Molded case circuit breaker convenient for heat dissipation

Abstract

The utility model relates to the field of circuit breakers, in particular to a molded case circuit breaker convenient for heat dissipation. Comprising a housing including a mounting seat and a cover plate; a heat dissipation assembly is arranged on the rear end face of the installation base. The heat dissipation assembly comprises two switching box bodies, an overflowing pipeline is connected between the two switching box bodies in a communicating mode, heat dissipation fins are arranged outside the overflowing pipeline and between the two switching box bodies, a fixing frame is arranged between the upper ends and the lower ends of the two switching box bodies, a backflow assembly is arranged at the outer side end of one switching box body, and a heat dissipation assembly is arranged at the outer side end of the other switching box body. The input end of the backflow assembly is communicated and connected with one end of a heat circulation pipe, a heat transfer seat is arranged at the other end of the heat circulation pipe, the other side of the heat transfer seat is communicated and connected with a cold circulation pipe, and heat transfer cavities are formed in the positions, corresponding to the heat circulation pipe and the cold circulation pipe, in the heat transfer seat; according to the utility model, the cooling liquid is input into the heat transfer cavity in the heat transfer seat through the cold circulating pipe, and the heat of the molded case circuit breaker is continuously adsorbed.

Description

Technical Field

[0001] The utility model relates to the field of circuit breakers, in particular to a molded case circuit breaker facilitating heat dissipation. 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 - disconnecting 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 the wire from overheating or the equipment from being damaged.

[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] Release: There are two types, thermal release and magnetic release. The thermal release responds to overload conditions, and the magnetic release 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] During the operation of the molded case circuit breaker, high temperatures will indeed be generated. This is because when the molded case circuit breaker is working, the internal resistance will generate heat. Especially when current passes through, this heat will accumulate, resulting in an increase in the temperature of the circuit breaker itself.

[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 facilitating heat dissipation for the above - mentioned existing technical problems.

[0015] In view of this, the present utility model provides a plastic case circuit breaker that is convenient for heat dissipation, including:

[0016] A housing, the housing 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] A heat dissipation component is provided on the rear end face of the mounting base;

[0018] The heat dissipation component includes:

[0019] A diversion box body, the number of the diversion box bodies is two, an overcurrent pipeline is connected and communicated between the two diversion box bodies, heat dissipation fins are arranged outside the overcurrent pipeline and between the two diversion box bodies, a fixing frame is arranged between the upper and lower ends of the two diversion box bodies, a reflux component is arranged on the outer side end of one of the diversion box bodies, the input end of the reflux component is connected and communicated with one end of a heat circulation pipe, the other end of the heat circulation pipe is provided with a heat transfer seat, the other side of the heat transfer seat is connected and communicated with a cold circulation pipe, and a heat transfer cavity is opened at a position corresponding to the heat circulation pipe and the cold circulation pipe inside the heat transfer seat.

[0020] Further, the number of the heat circulation pipe, the cold circulation pipe, and the heat transfer cavity is two sets each, and each set of the heat circulation pipe, the cold circulation pipe, and the heat transfer cavity are arranged separately from each other. Connection ends are arranged at positions corresponding to the heat circulation pipe and the cold circulation pipe on the heat transfer seat, the diversion box body, and the reflux component, and the heat circulation pipe and the cold circulation pipe are inserted and connected with the connection ends.

[0021] Further, the reflux component includes a main body, a liquid injection box is connected and communicated with the upper end of the main body, a driving motor is arranged at the lower end of the main body, a reflux paddle wheel is arranged inside the main body at a position corresponding to the heat circulation pipe, the reflux paddle wheel is fixedly connected with the output end of the driving motor, and a liquid injection box is arranged on the main body.

[0022] Further, the fixing frame is fixedly connected with the two diversion box bodies by bolts, and fixing screws are arranged on the outer surface of one side of the fixing frame away from the heat transfer seat.

[0023] Further, a connecting threaded hole is penetrated and arranged on the heat transfer seat between the two heat transfer cavities.

[0024] The beneficial effects of the present utility model are:

[0025] 1. The present utility model inputs the coolant into the heat transfer cavity inside the heat transfer seat through the cold circulation pipe to adsorb the heat of the plastic case circuit breaker.

[0026] 2. The utility model connects the heat circulation pipe and the cold circulation pipe to the heat transfer seat, the switching box body and the reflux assembly through the plug-in connection of the heat circulation pipe and the cold circulation pipe with the connection end head. Description of the Drawings

[0027] Figure 1 It is a three-dimensional structure schematic diagram of the utility model;

[0028] Figure 2 It is a structure schematic diagram of the left end face of the utility model;

[0029] Figure 3 It is a structure schematic diagram of the installation of the heat dissipation component of the utility model.

[0030] The marks in the figure are shown as:

[0031] 1. Mounting seat; 2. Cover plate; 3. Switching box body; 4. Flow-through pipeline; 5. Heat sink; 6. Fixed frame; 7. Heat circulation pipe; 8. Cold circulation pipe; 9. Heat transfer seat; 10. Heat transfer cavity; 11. Main body; 12. Liquid injection box; 13. Driving motor; 14. Reflux paddle wheel; 15. Connecting threaded hole. Specific Embodiments

[0032] 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 of protection of the present application.

[0033] Embodiment 1:

[0034] This embodiment provides a plastic case circuit breaker that is convenient for heat dissipation, including:

[0035] A housing, the housing includes a mounting seat 1 and a cover plate 2, the mounting seat 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;

[0036] A heat dissipation component is provided on the rear end face of the mounting seat 1;

[0037] The heat dissipation component includes:

[0038] A bypass box body 3, the number of the bypass box bodies 3 is two, an overcurrent pipeline 4 is connected in a communicating manner between the two bypass box bodies 3, a heat sink 5 is arranged outside the overcurrent pipeline 4 and between the two bypass box bodies 3, a fixing frame 6 is arranged between the upper and lower ends of the two bypass box bodies 3, a reflux assembly is arranged at the outer end of one of the bypass box bodies 3, the input end of the reflux assembly is connected in a communicating manner to one end of a heat circulation pipe 7, the other end of the heat circulation pipe 7 is provided with a heat transfer seat 9, the other side of the heat transfer seat 9 is connected in a communicating manner to a cold circulation pipe 8, and a heat transfer cavity 10 is formed at a position corresponding to the heat circulation pipe 7 and the cold circulation pipe 8 inside the heat transfer seat 9.

[0039] The structure of a molded case circuit breaker generally includes: a housing (Molded Case)

[0040] Material: Usually made of plastics with high temperature resistance and good insulation performance, such as epoxy resin or polycarbonate.

[0041] Function: Provide mechanical protection and electrical insulation to prevent electric shock or short circuit.

[0042] Contact system (Contacts)

[0043] Moving contact and static contact: The circuit breaker internally contains two main contacts - the moving contact and the static contact. When the circuit breaker is disconnected, these two contacts will separate to cut off the circuit.

[0044] Contact material: The contacts are generally made of materials with high temperature resistance and wear resistance, such as silver alloy, to ensure long-term stable conductivity and durability.

[0045] Trip mechanism (Trip Mechanism)

[0046] 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, thereby triggering the trip.

[0047] 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.

[0048] Spring mechanism (Spring Mechanism)

[0049] Function: Used to quickly operate the contact system to change the contacts from the contact state to the disconnected state. The spring can provide the required force to quickly disconnect the circuit.

[0050] Material: Usually made of spring steel, with excellent elasticity and durability.

[0051] Adjustment Mechanism

[0052] Function: Allows users to adjust the current value of overload tripping according to actual needs. The adjustment mechanism can include forms such as a knob, screw, or digital display.

[0053] Type: Includes adjustable overload trip devices, short - circuit trip devices, etc.

[0054] Release Mechanism

[0055] Function: When triggering the trip device, the release mechanism will push the circuit breaker contacts apart, thus cutting off the current.

[0056] 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.

[0057] Auxiliary Contacts

[0058] Function: Used to detect the status of the circuit breaker (such as on or off) and provide feedback to an external control system.

[0059] Type: Usually includes normally open (NO) and normally closed (NC) contacts, facilitating linkage with other control systems.

[0060] Operating Handle

[0061] Function: Allows users to manually operate the circuit breaker for closing or opening operations.

[0062] Position Indication: Usually marked with status indications such as "ON", "OFF", or "TRIP", facilitating operation and status confirmation.

[0063] Protection Modules

[0064] 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 or communication interface.

[0065] Arc Quenching Device

[0066] 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.

[0067] Type: Includes air arc chambers, oil arc chambers, etc., and the specific design is based on the rated current of the circuit breaker and application requirements.

[0068] It includes a diversion box body 3. The number of the diversion box bodies 3 is two. An overcurrent pipeline 4 is connected in communication between the two diversion box bodies 3. A heat sink 5 is arranged outside the overcurrent pipeline 4 and between the two diversion box bodies 3. A fixing frame 6 is arranged between the upper and lower ends of the two diversion box bodies 3. A reflux assembly is arranged at the outer end of one of the diversion box bodies 3. The input end of the reflux assembly is connected in communication with one end of a heat circulation pipe 7. The other end of the heat circulation pipe 7 is provided with a heat transfer seat 9. The other side of the heat transfer seat 9 is connected in communication with a cold circulation pipe 8. A heat transfer cavity 10 is formed at a position inside the heat transfer seat 9 corresponding to the heat circulation pipe 7 and the cold circulation pipe 8.

[0069] During use, through the reflux assembly, it circulates among the diversion box body 3, the overcurrent pipeline 4, the reflux assembly, the heat circulation pipe 7, the heat transfer cavity 10 and the cold circulation pipe 8. The heat transfer seat 9 is abutted against the back of the mounting seat 1 of the molded case circuit breaker and is located at a position with relatively high heat generation. Thermal conductive grease is filled between the heat transfer seat 9 and the heat source to improve the thermal conductivity. The heat is conducted by the coolant and circulates into one side of the diversion box body 3 through the heat circulation pipe 7 under the power of the reflux assembly, and then is input onto the overcurrent pipeline 4. The heat is dissipated through the heat sink 5 arranged on the overcurrent pipeline 4. The cooled coolant is input into the other side of the diversion box body 3 through the overcurrent pipeline 4. The two diversion box bodies 3 are fixedly connected through the fixing frame, and the coolant is input into the heat transfer cavity 10 inside the heat transfer seat 9 through the cold circulation pipe 8 to continue to adsorb the heat of the molded case circuit breaker.

[0070] Embodiment 2:

[0071] This embodiment provides a molded case circuit breaker that is convenient for heat dissipation. In addition to including the technical solutions of the above embodiment, it also has the following technical features.

[0072] The number of the heat circulation pipes 7, the cold circulation pipes 8 and the heat transfer cavities 10 is two sets. Each set of the heat circulation pipes 7, the cold circulation pipes 8 and the heat transfer cavities 10 is arranged in isolation from each other. Connection ends are arranged at positions on the heat transfer seat 9, the diversion box body 3 and the reflux assembly corresponding to the heat circulation pipes 7 and the cold circulation pipes 8. The heat circulation pipes 7 and the cold circulation pipes 8 are connected in a plug-in manner with the connection ends. By arranging the connection ends on the heat transfer seat 9, the diversion box body 3 and the reflux assembly, and through the plug-in connection of the heat circulation pipes 7 and the cold circulation pipes 8 with the connection ends, the heat circulation pipes 7 and the cold circulation pipes 8 are connected in communication with the heat transfer seat 9, the diversion box body 3 and the reflux assembly.

[0073] Embodiment 3:

[0074] This embodiment provides a molded case circuit breaker that is convenient for heat dissipation. In addition to including the technical solutions of the above embodiment, it also has the following technical features.

[0075] The reflux component includes a main body 11, a liquid injection box 12 is connected to the upper end of the main body 11 in a communicating manner, a driving motor 13 is provided at the lower end of the main body 11, a reflux paddle wheel 14 is provided at a position corresponding to the heat circulation pipe 7 inside the main body 11, and the reflux paddle wheel 14 is fixedly connected to the output end of the driving motor 13. The liquid injection box 12 is arranged on the main body 11, and coolant is added to the entire circulation system through the liquid injection box 12. The driving motor 13 is arranged at the lower end of the main body 11 to provide power for the reflux paddle wheel 14 through the driving motor 13, and the reflux paddle wheel 14 provides power for the circulation of the coolant.

[0076] Example 4:

[0077] This embodiment provides a plastic case circuit breaker that is convenient for heat dissipation. In addition to including the technical solutions of the above embodiments, it also has the following technical features.

[0078] The fixed frame is fixedly connected to the two transfer box bodies 3 through bolts. Fixing screws are provided on the outer surface of the side of the fixed frame away from the heat transfer seat 9. By arranging the fixing screws at the inner end of the fixed frame, the fixed frame is arranged on the plastic case circuit breaker.

[0079] Example 5:

[0080] This embodiment provides a plastic case circuit breaker that is convenient for heat dissipation. In addition to including the technical solutions of the above embodiments, it also has the following technical features.

[0081] A connecting threaded hole 15 is penetrated through the heat transfer seat 9 and between the two heat transfer cavities 10. The heat transfer seat 9 is fixedly arranged on the surface of the plastic case circuit breaker by passing a bolt through the connecting threaded hole 15, and it is ensured that the heat transfer seat 9 is in contact with the position that needs to be dissipated.

[0082] 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 belong to the protection scope of the present application.

Claims

1. A plastic case circuit breaker facilitating heat dissipation, characterized in that, Comprising: A housing, which includes a mounting base (1) and a cover plate (2). The mounting base (1) and the cover plate (2) form a mounting cavity, in which a contact system, an operating mechanism, a release device and a spring system are installed; A heat dissipation component is provided on the rear end face of the mounting base (1); The heat dissipation component includes: A transfer box body (3). The number of the transfer box bodies (3) is two. An overcurrent pipeline (4) is connected in a communicating manner between the two transfer box bodies (3). A heat sink (5) is provided outside the overcurrent pipeline (4) and between the two transfer box bodies (3). A fixing frame (6) is provided between the upper and lower ends of the two transfer box bodies (3). A reflux component is provided at the outer end of one of the transfer box bodies (3). The input end of the reflux component is connected in a communicating manner to one end of a heat circulation pipe (7). The other end of the heat circulation pipe (7) is provided with a heat transfer seat (9). The other side of the heat transfer seat (9) is connected in a communicating manner to a cold circulation pipe (8). A heat transfer cavity (10) is formed at a position corresponding to the heat circulation pipe (7) and the cold circulation pipe (8) inside the heat transfer seat (9).

2. The plastic case circuit breaker according to claim 1, which is characterized in that, The number of the heat circulation pipe (7), the cold circulation pipe (8) and the heat transfer cavity (10) is two sets. Each set of the heat circulation pipe (7), the cold circulation pipe (8) and the heat transfer cavity (10) is arranged in isolation from each other. Connection ends are provided at positions corresponding to the heat circulation pipe (7) and the cold circulation pipe (8) on the heat transfer seat (9), the transfer box body (3) and the reflux component. The heat circulation pipe (7) and the cold circulation pipe (8) are connected to the connection ends by plugging.

3. The molded case circuit breaker for facilitating heat dissipation according to claim 1, wherein The reflux component includes a main body (11). A liquid injection box (12) is connected in a communicating manner to the upper end of the main body (11). A driving motor (13) is provided at the lower end of the main body (11). A reflux paddle wheel (14) is provided inside the main body (11) at a position corresponding to the heat circulation pipe (7). The reflux paddle wheel (14) is fixedly connected to the output end of the driving motor (13). The liquid injection box (12) is provided on the main body (11).

4. The plastic case circuit breaker facilitating heat dissipation according to claim 1, wherein, The fixing frame is fixedly connected to the two transfer box bodies (3) by bolts. Fixing screws are provided on the outer surface of one side of the fixing frame away from the heat transfer seat (9).

5. The plastic case circuit breaker facilitating heat dissipation according to claim 1, wherein A connecting threaded hole (15) is provided through the heat transfer seat (9) and between the two heat transfer cavities (10).

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