Explosion-proof circuit breaker

Abstract

The utility model discloses an explosion-proof circuit breaker, which comprises a shell and a sealing plate, the shell is of a hexahedron structure and internally provided with a containing cavity, the bottom face of the shell is provided with an assembling opening of the containing cavity, and the sealing plate and the shell are fixed to be used for sealing the assembling opening. The circuit breaker also comprises an operating mechanism, an arc extinguishing cover and a contact assembly. The operating mechanism, the arc extinguishing cover and the contact assembly are installed in the accommodating cavity through the assembling port. The explosion-proof circuit breaker is an integrated explosion-proof circuit breaker and has the advantage of being better in performance.

Description

Technical Field

[0001] The present application relates to the field of low-voltage switchgear, and in particular to an explosion-proof circuit breaker. Background Art

[0002] For some special fields, explosion-proof circuit breakers will be needed. The common method of explosion-proof circuit breakers is to insert the existing small circuit breaker into the explosion-proof cover to form an explosion-proof circuit breaker.

[0003] However, the performance of this explosion-proof circuit breaker is actually equivalent to that of the small circuit breaker itself. Even with a larger explosion-proof cover, its performance in all aspects has not been improved and is still limited by the small circuit breaker itself.

[0004] Therefore, how to design an integrated explosion-proof circuit breaker so that the circuit breaker has better performance is a research direction. Summary of the Invention

[0005] In view of this, the purpose of this application is to overcome the deficiencies in the prior art and to provide an explosion-proof circuit breaker.

[0006] The present application provides: an explosion-proof circuit breaker, which includes a shell and a sealing plate; the shell is a hexahedral structure, has an accommodating cavity inside, has an assembly opening for the accommodating cavity on the bottom surface of the shell, and the sealing plate is fixed to the shell to close the assembly opening; also includes an operating mechanism, an arc extinguishing hood and a contact assembly, and the operating mechanism, arc extinguishing hood and contact assembly are installed in the accommodating cavity through the assembly opening.

[0007] In some embodiments of the present application, the accommodating cavity is provided with at least one electromagnetic release and a fixing bracket, the electromagnetic release is mounted on the fixing bracket, and the fixing bracket is mounted in the accommodating cavity through an assembly opening.

[0008] In some embodiments of the present application, the accommodating cavity has at least one electromagnetic release and a fixing bracket, the electromagnetic release and the locking assembly of the operating mechanism are installed on the fixing bracket, and the fixing bracket is installed in the accommodating cavity through the assembly opening.

[0009] In some embodiments of the present application, the electromagnetic release and the fixing bracket include one of the following structures:

[0010] Structure 1: The electromagnetic release includes an oil cup, a first slot and an elastic snap-on are provided on the fixed bracket, the openings of the first slot and the elastic snap-on are in the same direction, and the oil cup has a first clamping portion at one end of the pole shoe. When installed, the first clamping portion is aligned with the opening of the first slot, and the oil cup is pushed in so that the first clamping portion is clamped into the first slot and the elastic snap-on clamps the oil cup.

[0011] Structure 2: The electromagnetic release includes an oil cup and an armature. One end of the oil cup has a pole shoe. The armature is rotatably set in a fixed bracket. The oil cup is fixed on the fixed bracket. The fixed bracket has an active space corresponding to the pole shoe. The armature part is located in the active space.

[0012] Structure three, the electromagnetic release includes a magnetic yoke, a fixing bracket having a mounting slot and a second clamping slot, the mounting slot and the second clamping slot having the same opening direction, and the magnetic yoke having a second clamping portion. When installing, the second clamping portion is aligned with the opening of the second clamping slot, and the magnetic yoke is pushed in so that the magnetic yoke enters the mounting slot;

[0013] Structure 4: The electromagnetic release includes a magnetic yoke, a mounting groove is provided on the fixing bracket, the magnetic yoke is located in the mounting groove, and the mounting groove has a barb, which is engaged with the magnetic yoke to prevent the magnetic yoke from being separated from the mounting groove;

[0014] Structure 5, the electromagnetic release includes a yoke, a fixing bracket having a mounting groove, the yoke is located in the mounting groove, the mounting groove has a first positioning portion, the yoke has a second positioning portion, the first positioning portion and the second positioning portion form a positioning fit;

[0015] Structure six, the electromagnetic release includes a yoke, a fixing bracket has a mounting groove, the yoke is in the mounting groove, and the yoke and the fixing bracket are fastened by hot riveting to prevent the yoke from detaching from the mounting groove.

[0016] In some embodiments of the present application, a phase separation assembly is also included, which divides the accommodating chamber into at least two sub-chambers, and each sub-chamber is provided with an arc extinguishing cover and a contact assembly; the phase separation assembly includes a first partition and a second partition; the first partition and the outer shell are plugged and fixed or integrally formed, the second partition and the first partition are plugged and fixed or the second partition and the sealing plate are integrally formed or the second partition and the sealing plate are fastened by a fastening structure, and the first partition and the second partition cooperate with each other to separate the accommodating chamber.

[0017] In some embodiments of the present application, the operating mechanism includes a first rotating member that is rotatably arranged, and the first rotating member is rotatably arranged under the joint action of the first partition and the shell.

[0018] In some embodiments of the present application, the operating mechanism includes a second rotating member that is rotatably arranged, and the second rotating member forms a rotational arrangement under the joint action of the first partition and the shell.

[0019] In some embodiments of the present application, only one set of arc extinguishing covers and contact assemblies are provided in the accommodating cavity, and a first support member is provided on the sealing plate. The first support member and the sealing plate are integrally formed or fastened by a fastening structure; the operating mechanism includes a first rotating member and / or a second rotating member that is rotatably arranged, and the first rotating member and / or the second rotating member form a rotating arrangement under the joint action of the first support member and the outer shell.

[0020] In some embodiments of the present application, the contact assembly includes a static contact and a moving contact; the arc extinguishing hood is arranged close to the cover plate, and in the height direction of the circuit breaker, the arc extinguishing hood is located between the static contact and the cover plate; the length direction of the arc extinguishing hood is consistent with the length direction of the circuit breaker, and the arc extinguishing plates in the arc extinguishing hood are arranged in sequence along a straight line or along an arc in the length direction of the arc extinguishing hood.

[0021] In some embodiments of the present application, the arc extinguishing hood includes an arc extinguishing hood shell and an arc extinguishing plate, which is arranged on the arc extinguishing hood shell; the arc extinguishing hood shell has a first limiting portion, and the wall of the accommodating cavity has a second limiting portion that is adapted to the shape of the first limiting portion, and the second limiting portion extends to the assembly port. When the arc extinguishing hood shell is installed, the first limiting portion is aligned with the second limiting portion and pushed into the accommodating cavity.

[0022] In some embodiments of the present application, the contact assembly includes a static contact and a moving contact, the static contact has a first mounting portion, and the wall of the accommodating cavity has a third limiting portion that matches the shape of the first mounting portion. The third limiting portion extends to the assembly port. When the static contact is installed, the first mounting portion is aligned with the third limiting portion to enter the accommodating cavity, and the first mounting portion is fastened in the accommodating cavity by screws.

[0023] In some embodiments of the present application, the contact assembly includes a static contact and a moving contact, and the accommodating cavity also has a fixed plate corresponding to the moving contact, the fixed plate is electrically connected to the moving contact, and the fixed plate has a second mounting portion, and the wall of the accommodating cavity has a fourth limiting portion that matches the shape of the second mounting portion, and the fourth limiting portion extends to the assembly port. When the fixed plate is installed, the second mounting portion is aligned with the fourth limiting portion to enter the accommodating cavity, and the second mounting portion is fastened in the accommodating cavity by screws.

[0024] In some embodiments of the present application, a cross structure is formed between the wall of the accommodating cavity and the sealing plate, and the cross structure surrounds the assembly opening.

[0025] In some embodiments of the present application, a glue filling structure is provided between the housing and the sealing plate, and the glue filling structure surrounds the assembly opening.

[0026] In some embodiments of the present application, the sealing plate is at least partially embedded in the bottom surface of the housing.

[0027] The beneficial effects of this application include:

[0028] First of all, it is equivalent to setting the contact assembly, arc extinguishing cover and operating mechanism of the circuit breaker directly in the casing. The casing and the cover plate are equivalent to the explosion-proof cover. Compared with the traditional circuit breaker formed by a small circuit breaker, such an explosion-proof circuit breaker undoubtedly has a larger space to design the contact assembly, arc extinguishing cover and operating mechanism, so that the design space of the contact assembly, arc extinguishing cover and operating mechanism is not limited by the small circuit breaker casing, and has more superior performance.

[0029] Secondly, the shell adopts a hexahedral structure, and the assembly port is sealed with a sealing plate, which can make the sealing performance of the entire shell better (because the traditional small circuit breaker has a shell structure spliced left and right, and the sealing performance is relatively poor).

[0030] Finally, an assembly opening is provided on the bottom surface of the housing so that the contact assembly, arc extinguishing cover and operating mechanism can be installed into the accommodating cavity through the assembly opening, which is very convenient for product assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. 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 relevant drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 A rear-view stereoscopic view of the explosion-proof circuit breaker according to Example 1 of the present application is shown;

[0033] Figure 2 An exploded view from the rear direction of the explosion-proof circuit breaker of Example 1 of the present application is shown;

[0034] Figure 3 An exploded view of the explosion-proof circuit breaker according to Example 1 of the present application is shown;

[0035] Figure 4 A schematic diagram of the sealing plate of Example 1 of the present application is shown;

[0036] Figure 5 A schematic diagram of the housing of Example 1 of the present application is shown;

[0037] Figure 6 A schematic diagram of an electromagnetic release and a fixing bracket according to Example 1 of the present application is shown;

[0038] Figure 7 A schematic diagram of an electromagnetic release according to embodiment 1 of the present application is shown;

[0039] Figure 8 A schematic diagram showing the electromagnetic release of embodiment 1 of the present application after actuation is shown;

[0040] Figure 9 A schematic diagram of the assembly of the oil cup and the mounting bracket of Example 1 of the present application is shown;

[0041] Figure 10 Schematic diagram of the assembly of the magnetic yoke and the mounting bracket of Example 1 of the present application is shown;

[0042] Figure 11 Schematic diagram of the assembly of the static contact, the fixing plate and the housing of Example 1 of the present application is shown;

[0043] Figure 12 A schematic diagram of the assembly of the arc extinguishing chamber and the housing in Example 1 of the present application is shown;

[0044] Figure 13 A schematic diagram of the operating mechanism of Example 1 of the present application is shown;

[0045] Figure 14 A schematic diagram showing the closing state of the operating mechanism in Example 1 of the present application is shown;

[0046] Figure 15 A schematic diagram showing the opening state of the operating mechanism of Example 1 of the present application is shown;

[0047] Figure 16 A schematic diagram showing the tripping state of the operating mechanism in Example 1 of the present application is shown;

[0048] Figure 17 A schematic diagram showing the locking structure of Example 1 of the present application in a locked state is shown;

[0049] Figure 18 A schematic diagram showing the unlocked locking structure of Example 1 of the present application is shown;

[0050] Figure 19 A schematic diagram showing the locking structure and the second rotating member when locked in Example 1 of the present application is shown;

[0051] Figure 20 A schematic diagram showing the second rotating member driving the locking structure to reset in Example 1 of the present application is shown;

[0052] Figure 21 A cross-sectional view of a single-pole circuit breaker according to embodiment 1 of the present application is shown. DETAILED DESCRIPTION

[0053] The following describes in detail embodiments of the present application. 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 are not to be construed as limiting the present application.

[0054] 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 device or element referred to 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.

[0055] Furthermore, the terms "primary" and "secondary" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features being referred to. Thus, a feature designated "primary" or "secondary" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0056] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium; internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0057] In this application, unless otherwise expressly specified or 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 that the main feature and the second feature are in indirect contact through an intermediate medium. Furthermore, when a main feature is "above," "above," or "above" a second feature, it can mean that the main feature is directly above or diagonally 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 diagonally below the second feature, or simply means that the main feature is lower in level than the second feature. Example

[0058] like Figure 1-21 As shown in the figure, an embodiment of the present application provides an explosion-proof circuit breaker, including the following structure:

[0059] The housing 100 is a hexahedral structure with a receiving cavity 101. The bottom surface 100a of the housing 100 has an assembly opening 101a for the receiving cavity 101. Components within the circuit breaker (such as the operating mechanism, arc extinguishing hood 400, electromagnetic trip unit 700, and contact assembly) can be placed into the receiving cavity 101 through the assembly opening 101a.

[0060] The sealing plate 200 is fixed to the housing 100 to close the assembly opening 101a. The sealing plate 200 and the housing 100 are fastened with screws, but riveting is also an option.

[0061] Here, after the sealing plate 200 and the housing 100 are assembled, they are at least partially embedded in the bottom surface 100a of the housing 100. Most preferably, the sealing plate 200 is flush with the bottom surface 100a. However, it is not excluded that the sealing plate 200 slightly protrudes from the bottom surface 100a or is slightly lower than the bottom surface 100a.

[0062] To improve sealing performance, the sealing plate 200 has a first annular protrusion 201, and the housing 100 has a second annular protrusion 102. The first annular protrusion 201 and the second annular protrusion 102 form a cross structure that surrounds the assembly opening 101a. Of course, although only the cross structure between the annular protrusions is shown here as an example, the cross structure can also be formed by the cooperation of an annular protrusion and an annular groove.

[0063] Here, because the second annular protrusion 102 surrounds the assembly opening 101a, a groove-shaped structure is formed on the side of the second annular protrusion 102 away from the assembly opening 101a. Glue can be poured into this groove-shaped structure to form a glue-filling structure. This glue is formed between the sealing plate 200 and the housing 100 (surrounding the assembly opening 101a), further improving the sealing performance. Of course, the groove-shaped structure required for the glue-filling structure here can also be formed without the second annular protrusion 102. For example, a groove-shaped structure for glue-filling can be provided separately on the housing 100.

[0064] The contact assembly includes a static contact 301 and a moving contact 302. The static contact 301 and the moving contact 302 have a contact state and a separation state. This transition between the release state and the separation state is achieved by an operating mechanism. The static contact 301 has a first mounting portion 301a, and a third limiting portion 1013 is formed on the wall of the accommodating chamber 101. The first mounting portion 301a and the third limiting portion 1013 are adapted in shape. The third limiting portion 1013 extends all the way to the assembly opening 101a. When installing, the static contact 301 is aligned with the third limiting portion 1013 through the first mounting portion 301a and enters the accommodating chamber 101. It is then fastened with screws. Here, the screws can be fastened to the wall of the accommodating chamber 101 or to the insert nut in the wall of the accommodating chamber 101. In this way, a limiting effect is formed on the installation of the static contact 301, which can prevent the static contact 301 from being installed incorrectly. At the same time, such limiting is also conducive to the rapid assembly of the static contact 301.

[0065] The movable contact 302 includes a fixing plate 303, which is electrically connected to the movable contact 302. In this embodiment, the movable contact 302 is welded to the first conductor via a flexible connector, the first conductor is welded to the solenoid 701, and the solenoid 701 is welded to the fixing plate 303 to form an electrically conductive connection. This number of components is not necessarily required; for example, the first conductor can be omitted, and the solenoid 701 and the movable contact 302 can be directly welded via a flexible connector.

[0066] The fixing plate 303 has a second mounting portion 303a, and a fourth limiting portion 1014 is formed on the wall of the accommodating chamber 101. The second mounting portion 303a matches the shape of the fourth limiting portion 1014. The fourth limiting portion 1014 extends all the way to the assembly opening 101a. During installation, the fixing plate 303 is aligned with the fourth limiting portion 1014 through the second mounting portion 303a and inserted into the accommodating chamber 101. The fixing plate 303 is then secured with screws, which can be fastened to the wall of the accommodating chamber 101 or to insert nuts in the wall of the accommodating chamber 101. This creates a limiting effect on the installation of the fixing plate 303, preventing incorrect installation of the fixing plate 303. This limiting effect also facilitates quick assembly of the fixing plate 303.

[0067] The arc extinguishing hood 400 is used to be arranged near the moving and static contacts 301 and 302 to extinguish the arc generated when the moving and static contacts 301 and 302 separate. The arc extinguishing hood 400 here includes an arc extinguishing hood shell 402, and the arc extinguishing plate 401 is fixed to the arc extinguishing hood shell 402. The arc extinguishing hood shell 402 has a first limiting portion 402a, and the wall of the accommodating cavity 101 has a second limiting portion 1012, the shape of the second limiting portion 1012 being adapted to the first limiting portion 402a. The second limiting portion 1012 extends to the assembly opening 101a. In this way, when the arc extinguishing hood shell 402 is assembled, it enters the accommodating cavity 101 through the first limiting portion 402a and aligns with the second limiting portion 1012 until it reaches the installation position. This limiting structure provides a limiting effect on the installation of the arc chute housing 402, preventing incorrect installation of the arc chute housing 402. This limiting structure also facilitates rapid assembly of the arc chute housing 402. Here, the arc chute housing 402 is not necessarily a single piece; it can also be an assembly composed of multiple sub-components. The second limiting portion 1012 and the third limiting portion 1013 are identical, which makes the structure more compact.

[0068] As for the arc extinguishing hood 400, from the height of the circuit breaker, it is positioned below the static contact 301 and above the cover plate 200. In other words, the arc extinguishing hood 400 is located between the static contact 301 and the cover plate 200. The length of the arc extinguishing hood here coincides with the length of the circuit breaker, and the arc extinguishing blades 401 are arranged in a straight line along the length of the arc extinguishing hood 400. Alternatively, the arc extinguishing blades 401 can also be arranged in an arc.

[0069] The operating mechanism includes a driving shaft 601 , a driving portion 602 , a second rotating member 603 , a first rotating member 604 , a locking assembly 605 , a moving contact 302 and a spring 606 .

[0070] The housing 100 has a receiving cavity 101 , and all components of the operating mechanism except the driving shaft 601 are located in the receiving cavity 101 .

[0071] The drive shaft 601 has a first end exposed outside the housing 100 for operation, and a second end located within the accommodating cavity 101. The drive shaft 601 is rotatable relative to the housing 100 about a first axis S1, which is parallel to the height direction H. An insert nut is embedded in the housing 100, through which the drive shaft 601 extends, with the first end exposed outside the housing 100 and the other end located within the accommodating cavity 101. This insert nut design improves the sealing performance of the drive shaft 601, making it more suitable for explosion-proof circuit breakers.

[0072] Here, the first end of the drive shaft 601 is used for external operation.

[0073] The driving part 602 forms a synchronous motion with the second end of the driving shaft 601, and the position of the driving part 602 deviates from the first axis S1. Here, the driving part 602 is a shaft, and the driving part 602 is fixed on the mounting plate 607, and the mounting plate 607 is fixed on the second end of the driving shaft 601. The driving part 602 here makes an eccentric motion with respect to the first axis S1. The driving part 602 here is inserted into the hole of the second rotating member 603, so that the driving shaft 601 drives the second rotating member 603 to rotate. Of course, the driving part 602 and the mounting plate 607 here can be an integrally formed component. In addition to the shaft, the driving part 602 here can also be changed to a shift fork, which is sleeved on the outside of the second rotating member 603, so that the driving shaft 601 drives the second rotating member 603 to rotate.

[0074] The second rotating member 603 is rotatably arranged with the housing 100 around the second axis S2. The second axis S2 here is parallel to the width direction D. The second rotating member 603 forms a linkage with the driving part 602. From the height direction H, the linkage position is located above the second axis S2. In this way, when the drive shaft 601 rotates about the first axis S1, the driving part 602 can drive the second rotating member 603 to rotate about the second axis S2; when the second rotating member 603 rotates about the second axis S2, the driving part 602 can drive the drive shaft 601 to rotate about the first axis S1. The second rotating member 603 here has three positions, namely the closing position C1, the opening position C2 and the tripping position C3, which correspond to the closing state, the opening state and the tripping state of the operating mechanism respectively.

[0075] The movable contact 302 has one end hinged to the second rotating member 603, and the other end serves as a movable contact point (mates with the stationary contact 301). The axis of the hinge S4 of the movable contact 302 is parallel to the width direction D, and the hinge S4 rotates with the second rotating member 603. In other words, as the second rotating member 603 rotates about the second axis S2, the position of the hinge S4 also changes (following the movement of the second rotating member 603). Regardless of the position of the hinge S4, in the height direction H, the hinge S4 is always located between the second axis S2 and the third axis S3.

[0076] The first rotating member 604 is rotatably mounted relative to the housing 100 about a third axis S3. The third axis S3 is parallel to the width direction D. The first rotating member 604 includes a first locking portion 604a and a reset portion 604b. The first locking portion 604a is used to lock or unlock the latch assembly 605. The reset portion 604b is used to reset the latch assembly 605 (returning it to the locked state). Specifically, the reset portion 604b is located on the side of the second rotating member 603 that moves toward the tripping position. When the second rotating member 603 is in the trip position C3, after driving the second rotating member 603 toward the tripping position C2 (actually, by rotating the drive shaft 601, causing the second rotating member 603 to move), the second rotating member 603 pushes the reset portion 604b, causing the first rotating member 604 to rotate, thereby relocking the first locking portion 604a with the latch assembly 605. Here, the locking may be re-established just when the second rotating member 603 reaches the opening position C2 ; or the locking may be re-established when the second rotating member 603 is about to reach the opening position C2 .

[0077] The locking assembly 605 includes a first locking member 6051, a second locking member 6052, and a locking spring 6053. Here, the first locking member 6051 is rotatably disposed relative to the housing 100 about a fifth axis S5, and the second locking member 6052 is rotatably disposed relative to the housing 100 about a sixth axis S6. Both the fifth axis S5 and the sixth axis S6 are parallel to the width direction D.

[0078] The first locking member 6051 has a second locking portion 605a and a third locking portion 605b, and the second locking member 6052 has a fourth locking portion 605c. In the height direction H, the fifth axis S5 is higher than the sixth axis S6. The first locking portion 604a and the second locking portion 605a are both located between the fifth axis S5 and the sixth axis S6, and the third locking portion 605b and the fourth locking portion 605c are both located below the second locking portion 605a. When the locking assembly 605 is in the locked state, the first locking portion 604a abuts the second locking portion 605a, and the third locking portion 605b abuts the fourth locking portion 605c. When the lock assembly 605 is in the unlocked state, the first locking portion 604a and the second locking portion 605a are released from contact, the third locking portion 605b and the fourth locking portion 605c are released from contact, the first rotating member 604 blocks the first locking member 6051, and prevents the lock assembly 605 from transitioning to the locked state. The lock spring 6053 is in a stored energy state, providing the spring force that enables the lock assembly 605 to transition to the locked state. The first locking portion 604a and the second locking portion 605a at the top are both raised, the third locking portion 605b is flat, and the fourth locking portion 605c is raised.

[0079] The locking spring 6053 is connected between the first locking member 6051 and the second locking member 6052 to provide a biasing force when the locking assembly 605 is transformed into a locked state.

[0080] This structure achieves locking or unlocking by forming abutments or releasing abutments (or overlapping or releasing overlaps) between the aforementioned locking portions, thus featuring a simple locking structure. The locking spring 6053 ensures that the return portion 604b drives the rotating member. When the rotating member gradually breaks free from the obstruction of the locking assembly 605, the locking spring 6053 causes the first locking member 6051 to rotate, causing the first locking portion 604a to abut against the second locking portion 605a, and the third locking portion 605b to abut against the fourth locking portion 605c (i.e., returning the locking assembly 605 to the locked state).

[0081] The first locking member 6051 has a relief portion 605d. Here, the relief portion 605d is a through hole, though it could also be a groove (sufficient to accommodate the fourth locking portion 605c). The relief portion 605d is designed so that when the locking assembly 605 is unlocked, the fourth locking portion 605c is positioned within the relief portion 605d. In the height direction H, the relief portion 605d is connected to the third locking portion 605b, facilitating movement of the fourth locking portion 605c (both allowing the fourth locking portion 605c to enter the relief portion 605d and release its contact with the third locking portion 605b, and also allowing the fourth locking portion 605c to move out of the relief portion 605d and contact the third locking portion 605b).

[0082] The locking spring 6053 is preferably a compression spring having a first abutting end and a second abutting end. The first abutting end abuts the first locking member 6051, and the second abutting end abuts the first locking member 6051. The first and second abutting ends are always located below the sixth axis S6. Alternatively, the locking spring 6053 can be a leaf spring or a torsion spring, similarly having a first abutting end and a second abutting end. This arrangement of the first and second abutting ends always being located below the sixth axis S6 facilitates the reset of the first locking member 6051 (i.e., re-locking).

[0083] Similarly, the first locking member 6051 has a first spring mounting portion 6051a, and the second locking member 6052 has a second spring mounting portion 6052a. The two ends of the locking spring 6053 are respectively connected to the first spring mounting portion 6051a and the second spring mounting portion 6052a. The first spring mounting portion 6051a and the second spring mounting portion 6052a are provided in different forms depending on the specific type of spring, as long as they can ensure that the two abutting ends of the locking spring 6053 are limited. For example, in the case of a compression spring, the first spring mounting portion 6051a and the second spring mounting portion 6052a are provided in the form of positioning posts. For example, in the case of a torsion spring or a spring leaf, the first spring mounting portion 6051a and the second spring mounting portion 6052a are provided in the form of projections with limiting grooves, which facilitate the stable installation of the torsion spring or the spring leaf.

[0084] Spring 606, connected between the moving contact 302 and the first rotating member 604, provides spring force to switch the operating mechanism. When the operating mechanism is in the closed state, spring 606 is in a stored energy state, and the operating mechanism maintains a steady state due to the locking action of the latch assembly 605 and the first locking portion 604a. When the latch assembly 605 is actuated, this steady state is broken, and the operating mechanism switches to the tripped state under the action of spring 606. Here, spring 606 facilitates rapid switching between the open and closed states. When the operating mechanism is in the closed state (at this time the lock assembly 605 and the first locking part 604a are locked), the external force causes the drive shaft 601 to rotate in the opening direction. Since the hinge S4 between the second rotating member 603 and the moving contact 302 is changing (as the second rotating member 603 rotates), the spring 606 gradually deforms and crosses the critical point (also called the dead point). After crossing the critical point, the spring 606 accelerates the rotation of the moving contact 302 and the second rotating member 603, so that the operating mechanism quickly reaches the opening state (the moving contact 302 and the static contact 301 are completely separated). Similarly, when the operating mechanism is in the open state (at which point the latch assembly 605 and the first locking portion 604a are also locked), an external force causes the drive shaft 601 to rotate in the closing direction. As the hinge S4 between the second rotating member 603 and the moving contact 302 changes (as the second rotating member 603 rotates), the spring 606 gradually deforms beyond a critical point (also called a dead point). After crossing the critical point, the spring 606 accelerates the rotation of the moving contact 302 and the second rotating member 603, rapidly bringing the operating mechanism to the closed state (where the moving contact 302 contacts the stationary contact 301). To protect the spring 606 from arc erosion, an insulating sleeve is provided.

[0085] For a single-pole circuit breaker, its accommodating chamber 101 contains only one arc extinguishing hood 400 and contact assembly. In this configuration, a first support member 501 is provided on the cover plate 200, and the first support member 501 and the cover plate 200 are integrally formed. Of course, the first support member 501 and the cover plate 200 can also be formed separately and then secured using methods such as snap-fitting or screw fastening.

[0086] The rotation of the first transmission member and the second transmission member is achieved through the combined action of the first support member 501 and the housing 100 .

[0087] Specifically, the first support member 501 is provided with a first arcuate groove S100 and a third arcuate groove S200, and the wall of the accommodating cavity 101 is provided with a second arcuate groove S300 and a fourth arcuate groove S400. The notches of the first arcuate groove S100 and the second arcuate groove S300 are completely opposite, and the notches of the third arcuate groove S200 and the fourth arcuate groove S400 are completely opposite. The second rotating member 603 has a portion that mates with the first arcuate groove S100 and a portion that mates with the second arcuate groove S300. The first rotating member 604 has a portion that mates with the third arcuate groove S200 and the fourth arcuate groove S400. A rotational connection is formed by the arcuate grooves and the mate portions. Of course, the mate portions here can be integrally formed on the first rotating member 604 and the second rotating member 603, or a separate pin can be used.

[0088] Such a rotating structure is simple to form and easy to assemble.

[0089] For a multi-pole circuit breaker, its accommodating chamber 101 has multiple sub-chambers 1010, each of which is separated by a phase-separating assembly. For example, a two-pole circuit breaker has one set of phase-separating assemblies, which divides the accommodating chamber 101 into two sub-chambers 1010. For example, a three-pole circuit breaker has two sets of phase-separating assemblies, which divide the accommodating chamber 101 into three sub-chambers 1010. For example, a four-pole circuit breaker has three sets of phase-separating assemblies, which divide the accommodating chamber 101 into four sub-chambers 1010. For multi-pole circuit breakers, each sub-chamber 1010 has an arc extinguishing hood 400 and a contact assembly.

[0090] The interphase partition assembly here includes a first partition 502 and a second partition 503. The first partition 502 is integrally formed with the housing 100, and the second partition 503 is fastened to the sealing plate 200 via a fastening structure. In this way, after the sealing plate 200 is assembled, the first partition 502 and the second partition 503 cooperate with each other to jointly separate the accommodating cavity 101. Here, the fastening of the second partition 503 to the sealing plate 200 is achieved by screws, of course, it can also be fixed by a snap-fit or interference fit. In addition, the first partition 502 can also be changed to a plug-in fit with the housing 100, the second partition 503 and the sealing plate 200 can also be changed to a structure integral with the sealing plate 200, and the second partition 503 can also be changed to a plug-in fit with the first partition 502 (in this method, the second partition 503 is first plugged into the first partition 502, and then the sealing plate 200 is fastened). The sealing plate 200 can also be changed to a structure integral with the sealing plate 200.

[0091] Such a phase partition assembly has a very simple structure and can easily partition the accommodating cavity 101 .

[0092] For this multi-pole circuit breaker structure, the rotation of the first rotating member 604 and the second rotating member 603 is achieved by the combined action of the second partition 503 and the housing 100 .

[0093] Specifically, the second partition 503 is provided with a first arcuate groove S100 and a third arcuate groove S200, the wall of the accommodating chamber 101 is provided with a second arcuate groove S300, and the first partition 502 is provided with a fourth arcuate groove S400. The notches of the first arcuate groove S100 and the second arcuate groove S300 are completely opposite, and the notches of the third arcuate groove S200 and the fourth arcuate groove S400 are completely opposite. The second rotating member 603 has a portion that fits with the first arcuate groove S100 and a portion that fits with the second arcuate groove S300. The first rotating member 604 has a portion that fits with the third arcuate groove S200 and the fourth arcuate groove S400. A rotational connection is formed by the arcuate grooves and the fitting portions. Of course, the fitting portions here can be integrally formed on the first rotating member 604 and the second rotating member 603, or a separate pin can be used.

[0094] Such a rotating structure is simple to form and easy to install.

[0095] Regardless of the number of poles, a circuit breaker has an electromagnetic release 700. The number of electromagnetic releases 700 varies depending on the number of poles. A single-pole circuit breaker has one electromagnetic release 700, a two-pole circuit breaker has two, a three-pole circuit breaker has three, and a four-pole circuit breaker has either three or four.

[0096] Regardless of the number of poles of the circuit breaker, the assembly method of its electromagnetic release 700 is similar. The following is an introduction using a 1-pole circuit breaker as an example. The structures of circuit breakers with other poles refer to the 1-pole circuit breaker.

[0097] The electromagnetic release 700 is mounted on the fixing bracket 800 and then installed in the accommodating cavity 101. In this way, the electromagnetic release 700 can be modularly installed through the fixing bracket 800.

[0098] Here, the locking assembly 605 of the operating mechanism is also fixed on the fixing bracket 800 and is installed in the accommodating cavity 101 through the fixing bracket 800. In this way, the locking assembly 605 of the operating mechanism and the electromagnetic release 700 can be modularly installed through the fixing bracket 800.

[0099] The electromagnetic release 700 is a hydraulic electromagnetic release and includes a solenoid 701, an oil cup 702, an iron core, an iron core return spring, an armature 703, and an armature return spring 704. The oil cup 702 contains oil (such as silicone oil), an iron core, and an iron core return spring. The solenoid 701 surrounds the oil cup 702 and serves as part of the main circuit conductor. One end of the oil cup 702 is connected to a pole piece 705, and the armature 703 is rotatable (rotating with a yoke 706). The yoke 706 is positioned around the solenoid 701 and other components. The armature return spring 704 is connected to the yoke 706 at one end and to the armature 703 at the other.

[0100] When the main circuit is overloaded or short-circuited, the iron core moves toward the pole shoe 705 (stretching the iron core return spring). This attracts the armature 703 to rotate (deforming the armature return spring 704). The armature 703 triggers the first triggering portion 6051b (on the first locking member), causing the operating mechanism to trip. Subsequently, the armature return spring 704 resets the armature 703, and the iron core return spring also resets the iron core. Of course, the armature 703 can also be rotated.

[0101] The fixing bracket 800 is provided with a first slot 801 and an elastic snap 802. The openings of the first slot 801 and the elastic snap 802 are oriented in the same direction. The end of the oil cup 702, which is provided with a pole shoe 705, has a first engaging portion 702a. During installation, the first engaging portion 702a is aligned with the opening of the first slot 801. The oil cup 702 is pushed in, causing the first engaging portion 702a to snap into the first slot 801 and the elastic snap 802 to lock the oil cup 702. The elastic snap 802 here refers to the elastic snap 802 having a movable arm on the fixing bracket 800. Since the fixing bracket 800 is made of plastic, when the oil cup 702 is pushed in, the movable arm deforms until the oil cup 702 is fully inserted into the elastic snap 802, securing the oil cup 702. This structure makes the attachment of the oil cup 702 very simple; it can be installed by simply pushing it in.

[0102] There is an active space 803 on the fixed bracket 800. This active space 803 is located near the pole shoe 705. The armature 703 is partially located in the active space 803. Such active space 803 can reserve enough space for the movement of the armature 703.

[0103] There is a mounting slot 804 and a second card slot 805 on the fixing bracket 800. The openings of the mounting slot 804 and the second card slot 805 are in the same direction. The yoke 706 has a second card portion 706a. During installation, the second card portion 706a is aligned with the opening of the second card slot 805, and the yoke 706 is pushed in so that the yoke 706 enters the mounting slot 804. This ensures that the yoke 706 is installed very easily.

[0104] A barb 806 is provided in the mounting groove 804, and the barb 806 engages with the yoke 706 to prevent the yoke 706 from being separated from the mounting groove 804. Such a structure can ensure that the yoke 706 is stably mounted.

[0105] A first positioning portion is provided within the mounting slot 804, and the yoke 706 has a second positioning portion 706b. The first positioning portion and the second positioning portion 706b form a positioning fit. The first positioning portion is a columnar structure, and the second positioning portion 706b is a through-hole. This positioning ensures that the yoke 706 is properly positioned. After installation, a portion of the first positioning portion can extend beyond the second positioning portion 706b. The excess portion is then heat-riveted to the yoke 706, preventing the yoke from falling out of the mounting slot 804.

[0106] For a plurality of electromagnetic releases 700 , their fixing brackets 800 are integrated, that is, one fixing bracket 800 is composed of a plurality of the above-mentioned fixing structures of the oil cup 702 and the magnetic yoke 706 , so that all electromagnetic releases 700 are fixed by one fixing bracket 800 .

[0107] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" 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 can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0108] 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. An explosion-proof circuit breaker, characterized in that: It includes a shell and a sealing plate; the shell is a hexahedral structure with an accommodating cavity inside, and an assembly opening for the accommodating cavity on the bottom surface of the shell. The sealing plate is fixed to the shell to close the assembly opening; it also includes an operating mechanism, an arc extinguishing cover and a contact assembly, and the operating mechanism, arc extinguishing cover and contact assembly are installed in the accommodating cavity through the assembly opening.

2. The explosion-proof circuit breaker according to claim 1, characterized in that: The accommodating cavity is provided with at least one electromagnetic release and a fixing bracket, the electromagnetic release is mounted on the fixing bracket, and the fixing bracket is mounted in the accommodating cavity through an assembly opening; Alternatively, the accommodating cavity is provided with at least one electromagnetic release and a fixing bracket, the electromagnetic release and the locking assembly of the operating mechanism are mounted on the fixing bracket, and the fixing bracket is mounted in the accommodating cavity through the assembly opening.

3. The explosion-proof circuit breaker according to claim 2, characterized in that: The electromagnetic release and the fixing bracket include one of the following structures: Structure 1: The electromagnetic release includes an oil cup, a first slot and an elastic snap-on are provided on the fixed bracket, the openings of the first slot and the elastic snap-on are in the same direction, and the oil cup has a first clamping portion at one end of the pole shoe. When installed, the first clamping portion is aligned with the opening of the first slot, and the oil cup is pushed in so that the first clamping portion is clamped into the first slot and the elastic snap-on clamps the oil cup. Structure 2: The electromagnetic release includes an oil cup and an armature. One end of the oil cup has a pole shoe. The armature is rotatably arranged in a fixed bracket. The oil cup is fixed to the fixed bracket. The fixed bracket has a movable space corresponding to the pole shoe. The armature is located in the movable space. Structure three, the electromagnetic release includes a magnetic yoke, a fixing bracket having a mounting slot and a second clamping slot, the mounting slot and the second clamping slot having the same opening direction, and the magnetic yoke having a second clamping portion. When installing, the second clamping portion is aligned with the opening of the second clamping slot, and the magnetic yoke is pushed in so that the magnetic yoke enters the mounting slot; Structure 4: The electromagnetic release includes a magnetic yoke, a mounting groove is provided on the fixing bracket, the magnetic yoke is located in the mounting groove, and the mounting groove has a barb, which is engaged with the magnetic yoke to prevent the magnetic yoke from being separated from the mounting groove; Structure 5, the electromagnetic release includes a yoke, a fixing bracket having a mounting groove, the yoke is located in the mounting groove, the mounting groove has a first positioning portion, the yoke has a second positioning portion, the first positioning portion and the second positioning portion form a positioning fit; Structure six, the electromagnetic release includes a yoke, a fixing bracket has a mounting groove, the yoke is in the mounting groove, and the yoke and the fixing bracket are fastened by hot riveting to prevent the yoke from detaching from the mounting groove.

4. The explosion-proof circuit breaker according to claim 1, characterized in that: It also includes an inter-phase separation assembly, which divides the accommodating chamber into at least two sub-chambers, each of which is provided with an arc extinguishing cover and a contact assembly; the inter-phase separation assembly includes a first separator and a second separator; the first separator and the outer shell are plugged and fixed or integrally formed, the second separator and the first separator are plugged and fixed or the second separator and the sealing plate are integrally formed or the second separator and the sealing plate are fastened by a fastening structure, and the first separator and the second separator cooperate with each other to separate the accommodating chamber.

5. The explosion-proof circuit breaker according to claim 4, characterized in that: The operating mechanism includes a first rotating member that is rotatably arranged, and the first rotating member is rotatably arranged under the joint action of the first partition and the shell; And / or, the operating mechanism includes a second rotating member that is rotatably arranged, and the second rotating member is rotatably arranged under the joint action of the first partition and the shell.

6. The explosion-proof circuit breaker according to claim 1, characterized in that: Only one set of arc extinguishing covers and contact assemblies is provided in the accommodating cavity, and a first support member is provided on the sealing plate. The first support member and the sealing plate are integrally formed or fastened by a fastening structure; the operating mechanism includes a first rotating member and / or a second rotating member that is rotatably arranged, and the first rotating member and / or the second rotating member forms a rotating arrangement under the joint action of the first support member and the outer shell.

7. The explosion-proof circuit breaker according to claim 1, characterized in that: The contact assembly includes a static contact and a moving contact; the arc extinguishing hood is arranged close to the cover plate, and in the height direction of the circuit breaker, the arc extinguishing hood is located between the static contact and the cover plate; the length direction of the arc extinguishing hood is consistent with the length direction of the circuit breaker, and the arc extinguishing plates in the arc extinguishing hood are arranged in sequence along a straight line or along an arc in the length direction of the arc extinguishing hood.

8. The explosion-proof circuit breaker according to claim 7, characterized in that: The arc-extinguishing hood includes an arc-extinguishing hood shell and an arc-extinguishing plate, which is arranged on the arc-extinguishing hood shell; the arc-extinguishing hood shell has a first limiting portion, and the wall of the accommodating cavity has a second limiting portion that is adapted to the shape of the first limiting portion, and the second limiting portion extends to the assembly port. When the arc-extinguishing hood shell is installed, the first limiting portion is aligned with the second limiting portion and pushed into the accommodating cavity.

9. The explosion-proof circuit breaker according to claim 1, characterized in that: The contact assembly includes a stationary contact and a movable contact, the stationary contact having a first mounting portion, a third limiting portion having a shape matching that of the first mounting portion on a wall of the accommodating cavity, the third limiting portion extending to the assembly opening, and the stationary contact entering the accommodating cavity by aligning the first mounting portion with the third limiting portion during installation, and the first mounting portion being fastened in the accommodating cavity by screws; And / or, the contact assembly includes a static contact and a moving contact, and the accommodating cavity also has a fixed plate corresponding to the moving contact, the fixed plate is electrically connected to the moving contact, the fixed plate has a second mounting portion, and the wall of the accommodating cavity has a fourth limiting portion that matches the shape of the second mounting portion, the fourth limiting portion extends to the assembly port, and when the fixed plate is installed, the second mounting portion is aligned with the fourth limiting portion to enter the accommodating cavity, and the second mounting portion is fastened in the accommodating cavity by screws.

10. The explosion-proof circuit breaker according to claim 1, characterized in that: A cross structure is formed between the wall of the accommodating cavity and the sealing plate, and the cross structure surrounds the assembly opening; And / or, a glue-filling structure is provided between the housing and the sealing plate, and the glue-filling structure surrounds the assembly opening; And / or, the cover plate is at least partially embedded in the bottom surface of the housing.

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