Circuit breaker contact heat dissipation device
By combining water cooling and fan cooling, the problem of overheating of large circuit breaker contacts is solved, achieving efficient active heat dissipation and ensuring stable operation of the circuit breaker under high load conditions.
Patent Information
- Application Number
- CN202423178940.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2025-11-18
- Estimated Expiration
- 2034-12-23
AI Technical Summary
In high-load and frequent power fluctuation environments, traditional passive air cooling is inefficient for large circuit breaker contacts, leading to overheating and affecting normal operation and performance.
It adopts a cooling component with water cooling function, including an external cooling pipe, an internal cooling pipe and a storage chamber. The impeller driven by the motor forms a circulating coolant flow, which, combined with the fan, achieves active heat dissipation, enhances thermal conductivity and airflow.
It achieves efficient active heat dissipation, reduces contact temperature, avoids the effects of overheating, and improves the working stability and reliability of the circuit breaker.
Smart Images
Figure CN223566451U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a heat dissipation device, more particularly to a circuit breaker contact heat dissipation device. BACKGROUND
[0002] The circuit breaker contact is usually made of a conductor material and is used to transmit current when the circuit breaker is turned off or turned on. It is a key part for contacting and isolating the circuit in the circuit breaker and ensures the normal realization of the circuit function. However, the circuit breaker consumes a large amount of energy in the working process, and most of the energy is converted into heat energy, which causes the temperature of the contact to rise. If the heat is not dissipated in time, the contact may overheat, thereby affecting its normal work and performance. In order to ensure the heat dissipation performance, a large number of heat dissipation holes are usually arranged at the installation position of the contact. However, in the actual use, it is found that in the heavy load environment such as factories and manufacturing industries, the power demand is large and fluctuates frequently. Large contacts are used to provide stable power supply, thereby effectively protecting large motors and equipment. Large circuit breakers such as 1600A frame circuit breakers and vacuum circuit breaker plunger contacts are used. However, the contact of such a large circuit breaker is large. The traditional air cooling is passive cooling, and the effect is poor. Therefore, a circuit breaker contact heat dissipation device is needed. The device has a component with active heat dissipation function, thereby efficiently dissipating heat and avoiding the influence of high temperature on normal operation.
[0003] In view of the above reasons, how to set a component with active heat dissipation function is the problem considered by the present application. CONTENT OF THE UTILITY MODEL
[0004] In view of the deficiencies in the prior art, a circuit breaker contact heat dissipation device is provided. The device has an active heat dissipation function.
[0005] To achieve the above purpose, the following technical scheme is provided: a circuit breaker contact heat dissipation device, comprising a shell, a fixing assembly, a connecting assembly, and a cooling assembly. The fixing assembly and the connecting assembly are both installed inside the shell. The surface of the shell is provided with an opening. The cooling assembly is installed inside the shell and is located at the opening. The connecting assembly comprises a connecting pipe. The circuit breaker contact is arranged in the connecting pipe. The cooling assembly comprises a fixed shell, a motor, an impeller, an outer cooling pipe, and an inner cooling pipe. The fixed shell is provided with a storage bin for containing cooling liquid. The impeller is installed in the storage bin and is connected with the motor. The storage bin is communicated with the inner cooling pipe. The inner cooling pipe is communicated with the outer cooling pipe. The outer cooling pipe wraps the connecting pipe.
[0006] In summary, the technical scheme has the following beneficial effects: Since the heating part is mainly concentrated in the circuit breaker contact, and the circuit breaker contact is arranged in the connecting pipe, the connecting pipe is the focus of heat dissipation. In order to ensure the operation effect, the large circuit breaker contact is usually wound with more coils, and the coils are close to each other, which has a complex structure, resulting in low air flow rate and low passive heat dissipation efficiency. In order to improve the heat dissipation effect, the connecting pipe is wrapped with an outer cooling pipe. The outer cooling pipe has good heat conduction performance, and can effectively absorb the heat generated when in contact with the connecting pipe. The outer cooling pipe, the inner cooling pipe and the storage bin are in communication with each other, and the cooling liquid is arranged inside. The heat generated by the circuit breaker contact is absorbed by the outer cooling pipe and then absorbed by the cooling liquid. Under the condition that the impeller is driven to rotate by the motor, the fixed shell forms a structure similar to a water pump, and the cooling liquid flows and circulates continuously, continuously taking away the heat, thereby achieving the purpose of heat dissipation. The cooling liquid can be cooled when circulating into the inner cooling pipe and the storage bin, and the impeller can also maintain the continuous circulation of the cooling liquid, thereby achieving the purpose of active heat dissipation.
[0007] Since the large circuit breaker usually has a fixed installation position, the shell mainly plays a protective role when it is not installed. The fixing assembly is used to cooperate with the installation of the circuit breaker. The shell can be directly discarded when installed, or punched for the circuit breaker contact to pass through.
[0008] The resistance is the main reason for temperature rise. When the continuous current passes, the head itself will heat due to the resistance, and the temperature rise of the contact will cause the resistance to further increase. Or when the load of the circuit breaker is too large, the resistance of the contact will increase, which will cause irreversible circulation and continuous temperature rise. Therefore, an additional active heat dissipation function is needed.
[0009] In addition, poor contact of the contact is another important factor causing temperature rise of the contact. Poor contact may be caused by dirt on the surface of the contact, which causes additional resistance when the current passes, thereby generating heat. Therefore, the circuit breaker contact is arranged in the connecting pipe, and the connecting pipe has a certain isolation effect.
[0010] The prior art usually adopts a contact provided with a large number of ventilation holes, so as to increase the speed of internal air flow to dissipate heat. This passive heat dissipation method mainly relies on air convection. The connecting part in the contact of the large circuit breaker is connected closely to ensure the operation effect, and the space left for air convection is small. In addition, the circuit breaker is usually placed in a relatively closed environment, and the speed of air convection will also be reduced, thereby causing low passive heat dissipation efficiency. The cooling assembly with water cooling function is adopted in the utility model, and the heat is quickly transferred by relying on the good heat conduction effect of the cooling liquid, thereby achieving the purpose of active heat dissipation. BRIEF DESCRIPTION OF DRAWINGS
[0011] Figure 1 Fig. 1 is a perspective view of the circuit breaker contact heat dissipation device;
[0012] Figure 2 Fig. 2 is a perspective view of the internal structure of the circuit breaker contact heat dissipation device;
[0013] Figure 3 Fig. 3 is a sectional view of the circuit breaker contact heat dissipation device;
[0014] Figure 4 Fig. 4 is a side sectional view of the second transmission shaft of the circuit breaker contact heat dissipation device;
[0015] Figure 5 Fig. 5 is a side sectional view of the third transmission shaft of the circuit breaker contact heat dissipation device.
[0016] Reference signs: 1, housing; 2, fixed assembly; 3, connecting assembly; 4, mounting; 5, elastic pad; 6, cooling assembly;
[0017] 11, opening;
[0018] 31, connecting pipe; 32, elastic heat conducting pipe;
[0019] 61, fixed shell; 62, motor; 63, impeller; 64, outer cooling pipe; 65, inner cooling pipe; 66, heat dissipation channel; 67, heat dissipation guide pipe;
[0020] 611, storage bin; 612, containing bin; 613, first transmission shaft; 614, first bevel gear; 615, second bevel gear; 616, second transmission shaft; 617, third transmission shaft; 618, fan; 619, third bevel gear. DETAILED DESCRIPTION
[0021] The utility model will be further explained in detail below by combining with the drawings and examples. Same parts are indicated by same reference signs. It should be noted that the words "front", "back", "left", "right", "up" and "down" used in the following description refer to the directions in the drawings, and the words "bottom surface" and "top surface", "inner" and "outer" refer to the directions towards or away from the geometric center of a specific part.
[0022] Reference Figures 1-5As shown, the circuit breaker contact heat dissipation device includes a housing 1, a fixing component 2, a connecting component 3, and a cooling component 6. The fixing component 2 and the connecting component 3 are both installed inside the housing 1. The surface of the housing 1 is provided with an opening 11. The cooling component 6 is installed inside the housing 1 and is located at the opening 11. The connecting component 3 includes a connecting pipe 31. The circuit breaker contacts are located inside the connecting pipe 31. The cooling component 6 includes a fixing housing 61, a motor 62, an impeller 63, an outer cooling pipe 64, and an inner cooling pipe 65. The fixing housing 61 is provided with a storage chamber 611 for containing coolant. The impeller 63 is installed inside the storage chamber 611 and connected to the motor 62. The storage chamber 611 is connected to the inner cooling pipe 65. The inner cooling pipe 65 is connected to the outer cooling pipe 64. The outer cooling pipe 64 wraps around the connecting pipe 31.
[0023] Since the heat generation is mainly concentrated in the circuit breaker contacts, which are located inside the connecting pipe 31, the connecting pipe 31 is the key area for heat dissipation. Large circuit breaker contacts typically have numerous coils wound around them to ensure operational efficiency, and these coils are close together, resulting in a complex structure and low airflow, thus leading to low passive heat dissipation efficiency. To improve heat dissipation, an external cooling pipe 64 is used to wrap the connecting pipe 31. The external cooling pipe 64 itself has good thermal conductivity, and its contact with the connecting pipe 31 effectively removes the generated heat. The external cooling pipe 64 and the internal cooling pipe 6... 5 and storage chamber 611 are interconnected and contain coolant. The heat generated by the circuit breaker contacts is conducted to the connecting pipe 31 and absorbed by the external cooling pipe 64, and then absorbed by the coolant. When the motor 62 drives the impeller 63 to rotate, a pump-like structure is formed inside the fixed shell 61. The coolant will continuously flow and circulate, continuously carrying away heat, thereby achieving the purpose of heat dissipation. The coolant can be cooled when it enters the internal cooling pipe 65 and storage chamber 611 during circulation. At the same time, the impeller 63 can also maintain the continuous circulation of coolant, thereby achieving the purpose of active heat dissipation.
[0024] Since large circuit breakers usually have fixed installation positions, the housing 1 mainly serves a protective function when not installed. The fixing component 2 is used to cooperate with the installation of the circuit breaker. The housing 1 can be discarded directly during installation, or holes can be drilled for the circuit breaker contacts to pass through.
[0025] Resistance is the main cause of temperature rise. When a continuous current passes through, the resistance of the lead itself will generate heat. In addition, the temperature of the contacts will increase, which will further increase their resistance. Or when the circuit breaker is overloaded, the contact resistance will increase. These factors will create an irreversible cycle that causes the temperature to continue to rise. Therefore, an additional active cooling function is required.
[0026] In addition, the poor contact of the contact is another important factor leading to the temperature rise of the contact, and the poor contact can be caused by the dirty surface of the contact, etc., so that the current generates additional resistance when passing through, thereby generating heat, and therefore the circuit breaker contact is arranged in the connecting pipe 31, and the connecting pipe 31 has a certain isolation effect;
[0027] The prior art usually adopts a contact provided with a large number of ventilation holes, so as to increase the speed of internal air circulation to dissipate heat, and this passive heat dissipation mode mainly relies on the convection of internal and external air; the connecting part in the contact of the large circuit breaker is connected tightly to ensure the operation effect, and the space left for air convection is small, and in addition, the circuit breaker is usually placed in a relatively closed environment, so that the speed of air convection is also reduced, thereby resulting in low passive heat dissipation efficiency; the utility model adopts the cooling assembly 6 with the water cooling function, relies on the good heat conduction effect of the cooling liquid to quickly transfer heat, and thereby achieves the purpose of active heat dissipation.
[0028] Further, the connecting pipe 31 is fixedly connected with the elastic heat conducting pipe 32 fixedly connected with the outer cooling pipe 64;
[0029] Although the direct contact of the connecting pipe 31 and the outer cooling pipe 64 can dissipate heat more effectively, the outer cooling pipe 64 is directly connected with the motor 62, and the motor 62 is easy to vibrate during operation; in order to prevent the vibration from causing poor contact of the circuit breaker contact, the elastic heat conducting pipe 32 is arranged to fill the gap between the connecting pipe 31 and the outer cooling pipe 64, and the vibration is alleviated by elasticity; in addition, since the elastic heat conducting pipe 32 has no hardness requirement, a material with higher heat conductivity can be used.
[0030] Further, the fixed shell 61 further has the containing bin 612, the motor 62 is connected with the first transmission shaft 613, the first transmission shaft 613 is fixedly connected with the first bevel gear 614 arranged in the containing bin 612, the first bevel gear 614 is meshingly connected with the second bevel gear 615 arranged in the containing bin 612, and the second bevel gear 615 is fixedly connected with the second transmission shaft 616 rotatably connected with the fixed shell 61 and fixedly connected with the impeller 63;
[0031] The fixed shell 61 further has the heat dissipation channel 66, and the fixed shell 61 is further fixedly connected with the heat dissipation guide pipe 67 arranged in the heat dissipation channel 66; part of the inner cooling pipe 65 is arranged in the heat dissipation channel 66 and wound on the heat dissipation guide pipe 67;
[0032] The water-cooled heat dissipation mode is to better dissipate heat, and although the heat circulation can be accelerated by the flowing cooling water to effectively reduce the temperature at the coil, the heat dissipation efficiency of the cooling liquid itself is still limited as a whole, and therefore the heat dissipation guide pipe 67 is provided, since there is no high hardness requirement, the heat dissipation guide pipe 67 can be made of a material with a much higher thermal conductivity than the inner cooling pipe 65, a part of the inner cooling pipe 65 is wound around the heat dissipation guide pipe 67, thereby increasing the actual heat dissipation area, which can effectively increase the heat dissipation efficiency, and the cooling liquid circulation is realized by the rotating impeller 63, which can quickly circulate the low-temperature cooling liquid, thereby improving the heat dissipation efficiency of the connecting pipe 31.
[0033] Further, the fixed shell 61 is further rotationally connected with a third transmission shaft 617, the third transmission shaft 617 is fixedly connected with a third bevel gear 619 meshed with the first bevel gear 614 and a fan 618 arranged outside the fixed shell 61.
[0034] After the motor 62 is started, the fan 618 can rotate together with the impeller 63, so that the water cooling and air cooling modes can be started at the same time, the fan 618 accelerates the air flow speed during rotation, on the one hand, the outer cooling pipe 64 can simultaneously dissipate heat to the cooling liquid away from the connecting pipe 31, and the air can also flow through the gap of the outer cooling pipe 64, thereby accelerating the external heat dissipation effect, on the other hand, the air flow speed in the heat dissipation guide pipe 67 will also increase, thereby accelerating the heat dissipation efficiency of the inner cooling pipe 65, both of which can effectively improve the overall heat dissipation efficiency, and the rotation of the fan 618 also belongs to the active heat dissipation mode, which is not restricted by the external environment.
[0035] In addition, the two bevel gears and the two transmission shafts are arranged to control the impeller 63 and the fan 618 respectively, which can prevent the impeller 63 or the fan 618 from being unable to operate normally when a problem occurs at one of them, thereby avoiding the situation that both of them are overheated when problems occur at the same time.
[0036] Further, the fixed assembly 2 comprises a mounting member 4, the mounting member 4 is fixedly connected with the connecting pipe 31.
[0037] The mounting member 4 is used for clamping various mounting devices, and plays the role of a connection medium, so that direct installation on the connecting pipe 31 can be avoided, and damage to the connecting pipe 31 caused by excessive force of the mounting device can be prevented.
[0038] Further, the fixed assembly 2 further comprises an elastic pad 5, the elastic pad 5 is fixedly connected with the mounting member 4 and abuts against the outer cooling pipe 64.
[0039] Since the outer cooling pipe 64 is directly connected with the motor 62, the motor 62 is prone to vibrate during operation, in order to prevent the outer cooling pipe 64 from being damaged due to collision with the mounting member 4 during vibration, the elastic pad 5 is arranged for buffering.
[0040] The above merely describes preferred embodiments of the present application, and the protection scope of the present application is not limited to the above-mentioned embodiments. Any technical solution falling within the concept of the present application shall fall within the protection scope of the present application. It should be noted that, for ordinary skilled persons in the art, some improvements and refinements without departing from the principles of the present application shall also be considered as falling within the protection scope of the present application.
Claims
1. A circuit breaker contact heat sink device, characterized by, The application relates to a circuit breaker, which comprises a shell, a fixing assembly, a connecting assembly and a cooling assembly, the fixing assembly and the connecting assembly are arranged in the shell, the shell is provided with an opening, the cooling assembly is arranged in the shell and located at the opening, the connecting assembly comprises a connecting pipe, a circuit breaker contact is arranged in the connecting pipe, the cooling assembly comprises a fixing shell, a motor, an impeller, an outer cooling pipe and an inner cooling pipe, a storage bin for containing cooling liquid is arranged in the fixing shell, the impeller is arranged in the storage bin and connected with the motor, the storage bin is communicated with the inner cooling pipe, the inner cooling pipe is communicated with the outer cooling pipe, and the outer cooling pipe wraps the connecting pipe.
2. The circuit breaker contact heat sink apparatus of claim 1, wherein, The connecting pipe is fixedly connected with an elastic heat-conducting pipe which is fixedly connected with the outer cooling pipe.
3. The circuit breaker contact heat sink apparatus of claim 1, wherein, The fixing shell is further provided with a containing bin, the motor is connected with a first transmission shaft, the first transmission shaft is fixedly connected with a first bevel gear arranged in the containing bin, the first bevel gear is in meshing connection with a second bevel gear arranged in the containing bin, the second bevel gear is fixedly connected with a second transmission shaft which is rotationally connected with the fixing shell and fixedly connected with the impeller.
4. The circuit breaker contact heat sink apparatus of claim 1, wherein, The fixing shell is further provided with a heat dissipation channel, the fixing shell is further fixedly connected with a heat dissipation guide pipe arranged in the heat dissipation channel, and part of the inner cooling pipe is arranged in the heat dissipation channel and wound around the heat dissipation guide pipe.
5. The circuit breaker contact heat sink apparatus of claim 3, wherein, The fixing shell is further rotationally connected with a third transmission shaft, the third transmission shaft is fixedly connected with a third bevel gear in meshing connection with the first bevel gear and a fan arranged outside the fixing shell.
6. The circuit breaker contact heat sink apparatus of claim 1, wherein, The fixing assembly comprises a mounting piece which is fixedly connected with the connecting pipe.
7. The circuit breaker contact heat sink apparatus of claim 6, wherein, The fixing assembly further comprises an elastic pad which is fixedly connected with the mounting piece and abuts against the outer cooling pipe.