JP2006300375A - Blower device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress pressure fluctuation of a wire surface to reduce fluid noises by adding fur to the wire surface in a fan guard. <P>SOLUTION: In this blower device, fur 2 is added to the wire surface in the fan guard 1 to straighten a vortex formed from the wire constituting the fan guard, and pressure fluctuation of the wire surface is suppressed to reduce fluid noises. Since a spatial position with large vortex fluctuation is on the back wash side, i.e., a distant position from the wire, pressure fluctuation of the wire surface is suppressed to reduce fluid noises. <P>COPYRIGHT: (C)2007,JPO&INPIT

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.

  That is, in Claim 1, in the air blower which mounts an air blower fan using at least one of a fan guard and a shroud, soft hair or a raised material is added to at least one surface of the fan guard and the shroud.

  In Claim 2, in the air blower which mounts an air blower fan using at least one of a fan guard and a shroud, a chain | strand material or raising or a fur material is used as a wire which comprises a fan guard.

  According to a third aspect of the present invention, in the blower device that covers the shroud on the blower fan, the material constituting the shroud is a sound absorbing material or a porous material.

  According to a fourth aspect of the present invention, in the blower device according to the first aspect, a chain member is used as the wire constituting the fan guard.

  According to a fifth aspect of the present invention, in the blower device according to the first, second, or fourth aspect, the material constituting the shroud is a sound absorbing material or a porous material.

  According to a sixth aspect of the present invention, in the blower device according to the third or fifth aspect, the shroud surface is coated with a member having weather resistance.

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

According to the first aspect, the pressure fluctuation on the surface of the wire is suppressed, and the fluid noise can be reduced.
That is, when soft hair is added to the surface of the wire rod to the fan guard, the vortex generated from the wire rod constituting the fan guard is rectified, and the pressure fluctuation on the surface of the wire rod is suppressed. 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.
Further, when soft hair is added to the surface of the shroud, the same effect as described above is obtained.

In Claim 2, since the pressure fluctuation of the wire surface is suppressed, fluid noise can be reduced.
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 wire, unevenness occurs in the length direction of the wire, so that the length of the two-dimensional vortex is shortened and pressure fluctuation on the surface of the wire is suppressed, so that the fluid noise reduction effect is achieved. is there.
Moreover, when raising or a fur raw material is used as a wire, there exists an effect which suppresses a vortex fluctuation similarly to Claim 1.

  According to the third aspect of the present invention, the energy of the generated sound pressure is absorbed, and even if pressure fluctuation due to vortex fluctuation occurs, no sound is radiated, so that there is an effect of reducing fluid noise.

  According to the fourth aspect of the present invention, there is a synergistic effect on fluid noise reduction by suppressing the pressure on the surface of the wire and shortening the two-dimensional vortex in the length direction of the wire.

  In the fifth aspect, the effect of not emitting sound is added to the effect of the fourth aspect, and there is a further fluid noise reduction effect.

  According to the sixth aspect of the present invention, the durability of the shroud is improved in an environment where weather resistance is required.

Next, embodiments of the invention will be described.
FIG. 1 is a side view of a conventional outdoor unit of an air conditioner, FIG. 2A is a plan view showing the overall configuration of a fan guard according to an embodiment of the present invention, and FIG. FIG. 3A is a plan view showing the overall structure of a fan guard according to another embodiment of the present invention, FIG. 3B is a cross-sectional view thereof, and FIG. 4 is according to another embodiment of the present invention. FIG. 5 is a perspective view of a shroud according to another embodiment of the present invention.

  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.
Further, in this embodiment, the fan guard shape is a circular beam, but the effect of the invention does not change even when the horizontal beam or the rectangular beam is used.

Next, the fan guard 3 shown in FIG.
The fan guard 3 has a circular outer frame 23 fixed to the opening on the blowout side of the shroud 7 and a plurality of radii 22, 22. .. 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 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 this embodiment, a spherical chain 6 having a bead structure in which convex portions are formed into a spherical shape 24 and concave portions are formed into a node portion 25 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 chain 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 embodiment, a sound absorbing material is adhered 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 embodiment, 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 drawings, an example in which soft hair is added to the surface of the shroud 7 should be described. The role of the added soft hair is the same as when it is added to the wire, and the description thereof is omitted.
Some embodiments 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. 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.

The 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 one Example of this invention. (B) Detail drawing. (A) The top view which showed the whole structure of the fan guard based on another Example of this invention. (B) Cross section similarly. The top view of the spherical chain chain which concerns on another Example of this invention. The perspective view of the shroud which concerns on another Example of this invention.

Explanation of symbols

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

Claims (6)

In the blower device that covers the blower fan using at least one of the fan guard and the shroud,
A blower characterized in that soft or raised material is added to at least one surface of a fan guard and a shroud. In the blower device that covers the blower fan using at least one of the fan guard and the shroud,
A blower characterized in that a chain material or a raised or soft material is used as a wire constituting the fan guard. In the blower device that covers the shroud on the blower fan,
An air blower characterized in that a material constituting the shroud is a sound absorbing material or a porous material. The blower device according to claim 1,
A blower characterized in that a chain member is used as a wire constituting the fan guard. In the air blower according to claim 1 or claim 2 or claim 4,
An air blower characterized in that a material constituting the shroud is a sound absorbing material or a porous material. In the air blower of Claim 3 or Claim 5,
A blower characterized in that a shroud surface is coated with a weather-resistant member.

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