JP5770914B1 - Air conditioner for vehicles - Google Patents

Abstract

An object of the present invention is to provide a vehicle air conditioner in which measures for weight reduction and noise reduction are taken. An air conditioner for a vehicle according to the present invention includes a case having an air passage and an air blower for supplying air to the air passage. A part of the inner wall surface of the wall that forms the downstream air passage 3 is a reflection surface 51 that reflects the noise of the blower 22 toward the upstream side of the air passage 3. The thickness is greater than the thickness of the wall of the portion where the surface 52 connected to the reflecting surface is provided. [Selection] Figure 2

Description

  The present invention relates to a vehicle air conditioner, and more particularly to a vehicle air conditioner in which measures for weight reduction and noise reduction are taken.

  In the vehicle air conditioner, there is a problem that noise generated by the blower passes through the air conditioning case and enters the vehicle interior from the blowout port of the blown air, thereby impairing the quietness of the vehicle interior. In order to solve this problem, a technique of providing a sound absorbing material in an air conditioning casing has been proposed (see, for example, Patent Document 1). A technique has been proposed in which a reflection wall that reflects noise that has entered a duct from a blower is provided on an intake duct that constitutes a seat air conditioning system (see, for example, Patent Document 2). A technique has been proposed in which the inner wall surface of a duct that guides the blown air to the air outlet in the vehicle compartment is formed in a staircase shape (see, for example, Patent Document 3).

  Although it is not a technology that reduces noise generated by the blower, the surface that faces the core surface of the evaporator of the air conditioning case is used as a technology to reduce noise caused by the separation flow generated in the diffuser part where the air flow path is enlarged. A technique for forming a stepped surface along the inflow direction has been proposed (see, for example, Patent Document 4).

JP 2000-85339 A JP 2006-130989 A JP 2001-294032 A JP 2009-61863 A

  However, the technique using the sound absorbing material as in Patent Document 1 has a problem of high cost. Moreover, weight reduction of the vehicle air conditioner is calculated | required. However, Patent Documents 1 to 4 do not take measures to reduce weight. In order to reduce the weight of the vehicle air conditioner, the case tends to be thinner. If the case is thin, noise generated by the blower is likely to be transmitted, and the quietness in the passenger compartment may be impaired. However, a technique for reducing noise while reducing the weight of the vehicle air conditioner is not known.

  An object of the present invention is to provide a vehicle air conditioner in which measures for weight reduction and noise reduction are taken.

A vehicle air conditioner according to the present invention includes a case having an air passage therein and a blower that supplies blown air to the air passage, wherein the air passage downstream of the blower is formed. A part of the inner wall surface of the wall is a reflection surface that reflects the noise of the blower toward the upstream side of the air passage, and (1) the thickness of the wall portion of the portion provided with the reflection surface is the reflection surface The condition of (1) is that the thickness of the wall of the portion provided with the surface connected to the surface is thicker, (2) the outer wall surface of the wall of the portion provided with the reflective surface is provided with a reinforcing rib. met or (1) and wherein the condition is satisfied in both (2).

  In the vehicle air conditioner according to the present invention, the reflecting surface is preferably a concave curved surface. The reflected sound can be more effectively concentrated on the noise generation source (blower), and the noise can be further reduced.

  In the vehicle air conditioner according to the present invention, it is preferable that the reflecting surface has a plurality of regions having different curvatures. Attenuation effect can be obtained for a wider range of frequencies.

  In the vehicle air conditioner according to the present invention, it is preferable that the plurality of reflecting surfaces and the surfaces connected to the reflecting surfaces are alternately arranged in a stepped manner, and the reflecting surfaces are not similar to each other. Attenuation effect can be obtained for a wider range of frequencies.

  In the vehicle air conditioner according to the present invention, the plurality of reflecting surfaces are concave curved surfaces, and are arranged in descending order of the maximum curvature of the cross-sectional shape in the width direction of the reflecting surface from the upstream side of the air passage. Preferably it is. Attenuation effect can be obtained for a wider range of frequencies.

The vehicle air conditioner according to the present invention preferably includes at least one of the following configurations (A) to (D). Noise can be reduced more efficiently.
(A) The said reflective surface is provided in the wall of the duct part provided between the ventilation part which has the said air blower, and the temperature harmony part arrange | positioned downstream of this ventilation part.
(B) The said reflective surface is provided in the opposing wall which opposes the suction surface of the heat exchanger for cooling arrange | positioned downstream of the said air blower.
(C) The said reflective surface is provided in the wall of the connection duct which guides the said ventilation air to the blower outlet in a vehicle interior.
(D) The vehicle air conditioner has a layout in which a blower unit having the blower and a temperature-conditioning unit arranged downstream of the blower unit are vertically arranged, and the reflective surface indicates a flow direction of the blown air. It is provided on the wall of the portion that changes from the direction from the front to the rear of the vehicle to the direction from the lower to the upper side of the vehicle.

  The present invention can provide a vehicle air conditioner in which measures for weight reduction and noise reduction are taken.

It is a mimetic diagram showing roughly an example of an air-conditioner for vehicles concerning this embodiment. It is the schematic which shows the 1st example of a reflective surface. It is a 1st example of XX sectional drawing of FIG. It is a 2nd example of XX sectional drawing of FIG. It is the schematic which shows the 1st example of the deformation | transformation form of the reflective surface shown in FIG. It is the schematic which shows the 2nd example of the deformation | transformation form of the reflective surface shown in FIG. It is the schematic which shows the modification of the 1st example of a reflective surface. It is the schematic which shows the 2nd example of a reflective surface. It is the schematic which shows the 3rd example of a reflective surface. It is the schematic which shows the 4th example of a reflective surface.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. The embodiments described below are examples of the present invention, and the present invention is not limited to the following embodiments. In the present specification and drawings, the same reference numerals denote the same components. Various modifications may be made as long as the effects of the present invention are achieved.

  FIG. 1 is a schematic view schematically showing an example of a vehicle air conditioner according to the present embodiment. FIG. 2 is a schematic diagram illustrating a first example of a reflecting surface. The vehicle air conditioner 1 according to the present embodiment is a vehicle air conditioner that includes a case 2 having an air passage 3 therein and a blower 22 that supplies blown air to the air passage 3. A part of the inner wall surface of the wall forming the air passage 3 is a reflection surface 51 (shown in FIG. 2) that reflects the noise of the blower 22 toward the upstream side of the air passage 3, and (1) the reflection surface 51 is provided. The wall thickness of the portion provided is thicker than the wall thickness of the portion provided with the surface 52 connected to the reflection surface. (2) The outer wall surface of the portion provided with the reflection surface 51 is reinforced. One or both of the conditions (1) and (2) in which ribs (not shown) are provided are satisfied. FIG. 2 shows a form that satisfies the condition (1). First, an embodiment that satisfies the condition (1) will be described.

  As shown in FIG. 1, the vehicle air conditioner 1 includes an intake section 10, a blower section 20, a temperature conditioning section 30, and an air distribution section 40, and is integrally formed with the case 2. The vehicle air conditioner 1 is, for example, a horizontal type having a layout in which the air blowing unit 20 and the temperature conditioning unit 30 are horizontally installed as shown in FIG. 1, or the air blowing unit 20 and the temperature conditioning unit 30 are vertically arranged. It may be a vertical installation type having a layout (not shown). The material of the case 2 is not particularly limited, and is, for example, a synthetic resin such as polypropylene, polyethylene, polystyrene, or ABS resin (acrylonitrile butyleneene copolymer). The air passage 3 is an internal space of the case 2.

  In the intake section 10, as shown in FIG. 1, an outside air introduction port 11 and an inside air introduction port 12 are opened in the case 2, and an inside / outside air switching door 15 is disposed in the case 2.

  As shown in FIG. 1, the blower unit 20 has a blower 22 disposed therein. The blower 22 is disposed downstream of the intake unit 10. The blower 22 includes, for example, a centrifugal multiblade fan 22a such as a sirocco fan or a turbo fan, and a motor 22b that drives the fan.

  As shown in FIG. 1, the temperature conditioning unit 30 has a cooling heat exchanger 31 disposed therein. The cooling heat exchanger 31 is disposed downstream of the blower 22 so that a refrigerant can flow as part of a refrigeration cycle (not shown), and cools the blown air as necessary. In the temperature harmony part 30, the heat exchanger 32 for heating and the air mix door 33 may be arrange | positioned downstream of the heat exchanger 31 for cooling. The heat exchanger 32 for heating, for example, is capable of circulating hot water warmed by exhaust heat from the engine, and heats the blown air as necessary. The air mix door 33 adjusts the ratio of air (cold air) that bypasses the heating heat exchanger 32 and the ratio of air (hot air) that passes through the heating heat exchanger 32.

  It is preferable that a duct 50 is connected between the air outlet 24 of the blower 20 and the inlet 34 of the temperature adjuster 30. The duct portion 50 forms a cylindrical air passage 3a such as a cylindrical shape or a rectangular tube shape. In FIG. 2, the duct portion 50 is shown in a form that goes upward as it goes downstream. However, the present invention is not limited to this, for example, a form that goes down as it goes downstream, or a form arranged horizontally. It may be.

  As shown in FIG. 1, the air distribution unit 40 includes a defrost opening 41, a vent opening 42, and a foot opening 43. The defrost opening 41 is connected to a defrost outlet (not shown) in the vehicle compartment indirectly or directly via the defrost duct 47. The vent opening 42 is connected to a vent outlet (not shown) in the vehicle compartment indirectly or directly via the vent duct 48. The foot opening 43 is connected to a foot outlet (not shown) in the vehicle compartment indirectly or directly via a foot duct 49. The defrost duct 47, the vent duct 48, and the foot duct 49 form a cylindrical air passage 3b such as a cylindrical shape or a rectangular tube shape. Each outlet (not shown) in the passenger compartment blows out the air whose temperature has been adjusted by the temperature adjusting unit 30 toward the passenger compartment. The opening degree of each opening 41, 42, 43 is adjusted by mode doors 44, 45, 46, respectively.

  The reflecting surface 51 is a part of the inner wall surface of the wall that forms the air passage 3 downstream of the blower 22. As shown in FIG. 2, the wall thickness of the portion where the reflection surface 51 is provided is thicker than the wall thickness of the portion where the surface 52 connected to the reflection surface 51 is provided. The vehicle air conditioner 1 is required to be reduced in weight, and the case 2 tends to be thinner in order to reduce the weight. If the thickness of the case 2 is too thin on the reflecting surface, noise generated by the blower is likely to be transmitted, and the quietness in the passenger compartment may be impaired. Therefore, the wall of the portion provided with the surface 52 connected to the reflecting surface 51 is not made thick but contributes to the thinning of the case 2. Further, the thickness of the case 2 is appropriately increased at the wall of the portion where the reflecting surface 51 is provided. As a result, the transmittance of the sound wave on the reflecting surface 51 can be reduced, and noise can be further reduced. Although the thickness of the wall of the part in which the reflective surface 51 was provided is not specifically limited, From a viewpoint of weight reduction of the vehicle air conditioner 1, it is 0.8-1.5 mm, for example. Although the thickness of the wall of the part in which the surface 52 connected to the reflective surface 51 was provided is not specifically limited, For example, it is 1.5-2.5 mm.

  FIG. 3 is a first example of the XX cross-sectional view of FIG. FIG. 4 is a second example of the XX cross-sectional view of FIG. The reflecting surface 51 may be a flat surface as shown in FIG. 3 or a curved surface as shown in FIG. Further, as shown in FIG. 2, the reflecting surface 51 may be formed by making the wall of the case 2 uneven, or may be formed by increasing the thickness of the wall of the case 2 (not shown). . The reflecting surface 51 is more preferably formed by making the wall of the case 2 concavo-convex in that the vehicle air conditioner 1 can be further reduced in weight. Moreover, the number of the reflective surfaces 51 may be singular or plural. In FIG. 2, an example in which there are three reflecting surfaces 51 is shown as an example.

  As shown in FIG. 2, the reflection surface 51 is preferably provided on the wall of the duct unit 50 provided between the air blowing unit 20 and the temperature conditioning unit 30 (hereinafter, sometimes referred to as a form (A)). . In the form A, for example, when the duct unit 50 is configured to go upward as it goes downstream as shown in FIG. 2, the noise generated in the blower 22 collides with the lower wall of the duct unit 50 and moves upward. Reflect towards The noise reflected upward is collided with the reflecting surface 51 and reflected toward the upstream side of the air passage 3. In this way, the reflected sound can be returned to the noise generation source (blower 22). As a result, it is possible to reduce noise transmitted from the air outlet (not shown) in the vehicle interior to the vehicle interior. It is preferable that the normal direction of the reflective surface 51 is toward the blower outlet 24 of the ventilation part 20 as for the reflective surface 51. FIG. The reflected sound can be more effectively concentrated on the noise generation source (blower 22), and the noise can be further reduced.

  When the duct portion 50 heads upward as it goes downstream, the reflecting surface 51 is more preferably provided on the inner wall surface 50 a on the upper side of the vehicle among the inner wall surfaces of the duct portion 50. The blown air blown from the blower 22 is directed to the inner wall surface 50b on the lower side of the vehicle among the inner wall surface of the duct portion 50, and most of the air passes along the inner wall surface 50b on the lower side. Here, by providing the uneven reflecting surface 51 on the upper inner wall surface 50a instead of the lower inner wall surface 50b, it is possible to prevent the ventilation resistance from increasing.

  The reflecting surface 51 preferably has an elongated shape whose height is shorter than the width. Here, the width of the reflective surface 51 refers to the length of the vehicle in the front-rear direction when the reflective surface 51 is provided on the upper inner wall surface of the case 2 as shown in FIG. In FIG. 2, the front-rear direction of the vehicle is a direction from the front surface to the back surface of FIG. The height of the reflecting surface 51 refers to the length in the direction orthogonal to the width direction of the reflecting surface 51.

  FIG. 5 is a schematic view showing a first example of a modification of the reflecting surface shown in FIG. The vehicle air conditioner 1 according to the present embodiment has a condition that, instead of the condition (1), (2) the reinforcing rib 53 is provided on the outer wall surface 61 of the wall portion where the reflecting surface 51 is provided. It is good also as a form filled. Here, the outer wall surface 61 is an outer wall surface of the case 2. By increasing the rigidity of the wall of the portion where the reflecting surface 51 is provided by the reinforcing ribs 53, the transmittance of sound waves can be reduced, the reflectance can be improved, and noise can be further reduced. The reinforcing rib 53 protrudes from the outer wall surface 61. As shown in FIG. 5, the thickness of the reflective surface 51 is made approximately the same as that of the surface 52 connected to the reflective surface 51, thereby contributing to weight reduction compared to the first example of the reflective surface shown in FIG. 2. Can do.

  The arrangement of the reinforcing ribs 53 is shown in FIG. 5 as an example in which the reinforcing ribs 53 are arranged along the height direction of the reflecting surface 51. However, it is only necessary to increase the rigidity of the wall of the portion where the reflecting surface 51 is provided. The invention is not limited to the arrangement of the reinforcing ribs 53. FIG. 6 is a schematic diagram showing a second example of a modification of the reflecting surface shown in FIG. For example, the reinforcing ribs 54 may be arranged in a lightning bolt shape or a zigzag shape as shown in FIG.

  The reinforcing ribs 53 and 54 may be formed integrally with the case 2 or may be separate. When the reinforcing ribs 53 and 54 are formed separately from the case 2, the reinforcing ribs 53 and 54 may be formed of the same material as that of the case 2 or may be formed of a material different from the material of the case 2. By manufacturing the case 2 by injection molding and forming the reinforcing ribs 53 and 54 integrally with the case 2, the reinforcing ribs 53 and 54 can be formed on the case 2 without adding a process.

  In this embodiment, it is good also as a form which satisfy | fills both conditions (1) and conditions (2). That is, the thickness of the wall of the portion provided with the reflective surface 51 is made thicker than the thickness of the wall of the portion provided with the surface 52 connected to the reflective surface 51 and the wall of the portion provided with the reflective surface 51 is provided. Reinforcing ribs 53 and 54 may be provided on the outer wall surface 61. For example, the reinforcing rib 53 or the reinforcing rib 54 is provided on the outer wall surface of the wall where the reflecting surface 51 shown in FIG. 2 is provided.

  The reflecting surface 51 is preferably a concave curved surface as shown in FIG. Here, the concave curved surface refers to a curved surface recessed in the downstream direction of the air passage 3. When the reflecting surface 51 is a curved surface, the cross-sectional shape in the width direction of the reflecting surface 51 is, for example, an arc shape, an elliptic arc shape, or a curved shape other than the arc shape and the elliptic arc shape. By making the reflecting surface 51 a curved surface, the reflected sound can be more effectively concentrated on the noise generation source (blower), and the noise can be further reduced.

  When the reflecting surface 51 is a curved surface, the reflecting surface 51 preferably has a plurality of regions with different curvatures. Attenuation effect can be obtained for a wider range of frequencies. In the form having a plurality of regions with different curvatures, for example, a region where the curvature is minimum is arranged at the center portion in the width direction of the reflecting surface 51, and regions where the curvature is larger than the center portion at both ends in the width direction. In this configuration, a region having the maximum curvature is disposed at the central portion in the width direction of the reflecting surface 51, and regions having a smaller curvature than the central portion are disposed at both end portions in the width direction. In the present embodiment, the form having a plurality of regions having different curvatures includes a form in which the curvature continuously changes, such as a form in which the cross-sectional shape in the width direction of the reflecting surface 51 is an elliptical arc.

  Even if the reflecting surface 51 is a curved surface, as shown in FIG. 2, the wall thickness of the portion where the reflecting surface 51 is provided is thicker than the thickness of the wall portion where the surface 52 connected to the reflecting surface 51 is provided. 5 or 6, reinforcing ribs 53 and 54 are provided on the outer wall surface 61 of the portion where the reflecting surface 51 is provided, or the wall thickness of the portion where the reflecting surface 51 is provided. May be thicker than the wall thickness of the portion where the surface 52 connected to the reflection surface 51 is provided, and reinforcing ribs 53 and 54 may be provided on the outer wall surface 61 of the wall where the reflection surface 51 is provided. .

  In the vehicle air conditioner 1 according to the present embodiment, as shown in FIG. 2, a plurality of reflecting surfaces 51 and surfaces 52 connected to the reflecting surfaces 51 are alternately arranged in a stepped manner, and the reflecting surfaces 51 are mutually connected. It is preferably a non-similar shape. Attenuation effect can be obtained for a wider range of frequencies. The combination of the plurality of reflection surfaces 51 is, for example, a combination of a planar reflection surface and a curved reflection surface, or a combination of curved reflection surfaces having different shapes. In the combination of curved reflecting surfaces having different shapes, for example, the plurality of reflecting surfaces 51 are arranged from the upstream side of the air passage 3 in the descending order of the maximum curvature of the cross-sectional shape in the width direction of the reflecting surface 51. Or a plurality of reflecting surfaces 51 are arranged from the upstream side of the air passage 3 in descending order of the maximum curvature of the transverse cross-sectional shape of the reflecting surface 51 in the width direction. More preferably, the plurality of reflecting surfaces 51 are arranged from the upstream side of the air passage 3 in descending order of the maximum curvature of the cross-sectional shape in the width direction of the reflecting surface 51. Attenuation effect can be obtained for a wider range of frequencies.

  FIG. 7 is a schematic view showing a modification of the first example of the reflecting surface. In the present embodiment, as shown in FIG. 7, the reflection surface 51 may be provided on the lower inner wall surface 50 b of the inner wall surfaces of the duct portion 50. Further, the reflection surface 51 may be provided in a plurality of directions on the inner wall surface of the duct portion 50. The form which provides the reflective surface 51 in the several direction of the inner wall face of the duct part 50 is a form provided in both the upper inner wall face 50a and the lower inner wall face 50b of the duct part 50, for example. Furthermore, the reflecting surface 51 may be provided on the inner wall surface on the front side of the vehicle and / or the inner wall surface on the rear side of the vehicle among the inner wall surfaces of the duct portion 50. In FIG. 7, the front-rear direction of the vehicle is a direction from the front surface to the back surface of FIG.

  Next, another form (form B-form D) of a reflective surface is demonstrated. The reflective surfaces of Forms B to D have the same basic structure as that of the reflective surface 51 of Form A, except that the reflective surfaces are different. For this reason, a description of the configuration common to the form A will be omitted, and a configuration different from that will be described.

  FIG. 8 is a schematic diagram illustrating a second example of the reflecting surface. In the present embodiment, it is preferable that the reflecting surface 51 is provided on the facing wall 35 that faces the suction surface 31a of the cooling heat exchanger 31 (hereinafter may be referred to as a form (B)). The facing wall 35 is a part of the wall of the case 2, and forms a bending passage 3 c with the suction surface 31 a of the cooling heat exchanger 31. The bending passage 3c is a part of the air passage 3, and changes the flow direction of the blown air from the blower 21 to a direction toward the suction surface 31a of the cooling heat exchanger 31. For example, when the flow direction of the blown air from the blower 21 is the direction from the left to the right of the vehicle, the direction toward the suction surface of the cooling heat exchanger 31 is the direction from the front to the rear of the vehicle.

  The reflecting surface 51 is preferably opposed to the surface Fa formed by the inlet 34 of the temperature conditioning unit 30. In the form B, the noise generated in the blower 22 that has entered the bending passage 3 c collides with the reflecting surface 51 and is reflected toward the upstream side of the air passage 3. In this way, noise can be suppressed from being transmitted downstream of the air passage. As a result, it is possible to reduce noise transmitted from the air outlet (not shown) in the vehicle interior to the vehicle interior. When the reflecting surface 51 is a flat surface, the reflecting surface 51 is preferably parallel to the surface Fa formed by the inlet 34 of the temperature conditioning unit 30. The reflected sound can be efficiently reflected toward the upstream side of the air passage 3, and the noise can be further reduced.

  FIG. 9 is a schematic view showing a third example of the reflecting surface. In the present embodiment, it is preferable that the reflecting surface 51 is provided on the wall of the connecting duct 48 that guides the blown air to the air outlet (air outlet) in the vehicle interior (hereinafter also referred to as form (C)). The connecting duct is, for example, a defrost duct 47, a vent duct 48, or a foot duct 49 shown in FIG. In FIG. 9, the form which is a vent duct was shown as an example.

  The reflective surface 51 is preferably opposed to the surface Fb formed by the vent opening 42. In the form C, the noise generated in the blower 22 that has entered the air passage 3 b in the connection duct (vent duct) 48 collides with the reflecting surface 51 and is reflected upstream of the air passage 3. In this way, noise can be suppressed from being transmitted downstream of the air passage. As a result, it is possible to reduce noise transmitted from the air outlet (not shown) in the vehicle interior to the vehicle interior. When the reflecting surface 51 is a flat surface, the reflecting surface 51 is preferably parallel to the surface Fb formed by the vent opening 42. The reflected sound can be efficiently reflected toward the upstream side of the air passage 3, and the noise can be further reduced.

  FIG. 10 is a schematic diagram illustrating a fourth example of the reflecting surface. In the present embodiment, the vehicle air conditioner 100 has a layout in which the air blowing unit 20 and the temperature conditioning unit 30 are placed vertically, and the reflecting surface 51 moves the air flow direction from the front to the rear of the vehicle. It is preferable to be provided on the wall 36 of the portion that changes from the lower side to the upper side (hereinafter also referred to as form (D)). In FIG. 10, the flow direction of the blown air is indicated by a white arrow d. The wall 36 of the portion that changes the flow direction of the blown air from the direction from the front to the rear of the vehicle to the direction from the lower to the upper side of the vehicle is an opposing wall that faces the suction surface 32a of the heat exchanger 32 for heating. The facing wall 36 is a part of the wall of the case 2, and forms a bending passage 3 d with the suction surface 32 a of the heat exchanger 32 for heating. The bending passage 3d is a part of the air passage 3, and changes the flow direction of the blown air that has passed through the cooling heat exchanger 31 to a direction toward the suction surface 32a of the heating heat exchanger 32. The flow direction of the blown air that has passed through the cooling heat exchanger 31 is the direction from the front to the rear of the vehicle, and the direction toward the suction surface 32a of the heating heat exchanger 32 is the direction from the front to the rear of the vehicle. From the bottom to the top of the vehicle.

  The reflecting surface 51 is preferably opposed to the blowing surface 31 b of the cooling heat exchanger 31. In the form D, the noise generated in the blower 22 that has entered the bending passage 3d collides with the reflecting surface 51 and is reflected toward the upstream side of the air passage 3. In this way, noise can be suppressed from being transmitted downstream of the air passage 3. As a result, it is possible to reduce noise transmitted from the air outlet (not shown) in the vehicle interior to the vehicle interior. When the reflecting surface 51 is a flat surface, the reflecting surface 51 is preferably parallel to the blow-out surface 31b of the cooling heat exchanger 31. The reflected sound can be efficiently reflected toward the upstream side of the air passage 3, and the noise can be further reduced.

  Also in the forms B to D, similarly to the form A, the reflecting surface 51 may be a concave curved surface as shown in FIG. Further, as shown in FIGS. 5 and 6, reinforcing ribs 53 and 54 may be provided on the outer wall surface of the reflecting surface 51.

  Form A to Form D may be employed singly or in combination of two or more. Preferred examples of the combination are a combination of Form A and Form B, a combination with Form A and Form D, and a combination of Form A, Form B and Form D.

DESCRIPTION OF SYMBOLS 1 Vehicle air conditioner 2 Case 3 Air passage 3a Cylindrical air passage 3b Air passage 3c in connection duct Bending passage 3d Bending passage 10 Intake part 11 Outside air introduction port 12 Inside air introduction port 15 Inside / outside air switching door 20 Air blower 22 Blower 22a Centrifugal multi-blade fan 22b Motor 24 Blower outlet 30 Temperature conditioning unit 31 Cooling heat exchanger 31a Cooling heat exchanger suction surface 31b Cooling heat exchanger outlet surface 32 Heating heat exchanger 32a Suction surface 33 of heating heat exchanger 33 Air mix door 34 Inlet 35 of temperature conditioning section Opposing wall 36 Opposing wall 40 Air distribution section 41 Defrost opening section 42 Vent opening section 43 Foot opening sections 44, 45, 46 Mode door 47 Defrost duct 48 Vent duct 49 Foot duct 50 Duct portion 50a Inner wall surface 50b above the duct portion Inner wall below the duct portion Surface 51 Reflecting surface 52 Surface connected to the reflecting surface 53 Reinforcing rib 54 Reinforcing rib 61 Outer wall surface Fa Surface formed by the inlet of the temperature adjusting portion Fb Surface formed by the vent opening

Claims (6)

A case having an air passage inside,
In a vehicle air conditioner comprising a blower that supplies blown air to the air passage,
A part of the inner wall surface of the wall that forms the air passage downstream of the blower is a reflection surface that reflects the noise of the blower toward the upstream of the air passage,
(1) The wall thickness of the portion provided with the reflecting surface is thicker than the wall thickness of the portion provided with the surface connected to the reflecting surface.
(2) wherein the outer wall surface of the wall portion in which the reflective surface is provided, satisfying the condition is satisfied or both of (1) and (2) of the reinforcing ribs are provided, of (1) An air conditioner for a vehicle.   The vehicle air conditioner according to claim 1, wherein the reflecting surface is a concave curved surface.   The vehicle air conditioner according to claim 2, wherein the reflective surface has a plurality of regions having different curvatures. A plurality of reflective surfaces and surfaces connected to the reflective surfaces are alternately arranged in a stepped manner,
The vehicle air conditioner according to any one of claims 1 to 3, wherein the reflecting surfaces are non-similar to each other. The plurality of reflective surfaces are concave curved surfaces,
The vehicle air conditioner according to claim 4, wherein the vehicular air conditioner is arranged in descending order of the maximum curvature of the cross-sectional shape in the width direction of the reflecting surface from the upstream side of the air passage. The vehicle air conditioner according to any one of claims 1 to 5, comprising at least one of the following configurations (A) to (D).
(A) The said reflective surface is provided in the wall of the duct part provided between the ventilation part which has the said air blower, and the temperature harmony part arrange | positioned downstream of this ventilation part.
(B) The said reflective surface is provided in the opposing wall which opposes the suction surface of the heat exchanger for cooling arrange | positioned downstream of the said air blower.
(C) The said reflective surface is provided in the wall of the connection duct which guides the said ventilation air to the blower outlet in a vehicle interior.
(D) The vehicle air conditioner has a layout in which a blower unit having the blower and a temperature-conditioning unit arranged downstream of the blower unit are vertically arranged, and the reflective surface indicates a flow direction of the blown air. It is provided on the wall of the portion that changes from the direction from the front to the rear of the vehicle to the direction from the lower to the upper side of the vehicle.

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