Pluggable circuit breaker

Abstract

The invention relates to the technical field of electric equipment, in particular to a plug-in type circuit breaker which comprises a shell, a handle is installed at the top of the shell, a static contact, a moving contact and an armature are arranged in the shell, a bimetallic strip is arranged on one side of the armature, a magnet yoke is installed on the bimetallic strip, and the bimetallic strip is connected to the moving contact through a soft connector. And a jump pin is arranged above the moving contact. In the plug-in circuit breaker, the handle pushes the re-buckling shaft to realize the movement of the tripping buckle, so that the contact and separation of the moving contact and the static contact are controlled, and the operation is simple, convenient and rapid. Two mechanisms of magnetic protection and thermal protection are combined. The magnet yoke provides magnetic protection, and when the current is abnormal, the generated magnetic field force can quickly attract the armature, so that the armature is separated from the jump pin, and the circuit is cut off. The bimetallic strip provides thermal protection, and when the bimetallic strip is heated to deform due to overlarge current, the armature is driven to be separated from the jump pin, and the circuit is cut off.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical equipment, in particular to a plug-in circuit breaker. Background Art

[0002] In modern electrical systems, circuit breakers, as key safety devices, play an important role in protecting circuits from overloads, short circuits and other fault conditions. Although traditional circuit breakers can meet basic electrical protection needs to a certain extent, with the continuous development of electrical technology and the diversification of application environments, higher requirements are placed on the performance of circuit breakers. Especially in applications that require frequent plugging and unplugging, fast response and high integration, traditional circuit breakers often have problems such as inconvenient operation, slow response speed and insufficient protection accuracy.

[0003] As a new type of electrical protection equipment, pluggable circuit breakers have emerged. It combines the protection function of traditional circuit breakers with the convenient plug-in design, making the installation, maintenance and replacement of electrical systems simpler and faster. However, existing pluggable circuit breakers still have many shortcomings in terms of structural design, protection mechanism and user experience. For example, the contact design of some pluggable circuit breakers is unreasonable, resulting in large contact resistance, easy heat generation, and shortened service life; the protection mechanism of some products is single, and multiple protections such as overcurrent and overheating cannot be realized at the same time; and some products are complicated to operate and have poor user-friendliness, which brings inconvenience to the daily management and maintenance of electrical systems. Summary of the invention

[0004] The object of the present invention is to provide a pluggable circuit breaker to solve the problems that the existing pluggable circuit breakers mentioned in the above background technology still have many deficiencies in structural design, protection mechanism and user experience.

[0005] To achieve the above-mentioned purpose, the present invention provides a pluggable circuit breaker, comprising a shell, a handle is installed on the top of the shell, a static contact, a moving contact and an armature are arranged inside the shell, a bimetallic strip is arranged on one side of the armature, a yoke is installed on the bimetallic strip, the bimetallic strip is connected to the moving contact through a soft connection, a jumper is arranged above the moving contact, the moving contact is connected to the jumper through a contact spring, and the moving contact is pushed by the handle to swing and then contact the static contact.

[0006] As a preferred solution of the present invention, a spring sheet is installed on one side of the bottom of the shell, the inner side of the spring sheet is connected to the static contact, a terminal screw assembly is installed on the other side of the shell, the inner side of the terminal screw assembly is connected to a terminal block, the terminal block is connected to a bimetallic strip, the outer side of the spring sheet is clamped with an incoming line terminal, and the external connection of the terminal screw assembly is connected to a load terminal.

[0007] As a preferred solution of the present invention, an adjusting screw hole is provided on the terminal board, and an adjusting bolt is installed on the adjusting screw hole. The end of the adjusting bolt is clamped on the outer wall of the outer shell. By locking the adjusting bolt, the position of the bimetallic strip is changed to adjust the overlap stroke of the armature and the jump buckle, thereby achieving the purpose of adjusting the overload delay protection time.

[0008] As a preferred solution of the present invention, the yoke is riveted on a bimetallic sheet, the yoke is provided with a U-shaped groove, and the armature is movably connected in the U-shaped groove of the yoke.

[0009] As a preferred solution of the present invention, the top end of the armature is fixed inside the housing via an armature return spring.

[0010] As a preferred solution of the present invention, one end of the jump buckle is rotatably connected to the inner wall of the outer shell through a pin shaft, and a re-buckle shaft is installed on the jump buckle. The handle can realize the movement of the jump buckle by pushing the re-buckle shaft, thereby making the end of the jump buckle snap into the bayonet position of the armature to form a overlapping effect.

[0011] As a preferred solution of the present invention, a tripping linkage rod is installed inside the housing, and the tripping linkage rod is rotatably connected to the inner wall of the housing through a pin shaft.

[0012] As a preferred solution of the present invention, a push block is installed near the tripping linkage rod of the tripping latch. When the handle is operated to open the switch, the push block can push the tripping linkage rod to swing, thereby squeezing the armature to move, so that the armature is away from the tripping latch.

[0013] As a preferred solution of the present invention, the middle portion of the handle is rotatably connected to the inner wall of the shell via a pin.

[0014] As a preferred solution of the present invention, a magnetic conductive sheet is installed on the inner side of the housing close to the static contact.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. In this plug-in circuit breaker, the handle design installed on the top of the shell allows users to easily perform plug-in and pull-out operations, greatly improving the installation, maintenance and replacement efficiency of the electrical system. At the same time, the handle realizes the movement of the tripping by pushing the re-tightening shaft, thereby controlling the contact and separation of the moving contact and the static contact, which is easy and quick to operate.

[0017] 2. The plug-in circuit breaker combines two mechanisms: magnetic protection and thermal protection. The magnetic yoke provides magnetic protection. When the current is abnormal, the magnetic field force generated can quickly attract the armature, causing the armature to separate from the trip button, thereby cutting off the circuit. The bimetallic strip provides thermal protection. When the current is too large and causes the bimetallic strip to deform due to heat, it will also cause the armature to separate from the trip button, cutting off the circuit. This dual protection mechanism ensures that the circuit breaker can respond quickly in a variety of fault conditions to protect the circuit safety.

[0018] 3. In this plug-in circuit breaker, the user can easily adjust the position of the bimetallic strip through the adjustment bolt on the terminal board, thereby changing the overlap stroke of the armature and the trip button, and realizing the precise adjustment of the overload delay protection time. This design enables the circuit breaker to be flexibly configured according to different application environments and protection requirements, improving the protection accuracy and applicability.

[0019] 4. In this plug-in circuit breaker, the moving contact is connected to the jumper through the contact spring, and is pushed by the handle to swing and form a reliable contact with the static contact. This design reduces contact resistance, reduces heating, and extends the service life of the circuit breaker. At the same time, the magnetic sheet installed on the inside of the shell further enhances the conductivity and improves the overall performance of the circuit breaker.

[0020] 5. In this plug-in circuit breaker, when the handle is manually opened, the push block can push the trip linkage rod to swing, thereby squeezing the armature to move and keep the armature away from the tripping. This trip linkage mechanism ensures that the circuit breaker can be manually and quickly cut off the circuit in the event of a fault, reducing the impact of the fault on the electrical system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is one of the structural schematic diagrams of the free tripping position of the present invention;

[0022] Figure 2 This is one of the structural schematic diagrams of the free tripping position of the present invention;

[0023] Figure 3 It is a structural schematic diagram of the re-deduction and opening gate position in the present invention;

[0024] Figure 4 It is a structural schematic diagram of the closing position in the present invention;

[0025] Figure 5 It is a partial structural schematic diagram of the present invention;

[0026] The meaning of each number in the figure is:

[0027] 1. Housing; 11. Spring piece; 12. Terminal screw assembly; 13. Terminal board; 14. Adjusting bolt; 15. Bimetallic strip; 16. Magnetic yoke; 17. Soft connection; 18. Magnetic conductive sheet; 2. Handle; 3. Static contact; 4. Moving contact; 41. Contact spring; 5. Jumper; 51. Re-clamping shaft; 52. Push block; 6. Armature; 61. Armature reset spring; 62. Bayonet; 7. Release linkage rod. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] The present invention provides a plug-in circuit breaker, such as Figure 1-Figure 5 As shown, it includes a housing 1, a handle 2 is installed on the top of the housing 1, a static contact 3, a moving contact 4, and an armature 6 are arranged inside the housing 1, a bimetallic strip 15 is arranged on one side of the armature 6, a yoke 16 is installed on the bimetallic strip 15, the bimetallic strip 15 is connected to the moving contact 4 through a soft connection 17, a jumper 5 is arranged above the moving contact 4, the moving contact 4 is connected to the jumper 5 through a contact spring 41, and the moving contact 4 is pushed by the handle 2 to swing and then contact the static contact 3. The handle 2 installed on the top of the housing 1 allows the user to easily perform plug-in and unplug and switch operations without complicated tools or steps, which greatly improves the convenience and efficiency of operation.

[0030] The moving contact 4 is flexibly connected to the tripping buckle 5 through the contact spring 41, and can be swung by the push of the handle 2, thereby forming a close contact with the stationary contact 3. This design ensures that the circuit can be stably turned on during normal operation, reduces contact resistance, reduces heat and arcing caused by poor contact, and improves the reliability and service life of the circuit breaker.

[0031] The bimetallic strip 15 and the yoke 16 arranged on one side of the armature 6 together constitute the dual protection mechanism of the circuit breaker. The bimetallic strip 15 can deform in response to overheating of the current, and drive the moving contact 4 or the armature 6 to move through the soft connection 17 to achieve thermal protection; while the yoke 16 can generate magnetic field force when the current is abnormal, attracting the armature 6 to move and achieve magnetic protection. This dual protection mechanism ensures that the circuit breaker can quickly and reliably cut off the circuit in various fault conditions to protect electrical equipment and personal safety.

[0032] The moving contact 4 is connected to the tripping buckle 5 through the contact spring 41, so that the movement of the contact is more flexible and controllable. Under the push of the handle 2, the moving contact 4 can quickly and accurately contact or separate with the static contact 3, realizing accurate control of the circuit.

[0033] In this embodiment, a spring 11 is installed on one side of the bottom of the housing 1, and the inner side of the spring 11 is connected to the static contact 3. A terminal screw assembly 12 is installed on the other side of the housing 1, and the inner side of the terminal screw assembly 12 is connected to a terminal board 13, and the terminal board 13 is connected to a bimetallic strip 15. The outer side of the spring 11 is clamped with an incoming line terminal, and the external connection of the terminal screw assembly 12 is connected to the load terminal. This design facilitates the rapid wiring and connection of the incoming line terminal and the load terminal, and improves the installation efficiency and convenience of the circuit breaker. The design of the spring 11 ensures stable contact between the static contact 3 and the incoming line terminal, reducing circuit failures caused by poor contact.

[0034] Specifically, an adjusting screw hole is provided on the terminal board 13, and an adjusting bolt 14 is installed on the adjusting screw hole. The end of the adjusting bolt 14 is clamped on the outer wall of the shell 1. By locking the adjusting bolt 14, the position of the bimetallic strip 15 is changed to adjust the overlapping stroke of the armature 6 and the jump buckle 5, thereby achieving the purpose of adjusting the overload delay protection time.

[0035] Furthermore, the yoke 16 is riveted to the bimetallic strip 15, and the yoke 16 is provided with a U-shaped groove, and the armature 6 is movably connected in the U-shaped groove of the yoke 16. This design enhances the connection stability between the yoke 16 and the bimetallic strip 15. The design of the U-shaped groove enables the armature 6 to move flexibly in the yoke 16, which facilitates the realization of the functions of magnetic protection and thermal protection.

[0036] Furthermore, the top of the armature 6 is fixed inside the housing 1 by an armature return spring 61. This design ensures that the armature 6 can maintain a stable position when not subjected to external forces. The presence of the iron return spring 61 enables the armature 6 to quickly return to its original position after moving under the action of the yoke 16 or the bimetallic strip 15, so as to prepare for the next protection action.

[0037] Furthermore, one end of the jump buckle 5 is rotatably connected to the inner wall of the outer shell 1 through a pin shaft, and a re-lock shaft 51 is installed on the jump buckle 5. The handle 2 can realize the movement of the jump buckle 5 by pushing the re-lock shaft 51, so that the end of the jump buckle 5 is inserted into the bayonet 62 of the armature 6 to form an overlapping effect.

[0038] Furthermore, a tripping linkage rod 7 is installed inside the housing 1 , and the tripping linkage rod 7 is rotatably connected to the inner wall of the housing 1 through a pin shaft.

[0039] Furthermore, a push block 52 is installed near the tripping link rod 7 of the tripping buckle 5. When the handle 2 is manually driven, the push block 52 can push the tripping link rod 7 to swing, thereby squeezing the armature 6 to move, so that the armature 6 is away from the tripping buckle 5.

[0040] Furthermore, the middle portion of the handle 2 is rotatably connected to the inner wall of the housing 1 via a pin.

[0041] Furthermore, a magnetic conductive sheet 18 is installed on the inner side of the housing 1 near the stationary contact 3. When current passes through the contact, a magnetic field is generated. The magnetic conductive sheet can enhance the effect of the magnetic field, making the magnetic field more concentrated and powerful, which helps to improve the breaking capacity and arc extinguishing effect of the circuit breaker.

[0042] The yoke 16 provides magnetic protection and the bimetallic strip 15 provides thermal protection. The bimetallic strip 15 generates heat when current passes through it. When the current is large enough, the bimetallic strip 15 is deformed by the heat, driving the armature 6 to separate from the tripping catch 5, thereby cutting off the circuit. The magnetic field force generated by the yoke 16 overcomes the force of the armature return spring 61 to attract the armature 6, thereby driving the armature 6 to separate from the tripping catch 5. The tripping catch 5 is provided with a protrusion near the moving contact 4. When the tripping catch 5 swings, it can push the moving contact 4 to swing, so that it is separated from the static contact 3, thereby cutting off the circuit.

[0043] When the plug-in circuit breaker of the present invention is in use, first, when the circuit breaker is in a normal working state, the handle 2 is in a closed position, and the moving contact 4 is in close contact with the static contact 3 by the elastic force of the contact spring 41, and the circuit is in a conducting state. The armature 6 maintains a stable position under the action of the armature return spring 61 and does not separate from the tripping buckle 5. The bimetallic strip 15 and the yoke 16 are both in an inactive state.

[0044] When an overload or short circuit occurs in the circuit, resulting in excessive current, the current generates a large amount of heat through the bimetal strip 15. The bimetal strip 15 is deformed due to uneven heating, and the deformation force is transmitted to the moving contact 4 or the armature 6 through the soft connection 17. When the deformation reaches a certain degree, the overlap stroke of the armature 6 and the jumper 5 changes, causing the armature 6 to separate from the jumper 5. The jumper 5 swings and acts on the moving contact 4, causing the moving contact 4 to quickly separate from the static contact 3, cutting off the circuit and achieving thermal protection.

[0045] When an abnormally large current appears in the circuit, a strong magnetic field is generated around the yoke 16. The magnetic field force overcomes the elastic force of the armature return spring 61, attracting the armature 6 to move toward the yoke 16. The movement of the armature 6 causes the overlap stroke between it and the tripping catch 5 to change, and finally detaches from the tripping catch 5. Similar to thermal protection, the detachment of the tripping catch 5 causes the moving contact 4 to separate from the static contact 3, cutting off the circuit and achieving magnetic protection.

[0046] When the circuit needs to be cut off manually, the user can rotate the handle 2 from the closing position to the opening position. The rotation of the handle 2 pushes the tripping linkage rod 7 to move, so that the end of the tripping buckle 5 is disengaged from the bayonet 62 of the armature 6. The disengagement of the tripping buckle 5 causes the moving contact 4 to separate from the stationary contact 3 under the action of the contact spring 41, thereby cutting off the circuit.

[0047] The position of the bimetallic strip 15 can be changed by adjusting the adjusting bolt 14 on the terminal block 13. Tightening or loosening the adjusting bolt 14 will change the overlap stroke of the armature 6 and the tripping buckle 5, thereby affecting the time required for the bimetallic strip 15 to be deformed by heat and to be separated from the tripping buckle 5. In this way, the overload delay protection time can be adjusted to meet the needs of different application scenarios.

[0048] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A pluggable circuit breaker, comprising a housing (1), characterized in that: A handle (2) is installed on the top of the housing (1), and a stationary contact (3), a moving contact (4), and an armature (6) are arranged inside the housing (1). A bimetallic strip (15) is arranged on one side of the armature (6), and a yoke (16) is installed on the bimetallic strip (15). The bimetallic strip (15) is connected to the moving contact (4) through a soft connection (17). A trip button (5) is arranged above the moving contact (4), and the moving contact (4) is connected to the trip button (5) through a contact spring (41). The moving contact (4) is pushed by the handle (2) to swing and then contact the stationary contact (3).

2. The pluggable circuit breaker according to claim 1, characterized in that: A spring sheet (11) is installed on one side of the bottom of the housing (1), and the inner side of the spring sheet (11) is connected to the static contact (3). A terminal screw assembly (12) is installed on the other side of the housing (1), and the inner side of the terminal screw assembly (12) is connected to a terminal block (13), and the terminal block (13) is connected to a bimetallic strip (15). The outer side of the spring sheet (11) is clamped with an incoming line terminal, and the terminal screw assembly (12) is externally connected to a load terminal.

3. The pluggable circuit breaker according to claim 2, characterized in that: The terminal board (13) is provided with an adjusting screw hole, and an adjusting bolt (14) is installed on the adjusting screw hole. The end of the adjusting bolt (14) is clamped on the outer wall of the housing (1). By tightening the adjusting bolt (14), the position of the bimetallic strip (15) is changed, so as to adjust the overlap stroke of the armature (6) and the jumper (5), thereby achieving the purpose of adjusting the overload delay protection time.

4. The pluggable circuit breaker according to claim 1, characterized in that: The magnetic yoke (16) is riveted on the bimetallic sheet (15), the magnetic yoke (16) is provided with a U-shaped groove, and the armature (6) is movably connected in the U-shaped groove of the magnetic yoke (16).

5. The pluggable circuit breaker according to claim 1, characterized in that: The top end of the armature (6) is fixed inside the housing (1) via an armature return spring (61).

6. The pluggable circuit breaker according to claim 1, characterized in that: One end of the jump buckle (5) is rotatably connected to the inner wall of the housing (1) via a pin shaft, and a re-locking shaft (51) is mounted on the jump buckle (5). The handle (2) can realize the movement of the jump buckle (5) by pushing the re-locking shaft (51), thereby causing the end of the jump buckle (5) to be snapped into the snap-in position (62) of the armature (6), thereby forming an overlapping effect.

7. The pluggable circuit breaker according to claim 6, characterized in that: A tripping linkage rod (7) is installed inside the housing (1), and the tripping linkage rod (7) is rotatably connected to the inner wall of the housing (1) via a pin shaft.

8. The pluggable circuit breaker according to claim 7, characterized in that: The trip lock (5) is provided with a push block (52) near the trip linkage rod (7). When the handle (2) is opened, the push block (52) can push the trip linkage rod (7) to swing, thereby squeezing the armature (6) to move, thereby moving the armature (6) away from the trip lock (5).

9. The pluggable circuit breaker according to claim 7, characterized in that: The middle part of the handle (2) is rotatably connected to the inner wall of the outer shell (1) via a pin.

10. The pluggable circuit breaker according to claim 1, characterized in that: A magnetic conductive sheet (18) is installed on the inner side of the housing (1) close to the stationary contact (3).

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