JP2009185750A - Centrifugal multiblade fan - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To restrain reduction in fan efficiency and an increase in noise, and to improve workability for adjusting a plus balance, in a centrifugal multiblade fan for adjusting the plus balance for negating vibration of a fan and a motor being a rotary body. <P>SOLUTION: This centrifugal multiblade fan is stored in a casing 3 of a centrifugal type blower, and blows off air outside in the radial direction by sucking the air from one end side in the axial direction, and has blades 21 arranged in large numbers around a rotary shaft 11, a side plate 22 for connecting one end side end part 211 in the axial direction of the blades 21, and a main plate 23 joined to the rotary shaft 11 and connecting the other end side end part 212 in the axial direction of the blades 21. The side plate 22 has side plate projecting parts 221 and 223 projected from the blades 21, and a balance is adjusted by attaching a counterweight 24 in the side plate projecting parts 221 and 223. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a centrifugal multiblade fan (hereinafter abbreviated as a fan) in which a large number of blades are arranged around a rotation shaft, and is suitable for use in a blower of a vehicle air conditioner.

  The conventional centrifugal blower adds balance weight to the fan (plus balance adjustment) or removes excess weight (minus balance adjustment) to cancel the vibrations of the fan and motor that are rotating bodies. Had gone.

Among these, Patent Literature 1 is disclosed as a centrifugal blower that performs positive balance adjustment. In Patent Document 1, a balance weight is attached to the front edge of the blade.
JP 2006-17057 A

  However, in the prior art of Patent Document 1, since the balance weight is attached to the leading edge of the blade, there is a problem that the wind flow is disturbed, leading to a decrease in fan efficiency and an increase in noise.

  In addition, since the balance weight is attached from the center side of the fan, there is a problem that the work of attaching the balance weight is poor and it is difficult to automate the attachment. This problem is particularly noticeable in small-diameter fans.

  In view of the above points, an object of the present invention is to suppress a decrease in fan efficiency and an increase in noise in a centrifugal multiblade fan that performs positive balance adjustment.

  Another object of the present invention is to improve the workability of positive balance adjustment in a centrifugal multiblade fan that performs positive balance adjustment.

In order to achieve the above object, according to the first aspect of the present invention, the centrifugal fan is housed in the casing (3) of the centrifugal blower and sucks air from one end in the axial direction to blow out the air radially outward. A multi-wing fan,
A plurality of blades (21) disposed around the rotating shaft (11);
A side plate (22) connecting the end (211) in the axial direction of the blade (21);
A main plate (23) coupled to the rotating shaft (11) and connecting the end (212) in the other axial end of the blade (21);
The side plate (22) includes side plate protrusions (221, 223) protruding from the blade (21),
The balance is adjusted by attaching balance weights (24) to the side plate protrusions (221, 223).

  According to this, since balance adjustment can be performed without attaching the balance weight (24) to the blade (21), it is possible to suppress a decrease in blowing efficiency and an increase in noise.

  In addition, since the balance weight (24) is attached to the side plate protrusions (221, 223) protruding from the blade (21) of the side plate (22), the balance weight is attached to the front edge of the blade as compared with the above prior art. Thus, the workability of attaching the balance weight (24) is good, and the attachment is easy to automate.

In invention of Claim 2, in the centrifugal multiblade fan of Claim 1,
The side plate protrusions (221, 223) are characterized in that they form a labyrinth structure with the casing (3).

  Thereby, since it can suppress that the air blown toward the radial direction outer side flows back to the axial direction one end side from the clearance gap between a casing (3) and a side plate (22), the fall of ventilation efficiency and the increase in noise are further increased. Can be suppressed.

In invention of Claim 3, in the centrifugal multiblade fan of Claim 1 or 2,
The balance weight (24) has a clip shape that is fitted to the side plate protrusions (221, 223) so as to sandwich the side plate protrusions (221, 223).

  Thereby, the structure of a side-plate protrusion part (221,223) and a balance weight (24) can be simplified.

  According to a fourth aspect of the present invention, in the centrifugal multiblade fan according to the third aspect, the balance weight (24) protrudes from the side plate so that a part of the balance weight (24) is located between the blades (21). It is characterized by being fitted to the part (221, 223).

  Thus, the blade (21) can prevent the balance weight (24) from being displaced in the fan circumferential direction.

  According to a fifth aspect of the present invention, in the centrifugal multiblade fan of the third or fourth aspect, the balance weight (24) has a claw portion (241) projecting toward the side plate projecting portion (221, 223). Is formed.

  In the invention according to claim 6, in the centrifugal multiblade fan according to claim 5, the side plate (22) is formed with steps (222, 224) with which the claw portion (241) is engaged. It is characterized by.

  As a result, the balance weight (24) can be prevented from falling off.

  According to a seventh aspect of the present invention, in the centrifugal multiblade fan according to the sixth aspect of the present invention, the step (222) is a step of the parting surface.

  According to an eighth aspect of the present invention, in the centrifugal multiblade fan according to any one of the first to seventh aspects, the side plate protruding portion is more than the end portion (211) in the axial direction of the blade (21). It is an annular side plate first protrusion (221) protruding outward in the axial direction.

  According to this, in the centrifugal multiblade fan that suppresses the air blown toward the radially outer side from flowing backward to one axial end by the side plate first protrusion (221), the side plate first protrusion (221). Since the balance weight (24) can be attached using the above, balance adjustment can be easily performed without changing the shape or the like of the existing centrifugal multiblade fan.

According to a ninth aspect of the present invention, in the centrifugal multiblade fan according to any one of the fifth to seventh aspects, the side plate protruding portion is more than the end portion (211) in the axial direction of the blade (21). An annular side plate first protrusion (221) protruding outward in the axial direction;
A nail | claw part (241) is formed in the site | part located in the inner peripheral surface side of the side plate 1st protrusion part (221) among balance weights (24),
The part located in the outer peripheral surface side of the side plate 1st protrusion part (221) among balance weights (24) is closely_contact | adhered to the outer peripheral surface of the side plate 1st protrusion part (221), It is characterized by the above-mentioned.

  According to this, since the gap (Ga) between the casing (3) and the side plate (22) can be reduced, it is possible to suppress a decrease in blowing efficiency and an increase in noise due to a leakage flow from the gap (Ga). Can do.

  According to a tenth aspect of the present invention, in the centrifugal multiblade fan according to any one of the first to seventh aspects, the side plate protrusion is more radial than the outer peripheral side end (213) of the blade (21). It is an annular side plate second projecting portion (223) projecting outward.

  According to this, in the centrifugal multiblade fan that promotes the generation of the swirling flow in the casing (3) by the side plate second protrusion (222), the balance weight (24) is utilized by using the side plate second protrusion (222). Can be easily adjusted without changing the shape or the like of the existing centrifugal multiblade fan.

The invention according to claim 11 is a centrifugal multiblade fan that is housed in a casing (3) of a centrifugal blower, sucks air from one axial end, and blows the air radially outward. ,
A plurality of blades (21) disposed around the rotating shaft (11);
A side plate (22) for connecting the end (211) in the axial direction of the blade (21);
A main plate (23) coupled to the rotary shaft (11) and connecting the end (212) in the other axial end of the blade (21);
The main plate (23) includes main plate protrusions (231, 232) protruding from the blade (21),
The balance is adjusted by attaching balance weights (24) to the main plate protrusions (231, 232).

  According to this, since balance adjustment can be performed without attaching the balance weight (24) to the blade (21), it is possible to suppress a decrease in blowing efficiency and an increase in noise.

  Further, since the balance weight (24) is attached to the main plate protrusions (231, 232) protruding from the blade (21) of the main plate (23), the balance weight is attached to the front edge of the blade as compared with the above-described prior art. Thus, the workability of attaching the balance weight (24) is good, and the attachment is easy to automate.

  According to a twelfth aspect of the present invention, in the centrifugal multiblade fan according to the eleventh aspect, the main plate protrusions (231, 232) form a labyrinth structure with the casing (3).

  Thereby, since it can suppress that air distribute | circulates through the clearance gap between a casing (3) and a main plate (23), the fall of ventilation efficiency and the increase in noise can be suppressed further.

  In the invention according to claim 13, in the centrifugal multiblade fan according to claim 11 or 12, the balance weight (24) sandwiches the main plate protrusions (231, 232) so as to sandwich the main plate protrusion (231, 232) has a clip shape.

  Thereby, the structure of a main board protrusion part (231,232) and a balance weight (24) can be simplified.

  According to the fourteenth aspect of the present invention, in the centrifugal multiblade fan according to the thirteenth aspect, the balance weight (24) protrudes from the main plate so that a part of the balance weight (24) is located between the blades (21). It is characterized by being fitted to the part (231, 232).

  Thus, the blade (21) can prevent the balance weight (24) from being displaced in the fan circumferential direction.

  In the invention described in claim 15, in the centrifugal multiblade fan according to claim 13 or 14, the balance weight (24) has a claw portion (241) protruding toward the main plate protrusion (231, 232). Is formed.

  The invention according to claim 16 is the centrifugal multiblade fan according to claim 15, wherein the main plate (23) is formed with a step (233) with which the claw portion (241) is engaged. And

  As a result, the balance weight (24) can be prevented from falling off.

In the invention described in claim 17, in the centrifugal multiblade fan according to any one of claims 11 to 16,
The main plate protrusion is an annular main plate first protrusion (231) protruding outward in the axial direction from the other end (212) in the axial direction of the blade (21).

  According to this, in the centrifugal multiblade fan that suppresses air from flowing through the gap between the casing (3) and the main plate (23) by the main plate first protrusion (231), the main plate first protrusion 231 is Since the balance weight (24) can be attached by using it, the balance can be easily adjusted without changing the shape or the like of the existing centrifugal multiblade fan.

  The invention according to claim 18 is the centrifugal multiblade fan according to any one of claims 11 to 16, wherein the main plate protrusion is more radial than the outer peripheral end (213) of the blade (21). It is an annular main plate second projecting portion (232) projecting outward.

  According to this, in the centrifugal multiblade fan that promotes the generation of the swirling flow in the casing (3) by the main plate second protrusion (232), the balance weight (24) is utilized using the main plate second protrusion (232). Can be easily adjusted without changing the shape or the like of the existing centrifugal multiblade fan.

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

(First embodiment)
A first embodiment of the present invention will be described. 1 is a cross-sectional view of a centrifugal blower having a centrifugal multiblade fan according to the first embodiment, FIG. 2 is a perspective view of essential parts of the centrifugal multiblade fan of FIG. 1, and FIG. 3 is an enlarged view of a portion A of FIG. 4A is a plan view of the main part of the centrifugal multiblade fan, and FIG. 4B is a cross-sectional view taken along line BB of FIG. 4A.

  The centrifugal blower houses an electric motor 1 having a rotating shaft 11, a resin-made centrifugal multiblade fan (hereinafter abbreviated as a fan) 2 that is rotationally driven by the electric motor 1 and blows out air, and the fan 2. And a scroll scroll made of resin (hereinafter abbreviated as a casing) 3 having a spiral flow path 31 for collecting the air blown from the fan 2.

  The casing 3 is formed with an air suction port 32 that opens toward one end in the fan rotation axis direction (hereinafter, abbreviated as the axial direction). A bell mouth 33 is formed which extends toward the peripheral side and guides the intake air to the intake port 32.

  The fan 2 is provided with a large number of plate-like blades 21 around the rotating shaft 11. The blade 21 has one end 211 in the axial direction, that is, the end on the suction port 32 side, connected by an annular side plate 22. The blade 21 is connected to the other end 212 in the axial direction, that is, the end on the side opposite to the suction port by the main plate 23.

  The main plate 23 is coupled to the rotary shaft 11 at the center thereof, and the driving force of the electric motor 1 is transmitted to the fan 2 via the rotary shaft 11 and the main plate 23. The fan 2 is rotationally driven by the electric motor 1 so that air is sucked into the fan 2 from one end in the axial direction, and the sucked air is outside the fan radial direction (hereinafter referred to as radial direction). It comes to blow out towards.

  The cross-sectional shape of the side plate 22 is such that the cross-sectional area of the air flow path between the blades 21 is along a mainstream streamline that flows between the blades 21 so that the cross-sectional area of the air flow path decreases from the inner side to the outer side in the radial direction. Arc-shaped).

  Further, the side plate 22 includes an annular side plate first protruding portion 221 that protrudes outward in the axial direction from the end portion 211 in the axial direction of the blade 21. More specifically, the side plate first protrusion 221 has a cylindrical shape extending in the axial direction. Then, by arranging the side plate first projecting portion 221 in the bell mouth 33 to form a labyrinth structure, the air blown from the fan 2 is sucked from the gap between the bell mouth 33 of the casing 3 and the side plate 22 of the fan 2. The reverse flow to the 32 side is suppressed.

  In this embodiment, the balance weight 24 is attached to the side plate first projecting portion 221 in order to cancel the vibrations of the fan 2 and the electric motor 1 that are rotating bodies, that is, to perform balance adjustment.

  The balance weight 24 has a clip shape that is fitted to the side plate first protrusion 221 from the suction port 32 side so as to sandwich the side plate first protrusion 221. In addition, the balance weight 24 does not necessarily need to have a clip shape, and various shapes that can be attached to the side plate first protrusion 221 can be adopted.

  The balance weight 24 is formed with a claw portion 241 that engages with a step 222 formed on the inner peripheral surface of the side plate 22. Here, the step 222 of the side plate 22 is a step generated by setting a mold dividing surface (two-dot chain line in FIG. 4B) on the fan 2. In the example of FIG. 4B, a portion of the fan 2 on the right side (radially inner side) of the mold parting surface is molded with a fixed mold, and a part of the fan 2 on the left side (radially outer side) is movable. Molded with a mold.

  In this example, the claw portion 241 of the balance weight 24 is located on the inner peripheral surface side of the side plate 22, but the claw portion 241 of the balance weight 24 is the outer periphery of the side plate 22 as in the modification shown in FIG. 5. It may be located on the surface side.

  Moreover, in this example, although the site | part located in the outer peripheral surface side of the side plate 1st protrusion part 221 is closely_contact | adhered to the side plate 1st protrusion part 221 among the balance weights 24, it is not necessarily closely_contact | adhered to the side plate 1st protrusion part 221. There is no need to be.

  Further, in this example, a part of the balance weight 24 (a part on the claw portion 241 side) is located between the blades 21, but the entire balance weight 24 is between the blades 21 as in the modification shown in FIG. You may not be located in. That is, the entire balance weight 24 may be located on the outer side in the axial direction than the blade 21.

  According to this embodiment, since balance adjustment can be performed without attaching the balance weight 24 to the blade 21 having a function of pushing out air, it is possible to suppress a decrease in blowing efficiency and an increase in noise.

  In addition, since the balance weight 24 is attached to the side plate first protruding portion 221 that protrudes outward in the axial direction from the blade 21, the work of attaching the balance weight 24 as compared with the above-described prior art in which the balance weight is attached to the front edge of the blade. It is easy to automate the installation.

  3, the claw portion 241 of the balance weight 24 is positioned on the inner peripheral surface side of the side plate 22, and the portion of the balance weight 24 that is positioned on the outer peripheral surface side of the side plate first protruding portion 221 is the side plate. Since it is in close contact with the first projecting portion 221, the claw portion 241 of the balance weight 24 is positioned on the outer peripheral surface side of the side plate 22 and the side plate first projecting portion of the balance weight 24 as in the modification of FIG. 5. The gap (gap) Ga between the bell mouth 33 and the side plate 22 of the fan 2 can be reduced as compared with the case where the portion located on the outer peripheral surface side of the portion 221 is separated from the side plate first protrusion 221. It is possible to suppress a decrease in blowing efficiency and an increase in noise due to the leakage flow from the gap Ga.

  Further, when the side plate first projecting portion 221 is provided in order to suppress the air blown out from the fan 2 from flowing backward to the suction port 32 side, the side plate first projecting portion 221 is used to make the fan 2 The balance can be easily adjusted without changing the shape or the like.

  Further, since the claw portion 241 of the balance weight 24 is engaged with the step 222 of the side plate 22, the workability of attaching the balance weight 24 is further improved. For example, since the claw portion 241 of the balance weight 24 is engaged with the step 222 of the side plate 22, when the balance weight 24 is assembled, when the claw portion 241 of the balance weight 24 gets over the step 222, it is called “click”. Since tactile sensation and sound are generated, erroneous work such as insufficient fitting of the balance weight 24 can be prevented.

  Further, since the claw portion 241 of the balance weight 24 is engaged with the step 222 of the side plate 22, it is possible to reliably prevent the balance weight 24 from falling off. More specifically, the balance weight 24 is dropped due to vibration, the balance weight 24 is dropped due to contact with foreign matter mixed in the intake air, and the fan 2 and the electric motor 1 are mistakenly attached to the casing 3 when assembled to the casing 3. It is possible to prevent the balance weight 24 from falling off due to contact.

  In addition, since a part of the balance weight 24 is located between the blades 21, the blade 21 can prevent the claw portion 241 from being displaced in the fan circumferential direction. More specifically, the positional deviation of the balance weight 24 due to vibration, the positional deviation of the balance weight 24 due to contact of foreign matter mixed in the intake air, the acceleration when the fan 2 is started up, and the balance weight 24 due to the deceleration when stopped. Misalignment can be prevented.

(Second Embodiment)
A second embodiment of the present invention will be described. 7 is a cross-sectional view of a centrifugal blower having a centrifugal multiblade fan according to the second embodiment, FIG. 8 is a perspective view of essential parts of the centrifugal multiblade fan of FIG. 7, and FIG. 9 is an enlarged view of a portion C of FIG. It is. In addition, the same code | symbol is attached | subjected to the same or equivalent part as 1st Embodiment, and the description is abbreviate | omitted.

  As shown in FIGS. 7 to 9, the side plate 22 in the fan 2 of the present embodiment includes an annular side plate second protrusion 223 that protrudes radially outward from the outer peripheral side end 213 of the blade 21. More specifically, the side plate second protrusion 223 has a flat bowl shape in the direction perpendicular to the axis (= radial direction). And the production | generation of the turning flow within the casing 3 is accelerated | stimulated by the side plate 2nd protrusion part 223. FIG.

  In the present embodiment, balance adjustment is performed by attaching the balance weight 24 to the side plate second protrusion 223. In this example, the claw portion 241 of the balance weight 24 is located on the inner peripheral surface side of the side plate 22, but the claw portion 241 of the balance weight 24 may be located on the outer peripheral surface side of the side plate 22.

  Further, in this example, the portion of the balance weight 24 located on the outer peripheral surface side of the side plate 22 is in close contact with the side plate 22, but it is not necessarily required to be in close contact with the side plate 22.

  Further, in this example, a part of the balance weight 24 (part on the claw portion 241 side) is located between the blades 21, but even if the entire balance weight 24 is located radially outside of the blade 21. Good.

  In this example, as shown in FIG. 9, the end of the balance weight 24 opposite to the claw 241 is bent in a trumpet shape. More specifically, it is warped toward the side opposite to the side plate 22. As a result, the balance weight 24 is easily assembled to the side plate 22.

  According to the present embodiment, when the side plate second projecting portion 222 is provided in order to promote the generation of the swirling flow in the casing 3, the shape of the fan 2 or the like can be obtained by using the side plate second projecting portion 222. The balance can be easily adjusted without changing the value. In other respects, the same effects as those of the first embodiment can be obtained.

(Third embodiment)
A third embodiment of the present invention will be described. FIG. 10 is a cross-sectional view of a centrifugal blower having a centrifugal multiblade fan according to the third embodiment, and FIG. 11 is a perspective view of a main part of the centrifugal multiblade fan of FIG. In addition, the same code | symbol is attached | subjected to the same or equivalent part as 1st Embodiment, and the description is abbreviate | omitted.

  As shown in FIGS. 10 and 11, the entire side plate 22 of the fan 2 of the present embodiment has a flat bowl shape in the direction perpendicular to the axis (= radial direction). Further, the side plate 22 includes a side plate second protruding portion 223 that protrudes radially outward from the outer peripheral side end portion 213 of the blade 21. And the production | generation of the turning flow within the casing 3 is accelerated | stimulated by the side plate 2nd protrusion part 223. FIG.

  In the present embodiment, balance adjustment is performed by attaching the balance weight 24 to the side plate second protrusion 223. Although illustration is omitted, in this example, the claw portion 241 of the balance weight 24 is located on the opposite side of the bell mouth 33 with respect to the second protrusion 223 on the side plate, but the claw portion 241 of the balance weight 24 is You may be located in the bell mouth 33 side rather than the side plate 2nd protrusion part 223.

  Further, in this example, the portion of the balance weight 24 that is located closer to the bell mouth 33 than the side plate second protrusion 223 is in close contact with the side plate 22, but is not necessarily in close contact with the side plate 22.

  Although not shown, in this example, a part of the balance weight 24 (part on the claw 241 side) is located between the blades 21, but the entire balance weight 24 has a diameter larger than that of the blade 21. You may be located in the direction outside.

  Also in this embodiment, the same effect as the first embodiment can be obtained.

(Fourth embodiment)
A fourth embodiment of the present invention will be described. 12 is a cross-sectional view of a centrifugal blower having a centrifugal multiblade fan according to the fourth embodiment, FIG. 13 is a perspective view of essential parts of the centrifugal multiblade fan of FIG. 12, and FIG. 14 (a) is a perspective view of FIG. FIG. 14B is a cross-sectional view of a main part of a centrifugal multiblade fan according to a modification of the fourth embodiment. In addition, the same code | symbol is attached | subjected to the same or equivalent part as 1st Embodiment, and the description is abbreviate | omitted.

  In each of the above embodiments, the balance weight 24 is attached to the side plate 22 in order to perform balance adjustment. However, in this embodiment, the balance weight 24 is attached to the main plate 23 in order to perform balance adjustment.

  As shown in FIGS. 12 and 13, the main plate 23 of the fan 2 of the present embodiment includes an annular main plate first protrusion 231 that protrudes outward in the axial direction from the other end 212 in the axial direction of the blade 21. ing.

  More specifically, as shown in FIG. 14A, the main plate first projecting portion 231 has a cylindrical shape extending from the radially outer end of the main plate 23 to the axially outer side. In this example, the radially outer end portion of the main plate 23 is disposed at the radially intermediate portion of the blade 21, but the radially outer end portion of the main plate 23 as in the modification shown in FIG. May be arranged at the same position as the radially outer end of the blade 21.

  14C and 14D, the main plate first projecting portion 231 extends outward in the axial direction from a portion of the main plate 23 that is radially inward of the radially outer end. May be.

  Two cylindrical casing protrusions 34 and 35 extending in the axial direction are coaxially provided on the casing 3 on the surface facing the main plate first protrusion 231. An annular groove 36 is formed between the two casing protrusions 34 and 35.

  The main plate first protrusion 231 is arranged in the annular groove 36 to form a labyrinth structure, thereby suppressing air from flowing through the gap between the casing 3 and the main plate 23 of the fan 2. .

  In the present embodiment, balance adjustment is performed by attaching the balance weight 24 to the main plate first protrusion 231 from the outside in the axial direction. In this example, the claw portion 241 of the balance weight 24 is positioned on the inner peripheral surface side of the main plate first protruding portion 231, but the claw portion 241 of the balance weight 24 is positioned on the outer peripheral surface side of the main plate first protruding portion 231. You may make it do.

  Moreover, in this example, although the site | part located in the outer peripheral surface side of the main plate 1st protrusion part 231 among the balance weights 24 is closely_contact | adhering to the main plate 1st protrusion part 231, it is not necessarily closely_contact | adhered to the main plate 1st protrusion part 231. There is no need to be.

  Further, in this example, the entire balance weight 24 is located on the outer side in the axial direction from the end portion 212 on the other end side in the axial direction of the blade 21, and the balance weight 24 is not located between the blades 21. A part of 24 may be located between the blades 21.

  According to the present embodiment, when the main plate first protrusion 231 is provided to promote the generation of the swirling flow in the casing 3, the shape of the fan 2 and the like can be obtained by using the main plate first protrusion 231. The balance can be easily adjusted without changing the value. In other respects, the same effects as those of the first embodiment can be obtained.

(Fifth embodiment)
A fifth embodiment of the present invention will be described. 15 is a cross-sectional view of a centrifugal blower having a centrifugal multiblade fan according to the fifth embodiment, FIG. 16 is a perspective view of the main part of the centrifugal multiblade fan of FIG. 15, and FIG. It is sectional drawing of the principal part in a blade fan. In addition, the same code | symbol is attached | subjected to the same or equivalent part as 4th Embodiment, and the description is abbreviate | omitted.

  As shown in FIGS. 15 to 17, the main plate 23 in the fan 2 of this embodiment includes an annular main plate second protrusion 232 that protrudes radially outward from the outer peripheral side end 213 of the blade 21. More specifically, the main plate second projecting portion 232 has a bowl shape that is flat in the direction perpendicular to the axis (= radial direction). And the production | generation of the swirl | vortex flow in the casing 3 is accelerated | stimulated by the main board 2nd protrusion part 232. FIG.

  In the present embodiment, balance adjustment is performed by attaching the balance weight 24 to the main plate second protrusion 232 from the outer peripheral side. The claw portion 241 of the balance weight 24 is engaged with a step 233 formed in the main plate second protrusion 232.

  In this example, the claw portion 241 of the balance weight 24 is located on the opposite side of the blade 21 with respect to the main plate second protrusion 232, but the claw portion 241 of the balance weight 24 is bladed more than the main plate second protrusion 232. It may be located on the 21 side.

  In this example, the portion of the balance weight 24 that is located on the blade 21 side with respect to the main plate second protrusion 232 is in close contact with the main plate second protrusion 232, but is not necessarily in close contact with the main plate second protrusion 232. You don't have to.

  Further, in this example, the entire balance weight 24 is located radially outside the blade 21 and the balance weight 24 is not located between the blades 21, but a part of the balance weight 24 is between the blades 21. May be located.

  In this example, as shown in FIG. 17, the end of the balance weight 24 opposite to the claw 241 is bent in a trumpet shape. More specifically, it is warped toward the side opposite to the side plate 22. As a result, the balance weight 24 is easily assembled to the side plate 22.

  Also in this embodiment, the same effect as the fourth embodiment can be obtained.

(Sixth embodiment)
A sixth embodiment of the present invention will be described. FIG. 18 is a cross-sectional view of a main part of a centrifugal multiblade fan according to the sixth embodiment. In the second embodiment, the balance weight 24 simply sandwiches the side plate second projecting portion 223, but in this embodiment, the balance weight 24 sandwiches the side plate second projecting portion 223 and the nail of the balance weight 24. The part 241 is engaged with a step 224 formed on the inner peripheral surface of the side plate 22. In addition, the same code | symbol is attached | subjected to the same or equivalent part as 2nd Embodiment, and the description is abbreviate | omitted.

  In this example, the step 224 is formed in the side plate second protrusion 223 of the side plate 22, but the step 224 may be formed in a portion of the side plate 22 located between the blades 21.

  In this example, the end of the balance weight 24 opposite to the claw 241 is bent in a trumpet shape. More specifically, it is warped toward the side opposite to the side plate 22. As a result, the balance weight 24 is easily assembled to the side plate 22.

  Also in this embodiment, the same effect as the second embodiment can be obtained. Further, since the claw portion 241 of the balance weight 24 is engaged with the step 224 of the side plate 22, the balance weight 24 can be reliably prevented from falling off.

(Seventh embodiment)
A seventh embodiment of the present invention will be described. FIG. 19A is a cross-sectional view of a main part of a centrifugal multiblade fan according to the seventh embodiment, and FIGS. 19B to 19D are main parts of a centrifugal multiblade fan according to a modification of the seventh embodiment. 20 (a) is a view in the direction of arrow D in FIG. 19 (a), and FIG. 20 (b) is a view in the direction of arrow D in FIG. 19 (a) according to the modification of the seventh embodiment. It is a visual map.

  In the sixth embodiment, a step 224 is formed in the side plate 22 by protruding a part of the side plate 22, but in this embodiment, a step 224 is formed in the side plate 22 by recessing a part of the side plate 22. ing. In addition, the same code | symbol is attached | subjected to the same or equivalent part as 6th Embodiment, and the description is abbreviate | omitted.

  In the example of FIG. 19A and FIG. 20A, a step 224 is formed by recessing a part of the second side plate second protrusion 223 in a circular shape from the lower surface side toward the upper surface side. As shown in the modification of (b), the step 224 may be formed by recessing a part of the side plate second protrusion 223 into a groove shape. For convenience of illustration, the balance weight 24 is omitted in FIGS. 20 (a) and 20 (b).

  Further, as in the modification shown in FIG. 19B, the step 224 may be formed by recessing from the lower surface side to the upper surface side of the second side plate projecting portion 223, or as shown in FIG. 19C. A step 224 may be formed on both sides of the side plate second protrusion 223 as in the modification, or a hole penetrating the side plate second protrusion 223 is formed as in the modification shown in FIG. A step 224 may be formed.

  Also in this embodiment, the same effect as the sixth embodiment can be obtained.

(Eighth embodiment)
An eighth embodiment of the present invention will be described. FIG. 21A is a perspective view of essential parts of a centrifugal multiblade fan according to the eighth embodiment, and FIG. 21B is a perspective view of essential parts of a centrifugal multiblade fan according to a modification of the eighth embodiment. It is. In the present embodiment, the shape of the side plate 22 is different from that of the first embodiment. In addition, the same code | symbol is attached | subjected to the same or equivalent part as 1st Embodiment, and the description is abbreviate | omitted.

  Although the cross-sectional shape of the side plate 22 of the first embodiment is a substantially arc shape along the mainstream streamline flowing between the blades 21, the cross-sectional shape of the side plate 22 is an axis as shown in FIG. It may be a straight line extending in parallel with the direction. Further, as shown in FIG. 21B, the cross-sectional shape of the side plate 22 may be L-shaped with one end extending parallel to the axial direction and the other end extending parallel to the radial direction.

  Also in this embodiment, the same effect as the first embodiment can be obtained.

(Ninth embodiment)
A ninth embodiment of the present invention will be described. FIG. 22 is a perspective view of an essential part of a centrifugal multiblade fan according to the ninth embodiment. In the present embodiment, the shape of the side plate 22 is different from that of the third embodiment. In addition, the same code | symbol is attached | subjected to the same or equivalent part as 3rd Embodiment, and the description is abbreviate | omitted.

  The side plate 22 of the third embodiment as a whole has a bowl shape that is flat in the direction perpendicular to the axis (= radial direction). However, as shown in FIG. 22, the side plate 22 is arranged in the direction perpendicular to the axis (= radial direction). A flat bowl-shaped portion and a cylindrical portion extending in the axial direction along the outer peripheral side end portion 213 of the blade 21 may be provided.

  Also in this embodiment, the same effect as the said 3rd Embodiment can be acquired.

It is sectional drawing of the centrifugal air blower which has the centrifugal multiblade fan by 1st Embodiment of this invention. It is a perspective view of the principal part in the centrifugal multiblade fan of FIG. It is the A section enlarged view of FIG. (A) is a top view of the principal part in a centrifugal multiblade fan, (b) is BB sectional drawing of (a). It is sectional drawing of the principal part of the centrifugal air blower by the 1st modification of 1st Embodiment. It is sectional drawing of the principal part of the centrifugal air blower by the 2nd modification of 1st Embodiment. It is sectional drawing of the centrifugal air blower which has the centrifugal multiblade fan by 2nd Embodiment of this invention. It is a perspective view of the principal part in the centrifugal multiblade fan of FIG. It is the A section enlarged view of FIG. It is sectional drawing of the centrifugal air blower which has the centrifugal multiblade fan by 3rd Embodiment of this invention. It is a perspective view of the principal part in the centrifugal multiblade fan of FIG. It is sectional drawing of the centrifugal air blower which has the centrifugal multiblade fan by 4th Embodiment of this invention. It is a perspective view of the principal part in the centrifugal multiblade fan of FIG. (A) is sectional drawing of the principal part in the centrifugal multiblade fan of FIG. 13, (b)-(d) is sectional drawing of the principal part in the centrifugal multiblade fan by the modification of 4th Embodiment. . It is sectional drawing of the centrifugal air blower which has the centrifugal multiblade fan by 5th Embodiment of this invention. It is a perspective view of the principal part in the centrifugal multiblade fan of FIG. It is sectional drawing of the principal part in the centrifugal multiblade fan of FIG. It is sectional drawing of the principal part of the centrifugal multiblade fan by 6th Embodiment of this invention. (A) is sectional drawing of the principal part of the centrifugal multiblade fan by 7th Embodiment of this invention, (b)-(d) is the principal part in the centrifugal multiblade fan by the modification of 7th Embodiment. FIG. (A) is a D direction arrow view of FIG. 19 (a), (b) is a D direction arrow view of FIG. 19 (a) by the modification of 7th Embodiment. (A) is a perspective view of the principal part of the centrifugal multiblade fan by 8th Embodiment of this invention, (b) is a perspective view of the principal part of the centrifugal multiblade fan by the modification of 8th Embodiment. is there. It is a perspective view of the principal part of the centrifugal multiblade fan by 9th Embodiment of this invention.

Explanation of symbols

11 Rotating shaft 21 Blade 22 Side plate 23 Main plate 24 Balance weight

Claims (18)

A centrifugal multiblade fan housed in a casing (3) of a centrifugal blower, which sucks air from one axial end side and blows air radially outward,
A plurality of blades (21) disposed around the rotating shaft (11);
A side plate (22) for connecting one end (211) in the axial direction of the blade (21);
A main plate (23) coupled to the rotating shaft (11) and connecting the axially other end (212) of the blade (21);
The side plate (22) includes side plate protrusions (221, 223) protruding from the blade (21),
The centrifugal multiblade fan is characterized in that the balance is adjusted by attaching a balance weight (24) to the side plate protrusions (221, 223).   The centrifugal multiblade fan according to claim 1, wherein the side plate protrusions (221, 223) form a labyrinth structure with the casing (3).   The balance weight (24) has a clip shape fitted to the side plate protrusions (221, 223) so as to sandwich the side plate protrusions (221, 223). The centrifugal multiblade fan according to 2.   The balance weight (24) is fitted to the side plate protrusion (221, 223) so that a part of the balance weight (24) is located between the blades (21). 3. The centrifugal multiblade fan according to 3.   The centrifugal multiblade according to claim 3 or 4, wherein the balance weight (24) is formed with a claw portion (241) projecting toward the side plate projecting portion (221, 223). fan.   The centrifugal multiblade fan according to claim 5, wherein the side plate (22) is formed with steps (222, 224) with which the claw portions (241) are engaged.   The centrifugal multiblade fan according to claim 6, wherein the step (222) is a step of a parting surface.   The said side-plate protrusion part is a cyclic | annular side-plate 1st protrusion part (221) which protrudes to an axial direction outer side rather than the axial direction one end side end part (211) of the said blade (21), The 1 thru | or 1 characterized by the above-mentioned. The centrifugal multiblade fan according to any one of 7 above. The side plate protrusion is an annular side plate first protrusion (221) protruding outward in the axial direction from the end (211) in the axial direction of the blade (21).
The claw portion (241) is formed in a portion of the balance weight (24) located on the inner peripheral surface side of the side plate first protrusion (221),
The part located in the outer peripheral surface side of the said side plate 1st protrusion part (221) among the said balance weight (24) is closely_contact | adhered to the outer peripheral surface of the said side plate 1st protrusion part (221). Item 8. The centrifugal multiblade fan according to any one of Items 5 to 7.   The said side-plate protrusion part is a cyclic | annular side-plate 2nd protrusion part (223) which protrudes to a radial direction outer side from the outer peripheral side edge part (213) of the said blade (21), The 1st thru | or 7 characterized by the above-mentioned. The centrifugal multiblade fan according to any one of the above. A centrifugal multiblade fan housed in a casing (3) of a centrifugal blower, which sucks air from one axial end side and blows air radially outward,
A plurality of blades (21) disposed around the rotating shaft (11);
A side plate (22) for connecting one end (211) in the axial direction of the blade (21);
A main plate (23) coupled to the rotating shaft (11) and connecting the axially other end (212) of the blade (21);
The main plate (23) includes main plate protrusions (231, 232) protruding from the blade (21),
The centrifugal multiblade fan is characterized in that a balance weight (24) is attached to the main plate protrusions (231, 232) for balance adjustment.   The centrifugal multiblade fan according to claim 11, wherein the main plate protrusion (231, 232) forms a labyrinth structure with the casing (3).   The said balance weight (24) has a clip shape fitted to the said main plate protrusion part (231,232) so that the said main plate protrusion part (231,232) may be pinched | interposed, or 12. The centrifugal multiblade fan according to 12.   The balance weight (24) is fitted into the main plate protrusion (231, 232) so that a part of the balance weight (24) is located between the blades (21). 13. The centrifugal multiblade fan according to 13.   The centrifugal multiblade according to claim 13 or 14, wherein the balance weight (24) is formed with a claw portion (241) protruding toward the main plate protruding portion (231, 232). fan.   The centrifugal multiblade fan according to claim 15, wherein a step (233) with which the claw portion (241) is engaged is formed in the main plate (23).   The main plate protrusion is an annular main plate first protrusion (231) protruding outward in the axial direction from the other end (212) in the axial direction of the blade (21). The centrifugal multiblade fan as described in any one of thru | or 16.   17. The main plate protruding portion is an annular main plate second protruding portion (232) protruding outward in the radial direction from the outer peripheral side end portion (213) of the blade (21). The centrifugal multiblade fan according to any one of the above.

Images