Integrated high-speed centrifugal fan

Abstract

The application provides an integrated high-speed centrifugal fan, which comprises a main centrifugal impeller, a high-speed motor, a control unit and a supporting part, the high-speed motor drives the main centrifugal impeller to rotate under the control of the control unit, and the high-speed motor is provided with a dust removal and heat dissipation structure, which comprises an air inlet, is throughly arranged at one end of a casing of the high-speed motor and faces away from the main centrifugal impeller; a dust removal impeller is arranged between the air inlet and a stator of the high-speed motor and is fixedly connected with a motor shaft of the high-speed motor; a first air outlet is throughly arranged at a side wall of the casing of the high-speed motor, and the axial positions of the first air outlet and the dust removal impeller match with each other; a heat dissipation channel is throughly arranged on the stator of the high-speed motor; and a second air outlet is throughly arranged at one end of the casing of the high-speed motor and faces the main centrifugal impeller. The integrated high-speed centrifugal fan has reasonable structural design and high integration degree, the motor is provided with the dust removal and heat dissipation structure, and is beneficial to installation, maintenance and large-flow ventilation in various small sizes and harsh environments.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of centrifugal fans, and specifically provides an integrated high-speed centrifugal fan. BACKGROUND

[0002] The high-speed centrifugal fan is suitable for ventilation and air conditioning scenes with high flow and high static pressure requirements. In the field of rail transit applications, the high-speed centrifugal fan can be integrated in a car air conditioning unit to realize indoor circulating air supply, fresh air introduction and exhaust gas discharge, so as to meet the requirements of air replacement and heat and humidity load regulation in the car.

[0003] The car air conditioning unit has high requirements for the installation and maintenance of the centrifugal fan. The installation space is generally small, and the installation and maintenance conditions are poor. In addition, the rail transit vehicle can run in various air environments. The motor arranged outside the car needs to be able to run at high speed for a long time and stably under various sand and dust conditions, so it needs to meet the requirements of heat dissipation and dust prevention at the same time. SUMMARY

[0004] The application provides an integrated high-speed centrifugal fan through an embodiment. By optimizing the structure of the fan and the motor, convenient installation and maintenance in various small-size environments are realized, and the motor can be cooled while avoiding damage to the motor caused by sand, dust and impurities under high-speed running conditions.

[0005] The integrated centrifugal fan system includes a main centrifugal impeller, a high-speed motor, a control unit and a support part. The high-speed motor drives the main centrifugal impeller to rotate through the motor shaft under the control of the control unit. The support part is used to support the main centrifugal impeller, the high-speed motor and the control unit. A dust removal and heat dissipation structure is arranged on the high-speed motor. The dust removal and heat dissipation structure includes:

[0006] An air inlet is arranged through the side of the high-speed motor casing away from the main centrifugal impeller;

[0007] A dust removal impeller is arranged between the air inlet and the stator of the high-speed motor and is fixedly connected with the motor shaft of the high-speed motor;

[0008] A first air outlet is arranged through the side wall of the high-speed motor casing, and the axial positions of the first air outlet and the dust removal impeller match each other;

[0009] A heat dissipation channel is arranged through the stator of the high-speed motor;

[0010] A second air outlet is arranged through the side of the high-speed motor casing towards the main centrifugal impeller.

[0011] Further, the dust removal impeller comprises a flow guide ring, a plurality of dust removal blades and a fixing disc arranged in sequence along the axial direction; the flow guide ring and the fixing disc are close to the air inlet and the stator of the high-speed motor respectively; the plurality of dust removal blades are arranged in a spaced manner along the circumferential direction and are fixedly connected with the flow guide ring and the fixing disc; on the axial section of the dust removal impeller, the width of the area between the flow guide ring and the fixing disc first contracts and then remains unchanged or first contracts and then expands along the radial direction from inside to outside.

[0012] Further, the flow guide ring comprises a first annular zone and a first flow guide structure, wherein the first annular zone is fixedly connected with the dust removal blades, and the first flow guide structure is curved towards the air inlet along the radial direction from outside to inside; the fixing disc comprises a second annular zone, a concave disc and a second flow guide structure, wherein the second annular zone is fixedly connected with the dust removal blades, the concave disc has a concave shape gradually contracting from front to back along the axial direction and is fixedly connected with the motor shaft, and the second flow guide structure is curved towards the air inlet along the radial direction from outside to inside.

[0013] Preferably, the side wall thickness of the shell of the high-speed motor gradually increases in the direction opposite to the rotation direction of the high-speed motor at the first air outlet until a preset thickness is reached.

[0014] Preferably, the dust removal and heat dissipation structure further comprises a dust collecting ring fixedly connected with the inner side of the shell of the high-speed motor, and the axial position of the dust collecting ring is located between the first air outlet and the stator of the high-speed motor.

[0015] Further, the main centrifugal impeller comprises a front disc, a plurality of centrifugal blades and a rear disc arranged in sequence along the axial direction; the rear disc is fixedly connected with the motor shaft of the high-speed motor; the plurality of centrifugal blades are arranged in a spaced manner along the circumferential direction and are fixedly connected with the front disc and the rear disc.

[0016] Preferably, the ratio of the minimum value of the axial length of the dust removal blade to the minimum value of the axial length of the centrifugal blade is less than or equal to 1:10; and the ratio of the chord length of the dust removal blade to the chord length of the centrifugal blade is less than or equal to 1:8.

[0017] Preferably, the rear disc of the main centrifugal impeller is further provided with an auxiliary heat dissipation structure for increasing the flow speed of the airflow discharged from the second air outlet and thrown away from the high-speed motor along the radial direction.

[0018] Preferably, the outer surface of the rear disc towards the side of the high-speed motor is parallel to the outer surface of the housing of the high-speed motor towards the side of the main centrifugal impeller, and the distance is not more than 20 mm; the auxiliary heat dissipation structure comprises a plurality of heat dissipation blades and a heat dissipation guide ring; the heat dissipation blades are arranged on the outer surface of the rear disc towards the side of the high-speed motor in a circumferential direction, and the height of the heat dissipation blades gradually decreases from inside to outside in a radial direction; the heat dissipation guide ring is fixedly connected to the side of the heat dissipation blades towards the high-speed motor, and the inner diameter of the heat dissipation guide ring is greater than the maximum radial distance between the second gas outlet and the axis of the high-speed motor.

[0019] Preferably, the ratio of the minimum value of the axial length of the dust removal blade to the minimum value of the axial length of the heat dissipation blade is greater than or equal to 3:1; and the ratio of the chord length of the dust removal blade to the chord length of the heat dissipation blade is less than or equal to 1:8.

[0020] Further, the support part comprises a front panel, a rear panel, a flow guide disc and a plurality of support columns, the front panel and the rear panel are parallel to each other, and the plurality of support columns are fixedly connected between the front panel and the rear panel; the high-speed motor penetrates through the rear panel and is fixedly connected to the rear panel; the main centrifugal impeller is located between the front panel and the rear panel; the flow guide disc penetrates through the front panel, one end of the flow guide disc is radially expanded and fixedly connected to the front panel, and the other end of the flow guide disc extends into the front disc of the main centrifugal impeller.

[0021] Further, the control unit is arranged in a dustproof electric box, and the dustproof electric box is fixedly arranged on the outer surface of the rear panel away from the front panel.

[0022] The integrated high-speed centrifugal fan provided by the embodiment of the application has the advantages that the main centrifugal impeller, the high-speed motor and the control unit are fixed and supported in an integrated manner by the support part, the positions and cooperation relationships between the components are reasonable and compact, and the integration degree is high, which is beneficial to equipment installation, maintenance and large-flow ventilation in a small-size ventilation environment; meanwhile, the dust removal and heat dissipation structure is arranged on the high-speed motor, and the impurities can be effectively filtered before the high-speed motor is efficiently cooled by arranging a plurality of air inlets, air outlets and dust removal blades, so that the high-speed motor can safely operate in a harsh environment. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 FIG. 1 is a perspective view of an integrated high-speed centrifugal fan according to an embodiment of the application;

[0024] Figure 2 FIG. 3 is a top view of the integrated high-speed centrifugal fan according to the embodiment of the application;

[0025] Figure 3A perspective structural schematic view of the integrated high-speed centrifugal fan according to the embodiment of the present application is provided;

[0026] Figure 4 A perspective structural schematic view of the integrated high-speed centrifugal fan according to the embodiment of the present application is provided;

[0027] Figure 5 A side view of the integrated high-speed centrifugal fan according to the embodiment of the present application is provided;

[0028] Figure 6 A partial structural exploded view of the integrated high-speed centrifugal fan according to the embodiment of the present application is provided;

[0029] Figure 7 A partial structural sectional view of the integrated high-speed centrifugal fan according to the embodiment of the present application is provided;

[0030] Figure 8 A Figure 7 enlarged schematic view of the portion I in the circle;

[0031] Figure 9 A partial structural sectional view of the high-speed centrifugal fan according to the embodiment of the present application is provided;

[0032] Figure 10 A Figure 11 enlarged schematic view of the portion III in the circle;

[0033] Figure 11 A perspective structural schematic view of the dust removal impeller according to the embodiment of the present application is provided;

[0034] Figure 12 A sectional view and a partial enlarged schematic view of the dust removal impeller according to the embodiment of the present application are provided;

[0035] Figure 13 A structural schematic view of the main centrifugal impeller according to the embodiment of the present application is provided;

[0036] Figure 14 A top view of the main centrifugal impeller according to the embodiment of the present application is provided;

[0037] Figure 15 A sectional view of the main centrifugal impeller according to the embodiment of the present application is provided;

[0038] Figure 16 A Figure 15 enlarged schematic view of the portion IV in the circle;

[0039] Figure 17 A partial structural sectional view of the integrated high-speed centrifugal fan according to the embodiment of the present application is provided;

[0040] Figure 18 AFigure 17 An enlarged schematic view of the portion V in the circle;

[0041] Figure 19 A schematic view of the cooperation of three centrifugal impeller structures according to the embodiments of the present application;

[0042] Figure 20 A Figure 19 Cross-sectional views of the E-E line, the F-F line and the G-G line of

[0043] Figure 21 A Figure 19 Cross-sectional view of the H-H line of

[0044] Reference numerals in the drawings

[0045] Main centrifugal impeller 1, front disc 11, rear disc 12, centrifugal blade 13, heat dissipation blade 14, heat dissipation guide ring 15, high-speed motor 2, rear cover 211, side wall 212, front cover 213, fixing structure 22, stator 23, rotor 24, motor shaft 25, key groove 251, connecting piece 252, through hole 253, dust collecting ring 26, dustproof electric box 3, support part 4, front panel 41, rear panel 42, support column 43, flow guide disc 5, strong electric cable 61, weak electric cable 62, motor output cable 63, air inlet 71, dust removal impeller 72, flow guide ring 721, first annular zone 7211, first flow guide structure 7212, fixing disc 722, second annular zone 7221, inner concave disc 7222, second flow guide structure 7223, dust removal blade 723, first air outlet 73, heat dissipation channel 74, second air outlet 75. DETAILED DESCRIPTION

[0046] Hereinafter, the present application will be further described based on the preferred embodiments and with reference to the drawings.

[0047] In the description of the embodiments of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the embodiments of the present application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, in the description of the present application, in order to distinguish different units, the first, second and the like are used in the specification, but these are not limited by the order of manufacture, and cannot be understood as indicating or implying relative importance, and the name may be different in the detailed description and the claims of the present application. In addition, in order to facilitate understanding, various components on the drawing are enlarged or reduced, but this practice is not intended to limit the protection scope of the present application.

[0048] The words in the specification are used for the purpose of describing the embodiments of the present application, but are not intended to limit the present application. It should also be noted that, unless otherwise explicitly specified and limited, if the terms "arranged", "connected", "linked" appear, they should be understood in a broad sense, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, can be directly connected, or indirectly connected through an intermediate medium, can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood specifically.

[0049] The present application provides an integrated high-speed centrifugal fan, Figure 1 The present application provides an integrated high-speed centrifugal fan, Figure 2 The present application provides an integrated high-speed centrifugal fan, Figure 3 The present application provides an integrated high-speed centrifugal fan, Figure 4 The present application provides an integrated high-speed centrifugal fan, Figure 5 The present application provides an integrated high-speed centrifugal fan, Figure 6 The present application provides an integrated high-speed centrifugal fan, Figure 7 The present application provides an integrated high-speed centrifugal fan, Figure 2 The present application provides an integrated high-speed centrifugal fan, Figure 8 The present application provides an integrated high-speed centrifugal fan, Figure 7 The present application provides an integrated high-speed centrifugal fan, Figure 9 The present application provides an integrated high-speed centrifugal fan, Figure 5 The present application provides an integrated high-speed centrifugal fan, Figures 1 to 9 The present application provides an integrated high-speed centrifugal fan, The present application provides an integrated high-speed centrifugal fan,

[0050] Specifically, the main centrifugal impeller 1 is the core aerodynamic component of the integrated high-speed centrifugal fan, which drives the airflow in the area requiring ventilation to enter axially and throw away radially. The motor shaft of the high-speed motor 2 is coaxially fixedly connected with the main centrifugal impeller 1, and rotates at a set speed (optionally, the rated speed range is between 4500 revolutions per minute and 5000 revolutions per minute) under the control of the control unit.

[0051] In order to facilitate installation and maintenance under small size application conditions, as shown in the above figures, the support part 4 formed by the front panel 41, the rear panel 42, and a plurality of parallel support columns 43 provides integrated fixed support for the high-speed motor 2, the main centrifugal impeller 1, and the control unit.

[0052] Specifically, the rear panel 42 is provided with a through hole for the high-speed motor 2 to pass through, the housing of the high-speed motor 2 is generally cylindrical, and includes a disc-shaped front cover 211, a cylindrical side wall 212, and a disc-shaped rear cover 213 along the air inlet direction, which are assembled by screws and screw holes or buckles, and can be easily disassembled. In addition, part of the housing of the high-speed motor 2 is also configured to be fixed on the rear panel 42, for example, four protrusions for accommodating screw holes, which are matched with the screw holes of the fixing structure 22 in the shape of a rectangle and capable of accommodating the high-speed motor 2 to pass through. In the assembled state, the high-speed motor 2 passes through the fixing structure and is fixed by the matched screws and screw holes, and the fixing structure is fixed on the rear panel 42 by the screw and screw hole structure.

[0053] The main centrifugal impeller 1 is located in the area surrounded by the front panel 41, the rear panel 42, and the support rods 43, and includes a front disc 11, a plurality of centrifugal blades 13, and a rear disc 12 arranged in sequence along the air inlet direction, wherein the rear disc 13 is fixedly connected with the motor shaft of the high-speed motor 2, and the plurality of centrifugal blades 13 are arranged in a circumferential direction and fixedly connected with the front disc 11 and the rear disc 12.

[0054] The front disc 11 is in the shape of a cylinder facing the air inlet direction, and the cylinder diameter gradually expands in the radial direction during the extension to the rear disc, until it becomes a disc extending in the radial direction, so as to form a good air inlet guide shape.

[0055] The center area of the rear disc has a through hole for the motor shaft 25 to pass through, and the motor shaft 25 is provided with a key groove 251, and the main centrifugal impeller 1 can be fixed on the motor shaft 25 by a flange-shaped connecting piece 252 and a key (not shown in the figure) matched with the key groove.

[0056] In some preferred embodiments, as shown in the above figures, the rear disc 12 is configured as a circular flat plate structure, and the side facing the high-speed motor 2 is parallel to the outer surface of the front cover 211 of the high-speed motor 2. Further, the distance between the side of the rear disc facing the high-speed motor 2 and the outer surface of the front cover 211 of the high-speed motor 2 is not more than 20 mm, so as to shorten the distance between the high-speed motor 2 and the main centrifugal impeller 1, and further realize the integration of the equipment.

[0057] The model and specifications of the high-speed motor 2 can be selected according to specific application needs, and a suitable control unit is provided therefor. For example, when the integrated high-speed centrifugal fan is applied to a ventilation and air exchange scene in the field of rail transit, the high-speed motor 2 can be a permanent magnet synchronous motor, and a variable frequency control mode is used to adjust the speed. Correspondingly, the control unit generally consists of a variable frequency module, a processor module, a detection module, a communication module, and a protection module, etc. The variable frequency module (including gate drive and main power stage, etc.) is used to convert input electrical energy into adjustable voltage and / or frequency electrical energy to supply the motor to achieve speed regulation. The processor module executes a vector control algorithm to adjust the speed and / or torque of the motor according to the input control signal. The detection module is used to obtain current, voltage, temperature, position, speed, etc. information. The communication interface module is used to exchange settings and status with the upper control system. The protection module is used to implement protection actions in the case of overvoltage, overcurrent, overtemperature, etc. It should be pointed out that the above implementation of the control unit is only illustrative, and those skilled in the art can flexibly design a control unit form suitable for the high-speed motor 2 according to the specific motor selection situation.

[0058] In the embodiments of the present application, the control unit can be arranged in the form of strong and weak current separation on the corresponding circuit board, which is integrally arranged in the dustproof electrical box 3 fixedly connected to the outer surface of the side of the rear panel 42 facing away from the main centrifugal impeller 1. Its shape is set as a long and narrow three-fold type to adapt to the installation of the high-speed motor 2, which is beneficial to space layout. The cable joint is provided on the electrical box 3, and the strong current (including upstream power supply input, etc.) and the weak current (including control instructions, state feedback, communication signals, etc.) are connected to different parts of the control unit through the strong current cable 61 and the weak current cable 62 respectively. The power output (such as voltage, frequency adjustable alternating current) for driving the motor is generated by the control unit, and then output to the high-speed motor 2 through the motor cable 63, so as to realize the control of the motor speed.

[0059] As shown in Figure 6 The high-speed motor 2 further includes a stator 23, a rotor 24 and a motor shaft 25 in addition to the shell, wherein the stator 23 is fixedly arranged inside the shell of the high-speed motor 2 and includes a stator core and three-phase stator windings sequentially wound thereon. The three-phase windings are respectively connected to three-phase driving currents. The rotor 24 is composed of a magnetic pole structure with alternating polarity. The motor shaft 25 is coaxially fixedly connected with the rotor 24, and its two ends are rotatably connected with the shell of the high-speed motor 2 through bearings. The end of the motor shaft 25 facing the main centrifugal impeller 1 protrudes from the front cover 211 and is fixedly connected with the rear disc 12 of the main centrifugal impeller 1.

[0060] When the integrated high-speed centrifugal fan is applied to an environment with small size and high static pressure, the heat generated by the high-speed operation of the motor is not easy to dissipate. Therefore, it is important to ensure good heat dissipation of the motor under long-time high-speed operation to improve the reliability and stability of the integrated high-speed centrifugal fan.

[0061] In the currently disclosed technical solutions, an axial through heat dissipation channel can be arranged inside the motor, and an axial flow fan or the like is used to drive airflow outside the motor to flow through the inside of the motor to carry away the heat generated by the rotation of the motor. However, the above structure improves the heat dissipation effect, but also allows sand, dust and other impurities in the external environment to enter the motor, causing the performance of the motor to decrease or even the structure to be damaged. In the field of rail transit, since the motor is arranged outside the car, the above problems will be more prominent.

[0062] To solve the dust removal and heat dissipation requirements of the motor under high-speed operation in the above small-size application scenarios, in the embodiments provided by the present application, a dust removal and heat dissipation structure is further arranged on the high-speed motor 2, as shown in Figures 1 to 6 The dust removal and heat dissipation structure includes an air inlet 71, a dust removal impeller 72, a first air outlet 73, a heat dissipation channel 74, and a second air outlet 75.

[0063] Specifically, the air inlet 71 is used to construct a channel for the airflow outside the high-speed motor 2 to enter the inside of the motor. The number of air inlets 71 can be set according to the specific air volume requirement for heat dissipation of the high-speed motor 2, and there is at least one, or as shown in the above figures, a plurality of air inlets 71 are arranged at intervals in the circumferential direction. Each air inlet 71 is arranged through the side of the housing of the high-speed motor 2 opposite to the main centrifugal impeller 1, for example, when the housing of the motor adopts the form of a front cover 211, a side wall 212 and a rear cover 213 that can be detachably connected as shown in the above figures, each air inlet 71 penetrates the rear cover 213.

[0064] The dust removal impeller 72 is arranged between the air inlet 71 and the rotor 24 of the high-speed motor 2 in the axial direction, and is fixedly connected with the motor shaft 25 of the high-speed motor 2 through interference fit or key connection or the like. The first air outlet 73 is arranged through the side wall 212 of the housing of the high-speed motor 2, and the axial positions of the first air outlet 73 and the dust removal impeller 72 match each other and are kept at substantially the same height. Referring to Figures 7 to 10When the motor shaft 25 rotates at high speed, the dust-removing impeller 72 rotates synchronously under the drive of the motor shaft 25, so as to throw the airflow flowing into the air inlet 71 radially outward, and make the airflow flow circumferentially along the inner surface of the shell of the high-speed motor 2. In the process of circumferential flow, the sand, dust and impurities existing in the airflow will move close to the inner surface of the shell under the action of centrifugal force. When the sand, dust and impurities move to the position of the first air outlet 73, they can be thrown out of the high-speed motor 2 in the range of the first air outlet 73 because they lose the constraint of the side wall 212, and the remaining airflow continues to move along the inner surface of the side wall 212.

[0065] In some preferred embodiments, the number of the first air outlets 73 can be one, or two first air outlets 73 can also be arranged on the opposite side of the side wall 212, but the number of the first air outlets 73 does not exceed two. If too many first air outlets 73 are arranged, the airflow introduced into the high-speed motor 2 will be discharged before participating in heat dissipation, which will cause energy waste of the high-speed motor 2.

[0066] It can also be known from the above analysis that the circumferential length L of the first air outlet 73 is not the larger the better. Although a larger L can increase the probability of sand, dust and impurities being discharged out of the shell of the high-speed motor 2, it is realized at the cost of greatly increasing the gas flow discharged from the first air outlet 73, which will also reduce the proportion of the airflow participating in motor heat dissipation.

[0067] Therefore, in some preferred embodiments of the present application, as shown in Figs. 2 and 3, the side wall 212 of the high-speed motor 2 adopts a non-uniform wall thickness. Figure 9 and Figure 10 As shown in Figs. 2 and 3, the wall thickness of the side wall 212 gradually thickens in the direction opposite to the rotation direction of the high-speed motor 2 until reaching a preset thickness D at the position of the first air outlet 73. Obviously, the preset thickness D is the normal thickness of the side wall 212 except the above-mentioned area.

[0068] By using the change of the wall thickness, the circumferential length of the first air outlet 73 through the shell can be set smaller. By using the change of the wall thickness, the radial distance between the sand, dust and impurities and the outer surface of the shell becomes smaller and smaller when they approach the first air outlet 73, so that they are thrown out quickly when reaching the first air outlet 73. In this way, the problem that the airflow is discharged in large quantities from the first air outlet 73 through a larger opening can be effectively avoided.

[0069] The heat dissipation channel 74 is provided through the rotor 24 of the high-speed motor 2, and the second air outlet 75 is provided through the side of the casing of the high-speed motor 2 facing the main centrifugal impeller 1. Specifically, the heat dissipation channel can be one or multiple, and multiple heat dissipation channels 74 can be provided at intervals in the circumferential direction. The second air outlet 75 can also be one or multiple, and when the casing of the motor adopts the form of a front cover 211, a side wall 212 and a rear cover 213 that can be detachably connected as shown in the above figures, each second air outlet 75 penetrates the front cover 211. The aperture and number of the heat dissipation channel 74, and the aperture and number of the second air outlet 75 can be set according to the need for heat dissipation of the high-speed motor 2.

[0070] Referring to Figure 7 and Figure 8 , as the airflow is continuously driven radially outward by the dust removal impeller 72 and rotates circumferentially on the inner surface of the motor casing, in addition to a part of the airflow being thrown away from the casing of the motor together with sand, dust and impurities, the remaining airflow further enters the heat dissipation channel 74, after heat exchange with the rotor 24 of the high-speed motor 2, the heated airflow flows out of the casing of the motor along the second air outlet 75, and finally realizes dust removal and heat dissipation of the high-speed motor 2.

[0071] The integrated high-speed centrifugal fan provided by the embodiment of the application integrates the main centrifugal impeller 1, the high-speed motor 2 and the control unit through the support part 4, and sets a dust removal and heat dissipation structure on the high-speed motor 2. Before introducing external airflow to heat exchange with the stator rotating at high speed inside the motor, the dust removal impeller 72 cooperates with the first air outlet 73 to filter sand, dust and impurities in the airflow, thereby avoiding the damage caused by sand and dust particles contained in the airflow directly driven into the heat dissipation channel to the rotor 24 and other structures.

[0072] In some preferred embodiments, as shown in Figure 7 , Figure 8 The dust removal and heat dissipation structure further includes a dust collecting ring 26 fixedly connected to the inner side of the casing of the high-speed motor 2, and the axial position thereof is located between the first air outlet 73 and the rotor 24 of the high-speed motor 2. The thickness thereof gradually expands towards the side away from the main centrifugal impeller 1 along the radial direction from the outside to the inside, thereby forming a structure capable of accommodating sand, dust and impurities not thrown out of the first air outlet 73.

[0073] Figure 11 It is shown that in some specific embodiments, the structure of the dust removal impeller, Figure 12 is an axial sectional view of the dust removal impeller, and the circle II part is shown enlarged, referring to Figure 11 , Figure 12The dust removal impeller 72 comprises, in sequence along the axial direction, a flow guide ring 721, a plurality of dust removal blades 723, and a fixing disc 722. The flow guide ring 721 and the fixing disc 722 are respectively close to the air inlet 71 and the rotor 24. The dust removal blades 723 are arranged in a circumferential direction and are fixedly connected with the flow guide ring 721 and the fixing disc 722. The number of the dust removal blades 723 can be determined according to the air volume demand for heat dissipation of the motor.

[0074] Further, the flow guide ring 721 comprises a first annular region 7211 and a first flow guide structure 7212. The first annular region 7211 is fixedly connected with the dust removal blades 723. The first flow guide structure 7212 is curved from the outside to the inside along the radial direction and towards the air inlet 71. The fixing disc 722 comprises a second annular region 7221, an inner concave disc 7222, and a second flow guide structure 7223. The second annular region 7221 is fixedly connected with the dust removal blades 723. The inner concave disc 7222 has an inner concave shape gradually shrinking from front to back along the axial direction and is fixedly connected with the motor shaft 25. The second flow guide structure 7223 is curved from the outside to the inside along the radial direction and towards the air inlet 71.

[0075] The dust removal impeller 72 is actually a centrifugal impeller for changing the axial air inlet into radial air outlet. Obviously, the air inlet direction of the dust removal impeller 72 is opposite to that of the main centrifugal impeller 1. Since the core purpose of the dust removal impeller 72 is to drive the airflow entering the casing of the high-speed motor 2 to rotate along the circumferential direction on the inner surface of the casing as soon as possible, in order to make full use of the airflow entering the motor and shorten the path length of the radial guidance of the airflow (the shortening of the guidance path is particularly beneficial to reduce the power consumption of the high-speed motor 2 in driving the dust removal impeller 72, i.e. to avoid the high-speed motor 2 from consuming too much energy for heat dissipation, resulting in excessive loss of energy for driving the main centrifugal impeller 1), the width of the flow guide ring 721 can be set to be relatively narrow and the position of the flow guide ring 721 can be as far outward as possible. In some preferred embodiments, unlike the conventional centrifugal impeller, the flow guide ring 721 is extremely close to the side wall 212 of the motor casing. Preferably, the outer diameter of the flow guide ring 721 is greater than the maximum radial distance of the air inlet 71, and the inner diameter of the flow guide ring 721 is not less than 90% of the maximum radial distance of the air inlet 71. Through such a setting, the airflow of the high-speed motor 2 passing through the air inlet 71 can form a circumferential rotating airflow more quickly, effectively reducing the power consumption of the high-speed motor 2 in driving the dust removal impeller 1.

[0076] In some preferred embodiments, the first annular region 7211 and the second annular region 7221 are arranged horizontally along the radial direction at the outlet of the dust removal blades 723, or are arranged substantially horizontally. Further, in the axial cross section of the dust removal impeller 72, the width of the region between the flow guide ring 721 and the fixing disc 722 first shrinks and then remains unchanged, or first shrinks and then expands, along the radial direction from the inside to the outside. Through such a structural arrangement, it can effectively prevent the external airflow from generating an axial speed after entering the casing, resulting in that the external airflow does not pass through the dust removal process of the first air outlet 73, i.e. directly enters the heat dissipation channel 74.

[0077] In some preferred embodiments, as shown in the figures above, the maximum diameter of the second annular region 7221 is less than or equal to the maximum diameter of the first annular region 7211. Reducing the maximum diameter of the second annular region 7221 can expand the flow channel of the airflow after dust removal, and further reduce flow loss.

[0078] As analyzed above, in order to optimize the integration of the equipment, the distance between the high-speed motor 2 and the main centrifugal impeller 1 is set relatively close. This will cause the heat-exchanged airflow discharged from the second outlet 75 to accumulate between the rear plate 12 of the main centrifugal impeller 1 and the front cover 211 of the high-speed motor 2, which is not conducive to the discharge of hotter gas. Therefore, in some preferred embodiments, the main centrifugal impeller 1 is also provided with an auxiliary heat dissipation structure to form a negative pressure zone between the rear plate 12 and the second outlet 75, so as to generate a strong suction force on the hotter airflow discharged from the second outlet 75 and guide it to be thrown out radially.

[0079] Figure 13 A preferred embodiment of the main centrifugal impeller 1 with this auxiliary heat dissipation structure is shown. Figure 14 Its top view, Figure 15 It is a half-sectional view, with the cutting line being... Figure 14 DD line in the middle, Figure 16 for Figure 15 A magnified diagram of section IV in the middle circle, see reference. Figures 13 to 16 The auxiliary heat dissipation structure includes several heat dissipation blades 14 and a heat dissipation guide ring 15.

[0080] The heat dissipation blades 14 are arranged circumferentially on the outer surface of the rear plate 12 facing the high-speed motor 2. Similarly, the number of them can be determined according to the need to radially guide the airflow discharged from the second air outlet 75 (for example, 5, 6 or more heat dissipation blades 14). The height of each heat dissipation blade 14 gradually decreases radially from the inside to the outside. The heat dissipation guide ring 15 is fixedly connected to the side of the heat dissipation blades 14 facing the high-speed motor 2. The middle area of ​​the ring has a circular hole for airflow to pass through, and the diameter of the circular hole, that is, the inner diameter of the heat dissipation guide ring 15, is greater than the maximum radial distance between the second air outlet 75 and the axis of the high-speed motor 2.

[0081] Figure 17 A cross-sectional view of the main centrifugal impeller 1 and the high-speed motor 2, which are equipped with the auxiliary heat dissipation structure, is shown. Figure 18 right Figure 17 The circle V in the image is enlarged, as shown below. Figure 17 , Figure 18As shown, during the rotation of the main centrifugal impeller 1 driven by the high-speed motor 2, the rear disc 12, heat dissipation blades 14, and heat dissipation guide ring 15 will form a shape similar to a centrifugal impeller. As the heat dissipation blades 14 rotate continuously, a negative pressure area will be formed in the center of the heat dissipation guide ring, thereby continuously drawing in the heat-exchanged airflow discharged from the second air outlet 75 and discharging it radially between the rear disc 12 and the heat dissipation guide ring 15. This auxiliary heat dissipation structure can effectively solve the problem of airflow accumulation between the high-speed motor 2 and the main centrifugal impeller 1 after heat dissipation, effectively improving the motor's heat dissipation efficiency.

[0082] As can be seen from the embodiments provided above, the integrated high-speed centrifugal fan provided in this application includes, in addition to the main centrifugal impeller 1 used to achieve the core ventilation effect, a dust removal impeller 72 used for dust removal and driving airflow into the heat dissipation channel during the heat dissipation process of the high-speed motor 2. Furthermore, in some preferred embodiments, an auxiliary heat dissipation structure is also included, located at the rear of the main centrifugal impeller 1. These different structures all play a role in guiding the airflow from axial motion to radial motion during the rotation of the high-speed motor 2. However, due to their different placement positions, different purposes of guiding the airflow, and different constraints, their overall and local shapes and dimensions are very different. Therefore, reasonably coordinating the former two, or the cooperation relationship between the former two and the latter, can be more conducive to achieving long-term stable operation of the high-speed motor while meeting the ventilation requirements.

[0083] Figure 19 A separate schematic diagram of the dust collector impeller 72 and the main centrifugal impeller (with auxiliary heat dissipation structure) is shown. Figure 20 for Figure 19 Cross-sectional views of the EE line, FF line, and GG line. Figure 21 for Figure 19 HH-line cross-sectional view.

[0084] pass Figure 20 , Figure 21It can be seen that for the main centrifugal impeller 1, its core function is to achieve the required ventilation index of the device, and it needs to be driven by the central inlet, and the length of the flow channel is extended to achieve the best driving effect on a large amount of airflow, so the axial length and chord length of the centrifugal blade 13 are the longest among the three types of centrifugal impeller structures; for the dust removal impeller 72, its function is to cooperate with the air inlet 71 arranged at the edge to guide the airflow entering the high-speed motor 2 to the inner surface of the shell to generate circumferential flow with as little energy consumption as possible (because the energy consumed for heat dissipation of the high-speed motor 2 is also generated by the motor, and the effect of this part of energy is too large, which will inevitably affect the working efficiency of the main centrifugal impeller 1), so the dust removal blade 723 of the dust removal impeller 72 is arranged to be short and thick in overall wing type, and the axial length and chord length are relatively short, the position is close to the side wall of the high-speed motor 3, and the number of blades is relatively large; for the auxiliary heat dissipation structure, due to the limitation of the integrated structure of the main centrifugal impeller 1 and the high-speed motor 2, the axial length of the heat dissipation blade 14 is the shortest, and at the same time, the chord length needs to be appropriately lengthened, so as to guide the airflow discharged from the second air outlet 75 with high efficiency under the premise of not consuming too much energy.

[0085] Therefore, in some preferred embodiments, the ratio of the minimum axial length h2_min of the dust removal blade 723 to the minimum axial length h1_min of the centrifugal blade 13 is less than or equal to 1:10, and in other preferred embodiments, the ratio of the minimum axial length h2_min of the dust removal blade 723 to the minimum axial length h3_min of the heat dissipation blade 14 is greater than or equal to 3:1.

[0086] In some preferred embodiments, the ratio of the chord length S2 of the dust removal blade 723 to the chord length S1 of the centrifugal blade 13 is less than or equal to 1:8, and in other preferred embodiments, the ratio of the chord length S2 of the dust removal blade 723 to the chord length S3 of the heat dissipation blade 14 is less than or equal to 1:6.

[0087] In some preferred embodiments, the number of centrifugal blades 13 is greater than or equal to 5 and less than or equal to 9; in other preferred embodiments, the number of dust removal blades 723 is greater than or equal to 19 and less than or equal to 27; and in other preferred embodiments, the number of heat dissipation blades 14 is greater than or equal to 5 and less than or equal to 9.

[0088] The specific embodiments of the present application are described in detail above, and for those skilled in the art, without departing from the principles of the present application, some improvements and modifications can be made to the present application, and these improvements and modifications also belong to the protection scope of the claims of the present application.

Claims

1. An integrated high-speed centrifugal fan, comprising a main centrifugal impeller, a high-speed motor, a control unit, and a support unit, wherein the high-speed motor, under the control of the control unit, drives the main centrifugal impeller to rotate via its motor shaft, and the support unit supports the main centrifugal impeller, the high-speed motor, and the control unit, characterized in that... The high-speed motor is equipped with a dust removal and heat dissipation structure, which includes: The air inlet is located through the housing of the high-speed motor on the side facing away from the main centrifugal impeller; The dust collector impeller is positioned between the air inlet and the stator of the high-speed motor and is fixedly connected to the motor shaft of the high-speed motor. The first air outlet is disposed through the side wall of the housing of the high-speed motor, and the axial positions of the first air outlet and the dust collector impeller are matched with each other. A heat dissipation channel is set through the stator of the high-speed motor; The second air outlet is disposed through the high-speed motor housing on the side facing the main centrifugal impeller; The dust removal impeller includes a guide ring arranged sequentially along the axial direction, a number of dust removal blades, and a fixed disc; The guide ring and the fixed disk are respectively close to the air inlet and the stator of the high-speed motor, and the plurality of dust removal blades are arranged at intervals along the circumference and are fixedly connected to the guide ring and the fixed disk; On the axial section of the dust collector impeller, the width of the area between the guide ring and the fixed disk first contracts and then remains constant, or first contracts and then expands, from the inside to the outside in the radial direction. The guide ring includes a first annular region and a first guide structure, wherein the first annular region is fixedly connected to the dust removal blade, and the first guide structure bends radially from the outside to the inside toward the air inlet; The fixed disk includes a second annular region, a concave disk, and a second flow guiding structure. The second annular region is fixedly connected to the dust removal blades. The concave disk has a concave shape that gradually shrinks from front to back along the axial direction and is fixedly connected to the motor shaft. The second flow guiding structure bends radially from the outside to the inside toward the air inlet.

2. The integrated high-speed centrifugal fan according to claim 1, characterized in that, The side wall thickness of the high-speed motor housing gradually increases at the first air outlet in the opposite direction to the rotation direction of the high-speed motor until a preset thickness is reached.

3. The integrated high-speed centrifugal fan according to claim 2, characterized in that, The dust removal and heat dissipation structure also includes a dust collection ring, which is fixedly connected to the inner side of the housing of the high-speed motor, and the axial position of the dust collection ring is located between the first air outlet and the stator of the high-speed motor.

4. The integrated high-speed centrifugal fan according to claim 1, characterized in that, The main centrifugal impeller includes a front disc, several centrifugal blades, and a rear disc arranged sequentially along the axial direction; The rear disc is fixedly connected to the motor shaft of the high-speed motor; The plurality of centrifugal blades are arranged at circumferential intervals and are fixedly connected to the front plate and the rear plate.

5. The integrated high-speed centrifugal fan according to claim 4, characterized in that, The ratio of the minimum axial length of the dust removal blade to the minimum axial length of the centrifugal blade is less than or equal to 1:

10. The ratio of the chord length of the dust removal blade to the chord length of the centrifugal blade is less than or equal to 1:

8.

6. The integrated high-speed centrifugal fan according to claim 4, characterized in that, An auxiliary heat dissipation structure is also provided on the rear disc of the main centrifugal impeller to increase the flow rate of the airflow discharged from the second air outlet as it radially propels away from the high-speed motor.

7. The integrated high-speed centrifugal fan according to claim 6, characterized in that, The outer surface of the rear disc facing the high-speed motor is parallel to the outer surface of the high-speed motor housing facing the main centrifugal impeller and the distance between them does not exceed 20mm. The auxiliary heat dissipation structure includes several heat dissipation blades and a heat dissipation guide ring; The heat dissipation blades are circumferentially spaced on the outer surface of the rear disc facing the high-speed motor, and the height of the heat dissipation blades gradually decreases radially from the inside to the outside. The heat dissipation guide ring is fixedly connected to the side of the heat dissipation blade facing the high-speed motor, and the inner diameter of the heat dissipation guide ring is greater than the maximum radial distance between the second air outlet and the axis of the high-speed motor.

8. The integrated high-speed centrifugal fan according to claim 7, characterized in that, The ratio of the minimum axial length of the dust removal blade to the minimum axial length of the heat dissipation blade is greater than or equal to 3:

1. The ratio of the chord length of the dust removal blade to the chord length of the heat dissipation blade is less than or equal to 1:

6.

9. The integrated high-speed centrifugal fan according to claim 1, characterized in that, The support structure includes a front panel, a rear panel, and several support columns. The front panel and the rear panel are parallel to each other, and the plurality of support columns are fixedly connected between the front panel and the rear panel; The high-speed motor passes through the rear panel and is fixedly connected to the rear panel; The main centrifugal impeller is located between the front panel and the rear panel; A guide plate is provided on the front panel, the guide plate passes through the front panel, one end of which expands radially outward and is fixedly connected to the front panel, and the other end extends into the front plate of the main centrifugal impeller.

10. The integrated high-speed centrifugal fan according to claim 9, characterized in that, The control unit is housed in a dustproof electrical box, which is fixedly mounted on the outer surface of the rear panel facing away from the front panel.

Images