JP4764058B2 - Blower - Google Patents

Description

  The present invention relates to a blower provided in an air conditioner, a ventilation fan, or the like, and more particularly to a fan guard and shroud technique for mounting a fan in the blower.

  Conventionally, a fan guard attached to a blower side of a blower for safety against a rotating object (fan) at a blower outlet of the blower is known. Here, the pitch of the fan guard lattice is determined so that the test finger defined by the standard does not easily enter. In addition, a shroud that is disposed outside a blower fan that can blow air by rotation and guides the flow of air is also known.

  Since the above-mentioned fan guard is used for an outdoor unit and a ventilation fan of an air conditioner, functions of foreign matter entry and human body protection are required, and low noise is also required. The airflow passing through the fan guard is separated and vortexed away at the wake of the wire constituting the fan guard. Since this vortex fluctuates periodically, pressure fluctuation occurs on the surface of the wire and so-called fluid noise is generated. In general, if the wire pitch constituting the fan guard is increased, this noise problem can be avoided, but this contradicts the functions of foreign matter entry and human body protection. On the other hand, with respect to the shroud, vortices generated with the rotational movement of the fan fluctuate, and pressure fluctuations occur on the shroud surface, so that fluid noise is generated. Generally, noise is reduced by optimizing the dimensions of the shroud. However, it can be said that there is no optimum dimension for low noise by using only the shroud.

In view of the above technical background, Patent Document 1 introduces an invention in which an air conditioner outdoor unit front grill has an airfoil-shaped cross section in the impeller shaft direction of the grill and the mounting angle is matched to the mainstream direction. This shape can suppress peeling sound and interference sound lower than the conventional shape. Moreover, in patent document 2, in the outdoor unit front grille of the air conditioner, the structure other than the outer frame of the fan guard is not parallel to the trailing edge of the windward wind direction control blade or the front edge of the windward control blade on the leeward side. The occurrence of wind noise is reduced by reducing the interference points.
JP-A-5-71766 Japanese Patent Laid-Open No. 10-160232

  The problem to be solved is to reduce fluid noise in the blower. Although the shape of the fluid noise reduction device is publicly known in Patent Literature 1 and Patent Literature 2, fluid noise can be reduced by another method based on the demand for further low noise.

  The problem to be solved by the present invention is as described above. Next, means for solving this problem will be described.

In Claim 1 , in the air blower which mounts a ventilation fan (17) using a fan guard (3) and a shroud (7), this fan guard (3) is in the blowing side opening part of a shroud (7). A circular outer frame (23) is fixed, and a circular beam (22, 22...) In which a plurality of radii are shortened by a predetermined size is arranged on a plane on the center side of the outer frame (23), and is radially arranged. A circular beam (22) fixed integrally with the arranged support rods (21, 21...) And positioned on the outermost peripheral side of the outer frame (23) and the circular beam (22, 22...). ) Is stretched in a substantially radial direction at predetermined intervals, and the string material (9) constituting the fan guard (1) is provided with irregularities in the length direction, Spherical chain member with a rosary structure in which the concave and convex portions are formed in a spherical shape (24) and the concave portion is formed in a node portion (25). And 6), the surface of the fan guard (1) is obtained by adding the fur (2) or brushed material (4).

  As effects of the present invention, the following effects can be obtained.

In Claim 1 , in the air blower which mounts a ventilation fan (17) using a fan guard (3) and a shroud (7), this fan guard (3) is in the blowing side opening part of a shroud (7). A circular outer frame (23) is fixed, and a circular beam (22, 22...) In which a plurality of radii are shortened by a predetermined size is arranged on a plane on the center side of the outer frame (23), and is radially arranged. A circular beam (22) fixed integrally with the arranged support rods (21, 21...) And positioned on the outermost peripheral side of the outer frame (23) and the circular beam (22, 22...). ) Is stretched in a substantially radial direction at predetermined intervals, and the string material (9) constituting the fan guard (1) is provided with irregularities in the length direction, Spherical chain member with a rosary structure in which the concave and convex portions are formed in a spherical shape (24) and the concave portion is formed in a node portion (25). 6), and the soft hair (2) or the raised material (4) is added to the surface of the fan guard (1), so that the pressure fluctuation on the surface of the string-like material (9) is suppressed, so that the fluid noise is reduced. Can be reduced.

  The vortex peeled off by the fur material can be subdivided and rectified, and at the same time, the peeled vortex can be guided as far as possible from the substrate.

Further, when soft hair is added to the surface of the wire rod to the fan guard, vortices generated from the wire rod constituting the fan guard are rectified, and pressure fluctuation on the surface of the wire rod is suppressed, so that there is an effect of reducing fluid noise.
Further, since the spatial position where the vortex fluctuation is large is the wake side, that is, a position far from the wire, the pressure fluctuation on the surface of the wire is suppressed, and there is an effect of reducing fluid noise.

That is, since the conventional shape has no irregularities in the length direction of the wire constituting the fan guard, a two-dimensional vortex having a certain length parallel to the length direction of the wire is generated.
Therefore, when a chain material is used as the string-like material (9), unevenness occurs in the length direction of the wire, so the length of the two-dimensional vortex is shortened, and the pressure fluctuation on the surface of the string-like material (9) Is effective in reducing fluid noise.

  Next, embodiments of the invention will be described.

  FIG. 1 is a side view of an outdoor unit of a conventional air conditioner.

FIG. 2A is a plan view showing an overall configuration of a fan guard according to one configuration example .

  FIG. 2B is an enlarged view of the same.

3 (a) is a plan view showing an overall structure of a fan guard according to the actual施例of the present invention.

  FIG. 3B is a sectional view of the same.

  FIG. 4 is a plan view of a spherical chain according to an embodiment of the present invention.

FIG. 5 is a perspective view of a shroud according to another configuration example .

  The form of the present invention is provided in a blower, and does not specifically refer to what the blower is used for. However, in general, the present invention can be applied to an air outlet of a ventilation fan or an outdoor unit outlet of an air conditioner.

  First, the conventional outdoor unit of the air conditioner shown in FIG. 1 will be described. Here, a general outdoor unit is taken as an example. Generally, in the outdoor unit 10 of the air conditioner, a heat exchanger 11 for exchanging heat between refrigerant and air is disposed downstream of the blower fan 17, and the blowing direction is an arrow α in the figure. The heat exchanger 11 includes fins 12 for improving the heat transfer coefficient in the pipe 13 through which the refrigerant passes, and can efficiently exchange heat between the air and the refrigerant. The blower fan 17 is driven by an electric motor 14 supported by an electric motor support, and blows air by rotational movement. Here, the shroud 7 is disposed around the outside of the blower fan 17 and has a function of guiding the flow of air. The fan guard 1 is attached to the blower side of the blower, that is, the blowout side opening of the shroud 7 for safety against a rotating object (fan).

Next, the fan guard 1 shown in FIG. This fan guard 1 has a circular outer frame 23 fixed to the opening on the blowout side of the shroud 7, and the outer frame 23 is connected to the circular rails 22, 22. It arrange | positions on the inside same inside, and is fixed integrally by the support rods 21 * 21 ... arrange | positioned radially. As shown in FIG. 2 (b), the fan guard 1 has soft hair 2 added to the surface of the base material constituting the support bar 21, the circular beam 22, and the outer frame 23. Here, the base material to which the fur 2 is added (or pasted) is constituted by a wire, a band, a punching process, or the like, and the base may be made of iron, resin, or the like, and any material may be used. Furthermore, as an addition method, after applying an adhesive etc. to the base-material surface, the fur 2 is made to adhere. Here, the role of the added soft hair 2 will be described. Usually, when wind passes through the fan guard, a separated vortex is generated on the downstream side of the fan guard. As described above, this vortex fluctuation causes pressure fluctuations on the substrate surface, and so-called fluid noise is generated. The soft hair 2 added here subdivides and rectifies the separated vortex. Simultaneously with this role, it also serves to guide the separated vortex as far as possible from the substrate. Even if the fan guard itself is made of a fur material, the same effect as described above can be obtained. In this configuration example , the fan guard shape of a circular beam is used. However, the effect is not changed even in a configuration using a horizontal beam or a rectangular beam .

  Next, the fan guard 3 shown in FIG. This fan guard 3 has a circular outer frame 23 fixed to the opening on the blowout side of the shroud 7, and a circular beam 22, 22... With a plurality of radii shortened by a predetermined size on the center side of the outer frame 23. .. Are arranged on the same plane and fixed integrally with the support rods 21, 21... Arranged radially, and further located on the outermost peripheral side of the outer frame 23 and the circular rows 22. A string-like material 9 is stretched between the circular rails 22 in a substantially radial direction at predetermined intervals. As for the string-like material 9, the surface is made into the raising raw material 4, as shown in FIG.3 (b). Here, the core material 5 may be a flexible material such as a thread, string, or tube, or may be a hard material such as a metal wire. Here, the role of the raised material 4 on the surface is equivalent to the soft hair 2 described above, and the description thereof is omitted. Further, the fan guard itself may be formed of a raised material. In the present embodiment, the fan guard shape in which the circular beam is deformed is used for ease of processing, but the effect of the invention does not change even when the horizontal beam or the rectangular beam is used.

  Next, the spherical chain member 6 shown in FIG. 4 will be described. Unlike the conventional wire rod constituting the fan guard, it is characterized in that unevenness is provided in the length direction. In the present embodiment, a spherical chain member 6 having a convex structure with a spherical shape 24 and a concave portion with a node portion 25 and having a bead structure is attached in place of the string-like material 9. Although the convex portion has been shown to be spherical, an elliptical sphere or an eccentric sphere may be used, and equivalent effects can be obtained if there are irregularities in the length direction. Here, when the wire material of a fan guard is made into the spherical chain member 6, there exists an effect which can shorten the peeled vortex mentioned above. Further, the shape and material of the fan guard are not particularly limited in this embodiment.

Next, the shroud 7 shown in FIG. 5 will be described. In this configuration example , a sound absorbing material is attached to the surface of the shroud 7. The fan guard was equipped with the first fan guard. Air blowing is in the direction of arrow α. This sound-absorbing material absorbs the energy of the generated sound pressure in the space inside the shroud, and does not reflect any pressure fluctuations caused by vortex fluctuations, thus providing a noise reduction effect. The sound absorbing material can be composed of sponge, foamed resin, or a sheet-like member having a large number of irregularities on the surface. In the present configuration example, the surface of the shroud 7 is made of a sound absorbing material. However, for example, the same effect can be obtained even if the shroud 7 itself is made of a porous material.

  Further, for the shroud 7 shown in FIG. 5, the above-described sound absorbing material is coated with a weather resistant material in order to improve the weather resistance. As the weather-resistant material, for example, a waterproof sheet or a water-repellent sheet can be considered, but it is selected according to the environment that can be tolerated. That is, a light shielding material may be employed if light resistance is required, and a heat resistant or heat insulating material may be employed if heat resistance is required.

Here, although not shown in the drawing, it is also desirable to describe a configuration example in which soft hair is added to the surface of the shroud 7. The role of the added soft hair is the same as when it is added to the wire, and the description thereof is omitted. Several embodiments and configuration examples of the fan guard and the shroud have been described for reducing the fluid noise of the blower. It goes without saying that further noise reduction is possible by combining these embodiments and configuration examples . For example, the support rod 21 and the circular beam 22 are constituted by a spherical chain, and further, soft hair 2 is added to the surface of the spherical chain, or the sound absorbing member or weather resistance is attached to the shroud to which the fan guard 1 or 3 is attached. They are coated with materials.

It is a side view of the outdoor unit of the conventional air conditioning apparatus. (A) The top view which showed the whole structure of the fan guard which concerns on the example of 1 structure . (B) is the figure which showed the expansion similarly. (A) is a plan view showing an overall structure of a fan guard according to the actual施例of the present invention. (B) is also a cross-sectional view. The top view of the spherical chain which concerns on the Example of this invention. It is a perspective view of the shroud which concerns on the other structural example .

1 Fan guard 2 Soft hair 3 Fan guard 4 Brushed material 6 Spherical chain 7 Shroud

Claims (1)

In the air blower which mounts the air blowing fan (17) using the fan guard (3) and the shroud (7), the fan guard (3) is formed in a circular outer frame (23 at the blowout side opening of the shroud (7). ), And a circular beam (22, 22...) In which a plurality of radii are shortened by a predetermined dimension on the center side of the outer frame (23) is arranged on a plane, and support rods (21 ·······, and a string between the outer frame (23) and the circular beam (22) located on the outermost side of the circular beam (22, 22 ...). The string-like material (9) is stretched in a substantially radial direction at predetermined intervals, and the string-like material (9) constituting the fan guard (1) is provided with irregularities in the length direction, and the irregularities are spherical. (24), a spherical chain member (6) having a rosary structure with a concave portion formed in a node portion (25), and the fan On the surface of the over-de (1), blower, characterized in that added with fur (2) or brushed material (4).

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