Tripping structure of circuit breaker

Abstract

The invention discloses a tripping structure of a circuit breaker. The tripping structure comprises a shell and an operating mechanism, a mounting space is formed in the shell, and the operating mechanism is arranged in the mounting space; the operating mechanism comprises a locking structure; after the locking structure is unlocked, the operation mechanism realizes tripping operation, so that the circuit breaker is broken; the installation space is divided into at least one subspace, and an arc extinguish chamber, a contact system and an electromagnetic release are arranged in the at least one subspace; the arc extinguish chamber is used for extinguishing electric arcs generated when the contact system is separated; the electromagnetic release is provided with a rotationally arranged armature, and the locking structure is provided with a first driving part corresponding to the armature; the arc extinguish chamber is provided with an exhaust port, and the armature is located at the exhaust port; when current exists in the circuit, the attraction force borne by the armature and the air blowing force from the exhaust port are overlapped, so that the armature triggers the first driving part, and the locking structure is promoted to be unlocked. The quick unlocking device has the effect that the armature is driven by airflow to achieve quick unlocking.

Description

Technical Field

[0001] The present application relates to the electrical field of low-voltage switches, and in particular to a tripping structure of a circuit breaker. Background Art

[0002] The operating mechanism of the circuit breaker's tripping structure often has a locking structure. When the circuit breaker is closed, the locking structure is locked, and the operating mechanism remains in a steady state under the action of the locking structure. When an overcurrent occurs in the circuit to be protected, the locking structure is driven by an electromagnetic release (such as a thermal magnetic release, a hydraulic electromagnetic release) to unlock, thereby achieving tripping.

[0003] The armature of the electromagnetic release of the existing circuit breaker can only be actuated by being attracted, which takes a long time and is not conducive to protection.

[0004] Therefore, it is necessary to design a tripping structure that increases the movement speed of the armature so that the locking structure can be quickly unlocked and the product can be quickly disconnected. Summary of the invention

[0005] In view of this, the purpose of the present application is to overcome the deficiencies in the prior art and to provide a tripping structure for a circuit breaker.

[0006] The present application provides: a tripping structure of a circuit breaker, which includes a shell and an operating mechanism; the shell has an installation space, and the operating mechanism is arranged in the installation space; the operating mechanism includes a locking structure, and when the circuit breaker is in a closed state, the locking structure is locked to keep the operating mechanism in a closed state; after the locking structure is unlocked, the operating mechanism performs a tripping operation to cause the circuit breaker to be disconnected; the installation space is divided into at least one subspace, and an arc extinguishing chamber, a contact system and an electromagnetic release are arranged in at least one subspace; the arc extinguishing chamber is used to extinguish the arc generated when the contact system is separated; the electromagnetic release has a rotatably arranged armature, and the locking structure has a first driving part corresponding to the armature; the arc extinguishing chamber has an exhaust port, and the armature is located at the exhaust port; when there is current in the line, the attraction force exerted on the armature and the air blowing force from the exhaust port are superimposed on each other, and together cause the armature to rotate to trigger the first driving part, causing the locking structure to be unlocked.

[0007] In some embodiments of the present application, the arc extinguishing chamber also includes an arc extinguishing chamber shell, and an exhaust port is opened on the arc extinguishing chamber shell; it also includes a mounting bracket, and the electromagnetic release is fixed on the mounting bracket and placed in the subspace through the mounting bracket; the mounting bracket has an air inlet at the armature mounting position, and the exhaust port is aligned with the air inlet.

[0008] In some embodiments of the present application, the arc extinguishing chamber shell and the mounting bracket form a staggered structure, and the staggered structure is arranged around the junction of the air inlet and the exhaust port to improve air tightness.

[0009] In some embodiments of the present application, the arc extinguishing chamber also includes at least two arc extinguishing grids and an air flow channel; there is a gap between two adjacent arc extinguishing grids, the gap is connected to the exhaust port through the air flow channel, the gas generated during the disconnection flows into the air flow channel from the gap, and then is sprayed toward the armature from the exhaust port; the diameter of the exhaust port gradually decreases from close to the air flow channel to close to the air inlet, forming a Laval nozzle.

[0010] In some embodiments of the present application, the outer shell includes a cover shell and a sealing plate, the installation space is arranged on the cover shell, the bottom of the cover shell has an installation opening of the installation space, and the sealing plate is used to close the installation opening; the arc extinguishing chamber also includes at least two arc extinguishing grids, and there is a gap between two adjacent arc extinguishing grids; the arc extinguishing chamber shell and the sealing plate jointly form an air flow channel, the gap is connected to the exhaust port through the air flow channel, and the gas generated during the disconnection flows into the air flow channel from the gap, and then is sprayed toward the armature from the exhaust port.

[0011] In some embodiments of the present application, the arc extinguishing chamber shell includes a first bracket and an upper cover, the arc extinguishing grid is clamped on the first bracket, and the airflow channel is on the first bracket; the first bracket has an open portion connected to the airflow channel, and the upper cover has a shielding portion, which shields part of the open portion to form an exhaust port.

[0012] In some embodiments of the present application, the locking structure includes a first locking member, a second locking member, a third locking member and a locking member return spring; the first locking member, the second locking member, and the third locking member are all rotatably arranged, and from the height direction of the installation space, the rotation center of the second locking member is higher than the rotation center of the third locking member; the first locking member includes a first overlapping portion, the second locking member includes a second overlapping portion and a third overlapping portion, and the third locking member includes a fourth overlapping portion; from the height direction of the installation space, the first overlapping portion and the second overlapping portion are both located between the rotation center of the second locking member and the rotation center of the third locking member. , and is higher than the third overlapping portion and the fourth overlapping portion; when the locking structure is locked, the first overlapping portion and the second overlapping portion, the third overlapping portion and the fourth overlapping portion form abutment, and when the locking structure is unlocked, the first overlapping portion and the second overlapping portion, the third overlapping portion and the fourth overlapping portion are released from abutment; the first driving portion is arranged on the second locking member, and the first driving portion is driven by the armature to rotate the second locking member to realize unlocking of the locking structure; the locking member reset spring abuts between the second locking member and the third locking member, and after the locking structure is unlocked, the first locking member blocks one side of the second locking member to limit the resetting of the locking structure, and the locking member reset spring is in an energy storage state.

[0013] In some embodiments of the present application, the operating mechanism also includes a driving shaft and a transmission part, a transmission handle, a moving contact, and a main spring in the installation space; the first end of the driving shaft passes through the shell, and the second end is in the installation space, and the driving shaft and the shell are rotatably arranged; the transmission part and the second end of the driving shaft form a synchronous movement, and the transmission part deviates from the rotation center of the driving shaft; the transmission handle is rotatably arranged and is in a linkage relationship with the transmission part; one end of the moving contact is hinged to the transmission handle, and the hinge rotates with the transmission handle; the main spring is connected between the moving contact and the first locking member to provide spring force for realizing the state switching of the operating mechanism; when the circuit breaker is in the closed state, the main spring is in the energy storage state, and the operating mechanism remains in a steady state due to the locking of the locking structure, and the locking structure is unlocked After that, the steady state is broken, and the operating mechanism switches to the tripping state under the action of the main spring; the rotation center of the transmission handle, the rotation center of the first locking piece, and the hinge of the moving contact are all arranged in parallel, and are arranged perpendicular to the rotation center of the drive shaft; in the height direction, the rotation center of the transmission handle is higher than the rotation center of the first locking piece, and the hinge is always located between the rotation center of the transmission handle and the rotation center of the first locking piece during the rotation of the transmission handle; the first locking piece also includes a reset part, which is located on the side where the transmission handle moves in the opening direction. When the operating mechanism is in the tripping state, the transmission handle is driven to move in the opening direction, and the transmission handle pushes the reset part to rotate the first locking piece. Under the joint action of the transmission handle and the reset spring of the locking piece, the locking structure is locked.

[0014] In some embodiments of the present application, a mounting bracket is also included, and the second locking member, the third locking member, and the electromagnetic release are all fixed on the mounting bracket and installed in the housing through the mounting bracket; the first locking member is rotatably connected to the wall of the installation space, and the second locking member and the third locking member are rotatably connected to the mounting bracket.

[0015] In some embodiments of the present application, from the perspective of the height of the installation space, the locking structure is located higher than the armature, and the armature is located higher than the exhaust port, and the armature drives the first driving part to move in a pushing manner.

[0016] In some embodiments of the present application, the electromagnetic release is a thermal-magnetic electromagnetic release or a hydraulic electromagnetic release.

[0017] The beneficial effects of this application include: The unlocking speed of the locking structure can be accelerated and the breaking speed can be increased. The reason is that the exhaust port of the arc extinguishing chamber of the present application is aligned with the armature, and the air blowing force and the attractive force (the attractive force generated by the electromagnetic release on the armature when overcurrent occurs) can be superimposed on each other. In this way, in the case of overcurrent, the moving and static contacts of the contact system will be first repelled (temporarily separated) due to the electric repulsion force, and the arc separated by the moving and static contacts will cause the internal air pressure of the circuit breaker to increase, and the gas will be sprayed onto the armature through the exhaust port. Since the armature itself also rotates due to attraction, the movement speed of the armature will be faster with the blowing of this airflow, accelerating the unlocking speed of the locking structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work. Figure 1 An exploded view of a circuit breaker according to Embodiment 1 of the present application is shown; Figure 2 A cross-sectional view of a circuit breaker according to Embodiment 1 of the present application is shown; Figure 3 A schematic diagram showing the coordination between the sealing plate and the arc extinguishing chamber of the circuit breaker in Embodiment 1 of the present application is shown; Figure 4 A schematic diagram showing that the locking structure of the circuit breaker in Embodiment 1 of the present application remains locked; Figure 5 A schematic diagram showing the airflow accelerating the armature movement of the circuit breaker in Embodiment 1 of the present application is shown; Figure 6 A schematic diagram of a mounting bracket in a circuit breaker in Example 1 of the present application is shown; Figure 7 A schematic diagram of an arc extinguishing chamber in a circuit breaker in Example 1 of the present application is shown; Figure 8 A diagram showing the coordination between the mounting bracket and the arc extinguishing chamber in the circuit breaker of Example 1 of the present application is shown; Fig. 9 A schematic diagram of a cover in a circuit breaker in Embodiment 1 of the present application is shown; Fig.10 A schematic diagram showing an electromagnetic release and a locking structure of a circuit breaker in Embodiment 1 of the present application is shown; Fig.11 A schematic diagram showing the electromagnetic release of the circuit breaker in Embodiment 1 of the present application when it is actuated due to a general overcurrent; Fig.12 A schematic diagram of the operating mechanism of the circuit breaker in Embodiment 1 of the present application is shown; Fig.13 A schematic diagram of the operating mechanism (closing) of the circuit breaker in Embodiment 1 of the present application is shown; Fig.14 A schematic diagram of the operating mechanism of the circuit breaker (when the circuit breaker is opened and the locking structure is reset) of Example 1 of the present application is shown; Fig.15 A schematic diagram of the operating mechanism (tripping) of the circuit breaker in Example 1 of the present application is shown; Fig.16 A schematic diagram showing a locking structure of a circuit breaker in a locked state in Embodiment 1 of the present application is shown; Fig.17 A schematic diagram showing a locking structure of a circuit breaker in an unlocked state according to Embodiment 1 of the present application is shown; Fig.18 A schematic diagram showing a locking structure of a circuit breaker in a locked state and a transmission handle in Embodiment 1 of the present application is shown; Fig.19 A schematic diagram showing the driving handle of the circuit breaker in Embodiment 1 of the present application driving the locking structure to restore the locking state; Fig. 20 A schematic diagram showing an electromagnetic release, a second locking member, and a third multiple arrangement of a mounting bracket of a circuit breaker in Embodiment 1 of the present application is shown. DETAILED DESCRIPTION

[0019] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0020] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0021] In addition, the terms "primary" and "secondary" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "primary" or "secondary" may explicitly or implicitly include one or more of the feature. In the description of this application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0022] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0023] In the present application, unless otherwise clearly specified and limited, when a main feature is “above” or “below” a second feature, it can mean that the main feature and the second feature are in direct contact, or the main feature and the second feature are in indirect contact through an intermediate medium. Moreover, when a main feature is “above”, “above” or “above” a second feature, it can mean that the main feature is directly above or obliquely above the second feature, or simply means that the main feature is higher in level than the second feature. When a main feature is “below”, “below” or “below” a second feature, it can mean that the main feature is directly below or obliquely below the second feature, or simply means that the main feature is lower in level than the second feature. Example

[0024] like Figure 1-20 As shown in the figure, an embodiment of the present application provides a tripping structure of a circuit breaker, including the following structure: The housing 1-00 includes a cover 1-01 and a sealing plate 1-02. The cover 1-01 has an installation space 1-03, and the bottom of the cover 1-01 has an installation opening 1-03a of the installation space 1-03. The sealing plate 1-02 and the cover 1-01 are fixed to close the installation opening 1-03a. There are many fixing methods here, such as screw fastening, riveting fixation, etc. The installation space 1-03 is divided into at least one subspace 1-03b, and at least one subspace 1-03b is provided with an arc extinguishing chamber 2-00, a contact system 3-00 and an electromagnetic release 4-00. For a multi-pole circuit breaker, the number of subspaces 1-03b is consistent with the number of poles. In this embodiment, the number of subspaces 1-03b is two, and both subspaces 1-03b are provided with an arc extinguishing chamber 2-00, a contact system 3-00 and an electromagnetic release 4-00. Here, the number of subspaces 1-03b is related to the number of poles of the circuit breaker. For example, for a 1-pole circuit breaker, its subspace 1-03b is located at a number equal to the number of installation spaces 1-03, and the arc extinguishing chamber 2-00, the contact system 3-00 and the electromagnetic release 4-00 are arranged in the subspace 1-03b. For a 3-pole circuit breaker, the number of its subspaces 1-03b is three, and the arc extinguishing chamber 2-00, the contact system 3-00 and the electromagnetic release 4-00 are arranged in the three subspaces 1-03b. For a 4-pole circuit breaker, there are four subspaces 1-03b. It is not necessary that each subspace 1-03b has an arc extinguishing chamber 2-00, a contact system 3-00 and an electromagnetic release 4-00. For example, only three of the subspaces 1-03b may have an arc extinguishing chamber 2-00, a contact system 3-00 and an electromagnetic release 4-00; or it is also possible that all four subspaces 1-03b have an arc extinguishing chamber 2-00 and a contact system 3-00, but only three subspaces 1-03b have an electromagnetic release 4-00.

[0025] The operating mechanism 5-00 has a locking structure 5-04. The locking structure 5-04 has a locked state and an unlocked state, and when the circuit breaker is in the closed state (when the moving and static contacts 3-01 and 3-02 are in contact), the locking structure 5-04 is in the locked state, and the operating mechanism 5-00 is kept in the closed state due to the locked state of the locking structure 5-04; when the locking structure 5-04 is unlocked, the operating mechanism 5-00 realizes a tripping operation (due to the main spring 5-05), which causes the moving and static contacts 3-01 and 3-02 to separate, thereby realizing the circuit breaker disconnection.

[0026] The electromagnetic release 4-00 has an armature 4-01 (not only the armature 4-01, which will be described later according to the specific type of the electromagnetic release 4-00), and the armature 4-01 is set to rotate. The armature 4-01 here has a conventional overcurrent protection function, that is, under normal overcurrent conditions, the armature 4-01 can be attracted and move, triggering the first drive part 5-08d of the locking structure 5-04, causing the locking structure 5-04 to unlock, and realizing the tripping of the operating mechanism 5-00.

[0027] The arc extinguishing chamber 2-00 is located near the contact system 3-00. When the moving and static contacts 3-01 and 3-02 of the contact system 3-00 are separated, the arc is extinguished through the arc extinguishing chamber 2-00.

[0028] The arc quenching chamber 2-00 has an exhaust port 2-01a, and the armature 4-01 is located at the exhaust port 2-01a.

[0029] For the armature 4-01, when there is an overcurrent situation, the armature 4-01 will be attracted by the pole shoe of the oil cup (if it is a thermal magnetic structure, it will be attracted by the static iron core.) and rotate. While the armature 4-01 is attracted, the contact system 3-00 is separated due to the electric repulsion (the moving and static contacts 3-01 and 3-02 are separated due to the electric repulsion generated by the current). Due to the generation of the arc, the air pressure inside the circuit breaker increases, and the gas is ejected to the armature 4-01 through the exhaust port 2-01a of the arc extinguishing chamber 2-00, accelerating the rotation of the armature 4-01 until the first drive part 5-08d of the locking structure 5-04 is triggered, prompting the locking structure 5-04 to unlock, and realizing the tripping of the operating mechanism 5-00. Here, the direction of the air blowing force and the direction of the attraction force on the armature 4-01 do not have to be completely consistent. As long as the two forces can cause the armature 4-01 to rotate in the same direction (the direction of triggering the first drive part 5-08d), the effect of accelerated tripping can be achieved.

[0030] The above-mentioned structure of realizing the tripping of the armature 4-01 by airflow, when applicable to a multi-pole circuit breaker, may be a group of current releases and arc extinguishing chambers 2-00 adopting this structure, or may be all electromagnetic releases 4-00 and their corresponding arc extinguishing chambers 2-00 adopting this structure.

[0031] For the arc extinguishing chamber 2-00, it includes an arc extinguishing chamber shell 2-01, and the exhaust port 2-01a is opened on the arc extinguishing chamber shell 2-01. As for the electromagnetic release 4-00, it is installed on the mounting bracket 4-02, and is placed in the subspace 1-03b through the mounting bracket 4-02 (this is how the product is assembled). The mounting bracket 4-02 has an air inlet 4-02a at the mounting position of the armature 4-01, and the exhaust port 2-01a is aligned with the air inlet 4-02a. In this way, the design of the mounting bracket 4-02, the air inlet 4-02a, and the exhaust port 2-01a aligning with the air inlet 4-02a can make the gas more concentrated, which is conducive to the airflow pushing the armature 4-01 to move. At the same time, the design of the mounting bracket 4-02 will be more conducive to the modular assembly of the electromagnetic release 4-00, which is conducive to the assembly of the product.

[0032] By forming a staggered structure 2-4 between the arc extinguishing chamber shell 2-01 and the mounting bracket 4-02, the staggered structure 2-4 is arranged around the junction of the air inlet 4-02a and the exhaust port 2-01a, which can improve the air tightness, prevent gas from escaping, and make it easier for the airflow to gather at the air inlet 4-02a to push the armature 4-01 to move. There are many ways to form such a staggered structure 2-4, which can be an overlapping arrangement of protrusions and protrusions, or a pairing of protrusions and grooves. No matter which method is used, as long as the staggered structure 2-4 can be arranged around the junction of the air inlet 4-02a and the exhaust port 2-01a, the air tightness of this part can be increased. In this embodiment, the arc extinguishing chamber shell 2-01 has two side walls 2-4a, and the two side walls 2-4a are arranged on both sides of the exhaust port 2-01a. The mounting bracket 4-02 has a corresponding slot 2-4b, and the side wall 2-4a is inserted into the slot 2-4b to form a staggered. The arc extinguishing chamber shell 2-01 forms a matching boss 2-4c, and the boss 2-4c is located between the two side walls 2-4a. A first protrusion 2-4d is formed on the mounting bracket 4-02, and the boss 2-4c is located on the inner side of the first protrusion 2-4d and forms an interlaced shape.

[0033] The arc extinguishing chamber 2-00 has an arc extinguishing grid 2-02 and an air flow channel 2-03. There are at least two arc extinguishing grids 2-02, which are arranged in sequence. In this embodiment, the number of arc extinguishing grids 2-02 is 11. A gap 2-04 is formed between each two connected arc extinguishing grids 2-02, and the gap 2-04 is connected to the exhaust port 2-01a through the air flow channel 2-03. That is, the gas flows from the gap 2-04 into the air flow channel 2-03, and then is ejected from the exhaust port 2-01a to the armature 4-01.

[0034] There are many ways to form the airflow channel here, which can be formed directly through the arc extinguishing chamber shell 2-01, or by relying on the arc extinguishing chamber shell 2-01 and the cover plate 1-02 of the outer shell 1-00. As a more compact solution, the arc extinguishing chamber shell 2-01 and the cover plate 1-02 are formed together here, which makes the entire product more compact and helps to reduce the volume of the product.

[0035] Regardless of the forming method of the air flow channel, for the exhaust port 2-01a, the diameter of the exhaust port 2-01a gradually decreases from the position close to the air flow channel 2-03 to the position close to the air inlet 4-02a, forming a Laval nozzle 2-01a'. Such a Laval nozzle 2-01a' will facilitate airflow convergence, increase the airflow speed blowing to the armature 4-01, and be more conducive to the armature 4-01 under the action of the airflow to promote the locking structure 5-04 to unlock.

[0036] In order to facilitate the assembly of the arc extinguishing chamber 2-00, the arc extinguishing chamber shell 2-01 includes a first bracket 2-06 and an upper cover 2-05. The arc extinguishing grid 2-02 is arranged with the first bracket 2-06 by snapping, and the protrusion formed on the arc extinguishing grid 2-02 is snapped into the slot of the first bracket 2-06 for snapping. The airflow channel 2-03 is located on the first bracket 2-06. One side of the first bracket 2-06 has an open part 2-06a, and the open part 2-06a is connected to the airflow channel 2-03. The upper cover 2-05 has a shielding part 2-05b, and the shielding part 2-05b shields part of the open part 2-06a to form an exhaust port 2-01a. Such a structure divides the arc extinguishing chamber 2-00 into multiple components, which is not only conducive to the injection molding of the first bracket 2-06 and the upper cover 2-05 structure, but also conducive to the assembly of the arc extinguishing grid 2-02 and the molding of the exhaust port 2-01a. As for the fixing method of the upper cover 2-05 and the first bracket 2-06, the upper cover 2-05 and the first bracket 2-06 can be plugged in, snapped in, or fastened with screws, or even fixed with the upper cover 2-05, the first bracket 2-06 and the outer shell 1-00. No matter which method is used, as long as the upper cover 2-05 and the first bracket 2-06 can be stably placed in the outer shell 1-00, it will be fine.

[0037] As for the electromagnetic release 4-00, it is used to realize the general overcurrent protection function, which includes overload protection and short circuit protection. Therefore, the electromagnetic release 4-00 can adopt a thermal magnetic release or a hydraulic electromagnetic release 4-00.

[0038] Taking the hydraulic electromagnetic release 4-00 as an example, it includes a solenoid 4-03, an oil cup 4-04, an iron core, an iron core reset spring, an armature 4-01 and an armature reset spring 4-05. The oil cup 4-04 contains oil (such as silicone oil), an iron core and an iron core reset spring. The solenoid 4-03 surrounds the outside of the oil cup 4-04, and the solenoid 4-03 is a part of the main circuit conductor (meaning connected to the line to be protected). One end of the oil cup 4-04 is a pole shoe 4-06, and the armature 4-01 is a rotating setting (rotating setting with the yoke 4-07). The yoke 4-07 is set around the solenoid 4-03 and other components. One end of the armature reset spring 4-05 is connected to the yoke 4-07, and the other end is connected to the armature 4-01. When the main circuit is overloaded or short-circuited, the iron core moves toward the pole shoe 4-06 (the iron core reset spring stretches), the pole shoe 4-06 attracts the armature 4-01 to slide linearly (the armature reset spring 4-05 deforms), and the armature 4-01 triggers the first drive unit 5-08d, causing the operating mechanism 5-00 to trip. Subsequently, the armature reset spring 4-05 drives the armature 4-01 to reset, and the iron core reset spring drives the iron core to reset. Of course, the armature 4-01 can also be changed to a rotating setting. This hydraulic electromagnetic release 4-00 has a relatively simple structural principle, occupies a small space volume, and is suitable for smaller spaces.

[0039] As for the thermal magnetic release, it has a bimetallic strip in addition to the armature 4-01. When a short circuit occurs, it is actuated by the armature 4-01, but in the thermal magnetic release, the component that attracts the armature 4-01 is a static iron core.

[0040] Regardless of which type of electromagnetic release 4-00 is used, it has an armature 4-01, so a solution of utilizing airflow to achieve rapid release can be adopted.

[0041] From the height direction F1 of the installation space 1-03, the locking structure 5-04 is located higher than the armature 4-01, and the armature 4-01 is located higher than the exhaust port 2-01a. The armature 4-01 is set to rotate, and the armature 4-01 drives the first driving part 5-08d to move in a pushing manner. This relative height relationship combined with the way the airflow pushes the armature 4-01 makes the structure more streamlined compared to other movement methods.

[0042] As a more preferred operating mechanism 5-00, it includes a drive shaft 5-01, a transmission part 5-02, a transmission handle 5-03, a locking structure 5-04, a moving contact 3-01 and a main spring 5-05.

[0043] Except for the driving shaft 5-01, the remaining parts of the operating mechanism 5-00 are located in the installation space 1-03.

[0044] Drive shaft 5-01, the first end of drive shaft 5-01 is exposed outside housing 1-00 for operation, and the second end is in installation space 1-03. Here, drive shaft 5-01 is arranged to rotate with housing 1-00 around first axis O1 (that is, its rotation center), and first axis O1 is parallel to height direction F1. An insert nut is embedded in housing 1-00, drive shaft 5-01 passes through insert nut, the first end is exposed outside housing 1-00, and the other end is in installation space 1-03. Such insert nut design will help improve the sealing performance at drive shaft 5-01.

[0045] Transmission part 5-02, the transmission part 5-02 forms synchronous motion with the second end of the drive shaft 5-01, and the position of the transmission part 5-02 deviates from the first axis O1. Here, the transmission part 5-02 is a shaft, and the transmission part 5-02 is fixed on the fixing plate 5-06, and the fixing plate 5-06 is fixed on the second end of the drive shaft 5-01. The transmission part 5-02 here makes eccentric motion with respect to the first axis O1. The transmission part 5-02 here is inserted into the hole of the transmission handle 5-03, so that the drive shaft 5-01 drives the transmission handle 5-03 to rotate. Of course, the transmission part 5-02 and the fixing plate 5-06 here can be an integrally formed component. In addition to the shaft, the transmission part 5-02 here can also be changed into a shift fork, and the shift fork is arranged on the outside of the transmission handle 5-03, so that the drive shaft 5-01 drives the transmission handle 5-03 to rotate.

[0046] The transmission handle 5-03 is arranged to rotate with the housing 1-00 around the second axis O2 (that is, its rotation center). The rotation here can be formed by an independent hinged shaft or by an integrally formed shaft on the transmission handle 5-03. The second axis O2 here is parallel to the width direction F2, and the transmission handle 5-03 and the transmission part 5-02 form a linkage. From the height direction F1, the linkage position is located above the second axis O2. In this way, when the drive shaft 5-01 rotates with the first axis O1, the transmission part 5-02 can drive the transmission handle 5-03 to rotate with the second axis O2; when the transmission handle 5-03 rotates with the second axis O2, the transmission part 5-02 can drive the drive shaft 5-01 to rotate with the first axis O1. The transmission handle 5-03 here has three positions, namely, the closing position ON, the opening position OF, and the tripping position TP, which correspond to the closing state, the opening state, and the tripping state of the operating mechanism 5-00, respectively.

[0047] Moving contact 3-01, one end of the moving contact 3-01 is hinged to the transmission handle 5-03, and the other end is a moving contact (cooperating with the static contact). The axis of the hinge O4 of the moving contact 3-01 is parallel to the width direction F2, and the hinge O4 rotates with the transmission handle 5-03. That is to say, when the transmission handle 5-03 rotates with the second axis O2, the position of the hinge O4 will also change (following the change of the transmission handle 5-03). No matter where the hinge O4 is located, in the height direction F1, the hinge O4 is always between the second axis O2 and the third axis O3.

[0048] The locking structure 5-04 includes a first locking member 5-07, a second locking member 5-08, a third locking member 5-09 and a locking member return spring 5-10.

[0049] The first locking member 5-07 is arranged to rotate with the housing 1-00 around the third axis O3 (i.e., its rotation center). The rotation here can be formed by an independent hinge shaft or by a shaft portion integrally formed on the first locking member 5-07. The third axis O3 is parallel to the width direction F2, and the first locking member 5-07 includes a first overlap portion 5-07a and a reset portion 5-07b.

[0050] The second locking member 5-08 is rotatably arranged relative to the housing 1-00 about the fifth axis O5 (that is, its rotation center). The second locking member 5-08 has a second overlapping portion 5-08a and a third overlapping portion 5-08b.

[0051] The third locking member 5-09 (that is, its rotation center) is arranged to rotate relative to the housing 1-00 about the sixth axis O6. The third locking member 5-09 has a fourth overlapping portion 5-09a.

[0052] The second axis O2, the third axis O3, the axis of the hinge O4, the fifth axis O5, and the sixth axis O6 are all parallel to the width direction F2.

[0053] In the height direction F1, the fifth axis O5 is higher than the sixth axis O6, the first overlap portion 5-07a and the second overlap portion 5-08a are both located between the fifth axis O5 and the sixth axis O6, and the third overlap portion 5-08b and the fourth overlap portion 5-09a are both located below the second overlap portion 5-08a. When the locking structure 5-04 is locked, the first overlap portion 5-07a abuts against the second overlap portion 5-08a, and the third overlap portion 5-08b abuts against the fourth overlap portion 5-09a. After the locking structure 5-04 is unlocked, the first overlap portion 5-07a and the second overlap portion 5-08a are released from abutment, the third overlap portion 5-08b and the fourth overlap portion 5-09a are released from abutment, the first locking member 5-07 blocks the second locking member 5-08 on one side to prevent the locking structure 5-04 from changing to a locked state, and the locking member reset spring 5-10 is in an energy storage state, providing a spring force for the locking structure 5-04 to change to a locked state. The first overlap portion 5-07a and the second overlap portion 5-08a above are both convex, the third overlap portion 5-08 is a plane, and the fourth overlap portion 5-09a is a convex.

[0054] The locking member return spring 5-10 is connected between the second locking member 5-08 and the third locking member 5-09 to provide a biasing force when the locking structure 5-04 is transformed to a locked state.

[0055] After the locking structure 5-04 is unlocked, the reset part 5-07b is located on the side of the transmission handle 5-03 moving in the opening direction. When the transmission handle 5-03 is in the tripping position TP, the transmission handle 5-03 is driven to move to the opening position OF (actually, the drive shaft 5-01 rotates due to the external driving force, causing the transmission handle 5-03 to move). The transmission handle 5-03 can push the reset part 5-07b to rotate the first locking member 5-07, so that the first lap part 5-07a can release the obstruction to the second locking member 5-08. Under the joint action of the locking member reset spring 5-10 and the transmission handle 5-03, the locking structure 5-04 is re-locked. Here, the re-locking can be re-formed when the transmission handle 5-03 reaches the opening position OF, or it can be re-formed when the transmission handle 5-03 is about to reach the opening position OF.

[0056] Such a structure forms locking or unlocking by forming abutment or releasing abutment (it can also be said to be overlapping or releasing overlapping) between the above-mentioned locking parts, and has the characteristic of simple locking structure 5-04.

[0057] The main spring 5-05 is connected between the moving contact 3-01 and the first locking piece 5-07 to provide spring force for realizing the state switching of the operating mechanism 5-00. Here, one end of the main spring 5-05 is suspended on the bent part of the moving contact 3-01, and the other end is suspended on an axis on the first locking piece 5-07. When the circuit breaker is in the closed state, the main spring 5-05 is in an energy storage state. Due to the locking of the locking structure 5-04, the operating mechanism 5-00 maintains a steady state. When the locking structure 5-04 is driven to unlock, the steady state is broken, and the operating mechanism 5-00 switches to the tripping state under the action of the main spring 5-05. The main spring 5-05 here can achieve the effect of quickly switching between the open and closed states. When the operating mechanism 5-00 is in the closed state (at this time, the locking structure 5-04 and the first overlap portion 5-07a are locked), the external force causes the drive shaft 5-01 to rotate in the opening direction. Since the hinge O4 between the transmission handle 5-03 and the moving contact 3-01 is changing (as the transmission handle 5-03 rotates), the main spring 5-05 gradually deforms and crosses the critical point (also called the dead point). After crossing the critical point, the main spring 5-05 accelerates the rotation of the moving contact 3-01 and the transmission handle 5-03, so that the operating mechanism 5-00 quickly reaches the opening state (the moving contact 3-01 and the static contact 3-02 are completely separated). Similarly, when the operating mechanism 5-00 is in the open state (at this time, the locking structure 5-04 and the first overlap portion 5-07a are also locked), the external force causes the drive shaft 5-01 to rotate in the closing direction. Since the hinge O4 between the transmission handle 5-03 and the moving contact 3-01 is changing (as the transmission handle 5-03 rotates), the main spring 5-05 gradually deforms and crosses the critical point (also called the dead point). After crossing the critical point, the main spring 5-05 accelerates the rotation of the moving contact 3-01 and the transmission handle 5-03, so that the operating mechanism 5-00 quickly reaches the closed state (the moving contact 3-01 contacts the static contact 3-02). In order to prevent the main spring 5-05 from being burned by the arc, an insulating sleeve 5-050 is also provided on the main spring 5-05.

[0058] Such an operating mechanism 5-00 has three states, and can remind the user through the tripping state that the tripping structure of the circuit breaker is tripped due to a line fault. Moreover, such an operating mechanism 5-00 has almost all its components in the installation space 1-03 (even the first end of the drive shaft 5-01 is not there), which is very suitable for use in explosion-proof circuit breakers.

[0059] As a more preferred method, the locking member reset spring 5-10 adopts a compression spring, which includes a first abutting end and a second abutting end, the first abutting end abuts against the second locking member 5-08, the second abutting end abuts against the second locking member 5-08, and the first abutting end and the second abutting end are always located below the sixth axis O6. Of course, as an alternative, the locking member reset spring 5-10 can also adopt a spring sheet or a torsion spring, which also has a first abutting end and a second abutting end. This method in which the first abutting end and the second abutting end are always located below the sixth axis O6 will help push the second locking member 5-08 to reset (that is, re-lock).

[0060] Similarly, the second locking member 5-08 has a first spring mounting portion 5-08c, the third locking member 5-09 has a second spring mounting portion 5-09b, and the two ends of the locking member reset spring 5-10 are respectively connected to the first spring mounting portion 5-08c and the second spring mounting portion 5-09b. The first spring mounting portion 5-08c and the second spring mounting portion 5-09b are provided in different forms according to the specific types of springs, as long as the two abutting ends of the locking member reset spring 5-10 can be limited. For example, when it is a compression spring, the first spring mounting portion 5-08c and the second spring mounting portion 5-09b adopt the method of a positioning column. For example, when it is a torsion spring or a spring sheet, it is a protrusion with a limiting groove, and the limiting groove will be conducive to the stable installation of the torsion spring and the spring sheet.

[0061] Here, the second locking member 5-08 and the third locking member 5-09 are rotatably arranged on the mounting bracket 4-02, and the mounting bracket 4-02 is arranged in the mounting space 1-03. Specifically, the second locking member 5-08 has a fifth rotating shaft (whose axis is the fifth axis O5), which is rotatably arranged on the mounting bracket 4-02 through the fifth rotating shaft, so as to rotate relative to the housing 1-00. The third locking member 5-09 has a sixth rotating shaft (whose axis is the sixth axis O6), which is rotatably arranged on the mounting bracket 4-02 through the sixth rotating shaft, so as to rotate relative to the housing 1-00. Of course, the fifth rotating shaft and the sixth rotating shaft mentioned above can be either an independent shaft or a cylindrical protrusion directly formed on the second locking member 5-08 and the third locking member 5-09. The mounting bracket 4-02 here is also used to install the electromagnetic release 4-00. After the electromagnetic release 4-00, the second locking piece 5-08, the third locking piece 5-09 and the mounting bracket 4-02 are assembled, the mounting bracket 4-02 is installed into the installation space 1-03, which can realize modular assembly and is conducive to product assembly.

[0062] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0063] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A tripping structure of a circuit breaker, characterized in that: The invention comprises a housing and an operating mechanism; the housing has an installation space, and the operating mechanism is arranged in the installation space; the operating mechanism comprises a locking structure, and when the circuit breaker is in the closed state, the locking structure is locked to keep the operating mechanism in the closed state; after the locking structure is unlocked, the operating mechanism realizes a tripping operation, prompting the circuit breaker to be disconnected; The installation space is divided into at least one subspace, and an arc extinguishing chamber, a contact system and an electromagnetic release are arranged in at least one subspace; the arc extinguishing chamber is used to extinguish the arc generated when the contact system is separated; The electromagnetic release has an armature that is rotatably arranged, and the locking structure has a first driving part corresponding to the armature; the arc extinguishing chamber has an exhaust port, and the armature is located at the exhaust port; When current exists in the circuit, the attraction force on the armature and the air blowing force from the exhaust port are superimposed on each other, and together cause the armature to rotate and trigger the first driving part, causing the locking structure to unlock.

2. A tripping structure of a circuit breaker according to claim 1, characterized in that: The arc extinguishing chamber also includes an arc extinguishing chamber shell, and an exhaust port is arranged on the arc extinguishing chamber shell; it also includes a mounting bracket, and the electromagnetic release is fixed on the mounting bracket and placed in the subspace through the mounting bracket; the mounting bracket has an air inlet at the armature mounting position, and the exhaust port is aligned with the air inlet.

3. A tripping structure of a circuit breaker according to claim 2, characterized in that: The arc extinguishing chamber shell and the mounting bracket form a staggered structure, and the staggered structure is arranged around the junction of the air inlet and the exhaust port to improve the air tightness of the air inlet and the exhaust port.

4. A tripping structure of a circuit breaker according to claim 2, characterized in that: The arc extinguishing chamber also includes at least two arc extinguishing grids and an air flow channel; there is a gap between two adjacent arc extinguishing grids, the gap is connected to the exhaust port through the air flow channel, the gas generated during the disconnection flows into the air flow channel from the gap, and then is sprayed toward the armature from the exhaust port; the diameter of the exhaust port gradually decreases from close to the air flow channel to close to the air inlet, forming a Laval nozzle.

5. The tripping structure of a circuit breaker according to claim 2, characterized in that: The outer shell includes a cover shell and a sealing plate, the installation space is set on the cover shell, the bottom of the cover shell has an installation opening of the installation space, and the sealing plate is used to close the installation opening; the arc extinguishing chamber also includes at least two arc extinguishing grids, and there is a gap between two adjacent arc extinguishing grids; the arc extinguishing chamber shell and the sealing plate jointly form an air flow channel, the gap is connected to the exhaust port through the air flow channel, and the gas generated during the disconnection flows into the air flow channel from the gap, and then is sprayed toward the armature from the exhaust port.

6. A tripping structure of a circuit breaker according to claim 4 or 5, characterized in that: The arc extinguishing chamber shell includes a first bracket and an upper cover, the arc extinguishing grid is clamped on the first bracket, and the airflow channel is on the first bracket; the first bracket has an open part connected to the airflow channel, and the upper cover has a shielding part, which shields part of the open part to form an exhaust port.

7. The tripping structure of a circuit breaker according to claim 1, characterized in that: The locking structure includes a first locking piece, a second locking piece, a third locking piece and a locking piece return spring; the first locking piece, the second locking piece and the third locking piece are all rotatably arranged, and from the height direction of the installation space, the rotation center of the second locking piece is higher than the rotation center of the third locking piece; the first locking piece includes a first overlapping portion, the second locking piece includes a second overlapping portion and a third overlapping portion, and the third locking piece includes a fourth overlapping portion; from the height direction of the installation space, the first overlapping portion and the second overlapping portion are both located between the rotation center of the second locking piece and the rotation center of the third locking piece, and are higher than the first overlapping portion. three overlapping parts and a fourth overlapping part; when the locking structure is locked, the first overlapping part and the second overlapping part, the third overlapping part and the fourth overlapping part form abutment, and after the locking structure is unlocked, the first overlapping part and the second overlapping part, the third overlapping part and the fourth overlapping part are released from abutment; the first driving part is arranged on the second locking member, and the first driving part is driven by the armature to rotate the second locking member to realize unlocking of the locking structure; the locking member reset spring abuts between the second locking member and the third locking member, and after the locking structure is unlocked, the first locking member blocks one side of the second locking member to limit the resetting of the locking structure, and the locking member reset spring is in an energy storage state.

8. The tripping structure of a circuit breaker according to claim 7, characterized in that: The operating mechanism also includes a driving shaft and a transmission part, a transmission handle, a moving contact, and a main spring in the installation space; the first end of the driving shaft passes through the shell, and the second end is in the installation space, and the driving shaft and the shell are rotatably arranged; the transmission part and the second end of the driving shaft form synchronous movement, and the transmission part deviates from the rotation center of the driving shaft; the transmission handle is rotatably arranged and is in a linkage relationship with the transmission part; one end of the moving contact is hinged to the transmission handle, and the hinge rotates with the transmission handle; the main spring is connected between the moving contact and the first locking member to provide spring force for realizing the state switching of the operating mechanism; when the circuit breaker is in the closed state, the main spring is in the energy storage state, and the operating mechanism maintains a steady state due to the locking of the locking structure, and the steady state is broken after the locking structure is unlocked. The operating mechanism is switched to the tripping state under the action of the main spring; the rotation center of the transmission handle, the rotation center of the first locking piece, and the hinge of the moving contact are all arranged in parallel and perpendicular to the rotation center of the drive shaft; in the height direction, the rotation center of the transmission handle is higher than the rotation center of the first locking piece, and the hinge is always located between the rotation center of the transmission handle and the rotation center of the first locking piece during the rotation of the transmission handle; the first locking piece also includes a reset part, which is located on the side of the transmission handle moving in the opening direction. When the operating mechanism is in the tripping state, the transmission handle is driven to move in the opening direction, and the transmission handle pushes the reset part to rotate the first locking piece. Under the joint action of the transmission handle and the reset spring of the locking piece, the locking structure is locked.

9. A tripping structure of a circuit breaker according to claim 7 or 8, characterized in that: It also includes a mounting bracket, on which the second locking piece, the third locking piece, and the electromagnetic release are all fixed and installed in the housing through the mounting bracket; the first locking piece is rotatably connected to the wall of the mounting space, and the second locking piece and the third locking piece are rotatably connected to the mounting bracket.

10. The tripping structure of a circuit breaker according to claim 1, characterized in that: From the height direction of the installation space, the position of the locking structure is higher than the armature, and the position of the armature is higher than the exhaust port, and the armature drives the first driving part to move in a pushing manner; Alternatively, the electromagnetic release is a thermal-magnetic electromagnetic release or a hydraulic electromagnetic release.

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