Blower unit for vehicle and air conditioning device including the same

Abstract

Embodiments disclosed herein relate to a blower unit for a vehicle and an air conditioning device including the blower unit. The blower unit includes: a volute shell having a suction port formed therein; a fan rotatably disposed in the volute shell; a motor having a shaft connected to the fan; and a bell mouth disposed at the suction port, wherein the inner end of the volute shell forming the suction port is arranged to be radially spaced from the fan to form a gap, and the bell mouth prevents the air flowing due to the rotation of the fan from flowing back through the gap. Therefore, the blower unit for a vehicle and the air conditioning device including the blower unit can prevent the air from flowing back to the outside of the volute shell by the arrangement of the bell mouth and the volute shell and the structural shape of the bell mouth.

Description

Technical Field

[0001] Embodiments relate to a blower unit for a vehicle and an air conditioning device including the same. Specifically, embodiments relate to a blower unit for a vehicle capable of improving drainage performance while improving air conditioning performance by preventing air backflow and an air conditioning device including the same. Background Art

[0002] The vehicle is equipped with an air conditioning device (heating, ventilation and air conditioning system (HVAC)) for adjusting the air temperature inside and ventilating the interior. The air conditioning device generates warm air to keep the vehicle interior warm, or generates cool air to keep the vehicle interior cool.

[0003] Such an air conditioning device for a vehicle is developed to have a small size and to effectively adjust the temperature and flow rate of air under a condition where it is difficult to ensure a sufficient space in an engine room of a vehicle.

[0004] Therefore, the air conditioning device may include a blower unit configured to blow air into the air conditioning housing and an air conditioning unit configured to cool or heat the air delivered by the blower unit. By improving the blower unit, the size of the air conditioning device can be reduced and the performance of the air conditioning device can be improved.

[0005] The blower unit may include a volute housing, a fan disposed in the volute housing, a motor configured to rotate the fan, and a bell mouth configured to guide air to the fan. In this case, the volute housing may guide air from the blower unit to the air conditioning unit. In addition, the volute housing may have an inlet formed to introduce air.

[0006] The bell mouth provided in the upper inlet of the volute shell may be integrated with the volute shell or the housing. However, since the fan is inserted into the volute shell from below the volute shell, the bell mouth provided in the lower inlet may be formed as a separate component. Therefore, the bell mouth provided on the lower side of the volute shell may be separately assembled to the volute shell.

[0007] In this case, the bell mouth can be formed as a separate component and assembled separately after the fan is inserted into the volute housing. In this case, because the outer diameter of the bell mouth is smaller than the outer diameter of the fan due to the nature of the assembly process, there is a problem of deterioration in the functional performance of the bell mouth.

[0008] Furthermore, since the fan is rotatably inserted and disposed in the scroll housing, a gap may be formed between the scroll housing and the fan due to structural properties.

[0009] For this reason, there may be a problem that, when the fan rotates, the air in the scroll casing flows back to the outside of the scroll casing through the gap and the inlet.

[0010] Additionally, there is the problem of the fan freezing during the winter when moisture is introduced into the scroll housing. Summary of the invention

[0011] Technical issues

[0012] The embodiment provides a blower unit for a vehicle capable of preventing air from flowing back to the outside of a scroll housing by arrangement of a bell mouth and a scroll housing and a shape of the bell mouth for guiding air, and an air conditioning apparatus including the same.

[0013] Another embodiment provides a blower unit for a vehicle capable of improving drainage performance by forming a drainage structure on a bell mouth to discharge moisture, and an air conditioning apparatus including the blower unit.

[0014] Still another embodiment provides a blower unit for a vehicle capable of forming two air flow layers to improve air conditioning performance using external air and internal air, and an air conditioning apparatus including the blower unit.

[0015] Still another embodiment provides a blower unit for a vehicle capable of improving vibration resistance using a bell mouth having one side fixed to a drive unit for operating a fan and the other side disposed to be supported on and in contact with a volute casing, and an air conditioning apparatus including the blower unit.

[0016] Objects that should be solved according to the embodiments are not limited to the above-described objects, and other objects not described above should be clearly understood by those skilled in the art from the following description.

[0017] Technical Solution

[0018] The above-mentioned technical problem is solved by a blower unit for a vehicle, which includes: a volute casing having an inlet; a fan rotatably arranged in the volute casing; a motor having a shaft connected to the fan; and a bell mouth arranged in the inlet, wherein an inner end of the volute casing defining the inlet is arranged to be spaced apart from the fan in a radial direction to define a separation space, and wherein an outer end of the bell mouth is arranged to overlap with the inner end of the volute casing in an axial direction to prevent air flowing due to the rotation of the fan from flowing back to the outside of the volute casing through the separation space.

[0019] In this case, the bell mouth may include a band portion having a ring shape and a leg portion protruding from a lower portion of the band portion and coupled to the motor, and an outer end of the band portion may contact an inner end of the volute housing.

[0020] In addition, the strip portion may include: a main body; an inner wheel portion protruding upward from the inner end of the main body; and an outer wheel portion protruding upward from the outer end of the main body, and the end surface of the outer wheel portion may contact the lower surface of the inner end of the volute shell.

[0021] In addition, the volute shell may further include a first protrusion protruding upward from the inner end of the volute shell, and an end surface of the outer wheel portion contacting the lower surface of the inner end of the volute shell may be arranged to overlap with the first protrusion in the axial direction.

[0022] In addition, the scroll housing may further include a guide protruding downward from an inner end of the scroll housing, and the guide may support one side of the outer wheel portion.

[0023] In addition, the strip portion may include: a main body; an inner wheel portion protruding upward from the inner end of the main body; an outer wheel portion protruding upward from the outer end of the main body; and a flange portion protruding from the outer wheel portion in the radial direction, and the flange portion can contact the lower surface of the inner end of the volute shell.

[0024] In this case, the outer wheel portion may be arranged to be higher than the upper surface of the inner end of the volute housing. In addition, the upper side of the outer wheel portion may be arranged to overlap with the lower fan of the fan in the radial direction. In this case, based on the main body of the band-shaped portion, the end surface of the outer wheel portion may be arranged to be higher than the end surface of the inner wheel portion.

[0025] In addition, the volute shell may further include a second protrusion that protrudes downward from the inner end of the volute shell, and the second protrusion may be disposed in a first groove that is concavely formed in the flange portion. In this case, the flange portion may further include a second groove that is connected to the first groove in the radial direction.

[0026] Furthermore, the band-shaped portion may include a hole penetrating the body in the axial direction.

[0027] In addition, the fan may include: an upper fan; and a lower fan, which is arranged below the upper fan, and the volute shell may include: an upper volute shell; a lower volute shell; and a partition wall, which is arranged between the upper volute shell and the lower volute shell to define a first channel and a second channel, and the airflow formed by the rotation of the upper fan can move through the first channel, and the airflow formed by the rotation of the lower fan can move through the second channel.

[0028] In addition, the fan may further include a barrier disposed between the inner wheel portion and the outer wheel portion.

[0029] The above-mentioned technical problem is solved by an air conditioning device, which includes: a blower unit; and an air conditioning unit, which is configured to cool or heat the air delivered by the blower unit, wherein the blower unit includes: a housing; a volute casing, which is arranged in the housing and has an inlet; a fan, which is rotatably arranged in the volute casing; a motor, which has a shaft connected to the fan; and a bell mouth, which is arranged in the inlet, wherein the inner end of the volute casing defining the inlet is arranged to be spaced apart from the fan in a radial direction to define a separation space, and wherein the outer end of the bell mouth is arranged to overlap with the inner end of the volute casing in an axial direction to prevent the air flowing due to the rotation of the fan from flowing back to the outside of the volute casing through the separation space.

[0030] Beneficial Effects

[0031] According to the blower unit for a vehicle and the air conditioning apparatus including the same according to the embodiment, air can be prevented from flowing back to the outside of the scroll housing by means of the arrangement of the bell mouth and the scroll housing and the structural shape of the bell mouth.

[0032] In addition, according to an embodiment, a drainage structure for draining moisture may be formed on the bell mouth, thereby preventing the bell mouth from being frozen due to moisture.

[0033] In addition, according to an embodiment, when adjusting the temperature inside the vehicle, by using a fan and a volute shell configured to form two air flow layers, external air and internal air can be used. Therefore, the air conditioning device can improve air conditioning performance. In this case, the internal air may refer to the air inside the vehicle, and the external air may refer to the air outside the vehicle.

[0034] In addition, in a state where the bell mouth is fixed to a drive unit for operating the fan by the legs, the bell mouth can be supported on the volute casing, which makes it possible to improve vibration resistance.

[0035] Useful advantages and effects of the embodiments are not limited to the above and will be more easily understood when a specific embodiment is described. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is a view illustrating an air conditioning apparatus for a vehicle according to an embodiment.

[0037] Figure 2 is a perspective view illustrating a blower unit for a vehicle according to a first embodiment.

[0038] Figure 3 is an exploded perspective view illustrating a blower unit for a vehicle according to a first embodiment.

[0039] Figure 4 is a cross-sectional view illustrating a blower unit for a vehicle according to a first embodiment.

[0040] Figure 5 is a perspective sectional view illustrating a blower unit for a vehicle according to a first embodiment.

[0041] Figure 6 is a perspective view illustrating a bell mouth provided in the blower unit for a vehicle according to the first embodiment.

[0042] Figure 7 is a cross-sectional view illustrating a bell mouth provided in the blower unit for a vehicle according to the first embodiment.

[0043] Figure 8 is an exploded perspective view illustrating a blower unit for a vehicle according to a second embodiment.

[0044] Fig. 9 is a cross-sectional view illustrating a blower unit for a vehicle according to a second embodiment.

[0045] Fig.10 is a perspective sectional view illustrating a blower unit for a vehicle according to a second embodiment.

[0046] Fig.11 is a perspective view illustrating a bell mouth provided in a blower unit for a vehicle according to a second embodiment.

[0047] Fig.12 is a cross-sectional view illustrating a bell mouth provided in a blower unit for a vehicle according to a second embodiment. DETAILED DESCRIPTION

[0048] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0049] However, the technical spirit of the present invention is not limited to some embodiments to be described and may be implemented using various other embodiments, and at least one component of the embodiments may be selectively combined, replaced, and used to implement the technical spirit within the scope of the technical spirit.

[0050] In addition, unless otherwise clearly and specifically defined by the context, all terms used herein (including technical terms and scientific terms) may be interpreted as having customary meanings to technicians in the field, and the meanings of general terms such as terms defined in commonly used dictionaries will be interpreted by considering the contextual meanings of the relevant technology.

[0051] In addition, the terms used in the embodiments of the present invention are considered in a descriptive sense rather than for limiting the present invention.

[0052] In this specification, unless the context clearly indicates otherwise, the singular form includes its plural form, and in the case of describing "at least one (or one or more) of A, B and C", this may include at least one combination of all combinations that can be combined with A, B and C.

[0053] When describing components of the present invention, terms such as "first," "second," "A," "B," "(a)," and "(b)" may be used.

[0054] These terms are used only to distinguish one element from another element, and the nature, order, etc. of the elements are not limited by these terms.

[0055] It should be understood that when an element is referred to as being “connected or coupled” to another element, such description may include the case where the one element is directly connected or coupled to the other element and the case where the one element is connected or coupled to the other element with another element disposed therebetween.

[0056] In the case where any element is described as being formed or disposed “on or under” another element, such description includes both the case where the two elements are formed or disposed so as to be in direct contact with each other and the case where one or more other elements are interposed between the two elements. In addition, when an element is described as being disposed “on or under” another element, such description may include the case where the one element is disposed on the upper side or the lower side relative to the other element.

[0057] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The same or mutually corresponding components will be denoted by the same reference numerals regardless of the figure numbers, and redundant descriptions will be omitted.

[0058] When air outside a vehicle (hereinafter referred to as "outside air") is introduced into the interior of the vehicle, or when air inside the vehicle (hereinafter referred to as "inside air") is circulated, an air conditioning device for a vehicle according to an embodiment can heat or cool the interior of the vehicle by heating or cooling the outside air and the inside air.

[0059] An air conditioning device for a vehicle may include a blower unit configured to blow inside air and outside air into an air conditioning housing and an air conditioning unit configured to cool or heat the air blown into the air conditioning housing by the blower unit. In this case, the air conditioning unit may adjust the temperature of the air introduced into the vehicle interior using a heat exchange medium such as a refrigerant and a heat exchanger configured to allow the heat exchange medium to exchange heat with the air introduced into the air conditioning housing.

[0060] Figure 1 is a view illustrating an air conditioning apparatus for a vehicle according to an embodiment.

[0061] Reference Figure 1 , the air conditioning apparatus for a vehicle according to the embodiment may include a blower unit 1 or 1a and an air conditioning unit 2 configured to cool or heat the air delivered by the blower unit 1 or 1a. In this case, the blower unit 1 or 1a may deliver air to the air conditioning unit 2 by forming two air flow layers. Therefore, the air conditioning apparatus for a vehicle may improve air conditioning performance.

[0062] First embodiment

[0063] Figure 2 is a perspective view illustrating a blower unit for a vehicle according to a first embodiment, Figure 3 is an exploded perspective view illustrating a blower unit for a vehicle according to a first embodiment, Figure 4 is a cross-sectional view illustrating a blower unit for a vehicle according to a first embodiment, Figure 5 is a perspective sectional view illustrating a blower unit for a vehicle according to a first embodiment, Figure 6 is a perspective view illustrating a bell mouth provided in a blower unit for a vehicle according to a first embodiment, and Figure 7 1 is a cross-sectional view illustrating a bell mouth provided in a blower unit for a vehicle according to a first embodiment. In this case, based on an axis provided in the blower unit for a vehicle, an x ​​direction may be defined as a radial direction, and a y direction may be defined as an axial direction, as shown in FIG. Figure 1 and Figure 3 In this case, the x-direction and the y-direction may be perpendicular to each other.

[0064] Reference Figures 1 to 7A blower unit 1 for a vehicle according to a first embodiment may include a housing 100, a volute housing 200 disposed in the housing 100, a fan 300 rotatably disposed in the volute housing 200, a driving unit 400 configured to rotate the fan 300, and a bell mouth 500 disposed between the fan 300 and the driving unit 400 and configured to guide air to the fan 300.

[0065] In this case, the bell mouth 500 may be provided in the inlet 221 formed at the lower side of the scroll housing 200 and guide the air. In this case, the driving unit 400 may include a shaft 410 coupled to the fan 300 and a motor 420 configured to rotate the shaft 410 .

[0066] The housing 100 may define an outer shape of the blower unit 1 for a vehicle.

[0067] Reference Figure 1 , the housing 100 may include an upper housing 110 and a lower housing 120 that are configured to define an accommodation space therein. In addition, a hole is formed in the lower housing 120. Therefore, the air blowing module including the fan 300 and the bell mouth 500 mounted on the driving unit 400 may be disposed in the housing 100 through the hole. In this case, the fan 300 may be disposed in the volute housing 200 through the inlet 221 of the volute housing 200.

[0068] The scroll housing 200 may be disposed in the housing 100 and guide an airflow formed by the rotation of the fan 300 to the air conditioning unit 2. In this case, the scroll housing 200 may include an inlet formed to introduce external air or internal air.

[0069] The scroll housing 200 may include an upper scroll housing 210, a lower scroll housing 220, and a partition wall 230 disposed between the upper scroll housing 210 and the lower scroll housing 220 to define a first passage C1 and a second passage C2. Therefore, the scroll housing 200 may guide air into the air conditioning unit 2 by forming two air flow layers.

[0070] In addition, the upper scroll housing 210 may have an inlet provided for introducing external air. In addition, the lower scroll housing 220 may have an inlet 221 provided for introducing internal air.

[0071] Reference Figure 5 , the lower volute casing 220 may include a first protrusion 223 protruding upward from an inner end 222 thereof.

[0072] The first protrusion 223 may upwardly guide the airflow transferred to the inner end 222. Therefore, the first protrusion 223 may mainly block the air flow that may be formed toward the band-shaped portion 510 of the bell mouth 500, thereby preventing the air from flowing backward.

[0073] In addition, the lower volute housing 220 may include a guide member 224 protruding downward from the inner end 222. Figure 5 As illustrated in FIG. 2 , the guide 224 may be disposed to be spaced outwardly from the first protrusion 223 based on a radial direction.

[0074] In this case, the guide 224 may guide the arrangement of the bell mouth 500 .

[0075] In addition, the guide member 224 may support one side of the bell mouth 500. Therefore, the guide member 224 may improve the vibration resistance of the bell mouth 500.

[0076] That is, the blower unit 1 can improve vibration resistance by implementing a two-point support structure by means of the leg 520 coupled to the motor 420 and the guide 224 for supporting the band portion 510 of the bell mouth 500. For example, the guide 224 can improve vibration resistance against vibrations generated in the radial direction, and the leg 520 can improve vibration resistance against vibrations generated in the axial direction.

[0077] The fan 300 may be rotatably disposed in the volute housing 200. In addition, the fan 300 may rotate in conjunction with the rotation of the shaft 410. In addition, the airflow generated by the rotation of the fan 300 may be guided by the volute housing 200. In this case, the fan 300 may be a multi-blade fan or a radial fan.

[0078] The fan 300 may include an upper fan 310 and a lower fan 320 disposed below the upper fan 310 .

[0079] The upper fan 310 may be disposed to correspond to the first channel C1. Therefore, the airflow generated by the rotation of the upper fan 310 may move through the first channel C1. Figure 1 As illustrated in FIG. 1 , the external air may form an airflow F1 flowing toward the first channel C1 due to the rotation of the upper fan 310 .

[0080] The lower fan 320 may be disposed to correspond to the second channel C2. Therefore, the airflow generated by the rotation of the lower fan 320 may move through the second channel C2. Figure 1 As illustrated in FIG. 1 , the internal air may form an airflow F2 flowing toward the second channel C2 due to the rotation of the lower fan 320 .

[0081] Therefore, the blower unit 1 can form airflow F1 and airflow F2 using the scroll housing 200 and the fan 300 so that air is delivered to the air conditioning unit 2. Therefore, the air conditioning apparatus according to the embodiment can improve air conditioning performance by using the airflow F1 and airflow F2 of the outside air and the inside air.

[0082] The driving unit 400 may rotate the fan 300. In this case, the driving unit 400 may be coupled to the housing 100.

[0083] Reference Figure 3 , the driving unit 400 may include a shaft 410 coupled to the fan 300 and a motor 420 configured to rotate the shaft 410. In this case, the motor 420 may include a motor flange 421 formed to be coupled to the housing 100 and the bell mouth 500. In this case, the motor flange 421 may be a region of a configuration for defining an outer shape of the motor 420 and referred to as a motor body.

[0084] Reference Figure 2 and Figure 3 The scroll housing 200 may include a passage formed on one side to guide air to flow toward the air conditioning unit 2 and a wall disposed to face the fan 300 in a radial direction of the fan 300. Therefore, an airflow to the passage may be formed by the rotation of the fan 300.

[0085] In this case, since the fan 300 is rotatably disposed in the scroll housing 200 , the inner end 222 of the lower scroll housing 220 defining the inlet 221 may be disposed to be spaced apart from the lower fan 320 in a radial direction, thereby defining a separation space, ie, a gap.

[0086] Therefore, the bell mouth 500 of the blower unit for a vehicle according to the embodiment may be provided to close the separation space, thereby preventing air from flowing back to the outside of the lower scroll housing 220. In this case, the bell mouth 500 may be provided in the inlet 221 and guide the internal air toward the center of the lower fan 320.

[0087] Considering the rotation of the fan 300, it is difficult to dispose the bell mouth 500 so that the bell mouth 500 contacts the fan 300. However, even if the bell mouth 500 is disposed to be spaced apart from the fan 300, the shape of the bell mouth 500 capable of guiding airflow can prevent backflow.

[0088] Reference Figure 6 , the bell mouth 500 may include a band portion 510 having a ring shape and a leg portion 520 protruding from a lower portion of the band portion 510 and coupled to the motor 420 .

[0089] Reference Figure 4 and Figure 5 , a portion of the strip portion 510 may be disposed below the lower fan 320. In this case, the outer end of the strip portion 510 may be disposed in contact with the inner end 222 of the lower scroll housing 220. For example, Figure 4 As illustrated in FIG. 5 , the band-shaped portion 510 may be disposed to overlap with the separation space in the axial direction.

[0090] That is, the belt-shaped portion 510 may be disposed in the axial direction of the separation space and function as a cover covering the lower side of the separation space.

[0091] Therefore, the band portion 510 may close the separation space to prevent the air flowing in the scroll housing 200 from flowing back to the outside of the scroll housing 200 through the separation space.

[0092] However, considering the arrangement relationship with the rotary fan 300, the strip portion 510 disposed below the lower fan 320 may be disposed to be spaced apart from the lower fan 320 in the axial direction. However, the strip portion 510 may have a structure for guiding air into the scroll housing 200, thereby preventing backflow.

[0093] For example, the vertical cross-section of the strip-shaped portion 510 may have a “U” shape. Therefore, the strip-shaped portion 510 may be used to guide the airflow upward, thereby preventing the backflow.

[0094] like Figure 6 and Figure 7 As illustrated in FIG. 4 , the band portion 510 may include a body 511 having an annular shape and an inner wheel portion 512 protruding upward from an inner end of the body 511. In this case, the inside may mean a direction toward the central axis C of the shaft 410. In addition, the outside may mean a direction opposite to the inside.

[0095] In addition, the band portion 510 may further include an outer wheel portion 513 protruding upward from an outer end of the body 511 .

[0096] In addition, the band-shaped portion 510 may further include a hole 514 formed to penetrate the body 511 in the axial direction.

[0097] In this case, the body 511 , the inner wheel portion 512 , and the outer wheel portion 513 may be integrated.

[0098] The band portion 510 can guide airflow upward by means of the inner and outer wheels 512 and 513 protruding from the inner and outer sides of the body 511, respectively, thereby preventing air from being discharged to the inlet 221. Therefore, the band portion 510 can improve the blowing performance of the blower unit 1.

[0099] Furthermore, the belt-shaped portion 510 may guide the two air flows upward by means of the inner wheel portion 512 and the outer wheel portion 513 disposed to be spaced apart from each other in the radial direction, thereby more effectively preventing the backflow.

[0100] The inner wheel portion 512 may protrude upward from the inner end of the body 511. Therefore, the inner surface 512a of the inner wheel portion 512 may guide the internal air to the fan 300. In addition, the outer surface 512b of the inner wheel portion 512 may guide the air introduced into the body 511 upward.

[0101] The outer wheel portion 513 may be provided at an outer end of the band portion 510 .

[0102] The outer wheel portion 513 may protrude upward from the outer end of the main body 511. In this case, the outer wheel portion 513 may protrude and be disposed to be spaced apart from the inner wheel portion 512 in the radial direction. Therefore, the outer wheel portion 513 of the band-shaped portion 510 may have a structure that guides two air flows upward together with the inner wheel portion 512. For example, the inner surface 513a of the outer wheel portion 513 may guide the air introduced into the main body 511 upward. In addition, the air guided upward may move to the air conditioning unit 2 through the second channel C2.

[0103] In this case, the upper surface of the outer ring portion 513 as the end surface 513b may be disposed to contact the lower surface of the inner end 222 of the scroll housing 200. In addition, the end surface 513b of the outer ring portion 513 may be disposed to overlap the first protrusion 223 in the axial direction.

[0104] Therefore, since the first protrusions 223 extend along the inner surface 513 a of the outer wheel portion 513 , the directivity of the airflow guided upward by the outer wheel portion 513 may be maintained by the first protrusions 223 .

[0105] The hole 514 may penetrate the body 511 in the axial direction. Therefore, the hole 514 may implement a drainage structure of the strip portion 510. For example, when moisture is collected in the strip portion 510, the moisture may be discharged through the hole 514. Therefore, the hole 514 may improve drainage performance.

[0106] The leg 520 may be coupled to the motor flange 421, thereby improving vibration resistance. In this case, a plurality of legs 520 may be provided, and the plurality of legs 520 may be spaced apart from each other in the circumferential direction.

[0107] As described above, the bell mouth 500 provided in the lower volute shell 220 may also be provided in the inlet formed in the upper volute shell 210. However, the bell mouth provided in the upper volute shell 210 may be coupled to the housing 100 without being coupled to the motor 420, but the present disclosure is not necessarily limited thereto. For example, the bell mouth provided in the upper volute shell 210 may be integrated with the housing 100.

[0108] Furthermore, the fan 300 of the blower unit 1 may further include a barrier 330 .

[0109] The barrier 330 can more effectively prevent backflow together with the inner wheel portion 512 and the outer wheel portion 513 of the belt-shaped portion 510 .

[0110] Reference Figure 5 , the barrier 330 may be formed in the circumferential direction of the lower fan 320. In addition, the barrier 330 may be disposed between the inner wheel portion 512 and the outer wheel portion 513 in the radial direction.

[0111] In this case, a portion of the barrier 330 may be disposed to overlap the inner wheel portion 512 in the radial direction.

[0112] Reference Figure 5 , the upper surface of the inner wheel portion 512 as the end surface 512c can be set higher than the lower surface 331 of the barrier 330. Therefore, the barrier 330 together with the inner wheel portion 512 can more effectively prevent backflow.

[0113] Second embodiment

[0114] Figure 8 is an exploded perspective view illustrating a blower unit for a vehicle according to a second embodiment, Fig. 9 is a cross-sectional view illustrating a blower unit for a vehicle according to a second embodiment, Fig.10 is a perspective sectional view illustrating a blower unit for a vehicle according to a second embodiment, Fig.11 is a perspective view illustrating a bell mouth provided in a blower unit for a vehicle according to a second embodiment, and Fig.12 is a cross-sectional view illustrating a bell mouth provided in a blower unit for a vehicle according to a second embodiment.

[0115] The blower unit 1 for a vehicle according to the first embodiment is compared with the blower unit 1 for a vehicle according to the first embodiment. Figure 1 and Figures 8 to 12 A comparison is made between the blower unit 1a for a vehicle according to the second embodiment described, which is different from the blower unit 1 for a vehicle according to the first embodiment in terms of the shape and arrangement relationship between the lower volute casing 220a and the bell mouth 500a.

[0116] Specifically, the blower unit 1a for a vehicle according to the second embodiment differs from the blower unit 1 for a vehicle according to the first embodiment in that the blower unit 1a for a vehicle according to the second embodiment includes an outer wheel portion 513 formed to be higher than the inner end 222 of the lower volute casing 220a, instead of the first protrusion 223 of the blower unit 1 for a vehicle according to the first embodiment.

[0117] In this case, since the bell mouth 500a can be assembled as a separate member, the length and position of the outer wheel portion 513 can be easily changed in design according to the type of vehicle. Therefore, the bell mouth 500a made by adjusting only the shape of the outer wheel portion 513 according to the type of vehicle can be easily applied to the blower unit 1a for the vehicle.

[0118] Hereinafter, in describing the blower unit 1a for a vehicle according to the second embodiment, constituent elements identical to those of the blower unit 1 for a vehicle according to the first embodiment will be assigned the same reference numerals and detailed description thereof will be omitted.

[0119] Reference Figure 1 and Figures 8 to 12 The blower unit 1a for a vehicle according to the second embodiment may include a housing 100, a volute housing 200a disposed in the housing 100, a fan 300 rotatably disposed in the volute housing 200a, a driving unit 400 configured to rotate the fan 300, and a bell mouth 500a disposed between the fan 300 and the driving unit 400 and configured to guide air. In this case, the bell mouth 500a may be disposed in an inlet 221 formed at a lower side of the volute housing 200a and guide air.

[0120] The scroll housing 200a may be disposed in the housing 100 and guide an air flow formed by the rotation of the fan 300. In this case, the scroll housing 200a may include an inlet formed to introduce external air or internal air.

[0121] The scroll housing 200a may include an upper scroll housing 210, a lower scroll housing 220a, and a partition wall 230 disposed between the upper scroll housing 210 and the lower scroll housing 220a to define a first passage C1 and a second passage C2. Therefore, the scroll housing 200a may guide the airflow formed by the fan 300 into the air conditioning unit 2 by forming two airflow layers.

[0122] Reference Fig.10 The lower volute casing 220 a may include a second protrusion 225 protruding downward from the inner end 222 .

[0123] The second protrusion 225 may be coupled to the band portion 510 a of the bell mouth 500 a , thereby improving vibration resistance.

[0124] When the vehicle is running, depending on the state of the road surface, vibration in the axial direction may be generated in the vehicle, and the vibration in the axial direction is higher than the vibration in the radial direction. In this case, in order to more effectively cope with the vibration in the axial direction, the second protrusion 225 can support one side of the belt-shaped portion 510a, thereby further improving the vibration resistance.

[0125] In addition, since the second protrusion 225 is provided in the first groove 516 of the belt-shaped portion 510 a , it is possible to improve the vibration resistance against the vibration generated in the radial direction and improve the coupling property and the supporting force due to the coupling.

[0126] In addition, the second protrusion 225 may be coupled to the band portion 510 a , thereby guiding the arrangement of the bell mouth 500 a .

[0127] The fan 300 is rotatably disposed in the scroll housing 200 , and an inner end 222 of the lower scroll housing 220 a defining the inlet 221 may be disposed to be spaced apart from the lower fan 320 in a radial direction, thereby defining a separation space, ie, a gap.

[0128] Therefore, the bell mouth 500a can be set to close the separation space, thereby preventing air from flowing back to the outside of the lower volute shell 220a. Considering the rotation of the fan 300, it is difficult to set the bell mouth 500a so that the bell mouth 500a contacts the fan 300. However, the shape of the bell mouth 500a that can guide the airflow can prevent backflow.

[0129] In this case, the bell mouth 500 a may be provided in the inlet 221 and guide the internal air toward the center of the lower fan 320 .

[0130] Reference Fig.11 The bell mouth 500 a may include a band portion 510 a having a ring shape and a leg portion 520 protruding from a lower portion of the band portion 510 a and coupled to the motor 420 .

[0131] The band portion 510a may be disposed below the lower fan 320. In this case, the outer end of the band portion 510a may be disposed to contact the inner end 222 of the lower scroll casing 220a and to overlap the separation space in the axial direction.

[0132] That is, the belt-shaped portion 510a may be disposed in the axial direction of the separation space and function as a cover covering the lower side of the separation space.

[0133] Therefore, the band portion 510 a may close the separation space to prevent the air flowing in the scroll housing 200 from flowing back to the outside of the scroll housing 200 through the inlet 221 .

[0134] However, considering the arrangement relationship with the rotary fan 300, the strip portion 510a disposed below the lower fan 320 may be disposed to be spaced apart from the lower fan 320. However, the strip portion 510a may have a structure for guiding air into the scroll housing 200, thereby preventing backflow.

[0135] like Fig.11 and Fig.12 As illustrated in FIG. 1 , the band portion 510a may include a body 511 having an annular shape, an inner wheel portion 512 protruding upward from the inner end of the body 511, an outer wheel portion 513 protruding upward from the outer end of the body 511, and a flange portion 515 protruding in a radial direction from the outer wheel portion 513. In this case, the flange portion 515 may be provided to contact the lower surface of the inner end 222 of the lower volute shell 220.

[0136] In addition, the band-shaped portion 510 a may further include a hole 514 formed to penetrate the body 511 in the axial direction.

[0137] In addition, in order to discharge moisture and couple the second protrusion 225 of the lower scroll casing 220 a , the band portion 510 a may include a first groove 516 and a second groove 517 formed in the flange portion 515 .

[0138] The outer wheel portion 513 of the belt-shaped portion 510a may be disposed higher than the upper surface of the inner end 222. In this case, the upper side of the outer wheel portion 513 may be disposed to overlap with the lower side of the lower fan 320 in the radial direction.

[0139] Reference Figures 10 to 12 Since the end surface 513b of the outer wheel portion 513 is set higher than the upper surface 222a of the inner end 222 of the lower volute shell 220a, the outer wheel portion 513 can guide the airflow moving to the inner end 222 upward. Therefore, the outer surface 513c of the outer wheel portion 513 can mainly block the air that may be generated from flowing toward the center of the strip portion 510a of the bell mouth 500a.

[0140] In addition, the end surface 512c of the inner wheel portion 512 may be disposed to be higher than the upper surface 222a of the inner end 222 of the lower scroll casing 220a.

[0141] The flange portion 515 may be provided to protrude in the radial direction from the outer ring portion 513. Therefore, the flange portion 515 may be provided at the outer end of the band-shaped portion 510a.

[0142] In addition, the flange portion 515 may be provided to contact with a lower surface of the inner end 222 of the lower scroll casing 220 and prevent backflow.

[0143] The first groove 516 may be concavely formed in the circumferential direction in the flange portion 515. For example, the first groove 516 may be formed along the outer ring portion 513. In addition, the second protrusion 225 may be provided in the first groove 516. Therefore, the second protrusion 225 may be provided to overlap with the flange portion 515 in the axial direction.

[0144] The second groove 517 may be connected to the first groove 516 in the radial direction.

[0145] Therefore, the second groove 517 together with the first groove 516 can realize a drainage channel as a drainage structure of the flange portion 515. For example, when moisture is collected in the first groove 516, the moisture can be discharged through the second groove 517. Therefore, the first groove 516 and the second groove 517 can improve the drainage performance of the blower unit 1a.

[0146] Furthermore, the fan 300 of the blower unit 1 a may further include a barrier 330 .

[0147] Although the present invention has been described with respect to exemplary embodiments, it will be appreciated by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the present invention as defined in the appended claims. It will be appreciated that differences associated with modifications and changes are included in the scope of the embodiments as defined in the appended claims.

[0148] <Description of Main Reference Symbols in the Drawings>

[0149] 1, 1a: Blower unit for vehicle, 2: Air conditioning unit, 100: Housing, 200: Scroll housing, 210: Upper Scroll housing, 220: Lower Scroll housing, 221: Inlet, 223: First protrusion, 224: Guide, 225: Second protrusion, 300: Fan, 310: Upper fan, 320: Lower fan, 330: Barrier, 400: Driving unit, 410: Shaft, 420: Motor, 500, 500a: Bell mouth, 510, 510a: Strip portion.

Claims

1. A blower unit for a vehicle, the blower unit comprising: a volute housing having an inlet; a fan rotatably disposed in the scroll housing; a motor having a shaft coupled to the fan; as well as a bell mouth disposed in said inlet, wherein an inner end of the volute housing defining the inlet is arranged to be spaced apart from the fan in a radial direction to define a separation space, and The outer end of the bell mouth is arranged to overlap with the inner end of the volute shell in the axial direction to prevent the air flowing due to the rotation of the fan from flowing back to the outside of the volute shell through the separation space. The bell mouth includes: a band portion having a ring shape; and a leg portion protruding from a lower portion of the band portion and coupled to the motor. The strip-shaped portion includes: a main body; an inner wheel portion protruding upward from the inner end of the main body; and an outer wheel portion protruding upward from the outer end of the main body. The volute housing further comprises: a first protrusion protruding upward from the inner end of the volute housing; and a guide protruding downward from the inner end of the volute housing. wherein the end surface of the outer wheel portion in contact with the lower surface of the inner end of the volute housing overlaps with the first protrusion in the axial direction to guide the airflow moving toward the inner end upward, and Wherein, the guide member supports one side of the outer wheel portion.

2. The blower unit according to claim 1, wherein: The band-shaped portion includes a hole penetrating the body in the axial direction.

3. The blower unit according to claim 1, wherein: The fan comprises: Upper fan; and a lower fan, which is arranged below the upper fan, Wherein, the volute shell comprises: Upper volute casing; a lower volute casing; and a partition wall disposed between the upper scroll shell and the lower scroll shell to define a first passage and a second passage, and wherein an airflow formed by the rotation of the upper fan moves through the first passage, and an airflow formed by the rotation of the lower fan moves through the second passage.

4. The blower unit according to claim 1, wherein: The fan further includes a barrier disposed between the inner wheel portion and the outer wheel portion.

5. An air conditioning device, comprising: Blower unit; as well as an air conditioning unit configured to cool or heat the air delivered by the blower unit, Wherein, the blower unit comprises: case; a volute casing disposed in the housing and having an inlet; a fan rotatably disposed in the scroll housing; a motor having a shaft coupled to the fan; and a bell mouth disposed in said inlet, wherein an inner end of the volute housing defining the inlet is arranged to be spaced apart from the fan in a radial direction to define a separation space, and The outer end of the bell mouth is arranged to overlap with the inner end of the volute shell in the axial direction to prevent the air flowing due to the rotation of the fan from flowing back to the outside of the volute shell through the separation space. The bell mouth includes: a band portion having a ring shape; and a leg portion protruding from a lower portion of the band portion and coupled to the motor. The strip-shaped portion includes: a main body; an inner wheel portion protruding upward from the inner end of the main body; and an outer wheel portion protruding upward from the outer end of the main body. The volute housing further comprises: a first protrusion protruding upward from the inner end of the volute housing; and a guide protruding downward from the inner end of the volute housing. wherein the end surface of the outer wheel portion in contact with the lower surface of the inner end of the volute housing overlaps with the first protrusion in the axial direction to guide the airflow moving toward the inner end upward, and Wherein, the guide member supports one side of the outer wheel portion.

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