JP5747888B2 - Blower - Google Patents

Description

  The present invention relates to a blower having blades provided with a plurality of notches.

  A blower such as a crossflow fan or a sirocco fan used in an indoor unit of an air conditioner has a plurality of blades arranged in the circumferential direction. Both ends of each blade in the rotation axis direction are supported by an annular or disk-shaped support member. In this blower, aerodynamic noise (wind noise) generated by the air flow passing through the blower often becomes a problem. To solve this problem, a blower designed to reduce aerodynamic noise (wind noise) by providing a plurality of notches on the outer wing tip of the blade to reduce the wake vortex generated on the blowout side of the blower. Has been proposed (see, for example, Patent Document 1).

JP 2006-125390 A

  However, when blades with multiple notches are used, external force is applied to the blades, such as when an object collides with the outer peripheral surface of the blower during product assembly, operation, or repair / maintenance. And stress concentrates on the notch part located in the vicinity of a supporting member. Also, stress concentration occurs in the notch located near the support member due to the centrifugal force acting on the blades. For this reason, there is a risk that the blade may be cracked starting from the notch in the vicinity of the support member, and the blade may be damaged.

  Then, the objective of this invention is providing the air blower which can prevent the failure | damage of a blade | wing.

A blower according to a first aspect of the present invention includes a plurality of blades arranged in a circumferential direction and a support member that supports the plurality of blades, and a plurality of notches are provided at the outer wing ends of the blades. The plurality of cutout portions are formed in a direction, and the two or more first cutout portions are substantially the same in size as the first cutout portions, and the thickness thereof is the first cutout portion. And at least one second notch that is thicker than the notch, and the second notch is disposed adjacent to the support member .

In this blower, the thickness of a part of the plurality of notches (second notch) is made thicker than the thickness of the other notches (first notch), and the blade Therefore, even if stress concentration occurs in the second notch when an external force is applied to the blade, the blade can be prevented from being damaged.
Further, when the strength of the blade is increased by reducing the size of the second notch portion, the effect of reducing the noise is reduced. However, in the present invention, the size of the second notch portion is the first notch portion. Since it is substantially the same as the size of the notch, the blades can be prevented from being damaged without reducing the noise reduction effect.

Further, in this blower, when an external force is applied to the blade, stress concentrates on the notch in the vicinity of the support member. Therefore, by arranging the thick second notch adjacent to the support member, the blade Can be reliably prevented.

In the blower according to a second invention, in the first invention, the thickness of the first notch is thinner than the thickness of the portion without the notch provided on both axial sides of the first notch. The thickness of the second notch is substantially the same as that of the portion having no notch provided on both sides in the axial direction of the second notch.

  In this blower, since the thickness of the second notch is substantially the same as the thickness of the non-notch adjacent to the second notch, the second notch is easily formed. In addition, since the thickness of the first notch is thinner than the thickness of the non-notch adjacent to the first notch, the air flow flowing toward the outer peripheral wing tip of the blade is Energy loss due to collision can be reduced.

In the blower according to a third aspect , in the first aspect , the thickness of the first notch is substantially the same as the thickness of the portion having no notch provided on both axial sides of the first notch. Further, the thickness of the second notch is thicker than the thickness of the portion having no notch provided on both sides in the axial direction of the second notch.

  In this blower, since the thickness of the second notch is thicker than the thickness of the non-notch adjacent to the second notch, the strength of the second notch can be increased.

In the second and third aspects of the invention, the thickness of the notch is substantially the same as the notched portion provided on both sides in the axial direction of the notch. If the thickness of the part without the notch is not constant, the thickness of the notch is the thickness of the part without the notch provided on both sides of the notch in the axial direction. It is said that the thickness of the notch is the same as the thickness of the middle, and when the thickness of the blade is substantially constant as a whole and the thickness of the portion without the notch is constant, the thickness of the notch It is the same as the thickness of the part without a notch provided on both sides in the axial direction.

In the blower according to a fourth aspect of the present invention, in any one of the first to third aspects, the thickness of a portion of the outer peripheral wing end of the blade where the notch is not formed approaches the support member. It is characterized by being thick.

  In this blower, when an external force is applied to the blades, the load becomes larger as the position is closer to the support member. Therefore, the thickness of the portion where the notched portion is not formed on the outer peripheral blade end of the blade is closer to the support member. By being thick, it is possible to prevent the blades from being damaged more reliably.

A blower according to a fifth invention is characterized in that, in any one of the first to fourth inventions, the support member is an annular or disk-like plate that supports an axial end of the blade. To do.

  In this blower, since the second notch is disposed in the vicinity of the plate, the blades can be prevented from being damaged in the vicinity of the plate.

A blower according to a sixth invention is characterized in that, in any one of the first to fifth inventions, the support member is an auxiliary ring that supports an intermediate portion in the axial direction of the blade.

  In this blower, since the second notch is disposed in the vicinity of the auxiliary ring, it is possible to prevent the blades from being damaged in the vicinity of the auxiliary ring.

  As described above, according to the present invention, the following effects can be obtained.

In 1st invention, the thickness of some notch parts (2nd notch part) among several notch parts is made thicker than the thickness of another notch part (1st notch part). Since the strength of the blade is increased, it is possible to prevent the blade from being damaged even if stress concentration occurs in the second notch when an external force is applied to the blade.
Further, when the strength of the blade is increased by reducing the size of the second notch portion, the effect of reducing the noise is reduced. However, in the present invention, the size of the second notch portion is the first notch portion. Since it is substantially the same as the size of the notch, the blades can be prevented from being damaged without reducing the noise reduction effect.

In addition, when an external force is applied to the blade, stress concentrates on the notch in the vicinity of the support member. By arranging the thick second notch adjacent to the support member, the blade can be reliably damaged. Can be prevented.

In the second invention, since the thickness of the second notch is substantially the same as the thickness of the non-notch adjacent to the second notch, the second notch can be easily formed. In addition, since the thickness of the first notch is thinner than the thickness of the non-notch adjacent to the first notch, the air flow flowing toward the outer peripheral wing tip of the blade is Energy loss due to collision can be reduced.

In 3rd invention, since the thickness of a 2nd notch part is thicker than the thickness of the non-notch part adjacent to this 2nd notch part, the intensity | strength of a 2nd notch part can be made higher.

In the fourth invention, when an external force is applied to the blade, the load becomes larger as the position is closer to the support member. Therefore, the thickness of the portion of the blade on the outer peripheral side where the notch is not formed is By being thicker as it gets closer, breakage of the blade can be prevented more reliably.

In the fifth invention, since the second notch is disposed in the vicinity of the plate, the blade can be prevented from being damaged in the vicinity of the plate.

In the sixth aspect , since the second notch is disposed in the vicinity of the auxiliary ring, it is possible to prevent the blades from being damaged in the vicinity of the auxiliary ring.

It is sectional drawing of the air conditioner to which the air blower which concerns on embodiment of this invention was applied. It is a front view of the air blower concerning the embodiment of the present invention. It is a perspective view of an impeller. It is a perspective view of an impeller. It is sectional drawing along the AA line of FIG. (A) is the partial expanded front view of a blade | wing, (b) is a cut end view along the BB line of (a). (A) is sectional drawing along CC line of Fig.6 (a), (b) is sectional drawing along DD line of Fig.6 (a), (c) is It is sectional drawing along the EE line of Fig.6 (a). (A) is the partial expanded front view of the blade | wing of the air blower which concerns on other embodiment of this invention, (b) is a cut end view along the FF line of (a). It is a front view of the blade | wing used for the air blower which concerns on other embodiment of this invention. It is a front view of the blade | wing used for the air blower which concerns on other embodiment of this invention. (A) is the elements on larger scale of the blade | wing used for the air blower which concerns on other embodiment of this invention, (b) is a cutting | disconnection end elevation along the GG line of (a).

Embodiments of the present invention will be described below.
The blower 4 of this embodiment is applied to the indoor unit 1 of an air conditioner. The indoor unit 1 constitutes an air conditioner together with an outdoor unit (not shown), and performs indoor air conditioning. As shown in FIG. 1, the indoor unit 1 of the present embodiment includes a casing 2 and internal devices such as a heat exchanger 3, a blower 4, a filter 5, and an electrical component box (not shown) housed in the casing 2. I have. The indoor unit 1 has an elongated shape in one direction as a whole, and is installed on a wall surface in the room so that its longitudinal direction is horizontal.

  A suction port 2 a is formed on the upper surface of the casing 2, and an air outlet 2 b is formed on the lower surface of the casing 2. In the vicinity of the air outlet 2b, a horizontal flap 6 for adjusting the wind direction in the vertical direction and opening and closing the air outlet 2b is disposed. The blower 4 is composed of a cross flow fan, and is arranged such that its axial direction is along the horizontal direction. The blower 4 is configured to suck air from the upper front and blow it out to the lower rear. The heat exchanger 3 is arrange | positioned so that the front and upper direction of the air blower 4 may be surrounded. During the air conditioning operation, the air blower 4 drives the room air to be sucked in from the suction port 2a, and the sucked air is heated or cooled in the heat exchanger 3 and then blown out from the air outlet 2b. Yes.

  As shown in FIG. 2, the blower 4 includes a plurality of plates (10, 11, 12) arranged at intervals in the axial direction and a plurality of blades spanned between two adjacent plates. 20 and an auxiliary ring 30 provided in the middle of the blade 20 in the axial direction. The blower 4 is formed by connecting end plates 10, a plurality of impellers 41, and an impeller 42 side by side in the axial direction. In the following description, the left-right direction shown in FIG. 2 is simply referred to as “left-right direction”.

  As shown in FIG. 3, the impeller 41 includes a plurality of blades 20 arranged in the circumferential direction, an annular support plate 11 that supports axial ends (left end portions) of the plurality of blades 20, and a plurality of blades 20. It is comprised with the substantially annular auxiliary ring 30 which supports the axial direction intermediate part of the blade | wing 20. The plurality of blades 20, the support plate, and the auxiliary ring 30 are integrally formed by injection molding.

  As shown in FIG. 4, a plurality of fitting grooves 11 a are formed side by side in the circumferential direction on the left surface of the support plate 11 (the surface opposite to the surface on which the blades 20 are integrated). In the fitting groove 11a, right end portions 20a (hereinafter referred to as fitting end portions 20a) of a plurality of blades 20 of the adjacent impeller 41 (or impeller 42) are fitted and supported.

  As shown in FIG. 5, the auxiliary ring 30 has an inner periphery connected to the surfaces of the plurality of blades 20. The auxiliary ring 30 is provided slightly to the right of the central portion of the blade 20 in the left-right direction. Details of the blade 20 will be described later.

  The impeller 42 includes a disc-shaped end plate 12 instead of the support plate 11, and the other configuration is the same as the impeller 41. A shaft 12a projects from the center of the left side surface of the end plate 12 (the surface opposite to the surface on which the blades 20 are integrated). The shaft 12a is rotatably supported by a bearing (not shown) provided in the casing 2.

  The end plate 10 is a disk-shaped member, and a fitting groove (not shown) similar to the fitting groove 11a of the support plate 11 is formed on the left side surface thereof. A boss portion 10 a that is connected to a rotation shaft of a motor (not shown) that drives the blower 4 protrudes from the center portion of the right side surface of the end plate 10.

  Next, details of the blade 20 will be described. Here, although the blade 20 of the impeller 41 will be described, the blade 20 of the impeller 42 has the same configuration. As shown in FIG. 3, the plurality of blades 20 extend along the axial direction (left-right direction), and are disposed in a forward blade structure with a predetermined blade angle. The blade 20 has a substantially arc shape in cross section perpendicular to the axial direction, and a surface 20b that swells outward is a negative pressure surface (a surface in which pressure decreases when rotating from a stationary state).

  A plurality of notches 21 are formed at equal intervals on the outer wing tip of the blade 20. The notch 21 is formed in a V shape. The sizes (width and depth) of the plurality of notches 21 are all the same. By providing the notch 21 at the outer wing tip of the blade 20, the wake vortex generated on the blowout side of the blower 4 is reduced, and aerodynamic noise (wind noise) can be reduced.

  As shown in FIG. 6A, among the plurality of cutout portions 21 of one blade 20, the cutout portion 21 closest to the fitting end portion (right end portion) 20a is formed as a cutout portion (second Notch portion) 21B. The notch 21B is adjacent to the left surface of the support plate 11 of the adjacent impeller 41. The notch 21 adjacent to the right side surface of the auxiliary ring 30 is referred to as a notch (second notch) 21C. Moreover, let the notch parts 21 other than the notch parts 21B and 21C be the notch part (1st notch part) 21A.

  Moreover, as shown to Fig.6 (a), in one blade | wing 20, the axial direction range in which the notch parts 21A, 21B, and 21C are formed is set as the notch area | region 22A, 22B, 22C, respectively. The cutout regions 22A, 22B, and 22C are collectively referred to as a cutout region 22. An axial range where the notch 21 is not formed is defined as a non-notch region 23. The notched regions 22 and the non-notched regions 23 are alternately arranged in the axial direction (left-right direction).

  As shown in FIGS. 6 (a) and 7 (a), among the plurality of non-cutout regions 23, in the vicinity of the outer wing tip of the suction surface 20b of the non-cutout region 23 to which the auxiliary ring 30 is not connected. A plurality of concave spherical recesses 24 are formed. By providing the depression 24 in the negative pressure surface 20b of the blade 20, it is possible to suppress the air flow flowing toward the blade 20 from being separated from the blade 20, and as a result, the pressure resistance acting on the blade 20 is reduced, so that the driving energy is reduced. Can be reduced.

  As shown in FIG. 6B, in one blade 20, the thickness of the plurality of non-notched regions 23 becomes thinner toward the fitting end 20 a. Moreover, the thickness of the substantially half of the inner peripheral side of the blade 20 is also thinner as it approaches the fitting end 20a. That is, as a whole, the blade 20 is thinner as it approaches the fitting end portion 20a. In addition, the thickness of the non-notch area | region 23 points out the thickness of the location which does not have the hollow 24 of the non-notch area | region 23, and it is set as the same definition also in the following description.

  As shown in FIG. 7B, the outer half of the notched region 22A is approximately half as thick as the outer half of the adjacent non-notched region 23. As shown in FIGS. 6A and 6B, the thickness of approximately half of the outer periphery side of the cutout region 22A gradually decreases toward the deepest position of the cutout portion 21A. Therefore, the thickness of the cutout portion 21A is thinner than the thickness of the non-cutout region 23. By reducing the thickness of the notch 21A, the area of the end face of the notch 21A is reduced, so that the air flow (see the arrow in FIG. 7B) flowing toward the outer wing tip of the blade 20 is cut. Energy loss due to collision with the notch 21A can be reduced.

  As shown in FIG. 7C, the thickness of the notched region 22B is substantially the same as the thickness of the adjacent non-notched region 23. The thickness of the notch region 22B is substantially the same as the thickness of the two non-notch regions 23 on both sides in the axial direction of the notch region 22B (specifically, the thickness between the two). It gets thinner as you get closer. Further, the thickness of the notch region 22C is substantially the same as the thickness of the two non-notch regions 23 on both sides in the axial direction of the notch region 22C (specifically, the thickness between the two). However, it is thinner as it approaches the fitting end 20a. Therefore, the thickness of the notches 21B and 21C is greater than the thickness of the notch 21A.

  When an external force is applied to the blade 20 during the assembly or operation of the indoor unit 1, the notch 21 adjacent to the support plate 11 or the end plates 10 and 12 and the notch 21 adjacent to the auxiliary ring 30 are applied. Stress is concentrated. In the blower 4 of the present embodiment, the thickness of the notch 21B adjacent to the plates 10 and 11 and the thickness of the notch 21C adjacent to the auxiliary ring 30 are made thicker than the thickness of the notch 21A. Since the strength is increased, the blades 20 can be prevented from being damaged near the plates 10 and 11 and the auxiliary ring 30.

  Further, when the strength of the blade 20 is increased by reducing the size of the notch portion 21, the effect of reducing aerodynamic noise is reduced, but in the present embodiment, the size of the notch portions 21B and 21C is Since it is the same as the size of the notch 21A, the blade 20 can be prevented from being damaged without reducing the noise reduction effect.

  Moreover, in this embodiment, since the thickness of the notch parts 21B and 21C is respectively substantially the same as the thickness of the adjacent non-notch area | region 23, it is easy to form the notch parts 21B and 21C. Moreover, since the thickness of the notch 21A is thinner than the thickness of the adjacent non-notch region 23, the energy caused by the collision of the air flow flowing toward the outer wing tip of the blade 20 with the notch 21A. Loss can be reduced.

  Further, in the present embodiment, the thickness of the notch 21B adjacent to the left surface of the plates 10 and 11 and the notch 21C adjacent to the right surface of the auxiliary ring 30 are set to be larger than those of the other notches 21A. Although the thickness is increased, the thickness of the notch 21 adjacent to the right side surface of the plates 11 and 12 and the notch 21 adjacent to the left side surface of the auxiliary ring 30 is the thickness of the adjacent non-notch region 23. It is thinner than. As described above, the thickness of one blade 20 as a whole increases with increasing distance from the fitting end 20a (toward the left side), so that the notch portion adjacent to the right side surface of the plates 11 and 12 is used. 21 and the notch 21 adjacent to the left side surface of the auxiliary ring 30 are less likely to be damaged by the blade 20 even if the notch 21 is not thick like the notches 21B and 21C. In the present embodiment, only the notch 21B adjacent to the left surface of the plates 10 and 11 and the notch 21C adjacent to the right surface of the auxiliary ring 30 are thicker than the other notches 21A. As a result, it is possible to efficiently prevent the blades 20 from being damaged while suppressing a decrease in the noise reduction effect.

  As mentioned above, although embodiment of this invention was described, it should be thought that the specific structure of this invention is not limited to the said embodiment. The scope of the present invention is shown not only by the description of the above-described embodiment but also by the scope of claims for patent, and further includes meanings equivalent to the scope of claims for patent and all modifications within the scope. Note that the following modifications can be implemented in combination as appropriate.

  In the above embodiment, the impellers 41 and 42 include the auxiliary ring 30 as a support member of the blade 20, but the auxiliary ring 30 may not be provided as illustrated in FIG. 10, for example.

  In the said embodiment, although the shape of the notch part 21 is V shape (triangle shape), it is not limited to this shape, A circular arc shape and square shape may be sufficient.

  In the above embodiment, the sizes (width and depth) of the plurality of notches 21 are all the same, but may be different.

  In the above-described embodiment, in the single blade 20, the plurality of cutout portions 21 </ b> A and 21 </ b> B are arranged at equal intervals in the axial direction.

  In the above embodiment, the depression 24 is formed in the negative pressure surface 20b of the non-notched region 23, but the depression 24 may not be provided.

  In the blade 20 of the above embodiment, the thinned axial range is only the cutout region 22A, but the thinned range is the cutout region 22A, for example, like the blade 120 shown in FIG. Not only that, it may extend slightly to the non-notched region 23. According to this configuration, the thickness of the cutout portion (first cutout portion) 121A is made thinner than the thickness of the cutout portion 21A of the above embodiment without providing a portion where the thickness of the blade 20 changes rapidly. Can do.

In the above embodiment, only the notch 21B adjacent to the left surface of the plates 10 and 11 and the notch 21C adjacent to the right surface of the auxiliary ring 30 are thicker than the other notches 21A. However, the number and position of the notches 21 for increasing the thickness are not limited to this. However, it is preferable to increase the thickness of the notch portion where the blade is easily damaged when subjected to external force.
For example, like a blade 220 shown in FIG. 9, in addition to the notches 21B and 21C, a notch 221D adjacent to the right side of the support plate 11 (or the end plate 12) and a left side of the auxiliary ring 30 The thickness of the notch part 221E adjacent to may be made thicker than the other notch parts 21A.
Further, for example, like a blade 320 shown in FIG. 10, a notch 21B adjacent to the left side surface of the support plate 11 (or the end plate 10), a notch 321C adjacent to the left side of the notch 21B, The thickness of the notch 321D adjacent to the right surface of the support plate 11 (or end plate 12) and the notch 321E adjacent to the right of the notch 321D is made thicker than the other notches 21A. May be.
In addition, when two or more thick notches are adjacent to each other without sandwiching the support member (plates 10 to 12 and auxiliary ring 30) (for example, in the case of FIG. 10), the thickness of the two or more notches May be substantially the same, and the closer to the support member, the thicker the thickness may be.

  In the said embodiment, in one blade | wing 20, the thickness of the some non-notch area | region 23 is so thin that it approaches the fitting edge part 20a, and the thickness of the blade | wing 20 is as a whole at the fitting edge part 20a. Although it is thinner as it gets closer, it is not limited to this configuration.

  For example, the thicknesses of the plurality of non-notched regions 23 may all be the same, and the thickness of the blades 20 may be constant over the axial direction as a whole.

  In addition, for example, the thickness of the outer wing tip of the plurality of non-notched regions 23 may increase as it approaches the support member (plates 10 to 12 and auxiliary ring 30) that supports the blades 20. If a specific example is given, thickness may become thick toward the auxiliary | assistant ring 30 and the fitting end part 20a from the position of the axial direction substantially center of the auxiliary | assistant ring 30 and the fitting end part 20a. Further, the thickness may increase toward the support plate 11 and the auxiliary ring 30 from a substantially central position in the axial direction between the support plate 11 and the auxiliary ring 30. In this modified example, since the thickness of the portion where the load increases when an external force is applied to the blade 20 is thick, the blade 20 can be more reliably prevented from being damaged.

In the above embodiment, the thicknesses of the cutout portions 21B and 21C are substantially the same as the thickness of the adjacent non-cutout region 23, but the thickness of the cutout portion 421B is, for example, like a blade 420 shown in FIG. It may be thicker than the thickness of the adjacent non-notched region 23. In the case of this modified example, the thickness of the other notched portion 421A may be substantially the same as the thickness of the adjacent non-notched region 23. According to this configuration, the strength of the notches 421A and 421B can be made higher than that of the notches 21A and 21B of the first embodiment.
In FIG. 11, the thickened axial direction range of the blade 420 is only the notch region 22A, but the thickened range is not only the notch region 22A but also the non-notched region. It may be slightly up to 23.

  In the said embodiment, although the example which applied the air blower of this invention to the indoor unit of the air conditioner was mentioned and demonstrated, the apparatus in which the air blower of this invention is used is not limited to the indoor unit of an air conditioner. .

  In the above embodiment, the example in which the present invention is applied to the cross flow fan has been described. However, the application target of the present invention is not limited to this. The present invention includes a fan other than a cross flow fan (for example, a sirocco fan or the like) as long as the fan includes a plurality of blades arranged in the circumferential direction and a plurality of notches are formed at the outer peripheral blade end of the blade. (Turbo fan) is also applicable.

  If this invention is utilized, damage to the blades of the blower can be prevented.

1 Air conditioner indoor unit 4 Blower 10 End plate (support member, plate)
11 Support plate (support member, plate)
12 End plate (support member, plate)
20, 120, 220, 320, 420 Blades 21A, 121A, 421A Notch (first notch)
21B, 21C, 221D, 221E, 321C, 321D, 321E, 421B Notch (second notch)
22A, 22B, 22C Notch region 23 Non-notch region 30 Auxiliary ring (support member)

Claims (6)

A plurality of blades arranged in the circumferential direction ;
A support member for supporting the plurality of blades;
A plurality of notches are formed in the axial direction at the outer wing tip of the blade,
The plurality of notches have at least one or more first notches, the size of which is substantially the same as that of the first notches, and the thickness is greater than that of the first notches. It includes a second notch of,
The blower, wherein the second notch is disposed adjacent to the support member . The thickness of the first notch is thinner than the thickness of the part without the notch provided on both axial sides of the first notch,
The thickness of the second notch is blower of claim 1, wherein the substantially the thickness of the the notch no portions provided on axially opposite sides of the second notch is the same. The thickness of the first notch is substantially the same as or thinner than the thickness of the non-notched portion provided on both axial sides of the first notch,
The blower of claim 1, wherein the thickness of the second notch, wherein the thicker than the thickness of the the notch no portions provided on axially opposite sides of the second notch. The blower according to any one of claims 1 to 3 , wherein a thickness of a portion of the blade on the outer peripheral side where the notch is not formed is thicker toward the support member. The blower according to any one of claims 1 to 4, wherein the support member is an annular or disk-shaped plate that supports an axial end of the blade. The blower according to any one of claims 1 to 5 , wherein the support member is an auxiliary ring that supports an intermediate portion in the axial direction of the blade.

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