JP4913460B2 - Air conditioner for vehicles - Google Patents

Description

  The present invention relates to a vehicle air conditioner having a blower in which a fan is housed in a scroll (spiral) chamber.

  As a thing relevant to this kind of prior art, the "air blower for an air conditioning" described in patent document 1, for example is mentioned. As shown in FIG. 10, a blower 101 includes a casing 104 having two scroll chambers 102 and 103 arranged in parallel in the axial direction, and a pair of fans 105 and 106 housed in the scroll chambers 102 and 103, An electric motor 107 that drives the fans 105 and 106 is provided. When the electric motor 107 is driven, the pair of fans 105 and 106 is rotated so that air is introduced from the outside of the vehicle interior through the intake port 108. The pair of fans 105 and 106 are sucked from both sides in the axial direction and discharged from the discharge port 109.

As another conventional example, there is “a motor support structure of a vehicle air conditioner” described in Patent Document 2. As shown in FIG. 11, the blower 111 includes a casing 114 having two scroll chambers 112 and 113 arranged in parallel in the axial direction, and a pair of fans 115 and 116 housed in the scroll chambers 112 and 113, respectively. And the electric motor 117 that drives the fans 115 and 116, and when the electric motor 117 is driven, the pair of fans 115 and 116 are rotated, whereby the suction ports 118 and 119 that are arranged on both sides in the axial direction. A pair of fans 115 and 116 are respectively sucked from one side in the axial direction and discharged from a discharge port (not shown).
Japanese Patent Laid-Open No. 7-144528 (paragraph numbers 0009 to 0011, FIG. 2) Japanese Patent Laid-Open No. 3-96422 (FIG. 4)

  However, in the conventional technique described in Patent Document 1 described above, a pair of fans 105 and 106 require a large space inlet 108 for sucking air from both sides in the axial direction. There is a problem that the strength of the vehicle body is impaired. Moreover, in the prior art described in Patent Document 2, the pair of fans 115 and 116 suck air from one side in the axial direction, so that there is a problem that the suction efficiency is lowered.

  The present invention has been made in consideration of the above-described prior art, and an object of the present invention is to provide a vehicle air conditioner that can reduce the size of a blower that can suck air from both sides in the axial direction of the blower fan. The purpose is to do.

The invention of claim 1, which achieves the above object, includes a scroll chamber having at least two suction ports and expanding in a spiral shape in the radial direction, and a fan housed in the scroll chamber, and a blower provided in the casing. A vehicle air conditioner that is connected to the casing and includes a vehicle interior and an internal / external air switching box that selectively introduces air outside the vehicle into the casing, wherein the internal / external air switching box is provided in the scroll chamber. It is arranged on one side of the suction port, and is located between the winding start region starting to spiral in the scroll chamber and the casing side wall facing the winding start region, and the inside / outside air switching box and the suction port the suction passage connecting the other side is provided, the scroll chamber, to characterized in that the radius of the winding start region is constant, is set and to be smaller than the radius of the region other than the winding start region .

  The invention of claim 2 is the vehicle air conditioner according to claim 1, wherein two sets of the scroll chamber and the fan are provided, and these fans are supported at both ends of a drive shaft of one motor. It is characterized by that.

  A third aspect of the present invention is the vehicle air conditioner according to the second aspect, wherein the inside / outside air suction boxes are arranged on both sides in the axial direction of the drive shaft.

  In the present invention, when the air inside and outside the vehicle interior is taken in from the inside / outside air switching box by the blower, the air from the inside / outside air switching box is sucked into the scroll chamber through one suction port, and from the inside / outside air switching box Air introduced through the suction passage is sucked into the scroll chamber through the other suction port. Thereby, air can be sucked in from both axial sides of the fan. In addition, since the suction passage is arranged in the winding start region where the scroll chamber starts to spiral, the blower can be controlled by suppressing the radius of the scroll chamber in the winding start region without reducing the suction efficiency of the fan. Can be made compact.

  Hereinafter, a vehicle air conditioner according to an embodiment of the present invention will be described with reference to the drawings. 1 is a cross-sectional view showing a vehicle air conditioner according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line AA of FIG. 1, and FIG. 3 is a vehicle mounted with the vehicle air conditioner of FIG. 4 is a cross-sectional view illustrating the cross-sectional shape of the scroll chamber and the suction passage, FIG. 5 is a characteristic diagram illustrating the spiral shape of the scroll chamber, and FIG. 6 is a portion of the scroll chamber and the suction passage. FIG. 7 is a characteristic diagram showing the measurement result of the single noise level of this embodiment, FIG. 8 is a plan view showing the planar position of the noise measurement microphone, and FIG. 9 is a side view showing the height position of the noise measurement microphone. FIG.

  As shown in FIG. 3, the vehicle air conditioner 1 according to the present embodiment is housed in an instrument panel 3 in the front part of the passenger compartment 2, and mainly includes a blower 4 and an air conditioner unit 5.

  As shown in FIG. 2, the blower 4 includes a casing 8 having a first scroll chamber 6 and a second scroll chamber 7 arranged in parallel in the axial direction, and a pair of fans (so-called twins) respectively housed in the scroll chambers 6 and 7. Fan) 9 and 10, and an electric motor 12 that is interposed between the fans 9 and 10 and drives the fans 9 and 10 via drive shafts 11 protruding on both sides. A first inside / outside air switching box 13 and a second inside / outside air switching box 14 for introducing air inside and outside the vehicle compartment 2 are provided on both sides in the direction.

  In addition, as shown in FIGS. 1, 3, and 4, the air conditioner unit 5 has a blower passage 15 that is continuous with the casing 8 of the blower 4, and foreign matter contained in the passing air is placed in the middle of the blower passage 15. An air filter 16 to be captured, an evaporator 17 that is a heat exchanger for cooling, a mix door 18 that adjusts a ratio of air to be heated and air to be bypassed, and a heater core 19 that is a heat exchanger for heating are sequentially arranged. It is installed. Further, ducts 20 and 21 are branched from the downstream side of the air passage 15, and a differential outlet 22 provided at the top of the instrument panel 3 and a vent outlet duct 23 are provided at the respective ends of the ducts 20 and 21. A foot outlet duct provided at the lower part of the instrument panel 3 is provided at the tip of the remaining duct (not shown).

  And in the vehicle air conditioner 1 of this embodiment, the 1st scroll chamber 6 is provided with the axial direction outer side inlet 31 and the inner side inlet 32, and the 2nd scroll chamber 7 is also provided with the axial direction inner side inlet. 33 and the outer suction port 34 are provided, and the inner suction ports 32 and 33 face each other. The first inside / outside air switching box 13 communicates directly with the outer suction port 31 and communicates with the inner suction port 32 via a first suction passage 35 formed between the first scroll chamber 6 and the casing 8. Yes. Similarly, the second inside / outside air switching box 14 communicates directly with the outer suction port 34 and is connected to the inner suction port 33 via a second suction passage 36 formed between the second scroll chamber 7 and the casing 8. Communicate.

  As shown in FIG. 4, the scroll chamber 6 expands in a spiral shape from the scroll narrowest portion P to the radial direction of the fan 9, and the scroll narrowest portion P is near one end of the connection portion 6 a of the scroll chamber 6. In the narrowest scroll portion P, the scroll radius (the radius of the scroll chamber 6) R is the smallest. As shown in FIG. 5, the inflection point of the scroll radius R is set at a part where the scroll winding angle θ from the narrowest part P of the scroll is angles a and b. That is, the scroll radius R is constant in the first scroll region α in which the scroll winding angle θ is from the scroll narrowest portion P to the angle a, and the second scroll region β in which the scroll winding angle θ is from angle a to angle b. , The scroll radius R gradually increases at a constant rate, and in the third scroll region γ where the scroll winding angle θ exceeds the angle b, the scroll radius R increases at a constant rate more than the second scroll region β.

  As shown in FIG. 4, the spiral-shaped region of the scroll chamber 6 is divided into approximately three equal parts, and the first scroll region α in the counterclockwise direction from the scroll narrowest portion P (that is, the winding start region on the winding start side). The first suction passage 35 that communicates the inside / outside air switching box 13 and the suction port 32 is disposed between the first scroll region α and the casing side wall 37 that faces the first scroll region α, and the second suction passage 36 is also the same. It is. Even if the scroll chamber 6 suppresses the scroll radius R on the spiral start side as described above, the suction performance of the fan 9 is hardly adversely affected. The same applies to performance.

  In the first embodiment, when the blower 4 takes air inside and outside the vehicle compartment 2 from the inside / outside air switching boxes 13 and 14 and blows it to the air passage 15, the air from the first inside / outside air switching box 13 While being sucked into the scroll chamber 6 through the outer suction port 31, the air in the second inside / outside air switching box 14 is sucked into the scroll chamber 7 through the outer suction port 34, and at the same time, these inside / outside air switching boxes 13, 14 is introduced into the scroll chambers 6 and 7 through the inner suction ports 32 and 33 through the first suction passage 35 and the second suction passage 36.

  Next, when the discharge air sent from the blower 4 to the air passage 15 passes through the air filter 16, foreign matter contained in the discharge air is captured, and the purified air is cooled by the evaporator 17. For example, when the mix door 18 rises during heating, the cool air from the evaporator 17 is heated by the heater core 19, and then warm air is blown into the passenger compartment 2. On the other hand, when the mix door 18 descends during cooling, the cool air from the evaporator 17 bypasses the heater core 19 and is blown into the vehicle compartment 2.

  In 1st Embodiment comprised in this way, since the air can be sucked in from the axial both sides of the fans 9 and 10, the suction efficiency of the fans 9 and 10 can be improved. Further, by reducing the scroll radius R in the winding start region on the winding start side of each scroll chamber 6, 7, the width dimension D 1 of each scroll chamber 6, 7 is suppressed as shown in FIG. Since the suction passages 35 and 36 having the predetermined dimension D2 are respectively formed between the scroll chambers 6 and 7 and the casing 8, the fan 4 can be made compact without reducing the suction efficiency of the fans 9 and 10.

  FIG. 7 is a cross-sectional view showing a vehicle air conditioner according to a second embodiment of the present invention. In FIG. 7, the same components as those shown in FIGS.

  As shown in FIG. 7, in this embodiment, compared with 1st Embodiment shown in FIGS. 1-6, the scroll chamber 6, the fan 9, the inside / outside air switching box 13, and the suction passage 35 are each 1 in the air blower 4a. The only difference is that the inside / outside air switching box 13 is connected to one end in the axial direction of the casing 8a and the other end is closed, and the other configurations are basically the same.

  Also in the second embodiment configured as described above, by providing the suction passage 35 between the scroll chamber 6 and the casing 8a, air can be sucked from both sides of the fan 9, and the winding start side of the scroll chamber 6 Since the suction passage 35 is disposed in the above-described winding start region while suppressing the scroll radius R in the winding start region, the fan 4a can be made compact without reducing the suction efficiency of the fan 9.

  FIG. 8 is a sectional view showing a vehicle air conditioner according to a third embodiment of the present invention. In FIG. 8, the same components as those shown in FIGS.

  As shown in FIG. 8, in the present embodiment, compared to the first embodiment shown in FIGS. 1 to 6, only one inside / outside air switching box 13 is provided in the blower 4 b, and inside suction is performed in the second scroll chamber 7. The only difference is that only the port 33 is provided, the inside / outside air switching box 13 is connected to one end of the casing 8b in the axial direction and the other end is closed, and the other configurations are basically the same.

  Also in the third embodiment configured as described above, by providing the suction passage 35 between the scroll chamber 6 and the casing 8b, air can be sucked from both sides of the fan 9, and the winding start side of the scroll chamber 6 Since the suction passage 35 is arranged in the above-described winding start region while suppressing the scroll radius R in the winding start region, the fan 4b can be made compact without reducing the suction efficiency of the fan 9.

  FIG. 9 is a sectional view showing a vehicle air conditioner according to a fourth embodiment of the present invention. In FIG. 9, the same components as those shown in FIGS.

  As shown in FIG. 9, in this embodiment, compared to the first embodiment shown in FIGS. 1 to 6, the blower 4 c is provided with only one inside / outside air switching box 13, and the above-mentioned one end in the axial direction of the casing 8 c is described above. The inside / outside air switching box 13 is connected and the other end is closed, and other configurations are basically the same.

  Even in the fourth embodiment configured as described above, by providing the first suction passage 35 between the first scroll chamber 6 and the casing 8, air can be sucked from both sides in the axial direction of the fan 9, The air introduced through the first suction passage 35 and the second suction passage 36 can be sucked from both sides of the fan 10 in the axial direction. In addition, since the respective suction passages 35 and 36 are disposed in the above-described winding start region while suppressing the scroll radius R in the winding start region on the winding start side of each scroll chamber 6, 7, the suction efficiency of the fans 9, 10 is increased. The fan 4c can be made compact without reducing it.

It is sectional drawing which shows the vehicle air conditioner which concerns on 1st Embodiment of this invention. It is sectional drawing which follows the AA line of FIG. It is sectional drawing which shows the state which mounted the vehicle air conditioner of FIG. 1 in the vehicle. It is sectional drawing explaining the cross-sectional shape of a scroll chamber and a suction passage. It is a characteristic view explaining the spiral shape of a scroll chamber. It is a perspective view which shows the part of a scroll chamber and a suction passage. It is sectional drawing which shows the vehicle air conditioner which concerns on 2nd Embodiment of this invention. It is sectional drawing which shows the vehicle air conditioner which concerns on 3rd Embodiment of this invention. It is sectional drawing which shows the vehicle air conditioner which concerns on 4th Embodiment of this invention. It is sectional drawing which shows the prior art example of an air blower. It is sectional drawing which shows the other conventional example of an air blower.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle air conditioner 2 Cabin 4, 4a, 4b, 4c Blower 6 First scroll chamber (scroll chamber)
7 Second scroll chamber (scroll chamber)
8, 8a, 8b, 8c Casing 9, 10 Fan 13 First inside / outside air switching box (inside / outside air switching box)
14 Second inside / outside air switching box (inside / outside air switching box)
31, 32, 33, 34 Suction port 35 First suction passage (suction passage)
36 Second suction passage (suction passage)

Claims (3)

A scroll chamber (6, 7) having at least two suction ports (31, 32, 33, 34) and expanding in a spiral shape in the radial direction, and a fan (9) accommodated in the scroll chamber (6, 7) , 10) in the casing (8, 8a, 8b, 8c) and connected to the casing (8, 8a, 8b, 8c) and the casing (8, 8a, 8b, 8c) An air conditioner (1) for a vehicle comprising an inside / outside air switching box (13, 14) for selectively introducing air into the casing (8, 8a, 8b, 8c),
While arranging the inside / outside air switching box (13, 14) on one side (31, 34) of the suction port provided in the scroll chamber (6, 7),
The inside / outside air switching box (37) is located between a winding start region (α) starting to spiral in the scroll chamber (6, 7) and the casing side wall (37) facing the winding start region (α). 13, 14) and a suction passage (35, 36) communicating the other side (32, 33) of the suction port (31, 32, 33, 34) ,
The scroll chamber (6, 7) is set so that the radius of the winding start area (α) is constant and smaller than the radius of the areas (β, γ) excluding the winding start area. A vehicle air conditioner (1). The vehicle air conditioner (1) according to claim 1,
While providing two sets of the scroll chamber (6, 7) and the fan (9, 10),
These fans (9, 10) are supported on both ends of a drive shaft (11) of one motor (12), and are equipped with a vehicle air conditioner (1). The vehicle air conditioner (1) according to claim 2,
The vehicle air conditioner (1), wherein the inside / outside air suction boxes (13, 14) are arranged on both sides in the axial direction of the drive shaft (11).

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