KR100798084B1 - Miniature Air Blower apparatus - Google Patents

Abstract

The present invention relates to a two-stage blower in the form of a centrifugal compressor, which is miniaturized by integrating the structure due to the elimination of existing axial thrust pads and the use of a single journal bearing, and guide before the impeller suction stage. The present invention relates to an air blower device that improves the efficiency of a blower by installing a vane cooling fin to impart a swirling component to a flow.

The small air blower apparatus according to the present invention is configured to symmetrically constitute a thrust bearing housing, a shroud & volute housing, a main housing, and a BLDC motor (Brushless DC Motor) to drive the rotating body at high speed. An air foil bearing is coupled to the inner surface of the stator to generate a rotational force, an impeller blade is formed spirally on the outside, and is rotated according to the rotational force of the motor to impart air into the blower, and the motor part. A shaft for transmitting the rotational force to the impeller, a thrust bearing for assisting the rotation of the impeller, a diffuser for discharging air according to the rotation of the impeller, and an intake port through which the air is sucked in accordance with the rotation of the impeller. Characterized in that configured to include.

Impellers, shafts, cooling pins for guide vanes, journal bearings, stators.

Description

Miniature Air Blower apparatus

1 is a cross-sectional view of a ball bearing blower according to the prior art.

2 is a cross-sectional view of an air foil bearing blower according to the prior art.

3 is a sectional view of a small blower according to the present invention.

4 is an external view of a small blower according to the present invention.

5 is a detailed structural diagram of the journal bearing of FIG.

6 is a side view of the blade portion of the shaft.

7 is a three-dimensional view of the blade portion of the shaft.

8 is a detailed structural diagram of the dual magnet structure of FIG. 3.

9 is a conceptual diagram of an air-cooled cooling fin used in a blower according to the prior art.

10 is a conceptual diagram of an air-cooled cooling fin used in a small blower according to the present invention.

11 is a top view of the guide vane cooling fin according to the present invention.

12 is a front view of the guide vane cooling fins according to the present invention.

13 is a sectional view of a small blower equipped with a cooling pipe according to the present invention.

14 is a conceptual diagram of a cooling pipe in the form of a coil according to the present invention.

<Explanation of symbols for the main parts of the drawings>

210: thrust bearing (air foil bearing) housing 220: shroud & volute housing

230: main housing 310: stator housing

240: impeller 320: shaft

330: permanent magnet 250: impeller fixing nut

340: Cooling fin for the guide vane 350: Stator

260: diffuser 360: journal bearing (air foil bearing)

270: thrust bearing (air foil bearing) 280: inlet

290: seal cover 370: cured resin

The present invention relates to a two-stage blower in the form of a centrifugal compressor, which is miniaturized by integrating the structure due to the elimination of existing axial thrust pads and the use of a single journal bearing, and guide before the impeller suction stage. It is related to an air blower device in which a vane cooling fin is installed to impart a swirling component to the flow to increase the efficiency of the blower, and to add a coil type cooling pipe using a refrigerant to the blower characterized by operation at a high speed or higher.

Air flow generating device is used in the air supply device of the combustion device, the air conditioning device inside the plant, the ventilation device of the car, and the like to move the air. There are a fan, a compressor, and a blower. .

In addition, the air flow generating device is applied as an air supply device of a fuel cell device that can replace a device for generating energy using a conventional fossil fuel, and generates a mica for generating electricity by reacting with a hydrogen fuel. As part of the mechanism, it supplies air containing oxygen to the cathode of the stack.

Conventional air blower devices are a hybrid blower of a mixed type supported by a ball bearing as shown in FIG. 1 and a turbo blower capable of actively adjusting the impeller tip clearance as shown in FIG. 2 (Korean Patent Application No. 2005-0037006).

Mixed type turbo blowers supported by ball bearings have a simple structure by applying ball bearings, but there are problems of heat generation, noise and vibration caused by friction due to contact between solid and solid bearings, and energy due to frictional force (power ) Consumption was relatively large. In addition, there is a problem that the life of the device is shortened due to the above problem and has a lower performance than the expected performance of the device.

The turbo blower, which can actively adjust the impeller tip clearance, applies PVDF sensors and PZT actuators to thrust air foil bearings when thrusters rotate axially. As a possible invention, a journal bearing was used in addition to a ball bearing supporting a high speed rotating body by rotating at a high speed of 30,000 rpm or more basically.

Journal bearings have the advantages of relatively low friction at high speed and stability in operation. Oil journal bearings and air journal bearings have been mainly used.

The air supply using journal bearings is also applied to the air supply of the BOP (Balance of Plant) of the plant equipment, industrial devices, transportation equipment and fuel cell equipment. However, currently applied air supply device has a disadvantage in that it takes up a considerable amount of volume and weight in the whole device, and productivity is low due to the complexity of assembly and a small number of components.

The present invention has been made to solve the inconvenience of the prior art as described above,

It is an object of the present invention to provide a compact and simple structure air supply device by integrating the structure due to the elimination of existing axial thrust pads and the use of a single journal bearing.

It is another object of the present invention to provide a highly efficient air supply device in which a guide vane cooling fin is installed before the impeller suction stage to impart swirling components to the flow to increase the efficiency of the blower.

Still another object of the present invention is to provide an air supply apparatus capable of fast cooling by mounting a coil-type cooling pipe using a refrigerant in a blower characterized by a high speed rotation or higher operation.

In order to achieve the above object, the small air blower device according to the present invention is configured to be symmetrically configured to the thrust bearing housing, the shroud & volute housing, the main housing, and the BLDC motor (Brushless DC Motor) constituting the outside of the air blower device. In the stator for driving the rotor at high speed, the air foil bearing is coupled to generate a rotational force, and an arc-shaped guide vane cooling for cooling the air introduced to the motor part and providing a turning component. An impeller blade spirally formed on the outside of the pin, the impeller rotating in accordance with the rotational force of the motor unit to introduce air into the blowee, a shaft transmitting the rotational force of the motor unit to the impeller unit, and Thrust bearing supporting the axial direction, and increasing the pressure of the flow passing through the Depending on which the diffuser and the rotation of the impeller including an intake passage through which air is sucked is characterized in that configured.

The rear surface of the impeller of the small air blower device according to the present invention is characterized in that the thrust collar for supporting the load in the axial direction of the thrust air foil bearing.

A seal cover for sealing between the shaft and the thrust bearing housing is mounted on the hole shape of the thrust bearing housing of the compact air blower device according to the present invention.

The permanent magnet is arranged at one end of the motor side of the shaft of the small air blower device according to the present invention to buffer the force in the axial direction due to the attractive force with the permanent magnet arranged in the stator housing which is the outer case of the motor. Characterized in that the dual magnet structure can be formed.

In the shaft of the small air blower apparatus according to the present invention, a plurality of blades for air flow are installed on the dual magnet side, that is, on the side of the shaft end, and the air flows while rotating together along the shaft to generate the flow of air. The blade unit for dissipating heat is characterized in that it is coupled.

The guide vane cooling fin of the small air blower device according to the present invention is characterized in that the front of the air flow hole is formed.

The small air blower device according to the present invention is characterized in that a cooling pipe part using a refrigerant is installed between the cooling fan for the guide vane and the motor.

The cooling pipe part of the small air blower apparatus according to the present invention is a refrigerant supply pipe which is coupled to the outside of the small blower apparatus and is a passage through which the refrigerant flowing by the refrigerant pump flows into the small blower apparatus. And a coil for cooling coil coupled between the guide vane cooling fin and the outside of the motor and absorbing the heat of the motor as a refrigerant flowing therein, and cooling the absorbing heat of the motor in the cooling pipe. And a coolant discharge pipe through which one coolant is discharged, and an external heat generator for cooling the coolant discharged from the coolant discharge pipe to discharge heat to the outside.

Hereinafter, a small air blower according to the present invention through a preferred embodiment looks at in more detail.

3 is a cross-sectional view of the small turbo blower according to the first embodiment of the present invention, and FIG. 4 is an outline view of the small turbo blower.

The small air blower device according to the first embodiment of the present invention is an air blower device for a general rotation, and as shown in FIG. 3, the outside of the small air blower device in which a double blower is symmetrically configured on one axis is shown. The thrust bearing housing 210, the shroud & volute housing 220, the main housing 230, and the motor unit generating the rotational force and a blade are formed spirally on the outside, and rotate according to the rotational force of the motor unit to blow air. An impeller 240 to flow into the stomach, a thrust bearing 270 supporting the axial direction of the rotor, a diffuser 260 to increase the pressure of the flow, and a suction port 280 that is a passage through which air is sucked; It consists of a seal cover 290 coupled to the thrust bearing housing 210.

The impeller 240, the nut 250, the shaft 320 of the motor unit 320, the permanent magnet 330, and the dual magnet 315 mounted to the shaft are collectively referred to as a rotating body.

The basic structure of the motor unit is a brushless DC motor (Brushless DC Motor), the stator housing 310 constituting the outside of the motor and the permanent magnet 330 and the permanent magnet 330 which rotates at the start of the motor and the motor is rotated Stator 350 to generate a magnetic force for rotating) and the journal bearing 360 to assist the rotation of the rotor and the stator 350 using the air sucked from the inlet 280 in accordance with the rotation of the rotor Guide vane cooling pin for cooling the 340 and the rotation of the permanent magnet 330 is composed of a shaft 320 for transmitting to the impeller 240. In addition, a dual magnet structure 315 is installed between the stator housing 310 and the stator 350 of the motor unit to reduce axial position fixation and unstable movement, and both ends of the shaft 320 to fix the impeller 240. Nut 250 was used and the journal bearing is seated in a housing made of cured resin 370.

After the motor unit forms the journal bearing housing with hardened resin 370 on the inner surface of the stator 350 of the motor as shown in FIG. 3, the length of the journal bearing 360 supporting the radial direction of the shaft 320 is shown. Both ends of the direction are fixed to the inner surface of the hardening resin 370, thereby reducing the space occupied by the journal bearing of the conventional blower, thereby reducing the overall volume of the blower.

The rear surface of the impeller 240 supports the axial load instead of the thrust pad 100 supporting the axial load of the turbo blower to which the conventional air foil bearing shown in FIG. Decrease.

The journal bearing 360 is an air foil bearing for stably rotating the rotor at high speed, and a top gun coupled to the motor shaft 361 and the journal bearing housing 369 connected to the shaft 320 as shown in FIG. 5. Bump foil 366 coupled between work 363 and top foil 363 and motor shaft 361 and journal bearing housing 369 constituting the exterior of the bearing.

Journal bearing 360 is an oil-free bearing that does not use lubricating oil, which is advantageous in terms of eco-friendliness, economy, and stability at high speed.

6 is a side view of the blade portion 325 of the shaft 320 and FIG. 7 is a three-dimensional view of the blade portion 325.

The stator housing 310 is coupled to the stator 350, and the shaft 320 inserted therein is coupled to a blade portion 325 having a plurality of blades installed at one end of the motor as shown in FIG. As the shaft 320 rotates, the blade unit 325 rotates to generate a flow of air, thereby dissipating heat generated by the driving of the motor.

This phenomenon can reduce the thermal change of the motor and the permanent magnet 330 to increase the motor efficiency, as well as reduce the gap change of the journal bearing 360 can be obtained to drive the effect stably.

8 is a detailed structural diagram of the dual magnet structure of FIG. 3.

The dual magnet structure 315 is a structure for obtaining the effect of reducing the axial position fixation and unstable movement by the attraction between the magnets by forming a dual magnets between the stator housing 310 and the stator 350 between the stator 350 It is installed in two places symmetrically.

As shown in FIG. 8, the dual magnet structure 315 couples the shaft S pole magnet 318 to the shaft 320 and couples the stator N pole magnet 312 to the corresponding stator housing 310 side. In addition, the shaft N pole magnet 316 is coupled to the permanent magnet 330 side, and the stator S pole magnet 314 is coupled to the stator housing 310 side corresponding thereto, the stator N pole magnet 312 and the stator S pole magnet The adhesive pad 311 is inserted between the 314 to prevent the stator N-pole magnet 312 and the stator S-pole magnet 314 from being in close contact, and the shaft S-pole magnet 318 and the shaft N-pole magnet 316. An adhesive pad 311 is inserted therebetween to prevent the shaft S pole magnet 318 and the shaft N pole magnet 316 from coming into close contact with each other.

The dual magnet structure 315 is an impeller 240 when the rotation of the rotor is low speed when the dynamic pressure is less generated in the thrust bearing (270) to not support the axial load (or unstable force) smoothly, The occurrence of the upper part in contact with the shroud surface is prevented by smoothly supporting the axial load by the attraction force of the dually configured magnet. In addition, when the rotation of the rotating body is a high speed, it is unstable due to the attraction of the dual magnet that the axial instability is caused by the minute difference of dynamic pressure generated by the two thrust bearings 270 or by the difference of aerodynamic force generated by the impeller 240. Remove the force to prevent it.

9 is a conceptual view of a cooling fin of a conventional turbo blower and FIG. 10 is a conceptual view of a cooling fin 340 for a guide vane of a small turbo blower according to the present invention. 340 is a top view, and FIG. 12 is a front view of the cooling vane 340 for the guide vane of the small turbo blower according to the present invention.

As shown in FIG. 9, the cooling fin of the conventional turbo blower passes through the cooling fin structure integrally formed with the motor before the flow of air passes through the impeller to absorb and cool the heat generated by the motor and flows in from the suction port. Air was induced to match the impeller suction direction due to the rotation of the impeller. However, two types of losses occur because the cooling fins are parallel to the inflow direction of the air, and the difference between the first rotating impeller blade angle and the flow angle passing through the cooling fins causes the cooling fins to fail. The loss is caused by the lack of swirling components of the flow, and secondly, the cooling effect of the motor is reduced due to the low heat transfer because the air flowing through the cooling fin is in contact with only a part of the cooling fin. There was a problem of being lowered.

The guide vane cooling fin 340 is installed in the outer surface of the stator housing 310, as shown in Figure 10 is divided into two toward the impeller 240 installed in both directions air sucked in the inlet 280 It is induced to move and absorbs the heat emitted from the motor to obtain a cooling effect.

The guide vane cooling fin 340 divides air into two parts and has an upper surface in an arc shape as shown in FIG. 11 to impart a swirling component, and the air pressure applied to each of the guide vane cooling fins 340. In order to disperse as a whole, air flow holes are formed in the front, and the copper alloy is made of relatively excellent thermal conductivity for faster cooling.

The guide vane cooling fin 340 has an upper surface in an arc shape, and the air flowing through the guide vane cooling fin 340 flows by imparting directionality (orbiting component) in a direction in which an impeller blade rotates. The relative speed between the blade and the blade can be reduced, thereby eliminating unnecessary losses, thereby improving the performance efficiency of the blower.

The operation of the small air blower apparatus according to the first embodiment of the present invention will be described in detail as follows.

When the small air blower is operated, the permanent magnet 330 starts to rotate with the stator 350 and the shaft 320 transmits the rotation to the impeller 240 to rotate the impeller 240.

When the impeller 240 starts to rotate and discharges the internal air to the outside, air is introduced through the inlet 280 from the outside to fill the spot, and the air introduced therein passes through the cooling vane 340 for the guide vane and the motor. Cool it and move it bifurcated towards the impeller installed in both directions.

The air moved to the suction end of the impeller 240 is sucked by the impeller 240 and subjected to the compression process, and then passes through the diffuser 260 which restores the velocity energy to the pressure energy and finally shroud & volute. It is discharged through the volute of the housing 220.

FIG. 13 is a cross-sectional view of a small turbo blower according to a second embodiment of the present invention, and FIG. 10 is a conceptual diagram of a cooling pipe used in the small blower according to the present invention.

The small air blower device according to the second embodiment of the present invention is an air blower device for high-speed rotation, and as shown in FIG. 13, the outside of the stator housing 310 of the small air blower device according to the first embodiment of the present invention. Between the cooling fan 340 for the guide vane is configured by adding a cooling pipe for rapid cooling.

The cooling pipe part includes a cooling pipe 345, a refrigerant supply pipe 346, a refrigerant pump 347, a refrigerant discharge pipe 348, and an external heat generator 349.

In the small air blower apparatus according to the second embodiment of the present invention, components except for the cooling pipe 345, the refrigerant supply pipe 346, the refrigerant pump 347, the refrigerant discharge pipe 348, and the external heater 349 are described. Since it is the same as the compact air blower according to the first embodiment of the present invention, the detailed description thereof will be omitted.

The cooling pipe 345 is a component for increasing the cooling efficiency than the cooling vane cooling fan 340 for air cooling. The cooling pipe 345 is formed between the outside of the stator housing 310 of the motor unit and the cooling vane cooling fan 340 for the guide vane. As shown in 14, the pipe is coupled in a coil shape and a refrigerant flows inside the pipe to perform a cooling function.

The refrigerant supply pipe 346 is connected to one end of the cooling pipe 345 and supplies a refrigerant for cooling into the pipe of the cooling pipe 345. The other end of the cooling pipe 345 is not connected to the other end of the cooling pipe 345. A refrigerant pump 347 for supplying a refrigerant is installed.

The refrigerant pump is a component that is separately installed on the outside of the small air blower device according to the second embodiment and is a component for supplying the refrigerant into the cooling pipe 345.

The refrigerant discharge pipe 348 is connected to one end of the cooling pipe 345 that is not connected to the refrigerant supply pipe 346 so that the cooling pipe 345 discharges the refrigerant introduced through the refrigerant supply pipe 346. Element.

The refrigerant discharge pipe 348 is a component that is connected to the external heat generator and moves the refrigerant discharged from the cooling pipe 345 to the external heat generator 349.

The external heat generator 349 is a component that absorbs the heat of the motor and cools the refrigerant whose temperature has risen, and is connected to the refrigerant pump 347 to supply the cooled refrigerant to the cooling pipe 345 again.

The operation of the small air blower apparatus according to the second embodiment of the present invention will be described in detail as follows.

When the small air blower is operated, the permanent magnet 330 starts to rotate with the stator 350 and the shaft 320 transmits the rotation to the impeller 240 to rotate the impeller 240. At the same time, an external refrigerant pump 347 operates to introduce refrigerant into the cold air pipe 345.

When the impeller 240 starts to rotate and discharges the internal air to the outside, air is introduced through the inlet 280 from the outside to fill the spot, and the air introduced therein passes through the cooling vane 340 for the guide vane and the motor. Cool it and move it bifurcated towards the impeller installed in both directions. In addition, the refrigerant introduced into the cold air pipe 345 through the refrigerant supply pipe 346 through the operation of the refrigerant pump 347 cools the motor and flows out through the refrigerant discharge pipe 348.

The air moved to the suction end of the impeller 240 is sucked by the impeller 240 and subjected to the compression process, and then passes through the diffuser 260 which restores the velocity energy to the pressure energy and finally shroud & volute. It is discharged through the volute of the housing 220. In addition, the coolant flowing out to the outside is cooled by dissipating heat from the external heat generator 349 and then introduced into the cold air pipe 345 through the coolant supply pipe 346 by the operation of the coolant pump 347.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. You will understand that. Accordingly, the embodiments described above are exemplary in all respects and are not limiting.

As described above, the small air blower apparatus according to the present invention combines the air foil bearing and the stator to achieve structural integration, thereby minimizing the structure and simplifying the air blower apparatus. There is an effect that can be utilized as part of the device.

In addition, the compact air blower according to the present invention has the effect of simplifying the production of the air blower device by combining the air foil bearing and the stator to achieve structural integration.

In addition, the small air blower according to the present invention can stably support the required load, and also has the effect of increasing the efficiency of the air blower by applying the structure of the guide vane to the air-cooled cooling fins.

In addition, the blower characterized by the operation of the high-speed rotation or more has the effect of improving the driving efficiency and the stability of the blower by increasing the cooling efficiency by mounting the cooling pipe of the coil type using the existing cooling fins and refrigerant.

Claims (8)

Thrust bearing housing, shroud & volute housing, main housing, which are configured symmetrically to form the outside of the air blower device, In the BLDC motor (Brushless DC Motor) motor section for generating a rotational force by the journal bearing is coupled to the inner surface of the stator for driving the rotor at high speed, Cooling fins for the guide vane of the arc-shaped to be installed on the outer surface of the motor portion to cool the introduced air and impart a turning component; An impeller blade is formed on the outside in a spiral shape and rotates according to the rotational force of the motor to allow air to flow into the blower; A shaft for transmitting the rotational force of the motor unit to the impeller unit; A thrust bearing for assisting rotation of the shaft; And a diffuser for increasing the pressure of the flow generated by the rotation of the impeller, Small air blower device characterized in that it comprises a suction port which is a passage through which the air is sucked in accordance with the rotation of the impeller. delete The method according to claim 1, And a seal cover for sealing between the shaft and the thrust bearing housing in a hole shape of the thrust bearing housing. The method according to claim 1, The permanent magnet is arranged in one end of the motor side of the shaft to form a double magnet structure capable of buffering the axial force due to the attractive force of the permanent magnet arranged in the stator housing, which is the outer case of the motor unit, in multiple directions. A compact air blower device. The method according to claim 4, A plurality of blades for the air flow is installed between the shaft and the dual magnet structure is a small, characterized in that coupled to the blade portion for generating a flow of air while rotating along the shaft to dissipate heat generated by the driving of the motor unit Air blower device. The method according to claim 1, Cooling pin for the guide vane is a small air blower, characterized in that a hole in the air flow is formed in the front portion. The method according to claim 1, Small air blower device characterized in that the cooling pipe portion using a refrigerant is installed between the guide vane cooling fin and the motor portion. The method of claim 7, wherein The cooling pipe part, Refrigerant pump coupled to the outside of the small air blower device for flowing the refrigerant, A refrigerant supply pipe which is a passage through which the refrigerant flowing by the refrigerant pump flows into the small air blower; A coil of cooling pipe coupled between the guide vane cooling fin and the outside of the motor unit and absorbing heat of the motor unit with a refrigerant flowing therein to perform a cooling function; A refrigerant discharge pipe through which the refrigerant absorbing heat from the motor unit is discharged from the cooling pipe; Small air blower device characterized in that it comprises an external heater for cooling the refrigerant discharged from the discharge pipe discharges the heat to the outside.

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