WO2011148578A1 - Air blowing unit for vehicle - Google Patents

Abstract

Provided is an air blowing unit for a vehicle such that there is adopted an air back-flow prevention means for preventing the flow of air which flows back through a gap between the bottom surface of an impeller and the upper surface of a motor flange, that in spite of the above, the dimensions of this gap are maintained in an optimal manner, that moreover, restrictions are imposed on the generation of noise and the stagnation of moisture, and that furthermore, the configuration of the air blowing unit is suitable for raising air pressure in a scroll case. A protrusion (20) is protuberantly formed as an air back-flow prevention means inside a second wall section (17) that is located on the opposite side to a first wall section (16) wherein there is formed an air suction port (5) of the case (4) of the air blowing unit (1) for the vehicle. This protrusion (20) is located at a position radially outward from an impeller (2) in such a way that there is formed a predetermined gap between the protrusion (20) and the radially outer end of the impeller (2). Furthermore, the protrusion surface opposite to the impeller (2) is an inclined surface (20a) which is set in such a way as to be parallel to the flow of air (50) that moves into an air blowing path (15) from the impeller (2).

Description

Ventilation unit for vehicles

The present invention relates to a blower unit used for vehicles such as a vehicle air conditioner and a vehicle heating element cooling device.

A blower unit used for a vehicle such as a vehicle air conditioner or a vehicle heating element cooling device includes, for example, an impeller that generates an air flow by rotation, as shown in Patent Document 1 and Patent Document 2, and the like. Basically, a motor for rotationally driving the impeller, a case, particularly a scroll case part mainly containing a peripheral wall formed around the impeller and accommodating the impeller, and a motor flange to which the motor is attached It is configured. The blower unit rotates the impeller with a motor so that air is sucked into the scroll case portion from the air suction opening that is opened in the scroll case portion, and the air pressure in the scroll case portion is increased. It is possible to discharge air from the air discharge port that is open at the top.

When the vehicle blower unit has the above configuration and action, as pointed out in Patent Document 1, it is formed between the bottom surface of the impeller and the top surface of the motor flange constituting the case. As the air passes through the gap space, air flows backward from the relatively high air pressure part (air flow path) in the scroll case part toward the relatively low air pressure part (air suction port). It is known that there is a possibility that the air blowing efficiency of the fan may be reduced.

A smaller clearance space between the bottom surface of the impeller and the top surface of the motor flange is preferable from the viewpoint of increasing the pressure of the discharged air, but the impeller and the motor flange collide due to vibration in the axial direction of the rotation shaft of the motor. In addition, it is necessary to secure a predetermined reference value dimension from the viewpoint of avoiding the risk of impeller rotation locking due to foreign matter caught in the gap between the impeller and the motor.

In addition, in the case of a vehicle air blower unit, even if there is intrusion of moisture such as rain water or snow from the outside of the vehicle or the vehicle is stopped for a long time in an environment where the temperature is below freezing, When it is required that the function can be maintained, a predetermined dimension is not secured in a gap space formed between the bottom surface of the impeller and the top surface of the motor flange, or between the bottom surface of the impeller and the top surface of the motor flange. If the gap space formed in the space has a complicated shape, moisture may stay in the gap space, and if this moisture freezes, the impeller is locked and does not rotate even if the motor is driven. Depending on the situation, problems that could lead to fire are also expected. From the viewpoint of avoiding the risk of impeller rotation lock caused by freezing of moisture that has entered in this way, it is necessary to ensure the dimension of the predetermined reference value in the gap space.

In this regard, in the centrifugal blower disclosed in Patent Document 1, a cylindrical rib projecting from the upper surface of the motor flange toward the impeller side, and the motor from the bottom surface of the impeller so that the outer diameter dimension is smaller than the inner diameter dimension of the flange side rib. By combining with the cylindrical ribs that protrude from the flange side, a labyrinth structure is created in which the clearance space between the bottom surface of the impeller and the top surface of the motor flange is a complex area from the radially outer side to the radially inner side of the impeller. In order to prevent the backflow of air. However, in the centrifugal blower of Patent Document 1, the gap space formed between the bottom surface of the impeller and the top surface of the motor flange is narrow and has a complicated structure due to the cylindrical rib formed on the motor flange side or the impeller side. Therefore, there are high risks of collision between the impeller and the motor flange due to vibration, rotation locking of the impeller, and the like.

On the other hand, as shown in the centrifugal blower of Patent Document 2, the bottom surface of the impeller and the motor are formed by projecting a cylindrical rib on the impeller side at a portion radially outside the impeller on the upper surface of the motor flange. Avoiding a complicated labyrinth structure between the top surface of the flange and avoiding a backflow of air while maintaining a predetermined reference dimension in the clearance space between the bottom surface of the impeller and the top surface of the motor flange. It tries to prevent and limit the risk of impeller rotation lock. As shown in FIG. 8 of the present application, the configuration shown in the centrifugal blower of Patent Document 2 is arranged on the side of the impeller 101 on the portion that is radially outward from the impeller 101 on the upper surface of the scroll case portion 100 instead of the motor flange. By forming the cylindrical rib 102 projecting in the air, the back space of the air is prevented while ensuring the predetermined reference value in the gap space 103 between the bottom surface of the impeller 101 and the top surface of the scroll case portion 100. It is possible to suppress the risk of locking the rotation of the impeller 101.

Japanese Patent No. 4185654 JP 2006-46112 A

However, in the configuration of the blower unit shown in FIG. 8B of the present application, because the cylindrical rib 102 protrudes from the flow path of the air 104 that flows from the impeller 101 toward the outer side in the radial direction of the impeller 101, The flow of the air 105 swirls outside the rib 102 in the radial direction of the impeller 101, which may cause problems such as increase in noise and decrease in air blowing efficiency. This also occurs in the air blowing unit.

Accordingly, the present invention provides a backflow prevention means for preventing the backflow of air into the clearance space at a position where the clearance space between the bottom surface of the impeller and the top surface of the motor flange can suppress the risk of locking the rotation of the impeller. It is an object of the present invention to provide a vehicle blower unit having a configuration suitable for suppressing the generation of noise and the retention of moisture due to the adoption of the backflow prevention means, and also for boosting the air in the scroll case portion. To do.

The vehicle blower unit according to the present invention includes a blower having an impeller and a motor for rotating the impeller by a rotation shaft, and includes an impeller of the blower, and includes the scroll case portion from the start to the end of winding. A case provided with a scroll case portion in which a blower passage that extends for a while toward the radially outer side of the impeller is formed, and the first wall portion located on one side of the impeller in the axial direction of the case includes An air suction opening for sucking air into the case from the outside is opened, and an air outlet for blowing air out of the case is opened at a winding end side portion of the scroll case portion. In the air blowing unit, air backflow prevention means is provided inside the second wall portion located on the other side of the impeller in the axial direction of the case. The air backflow prevention means is located with a predetermined gap between the impeller radially outer end and the impeller radially outer end than the impeller radially outer end, Adjusting the flow of air moving from the radially outer side of the impeller into the air passage so that the air moving into the air passage can smoothly flow toward the radially outer side of the impeller. It is characterized (claim 1). Here, the second wall portion may be a wall portion of the scroll case portion, a wall portion of the motor flange, or a wall portion of another member constituting the case.

Thus, even if there is a gap space having a predetermined reference value between the bottom surface of the impeller and the upper surface of the second wall portion, the air suction port passes through this gap from the air passage by the air backflow prevention means. As a result, the flow of air to flow back to the side is eliminated, and when the air moves into the air passage, air is prevented from swirling due to the presence of the air backflow prevention means, and this air backflow prevention means Even if there is a gap, the gap space between the bottom surface of the impeller and the upper surface of the second wall portion such as the motor flange is not complicated, so that moisture does not easily stay in this gap space. Is never locked.

Here, the air backflow prevention means is configured to have a protrusion protruding into the air passage, and the surface of the protrusion that is located on the opposite side of the impeller is further away from the rotation shaft. The wall surface of the second wall is an inclined surface that is inclined in a direction approaching the inner surface other than the protruding portion (claim 2). The protrusion is formed by bending the second wall portion into the air passage even if it is formed in the air passage so as to increase its thickness relative to the second wall portion. Also good.

Thereby, the protrusion of the air backflow prevention means has an inclined surface on the side opposite to the impeller, so that the airflow from the impeller is prevented from swirling even if the air backflow prevention means is provided in the air passage, and By adjusting the inclination direction of the inclined surface of the protrusion in the same direction as the flow direction of the air flowing from the air suction port to the outer side in the radial direction of the impeller, the air flowing to the outer side in the radial direction of the impeller is protruded. The flow extending into the air passage is strengthened by using the inclined surface of the portion as a guide, and between the projection and the radial end of the impeller between the bottom of the impeller and the upper surface of the second wall such as a motor flange. An attempt to flow into the gap space is suppressed.

The protrusion of the air backflow prevention means has a top on the first wall portion side, and the top of the top and the impeller of the impeller is radially outside of the impeller and in the axial direction of the impeller. The end portion located on the side of the wall portion 2 is substantially in the same position when viewed from the radial direction side of the impeller (Claim 3). Here, the top part of the projection part may be the same position as the first wall side surface of the end part located on the second wall part side of the impeller in the radial direction and on the second wall part side in the axial direction of the impeller. The first wall portion of the impeller may be the same position as the second wall side surface of the end portion located on the radially outer side of the impeller and on the second wall portion side in the axial direction of the impeller. It is good also as a position between a side surface and the 2nd wall part side surface. As a result, the air in the air passage is restrained from flowing back through the space between the bottom surface of the impeller, that is, the second wall portion side surface of the impeller and the inner side surface of the second wall portion, and the air. When the air flowing from the suction port to the outer side in the radial direction of the impeller is sent to the air blowing path, the air flow that has flowed along the cone portion in particular is not obstructed, so the air blowing efficiency of the air blowing unit is reduced. There is nothing.

Furthermore, it is desirable that the protrusion of the air backflow prevention means has a flat surface or a curved surface at the top thereof (Claim 4). As a result, an unintended wind noise may be generated due to the air flow inside the blower unit when the top of the protrusion is acute, and the problem is avoided by having a flat surface or a curved surface at the top of the protrusion. be able to.

On the other hand, the vehicle blower unit according to the present invention is configured such that an inner side surface of a portion of the second wall portion that is located on the opposite side of the impeller with the protrusion as a base point is the first wall portion. It is good also as a structure which provided the expansion part in the said ventilation path by arrange | positioning so that it may leave | separate relatively from an inner surface (Claim 5). Thereby, since the cross-sectional area of a ventilation path becomes large relatively, ventilation resistance of a ventilation path is made small and the ventilation efficiency of a ventilation unit is not reduced.

Furthermore, as a configuration different from the air backflow prevention means according to claim 2, the air backflow prevention means is provided on a radially outer side of the impeller in the second wall portion. A step surface formed by disposing the inner side surface of the portion to be positioned so as to be relatively close to the inner side surface of the first wall portion, and an elevation surface connected to the impeller side of the step surface. A stepped portion configured, and a stepped surface of the stepped portion and an end portion of the impeller located on the outer side in the radial direction of the impeller and on the second wall portion side in the axial direction of the impeller, When viewed from the radial direction side of the impeller, they may be at substantially the same position (Claim 6). Also here, the top of the protrusion may be located at the same position as the first wall side surface of the end of the impeller that is located on the radially outer side of the impeller and on the second wall side in the axial direction of the impeller. The first wall portion of the impeller may be the same position as the second wall side surface of the end portion located on the radially outer side of the impeller and on the second wall portion side in the axial direction of the impeller. The position between the side surface and the second wall portion side surface may be the same as described above. Thereby, it is suppressed that the air in a ventilation path tries to reversely flow through the clearance gap between the bottom face of an impeller and a 2nd wall part. And since the cross-sectional area of a ventilation path becomes comparatively small, the pressure | voltage rise of the air sent to the ventilation path can be carried out efficiently.

The air backflow prevention means includes at least a portion corresponding to the winding start portion of the scroll case portion of the second wall portion and a portion corresponding to the winding end portion of the scroll case portion of the second wall portion. The air backflow prevention means in the portion corresponding to the winding start portion of the scroll case portion of the second wall portion is the radially outer side of the impeller of the second wall portion. A step surface formed by disposing the inner side surface of the portion located at a position relatively close to the inner side surface of the first wall portion, and an elevation surface connected to the impeller side of the step surface. The air backflow prevention means in the portion corresponding to the winding end portion of the scroll case portion of the second wall portion is provided in the air passage. An inner side surface of a portion of the second wall portion that is located on the opposite side of the impeller with respect to the protrusion portion is formed on the inner side of the first wall portion. By arrange | positioning so that it may leave | separate relatively from a side surface, the ventilation volume increase part with a larger cross-sectional area than the site | part which has a level | step-difference part is provided in the said ventilation path, It is characterized by the above-mentioned. Here, the ventilation volume increasing part has a second wall located farther from the first wall part than the step surface of the step part, so that the cross-sectional area is larger than the part having the step part of the air passage. It refers to all the parts of the air passage that are relatively large, and includes not only the extended portion according to claim 5 but also the top portion of the projecting portion according to claims 3 and 4 on the radially outer side of the impeller and the first portion. The part of the ventilation path which has the inclined surface extended in the direction away from a wall part is also contained.

Thereby, since the cross-sectional area of the air passage is relatively small at the winding start portion of the scroll case portion, the air sent to the air passage can be efficiently boosted, and at the winding end portion of the scroll case portion, Since the cross-sectional area of the air passage becomes relatively large, it is possible to reduce the airflow resistance of the air passage and to suppress the reduction of the air blowing efficiency of the air blowing unit.

As described above, according to the invention described in claims 1 to 7, even if there is a gap space having a predetermined reference value between the impeller and the second wall portion such as the motor flange, The air backflow prevention means can eliminate or suppress the flow of air that attempts to backflow from the air passage to the air suction side through the gap space, and the air flows when the air moves into the air passage. Is also prevented from swirling due to the presence of air backflow prevention means. And even if there is an air backflow prevention means, the gap space between the impeller and the second wall portion such as the motor flange is not complicatedly divided, so that it is difficult for moisture to stay in this gap space. Can be prevented from being locked.

In particular, according to the second aspect of the present invention, the protrusion of the air backflow prevention means has an inclined surface on the side opposite to the impeller, so that even if the air backflow prevention means is provided in the air passage, It is possible to prevent the air flow of the air from swirling, and the direction of inclination of the inclined surface of the protrusion is the same as the direction of the air flowing from the air suction port to the outside in the radial direction of the impeller By adjusting the air flow to the impeller, the flow of the air that has flowed outwardly in the radial direction of the impeller to the inside of the ventilation path using the inclined surface of the protrusion as a guide is strengthened, and the impeller is interposed between the protrusion and the radial end of the impeller. It is possible to suppress the flow from flowing into the gap space between the bottom surface of the second wall portion and the upper surface of the second wall portion.

In particular, according to the third aspect of the present invention, the air in the air passage can be prevented from flowing back through the gap space between the bottom surface of the impeller and the second wall portion, and the air suction When air flowing from the mouth to the outside in the radial direction of the impeller is sent to the air passage, the air flow that has flowed along the cone portion in particular is not obstructed, so that the air blowing efficiency of the air blowing unit is reduced. Can also be suppressed.

In particular, according to the invention described in claim 4, when the top of the protrusion of the air backflow prevention means has an acute angle, an unintended wind noise may occur due to the air flow inside the air blowing unit. Since it has the structure which has a flat surface or a curved surface, this malfunction can be avoided.

In particular, according to the invention described in claim 5, since the cross-sectional area of the air passage can be relatively increased, the ventilation resistance of the air passage is reduced, and the problem of reducing the air blowing efficiency of the air blowing unit is suppressed. Can do.

Particularly, according to the invention described in claim 6, it is possible to suppress the air in the air passage from flowing backward through the gap space between the bottom surface of the impeller and the second wall portion. And since the cross-sectional area of a ventilation path can be made relatively small, it becomes possible to raise pressure | voltage efficiently the air sent to the ventilation path.

In particular, according to the invention described in claim 7, since the cross-sectional area of the air passage can be relatively reduced at the winding start portion of the scroll case portion, the air sent to the air passage can be boosted efficiently. In the winding end portion of the scroll case portion, the cross-sectional area of the air passage can be relatively increased, so that the air passage resistance of the air passage is reduced and the reduction in the air blowing efficiency of the air blowing unit is suppressed. Is possible.

Fig.1 (a) is the explanatory view which showed the state which looked at the whole structure of the ventilation unit from the opposite side to the opening of an air suction opening, FIG.1 (b) shows the whole structure of a ventilation unit in an air suction opening. It is explanatory drawing which showed the state seen from the radial direction side. FIG. 2A is a cross-sectional view showing a schematic configuration of the above blower unit cut along the radial direction of the rotary shaft, and FIG. It is sectional drawing which shows the structure of the outline of the state cut | disconnected along the direction. FIG. 3 (a) is for explaining the first embodiment of the present invention, and is an enlarged view of a main part showing a state in which the structure of the protrusion is used, and FIG. It is explanatory drawing which simplified and showed the flow of the air at the time of using the projection part which concerns on Example 1. FIG. FIG. 4A is for explaining the second embodiment of the present invention, and is an enlarged view of a main part showing a state in which the configuration of the protruding portion different from that of the first embodiment is used, and FIG. It is the clear figure which simplified and showed the flow of the air at the time of using the projection part which concerns on this Example 2 as an air backflow prevention means. FIG. 5A is for explaining the third embodiment of the present invention, and is an enlarged view of a main part showing a state in which the configuration of the protruding portion different from the first and second embodiments is used, and FIG. ) Is an explanatory view showing the air flow in a simplified manner when the protrusion according to the third embodiment is used as air backflow prevention means. FIG. 6A illustrates Embodiment 4 of the present invention, which uses a combination of the structure of the protrusion and the structure in which the lower surface on the side farther from the protrusion is lower than the impeller. FIG. 5B is an explanatory diagram showing a simplified flow of air when the protrusion according to the fourth embodiment is used as air backflow prevention means. FIG. 7A is for explaining the fifth embodiment of the present invention, and is an enlarged view of a main part showing a configuration having a stepped portion. FIG. 7B is a diagram showing the fifth embodiment as an air backflow prevention means. It is explanatory drawing which simplified and showed the flow of the air at the time of using the level | step-difference part which concerns. FIG. 8A illustrates an example of a conventional example, and shows a configuration in which a cylindrical rib projecting toward the impeller is formed in a portion that is radially outward from the impeller on the upper surface of the scroll case portion. FIG. 8B is an explanatory diagram showing a problem that air is swirled by having the rib.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 and FIG. 2 show an example of the blower unit 1 in which the present invention is used. The blower unit 1 is used for a vehicle, for example, constituting a part of a vehicle air conditioner, and includes an impeller 2, a motor 3 for driving the impeller 2 to rotate, an air suction port 5 and an air blower. And a case 4 in which an outlet 6 is formed.

The impeller 2 is for generating an air flow by rotating. In this embodiment, the impeller 2 is of a centrifugal multi-blade type. In other words, the impeller 2 faces the motor 3 and faces a cone portion 7 having a substantially triangular pyramid shape, a plurality of wing portions 8 erected along the outer edge of the cone portion 7, and an air suction port 5 described later. A ring-shaped opening edge surface portion 9 connected to the air suction port side end of each wing portion 8 is formed, and a cylindrical boss portion 10 is formed on the top of the cone portion 7.

The motor 3 includes a motor body 11 that houses an electromagnet, a rotor, and the like, and a rotating shaft 12 that transmits a driving force generated in the motor body 11 to the outside as a rotating force. A rotating shaft 12 is inserted into 10 and connected as appropriate to serve as a drive source for rotating the impeller 2.

The case 4 is made of a material such as a resin. In this embodiment, the case 4 accommodates the impeller 2 and most of the motor 3 and has a scroll shape that spreads for a while from the beginning of winding to the end of winding in the radial direction of the impeller 2. The scroll case part 13 which comprises the surrounding wall of the ventilation path 15 of this, and the motor flange 14 to which the motor 3 is fixed are comprised, and also the scroll case part 13 opened the air suction inlet 5 in the wall part 16. The part 13 a and a part 13 b having a wall portion 17 that is located on the opposite side of the air suction port 5 and is connected to the motor flange 14 are combined. A bell mouth 18 is formed on the entire periphery of the air inlet 5 of the part 13a of the scroll case portion 13 as shown in FIG. 2B and FIGS. An air outlet 6 is opened on the most downstream side of the scroll.

As a result, by driving the motor 3 and rotating the impeller 2, the air sucked from the air suction port 5 to the impeller 2 along the axial direction of the rotating shaft 12 rotates from between the blade portions 8 of the impeller 2. After being sent into the air passage 15 along the substantially radial direction of the shaft 12, it is pressurized when passing through the air passage 15 and blown out from the air outlet 6 toward the air passage of another unit.

Next, the air backflow prevention means of the present invention will be individually described as Example 1 to Example 6.

In the first embodiment, as shown in FIG. 3, the case 4 includes an inner surface of the wall portion 17 and an inner surface of the motor flange 14 that are substantially on the same line, and a connection portion between the wall portion 17 and the motor flange 14. Further, the projection 20 is provided as air backflow prevention means for preventing air from flowing back into the gap space 30 between the flange side surface of the impeller 2 and the inner side surface of the motor flange 14.

The protrusion 20 is formed in an annular shape further radially outward than the radially outer end of the impeller 2, and is not positioned in the clearance space 30 between the flange side surface of the impeller 2 and the inner surface of the motor flange 14. It has become a thing. Further, the protruding portion 20 is formed integrally with the wall portion 17 and protrudes from the inner surface of the wall portion 17 into the air passage 15, and the tip portion of the protruding portion 20 is the wall portion at the radially outer end of the cone portion 7. It protrudes to the surface opposite to 17. Furthermore, the projecting portion 20 has an inclined surface 20a that approaches the inner surface of the wall portion 17 along the radial direction of the impeller 2 and proceeds to the opposite side of the impeller 2, and has a sharp cross section at the top. It has a triangular shape. The inclination angle of the inclined surface 20a of the protrusion 20 is set so as to be substantially parallel to the flow direction of the air 50 moving from the impeller 2 into the air passage 15 as shown in FIG. 3B. ing.

The surface 20b located on the impeller 2 side with respect to the inclined surface 20a of the protrusion 20 is substantially perpendicular to the wall portion 17 of the part 13b in this embodiment, but is not necessarily limited thereto. Any configuration suitable for housing the motor 3 in the case 4 and assembling the part 13b and the motor flange 14 may be used.

And the value of the dimension L1 from the surface 20b located on the impeller 2 side of the protrusion 20 to the radially outer end of the impeller 2 is set to 4 mm, for example.

Therefore, by having the protrusion 20 having the above-described form and arrangement, the impeller 2 and the motor due to the vibration in the axial direction of the rotating shaft 12 of the motor 3 with respect to the dimension L2 between the impeller 2 and the motor flange 14. A predetermined reference value (for example, 6 mm) necessary for avoiding risks such as a collision with the flange 14 and a lock of rotation of the impeller 2 due to a foreign object being caught in the gap space 30 between the impeller 2 and the motor flange 14 is taken. In addition, the backflow of air to the space between the impeller 2 and the motor flange 14 is suppressed.

That is, the air 50 that moves (sent out) from the air suction port 5 through the wings 8 of the impeller 2 into the air blowing path 15 in an oblique flow (sent out) is a protrusion 20 that is inclined along the air flow. While being guided by the inclined surface 20a, the air is smoothly sent to the air passage 15. Moreover, the gap space 30 between the impeller 2 and the motor flange 14 is shielded by the protrusion 20 when viewed from the outside in the radial direction of the rotating shaft 12, and the impeller 2 and the motor flange 14 The gap space 31 from the surface 20b located on the impeller 2 side of the protrusion 20 to the radially outer end of the impeller 2 that is continuous with the gap space 30 between the airflow and the air 50 moving from the impeller 2 into the air passage 15 flows. It opens to the upper side so as to intersect the direction. Therefore, even if the dimension L2 of the gap space 30 between the impeller 2 and the motor flange 14 is set to a predetermined reference value (for example, 6 mm), the backflow of air from the air passage 15 into the gap space 30 is suppressed. Can do.

Moreover, since the protrusion 20 has the inclined surface 20a described above, the air 50 that moves from the impeller 2 into the air passage 15 is in the vicinity of the inclined surface 20a as shown in FIG. The flow of the air 105 as shown in FIG. 6 suppresses the problem of swirling around the radial direction of the impeller 101 with respect to the ribs 102 (winding wind is generated).

FIG. 4 shows a second embodiment of the present invention. Embodiment 2 of the present invention will be described below with reference to FIG. However, since the basic configuration of the blower unit 1 is substantially the same as that shown in FIGS. 1 and 2 shown in the first embodiment, in principle, the differences between the second embodiment will be mainly described. Constituent elements common to those in FIG.

Also in the second embodiment, the case 4 has the inner surface of the wall portion 17 and the inner surface of the motor flange 14 substantially in the same line, and the flange portion of the impeller 2 is connected to the motor flange 14 of the wall portion 17. The protrusion 20 is provided as an air backflow prevention means for preventing air from flowing back into the gap space 30 between the side surface and the inner surface of the motor flange 14.

The protrusion 20 is formed integrally with the wall 17 by bending a part of the wall 17 into the air passage 15, and is annularly formed on the outer side in the radial direction further than the radially outer end of the impeller 2. Is formed. Further, the protrusion 20 protrudes from the top end to the surface opposite to the wall 17 at the radially outer end of the cone portion 7. Further, the protrusion 20 has an inclined surface 20a that approaches the inner surface of the wall 17 as it advances to the opposite side of the impeller 2 along the radial direction of the impeller 2, and the apex of the protrusion 20 is substantially reverse. It is V-shaped. And the inclination | tilt angle of the inclined surface 20a of this projection part 20 is set so that it may become substantially parallel to the flow direction of the air 50 which transfers in the ventilation path 15 from the impeller 2, as FIG.4 (b) shows. ing.

In addition, it is the same as that of Example 1 above that the surface 20b located on the impeller 2 side of the projecting portion 20 does not have to be a vertical surface with respect to the wall portion 17 as illustrated. Further, the dimension L1 between the surface 20b of the protrusion 20 located on the impeller 2 side and the radially outer end of the impeller 2 is 4 mm, for example, as in the first embodiment.

Thereby, even if a predetermined reference value (for example, 6 mm) is taken for the dimension L2 of the gap space 30 between the impeller 2 and the motor flange 14 by having the protrusion 20 shown in FIG. In addition, the backflow of air to the gap space 30 between the impeller 2 and the motor flange 14 is suppressed.

FIG. 5 shows a third embodiment of the present invention. A third embodiment of the present invention will be described below with reference to FIG. However, since the basic configuration of the blower unit 1 is substantially the same as that shown in FIGS. 1 and 2 shown in the first embodiment, in principle, the differences between the third embodiment will be mainly described. Constituent elements common to those in FIG.

Also in the third embodiment, as in the first and second embodiments, the inner surface of the wall portion 17 and the inner surface of the motor flange 14 are substantially collinear and connected to the motor flange 14 of the wall portion 17. A projection 20 is provided at the portion as air backflow prevention means for preventing air from flowing back into the gap space 30 between the flange side surface of the impeller 2 and the inner surface of the motor flange 14.

The protruding portion 20 is configured by bending a part of the wall portion 17 into the air passage 15, or is formed in an annular shape on the outer side in the radial direction further than the radially outer end of the impeller 2. This is the same as in the first and second embodiments. Further, the protrusion 20 has an inclined surface 20a that approaches the inner surface of the wall portion 17 along the radial direction of the impeller 2 and proceeds to the opposite side of the impeller 2, and the inclination angle of the inclined surface 20a is As shown in FIG. 5 (b), the point that it is set so as to be substantially parallel to the flow direction of the air 50 moving from the impeller 2 into the air passage 15 is the same as in the first and second embodiments. is there.

On the other hand, in Example 3, the top of the protrusion 20 is not an acute angle and has a flat surface 20c as shown in FIG. Is substantially trapezoidal. And the projection part 20 protrudes so that the flat surface 20c of the projection part 20 may become the same position as the surface on the opposite side to the wall part 17 of the radial direction outer end of the cone part 7, for example. It is to be noted that the surface 20b on the impeller 2 side of the projecting portion 20 does not have to be a vertical surface with respect to the wall portion 17 as shown in the same manner as in the first and second embodiments. Further, the dimension L1 between the surface 20b of the protrusion 20 located on the impeller 2 side and the radially outer end of the impeller 2 is 4 mm, for example, as in the first and second embodiments.

Thereby, even if it takes the predetermined reference value (for example, 6 mm) for the dimension L2 of the gap space 30 between the impeller 2 and the motor flange 14 by having the protrusion 20 shown in FIG. Similarly, the backflow of air to the gap space 30 between the impeller 2 and the motor flange 14 is suppressed. In addition, since the flat surface 20c is provided on the top of the protrusion 20, it is possible to suppress the occurrence of an unintended wind noise noise as compared with the case where the top of the protrusion 20 has an acute angle.

As an explanation of the third embodiment, FIG. 5 has been described on the assumption that the top surface of the protrusion 20 has the flat surface 20c. However, the present invention is not limited to this, but the cross-sectional shape is convex toward the air passage 15 side. It is good also as what has the curved surface curved in the shape.

FIG. 6 shows a fourth embodiment of the present invention. Embodiment 4 of the present invention will be described below with reference to FIG. However, since the basic configuration of the blower unit 1 is substantially the same as that shown in FIGS. 1 and 2 shown in the first embodiment, in principle, the differences between the fourth embodiment will be mainly described. Constituent elements common to those in FIG.

In the fourth embodiment, similarly to the first to third embodiments so far, the gap portion 30 between the flange side surface of the impeller 2 and the inner side surface of the motor flange 14 is formed at the connection portion of the part 13b with the motor flange 14. As the air backflow prevention means for preventing the air from flowing backward, the projection 20 has a cross-sectional shape having a flat surface 20c on the top as in the projection 20 shown in the third embodiment. It has a substantially trapezoidal configuration. That is, the projecting portion 20 of the fourth embodiment includes an inclined surface 20 a set so as to be substantially parallel to the flow direction of the air 50 moving from the impeller 2 into the air passage 15, and the radially outer side of the cone portion 7, for example. It has the flat surface 20c in the same position as the surface on the opposite side to the wall part 17 of an end. Further, the surface 20b located on the impeller 2 side of the protrusion 20 does not have to be vertical as shown in the drawing, as in the first to third embodiments. The dimension L1 from the surface 20b of the protrusion 20 on the impeller 2 side to the radially outer end of the impeller 2 is, for example, 4 mm, as in the first to third embodiments.

On the other hand, in the fourth embodiment, the inner surface of the wall portion 17 of the part 13b is located farther from the air suction port 5 than the inner surface of the motor flange 14, and accordingly, the air suction of the air passage 15 is performed. An extended portion 21 is formed on the side opposite to the mouth 5, and the cross-sectional area of the air passage 15 is relatively large.

Thereby, even if it takes the predetermined reference value (for example, 6 mm) for the dimension L2 of the gap space 30 between the impeller 2 and the motor flange 14 by having the protrusion 20 shown in FIG. Similarly, the backflow of air to the gap space 30 between the impeller 2 and the motor flange 14 is suppressed. In addition, since the top surface of the protrusion 20 has a flat surface 20c, it is possible to suppress the occurrence of unintended wind noise compared to the case where the top of the protrusion 20 has an acute angle, as in the third embodiment. can do.

Further, since the cross-sectional area of the air passage 15 is relatively large due to the presence of the extended portion 21, the airflow resistance of the air passage 15 is lowered, and a suitable air blowing efficiency can be obtained.

In addition, also in this Example 4, although it demonstrated as having the flat surface 20c in the top part of the projection part 20 in FIG. 6, although not limited to this, although a cross-sectional shape is convex toward the ventilation path 15 side, it is not illustrated. Similarly to the third embodiment, it may have a curved surface.

FIG. 7 shows a fifth embodiment of the present invention. Embodiment 5 of the present invention will be described below with reference to FIG. However, since the basic configuration of the blower unit 1 is substantially the same as that shown in FIGS. 1 and 2 shown in the first embodiment, in principle, the differences between the fourth embodiment will be mainly described. Constituent elements common to those in FIG.

In this fifth embodiment, the air backflow prevention means does not have the protruding portion 20 shown in the first to fourth embodiments, but instead the entire wall portion 17 of the part 13b of the scroll case portion 13 is, for example, a cone portion. 7 at the boundary between the part 13b and the motor flange 14 by disposing the motor flange 14 on the air suction port 5 side so as to be in the same position as the surface opposite to the wall 17 at the radially outer end 7. A stepped portion 24 having a stepped surface 22 and an upright surface 23 extending from the edge of the stepped surface 22 on the impeller 2 side to the motor flange 14 side is provided. The cross-sectional area of the air passage 15 is also relatively small. The elevation surface 23 of the step portion 24 extends linearly, for example, along the axial direction of the impeller 2, and the dimension L1 from the elevation surface 23 of the step portion 24 to the radially outer end of the impeller 2 is, for example, It is 4 mm.

As described above, the gap space 31 between the elevation surface of the stepped portion 24 and the radially outer end of the impeller 2, which is connected to the gap space 30 between the impeller 2 and the motor flange 14, extends from the impeller 2 into the air passage 15. The dimension L2 of the gap space 30 between the impeller 2 and the motor flange 14 is set to a predetermined reference value (for example, 6 mm). Even if it takes, it can suppress that an air flows backward from the ventilation path 15 to the said clearance gap space 30. FIG. Moreover, since the cross-sectional area of the air passage 15 is relatively small, the pressure of the air flowing through the air passage 15 can be efficiently increased. Furthermore, since the axial dimension of the rotating shaft 12 of the air passage 15 is relatively small, the air blower unit 1 can be downsized.

In the case 4 of the blower unit 1, the protrusion 20 as the backflow preventing means shown in the first to fourth embodiments described above, the step portion 24 shown in the fifth embodiment, and the blower shown in the fourth embodiment. The present invention is not limited to the case where the extension portions 21 of the path 15 are individually used, and these embodiments can be used in appropriate combination.

That is, at the winding start portion of the scroll case portion 13 of the case 4, as shown in FIG. 7, a step surface 22 in which the entire wall portion 17 is disposed on the air suction port 5 side with respect to the motor flange 14, and this step surface. It is assumed that a stepped portion 24 is provided that includes an end surface 23 connected to the end of the impeller 2 on the 22 side. Then, at the winding end portion of the scroll case portion 13 of the case 4, as shown in FIGS. 3 to 6, a protrusion portion 20 is provided on the wall portion 17, and the diameter relative to the impeller 2 is larger than the protrusion portion 20 of the wall portion 17. By disposing the inner side surface located on the outer side in the direction away from the air suction port 5 rather than the step surface 22 of the step portion 24, an increase in the amount of air flow having a larger cross-sectional area than the portion having the step portion 24 in the air passage 15 Forming part. More specifically, the inner side surface located radially outward with respect to the impeller 2 with respect to the projecting portion 20 of the wall portion 17 is set to substantially the same position as the inner side surface of the motor flange 14 as shown in FIGS. Alternatively, in FIG. 6, it is assumed that the blowing amount increasing portion is formed by having the expanding portion 21 located farther from the air suction port 5 than the motor flange 14.

Thereby, in the site | part corresponding to the winding start part of the scroll case part 13, since the cross-sectional area of the ventilation path 15 becomes relatively small, while being able to pressure | voltage-rise the air sent to the ventilation path 15 efficiently, scrolling In the portion corresponding to the winding end portion of the case portion 13, since the cross-sectional area of the air passage 15 is relatively large because it has the air volume increasing portion such as the expansion portion 21 as described above, the ventilation resistance is reduced, Since the fall of ventilation efficiency can be suppressed, the performance of the ventilation unit 1 can be improved.

Note that the overall structure of the case 4 of the blower unit 1 is not limited to what has been described so far, and has a wall portion 17 that can form the protrusion 20 and the stepped portion 24 on the radially outer side of the impeller 2. It ’s fine.

DESCRIPTION OF SYMBOLS 1 Air blower unit 2 Impeller 3 Motor 4 Case 5 Air inlet 6 Air outlet 7 Cone part 12 Rotating shaft 13 Scroll case part 14 Motor flange 15 Blower path 16 Wall part (1st wall part)
17 Wall (second wall)
20 Protruding portion 20a Inclined surface 20b Surface located on the opposite side to the flange side 20c Flat surface 21 Expanding portion 22 Step surface 23 Elevating surface 24 Step portion

Claims (7)

An air blowing means having an impeller and a motor for rotating the impeller by a rotation shaft;
A case including a scroll case portion including an impeller of the air blowing means and formed with an air passage extending for a while toward the radially outer side of the impeller from the winding start to the winding end of the scroll case portion;
An air suction port for sucking air into the case from the outside is opened in the first wall portion located on one side of the impeller in the axial direction of the case, and at the winding end side portion of the scroll case portion Is a blower unit for a vehicle in which an air outlet for blowing air out of the case is open,
An air backflow prevention means is provided inside the second wall portion located on the other side of the impeller in the axial direction of the case;
The air backflow prevention means is located with a predetermined gap between the impeller radial outer end and the impeller radial outer end, with respect to the impeller radial outer end. The flow of air that moves from the radially outer side into the air passage is adjusted so that the air that moves into the air passage can smoothly flow toward the radially outer side of the impeller. Ventilation unit for vehicles. The air backflow prevention means includes a protrusion protruding into the air passage, and a surface of the protrusion located on the side opposite to the impeller is further away from the rotating shaft as the second wall. 2. The vehicle blower unit according to claim 1, wherein the vehicle blower unit is an inclined surface that is inclined in a direction approaching an inner side surface of the portion other than the projecting portion. The protrusion of the air backflow prevention means has a top on the first wall side, and the second of the top and the impeller in the radial direction of the impeller and the axial direction of the impeller. 3. The vehicle blower unit according to claim 2, wherein the end portion located on the wall side is substantially in the same position when viewed from the radial side of the impeller. 4. The vehicle blower unit according to claim 3, wherein the protrusion of the air backflow prevention means has a flat surface or a curved surface at the top. By disposing the inner side surface of the portion located on the opposite side of the impeller with the protrusion as a base point in the second wall portion so as to be relatively separated from the inner side surface of the first wall portion, The vehicular air blow unit according to claim 2, 3 or 4, wherein an extended portion is provided in the air flow path. The air backflow prevention means is arranged such that an inner side surface of a portion of the second wall portion located on the radially outer side of the impeller is relatively close to the inner side surface of the first wall portion. A stepped portion having a stepped surface formed and an upstanding surface connected to the impeller side of the stepped surface, and the stepped surface of the stepped portion and the outer side of the impeller in the radial direction of the impeller. The end portion located on the second wall portion side in the axial direction of the impeller is substantially at the same position when viewed from the radial direction side of the impeller. Vehicle blower unit. The air backflow prevention means includes at least a portion corresponding to the winding start portion of the scroll case portion of the second wall portion and a portion corresponding to the winding end portion of the scroll case portion of the second wall portion. The structure is different,
The air backflow prevention means in the portion corresponding to the winding start portion of the scroll case portion of the second wall portion has an inner surface of a portion located on the radially outer side of the impeller in the second wall portion. A step surface formed by disposing the first wall portion so as to be relatively close to the inner side surface, and a step portion configured to have an elevation surface connected to the impeller side of the step surface. Consists of
The air backflow prevention means in a portion corresponding to the winding end portion of the scroll case portion of the second wall portion is configured to have a protrusion protruding into the air passage,
By disposing the inner side surface of the portion located on the opposite side of the impeller with the protrusion as a base point in the second wall portion so as to be relatively separated from the inner side surface of the first wall portion, 2. The vehicle blower unit according to claim 1, wherein an air flow rate increasing portion having a larger cross-sectional area than a portion having a step portion is provided in the air flow path.

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