Impeller apparatus and vehicle blower system having the same

Abstract

The impeller device according to the disclosed invention comprises a hollow impeller case having an air intake port and an air outlet port, an impeller installed inside the impeller case including an inlet port communicating with the intake port to generate suction force for air, and an inlet ring provided at the intake port of the impeller case to guide the flow of air sucked into the intake port to the inlet port of the impeller, wherein the impeller band and the inlet ring provided along the circumference of the inlet port of the impeller each include mutually facing semi-circular curved surfaces. With this configuration, the suction cross-sectional area of ​​the air guided and sucked through the inlet ring can be increased, thereby improving the air intake airflow performance.

Description

Technology Field

[0001] The present invention relates to an impeller device for a vehicle and a blower system for a vehicle including the same, and more specifically, to an impeller device for a vehicle and a blower system for a vehicle including the same that can improve the efficiency of the intake air volume of air sucked into the interior of the vehicle. Background Technology

[0002] Generally, air conditioning systems are devices designed to maintain a comfortable indoor environment by controlling the temperature, humidity, and circulation of indoor air. They are primarily applied inside buildings or vehicles to regulate temperature and improve indoor air quality. Such systems are installed in vehicles to maintain the interior at an appropriate temperature or to ensure clear visibility while driving by compensating for temperature and humidity differences between the inside and outside of the vehicle.

[0003] Vehicle air conditioning systems regulate the temperature inside the vehicle by using indoor and outdoor air to cool or heat the air through heat exchange and supplying it to the vehicle's interior. Such vehicle air conditioning systems are equipped with a blower to draw in air from the vehicle's interior or exterior, and the blower includes an impeller to generate air intake force. Meanwhile, in recent years, there has been a continuous demand for various studies to improve the efficiency of air intake volume while the vehicle is in motion. The problem to be solved

[0004] The objective of the present invention is to provide an impeller device capable of improving the efficiency of the intake air volume of air drawn into the interior of a vehicle with a simple structure.

[0005] Another objective of the present invention is to provide a vehicle blower system comprising an impeller device having the above objective achieved. means of solving the problem

[0006] An impeller device according to the present invention for achieving the above objective comprises: a hollow impeller case having an air intake port and an air outlet port; an impeller installed inside the impeller case including an inlet port communicating with the intake port and generating a suction force for the air; and an inlet ring provided at the intake port of the impeller case and guiding the flow of the air sucked into the intake port to the inlet port of the impeller, wherein an impeller band provided along the circumference of the inlet port of the impeller and the inlet ring each include mutually facing semi-circular curved surfaces.

[0007] Additionally, the impeller band may be provided in a 'J' shape, comprising a first curved section in which a cross-section cut in the diameter direction of the impeller extends in a semi-circular shape toward the center of the impeller, and a horizontal section extending in the diameter direction from the first curved section toward the center of the impeller.

[0008] Additionally, the inlet ring may include an extension end extending in the diameter direction of the impeller from the suction port of the impeller case, and a second curved end extending curvaturely from the extension end in a semi-circular shape with a cross-section cut in the diameter direction of the impeller toward the center of the impeller, facing the impeller band.

[0009] Additionally, the inlet ring may include a backflow prevention projection that extends toward the interior of the impeller case at a position spaced apart from the second curved end and blocks the backflow of the air sucked in from the intake port.

[0010] In addition, the second curvature section may be formed convexly in the direction opposite to the direction toward the impeller band.

[0011] In addition, the impeller band may be provided between the second curved end of the inlet ring and the backflow prevention projection.

[0012] Additionally, the impeller band may include a first curved section in which a cross-section cut in the diameter direction of the impeller extends in a semi-circular shape toward the center of the impeller, and a horizontal section extending in the diameter direction from the first curved section toward the center of the impeller, and the inlet ring may include an extension section extending in the diameter direction of the impeller from the suction port of the impeller case, a second curved section extending in a semi-circular shape in which a cross-section cut in the diameter direction of the impeller extends in a curved shape toward the center of the impeller from the extension section and facing the impeller band, and a backflow prevention projection extending toward the interior of the impeller case at a position spaced apart from the second curved section.

[0013] In addition, the first curvature end may be formed convexly in the direction opposite to the direction toward the second curvature end.

[0014] Additionally, the impeller band may be provided between the second curved end of the inlet ring and the backflow prevention projection, wherein the horizontal end and the second curved end are spaced apart by a first interval, and the backflow prevention projection may be provided to protrude by a second interval relative to the horizontal end.

[0015] In addition, the horizontal end of the impeller band may be positioned at a first interval with respect to the inner surface of the second curved end so as not to extend toward the interior of the impeller beyond the second curved end of the inlet ring.

[0016] In addition, the backflow prevention projection of the inlet ring may be provided to protrude toward the interior of the impeller case by a second distance from the horizontal end.

[0017] A vehicle blower system for achieving the objective of the present invention comprises the aforementioned impeller device that generates a suction force for air, and an intake device that opens and closes the flow of air sucked in by the suction force generated from the impeller device.

[0018] In addition, the intake device is provided with an outside air inlet and an inside air inlet, into which outside air entering from the outside of the vehicle and inside air entering from the inside of the vehicle, respectively, and the outside air inlet and the inside air inlet can be opened and closed by a first and a second door, respectively.

[0019] A blower system for a vehicle according to another aspect for achieving the objective of the present invention comprises an impeller device that generates a suction force for air and an intake device that opens and closes the flow of air sucked in by the suction force generated from the impeller device, wherein the impeller device comprises an impeller that rotates to generate a suction force for air and has an impeller band provided in a circumferential direction at an inlet into which the air is introduced, an impeller case that surrounds and protects the impeller inside, and an inlet ring that guides the flow of air into the impeller, wherein the impeller band is provided at a position that does not extend beyond the inlet ring and the impeller band and the inlet ring each include mutually facing semi-circular curved surfaces.

[0020] Additionally, the impeller band may include a first curved section in which a cross-section cut in the diameter direction of the impeller extends in a curved semi-circular shape toward the center of the impeller, and a horizontal section extending in the diameter direction from the first curved section toward the center of the impeller, and the inlet ring may include an extension section extending in the diameter direction of the impeller from the intake port of the impeller case, a second curved section extending in a curved semi-circular shape from the extension section in which a cross-section cut in the diameter direction of the impeller extends toward the center of the impeller and faces the impeller band, and a backflow prevention projection extending toward the interior of the impeller case at a position spaced apart from the second curved section to block the backflow of the air sucked in from the intake port.

[0021] In addition, the impeller band may be provided between the second curved end of the inlet ring and the backflow prevention projection.

[0022] Additionally, the impeller band may be provided between the second curved end of the inlet ring and the backflow prevention projection, wherein the horizontal end and the second curved end are spaced apart by a first interval, and the backflow prevention projection may be provided to protrude toward the interior of the impeller case by a second interval relative to the horizontal end.

[0023] In addition, the intake device is provided with an outside air inlet and an inside air inlet, into which outside air entering from the outside of the vehicle and inside air entering from the inside of the vehicle, respectively, and the outside air inlet and the inside air inlet can be opened and closed by a first and a second door, respectively. Effects of the invention

[0024] According to the present invention having the above-described configuration, the impeller band and the inlet ring are provided to have mutually facing semi-circular curved surfaces, thereby expanding the air intake cross-sectional area of ​​the inlet ring that induces air inflow into the impeller. As a result, the suction efficiency of the impeller can be improved, which can contribute to improving blower performance.

[0025] In addition, by ensuring that the impeller band does not extend beyond the inlet ring, the flow of air flowing backward without entering the impeller's inlet can be effectively blocked. Brief explanation of the drawing

[0026] FIG. 1 is a front view schematically illustrating a vehicle blower system according to a preferred embodiment of the present invention. FIG. 2 is a schematic cross-sectional view taken by cutting along the line II-II shown in FIG. 1. FIG. 3 is a schematically enlarged cross-sectional perspective view of the impeller device of the vehicle blower system illustrated in FIG. 1. FIG. 4 is a schematic cross-sectional view of the impeller device illustrated in FIG. 3. FIG. 5 is an enlarged view schematically illustrating area B of FIG. 4. And, FIG. 6 is a graph schematically illustrating the intake airflow efficiency of the vehicle blower system according to the present invention shown in FIG. 1, compared with the conventional one. Specific details for implementing the invention

[0027] Hereinafter, a preferred embodiment of the present invention will be described with reference to the accompanying drawings. However, the concept of the present invention is not limited to such an embodiment, and the concept of the present invention may be proposed differently by adding, changing, or deleting components constituting the embodiment, and such are also included within the concept of the invention.

[0029] Referring to FIGS. 1 and FIGS. 2, a vehicle blower system (1) according to a preferred embodiment of the present invention includes an impeller device (10) and an intake device (50).

[0031] The impeller device (10) generates a suction force for air (A) and provides a suction force for outside air or inside air introduced through the intake device (50) described later. As shown in FIGS. 2 and 3, this impeller device (10) includes an impeller case (20), an impeller (30), and an inlet ring (40).

[0032] The impeller case (20) is provided with an air intake port (21) and an exhaust port (22), and is hollow so that a path for air (A) is provided inside. Additionally, based on the illustration in FIGS. 1 and 2, the impeller case (20) is provided with an intake port (21) at the top that communicates with the intake device (50) to be described later, and an exhaust port (22) is provided along the side of the impeller case (20). The shape of the impeller case (20) and the size of the intake port (21) and exhaust port (22) are not limited to the illustrated example, and it is obvious that various modifications are possible.

[0033] For reference, the outlet (22) provided in the impeller case (20) is not shown in detail, but can be connected to an air conditioner (not shown) that controls the temperature of the air using cooling water.

[0034] The impeller (30) is installed inside the impeller case (20) and has a plurality of blades (32) arranged in a circumferential direction to generate a suction force that sucks in air (A) by rotational force. This impeller (30) includes an inlet (31), blades (32), an impeller band (33), and a driving source (34).

[0035] As shown in FIGS. 3 and 4, the inlet (31) of the impeller (30) is formed through the upper part of the impeller (30) to communicate with the suction port (21) of the impeller case (20). On the lower part of the impeller (30) facing this inlet (31), a bottom surface (35) is provided facing inward for the installation of a driving source (34) to be described later.

[0036] A plurality of blades (32) are provided at a predetermined angle in the circumferential direction between the inlet (31) and the bottom surface (35), which are between the upper and lower parts of the impeller (30). Here, the side of the impeller (30) is open so that air (A) is discharged to the outside of the impeller (30) through the space between the plurality of blades (32) by the rotation of the impeller (30).

[0037] As illustrated in FIGS. 4 and 5, the impeller band (33) is provided to be curved along the circumference of the inlet (31) of the impeller (30), that is, in the circumferential direction of the impeller (30). More specifically, the impeller band (33) includes a first curved section (36) in which the cross-section cut in the radial direction is concavely curved toward the center of the impeller (30), and a horizontal section (37) that extends a predetermined length in the radial direction from the first curved section (36) toward the center of the impeller (30). Here, the upper surface of the first curved section (36) is provided as a first semi-circular surface (36a) that is curved in a semi-circular shape. That is, the impeller band (33) is provided to be curved in a 'J' shape along the circumference of the uppermost inlet (31) of the impeller (30). Due to the curved shape of the impeller band (33), air flowing back from inside the impeller (30) can be blocked by the first arc surface (36a) of the impeller band (33).

[0038] The driving source (34) provides a driving force to drive the impeller (30). The driving source (34) is connected to the impeller (30) via a driving shaft (38) with the bottom surface (35) of the impeller (30) in between, and drives the impeller (30) to rotate around the driving shaft (38). In this embodiment, the driving source (34) is exemplified as including a rotary motor, but is not limited thereto.

[0039] The inlet ring (40) is provided along the intake port (21) of the impeller case (20) to guide the flow of air (A) sucked into the intake port (21). The inlet ring (40) is provided as a bell mouth extending circumferentially along the circumference of the intake port (21) located at the top of the impeller case (20) to guide the air (A) to the inlet port (31) of the impeller (30). This inlet ring (40) includes an extension end (41), a second curved end (42), and a backflow prevention projection (43) to increase the cross-sectional area of ​​the intake port (21) through which air (A) is sucked in without interfering with the impeller band (33).

[0040] The extension section (41) extends from the intake port (21) in the diameter direction of the impeller (30). That is, the extension section (41) extends in a straight direction from the intake port (21) toward the center of the impeller (30).

[0041] The second curved section (42) is extended curvedly from the extension section (41) so that the cross-section cut in the diameter direction of the impeller (30) has a second semi-circular surface (42a) that is curved toward the center of the impeller (30) and faces the impeller band (33). Here, the second semi-circular surface (42a) of the second curved section (42) faces the first semi-circular surface (36a) provided in the first curved section (36) of the impeller band (33).

[0042] As illustrated in the enlarged view in FIG. 5, meanwhile, the uppermost end of the first curvature section (36) and the lowermost end of the second curvature section (42) are located on a straight line (see straight line L in FIG. 5). Here, the first curvature section (36) and the second curvature section (42) are preferably spaced apart by a predetermined distance so as not to interfere with each other. In this embodiment, the distance between the first curvature section (36) and the second curvature section (42) is exemplified as being approximately 3 to 5 mm.

[0043] Additionally, the extended length of the horizontal section (37) of the impeller band (33) is a length that does not extend toward the interior of the impeller (30) beyond the second curved section (42) of the inlet ring (40). More specifically, the extended section (41) of the impeller band (33) shown in FIG. 5 is positioned at a distance from the inner surface of the second curved section (42) of the inlet ring (40) by a first distance (G1). Here, the first distance (G1) corresponds to the distance between the end of the horizontal section (37) of the impeller band (33) and a virtual vertical extension line (E) extending from the inner surface of the second curved section (42) that extends vertically toward the impeller (30). Due to this first distance (G1), the end of the horizontal section (37) is positioned inside the vertical extension line (E) of the second curved section (42). As a result, the horizontal end (37) of the impeller band (33) is positioned so as not to extend beyond the inlet ring (40) and facing the inner surface of the inlet ring (40).

[0044] The backflow prevention projection (43) extends toward the interior of the impeller case (20) at a position spaced apart from the second curved end (42) to block backflow of air (A) sucked in from the intake port (21). An impeller band (33) is positioned between this backflow prevention projection (43) and the second curved end (42). More specifically, as shown in FIG. 5, a first curved end (36) extends in a semi-circular shape from the horizontal end (37) of the impeller band (33), which is spaced a first distance (G1) from the second curved end (42) of the inlet ring (40), so as to face the second curved end (42), and is positioned in the space between the second curved end (42) and the backflow prevention projection (43). At this time, the extended length of the first curved end (36) may be positioned up to a straight line L, which is a temporary line extending from the end of the second curved end (42).

[0045] In addition, the end of the backflow prevention projection (43) is extended so as to protrude by a second interval (G2) from the lowest end of the impeller band (33). That is, the end of the backflow prevention projection (43) is arranged to protrude by a second interval (G2) from the radial direction of the first curved end (36) of the impeller band (33).

[0046] Due to the configuration of the impeller band (33) and inlet ring (40) as described above, the impeller band (33) does not extend beyond the range between the second curved end (42) of the inlet ring (40) and the backflow prevention projection (43). As a result, the air (A) sucked in through the intake port (21) of the impeller case (20) is prevented from flowing back through the impeller band (33) and the inlet ring (40). Furthermore, since the impeller band (33) and the inlet ring (40) have mutual shapes and face each other, the inlet ring (40) can be installed in close contact with the impeller band (33) with a minimum spacing. Accordingly, the suction cross-sectional area (D) of the air (A) guided into the interior of the impeller (30) by the inlet ring (40) can be maximized as shown in FIG. 4.

[0047] The intake device (50) opens and closes the flow of air (A) sucked in by the suction force generated from the impeller device (10). As shown in FIG. 2, this intake device (50) is provided to be stacked on top of the impeller device (10) to open and close the flow of air (A) including the vehicle's outside air (A1) and inside air (A2). To this end, the intake device (50) is provided with an outside air inlet (51) into which outside air (A1) is introduced and an inside air inlet (52) into which inside air (A2) is introduced, and the outside air inlet (51) and the inside air inlet (52) are opened and closed by first and second doors (54)(55).

[0048] Additionally, the intake device (50) has an intake outlet (53) formed through it at a position facing the outside air inlet (51) and the inside air inlet (52), and the intake outlet (53) is connected to the impeller device (10). More specifically, the intake outlet (53) communicates with the intake port (21) provided in the impeller case (20) of the impeller device (10).

[0049] The intake device (50) described above is connected to the impeller device (10) and guides the intake of outside air (A1) or inside air (A2) by opening either the outside air inlet (51) or the inside air inlet (52) using the suction force generated by the rotation of the impeller (30) from the impeller device (10). Additionally, the intake device (50) can guide the intake of outside air (A1) and inside air (A2) by simultaneously opening the outside air inlet (51) and the inside air inlet (52) so that they are mixed together. At this time, by adjusting the opening range of each of the outside air inlet (51) and the inside air inlet (52) of the intake device (50), it is also possible to control the mixing rate of the outside air (A1) and inside air (A2).

[0051] The blower operation of the vehicle blower system (1) according to the present invention having the above configuration will be explained with reference to FIG. 2.

[0052] As shown in FIG. 2, the impeller (30) of the impeller device (10) rotates around the drive shaft (38) by the driving force of the driving source (34). Due to the rotational force of this impeller (30), air (A) containing outside air (A1) or inside air (A2) is sucked in from either the outside air inlet (51) or the inside air inlet (52) which is opened by at least one of the first and second doors (54) (55) of the intake device (50).

[0053] As illustrated in FIGS. 3 and 4, air (A) sucked in from the intake device (50) is sucked in through the intake port (21) provided in the impeller case (20) of the impeller device (10) and guided to the inlet port (31) of the impeller (30) through the inlet ring (40). At this time, the first curved end (36) of the impeller band (33) and the second curved end (42) of the inlet ring (40) include first and second arc surfaces (36a) (42a) facing each other, so that the impeller band (33) and the inlet ring (40) can be arranged in close contact with each other with a minimum gap between them. As a result, the cross-sectional area (D) of the air (A) sucked in through the inlet ring (40) can be maximized.

[0054] That is, a first curved end (36) of the impeller band (33) is formed with a first curved arc-shaped surface (36a) facing the center of the impeller (30) with respect to the top of the impeller band (33), and a second curved end (42) with a curved arc shape is formed on the inlet ring (40) to face the first curved surface (36a). At this time, the impeller band (33) faces the inlet ring (40) in a 'J' shape. As a result, since the impeller band (33) and the inlet ring (40) do not interfere with each other even when installed in close contact with each other, the inlet ring (40) can be installed in close contact with the impeller band (33) to increase the suction cross-sectional area (D).

[0055] In addition, as shown in FIG. 5, the horizontal end (37) of the impeller band (33) is positioned at a first distance (G1) from the inner surface of the second curved end (42) of the inlet ring (40). Furthermore, a backflow prevention projection (43) is provided to protrude from the horizontal end (37) of the impeller band (33) by a second distance (G2). As a result, the impeller band (33) is positioned so as not to extend beyond the inlet ring (40), thereby more effectively blocking the backflow of air (A) between the impeller band (33) and the inlet ring (40).

[0056] Air (A) introduced into the inlet (31) of the impeller (30) by the rotational force of the impeller (30) is guided through the blade (32) to the outlet (22) of the impeller case (20) and discharged.

[0058] Referring to FIG. 6, a graph is shown that schematically compares the intake airflow efficiency of the vehicle blower system (1) according to the present invention with that of the conventional system. As shown in FIG. 6, compared to the intake airflow of the conventional system, the vehicle blower system (1) according to the present invention has superior intake airflow efficiency due to the intake cross-sectional area (D) of the air (A) widened by the inlet ring (40).

[0060] As described above, although the present invention has been explained with reference to preferred embodiments, those skilled in the art will understand that various modifications and changes can be made to the present invention without departing from the spirit and scope of the invention as set forth in the following claims. Explanation of the symbols

[0061] 1: Automotive blower system 10: Impeller device 20: Impeller case 30: Impeller 31: Inlet 32: Blade 33: Impeller band 34: Gu Dong-won 40: Inlet ring 41: Extension 42: Second curvature stage 43: Anti-backflow protrusion 50: Intake device

Claims

Claim 1 An impeller device comprising: a hollow impeller case having an air intake and an air outlet; an impeller installed inside the impeller case including an inlet communicating with the intake, which generates a suction force for the air; and an inlet ring provided at the intake of the impeller case to guide the flow of the air sucked into the intake to the inlet of the impeller; wherein the impeller band provided along the circumference of the inlet of the impeller and the inlet ring each include mutually facing semi-circular curved surfaces. Claim 2 In claim 1, the impeller band is provided in a 'J' shape, comprising a first curved section in which a cross-section cut in the diameter direction of the impeller extends in a semi-circular shape toward the center of the impeller, and a horizontal section extending in the diameter direction from the first curved section toward the center of the impeller. Claim 3 The impeller device according to claim 1, wherein the inlet ring comprises: an extension end extending from the suction port of the impeller case in the diameter direction of the impeller; and a second curved end extending curvaturely from the extension end in a semi-circular shape with a cross-section cut in the diameter direction of the impeller toward the center of the impeller, facing the impeller band. Claim 4 In paragraph 3, the impeller device comprises: an inlet ring extending toward the interior of the impeller case at a position spaced apart from the second curved end, and a backflow prevention projection that blocks the backflow of the air sucked in from the intake port. Claim 5 In paragraph 3, the second curvature end is formed convexly in the direction opposite to the direction toward the impeller band. Claim 6 In paragraph 4, the impeller band is an impeller device provided between the second curved end of the inlet ring and the backflow prevention projection. Claim 7 In claim 1, the impeller band comprises a first curved section in which a cross-section cut in the diameter direction of the impeller extends in a semi-circular shape toward the center of the impeller, and a horizontal section extending in the diameter direction from the first curved section toward the center of the impeller, and the inlet ring comprises an extension section extending in the diameter direction of the impeller from the suction port of the impeller case, a second curved section extending in a semi-circular shape in which a cross-section cut in the diameter direction of the impeller extends in a curved shape toward the center of the impeller from the extension section and faces the impeller band, and a backflow prevention projection extending toward the interior of the impeller case at a position spaced apart from the second curved section. Claim 8 In claim 7, the first curvature end is formed convexly in the opposite direction to the direction toward the second curvature end. Claim 9 An impeller device according to claim 7, wherein the impeller band is provided between the second curved end of the inlet ring and the backflow prevention projection, the horizontal end and the second curved end are spaced apart by a first interval, and the backflow prevention projection is provided to protrude by a second interval relative to the horizontal end. Claim 10 In claim 7, the impeller device is provided at a position spaced by a first interval with respect to the inner surface of the second curved end so that the horizontal end of the impeller band does not extend toward the interior of the impeller beyond the second curved end of the inlet ring. Claim 11 In claim 7, the backflow prevention projection of the inlet ring is provided to protrude toward the interior of the impeller case by a second distance from the horizontal end. Claim 12 A vehicle blower system comprising: an impeller device described in any one of claims 1 to 11 that generates a suction force for air; and an intake device that opens and closes the flow of air sucked in by the suction force generated from the impeller device. Claim 13 In claim 12, the intake device is provided with an outside air inlet and an inside air inlet into which outside air entering from the outside of the vehicle and inside air entering from the inside of the vehicle, respectively, and the outside air inlet and the inside air inlet are each opened and closed by a first and a second door, respectively, in a vehicle blower system. Claim 14 A vehicle blower system comprising: an impeller device that generates a suction force for air; and an intake device that opens and closes the flow of air sucked in by the suction force generated from the impeller device; wherein the impeller device comprises: an impeller that rotates to generate a suction force for air and has an impeller band provided in a circumferential direction at an inlet where the air is introduced; an impeller case that encloses and protects the impeller; and an inlet ring that guides the flow of air into the impeller; wherein the impeller band is provided at a position that does not extend beyond the inlet ring, and the impeller band and the inlet ring each include mutually facing semi-circular curved surfaces. Claim 15 In claim 14, the impeller band comprises a first curved end, the cross-section cut in the diameter direction of the impeller extending in a curved semi-circle shape toward the center of the impeller, and a horizontal end extending in the diameter direction from the first curved end toward the center of the impeller, and the inlet ring comprises an extension end extending in the diameter direction of the impeller from the intake port of the impeller case, a second curved end extending in a curved semi-circle shape from the extension end, the cross-section cut in the diameter direction of the impeller extending in a curved semi-circle shape toward the center of the impeller, facing the impeller band, and a backflow prevention projection extending toward the interior of the impeller case at a position spaced apart from the second curved end to block the backflow of the air sucked in from the intake port, thereby forming a vehicle blower system. Claim 16 In item 15, the impeller band is a vehicle blower system provided between the second curved end of the inlet ring and the backflow prevention projection. Claim 17 A vehicle blower system according to claim 15, wherein the impeller band is provided between the second curved end of the inlet ring and the backflow prevention projection, the horizontal end and the second curved end are spaced apart by a first interval, and the backflow prevention projection is provided to protrude toward the interior of the impeller case by a second interval relative to the horizontal end. Claim 18 In claim 14, the intake device is provided with an outside air inlet and an inside air inlet into which outside air entering from the outside of the vehicle and inside air entering from the inside of the vehicle, respectively, and the outside air inlet and the inside air inlet are each opened and closed by a first and a second door, respectively, in a vehicle blower system.

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