JPH0744893Y2 - Fan guard - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fan guard arranged so as to cover a cooling fan portion of a heat exchanger such as an air conditioner.

[0002]

2. Description of the Related Art A cooling fan installation portion of a heat exchanger is covered with a fan guard in order to prevent foreign matters from entering a fan rotation region while ensuring air permeability. This fan guard is formed of a wire rod arranged in a wire mesh shape or a state where narrow slits are continuous, a metal porous plate or a synthetic resin porous plate.

However, when the fan guard is formed of a metal perforated plate or a synthetic resin perforated plate, the aperture ratio cannot be made sufficiently large, the cooling efficiency as the heat exchanger is low, and the heat exchanger is formed large. There is a problem of having to do it. Therefore, conventionally, many metal wires are arranged in the shape of a wire mesh, or the metal wires are arranged in a shape in which narrow slits are continuous.

When the fan guard is formed in the shape of a wire mesh, since the eyes must be made fine, there is a problem that the aperture ratio is small and the cooling efficiency is low. Therefore, when arranging the metal wire in a state where the narrow slits are continuous, the shape-retaining material is arranged radially, and the wire material is spirally arranged on the upper side of this shape-retaining material, or the diameter formed by the wire material is different. The ring bodies were arranged in concentric circles.

[0004]

[Problems to be Solved by the Invention] In fan guards, it is obligatory to set the interval formed between adjacent wire rods to a size that does not pass even when the finger of an infant is pushed. In a fan guard with a shape in which narrow slits are continuous, the wires are arranged with a pitch smaller than the standard size so that the wires can be bent even if a certain pressing force acts on the wires. is doing. Therefore, there are many welding points and the manufacturing cost becomes high.
Further, when the wire is arranged with fine pitches, there are problems that the aperture ratio is low, the air resistance is large, the cooling efficiency is low, and the noise due to wind noise is large.

The present invention has been made paying attention to such a point. Even if the pressing force acts, the distance between the wire rods can be suppressed to a predetermined dimension or less, but the arrangement pitch can be made as large as possible. The purpose is to provide a fan guard that can be made larger in size.

[0006]

In order to achieve the above object, the present invention provides a method in which metal wire rods having different aspect ratios are spirally formed at a predetermined pitch in a vertically long posture on the upper surface of a radially arranged shape retention material. It is characterized in that the metal wire rod and the shape-retaining material are fixed by welding.

[0007]

In the present invention, metal wire rods having different aspect ratios are spirally arranged in a vertically long posture on the upper surface of the radially arranged shape retention member, and the contact portion between the metal wire rod and the shape retention member is fixed by welding. Since it is difficult to bend due to the pressing force from the front surface of the fangart, it is possible to prevent the distance between the adjacent wire rods from being widened due to the deformation. You can

As a result, the opening area can be widened, the ventilation resistance can be reduced, the cooling efficiency of the heat exchanger can be improved, and the noise due to the wind noise can be reduced.

[0009]

1 is a plan view and FIG. 2 is a sectional view taken along the line II--II of FIG. This fan guard consists of the shape-retaining material (1) arranged radially and this shape-retaining material.
It is composed of a metal wire (2) spirally arranged on the upper surface of (1) and a center plate (3) arranged in the center of the plane.

The shape-retaining material (1) is composed of four main shape-retaining materials (4) arranged at 90 ° intervals and a sub-shape-retaining material (5) arranged between the main shape-retaining materials (4). The main shape retention material (4) is welded and fixed to the back surface of the center plate (3). Further, the auxiliary shape-retaining material (5) is arranged so as to receive several pitches of the outer side portion of the spiral wire (2).

The spirally arranged metal wire (2) is composed of a deformed wire deformed into an oval cross section by passing an iron wire having a circular cross section through a die. This metal wire (2) is shown in FIG. As shown in the figure, the shape retention material
It is placed on the upper side of (1) and fixed by welding.

As described above, the metal wire rod (2) disposed on the upper side of the shape-retaining material (1) is composed of wire rods having different aspect ratios, and the short dimension side is a plane formed by the upper surface of the shape-retaining material (1). Along state,
That is, when arranged in a vertically long state, the amount of bending with respect to the pressing force from the direction orthogonal to the circular plane becomes small.
On the other hand, the deformation in which the distance between adjacent ones of the spirally arranged metal wire rods (2) is changed is difficult because the both ends of the arc are fixed. For this reason, since the deformation of the metal wire (2) as a whole is small, even if the pitch of the spiral is set to the reference dimension, the deformation of the metal wire causes foreign matter to enter the fan rotation region.

In the above-mentioned embodiment, the wire rod having an oval cross section is arranged in a spiral shape, but the metal wire rod having a rhombic cross section may be arranged in a spiral shape in a vertically long state. Further, in the above-described embodiment, the fan guard having the circular outer shape has been described, but the fan guard having the rectangular outer shape and the wire rod formed in each spiral can be applied. Further, the central portion may be formed in a dish shape that also protrudes toward the outer peripheral edge.

[0014]

[Effect of the Invention] According to the present invention, metal wire rods having different aspect ratios are spirally arranged in a vertically long posture on the upper surface of the shape retention material arranged radially, and the contact portion between the metal wire material and the shape retention material is fixed by welding. Therefore, it is difficult to bend against the pressing force from the front surface of the fangart, and it is possible to prevent the distance between the adjacent wire rods from being widened due to the deformation. can do. As a result, the number of welding points is reduced, so that the manufacturing cost can be reduced.

By widening the arrangement pitch, the opening area can be widened, the ventilation resistance can be reduced and the cooling efficiency as a heat exchanger can be improved, and the noise due to wind noise can be reduced. You can

[Brief description of drawings]

FIG. 1 is a plan view showing an example of a fan guard.

FIG. 2 is a sectional view taken along line II-II in FIG.

[Explanation of symbols]

 1 ... Retaining material, 2 ... Metal wire material.

Claims (3)

[Scope of utility model registration request] 1. A fan guard in which a metal wire (2) is spirally arranged at a predetermined pitch on top of a shape-retaining material (1) that is radially arranged, and the metal wire (2) to be arranged on the shape-retaining material (1) is The metal wire rod (2) and the shape-retaining material are formed by arranging the deformed wire rod whose vertical dimension is larger than that in the horizontal direction, and disposing this metal wire rod (2) on the upper surface of the shape-retaining material (1) in a vertically long posture. A fan guard characterized by welding and fixing the contact part with (1). 2. The fan guard according to claim 1, wherein the metal wire rod (2) has a vertically long oval shape. 3. The fan guard according to claim 1, wherein the metal wire (2) is a vertically long rhombus.