JP2018080614A - Blower unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blower unit with improved blowing efficiency capable of smoothly increasing an air pressure in a blowing path by directly directing air blown between blades of an impeller toward a blowing path expansion part.SOLUTION: A blower 2 housed in a casing 5 having blowing path expansion parts 81a, 82a expanding in an axial direction of a rotation shaft 41 of a motor 4 of the blower 2 on one or both of one side and the other side in the axial direction of the rotation shaft 41 comprises an impeller 3 having plural blades 32, 32. In the blades 32, 32 of the impeller 3, a phase on one side and a phase of the other side in the axial direction of the rotation shaft 41 are displaced from each other by being twisted in a rotation direction or an opposite direction of the impeller 3 corresponding to an expansion direction of the blowing path expansion parts 81a, 82a. Thereby, a flowing direction of air blown between the blades 32, 32 of the impeller 3 is changed, so as to direct the air toward the blowing path expansion parts 81a, 82a directly.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a blower unit that houses an impeller having a plurality of blades of a blower, includes a casing having a blower passage, and the blower passage has a blower passage extending portion extending in the axial direction of a rotation shaft of a motor of the blower.

  As in Patent Document 1 or the like, a scroll chamber of a casing in which the impeller of a centrifugal blower including an impeller having a plurality of blades is accommodated in order to reduce the radial dimension of the rotary shaft of the centrifugal blower or the air conditioner. The space of the air passage of the scroll chamber is temporarily extended from the narrowest portion (tongue portion) toward the discharge port, not only in the radial direction of the rotation shaft of the blower motor but also in the axial direction of the blower motor. Blower units with an increased volume are already known.

  On the other hand, as shown in Patent Document 2 and the like, a centrifugal blower in which a blade extends substantially in parallel with the axial direction of a rotating shaft varies with an increase or decrease in the amount of air blown about the angle of the air blown from between the blades of the impeller to the air blowing path. However, as shown by the broken line arrow W1 in FIGS. 2B and 6B of the present application, it is blown out at an angle of about 10 degrees downward, for example, with respect to the reference line S in the axial direction of the rotating shaft. There is.

JP 2002-202098 A JP 2009-115028 A

  Therefore, when the blower unit shown in Patent Document 1 accommodates a centrifugal blower in which the blade extends substantially in parallel with the axial direction of the rotating shaft, the air blown from between the blades of the impeller is moved into the motor inside the scroll chamber. Toward the outer peripheral wall extending in a spiral shape in the radial direction of the rotating shaft (first step), and then toward the lower or upper bottom surface expanded in the axial direction of the rotating shaft of the motor (second step). The direction of flow is changed to the inside of the radial direction of the motor (third step), and the discharge port is repeated while repeating the four steps of moving substantially toward the impeller along the axial direction of the rotating shaft of the motor (fourth step). It will flow toward.

  For this reason, in the blower unit of Patent Document 1 in which the blade accommodates the centrifugal blower extending substantially in parallel with the axial direction of the rotating shaft, air flows toward the discharge port while being swirled by repeating four steps. It is difficult to raise the air pressure smoothly, and there is a problem that the blower unit cannot sufficiently improve the air blowing efficiency.

  Therefore, the present invention allows the air blown out from between the blades of the impeller to be directed directly to the air passage expansion portion, thereby allowing the air pressure in the air passage to be raised smoothly, thereby improving the air blowing efficiency. The purpose is to provide a blower unit.

  A blower unit according to the present invention includes an impeller having a plurality of blades and a blower including a motor having a rotating shaft that rotates the impeller, and a spiral that expands radially outward of the rotating shaft relative to the impeller in accordance with a winding angle from the tongue. The outer peripheral wall, the air passage formed on the radially inner side of the rotating shaft with respect to the outer peripheral wall, and an air inlet opening on one side in the axial direction of the rotating shaft with respect to the impeller, and accommodates the impeller A casing, and the casing has an air passage extending portion that extends in the axial direction of the rotating shaft in accordance with a winding angle from the tongue on one or both of the axial direction of the rotating shaft. However, when the blade is twisted in the direction of rotation of the impeller or in the opposite direction, there is a shift in the phase on one side and the phase on the other side in the axial direction of the rotation shaft. Feed along the axial direction of the shaft It is characterized by being selected in accordance with the spreading direction of the road extension. When the axial direction is along the vertical direction, one side in the axial direction of the rotating shaft means, for example, the upper side of the impeller, and the other side in the axial direction of the rotating shaft means, for example, the lower side of the impeller. Moreover, an air passage expansion part means either one or both of the below-mentioned one side air passage expansion part and the other side air passage expansion part.

  Thus, by selecting either the impeller rotating direction or the opposite direction with respect to the twisting direction of the impeller blade, the angle of the air blown into the air passage from between the blades is desired in the axial direction of the rotating shaft. Direction. For this reason, the air blown into the air passage from between the blades of the impeller can be directed directly to the air passage expansion portion instead of being directed to the air passage expansion portion after being directed to the outer peripheral wall side of the casing. . Therefore, the air pressure in the air passage can be increased smoothly, and the air blowing efficiency of the blower unit can be improved.

  In the invention according to claim 2, the air passage expansion portion is the other air passage expansion portion that expands toward the other side in the axial direction of the rotation shaft, and the blade extends in the axial direction of the rotation shaft in the rotation direction of the impeller. It is characterized by being twisted so that the phase on one side precedes the phase on the other side.

Thereby, when a casing has the other side ventilation path expansion part which spreads toward the other side of the axial direction of a rotating shaft, the air which blows off to the ventilation path from between the blades of an impeller may be directed to the other side ventilation path expansion part. it can. Therefore, the air pressure in the air passage can be increased smoothly, and the air blowing efficiency of the blower unit can be improved.
In addition, since the air blown from the blades of the impeller to the air passage is directed in the direction away from the air intake port, the flow back from the air passage to the air intake port can be suppressed, and the blower unit blows more reliably. Efficiency can be improved.

  The invention according to claim 3 is characterized in that the casing is provided with a one-side air passage reduction portion for reducing the air passage in the axial direction on one side in the axial direction of the rotating shaft.

  As a result, air blown out from between the blades of the impeller to the air passage directly toward the other air passage expansion portion can be smoothly increased while the air pressure does not contribute to the increase in air pressure. By reducing the one side, the air pressure can be increased more smoothly and the blowing efficiency of the blower unit can be improved. Further, the blower unit can be downsized.

  In the invention according to claim 4, the air passage expansion portion includes the other side air passage expansion portion that expands toward the other side in the axial direction of the rotation shaft, and the one side air flow that expands toward one side in the axial direction of the rotation shaft. And the space on the other side air passage expansion portion is larger than the one side air passage expansion portion, and the blade has a phase on the one side in the axial direction of the rotating shaft in the rotation direction of the impeller. It is characterized by being twisted so as to precede it.

Thereby, even when the casing has not only the other side in the axial direction of the rotating shaft but also the one side air passage expanding portion that expands toward one side, the other side air blowing path that is expanded to the other side in the axial direction of the rotating shaft When the space of the expansion part is larger, the air blown out from between the blades of the impeller to the air passage can be directed to the other air passage expansion part that expands toward the other side in the axial direction of the rotating shaft. Therefore, the air pressure in the air passage can be increased smoothly, and the air blowing efficiency of the blower unit can be improved.
In addition, since the air blown from the blades of the impeller to the air passage is directed away from the air suction port, the flow back from the air passage to the air suction port can be suppressed, and the air blowing efficiency of the blower unit is improved more reliably. Can be made.

  In the invention according to claim 5, the air passage extension portion is a one-side air passage extension portion that expands toward one side in the axial direction of the rotation shaft, and the blade is arranged in the axial direction of the rotation shaft in the rotation direction of the impeller. It is characterized by being twisted so that the phase on the other side precedes the phase on one side.

Thereby, when the casing has a one-side air passage extension that expands toward one side in the axial direction of the rotating shaft, the air blown out from between the blades of the impeller to the air passage may be directed to the one-side air passage extension. it can. Therefore, the air pressure in the air passage can be increased smoothly, and the air blowing efficiency of the blower unit can be improved.
Moreover, since the air blown out from between the blades of the impeller to the one side air passage expansion portion so as to oppose the flow flowing backward from the air passage to the air suction port, the flow flowing back to the air suction port can be suppressed. The blowing efficiency of the blower unit can be improved more reliably.

  The invention according to claim 6 is characterized in that the casing is provided with the other side air passage reduction portion for reducing the air passage in the axial direction on the other side in the axial direction of the rotating shaft.

  As a result, the air blown out from between the blades of the impeller directly to the one-side air passage expansion portion can be directly directed to the one-side air passage expansion portion, while allowing the air pressure to rise smoothly, and the air passage that does not contribute to the increase in air pressure. By reducing the other side, the increase in air pressure can be made smoother and the blower efficiency of the blower unit can be improved. Further, the blower unit can be downsized.

  In the invention according to claim 7, the air passage expansion portion includes the one-side air passage expansion portion that expands toward one side in the axial direction of the rotation shaft and the other-side air blowing that expands toward the other side in the axial direction of the rotation shaft. And the space of the one side air passage expansion portion is larger than that of the other side air passage expansion portion, and the blade has a phase on the other side in the axial direction of the rotating shaft in the rotation direction of the impeller. It is characterized by being twisted so as to precede it.

Thereby, even when the casing has not only one side in the axial direction of the rotating shaft but also the other side air passage expanding portion that expands toward the other side, the one side air passage that is expanded to one side in the axial direction of the rotating shaft When the space of the expansion portion is larger, the air blown out from between the blades of the impeller to the air passage can be directed to the one side air passage expansion portion that expands toward one side in the axial direction of the rotation shaft. Therefore, the air pressure in the air passage can be increased smoothly, and the air blowing efficiency of the blower unit can be improved.
Moreover, since the air blown out from between the blades of the impeller to the one side air passage expansion portion so as to oppose the flow flowing backward from the air passage to the air suction port, the flow flowing back to the air suction port can be suppressed. The blowing efficiency of the blower unit can be improved more reliably.

  As described above, according to the present invention, the angle of the air blown into the air passage from between the blades by selecting either the impeller rotating direction or the opposite direction with respect to the twisting direction of the impeller blade. Can be a desired direction of the axial directions of the rotation shaft. For this reason, the air blown into the air passage from between the blades of the impeller can be directed directly to the air passage expansion portion instead of being directed to the air passage expansion portion after being directed toward the outer peripheral wall side of the casing. . Therefore, the air pressure in the air passage can be increased smoothly, and the air blowing efficiency of the blower unit can be improved.

1A and 1B are explanatory views showing an outline of a blower unit according to Embodiment 1 of the present invention. FIG. 1A is a sectional view of the blower unit as viewed from the side, and FIG. 1B is an upper view of the blower unit. It is sectional drawing seen from. 2A and 2B are explanatory views showing the impeller used in the first embodiment. FIG. 2A is a perspective view of the impeller, and FIG. 2B is a schematic view showing a direction of blowing air from the impeller. FIG. 3 is a schematic view showing the direction of air blowing from the impeller of FIG. 2 into the casing of the blower unit of the first embodiment. 4A and 4B are explanatory views showing an outline of a blower unit according to a second embodiment of the present invention. FIG. 4A is a sectional view of the blower unit viewed from the side, and FIG. 4B is a casing of the blower unit. It is the schematic which showed the air blowing direction from the impeller of FIG. 2 to the inside. FIG. 5: shows the outline of the blower unit of Example 3 of this invention, and is sectional drawing which looked at the said blower unit from the side. 6A and 6B are explanatory views showing an impeller used in the third embodiment. FIG. 6A is a perspective view of the impeller, and FIG. 6B is a schematic view showing a direction of air blowing from the impeller. FIG. 7 is a schematic view showing the air blowing direction from the impeller of FIG. 6 into the casing of the blower unit of the third embodiment. 8A and 8B are explanatory views showing an outline of a blower unit according to Embodiment 4 of the present invention. FIG. 8A is a sectional view of the blower unit as viewed from the side, and FIG. 8B is a blower. It is the schematic which showed the air blowing direction from the impeller of FIG. 6 in the casing of a unit.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. Example 1 is shown in FIGS. 1 to 3, Example 2 is shown using FIG. 4 and FIG. 2 used in Example 1, Example 3 is shown in FIGS. 5 to 7, Example 4 is illustrated using FIG. 8 and FIG. 6 used in Example 3. FIG.

  As shown in FIG. 1, the blower unit 1 according to the first embodiment includes a blower 2 and a casing 5. For example, the blower unit 1 is configured for part of a vehicle air conditioner (not shown). Used for.

  The blower 2 is called, for example, a centrifugal blower. As shown in FIGS. 1 and 2, the impeller 3, a motor 4 having a rotating shaft 41 and a motor main body 42 that rotate the impeller 3, and It has. In this embodiment, the blower 2 is accommodated in the casing 5 so that the impeller 3 is on the upper side of the motor 4.

  As shown in FIGS. 1 and 2, the impeller 3 is attached to a rotating shaft 41 and rotates using the motor 4 as a power source to generate an air flow. The impeller 3 includes a substantially conical cone portion 31 that covers a part of the motor 4 when attached to the rotary shaft 41, and a plurality of blades provided at predetermined intervals on an outer edge portion of the cone portion 31. 32 and a ring-shaped rim 33 that faces an air suction port 53 to be described later and is connected to the air suction port 53 side end of each blade 32. A cylindrical boss 34 is formed on the top of the cone portion 31 to support the rotating shaft 41.

  The blade 32 has a plate-like shape having a substantially arc-shaped concave side surface and a substantially arc-shaped convex side surface, and is arranged so that the concave side surface faces the front in the rotational direction as shown in FIG. ing. The blade 32 of the impeller 3 is twisted in the rotational direction of the impeller 3 or in the opposite direction as shown in FIG. 2A. The details including the relationship will be described later.

  As shown in FIGS. 1 and 2, the casing 5 accommodates the impeller 3. Although not shown, for example, the casing member on one side in the axial direction of the rotary shaft 41 and the other side of the rotary shaft 41 are arranged. It is constructed by assembling a casing member. In the present invention, one side is a side where the impeller 3 sucks air in the axial direction of the rotary shaft 41, and the other side is a side where the cone portion 31 and the blade 32 are connected in the axial direction of the rotary shaft 41. It is.

  The casing 5 includes a tongue 51, a spiral outer peripheral wall 52 that extends outward in the radial direction of the rotation shaft 41 with respect to the impeller 3 according to a winding angle from the tongue 51, and a rotation shaft 41 with respect to the impeller 3. An air suction port 53 that opens to one side in the axial direction, a bell mouth 54 that is formed in the entire peripheral edge of the air suction port 53, and is positioned radially outward from the bell mouth 54 and is located outside the bell mouth 54 and the outer peripheral wall 52. One side wall 55 connecting one side of the motor 4, the motor fixing portion 6 that fixes the motor main body 42 of the motor 4 on the other side, and substantially along the axial direction of the rotary shaft 41 from the entire periphery of the motor fixing portion 6. It has the extending | stretching inner peripheral wall 57 extended on the opposite side to the air suction inlet 53, and the other side wall 56 which connects the outer peripheral wall 52 and the extending | stretching inner peripheral wall 57. FIG. As shown in FIG. 1A, the casing 5 has an outer peripheral wall 52, one side wall 55, the other side wall 56, and an extended inner peripheral wall 57, and starts the winding of the tongue 51 and ends the air discharge port 7. A spiral air passage 8 is formed.

  In the first embodiment, the motor 4 is a well-known motor used in a vehicle air conditioner and is driven by electric power. The outer periphery of the motor main body 42 of the motor 4 is fixed by the motor fixing portion 6 and assembled to the casing 5. The motor fixing portion 6 is a plate-like portion that is annularly disposed at a position close to the impeller 3 (for example, 3 mm to 8 mm) so as to face the entire circumference of the impeller 3. The motor fixing part 6 is disposed at a position close to the impeller 3, thereby restricting the amount of air that flows between the impeller 3 and the motor fixing part 6 unintentionally, and the blowing efficiency of the blower unit 1. Is suppressed.

  In the first embodiment, the air passage 8 is extended in the axial direction of the rotary shaft 41 from the motor fixing portion 6 while the other side of the casing 5 is extended in the axial direction of the rotary shaft 41 to form the extended outer peripheral wall 52a. The extended inner peripheral wall 57 is formed, and the other side wall 56 is displaced in a direction relatively away from the air suction port 53, so that the air passage 8 is expanded to the other side in the axial direction of the rotary shaft 41. It has the ventilation path expansion part 81a. That is, the other-side air passage expansion portion 81 a is formed by being surrounded by the extended outer peripheral wall 52 a, the extended inner peripheral wall 57, and the other side wall 56 of the casing 5, and forms part of the air passage 8. And the site | part which incorporates the other side ventilation path expansion part 81a among the ventilation paths 8 of the casing 5 is outside on the axial direction of the rotating shaft 41 rather than the motor fixing | fixed part 6, as FIG.1 (a) shows. It becomes the protrusion part which protruded.

  By having such an other-side air passage expansion portion 81a, it is possible to increase the space volume of the air passage 8 of the blower unit 1, and thus it is possible to suppress an increase in the size of the blower unit 1 in the radial direction. it can.

  Moreover, in this Example 1, about the ventilation path 8, it has the one side ventilation path reduction part 82b. Specifically, the one side wall 55 is inclined toward the other side wall 56 as it goes from the bell mouth 54 side to the outer peripheral wall 52 side (from the bell mouth 54 side toward the radially outer side of the rotation shaft 41). ing. Thereby, as shown in the broken line of FIG.1 (b), the ventilation path 8 has a small space volume on the one side compared with the case where the one side wall 55 extends along the radial direction of the rotating shaft 41. ing.

  The reason why the air passage 8 can have the one-side air passage reduction portion 82b is based on the fact that one side of the air passage 8 does not contribute to an increase in air pressure, and thus the blower unit 1 can be reduced in size. Can be achieved. However, it is not shown that such a one-side air passage reducing portion 82b is provided, but in the blower unit 1, it is assumed that the one side wall 55 extends along the radial direction of the rotary shaft 41, and the air passage 8 is on one side. It does not deny taking the structure which does not have the ventilation path reduction part 82b.

  The impeller 3 of the blower 2 used in the first embodiment is, for example, a twist type, and the blade 32 is twisted in either the rotation direction of the impeller 3 or the opposite direction. Specifically, as shown in FIG. 2A, the blade 32 is arranged in the axial direction of the rotary shaft 41 so that the phase on one side precedes the phase on the other side in the rotational direction of the impeller 3. It extends while tilting.

  On the other hand, the tongue portion 51 of the casing 5 is usually erected along the axial direction of the rotary shaft 41 in order to facilitate production. For this reason, when the impeller 3 shown in FIG. 2 is used for the casing 5 having a normal structure, the tongue 51 and the blade 32 gradually move from one side of the blade 32 to the other side as the impeller 3 rotates. Therefore, it is possible to reduce the pressure fluctuation of the air between the tongue portion 51 and the blade 32 and reduce the noise of the blower unit 1. However, even if the tongue portion 51 is configured to be inclined with respect to the rotation shaft 41 in the same manner as the blade 32, it is included in the scope of each invention described in this specification.

  And by setting it as the structure of such a braid | blade 32, the flow direction of the air which blows off between the braid | blades 32 and 32 can be changed with respect to the structure where the braid | blade 32 is not twisted. When the impeller 3 has a normal blade that is not twisted as shown in FIG. 2B, the impeller 3 is below the reference line S in the axial direction of the rotating shaft 41 as indicated by the arrow of the broken line W1. Has a property of blowing air from between the blades at an inclination angle of about 10 degrees. On the other hand, the phase of the blade 32 on one side (the side on which the impeller 3 sucks air) in the rotation direction of the impeller 3 is the other side (the side on which the cone portion 31 and the blade 32 are connected in the axial direction of the rotation shaft 41). ), The air can be blown downward at an inclination angle of about 20 degrees to about 30 degrees with respect to the reference line S as indicated by the solid line W2 arrow. is there.

  Therefore, by using the blower 2 provided with the impeller 3 shown in FIG. 2A in the casing 5 shown in FIG. 1A, as shown by the arrow of FIG. When the air sucked into the air is blown out from between the blades 32 and 32 to the air passage 8, the air flow direction is directly directed to the other air passage expansion portion 81 a (the region indicated by the check in FIG. 3). Can do. Therefore, it becomes possible to raise the air pressure of the ventilation path 8 smoothly, and the ventilation efficiency of the blower unit 1 can be improved.

  The blower unit 1 of the second embodiment is similar to or approximates the basic configuration of the blower unit 1 of the first embodiment, but the configurations of the casing 5 and the air passage 8 are different from those of the first embodiment. Therefore, configurations that are the same as or similar to those in the first embodiment are denoted by the same reference numerals as those in the first embodiment and description thereof is omitted or simplified, and the casing 5 and the air passage 8 will be described with reference to FIG.

  The blower path 8 of the blower unit 1 of the second embodiment is surrounded by the extended outer peripheral wall 52a, the extended inner peripheral wall 57, and the other side wall 56 of the casing 5, as shown in FIG. The other side air passage expansion portion 81a is formed by extending the air passage 8 to the other side. And the blower unit 1 has accommodated the air blower 2 provided with the impeller 3 shown by FIG.

  On the other hand, as shown in FIG. 4, the air passage 8 has a one-side air passage expansion portion 82 a on one side instead of the one-side air passage reduction portion 82 b of the first embodiment.

  The one-side air passage expansion portion 82a extends the outer suction wall 53 side of the outer peripheral wall 52 in the axial direction of the rotary shaft 41 to form the extended outer peripheral wall 52b of the casing 5 and also from the bell mouth 54. The inner peripheral wall 58 is formed by extending in the axial direction, and the side wall 55 is displaced in a direction relatively away from the air suction port 53. That is, the one-side air passage expansion portion 82 a is formed as a part of the air passage 8 by being surrounded by the extended outer peripheral wall 52 b, the extended inner peripheral wall 58, and the one side wall 55 of the casing 5. And the site | part which incorporates the one side ventilation path expansion part 82a among the ventilation paths 8 of the casing 5 is outside on the axial direction of the rotating shaft 41 rather than the air suction inlet 53, as FIG. 4 (a) shows. It becomes the protrusion part which protruded. On the other hand, the side wall 55 is located farther from the air suction port 53 than the bell mouth 54. In Example 2, the spatial volume of the one-side air passage expansion portion 82a is smaller than the spatial volume of the other-side air passage expansion portion 81a.

  As described above, the air passage 8 has the one-side air passage expansion portion 82a in addition to the other-side air passage expansion portion 81a, so that the space volume of the air passage 8 of the blower unit 1 can be increased. Therefore, the expansion of the dimension in the radial direction of the blower unit 1 can be further suppressed.

  And since the spatial volume of the other side air passage expansion part 81a is larger than the spatial volume of the one side air passage expansion part 82a, the blower unit 1 of Example 2 is the same as the blower unit 1 of Example 1, as follows. A blower 2 provided with an impeller 3 shown in FIG. Therefore, in the blower unit 1 according to the second embodiment, when the air sucked into the impeller 3 from the air suction port 53 is blown out from between the blades 32 and 32 to the blower path 8 as shown by the arrow in FIG. The air flow direction can be directly directed to the other side air passage expansion portion 81a (the region indicated by the check in FIG. 4B). Therefore, also in the blower unit 1 according to the second embodiment, it is possible to smoothly increase the air pressure of the blower path 8 and improve the blower efficiency of the blower unit 1.

  The blower unit 1 of the third embodiment is similar to or approximates the basic configuration of the blower unit 1 of the first and second embodiments. On the other hand, the blower unit 1 of the third embodiment is different from the first and second embodiments in the configuration of the casing 5 and the air passage 8. Further, the configuration of the impeller 3 of the blower 2 is also different from those of the first and second embodiments. Then, about the structure which is the same as that of Example 1, 2, or approximates, the same code | symbol as Example 1, 2 is attached | subjected, the description is abbreviate | omitted or simplified, and FIG. 5 about the casing 5, the ventilation path 8, and the impeller 3 is shown. Will be described with reference to FIG.

  The blower path 8 of the blower unit 1 of the third embodiment is formed by being surrounded by the extended outer peripheral wall 52b, the extended inner peripheral wall 58, and the one side wall 55 of the casing 5, as in the second embodiment. It has the one side ventilation path expansion part 82a expanded on the one side.

  On the other hand, as shown in FIG. 5, the air passage 8 has, on the other side, the other side air passage reduction portion 81 b instead of the other side air passage expansion portion 81 a of the first and second embodiments. Have.

  In other words, the blower unit 1 according to the third embodiment has the other side air passage reduction portion 81b for the air passage 8. Specifically, the other side wall 56 is inclined toward the one side wall 55 as it goes from the motor fixing portion 6 side to the outer peripheral wall 52 side (from the motor fixing portion 6 side toward the radially outer side of the rotation shaft 41). ing. Thereby, as shown in the broken line of FIG. 5, the air passage 8 has a smaller space volume on the other side than the case where the other side wall 56 extends along the radial direction of the rotation shaft 41.

  The impeller 3 of the blower 2 used in the third embodiment is also referred to as a twist type, for example, and the blade 32 is twisted in either the rotation direction of the impeller 3 or the opposite direction. Specifically, as shown in FIG. 6A, the blade 32 is arranged with respect to the axial direction of the rotary shaft 41 so that the phase on the other side precedes the phase on the one side in the rotational direction of the impeller 3. It extends while tilting.

  On the other hand, the tongue portion 51 of the casing 5 is usually erected along the axial direction of the rotary shaft 41 in order to facilitate production. Therefore, when the impeller 3 shown in FIG. 6 is used for the casing 5 having a normal structure, the tongue 51 and the blade 32 gradually move from the other side of the blade 32 to the one side as the impeller 3 rotates. Therefore, it is possible to reduce the pressure fluctuation of the air between the tongue portion 51 and the blade 32 and reduce the noise of the blower unit 1. However, even if the tongue portion 51 is configured to be inclined with respect to the rotation shaft 41 in the same manner as the blade 32, it is included in the scope of each invention described in this specification.

  Thus, the air passage 8 can have the other side air passage reduction portion 81b because the other side in the axial direction of the rotating shaft 41 of the air passage 8 does not contribute to the increase of the air pressure. Thus, the size of the blower unit 1 can be reduced. Of course, it is not shown in the figure that the other side air passage reducing portion 81b is provided, but the blower unit 1 has the other side wall 56 extending along the radial direction of the rotary shaft 41, and the air passage 8 is located on the other side. It does not deny taking the structure which does not have the ventilation path reduction part 81b.

  And by setting it as the structure of such a braid | blade 32, the flow direction of the air which blows off from the braid | blade 32 can be changed with respect to the structure where the braid | blade 32 is not twisted. When the impeller 3 has a normal blade that is not twisted as shown in FIG. 6B, the impeller 3 is below the reference line S in the axial direction of the rotating shaft 41 as indicated by the arrow of the broken line W1. Has a property of blowing air from between the blades at an inclination angle of about 10 degrees. On the other hand, the phase of the blade 32 on the other side in the rotation direction of the impeller 3 (the side where the cone portion 31 and the blade 32 are connected in the axial direction of the rotation shaft 41) is one side (the side on which the impeller 3 sucks air). ) About 20 degrees upward from the broken line W1 to about 30 degrees (about 10 degrees upward with respect to the reference line S) as indicated by the solid line W3 arrow. It is possible to blow out the air at an inclination angle of about 20 degrees.

  Therefore, by using the blower 2 having the impeller 3 shown in FIG. 6A in the casing 5 shown in FIG. 5, the air is sucked into the impeller 3 from the air inlet 53 as shown by the arrow in FIG. When the air is blown out from between the blades 32 and 32 to the air passage 8, the air flow direction can be directly directed to the one side air passage expansion portion 82 a (the region indicated by the check in FIG. 7). Therefore, it becomes possible to raise the air pressure of the ventilation path 8 smoothly, and the ventilation efficiency of the blower unit 1 can be improved.

  The blower unit 1 of the fourth embodiment is the same as or similar to the blower unit 1 of the first to fourth embodiments with respect to its basic configuration. And the structure of the ventilation path 8 of the blower unit 1 of Example 4 approximates the ventilation path 8 of the blower unit 1 of Example 2. FIG. On the other hand, the impeller 3 of the blower 2 of the fourth embodiment is the same as the impeller 3 of the blower 2 of the third embodiment. Then, about the structure which is the same as that of Example 1 to Example 4 or approximates, the same code | symbol as Example 1 to Example 4 is attached | subjected, the description is abbreviate | omitted or simplified, About the ventilation path 8 and the impeller 3, Description will be made with reference to FIG. 8 focusing on the differences from the second embodiment.

  As shown in FIG. 8A, the blower unit 8 of the blower unit 1 according to the fourth embodiment has one side air passage extension 82a on one side and the other side air passage extension 81a on the other side. In the point, it is the same as that of the blower path 8 of the blower unit 1 of the second embodiment. On the other hand, as shown in FIG. 8A, the air flow path 8 of the blower unit 1 of the fourth embodiment is such that the spatial volume of the one-side air passage expansion portion 82a is the spatial volume of the other-side air passage expansion portion 81a. Is different from the blower path 8 of the blower unit 1 according to the second embodiment.

  Accordingly, unlike the blower unit 1 of the second embodiment, the blower unit 1 of the fourth embodiment uses the blower 2 including the impeller 3 shown in FIG. Therefore, in the blower unit of Example 4, as shown by the arrow in FIG. 8B, when the air sucked into the impeller 3 from the air suction port 53 is blown out from between the blades 32, 32 to the air blowing path 8, The air flow direction can be directly directed to the one-side air passage extension portion 82a (the region indicated by the check in FIG. 8B). Therefore, also in the blower unit 1 according to the fourth embodiment, it is possible to smoothly increase the air pressure in the blower path 8 and improve the blower efficiency of the blower unit 1.

  Up to this point, Example 1, Example 2, Example 3 and Example 4 have been shown and the relationship between the impeller 3 and the air passage expansion portion of the casing 5 has been described, but the contents described in the present specification are not deviated. It goes without saying that forms modified within the scope are included in the scope of each invention described in this specification. For example, with respect to the other side air passage expansion portion 81a, the outer wall 52 and the other side wall 56, and the extended inner wall 57 and the other side wall 56 are shown to intersect each other substantially perpendicularly. You may comprise a cross-sectional curve shape so that it may become concave on the side. Moreover, although the extending | stretching inner peripheral walls 57 and 58 were extended | stretched so that the axial direction of the rotating shaft 41 might be followed, it is radially outer of the rotating shaft 41, so that it isolate | separates with respect to the blade 32 in the axial direction of the rotating shaft 41. You may be comprised so that it may incline.

DESCRIPTION OF SYMBOLS 1 Blower unit 2 Blower 3 Impeller 32 Blade 4 Motor 41 Rotating shaft 5 Casing 51 Tongue part 52 Outer peripheral wall 53 Air inlet 8 Air supply path 81a The other side air supply path expansion part 81b The other side air supply path reduction part 82a One side air supply path expansion part 82b One side air passage reduction section

Claims (7)

A blower (2) comprising an impeller (3) having a plurality of blades (32, 32) and a motor (4) having a rotating shaft (41) for rotating the impeller (3);
A spiral outer peripheral wall (52) extending outward in the radial direction of the rotating shaft (41) with respect to the impeller (3) according to a winding angle from the tongue (51), and the outer peripheral wall (52) An air passage (8) formed radially inward of the rotating shaft (41) and an air suction port (53) that opens to one side in the axial direction of the rotating shaft (41) with respect to the impeller (3). A casing (5) for housing the impeller (3),
The casing (5) is provided on one or the other side in the axial direction of the rotating shaft (41) or on both sides of the rotating shaft (41) according to a winding angle from the tongue (51). It has an air passage expansion part (81a, 82a) that extends in the axial direction,
The blades (32, 32) are twisted in the rotational direction of the impeller (3) or in the opposite direction, thereby shifting between the phase on one side and the phase on the other side in the axial direction of the rotational shaft (41). And the twisting direction of the blades (32, 32) is selected in accordance with the expanding direction of the air passage expansion portions (81a, 82a) along the axial direction of the rotating shaft (41). Blower unit (1) characterized by The air passage extension portion is the other side air passage extension portion (81a) that expands toward the other side in the axial direction of the rotating shaft (41),
The blades (32, 32) are twisted so that the phase on one side in the axial direction of the rotary shaft (41) precedes the phase on the other side in the rotational direction of the impeller (3). Blower unit (1) according to claim 1, characterized in that   The casing (5) includes, on one side in the axial direction of the rotating shaft (41), a one-side air passage reduction portion (82b) that reduces the air passage (8) in the axial direction. The blower unit (1) according to claim 2. The air passage expansion portion extends toward the other side in the axial direction of the rotation shaft (41) and the air passage expansion portion (81a) on the other side that expands toward the other side in the axial direction of the rotation shaft (41). One side air passage expansion portion (82a), the space of the other side air passage expansion portion (81a) is larger than the one side air passage expansion portion (82a),
The blades (32, 32) are twisted so that the phase on one side in the axial direction of the rotary shaft (41) precedes the phase on the other side in the rotational direction of the impeller (3). Blower unit (1) according to claim 1, characterized in that The air passage expansion portion is a one-side air passage expansion portion (82a) that expands toward one side in the axial direction of the rotating shaft (41),
The blades (32, 32) are twisted so that the phase on the other side in the axial direction of the rotary shaft (41) precedes the phase on the one side in the rotational direction of the impeller (3). Blower unit (1) according to claim 1, characterized in that   The casing (5) includes, on the other side in the axial direction of the rotating shaft (41), the other side air passage reducing portion (81b) for reducing the air passage (8) in the axial direction. The blower unit (1) according to claim 5. The air passage expansion portion extends toward one side in the axial direction of the rotating shaft (41) and expands toward the other side in the axial direction of the rotating shaft (41). The other side air passage expansion portion (81a), the space of the one side air passage expansion portion (82a) is larger than the other side air passage expansion portion (81a),
The blades (32, 32) are twisted so that the phase on the other side in the axial direction of the rotary shaft (41) precedes the phase on the one side in the rotational direction of the impeller (3). Blower unit (1) according to claim 1, characterized in that

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