JP6098504B2 - Air conditioner for vehicles - Google Patents

Description

  The present invention relates to a vehicle air conditioner.

  Conventionally, in a blower, a centrifugal multiblade fan having a plurality of blades around a rotation shaft of an electric motor, a suction port that houses the centrifugal multiblade fan and opens on one end side in the axial direction of the rotation shaft, Some include a scroll casing having a side wall forming an air passage formed in a spiral shape from a winding start portion to a winding end portion (see, for example, Patent Document 1).

  In this, the scroll radius of the scroll casing changes in the axial direction from the winding start portion to the winding end portion. The scroll radius is a dimension between the side wall and the rotation axis. The maximum radius R of the scroll radius in the axial direction is set on the other axial end side of the side wall of the scroll casing. On the other hand, the minimum radius r of the scroll radius in the axial direction is set on one end side in the axial direction of the scroll casing.

JP 2007-239538 A

  This inventor arrange | positions the air blower of the said patent document 1 on the upper side of the heat exchanger for cooling, blows off air from the air blower to the vehicle front side of the heat exchanger for cooling, and heat-discharges this blown-out air Regarding the air conditioner for vehicles that cools and blows out to the rear of the vehicle, we studied cooling the electric motor with air blown from the fan of the blower.

  For example, when using the motor flange 5 constituting the air passage 5b that takes in the air blown out from the fan of the blower 1 through the air intake 3 and distributes it to the electric motor 4 side, the following problems occur. (See FIGS. 7 and 8).

  In the blower 1 of Patent Document 1, as described above, the maximum radius R of the scroll radius is set on the other side in the axial direction (that is, on the side opposite to the suction port). Along with this, the dimension between the winding start side of the side wall and the rotating shaft increases. In addition to this, the air intake 3 (see FIG. 7) is arranged below the winding start portion of the side wall 2 a of the scroll casing 2. Thereby, the dimension between a rotating shaft and the air intake 3 becomes large. Along with this, the length of the air passage 5b of the motor flange 5 becomes longer.

  Here, if the air intake port 3 and the motor flange 5 are arranged on the upper side of the cooling heat exchanger, the cooling heat exchanger interferes with the air intake port 3 and the motor flange 5, and the vertical direction of the vehicle air conditioner is increased. The dimension increases. Therefore, if the cooling heat exchanger is arranged at the rear of the vehicle with respect to the motor flange 5 while avoiding interference of the cooling heat exchanger with the air intake 3 and the motor flange 5, the vehicle longitudinal direction of the vehicle air conditioner The dimensions of the increase. That is, the dimension in the air flow direction of the vehicle air conditioner increases. The air flow direction is the flow direction of air passing through the cooling heat exchanger.

  On the other hand, as shown in FIG. 8, the air passage 5 b of the motor flange 5 is shortened to avoid the interference of the cooling heat exchanger, and the air sucked from the air intake port 3 is taken into the duct portion of the motor flange 5. It is also conceivable to configure the air passage 3a leading to the motor cooling port 5c of 5a below the bottom wall 2b of the scroll casing. The duct portion 5 a forms the air passage 5 b in the motor flange 5.

  For example, a U-shaped duct portion 2 c is provided on the lower side of the bottom wall 2 b of the scroll casing 2 in the drawing. An air passage 3a is formed between the duct portion 2c and the bottom wall 2b. In this case, a part 2d (a part surrounded by a chain line in the figure) of the bottom wall 2b of the scroll casing 2 has a shape that covers the duct part 2c from the upper side in the figure. That is, a part 2d and the duct portion 2c of the bottom wall 2b overlap each other in the vertical direction in the figure.

  Therefore, in the scroll casing 2, the resin part including the bottom wall 2b and the duct portion 2c cannot be integrally formed by injection molding. Therefore, it is necessary to form part 2d and duct part 2c of bottom wall 2b independently, and it is necessary to add parts which constitute a casing.

  An object of this invention is to provide the vehicle air conditioner which can guide the air which blows off from a fan to the electric motor side of a fan, without adding the components which comprise a casing in view of the said point.

In order to achieve the above object, the invention according to claim 1 includes a blower (10) and a heat exchanger (50) disposed below the blower,
The blower has a plurality of blades (13) arranged in a circumferential direction around the rotation shaft (12a) of the electric motor, and sucks from one side in the axial direction of the rotation shaft as the rotation shaft rotates. The fan (11) that blows air outward in the radial direction of the rotating shaft, and the fan is housed and formed in a spiral shape around the rotating shaft from the winding start portion (29) to the winding end portion (32). A scroll casing (26) having a side wall (23) that forms an air passage (31) through which blown air is circulated, and
The heat exchanger exchanges heat with the air that has passed through the air passage.
The dimension between the rotating shaft and the side wall changes in the axial direction from the winding start part to the winding end part, and the smallest diameter part of the side wall in the axial direction that has the smallest dimension is formed on one side in the axial direction. The largest diameter portion of the side wall having the largest dimension is formed on the other side in the axial direction,
There is an air intake (41) that opens below the winding start portion of the side wall and takes in the air that has passed through the air passage. The air taken from the air intake passes between the side wall and the heat exchanger and is heated. A duct case (40) that forms a cooling air passage (42) that circulates to an air flow downstream side of the exchanger;
A motor housing (43) that forms an air passage (45) through which air that has passed through the cooling air passage flows to the electric motor side,
The side walls of the duct case and the scroll casing are integrally formed, and the motor cooling port (44) connected to the cooling air passage in the motor housing is below the side wall, above the heat exchanger, and to the heat. It is located downstream of the air flow with respect to the exchanger.

  According to the first aspect of the present invention, the duct case and the side wall are integrally formed. For this reason, the air blown from the scroll casing can be guided to the electric motor side using the duct case formed integrally with the side wall. Therefore, the electric motor of the blower can be cooled by the air blown out from the fan without adding any parts constituting the casing.

  According to the first aspect of the present invention, the motor cooling port is located on the lower side of the side wall, on the upper side of the heat exchanger and on the downstream side of the air flow with respect to the heat exchanger. For this reason, a fan can be arrange | positioned above a heat exchanger, without a motor cooling port interfering with a heat exchanger. Thereby, in order to avoid interference with a motor cooling port, the dimension of an air flow direction can be made small in a vehicle air conditioner compared with the case where a heat exchanger is arranged in the air flow direction with respect to a blower. The air flow direction is the flow direction of air passing through the heat exchanger.

  According to the first aspect of the present invention, the cooling air passage is formed from the lower side of the winding start portion of the side wall to the downstream side of the air flow of the heat exchanger. For this reason, the distance from an air intake port to a motor cooling port can be lengthened. Therefore, it can suppress that the water blown off with the air from the blower enters the electric motor side through the cooling air passage.

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

It is a figure which shows the cross-sectional structure of the vehicle air conditioner in 1st Embodiment of this invention. It is II-II sectional drawing in FIG. FIG. 3 is a sectional view taken along line III-III in FIG. 2. 3A is a sectional view taken along line AA in FIG. 3, FIG. 3B is a sectional view taken along line BB in FIG. 3, FIG. 3C is a sectional view taken along line CC in FIG. FIG. 4E is a cross-sectional view taken along line EE in FIG. FIG. 3 is a view taken in the direction of arrow X in FIG. 2. It is a fragmentary sectional view of the vehicle air conditioner in 2nd Embodiment of this invention. It is a figure which shows the 1st comparative example of the air blower of the vehicle air conditioner of this invention. It is a figure which shows the 2nd comparative example of the air blower of the vehicle air conditioner of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, parts that are the same or equivalent to each other are given the same reference numerals in the drawings in order to simplify the description.

(First embodiment)
1 to 5 show a first embodiment of a vehicle air conditioner 1 according to the present invention. In the figure, each arrow indicates a vehicle mounting state, a front arrow indicates a front side in the vehicle traveling direction, a rear arrow indicates a rear side in the vehicle traveling direction, an up arrow indicates a heaven region improvement side, and a down arrow indicates a top side in the vertical direction. The right arrow indicates the right side in the vehicle width direction, and the left arrow indicates the left side in the vehicle width direction.

  The vehicle air conditioner 1 of this embodiment is provided with the air blower 10 as shown in FIG. 1 and FIG.

  The blower 10 includes a fan 11 and an electric motor 12. The fan 11 includes a plurality of blades 13. The plurality of blades 13 are arranged in the circumferential direction around the axis of the rotating shaft 12 a of the electric motor 12. The plurality of blades 13 are supported on one axial side (the right side in FIG. 2) of the rotary shaft 12a. The fan 11 is a fan that sucks air from one side in the axial direction of the rotating shaft 12a and blows the sucked air outward in the radial direction of the rotating shaft 12a as the rotating shaft 12a rotates. The rotating shaft 12a is disposed such that its axis CL (see FIG. 2) extends in the vehicle width direction. That is, the axial direction of the rotating shaft 12a is parallel to the vehicle width direction.

  The fan 11 is accommodated in the casing 20. As shown in FIG. 2, the casing 20 is configured by fitting divided case portions 21 and 22. The divided case portion 21 is disposed on one side in the axial direction of the rotating shaft 12a (one side in the vehicle width direction) with respect to the divided case portion 22.

  The split case portion 21 includes a side wall 23 and a wall portion 24. The side wall 23 is formed radially outward with respect to the fan 11. The side wall 23 is formed in a spiral shape around the rotation shaft 12a. The wall portion 24 is formed on one side in the axial direction with respect to the fan 11. The wall portion 24 forms an inlet 30 for sucking air. A bell mouth 30a for smoothly guiding air to the fan 11 side is provided on the outer edge of the suction port 30 in the wall 24. The split case portion 22 includes a wall portion 25 (bottom portion).

  The side wall 23, the wall portion 24, and the wall portion 25 form a scroll casing 26 that houses the fan 11 and constitutes the blower 10. The scroll casing 26 forms an air passage 31 on the radially outer side of the fan 11. The air passage 31 is a passage for collecting and flowing air blown from the fan 11. A blower outlet 33 is provided on the air flow downstream side of the air passage 31, that is, on the winding end 32 side, to blow out the air flowing through the air passage 31 to the outside of the blower 10. The air outlet 33 of the present embodiment blows air forward in the vehicle traveling direction with respect to a cooling heat exchanger 50 described later. Hereinafter, the shape of the scroll casing 26 will be described more specifically.

  As shown in FIG. 3, the nose portion 27 of the scroll casing 26 has one end side in the axial direction of the rotating shaft 12 a (front side in FIG. 3) to the other end side in the axial direction of the rotating shaft 12 a (back side in FIG. 3). The radius of curvature gradually decreases toward the.

  For this reason, the center of curvature 28 at one end of the nose portion 27 in the axial direction of the rotating shaft 12a (hereinafter, this center of curvature is referred to as the inlet side winding start portion) 28 and the axial direction of the rotating shaft 12a of the nose portion 27. A line segment 27a connecting the center of curvature (hereinafter, this center of curvature is referred to as a motor-side winding start portion) 29 at the other end is inclined with respect to the axial direction of the rotating shaft 12a. The motor side winding start portion 29 corresponds to the winding start portion in the present invention.

  In the present embodiment, the suction-side winding start portion 28 and the motor-side winding start portion 29 are arranged below the winding end 32 in the vertical direction.

  The scroll casing 26 rotates from the motor side winding start portion 29 to the winding end portion 32 in a dimension from the rotation shaft 12a (that is, the rotation center of the fan 11) to the side wall 23 (hereinafter, this dimension is referred to as a scroll radius). It is formed so as to change in the axial direction of the shaft 12a.

  FIG. 4A is a cross-sectional view taken along the line AA in FIG. Here, the line segment AA is a line segment connecting the motor side winding start portion 29 and the rotation center of the fan 11. Hereinafter, this AA cross section is referred to as a cross section at the motor side winding start portion 29.

  The cross-sectional shape of the side wall 23 of the scroll casing 26 at the motor-side winding start portion 29 is as follows: on the suction port 30 side (upper side in FIG. 4A), the axial direction of the rotary shaft 12a (vertical direction in FIG. 4A). It is substantially parallel, and on the electric motor 12 side (the lower side in FIG. 4A), it inclines radially outward of the scroll casing 26 (to the right side in FIG. 4A) toward the motor side wall 18. ing.

  Specifically, the scroll radius becomes the minimum radius r at the end portion on the suction port 30 side (upper end portion in FIG. 4A), and becomes the maximum at the end portion on the electric motor 12 side (lower end portion in FIG. 4A). The radius is R. That is, in the side wall 23 of the scroll casing 26, the maximum radius R is set at a portion closer to the wall portion 25 on the opposite side of the wall portion 2 than the wall portion 24 on the suction port 30 side, and the wall portion 24 rather than the wall portion 25. A minimum radius r is set in a region close to. Therefore, in the axial direction, the smallest diameter portion having the smallest scroll radius in the side wall 23 is formed on one side in the axial direction. In the axial direction, the maximum diameter portion of the side wall 23 having the largest scroll radius is formed on the other side in the axial direction.

  Then, as shown in FIGS. 4B to 4E, the cross-sectional shape of the side wall 23 changes from the motor side winding start portion 29 toward the winding end portion 32. The side wall 23 has a shape in which the electric motor 12 side is inclined outwardly of the scroll casing 26 from the motor side winding start portion 29 toward the winding end portion 32, so that the axial direction of the rotary shaft 12 a (FIG. 4B to ( It changes to a shape parallel to the vertical direction e).

  In other words, the cross-sectional shape of the air passage 31 is a shape in which the electric motor 12 side region expands to the radially outer side of the scroll casing 26 rather than the suction port 30 side region as it goes from the motor side winding start portion 29 to the winding end portion 32. To a rectangular shape.

  Specifically, in a cross section (BB cross section to DD cross section) in an intermediate portion between the motor side winding start portion 29 and the winding end portion 32, a cross section (AA cross section) in the motor side winding start portion 29. Similarly, the scroll radius is the minimum radius r at the end of the suction port 30 and the maximum radius R at the end of the electric motor 12.

  Here, the minimum radius r increases from the winding start portion 23 toward the winding end portion 32. Specifically, the minimum radius r changes logarithmically with respect to the inlet side winding angle θ1, that is, r = r0 · exp (θ1 · tan (α)).

  Here, as shown in FIG. 3, the inlet-side winding angle θ <b> 1 refers to an angle in the fan rotation direction a from a reference line L <b> 1 connecting the inlet-side winding start portion 28 and the rotation center of the fan 11. r0 is the minimum radius on the reference line L1. Further, α is a divergence angle, and in this example, the divergence angle α is 3 to 5 degrees. In this example, the minimum radius r is logarithmically increased, but the minimum radius r may be increased linearly in proportion to the inlet-side winding angle θ1, or is limited to these. You may make it become large continuously without being done.

  On the other hand, the maximum radius R is constant from the motor side winding start portion 29 to the winding end portion 32. In other words, the maximum radius R is constant regardless of the motor side winding angle θ2. Here, the motor-side winding angle θ2 is an angle measured in the fan rotation direction a from a reference line L2 connecting the motor-side winding start portion 29 and the rotation center of the fan 11, as shown in FIG. And in the cross section (EE cross section) in the winding end part 32, since the minimum radius r is the same dimension as the maximum radius R, the cross-sectional shape of the air passage 31 is a rectangular shape. The height dimension of the air passage 31 of this embodiment (the dimension in the axial direction of the rotating shaft (the vertical dimension in FIGS. 4A to 4E)) gradually increases from the motor side winding start portion 29 to the winding end portion 32. It is getting bigger.

  As shown in FIGS. 1 and 2, a duct case 40 is provided in the split case 21 of the casing 20. The duct case 40 is formed on the fan 11 side (that is, one axial direction side of the rotating shaft 12a) with respect to the electric motor 12 and below the side wall 23 of the scroll casing 26. The duct case 40 is provided with a forming portion 40 a that forms a cooling air passage 42. The cooling air passage 42 is a passage through which the air taken in from the air intake 41 is circulated to the air outlet 42a. In the cooling air passage 42 of the present embodiment, the air outlet 42 a is positioned above the air inlet 41. The air intake 41 is disposed below the nose portion 27 (that is, the motor-side winding start portion 29) of the scroll casing 26 and opens toward the air outlet 33. Specifically, the air intake 41 opens obliquely downward on the front side in the vehicle traveling direction. The cooling air passage 42 passes from the air intake 41 through the side wall 23 of the scroll casing 26 and the cooling heat exchanger 50 to the downstream side of the cooling heat exchanger 50 (the vehicle rear side). It extends. The air outlet 42 a is located below the side wall 23 of the scroll casing 26 and above the cooling heat exchanger 50 on the downstream side of the air flow with respect to the cooling heat exchanger 50.

  Here, the outer surface 40b of the duct case 40 of FIG. 2 is formed in a U-shaped cross section that is convex toward one side in the axial direction of the rotating shaft 12a. The forming portion 40a (inner surface) has a U-shaped cross section that is convex toward one side in the axial direction of the rotary shaft 12a so as to be along the outer surface 40b. A space surrounded by the forming portion 40 a and the divided case portion 22 constitutes the cooling air passage 42.

  The split case portion 22 is provided with a connection portion 44 a that connects between the air outlet 42 a of the cooling air passage 42 and the motor cooling port 44 of the motor flange 43. The motor flange 43 supports the electric motor 12 and forms an air passage 45 through which air blown from the cooling air passage 42 through the motor cooling port 44 flows to the electric motor 12 side. The motor cooling port 44 is an air intake port that takes in air blown out from the cooling air passage 42 in the air passage 45 of the motor flange 43.

  In the present embodiment, the motor cooling port 44 is located below the side wall 23 of the scroll casing 26, above the cooling heat exchanger 50 and downstream of the cooling heat exchanger 50. The duct case 40 and the side wall 23 and the wall portion 24 of the scroll casing 26 are resin parts integrally molded by injection molding using a mold. As described above, the cross-sectional area of the cooling air passage 42 is the same as the cross-sectional area of the motor cooling port 44 connected to the cooling air passage 42 in the air passage 45 of the motor flange 43 or the cross-sectional area of the motor cooling port 44. Is also getting bigger.

  1 includes a cooling heat exchanger 50, a heating heat exchanger 60, an air mix door 70, and mode doors 80 and 81 in the casing 20.

  The cooling heat exchanger 50 is disposed on the lower side of the blower 10 in the vertical direction. The cooling heat exchanger 50 is formed in a flat shape by the first and second tanks and the heat exchange core disposed between the first and second tanks. The heat exchange core is composed of a plurality of tubes arranged in the vehicle width direction and heat exchange fins arranged on the surfaces of the plurality of tubes. An air outflow surface 50a for blowing out air is formed on one side in the thickness direction of the heat exchange core.

  The cooling heat exchanger 50 is arranged in an upright state with the air outflow surface 50a parallel to the vehicle width direction (vehicle left-right direction) and toward the vehicle rear side. The cooling heat exchanger 50 constitutes a refrigeration cycle that circulates refrigerant together with a compressor, an expansion valve, a condenser, etc., cools the air blown out from the outlet 33 of the blower 10 by the refrigerant, and cools the air outflow surface. Blow out from 50a.

  In the present embodiment, a filter 50b is disposed on the front side in the vehicle traveling direction with respect to the cooling heat exchanger 50. The filter 50 b filters air blown from the blower outlet 33 of the blower 10. The cooling heat exchanger 50 and the filter 50b are supported by the casing 20.

  The heating heat exchanger 60 is arranged in a state of being stood on the rear side of the vehicle with respect to the cooling heat exchanger 50. The heating heat exchanger 60 is formed in a flat shape by a plurality of tubes and the like arranged in the vehicle width direction between the first and second tanks and the first and second tanks. The heating heat exchanger 60 heats the cold air blown from the cooling heat exchanger 50 with hot water (engine cooling water). The heating heat exchanger 60 is supported by the casing 20.

  A bypass passage 90 is formed between the cooling heat exchanger 50 and the heating heat exchanger 60 in the casing 20. The bypass passage 90 is a passage that guides the cold air blown out from the cooling heat exchanger 50 to the openings 100, 101, and 102 by bypassing the heating heat exchanger 60. The openings 100, 101, 102 are a collective term for the foot opening 100, the defroster opening 101, and the face opening 102.

  The foot opening 100 blows conditioned air toward the passenger's lower body. The defroster opening 101 blows conditioned air on the inner surface of the windshield. The face opening 102 blows conditioned air toward the passenger's upper body.

  A hot air passage 91 is formed in the casing 20 on the vehicle rear side of the heating heat exchanger 60. The warm air passage 91 is a passage that guides the warm air blown out from the heating heat exchanger 60 to the heaven region improvement side. A mixing space 92 for mixing the cold air from the bypass passage 90 and the hot air from the heating heat exchanger 60 is formed above the bypass passage 90 in the casing 20.

  The air mix door 70 changes the ratio of the opening area of the bypass passage 90 and the opening area of the heating heat exchanger 60 to change the amount of air passing through the bypass passage 90 and the amount of air passing through the heating heat exchanger 60. And change the ratio.

  The mode door 80 opens one of the air passage 110 and the foot opening 100 and closes the other opening. The air passage 110 is an air passage formed between the defroster opening 101 and the face opening 102 and the foot opening 100. The mode door 81 opens one of the defroster opening 101 and the face opening 102 and closes the other opening. The air mix door 70 and the mode doors 80 and 81 are each driven by a switch via a link mechanism.

  Next, the operation of this embodiment in the above configuration will be described. First, when the electric motor 12 rotationally drives the fan 11 in the direction of arrow a in FIG. 3, the fan 11 blows out the air sucked from the suction port 30 on one end side in the axial direction of the rotating shaft 12 a to the radially outer side of the fan 11. . The air blown out from the fan 11 flows through the air passage 31 toward the winding end portion 32 and is blown out from the blowout port 33 to the cooling heat exchanger 50 side.

  Here, attention is paid to the wind speed distribution of the air blown from the fan 11 and the cross-sectional shape of the air passage 31 in the range from the winding end portion 32 to the motor side winding start portion 29. As can be seen from FIG. 4E, at the winding end portion 32, the air passage width (the dimension of the air passage 31 in the direction orthogonal to the rotating shaft 12a (the left-right direction in FIGS. 4A to 4E)) is sucked. It is wide throughout the entire area from the end on the mouth 30 side to the end on the electric motor 12 side.

  As can be seen from FIG. 4A, in the motor side winding start portion 29, the air passage width on the suction port 30 side is narrow, but the air speed distribution on the electric motor 12 side is biased toward the electric motor 12 side. Accordingly, it is wider than the air passage width on the suction port 30 side. In other words, on the electric motor 12 side, the air passage width at the motor-side winding start portion 29 is substantially the same as the air passage width at the winding end portion 32. For this reason, since it can suppress that the static pressure between the braid | blades 13 (static pressure between blades) raises in the motor side winding start part 29, the fluctuation | variation of the static pressure between blades can be suppressed. As a result, it is possible to reduce noise due to the fluctuation of the interblade static pressure.

  Since the minimum radius r of the scroll radius in the axial direction is set on the suction port 30 side of the scroll casing 26, the communication area between the winding end portion 32 and the suction port side winding start portion 28 is increased. Can be suppressed. For this reason, since it can suppress that the air (recirculation flow) which flows into the inlet side winding start part 28 again from the winding end part 32 side increases, while being able to suppress that ventilation performance falls, a recirculation flow and a fan It is possible to suppress an increase in noise due to a collision with the air blown out from the air 11.

  Such a blower 10 blows air from the blower outlet 33 toward the front side of the vehicle with respect to the cooling heat exchanger 50. Then, the air blown out from the outlet 33 passes through the filter 50b and flows to the cooling heat exchanger 50. At this time, the air is cooled by the refrigerant of the cooling heat exchanger 50 and blown out from the cooling heat exchanger 50 to the rear side of the vehicle.

  A part of the cold air blown out from the cooling heat exchanger 50 passes through the bypass passage 90, and the remaining cold air is heated by the heating heat exchanger 60 and blown out from the heating heat exchanger 60 as hot air. . Along with this, the warm air from the heating heat exchanger 60 flows into the mixing space 92 through the warm air passage 91. In the mixing space 92, the hot air that has passed through the hot air passage 91 and the cold air that has passed through the bypass passage 90 are mixed and flow to the openings 100, 101, 102 side as conditioned air.

  For example, in a state where the mode door 80 opens the foot opening 100, the conditioned air from the mixing space 92 is blown out through the foot opening 100 into the vehicle interior. When the mode door 80 opens the air passage 110 and the mode door 81 opens the defroster opening 101, the conditioned air from the mixing space 92 is blown out through the defroster opening 101 into the vehicle interior. When the mode door 81 opens the air passage 110 and the mode door 81 opens the face opening 102, the conditioned air from the mixing space 92 is blown out through the face opening 102 into the vehicle interior.

  A part of the air blown from the blower outlet 33 of the blower 10 is circulated to the electric motor 12 side through the air intake port 41, the cooling air passage 42, the air outlet 42 a, the motor cooling port 44, and the air passage 45. For this reason, the electric motor 12 is cooled by the ventilation from the blower 10.

  According to the present embodiment described above, in the vehicle air conditioner 1, the blower 10 is formed in a spiral shape from the motor side winding start portion 29 to the winding end portion 32, and distributes air blown from the fan 11. A scroll casing 26 having a side wall 23 forming a passage 31 is provided. The cooling heat exchanger 50 is in a standing state and parallel to the vehicle width direction. In the blower 10, the axial direction of the rotating shaft 12 a of the electric motor 12 is parallel to the vehicle width direction above the cooling heat exchanger 50. The duct case 40 forms a cooling air passage 42 through which air taken from the air intake port 41 flows between the side wall 23 and the cooling heat exchanger 50 to the downstream side of the air flow of the cooling heat exchanger 50. The motor flange 43 supports the electric motor 12 and forms an air passage 45 through which air that has passed through the air passage 45 circulates to the electric motor 12 side. Of the motor flange 43, the motor cooling port 44 connected to the cooling air passage 42 is below the side wall 23, above the cooling heat exchanger 50 and downstream of the cooling heat exchanger 50. Located on the side. The duct case 40 and the side wall 23 are resin parts integrally formed by injection molding.

  As described above, the air blown from the air outlet 33 can be guided to the electric motor 12 side using the duct case 40 integrally formed with the side wall 23. For this reason, the electric motor 12 of the blower 10 can be cooled by the air blown out from the fan 11 without adding the components constituting the casing 20.

  In the present embodiment, the motor cooling port 44 is located below the side wall 23, above the cooling heat exchanger 50 and downstream of the cooling heat exchanger 50 in the air flow direction. For this reason, the blower 10 can be disposed above the cooling heat exchanger 50 without the motor cooling port 44 interfering with the cooling heat exchanger 50. That is, the blower 10 can be disposed on the upper side of the cooling heat exchanger 50 while reducing the distance between the motor-side winding start portion 29 and the cooling heat exchanger 50. Therefore, in order to avoid interference with the motor cooling port 44, compared with the case where the cooling heat exchanger 50 is disposed on the rear side of the vehicle with respect to the blower 10, the vehicle air-conditioning apparatus 1 has a vehicle front-rear direction (that is, cooling). The dimension of the heat exchanger 50 in the air flow direction can be reduced.

  In the present embodiment, the cross-sectional area of the cooling air passage 42 has the same area as the cross-sectional area of the motor cooling port 44 connected to the cooling air passage 42 in the air passage 45 of the motor flange 43 or the motor cooling port as described above. The cross-sectional area of 44 is larger. Thereby, the pressure loss produced when air is circulated from the air intake 41 to the electric motor 12 through the cooling air passage 42 and the air passage 45 can be reduced.

  In addition, when the blower 10 sucks water from the suction port 30 together with air, the blower 10 may blow out the water from the blowout port 33 together with the air. Therefore, in the present embodiment, the cooling air passage 42 is formed from the air intake 41 to the rear side of the cooling heat exchanger 50 through the space between the scroll casing 26 and the cooling heat exchanger 50. For this reason, the distance from the air intake port 41 to the motor cooling port 44 of the motor flange 43 can be increased. Therefore, it is possible to make it difficult for water blown out from the air outlet 33 to enter the motor flange 43 from the air intake 41 side.

  In the present embodiment, in the cooling air passage 42, the air outlet 42 a is positioned above the air intake 41. For this reason, it can be made difficult for water to enter the air outlet 42 a side from the air inlet 41.

(Second Embodiment)
In the present embodiment, referring to FIG. 6, an example in which a protrusion 40 b is provided in the cooling air passage 42 in the duct case 40 to prevent water from entering the cooling air passage 42 in the first embodiment. I will explain. FIG. 6 is a partially enlarged view showing the inside of the cooling air passage 42 in the duct case 40. In the present embodiment, as shown in FIG. A plurality of protrusions 40b are provided. The plurality of protrusions 40b protrude toward the air intake 41 side. For this reason, it can prevent that the water which advanced from the air intake 41 side advances to the electric motor 12 side.

  Here, the cooling air passage 42 is formed from the air intake 41 to the rear side of the cooling heat exchanger 50 through the space between the scroll casing 26 and the cooling heat exchanger 50. For this reason, the distance from the air intake 41 to the motor flange 43 can be increased. For this reason, the number of the projection parts 40b installed in the formation part 40a of the duct case 40 can be increased. Accordingly, it is possible to reliably prevent water from proceeding to the motor flange 43 side.

(Other embodiments)
In the said 1st, 2nd embodiment, although the example which set the vehicle air conditioner 1 provided with the heat exchanger 50 for cooling and the heat exchanger 60 for heating as this invention was described, it replaced with this and the heat for cooling was demonstrated. The vehicle air conditioner 1 including one of the exchanger 50 and the heat exchanger 60 for heating may be the present invention. In this case, in the vehicle air conditioner 1 that does not use the cooling heat exchanger 50, the heating heat exchanger 60 is used as the heat exchanger of the present invention, and the blower 10 is disposed on the upper side of the heating heat exchanger 60. Also good.

  In the first and second embodiments described above, the example in which the height dimension of the air passage 31 is gradually increased from the motor side winding start portion 29 to the winding end portion 32 has been described. The height dimension may be the same from the motor side winding start portion 29 to the winding end portion 32.

  In the second embodiment, the example in which the protruding portion 40b is provided on the forming portion 40a side of the forming portion 40a and the split case portion 22 of the duct case 40 that forms the cooling air passage 42 has been described. Thus, the protrusion 40b may be provided on the divided case portion 22 side. Or you may provide the projection part 40b in each of the formation part 40a and the division | segmentation case part 22. As shown in FIG.

  In addition, this invention is not limited to above-described embodiment, In the range described in the claim, it can change suitably. Further, the above embodiments are not irrelevant to each other, and can be combined as appropriate unless the combination is clearly impossible.

DESCRIPTION OF SYMBOLS 1 Vehicle air conditioner 10 Blower 11 Fan 12 Electric motor 20 Casing 21, 22 Split case part 23 Side wall 26 Scroll casing 28 Inlet side winding start part 29 Motor side winding start part 31 Air passage 32 End of winding part 50 Cooling heat exchange (Heat exchanger)
40 Duct case 43 Motor flange (motor housing)

Claims (4)

A blower (10) and a heat exchanger (50) disposed on the lower side of the blower,
The blower has a plurality of blades (13) arranged in a circumferential direction centering on a rotating shaft (12a) of an electric motor, and one of the rotating shafts in the axial direction as the rotating shaft rotates. A fan (11) that blows out air sucked in from the side to the outside in the radial direction of the rotating shaft, and a spiral shape around the rotating shaft from the winding start portion (29) to the winding end portion (32) that houses the fan. A scroll casing (26) having a side wall (23) that forms an air passage (31) through which air blown from the fan is formed.
The heat exchanger exchanges heat with the air that has passed through the air passage,
The dimension between the rotating shaft and the side wall changes in the axial direction from the winding start portion to the winding end portion, and the smallest diameter portion of the side wall in the axial direction that has the smallest dimension is the shaft. Formed on one side of the direction, the largest diameter portion where the dimension is the largest among the side walls in the axial direction is formed on the other side of the axial direction,
There is an air intake (41) that opens below the winding start portion of the side wall and takes in air that has passed through the air passage, and the air taken in from the air intake is in the side wall and the heat exchanger. A duct case (40) that forms a cooling air passage (42) that passes between them and flows to the downstream side of the air flow of the heat exchanger;
A motor housing (43) that forms an air passage (45) through which air that has passed through the cooling air passage flows to the electric motor side,
Side walls of the duct case and the scroll casing are integrally formed, and a motor cooling port (44) connected to the cooling air passage in the motor housing is provided on the lower side of the side wall. An air conditioner for a vehicle, which is located on the upper side of the unit and on the downstream side of the air flow with respect to the heat exchanger.   2. The vehicle according to claim 1, wherein a cross section of a formation portion (40 a) that forms the cooling air passage in the duct case is formed to be convex toward one side in the axial direction. Air conditioner.   3. The vehicle air conditioning according to claim 1, wherein a cross-sectional area of the cooling air passage is equal to a cross-sectional area of the motor cooling port, or is larger than a cross-sectional area of the motor cooling port. apparatus.   A protrusion (40a) that forms the cooling air passage in the duct case protrudes toward the air intake side and prevents protrusion of water that has advanced from the air intake side toward the electric motor. The vehicle air conditioner according to any one of claims 1 to 3, wherein a portion (40b) is provided.

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