WO2020080036A1

WO2020080036A1 - Blower and air conditioning device

Info

Publication number: WO2020080036A1
Application number: PCT/JP2019/037003
Authority: WO
Inventors: 智光長澤
Original assignee: 株式会社ヴァレオジャパン
Priority date: 2018-10-16
Filing date: 2019-09-20
Publication date: 2020-04-23

Abstract

[Problem] To provide a blower in which a resonance chamber is formed without accompanying an increase in size of the blower and a reduction in air flow passage of an air intake housing. [Solution] This blower (2) is provided with: an impeller (4); a scroll housing (6) that houses the impeller (4); an air intake housing (10) which is connected to the scroll housing (6) and has an external air intake port (11) and an internal air intake port (12); and switching doors (50, 55) which open/close the external air intake port (11) and the internal air intake port (12). The air intake housing (10) further has: an external air intake duct (20) having one opening section connected to the external air intake port (11); and a duct opening/closing door (25) which opens/closes the external air intake duct (20) at a position spaced apart from the external air intake port (11).

Description

Blower and air conditioner

The present invention relates to a blower and an air conditioner including the blower.

As a blower used in an air conditioner for a vehicle, one using an impeller is known. The impeller is arranged in a scroll housing having a suction port and a discharge port. Then, by rotating the impeller, the blower discharges air through the discharge port while taking in air into the scroll housing through the suction port. An air intake housing is connected to the suction port. The air intake housing has an inside air intake communicating with the interior of the vehicle, an outside air intake communicating with the outside of the vehicle, and a switching door for opening and closing the inside air intake and the outside air intake. Through such an air intake housing, the blower can take in the inside air (air inside the vehicle) or the outside air (air taken in from the outside of the vehicle). ‥

By the way, the above-described blower causes noise such as wind noise caused by the impeller. Therefore, it is required to prevent the noise from leaking into the vehicle cabin. In the blower described in Patent Document 1, noise is reduced by providing a resonance chamber adjacent to the air flow path of the air intake housing. ‥

However, in such a blower, the air intake housing (and thus the blower) is increased in size by the size of the resonance chamber, or the air flow path of the air intake housing is reduced, so that the air blower has a high blower capacity. Will fall.

JP-A-7-228128

An object of the present invention is to form a resonance chamber without increasing the size of a blower or reducing the air flow path of an air intake housing, and to suppress the leakage of noise into the vehicle interior.

According to a preferred embodiment of the present invention, a blower used in a vehicle air conditioner, which has a plurality of blades forming a circumferential blade row and is driven to rotate by a rotation shaft of a motor. A scroll housing having an internal space for accommodating the impeller, a suction opening that opens in the axial direction of the rotating shaft, and a discharge opening that opens in the circumferential direction of the impeller; and the suction of the scroll housing. An air intake housing having an internal space communicating with a mouth, wherein at least one external air intake for taking in external air into the internal space of the air intake housing and internal air in the internal space of the air intake housing At least one inside air intake for providing the air intake housing, and at least one opening for opening and closing the outside air intake and the inside air intake A door and a cylindrical outside air intake duct having openings at both ends, one opening is connected to the outside air intake, and the outside air intake is opposite from the internal space of the air intake housing. A blower is provided that has an outside air intake duct that extends to the side and a duct opening / closing door that opens and closes the outside air intake duct at a position separated from the outside air intake port. ‥

Alternatively, according to a preferred embodiment of the present invention, there is provided an air conditioner for a vehicle, which includes the above-described blower and an air conditioner that blows out the air sent from the blower into the interior of the vehicle.

According to the above-described embodiment of the present invention, it is possible to form the resonance chamber without enlarging the blower and reducing the flow path of the air in the air intake housing, and suppressing the leakage of noise into the vehicle interior. it can.

It is a figure which shows typically the structure of the air conditioning apparatus by one embodiment of this invention. It is a perspective view of the air blower shown in FIG. It is a figure which shows typically the cross section of the air blower shown in FIG. It is a figure which expands and shows the cross section of the air intake housing shown in FIG. 3, Comprising: It is a figure which shows the case where a switching door exists in a 1st position. It is a figure which shows the frequency characteristic curve of the noise obtained when using the air blower shown in FIG. 2, and when using the conventional air blower. It is a figure which shows the frequency characteristic curve of the noise obtained when operating an air conditioner in a foot mode and a vent mode. It is a figure corresponding to FIG. 1, and is a figure which shows typically the structure of the air conditioning apparatus by the modification 1 of this invention. It is a figure which shows the frequency characteristic curve of the noise obtained when the rotation speed of an impeller is high and when it is low. It is a figure corresponding to FIG. 1, and is a figure which shows typically the structure of the air conditioning apparatus by the modification 2 of this invention. It is a figure corresponding to FIG. 4, and is a figure which expands and shows the cross section of the air intake housing of the air blower by the modification 3 of this invention. It is a figure corresponding to FIG. 4, and is a figure which expands and shows the cross section of the air intake housing of the air blower by the modification 4 of this invention. It is a figure corresponding to FIG. 4, and is a figure which expands and shows the cross section of the air intake housing of the air blower by the modified example 5 of this invention.

An embodiment of the present invention will be described below with reference to the accompanying drawings. ‥

FIG. 1 is a diagram schematically showing the structure of an air conditioner according to an embodiment of the present invention. 2 and 3 are a perspective view of the blower shown in FIG. 1 and a diagram schematically showing a cross section of the blower shown in FIG. 2, respectively. FIG. 3 shows a cross section perpendicular to a turning axis Bx of the switching door and a rotation axis of the duct opening / closing door, which will be described later. FIG. 4 is an enlarged cross-sectional view of the air intake housing shown in FIG. 3, showing the case where the switching door is at the first position. Note that, for clarity of illustration, in FIGS. 2 and 3, illustration of a control device described later is omitted. Further, in FIG. 2, illustration of an impeller, a filter, etc. described later is omitted. In each drawing, U means the upper side of the vehicle, D means the lower side of the vehicle, Fr means the front side of the vehicle, Rr means the rear side of the vehicle, R means the right side of the vehicle, and L means the left side of the vehicle. However, the installation direction of the blower and the air conditioner described below with respect to the vehicle is not limited to the illustrated example. ‥

As shown in FIG. 1, an air conditioner 1 for a vehicle includes a blower 2 and an air conditioner 3 that blows the air sent from the blower 2 into the interior of the vehicle. ‥

As shown in FIGS. 1 and 3, the blower 2 has an impeller 4. The impeller 4 has a plurality of blades 4a that form a row of blades arranged in the circumferential direction on the outer peripheral portion thereof. The impeller 4 is connected to the rotating shaft 5a of the motor 5 and is driven to rotate about the rotation axis Ax, and sucked into the space inside the blade row of the impeller 4 from the upper side in the axial direction (one end side in the axial direction). Blows air out radially. ‥

In this specification, for convenience of description, the direction of the rotation axis Ax of the motor 5 and the impeller 4 is referred to as “axial direction”. In the following description, the explanation will be made on the premise that the axial direction matches the vertical direction, but it should be noted that the air conditioner may be incorporated in the vehicle so that the axial direction forms an angle with the vertical direction. Should be. In the present specification, unless otherwise noted, the direction of the radius of a circle drawn on a plane orthogonal to the rotation axis Ax centering on an arbitrary point on the rotation axis Ax is called the radial direction, and The circumferential direction is called the circumferential direction or the circumferential direction. ‥

As shown in FIG. 3, the impeller 4 includes a cone portion (inner deflection member) 4b integrally formed with the impeller 4. The cone portion 4b is a rotating body in a geometric sense. The rotating shaft 5a of the motor 5 is connected to the impeller 4 at the center of the cone portion 4b. In the air conditioner 1 shown in FIG. 1, the rotation speed of the motor 5 is controlled by the motor controller 8a. ‥

As shown in FIG. 1, the impeller 4 is housed inside a scroll housing 6. As shown in FIG. 2 and FIG. 3, the scroll housing 6 has a suction port 6a that opens upward in the axial direction and a discharge port 6b. When the scroll housing 6 is viewed from the axial direction, the discharge port 6b extends substantially tangentially to the outer peripheral surface of the scroll housing 6. ‥

As shown in FIG. 1, the blower 2 also has an air intake housing 10 connected to the scroll housing 6. The internal space of the air intake housing 10 communicates with the suction port 6 a of the scroll housing 6. As shown in FIG. 2, the air intake housing 10 has an outside air intake 11 that is open substantially forward and an inside air intake 12 that is open approximately rearward. The inside air intake 12 may be directed toward the left and right sides or may be open. A cylindrical outside air intake duct 20 having openings at both ends is connected to the outside air intake 11. The outside air intake duct 20 is connected to the outside air intake 11 at one opening 21 thereof, and extends from the outside air intake 11 to the side opposite to the internal space of the air intake housing 10 (generally forward and upward). There is. The outside air intake duct 20 may be integrated with the air intake housing 10, as shown in FIG. The other opening 22 of the outside air intake duct 20 is connected to an outlet (not shown) of an outside air introduction passage provided in the vehicle or is near the outlet. Through the outside air intake duct 20, outside air (air taken in from the outside of the vehicle) can be efficiently introduced into the air intake housing 10. The inside air intake 12 is open to the inside of the vehicle, and the inside air (air inside the vehicle) can be introduced into the air intake housing 10. ‥

A switching door 50 that opens and closes the outside air intake 11 and the inside air intake 12 is provided in the air intake housing 10. In the illustrated example, the switching door 50 is of a type called a rotary door and, as can be understood from FIG. 2, has a columnar shape having a fan-shaped bottom surface as a whole. The switching door 50 has a peripheral surface 51 having an arcuate cross section centered on the turning axis Bx, and fan-shaped side surfaces 52 connected to both left and right sides of the peripheral surface 51. By closing the outside air intake 11 (inside air intake 12) with the peripheral surface 51, the outside air intake 11 (inside air intake 12) is closed. The switching door 50 can be swung by an actuator (not shown) about a swivel axis Bx extending in the left-right direction, and opens the inside air intake 12 at the first position (see FIG. 4) and the outside air intake 11 to open the inside air. It is movable between a second position (see FIG. 3) that closes the intake 12. ‥

When the blower 2 is operated in the inside air mode, the switching door 50 is arranged at the first position as shown in FIG. At this time, the inside air AR is introduced into the air intake housing 10 from the inside air inlet 12. When the blower 2 is operated in the outside air mode, the switching door 50 is arranged at the second position as shown in FIG. At this time, the outside air AE is introduced into the air intake housing 10 from the outside air intake 11. The inside air AR introduced into the air intake housing 10 from the inside air inlet 12 and the outside air AE introduced into the air intake housing 10 from the outside air inlet 11 are discharged from the suction port 6a of the scroll housing 6 to the impeller 4. It flows into the space radially inward of the blade row. ‥

Between the region of the air intake housing 10 where the outside air intake 11 and the inside air intake 12 are provided, and the lower end of the air intake housing 10 (the end connected to the suction port 6a of the scroll housing 6). In addition, a filter 13 is provided for removing contaminants such as dust and particles contained in the air and offensive odors. The filter 13 is inserted into a filter support portion 14 formed of a slot or a rail provided in the air intake housing 10 and is held at a position close to the suction port 6 a of the scroll housing 6. ‥

Next, the air conditioner 3 will be described with reference to FIG. The air conditioning unit 3 has an air conditioning case 30 that forms an air passage 3a through which air flows. An inlet 31 connected to the outlet 6b of the blower 2 is formed at the upstream end (the left end in FIG. 1) of the air conditioning case 30, and the air sent from the blower 2 is conditioned through the inlet 31. It is designed to flow into the air passage 3a of the case 30. Further, a plurality of

outlet passages

32a, 32b, 32c are formed at the downstream end portion (the right end portion in FIG. 1) of the air conditioning case 30, and the air flowing into the air passage 3a receives the

outlet passages

32a, 32b, 32b. It is designed to flow out from 32c. ‥

The plurality of

outlet passages

32a, 32b, 32c of the air conditioning case 30 are
It includes a foot outlet passage 32a, a vent outlet passage 32b, and a defrost outlet passage 32c. As shown in FIG. 1, the foot outlet passage 32a is provided in a lower portion of the downstream end surface 33a of the air conditioning case 30. The downstream end of the foot outlet passage 32a is connected to a foot outlet (not shown) that blows air toward the feet of an occupant sitting in the driver's seat and the passenger seat (and in some cases, the rear seat). Further, the vent outlet passage 32b is provided in an upper portion of the downstream end surface 33a of the air conditioning case 30. The downstream end of the vent outlet passage 32b is connected to a vent outlet (not shown) that blows air toward the upper half of the occupant sitting in the driver's seat and the passenger seat (also in the rear seat in some cases). The defrost outlet passage 32c is provided on the top surface 33b of the air conditioning case 30. The downstream end of the defrost outlet passage 32c is connected to a defrost outlet (not shown) that blows air toward the inner surface of the windshield in the vehicle compartment.

Inside the air passage 3a of the air conditioning case 30, a cooling heat exchanger (evaporator) 35, a heating heat exchanger 36, and various doors (air mix door 7) for changing the flow of air flowing through the air passage 3a. And

outlet passage doors

38a, 38b, 38c) are provided. ‥

The cooling heat exchanger 35 is provided so that all of the air flowing into the air conditioning case 30 passes through the cooling heat exchanger 35. The cooling heat exchanger 35 removes heat from the air passing therethrough, and when the humidity of the air is high, the moisture in the air is condensed to reduce the humidity of the air. ‥

The heat exchanger 36 for heating is a detour between the inner side surface 33c of the air conditioning case 30 (above the heat exchanger 36 for heating in the example shown in FIG. 1) in the air passage 3a formed by the air conditioning case 30. It is arranged so as to form 3b. ‥

The air mix door 7 is provided between the cooling heat exchanger 35 and the heating heat exchanger 36. In the illustrated example, the air mix door 7 is a plate-shaped member and is arranged substantially parallel to the upstream surface of the heating heat exchanger 36. The air mix door 7 can slide in the air passage 3a in the vertical direction, and the opening degree of the bypass 3b can be adjusted by changing its position. Then, the air mix door 7 adjusts the ratio of the air directed to the heating heat exchanger 36 and the air directed to the bypass 3b, depending on the position. ‥

As shown in FIG. 1, each of the air mix doors 7 is connected to a shaft 7s that extends in the air passage 3a in the left-right direction. By rotating the shaft 7s, the air mix door 7 moves in the up-down direction. You can slide along. More specifically, a rack (not shown) is provided on one surface of each air mix door 7 from the upper edge to the lower edge. In addition, a pinion that meshes with the rack is provided on the outer peripheral surface of each shaft 7s. Then, when the shaft 7s is rotated in the circumferential direction, the rotational motion of the shaft 7s is converted into a vertical motion by the pinion and the rack, and the air mix door 7 slides up and down. The shaft 7s is directly or indirectly driven to rotate by an actuator (not shown). ‥

As shown in FIG. 1, the blow-out

passage doors

38a, 38b, 38c are provided in the above-mentioned blow-out

passages

32a, 32b, 32c, respectively, and open and close the blow-out

passages

32a, 32b, 32c. Specifically, the foot outlet passage 32a is provided with a foot outlet passage door 38a, the vent outlet passage 32b is provided with a vent outlet passage door 38b, and the defrost outlet passage 32c is provided with a defrost outlet passage door 38c. There is. In the illustrated example, the

outlet passage doors

38a, 38b, 38c are plate-shaped members and extend from shafts 38as, 38bs, 38cs extending in the left-right direction. Then, when the shafts 38as, 38bs, 38cs are rotated in the circumferential direction, the blow-out

passage doors

38a, 38b, 38c rotate about the rotation axes of the shafts 38as, 38bs, 38cs, and the corresponding blow-out

passages

32a, 32b, 38b. 32c can be opened and closed. The shafts 38as, 38bs, 38cs are rotationally driven directly or indirectly by an actuator (not shown). ‥

The

blowout passage doors

38a, 38b, 38c open or close the

corresponding blowout passages

32a, 32b, 32c according to the operation mode (blowing mode) of the air conditioner 1. For example, when the air conditioner 1 is operated in the foot mode, the foot outlet passage 32a is opened, the defrost outlet passage 32c is opened and squeezed, and the vent outlet passage 32b is closed. Further, when the air conditioner 1 is operated in the vent mode, the vent outlet passage 32b is opened and the foot outlet passage 32a and the defrost outlet passage 32c are closed. ‥

In the example shown in FIG. 1, the air conditioner 1 further controls the door in the air conditioning case that controls the actuator that rotationally drives the shaft 7s of the air mix door 7 and the shafts 38as, 38bs, 38cs of the

outlet passage doors

38a, 38b, 38c. It has a part 8b. The air-conditioning case inner door control unit 8b may be configured integrally with the motor control unit 8a. ‥

By the way, a blower using an impeller causes noise such as wind noise caused by the impeller. Therefore, for such a blower and an air conditioner using the blower, it is required to suppress the noise from leaking into the vehicle interior. As a method of suppressing the above noise from leaking into the vehicle compartment, a method is known in which a resonance chamber is provided adjacent to the air flow path of the air intake housing and the energy of the noise is attenuated in the resonance chamber. However, in this case, the air intake housing (and hence the blower) is enlarged by the size of the resonance chamber, or the air flow path of the air intake housing is reduced by the amount of the resonance chamber, and the blower's blowing capacity is reduced. Will decrease. ‥

In consideration of the above circumstances, the illustrated blower 2 and air conditioner 1 are not accompanied by the enlargement of the air intake housing 10 or the blower 2 or the reduction of the air flow path of the air intake housing 10. A device for forming a resonance chamber to prevent the noise from leaking into the vehicle cabin has been devised. ‥

First, when the blower 2 is operated in the inside air mode, the inside air intake 12 that opens inside the vehicle as described above is opened (see FIG. 4). On the other hand, when the blower 2 is operated in the outside air mode, the outside air intake 11 that opens toward the outlet of the outside air introduction passage provided in the vehicle is opened, while the inside air intake 12 is closed (Fig. 3). Therefore, the noise tends to reach the passenger compartment of the vehicle through the inside air intake 12 more when the blower 2 is operated in the outside air mode than when it is operated in the outside air mode. Therefore, if the noise obtained when the blower 2 is operated in the inside air mode is reduced, the noise leaking into the interior of the vehicle can be significantly suppressed. In consideration of this point, in the illustrated blower 2, when the blower 2 is operated in the inside air mode, the resonance chamber S is formed by utilizing the internal space of the outside air intake duct 20. ‥

Specifically, the outside air intake duct 20 is provided with a duct opening / closing door 25 that opens and closes the outside air intake duct 20 at a position separated from the outside air intake 11. Then, when the blower 2 is operated in the inside air mode, the outside air intake duct 20 is closed by the duct opening / closing door 25, and the first position of the switching door 50 is opened by partially opening the outside air intake 11. The resonance chamber S can be formed inside the outside air intake duct 20 by arranging the internal space of the intake duct 20 and the internal space of the air intake housing 10 to communicate with each other. That is, when the blower 2 is operated in the inside air mode, the space surrounded by the outside air intake duct 20, the duct opening / closing door 25, and the switching door 50 is used as the resonance chamber S. Then, the resonance chamber S is used to reduce the noise generated by the blower 2. ‥

When the blower 2 is operated in the inside air mode, the outside air intake 11 is partially opened as described above, but the outside air intake duct 20 is closed by the duct opening / closing door 25. The outside air is prevented from flowing into the air intake housing 10 through 11. As a result, when the blower 2 is operated in the inside air mode, it is possible to prevent a decrease in the air conditioning effect of the air conditioner 1 due to the outside air being mixed into the inside air. ‥

As described above, when the blower 2 is operated in the inside air mode, the resonance chamber S can be formed without increasing the size of the air intake housing 10 and the blower 2 by utilizing the internal space of the outside air intake duct 20. it can. Even if the internal space of the outside air intake duct 20 is used as the resonance chamber S, the flow path of the inside air flowing into the internal space of the air intake housing 10 through the inside air inlet 12 is not reduced, so that the blower 2 has a blowing capacity. There is no fear that it will decrease. Further, when the blower 2 is operated in the inside air mode, the outside air intake 11 is partially opened, but since the outside air intake duct 20 is closed by the duct opening / closing door 25, the outside air may flow into the blower 2. Is prevented, and the reduction of the air conditioning effect of the air conditioner 1 due to the mixing of outside air with the inside air is also prevented. As described above, according to the blower 2 of the present embodiment, by simply attaching the duct opening / closing door 25 to the outside air intake duct 20, noise can easily leak into the interior of the vehicle while the air blower 2 is operating in the inside air mode. The resonance chamber S is formed and emitted by the blower 2 without increasing the size of the inlet housing 10 or the blower 2 or reducing the air flow path of the air intake housing 10 and without impairing the air conditioning effect of the air conditioner 1. Noise can be reduced, and as a result, noise can be suppressed from leaking into the vehicle interior. ‥

In the illustrated example, the duct opening / closing door 25 is a plate-shaped member and extends from the shaft 25s extending in the left-right direction. When the shaft 25s is rotated in the circumferential direction, the duct opening / closing door 25 rotates around the rotation axis of the shaft 25s to open / close the outside air intake duct 20. The shaft 25s is rotationally driven by an actuator (not shown). ‥

Further, in the illustrated example, the blower 2 further includes a control device 60 that controls the duct opening / closing door 25 and the switching door 50. Specifically, the control device 60 controls an actuator that rotationally drives the shaft 25s of the duct opening / closing door 25 and an actuator that swivels the switching door 50. When arranging the switching door 50 in the first position, the control device 60 arranges the duct opening / closing door 25 in a position (position shown in FIG. 4) that closes the outside air intake duct 20. Accordingly, as described above, when the blower 2 is operated in the inside air mode, outside air is prevented from flowing into the air intake housing 10 through the partially opened outside air intake 11. Here, the control device 60 may be configured integrally with either or both of the air conditioning case inner door control unit 8b and the motor control unit 8a. ‥

By the way, while the vehicle is traveling, outside air tries to flow into the vehicle through an outlet of an outside air introduction path provided in the vehicle. The air pressure applied to the front surface of the vehicle while the vehicle is traveling is also called ram pressure. When the blower 2 is operated in the outside air mode, the outside air intake duct 20 and the outside air intake 11 of the blower 2 are largely open, and the inside of the outside air intake duct 20 is derived from the drive of the motor 5 and the impeller 4. In addition to the flowing air, the air flowing in according to the ram pressure also flows. Even if the duct opening / closing door 25 is rotated to close the outside air intake duct 20 in this state, the duct opening / closing door 25 receives air resistance due to the air flow formed in the outside air intake duct 20 and easily rotates. I can't. Therefore, when the operation of the blower 2 is switched from the outside air mode to the inside air mode while the vehicle is traveling, the outside air intake duct 20 may not be closed by the duct opening / closing door 25. ‥

In consideration of this point, the control device 60 controls the

doors

25 and 50 as follows. That is, as shown in FIG. 4, the control device 60 controls the switching door 50 so that the switching door 50 is arranged at the first position and the duct opening / closing door 25 is arranged at the position for closing the outside air intake duct 20. And when controlling the duct opening / closing door 25, after controlling the switching door 50,
The duct opening / closing door 25 is controlled. Thereby, most of the outside air intake 11 is closed before the duct opening / closing door 25 is rotated to close the outside air intake duct 20, and the flow rate of the air flowing through the outside air intake duct 20 per unit time is reduced. Will be reduced. Therefore, the air resistance received by the duct opening / closing door 25 when the duct opening / closing door 25 is rotated is also reduced, and the duct opening / closing door 25 can be easily rotated. The switching door 50 is preferably a rotary door as shown in FIG. When the airflow flowing in the outside air intake duct 20 includes air derived from the ram pressure in addition to the air derived from the drive of the motor 5 and the impeller 4, that is, the amount of ventilation in the outside air intake duct 20 is large. Even in this case, if the switching door 50 is a rotary door type, the rotation direction of the switching door 50 is orthogonal to the air flow in the outside air intake duct 20, and therefore the switching door 50 is operated by the air flow. Power does not change.

Next, with reference to FIG. 5, a difference in sound pressure level (SPL) of noise generated when the blower 2 according to the present embodiment and the conventional blower is operated in the inside air mode will be described. The conventional blower for comparison has the same configuration as the blower 2 according to the present embodiment, except that the duct opening / closing door 25 is not provided. In the example shown in FIG. 5, both the blower 2 according to the present embodiment and the conventional blower were operated in the inside air mode. However, in the conventional blower, the outside air intake is completely closed by the switching door in order to prevent outside air from flowing into the blower. On the other hand, in the blower 2 of the present embodiment, the outside air intake 11 is partially opened and the outside air intake duct 20 is closed by the duct opening / closing door 25. FIG. 5: is a figure which shows the frequency characteristic of the noise obtained in the vicinity of the internal air intake of each blower operated on such conditions. The horizontal axis represents frequency, and the vertical axis represents the A characteristic sound pressure level of the 1/3 octave bandwidth filter. ‥

As shown in FIG. 5, in the blower 2 according to the present embodiment, the sound pressure level of noise is significantly reduced in the frequency band of 315 to 1000 Hz, and in the frequency band of 100 to 12500 Hz, as compared with the conventional blower. The overall value of sound pressure level is also reduced. From this, it is understood that the blower 2 according to the present embodiment produces less noise in the vicinity of the inside air intake 12 than the conventional blower. Further, when the amount of air per hour pushed out from the discharge port of the scroll housing of the blower 2 according to the present embodiment and the conventional blower was measured, both were 480 m ^{3 /} hour. This means that the blower 2 according to the present embodiment has a blowing capacity equivalent to that of the conventional blower. As described above, according to the blower 2 according to the present embodiment, noise is reduced without increasing the size of the blower or reducing the air flow path of the air intake housing, and without impairing its blowing ability. be able to.

By the way, the resonance frequency of the resonance chamber as described above (the frequency of the sound silenced in the resonance chamber) is generally expressed by the following equation. Here, f is a resonance frequency (frequency of sound muffled in the resonance chamber), c is a sound velocity, A is an opening area of an opening of the resonance chamber, V is a volume of the resonance chamber, and L is a length of the opening.

The opening area A of the opening of the resonance chamber S corresponds to the opening area of the outside air intake 11. Therefore, in the case of the blower 2 of the present embodiment, if the first position of the switching door 50 is changed and the opening area of the outside air intake 11 is changed, the frequency of the sound silenced in the outside air intake duct 20 (silence frequency). ) Can be changed. That is, according to the blower 2 of the present embodiment, the sound of the desired frequency can be silenced by changing the first position of the switching door 50. For example, as shown in FIG. 5, among the noises obtained by the conventional blower, the sound of the frequency having the maximum sound pressure level (sound near 630 Hz) is reliably adjusted by adjusting the first position of the switching door 50. Can be muted to. Furthermore, by changing the first position of the switching door 50, it is possible to arbitrarily change the frequency of the sound that is silenced in the resonance chamber S. ‥

For example, when the air conditioner having the conventional blower described above was operated in the foot mode and the vent mode and the noise obtained near the inside air intake of the blower was measured, the results shown in FIG. 6 were obtained. In the example shown in FIG. 6, the conventional blower is operated in the inside air mode, and the outside air intake is completely closed by the switching door in order to prevent outside air from flowing into the blower. FIG. 6 is a diagram showing a frequency characteristic of noise obtained in the vicinity of the inside air intake port of a conventional blower operated under such conditions. The horizontal axis represents frequency, and the vertical axis represents the A characteristic sound pressure level of the 1/3 octave bandwidth filter. ‥

As shown in FIG. 6, in the vent mode, the frequency characteristic curve forms a gentle peak as a whole over the frequency band of 63 to 10000 Hz. In the case of noise having such a frequency characteristic, the noise can be effectively reduced by silencing the sound of the frequency having the maximum sound pressure level (sound near 630 Hz in the example shown in FIG. 6). On the other hand, as can be understood from FIG. 6, in the foot mode, the frequency characteristic curve forms a sharp peak near 130 Hz, and in other frequency bands, forms a gentle peak as a whole. In the case of noise having such frequency characteristics, a sound near 130 Hz at which a sound pressure level forms a sharp peak is perceived as an offensive sound. Therefore, if the sound near 130 Hz is silenced, the noise can be effectively reduced. ‥

As described above, depending on the operation mode of the air conditioner, more specifically, which blowout passage is opened, or the blowout passage that is movable between the opening position and the closing position of the corresponding blowout passage. The frequency of the sound to be muted differs depending on the position of the passage door. Even if the frequency of the sound to be muted differs depending on the operation mode of the air conditioner and the like, according to the blower 2 of the present embodiment, by changing the first position of the switching door 50, the resonance chamber is changed. The frequency of the sound muted by S can be arbitrarily changed. ‥

Then, in the example shown in FIG. 1, the control device 60 determines the first position of the switching door 50 according to the position of at least one of the

outlet passage doors

38a, 38b, 38c in consideration of the result shown in FIG. To do. Then, when the blower 2 is operated in the inside air mode, the switching door 50 is arranged at the determined first position. ‥

Specifically, as shown in FIG. 6, when the air conditioner 1 is operated in the vent mode and in the foot mode, the frequency of the sound to be silenced is lower in the foot mode. Therefore, the control device 60 of the present embodiment operates the outside air intake 11 when the switching door 50 is arranged at the first position when the air conditioner 1 is operated in the foot mode rather than in the vent mode. The first position is determined so that the opening area becomes small. In other words, it is movable between the foot outlet passage 32a, the upper outlet passage (vent outlet passage) 32b provided above the foot outlet passage 32a, and the position where the foot outlet passage 32a is opened and closed. In an air conditioner 1 including a foot outlet passage door 38a and an upper outlet passage door (vent outlet passage door) 38b movable between a position where the upper outlet passage (vent outlet passage) 32b is opened and a position where the upper outlet passage 32b is closed. The controller 60 is located at a position where the foot outlet passage door 38a closes the foot outlet passage 32a, and the upper outlet passage door (vent outlet passage door) 38b opens the upper outlet passage (vent outlet passage) 32b. The foot outlet passage door 38a is located at a position where the foot outlet passage 32a is opened, and the upper outlet passage door 3 is opened. When b is at a position that closes the upper outlet passage (vent outlet passage) 32b, the first position is set so that the opening area of the outside air intake 11 when the switching door 50 is arranged at the first position becomes small. decide. As a result, as understood from the above-described formula, the sound is suppressed in the resonance chamber S when operating in the foot mode rather than the frequency of the sound which is suppressed in the resonance chamber S when operating the air conditioner 1 in the vent mode. It is possible to lower the sound frequency. ‥

In the example shown in FIG. 1, the control device 60 determines the positions of the blow-out

passage doors

38a, 38b, 38c (the blow-out

passage doors

38a, 38b, 38c based on the information obtained from the air-conditioning case inside door control unit 8b). It is determined whether the

corresponding outlet passages

32a, 32b, 32c are in the open position or the closed position), and the first position of the switching door 50 is determined. When the control device 60 and the air-conditioning case interior door control unit 8b are integrally configured as a combined control device (not shown), the combined control device indicates the position of the

blowout passage doors

38a, 38b, 38c. The first position of the switching door 50 is determined based on the information. ‥

The difference in the frequency of the sound to be silenced due to the difference in the operation mode shown in FIG. 6 is also understood to be due to the difference in the arrangement of the air mix doors. That is, in general, the air mix door is arranged so as to maximize the opening area of the bypass between the heat exchanger for heating and the inner surface of the air conditioning case when the air conditioner is operated in the vent mode. On the other hand, when operating in the foot mode, it is arranged so as to minimize the opening area of the bypass. Also in the example shown in FIG. 6, the air mix door is arranged so as to maximize the opening area of the bypass when operating in the vent mode, and minimizes the opening area of the bypass when operating in the foot mode. Was arranged to. Therefore, FIG. 6 is arranged to minimize the opening area when the air mix door is arranged so as to maximize the opening area of the detour and when it is arranged so as to minimize the opening area. It can be understood that the case where the noise is suppressed indicates that the frequency of the sound to be silenced is lower. ‥

In consideration of this point, the control device 60 may determine the first position of the switching door 50 according to the position of the air mix door 7. In other words, the control device 60 controls the outside air intake port 11 when the switching door 50 is arranged in the first position when the air mixing door 7 is in the closed position rather than in the opening position. The first position may be determined so that the opening area of the. As a result, as understood from the above formula, when the air mix door 7 is arranged so as to maximize the opening area of the detour 3b, the detour is more than the frequency of the sound silenced in the resonance chamber S. When arranged so as to minimize the opening area of 3b, it is possible to lower the frequency of the sound that is silenced in the resonance chamber S. ‥

In this case, the control device 60 is located at the position of the air mix door 7 (the position where the air mix door 7 maximizes the opening area of the detour 3b) based on the information obtained from the air conditioning case interior door control unit 8b. Or whether it is in the position to be minimized). Further, when the control device 60 and the air-conditioning case interior door control unit 8b are integrally configured to be a combined control device, the combined control device may change the switching door based on the instruction information of the position of the air mix door 7. A first position of 50 may be determined. ‥

Further, it can be understood that the difference in frequency of the sound to be silenced due to the difference in operation mode shown in FIG. 6 is due to the difference in ventilation resistance in the air conditioning case. That is, as described above, in the example shown in FIG. 6, when the air conditioner is operated in the vent mode, the air mix door is arranged so as to maximize the opening area of the bypass, so that the ventilation resistance in the air conditioning case is increased. However, when operating in foot mode, the air mix door was placed so as to minimize the opening area of the above detour, so the ventilation resistance inside the air conditioning case became relatively high. . Therefore, it can be understood that FIG. 6 shows that, when the ventilation resistance in the air conditioning case is low and when it is high, the frequency of sound to be silenced is lower when the ventilation resistance is higher. . ‥

In consideration of this point, in the control device 60, the higher the ventilation resistance in the air conditioning case 30, or the higher the ventilation resistance received by the air flowing out from the discharge port 6b of the scroll housing 6, the more the switching door 50 is in the first position. The first position may be determined so that the opening area of the outside air intake 11 when arranged in the above is small. As a result, as understood from the above equation, the higher the ventilation resistance, the lower the frequency of the sound muffled in the resonance chamber S can be.

In the embodiment described above, the blower 2 used in the air conditioner 1 for a vehicle has a plurality of blades 4a forming a circumferential blade row, and is driven by a rotating shaft 5a of a motor 5 to rotate the impeller. Have four. Further, the blower 2 has a scroll housing 6 having an internal space for accommodating the impeller 4, a suction port 6a opening in the axial direction of the rotating shaft 5a, and a discharge port 6b opening in the circumferential direction of the impeller 4. have. Further, the blower 2 has an air intake housing 10 having an internal space communicating with the suction port 6 a of the scroll housing 6. The air intake housing 10 has at least one outside air intake 11 for taking in outside air into the internal space of the air intake housing 10, and at least one inside air intake for taking in internal air into the internal space of the air intake housing 10. An inlet 12 is provided. Further, the blower 2 has at least one switching door 50 that opens and closes the outside air intake 11 and the inside air intake 12. The air intake housing 10 is a cylindrical outside air intake duct 20 having openings at both ends, one opening 21 is connected to the outside air intake 11, and the air intake is introduced from the outside air intake 11. The housing 10 has an outside air intake duct 20 extending to the side opposite to the internal space, and a duct opening / closing door 25 that opens and closes the outside air intake duct 20 at a position separated from the outside air intake 11. ‥

The noise generated by the blower 2 easily leaks into the room when the blower 2 is operated in the inside air mode, but according to the blower 2 described above, when the blower 2 is operated in the inside air mode, the noise is generated inside the outside air intake duct 20. By forming the resonance chamber S, the noise can be reduced, and the leakage of noise into the vehicle interior can be suppressed. Specifically, when the blower 2 is operated in the inside air mode, the outside air intake duct 20 is closed by the duct opening / closing door 25, and the switching door 50 is arranged so that the outside air intake 11 is partially opened. The space surrounded by the outside air intake duct 20, the duct opening / closing door 25, and the switching door 50 can be used as the resonance chamber S. Since the internal space of the outside air intake duct 20 is used as the resonance chamber S, it is possible to prevent the air intake housing 10 or the blower 2 from increasing in size. In addition, even when the internal space of the outside air intake duct 20 is used as the resonance chamber S when the blower 2 is operated in the inside air mode, the flow path of the internal air flowing into the internal space of the air intake housing 10 through the internal air intake port 12. Is not reduced. Therefore, there is no fear that the blowing capacity of the blower 2 will decrease. Further, even when the outside air intake 11 is partially opened when the blower 2 is operated in the inside air mode, the outside air is introduced into the blower 2 by closing the outside air intake duct 20 with the duct opening / closing door 25. Can be prevented. Therefore, it can be prevented that the outside air is mixed into the inside air of the blower 2 and the air conditioning effect of the air conditioner 1 is impaired while the blower 2 is operating in the inside air mode. Further, if the position of the switching door 50 is changed and the opening area of the outside air intake 11 is changed, the frequency of the sound silenced in the resonance chamber S can be changed. ‥

Specifically, in the above-described embodiment, the switching door 50 is movable between a first position that opens the inside air intake 12 and a second position that closes the inside air intake 12. Then, when the switching door 50 is in the first position, the outside air intake 11 is partially opened so that the inside space of the outside air intake duct 20 and the inside space of the air intake housing 10 communicate with each other. In this way, the resonance chamber S can be formed in the outside air intake duct 20 while the blower 2 is operating in the inside air mode. Further, by changing the first position to change the opening area of the outside air intake 11, it is possible to change the frequency of the sound silenced in the outside air intake duct 20. ‥

In addition, in the above-described embodiment, the blower 2 further includes the control device 60 that controls the duct opening / closing door 25 and the switching door 50. When the switching door 50 is arranged at the first position, the control device 60 arranges the duct opening / closing door 25 at a position where the outside air intake duct 20 is closed. This prevents outside air from flowing into the air intake housing 10 through the partially opened outside air inlet 11 while the blower 2 is operating in the inside air mode, as described above. ‥

Further, in the above-described embodiment, the control device 60 controls the switching door 50 so that the switching door 50 is arranged at the first position and the duct opening / closing door 25 is arranged at the position closing the outside air intake duct 20. When controlling the duct opening / closing door 25, the duct opening / closing door 25 is controlled after controlling the switching door 50. Thereby, the flow rate of the air flowing through the outside air intake duct 20 can be reduced before the outside air intake duct 20 is closed by the duct opening / closing door 25. As a result, when the duct opening / closing door 25 is driven, the air resistance received by the duct opening / closing door 25 by the air flowing through the outside air intake duct 20 can be reduced, and the duct opening / closing door 25 can be easily driven. . ‥

Further, in the embodiment described above, the vehicle air conditioner 1 includes the blower 2 described above, and the air conditioner 3 that blows the air sent from the blower 2 into the cabin of the vehicle. ‥

Further, in the above-described embodiment, the vehicle air conditioner 1 includes the blower 2 including the control device 60, and the air conditioner 3 that blows the air sent from the blower 2 into the vehicle cabin. The air conditioning unit 3 has an air conditioning case 30 that forms an air passage 3a through which air flows. The air conditioning case 30 is connected to the discharge port 6b of the scroll housing 6 and has an inflow port 31 into which air from the blower 2 flows, and at least one

blowout passage

32a, 32b, 32c through which air passing through the air passage 3a is blown out. And have. The air conditioner 3 is provided for each of the at least one

outlet passages

32a, 32b, 32c, and is movable between a position where the

corresponding outlet passages

32a, 32b, 32c are opened and a position where they are closed. It has at least one

outlet passage door

38a, 38b, 38c. Then, the control device 60 determines the first position according to the position of at least one of the

outlet passage doors

38a, 38b, 38c. ‥

According to such an air conditioner 1, different sounds to be silenced depending on the positions of the

outlet passage doors

38a, 38b, 38c (in other words, which

outlet passages

32a, 32b, 32c are opened (closed)). Different sounds to be muted) can be appropriately muted. ‥

Specifically, at least one

outlet passage

32a, 32b, 32c includes a foot outlet passage 32a and an upper outlet passage (vent outlet passage) 32b provided above the foot outlet passage 32a. The at least one

outlet passage door

38a, 38b, 38c is a foot outlet passage door 38a movable between a position where the foot outlet passage 32a is opened and a position where the foot outlet passage 32a is closed, and an upper outlet passage (vent outlet passage) 32b. And an upper outlet passage door (vent outlet passage door) 38b that is movable between an open position and a closed position. Then, in the control device 60, the foot outlet passage door 38a is in a position to close the foot outlet passage 32a, and the upper outlet passage door (vent outlet passage door) 38b opens the upper outlet passage (vent outlet passage) 32b. The foot outlet passage door 38a opens the foot outlet passage 32a more than when it is in the position, and the upper outlet passage door (vent outlet passage door) 38b closes the upper outlet passage (vent outlet passage) 32b. When the switching door 50 is in the position, the first position is determined so that the opening area of the outside air intake 11 when the switching door 50 is arranged in the first position is small. ‥

In general, the noise generated by the blower 2 causes the foot blowout more than when the air conditioner 1 is operated in an operation mode (for example, a vent mode) in which the foot blowout passage 32a is closed and the upper blowout passage (vent blowout passage) 32b is opened. When operating in an operation mode (for example, a foot mode) in which the passage 32a is opened and the upper outlet passage (vent outlet passage) 32b is closed, the frequency of sound to be silenced is lower. According to the air conditioner 1 described above, the foot blowout is performed more than when the air blower 1 is operated in the operation mode (for example, the vent mode) in which the foot blowout passage 32a is closed and the upper blowout passage (vent blowout passage) 32b is opened. When operating in an operation mode (for example, a foot mode) in which the passage 32a is opened and the upper outlet passage (vent outlet passage) 32b is closed, it is possible to lower the frequency of the sound muffled in the resonance chamber S. ‥

Alternatively, in the above-described embodiment, the air conditioner 1 includes the blower 2 including the control device 60, and the air conditioner 3 that blows out the air sent from the blower 2 into the vehicle cabin. The air conditioner 3 is arranged so as to form a detour 3b between the air conditioning case 30 that forms an air passage 3a through which air flows and the inner side surface 33c of the air conditioning case 30 in the air passage 3a. And a heat exchanger 36 for heating. Further, the air conditioning unit 3 is arranged in the air passage 3a, moves between a position where the detour 3b is opened and a position where the detour 3b is closed, and goes to the air toward the heating heat exchanger 36 and the detour 3b. It has an air mix door 7 for adjusting the ratio with air. Then, the control device 60 sets the switching door 50 to the first position when the air mix door 7 is located at the position where the air mix door 7 closes the detour 3b rather than when the air mix door 7 is located at the position where the detour 3b is opened. The first position is determined so that the opening area of the outside air intake 11 when arranged is small. ‥

Generally, the noise generated by the blower 2 is generated by arranging the air mix door 7 at a position to close the bypass 3b as compared with the case of operating the air conditioner 1 by arranging the air mix door 7 at a position to open the bypass 3b. When the air conditioner 1 is operated by using the air conditioner, the frequency of the sound to be silenced is lower. According to the air conditioner 1 described above, the sound is muted in the resonance chamber S when the air mix door 7 is at the position where the air mix door 7 closes the bypass 3b, rather than when the air mix door 7 is at the position where the bypass 3b is open. It is possible to lower the sound frequency. ‥

Alternatively, in the above-described embodiment, the control device 60 reduces the opening area of the outside air intake 11 when the switching door 50 is arranged at the first position as the ventilation resistance of the air flowing out from the discharge port 6b is higher. Thus, the first position is determined. In general, the noise generated by the blower 2 has a lower frequency of sound to be silenced in order to effectively reduce the noise, when the ventilation resistance is high and when the ventilation resistance is high. Therefore, the higher the ventilation resistance, the smaller the opening area of the outside air intake 11 when the switching door 50 is arranged at the first position becomes. Can be properly silenced in the resonance chamber S. ‥

<Modification 1> Next, Modification 1 of the air conditioner of the above-described embodiment will be described with reference to FIGS. 7 and 8. FIG. 7: is a figure which shows typically the structure of the air conditioner 1a by the modification 1. As shown in FIG. In addition, FIG. 8 is a diagram showing a difference in frequency characteristic of noise generated by a conventional blower due to a difference in rotation speed of an impeller. The blowing mode is a foot mode. ‥

In Modified Example 1 shown in FIGS. 7 and 8, compared to the air conditioner 1 shown in FIGS. 1 to 6, the control device 60a controls the switching door 50 and the duct opening / closing door 25 based on the rotation speed of the motor 5. They are different in that they do. The other configurations of the blower 2a and the air conditioner 1a are substantially the same as those of the blower 2 and the air conditioner 1 shown in FIGS. 1 to 6. In Modification 1 shown in FIGS. 7 and 8, the same parts as those of the embodiment shown in FIGS. 1 to 6 are designated by the same reference numerals, and detailed description thereof will be omitted. ‥

First, with reference to FIG. 8, a difference in frequency characteristics of noise generated by a conventional blower due to a difference in rotation speed of an impeller will be described. FIG. 8 shows the frequency characteristics of noise obtained in the vicinity of the intake port of the blower when the impeller of the conventional blower described above is rotated at a rotation speed of 2900 rpm and when it is rotated at a rotation speed of 2000 rpm. FIG. The horizontal axis represents frequency, and the vertical axis represents the A characteristic sound pressure level of the 1/3 octave bandwidth filter. ‥

As shown in FIG. 8, when the impeller is rotated at a rotation speed of 2000 rpm, the frequency characteristic curve forms a gentle peak as a whole over the range of 80 to 6300 Hz. In the case of noise having such a frequency characteristic, the noise can be effectively reduced by silencing the sound of the frequency having the highest sound pressure level (sound near 800 Hz in the example shown in FIG. 8). On the other hand, when the impeller is rotated at a rotation speed of 2900 rpm, the frequency characteristic curve forms a sharp peak in the vicinity of 130 Hz, and in other frequency bands, it forms a gentle peak as a whole. In the case of noise having such frequency characteristics, a sound near 130 Hz at which a sound pressure level forms a sharp peak is perceived as an offensive sound. Therefore, if the sound near 130 Hz is silenced, the noise can be effectively reduced.

As described above, the characteristics of the noise generated by the blower differ depending on the rotation speed of the impeller, and thus the frequency of the sound to be silenced also depends on the rotation speed of the impeller. Then, as shown in FIG. 8, when the rotation speed of the impeller is high and when the rotation speed is low, the frequency of the sound to be silenced is lower when the rotation speed is higher. ‥

Considering this point, the control device 60a of the first modification determines the first position according to the rotation speed of the motor 5 that rotates the impeller 4. ‥

Specifically, the control device 60a determines the first position such that the faster the rotation speed of the motor 5 is, the smaller the opening area of the outside air intake 11 is when the switching door 50 is arranged at the first position. . As a result, as understood from the above formula, the higher the rotational speed of the motor 5, the lower the frequency of the sound muffled in the resonance chamber S can be. ‥

In the example shown in FIG. 7, the control device 60a determines the rotation speed of the motor 5 based on the information obtained from the motor control unit 8a. ‥

As described above, in the blower 2a according to the first modification, the control device 60a controls the opening area of the outside air intake 11 when the switching door 50 is arranged at the first position as the rotation speed of the motor 5 becomes faster. , Determine the first position. In general, the higher the rotational speed of the motor 5, the lower the frequency of the noise generated by the blower 2 should be. According to the blower 2a described above, the higher the rotational speed of the motor 5, the lower the frequency of the sound muffled in the resonance chamber S can be. ‥

<Modification 2> Next, with reference to FIG. 9, a modification 2 of the air conditioner of the above-described embodiment will be described. FIG. 9: is a figure which shows the structure of the air conditioning apparatus 1b by the modification 2 typically. ‥

In Modified Example 2 shown in FIG. 9, compared to the blower 2 shown in FIGS. 1 to 6, the blower 2b has a noise detecting means 65, and the control device 60b is based on the detection result of the noise detecting means 65. It is different in that it is possible to determine the first position by using. The other configurations of the blower 2b and the air conditioner 1b are substantially the same as those of the blower 2 and the air conditioner 1 shown in FIGS. 1 to 6. In Modification 2 shown in FIG. 9, the same parts as those in the embodiment shown in FIGS. 1 to 6 are designated by the same reference numerals, and detailed description thereof will be omitted. ‥

As described above, the blower 2b further includes the noise detection unit 65 that detects the noise level. In the example shown in FIG. 9, the noise detection means 65 is arranged in the vicinity of the inside air intake 12, and detects the noise level at the inside air intake 12 for each frequency. Then, the control device 60b determines the first position according to the noise level for each frequency detected by the noise detecting means 65. Specifically, the lower the frequency of the sound to be silenced in order to effectively reduce the noise, the smaller the opening area of the outside air intake 11 when the switching door 50 is placed in the first position. , Determine the first position. ‥

As described above, the blower 2b according to the second modification further includes the noise detection unit 65 that detects the noise level at the inside air intake 12 for each frequency. Then, the control device 60b determines the first position according to the noise level for each frequency detected by the noise detecting means 65. According to such a blower 2b, it is possible to appropriately muffle the sound to be silenced in the noise generated by the blower 2b in the resonance chamber S. ‥

<Modification 3> Next, with reference to FIG. 10, a modification 3 of the air conditioner of the above-described embodiment will be described. FIG. 10 is a cross-sectional view schematically showing the air intake housing 10c of the blower 2c according to Modification 3. ‥

The modified example 3 shown in FIG. 10 is different from the air intake housing 10 shown in FIGS. 1 to 6 in that the switching door 55 is of a type called a cantilever type door or a butterfly door. Other configurations of the air intake housing 10c and the blower 2c are substantially the same as those of the air intake housing 10 and the blower 2 shown in FIGS. 1 to 6. In Modification 3 shown in FIG. 10, the same parts as those of the embodiment shown in FIGS. 1 to 6 are designated by the same reference numerals, and detailed description thereof will be omitted. ‥

The switching door 55 is a flat plate-shaped member. The switching door 55 extends from a shaft 55s extending in the left-right direction near the upper edges of the outside air intake 11 and the inside air intake 12. When the switching door 55 rotates the shaft 55s in the circumferential direction, the switching door 55 rotates about the rotation axis of the shaft 55s to open the inside air intake 12 (the position indicated by the solid line in FIG. 10) and the outside air intake. It is possible to move between a second position where 11 is opened (a position shown by a broken line in FIG. 10). The shaft 55s is rotationally driven by an actuator (not shown). ‥

The switching door 55 shown in FIG. 10 can also form the resonance chamber S in the outside air intake duct 20 while the blower 2c is operating in the inside air mode. ‥

<Modification 4> Next, Modification 4 of the air conditioner of the above-described embodiment will be described with reference to FIG. FIG. 11: is sectional drawing which shows typically the air intake housing 10d of the air blower 2d by the modification 4. As shown in FIG. ‥

The modified example 4 shown in FIG. 11 is different from the air intake housing 10 shown in FIGS. 1 to 6 in that ribs 70 are arranged inside the outside air intake duct 20. Other configurations of the air intake housing 10d and the blower 2d are substantially the same as those of the air intake housing 10 and the blower 2 shown in FIGS. 1 to 6. In Modification 4 shown in FIG. 11, the same parts as those of the embodiment shown in FIGS. 1 to 6 are designated by the same reference numerals, and detailed description thereof will be omitted. ‥

As described above, the rib 70 is arranged inside the outside air intake duct 20. In the illustrated example, the rib 70 is a plate-shaped member and extends along the inner side surface 20a of the outside air intake duct 20 (more specifically, the lower side surface 20au located below the inner side surface 20a). ing. The rib 70 is arranged such that the end portion of the air intake housing 10d on the inner space side is along the lower end edge 51s of the peripheral surface 51 of the switching door 50 arranged at the first position. Further, one end of the rib 70 is opened toward the inner space of the air intake housing 10d between the lower surface 20au of the inner side surface 20a and the other end of the rib 70 inside the outside air intake duct 20. A passage 71 opened to the space is formed. ‥

The length L70 of the rib 70 corresponds to the length L of the opening in the above equation. Therefore, according to such an air intake housing 10d, by adjusting the length L70 of the rib 70, as can be understood from the above formula, the frequency of the sound to be silenced in the resonance chamber S can be adjusted. You can That is, the noise can be reduced without depending on the frequency of the sound to be silenced in the resonance chamber S depending on the thickness of the lower end edge 51s of the peripheral surface 51 of the switching door 50. The longer the length L70 is, the smaller the frequency of the sound silenced in the resonance chamber S can be. ‥

As described above, in the blower 2d according to the modified example 4, the inside of the outside air intake duct 20 extends along the inner side surface 20a of the outside air intake duct 20, and one end portion of the blower 2d is connected to the inside surface 20a. A rib 70 is provided which forms a passage 71 which is open toward the internal space of the intake housing 10d and whose other end is open toward the internal space of the outside air intake duct 20. According to such a blower 2d, by adjusting the length L70 of the rib 70, it is possible to adjust the frequency of the sound silenced in the resonance chamber S. ‥

<Fifth Modification> Next, a fifth modification of the air conditioner according to the above-described embodiment will be described with reference to FIG. FIG. 12 is a cross-sectional view schematically showing the air intake housing 10e of the blower 2e according to the modified example 5. ‥

The modification 5 shown in FIG. 12 is different from the air intake housing 10c of the modification 3 shown in FIG. 10 in that a rib 75 is arranged inside the outside air intake duct 20. Other configurations of the air intake housing 10e and the blower 2e are substantially the same as those of the air intake housing 10c and the blower 2c of the third modification shown in FIG. In Modification 5 shown in FIG. 12, the same parts as those in Modification 3 shown in FIG. 10 are designated by the same reference numerals, and detailed description thereof will be omitted. ‥

As described above, the ribs 75 are arranged inside the outside air intake duct 20. In the illustrated example, the rib 75 is a plate-shaped member and extends upward and rearward from the vicinity of the lower edge of the outside air intake 11. The rib 75 extends along the switching door 55 arranged in the first position, and one end of the rib 75 is located inside the air intake housing 10c between the rib 75 and the switching door 55 arranged in the first position. The passage 76 is open toward the outside and the other end is opened toward the internal space of the outside air intake duct 20. ‥

The length L75 of the rib 75 corresponds to the length L of the opening in the above equation. Therefore, according to such an air intake housing 10e, by adjusting the length L75 of the rib 75, the resonance chamber S formed in the outside air intake duct 20 is adjusted, as can be understood from the above formula. The frequency of the muted sound can be adjusted. That is, the noise can be reduced without depending on the frequency of the sound to be muffled in the resonance chamber S depending on the thickness of the peripheral wall portion of the outside air intake duct 20. It should be noted that as the length L75 is increased, the frequency of the sound silenced in the resonance chamber S can be decreased. ‥

As described above, in the blower 2e according to the modified example 5, the blower 2e extends inside the outside air intake duct 20 along the switching door 55 arranged at the first position, and between the switching door 55 arranged at the first position. There is a rib 75 forming a passage 76, one end of which is open toward the internal space of the air intake housing 10e and the other end of which is open toward the internal space of the outside air intake duct 20. There is. According to such a blower 2e, the frequency of the sound silenced in the resonance chamber S can be adjusted by adjusting the length L75 of the rib 75.

INDUSTRIAL APPLICABILITY The air conditioner for a vehicle and the blower used in the air conditioner for a vehicle according to the present invention can be industrially manufactured and can be a target of commercial transactions, and thus have an economic value and are industrially advantageous. Can be used.

1, 1a, 1b

Vehicle air conditioner

2, 2a, 2b, 2c, 2d, 2e Blower 3 Air conditioner 4 Impeller 6 Scroll housing 7

Air mix door

10, 10c, 10d, 10e Air intake housing 11 Outside air intake Inlet 12 Inside air intake 20 Outside air intake duct 25 Duct opening / closing door 30

Air conditioning case

32a, 32b, 32c Blowing passage 36

Heating heat exchangers

38a, 38b, 38c Blowing

passage door

50, 55 switching

door

60, 60a, 60b Control device 65 noise detection means 70, 75 rib S resonance chamber

Claims

A blower (2, 2a, 2b, 2c, 2d, 2e) used in a vehicle air conditioner, having a plurality of blades (4a) forming a circumferential blade row, and a rotating shaft of a motor (5) An impeller (4) rotationally driven by (5a), an internal space for accommodating the impeller (4), a suction port (6a) opening in the axial direction of the rotating shaft (5a), and the impeller A scroll housing (6) having a discharge port (6b) opening in the circumferential direction of the scroll housing, and an air intake housing (10, 10c) having an internal space communicating with the suction port (6a) of the scroll housing (6). 10d, 10e), at least one outside air inlet (11) for taking in outside air into the internal space of the air intake housing and at least one for taking inside air into the internal space of the air intake housing. One The inside air intake (12) is provided with the air intake housing (10, 10c, 10d, 10e), and at least one for opening and closing the outside air intake (11) and the inside air intake (12) A switching door (50, 55) and a cylindrical outside air intake duct (20) having openings at both ends, one opening (21) being connected to the outside air intake (11), An outside air intake duct (20) extending from the outside air intake (11) to the side opposite to the internal space of the air intake housing (10, 10c, 10d, 10e) and separated from the outside air intake (11). A blower (2, 2a, 2b, 2c, 2d, 2e) having a duct opening / closing door (25) for opening and closing the outside air intake duct (20) at a position.
The switching doors (50, 55) are movable between a first position that opens the inside air intake port (12) and a second position that closes the inside air intake port (12). 50, 55) in the first position, the internal space of the outside air intake duct (20) communicates with the internal space of the air intake housings (10, 10c, 10d, 10e). Blower (2, 2a, 2b, 2c, 2d, 2e) according to claim 1, wherein the outside air intake (11) is partially open.
The control device (60, 60a, 60b) further includes a control device (60, 60a, 60b) for controlling the duct opening / closing door (25) and the switching door (50, 55). The blower (2, 2a, 2b) according to claim 2, wherein the duct opening / closing door (25) is arranged at a position to close the outside air intake duct (20) when the 55) is arranged at the first position. 2c, 2d, 2e).
The controller (60) controls the outside air intake (11) when the switching doors (50, 55) are arranged at the first position as the ventilation resistance of the air flowing out of the discharge port (6b) is higher. The blower (2) according to claim 3, wherein the first position is determined so that the opening area of) is small.
The control device (60a) has a smaller opening area of the outside air intake port (11) when the switching door (50, 55) is arranged at the first position as the rotation speed of the motor (5) is faster. The blower (2a) according to claim 3, wherein the first position is determined so that.
The control device (60b) further comprises noise detection means (65) for detecting the noise level at the inside air intake (12) for each frequency, and the noise level for each frequency detected by the noise detection means (65). The blower (2b) according to claim 3, wherein the first position is determined according to.
In the control device (60, 60a, 60b), the switching door (50, 55) is arranged at the first position, and the duct opening / closing door (25) closes the outside air intake duct (20). When controlling the switching doors (50, 55) and the duct opening / closing door (25) so as to be arranged in a position, after controlling the switching door (50, 55), the duct opening / closing door (25) is controlled. The blower (2, 2a, 2b, 2c, 2d, 2e) according to any one of claims 3 to 6.
The inside of the outside air intake duct (20) extends along the inner side surface of the outside air intake duct (20), and one end of the outside air intake duct (20) is connected to the inside of the air intake housing (20a). A rib (70) forming a passage (71) open to the internal space of 10d) and the other end of which is open to the internal space of the outside air intake duct (20), The blower (2d) according to claim 2.
Inside the outside air intake duct (20), extending along the switching door (55) arranged at the first position, and between the switching door (55) arranged at the first position, A passage (76) is formed, one end of which is open toward the internal space of the air intake housing (10e) and the other end of which is open toward the internal space of the outside air intake duct (20). The blower (2e) according to claim 2, wherein the ribs (75) are arranged.
The blower (2, 2a, 2b, 2c, 2d, 2e) according to any one of claims 1 to 9, and an air conditioner (3) that blows out the air sent from the blower into the interior of the vehicle. An air conditioner (1, 1a, 1b) for a vehicle, including:
An air conditioner (1) for a vehicle, comprising: the blower (2) according to claim 3; and an air conditioner (3) that blows the air sent out from the blower into the interior of the vehicle. The harmony part (3) is an air conditioning case (30) that forms an air passage (3a) through which air flows, and is connected to the discharge port (6b) of the scroll housing (6) and the blower (2). An air conditioner case (30) having an inflow port (31) into which air from the air flows in and at least one blowing passage (32a, 32b, 32c) through which the air passing through the air passage (3a) is blown out. , At least one outlet passage door (3 provided for each of the at least one outlet passages (32a, 32b, 32c) and movable between a position where the corresponding outlet passage is opened and a position where the corresponding outlet passage is closed) a, 38b, includes a 38c), the said control unit (60) determines said first position in response to the position of the at least one outlet passage door, the air conditioner (1).
The at least one blowing passage (32a, 32b, 32c) includes a foot blowing passage (32a) and an upper blowing passage (32b) provided above the foot blowing passage, and the at least one blowing passage The passage doors are a foot outlet passage door (38a) movable between a position where the foot outlet passage (32a) is opened and a position where the foot outlet passage is closed, and a position where the upper outlet passage (32b) is opened and closed. And an upper blow-out passage door (38b) movable between the control device (60), the foot blow-out passage door (38a) closing the foot blow-out passageway (32a), In addition, the foot blowout passage door (38a) is positioned at a position where the foot blowout passage door (38a) opens the upper blowout passage (32b). When the passage (32a) is in the open position and the upper outlet passage door (38b) is in the position of closing the upper outlet passage (32b), the switching door (50, 55) is the first door. The air conditioner (1) according to claim 11, wherein the first position is determined such that the opening area of the outside air intake (11) when arranged in a position is small.
An air conditioner (1, 1a, 1b) for a vehicle, comprising: the blower (2) according to claim 3; and an air conditioner (3) that blows the air sent out from the blower into the interior of the vehicle. The air conditioning section (3) includes an air conditioning case (30) that forms an air passage (3a) through which air flows, and an inside surface of the air conditioning case (30) inside the air passage (3a). A heat exchanger (36) for heating arranged so as to form a detour between the two, and it is arranged in the air passage (3a) and moves between a position where the detour is opened and a position where the detour is closed. And an air mix door (7) for adjusting a ratio of air toward the heating heat exchanger (36) and air toward the detour, wherein the control device (60) includes the air mix. If the door (7) is in a position to open the detour Of the outside air intake (11) when the switching doors (50, 55) are arranged in the first position when the air mix door (7) is in a position to close the detour. An air conditioner (1) that determines the first position so that the opening area becomes small.