Air blower with built-in axial flow fan for heat dissipation

Abstract

The invention belongs to the field of air blowers, discloses an air suspension air blower with a built-in axial flow fan for heat dissipation, and solves the problems of product damage, high power consumption and high cost caused by high heat generated by high-speed rotation of a motor in the air blower. The air blower with the built-in axial flow fan for heat dissipation comprises an impeller, a volute, a high-speed permanent magnet motor and an axial flow fan assembly, the impeller is fixedly installed on a motor rotor shaft supported by an air suspension bearing, and the axial flow fan brings internal hot air to the outside. The air blower with the built-in axial flow fan for heat dissipation is not only suitable for air suspension air blowers, but also suitable for common air blowers, and is also suitable for other devices needing to dissipate heat from inside to outside.

Description

Technical Field

[0001] The invention belongs to the technical field of blowers, and in particular relates to an air suspension blower with a built-in axial flow fan for heat dissipation. Background Art

[0002] Common blowers include core components such as motors, impellers, and volutes. Common motors contain motor stators, motor rotor shafts, magnets, sheaths, and other components. The heat generated by the motor mainly comes from the stator and rotor of the motor. From the actual operation of the motor, it can be seen that temperature is an important factor affecting the performance and service life of the motor, especially for high-frequency, high-power, and high-speed permanent magnet motors. Reasonable heat dissipation of the motor is particularly important.

[0003] Conventional high-speed permanent magnet motors generally use air cooling and water cooling to dissipate heat. The water cooling structure is relatively complex, often has the risk of leakage, and the cost is relatively high. Commonly used air cooling structures are generally: 1. Blowing air from the outside of the motor casing to dissipate heat, which is often used for small power motors, but often due to internal and external thermal resistance problems, the greater the motor power, the worse the heat dissipation effect; 2. A coaxial centrifugal impeller fan is installed inside the motor for heat dissipation. Although this heat dissipation structure has good effect, it is noisy, the manufacturing process is complex, and the cost is relatively high (5-axis machine processing is required). Moreover, when the blower is running, the power consumption of the cooling fan is also relatively large, basically reaching more than 5% (for example, for a 100KW host, the heat dissipation power consumption reaches 5KW); 3. Other suction or blowing heat dissipation structures.

[0004] As the leader in the blower field, if we can do a better job of heat dissipation inside the motor and core components such as the impeller, we can achieve more and better application scenarios. Summary of the invention

[0005] The present invention aims to solve the problems of poor heat dissipation effect of the blower and its motor, high temperature resulting in short life, risk of leakage, high heat dissipation energy consumption, high noise at the heat dissipation end, and high production cost.

[0006] The present invention discloses a blower with built-in axial fan heat dissipation, comprising a motor, an impeller and an axial fan heat dissipation component composed of an axial fan and its guide seat, wherein the impeller and the axial fan heat dissipation component are respectively fixedly mounted on both ends of the rotor shaft of the motor; a volute is installed on the outside of the impeller, and when the impeller rotates with the motor rotor shaft, air inlet and air outlet of the blower are formed through the volute; a motor casing with an outer surface designed to be evenly distributed aluminum fins is installed on the outside of the stator of the motor to obtain a better ventilation effect.

[0007] A further optimization is that a heat dissipation shroud of the motor housing is installed on the outside of the aluminum fin motor housing; a heat dissipation air inlet pipe used in conjunction with the axial flow fan is installed on the outside of the axial flow fan guide seat, and is also equipped with a heat dissipation air outlet pipe for allowing the hot air inside the blower to pass through the heat dissipation shroud and finally be discharged; the air flow is sucked into the blower through the heat dissipation air inlet pipe by the axial flow fan, enters all the pores inside the blower that can be reached, and then is discharged from the heat dissipation air outlet pipe with the heat generated inside.

[0008] The motor preferably uses a self-made high-speed permanent magnet motor, and its heat source mainly comes from the motor stator and the motor rotor shaft. A further optimization is to provide ventilation grooves on the outer surface of the motor stator to enhance the heat dissipation effect.

[0009] As a further optimization, radially evenly distributed heat dissipation vents are opened on the cylindrical end face of the motor housing close to the volute, allowing the internal airflow to enter the aluminum fin grooves or other pores faster.

[0010] As a further optimization, the blower is an air suspension blower, that is, the motor rotor shaft is suspended and supported by an air bearing assembly when rotating, and the motor rotor shaft is in a suspended state in the air when rotating.

[0011] Preferably, the air bearing assembly is mounted on the rotor shaft outside the motor stator, and there is an air bearing assembly on each shaft outside the two ends of the stator, and the air bearing assembly is located inside the impeller and the axial flow fan on the shaft.

[0012] The axial flow fan in the present invention is cleverly designed, simple to manufacture, and low in cost. It consumes less energy and has lower noise than the usual centrifugal fan during operation. The power consumption of the axial flow fan is basically controlled within 2% of the total power, while the conventional heat dissipation power consumption often accounts for 5% of the total power. The present invention realizes a new type of heat dissipation structure inside the host that brings the cold air from the outside to the inside and then from the inside to the outside. Not only is the heat dissipation effect inside the host good, but the optimization of the overall design makes the heat dissipation effect of the whole machine comprehensively improved, the product is safer, and the product life is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The diagrams used in the present invention are described as follows: Figure 1 Schematic diagram of the internal structure of an air suspension blower with axial fan cooling Figure 2 Motor housing with fins and ventilation holes Figure 3 Structure of the axial flow fan 10 Figure 4 Motor stator with ventilation slots 6 Figure 5 Stereoscopic image of the host after removing the heat dissipation shroud 8 Figure 6 Blower appearance stereogram Numbers in the figure: 1 impeller 2 volute 3 thrust bearing mounting seat 4 radial mounting seat 5 rotor shaft 6 motor stator 7 motor housing 8 heat dissipation guide cover of motor housing 9 heat dissipation outlet pipe 10 axial flow fan 11 axial flow fan guide seat 12 heat dissipation inlet pipe 13 motor bracket 14 air bearing assembly Example

[0014] Here, a specific implemented product is taken as an example to introduce the technical solution of the present invention in detail.

[0015] The embodiment discloses an air suspension blower with a built-in axial flow fan for heat dissipation, and its appearance is as follows: Figure 6 As shown, the internal structure is as Figure 1 As shown, it comprises a motor, an impeller supported by an air suspension bearing and an axial flow fan heat dissipation component, wherein the impeller and the axial flow fan heat dissipation component are respectively fixedly mounted at both ends of the rotor shaft 5 of the motor; a volute 2 is arranged outside the impeller 1, and when the impeller 1 rotates with the motor rotor shaft 5, air inlet and air outlet are formed by means of the volute 2; In this embodiment, Figure 1 As shown, the stator of the motor is provided with a motor housing 7; Figure 2 As shown, the motor housing 7 is designed as an aluminum fin type to facilitate heat dissipation; evenly distributed heat dissipation vents are opened on the cylindrical surface of the motor housing 7 close to one end of the volute.

[0016] The axial flow fan heat dissipation component includes an axial flow fan 10 (such as Figure 3 When the motor rotor shaft rotates, the axial flow fan 10 and the axial flow fan guide seat 11 suck the external wind into the motor and move along the axial direction of the motor rotor. Figure 1 The arrow in the gap shown pushes the air forward, and the air flow goes all the way to the volute of the motor rotor shaft 5, and then follows the gaps in the motor and / or the vents on the components to discharge the air flow that already carries the internal heat to the outside.

[0017] like Figure 6 and Figure 1 As shown, the outside of the motor housing 7 in this embodiment is further provided with a heat dissipation guide cover 8 ( Figure 1 As shown); on the heat dissipation guide cover 8, a heat dissipation outlet pipe 9 is configured for the last step of the airflow process; on the outside of the axial flow fan guide seat, a heat dissipation inlet pipe 12 used in conjunction with the axial flow fan 10 is installed.

[0018] like Figure 1As shown, the axial fan 10 draws the external cold air into the motor in the direction of the heat dissipation air intake arrow, passes through the motor rotor shaft 5 and the motor stator 6, and the main purpose is to take away the surface heat of these two main heat sources at a faster air flow rate, and then the air flow after passing through the two heat sources (practice verifies that the gas temperature is lower than the surface temperature of the motor housing 7) passes through the motor housing 7 ( Figure 2 The heat dissipation pipe 9 is used to discharge the heat from the main unit. Figure 1 The direction of the arrow is the heat dissipation principle described in the present invention.

[0019] In this embodiment, if Figure 1 As shown, the bearing supporting the motor rotor shaft is an air bearing assembly 14, wherein the air bearing assembly 14 includes a thrust bearing mounting seat 3 and a radial mounting seat 4, and an air bearing assembly 14 is disposed at each end of the motor rotor shaft 5 outside the motor stator. Figure 1 As shown; the air bearing assembly 14 includes a thrust bearing mount and a radial mount; In this embodiment, the motor uses a high-speed permanent magnet motor, and its heat source mainly comes from the motor stator 6 and the motor rotor shaft 5 of the motor rotor. From the actual situation of motor operation, temperature affects the performance and service life of the motor, especially for this kind of high-frequency, high-power, high-speed permanent magnet motor, the reasonable heat dissipation of the motor is particularly important; the motor stator 6 in this embodiment, such as Figure 4 As shown, the outer surface of the motor stator has ventilation slots for heat dissipation.

[0020] After repeated actual measurements, it is known that the temperature of the gas coming out of the two major heat sources, the motor stator 6 and the motor rotor shaft 5, is lower than the temperature of the aluminum fins of the motor housing. In addition to taking away the heat of the two major heat sources inside the motor, the wind coming out of the motor rotor shaft also Figure 5 , Figure 6 The structure shown, such as Figure 1 The wind flow direction shown can obviously provide secondary cooling to the motor housing fins and finally discharge it out of the main unit. The actual product also has the same effect.

[0021] The beneficial effects of this embodiment during manufacturing and practical use are that the axial flow fan 10 used is cleverly designed, simple to manufacture, low in cost, and has lower energy consumption and lower noise than a conventional centrifugal fan during operation; the power consumption of the axial flow fan of the present invention is basically controlled within 2% of the total power, while conventional heat dissipation power consumption often accounts for 5% of the total power consumption.

[0022] The air suspension blower with axial fan heat dissipation is a new type of blower heat dissipation structure that uses a heat dissipation fan coaxial with the rotor shaft as a power source to achieve internal blowing. Using the heat dissipation structure disclosed in the present invention, the finished product has a good heat dissipation effect and a longer product life. It is not only suitable for air suspension blowers, but also suitable for other products such as ordinary blowers that need to reduce internal heat.

Claims

1. A blower with a built-in axial flow fan for heat dissipation, comprising a motor and an impeller as core components, characterized in that: An axial flow fan heat dissipation component including an axial flow fan and an axial flow fan guide seat is also installed, wherein the impeller and the axial flow fan heat dissipation component are respectively fixedly installed on the two ends of the rotor shaft of the motor; a volute is installed outside the impeller, and when the impeller rotates with the motor rotor shaft, the air inlet and air outlet of the blower are formed through the volute; a motor casing with evenly distributed aluminum fins on the outer surface is installed outside the stator of the motor.

2. The blower with built-in axial flow fan for heat dissipation as claimed in claim 1, characterized in that: The motor housing is provided with a plurality of radially evenly distributed air holes on a cylindrical surface close to one end of the volute.

3. The blower with built-in axial flow fan for heat dissipation as claimed in claim 1, characterized in that: A motor housing heat dissipation shroud is also installed on the outside of the aluminum fin motor housing; a heat dissipation outlet pipe is also installed on the heat dissipation shroud to discharge the hot air inside the host after passing through the heat dissipation shroud; and a heat dissipation inlet pipe is provided for the axial flow fan on the axial flow fan shroud seat.

4. The blower with built-in axial flow fan for heat dissipation as claimed in claim 1, characterized in that: The motor is a self-made high-speed permanent magnet motor, and the outer surface of the motor stator is provided with ventilation grooves.

5. The blower with built-in axial flow fan for heat dissipation as claimed in claim 1, characterized in that: The blower is an air suspension blower, that is, when the motor rotor shaft rotates, it is a contactless air suspension rotation motion supported by an air bearing assembly.

6. A blower with built-in axial flow fan heat dissipation as claimed in any one of the above claims, characterized in that: The blower is an air suspension blower; The motor is a self-made high-speed permanent magnet motor, and the outer surface of the motor stator is provided with ventilation grooves; on the outer shell of the motor with aluminum fins, radially evenly distributed air vents are opened on the cylindrical surface close to the volute end; a heat dissipation hood is installed on the outside of the aluminum fin motor shell; on the heat dissipation hood, a heat dissipation outlet pipe is also installed for the hot air inside the blower to be discharged after passing through the hood; and a heat dissipation inlet pipe is provided for the axial fan on the axial fan guide seat.

7. The blower with built-in axial flow fan for heat dissipation as claimed in claim 6, characterized in that: The air bearing assembly is installed on the rotor shaft near the outside of the motor stator. An air bearing assembly is installed at each end outside the motor stator and is located inside the impeller and the axial flow fan on the shaft.

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