WO2021090648A1

WO2021090648A1 - Blower

Info

Publication number: WO2021090648A1
Application number: PCT/JP2020/038688
Authority: WO
Inventors: 善博鈴木; ウェイ黄
Original assignee: 株式会社デンソー
Priority date: 2019-11-07
Filing date: 2020-10-14
Publication date: 2021-05-14
Also published as: JP2021076055A

Abstract

A first air introduction opening (11) and second air introduction openings (12, 13) are formed in an air introduction box (10). An impeller (30) is accommodated in a casing (20) provided on the downstream side of the air introduction box (10). A bell mouth (50) is provided between the air introduction box (10) and the impeller (30) and forms a suction opening for air to be sucked into the impeller (30) from the air introduction box (10). A separating tube (60) has a shape which broadens radially outward through the inside of the impeller (30) from an air inlet portion (61) disposed on the air introduction box (10) of the impeller (30). A guide wall (70, 76, 701, 702) divides a flow passage formed between the separating tube (60) and the bell mouth (50) into an inside flow passage (72) on the separating tube (60) side and an outside flow passage (73) on the bell mouth (50) side, and guides both air flowing through the inside flow passage (72) and air flowing through the outside flow passage (73) to the impeller (30).

Description

Blower

Cross-reference to related applications

This application is based on Japanese Patent Application No. 2019-202569 filed on November 7, 2019, the contents of which are incorporated herein by reference.

This disclosure relates to a blower.

Conventionally, there is known a one-sided suction type blower capable of sucking in vehicle interior air (hereinafter referred to as inside air) and vehicle interior outside air (hereinafter referred to as outside air) at the same time and blowing them out separately.
In the blower described in Patent Document 1, the outside air and the inside air introduced from the air introduction port formed in the air introduction box are sucked into the impeller via the filter and blown out to the ventilator outside the radial direction of the impeller. It is configured to be. The radial outer ventilation path of the impeller is partitioned by a partition wall into one first ventilation path and the other second ventilation path in the rotation axis direction of the impeller. Inside the impeller, a separation cylinder is provided to separate the air introduced from the air introduction box and passing through the filter (that is, the outside air and the inside air) into the first ventilation passage and the second ventilation passage. There is. The separation cylinder has a shape that extends radially outward from the air inlet portion arranged adjacent to the filter through the inside of the impeller. With this configuration, a part of the air that has passed through the filter enters the air inlet portion of the separation cylinder, flows inside the separation cylinder, and flows to the second ventilation passage through the impeller. On the other hand, the other part of the air that has passed through the filter flows outside the separation cylinder without entering the air inlet portion of the separation cylinder, and flows to the first ventilation passage through the impeller. In this way, the blower is configured to divide the outside air and the inside air sucked from the air introduction box into the first ventilation passage and the second ventilation passage and blow them out.

French Patent Application Publication No. 3072054A1

Regarding the blower described in Patent Document 1 described above, the inventors have found the following problems. That is, in this blower, a large filter is formed on the inner peripheral edge of the bell mouth forming the suction port of the impeller. Further, in this blower, the flow path on the downstream side of the filter is separated into a flow path inside the separation cylinder and a flow path outside the separation cylinder. Therefore, in the flow path outside the separation cylinder, the air that has passed through the filter is concentrated in the vicinity of the bell mouth. As a result, in the flow path outside the separation cylinder, the variation in the wind speed distribution becomes large, and high-frequency abnormal noise such as a siren sound may be generated.

The object of the present disclosure is to provide a blower capable of suppressing the generation of abnormal noise.

According to one aspect of the present disclosure, in a blower capable of simultaneously sucking in the first air and the second air and blowing them out separately.
An air introduction box in which a first air introduction port into which the first air is introduced and a second air introduction port into which the second air is introduced are formed.
The casing provided on the downstream side of the air introduction box and
An impeller housed in a casing, which sucks at least one of the first air and the second air introduced into the air introduction box from one side of the impeller in the direction of the rotation axis and blows them out in a direction away from the rotation axis. With an impeller
An annular bell mouth, which is provided between the air introduction box and the impeller and forms a suction port for air sucked into the impeller from the air introduction box.
A separation cylinder with a shape that extends radially outward from the air inlet located on the air introduction box side with respect to the impeller, passing through the inside of the impeller, and
The flow path formed between the separation cylinder and the bell mouth is divided into an inner flow path on the separation cylinder side and an outer flow path on the bell mouth side, and air flowing through the inner flow path and air flowing through the outer flow path are separated. Each is equipped with a guide wall that guides the impeller.

According to this, of the air sucked from the air introduction box to the impeller, the air flowing outside the separation cylinder is separated into the air flowing through the inner flow path and the air flowing through the outer flow path by the guide wall. It is sucked into the impeller. At that time, the air flowing through the inner flow path flows at a place away from the bell mouth. Therefore, among the air sucked from the air introduction box to the impeller, the air that flows concentrated in the vicinity of the bell mouth is reduced. Therefore, this blower can reduce the variation in the wind speed distribution in the flow path outside the separation cylinder and suppress the generation of abnormal noise.

Note that the reference symbols in parentheses attached to each component or the like indicate an example of the correspondence between the component or the like and the specific component or the like described in the embodiment described later.

It is sectional drawing of the blower which concerns on 1st Embodiment. It is a perspective view which shows the state which removed the air introduction box and the filter of the blower which concerns on 1st Embodiment. It is explanatory drawing for demonstrating the flow of the air of the flow path outside the separation cylinder (that is, the outer flow path and the inner flow path) in the blower which concerns on 1st Embodiment. It is explanatory drawing for demonstrating the flow of the air of the flow path outside the separation cylinder in the blower of a comparative example. It is a perspective view which shows the state which removed the air introduction box and the filter of the blower which concerns on 2nd Embodiment. FIG. 5 is a cross-sectional view showing a separation cylinder, a guide wall, a connecting portion, and the like in the VI-VI line of FIG. It is sectional drawing of the blower which concerns on 3rd Embodiment. It is sectional drawing of the blower which concerns on 4th Embodiment. FIG. 5 is a plan view showing a separation cylinder, a guide wall, a connecting portion, and the like in the IX-IX line cross section of FIG. It is explanatory drawing for demonstrating the position of the guide wall in the blower which concerns on 4th Embodiment.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In each of the following embodiments, the same or equal parts are designated by the same reference numerals, and the description thereof will be omitted. In the following description, the terms upper, lower, left, and right are used for convenience of explanation, and do not mean the direction in which each member is arranged when the member is mounted on a vehicle or the like.

(First Embodiment)
The first embodiment will be described. The blower 1 of the present embodiment is applicable to a vehicle air conditioner having two layers of inside and outside air. The blower 1 simultaneously sucks in the vehicle interior air as the first air (hereinafter referred to as "outside air") and the vehicle interior air as the second air (hereinafter referred to as "inside air"), and separately blows them out. It is a possible configuration. The air blown from the blower 1 (that is, outside air and inside air) is supplied to an air conditioning unit (not shown) included in the vehicle air conditioner. The air conditioning unit generates air conditioning air that regulates the temperature and humidity of the air supplied from the blower 1, and blows the air conditioning air from each air outlet toward the front window of the vehicle, the upper body of the occupant, the feet of the occupant, and the like. It is possible.

<Structure of blower 1>
As shown in FIGS. 1 and 2, the blower 1 includes an air introduction box 10, a scroll casing 20, an impeller 30, a filter 40, a bell mouth 50, a separation cylinder 60, a guide wall 70, and the like.
In the following description, the radial direction of the virtual circle drawn on a plane orthogonal to the rotation axis Ax of the impeller 30 with an arbitrary point on the rotation axis Ax of the impeller 30 as the center is defined as "the diameter of the impeller 30". It is called "direction", and the circumferential direction of the virtual circle is sometimes called "circumferential direction of the impeller 30". It is assumed that the rotating shaft Ax of the impeller 30 coincides with the shaft core of the impeller 30.

The air introduction box 10 is arranged above the blower 1. The air introduction box 10 is formed with an outside air introduction port 11, a first inside air introduction port 12, and a second inside air introduction port 13. The outside air introduction port 11 is an opening for introducing outside air inside the air introduction box 10. The first inside air introduction port 12 and the second inside air introduction port 13 are openings for introducing inside air inside the air introduction box 10. The outside air introduction port 11 is an example of a first air introduction port into which the first air is introduced. Further, the first inside air introduction port 12 and the second inside air introduction port 13 are examples of the second air introduction port into which the second air is introduced.

Inside the air introduction box 10, an outside air door 14, an inside / outside air door 15, an inside air door 16, an air introduction cylinder 17, and the like are provided. The outside air door 14 is a door that opens and closes the outside air introduction port 11. The inside / outside air door 15 is a door for selectively introducing air into the air introduction cylinder 17 from the outside air introduction port 11 and the first inside air introduction port 12. The inside air door 16 is a door that opens and closes the second inside air introduction port 13. The outside air door 14 and the inside air door 16 are composed of butterfly doors. The inside / outside air door 15 is composed of a rotary door.
The outside air door 14 and the inside air door 16 may be composed of doors other than the butterfly door (for example, a rotary door). Further, the inside / outside air door 15 may be composed of a door other than the rotary door (for example, a butterfly door).

The filter 40 is arranged in the air introduction box 10 in contact with or adjacent to the end of the air introduction cylinder 17 on the impeller 30 side. The filter 40 is configured, for example, by bending a dust removing filter medium having a predetermined air permeability into a fold shape. The filter 40 collects foreign matter contained in the air flowing from the air introduction box 10 toward the impeller 30. The air introduction box 10 and the filter 40 are formed in a substantially rectangular shape when viewed from above.

A scroll casing 20 is provided on the downstream side of the air introduction box 10. The impeller 30 is housed inside the scroll casing 20.

The impeller 30 is a centrifugal fan that rotates by being driven by an electric motor 31. Specifically, the impeller 30 is composed of a sirocco fan. The impeller 30 is not limited to this, and may be composed of a radial fan, a turbo fan, or the like. When the impeller 30 is rotated by the drive of the electric motor 31, the impeller 30 is configured to suck in air from one side in the direction of the rotating shaft Ax and blow out the sucked air in the direction away from the rotating shaft Ax. There is.

The impeller 30 has a main plate 32, a plurality of first blades 33, a plurality of second blades 34, and a separation plate 35.
The main plate 32 is formed in a disk shape. The shaft 36 of the electric motor 31 is fixed to the central portion of the main plate 32. A plurality of second blades 34 are arranged with respect to the main plate 32. A plurality of first blades 33 are arranged on the filter 40 side of the plurality of second blades 34 via the separation plate 35.

The plurality of first blades 33 and the plurality of second blades 34 are all arranged at predetermined intervals in the circumferential direction of the impeller 30. A flow path 37 between the first blades through which air flows is formed between the plurality of first blades 33. A flow path 38 between the second blades through which air flows is formed between the plurality of second blades 34.
The separation plate 35 connects the plurality of first blades 33 and the plurality of second blades 34. The separation plate 35 separates the first blade-to-blade flow path 37 and the second blade-to-blade flow path 38.

The scroll casing 20

forms ventilation passages

21 and 22 on the radial outer side of the impeller 30. A partition wall 23 is provided in the

ventilation passages

21 and 22. The partition wall 23 is provided at a position corresponding to the separating plate 35 of the impeller 30. In the partition wall 23, the

ventilation passages

21 and 22 on the outer side in the radial direction of the impeller 30 are the first ventilation passage 21 in the rotation axis Ax direction of the impeller 30 and the other first ventilation passage 21 in the rotation axis Ax direction of the impeller 30. It is divided into two ventilation passages 22. The first ventilation passage 21 and the second ventilation passage 22 are configured to rectify the airflow radiating from the impeller 30 into a flow in the circumferential direction of the impeller 30 and supply the airflow to an air conditioning unit (not shown). Has been done.

A suction port forming portion 24 forming an upper wall of the first ventilation passage 21 is provided on one side of the scroll casing 20 in the direction of the rotation axis Ax of the impeller 30. An annular bell mouth 50 for forming a suction port for air sucked into the impeller 30 is provided substantially in the center of the suction port forming portion 24. That is, the flow path inside the bell mouth 50 serves as a suction port for air sucked into the impeller 30. The bell mouth 50 is provided between the filter 40 and the impeller 30, and has a cross-sectional shape curved in an arc shape so that the air passing through the filter 40 smoothly flows to the suction port of the impeller 30. ..

A separation cylinder 60 is provided in the space inside the first blade 33 and the second blade 34 of the impeller 30 in the radial direction (hereinafter, simply referred to as "inside the impeller 30"). The separation cylinder 60 is a tubular member extending in the rotation axis Ax direction of the impeller 30, and both ends in the axial direction are open. In the separation cylinder 60, the opening on the filter 40 side with respect to the impeller 30 is referred to as an air inlet portion 61, and the opening on the side opposite to the filter 40 with respect to the impeller 30 is referred to as an air outlet portion 62.

The air inlet portion 61 of the separation cylinder 60 is arranged on the filter 40 side with respect to the impeller 30, and is in contact with or adjacent to the filter 40. The opening on the filter 40 side of the air introduction cylinder 17 provided inside the air introduction box 10 and the air inlet portion 61 of the separation cylinder 60 are aligned or coincide with each other when viewed from the axial direction of the impeller 30. , Most of them are provided so as to overlap. Therefore, most of the air flowing inside the air introduction cylinder 17 flows to the inside of the separation cylinder 60 through the filter 40. On the other hand, most of the air flowing outside the air introduction cylinder 17 flows outside the separation cylinder 60 through the filter 40.

The separation cylinder 60 is formed in a flare shape that passes from the air inlet portion 61 to the inside of the impeller 30 and gradually expands outward in the radial direction as it approaches the air outlet portion 62. The outer edge portion of the separation cylinder 60 on the air outlet portion 62 side is provided at a position corresponding to the separation plate 35 of the impeller 30. As a result, of the air that has passed through the filter 40, the air that flows outside the separation cylinder 60 flows to the first ventilation passage 21 via the flow path 37 between the first blades of the impeller 30. On the other hand, of the air that has passed through the filter 40, the air that flows inside the separation cylinder 60 flows to the second ventilation passage 22 via the flow path 38 between the second blades of the impeller 30.

A guide wall 70 is provided inside the impeller 30 and outside the separation cylinder 60. The guide wall 70 of the present embodiment is a tubular member extending in the rotation axis Ax direction of the impeller 30, and both ends in the axial direction are open. The end 71 of the guide wall 70 on the filter 40 side is in contact with or adjacent to the filter 40. The guide wall 70 is in contact with or adjacent to the surface of the filter 40 on the impeller 30 side, and extends from there to the middle of the inside of the impeller 30. The guide wall 70 has a flow path formed between the separation cylinder 60 and the bell mouth 50, an inner flow path 72 on the separation cylinder 60 side of the guide wall 70 and an outer flow path on the bell mouth 50 side of the guide wall 70. It is divided into 73. That is, the inner flow path 72 is a flow path formed between the guide wall 70 and the separation cylinder 60. On the other hand, the outer flow path 73 is a flow path formed radially outside the guide wall 70. The guide wall 70 guides the air flowing through the inner flow path 72 and the air flowing through the outer flow path 73 to the impeller 30, respectively.

The guide wall 70 is formed in a tapered shape whose diameter gradually decreases as the distance from the filter 40 increases. In other words, the guide wall 70 is formed in a flare shape in which the diameter gradually increases as it approaches the filter 40. Therefore, as shown in FIGS. 2 and 3, the diameter D1 of the end portion 71 of the guide wall 70 on the filter 40 side is larger than the diameter D2 of the end portion 74 of the guide wall 70 on the side opposite to the filter 40. Further, the distance L1 between the end 71 of the guide wall 70 on the filter 40 side and the rotation shaft Ax of the impeller 30 is the rotation shaft of the end 74 of the guide wall 70 on the opposite side of the filter 40 and the impeller 30. Distance from Ax is farther than L2. The position of the guide wall 70 is appropriately set by an experiment or the like so that the flow velocity of the air flowing through the inner flow path 72 and the flow velocity of the air flowing through the outer flow path 73 are close to each other. Further, the shape and size of the guide wall 70 are also appropriately set by experiments and the like.

Arrows FA1 and FA2 in FIG. 3 schematically show the air flow in the flow path outside the separation cylinder 60. Of the air that has passed through the filter 40, the air that flows outside the separation cylinder 60 is sucked into the impeller 30 in a state of being separated by the guide wall 70 into the air that flows through the inner flow path 72 and the air that flows through the outer flow path 73. Is done. At that time, the air flowing through the inner flow path 72 flows at a place away from the bell mouth 50. Therefore, among the air flowing through the flow paths outside the separation cylinder 60 (that is, the inner flow path 72 and the outer flow path 73), the air flowing concentrated in the vicinity of the bell mouth 50 is reduced. Therefore, the blower 1 can reduce the variation in the wind speed distribution in the flow path outside the separation cylinder 60 and suppress the generation of abnormal noise.

<Operation of blower 1>
The blower 1 is configured to be able to set as an air suction mode, an inside / outside air mode in which the outside air and the inside air are simultaneously sucked and separately blown out, an outside air mode in which the outside air is sucked in and blown out, and an inside air mode in which the inside air is sucked in and blown out. ..

FIG. 1 shows a state in which the inside / outside air mode is set in the blower 1. At that time, the outside air door 14 is displaced to a position where the outside air introduction port 11 is opened. The inside / outside air door 15 is displaced to a position where the first inside air introduction port 12 and the air introduction cylinder 17 communicate with each other and the communication between the outside air introduction port 11 and the air introduction cylinder 17 is cut off. The inside air door 16 is displaced to a position where the second inside air introduction port 13 is closed. In this state, when the impeller 30 is rotated by the drive of the electric motor 31, the outside air is introduced from the outside air introduction port 11 to the outside of the air introduction cylinder 17, and the outside air is introduced from the first inside air introduction port 12 to the inside of the air introduction cylinder 17. Shyness is introduced.

As shown by the arrow FE in FIG. 1, the outside air introduced from the outside air introduction port 11 to the outside of the air introduction cylinder 17 passes through the filter 40, and from the flow path outside the separation cylinder 60, the first impeller 30 It is sucked into the inter-blade flow path 37 and blown out to the first ventilation passage 21. The flow path outside the separation cylinder 60 includes an inner flow path 72 and an outer flow path 73.
On the other hand, as shown by the arrow FR in FIG. 1, the inside air introduced from the first inside air introduction port 12 to the inside of the air introduction cylinder 17 passes through the filter 40 and flows inside the separation cylinder 60, and the impeller 30 It is sucked into the flow path 38 between the second blades and blown out to the second ventilation passage 22.

The outside air flowing through the first ventilation passage 21 and the inside air flowing through the second ventilation passage 22 are introduced into an air conditioning unit (not shown), adjusted to a desired temperature and humidity inside the air conditioning unit, and then the vehicle is driven from each outlet. It is blown into the room. When the inside / outside air mode is set in the blower 1, the outside air flowing through the first ventilation passage 21 is mainly blown out to the windshield from the defroster outlet provided in the vehicle interior.

Although not shown, in the blower 1, when the outside air mode is set, the outside air door 14, the inside / outside air door 15, and the inside air door 16 are displaced as follows. The outside air door 14 is displaced to a position where the outside air introduction port 11 is opened. The inside / outside air door 15 is displaced to a position where the outside air introduction port 11 and the air introduction cylinder 17 communicate with each other and the communication between the first inside air introduction port 12 and the air introduction cylinder 17 is cut off. The inside air door 16 is displaced to a position where the second inside air introduction port 13 is closed. In this state, when the impeller 30 is rotated by the drive of the electric motor 31, the outside air introduced from the outside air introduction port 11 flows through both the inside and outside of the air introduction cylinder 17 and the separation cylinder 60, and the first ventilation passage 21 Is blown out to the second ventilation passage 22.

Further, in the blower 1, when the inside air mode is set, the outside air door 14, the inside / outside air door 15, and the inside air door 16 are displaced as follows. The outside air door 14 is displaced to a position where the outside air introduction port 11 is closed. The inside / outside air door 15 is displaced to a position where the first inside air introduction port 12 and the air introduction cylinder 17 communicate with each other and the communication between the outside air introduction port 11 and the air introduction cylinder 17 is cut off. The inside air door 16 is displaced to a position where the second inside air introduction port 13 is opened. In this state, when the impeller 30 is rotated by the drive of the electric motor 31, the inside air introduced from the first inside air introduction port 12 flows inside the air introduction cylinder 17 and the separation cylinder 60, and is blown out to the second ventilation passage 22. To. Further, the inside air introduced from the second inside air introduction port 13 flows outside the air introduction cylinder 17 and the separation cylinder 60, and is blown out to the first ventilation passage 21.

<Blower of comparative example>
Here, in order to compare with the blower 1 of the first embodiment described above, the blower 100 of the comparative example will be described.

As shown in FIG. 4, the blower 100 of the comparative example is different from the blower 1 of the first embodiment in that the guide wall 70 is not provided, and the other configurations are the same. That is, both the blower 100 of the comparative example and the blower 1 of the first embodiment include a separation cylinder 60. Further, the filter 40 is formed large with respect to the inner peripheral edge of the bell mouth 50.

The arrow FB in FIG. 4 schematically shows the air flow in the flow path outside the separation cylinder 60 in the blower 100 of the comparative example. As shown in the range surrounded by the broken line C, the blower 100 of the comparative example has a configuration in which the air that has passed through the filter 40 and flows through the flow path outside the separation cylinder 60 is concentrated in the vicinity of the bell mouth 50. It has become. Therefore, in the blower 100 of the comparative example, the variation in the wind speed distribution in the flow path outside the separation cylinder 60 becomes large, and a high-frequency abnormal noise such as a siren sound may be generated.

<Action and effect of the first embodiment>
The blower 1 of the first embodiment has the following effects on the blower 100 of the comparative example described above.
(1) The blower 1 of the first embodiment includes a guide wall 70 that divides the flow path formed between the separation cylinder 60 and the bell mouth 50 into an inner flow path 72 and an outer flow path 73. As a result, of the air that has passed through the filter 40, the air that flows outside the separation cylinder 60 is sucked into the impeller 30 in a state of being separated into air that flows through the inner flow path 72 and air that flows through the outer flow path 73. At that time, the air flowing through the inner flow path 72 flows at a place away from the bell mouth 50. Therefore, among the air sucked from the filter 40 to the impeller 30, the air concentrated in the vicinity of the bell mouth 50 is reduced. Therefore, the blower 1 can reduce the variation in the wind speed distribution in the flow paths outside the separation cylinder 60 (that is, the inner flow path 72 and the outer flow path 73), and can suppress the generation of abnormal noise.

(2) In the first embodiment, the guide wall 70 extends from the lower surface side of the filter 40 to the middle of the space inside the impeller 30 in the radial direction. As a result, the guide wall 70 can separate the air flowing through the outer flow path 73 and the air flowing through the inner flow path 72 and guide them to the impeller 30.

(3) In the first embodiment, in the guide wall 70, the flow velocity of the air flowing through the inner flow path 72 and the flow velocity of the air flowing through the outer flow path 73 are close to each other within the range of the separation cylinder 60 and the bell mouth 50. It is provided at the position where. As a result, the variation in the wind speed distribution in the flow path outside the separation cylinder 60 can be reduced, and the generation of abnormal noise can be suppressed.

(4) In the first embodiment, the diameter D1 of the end portion 71 of the guide wall 70 on the air introduction box 10 side is larger than the diameter D2 of the end portion 74 of the guide wall 70 on the side opposite to the air introduction box 10. .. As a result, even when the filter 40 is large with respect to the inner flow path of the bell mouth 50 (that is, the suction port of the impeller 30), the air passing through the filter 40 is concentrated in the vicinity of the bell mouth 50 on the guide wall 70. Can be prevented from flowing.

(Second Embodiment)
The second embodiment will be described. The second embodiment shows an example of a method of fixing the guide wall 70 with respect to the first embodiment, and the other parts are the same as those of the first embodiment. Therefore, only a part different from the first embodiment is used. explain.

As shown in FIGS. 5 and 6, the blower 1 of the second embodiment includes a connecting portion 75 for connecting the guide wall 70 and the separation cylinder 60. A plurality of connecting portions 75 are arranged in the circumferential direction. The number, shape, size, etc. of the connecting portions 75 can be arbitrarily set.
In the second embodiment, the guide wall 70, the separation cylinder 60, and the connecting portion 75 can be integrally configured. Therefore, the man-hours for assembling the guide wall 70 and the separation cylinder 60 can be reduced. Further, the rigidity of the guide wall 70 and the separation cylinder 60 can be increased.

(Third Embodiment)
The third embodiment will be described. In the third embodiment, the number of guide walls 70 is changed with respect to the first embodiment and the like, and the other parts are the same as those in the first embodiment and the like. Therefore, only the parts different from the first embodiment and the like are used. explain.

As shown in FIG. 7, the blower 1 of the third embodiment includes a plurality of

guide walls

701 and 702. The plurality of

guide walls

701 and 702 are arranged so as to overlap each other in the radial direction between the separation cylinder 60 and the bell mouth 50. The number, shape, size, etc. of the plurality of

guide walls

701 and 702 can be arbitrarily set by experiments and the like. By increasing the number of the

guide walls

701 and 702, it is possible to enhance the effect of reducing the variation in the wind speed distribution in the flow path outside the separation cylinder 60. Therefore, it is preferable to increase the number of

guide walls

701 and 702 as the variation in the wind speed distribution in the flow path outside the separation cylinder 60 becomes larger in the state where the blower 1 is not provided with the guide wall. Therefore, in the third embodiment, even if the blower 1 is not provided with the guide wall and the wind speed distribution in the flow path outside the separation cylinder 60 varies widely, the plurality of

guide walls

701 and 702 can be installed. It is possible to reduce the variation in the wind speed distribution and suppress the generation of abnormal noise.

(Fourth Embodiment)
A fourth embodiment will be described. In the fourth embodiment, the configurations of the air introduction box 10, the separation cylinder 60, the guide wall 70, and the like are changed from those of the first embodiment and the like, and the other parts are the same as those of the first embodiment and the like. Only the parts different from the first embodiment and the like will be described.

As shown in FIG. 8, the air introduction box 10 provided in the blower 1 of the fourth embodiment also has an outside air introduction port 11, a first inside air introduction port 12, and a second inside air introduction port 13. Inside the air introduction box 10, a first inside / outside air door 18 and a second inside / outside air door 19 are provided. Both the first inside / outside air door 18 and the second inside / outside air door 19 are composed of rotary doors. The first inside / outside air door 18 is a door for selectively opening / closing the outside air introduction port 11 and the first inside / outside air introduction port 12. The second inside / outside air door 19 is a door that opens / closes the second inside / outside air introduction port 13. Further, the second inside / outside air door 19 introduces the second inside air into a predetermined region 41 of the filter 40 (for example, a region of the filter 40 shown in FIG. 8 on the right side half of the rotation axis Ax of the impeller 30). This is a door for selectively communicating the port 13 and the outside air introduction port 11.

The separation cylinder 60 integrally has a tubular portion 63 and a wind collecting portion 64. The air collecting portion 64 is a portion arranged between the suction port forming portion 24 and the filter 40. The air collecting portion 64 is arranged at a position corresponding to the predetermined region 41 of the filter 40 described above, and introduces the air that has passed through the predetermined region 41 of the filter 40 into the flow path inside the tubular portion 63. ..
The tubular portion 63 is formed integrally with the wind collecting portion 64 and is arranged inside the impeller 30. The tubular portion 63 is arranged inside the impeller 30 at a position shifted to one side in the radial direction. Therefore, in the separation cylinder 60, the central axis CL of the tubular portion 63 and the rotation axis Ax of the impeller 30 are located at different positions. The tubular portion 63 is formed in a flare shape that gradually expands outward in the radial direction as it approaches the air outlet portion 62. The outer edge portion of the tubular portion 63 on the air outlet portion 62 side is provided at a position corresponding to the separation plate 35 of the impeller 30.

As shown in FIG. 9, the guide wall 76 of the fourth embodiment is formed in an arc shape when viewed from the rotation axis Ax direction of the impeller 30. The guide wall 76 is provided in an area of the separation cylinder 60 on the opposite side of the air collecting portion 64. In other words, the guide wall 76 is provided in a region where the distance between the tubular portion 63 of the separation cylinder 60 and the bell mouth 50 is long. The separation cylinder 60 is not provided in a region where the tubular portion 63 of the separation cylinder 60 and the bell mouth 50 are close to each other. The separation cylinder 60 disperses the variation in the wind speed distribution in the region where the distance between the tubular portion 63 of the separation cylinder 60 and the bell mouth 50 is long (in other words, the region where the air collecting portion 64 is not mainly provided). It can be reduced.

As shown in FIG. 8, in the fourth embodiment, the distance L1 between the end 71 on the filter 40 side of the guide wall 76 and the rotation axis Ax of the impeller 30 is on the opposite side of the guide wall 76 from the filter 40. The distance between the end portion 74 of the impeller and the rotation axis Ax of the impeller 30 is longer than L2. As a result, even if the filter 40 is larger than the inner flow path of the bell mouth 50, the guide wall 76 passes through the filter 40 and is sucked into the impeller 30 from a region other than the air collecting portion 64 of the separation cylinder 60. However, it is possible to suppress the flow concentrated in the vicinity of the bell mouth 50. The inner flow path of the bell mouth 50 is a suction port of the impeller 30.

Further, as shown in FIG. 10, the guide wall 76 is provided at a position where the flow velocity of the air flowing through the inner flow path 72 and the flow velocity of the air flowing through the outer flow path 73 are close to each other. As shown by the broken lines 76a and 76b in FIG. 10, the position where the guide wall 76 is provided can be appropriately set by an experiment or the like. Further, the shape and size of the guide wall 76 can be appropriately set by an experiment or the like.
The blower 1 of the fourth embodiment described above can also exhibit the same effects as those of the first embodiment and the like.

(Other embodiments)
The present disclosure is not limited to the above-described embodiment, and can be changed as appropriate. Further, the above-described embodiments are not unrelated to each other, and can be appropriately combined unless the combination is clearly impossible. Further, in each of the above embodiments, it goes without saying that the elements constituting the embodiment are not necessarily essential except when it is clearly stated that they are essential and when they are clearly considered to be essential in principle. No. Further, in each of the above embodiments, when numerical values such as the number, numerical values, amounts, and ranges of the constituent elements of the embodiment are mentioned, when it is clearly stated that they are particularly essential, and in principle, the number is clearly limited to a specific number. It is not limited to the specific number except when it is done. Further, in each of the above embodiments, when referring to the shape, positional relationship, etc. of a component or the like, the shape, unless otherwise specified or limited in principle to a specific shape, positional relationship, etc. It is not limited to the positional relationship.

(1) In each of the above embodiments, the

guide walls

70, 76, 701, and 702, the connecting portion 75, and the separation cylinder 60 are integrally configured, but the present invention is not limited to this. For example, the

guide walls

70, 76, 701, and 702 may be integrally formed with the frame of the bell mouth 50 or the filter 40.

(2) In each of the above embodiments, the scroll casing 20 is arranged on the downstream side of the air introduction box 10, and the impeller 30 and the like are housed therein, but the present invention is not limited to this. The scroll casing 20 may be a casing having a ventilation path having a shape different from that of the scroll.

(3) In each of the above embodiments, the blower 1 has been described as being applied to a vehicle air conditioner, but the present invention is not limited to this. The blower 1 may be applied to a device other than the vehicle air conditioner.

(4) In each of the above embodiments, the first air is referred to as outside air and the second air is referred to as inside air, but the present invention is not limited to this. As the first air and the second air, various gases having different humidity, temperature, composition, etc. may be adopted.

(Summary)
According to the first aspect shown in a part or all of the above-described embodiment, it is a blower capable of simultaneously sucking in the first air and the second air and blowing them out separately, such as an air introduction box and a casing. , Impeller, bell mouth, separator and guide wall. The air introduction box is formed with a first air introduction port into which the first air is introduced and a second air introduction port into which the second air is introduced. The casing is provided on the downstream side of the air introduction box. The impeller sucks at least one of the first air and the second air introduced into the air introduction box into the casing from one side in the rotation axis direction and blows them out in the direction away from the rotation axis. The annular bell mouth is provided between the air introduction box and the impeller and forms a suction port for air sucked from the air introduction box into the impeller. The separation cylinder has a shape that extends radially outward from the air inlet portion arranged on the air introduction box side with respect to the impeller, passing through the inside of the impeller. The guide wall divides the flow path formed between the separation cylinder and the bell mouth into an inner flow path on the separation cylinder side and an outer flow path on the bell mouth side, and air and an outer flow flowing through the inner flow path. Guide the air flowing through the road to the impellers.

According to the second aspect, the blower further includes a filter that collects foreign matter contained in the air flowing from the air introduction box toward the impeller. The guide wall abuts or is adjacent to the impeller side surface of the filter and extends halfway through the radial inner space of the impeller.
According to this, the guide wall can separate the air flowing through the outer flow path and the air flowing through the inner flow path and guide them to the impeller.

According to the third aspect, a plurality of guide walls are arranged so as to overlap in the radial direction between the separation cylinder and the bell mouth.
According to this, it is possible to enhance the effect of reducing the variation in the wind speed distribution in the flow path outside the separation cylinder. Therefore, even if the blower does not have a guide wall and the variation in the wind speed distribution in the flow path outside the separation cylinder is large, by arranging a plurality of guide walls, the variation in the wind speed distribution can be reduced and abnormal noise can be generated. Occurrence can be suppressed.

According to the fourth aspect, the guide wall is provided at a position where the flow velocity of the air flowing through the inner flow path and the flow velocity of the air flowing through the outer flow path are close to each other within the range of the separation cylinder and the bell mouth.
According to this, in this blower, the variation in the wind speed distribution between the outer flow path and the inner flow path in the flow path outside the separation cylinder is reduced, so that the generation of abnormal noise can be suppressed.

According to the fifth viewpoint, the distance between the end of the guide wall on the filter side and the rotating shaft of the impeller is larger than the distance between the end of the guide wall on the opposite side of the filter and the rotating shaft of the impeller. Is far away.
According to this, even if the filter is large with respect to the inner flow path of the bell mouth (that is, the suction port of the impeller), the guide wall allows the air that has passed through the filter to flow concentrated in the vicinity of the bell mouth. Can be prevented.

According to the sixth aspect, the guide wall is formed in a tubular shape, and the diameter of the end portion of the guide wall on the filter side is larger than the diameter of the end portion of the guide wall on the side opposite to the filter.
According to this, even if the filter is large relative to the inner flow path of the bell mouth (that is, the suction port of the impeller), the guide wall can prevent the air passing through the filter from concentrating near the bell mouth. it can.

According to the seventh aspect, the guide wall is formed so that the diameter gradually decreases as the distance from the filter increases.
According to this, even if the filter is large relative to the inner flow path of the bell mouth (that is, the suction port of the impeller), the guide wall prevents the air passing through the filter from concentrating and flowing near the bell mouth. be able to.

According to the eighth aspect, a connecting portion for connecting the guide wall and the separation cylinder is provided.
According to this, it is possible to integrally configure the guide wall and the separation cylinder. Therefore, the man-hours for assembling the guide wall and the separation cylinder can be reduced. In addition, the rigidity of the guide wall and the separation cylinder can be increased.

According to the ninth aspect, the guide wall has a tubular shape or an arc shape when viewed from the rotation axis direction of the impeller.
According to this, in the case where the rotation axis of the impeller and the central axis of the separation cylinder are close to each other, the guide wall has a tubular shape to reduce the variation in the wind speed distribution in the flow path outside the separation cylinder. can do. On the other hand, in the case where the rotation axis of the impeller and the central axis of the separation cylinder are deviated from each other, the distance between the separation cylinder and the bell mouth is formed by making the guide wall arcuate when viewed from the direction of the rotation axis of the impeller. It is possible to reduce the variation in the wind speed distribution in the region where is far away.

Claims

In a blower capable of sucking in the first air and the second air at the same time and blowing them out separately.
An air introduction box (10) in which a first air introduction port (11) into which the first air is introduced and a second air introduction port (12, 13) into which the second air is introduced are formed.
A casing (20) provided on the downstream side of the air introduction box and
An impeller (30) housed in the casing, at least one of the first air and the second air introduced into the air introduction box is sucked from one side in the rotation axis (Ax) direction of the impeller. The impeller that blows out in the direction away from the axis of rotation,
An annular bell mouth (50) provided between the air introduction box and the impeller and forming a suction port for air sucked from the air introduction box into the impeller.
A separation cylinder (60) having a shape that extends radially outward from the air inlet portion (61) arranged on the air introduction box side with respect to the impeller through the inside of the impeller.
The flow path formed between the separation cylinder and the bell mouth is divided into an inner flow path (72) on the separation cylinder side and an outer flow path (73) on the bell mouth side, and the inner flow path is formed. A blower including guide walls (70, 76, 701, 702) for guiding the air flowing through the outer flow path and the air flowing through the outer flow path to the impeller, respectively.
Further provided with a filter (40) for collecting foreign matter contained in the air flowing from the air introduction box toward the impeller.
The blower according to claim 1, wherein the guide wall is in contact with or adjacent to the surface of the filter on the impeller side, and extends halfway in the space inside the impeller in the radial direction.
The blower according to claim 1 or 2, wherein a plurality of the guide walls (701, 702) are arranged so as to overlap each other in the radial direction between the separation cylinder and the bell mouth.
The guide wall is provided at a position within the range of the separation cylinder and the bell mouth so that the flow velocity of the air flowing through the inner flow path and the flow velocity of the air flowing through the outer flow path are close to each other. The blower according to any one of 3.
The distance (L1) between the end portion (71) of the guide wall on the air introduction box side and the rotation axis of the impeller is the end portion (74) of the guide wall on the side opposite to the air introduction box. The blower according to any one of claims 1 to 4, which is farther than the distance (L2) between the impeller and the rotating shaft of the impeller.
The guide wall is formed in a tubular shape, and the diameter (D1) of the end portion of the guide wall on the air introduction box side is the diameter of the end portion of the guide wall on the side opposite to the air introduction box. (D2) The blower according to any one of claims 1 to 5, which is larger than (D2).
The blower according to any one of claims 1 to 6, wherein the guide wall is formed so that the diameter gradually decreases as the distance from the air introduction box increases.
The blower according to any one of claims 1 to 7, further comprising a connecting portion (75) for connecting the guide wall and the separation cylinder.
The blower according to any one of claims 1 to 8, wherein the guide walls (70, 76) are tubular or arcuate when viewed from the rotation axis direction of the impeller.