WO2021153945A1

WO2021153945A1 - Vehicle air conditioner

Info

Publication number: WO2021153945A1
Application number: PCT/KR2021/000843
Authority: WO
Inventors: 박창선; 이동원; 주영복
Original assignee: 한온시스템 주식회사
Priority date: 2020-01-30
Filing date: 2021-01-21
Publication date: 2021-08-05
Also published as: KR20210097466A

Abstract

The present invention relates to a vehicle air conditioner. The purpose of the present invention is to provide a vehicle air conditioner wherein foreign-material capture protrusions having at least three surfaces are formed on a hub part of a blower fan corresponding to a cooling-air discharge side of a blower motor such that, by capturing micro foreign materials inside cooling air from the blower motor, the efficiency of capturing micro foreign materials inside cooling air from the blower motor can be improved, and this can prevent the foreign materials inside cooling air from the blower motor from infiltrating into an air-conditioning case and into the car indoor environment. In order to accomplish the above-mentioned purpose, the present invention provides a vehicle air conditioner comprising a blower fan, a blower motor, and a motor cooling device for cooling the blower motor. The motor cooling device comprises: a cooling-air supply channel for supplying air discharged from the blower fan into the blower motor through a bypass route; and blower motor cooling-air discharge holes for discharging the air supplied into the blower motor. The blower fan comprises a center hub assembled to the motor shaft of the blower motor, and multiple blades installed at a predetermined interval along the circumference of the hub. The blower motor cooling-air discharge holes are formed on a blower motor part corresponding to the hub of the blower fan. A surface area increasing portion is formed on the hub part of the blower fan corresponding to the cooling-air discharge holes in order to increase the surface area of the hub.

Description

vehicle air conditioner

The present invention relates to an air conditioner for a vehicle, and more particularly, by forming foreign material trapping projections having at least three or more surfaces on a hub portion of a blower fan corresponding to the cooling air discharge side of the blower motor, the cooling air of the blower motor is formed. By capturing fine foreign substances in the inside, it is possible to improve the capture efficiency of fine foreign substances in the cooling air of the blower motor, and through this, it is possible to prevent the inflow of fine foreign substances in the cooling air of the blower motor into the air conditioning case and the inside of the vehicle. It's about the device.

Cars are equipped with an air conditioning system that cools and heats the interior of the vehicle. As shown in FIGS. 1 and 2 , the air conditioner includes a blower 10 that sucks the internal and external air and blows the air into the vehicle interior.

The blower 10 includes a scroll casing 12 , a blower fan 20 installed in the ventilation chamber 14 of the scroll casing 12 , and a blower motor 30 for driving the blower fan 20 . .

The blower fan 20 is a multi-vane fan, and includes a central cone-type hub 22 and a plurality of blades 24 installed around the hub 22 . .

In particular, the hub 22 is fixed to the shaft 36a of the blower motor 30, and the blades 24 rotate together with the hub 22 to suck in air on the inlet 12a side of the scroll casing 12 and , blows the sucked air toward the outlet 12b of the scroll casing 12 .

The blower motor 30 is rotatably installed inside the motor housing 32 and the stators 34 installed at regular intervals along the circumferential direction on the inner peripheral surface of the motor housing 32 and the stators 34 . The rotor 36 to be used, the commutators 37 installed at regular intervals on the outer surface of the motor shaft 36a of the rotor 36, and the brush 38 for intermittently applying electricity to each commutator 37 include those

The motor housing 32 is constituted by a combination of a front housing 32a and a rear housing 32b, and the motor housing 32 thus formed is connected to the scroll casing 12 through the peripheral motor cover 32c. fixedly installed.

In this blower motor 30, when electricity is applied to the commutator 37 through the brush 38, the coils of the rotor 36 are excited and demagnetized by the applied electricity, and the external stators 34 and the attractive force and Repulsive force is generated, and rotational torque is generated by the attractive force and repulsive force with these stators 34, and the rotor 36 is rotated, and the motor shaft 36a of the rotor 36 is rotated by the rotation of the rotor 36. The blower fan 20 installed in the rotational movement.

Meanwhile, the blower 10 further includes a motor cooling device 40 for cooling the blower motor 30 .

The motor cooling device 40 includes a cooling air supply passage 42 that bypasses the air on the side of the scroll casing 12 discharged from the blower fan 20 and supplies it to the inside of the blower motor 30, and the blower motor ( 30) includes a plurality of cooling air discharge holes 44 for discharging the air supplied to the inside.

The motor cooling device 40 bypasses a portion of the discharge air of the blower fan 20 and supplies it to the inside of the blower motor 30 , so the air supplied to the inside of the blower motor 30 is supplied to the blower motor 30 . ) Allows cooling of internal friction contact parts. Accordingly, overheating of the blower motor 30 is prevented.

Meanwhile, the air cooled inside the blower motor 30 is discharged to the outside through the cooling air discharge holes 44 . In particular, it is configured to be discharged to the blowing chamber 14 side of the scroll casing 12 .

Typically, the cooling air supply passage 42 is connected to the rear housing 32b side of the motor housing 32 , and the cooling air discharge holes 44 are on the front housing 32a side of the motor housing 32 . It is configured to be formed in a part.

In particular, the cooling air discharge holes 44 are configured to be formed in a portion corresponding to the bottom surface 22a of the hub 22 of the blower fan 20 among the front housing 32a side portions of the motor housing 32 .

However, in such a conventional air conditioner, in the cooling process of the blower motor 30 through the cooling air of the motor cooling device 40, various fine foreign substances generated inside the blower motor 30 are contained in the cooling air, There is a disadvantage in that various fine foreign substances included in this way are introduced into the scroll casing 12 through the cooling air discharge hole 44 .

In particular, a large amount of copper powder is generated at various friction contact parts inside the blower motor 30 , for example, friction contact parts between the commutator 37 and the brush 38 . While being included in the cooling air supplied to the inside, there is a disadvantage in that the cooling air is introduced into the scroll casing 12 through the cooling air discharge hole 44 .

And, due to these disadvantages, various parts, for example, an evaporator (not shown) and a heater core (not shown), in which copper powder introduced into the scroll casing 12 is installed on the air flow path of the air conditioning case (not shown). ), etc., is attached to the heat exchanger, corroding the heat exchanger, and, at the same time, has a problem of contaminating the air in the vehicle interior while being blown into the vehicle interior.

In particular, when copper powder adheres to the heat exchanger, the corrosion of the heat exchanger is increased.

On the other hand, in consideration of this, a number of techniques for removing and processing various fine foreign substances contained in the cooling air of the blower motor 30 have been proposed. As an example, there is a “centrifugal multi-blade blower” of Japanese Patent Application No. 2014-51818.

This technology has a structure in which annular irregularities are formed on the main plate of the impeller corresponding to the cooling air discharge hole of the electric motor.

This conventional technique is configured to capture fine foreign substances in the cooling air discharged from the cooling air discharge hole of the electric motor by the concavo-convex part.

Accordingly, the fine foreign matter in the cooling air of the electric motor is removed and, through this, the inflow of the fine foreign matter generated from the electric motor into the scroll casing 12 and the inside of the vehicle is blocked.

However, this conventional technique has a disadvantage in that the capture efficiency of fine foreign substances contained in the cooling air of the electric motor is low.

In particular, the annular concave-convex portion formed on the main plate of the impeller has two surface portions, but there is a problem in that fine foreign substances contained in the cooling air of the electric motor cannot be effectively captured with these two surface portions.

And because of this problem, it is pointed out that the fine foreign matter contained in the cooling air of the electric motor still flows into the scroll casing and the vehicle interior.

The present invention has been devised to solve the problems of the prior art, and its purpose is to remarkably improve the capture efficiency of various fine foreign substances contained in the cooling air of the blower motor by improving the structure. is to provide

Another object of the present invention is to improve the capture efficiency of various fine foreign substances contained in the cooling air of the blower motor, thereby preventing various fine foreign substances in the blower motor from flowing into the scroll casing through the cooling air. An object of the present invention is to provide an air conditioning system for a vehicle.

Another object of the present invention is to prevent various fine foreign substances in the blower motor from flowing into the scroll casing, thereby corroding various air conditioning parts and contamination of air in the vehicle interior due to inflow of fine foreign substances into the scroll casing. To provide an air conditioning system for a vehicle that can prevent

In order to achieve this object, an air conditioner for a vehicle according to the present invention includes a blower fan, a blower motor, and a motor cooling device for cooling the blower motor, the motor cooling device comprising: A vehicle air conditioner comprising a cooling air supply passage for supplying the inside of the blower motor by bypassing the discharge air of the blower fan, and cooling air discharge holes of the blower motor for discharging the air supplied to the inside of the blower motor. In the following, the blower fan comprises a central hub assembled to the motor shaft of the blower motor, and a plurality of blades installed at regular intervals along the circumference of the hub, and the cooling air discharge hole of the blower motor is , It is formed in the blower motor portion corresponding to the hub of the blower fan, the hub portion of the blower fan corresponding to the cooling air discharge hole, characterized in that the surface area increasing portion for increasing the surface area of the hub is formed. .

Preferably, the cooling air discharged from the cooling air discharge hole is discharged along a cooling air discharge passage between the hub of the blower fan and the blower motor; The surface area increasing portion is formed to protrude to have at least three or more surfaces on a portion corresponding to the cooling air discharge passage among the hub portions of the blower fan, and fine foreign substances in the cooling air discharged from the cooling air discharge hole. It is characterized in that it comprises a plurality of foreign material trapping projections to capture the.

And the foreign material trapping projections, characterized in that the blower fan is formed to protrude to have four surfaces (face).

And the foreign material trapping projections, doedoe protruding to have four surfaces on the hub of the blower fan, are configured to correspond to each other facing each other, any one pair of the two facing each other pair of surfaces, the end The parts are in contact with each other to form a tip, and the other pair is configured to correspond to both sides based on the tip, and is characterized in that it protrudes in a triangular shape of a certain thickness as a whole.

And the foreign material trapping projections, doedoe projecting to have four surfaces, characterized in that the area of each surface is formed to have a size smaller than the area of the base side of the hub (基底面).

And the foreign material trapping protrusions, doedoe protruding to have four surfaces, the tip edge of the two surfaces is characterized in that it is formed in a direction perpendicular to the flow direction of the cooling air.

According to the vehicle air conditioner according to the present invention, since foreign matter trapping protrusions having at least three or more surfaces are formed on the bottom of the hub of the blower fan, the surface area of the bottom of the hub of the blower fan can be significantly increased.

In addition, since the structure can significantly increase the surface area of the bottom of the hub of the blower fan, it is possible to more effectively trap fine foreign substances in the cooling air of the blower motor discharged to the bottom of the hub of the blower fan.

In addition, since it is possible to improve the capture efficiency of fine foreign substances in the cooling air of the blower motor discharged to the underside of the hub of the blower fan, it is possible to significantly improve the inflow of fine foreign substances in the cooling air of the blower motor into the scroll casing. .

In addition, since it is possible to significantly improve the inflow of fine foreign substances in the cooling air of the blower motor into the scroll casing, the corrosion of various air conditioning parts caused by the inflow of fine copper powder into the scroll casing and air pollution in the vehicle interior can be significantly improved. can have an effect.

1 is a view showing a conventional vehicle air conditioner;

2 is an enlarged view showing a blower constituting a conventional vehicle air conditioner;

3 is a view showing the configuration of an air conditioner for a vehicle according to the present invention;

4 is a bottom perspective view of a blower fan showing an increased surface area of the blower fan constituting the vehicle air conditioner of the present invention;

5 is a bottom view of a blower fan showing an increase in the surface area of the blower fan constituting the air conditioner for a vehicle according to the present invention;

6 is a side cross-sectional view illustrating another embodiment of a surface area increasing part of a blower fan constituting an air conditioner for a vehicle according to the present invention.

Hereinafter, a preferred embodiment of the air conditioner for a vehicle according to the present invention will be described in detail based on the accompanying drawings (the same components as in the prior art will be described using the same reference numerals).

First, before examining the features of the vehicle air conditioner according to the present invention, the blower 10 of the vehicle air conditioner will be briefly described with reference to FIGS. 3 and 4 .

The blower fan 20 is a fan, and includes a central cone-shaped hub 22 and a plurality of blades 24 installed around the hub 22 .

The blower motor 30 includes a motor housing 32 , stators 34 installed at regular intervals on the inner circumferential surface of the motor housing 32 , and a rotor 36 rotatably installed inside the stators 34 . ) and commutators 37 installed at regular intervals on the outer surface of the motor shaft 36a of the rotor 36 and brushes 38 for intermittently applying electricity to each commutator 37 .

The motor cooling device 40 bypasses a portion of the discharge air of the blower fan 20 and supplies it to the inside of the blower motor 30 . Accordingly, the air supplied to the inside of the blower motor 30 cools the various frictional contacts inside the blower motor 30 .

Here, the air cooled inside the blower motor 30 is discharged to the blowing chamber 14 side of the scroll casing 12 through the cooling air discharge holes 44 .

In particular, the cooling air discharge holes 44 are configured to be formed along the circumferential direction in the front housing 32a side portion around the motor shaft 36a.

In addition, the cooling air discharge holes 44 are configured to be formed in a portion corresponding to the bottom surface 22a of the hub 22 of the blower fan 20 among the front housing 32a side portions of the motor housing 32 .

Therefore, after the air cooled inside the blower motor 30 is discharged from the cooling air discharge hole 44, the blower motor 30 and It is configured to be discharged to the blowing chamber 14 side of the scroll casing 12 along the flow path 26 between the hubs 22 of the blower fan 20 (hereinafter, referred to as “cooling air discharge flow path 26”).

Next, the features of the vehicle air conditioner according to the present invention will be described in detail with reference to FIGS. 3 to 5 .

First, referring to FIGS. 3 to 5 , the air conditioner of the present invention includes a surface area increasing part 50 for increasing the surface area of the hub 22 of the blower fan 20 on the blower motor 30 side. .

The surface area increasing unit 50 is configured to increase the surface area of a portion corresponding to the cooling air discharge hole 44 of the blower motor 30 among the hub 22 of the blower fan 20 on the side of the blower motor 30 . is composed

In particular, the surface area increasing part 50 is a cooling air discharge flow path between the blower motor 30 and the blower fan 20 hub 22 among the hub 22 parts of the blower fan 20 on the side of the blower motor 30 . It is configured to increase the surface area of the hub 22 portion of the blower fan 20 corresponding to (26).

The surface area increasing part 50 is a plurality of foreign substances formed on the bottom surface 22a of the hub 22 among the hub 22 portions of the blower fan 20 corresponding to the blower motor cooling air discharge passage 26 . Includes capture projections (52).

The foreign material trapping protrusions 52 are formed to protrude from the bottom surface 22a of the hub 22 of the blower fan 20 to have at least three or

more surfaces

52a, 52b, 52c, and 52d.

These foreign matter trapping protrusions 52, after being discharged from the cooling air discharge hole 44 of the blower motor 30, the cooling air discharge passage 26 between the blower motor 30 and the blower fan 20 and the hub 22 ) to trap fine foreign substances in the cooling air flowing along the

In particular, it captures various fine foreign substances generated in the internal friction contact portion of the blower motor 30 and contained in the cooling air, for example, a large amount of copper powder generated in the friction contact portion between the commutator 37 and the brush 38 .

Therefore, the copper powder generated between the commutator 37 and the brush 38 flows along the cooling air and directly flows into the scroll casing 12 through the cooling air discharge hole 44 of the motor housing 32 . block

Accordingly, it is possible to prevent corrosion of various air conditioning components and air pollution in the vehicle interior due to inflow of fine copper powder into the scroll casing 12 . In particular, it is possible to prevent corrosion of the heat exchanger due to the inflow of fine copper powder and deterioration of the durability of the heat exchanger.

In addition, since the foreign material trapping protrusions 52 protrude with at least three or

more surfaces

52a, 52b, 52c, 52d on the bottom surface 22a of the hub 22 of the blower fan 20, the cooling air discharge flow path 26 ), the surface area of the hub 22 of the blower fan 20 on the side is significantly increased.

Therefore, after being discharged from the cooling air discharge hole 44 of the blower motor 30, the efficiency of capturing fine foreign substances in the cooling air flowing along the cooling air discharge passage 26 is remarkably improved.

In this way, it is possible to remarkably improve the inflow of fine foreign substances in the cooling air of the blower motor 30 into the scroll casing 12 , and through this, the inflow of fine copper powder into the inside of the scroll casing 12 can prevent the inflow of various air conditioning parts. Corrosion and indoor air pollution can be significantly improved.

On the other hand, these foreign material trapping protrusions 52 are, as shown in FIGS. 3 to 5, four

surfaces

52a, 52b, 52c, on the bottom surface 22a of the hub 22 of the

blower fan

20, 52d) is preferred.

More preferably, the foreign material trapping projections 52 are protruded to have four

surfaces

52a, 52b, 52c, and 52d on the bottom surface 22a of the hub 22 of the blower fan 20, and two surfaces ( 52a, 52b) (52c, 52d) is configured to face each other and correspond to each other, and any one pair (52a, 52b) of the two opposing face (52a, 52b) (52c, 52d) pairs is the end The parts are in contact with each other to form a tip part 52e, and the

other pairs

52c and 52d are configured to correspond to both sides with respect to the tip part 52e as a reference, and a triangular shape of a certain thickness as a whole. ) to protrude in the shape of

In addition, the triangular-shaped foreign material trapping protrusions 52 have four

surfaces

52a, 52b, 52c, and 52d, and each area of each of the

surfaces

52a, 52b, 52c, 52d is, the foreign material trapping projection 52 It is configured to have a size smaller than the area of the base surface 52f of the hub 22 side.

The reason for this configuration is that, when the area of each of the

surfaces

52a, 52b, 52c, and 52d of the foreign material trapping protrusion 52 is larger than the area of the base surface 52f, the size of the foreign material trapping projection 52 is excessively large, so that the air This is because there is a risk of resistance.

In addition, the foreign material trapping projections 52 are formed to protrude from the bottom surface 22a of the hub 22 of the blower fan 20 so as to have four

surfaces

52a, 52b, 52c, and 52d, two surfaces 52a, It is preferable that the tip portion 52e of 52b) is formed in a direction opposite to the flow direction of the cooling air. In particular, it is preferable that the edges of the tip portions 52e of the two

surfaces

52a and 52b are formed in a direction perpendicular to the flow direction of the cooling air.

In this case, the tip portions 52e of the two

surfaces

52a and 52b must be formed in a direction perpendicular to the flow direction of the cooling air, so that various fine foreign substances contained in the cooling air are more Because it can be captured efficiently.

In addition, the foreign material trapping projections 52, having four surfaces (52a, 52b, 52c, 52d), the two surfaces (52a, 52b) constituting the tip portion (52e) are preferably formed to be perpendicular to each other. do. This is to more efficiently capture various fine foreign substances contained in the cooling air.

In addition, the foreign material trapping protrusions 52 are formed on the bottom surface 22a of the hub 22 of the blower fan 20, and the shaft hole of the hub 22 into which the motor shaft 36a of the blower motor 30 is fitted. It is formed to protrude in the form of a point at regular intervals on a concentric circle centered on (22b).

In particular, it is formed in the form of protruding points at regular intervals on a concentric circle centered on the shaft hole 22b of the hub 22, and a plurality of concentric circles centered on the shaft hole 22b of the hub 22 It is protruded in the shape of a dot on the top.

Accordingly, the foreign material trapping protrusions 52 are arranged in multiple layers with the shaft hole 22b of the hub 22 in the center in the radial direction outward.

In addition, the foreign material trapping projections 52 are arranged in multiple layers outward in the radial direction with the shaft hole 22b of the hub 22 as the center, and the foreign material trapping projections 52 between the multiple arrays are formed to be staggered with respect to each other. configured to be

Accordingly, the foreign material trapping protrusions 52 have a structure in which the shaft hole 22b of the hub 22 is centered and arranged in a zigzag form toward the outside in the radial direction.

The reason for this configuration is so that the space on the side of the hub 22 of the blower fan 20 formed between the foreign matter trapping protrusions 52 can maintain a zigzag shape, which is to reduce the air flow path of the cooling air as much as possible. This is in order to efficiently capture various microscopic foreign substances contained in the cooling air by complicating it.

On the other hand, these foreign material trapping projections 52 are formed to protrude from the bottom surface 22a of the hub 22 of the blower fan 20, and among the bottom surface 22a of the hub 22, a specific section portion (A) It is preferable not to form in

In particular, among the bottom surface 22a of the hub 22, the cooling air discharge passage 26 between the hub 22 of the blower fan 20 and the blower motor 30 is formed in a portion corresponding to the narrowest width. It is preferable not to

This is because, when the foreign material trapping protrusions 52 are formed in the narrowest cooling air discharge passage 26, there is a fear that the cooling air discharge passage 26 is narrower and the discharge of the cooling air is obstructed.

Next, FIG. 6 is a diagram showing another embodiment of the surface area increasing part 50 .

The surface area increasing part 50 of another embodiment includes a plurality of foreign material trapping projections 52 formed on the bottom surface 22a of the hub 22 of the blower fan 20, wherein the foreign material trapping projections 52 are 5 It has a protruding structure to have four

surfaces

52a, 52b, 52c, 52d, and 52e.

To explain this in more detail, the foreign material trapping projections 52 are protruded to have five

surfaces

52a, 52b, 52c, 52d, and 52e on the bottom surface 22a of the hub 22 of the blower fan 20. As a whole, it is constructed to protrude in the shape of a quadrangle.

Preferably, the foreign material trapping projections 52 are protruded to have five

surfaces

52a, 52b, 52c, 52d, and 52e on the bottom surface 22a of the hub 22 of the blower fan 20, four surfaces. (52a, 52b) (52c, 52d) are paired with each other two by one and correspond to each other horizontally, and the other surface 52e is at right angles to the four

surfaces

52a, 52b (52c, 52d). It is configured to connect the ends to each other while forming, and is configured to protrude in a rectangular shape of a certain thickness as a whole.

Here, among the five

surfaces

52a, 52b, 52c, 52d, and 52e of the foreign material trapping protrusions 52, the other surface connecting the ends of the four

surfaces

52a, 52b, 52c, 52d The silver is preferably formed in parallel with the bottom surface 22a of the hub 22 of the blower fan 20 .

The rectangular foreign matter trapping protrusions 52 having such a structure maximize the surface area of the hub 22 of the blower fan 20 on the cooling air discharge passage 26 side.

Accordingly, after being discharged from the cooling air discharge hole 44 of the blower motor 30 , the efficiency of capturing fine foreign substances in the cooling air flowing along the cooling air discharge passage 26 is maximized.

According to the present invention having such a configuration, a structure in which foreign material trapping projections 52 having at least three or

more surfaces

52a, 52b, 52c, 52d are formed on the bottom surface 22a of the hub 22 of the blower fan 20 Therefore, the surface area of the bottom surface 22a of the hub 22 of the blower fan 20 can be significantly increased.

In addition, since it is a structure that can significantly increase the surface area of the bottom surface 22a of the hub 22 of the blower fan 20, the blower motor 30 is discharged toward the bottom surface 22a of the hub 22 of the blower fan 20. It is possible to more effectively trap fine foreign substances in the cooling air of

In addition, since it is possible to improve the capture efficiency of fine foreign substances in the cooling air of the blower motor 30 discharged toward the bottom surface 22a of the hub 22 of the blower fan 20, the fine foreign substances in the cooling air of the blower motor 30 can be improved. of the scroll casing 12 can be remarkably improved.

In addition, since it is possible to significantly improve the inflow of fine foreign substances in the cooling air of the blower motor 30 into the scroll casing 12 , the corrosion and difference of various air conditioning parts due to the inflow of fine copper powder into the inside of the scroll casing 12 . It can significantly improve indoor air pollution.

In the above, preferred embodiments of the present invention have been exemplarily described, but the scope of the present invention is not limited to such specific embodiments, and can be appropriately changed within the scope described in the claims.

Claims

A blower fan, a blower motor, and a motor cooling device for cooling the blower motor, wherein the motor cooling device bypasses the discharge air of the blower fan to the inside of the blower motor A vehicle air conditioner comprising: a cooling air supply passage for supplying a cooling air; and cooling air discharge holes of the blower motor for discharging the air supplied to the inside of the blower motor,

The blower fan includes a central hub assembled to the motor shaft of the blower motor, and a plurality of blades installed at regular intervals along the circumference of the hub,

The cooling air discharge hole of the blower motor is formed in a portion of the blower motor corresponding to the hub of the blower fan,

The air conditioner for a vehicle, characterized in that a surface area increasing portion for increasing the surface area of the hub is formed in a hub portion of the blower fan corresponding to the cooling air discharge hole.
The method of claim 1,

The cooling air discharged from the cooling air discharge hole is discharged along a cooling air discharge passage between the hub of the blower fan and the blower motor;

The surface area increase part,

Among the hub portions of the blower fan, a plurality of protrusions are formed to have at least three or more surfaces in a portion corresponding to the cooling air discharge passage, and to capture fine foreign substances in the cooling air discharged from the cooling air discharge hole. An air conditioner for a vehicle, characterized in that it includes foreign matter trapping projections.
3. The method of claim 2,

The foreign material trapping projections,

An air conditioner for a vehicle, characterized in that the blower fan is formed to protrude to have four surfaces on the hub of the blower fan.
4. The method of claim 3,

The foreign material trapping projections,

It protrudes to the hub of the blower fan so as to have four sides, and is configured to face each other and correspond to each other,

Of the two pairs of faces facing each other, any one pair has its ends in contact with each other to form a tip, and the other pair is configured to correspond to both sides based on the tip, as a whole An air conditioner for a vehicle, characterized in that it protrudes in a triangular shape of a certain thickness.
5. The method of claim 4,

The foreign material trapping projections,

The air conditioner for a vehicle, characterized in that it protrudes so as to have four surfaces, and the area of each surface is formed to have a size smaller than that of the base surface of the hub side.
6. The method of claim 5,

The foreign material trapping projections,

An air conditioner for a vehicle, characterized in that it protrudes so as to have four surfaces, and wherein the tip edge of the two surfaces is formed in a direction perpendicular to the flow direction of the cooling air.
7. The method of claim 6,

The foreign material trapping projections,

The air conditioner for a vehicle, characterized in that it has four surfaces, and the two surfaces forming the tip are formed at right angles to each other.
3. The method of claim 2,

The foreign material trapping projections,

An air conditioner for a vehicle, characterized in that the blower fan is formed to protrude from the hub of the blower fan to have five surfaces.
9. The method of claim 8,

The foreign material trapping projections,

It protrudes from the hub of the blower fan to have five surfaces, of which four surfaces are paired with each other and correspond to each other horizontally, and the other surface is connected to each other while forming a right angle to the four surfaces. The air conditioner for a vehicle, characterized in that it is configured to protrude in a rectangular shape of a predetermined thickness as a whole.
10. The method of claim 9,

Among the five surfaces of the foreign material trapping protrusions, the other surface connecting the ends while forming a right angle to the four surfaces is formed in parallel with the hub portion of the blower fan.
11. The method according to any one of claims 2 to 10,

The foreign material trapping projections,

The air conditioner for a vehicle, characterized in that it is formed on the hub of the blower fan, and is formed to protrude at regular intervals on a concentric circle centered on the shaft hole of the hub into which the motor shaft of the blower motor is fitted.
12. The method of claim 11,

The foreign material trapping projections,

The air conditioner for a vehicle, characterized in that it is formed to protrude on a plurality of concentric circles centered on the shaft hole of the hub, and is arranged in multiple layers outward in the radial direction with the shaft hole of the hub at the center.
13. The method of claim 12,

The foreign material trapping projections,

With the shaft hole of the hub at the center, multiple layers are arranged in multiple radially outwards, and the foreign material trapping projections between the multiple arrays are alternately formed with respect to each other,

The air conditioner for a vehicle, characterized in that it is arranged in a zigzag (Zigzag) form toward the outside in the radial direction with the shaft hole of the hub at the center.
14. The method of claim 13,

The foreign material trapping projections,

The air conditioner for a vehicle, characterized in that the blower fan is formed to protrude from the hub, but is not formed in a specific section of the hub portion.
15. The method of claim 14,

The foreign material trapping projections,

The air conditioner for a vehicle, characterized in that it is not formed in a portion corresponding to the narrowest width of the cooling air discharge passage between the hub and the blower motor among the hub portions.