Electromagnetic locking molded case circuit breaker

Abstract

The utility model relates to the field of circuit breakers, in particular to an electromagnetic locking molded case circuit breaker. Comprising a housing including a mounting seat and a cover plate; an electromagnet is arranged in the first side wall of the mounting seat and is electrically connected with the contact system; the cover plate comprises a front panel and a second side wall; a magnetic attraction sliding part sliding front and back is installed in the second side wall, a first sliding abutting part is arranged at the front end of the magnetic attraction sliding part, and a first inclined face is arranged on the first sliding abutting part. A locking rod is arranged in the front panel, a reset spring is arranged on the locking rod, a second sliding abutting portion abutting against the first inclined face is arranged on the rear side of the locking rod, a second inclined face is arranged on the second sliding abutting portion, and the second inclined face abuts against the first inclined face. The operating mechanism comprises a release handle, and a locking hole matched with the locking rod is formed in the release handle; the locking rod prevents the release handle from rotating when external force is received, and the electromagnet attracts the magnetic attraction sliding part to achieve reinforced fixation between the installation base and the cover plate.

Description

Technical Field

[0001] The utility model relates to the field of circuit breakers, in particular to a molded case circuit breaker with electromagnetic locking. Background Art

[0002] A molded case circuit breaker (MCCB) is an electrical device used to protect circuits from overload and short - circuit damage. It is an automatic circuit - breaking protection device and is widely used in industrial, commercial, and residential electrical systems. The following is a detailed introduction to the molded case circuit breaker:

[0003] Basic Functions

[0004] Overload protection: When the current in the circuit exceeds the set value, the molded case circuit breaker will automatically disconnect the circuit to prevent overheating of the wires or damage to the equipment.

[0005] Short - circuit protection: In case of a short - circuit, the circuit breaker can quickly cut off the current to prevent equipment damage or fire.

[0006] Under - voltage protection (for some models): Automatically disconnects the circuit when the voltage is lower than the set value to protect the equipment.

[0007] Structural Composition

[0008] Housing: The housing of the molded case circuit breaker is usually made of insulating plastic, providing electrical insulation and protection.

[0009] Contact system: It contains contacts and springs inside for opening and closing the circuit. The contact system automatically controls the opening and closing according to the magnitude of the current.

[0010] Trip unit: There are two types, namely thermal trip unit and magnetic trip unit. The thermal trip unit responds to overload conditions, and the magnetic trip unit responds to short - circuit conditions.

[0011] Adjusting mechanism: Used to set the trigger current value of the circuit breaker and can be adjusted according to actual needs.

[0012] Generally, the housing of the molded case circuit breaker is divided into two parts and is connected by screws or snap - connections. The former is not convenient for disassembly, and the latter has an unstable structure. Moreover, the release handle of the molded case circuit breaker can be easily operated by people.

[0013] Therefore, there is an urgent need to provide an improved technical solution to solve the above - mentioned technical problems. Content of the Utility Model

[0014] The purpose of the utility model is to provide a technical effect of a molded case circuit breaker with electromagnetic locking that can have a more stable structure and prevent power failure for the above - mentioned existing technical problems.

[0015] In view of this, the present utility model provides a molded case circuit breaker with electromagnetic locking, comprising:

[0016] A housing, which includes a mounting base and a cover plate. The mounting base and the cover plate form a mounting cavity, and a contact system, an operating mechanism, a release device, and a spring system are installed in the mounting cavity;

[0017] An electromagnet is provided inside the first side wall of the mounting base, and the electromagnet is electrically connected to the contact system;

[0018] The cover plate includes a front panel and a second side wall provided on the periphery and extending towards the mounting base;

[0019] A magnetically attracted sliding part that slides back and forth is installed inside the second side wall. A first sliding contact part is provided at the front end of the magnetically attracted sliding part, and a first inclined surface is provided on the first sliding contact part;

[0020] A locking rod that slides left and right is provided inside the front panel, and a return spring is provided on the locking rod. A second sliding contact part that abuts against the first inclined surface is provided at the rear side of the locking rod, and a second inclined surface is provided on the second sliding contact part. The second inclined surface abuts against the first inclined surface;

[0021] The operating mechanism includes a release handle, and a locking hole that cooperates with the locking rod is provided on the release handle.

[0022] Further, a flange is provided on the periphery of the locking rod, and a receiving cavity with the same outer diameter size as the flange is provided inside the front panel. A return spring is provided between the flange and the front panel.

[0023] Further, when locked, the left end of the locking rod penetrates through the cover plate and is flush with the surface of the cover plate.

[0024] Further, it further includes: a mounting plate for mounting the locking rod.

[0025] The beneficial effects of the present utility model are:

[0026] 1. The locking rod of the present utility model prevents the release handle from rotating when receiving an external force, and realizes the strengthened fixation between the mounting base and the cover plate by the electromagnet attracting the magnetically attracted sliding part.

[0027] 2. The hand-pulling part provided by the present utility model can pull the locking rod out of the locking hole. When it is necessary to cut off the circuit, first pull out the locking rod and then operate the release handle. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0029] Figure 2 is a structural schematic diagram of the left end face of the present utility model;

[0030] Figure 3Schematic diagram of the installation structure of the locking rod of the present utility model;

[0031] Figure 4 Schematic diagram of the structure of the locking rod and the magnetic attraction sliding part of the present utility model.

[0032] The markings in the figure are indicated as:

[0033] 1. Mounting base; 2. Cover plate; 3. Front panel; 4. Electromagnet; 5. Second side wall; 6. First side wall; 7. Magnetic attraction sliding part; 8. First sliding contact part; 9. First inclined surface; 10. Locking rod; 11. Return spring; 12. Second sliding contact part; 13. Second inclined surface; 14. Release handle; 15. Locking hole; 16. Flange; 17. Mounting plate; 18. Hand pulling part. Specific embodiments

[0034] Next, the technical solutions in the embodiments of the present application will be clearly described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope protected by the present application.

[0035] Embodiment 1:

[0036] This embodiment provides a plastic case circuit breaker with electromagnetic locking, including:

[0037] A housing, the housing includes a mounting base 1 and a cover plate 2, the mounting base 1 and the cover plate 2 form a mounting cavity, and a contact system, an operating mechanism, a release device and a spring system are installed in the mounting cavity;

[0038] An electromagnet 4 is provided inside the first side wall 6 of the mounting base 1, and the electromagnet 4 is electrically connected to the contact system;

[0039] The cover plate 2 includes a front panel 3 and a second side wall provided on the periphery and extending towards the mounting base 1;

[0040] A magnetically attracted sliding part 7 that slides back and forth is installed inside the second side wall. A first sliding contact part 8 is provided at the front end of the magnetically attracted sliding part 7, and a first inclined surface 9 is provided on the first sliding contact part 8;

[0041] A locking rod 10 that slides left and right is provided inside the front panel 3, and a return spring 11 is provided on the locking rod 10. A second sliding contact part 12 that abuts against the first inclined surface 9 is provided at the rear side of the locking rod 10, and a second inclined surface 13 is provided on the second sliding contact part 12, and the second inclined surface 13 abuts against the first inclined surface 9;

[0042] The operating mechanism includes a release handle 14, and a locking hole 15 that cooperates with the locking rod 10 is provided on the release handle 14.

[0043] The structure of a molded case circuit breaker generally includes: a housing (Molded Case)

[0044] Material: Usually made of plastics with high temperature resistance and good insulation performance, such as epoxy resin or polycarbonate.

[0045] Function: Provide mechanical protection and electrical insulation to prevent electric shock or short circuit.

[0046] Contacts system (Contacts)

[0047] Moving contact and static contact: The circuit breaker contains two main contacts - the moving contact and the static contact inside. When the circuit breaker is disconnected, these two contacts will separate to cut off the circuit.

[0048] Contact material: Contacts are generally made of materials with high temperature resistance and wear resistance, such as silver alloy, to ensure long-term stable electrical conductivity and durability.

[0049] Trip mechanism (Trip Mechanism)

[0050] Thermal trip mechanism (Thermal Trip Mechanism): Composed of a bimetallic strip or other thermosensitive materials. When the current exceeds the set value, the bimetallic strip bends due to heating, thus triggering the trip.

[0051] Magnetic trip mechanism (Magnetic Trip Mechanism): Composed of an electromagnet. When the current instantaneously reaches the short-circuit current, the magnetic field generated by the electromagnet will quickly drive the moving iron core to disconnect the circuit.

[0052] Spring mechanism (SpringMechanism)

[0053] Function: Used to quickly operate the contacts system, changing the contacts from the closed state to the open state. The spring can provide the required force to quickly disconnect the circuit.

[0054] Material: Usually made of spring steel, with excellent elasticity and durability.

[0055] Adjustment mechanism (AdjustmentMechanism)

[0056] Function: Allows users to adjust the current value of overload trip according to actual needs. The adjustment mechanism can include forms such as a knob, a screw, or a digital display screen, etc.

[0057] Type: Includes adjustable overload trip devices, short-circuit trip devices, etc.

[0058] Release mechanism (Release Mechanism)

[0059] Function: When the release is triggered, the release mechanism will push the circuit breaker contacts apart, thus cutting off the current.

[0060] Structure: It can be in the form of a mechanical lever, spring, etc., ensuring that the circuit breaker can quickly and reliably cut off the current.

[0061] Auxiliary Contacts

[0062] Function: Used to detect the state of the circuit breaker (such as open or closed) and provide feedback to an external control system.

[0063] Types: Usually include normally open (NO) and normally closed (NC) contacts, facilitating linkage with other control systems.

[0064] Operating Handle

[0065] Function: Allows the user to manually operate the circuit breaker for closing or opening operations.

[0066] Position Indication: Usually marked with "ON", "OFF", or "TRIP" status indicators for convenient operation and status confirmation.

[0067] Protection Modules

[0068] Function: Some advanced circuit breakers may be equipped with digital protection modules for providing more precise overload and short - circuit protection, and can be set and monitored through a display screen or communication interface.

[0069] Arc Quenching Device

[0070] Function: When the circuit breaker disconnects the current, the arc quenching device is used to extinguish the arc to protect the contacts from damage by high - temperature arcs.

[0071] Types: Include air arc chambers, oil arc chambers, etc. The specific design is based on the rated current of the circuit breaker and application requirements.

[0072] The housing specifically includes a mounting base 1 and a cover plate 2. The mounting base 1 is at the rear side, and the cover plate 2 is at the front side. The mounting base 1 and the cover plate 2 are snapped together to form a mounting cavity. The above various structures are provided in the mounting cavity, which is prior art and the specific structures will not be described in detail; an electromagnet 4 is provided in each of the first side walls 6 on both sides of the mounting base 1. It is also possible to only provide the electromagnet 4 on one side and the other side is hinged. The electromagnet 4 is connected to the contact system. When the circuit breaker is energized and in a closed state, the electromagnet 4 is in a working state and generates magnetic force; the cover plate 2 includes two parts, a front panel 3 and a second side wall provided on the peripheral side and extending towards the mounting base 1. A magnetically attracted sliding part 7 that slides back and forth is installed in the second side wall. One end of the magnetically attracted sliding part 7 close to the electromagnet 4 is made of a magnetically attractable metal material, such as iron, steel, etc.; a first sliding contact part 8 is provided at the front end (the end far from the electromagnet 4) of the magnetically attracted sliding part 7. A first inclined surface 9 is provided on the first sliding contact part 8. A locking rod 10 that slides left and right is provided in the front panel 3, and a return spring 11 is provided on the locking rod 10. A second sliding contact part 12 that abuts against the first inclined surface 9 is provided at the rear side of the locking rod 10. A second inclined surface 13 is provided on the second sliding contact part 12. The second inclined surface 13 abuts against the first inclined surface 9. The operating mechanism includes a release handle 14, and a locking hole 15 that cooperates with the locking rod 10 is provided on the release handle 14.

[0073] Working principle: When the circuit is closed, the electromagnet 4 works. One end of the magnetically attracted sliding part 7 close to the electromagnet 4 abuts against the electromagnet 4. The abutting movement of the first inclined surface 9 and the second inclined surface 13 causes the locking rod 10 to slide to the right, so that the right end of the locking rod 10 is inserted into the locking hole 15, realizing the locking of the release handle 14 to prevent the release handle 14 from rotating when receiving an external force, and the installation base 1 and the cover plate 2 are strengthened and fixed by the adsorption of the electromagnet 4 on the magnetically attracted sliding part 7.

[0074] Embodiment 2:

[0075] This embodiment provides a molded case circuit breaker with electromagnetic locking. In addition to including the technical solutions of the above embodiment, it also has the following technical features.

[0076] A flange 16 is provided on the periphery of the locking rod 10, and a receiving cavity with the same outer diameter size as the flange 16 is provided in the front panel 3. A return spring 11 is provided between the flange 16 and the front panel 3.

[0077] A flange 16 extends outwardly from the locking rod 10, and a receiving groove that can accommodate the flange 16 and enable the flange 16 to slide is provided in the front panel 3. A return spring 11 is provided between the flange 16 and the end face of the receiving cavity.

[0078] Embodiment 3:

[0079] This embodiment provides a molded case circuit breaker with electromagnetic locking. In addition to the technical solutions of the above embodiments, it also has the following technical features.

[0080] When locking, the left end of the locking rod 10 penetrates through the cover plate 2 and is flush with the surface of the cover plate 2.

[0081] When a circuit break occurs or the electromagnet 4 is damaged, the electromagnet 4 loses its magnetic force. Under the action of the return spring 11, the locking rod 10 disengages from the locking hole 15, and the left end of the locking rod 10 protrudes from the surface of the cover plate 2, reminding the personnel that the electromagnet 4 has failed.

[0082] Embodiment 4:

[0083] This embodiment provides a molded case circuit breaker with electromagnetic locking. In addition to the technical solutions of the above embodiments, it also has the following technical features.

[0084] It further includes: a mounting plate 17 for mounting the locking rod 10.

[0085] The mounting plate 17 is used to mount the locking rod 10. The mounting plate 17 and the front panel 3 form a chamber for mounting the locking rod 10 and are fixed by means of snap-fastening or adhesive bonding, etc.

[0086] Embodiment 5:

[0087] This embodiment provides a molded case circuit breaker with electromagnetic locking. In addition to the technical solutions of the above embodiments, it also has the following technical features.

[0088] A manual pulling part 18 is further provided on the left end of the locking rod 10.

[0089] The provided manual pulling part 18 can pull the locking rod 10 out of the locking hole 15. When a circuit break is required, first pull out the locking rod 10 and then operate the release handle 14.

[0090] The embodiments of the present application have been described above in conjunction with the accompanying drawings. Without conflict, the embodiments and the features in the embodiments in the present application can be combined with each other. The present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims, and all of them belong to the protection scope of the present application.

Claims

1. An electromagnetically locked molded case circuit breaker, characterized in that: include: A housing, the housing comprising a mounting seat (1) and a cover plate (2), the mounting seat (1) and the cover plate (2) forming a mounting cavity, and a contact system, an operating mechanism, a release device and a spring system are mounted in the mounting cavity; An electromagnet (4) is provided inside a first side wall (6) of the mounting seat (1), and the electromagnet (4) is electrically connected to the contact system; The cover plate (2) comprises a front panel (3) and a second side wall provided on the peripheral side and extending towards the mounting seat (1); A magnetic attraction sliding part (7) that slides forward and backward is installed in the second side wall, a first sliding contact part (8) is provided at the front end of the magnetic attraction sliding part (7), and a first inclined surface (9) is provided on the first sliding contact part (8); A locking rod (10) that slides left and right is provided in the front panel (3), and a return spring (11) is provided on the locking rod (10); a second sliding contact portion (12) that contacts the first inclined surface (9) is provided on the rear side of the locking rod (10); a second inclined surface (13) is provided on the second sliding contact portion (12), and the second inclined surface (13) contacts the first inclined surface (9); The operating mechanism comprises a release handle (14), and the release handle (14) is provided with a locking hole (15) matched with the locking rod (10).

2. The electromagnetically locked molded case circuit breaker according to claim 1, characterized in that: A flange (16) is provided on the peripheral side of the locking rod (10), and a receiving cavity with the same outer diameter as the flange (16) is provided in the front panel (3), and a return spring (11) is provided between the flange (16) and the front panel (3).

3. The electromagnetically locked molded case circuit breaker according to claim 1, characterized in that: When locked, the left end of the locking rod (10) penetrates the cover plate (2) and is flush with the surface of the cover plate (2).

4. The electromagnetically locked molded case circuit breaker according to claim 1, characterized in that: Also includes: The mounting plate (17) is used to mount the locking rod (10).

5. The electromagnetically locked molded case circuit breaker according to claim 3, characterized in that: A hand-pull portion (18) is also provided on the left end of the locking rod (10).

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