JPH0243016Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application The present invention relates to a fan guard provided to surround a propeller fan for blowing air from the viewpoint of safety in an air conditioner. Used in harmonizers, small refrigerator/freezer units, etc.

2. Description of the Related Art In FIGS. 4 to 6, a cabinet 1 constitutes the outer shell of an air conditioner, and a heat exchanger 3, an electric motor 4 for blowing air, and a propeller fan 5 are housed inside the cabinet. Further, an air suction grill 2 is provided on the back of the cabinet 1, while a fan guard 7 for safety purposes is attached to the front of the cabinet to protect people from the rotating propeller fan 5. Note that the lower surface of the cabinet 1 is provided with legs 10 for supporting the air conditioner.

However, the propeller fan 5 is connected to the blower electric motor 4.
By rotating with more power, an air flow is created in which outside air is sucked into the cabinet 1 through the air intake grille 2, passes through the heat exchanger 3, and is discharged from the fan guard 7 to the outside. In this way, the air conditioner blows air.

Further, the propeller fan 5 is formed so that the diameter of the downstream side of the blade is enlarged, and the outer edge of the enlarged diameter part 13 of this blade is surrounded by a constant interval (indicated by dimension C). bell mouth 6 formed in
is installed. With this structure, the air flow, which was parallel to the axis of the fan up to the front of the propeller fan 5, is now caused to flow diagonally outward with respect to the axis of the fan. The direction changes and is discharged from the fan guard 7 to the outside.

The fan guard 7 is constituted by a large number of ring-shaped frames 8 having a circular cross-section in the fan axis direction and arranged concentrically. The arrangement of these ring-shaped frames 8 in the fan axis direction is such that at the outermost periphery of the fan guard 7, there is a slight distance from the front surface of the cabinet 1.
The distance from this point toward the center of the fan guard 7 gradually increases. As a result, the opening of the fan guard is arranged diagonally, and this inclination is determined to be approximately perpendicular to the flow of air discharged diagonally outward from the propeller fan 5.

That is, by arranging the frames at an angle like this, the gap dimension (opening area) B between the frames in the air flow direction is maximized (for example, it is larger than K in the case of vertical frame arrangement as shown in Fig. 7). , even if the frame pitch dimension A is the same, it is large (B>K), and the air resistance is minimized.

Also, the slanted fan guard opening
This diagonal opening is made large so that most of the air discharged from the propeller fan 5 flows, and in the remaining central opening Y, from the cabinet 1 in the diagonal portion X of the fan guard 7. A ring-shaped frame 8 is arranged at the farthest position so as to be orthogonal to the fan axis. These ring-shaped frames 8, as shown in FIG.
These radial aggregates 12 are connected by
At the center, it is connected to a wind shielding plate 9 in the shape of a truncated cone.

Problems that the invention aims to solve As mentioned above, in conventional air conditioners,
A large number of ring-shaped frames 8 forming the fan guard 7
is arranged diagonally so that the opening is approximately perpendicular to the air flow in order to minimize air resistance against the flow of air discharged diagonally outward from the propeller fan 5. part X of
is structured so that there are as many as possible. Therefore, as a result, although it is very effective in terms of performance such as noise and air volume, since the direction of air flow is tilted diagonally outward with respect to the fan axis, The opening X of the fan guard 7, which is made as large as possible so as to be approximately orthogonal to each other, is also inclined with respect to the fan axis. Because the distance to the tip (indicated by dimension H) increases, the fan guard protrudes greatly, which increases the overall depth of the air conditioner, which makes the air conditioner more difficult to operate. This was a factor that hindered thinning.

Therefore, the present invention is an air conditioner in which the depth dimension of the fan guard in the fan axis direction is reduced without worsening the influence of the fan guard on performance aspects such as noise and air volume.

Means for Solving the Problems The present invention provides a frame constituting a fan guard in an air conditioner, in which the cross-sectional shape in the fan axis direction of a portion of the frame perpendicular to the fan axis direction is parallel to the remaining 2
It is a parallelogram whose sides are approximately parallel to the flow direction of air discharged diagonally outward from the propeller fan.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3. In Figures 1 to 3, 4th to 6th
The same parts as those shown in the figures are given the same reference numerals, and detailed explanation thereof will be omitted.

According to this embodiment, the fan guard 1
1 is different from the conventional one, and this fan guard is attached to the front surface of the cabinet 1, and is constructed by arranging a large number of ring-shaped frames 8 and 14 of two types of different cross-sectional shapes on a concentric circle. There is.

These ring-shaped frames 8 and 14 are connected by aggregates 12 extending radially, and these radial aggregates 12 are connected at the center to a wind shield plate 9 in the shape of a truncated cone.

Regarding the arrangement of the ring-shaped frame constituting the fan guard 11 in the direction of the fan axis, the outermost periphery of the fan guard 11 is a short distance away from the front surface of the cabinet 1, and from there the central part of the fan guard They are arranged so that the distance gradually increases as one goes toward the other. As a result, the opening of the fan guard is arranged diagonally, and this inclination is approximately perpendicular to the flow direction of the air discharged diagonally outward from the propeller fan 5 (within 30 degrees to the orthogonal direction). It is decided to do so. The range of the oblique opening X is made smaller than that of the conventional example, and the oblique fan guard opening has a ring-shaped frame with a circular cross-section in the direction of the fan axis. 8.

On the other hand, the arrangement of the frame in the remaining inner part Y is such that the ring-shaped frame is arranged perpendicularly to the fan axis at the position farthest from the cabinet 1 of the diagonal opening X of the fan guard 11. The fan guard opening Y has a cross-sectional shape in the fan axis direction with two sides parallel to the fan axis direction, and the remaining two sides approximately parallel to the flow direction of the obliquely outer air discharged from the propeller fan 5. (Within 30° to the parallel direction) Parallelogram-shaped frame 1
4.

Next, its effect will be explained.

The gap between the ring-shaped frames of the fan guard in an air conditioner is determined by law in order to protect people from the rotating propeller fan 5, so this gap must be below a certain value. It is necessary to In FIGS. 2 and 6, the pitch dimension between the frames is indicated by A, and the gap dimension between these frames is indicated by B.

In addition, in order to minimize the air resistance against the flow of air discharged diagonally outward from the propeller fan 5 with respect to the fan axis, the opening of the fan guard should be As mentioned above, the more orthogonal the angle, the better. Here, in order to reduce the dimension of the fan guard in the fan axis direction, the dimension (depth) of the fan guard in the fan axis direction is made smaller than H shown in FIG. In order to make H>G), it is necessary to shorten the diagonal opening X of the fan guard 11 and increase the opening Y in the portion perpendicular to the fan axis accordingly. However, the fan guard opening Y in the part perpendicular to the fan axis
Since this is a portion that is not orthogonal to the air flow direction, a problem arises in that as this portion Y increases, air resistance also increases. Therefore, the present invention minimizes air resistance by improving the cross-sectional shape of the fan guard frame at the portion Y where the arrangement of the frame is not perpendicular to the air flow direction.
By making this improvement, it is possible to reduce the dimension (depth) of the fan guard in the fan axial direction, and the accompanying performance deterioration in air volume, noise, etc. can be kept to a minimum. That is, when the ring-shaped frame 8 having a circular cross section in the fan axis direction is arranged in the fan guard opening Y in the portion perpendicular to the fan axis described above,
(shown by a broken line in the figure), the pitch of the ring-shaped frame is A dimension, and the gap for the flow of air discharged diagonally outward from the propeller fan 5 is indicated by K dimension. On the other hand, in the cross section in the fan axis direction, two sides are parallel to the fan axis direction, and the remaining two sides are approximately parallel (parallel direction (within 30°), it is expressed by the J dimension. The relationship between the dimensions is B>J>K.

In this way, in the fan guard opening in the part perpendicular to the fan axis, by making the cross-sectional shape of the ring-shaped frame in the fan axis direction into the aforementioned parallelogram, the predetermined pitch dimension A of the frame can be adjusted. Since the gap size in the direction of air flow can be made largest at the beginning, the resistance of air passing through this can be kept small.

Effects of the invention As detailed above, according to the invention, even if the dimension of the fan guard in the fan axis direction (indicated by dimension G in Fig. 1) is made smaller than that of the conventional example, the air resistance increases accordingly. can be kept to a minimum, without sacrificing performance such as air volume or noise.
As the depth dimension of the fan guard becomes thinner, the depth dimension of the air conditioner as a whole can be made thinner.

[Brief explanation of the drawing]

Fig. 1 is a side cross-sectional view showing an example of the internal structure of an air conditioner according to the present invention, Fig. 2 is an enlarged detailed view of a portion of Fig. 1, Fig. 3 is an enlarged detailed view of a portion of Fig. 2, and Fig. 4 is an enlarged detailed view of a portion of Fig. 2.
The figure is a front view of a conventional air conditioner, Figure 5 is a side sectional view showing its internal structure, Figure 6 is an enlarged detailed view of Figure 5, and Figure 7 is a fan guard frame attached to the fan shaft. FIG. 4 is a diagram showing the gap size between frames when they are arranged perpendicularly to each other. 1... Cabinet, 2... Air suction grill, 3... Heat exchanger, 5... Propeller fan, 6
... Bell mouth, 8 ... Frame, 9 ... Wind shield, 11
... Fun guard, 12 ... Aggregate, 14 ... Frame.

Claims (1)

[Scope of utility model registration request] In an air conditioner equipped with an air blower that blows air diagonally outward with respect to the center of the fan shaft, and a fan guard installed on the downstream side of the air discharged from the air blower, the frame constituting the fan guard may be The cross-sectional shape in the axial direction of the fan is a parallelogram with two sides parallel to the fan axial direction and the remaining two sides substantially parallel to the flow direction of the air discharged diagonally outward from the blower. An air conditioner fan guard featuring: