Low-voltage capacity-enhancing motor bridge air-cooling unit

Abstract

This utility model relates to a bridge-type air-cooled device for low-voltage capacity-enhancing motors, belonging to the field of motor technology. It solves the technical problems of existing backpack-type cooling solutions, which rely on independent fans and air-to-water heat exchangers, require additional modifications to the water system by the customer, and suffer from high manufacturing and operating costs and low efficiency. The solution is a bridge-type air-cooled device for low-voltage capacity-enhancing motors, comprising: symmetrically arranged ventilation holes on both sides of the top of the motor base (shaft extension end and non-shaft extension end); a rotating shaft; an air gap between the wound stator core and the cast aluminum rotor; a centrifugal fan; an external fan; a junction box; a bridge-type air-cooling component located on the top of the motor base to the right of the junction box for heat exchange inside and outside the motor base; and an air guide component located outside the external fan and to the right of the bridge-type air-cooling component. Compared with existing technologies, this utility model has advantages such as high heat dissipation efficiency, low manufacturing and operating costs, and a balance between cooling and protection performance.

Description

Technical Field

[0001] This utility model belongs to the field of motor technology, specifically relating to a bridge-type air-cooled device for low-voltage capacity-enhancing motors. Background Technology

[0002] Low-voltage capacity-increased motors refer to motors with rated voltages below 1000V that meet higher demands by increasing capacity. In recent years, with the increasing application demand for low-voltage capacity-increased motors at industrial frequencies, the market has placed higher requirements on motors with self-fan cooling (IC411), IP55 protection rating, and high-efficiency operation. While these motors exhibit excellent performance, they still face bottlenecks in temperature rise control, which is a key factor limiting further increases in power density. Traditional methods for addressing temperature rise mainly involve increasing the core length or expanding the conductor cross-sectional area. However, this not only increases manufacturing costs and material usage but also reduces the product's economic viability and market competitiveness.

[0003] While existing backpack-style cooling solutions can address the temperature rise issue to some extent, they rely on separate auxiliary fans and air-to-water heat exchangers, significantly increasing the manufacturing and operational costs of low-voltage motors. Furthermore, air-to-water heat exchangers require modifications to the water system, adding extra costs, resulting in low efficiency and reduced product usability and market competitiveness. Moreover, this backpack-style cooling solution cannot meet the cooling requirements of self-ventilated low-voltage, high-capacity motors with extended operating frequencies. Utility Model Content

[0004] In order to overcome the shortcomings of existing technologies and solve the technical problems of existing backpack-type cooling solutions, such as relying on independent fans and air-water heat exchangers, requiring customers to make additional modifications to the water system, high manufacturing costs, high operating costs, and low efficiency, this utility model provides a low-voltage capacity-enhancing motor bridge air-cooling device.

[0005] This utility model is achieved through the following technical solution.

[0006] This utility model provides a low-voltage capacity-enhancing motor bridge air-cooling device, comprising: A machine base, which is connected to the shaft extension end cover and the non-shaft extension end cover respectively. The top two sides of the machine base are respectively provided with shaft extension end ventilation holes and non-shaft extension end ventilation holes. A rotating shaft is located in the middle of the inner cavity of the machine base; Cast aluminum rotor; The stator core has windings, and there is an air gap between the winding stator core and the cast aluminum rotor. A centrifugal fan, wherein the centrifugal fan is sleeved on a rotating shaft and located between a cast aluminum rotor and a shaft extension end cap; An external fan is mounted on the rotating shaft and located outside the non-shaft extension end cap. A junction box, located at the top of the shaft extension end of the machine base; A bridge-type air-cooled assembly is located on the top of the base, on the right side of the junction box, and is used for heat exchange inside and outside the base. An air guide assembly is located on the outside of the external fan and on the right side of the bridge-type air-cooling assembly to guide the airflow direction.

[0007] Furthermore, the angle between the line connecting the shaft extension end ventilation hole, the non-shaft extension end ventilation hole and the rotating shaft and the center line of the machine base is 45°.

[0008] Furthermore, the bridge-type air-cooling assembly has an arch bridge structure, comprising an arch bridge-type air-cooling cavity and two trapezoidal air-cooling cavities. The two trapezoidal air-cooling cavities are symmetrically arranged on the lower inner side of the arch bridge-type air-cooling cavity and communicate with it. The two trapezoidal air-cooling cavities and the arch bridge-type air-cooling cavity are attached to the heat dissipation fins of the base. The bottom plate of the trapezoidal air-cooling cavity is provided with bottom plate ventilation holes corresponding one-to-one with the ventilation holes at the shaft extension end and the ventilation holes at the non-shaft extension end. Several air-cooling pipes are evenly distributed inside the arch bridge-type air-cooling cavity and the two trapezoidal air-cooling cavities.

[0009] Furthermore, the arch-shaped air-cooled cavity is provided with a groove, and a through hole for the lifting ring is provided in the groove for the lifting ring to pass through.

[0010] Furthermore, the air-cooled pipe is provided with several limiting plates.

[0011] Furthermore, the air guiding assembly includes a fan cover, an air guide cover, and a baffle. The fan cover is a cylindrical structure with one end open. The fan cover is fitted onto the outside of the outer fan, and an air guide port is provided at the top of the fan cover. The air guide cover is located at the top of the air guide port, and the baffle is vertically located on the right side of the air guide port. The air guide cover and the baffle form an air guiding cavity. The air guiding cavity has an arch bridge structure and is connected to the arch bridge air cooling cavity and the two trapezoidal air cooling cavities. A streamlined guide plate is also provided inside the air guiding cavity at the air guide port.

[0012] Furthermore, the heat exchange inside the base is achieved by a centrifugal fan driving the hot air inside the base cavity to enter the bridge-type air-cooling assembly through the ventilation hole at the shaft extension end, and then flowing over the surface of the air-cooling pipe for cooling. The cooled air then re-enters the non-shaft extension end of the base cavity through the ventilation hole at the non-shaft extension end, where it absorbs the heat emitted from the base cavity and heats up. The heated air then flows back to the shaft extension end of the base cavity through the air gap.

[0013] Furthermore, the external heat exchange of the base is achieved by the external fan rotating to drive cold air into the air guide assembly, which then flows into the bridge-type air-cooling assembly through the streamlined guide plate. The cold air flows into the air-cooling pipe, absorbs the hot air flowing out of the base cavity from the outer surface of the air-cooling pipe, and is then discharged.

[0014] The beneficial effects achieved by this utility model are as follows: By integrating the bridge-type air-cooling component and the air-guiding component, this utility model eliminates the need for independent fans and air-water heat exchangers, and eliminates the need for additional modifications to the water system. It creatively combines the dual mechanisms of internal and external heat exchange within the frame to efficiently achieve heat exchange, solving the problem of excessive temperature rise in the windings within the frame, improving heat dissipation efficiency, and reducing costs. At the same time, through the bridge-type air-cooling component and the air-guiding component, the motor design can fully utilize the margin of motor starting and running performance while ensuring performance and reliability. This reduces the amount of copper wire and silicon steel sheets used, saving materials and reducing the manufacturing cost of the motor. In addition, the bridge-type air-cooling component ensures that the motor as a whole can still maintain a high IP55 protection rating, improving cooling performance without sacrificing protection capabilities.

[0015] Compared with the prior art, this utility model has the advantages of high heat dissipation efficiency, low manufacturing and usage costs, and a balance between cooling and protection performance. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the structure of the base of this utility model; Figure 3 This is a schematic diagram of the structure of the bridge-type air-cooled assembly of this utility model; Figure 4 This is a schematic diagram of the internal structure of the bridge-type air-cooled component of this utility model; Figure 5 This is a structural schematic diagram of the air guide assembly of this utility model; Figure 6 This is a schematic diagram of the fan cover of this utility model; Figure 7 This is an airflow diagram of this utility model.

[0017] In the diagram: 1. Base; 2. Shaft extension end cover; 3. Non-shaft extension end cover; 4. Shaft extension end ventilation hole; 5. Non-shaft extension end ventilation hole; 6. Shaft; 7. Cast aluminum rotor; 8. Winded stator core; 9. Air gap; 10. Centrifugal fan; 11. External fan; 12. Junction box; 13. Bridge-type air-cooling assembly; 14. Air guide assembly; 15. Arch bridge-type air-cooling cavity; 16. Trapezoidal air-cooling cavity; 17. Heat dissipation fins; 18. Bottom plate ventilation hole; 19. Air-cooling pipe; 20. Groove; 21. Lifting ring through hole; 22. Lifting ring; 23. Limiting plate; 24. Fan cover; 25. Air guide cover; 26. Baffle; 27. Air guide outlet; 28. Air guide cavity; 29. ​​Streamlined guide plate. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0019] like Figures 1 to 7 As shown, the low-voltage capacity-enhancing motor bridge air-cooling device includes: The base 1 is connected to the shaft extension end cover 2 and the non-shaft extension end cover 3 respectively. The top two sides of the base 1 are respectively provided with shaft extension end ventilation holes 4 and non-shaft extension end ventilation holes 5. Rotating shaft 6, which is located in the middle of the inner cavity of the machine base 1; Cast aluminum rotor 7; The stator core 8 has windings, and there is an air gap 9 between the stator core 8 and the cast aluminum rotor 7. Centrifugal fan 10, which is sleeved on the rotating shaft 6 and located between the cast aluminum rotor 7 and the shaft extension end cover 2; External fan 11, the external fan 11 is sleeved on the rotating shaft 6 and located outside the non-shaft extension end cover 3; Junction box 12, the junction box 12 is located at the top of the shaft extension end of the base 1; Bridge-type air-cooled assembly 13, which is located on the top of the base 1 and to the right of the junction box 12, is used for internal heat exchange and external heat exchange of the base 1. The air guide assembly 14 is located outside the external fan 11 and to the right of the bridge-type air-cooling assembly 13 to guide the airflow direction.

[0020] Specifically, the ventilation holes 4 at the shaft extension end and 5 at the non-shaft extension end provide a channel for heat exchange between the air inside the housing 1 and the air in the bridge-type air-cooling assembly 13. The air gap 9 allows air from the non-shaft extension end of the housing 1 to flow to the shaft extension end, achieving air circulation within the housing 1. The centrifugal fan 10 generates high pressure at its outlet and negative pressure at its inlet, blowing air out from the centrifugal fan 10. The air blown out by the external fan 11 is used to reduce the temperature inside the housing 1. By integrating the bridge-type air-cooling assembly 13 and the air guide assembly 14, it eliminates the need for independent fans and air-water heat exchangers, and avoids additional modifications to the water system. It creatively combines internal and external heat exchange mechanisms within the housing 1 to efficiently achieve heat exchange, solving the problem of excessive temperature rise inside the housing 1, improving heat dissipation efficiency, and reducing costs. Furthermore, the bridge-type air-cooling assembly 13 ensures that the motor as a whole maintains a high IP55 protection rating, improving cooling performance without sacrificing protection capabilities.

[0021] The angle between the line connecting the ventilation hole 4 at the shaft extension end, the ventilation hole 5 at the non-shaft extension end, and the rotating shaft 6 and the center line of the base 1 is 45°.

[0022] Specifically, the 45° angle setting is mainly based on the shape of the motor base 1 itself. The shaft extension end ventilation hole 4 and the non-shaft extension end ventilation hole 5 are set on both sides of the original nameplate position of the base 1 to reduce the modification cost.

[0023] The bridge-type air-cooling assembly 13 has an arch bridge structure. The bridge-type air-cooling assembly 13 includes an arch bridge-type air-cooling cavity 15 and two trapezoidal air-cooling cavities 16. The two trapezoidal air-cooling cavities 16 are symmetrically arranged on the lower inner side of the arch bridge-type air-cooling cavity 15 and are connected to the arch bridge-type air-cooling cavity 15. The two trapezoidal air-cooling cavities 16 and the arch bridge-type air-cooling cavity 15 are attached to the heat dissipation fins 17 of the base 1. The bottom plate of the trapezoidal air-cooling cavity 16 is provided with bottom plate ventilation holes 18 that correspond one-to-one with the ventilation holes 4 at the shaft extension end and the ventilation holes 5 at the non-shaft extension end. A number of air-cooling pipes 19 are evenly distributed in the arch bridge-type air-cooling cavity 15 and the two trapezoidal air-cooling cavities 16.

[0024] Specifically, the arched structure of the bridge-type air-cooling assembly 13 facilitates its fit with the heat dissipation fins 17 and the shape of the base 1 surface. The bridge-type air-cooling assembly 13 is fixedly connected to the base 1 by bolts. The two trapezoidal air-cooling cavities 16 leave a certain space between the bridge-type air-cooling assemblies 13 for installing the junction box 12. Simultaneously, the trapezoidal air-cooling cavities 16 facilitate the placement of the bottom plate ventilation holes 18 according to the structure of the base 1, allowing for communication between the bridge-type air-cooling assembly 13 and the inner cavity of the base 1. The air-cooling pipe 19 is made of aluminum. The aluminum material improves the corrosion resistance of the air-cooling pipe 19, extends its service life, and also enhances its thermal conductivity, enabling rapid heat transfer.

[0025] The arch-shaped air-cooled cavity 15 is provided with a groove 20, and a lifting ring through hole 21 is provided at the groove 20 for the lifting ring 22 to pass through.

[0026] Specifically, the through hole 21 of the lifting ring can be used for the lifting ring 22 to pass through, which facilitates installation and disassembly and prevents interference between the bridge-type air-cooled assembly 13 and the lifting ring 22.

[0027] The air-cooled pipe 19 is provided with several limiting blocking plates 23.

[0028] Specifically, the setting of several limiting plates 23 is used to further fix and limit the air-cooling pipe 19, improve the stability of the bridge-type air-cooling assembly 13, and extend its service life.

[0029] The air guiding assembly 14 includes a fan cover 24, an air guide cover 25, and a baffle 26. The fan cover 24 is a cylindrical structure with one end open. The fan cover 24 is fitted on the outside of the outer fan 11, and the top of the fan cover 24 is provided with an air guide port 27. The air guide cover 25 is located on the top of the air guide port 27, and the baffle 26 is vertically located on the right side of the air guide port 27. The air guide cover 25 and the baffle 26 form an air guiding cavity 28. The air guiding cavity 28 has an arch bridge structure. The air guiding cavity 28 is connected to the arch bridge air cooling cavity 15 and the two trapezoidal air cooling cavities 16. A streamlined guide plate 29 is also provided inside the air guiding cavity 28 at the air guide port 27.

[0030] Specifically, the fan shroud 24 collects the air blown out by the external fan 11, which flows out from the air vent 27 and, guided by the air shroud 25 and baffle 26, enters the bridge-type air-cooling assembly 13 along the air duct 28. The streamlined air guide plate 29 causes the air to flow in a specific direction, reducing air resistance and improving the efficiency of airflow.

[0031] The heat exchange inside the base 1 is achieved by the centrifugal fan 10 rotating and driving the hot air inside the base 1 to enter the bridge-type air-cooling assembly 13 through the ventilation hole 4 at the shaft extension end. The air flows over the surface of the air-cooling pipe 19 and is cooled down. The cooled air re-enters the non-shaft extension end of the base 1 through the ventilation hole 5 at the non-shaft extension end. The cooled air absorbs the heat emitted from the inner cavity of the base 1 and heats up. The heated air flows back to the shaft extension end of the inner cavity of the base 1 through the air gap 9.

[0032] Specifically, the temperature rise generated in the inner cavity of the base 1 is cooled down by heat exchange on the surface of the air-cooled pipe 19, thereby reducing the temperature rise in the inner cavity of the base 1 and the temperature of the base 1.

[0033] The external heat exchange of the base 1 is driven by the rotation of the external fan 11, which drives the cold air to flow into the air guide assembly 14 and into the bridge air-cooling assembly 13 through the streamlined guide plate 29. The cold air flows into the air-cooling pipe 19, absorbs the hot air flowing out of the inner cavity of the base 1 from the outer surface of the air-cooling pipe 19, and then discharges it.

[0034] Specifically, external heat exchange continuously flows into the air-cooling pipe 19 from the base 1, thereby continuously cooling the air-cooling pipe 19 itself and ensuring that the air-cooling pipe 19 always has the ability to efficiently absorb the hot air flowing out of the inner cavity of the base 1. At the same time, the bridge-type air-cooling assembly 13 and the air guide assembly 14 are located at the top of the base 1, which can effectively guide and enhance the cooling airflow through the heat dissipation fins 17, improve the convective heat transfer efficiency of the heat dissipation fins 17, reduce the temperature of the base 1, and ultimately reduce the temperature rise of the inner cavity of the base 1.

[0035] Specifically, the external heat exchange of the frame 1 carries away the heat absorbed by the air-cooled pipe 19, while the heat generated inside the frame 1 continuously exchanges heat with the cold air inside the bridge-type air-cooled assembly 13. The two cooling methods are closely coupled and work together through the air-cooled pipe 19 to greatly improve heat dissipation efficiency and ultimately effectively reduce the temperature rise of the winding.

[0036] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, modifications can still be made to the embodiments. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A low-voltage capacity-enhancing motor bridge-type air-cooling device, characterized in that: include: The base (1) is connected to the shaft extension end cover (2) and the non-shaft extension end cover (3) respectively. The top two sides of the base (1) are respectively provided with shaft extension end ventilation holes (4) and non-shaft extension end ventilation holes (5). A rotating shaft (6) is located in the middle of the inner cavity of the machine base (1); Cast aluminum rotor (7); There is a wound stator core (8) and an air gap (9) between the wound stator core (8) and the cast aluminum rotor (7). Centrifugal fan (10), the centrifugal fan (10) is sleeved on the rotating shaft (6) and located between the cast aluminum rotor (7) and the shaft extension end cover (2); An external fan (11) is sleeved on the rotating shaft (6) and located outside the non-shaft extension end cap (3); Junction box (12), the junction box (12) is located at the top of the shaft extension end of the base (1); Bridge-type air-cooled assembly (13), which is located on the top of the base (1) and on the right side of the junction box (12) for heat exchange inside the base (1) and outside the base (1); The air guide assembly (14) is located outside the external fan (11) and to the right of the bridge-type air-cooling assembly (13) to guide the airflow direction.

2. The low-voltage capacity-enhancing motor bridge air-cooling device according to claim 1, characterized in that: The angle between the line connecting the ventilation hole (4) at the shaft extension end, the ventilation hole (5) at the non-shaft extension end, and the rotating shaft (6) and the center line of the base (1) is 45°.

3. The low-voltage capacity-enhancing motor bridge air-cooling device according to claim 2, characterized in that: The bridge-type air-cooling assembly (13) has an arch bridge structure. The bridge-type air-cooling assembly (13) includes an arch bridge-type air-cooling cavity (15) and two trapezoidal air-cooling cavities (16). The two trapezoidal air-cooling cavities (16) are symmetrically arranged on the lower inner side of the arch bridge-type air-cooling cavity (15) and are connected to the arch bridge-type air-cooling cavity (15). The two trapezoidal air-cooling cavities (16) and the arch bridge-type air-cooling cavity (15) are attached to the heat dissipation fins (17) of the base (1). The bottom plate of the trapezoidal air-cooling cavity (16) is provided with bottom plate ventilation holes (18) that correspond one-to-one with the ventilation holes (4) at the shaft extension end and the ventilation holes (5) at the non-shaft extension end. A number of air-cooling pipes (19) are evenly distributed in the arch bridge-type air-cooling cavity (15) and the two trapezoidal air-cooling cavities (16).

4. The low-voltage capacity-enhancing motor bridge air-cooling device according to claim 3, characterized in that: The arch-shaped air-cooled cavity (15) is provided with a groove (20), and a lifting ring through hole (21) is provided at the groove (20) for the lifting ring (22) to pass through.

5. The low-voltage capacity-enhancing motor bridge air-cooling device according to claim 4, characterized in that: The air-cooled pipe (19) is provided with several limiting plates (23).

6. The low-voltage capacity-enhancing motor bridge air-cooling device according to claim 5, characterized in that: The air guide assembly (14) includes a fan cover (24), an air guide cover (25), and a baffle (26). The fan cover (24) is a cylindrical structure with one end open. The fan cover (24) is fitted on the outside of the external fan (11). The top of the fan cover (24) is provided with an air guide port (27). The air guide cover (25) is located on the top of the air guide port (27). The baffle (26) is vertically located on the right side of the air guide port (27). The air guide cover (25) and the baffle (26) form an air guide cavity (28). The air guide cavity (28) has an arch bridge structure. The air guide cavity (28) is connected to the arch bridge air cooling cavity (15) and the two trapezoidal air cooling cavities (16). A streamlined guide plate (29) is also provided inside the air guide cavity (28) at the air guide port (27).

7. The low-voltage capacity-enhancing motor bridge air-cooling device according to claim 6, characterized in that: The heat exchange inside the base (1) is driven by the rotation of a centrifugal fan (10). The hot air inside the base (1) enters the bridge-type air-cooling component (13) through the ventilation hole (4) at the shaft extension end and flows through the surface of the air-cooling pipe (19) for cooling. The cooled air re-enters the non-shaft extension end of the base (1) through the ventilation hole (5) at the non-shaft extension end. The cooled air absorbs the heat emitted from the inner cavity of the base (1) and heats up. The heated air flows back to the shaft extension end of the inner cavity of the base (1) through the air gap (9).

8. The low-voltage capacity-enhancing motor bridge air-cooling device according to claim 7, characterized in that: The external heat exchange of the base (1) is driven by the rotation of the external fan (11) to flow into the air guide assembly (14) and into the bridge air cooling assembly (13) through the streamlined guide plate (29). The cold air flows into the air cooling pipe (19) and absorbs the hot air flowing out of the inner cavity of the base (1) from the outer surface of the air cooling pipe (19) and discharges it.

Images