CN118293085A - Pure air-cooled high-power high-speed centrifugal fan - Google Patents

Abstract

The invention discloses a pure air-cooled high-power high-speed centrifugal fan, which comprises a casing and spiral cases arranged on two sides of the casing, wherein a rotating shaft mechanism for sucking outside air into the spiral cases on two sides is arranged in the casing; the stator in the rotating mechanism is provided with an end heat dissipation cover close to the energized winding at one end of the thrust disc, and heat conduction glue is filled in the end heat dissipation cover; an end part heat radiation plate is arranged between the end part of the energizing winding, which is close to one end of the small impeller, of the stator and the inner wall of the shell, and a plurality of heat pipes are embedded along the circumferential surface of the energizing winding; the shell is sleeved with an airflow cover and a plurality of air-cooling radiating fins arranged on the peripheral surface of the shell. The high-speed centrifugal fan provided by the invention has a simple structure, is convenient for daily maintenance, and can effectively utilize cooling air to reduce the temperature of the stator so as to improve the safety and service life of the fan.

Description

Pure air-cooled high-power high-speed centrifugal fan

Technical Field

The invention belongs to the field of centrifugal fan equipment design, and particularly relates to a pure air-cooled high-power high-speed centrifugal fan.

Background

In the application scenes of sewage treatment, pond oxygen supply, particle transportation and the like, the traditional Roots blower, the multistage centrifugal blower, the single-stage high-speed centrifugal blower and the like are replaced by the high-speed direct-drive centrifugal blower with more advanced technology, and the latter has higher efficiency, lower noise and more compact equipment. The typical technical route, namely the air suspension type high-speed centrifugal blower, has the advantages of high running speed, direct connection driving of a motor and a centrifugal impeller, high efficiency, adoption of high-speed variable frequency control, integration of various intelligent algorithms, realization of remote control and the like, and is the key development direction of the high-speed centrifugal blower.

In the high-speed centrifugal fan, the high-efficiency three-way centrifugal impeller rotates at a high speed under the drive of a shaft so as to throw out gas, and the shaft rotating at the high speed is driven by a stator. When the stator drives the rotating shaft, a large current exists in the stator, and the stator can continuously generate heat due to the existence of the resistor. In order to ensure the safety and the service life of the fan, the temperature of the stator needs to be controlled in a lower range, namely, the heat of the stator needs to be quickly transferred to the outside by a method.

The transfer of heat requires a medium, two types of which are commonly used, air and water. The cooling mode of conveying external cold air to the surface of a high-temperature object and discharging the cold air is called air cooling, and the cooling mode of absorbing heat in a pipeline and a matched heat conduction device and discharging the cold water is called water cooling, so that the two modes have advantages and disadvantages.

The air cooling is required to be provided with a power source, an air path is designed, and through various structural members and the mode of opening holes, the air can flow through the surface which needs heat dissipation as much as possible and then is discharged to the outside, so that heat transfer is completed. The air cooling device has the advantages of relatively simple structure, lower cost and good stability, and is not easy to fail. The disadvantage is that air acts as a poor conductor of heat and has limited heat conducting capacity, and is therefore commonly used in small power, small size fans.

The water cooling also needs to be provided with a power source and is designed into a pipeline, the pipeline is arranged by avoiding and opening the pipeline on the structural member, and a cold head which is used for physically isolating the heating element from the waterway and can efficiently conduct heat is also needed. The cooling water is usually recycled, and therefore, a cooling head and a fan for heat dissipation are also required to be designed reversely for cooling the heated water, and then the heated water enters the cooling head along a pipeline to absorb heat, namely, the heat transfer cycle is completed. The water is used as a substance with the highest specific heat capacity in nature, and is matched with a pipeline and a cold head with good design, so that the heat dissipation capacity is relatively stronger. However, the water cooling structure is relatively complex, various heat conducting and radiating structures are additionally arranged, and the fan is damaged once the water leaks from the pipeline due to short circuit easily caused by the water, so that high requirements are placed on the sealing performance of the pipeline. The cooling water still needs to set up filter equipment, for high-efficient conduction heat, can design various little water routes in the cold head generally, if there is impurity in the cooling water, very easily lead to the water route to block up, and then influence the radiating effect and damage the water pump even and lead to shutting down. In summary, the advantage of water cooling is that the heat dissipation capability is stronger, and the shortcoming is that the structure is complicated, and the cost is higher, and stability is lower, needs periodic inspection maintenance, is commonly used for high-power, jumbo size fan at present.

Patent document CN 115822990a discloses a back suction type high-speed centrifugal fan, including fan main part and erection support, the bottom integrated positioning of fan main part has fixed foot rest, fixed foot rest location is installed in the upper end position of erection support, the one end integrated connection of fan main part has the air-supply line, the other end integrated positioning of fan main part has the pipe dish, be connected with out the tuber pipe on the pipe dish, be connected with the air outlet on the play tuber pipe, the tip block location of air-supply line is installed and is filtered the frame. The device needs to be additionally provided with a cooling fan, and the heat conduction capacity of the device is limited only by cooling in one mode.

Disclosure of Invention

The invention aims to provide a pure air-cooled high-power high-speed centrifugal fan which is simple in structure, convenient to maintain daily and capable of effectively utilizing cooling air to reduce the temperature of a stator so as to improve the safety and the service life of the fan.

In order to achieve the purpose of the invention, the following technical scheme is provided: the high-speed centrifugal fan comprises a shell and spiral cases arranged at two sides of the shell, wherein a rotating shaft mechanism for sucking outside air into the spiral cases at two sides is arranged in the shell;

the rotating shaft mechanism comprises a rotating shaft, a stator and large impellers, wherein the stator is arranged in the middle section of the rotating shaft and used for driving the rotating shaft to rotate, the large impellers are arranged at the two ends of the rotating shaft, energized windings are arranged at the two ends of the stator along the axial direction of the rotating shaft, a thrust disc is arranged between the stator and the large impeller at one end of the rotating shaft, a small impeller is arranged between the stator and the large impeller at the other end of the rotating shaft, and the small impeller has the same rotation direction as the large impeller close to the small impeller;

The electrified winding of the stator, which is close to one end of the thrust disc, is provided with an end heat dissipation cover, and heat conduction glue is filled in the end heat dissipation cover;

an end part heat radiation plate is arranged between the end part of the energizing winding, which is close to one end of the small impeller, of the stator and the inner wall of the shell, a plurality of heat pipes are embedded along the circumferential surface of the energizing winding, each heat pipe is provided with a heat pipe heat radiation fin, and heat conducting glue is filled between the end part heat radiation plate and the end part of the energizing winding;

The air flow cover and the plurality of air cooling radiating fins are sleeved outside the machine shell, the cooling air inlet and the cooling air outlet are formed in the air flow cover, the cooling air is sent into the air flow cover through the expansion of the external radiating blower, and part of the cooling air which enters the air flow cover is guided by the small impeller to axially enter the stator, so that the radiating effect inside and outside the stator is improved.

Specifically, the heat pipe passes through the casing and exchanges heat with cooling air in the airflow cover, and heat conducting glue is filled between the heat pipe and the inner wall of the casing, so that the heat pipe is fixed in the casing, and meanwhile, the heat dissipation effect of the heat pipe is improved.

Specifically, the heat radiating fins corresponding to the heat pipes are distributed at intervals along the peripheral surface surrounded by the plurality of air-cooled heat radiating fins.

Specifically, the stator is also provided with an exhaust passage along the axial direction of the rotating shaft, and heat in the stator can be taken away through airflow.

Specifically, the airflow cover comprises an upper airflow cover and a lower airflow cover, the lower airflow cover is provided with a cooling air inlet, and the upper airflow cover is provided with a cooling air outlet.

Specifically, the cooling air outlet comprises a first cold air cooling air outlet and a second cooling air outlet, wherein the first cooling air outlet and the small impeller are arranged on the same vertical surface, and the second cooling air outlet and the end heat dissipation cover are arranged on the same vertical surface.

Specifically, the casing is close to little impeller one end and is equipped with the dodging hole that is used for the passage of circular telegram winding lead wire.

Specifically, dodge the hole and have a plurality ofly, a plurality of dodge the hole and arrange along casing global equiangular degree to dodge the hole as auxiliary cooling wind entry outside the dodge hole that is used for the circular telegram winding to pass through, can make things convenient for equipment installation debugging and daily maintenance, also can improve the radiating effect simultaneously.

Specifically, the rotating shaft is matched with a limiting mechanism, and the limiting mechanism comprises a thrust bearing, a front radial bearing and a rear radial bearing.

Compared with the prior art, the invention has the beneficial effects that:

The pure air cooling scheme is adopted, so that the structure of the fan is simplified, the material cost and the assembly cost of the fan are reduced, and the fan is convenient to maintain;

The air flow device has the advantages that a large amount of air flows through the rotating shaft, the heat conducting cover, the heat pipe and the radiating fins which are connected with the stator, the temperature of the whole machine is reduced, and the running safety and the service life of the fan are improved.

Drawings

Fig. 1 is a sectional view of a high-speed centrifugal fan provided in the present embodiment;

fig. 2 is a schematic diagram of an arrangement manner of air-cooled heat dissipation fins outside the casing according to the present embodiment;

FIG. 3 is a schematic diagram showing the cooling arrangement and structure of the stator according to the present embodiment;

FIG. 4 is a schematic diagram of an arrangement of an airflow shroud according to the present embodiment;

Fig. 5 is a schematic diagram of a cooling air path of the high-speed centrifugal fan according to the present embodiment;

Fig. 6 is a schematic view of a cooling air path at another view angle according to the present embodiment;

In the figure, 1, a volute; 2. a housing; 3. a stator; 4. a rotating shaft; 5. an airflow cover; 2-1, air-cooling radiating fins; 2-2, a bearing; 2-3, front radial bearing; 2-4, rear radial bearings; 3-1, a heat pipe; 3-2, leading-out wires of the motor; 3-3, heat pipe radiating fins; 3-4, an end heat dissipation cover; 3-5, electrifying the winding; 3-6, an exhaust channel; 3-7, heat-conducting glue; 3-8, end part heat dissipation plates; 4-1, a large impeller; 4-2, a thrust disc; 4-3, small impeller; 4-4, a shaft body; 5-1, an upper airflow cover; 5-2, a lower airflow cover; 5-3, cooling air inlet; 5-4, cooling air outlet.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

As shown in fig. 1 and 2, a schematic diagram of a high-speed centrifugal fan provided in this embodiment includes a volute 1, a casing 2, a stator 3, a rotating shaft 4, an airflow cover 5, and a plurality of air-cooled heat dissipation fins 2-1 closely arranged and fixed on an outer circle of the casing 2 and in good contact with the casing.

The rotating shaft mechanism is arranged at a corresponding position inside the casing 2 and comprises a stator 3, two large impellers 4-1, a thrust disc 4-2 and a small impeller 4-3 are all fixed on a shaft body 4-4 to jointly form a rotating shaft 4, the rotating shaft 4 is limited at a preset position by a thrust bearing 2-2, a front radial bearing 2-3 and a rear radial bearing 2-4, and two spiral cases 1 are respectively arranged at two sides of the casing 2.

When the fan works, the stator 3 is electrified to drive the rotating shaft 4, the large impeller 4-1 fixed on the rotating shaft 4 stably rotates in the volute 1 to do work, sucked gas is pressurized and discharged, and meanwhile, the small impeller 4-3 is also driven to rotate together, so that some gas is sucked from the left side and discharged from the hole of the casing 2.

As shown in fig. 3, fig. 3 (a) is a cooling arrangement of a stator, fig. 3 (b) is a schematic structural diagram of the stator, more specifically, the stator 3 is a thick-walled cylinder, an outer circle is directly contacted with a shell (2), a large amount of heat can be conducted to an air-cooled radiating fin 2-1 for discharge, two sides of the cylinder are electric windings 3-5 formed by copper wires, wherein the electric windings 3-5 on the right side are extended with a motor outgoing wire 3-2 for electric conduction, the electric windings 3-5 on the two sides are packaged in different manners, one side is provided with an end radiating cover 3-4, a heat conducting adhesive 3-7 is filled between the two electric windings, a large amount of heat can be taken away by air flowing through the end radiating cover 3-4, the other side is provided with the electric windings 3-5 of the motor outgoing wire 3-2, a plurality of heat pipes 3-1 are arranged on the electric windings 3-5, each heat pipe 3-1 is provided with the heat radiating fin 3-3, the heat on the electric windings 3-5 can be conducted to the electric windings 3-3, the air can be taken away by blowing, in addition, the air can be taken away by the air, the heat can be also provided with the end radiating fins 3-8 and the heat can be taken away by the heat conducting adhesive 3-7, and the other part is filled in the heat radiating part 3-2 through the inner part and the heat radiating cover, and the heat is provided with the heat conducting adhesive 3-2, and the heat is discharged to the inner part and the heat radiating part is provided with the heat radiating part 3-2.

As shown in fig. 4, the airflow cover 5 is formed by splicing an upper airflow cover 5-1 and a lower airflow cover 5-2, the air cooling radiating fins 2-1 and the heat pipe radiating fins 3-3 on the casing 2 are wrapped, the lower airflow cover 5-2 is provided with a cooling air inlet 5-3, cooling air blown out by an external radiating blower enters from the cooling air inlet, the upper airflow cover 5-1 is provided with a cooling air outlet 5-4, and meanwhile, the small impeller 4-3 is utilized to rotate so as to guide part of cooling air to enter the air exhaust channel 3-7 of the stator along the axial direction, so that the purpose of synchronous heat dissipation inside and outside the stator is realized.

More specifically, the cooling air inlets 5-3 are provided with two cooling air inlets to improve the amount of cooling air entering the airflow cover 5, meanwhile, one end of the casing 2, which is close to the small impeller 4-4, is provided with a plurality of avoidance holes for passing through the lead wires of the electrified winding, the plurality of avoidance holes are distributed along the circumferential surface of the casing at equal angles, and the avoidance holes except the avoidance holes for passing through the electrified winding are used as auxiliary cooling air inlets, so that equipment installation and debugging and daily maintenance can be facilitated, and meanwhile, the heat dissipation effect can be improved.

And the cooling air outlet 5-4 includes a first cool air outlet arranged with the small impeller 4-4 in a vertical plane and a second cooling air outlet arranged with the end radiator cover 3-4 in a vertical plane.

As shown in fig. 5 and 6, a schematic diagram of a cooling air path is provided in this embodiment, in which < numeral > represents a path number of a cooling air flow, ①、②、③ and the like represent a flow direction number of the cooling air in a transverse cross-sectional view, when the fan works, an air inlet 5-3 of a cooling air inlet 5-2 of a lower airflow cover 5-2 is divided into two paths, and when the cooling air enters from <2>, the cooling air flows through a cooling fin 2-1 and a heat pipe cooling fin 3-3 according to ①、②、⑦ and ⑧ paths in fig. 6 to take away heat and is discharged from <9 >; when cooling air enters the groove on the shell 2 from <3>, the cooling air is divided into <4> (corresponding to ③、⑥ in fig. 6) and <5> (corresponding to ④、⑤ in fig. 6) respectively, heat on the end heat dissipation cover 3-4 is taken away, and finally the cooling air is discharged from the part <8 >; wherein <5> (④、⑤ in FIG. 6) is divided into <6> <7> and flows through the exhaust passage 3-5, the inner circle of the stator (3) and the gap of the surface of the rotating shaft 4 respectively, and then the gaps are converged at <13 >; when cooling air enters from the position <10>, the air is separated left and right at the position <11> after entering, flows through the air cooling radiating fins 2-1 and the heat pipe radiating fins 3-3 according to the ①、②、⑦、⑧ path in FIG. 6 to take away heat, and is discharged from the position <12 >; the air flow at the auxiliary cooling air inlet <14> enters from the hole opened on the casing (2), is sucked by the small impeller 4-3 at the <13> together with the air flow at the previous <6> and <7>, is discharged to the <15>, and is discharged at the <16> through the slot formed in the casing 2.

In summary, the device provided in this embodiment may not use a water cooling scheme with complex structure, high price and difficult maintenance, but use a pure air cooling scheme with simple structure, low price and convenient maintenance by increasing the air cooling heat dissipation power, that is, by adopting designs of increasing the heat dissipation area, improving the heat conduction mode, increasing the flow velocity and flow of the heat dissipation air.

(1) By adopting the pure air cooling scheme, the structure of the fan is simplified, the material cost and the assembly cost of the fan are reduced, and the maintenance is convenient.

(2) The air flow device has the advantages that a large amount of air flows through the stator, the rotating shaft, the heat conducting cover, the heat pipe and the radiating fins which are connected with the stator and the rotating shaft, the temperature of the whole machine is reduced, and the running safety and the service life of the fan are improved.

Furthermore, the terms "upper," "lower," "inner," "outer," "front," "rear" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The relative steps, numerical expressions and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise.

It is understood that the foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, but rather is to be accorded the full scope of all such modifications and equivalent structures, features and principles as set forth herein.

Finally, it should be noted that: the above examples are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention, but it should be understood by those skilled in the art that the present invention is not limited thereto, and that the present invention is described in detail with reference to the foregoing examples: any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or perform equivalent substitution of some of the technical features, while remaining within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (9)

1. The high-speed centrifugal fan is characterized by comprising a shell and spiral cases arranged at two sides of the shell, wherein a rotating shaft mechanism for sucking outside air into the spiral cases at two sides is arranged in the shell;

the rotating shaft mechanism comprises a rotating shaft, a stator and large impellers, wherein the stator is arranged in the middle section of the rotating shaft and used for driving the rotating shaft to rotate, the large impellers are arranged at the two ends of the rotating shaft, energized windings are arranged at the two ends of the stator along the axial direction of the rotating shaft, a thrust disc is arranged between the stator and the large impeller at one end of the rotating shaft, a small impeller is arranged between the stator and the large impeller at the other end of the rotating shaft, and the small impeller has the same rotation direction as the large impeller close to the small impeller;

The electrified winding of the stator, which is close to one end of the thrust disc, is provided with an end heat dissipation cover, and heat conduction glue is filled in the end heat dissipation cover;

an end part heat radiation plate is arranged between the end part of the energizing winding, which is close to one end of the small impeller, of the stator and the inner wall of the shell, a plurality of heat pipes are embedded along the circumferential surface of the energizing winding, each heat pipe is provided with a heat pipe heat radiation fin, and heat conducting glue is filled between the end part heat radiation plate and the end part of the energizing winding;

the shell is sleeved with an airflow cover and a plurality of air-cooled radiating fins arranged on the peripheral surface of the shell, and the airflow cover is provided with a cooling air inlet and a cooling air outlet.

2. The high-power high-speed centrifugal fan with pure air cooling according to claim 1, wherein the heat pipe penetrates through the shell to perform heat exchange with cooling air in the airflow cover, and heat conducting glue is filled between the heat pipe and the inner wall of the shell.

3. The pure air-cooled high-power high-speed centrifugal fan according to claim 1, wherein the heat radiating fins corresponding to the heat pipes are arranged at intervals along the peripheral surface surrounded by the plurality of air-cooled heat radiating fins.

4. The high-speed centrifugal fan with pure air cooling and high power according to claim 1, wherein the stator is further provided with an exhaust passage along the axial direction of the rotating shaft.

5. The high-power high-speed centrifugal fan with pure air cooling function according to claim 1, wherein the airflow cover comprises an upper airflow cover and a lower airflow cover, the lower airflow cover is provided with a cooling air inlet, and the upper airflow cover is provided with a cooling air outlet.

6. The high-power high-speed centrifugal fan with pure air cooling according to claim 5, wherein the cooling air outlet comprises a first cold air cooling air outlet and a second cooling air outlet, the first cooling air outlet is arranged with a small impeller on the same vertical plane, and the second cooling air outlet is arranged with an end heat dissipation cover on the same vertical plane.

7. The pure air-cooled high-power high-speed centrifugal fan according to claim 1, wherein the end of the casing, which is close to the small impeller, is provided with a avoiding hole for passing through a lead wire of the energized winding.

8. The high-power high-speed centrifugal fan with pure air cooling according to claim 7, wherein a plurality of avoidance holes are arranged along the circumferential surface of the shell at equal angles, and the avoidance holes except the avoidance holes for passing through the energized winding are used as auxiliary cooling air inlets.

9. The high-speed centrifugal fan with pure air cooling and high power according to claim 1, wherein the rotating shaft is matched with a limiting mechanism, and the limiting mechanism comprises a thrust bearing, a front radial bearing and a rear radial bearing.