WO2015079670A1

WO2015079670A1 - Blower

Info

Publication number: WO2015079670A1
Application number: PCT/JP2014/005874
Authority: WO
Inventors: みゆき齋藤; 伸一郎平井; 神谷　知宏
Original assignee: 株式会社デンソー
Priority date: 2013-11-28
Filing date: 2014-11-25
Publication date: 2015-06-04
Also published as: JP6217347B2; JP2015105575A

Abstract

In this blower (10), all suction port rib parts (22) thereof are arranged so that when viewed from the direction of the axial center of a multi-vane fan (12) and when the rotating direction (DRrt) of the multi-vane fan (12) is defined as the forward direction, each forms an angle (θ) of 10-210 degrees inclusive with respect to a reference line segment (Lstd) that connects the axial center (CLf) of the fan with a winding end position (143b) on the inner peripheral surface (143) of a side wall. Therefore, noise generated by the blower (10) can be reduced more than in an arrangement wherein at least one of those multiple suction port rib parts (22) would form an angle outside of said angle range. In addition, even when the arrangement of the suction port rib parts (22) is restricted as viewed from the direction of the axial center (CLf) of the fan, the physical size of the blower (10) is not affected. Therefore, reduction of noise can be achieved without hindering size reduction of the blower (10).

Description

Blower

Cross-reference of related applications

This application is based on Japanese Patent Application No. 2013-246436 filed on Nov. 28, 2013, the disclosure of which is incorporated herein by reference.

The present disclosure relates to a blower that circulates air.

Reducing the noise of the blower has been one of the problems of the blower. Various blowers have been proposed for the problem of noise reduction. For example, a blower disclosed in Patent Document 1 is one of them. The blower of Patent Document 1 includes a fan, a bell mouth that forms a peripheral portion of an air suction port of the fan, and a filter that is provided on the upstream side of the air flow from the bell mouth. And in the air blower of patent document 1, it does not arrange | position so that a filter may orthogonally cross with respect to the rotating shaft center of a fan, but it makes it incline with respect to the rotating shaft center of the fan, and, thereby, a filter is made with respect to a bell mouth. I try to partly leave. By arranging such a filter, noise reduction of the blower is achieved.

JP 2007-191119 A

Incidentally, in recent years, there has been a strong demand for downsizing of blowers, and with the downsizing of blowers, the fans of the blowers have also been downsized. However, even if the fan is downsized, it is necessary to ensure a sufficient amount of air flow. Therefore, with the downsizing of the fan, the wind speed of the air sucked by the fan is increased. As a result, there is a problem that noise is easily generated when the fan sucks air.

For example, it is assumed that the technique disclosed in Patent Document 1 is applied to the problem associated with the downsizing of the blower. However, since the technique of Patent Document 1 is arranged so that the filter is partially separated from the bell mouth, it is necessary to expand the physique of the blower in the axial direction, while achieving downsizing of the blower. It was thought that this was not appropriate for reducing noise.

This indication aims at providing the air blower which can aim at noise reduction so that size reduction may not be prevented in view of the above-mentioned point.

According to one aspect of the present disclosure, the blower includes a multiblade fan that has a plurality of blades around a predetermined axis and rotates around the predetermined axis, and a scroll casing that houses the multiblade fan. The air inlet provided in one axial direction of the predetermined axial center with respect to the multiblade fan, the suction bell mouth portion forming the peripheral portion of the air inlet, and provided radially outside the multiblade fan Provided on the opposite side of the multi-blade fan in the axial direction with respect to the suction bell mouth portion, and a scroll casing having a spiral air passage provided between the inner peripheral surface of the side wall and the multi-blade fan and the inner peripheral surface of the side wall And at least one first rib portion having a plate shape substantially parallel to the axial direction and overlapping the air suction port in the axial direction. The first rib portion extends in the radial direction with respect to the predetermined axis when viewed from the axial direction. When a line segment connecting the predetermined axis center and the winding end position of the inner peripheral surface of the scroll casing in the radial direction is defined as a reference line segment, and the rotation direction of the multiblade fan is defined as a positive direction from the reference line segment, The rib portion is arranged in an angle range of 10 ° or more and 210 ° or less with respect to the reference line segment, and is not arranged in an angle range deviating from the angle range of 10 ° or more and 210 ° or less. .

According to the above-described aspect, the first rib portion has a rotation direction of the multiblade fan of 10 ° or more and 210 ° or less with the rotation direction of the multiblade fan as a positive direction with respect to the reference line segment when viewed from the axial direction of the predetermined axis. Since it is arranged at a position that forms an angle and is not arranged at a position that makes an angle outside the range of 10 ° or more and 210 ° or less, as shown in FIGS. 7 and 8 to be described later, Noise can be reduced. And even if it restrict | limits arrangement | positioning of the 1st rib part when it sees from the axial direction of a predetermined axial center, since it does not affect the physique of an air blower, noise reduction can be aimed at so that size reduction of an air blower may not be prevented.

FIG. 3 is a cross-sectional view taken along the line II of FIG. 2 illustrating the blower of the first embodiment of the present disclosure. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. FIG. 3 is a sectional view taken along the line III-III in FIG. 2. It is the figure which showed the relationship between the frequency of the noise measured in the noise experiment of the air blower of 1st Embodiment, and the noise level. It is the figure which showed the experimental result in the 1st noise experiment of the air blower of 1st Embodiment. It is the figure which showed the experimental result in the 2nd noise experiment of the air blower of 1st Embodiment. It is the figure which showed the experimental result of the rib arrangement | positioning angle vicinity of 0 degree in the 3rd noise experiment of the air blower of 1st Embodiment. It is the figure which showed the experimental result of the rib arrangement | positioning angle 180 degree vicinity in the 3rd noise experiment of the air blower of 1st Embodiment. It is sectional drawing which shows the air blower of 2nd Embodiment of this indication. It is sectional drawing which showed the modification of the air blower of 2nd Embodiment.

Hereinafter, a plurality of modes for carrying out the present disclosure will be described with reference to the drawings. In each embodiment, parts corresponding to the matters described in the preceding embodiment may be denoted by the same reference numerals, and redundant description may be omitted. When only a part of the configuration is described in each mode, the other modes described above can be applied to the other parts of the configuration. Not only combinations of parts that clearly show that combinations are possible in each embodiment, but also combinations of the embodiments even if they are not explicitly stated unless there is a problem with the combination. Is also possible.
(First embodiment)
FIG. 1 is a view of the blower 10 of the first embodiment as viewed from the axial direction, and is a cross-sectional view taken along the line II of FIG. 2 is a cross-sectional view taken along the line II-II in FIG. The blower 10 shown in FIGS. 1 and 2 is provided, for example, in a vehicle interior air conditioning unit that performs air conditioning of the vehicle interior, and distributes outside air or interior air to the heat exchanger accommodated in the vehicle interior air conditioning unit. An arrow DR1 in FIG. 2 indicates the vehicle vertical direction DR1. In FIG. 1, the filter 18 is omitted in order to make the drawing easier to see. Moreover, the thick curved arrow of FIG. 1 represents the flow of the air suck | inhaled to the air inlet 14a.

As shown in FIGS. 1 and 2, the blower 10 is a centrifugal multiblade fan, that is, a sirocco fan. The blower 10 is driven by an electric motor (not shown) and rotates around a predetermined fan axis CLf, and a scroll casing 14 (hereinafter abbreviated as a casing 14) that houses the multiblade fan 12. ), An air guide portion 16 and a filter 18. In the following description, the axial direction of the fan axis CLf, which is a predetermined axis, is abbreviated as the fan axis CLf direction.

The casing 14 is made of resin, for example, and has a suction bell mouth portion 141 and a side wall portion 142. The suction bell mouth portion 141 forms a peripheral portion of an air suction port 14a provided on one side of the multi-blade fan 12 in the direction of the fan axis CLf in the casing 14 so that air flowing into the air suction port 14a can be obtained. It leads to the multiblade fan 12. And the suction bell mouth part 141 has comprised the shape which expanded to the outer side of the casing 14 so that the air inlet 14a might be surrounded. In the casing 14, an electric motor for rotating the multiblade fan 12 is provided on the other side of the multiblade fan 12 in the direction of the fan axis CLf, that is, on the side opposite to the air suction port 14 a side.

The side wall 142 of the casing 14 is a spiral wall around the fan axis CLf and has a side wall inner peripheral surface 143 facing the inside of the casing 14. The side wall inner peripheral surface 143 is disposed on the radially outer side of the multi-blade fan 12, and the side wall inner peripheral surface 143 and the multi-blade fan 12 define an air passage 14b therebetween. The air passage 14b has a spiral shape around the fan axis CLf, and collects air blown from the multiblade fan 12 radially outward.

As shown in FIG. 3, the air passage 14 b provided in the casing 14 is arranged from the winding start position 143 a to the winding end position 143 b of the side wall inner peripheral surface 143, and guides air to the air outlet 144 of the casing 14. It has become. 3 is a cross-sectional view taken along the line III-III in FIG.

The winding start position 143 a of the side wall inner peripheral surface 143 is a start position of the side wall inner peripheral surface 143 in the rotation direction according to the rotation direction DRrt of the multiblade fan 12, and the winding end position 143 b is the position of the side wall inner peripheral surface 143. It is the end position.

The radius Rin of the side wall inner peripheral surface 143 around the fan axis CLf, that is, the distance Rin from the fan axis CLf to the side wall inner peripheral surface 143 is the smallest at the winding start position 143a, and from the winding start position 143a. It gradually increases toward 143b. For example, the rotation angle θin rotated from the winding start position 143a to the rotation direction DRrt of the multiblade fan 12 around the fan axis CLf between the winding start position 143a and the winding end position 143b on the side wall inner peripheral surface 143 is defined. In this case, the radius Rin of the side wall inner peripheral surface 143 changes as a function of the rotation angle θin.

Further, as shown in FIG. 2, the casing 14 further includes an inlet side wall 145 on the air inlet 14 a side, and the side opposite to the fan axis CLf direction with the multiblade fan 12 sandwiched between the inlet side wall 145. And an unillustrated side wall portion of the suction port (not shown) and a nose tip 146 (see FIG. 3). The suction inlet side wall portion 145 extends outward in the radial direction of the suction bell mouth portion 141. As shown in FIG. 3, the nose tip 146 is provided at the winding start position 143 a of the side wall inner peripheral surface 143.

The multiblade fan 12 shown in FIG. 2 is a centrifugal multiblade fan having plate-like blades 121 arranged around the fan axis CLf. The multiblade fan 12 is driven to rotate by an electric motor, so that air is sucked into the multiblade fan 12 from the air suction port 14 a and the sucked air is blown out radially outward of the multiblade fan 12. It has become. That is, the multiblade fan 12 blows out the air sucked from the air inlet 14a of the casing 14 to the air passage 14b.

The wind guide portion 16 is connected at one end portion 161 to the air suction port 14 a side of the casing 14, that is, to the outside of the suction port side wall portion 145. That is, the air guide portion 16 is disposed on the upstream side of the air flow from the air suction port 14a. The air guide section 16 has an air guide path 16 a that guides air to the air intake port 14 a inside the air guide section 16. The cross section of the air guide path 16a is larger than the air suction port 14a and has a rectangular shape.

Further, a filter 18 is provided in the middle of the air guide path 16a in the direction of the fan axis CLf so as to capture foreign substances contained in the air flow in the air guide path 16a. The filter 18 is made of a non-woven fabric that can be ventilated, and is disposed so as to cover the entire passage section of the air guide passage 16a. That is, all of the air passing through the air guide path 16 a passes through the filter 18 and is then sucked into the air inlet 14 a of the casing 14.

Further, the blower 10 includes a plurality of inlet rib portions 22 (first rib portions) and a plurality of bell mouth peripheral rib portions 24 (second rib portions) provided in the air guide passage 16a. The inlet rib portion 22 and the bell mouth peripheral rib portion 24 support the filter 18 provided upstream of the

rib portions

22 and 24 against the air flow sucked into the air inlet port 14a. To do. That is, the inlet rib portion 22 and the bell mouth peripheral rib portion 24 function as a filter support member. As shown in FIGS. 1 and 2, rib portions other than the suction port rib portion 22 and the bell mouth peripheral rib portion 24 are provided between the filter 18 and the air suction port 14a in the air flow direction. Absent.

Since all the inlet rib portions 22 are provided in the air guide passage 16a, in other words, they are provided on the side opposite to the multi-blade fan 12 side in the fan shaft center CLf direction with respect to the suction bell mouth portion 141. . The suction rib portion 22 is integrally fixed to the suction bell mouth portion 141. Specifically, in the present embodiment, three suction port rib portions 22 are provided.

Further, the suction port rib portion 22 has a flat plate shape, and the plate width (side wall) of the suction port rib portion 22 faces the fan axis CLf direction. In other words, the suction port rib portion 22 having a flat plate shape is substantially parallel to the direction of the fan axis CLf. As shown in FIG. 1, the inlet rib portion 22 is disposed so as to overlap with the air outlet 144 in the fan axis CLf direction, and the diameter of the fan axis CLf when viewed from the fan axis CLf direction. The suction bell mouth part 141 extends in the direction. That is, the suction port rib portion 22 extends radially outward from the fan shaft center CLf.

As shown in FIGS. 1 and 2, the bellmouth peripheral rib portion 24 is disposed on the radially outer side of the suction bellmouth portion 141 in the air guide passage 16a. The bell mouth peripheral rib portion 24 is orthogonal to a reference line segment Lstd (see FIG. 3) connecting the fan shaft center CLf and the winding end position 143b of the side wall inner peripheral surface 143 when viewed from the fan shaft center CLf direction. In the direction DRrc, the air intake port 14a is disposed outside the width WDi.

Further, the bell mouth peripheral rib portion 24 has a flat plate shape, and the plate width (side wall) of the bell mouth peripheral rib portion 24 faces the fan axis CLf direction. In other words, the bellmouth peripheral rib portion 24 having a flat plate shape is substantially parallel to the fan shaft center CLf direction. The bell mouth peripheral rib portion 24 is integrally fixed to the air guide portion 16 and the inlet side wall portion 145 of the casing 14. Specifically, in the present embodiment, seven bellmouth peripheral rib portions 24 are provided.

Then, the

rib portions

22, 24 are such that all of the upstream end 221 of the inlet rib portion 22 and all of the upstream end 241 of the bell mouth peripheral rib portion 24 are at the same position, for example, in the fan axis CLf direction. All of them are provided.

As shown in FIG. 1, the bell mouth peripheral rib portion 24 has one end portion 242 located at one end in a direction orthogonal to the fan axis CLf and the other end portion 243 farther from the air inlet 14a than the one end portion 242. And.

The bell mouth peripheral rib portion 24 is inclined with respect to a line segment L01 connecting the one end portion 242 and the fan shaft center CLf when viewed from the fan shaft center CLf direction. More specifically, the other end 243 of the bell mouth peripheral rib portion 24 is the rotation direction DRrt (see FIG. 3) of the multiblade fan 12 with respect to the line segment L01 when viewed from the fan axis CLf direction. It is located on the opposite side (reverse rotation side). Furthermore, the bell mouth peripheral rib portion 24 is in contact with the nose tip 146 (see FIG. 3) and parallel to the line segment L02 (see FIG. 3) intersecting the fan shaft center CLf when viewed from the fan shaft center CLf direction. It is arranged to be.

Here, a plurality of noise experiments are performed on the relationship between the arrangement of the

rib portions

22 and 24 and the noise of the blower 10, and the

rib portions

22 and 24 are arranged so that the noise is reduced based on the noise experiment. Has been. The noise experiment will be described below.

First, in the first noise experiment, the suction port rib portion 22 and the bell mouth peripheral rib portion 24 are within the distance between each of all the suction port rib portions 22 and each of the bell mouth peripheral rib portions 24. The shortest shortest distance L1 (see FIG. 1) was changed, and the noise of the blower 10 was measured.

Since the noise directly measured in this noise experiment is the noise of the entire blower 10, it is represented by the relationship between the noise frequency and the noise level as shown in FIG. In FIG. 4, the unit of frequency is “Hz”, and the unit of noise level is dB (A). However, the frequency of noise related to the shortest distance L1 between the

rib portions

22 and 24 can be calculated from the fan rotation speed of the multiblade fan 12 and the number of blades 121, and is the specific frequency FQ1 in FIG. Is known. The fan rotation speed in this noise experiment is constant at 2500 rpm.

Therefore, in the first noise experiment, the relationship between the noise peak value NZp at the specific frequency FQ1 and the shortest distance L1 between the

rib portions

22 and 24 was measured. The measurement result is shown in FIG. According to the measurement result of FIG. 5, the noise peak value NZp decreases as the shortest distance L1 between the

rib portions

22 and 24 increases. However, if the shortest distance L1 is 20 mm or more, the noise peak value NZp decreases most. It turns out that it does not change. Therefore, from the viewpoint of reducing the noise of the blower 10, it can be said that in the first noise experiment, the shortest distance L1 between the

rib portions

22 and 24 is preferably 20 mm or more. And further from FIG. 5, it can be said that the shortest distance L1 is more preferably 30 mm or more.

From the result of the first noise experiment described above, in the blower 10 of the present embodiment, the bell mouth peripheral rib portion 24 is viewed from the fan axis CLf direction as shown in FIG. The portion closest to the inlet rib portion 22 is disposed so as to be separated from the inlet rib portion 22 by 20 mm or more. In other words, the blower 10 does not have a portion where the distance between the inlet rib portion 22 and the bell mouth peripheral rib portion 24 is less than 20 mm.

Next, the second noise experiment will be described. In the second noise experiment, the shortest distance L2 (see FIG. 1) between the bell mouth peripheral rib portion 24 closest to the air suction port 14a and the air suction port 14a among all the bell mouth peripheral rib portions 24 is changed. The noise of the blower 10 was measured.

Also in the second noise experiment, the specific frequency FQ1 (see FIG. 4) is calculated as in the first noise experiment, and the relationship between the noise peak value NZp at the specific frequency FQ1 and the shortest distance L2 is measured. did. The measurement result is shown in FIG.

According to the measurement result of FIG. 6, the noise peak value NZp decreases as the shortest distance L2 between the bell mouth peripheral rib portion 24 and the air suction port 14a increases. However, if the shortest distance L2 is 25 mm or more, the noise is reduced. It can be seen that the peak value NZp is small but hardly changes. Therefore, it can be said that the shortest distance L2 is preferably 25 mm or more in the second noise experiment from the viewpoint of noise reduction of the blower 10. Further, from FIG. 6, it can be said that the shortest distance L2 is more preferably 30 mm or more. Note that the fan rotation speed in the second noise experiment is also constant at 2500 rpm.

From the results of the second noise experiment described above, in the blower 10 of the present embodiment, the bell mouth peripheral rib portion 24 is viewed from the fan axis CLf direction as shown in FIG. The part closest to the air suction port 14a in the whole is arranged to be separated from the air suction port 14a by 25 mm or more. In other words, the blower 10 does not have a portion where the distance between the bell mouth peripheral rib portion 24 and the air inlet 14a is less than 25 mm.

Next, the third noise experiment will be described. In the third noise experiment, the noise of the blower 10 is measured by changing the rib arrangement angle θr (see FIG. 1) formed by the inlet rib portion 22 with respect to the reference line segment Lstd when viewed from the fan shaft center CLf direction. did. The positive direction of the rib arrangement angle θr is the same as the rotational direction DRrt of the multiblade fan 12 (see FIG. 3).

Also in the third noise experiment, the specific frequency FQ1 (see FIG. 4) is calculated as in the first and second noise experiments, and the noise peak value NZp and the rib arrangement angle θr at the specific frequency FQ1 are calculated. The relationship was measured. The measurement results are shown in FIGS. FIG. 7 shows the measurement result in the vicinity of 0 ° of the rib arrangement angle θr, and FIG. 8 shows the measurement result in the vicinity of 180 ° of the rib arrangement angle θr.

7 that the noise peak value NZp decreases as the rib arrangement angle θr increases, but the noise peak value NZp hardly changes if the rib arrangement angle θr is 10 ° or more. Further, from the measurement results of FIG. 8, it can be seen that the noise peak value NZp decreases as the rib arrangement angle θr decreases, but the noise peak value NZp hardly changes if the rib arrangement angle θr is 210 ° or less. It has been confirmed that the noise peak value NZp hardly changes within the range of 10 to 210 ° of the rib arrangement angle θr. Therefore, from the viewpoint of reducing the noise of the blower 10, in the third noise experiment, it can be said that the rib arrangement angle θr is preferably in the range of 10 ° to 210 °. The fan rotation speed in this third noise experiment is constant at 3000 rpm.

From the result of the second noise experiment described above, in the blower 10 of the present embodiment, all the inlet rib portions 22 are viewed from the direction of the fan axis CLf as shown in FIG. 3), the rotation direction DRrt of the multi-blade fan 12 is set to a position that forms an angle θr of 10 ° or more and 210 ° or less with the rotation direction DRrt as the positive direction. Further, none of the inlet rib portions 22 is arranged at a position that forms an angle outside the angular range of 10 ° or more and 210 ° or less.

As described above, according to the present embodiment, all the suction port rib portions 22 are connected to the fan shaft center CLf and the winding end position 143b of the side wall inner peripheral surface 143 when viewed from the fan shaft center CLf direction. The multi-blade fan 12 is arranged so as to form an angle θr of 10 ° or more and 210 ° or less with the rotational direction DRrt of the multiblade fan 12 as a positive direction with respect to the line segment Lstd. Therefore, as can be seen from FIG. 7 and FIG. 8, compared with a configuration in which at least one of the plurality of inlet rib portions 22 is arranged to form an angle outside the angular range, the noise of the blower 10 is reduced. Can be reduced. And even if the arrangement of the inlet rib portion 22 when viewed from the direction of the fan shaft center CLf is limited, the physique of the blower 10 is not affected. Therefore, it is possible to reduce noise so as not to prevent downsizing of the blower 10. it can.

Further, according to the present embodiment, the bell mouth peripheral rib portion 24 is located in the whole bell mouth peripheral rib portion 24, that is, all the bell mouth peripheral ribs when viewed from the fan axis CLf direction as shown in FIG. The part closest to the air suction port 14a among the entire parts of each part 24 is arranged so as to be separated from the air suction port 14a by 25 mm or more. Therefore, as can be seen from FIG. 6, the noise of the blower 10 is reduced as compared with the configuration in which the distance between the bell mouth peripheral rib portion 24 and the air inlet 14 a is less than 25 mm. can do.

Further, according to the present embodiment, the bell mouth peripheral rib portion 24 is formed on the inlet rib portion 22 in the bell mouth peripheral rib portion 24 as a whole when viewed from the fan axis CLf direction as shown in FIG. The closest part is disposed so as to be 20 mm or more away from the inlet rib part 22. Therefore, as can be seen from FIG. 5, the noise of the blower 10 is reduced compared to a configuration in which the distance between the inlet rib portion 22 and the bell mouth peripheral rib portion 24 is less than 20 mm. Can be reduced.

Further, according to the present embodiment, when the bell mouth peripheral rib portion 24 is viewed from the direction of the fan axis CLf, the other end portion 243 of the bell mouth peripheral rib portion 24 connects the one end portion 242 and the fan axis CLf. It arrange | positions so that it may be located in the rotation direction DRrt (refer FIG. 3) of the multiblade fan 12 on the opposite side (reverse rotation side) with respect to the connecting line segment L01 (refer FIG. 1). Accordingly, the bell mouth peripheral rib portion 24 is disposed around the air suction port 14a so as to follow the air flow sucked into the air suction port 14a. Therefore, it is possible to arrange the bell mouth peripheral rib portion 24 so that air flow disturbance such as vortex due to the bell mouth peripheral rib portion 24 does not easily occur.

Further, according to the present embodiment, the bell mouth peripheral rib portion 24 is in contact with the nose tip portion 146 (see FIG. 3) and intersects the fan shaft center CLf when viewed from the fan shaft center CLf direction. Therefore, noise reduction can be achieved. This is because it has been experimentally found that such arrangement of the bell mouth peripheral rib portion 24 is effective in reducing noise.

Further, according to the present embodiment, the inlet rib portion 22 and the bell mouth peripheral rib portion 24 are provided on the air flow upstream side of the inlet rib portion 22 and the bell mouth peripheral rib portion 24 in the air guide passage 16a. The filter 18 is supported against the flow of air sucked into the air suction port 14a. Therefore, it is possible to install the soft filter 18 in the air guide path 16a as it is without reinforcing it with a filter frame or the like.
(Second Embodiment)
Next, a second embodiment of the present disclosure will be described. In the present embodiment, differences from the first embodiment will be mainly described, and the same or equivalent parts as those in the first embodiment will be omitted or simplified.

FIG. 9 is a cross-sectional view of the blower 10 of the present embodiment as viewed from the direction of the fan axis CLf, and corresponds to FIG. As can be seen by comparing FIG. 1 and FIG. 9, unlike the first embodiment, the bell mouth peripheral rib portion 24 is not a flat plate in the blower 10 of the present embodiment. Specifically, each of the bell mouth peripheral rib portions 24 of the present embodiment has a rotational direction DRrt of the multiblade fan 12 around the fan axis CLf (FIG. 3) when viewed from the fan axis CLf direction as shown in FIG. Curved to swell.

More specifically, as shown in FIG. 9, the bellmouth peripheral rib portion 24 has one surface 244 and another surface 245 that are orthogonal to the thickness direction of the bellmouth peripheral rib portion 24. The bellmouth peripheral rib portion 24 is inclined with respect to the radial direction around the fan axis CLf. The inclination is such that one surface 244 of the bellmouth peripheral rib portion 24 is the other surface 245 of the bellmouth peripheral rib portion 24. Rather than the fan shaft center CLf. In other words, one surface 244 of the bell mouth peripheral rib portion 24 faces the radially inner side of the fan axis CLf, and the other surface 245 of the bell mouth peripheral rib portion 24 faces the radially outer side of the fan shaft center CLf. The bell mouth peripheral rib portion 24 is curved so that the one surface 244 is recessed and the other surface 245 swells when viewed from the fan axis CLf direction.

According to the present embodiment, all the bellmouth peripheral rib portions 24 have a diameter of the fan shaft center CLf that is larger than the other surface 245 in one surface 244 of the bellmouth peripheral rib portion 24 when viewed from the fan shaft center CLf direction. It arrange | positions so that it may face in the direction inner side, the one surface 244 is dented and the other surface 245 swells. Accordingly, it is possible to arrange the bell mouth peripheral rib portion 24 along the air flow sucked into the air suction port 14a as compared with the case where the bell mouth peripheral rib portion 24 has a flat plate shape. Therefore, it is possible to arrange the bellmouth peripheral rib portion 24 so that air flow disturbance due to the bellmouth peripheral rib portion 24 hardly occurs.

In each of the above-described embodiments, a plurality of the inlet rib portions 22 are provided, but may be one if it can be fixed in the air guide passage 16a. Similarly, the bell mouth peripheral rib portion 24 may be one sheet as long as it can be fixed in the air guide path 16a.

In the second embodiment described above, the bell mouth peripheral rib portions 24 are arranged in two rows, one row on each side across the air suction port 14a, and the bell mouth peripheral rib portions 24 are arranged in each row. Although they are the same size as each other, as shown in FIG. 10 showing a modified example of the blower 10 with respect to FIG. 9, the bell mouth peripheral rib portion 24 is disposed such that the disposition position thereof is separated from the fan shaft center CLf in the radial direction. It may be bigger.

In each of the embodiments described above, the installation direction of the blower 10 is as indicated by the arrow DR1 in FIG. 2, but the blower 10 may be installed in a direction different from the direction shown in FIG.

In each of the above-described embodiments, the blower 10 is used in a vehicle interior air conditioning unit that performs air conditioning in the vehicle interior, but may be used for other purposes.

In each of the above-described embodiments, the inlet rib portion 22 and the bell mouth peripheral rib portion 24 are provided to support the filter 18 in the air guide passage 16a, but for purposes other than supporting the filter 18. It may be provided.

In each of the embodiments described above, the suction port rib portion 22 and the bell mouth peripheral rib portion 24 have the same height in the direction of the fan axis CLf, but the

individual rib portions

22 and 24 have different heights. It may be.

Note that the present disclosure is not limited to the above-described embodiment, and can be appropriately changed within the scope described in the claims. In each of the above-described embodiments, it is needless to say that elements constituting the embodiment are not necessarily essential unless explicitly stated as essential and clearly considered essential in principle. Yes. Further, in each of the above embodiments, when numerical values such as the number, numerical value, quantity, range, etc. of the constituent elements of the embodiment are mentioned, it is clearly limited to a specific number when clearly indicated as essential and in principle. The number is not limited to the specific number except for the case. In each of the above embodiments, when referring to the material, shape, positional relationship, etc. of the constituent elements, etc., unless otherwise specified, or in principle limited to a specific material, shape, positional relationship, etc. The material, shape, positional relationship, etc. are not limited.

Claims

A multiblade fan (12) having a plurality of blades (121) around a predetermined axis (CLf) and rotating around the predetermined axis;
A scroll casing that houses the multi-blade fan, wherein the multi-blade fan is provided with an air suction port (14a) provided at one of the axial directions of the predetermined axis, and a peripheral portion of the air suction port. Suction bell mouth portion (141), a side wall inner peripheral surface (143) provided on the radially outer side of the multi-blade fan, and a spiral provided between the multi-blade fan and the side wall inner peripheral surface A scroll casing (14) having a shaped air passage (14b);
At least one which is provided on the opposite side to the multi-blade fan in the axial direction with respect to the suction bell mouth portion, has a plate shape substantially parallel to the axial direction, and overlaps the air suction port in the axial direction. A first rib portion (22) of sheets,
The first rib portion extends in a radial direction with respect to the predetermined axis when viewed from the axial direction;
A line segment connecting the predetermined axis and the winding end position (143b) of the inner peripheral surface of the side wall of the scroll casing in the radial direction is defined as a reference line segment (Lstd), and from the reference line segment, the multiblade fan When the rotational direction (DRrt) is defined as a positive direction, the first rib portion is disposed in an angle range (θr) of 10 ° or more and 210 ° or less with respect to the reference line segment, and 10 ° or more thereof. And the air blower which is not arrange | positioned in the angle range remove | deviated from the angle range of 210 degrees or less.
A wind guide portion (16) connected to the air suction port of the scroll casing and having a wind guide path (16a) for guiding air to the air suction port;
And at least one second rib portion (24) having a plate shape substantially parallel to the axial direction, arranged radially outside the suction bell mouth portion in the air guide passage,
2. The blower according to claim 1, wherein when viewed from the axial direction, a distance between a portion of the second rib portion closest to the air suction port and the air suction port is 25 mm or more.
The blower according to claim 2, wherein when viewed from the axial direction, a distance between a portion closest to the first rib portion in the entire second rib portion and the first rib portion is 20 mm or more.
A wind guide portion (16) connected to the air suction port of the scroll casing and having a wind guide path (16a) for guiding air to the air suction port;
And at least one second rib portion (24) having a plate shape substantially parallel to the axial direction, arranged radially outside the suction bell mouth portion in the air guide passage,
The blower according to claim 1, wherein when viewed from the axial direction, a distance between a portion closest to the first rib portion in the entire second rib portion and the first rib portion is 20 mm or more.
The second rib portion has one end portion (242) located on one side in a direction orthogonal to the predetermined axis, and the other end portion (243) located on the other side,
The distance between the air inlet and the other end is longer than the distance between the air inlet and the one end,
When viewed from the axial direction, the other end portion is disposed so as to be located on the reverse rotation side in the rotation direction of the multiblade fan with respect to a line segment (L01) connecting the one end portion and the predetermined axis. The blower according to any one of claims 2 to 4, wherein the blower is provided.
The scroll casing has a nose tip (146) provided at a winding start position (143a) of the inner peripheral surface of the side wall,
The said 2nd rib part is arrange | positioned so that it may be parallel to the line segment (L02) extended from the said predetermined axial center while contacting the said nose front-end | tip part when it sees from the said axial direction. The air blower as described in any one.
The second rib portion has one surface (244) and the other surface (245) orthogonal to the thickness direction of the second rib portion,
The one surface of the second rib portion faces the radially inner side, the other surface of the second rib portion faces the radially outer side,
The blower according to claim 5 or 6, wherein when the second rib portion is viewed from the axial direction, the one surface is recessed and the other surface is expanded.
The first rib portion and the second rib portion include a filter (18) provided on the upstream side of the air flow with respect to the first rib portion and the second rib portion in the air guide passage. The blower according to any one of claims 2 to 7, wherein the blower is supported against a flow of air sucked into the fan.