A bearing cooling mechanism for a suspended blower

Abstract

The utility model provides a kind of bearing heat dissipation mechanism of suspension blower fan. Including motor casing, ventilation duct, rotor, stator coil and the first end cover and second end cover being equipped with in heat dissipation impeller motor casing two ends, inside is equipped with rotor along the axial direction, and the first magnetic bearing group, stator coil and second magnetic bearing group being sequentially arranged. Motor casing surface is equipped with exhaust pipe, between stator coil and second magnetic bearing group. Ventilation duct is spaced apart and located in the outside of motor casing, and two ends are respectively communicated with the two ends of motor casing. Heat dissipation impeller is installed in the outside of first end cover, and is coaxially connected with rotor. First end cover is equipped with air hole, second end cover is equipped with air equalization chamber, ventilation duct end is inserted into chamber, and chamber is equipped with multiple air outlets. The bearing heat dissipation mechanism of suspension blower fan of the application can cool the bearing components inside motor.

Description

Technical Field

[0001] This application relates to the field of suspended blowers, and more specifically, to a heat dissipation mechanism for a suspended blower bearing. Background Technology

[0002] A suspension blower is a machine that uses a high-speed rotating impeller to do work on gas, thereby increasing gas pressure and discharging the gas. Its core components typically include a drive motor and the blower body. The drive motor consists of a rotor and stator coils located within a motor housing, and its high-speed operation is supported by bearings.

[0003] During operation, the suspended blower mainly faces two heat generation problems: First, the motor itself generates heat due to losses, namely, copper losses and eddy current losses in the stator coil due to energization, and iron losses in the rotor due to rotation in the magnetic field. These losses eventually accumulate in the form of heat. Second, when the blower impeller compresses the air, it generates huge axial and radial forces. These forces are ultimately transmitted and act on the bearings supporting the rotor, causing the bearings to experience increased friction due to high loads, resulting in significant frictional heat.

[0004] The heat generated by both of these factors combined causes a sharp rise in bearing temperature. Excessively high operating temperatures accelerate the deterioration and failure of bearing grease, exacerbate bearing wear, significantly shorten its service life, and in more serious cases, may cause bearing seizure, burnout of motor winding insulation, and other faults, resulting in complete machine failure. Utility Model Content

[0005] This application provides a heat dissipation mechanism for a suspended blower bearing, which can dissipate heat from the bearing components inside the motor.

[0006] Specifically, this application is implemented through the following technical solution: This application provides a heat dissipation mechanism for a suspended blower bearing, comprising: The motor housing has a first end cover and a second end cover at its two ends, and the motor housing has a rotor arranged along its axis inside, and a first magnetic bearing assembly, a stator coil and a second magnetic bearing assembly arranged in sequence along the direction from the first end cover to the second end cover. The surface of the motor housing has an exhaust pipe that connects the inside and outside, and the exhaust pipe is located between the stator coil and the second magnetic bearing assembly. The stator coil is sleeved on the outer periphery of the rotor. Ventilation ducts are spaced apart on the outside of the motor housing, and the ventilation ducts extend axially and connect to both ends of the motor housing; A heat dissipation impeller is installed on the outside of the first end cover and coaxially connected to the rotor. The first end cover has multiple vent holes circumferentially opened on its edge, the exhaust pipe is located on the side of the stator coil away from the first end cover, the second end cover is provided with an air equalization chamber, the end of the ventilation pipe is inserted into the air equalization chamber, and the air equalization chamber is evenly provided with multiple air outlets. The heat dissipation impeller is configured to form a first air passage and a second air passage during operation. The first air passage enters the interior of the motor housing through the heat dissipation impeller, flows through the first magnetic bearing assembly and the gap between the rotor and the stator coil, and then exits from the exhaust pipe. The second air passage enters the ventilation duct through the vent hole, flows to the air equalization chamber and the second magnetic bearing assembly, enters the motor housing from the air outlet to cool the bearings, and then exits from the exhaust pipe.

[0007] Optionally, the plurality of air outlets of the air equalization chamber are disposed on the side wall of the air equalization chamber facing the first end cap; The air equalization chamber is provided with multiple guide vanes, which are arc-shaped and arranged at radial intervals, and the guide vanes are parallel to the direction of the airflow.

[0008] Optionally, the motor housing is further provided with a coolant chamber, which is arranged in a ring around the outer periphery of the stator coil facing away from the rotor. The coolant chamber has a coolant inlet and a coolant outlet for continuously supplying coolant.

[0009] Optionally, the ventilation duct is bent at both ends, with a first bend near the first end cover and a second bend near the second end cover. The first bend is an obtuse angle, and the opening of the first bend connecting to the motor housing is a flared shape with its size gradually decreasing along the airflow direction; The ventilation duct is covered with heat insulation material on the outside.

[0010] Optionally, a plurality of first guide vanes are fixed inside the first bend, and the cross-section of the first guide vanes is crescent-shaped. The second bend is provided with a plurality of second guide vanes, the outline of which is consistent with the inner wall of the bend.

[0011] Optionally, the outer periphery of the heat dissipation impeller is provided with an impeller cover, which is fixed to the first end cover and extends toward the outside of the housing; The impeller cover has a streamlined, tapering flared opening at its inlet end.

[0012] Optionally, the heat dissipation impeller extends into the inner side of the motor housing and is connected to a tail diffuser; The tail diffuser is a shell-shaped structure with openings at both ends. One end is installed with the heat dissipation impeller, and the area of ​​the other end opening is larger than the area of ​​the air outlet surface of the heat dissipation impeller.

[0013] Optionally, the sidewall of the motor housing is provided with multiple heat dissipation holes.

[0014] This application provides a cooling mechanism for a suspended blower bearing. Firstly, a first air path directly cools the core heat source. The airflow passes through the gap between the first magnetic bearing assembly, the stator coil, and the rotor, carrying away most of the heat. Secondly, a second air path is provided, which delivers unheated, low-temperature ambient air through an external ventilation duct, bypassing the main heat-generating area, directly to the second magnetic bearing assembly at the far end of the motor housing. The two airflow paths converge and are discharged at the exhaust duct. This design constitutes a collaborative cooling system, achieving overall and balanced heat dissipation within the motor housing. Furthermore, a uniform air distribution chamber evenly distributes the low-temperature air from the second air path, reducing dead zones and ensuring that cooling airflow is synchronously blown from each outlet, guaranteeing uniform cooling of the second magnetic bearing assembly and reducing the surrounding temperature difference. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of a suspended blower bearing heat dissipation mechanism shown in an exemplary embodiment of this application; Figure 2 This is an external schematic diagram of a suspended blower bearing heat dissipation mechanism shown in an exemplary embodiment of this application; Figure 3 This is a right view of a suspended blower bearing heat dissipation mechanism shown in an exemplary embodiment of this application; Figure 4 This is a cross-sectional view of the first end cap shown in an exemplary embodiment of this application; Figure 5 This is a schematic diagram of the interior of a ventilation duct shown in an exemplary embodiment of this application.

[0016] Wherein: 100, motor housing; 110, first end cover; 111, vent hole; 120, second end cover; 130, air distribution chamber; 131, exhaust pipe; 140, first magnetic bearing assembly; 150, second magnetic bearing assembly; 160, coolant chamber; 200, ventilation duct; 210, first bend; 211, first guide vane; 212, second guide vane; 220, second bend; 300, rotor; 400, stator coil; 500, heat dissipation impeller; 510, impeller cover; 520, tail diffuser; 600, heat dissipation tooth hole. Detailed Implementation

[0017] The technical solutions in the embodiments (or "implementations") of this application will be clearly and completely described herein with reference to the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0018] If the embodiments of this application contain terms relating to directional indications or positional relationships (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationships and movement of the components in a specific posture (as shown in the attached figures); if the specific posture changes, the directional indications or positional relationships will also change accordingly. Furthermore, the terms "first" and "second" used in the embodiments of this application are only for descriptive convenience and should not be construed as indicating or implying relative importance.

[0019] refer to Figure 1 , Figure 2 as well as Figure 3 This application provides a heat dissipation mechanism for a suspended blower bearing, including a motor housing 100, a ventilation duct 200, and a heat dissipation impeller 500. The motor housing 100 has a first end cover 110 and a second end cover 120 at its two ends. Inside the motor housing 100 is a rotor 300 arranged along its axis, and a first magnetic bearing assembly 140, a stator coil 400, and a second magnetic bearing assembly 150 are sequentially arranged along the direction from the first end cover 110 to the second end cover 120. An exhaust pipe 131 connecting the inside and outside of the motor housing 100 is provided on its surface, located between the stator coil 400 and the second magnetic bearing assembly 150. The stator coil 400 is sleeved on the outer periphery of the rotor 300. The ventilation duct 200 is spaced apart on the outside of the motor housing 100, extending axially and connecting both ends of the motor housing 100. The heat dissipation impeller 500 is mounted on the outside of the first end cover 110 and coaxially connected to the rotor 300. The first end cover 110 has multiple vent holes 111 circumferentially opened on its edge. The exhaust pipe 131 is located on the side of the stator coil 400 away from the first end cover 110. The second end cover 120 is provided with an air equalization chamber 130. The end of the ventilation pipe 200 is inserted into the air equalization chamber 130, and the air equalization chamber 130 has multiple air outlets evenly distributed. The cooling impeller 500 is configured to form a first air passage and a second air passage during operation. The first air passage enters the interior of the motor housing 100 through the cooling impeller 500, flows through the first magnetic bearing assembly 140 and the gap between the rotor 300 and the stator coil 400, and is discharged from the exhaust pipe 131. The second air passage enters the ventilation pipe 200 through the vent holes 111, flows to the air equalization chamber 130 and the second magnetic bearing assembly 150, enters the motor housing 100 through the air outlet to cool the bearings, and is discharged from the exhaust pipe 131.

[0020] The cooling impeller 500 rotates synchronously with the rotor 300 to draw in external gas. The ventilation duct 200 connects both ends of the motor housing 100, and its opening can be directly opposite the periphery where multiple vent holes 111 are located. The first magnetic bearing assembly 140 can control a radial magnetic bearing, and the second magnetic bearing assembly 150 can include an axial magnetic bearing and a radial magnetic bearing, with the axial magnetic bearing being closer to the stator coil 400.

[0021] If only a single air path is designed, the cooling airflow will be heated itself after flowing from the inlet through the high-temperature first magnetic bearing assembly 140, rotor 300, and stator coil 400. When this heated airflow finally reaches the far end of the motor housing 100 (the area of ​​the second end cover 120), the temperature difference between it and the target component (such as the second magnetic bearing assembly 150) is extremely small, or even higher than the bearing temperature, resulting in almost complete loss of cooling capacity and overheating of the bearing components.

[0022] This application first uses a first air path to directly cool the core heat source. The airflow in the first air path flows through the gap between the first magnetic bearing assembly 140, the stator coil 400, and the rotor 300, carrying away most of the heat. In addition, this application provides a second air path that delivers unheated, low-temperature air from the environment directly to the second magnetic bearing assembly 150 inside the motor housing 100 via an external ventilation duct 200, bypassing the main heat-generating area. (This bearing assembly includes one axial magnetic bearing and one radial magnetic bearing, with the axial magnetic bearing being closer to the stator coil 400 and subject to a more severe heat load.) When this low-temperature air comes into contact with the high-temperature component (bearing), a significant temperature difference exists, enabling effective heat exchange and cooling of the distant bearing. The ventilation duct 200 is spaced apart from the high-temperature housing, reducing the preheating of the cold air during transport and improving cooling efficiency. The two airflows converge and are discharged at the exhaust duct 131. This design constitutes a collaborative heat dissipation system, achieving overall and balanced heat dissipation of the internal space of the motor housing 100, and avoiding overheating at the end caused by excessively long airflow paths.

[0023] In the first air path, the axial suction force generated by the cooling impeller 500 directly draws in heat, which flows through the air gap between the first magnetic bearing assembly 140, the rotor 300, and the stator coil 400, carrying away the heat from the motor core before being discharged from the exhaust pipe 131. The airflow in the second air path originates from a pressure difference. When the cooling impeller 500 rotates at high speed, a high-speed low-pressure zone is formed in its inlet center region. This low-pressure zone draws in and carries away gas from its surrounding circumferential region, resulting in a decrease in the circumferential air pressure of the casing. This pressure difference drives external cold air to be passively drawn in through the vent 111 on the first end cover 110, enters the ventilation duct 200, flows to the equalization chamber 130 of the second end cover 120, and is then blown onto the second magnetic bearing assembly 150 for cooling before being discharged from the exhaust pipe 131.

[0024] Furthermore, the equalization chamber 130 evenly distributes the low-temperature air in the second air path, reduces the flow dead zone, and allows each air outlet to blow out cooling airflow synchronously, ensuring uniform cooling of the second magnetic bearing assembly 150 and reducing the surrounding temperature difference.

[0025] In one embodiment, multiple air outlets of the equalization chamber 130 are disposed on the side wall of the equalization chamber 130 facing the first end cover 110. Multiple guide vanes (not shown in the figure) are disposed within the equalization chamber 130. The guide vanes are arc-shaped and radially spaced, and are parallel to the direction of the airflow. Distributing the air outlets on the side wall of the equalization chamber 130 facing the first end cover 110 allows the cooling airflow to directly blow onto the back of the bearing. This ensures that the cooling airflow can reach the bearing area that is difficult to cover by the first air path, forming effective convective heat transfer and reducing cooling dead zones. Multiple radially spaced arc-shaped guide vanes are disposed within the chamber, and the vane direction is parallel to the airflow direction. This structure smoothly guides the airflow to each air outlet, effectively reducing eddies and kinetic energy loss in the chamber, resulting in a more uniform airflow pressure distribution.

[0026] Combination Figure 1 In one embodiment, the motor housing 100 further includes a coolant chamber 160. The coolant chamber 160 is annularly arranged around the stator coil 400, facing away from the rotor 300. The coolant chamber 160 has a coolant inlet and a coolant outlet for continuous coolant flow. The coolant chamber 160 directly surrounds the stator coil 400, effectively conducting away the enormous heat generated during coil operation and suppressing the temperature rise of the stator coil 400. After the coolant enters the cooling chamber through the coolant inlet, it cools the stator coil 400 before exiting through the coolant outlet, ensuring continuous flow.

[0027] Combination Figure 5In one embodiment, the ventilation duct 200 has bends at both ends, namely a first bend 210 near the first end cap 110 and a second bend 220 near the second end cap 120; the first bend 210 has an obtuse angle, and the opening of the first bend 210 connecting to the bearing housing 100 is a flared shape with a gradually decreasing size along the airflow direction. The outer side of the ventilation duct 200 is covered with heat-insulating material. First, the first bend 210 has an obtuse angle, which, compared to a right-angle bend, can more smoothly guide the airflow to change direction, significantly reducing eddies and flow losses caused by airflow impacting the duct wall, allowing the airflow to be drawn into the duct more smoothly and efficiently. Second, the tapering flared structure can collect airflow more efficiently. Its streamlined profile conforms to the principles of gas dynamics, reducing local resistance and making it easier for gas to be drawn into the duct. Finally, the ventilation duct 200 passes through the high-temperature stator coil 400 and rotor 300 areas, and the duct wall may be subjected to some heat radiation. Covering the outside with heat-insulating materials (such as ceramic fiber cotton, polyimide foam, or rubber and plastic insulation sleeves) can effectively block external radiant heat and conductive heat, prevent the cooling airflow in the pipeline from being preheated during transportation, and ensure that the medium reaching the bearing is still a low-temperature cooling medium.

[0028] In one embodiment, a plurality of first guide vanes 211 are fixed inside the first bend 210, and the cross-section of the first guide vanes 211 is crescent-shaped; a plurality of second guide vanes 212 are provided inside the second bend 220, and the outline of the second guide vanes 212 is consistent with the inner wall of the bend of the second bend 220. The crescent-shaped guide vanes in the first bend 210 (obtuse angle) have crescent-shaped convex surfaces that can better adapt to and guide the airflow to a gentle turn. Their shape helps to fill the vortex area that may be generated inside the bend, reduce airflow separation, and thus reduce the flow resistance through the obtuse angle bend. Due to the spatial layout, the second bend 220 may be a right angle or other sharp bend. The second guide vanes 212 provided in the second bend 220 are configured to have their outlines consistent with the inner wall of the bend at sharp bends, which is equivalent to dividing a large sharp bend into multiple continuous small gentle bends. This effectively constrains the airflow, forcing it to flow close to the pipe wall, avoiding the generation of a large vortex zone on the outside of sharp bends, greatly reducing the pressure loss caused by sharp bends, and ensuring the efficiency of airflow delivery.

[0029] Combination Figure 4In one embodiment, the outer periphery of the heat dissipation impeller 500 is provided with an impeller cover 510. The impeller cover 510 is fixed to the first end cover 110 and extends towards the outside of the housing. The inlet end of the impeller cover 510 forms a streamlined, tapering flared opening. The impeller cover 510 is coaxially mounted with the impeller, and its streamlined, tapering flared opening can smoothly guide external gas into the impeller, reducing turbulence and flow losses at the inlet, thereby improving the intake efficiency of the heat dissipation impeller 500. At the same time, the cover structure can effectively prevent external foreign objects or operators from accidentally touching the high-speed rotating impeller, improving the safety of equipment operation.

[0030] In one embodiment, the cooling impeller 500 extends into the inner side of the motor housing 100 and is connected to a tail diffuser 520. The tail diffuser 520 is a shell-shaped structure with openings at both ends, one end of which is installed with the cooling impeller 500, and the area of ​​the other end opening is larger than the area of ​​the air outlet surface of the cooling impeller 500. When the airflow enters the larger diffuser outlet from the smaller air outlet surface of the cooling impeller 500, the flow velocity decreases, and some of the kinetic energy of the gas is converted into static pressure. Increasing the static pressure of the airflow enables it to have more "power" to overcome the resistance of subsequent flow channels (such as the gap between the stator and rotor 300), thereby ensuring that the first air path has sufficient airflow and penetration for effective heat dissipation.

[0031] Combination Figure 2 In one embodiment, the sidewall of the motor housing 100 is provided with a plurality of heat dissipation holes 600. The heat dissipation holes 600 on the sidewall of the motor housing 100 significantly increase the heat dissipation area in contact with the external air, and also create channels that facilitate air convection, thus enhancing airflow. This allows for more effective dissipation of heat transferred from inside the housing to the external environment via thermal conduction.

[0032] In another embodiment, the first end cap 110 is a tail end volute.

[0033] It should be noted that the technical solutions or features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the accompanying drawings; all modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A heat dissipation mechanism for a suspended blower bearing, characterized in that, include: The motor housing (100) has a first end cover (110) and a second end cover (120) at its two ends. Inside the motor housing (100) is a rotor (300) arranged along its axis, and a first magnetic bearing assembly (140), a stator coil (400) and a second magnetic bearing assembly (150) arranged sequentially along the direction from the first end cover (110) to the second end cover (120). The surface of the motor housing (100) is provided with an exhaust pipe (131) connecting the inside and outside. The exhaust pipe (131) is located between the stator coil (400) and the second magnetic bearing assembly (150). The stator coil (400) is sleeved on the outer periphery of the rotor (300). Ventilation ducts (200) are spaced apart on the outside of the motor housing (100), and the ventilation ducts (200) extend axially and connect the two ends of the motor housing (100); A heat dissipation impeller (500) is installed on the outside of the first end cover (110) and coaxially connected to the rotor (300); The first end cover (110) has multiple vent holes (111) circumferentially opened on its edge. The exhaust pipe (131) is located on the side of the stator coil (400) away from the first end cover (110). The second end cover (120) is provided with an equalization chamber (130). The end of the ventilation pipe (200) is inserted into the equalization chamber (130), and the equalization chamber (130) is evenly provided with multiple air outlets. The heat dissipation impeller (500) is configured to form a first air passage and a second air passage during operation. The first air passage enters the interior of the motor housing (100) through the heat dissipation impeller (500), flows through the first magnetic bearing assembly (140) and the gap between the rotor (300) and the stator coil (400), and is discharged from the exhaust pipe (131). The second air passage enters the ventilation duct (200) through the ventilation hole (111), flows to the air equalization chamber (130), and the second magnetic bearing assembly (150) enters the motor housing (100) from the air outlet to cool the bearings before being discharged from the exhaust pipe (131).

2. The suspended blower bearing heat dissipation mechanism as described in claim 1, characterized in that, The plurality of air outlets of the equalization chamber (130) are disposed on the side wall of the equalization chamber (130) facing the first end cap (110); The gas equalization chamber (130) is provided with multiple guide vanes, which are arc-shaped and arranged at radial intervals, and the guide vanes are parallel to the direction of the airflow.

3. The suspended blower bearing heat dissipation mechanism as described in claim 1, characterized in that, The motor housing (100) is further provided with a coolant chamber (160), which is arranged in a ring around the outer periphery of the stator coil (400) facing away from the rotor (300). The coolant chamber (160) has a coolant inlet and a coolant outlet for continuous cooling.

4. The suspended blower bearing heat dissipation mechanism as described in claim 1, characterized in that, The ventilation duct (200) is bent at both ends, namely a first bend (210) near the first end cap (110) and a second bend (220) near the second end cap (120). The first bend (210) is an obtuse angle, and the opening of the first bend (210) connecting to the motor housing (100) is a trumpet shape with the size gradually decreasing along the airflow direction; The ventilation duct (200) is covered with heat insulation material on the outside.

5. The suspended blower bearing heat dissipation mechanism as described in claim 4, characterized in that, The first bending portion (210) has a plurality of first guide vanes (211) fixed inside, and the cross-section of the first guide vane (211) is crescent-shaped; The second bending portion (220) is provided with a plurality of second guide vanes (212), the outline of the second guide vanes (212) being consistent with the curved inner wall of the second bending portion (220).

6. The suspended blower bearing heat dissipation mechanism as described in claim 1, characterized in that, The outer periphery of the heat dissipation impeller (500) is provided with an impeller cover (510), which is fixed to the first end cover (110) and extends toward the outside of the housing; The inlet end of the heat dissipation impeller cover (510) is formed with a streamlined tapering flared opening.

7. The suspended blower bearing heat dissipation mechanism as described in claim 1, characterized in that, The heat dissipation impeller (500) extends into the inner side of the motor housing (100) and is connected to a tail diffuser (520). The tail diffuser (520) is a shell-shaped structure with openings at both ends. One end is installed with the heat dissipation impeller (500), and the area of ​​the other end is larger than the area of ​​the air outlet surface of the heat dissipation impeller (500).

8. The suspended blower bearing heat dissipation mechanism as described in claim 1, characterized in that, The side wall of the motor housing (100) is provided with a plurality of heat dissipation holes (600).

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