JP3107079B2 - Impeller for blower - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a blade of an impeller for a blower.

[0002]

2. Description of the Related Art For example, in an outdoor unit 1 for an air conditioner as shown in FIG. 10, as an air blower, an axial flow type impeller 3 such as a propeller fan is generally rotated as shown in FIG. The blown wind is blown out from the air blowing grill 2 to the outside.

The impeller 3 has a plurality of blades 4,
4, 4 and a plurality of blades 4, 4, 4 integrated with each other and a hub 5 fixed to a drive shaft of a fan motor.

However, such an impeller 3 for a blower is used.
In general, there is a problem that considerable aerodynamic noise is generated by rotation. Therefore, as a method of reducing the aerodynamic noise, various wing shapes have been improved so far. Thereby, the turbulence of the blade surface flow is reduced, and the vortex emitted at the outlet is suppressed.
In such a case, generally, a hard synthetic resin material or a metal material is used as a material for forming the blades 4, 4, and 4.

[0005]

By the way, the state of the air flow sucked by the impeller for a blower as described above is stable, and there is no structure which influences the distribution of the flow in front of the blow direction. In this case, it is possible to stabilize the flow on the blade surface and reduce aerodynamic noise to a considerable level only by improving the shape of the blade having rigidity as described above.

However, in the case where the intake airflow is turbulent or drifts, aerodynamic noise cannot be sufficiently reduced only by improving the blade shape. In other words, it is possible to suppress the occurrence and increase of airflow turbulence, but it is difficult to reduce or eliminate the existing turbulence itself, and to eliminate interference noise between the airflow turbulence and the wing surface at this time. I couldn't do that.

As a method of reducing the interference sound, for example, as shown in FIG. 11, a concave portion 44 is formed on the negative pressure side of the wing body 40, and the concave portion 44 is filled with a synthetic resin foam material to provide elasticity. By forming a porous layer 6 having a texture, it is considered that pressure fluctuations due to turbulence of airflow are absorbed and mitigated to reduce the generation of interference noise (for example, Japanese Patent Laid-Open No. 4-2724).
No. 99).

Reference numeral 40A denotes a front edge of the wing body 40, and 40B denotes a rear edge thereof.

[0009]

However, in the case of the above-described conventional example, the effect of damping the pressure fluctuation due to the interference between the airflow and the blade surface is insufficient, and it is not always possible to effectively absorb the pressure fluctuation. If the operation cannot be performed for a long period of time, dust in the airflow blocks the opening on the surface of the porous layer 6, and the effect of absorbing and absorbing the pressure fluctuation is lost. If the wing surface becomes rough due to the adhesion of dust, there arises a problem that the aerodynamic noise is increased.

The invention of this application has been made in order to solve such a problem, and the local pressure in each area of the suction surface is exploited by utilizing the sufficient elasticity of each air layer of a large number of cavities. While achieving sufficient pressure fluctuation absorption by effectively and appropriately absorbing the fluctuations, the pressure caused by turbulence in the wing surface flow is prevented by preventing the porous layer opening surface from being blocked or roughened by dust. It is an object of the present invention to provide an impeller for a blower in which local absorption and mitigation of fluctuations are maintained for a long time, and generation of aerodynamic noise due to interference with a blade surface can be effectively and sufficiently reduced over a long period of time. It is.

[0011]

Means for Solving the Problems In order to achieve the above object, the invention of this application is provided with the following means for solving the problems.

(1) The impeller for a blower according to the present invention is such that the negative pressure surface side of the blade body 40 is formed in a honeycomb structure 45 having a large number of cavities 45a, 45a. Each of the cavity portions 45a, 45a
.. by connecting the suction surface side opening surface portions of the small holes 42a, 42a,.
And is opened to the negative pressure side via a thin plate 42 having

According to the structure, the honeycomb structure 45 is formed.
Of the cavity portions 45a, 45a,.
5a, 45a...
are open to the negative pressure side through the small holes 42a, 42a,..., and the small holes 42a, 42a. In addition to preventing the intrusion, the air layer in each of the cavities 45a, 45a,. As a result, absorption and mitigation are effectively performed locally over a long period of time, so that generation of sound due to interference with the wing surface can be sufficiently and effectively reduced over a long period of time.

(2) According to the second aspect of the present invention, in the blower impeller of the present invention, the negative pressure side of the blade body 40 is formed in a honeycomb structure 45 having a large number of cavities 45a, 45a,. Each of the cavity portions 45a, 45a
.. Is in contact with the negative pressure surface via an elastic thin film 46.

Therefore, in this configuration, a large number of cavities 45a, 45a,... Of the honeycomb structure 45 are interposed through the elastic thin film 46 that covers the cavities 45a, 45a,. The cavity portions 45a, 45a,
45a... Are prevented from entering the inside, and the function as a more effective and sufficiently elastic damping means is exerted. Pressure fluctuations are effectively absorbed and alleviated locally over a long period of time, so that sound generation due to interference with the wing surface can be sufficiently and effectively reduced over a long period of time.

(3) The blower impeller according to the third aspect of the present invention is such that the negative pressure surface side of the blade body 40 is formed in a honeycomb structure 45 having a large number of cavities 45a, 45a,. Each of the cavity portions 45a, 45a
Are formed in desired cross-sectional shapes different from each other.

Accordingly, in this configuration, the air layers in the cavity portions 45a, 45a,... Having different desired cross-sectional shapes on the suction side of the wing body 40 composed of the honeycomb structure 45 are effectively localized. Pressure fluctuations are absorbed.

(4) The invention of claim 4 The blower impeller according to the present invention, in the structure of the invention described in claim 1 or 2, has the cavity portions 45a, 45a,.
Are characterized in that they have different desired cross-sectional shapes.

Therefore, in this configuration, the wing body 40 according to the first or second aspect of the present invention forms the honeycomb structure 45.
Cavity sections 4 having different desired cross-sectional shapes on the suction side of
The air layer in 5a, 45a... Makes it possible to more effectively absorb local pressure fluctuations.

(5) A fifth aspect of the present invention, in the blower impeller according to the first, second, third or fourth aspect of the present invention, is a honeycomb formed on the negative pressure side of the wing body 40. It is characterized in that the structure 45 is formed integrally with the wing body 40 by a synthetic resin material.

Therefore, in this configuration, the honeycomb structure 45 is integrally formed of synthetic resin on the negative pressure surface side of the wing main body 40, so that a large number of cavities 45a, 45a can be easily formed on the negative pressure surface side of the wing main body 40. .. Can be formed.

(6) The invention of claim 6 The blower impeller according to the present invention, in the configuration of the invention described in claim 1, 2, 3 or 4, has a honeycomb formed on the negative pressure surface side of the wing body 40. The structure 45 is formed separately from the wing main body 40 using a synthetic resin material, and the recess 4 of the wing main body 40 is formed.
It is characterized in that it is fitted into and integrated with the inside of the housing 4.

Therefore, in this structure, the honeycomb structure 45 is formed separately from the wing body 40 by using a synthetic resin material in advance, and then the concave portion 4 formed on the negative pressure side of the wing body 40 is formed.
4 and fitted together, the wing body 40
Are easily provided on the side of the negative pressure surface.
Can be formed.

[0024]

As described above, according to the impeller for a blower of the present invention, the effect of absorbing local pressure fluctuations is high, and the aerodynamic noise reduction effect is effective for a long period regardless of the operation time. It is possible to provide an impeller for a blower having:

[0025]

(Embodiment 1) First, FIGS. 1 and 2 show Embodiment 1 of the present invention.
1 shows the structure of the wing of the impeller for a blower according to the present invention.

In the figure, first, reference numeral 4 denotes a blade used for an impeller of an axial flow type blower such as the above-described propeller fan, and the blade 4 is fitted to a drive shaft on a fan motor side as shown in the drawing. It is integrally formed with the hub 5 to be fixed and a synthetic resin material.

The wing body 40 of the wing 4 has an airfoil structure that is thicker on the leading edge 40A side and thinner on the trailing edge 40B side. 40B
The region other than the region where the turbulence of the flow is likely to occur is made of synthetic resin having a large number of cavities 45a, 45a,... Is provided, for example, by integral molding with the wing body 40.

A thin plate 42 also made of synthetic resin is welded over the entire surface of the honeycomb structure 45 to the cavities 45a, 45a,. The coaxial portions of the thin plate 42 corresponding to the cavities 45a, 45a,... Are provided with small holes 42a, 42a,. . Then, each of the cavity portions 45a, 45a
Are opened to the outside on the suction surface side through the small holes 42a, 42a,... So as to absorb local pressure fluctuations generated on the suction surface side, and at the same time, dust and the like adhere to the suction surface side. Covered to prevent intrusion.

As described above, in the blade portion of the impeller for a blower as described above, the structure of the airflow to be sucked is stable, and a structure which affects the distribution of the flow forward in the blowing direction is provided. If not present, it is possible to stabilize the flow on the wing surface and reduce aerodynamic noise to a considerable level only by improving the wing shape. However, if the intake airflow is turbulent or drifts, aerodynamic noise cannot be sufficiently reduced only by improving the blade shape. In other words, it is possible to suppress the occurrence and increase of airflow turbulence, but it is difficult to reduce or eliminate the existing turbulence itself, and to eliminate interference noise between the airflow turbulence and the wing surface at this time. It is not possible.

Therefore, as a method of reducing such interference noise, a concave portion 44 is formed on the negative pressure side of the blade body 40 as shown in FIG. By filling the material to form the elastic porous layer 6, it is conceivable that pressure fluctuations due to turbulence of the airflow are locally absorbed to reduce the generation of interference noise.

However, in the case of this configuration, the function of damping the pressure fluctuation generated on the suction surface side is insufficient, and the depth of the hole of the porous layer 6 is shallow, and each opening surface of the outer surface is formed as a blade suction surface. Because it is open to the side in the same state,
When the blower is operated for a long time, dust in the airflow adheres and penetrates as the operation time elapses and closes the opening of the hole on the outer surface of the porous layer 6, so that not only the pressure fluctuation absorbing effect as described above is lost but also the dust is absorbed. Adhesion causes the wing surface to become rough, which in turn causes aerodynamic noise to rise.

However, in the blade configuration of the impeller for a blower having the above configuration, first, a large number of cavities 45a, 45a.
Are formed, and the openings on the negative pressure side of the cavities 45a, 45a,.
are opened to the negative pressure side while covering through a thin plate 42 having a, 42a.

Therefore, according to this configuration, the thin plate 4
The two small holes 42a, 42a...
a, 45a... prevents the intrusion of dust and the like into the interior, and opens the deep cavity portions 45a, 45a. Pressure fluctuations due to turbulence in the flow are locally absorbed and alleviated, and sound generation due to interference with the wing surface can be effectively reduced.

As a result, it is possible to provide an impeller for a blower which can maintain an effective aerodynamic noise reduction effect for a long time regardless of the elapse of the operation time.

(Modification 1) The honeycomb structure 45 having the above structure is not formed by integrally forming the thin plate 42 on the wing body 40 side as described above, but by welding, for example, as shown in FIG. From the beginning, a thin plate 42 may be formed and placed separately with the thin plate 42, which may be fitted into a concave portion 44 having a predetermined depth formed on the negative pressure surface side of the wing body 40 to be welded and integrated. it can.

(Modifications 2 and 3) In the above configuration, the wing body 40 is provided as described above.
Of the cavity portions 45a, 45a.
The cross-sectional shape of each of the cavities 45a, 45a,... In the honeycomb structure 45 is the same, but the state of occurrence of pressure fluctuation differs depending on the location. Therefore, the respective cavity portions 45a, 45a
The cross-sectional shape is, for example, different from each other in diameter φ and depth V as in Modification 2 of FIG. 5, or is changed into diameter φ and depth V as in Modification 3 in FIG. In addition, the shape of the bottom part B can be changed mutually.

(Embodiment 2) Next, FIGS. 7 to 9 show the configuration of the blades of a fan for a blower according to Embodiment 2 of the present invention.

In this embodiment, a honeycomb structure 45 having a large number of cavities 45a, 45a... Similar to that of the first embodiment is connected to the negative of the wing body 40 as shown in FIGS. Are integrally formed on the pressure surface side, the openings 47, 47,... Having the same diameter on the suction surface side are closed by an elastic thin film 46, and the cavities 45a, 45a,.
The present invention is characterized in that the pressure fluctuation generated on the suction surface side is locally effectively absorbed and alleviated by the elastic deformation corresponding to the pressure fluctuation generated on the suction surface side inward.

Therefore, according to this configuration, each cavity 4
.. Realize a sufficient pressure fluctuation absorbing action through the thin film 46, and the thin film 46 surely prevents intrusion of dust and the like into each of the cavities 45a, 45a. , Without affecting the interference sound absorbing action of the cavities 45a, 45a, and locally absorbing and mitigating the pressure fluctuation due to the turbulence of the wing surface flow for a long period of time, and Generation of sound due to interference can be effectively reduced.

As a result, it is possible to provide an impeller for a blower which can maintain an effective aerodynamic noise reduction effect for a long time regardless of the elapse of the operation time.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view (AA in FIG. 2) of a blade portion of an impeller for a blower according to Embodiment 1 of the present invention.

FIG. 2 is a plan view of the wing.

FIG. 3 is an enlarged sectional view of a main part of the wing.

FIG. 4 is an enlarged sectional view of a first modification of the wing.

FIG. 5 is an enlarged sectional view of a second modification of the wing.

FIG. 6 is an enlarged sectional view of a third modification of the wing.

FIG. 7 is a cross-sectional view (AA in FIG. 7) of a blade portion of a blower impeller according to a second embodiment of the present invention;

FIG. 8 is a plan view of the wing.

FIG. 9 is an enlarged sectional view of a main part of the wing.

FIG. 10 is a front view of a conventional general outdoor unit for an air conditioner.

FIG. 11 is a cross-sectional view showing a structure of a conventional example of a wing used in an impeller for a blower of the outdoor unit.

[Explanation of symbols]

4 is a wing, 40 is a wing body, 42 is a thin plate, 42a is a small hole,
4 is a concave portion, 45 is a honeycomb structure, 45a is a hollow portion, 4
6 is a thin film and 47 is an opening.

Claims (6)

(57) [Claims] 1. A suction structure side of a wing body (40) is formed in a honeycomb structure (45) having a large number of cavities (45a), (45a) . ), (4
5a), the opening surface of the negative pressure surface side is replaced with a small hole (42a),
(42a)... Through a thin plate (42) having
An impeller for a blower, which is open to the side . 2. The air suction side of the wing body (40) is provided with a large number of vacancies.
Honeycomb structure having body portions (45a), (45a)...
Formed in the structure (45), and the cavity portions (45a), (4
5a)... Through the elastic thin film (46)
An impeller for a blower, which is in contact with a pressure surface . 3. The air suction side of the wing body (40) is provided with a large number of vacancies.
Honeycomb structure having body portions (45a), (45a)...
Formed in the structure (45), and the cavity portions (45a), (4
5a)... Are respectively different desired cross-sectional shapes.
An impeller for a blower, wherein the impeller is formed as follows . 4. Each cavity (45a), (45a)...
3. The impeller for a blower according to claim 1 or 2, wherein each of said plurality of impellers has a different desired cross-sectional shape. 5. The impeller for a blower according to claim 1, wherein the honeycomb structure (45) is formed integrally with the blade body (40) by a synthetic resin material. 6. The honeycomb structure (45) is formed of a synthetic resin material separately from the wing body (40).
The impeller for a blower according to claim 1, 2, 3 or 4, wherein the impeller is integrated by fitting into the recess (44) of (0).