A circuit breaker

Abstract

The present invention relates to a circuit breaker capable of realizing N-pole post-tripping during remote tripping and opening, comprising an L-pole circuit breaker, an N-pole circuit breaker and a remote opening controller, wherein the L-pole lock buckle and the N-pole lock buckle are connected via a lock buckle shaft, and the N-pole lock buckle is provided with a socket for realizing delayed tripping, one end of the lock buckle shaft is connected and matched with the remote opening controller, the lock buckle shaft passes through the socket on the N-pole lock buckle, and the other end is connected and matched with the L-pole lock buckle, and the shape of the socket is configured to accommodate the lock buckle shaft so as to conflict with it after a certain active stroke, the remote opening controller receives a remote signal and drives the lock buckle shaft to generate a tripping stroke, and the L-pole lock buckle connected and matched with the other end of the lock buckle shaft is synchronously driven to trip and open, but the N-pole lock buckle is delayed in being driven to trip and open because the lock buckle shaft conflicts with the socket after a certain active stroke.

Description

Technical Field

[0001] The invention relates to the field of switchgear, in particular to a circuit breaker, and in particular to an improvement of a remote tripping and opening mechanism thereof. Background Art

[0002] In circuit breakers with N poles, there is often a design requirement that the N pole is closed first and then opened. On the one hand, the N pole is closed first and then opened to ensure that the arc generated by the N pole circuit breaker is small (or even no arc is generated), the impact on the device is low, and the safety is high. At the same time, the N pole circuit breaker does not need to be equipped with an arc extinguishing chamber, which has more abundant installation space; on the other hand, if the circuit breaker is virtual closed or virtual opened (that is, the circuit breaker is not completely closed or opened), since the N pole is closed first and then opened, at this time, the N pole can only be in the closed state or the N pole is not completely disconnected. Therefore, although the circuit breaker is not completely opened or closed, it is guaranteed that only the N line is connected to the load, avoiding the risk of electric shock for operators during maintenance.

[0003] However, the existing circuit breakers with the N-pole closing-before-opening design are mostly used in the manual closing and opening process of the circuit breaker, but are difficult to implement in the application of remote automatic opening. For example, an existing multi-pole circuit breaker with a shunt release is composed of an L-pole circuit breaker, an N-pole circuit breaker and an S-pole shunt release connected in series in sequence. When receiving the shunt signal, the shunt release first acts on the lock of the N-pole circuit breaker to trip and open the N-pole circuit breaker. The lock of the N-pole circuit breaker then links the locks of the circuit breakers of other poles to open the circuit breakers of other poles, which cannot meet the design requirement of N-pole opening last. Summary of the invention

[0004] Therefore, in view of the above problems, the present invention proposes a circuit breaker with optimized structure to solve the design requirement of N-pole delayed opening in the remote opening link.

[0005] The present invention is implemented by the following technical solutions:

[0006] The present invention proposes a circuit breaker, comprising a remote trip controller, an N-pole circuit breaker and an L-pole circuit breaker, wherein the L-pole circuit breaker comprises an L-pole lock for realizing its tripping and tripping, and the N-pole circuit breaker comprises an N-pole lock for realizing its tripping and tripping, and also comprises a lock shaft, wherein the N-pole lock is provided with a socket for realizing delayed tripping, one end of the lock shaft is connected and matched with the remote trip controller, the lock shaft passes through the socket on the N-pole lock, and the other end is connected and matched with the L-pole lock, the shape of the socket is configured to accommodate the shape of the lock shaft that conflicts with it after a certain active stroke, the remote trip controller receives a remote signal and drives the lock shaft to generate a tripping stroke, and the L-pole lock connected and matched with the other end of the lock shaft is synchronously driven to trip and trip, but the N-pole lock is delayed because the lock shaft conflicts with the socket after a certain active stroke.

[0007] In order to reduce the wear of the locking shaft, in one embodiment, the shape of the socket is preferably a waist-shaped hole that matches the release travel route of the locking shaft.

[0008] In order to reduce the wear of the locking shaft, in one embodiment, the width of the waist-shaped hole is preferably slightly larger than the outer diameter of the locking shaft.

[0009] Among them, based on installation and manufacturing considerations, in one embodiment, it is preferred that the other end of the lock shaft is plug-fitted and fixed with the L-pole lock.

[0010] Among them, as a preferred embodiment, the circuit breaker is a multi-pole circuit breaker, including L1-pole circuit breaker, L2-pole circuit breaker and L3-pole circuit breaker corresponding to three-phase current, the L1-pole circuit breaker, L2-pole circuit breaker, L3-pole circuit breaker, N-pole circuit breaker and remote opening controller are arranged in pole connection in sequence, and the L-pole lock is arranged on the L3-pole circuit breaker adjacent to the N-pole circuit breaker. Or, as another preferred embodiment, the L-pole circuit breaker includes only one L-pole circuit breaker.

[0011] Among them, the L1-pole circuit breaker includes a first lock for realizing its tripping and opening, the L2-pole circuit breaker includes a second lock for realizing its tripping and opening, and the L3-pole circuit breaker includes a third lock as the L-pole lock for realizing its tripping and opening, and the first lock, the second lock and the third lock are linked and connected.

[0012] Among them, in order to save more effort, the L1 pole circuit breaker preferably also includes a first locking shaft with one end inserted and fixed on the first locking buckle, and the L2 pole circuit breaker also includes a second locking shaft with one end inserted and fixed on the second locking buckle, the other end of the first locking shaft is inserted in the second locking buckle, and the other end of the second locking shaft is inserted in the third locking buckle, so that when the third locking buckle moves, the second locking buckle is first linked to move, and the second locking buckle then links to move the first locking buckle.

[0013] Furthermore, the L3-pole circuit breaker also includes a third locking shaft with one end plugged and fixed on the third locking buckle and serving as the locking shaft. The remote opening controller is a shunt release, including a shunt push rod for driving the opening. The third locking shaft passes through the socket on the N-pole locking buckle and extends into the shunt release, and is actuated by the push of the shunt push rod.

[0014] In order to ensure the stability of the plug-in fixation, it is preferred that the ends of the first locking shaft, the second locking shaft and the third locking shaft that are plug-in-fitted are all rolled with patterns.

[0015] Among them, in order to realize the closing and opening of the N-pole circuit breaker first during manual opening and closing, it is preferred that the N-pole circuit breaker and the L-pole circuit breaker overlap each other in the arrangement direction of the circuit breakers, and the static contact of the N-pole circuit breaker is arranged further forward than the static contact of the L-pole circuit breaker, so that the spacing between the moving and static contacts in the N-pole circuit breaker is smaller than the spacing between the moving and static contacts in the L-pole circuit breaker.

[0016] The present invention has the following beneficial effects: the present invention realizes the N-pole rear opening when the circuit breaker is remotely opened, has a simple structure, and has good reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a bottom view of the multi-pole circuit breaker in Embodiment 1;

[0018] Figure 2 is a disassembly diagram of the multi-pole circuit breaker in Example 1;

[0019] Figure 3 is a front view of the multi-pole circuit breaker in Example 1;

[0020] Figure 4 yes Figure 3 Sectional view at AA in the middle;

[0021] Figure 5 is a schematic diagram of the first lock buckle, the second lock buckle, the third lock buckle, the fourth lock buckle, the first lock buckle shaft, the second lock buckle shaft, the third lock buckle shaft and the shunt push rod in Example 1;

[0022] Figure 6 is a schematic diagram of the fourth lock buckle in Example 1;

[0023] Figure 7 is a structural exploded view of the third locking shaft, the fourth locking shaft and the shunt push rod in Example 1;

[0024] Figure 8 is a schematic diagram of the electromagnetic drive mechanism of the S-pole shunt release in Example 1 pushing the shunt push rod;

[0025] Fig. 9 is a schematic diagram of the shunt push rod in Example 1 pushing the third locking shaft to move in the waist-shaped hole;

[0026] Fig.10 It is a schematic diagram of the shunt push rod in Example 1 pushing the third locking shaft to contact the waist-shaped hole;

[0027] Fig.11 is a side view of the multi-pole circuit breaker in Embodiment 1;

[0028] Fig.12 yes Fig.11 Sectional view at the middle BB;

[0029] Fig.13 It is a schematic diagram of the circuit breaker in Example 2. DETAILED DESCRIPTION

[0030] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0031] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0032] Embodiment 1:

[0033] See also Figure 1-2 As shown, as a preferred embodiment of the present invention, a multi-pole circuit breaker is provided, comprising an L1-pole circuit breaker 1, an L2-pole circuit breaker 2, an L3-pole circuit breaker 3, an N-pole circuit breaker 4 and an S-pole shunt release 5 which are connected in series in sequence. The L1-pole circuit breaker 1, the L2-pole circuit breaker 2 and the L3-pole circuit breaker 3 correspond to three-phase power supplies respectively, the N-pole circuit breaker 4 corresponds to the neutral line, and the S-pole shunt release 5 is used to receive shunt signals and drive the remote shunt release of each pole circuit breaker to open.

[0034] See also Figure 4-5The L1-pole circuit breaker 1 includes a first lock 11 for realizing its tripping and a first lock shaft 12 plugged and fixed on the first lock 11; the L2-pole circuit breaker 2 includes a second lock 21 for realizing its tripping and a second lock shaft 22 plugged and fixed on the second lock 21; the L3-pole circuit breaker 3 includes a third lock 31 (as an L-pole lock) for realizing its tripping and a third lock shaft 32 plugged and fixed on the third lock 31, the N-pole circuit breaker 4 includes a fourth lock 41 (i.e., the N-pole lock), and the S-pole shunt releaser 5 includes a shunt push rod 51.

[0035] The first lock buckle 11, the second lock buckle 21, the third lock buckle 31 and the fourth lock buckle 41 are arranged side by side, the first lock buckle shaft 12 is also inserted into the linkage hole of the second lock buckle 21, and the second lock buckle shaft 22 is also inserted into the linkage hole of the third lock buckle 31. Through the linkage of the first lock buckle shaft 12 and the second lock buckle shaft 22, the L1 pole circuit breaker 1, the L2 pole circuit breaker 2 and the L3 pole circuit breaker 3 are linked as a whole, and the linkage of the L3 pole circuit breaker 3 and the N pole circuit breaker 4 is realized by the third lock buckle 31 (as the L pole lock buckle), the third lock buckle shaft 32 and the fourth lock buckle 41 (as the N pole lock buckle).

[0036] like Figure 6 The fourth lock buckle 41 is provided with a waist-shaped hole 411 (as a plug hole) for realizing delayed release, and the ... waist-shaped hole 411 is provided with a waist-shaped hole 411 (as a plug hole) for realizing delayed release Figure 5 and Figure 7 , the third lock shaft 32 passes through the waist-shaped hole 411 of the fourth lock 41 and extends into the S-pole shunt release 5 to cooperate with the actuation of the shunt push rod 51. Figure 8 As shown, in the S-pole shunt release 5, an electromagnetic drive mechanism 52 pushes the shunt push rod 51 to swing, and the shunt push rod 51 pushes the third lock shaft 32 during the swinging process. When pushed by the shunt push rod 51, the third lock shaft 32 has a tripping stroke to trip and open the circuit breaker of each pole, and the waist-shaped hole 411 is opened along the tripping stroke route of the third lock shaft 32.

[0037] like Figure 8-9As shown, the working principle of this embodiment is: when the S-pole shunt release 5 receives the shunt signal, the shunt push rod 51 swings and pushes the third lock shaft 32, so that the third lock shaft 32 has a tripping stroke, the third lock shaft 32 is linked to the third lock 31, and the third lock 31 is linked to the second lock 21, and then the second lock 21 is linked to the first lock 11, so that the L3-pole circuit breaker 3, the L2-pole circuit breaker 2 and the L1-pole circuit breaker 1 are tripped and opened; at the same time, since the insertion hole on the fourth lock 41 is a waist-shaped hole 411, during the process of the third lock 31, the second lock 21 and the first lock 11 moving and tripping, the third lock shaft 32 is still moving in the waist-shaped hole 411, and finally the third lock shaft 32 abuts against the end of the waist-shaped hole 411, and then the fourth lock 41 is triggered, and the third lock shaft 32 pushes against the end of the waist-shaped hole 411 to make the fourth lock 41 move and trip, thereby achieving the purpose of N-pole delayed opening.

[0038] In this embodiment, the insertion hole on the fourth lock buckle 41 is a waist-shaped hole 411, but in other embodiments, it can also be replaced by a hole of other structures, such as a fan-shaped hole, a round hole with a larger aperture, a square hole, a special-shaped hole, etc., as long as the insertion hole is configured to accommodate the third lock buckle shaft 32 and only interfere with it after a certain range of motion. In this example, the waist-shaped hole 411 is used, which can better match the shunt swing path of the third lock buckle shaft 32 and reduce the wear of the third lock buckle shaft 32. On this basis, a more preferred solution is that the width of the waist-shaped hole 411 is slightly larger than the outer diameter of the third lock buckle shaft 32 to further reduce the wear of the third lock buckle shaft 32.

[0039] The cooperation between the third lock shaft 32 and the third lock 31 can be any cooperation mode as long as it can achieve synchronous linkage, that is, when the third lock shaft 32 performs its tripping and opening swing, it can drive the third lock 31 to move synchronously with it. For example, in addition to the plug-in fit fixation adopted in this embodiment, snap-on, screw-on and other forms can also be adopted. This embodiment adopts plug-in fit fixation to connect and match the third lock shaft 32 with the third lock 31, which is more convenient for installation and manufacturing. In order to ensure the stability of the fit, the plug-in ends of the third lock shaft 32 and the third lock 31 can be knurled. Similarly, the plug-in ends of the first lock shaft 12 and the second lock shaft 22 can also be knurled.

[0040] In this embodiment, the third locking shaft 32 is extended so that it passes through the waist-shaped hole 411 provided on the fourth locking shaft 41 and extends into the S-pole shunt releaser 5 to cooperate with the shunt push rod 51. The manufacturing cost is low and the assembly process is simple. More importantly, the N-pole post-disconnection is very reliable, realizing the design requirement of the N-pole delayed post-disconnection in the remote shunt tripping link.

[0041] In this embodiment, the linkage connection of the L1 pole circuit breaker 1, the L2 pole circuit breaker 2 and the L3 pole circuit breaker 3 is realized by the second locking shaft 22 and the first locking shaft 12. In other embodiments, only one locking shaft may be used, that is, the one locking shaft simultaneously connects the L1 pole circuit breaker 1, the L2 pole circuit breaker 2 and the L3 pole circuit breaker 3 in series to realize the linkage connection of the three. However, in such a structure, one locking shaft needs to push three circuit breaker locks at the same time, which is more laborious and requires a large driving force. In this embodiment, the second locking shaft 22 and the first locking shaft 12 are used to form a segmented linkage. The third lock 31 is first linked to the second lock 21 through the second locking shaft 22, and then the second lock 21 is linked to the first lock 11 through the first locking shaft 12. The required driving force is small and more labor-saving.

[0042] The above-mentioned sections of the locking shaft (the first locking shaft 12, the second locking shaft 22 and the third locking shaft 32) can be of different shapes (such as different cross-sectional shapes, different thicknesses, etc.), but based on modular production and the difficulty of manufacturing and assembly, it is preferred that the shapes of the sections of the locking shaft are the same, so the shapes of the sockets on the first lock 11, the second lock 21 and the third lock 31 can also be set to be the same.

[0043] The S-pole shunt release 5 of the present embodiment is substantially a remote trip controller, and in other embodiments it may be replaced by an overvoltage release, an undervoltage release, or an over- or under-voltage release.

[0044] This embodiment realizes that when a multi-pole circuit breaker is remotely opened, the N-pole circuit breaker is opened after a delay. On this basis, this embodiment also sets the N-pole circuit breaker to close first and then open in the case of manual opening and closing. Fig.12 As shown, the L1-pole circuit breaker 1 includes an L1-pole static contact 13 and an L1-pole moving contact 14, the L2-pole circuit breaker 2 includes an L2-pole static contact 23 and an L2-pole moving contact 24, the L3-pole circuit breaker 3 includes an L3-pole static contact 33 and an L3-pole moving contact 34, and the N-pole circuit breaker 4 includes an N-pole static contact 43 and an N-pole moving contact 44, wherein the positions of the L1-pole moving contact 14, the L2-pole moving contact 24, the L3-pole moving contact 34 and the N-pole moving contact 44 overlap with each other in the arrangement direction of the multi-pole circuit breakers (i.e., the left-right direction as shown in the figure), and the position of the N-pole static contact 43 is arranged further forward than the static contact positions of each L-pole circuit breaker (i.e., the L1-pole static contact 13, the L2-pole static contact 23 and the L3-pole static contact 33), so that the spacing between the moving and static contacts in the N-pole circuit breaker 4 ( Fig.12 The distance between the moving and static contacts in each L-pole circuit breaker is smaller than the distance between the moving and static contacts in each L-pole circuit breaker. Fig.12Indicated by S2). Then, when closing manually, the N-pole circuit breaker 4 will close first due to the smaller spacing between the moving and static contacts, and will have a certain overtravel after the L-pole circuit breaker is closed. When opening manually, the N-pole circuit breaker 4 needs to recover the overtravel first, so the N-pole circuit breaker 4 will also open later. Moreover, in this embodiment, the third locking shaft 32 passes through the waist-shaped hole 411 of the N pole. When the shunt is tripped, the shunt push rod pushes the third locking shaft 31 to unlock, and the third locking shaft 32 continues to move before it conflicts with the waist-shaped hole 411, driving the N pole to unlock. In this process, the N-pole static contact 43 is arranged forward and has a larger overtravel than the L-pole static contact, which will also delay the disconnection of the N-pole contact when the shunt is tripped.

[0045] Embodiment 2:

[0046] The present embodiment provides a circuit breaker, comprising an L-pole circuit breaker 6, an N-pole circuit breaker 7 and an S-pole shunt release 8 which are connected in parallel in sequence, wherein the cooperation between the L-pole circuit breaker 6 and the N-pole circuit breaker 7 is the same as the cooperation between the L3-pole circuit breaker 3 and the N-pole circuit breaker 4 in Embodiment 1, and the locking shaft 61 of the L-pole circuit breaker 6 passes through the waist-shaped hole opened on the locking buckle of the N-pole circuit breaker 7 and extends into the S-pole shunt release 8, which has the same effect as that of Embodiment 1, and realizes the post-tripping of the remote tripping of the N-pole circuit breaker.

[0047] The present embodiment is different from the first embodiment in that there is only one L-pole circuit breaker. Obviously, the number of L-pole circuit breakers does not affect the coordination with the N-pole circuit breaker. Whether it is a solution with only one L-pole circuit breaker as in the present embodiment or a solution with three L-pole circuit breakers as in the first embodiment, the above-mentioned N-pole rear-divided structure can be adopted.

[0048] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes in form and details made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims will fall within the scope of protection of the present invention.

Claims

1. A circuit breaker, comprising an L-pole circuit breaker, an N-pole circuit breaker and a remote trip controller, wherein the L-pole circuit breaker comprises an L-pole lock for realizing its tripping and tripping, and the N-pole circuit breaker comprises an N-pole lock for realizing its tripping and tripping, Features: It also includes a locking shaft, and the N-pole locking shaft is provided with a socket for realizing delayed tripping. One end of the locking shaft is connected and cooperated with the remote opening controller. The locking shaft passes through the socket on the N-pole locking shaft, and the other end is connected and cooperated with the L-pole locking shaft. The shape of the socket is configured to accommodate the locking shaft and the shape of the locking shaft will not conflict with it until a certain activity stroke has been completed. The remote opening controller receives a remote signal and drives the locking shaft to produce a tripping stroke. The L-pole locking shaft connected and cooperated with the other end of the locking shaft is synchronously driven to trip and open the gate. However, the N-pole locking shaft will not conflict with the socket until a certain activity stroke has been completed, so that the locking shaft will be driven to trip and open the gate with a delay.

2. The circuit breaker according to claim 1, Features: The shape of the insertion hole is a waist-shaped hole that matches the release travel route of the locking shaft.

3. The circuit breaker according to claim 2, Features: The width of the waist-shaped hole is slightly larger than the outer diameter of the locking shaft.

4. The circuit breaker according to claim 1, Features: The other end of the lock shaft is plug-fitted and fixed with the L-pole lock.

5. The circuit breaker according to claim 1 or 2, Features: The circuit breaker is a multi-pole circuit breaker, including an L1-pole circuit breaker, an L2-pole circuit breaker and an L3-pole circuit breaker corresponding to three-phase current. The L1-pole circuit breaker, the L2-pole circuit breaker, the L3-pole circuit breaker, the N-pole circuit breaker and the remote opening controller are arranged in cascade in sequence, and the L-pole lock is set on the L3-pole circuit breaker adjacent to the N-pole circuit breaker.

6. The circuit breaker according to claim 5, Features: The L1-pole circuit breaker includes a first lock for realizing its tripping and opening, the L2-pole circuit breaker includes a second lock for realizing its tripping and opening, and the L3-pole circuit breaker includes a third lock as the L-pole lock for realizing its tripping and opening, and the first lock, the second lock and the third lock are linked and connected.

7. The circuit breaker according to claim 6, Features: The L1 pole circuit breaker also includes a first locking shaft with one end inserted and fixed on the first locking buckle, and the L2 pole circuit breaker also includes a second locking shaft with one end inserted and fixed on the second locking buckle, the other end of the first locking shaft is inserted in the second locking buckle, and the other end of the second locking shaft is inserted in the third locking buckle, so that when the third locking buckle moves, the second locking buckle is first linked to move, and the second locking buckle then links to move the first locking buckle.

8. The circuit breaker according to claim 7, Features: The L3-pole circuit breaker also includes a third locking shaft with one end plugged and fixed on the third locking buckle and serving as the locking shaft. The remote opening controller is a shunt release, including a shunt push rod for driving the opening. The third locking shaft passes through the socket on the N-pole locking buckle and extends into the shunt release, and is actuated by the push of the shunt push rod.

9. The circuit breaker according to claim 8, Features: One end of the first locking shaft, the second locking shaft and the third locking shaft for plug-fitting and fixing are all rolled with patterns.

10. The circuit breaker according to claim 1 or 2, Features: The moving contacts of the N-pole circuit breaker and the L-pole circuit breaker overlap with each other in the arrangement direction of the circuit breakers, and the static contact of the N-pole circuit breaker is arranged further forward than the static contact of the L-pole circuit breaker, so that the spacing between the moving and static contacts in the N-pole circuit breaker is smaller than the spacing between the moving and static contacts in the L-pole circuit breaker.

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