JP2009274494A - Vehicular air-conditioning unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular air-conditioning unit capable of reducing a suction ventilation resistance and restricting occurrence of suction sound irrespective of that a mainstream direction of fan sucked air crosses with a fan rotating axis at a right angle. <P>SOLUTION: An air-conditioning unit Rr. C/U for rear seats comprises a blower unit 10 having a scroll casing 18, a sub-suction port 25, a blower fan 20 and a fan motor 22, wherein a major flow direction Ds of fan sucked air is a direction of crossing a fan rotating axis CL at a right angle by a panel outer surface 16a arranged near the sub-suction port 25, a first annular bell mouth 28 and a second annular bell-mouth 29 that are coaxial to each other are arranged at a suction opening position in the scroll casing 18, the sub-suction port 25 is divided into a first suction port 30 for a first suction flow passage 32, and a second suction port 31 for a second suction flow passage 33, and the first suction port 30 is set by a step space H formed by making the second bell-mouth 29 rather than the first bell-mouth 28 approach a panel wall surface. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an air conditioner for a vehicle in which a main flow direction of fan suction air is perpendicular to a fan rotation axis by a wall surface disposed close to a suction port of a blower unit, such as an air conditioner for a rear seat. .

  Conventionally, a rear seat air conditioner in which a blower unit and a rear cooler unit are arranged in a panel space formed by an outer panel that is an exterior plate of a vehicle and an inner panel that is an interior plate of a passenger compartment is known ( For example, see Patent Document 1).

In this rear seat air conditioner, when the blower fan is driven to rotate, the air is sucked from the suction port set with the bell mouth of the blower unit, and the wind is sent out to the rear cooler unit in which the evaporator is arranged.
JP-A-9-118121

  However, in the conventional rear seat air conditioner, the main flow direction of the fan suction air is in a direction (lateral direction) perpendicular to the fan rotation axis due to the wall surface arranged close to the suction port. Of the area, only the central part where the suction negative pressure is high becomes the effective area of the suction wind that bends the main flow direction and introduces the wind. Therefore, for example, as in the case of a blower unit of a front seat air conditioner, the main flow direction of the fan suction air is the fan rotation axis direction, and the suction air is larger than the suction opening effective area. The effective area of is reduced. As described above, as the effective area of the suction air is reduced, the suction ventilation resistance is increased, and there is a problem that the flow of the wind is disturbed in the suction region and the suction sound (go sound) is generated.

  The present invention has been made paying attention to the above-mentioned problem, and although the main flow direction of the fan suction air is perpendicular to the fan rotation axis, the suction ventilation resistance is lowered and the generation of the suction noise is suppressed. An object of the present invention is to provide a vehicle air conditioner that can be used.

In order to achieve the above object, the present invention includes a scroll casing, a suction port, a blower fan, and a blower unit having a fan motor. In the vehicle air conditioner that is the direction orthogonal to the fan rotation axis,
An annular first bell mouth is disposed at the suction opening position of the scroll casing, and an annular second bell mouth by a coaxial center is disposed at an inner peripheral side position of the first bell mouth,
The suction port includes a first suction port into a first suction channel formed by being surrounded by an inner peripheral surface of the first bell mouth and an outer peripheral surface of the second bell mouth, and an inner portion of the second bell mouth Divided into a second suction port to the second suction flow path formed surrounded by the peripheral surface,
The first suction port has a second opening end of the second bell mouth having a second bending portion along the stream line from a first opening end of the first bell mouth having a first bending portion along the stream line. It is set by the step interval formed by approaching the wall surface.

Therefore, in the vehicle air conditioner of the present invention, among the fan suction winds whose flow mainstream direction is orthogonal to the fan rotation axis, the winds near the scroll casing are From the step interval of the two bell mouths, the first suction port passes and is led to a first suction channel formed by being surrounded by the inner peripheral surface of the first bell mouth and the outer peripheral surface of the second bell mouth. In addition, the wind near the wall surface passes through the second suction port from the gap between the second opening end of the second bell mouth and the wall surface, and is formed by being surrounded by the inner peripheral surface of the second bell mouth. Guided to the suction channel.
That is, a part of the wind sucked from the direction orthogonal to the fan rotation axis is received at the step interval between the first bell mouth and the second bell mouth, and the first bent portion and the second bent portion along the stream line The main flow direction can be smoothly changed to the fan rotation axis direction. For this reason, the effective area of the suction air is expanded to the outer peripheral area of the suction opening area, and the suction ventilation resistance is lowered with this expansion. As the suction ventilation resistance decreases, the disturbance of streamlines in the suction region is reduced, and the generation of suction sound (go sound) is also suppressed.
As a result, although the main flow direction of the fan suction air is perpendicular to the fan rotation axis, the suction ventilation resistance can be lowered and the generation of the suction noise can be suppressed.

  Hereinafter, the best mode for realizing a vehicle air conditioner of the present invention will be described based on Example 1 shown in the drawings.

First, the configuration will be described.
FIG. 1 is a schematic side view showing a one-box type vehicle equipped with a rear seat air conditioner (an example of a vehicle air conditioner) according to the first embodiment. FIG. 2 is an overall perspective view illustrating the rear seat air conditioner according to the first embodiment.

  As shown in FIG. 1 and FIG. 2, the one-seat type vehicle equipped with the rear seat air conditioner Rr.C / U of Example 1 includes the front seat air conditioner Fr.A / U and the instrument panel 1. A steering wheel 2, a vehicle interior space 3, a floor 4, a ceiling 5, a front seat 6, a second row seat 7, and a third row seat 8.

  The front seat air conditioner Fr.A / U is disposed inside the instrument panel 1 and cools the occupant of the front seat 6 and also heats the seats 6, 7, and 8.

  The rear seat air conditioner Rr.C / U is built in and disposed on one side of the rear side of the vehicle, and cools the second row seat 7 and the third row seat 8.

  As shown in FIGS. 1 and 2, the rear seat air conditioner Rr.C / U of Embodiment 1 includes a passenger compartment air inlet 9, a blower unit 10, a rear cooler unit 11, and a rear cool air duct 12. The second row occupant cold air outlets 13 and 13 (cold air outlet) and the third row occupant cold air outlets 14 and 14 (cold air outlet) are provided.

  As shown in FIG. 1, the vehicle interior air inlet 9 is set at a lower position on one side of the rear of the vehicle. When the rear seat air conditioner Rr.C / U is activated, Inhale.

  As shown in FIGS. 1 and 2, a rear cooler unit 11 is integrally connected to the blower unit 10 on the vehicle rear side. A rear cool air duct 12 is connected to the upper opening position of the rear cooler unit 11.

  As shown in FIG. 2, the rear cold air duct 12 is arranged so as not to be exposed to the vehicle interior along the panel space of the vehicle body, and includes a vertical duct portion 12a, a right side duct portion 12b, a cross It has a duct portion 12c and a left side portion duct 12d.

  In the right side duct portion 12b and the left side portion duct 12d, a cold air outlet 13 for the second row occupant for blowing cold air toward the seat occupant of the second row seat 7 and a seat occupant of the third row seat 8 are provided. The third row occupant cold air outlets 14 for blowing cold air toward each other are provided.

  FIG. 3 is a plan view showing a state in which the blower unit and the rear cooler unit of the rear seat air conditioner of Embodiment 1 are arranged in the panel space of the outer panel and the inner panel. 4 is a cross-sectional view taken along line AA of FIG. 3 showing the internal structure of the blower unit and the rear cooler unit of the air conditioner for the rear seat according to the first embodiment.

  As shown in FIGS. 3 and 4, the rear seat air conditioner Rr.C / U of Example 1 includes a blower unit 10, a rear cooler unit 11, an outer panel 15, an inner panel 16, and a panel space 17. A scroll casing 18, a unit case 19, a blower fan 20, an evaporator 21, a fan motor 22, a motor flange 23, a main suction port 24, and a sub suction port 25 (suction port). Yes.

  As shown in FIG. 3, the blower unit 10 and the rear cooler unit 11 include a panel space 17 formed by an outer panel 15 that is an exterior plate of a vehicle and an inner panel 16 that has a side lining that is an interior plate of a passenger compartment. Is placed inside.

  As shown in FIG. 3, the scroll casing 18 and the unit case 19 are integrally formed by combining two parts in a direction perpendicular to the fan rotation axis CL. As shown in FIG. 4, a blower fan 20 is disposed inside the scroll casing 18, and an evaporator 21 is inclined inside the unit case 19.

  As shown in FIG. 3, the scroll casing 18 has an auxiliary suction port 25 on the side of the motor flange 23 that holds the fan motor 22 added to the main suction port 24 on the side where the fan motor 22 does not exist. . The main suction port 24 is arranged in parallel at a position close to the outer panel 15 of the vehicle, and uses the panel inner surface 15a of the outer panel 15 as a wall surface. Further, the sub suction port 25 is arranged in parallel at a position close to the inner panel 16 in the vehicle interior, and the panel outer surface 16a of the inner panel 16 is used as a wall surface.

  As shown in FIG. 3, the main suction port 24 has a main flow direction Dm of the fan suction air in a direction perpendicular to the fan rotation axis CL by the panel inner surface 15a of the outer panel 15 arranged close to the main suction port 24. As shown in FIG. 3, the sub suction port 25 has a main flow direction Ds of the fan suction air in a direction orthogonal to the fan rotation axis CL due to the panel outer surface 16 a of the inner panel 16 disposed close to the sub suction port 25.

  5 is a cross-sectional view taken along the line BB of FIG. 4 showing the structure of the blower unit in the rear seat air conditioner of the first embodiment. 6 is an enlarged cross-sectional view of a portion C in FIG. 5 illustrating a detailed structure of the first bell mouth and the second bell mouth of the blower unit in the rear seat air conditioner of the first embodiment.

  As shown in FIGS. 5 and 6, the blower unit 10 according to the first embodiment includes a scroll casing 18, a blower fan 20, a fan motor 22, a motor flange 23, a main suction port 24, and a sub suction port 25. The main suction bell mouth 26, the wind introduction plate 27, the first bell mouth 28, the second bell mouth 29, the first suction port 30, the second suction port 31, and the first suction flow path 32, A second suction channel 33, a first radial rib 34, and a second radial rib 35 are provided.

  As shown in FIG. 5, the blower fan 20 is configured by arranging a large number of blades 20a in a ring shape and connecting the large number of blades 20a in a ring shape by ring portions 20b and 20c formed at both ends in the axial direction. (See FIG. 4). As shown in FIG. 5, the blower fan 20 divides the blades 20 a arranged in the axial direction into a blade portion that sucks air from the main suction port 24 side and a blade portion that sucks air from the auxiliary suction port 25 side. It has a partition plate portion 20d. Further, the central portion of the partition plate portion 20d has a bulging portion 20e that bulges toward the main suction port 24, and the motor shaft 22a of the fan motor 22 mounted in the motor flange 23 is connected to the top of the bulging portion 20e. is doing. The ring portion 20b is set to overlap the main suction bell mouth 26 in the direction of the fan rotation axis CL. The ring portion 20c is set to overlap the first bell mouth 28 in the direction of the fan rotation axis CL.

  As shown in FIG. 5, an annular main suction bell mouth 26 is disposed at the position of the main suction port 24 of the scroll casing 18, and a wind introduction plate 27 that guides the suction air to the main suction port 24 is provided. The main suction bell mouth 26 and the wind introduction plate 27 are formed integrally with the scroll casing 18.

  An annular first bell mouth 28 is disposed at the position of the auxiliary suction port 25 of the scroll casing 18, and an annular second bell mouth 29 having a coaxial center is disposed at an inner peripheral side position of the first bell mouth 28. Yes. The first bell mouth 28 and the second bell mouth 29 are integrally formed with the motor flange 23 by a plurality of first radial ribs 34 and second radial ribs 35 set in the radial direction. Further, the first bell mouth 28 is formed with an annular recess 28a, and is attached to the annular protrusion 18a at the opening position of the sub suction port 25 of the scroll casing 18 in an uneven engagement state.

  As shown in FIGS. 5 and 6, the auxiliary suction port 25 is connected to the first suction flow path 32 formed by being surrounded by the inner peripheral surface of the first bell mouth 28 and the outer peripheral surface of the second bell mouth 29. It is divided into a first suction port 30 and a second suction port 31 to a second suction channel 33 formed by being surrounded by the inner peripheral surface of the second bell mouth 29 and the outer peripheral surface of the motor flange 23. .

  As shown in FIGS. 5 and 6, the first suction port 30 has a second bent portion along the stream line from the first opening end 28 c of the first bell mouth 28 having the first bent portion 28 b along the stream line. The second opening end 29c of the second bell mouth 29 having 29b is set by the step distance H formed by bringing it close to the panel outer surface 16a (see FIG. 3) of the inner panel 16.

  As shown in FIG. 6, the first suction port 30 and the first suction channel 32 have an inner peripheral diameter of the first bell mouth 28 larger than an outer peripheral diameter of the second bell mouth 29 in addition to the step interval H. By giving the lateral dimension difference L and making the curved surface shape the curvature radius R1 of the first bending portion 28b larger than the curvature radius R2 of the second bending portion 29b, gradually from the opening area SA of the first suction port 30. The area is narrowed to reach the channel area SB (> SA) of the first suction channel 32.

  As shown in FIGS. 5 and 6, the first suction flow path 32 is arranged so as to coincide with the blade end surface suction region sandwiched between the blade outer diameter and blade inner diameter of the blower fan 20. As shown in FIGS. 5 and 6, the second suction flow path 33 is arranged so as to coincide with a blade inlet suction region formed inside the blade inner diameter of the blower fan 20.

Next, the operation will be described.
First, the “problem of the rear seat air conditioner” will be described, and then the actions of the vehicle air conditioner of the first embodiment will be described as “the airflow resistance reducing action by suction on both sides” and “the airflow resistance reducing action by double bell mouth” ”And“ Analysis of the difference in ventilation resistance depending on the presence / absence of a bent portion of the motor flange ”.

[Problems of rear seat air conditioner]
FIG. 7 is an operation explanatory view showing a blower suction operation in a conventional rear seat air conditioner arranged in a space between the vehicle outer plate and the side lining.

  For example, as shown in FIG. 7, the conventional rear seat air conditioner Rr.UNIT is disposed in a narrow space formed by a vehicle outer plate and a side lining which is an interior plate of a passenger compartment. In the rear seat air conditioner Rr.UNIT, when the blower fan is driven to rotate, the air is sucked from the suction port in which the bell mouth of the blower unit is set, and the wind is sent out to the rear cooler unit in which the evaporator is arranged.

  However, due to the inner surface of the vehicle outer plate disposed close to the suction port, the main flow direction of the fan suction air is a direction (lateral direction) orthogonal to the fan rotation axis. For this reason, of the suction opening area, only the central portion where the suction negative pressure is high is the effective area of the suction wind that bends the main flow direction and introduces the wind.

  Therefore, for example, as in the case of a blower unit of a front seat air conditioner, the main flow direction of the fan suction air is the fan rotation axis direction, and the suction air is larger than the suction opening effective area. The effective area of is reduced. As described above, as the effective area of the suction air is reduced, the suction ventilation resistance is increased, and the flow of the wind is disturbed in the suction region to generate the suction sound (go sound).

  This suction sound is, for example, in the summer and when the rear seat is being cooled by the rear seat air conditioner Rr.UNIT, if the vehicle stops, it becomes annoying noise for the rear seat occupant, and how to reduce this suction sound is solved. It has become a challenge.

On the other hand, the present inventor paid attention to the fact that the suction sound is effectively reduced by lowering the suction ventilation resistance, and the conventional one-side suction structure is changed to the both-side suction structure and newly added. A double bell mouth structure is adopted as a suction structure from the motor flange side.
Hereinafter, the airflow resistance reducing action by suction on both sides and the airflow resistance reducing action by the double bell mouth will be described.

[Airflow resistance reduction effect by suction on both sides]
FIG. 8 is an operation explanatory view showing the blower suction operation in the rear seat air conditioner of Embodiment 1 in which the blower unit and the rear cooler unit are arranged in the panel space of the outer panel and the inner panel.

  In the rear seat air conditioner Rr.C / U of the first embodiment, the blower unit 10 and the rear cooler unit 11 are arranged in a narrow panel space 17 formed by an outer panel 15 and an inner panel 16, as shown in FIG. . Then, an auxiliary suction port 25 on the motor flange 23 side that holds the fan motor 22 is additionally set in the main suction port 24 of the scroll casing 18 on the side where the fan motor 22 does not exist. Accordingly, the blower fan 20 has a partition plate portion 20d that divides a plurality of blades 20a arranged in the axial direction into a blade portion that sucks air from the main suction port 24 side and a blade portion that sucks air from the sub suction port 25 side. Provided. In other words, air is sucked from the main suction port 24 and the sub suction port 25 on both sides of the scroll casing 18.

  For this reason, in the rear seat air conditioner Rr.C / U of the first embodiment, as indicated by the upper arrow in FIG. 8, on the main suction port 24 side, the main flow direction Dm of the fan suction air is the fan rotation axis CL. Is changed from the direction orthogonal to the direction of the fan rotation axis CL (the downward direction in FIG. 8) to be sucked into the blower fan 20. At the same time, as indicated by the lower arrow in FIG. 8, at the sub suction port 25, the flow direction Ds of the fan suction air flows from the direction perpendicular to the fan rotation axis CL to the direction of the fan rotation axis CL (upward direction in FIG. 8). It is changed to be sucked into the blower fan 20.

  Accordingly, the blower suction action from both sides of the main suction port 24 and the sub suction port 25 is shown. Compared with the one-side suction structure as in the conventional device, the suction of the blower from the sub suction port 25 is added. Ventilation resistance can be reduced.

[Airflow resistance reduction by double bell mouth]
FIG. 9 is an operation explanatory diagram illustrating the blower suction operation on the side of the sub suction port having the double bell mouth in the rear seat air conditioner of the first embodiment.

  The rear seat air conditioner Rr.C / U of Example 1 has a double bell mouth structure in which an annular first bell mouth 28 and second bell mouth 29 are arranged at the position of the sub suction port 25 of the scroll casing 18. . Then, the sub suction port 25 is divided into a first suction port 30 to the first suction flow channel 32 and a second suction port 31 to the second suction flow channel 33, and the first suction port 30 is The distance between the first opening end 28 c of the first bell mouth 28 and the second opening end 29 c of the second bell mouth 29 is set by a step distance H.

  For this reason, in the sub suction port 25, the fan suction air in which the main flow direction Ds is in the direction perpendicular to the fan rotation axis CL, the wind closer to the scroll casing 18 is the first bell mouth 28 and the second air. From the step interval H of the bell mouth 29, the first suction port 30 passes, and the first suction channel 32 formed by being surrounded by the inner peripheral surface of the first bell mouth 28 and the outer peripheral surface of the second bell mouth 29. Led. Further, the wind on the side of the inner panel 16 close to the panel outer surface 16a passes through the second suction port 31 from the gap between the second opening end 29c of the second bell mouth 29 and the panel outer surface 16a, and the second bell mouth 29 The air is guided to a second suction flow path 33 formed by being surrounded by the inner peripheral surface and the outer peripheral surface of the motor flange 23.

  That is, a part of the wind sucked from the direction orthogonal to the fan rotation axis CL is received at the step distance H between the first bell mouth 28 and the second bell mouth 29, and the first bent portion 28b along the streamline and the first The main flow direction is smoothly changed to the fan rotation axis direction CL by the two bent portions 29 b and guided to the first suction flow path 32. The other part of the wind sucked from the direction orthogonal to the fan rotation axis CL is received by the step between the second bell mouth 29 and the motor flange 23, and the second bent portion along the streamline of the second bell mouth 29. The main flow direction is smoothly changed to the fan rotation axis direction CL by 29 b and guided to the second suction flow path 33.

  For this reason, the suction opening area of the sub suction port 25 is utilized as the effective area of the suction air, and the suction ventilation resistance decreases as the effective area of the suction air increases. As the suction ventilation resistance decreases, the disturbance of streamlines in the suction region of the sub suction port 25 is reduced, and the generation of suction sound (go sound) is suppressed.

  Further, in the rear seat air conditioner Rr. C / U of Example 1, in addition to the step distance H, the inner diameter of the first bell mouth 28 is made larger than the outer diameter of the second bell mouth 29 to increase the lateral dimension difference. L is set so that the area gradually decreases from the opening area SA of the first suction port 30 to reach the flow path area SB (> SA) of the first suction flow path 32.

  Accordingly, the suction air guided from the first suction port 30 to the first suction flow path 32 is sucked into the blower fan 20 while increasing the flow velocity by the nozzle action. Further, the suction air guided from the second suction port 31 to the second suction flow path 33 is drawn into the blower fan 20 in a smooth streamline without being separated by the second bending portion 29b.

  In addition, the first suction flow path 32 is arranged so as to coincide with the blade end surface suction area sandwiched between the blade outer diameter and the blade inner diameter of the blower fan 20, and the second suction flow path 33 is disposed inside the blade inner diameter of the blower fan 20. It is arranged to match the blade inlet suction area formed in.

  Therefore, the suction air guided from the first suction flow path 32 to the blade end surface suction region of the blower fan 20 does not generate a back flow even when subjected to load resistance by the evaporator 21 or the like, and the blower fan 20 is ordered while increasing the flow velocity of the wind. Is sucked into the blade tip suction area. Further, the suction air guided from the second suction flow path 33 to the blade inlet suction area of the blower fan 20 changes the flow direction while drawing a smooth streamline in the second suction flow path 33, and the blades of the blower fan 20. Sucked into the inlet suction area.

[Analysis of the difference in ventilation resistance due to the presence or absence of a motor flange bent part]
FIG. 10 is an operation explanatory diagram showing a blower suction operation when it is assumed that the second bell mouth has a structure without a bent portion in the rear seat air conditioner of the first embodiment. FIG. 11 is a diagram showing a measurement system used for CAE analysis of ventilation resistance depending on the presence or absence of a bent portion of the motor flange. FIG. 12 shows the CAE analysis result of the airflow resistance with and without the bending portion of the motor flange, (a) shows the flow velocity distribution characteristic in the case of the rib without the bending portion, and (b) is the second bell mouth with the bending portion. The flow velocity distribution characteristics in the case of. FIG. 13 shows the actual air volume and noise when the fan motor voltage is changed for a conventional flange (one-side suction structure), a rib without a bent part (comparative example structure), and a second bell mouth with a bent part (example structure). It is a figure which shows a mounting test result table | surface. FIG. 14 is a diagram illustrating a comparison characteristic of noise with respect to the air volume for a second bell mouth with a conventional flange, a rib without a bent portion, and a bent portion.

  A CAE analysis of the airflow resistance by the rib without the bent portion and the second bell mouth 29 with the bent portion (CAE is an abbreviation for Computer Aided Engineering, and CAE analysis means computer-assisted analysis) will be described.

  First, as shown in FIG. 10, in the case of a rib without a bent portion, the wind from the oblique direction reaching the tip end α of the rib causes the separation of the wind in the direction from the tip α to the second suction flow path. The effective area of the suction air in the second suction channel is reduced, the suction ventilation resistance is increased, and the suction sound is increased. In order to prove this point, the airflow resistance due to the difference in the shape of the motor flange (the presence or absence of a bent portion) was measured by CAE analysis.

First, as shown in FIG. 11, an analysis model similar to the in-vehicle layout was created as analysis conditions, and wind was sent from eight directions of the inlet assuming actual wind flow. The measurement conditions are
Air volume: 252m3 / h
Inlet (INLET): Dummy straight pipe 500mm
Outlet (OUTLET): dummy straight tube 1000mm
And

  As a result of the CAE analysis, the space in the fan rotation axis direction is narrow, and the suction air flow from the circumferential direction (wide space) becomes the mainstream due to the suction from there. When the motor flange shape is a rib without a bent portion, as shown in the flow velocity distribution characteristic of the E portion in FIG. 12A, wind hits the rib without the bent portion, and the flow velocity is increased. On the other hand, when the motor flange shape is the second bell mouth 29 with the bent portion, the second bell mouth 29 with the bent portion is bent by the second bell mouth 29 with the bent portion as shown in the flow velocity distribution characteristic of the F portion in FIG. Compared to ribs without parts, the increase in flow velocity is suppressed. The fact that the increase in the flow velocity is suppressed means that the ventilation resistance is lowered.

  Incidentally, the analysis result of the ventilation resistance analysis value (Pa) shows that in the case of the rib without the bent portion, the total pressure is 46.9 Pa and the static pressure is 45.1 Pa, whereas the second bell mouth 29 with the bent portion is provided. In this case, the total pressure was 44.9 Pa and the static pressure was 43.1 Pa. That is, it was confirmed that the analysis value of the airflow resistance was 2.0 Pa for both the total pressure and the static pressure.

  Next, using a one-box type actual vehicle, a microphone is set at the center of the third row seat, and a conventional bell (one-side suction structure), a rib without a bent part (comparative example structure), a second bell with a bent part The mouse (example structure) was subjected to a noise test while changing the air volume.

  As a result, the actual vehicle mounting test results shown in FIG. 13 can be obtained. As is clear from FIG. 14, the rib characteristics I without the bent portion, which is the suction structure on both sides, as compared with the conventional flange characteristics G, which is the suction structure on one side. The second bellmouth characteristic J with the bent portion was able to obtain better results for both noise and air volume. Furthermore, when the rib characteristic I without a bent part and the second bell mouth characteristic J with a bent part, which are both-side suction structures, are compared, the second bell mouth characteristic J with a bent part is compared with the same air volume. It has been confirmed that the actual vehicle noise can be reduced by having a noise reduction allowance of about 2 dBA, that is, by setting with a bend.

Next, the effect will be described.
In the vehicle air conditioner of the first embodiment, the effects listed below can be obtained.

  (1) A wall surface (including a scroll casing 18, a suction port (sub-suction port 25), a blower fan 20, and a blower unit 10 having a fan motor 22, which is disposed close to the suction port (sub-suction port 25). In the vehicle air conditioner (rear seat air conditioner Rr.C / U) in which the main flow direction Ds of the fan suction air is perpendicular to the fan rotation axis CL, the panel casing 16a) sucks the scroll casing 18 An annular first bell mouth 28 is arranged at the opening position, and an annular second bell mouth 29 is arranged at the inner peripheral side of the first bell mouth 28, and the suction port (sub suction port 25) is arranged. The first suction port 30 to the first suction channel 32 formed by being surrounded by the inner peripheral surface of the first bell mouth 28 and the outer peripheral surface of the second bell mouth 29, and the inner peripheral surface of the second bell mouth 29 In The first suction port 30 is divided into a second suction port 31 to the second suction flow path 33 that is rarely formed, and the first suction port 30 has a first bent portion 28b along a streamline. The step distance H was set by bringing the second opening end 29c of the second bell mouth 29 having the second bent portion 29b along the streamline closer to the wall surface than the opening end 28c. For this reason, although the main flow direction Ds of the flow of the fan suction air is perpendicular to the fan rotation axis CL, it is possible to reduce the suction ventilation resistance and suppress the generation of the suction sound.

  (2) In addition to the step gap H, the first suction port 30 and the first suction flow path 32 have a larger inner peripheral diameter of the first bell mouth 28 than the outer peripheral diameter of the second bell mouth 29. An opening area SA of the first suction port 30 is provided by giving a dimensional difference L and a curved shape in which the curvature radius R1 of the first bending portion 28b is larger than the curvature radius R2 of the second bending portion 29b. Then, the area was gradually narrowed to reach the channel area SB (> SA) of the first suction channel 32. Therefore, the intake air can be guided from the first suction port 30 to the first suction flow channel 32 while increasing the flow velocity, and the flow from the second suction port 31 to the second suction flow channel 33 can be smoothly performed without separation. You can draw a line to guide the intake air.

  (3) The blower fan 20 is configured by arranging a large number of blades 20a in an annular shape, and the first suction flow path 32 is in a blade end surface suction region sandwiched between the blade outer diameter and blade inner diameter of the blower fan 20. The second suction flow path 33 is arranged to match a blade inlet suction region formed inside the blade inner diameter of the blower fan 20. For this reason, the intake air can be guided in an orderly manner while increasing the flow velocity of the wind from the first suction channel 32 to the blade end surface suction region of the blower fan 20, and the blade inlet suction of the blower fan 20 from the second suction channel 33. While drawing smooth streamlines in the area, the direction of flow can be changed to guide the intake air.

  (4) In the scroll casing 18, a sub suction port 25 on the motor flange 23 side for holding the fan motor 22 is additionally set to the main suction port 24 on the side where the fan motor 22 does not exist. A partition plate portion 20d that divides a plurality of wings 20a arranged in the axial direction into a wing portion that sucks air from the main suction port 24 side and a wing portion that sucks air from the sub suction port 25 side; The suction port 30 and the second suction port 31 are set to the sub suction port 25 on the motor flange 23 side that holds the fan motor 22. For this reason, the suction ventilation resistance is reduced by the blower suction action from both sides of the main suction port 24 and the sub suction port 25, and better performance in both noise and air volume can be obtained compared to the one-side suction structure.

  (5) The first bell mouth 28 and the second bell mouth 29 are integrally formed at an outer peripheral position of the motor flange 23 via a first radial rib 34 and a second radial rib 35, and The suction port 31 sucks air into a second suction passage 33 formed by being surrounded by the inner peripheral surface of the second bell mouth 29 and the outer peripheral surface of the motor flange 23. Therefore, the mounting strength of the motor flange 23 can be increased by the first bell mouth 28 and the second bell mouth 29 formed integrally with the first radial rib 34 and the second radial rib 35, and the motor The outer peripheral surface of the flange 23 becomes a member that applies the suction air from the lateral direction, and the air suction property to the second suction flow path 33 can be enhanced.

  (6) The blower unit 10 is disposed in a panel space 17 formed by an outer panel 15 that is an exterior plate of a vehicle and an inner panel 16 that is an interior plate of a vehicle compartment. The outer panel 15 is arranged in parallel to the adjacent position, the inner surface 15a of the outer panel 15 is a wall surface, and the auxiliary suction port 25 is arranged in parallel to the adjacent position of the inner panel 16 in the vehicle interior. The panel casing 16 has a panel outer surface 16a as a wall surface, and the scroll casing 18 is connected to a unit case 19 of the rear cooler unit 11 in which an evaporator 21 is disposed. It connected to the rear cold air duct 12 which has the cold air blowing ports 13 and 14 which blow off cold air. For this reason, during rear seat cooling, noise radiated to the rear seat occupant from the rear seat air conditioner Rr.C / U arranged in the panel space 17 on one side of the vehicle is reduced, and the rear seat air conditioner Rr. The comfort and quietness of the vehicle equipped with C / U can be secured.

  As mentioned above, although the vehicle air conditioner of this invention has been demonstrated based on Example 1, it is not restricted to this Example 1 about a concrete structure, The invention which concerns on each claim of a claim Design changes and additions are allowed without departing from the gist.

  In the first embodiment, the second bell mouth is set only on the side of the auxiliary suction port having the motor flange. However, considering the narrowness of the component clearance between the main suction port side and the vehicle outer plate, FIG. As shown by the dotted line, the effect of reducing ventilation resistance can be obtained by setting the same second bell mouth.

  In Example 1, the example of the both-sides suction structure was shown. However, an example in which a double bell mouth is adopted for the one-side suction structure is also possible.

  In the first embodiment, the application example to the rear seat air conditioner is shown, but the present invention is also applied to other vehicle air conditioners such as a front seat air conditioner, an air purifier, and a rear seat air conditioner with an air purifying function. Can be applied. In short, the present invention can be applied to any vehicle air conditioner in which the main flow direction of the fan suction air is perpendicular to the fan rotation axis due to the wall surface arranged close to the suction port.

1 is a schematic side view showing a one-box type vehicle equipped with a rear seat air conditioner (an example of a vehicle air conditioner) according to Embodiment 1; FIG. It is a whole perspective view which shows the air conditioner for backseats of Example 1. FIG. It is a top view which shows the state which has arrange | positioned the blower unit and rear-cooler unit of the air conditioner for backseats of Example 1 in the panel space of an outer panel and an inner panel. FIG. 4 is a cross-sectional view taken along the line AA of FIG. 3 showing the internal structure of the blower unit and the rear cooler unit of the rear seat air conditioner of Embodiment 1. FIG. 5 is a cross-sectional view taken along line B-B in FIG. FIG. 6 is an enlarged cross-sectional view of a portion C in FIG. 5 illustrating a detailed structure of the first bell mouth and the second bell mouth of the blower unit in the rear seat air conditioner of the first embodiment. It is an action explanatory view showing blower suction action in the conventional rear seat air conditioner arranged in the space between the vehicle outer plate and the side lining. It is an operation explanatory view showing a blower suction operation in the rear seat air conditioner of Example 1 in which the blower unit and the rear cooler unit are arranged in the panel space of the outer panel and the inner panel. It is effect | action explanatory drawing which shows the blower suction effect | action by the side of a sub suction port which has a double bell mouth in the air conditioner for rear seats of Example 1. FIG. It is effect | action explanatory drawing which shows the blower suction effect | action when it assumes that the 2nd bellmouth is a structure without a bending part in the air conditioner for backseats of Example 1. FIG. It is a figure which shows the measurement system used for carrying out CAE analysis of the ventilation resistance by the presence or absence of the bending part of a motor flange. The CAE analysis result of the ventilation resistance with and without the motor flange is shown. (A) shows the flow velocity distribution characteristics in the case of the rib without the bent portion. (B) shows the flow velocity in the case of the second bell mouth with the bent portion. Distribution characteristics are shown. Table of actual vehicle mounting test results of air volume and noise when the fan motor voltage is changed for a conventional flange (one-side suction structure), rib without a bent part (comparative example structure), and a second bell mouth with a bent part (example structure) FIG. It is a figure which shows the comparison characteristic of the noise with respect to an air volume about the 2nd bellmouth with a rib and bending part with the conventional flange and a bending part.

Explanation of symbols

Rr.C / U Rear seat air conditioner (vehicle air conditioner)
Fr.A / U Front-seat air conditioner 1 Instrument panel 2 Handle 3 Car compartment space 4 Floor 5 Ceiling 6 Front seat 7 Second-row seat 8 Third-row seat 9 Car interior air inlet 10 Blower unit 11 Rear cooler Unit 12 Rear cold air duct 13 Second row passenger cold air outlet (cold air outlet)
14 Third row occupant cold air outlet (cold air outlet)
15 Outer Panel 16 Inner Panel 17 Panel Space 18 Scroll Casing 19 Unit Case 20 Blower Fan 21 Evaporator 22 Fan Motor 23 Motor Flange 24 Main Suction Port 25 Sub Suction Port (Suction Port)
26 Main suction bell mouth 27 Wind introduction plate 28 First bell mouth 29 Second bell mouth 30 First suction port 31 Second suction port 32 First suction channel 33 Second suction channel 34 First radial rib 35 Second Radial ribs

Claims (6)

A wall surface disposed in the vicinity of the suction port includes a scroll casing, a suction port, a blower fan, and a blower unit having a fan motor, and the main flow direction of the fan suction air is perpendicular to the fan rotation axis. In vehicle air conditioners,
An annular first bell mouth is disposed at the suction opening position of the scroll casing, and an annular second bell mouth by a coaxial center is disposed at an inner peripheral side position of the first bell mouth,
The suction port includes a first suction port into a first suction channel formed by being surrounded by an inner peripheral surface of the first bell mouth and an outer peripheral surface of the second bell mouth, and an inner portion of the second bell mouth Divided into a second suction port to the second suction flow path formed surrounded by the peripheral surface,
The first suction port has a second opening end of the second bell mouth having a second bending portion along the stream line from a first opening end of the first bell mouth having a first bending portion along the stream line. A vehicle air conditioner set by a step interval formed by approaching the wall surface. In the vehicle air conditioner according to claim 1,
In addition to the step gap, the first suction port and the first suction channel have a lateral dimension difference by making the inner diameter of the first bell mouth larger than the outer diameter of the second bell mouth. The first suction flow path is formed by gradually reducing the area from the opening area of the first suction port by forming a curved shape in which the curvature radius of the first bent portion is larger than the curvature radius of the second bent portion. A vehicle air conditioner characterized in that it is set to reach the flow path area of the vehicle. In the vehicle air conditioner according to claim 2,
The blower fan is configured by arranging a large number of blades in an annular shape,
The first suction flow path is arranged to coincide with a blade end surface suction region sandwiched between a blade outer diameter and a blade inner diameter of the blower fan,
The vehicle air conditioner is characterized in that the second suction flow path is arranged so as to coincide with a blade inlet suction region formed inside a blade inner diameter of the blower fan. In the vehicle air conditioner according to any one of claims 1 to 3,
The scroll casing additionally sets a sub-suction port on the motor flange side that holds the fan motor to the main suction port on the side where the fan motor does not exist,
The blower fan has a partition plate portion that divides a plurality of blades arranged in the axial direction into a blade portion that sucks air from the main suction port side and a blade portion that sucks air from the sub suction port side,
The vehicle air conditioner characterized in that the first suction port and the second suction port are set as auxiliary suction ports on the motor flange side that holds the fan motor. In the vehicle air conditioner according to claim 4,
The first bell mouth and the second bell mouth are integrally formed at an outer peripheral position of the motor flange via a first radial rib and a second radial rib,
The vehicle air conditioner, wherein the second suction port sucks air into a second suction passage formed by being surrounded by an inner peripheral surface of the second bell mouth and an outer peripheral surface of the motor flange. In the vehicle air conditioner according to claim 4 or 5,
The blower unit is disposed in a panel space formed by an outer panel that is an exterior plate of a vehicle and an inner panel that is an interior plate of a passenger compartment,
The main suction port is arranged in parallel at a position close to the outer panel of the vehicle, and the inner surface of the outer panel is a wall surface.
The auxiliary suction port is arranged in parallel at a position close to the inner panel in the vehicle interior, and the outer surface of the inner panel is a wall surface,
The scroll casing is connected to a unit case of a rear cooler unit in which an evaporator is disposed,
The vehicle unit is characterized in that the unit case is connected to a rear cold air duct having a cold air outlet for blowing cool air toward a rear seat passenger in the vehicle interior.