structure that are pivotally mounted opposite each other. When the circuit breaks, they rotate synchronously in opposite directions. This allows the first and second contact structures to rotate within a limited space, resulting in a larger opening distance, saving internal space of the switching device, and facilitating design and layout. It also achieves a greater breaking speed and improves breaking performance. Furthermore, the slider drives the two contact structures through two connecting rods, ensuring reliable and stable transmission and guaranteeing the synchronicity of their rotation.

[0031] In addition, when the first contact structure and the second contact structure are disconnected, the baffle moves between the first contact and the second contact to provide a forced arc-blocking function, thereby further improving the breaking performance of the circuit breaker.

[0032] Furthermore, the first and second contact structures are symmetrically pivoted, allowing them to rotate within a limited space and achieve a larger opening distance. This saves internal space in the switching device, improves breaking performance, facilitates design and layout, and enhances aesthetics.

[0033] In addition, the first and second connecting rods have the same structure, which helps to reduce the types of parts in the circuit breaker and improve assembly efficiency. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the contact mechanism of the circuit breaker according to the first embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of the contact mechanism of the circuit breaker according to the first embodiment of the present invention;

[0036] Figure 3 This is a cross-sectional structural diagram of the first contact structure of the present invention;

[0037] Figure 4 This is a schematic diagram of the circuit breaker according to the first embodiment of the present invention;

[0038] Figure 5 This is a schematic diagram showing the connection between the operating mechanism and the contact mechanism of the circuit breaker according to the second embodiment of the present invention;

[0039] Figure 6This is a schematic diagram showing the connection between the operating mechanism and the contact mechanism of the circuit breaker according to the third embodiment of the present invention;

[0040] Figure 7 This is a schematic diagram showing the connection between the operating mechanism and the contact mechanism of the circuit breaker according to the fourth embodiment of the present invention;

[0041] Figure 8 This is a connection principle diagram of the operating mechanism and contact mechanism of the circuit breaker according to the fourth embodiment of the present invention.

[0042] Explanation of reference numerals in the attached figures:

[0043] 1. Operating mechanism; 11. Operating component; 12. Main connecting rod; 13. Jumper; 14. Lock; 15. Linked rocker arm; 16. Slider; 17s. Third center; 17-21. First branch connecting rod; 17-22. Second branch connecting rod; 17-23. Support connecting rod; 17-1s. First branch center; 17-2s. Second branch center; 17-3s. Third branch center; 17-4s. Fourth branch center; 18. Support component; 18s. Support connecting rod center; 19s. Fifth center; 2. Contact mechanism; 21. First contact structure; 211. First contact; 2110. First contact point; 2111. First contact arm; 212. First support; 2 120 First support body; 21200 First support cavity; 21201 First contact insertion hole; 2124 First support shaft; 2126 First contact limiting block; 2127 First contact spring shaft; 213 First contact spring; 21s First center; 22 Second contact structure; 221 Second contact; 2210 Second contact point; 222 Second support; 2220 Second support body; 2222 Second support shaft; 2224 Second contact limiting block; 23 Baffle; 2s Contact mechanism center; 31 Incoming terminal; 32 Outgoing terminal; 4 Arc extinguishing chamber; 40 Arc extinguishing grid; Thermomagnetic tripping mechanism 5. Detailed Implementation

[0044] The following embodiments, in conjunction with the accompanying drawings, further illustrate specific implementations of the circuit breaker of the present invention. The circuit breaker of the present invention is not limited to the descriptions in the following embodiments.

[0045] like Figure 1-4 The diagram shows a first embodiment of the circuit breaker of the present invention.

[0046] The circuit breaker of this embodiment includes a contact mechanism 2, which includes a first contact structure 21 and a second contact structure 22 that are pivotally disposed opposite to each other. The contact mechanism 2 also includes a first connecting rod 17-21, a second connecting rod 17-22, and a sliding block 16. The two ends of the first connecting rod 17-21 are hinged to the sliding block 16 and the first contact structure 21, respectively. The two ends of the second connecting rod 17-22 are hinged to the sliding block 16 and the second contact structure 22, respectively. The sliding block 16 drives the first contact structure 21 and the second contact structure 22 to rotate synchronously towards each other to close and synchronously towards each other to open, respectively, through the first connecting rod 17-21 and the second connecting rod 17-22. Furthermore, when the first contact structure 21 and the second contact structure 22 rotate synchronously towards each other, their rotation directions are opposite, and the first contact point 2110 of the first contact structure 21 and the second contact point 2210 of the second contact structure 22 approach each other to close; when the first contact structure 21 and the second contact structure 22 rotate synchronously away from each other, their rotation directions are opposite, and the first contact point 2110 of the first contact structure 21 and the second contact point 2210 of the second contact structure 22 move away from each other to break.

[0047] The circuit breaker of the present invention has a slider 16 of the contact mechanism 2 that drives the first contact structure 21 and the second contact structure 22 through the first connecting rod 17-21 and the second connecting rod 17-22 respectively, so that the two rotate synchronously in opposite directions or synchronously in opposite directions. The transmission is stable and reliable. Moreover, compared with the existing double contact structure with one moving and one stationary contact, the opening distance is doubled, which significantly improves the breaking performance of the circuit breaker.

[0048] like Figure 1-2As shown in Figure 4, the first contact structure 21 and the second contact structure 22 are symmetrically pivoted. The symmetrical pivoting arrangement of the first contact structure 21 and the second contact structure 22 means that their rotation centers and rotation angles are symmetrical. This allows the first contact structure 21 and the second contact structure 22 to rotate within a limited space while having a larger opening distance, saving internal space in the switching device, improving breaking performance, facilitating design and layout, and enhancing aesthetics. Furthermore, the first contact structure 21 includes a first support 212 and a first contact 211 pivotally disposed around a first center 21s. One end of the first contact 211 is inserted into the first support 212, and the other end is provided with a first contact point 2110. The first contact 211 rotates around the first center 21s under the drive of the first support 212. The second contact structure 22 includes a second support 222 and a second contact 221 pivotally disposed around a second center 22s. One end of the second contact 221 is inserted into the second support 222, and the other end is provided with a second contact point 2210. The second contact 221 rotates around the second center 22s under the drive of the first support 212. The first support 212 and the second support 222 rotate synchronously towards each other or synchronously away from each other, causing the first contact point 2110 and the second contact point 2210 to close or open.

[0049] like Figure 1-2 As shown in Figure 4, in the circuit breaker of the first embodiment, the slider 16, the first connecting rod 17-21, and the second connecting rod 17-22 are respectively located between the first contact structure 21 and the second contact structure 22. The first connecting rod 17-21 and the second connecting rod 17-22 are arranged in a V-shape. The first contact structure 21 is pivotally mounted around the first center 21s, and the second contact structure 22 is pivotally mounted around the second center 22s. The other end of the first contact structure 21 and the other end of the second contact structure 22 cooperate with each other to close or open (that is, the first contact point 2110 of the first contact structure 21 and the second contact point 2210 of the second contact structure 22 cooperate with each other to close or open). One end of the first connecting rod 17-21 is hinged to the slider 16 and the other end is hinged to the first contact structure 21. One end of the second connecting rod 17-22 is hinged to the slider 16 and the other end is hinged to the second contact structure 22. Furthermore, one end of the first connecting rod 17-21 is hinged to the slider 16 and the other end is hinged to the middle of the first contact structure 21, where the middle of the first contact structure 21 refers to the portion of the first contact structure 21 located between the first center 21s and the first contact point 2110 of the first contact structure 21; one end of the second connecting rod 17-22 is hinged to the slider 16 and the other end is hinged to the middle of the second contact structure 22, where the middle of the second contact structure 22 refers to the portion of the second contact structure 22 located between the second center 22s and the second contact point 2210 of the second contact structure 22.

[0050] like Figure 1 As shown, the first connecting rod 17-21 and the second connecting rod 17-22 are hinged to the slider 16 around the third center 17s, that is, the first connecting rod 17-21 and the second connecting rod 17-22 are rotatably connected to the slider 16 around the same axis; the first connecting rod 17-21 is hinged to the first contact structure 21 around the third sub-center 17-3s, and the second connecting rod 17-22 is hinged to the second contact structure 22 around the fourth sub-center 17-4s. Furthermore, the third center 17s, the first center 21s, and the second center 22s are respectively located at the three vertices of an isosceles triangle, and the first center 21s and the second center 22s are respectively located at the vertices corresponding to the two base angles of the isosceles triangle.

[0051] Furthermore, such as Figure 1-2 As shown in Figure 4, the first connecting rod 17-21 and the second connecting rod 17-22 are arranged symmetrically. Furthermore, the first connecting rod 17-21 and the second connecting rod 17-22 have the same structure.

[0052] Furthermore, such as Figure 2 and 4 As shown, the first connecting rod 17-21 and the second connecting rod 17-22 are hinged to the first support 212 and the second support 222 respectively. That is, one end of the first connecting rod 17-21 is hinged to the slider 16 and the other end is hinged to the first support 212, and one end of the second connecting rod 17-22 is hinged to the slider 16 and the other end is hinged to the second support 222, which is beneficial to improving insulation performance.

[0053] As other embodiments, such as Figure 2 and 4 As shown, the first connecting rod 17-21 is hinged to the slider 16 around the first sub-center 17-1s, and the second connecting rod 17-22 is hinged to the slider 16 around the second sub-center 17-2s. The first sub-center 17-1s and the second sub-center 17-2s are arranged parallel to each other.

[0054] like Figure 4 As shown, the circuit breaker in this embodiment also includes an operating mechanism 1. The operating mechanism 1 is connected to the contact mechanism 2 to drive the first contact structure 21 and the second contact structure 22 to rotate synchronously towards each other to close and synchronously in opposite directions to open. Further, the operating mechanism 1 includes an operating member 11, a main connecting rod 12, a trip latch 13, and a locking latch 14. The trip latch 13 and the locking latch 14 are pivotally mounted on the first contact structure 21 or the second contact structure 22 and overlapped. The two ends of the main connecting rod 12 are hinged to the operating member 11 and the trip latch 13, respectively. Further, the rotation centers of the operating member 11, the first contact structure 21, and the second contact structure 22 are located at the three vertices of an acute-angled triangle.

[0055] Furthermore, such as Figure 2 and 4 As shown, the jump buckle 13 and the locking buckle 14 are pivotally mounted on the first support 212. The working principle of the operating mechanism 1 is the same as that of the prior art, and will not be described in detail here.

[0056] In another embodiment, the snap 13 and the latch 14 are pivotally mounted on the second support 222.

[0057] like Figure 4 As shown, the locking structure of the operating mechanism 1 also includes a connecting rocker arm 15. The connecting rocker arm 15 and the lock 14 are arranged on the same axis of rotation and rotate synchronously. The connecting rocker arm 15 and the lock 14 are stacked along the axis of rotation of the lock 14. The connecting rocker arm 15 is driven to rotate by the thermal release structure of the thermomagnetic release mechanism 5. The connecting rocker arm 15 drives the lock 14 to rotate, thereby releasing its latching engagement with the jump buckle 13. The lock 14 is driven to rotate by the magnetic release structure of the thermomagnetic release mechanism 5, thereby releasing the latching engagement between the lock 14 and the jump buckle 13. Furthermore, the thermal release structure directly drives the connecting rocker arm 15 to rotate through a pivotally mounted thermal release transmission member 55. The connecting rocker arm 15 drives the lock 14 to rotate, thereby releasing its latching engagement with the jump buckle 13. The magnetic release structure directly drives the lock 14 to rotate through a pivotally mounted magnetic release transmission member 54, thereby releasing its latching engagement with the jump buckle 13.

[0058] like Figure 4 As shown, the latch 14, the first support 212, and the connecting rocker arm 15 are stacked sequentially along the rotation axis of the latch 14, with the latch 14 and the connecting rocker arm 15 located on both sides of the first support 212. The latch 14 and the connecting rocker arm 15 cooperate to provide more options for the engagement points of the operating mechanism 1 and the thermomagnetic release mechanism 5, facilitating layout and structural design.

[0059] like Figure 2 and 4 As shown, the circuit breaker in this embodiment also includes a baffle 23. When the first contact structure 21 and the second contact structure 22 are closed, the baffle 23 is driven to move out between the first contact point 2110 of the first contact structure 21 and the second contact point 2210 of the second contact structure 22. When the first contact structure 21 and the second contact structure 22 are open, the baffle 23 is driven to move into the space between the first contact point 2110 and the second contact point 2210. The baffle 23 functions to forcibly interrupt the arc, which helps to improve the breaking capacity of the circuit breaker in this embodiment. Specifically, as shown... Figure 2 and 4In the indicated direction, when the first contact structure 21 and the second contact structure 22 are closed, the baffle 23 is driven to move upward and move out of the space between the first contact point 2110 and the second contact point 2210; when the first contact structure 21 and the second contact structure 22 are disconnected, the baffle 23 is driven to move downward and move into the space between the first contact point 2110 and the second contact point 2210.

[0060] Furthermore, such as Figure 2 and 4 As shown, the slider 16 and the baffle 23 are connected and move synchronously. Furthermore, the slider 16 and the baffle 23 are an integral structure, which helps to reduce the number of circuit breaker components and improve installation efficiency and operational stability.

[0061] like Figure 2 , 4 As shown, the circuit breaker in this embodiment also includes a circuit breaker housing, a slider 16 slidably disposed on the circuit breaker housing, and a first contact structure 21 and a second contact structure 22 pivotally disposed on the circuit breaker housing, respectively; as Figure 2 As shown, the first support 212 is provided with a first support shaft 2124, and the first support 212 is pivotally mounted on the circuit breaker housing via the first support shaft 2124. The second support 222 is provided with a second support shaft 2222, and the second support 222 is pivotally mounted on the circuit breaker housing via the second support shaft 2222.

[0062] like Figure 3 As shown, the first contact structure 21 further includes a first contact spring 213. The first contact 211 is rotatably disposed relative to the first support 212, and the first contact spring 213 is disposed between the first contact 211 and the first support 212. The first contact spring 213 applies a first force to the first contact 211. After the first contact 211 separates from the second contact 222, that is, after the first contact point 2110 of the first contact 211 and the second contact point 2210 of the second contact 221 disengage, the first force causes the first contact 211 to be limited and engaged with the first support 212 and remain relatively stationary. When the first contact 211 and the second contact 221 are closed, the first contact 211 rotates relative to the first support 212, causing the first contact spring 213 to store energy. The first force causes the first contact 211 to press the second contact 221, that is, the first contact spring 213 provides an overtravel force to the first contact 211, ensuring that the first contact 211 and the second contact 221 are reliably closed.

[0063] like Figure 3As shown, the first contact 211, the first support 212, and the first contact spring 213 are assembled in the following manner: The first support 212 includes a first support body 2120 and a first contact limiting block 2126. The first support body 2120 has a first support cavity 21200 in the middle, and a first contact insertion hole 21201 is provided on the side wall of the first support cavity 21200. One end of the first contact 211 is inserted into the first support cavity 21200 through the first contact insertion hole 21201. The first contact limiting block 2126 is disposed on the outer side wall of the first support body 2120 and located on one side of the first contact insertion hole 21201. The first contact spring 213 is disposed within the first support cavity 21200. A torsion spring has one end that is limited and engaged with the inner wall of the first support cavity 21200, and the other end that is limited and engaged with the end of the first contact 211 that is inserted into the first support cavity 21200, so that the first contact 211 abuts against the first contact limiting block 2126. The first contact 211 is rotatably set relative to the first support 212 with the first contact limiting block 2126 as support. The above assembly method is simple in structure and reliable in assembly, ensuring reliable operation of the first contact structure 21. The first contact limiting block 2126 is also used to cover the part of the first contact 211 that protrudes outside the first support 212 and is close to the first support 212, which helps to increase the electrical clearance and creepage distance after the first contact structure 21 and the second contact structure 22 are separated. Furthermore, the first support 212 also includes a first contact spring shaft 2127 disposed therein, and a first contact spring 213 is sleeved on the first contact spring shaft 2127.

[0064] In another embodiment, the first contact spring 213 can also be configured as a tension spring, with its two ends respectively hooked to one end of the first contact 211 inserted into the first support cavity 21200 and the first contact spring shaft 2127. Of course, the setting position of the first contact spring shaft 2127 needs to be adjusted accordingly.

[0065] like Figure 2 , 4As shown, the second contact structure 22 also includes a second contact spring (not shown in the figure). The second contact 221 is rotatably disposed relative to the second support 222, and the second contact spring is disposed between the second contact 221 and the second support 222. The second contact spring applies a second force to the second contact 221. After the second contact 221 separates from the first contact 211, that is, after the second contact point 2210 of the second contact 221 and the first contact point 2110 of the first contact 211 disengage, the second force causes the second contact 221 to be limited and engaged with the second support 222 and remain relatively stationary. When the second contact 221 and the first contact 211 are closed, the second contact 221 rotates relative to the second support 222, allowing the second contact spring to continue to function. The second force causes the second contact 221 to press against the first contact 211, which means that the second contact spring provides an overtravel force to the second contact 221, ensuring that the second contact 221 and the first contact 211 are reliably closed. The second contact limiting block 2224 is also used to block the part of the second contact 221 that protrudes outside the second support 222 and is close to the second support 222, which helps to increase the electrical clearance and creepage distance after the first contact structure 21 and the second contact structure 22 are separated.

[0066] Reference Figure 3 As shown, the second contact 221, the second support 222, and the second contact spring are assembled in the following manner: The second support 222 includes a second support body 2220 and a second contact limiting block 2224. The second support body 2220 has a second support cavity in the middle, and the side wall of the second support cavity has a second contact insertion hole. The second contact spring shaft is disposed in the second support cavity. One end of the second contact 221 is inserted into the second support cavity through the second contact insertion hole. The second contact limiting block 2224 is disposed on the outer side wall of the second support body 2220 and located on one side of the second contact insertion hole. The second contact spring is a torsion spring disposed in the second support cavity. One end is limited to the inner side wall of the second support cavity, and the other end is limited to the end of the second contact 221 inserted into the second support cavity, so that the second contact abuts against the second contact limiting block 2224. The second contact 221 is rotatably disposed relative to the second support 222 with the second contact limiting block 2224 as support. Furthermore, the second support 222 also includes a second support shaft 2222, with two second support shafts 2222 respectively disposed at both axial ends of the second support body 2220. Furthermore, the second support 222 also includes a second contact spring shaft disposed within the second support body 2220, with a second contact spring sleeved on the second contact spring shaft.

[0067] In another embodiment, the second contact spring can also be configured as a tension spring, with its two ends respectively hooked to one end of the second contact 221 inserted into the second support cavity and the second contact spring shaft. Of course, the setting position of the second contact spring shaft needs to be adjusted accordingly.

[0068] The contact mechanism 2 further includes a contact return spring structure, which includes a first return spring. The first return spring applies a force to the first support 212, causing the first contact structure 21 to rotate towards its broken position. Simultaneously, the first contact structure 21 drives the second contact structure 22 to rotate towards its broken position via the first connecting rod 17-21, the slider 16, and the second connecting rod 17-22. Alternatively, the contact return spring structure includes a second return spring, which applies a force to the second support 222, causing the second contact structure 22 to rotate towards its broken position. Simultaneously, the second contact structure 22 drives the first contact structure 21 to rotate towards its broken position via the second connecting rod 17-22, the slider 16, and the first connecting rod 17-21. The first contact structure 21 and the second contact 22 are symmetrically pivoted, therefore, either the first return spring or the second return spring can be selected to simplify the structure of the contact mechanism 2. Of course, both the first return spring and the second return spring can also be used simultaneously.

[0069] Furthermore, the first reset spring is a torsion spring, coaxially arranged with the first support 212, with one end of the torsion spring cooperating with the first support 212 and the other end cooperating with the circuit breaker housing; and / or, the second reset spring is a torsion spring, coaxially arranged with the second support 222, with one end of the torsion spring cooperating with the second support 222 and the other end cooperating with the circuit breaker housing.

[0070] like Figure 2 and 3 As shown, the first contact 211 includes a first contact point 2110 and a first contact arm 2111. The first contact arm 2111 has a V-shaped structure, including an outer section and an inner section. One end of the outer section is provided with the first contact point 2110, and the other end is bent and connected to one end of the inner section. The other end of the inner section is inserted into the first support 212. The outer section is bent away from the second contact 221 relative to the inner section. Furthermore, the included angle between the outer section and the inner section is an obtuse angle.

[0071] like Figure 2 As shown, the first contact 211 and the second contact 212 are symmetrical structures, and the structure of the second contact 212 will not be described in detail here.

[0072] like Figure 4As shown, the circuit breaker in this embodiment also includes an incoming terminal 31, an outgoing terminal 32, and an arc-extinguishing chamber 4. The incoming terminal 31, the first contact structure 21, the second contact structure 22, and the outgoing terminal 32 are arranged side-by-side in sequence along the length of the circuit breaker. The arc inlet of the arc-extinguishing chamber 4 is matched with the breaking interval formed by the first contact structure 21 and the second contact structure 22. In the height direction of the circuit breaker, the two ends of the breaking interval face the operating member 1 and the arc inlet of the arc-extinguishing chamber 4, respectively. This layout provides more installation space for the arc-extinguishing chamber 4, allowing the circuit breaker to install a larger size arc-extinguishing chamber 4, thereby improving the arc-extinguishing capability. Furthermore, the arc-extinguishing chamber 4 includes multiple arc-extinguishing grid plates 40, which are arranged side-by-side at intervals along the length of the circuit breaker.

[0073] like Figure 4 As shown, in the height direction of the circuit breaker in this embodiment, the operating member 11, the contact mechanism 2, and the arc-extinguishing chamber 4 are arranged sequentially; in the length direction of the circuit breaker in this embodiment, the contact mechanism 2 and the arc-extinguishing chamber 4 are located on one side of the thermomagnetic tripping mechanism 5, and the incoming terminal 31 is located on the other side of the thermomagnetic tripping mechanism 5. Further, the thermal tripping structure includes a bimetallic strip 56, and the magnetic tripping structure is an electromagnetic trip unit. In the height direction of the circuit breaker, the thermal tripping structure and the magnetic tripping structure are arranged side-by-side along the length direction of the bimetallic strip 56. Further, the magnetic tripping structure is a snap-action electromagnetic trip unit or a direct-acting electromagnetic trip unit.

[0074] like Figure 5 The diagram shows a second embodiment of the circuit breaker of the present invention.

[0075] The main difference between the circuit breaker in the second embodiment and the first embodiment lies in the structure of the operating mechanism 1 and the connection structure between the operating mechanism 1 and the contact mechanism 2. Specifically, the operating mechanism 1 includes an operating member 11, a main connecting rod 12, a trip latch 13, a locking latch 14, a support member 18, and support member connecting rods 17-23. The operating member 11 and the support member 18 are pivotally mounted, and the trip latch 13 and the locking latch 14 are pivotally mounted on the support member 18. The two ends of the main connecting rod 12 are hinged to the operating member 11 and the trip latch 13, respectively. The two ends of the support member connecting rods 17-23 are hinged to the support member 18 and the slider 16, respectively. Furthermore, the support member connecting rods 17-23 are hinged to the slider 16 around the center of the connecting rod slider.

[0076] Furthermore, the first connecting rod 17-21 is hinged to the slider 16 around the first sub-center 17-1s, and the second connecting rod 17-22 is hinged to the slider 16 around the second sub-center 17-2s. The first sub-centers 17-1s and 17-2s are arranged parallel to each other. Furthermore, the centers of the connecting rod and slider, the first sub-center 17-1s, and the second sub-center 17-2s are located at the three vertices of a triangle. Furthermore, the triangle is an isosceles triangle, and the first sub-center 17-1s and the second sub-center 17-2s are respectively located at the vertices corresponding to the two base angles of the isosceles triangle. Of course, depending on actual needs, the first connecting rod 17-21 and the second connecting rod 17-22 are hinged to the slider 16 around the same center.

[0077] like Figure 6 The diagram shows a third embodiment of the circuit breaker of the present invention.

[0078] The main difference between the circuit breaker in the third embodiment and the second embodiment lies in the connection structure between the operating mechanism 1 and the contact mechanism 2. Specifically, one end of the support member connecting rod 17-23 is hinged to the support member 18, and the other end is hinged to the first contact structure 21 or the second contact structure 22.

[0079] Furthermore, the support member connecting rod 17-23 is hinged to the first support 212 of the first contact structure 21. Of course, depending on actual needs, the support member connecting rod 17-23 can be changed to be hinged to the second support 222 of the second contact structure 22.

[0080] like Figure 7 and 8 The diagram shows the fourth embodiment of the circuit breaker of the present invention.

[0081] The main difference between the circuit breaker in the fourth embodiment and the third embodiment lies in the structure of the contact mechanism 2 and the connection structure between the contact mechanism 2 and the operating mechanism 1. Specifically, the first contact structure 21 and the second contact structure 22 are both pivotally arranged around the center 2s of the contact mechanism, that is, they are coaxially rotated. One end of the first connecting rod 17-21 is hinged to the slider 16 and the other end is hinged to one end of the first contact structure 21 around the third sub-center 17-3s. One end of the second connecting rod 17-22 is hinged to the slider 16 and the other end is hinged to one end of the second contact structure 22 around the fourth sub-center 17-4s. The slider 16, the third sub-center 17-3s, the center 2s of the contact mechanism, and the fourth sub-center 17-4s are located at the four vertices of a quadrilateral.

[0082] Furthermore, the support member 18 of the operating mechanism 1 is connected to the slider 16 in a transmission manner.

[0083] Furthermore, both the first connecting rod 17-21 and the second connecting rod 17-22 are hinged to the support member 18 around the fifth center 19s via a connecting rod hinge axis. That is, both the first connecting rod 17-21 and the second connecting rod 17-22 are hinged to the support member 18 via a connecting rod hinge axis, and the axis of the connecting rod hinge axis coincides with the fifth center 19s; the connecting rod hinge axis serves as the slider 16.

[0084] It should be noted that in the description of this invention, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship conventionally placed during use. They are used only for ease of description and do not indicate that the device or element referred to must have a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating relative importance.

[0085] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A circuit breaker comprising a contact mechanism (2), the contact mechanism (2) comprising a first contact structure (21) and a second contact structure (22) pivotally disposed opposite to each other; characterized in that: The contact mechanism (2) further includes a first connecting rod (17-21), a second connecting rod (17-22), and a sliding block (16). The two ends of the first connecting rod (17-21) are hinged to the slider (16) and the first contact structure (21), respectively. The two ends of the second connecting rod (17-22) are hinged to the slider (16) and the second contact structure (22), respectively. The slider (16) drives the first contact structure (21) and the second contact structure (22) to rotate synchronously in opposite directions through the first connecting rod (17-21) and the second connecting rod (17-22), thereby closing the first contact structure (21) and the second contact structure (22). The slider (16) drives the first contact structure (21) and the second contact structure (22) to rotate synchronously in opposite directions through the first connecting rod (17-21) and the second connecting rod (17-22), thereby separating the first contact structure (21) and the second contact structure (22).

2. The circuit breaker according to claim 1, characterized in that: The slider (16), the first connecting rod (17-21) and the second connecting rod (17-22) are located between the first contact structure (21) and the second contact structure (22), respectively, and the first connecting rod (17-21) and the second connecting rod (17-22) are arranged in a V-shape. One end of the first contact structure (21) is pivotally disposed around the first center (21s), and one end of the second contact structure (22) is pivotally disposed around the second center (22s). The other end of the first contact structure (21) and the other end of the second contact structure (22) cooperate with each other to close or disconnect. The first connecting rod (17-21) is hinged at one end to the slider (16) and at the other end to the first contact structure (21); the second connecting rod (17-22) is hinged at one end to the slider (16) and at the other end to the second contact structure (22).

3. The circuit breaker according to claim 2, characterized in that: The first connecting rod (17-21) and the second connecting rod (17-22) are respectively hinged to the slider (16) around the third center (17s).

4. The circuit breaker according to claim 2, characterized in that: The first connecting rod (17-21) is hinged to the slider (16) around the first sub-center (17-1s), and the second connecting rod (17-22) is hinged to the slider (16) around the second sub-center (17-2s). The first sub-center (17-1s) and the second sub-center (17-2s) are set parallel to each other.

5. The circuit breaker according to claim 2, characterized in that: The circuit breaker also includes an operating mechanism (1), which is connected to the contact mechanism (2) to drive it to close and open. The operating mechanism (1) includes a pivotally mounted operating element (11), a main connecting rod (12), a trip latch (13) and a lock (14). The trip latch (13) and the lock (14) are pivotally mounted on the first contact structure (21) or the second contact structure (22) and overlapped. The two ends of the main connecting rod (12) are hinged to the operating element (11) and the trip latch (13) respectively.

6. The circuit breaker according to claim 2, characterized in that: The circuit breaker also includes an operating mechanism (1), which is connected to the contact mechanism (2) to drive it to close and open. The operating mechanism (1) includes an operating member (11), a main connecting rod (12), a trip latch (13), a lock latch (14), a support member (18), and a support member connecting rod (17-23). ​​The operating member (11) and the support member (18) are pivotally mounted respectively. The trip latch (13) and the lock latch (14) are pivotally mounted on the support member (18) respectively. The two ends of the main connecting rod (12) are hinged to the operating member (11) and the trip latch (13) respectively. The two ends of the support member connecting rod (17-23) are respectively hinged to the support member (18) and the slider (16); Alternatively, one end of the support member connecting rod (17-23) is hinged to the support member (18), and the other end is hinged to the first contact structure (21) or the second contact structure (22).

7. The circuit breaker according to claim 1, characterized in that: The first contact structure (21) and the second contact structure (22) are both pivotally arranged around the center (2s) of the contact mechanism. One end of the first connecting rod (17-21) is hinged to the slider (16) and the other end is hinged to one end of the first contact structure (21) around the third sub-center (17-3s). One end of the second connecting rod (17-22) is hinged to the slider (16) and the other end is hinged to one end of the second contact structure (22) around the fourth sub-center (17-4s). The slider (16), the third sub-center (17-3s), the center (2s) of the contact mechanism and the fourth sub-center (17-4s) are located at the four vertices of a quadrilateral.

8. The circuit breaker according to claim 7, characterized in that: The circuit breaker also includes an operating mechanism (1), which is connected to the contact mechanism (2) to drive it to close and open. The operating mechanism (1) includes an operating member (11), a main connecting rod (12), a trip latch (13), a lock latch (14), and a support member (18). The operating member (11) and the support member (18) are pivotally mounted respectively. The trip latch (13) and the lock latch (14) are pivotally mounted on the support member (18). The two ends of the main connecting rod (12) are hinged to the operating member (11) and the trip latch (13) respectively. The support member (18) is connected to the slider (16).

9. The circuit breaker according to claim 8, characterized in that: The first connecting rod (17-21) and the second connecting rod (17-22) are both hinged to the support member (18) around the fifth center (19s) via the connecting rod hinge axis, and the connecting rod hinge axis is the slider (16).

10. The circuit breaker according to claim 1, characterized in that: The circuit breaker also includes a baffle (23). When the first contact structure (21) and the second contact structure (22) are closed, the baffle (23) is driven to move out between the first contact point (2110) of the first contact structure (21) and the second contact point (2210) of the second contact structure (22). When the first contact structure (21) and the second contact structure (22) are disconnected, the baffle (23) is driven to move into the space between the first contact point (2110) and the second contact point (2210).

11. The circuit breaker according to claim 2, characterized in that: The circuit breaker also includes a baffle (23). When the first contact structure (21) and the second contact structure (22) are closed, the baffle (23) is driven to move out between the first contact point (2110) of the first contact structure (21) and the second contact point (2210) of the second contact structure (22). When the first contact structure (21) and the second contact structure (22) are disconnected, the baffle (23) is driven to move into the space between the first contact point (2110) and the second contact point (2210). The slider (16) is connected to the baffle (23) and moves synchronously.

12. The circuit breaker according to claim 1, characterized in that: The first contact structure (21) and the second contact structure (22) are symmetrically pivoted, and the first connecting rod (17-21) and the second connecting rod (17-22) are symmetrically arranged.

13. The circuit breaker according to claim 1, characterized in that: The circuit breaker also includes an operating mechanism (1), an arc-extinguishing chamber (4), an incoming terminal (31), and an outgoing terminal (32); the operating mechanism (1) is connected to the contact mechanism (2) to drive the first contact structure (21) and the second contact structure (22) to rotate synchronously in opposite directions to close and to rotate synchronously in opposite directions to open; the incoming terminal (31), the first contact structure (21), the second contact structure (22), and the outgoing terminal (32) are arranged side by side in the length direction of the circuit breaker; the arc inlet of the arc-extinguishing chamber (4) is matched with the breaking interval formed by the breaking of the first contact structure (21) and the second contact structure (22); in the height direction of the circuit breaker, the two ends of the breaking interval are respectively facing the operating part (11) of the operating mechanism (1) and the arc inlet of the arc-extinguishing chamber (4).

14. The circuit breaker according to claim 13, characterized in that: The arc-extinguishing chamber (4) includes multiple arc-extinguishing grid plates (40), which are arranged side by side at intervals along the length of the circuit breaker.

15. The circuit breaker according to claim 2, characterized in that: The circuit breaker also includes an operating mechanism (1), which is connected to the contact mechanism (2) to drive the first contact structure (21) and the second contact structure (22) to rotate synchronously in opposite directions to close and to rotate synchronously in opposite directions to open; the rotation centers of the operating element (11) of the operating mechanism (1), the first contact structure (21) and the second contact structure (22) are located at the three vertices of an acute triangle.

16. The circuit breaker according to claim 1, characterized in that: The first contact structure (21) includes a first support (212) pivotally disposed around a first center (21s) and a first contact (211). One end of the first contact (211) is inserted into the first support (212), and the other end is provided with a first contact point (2110). The second contact structure (22) includes a second support (222) pivotally disposed around a second center (22s) and a second contact (221) disposed on the second support (222). One end of the second contact (221) is inserted into the second support (222), and the other end is provided with a second contact point (2210). The first contact structure (21) and the second contact structure (22) rotate synchronously towards or away from each other, so that the first contact (2110) and the second contact (2210) close or break.

17. The circuit breaker according to claim 16, characterized in that: The first connecting rod (17-21) is hinged to the first support (212); the second connecting rod (17-22) is hinged to the second support (222); the first connecting rod (17-21) and the second connecting rod (17-22) have the same structure.

18. The circuit breaker according to claim 16, characterized in that: The first contact structure (21) further includes a first contact spring (213), the first contact (211) is rotatably disposed relative to the first support (212), and the first contact spring (213) is disposed between the first contact (211) and the first support (212); And / or, the second contact structure (22) further includes a second contact spring, the second contact (221) being rotatably disposed relative to the second support (222), the second contact spring being disposed between the second contact (221) and the second support (222).

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