JP4767006B2 - Blower and air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blower that has flow losses and noises reduced and that has a grille with a bar cross-sectional shape that extends along the blow out flow of a propeller fan. <P>SOLUTION: In the blower, each side face, with a cross-sectional shape perpendicular to the longitudinal direction of the bar line of a grill covering an air outlet of the blower device, has a protruding shape, and side faces 7a, 7c facing in the turning direction of the propeller fan 2 are shaped have larger warpage more than those of side faces 7b, 7d facing a direction reverse to the turning direction of the propeller fan. <P>COPYRIGHT: (C)2007,JPO&amp;INPIT

Description

  The present invention relates to an air blower and an air conditioner in which the wind blown from a propeller fan installed inside a unit is located outside on the propeller fan blowout side and is discharged through a grill surrounding the propeller fan blowout for security reasons. Related to the machine.

In a grill installed on the propeller fan blow-out side in a conventional blower, noise generated when an air flow passes and noise generated there have been problems. In view of this, there is shown a shape in which the tip of the lattice shape of the blowout net is asymmetrical to aim at the separation of the flow with the angle of depression blown out from the impeller and the reduction of the friction loss (for example, see Patent Document 1). ).
Further, a shape in which the lattice shape is an airfoil and interference between the air flow and the lattice is suppressed (see, for example, Patent Document 2). In addition, a configuration in which the chord length and attachment pitch of the airfoil bar are adjusted is also shown (for example, see Patent Document 3). Moreover, the shape which bent the shape of the inflow side according to the flow in the cross-sectional shape is proposed (for example, refer patent document 4).

JP 2001-124369 A (page 3, FIG. 10) Japanese Patent No. 5-93531 (2nd page, FIG. 3) Japanese Patent Laid-Open No. 5-203197 (page 3, FIG. 1) JP-A-10-281499 (6th page, FIG. 2)

  Since the flow blown out from the propeller fan installed inside the unit flows out at an angle in the direction of fan rotation, the flow blown out from the impeller is separated in the vicinity of the front grille row, particularly in the downstream part of the row. It was easy to do and increased noise and flow loss.

  The present invention solves the above-mentioned conventional problems, and weakens the phenomenon that the flow blown out from the propeller fan is peeled off at the rows of the front grille, and is provided with a grill capable of realizing noise reduction and flow loss reduction. The purpose is to provide.

In order to solve the above problems, a blower according to the present invention covers a propeller fan provided inside a unit, a fan motor that drives the propeller fan, and a blowout port of the propeller fan inside the unit, and has a mesh shape. In the blower device in which the wind blown out from the propeller fan is sent out through the grill, a cross-sectional shape perpendicular to the longitudinal direction of the crosspieces Both side surfaces of the are convex shape,
The cross-sectional shape perpendicular to the longitudinal direction of the crosspiece is the straight line that connects the apex of the upstream portion and the downstream portion and the line that exists in the same cross section and intersects the straight line perpendicularly, and both ends intersect the side of the cross section. The propeller fan swivel direction is defined by a straight line connecting the vertices of the upstream portion and the downstream portion at a distance between the straight line and a straight line passing through the midpoint of the line segment and parallel to the straight line. The side surface facing the turning direction of the propeller fan without changing the cross-sectional width of the crosspiece by changing the distance in the direction facing the propeller fan so as to increase as the angle of attack of the wind blown from the propeller fan increases. Is larger than the side face of the propeller fan facing in the opposite direction of the turning direction.

  In the blower of the present invention, the flow blown out from the propeller fan installed in the unit is directed to the grille rows located in front of the fan, but is directed to the surface facing the fan turning direction in each row. Since the flow flows along the wall surface at the upstream portion of the lane, the flow is hardly separated. In the downstream part, the flow does not flow along the pier wall, so separation occurs.However, the flow toward the surface opposite to the fan's turning direction collides with the wall surface of the pier and the static pressure is reduced. As it rises, the force that presses the flow near the surface of the propeller fan facing the turning direction against the wall works. As a result, overall flow loss and noise can be suppressed. Moreover, since both sides are convex, it becomes easy to remove the mold during molding.

Embodiment 1 FIG.
Fig.1 (a) is the figure which looked at the air blower of this invention from the front, FIG.1 (b) is the figure which looked at the inside of the air blower from the top.
A propeller fan (axial fan) 2 and a fan motor 3 for driving the propeller fan (axial fan) 2 are installed inside the unit of the blower 1. When the propeller fan 2 operates, the wind is sucked from behind by the propeller fan 2 and sent forward. The wind flow is in the direction of the arrow 4 shown in FIG. In addition, a front grill 6 that covers the front outlet 5 is installed on the downstream side of the propeller fan 2. As shown in FIG. 1 (a), the front grille 6 has a mesh-like lattice shape with vertical and horizontal rows as viewed from the front.

2 is a front view of the front grill 6 according to Embodiment 1 of the present invention, FIG. 3 is an enlarged view of the AA cross section of FIG. 2, and FIG. 4 is an enlarged view of the BB cross section of FIG.
As shown in FIG. 2, the front grill 6 has rows of bars arranged vertically and horizontally. Of these, the vertical beam 7 with the larger number is the main beam, and the horizontal beam 8 with the smaller number is the sub beam. The present invention is mainly applied to a larger number of bars. Here, the shape (horizontal cross-sectional shape) of the cross section (for example, AA cross section) perpendicular | vertical to the longitudinal direction of a cross about two adjacent vertical rows 7 is demonstrated using FIG.

When the swirling direction of the propeller fan 2 at the same height and on the upstream side is denoted by reference numeral 9 in FIG. 3, for example, leftward, the flow of the wind from the propeller fan 2 toward the blowing beam 7 is AA in FIG. At the position, the velocity component in the axial direction and the velocity component in the turning direction are combined, so that the arrow direction indicated by 10 is obtained. The cross section of the cross 7 is divided into two by a straight line 12 connecting the upstream vertex 11a and the downstream vertex 11b, further intersects with the straight line 12 on the cross section, and both ends intersect at the side of the cross section and become the longest. The line segment 13 is divided into two. The outer shape of the crosspiece is divided into a total of four surfaces: surfaces 7a, 7c facing the rotation direction of the impeller and surfaces 7b, 7d opposite to the rotation direction of the impeller. Here, when the crosspieces 7a and 7b on the downstream side are compared, the curvature of 7a is larger than the curvature of 7b. Further, when comparing the upstream beam surfaces 7c and 7d, the curvature of 7c is larger than the curvature of 7d. Moreover, the vicinity where 7a and 7b intersect and the vicinity where 7c and 7d intersect are formed in an arc shape. Moreover, all the side surfaces of 7a, 7b, 7c, and 7d are convex curved surfaces.
Further, at the BB position in FIG. 2, as shown in FIG. 4, the turning direction of the propeller fan 2 is opposite to that in FIG. 3, so that the crosspieces 7 a and 7 b are centered on the propeller fan 2. The upper half and the lower half of the upper row 7 are reversed in opposite directions.

  In this example, the sub rail 8 that supports the main rail 7 is formed in a flat plate shape, and the width in the depth direction is not particularly limited and is arbitrary. Further, it is preferable that the thickness of the sub bar 8 is thin. Further, the vertical cross-sectional shape of the upstream end portion of the sub bar 8 may be an arc or a triangle. The lattice-shaped front grill 6 composed of the main beam 7 and the auxiliary beam 8 is formed by a resin mold, a metal die cast, or the like. When the number of sub-bars 8 is large, the cross-sectional shape (vertical cross-sectional shape) perpendicular to the longitudinal direction of the sub-bars 8 is determined as described above.

Next, the operation will be described by comparing the conventional grill and the grill of the present embodiment. FIG. 5 schematically shows the results of airflow analysis in the conventional grill (a) and the grill (b) of the present embodiment. In addition, illustration of the auxiliary crosspiece is omitted. The same applies to the following.
In the conventional grill, the air current blown out from the propeller fan 2 cannot flow along the wall surface in the vicinity of the crosspiece 7c, so it is separated, and a large vortex 14 is formed in the vicinity of the crosspiece 7a or at the rear of the crosspiece to increase the flow loss. Was invited. However, in the grill of this embodiment, the formation of a large vortex as in the conventional case is suppressed. Here's why. Since the wall surface of the crosspiece is in the shape of the flow direction in the vicinity of the crosspiece 7c in the upstream portion, the blown airflow flows smoothly, and separation at the upstream portion is difficult to occur. In the wake part, separation is suppressed by the cascade action with the adjacent crosspiece. That is, the flow blown out from the propeller fan 2 collides with the beam surfaces 7b and 7d to increase the static pressure, and a force due to the difference in static pressure is generated from the beam surface 7b toward the beam surface 7a of the adjacent beam. As a result, the flow and the vortex region near the crosspiece 7a can be pressed against the wall side of the 7a, and the separation region and the vortex region can be suppressed smaller than those of the conventional grill. Further, the vicinity of the upstream vertex 11a and the vicinity of the downstream vertex 11b are formed in an arc shape, so that the upstream flow is smoothly divided into the left and right to reduce the flow resistance, and the downstream is from the left and right of the rail. It also has the function of suppressing the vortex generation in the wake of the object (grill) by smoothly merging the flows.

  As described above, the warping direction is increased by increasing the warpage of the rail surfaces 7a and 7c facing the turning direction of the propeller fan of the main rail 7 and reducing the warping of the rail surfaces 7b and 7d facing the opposite direction of the turning direction. A wall surface along an obliquely inflowing flow can be formed at the upstream surface of the facing upstream portion, and separation can be suppressed by generating a force due to a pressure difference between adjacent downstream surfaces. As a result, as shown in FIG. 5C, for example, a conventional grill having a length of 10 mm, a width of 3 mm, and a pitch between adjacent bars of 11.3 mm, as shown in FIG. When the flow loss of the grill of the present embodiment of the width and pitch is estimated by the air flow analysis, when the inflow speed is 3 m / s and the tilt angle in the turning direction is 40 degrees, the upstream and downstream total pressure loss is 6.39 Pa for the conventional grill. On the other hand, the grill of this embodiment is 5.76 Pa, and it can be seen that the flow loss is reduced.

Embodiment 2. FIG.
What has been described in the first embodiment has shown the case where the upstream and downstream vertices can be specified in one place in the cross section (horizontal cross section) perpendicular to the longitudinal direction of the main beam 7. In this Embodiment 2, the case where the vertex of an upstream / downstream part cannot be specified is shown.

  FIG. 6 shows an example of a cross section in that case. The upstream portion and the downstream portion are flat surfaces (straight line 15a and straight line 15b). In this case, it is determined that the midpoint of the straight line is the vertices 16a and 16b and the left and right cross sections are separated by the straight line 12 connecting the two vertices 16a and 16b. Thereafter, the horizontal cross-sectional shape of the main beam 7 is determined in the same manner as in the first embodiment. Also in the second embodiment, there are substantially the same operations and effects as in the first embodiment.

Embodiment 3 FIG.
In the first and second embodiments described above, the cross-sectional shape perpendicular to the longitudinal direction of the beam is shown so that the separation of the flow is suppressed when the flow blown from the propeller fan obliquely flows into the main beam 7 It is. However, the direction of the flow of air flowing from the propeller fan into the grill differs depending on the blade shape of the propeller fan, the number of rotations of the fan, the distance between the fan and the grill, the position in the vertical and horizontal directions of the rows, and the like. Accordingly, FIG. 7 shows a horizontal cross-sectional shape perpendicular to the longitudinal direction of the main rail 7 so as to adapt to several kinds of inflow directions.

  As shown in FIG. 7, when the angle (attack angle 17) between the flow 10 flowing into the main beam 7 and the straight line 12 connecting the upstream and downstream apexes of the cross section is large, it intersects with the straight line 12 perpendicularly. The length of the line segment 13 where both ends meet at the side of the cross section is extended and the width of the cross section is widened to increase the warpage of the cross sections 7a and 7c. If it does so, the wall surface of the crosspiece 7c will come along with the flow 10 with a large angle of attack 17. Further, since the warpage of the wall surface of the crosspiece 7a is increased, vortices are hardly formed on the wake wall surface. The wall surfaces 7b and 7d can be kept substantially parallel to the straight line 12, and the effect of increasing the static pressure can be maintained on the 7b and 7d surfaces. By these, flow loss and noise can be suppressed.

  As described above, by increasing the warpage of the crosspieces 7a and 7c on one side of the main crosspiece 7, the crosspieces 7a and 7c are made to follow the flow even in a flow having a large angle of attack with respect to the crosspiece in the upstream portion. In the downstream portion, vortex formation is suppressed on the wake wall surface, so that separation hardly occurs, and a flow with small flow loss can be realized.

Embodiment 4 FIG.
In the third embodiment, the warp on one side is changed by expanding the width of the cross section. However, it is difficult to increase the width in terms of material cost reduction, and if it is too thick, the function as a resistance to flow increases. Therefore, in the fourth embodiment, FIGS. 8A and 8B show a method of changing the warp without changing the width.

  The straight line 12 is a straight line connecting the vertices on the upstream side and the downstream side as described above. The line segment 13 is a line segment that is perpendicular to the straight line 12 and whose end point is located on the side of the cross section and has the longest distance. The straight line 18 is parallel to the straight line 12 and passes through the midpoint 19 of the line segment 13. Here, with respect to the flow 10a flowing in at the angle of attack 17a, the straight line 12 and the straight line 18 are separated as shown in FIG. 8A, and the straight line 12 does not pass through the point 19 (cross-sectional shape). And For the flow 10b having a large angle of attack 17b, the distance between the straight line 12 and the straight line 18 is further increased as shown in FIG. 8B. Then, the curvature of the 7a and 7c surfaces can be increased, while the 7b and 7d surfaces approach a straight line parallel to the straight line 12. In this way, the flow loss can be reduced by the same effect as that shown in the third embodiment.

  As described above, it passes through the midpoint 19 of the longest line segment 13 which is parallel to the straight line 12 connecting the apexes of the cross section of the beam according to the angle of flow and perpendicular to the straight line 12 and having the side of the cross section as the end point. By changing the distance from the straight line 18, it is possible to change the warpage of both side surfaces while maintaining the width of the cross section. This makes it possible to create a shape with low flow loss even for a flow that flows in at a large angle of attack.

Embodiment 5 FIG.
A region divided into an upstream portion and a downstream portion with a line segment 13 of the cross section as a boundary will be described. Here, assuming the flow in the vicinity of the AA cross section of FIG. 2, as shown in FIG. 9, for example, the length of the crosspiece L = 10 mm and the crosspiece pitch of 11.3 mm are arranged side by side in the horizontal direction. The flow analysis was conducted at a speed of 10 m of 5 m / s and an angle of attack 17 of 40 degrees. As a condition, the length of the upstream portion of the three crosspieces is l, the total length of the crosspiece cross section is L, and the length ratio l / L between the upstream portion of the crosspiece and the full length of the crosspiece cross section is changed. The total pressure loss corresponding to the flow loss was investigated. FIG. 9B shows the result.

  As shown in FIG. 9B, when 1 / L is increased from 0.2, the total pressure loss shows a decreasing tendency, and 1 / L shows a minimum value in the vicinity of 0.3. When l / L exceeds 0.4, an increasing tendency is gradually exhibited. This is because, when l / L is small, the warping of the upstream portion becomes too large, and the separation at the upstream portion becomes large. On the other hand, if l / L becomes too large, the separation at the downstream portion becomes large, and the total pressure loss increases. Although the optimum l / L value varies depending on the angle of attack of the flow, if the ratio of l / L is roughly set in the range of 0.3 to 0.6, a flow loss reduction effect can be realized.

Embodiment 6 FIG.
The first to fifth embodiments described above relate to the cross-sectional shape of the main beam 7. Next, a sixth embodiment related to the arrangement of the cross-section of the front grill 6 will be described. The angle of attack at which the flow blown out from the propeller fan swirling in the direction of the arrow 9 flows into the crosspieces also varies depending on the position on the grill surface. Therefore, a crosspiece having a plurality of types of cross-sections is used rather than a single cross-section crosspiece. It is desirable to arrange and realize a flow loss reduction as a whole grill. Therefore, in the sixth embodiment, an example in which the cross-sectional shape is changed depending on the position on the grill surface will be described.

  FIG. 10A is a front grille 6 seen from the propeller fan side, and FIG. 10B is a view perpendicular to the longitudinal direction of the main beam of the grill at each grill point 20a, 20b, 20c in FIG. The figure which looked at the cross-sectional shape in the direction of the arrow is represented. Here, the crosspiece 7 having different cross sections depends on the angle 22 formed by the vector 21 obtained by projecting the main flow direction of the flow blown out from the propeller fan onto the crosspiece and the straight line 12 connecting the vertices of the upstream and downstream portions of the cross section. is set up. From the region 20a having a large angle 22 to the region 20c having a small angle, the warp difference between both side surfaces in the cross section is arranged from a large one to a small one. In this example, the crosspieces 7 having three different cross sections shown in FIG. 10B are arranged symmetrically around the center of the grill with the propeller fan as the center.

  When the cross section is arranged as described above, the difference in warpage between both sides becomes large at the portion where the angle of attack with respect to the cross is large, and the upstream shape becomes a shape along the flow. Moreover, since the pressure gradient between both side surfaces also becomes large, peeling is suppressed and flow loss is reduced. On the other hand, when the angle of attack with respect to the crosspiece is small, the side surface shape is symmetrical with respect to the straight line 12 and the blown flow flows straight along the side surface, thereby reducing flow loss and noise.

Embodiment 7 FIG.
In the sixth embodiment, the cross section is changed according to the angle 22 formed by the two vectors 21 and 12, but it is more manufactured by dividing the surface of the grill into a certain area than changing the cross sectional shape finely according to the inflow angle. Easy to top. Therefore, the cross-sectional shape in each region of the grill is changed according to the position in the circumferential direction 9 where the propeller fan turns.

  FIG. 11 (a) shows the grille viewed from the propeller fan side, and FIG. 11 (b) shows a cross-sectional shape perpendicular to the longitudinal direction of the grille rows at the grille points 23a, 23b and 23c in FIG. 11 (a). The figure seen in the direction of the arrow is shown. In FIG. 11, regions are divided by oblique dotted lines every 90 degrees in the turning direction, and the cross-sectional shape of the crosspieces in each region is shown. The upper region 23a has a large angle 22 formed by the vector 21 obtained by projecting the main flow direction of the flow blown from the propeller fan onto the cross section and the straight line 12 connecting the upstream and downstream vertices of the cross section. The one with the difference in the warpage of both sides in the cross section is arranged. Moreover, since the angle 22 with respect to a cross section is small in the area | region of right and left 23b, the cross section of the shape symmetrical with respect to the straight line 12 is selected. In the lower 23c region, since 23a and the top and bottom are in the opposite positions, a cross section having a shape opposite to the shape selected in 23a is formed and arranged.

  The angle of attack of the flow blown from the propeller fan depends on the position of the propeller fan in the turning direction. By separating the crosspieces 7 according to the angle in the swiveling direction, it is possible to divide the region according to the angle formed by the vector in the blowing flow direction and the cross-sectional major axis direction. Compared to the sixth embodiment, this can easily form a cross-sectional arrangement suitable for the blowing direction of the impeller, and can realize the suppression of peeling and the noise reduction effect.

Embodiment 8 FIG.
In the seventh embodiment, the shape of the cross section is changed by dividing the region in an oblique direction. However, if the grille rows are in the vertical and horizontal directions, the production becomes even easier if the areas are divided according to the row direction. Therefore, the arrangement of the cross sections when the areas are divided in the vertical and horizontal directions will be described.
FIG. 12 shows the crosspiece arrangement when the crosspieces are in the vertical and horizontal directions. FIG. 12A shows the grill viewed from the upstream side, and FIG. 12B shows the cross-sectional shape of the main beam of the grill at each grill point 24a, 24b, 24c in FIG. 12A in the direction of the arrow. Represents the figure. Here, the flow loss increases according to the magnitude of the blowing speed from the propeller fan. Therefore, the grill face is divided into a plurality of symmetrical areas as indicated by, for example, an H-shaped dotted line, by comparing the angle of attack to the crosspiece at a point where the radius of the blowout speed is high and the angle of attack. The upper and lower regions 24a and 24c in the H shape are the vector 21 in which the main flow direction of the flow blown from the propeller fan swirling in the direction 9 is projected onto the cross section, and the apexes of the upstream and downstream portions of the cross section. Since the angle 22 formed by the straight line 12 connecting the two is large, the one having a difference in warpage of both side surfaces of the cross section is disposed. Further, in the region 24b at the left and right end portions outside the H shape, the angle 22 with respect to the cross section is small, so a cross section having a symmetrical shape with respect to the straight line 12 is selected. In the lower 24c region in the H shape, 24a and the top and bottom are in the opposite positions, so that a cross section having a shape opposite to the shape selected in 24a is formed and arranged.

  With the cross-sectional arrangement as described above, the cross-section is not changed in the middle of the main beam in the vertical direction, and the manufacture becomes easier. Compared to Embodiments 7 and 8, the effect is small, but since the cross-sectional configuration is targeted at the region where the flow velocity is the fastest (which most affects flow loss and noise), it is also possible to achieve separation suppression and noise reduction effects. is there.

Embodiment 9 FIG.
The example which applied the air blower shown by the previous embodiment to the air conditioner is shown. FIG. 13 shows an example applied to an outdoor unit of an air conditioner. FIG. 13A is a front view of the outdoor unit, and FIG. 13B is a view of the interior of the outdoor unit as viewed from above.
Inside the outdoor unit of the air conditioner, there is a propeller fan 2 and a fan motor 3 that drives the fan. A heat exchanger 25 is disposed on the upstream side and side surface of the fan. Further, on the downstream side of the fan, a bell mouth 26 for sending a flow blown from the fan is attached to the blowout opening, and a grill 6 covering the blowout opening is attached. As the propeller fan 2 rotates, air is sucked in from the back surface of the heat exchanger 25, passes through the propeller fan and the outlet, and blows out from the grill 6 in front of the outlet. The flow of wind is indicated by arrow 27.

When the grill 6 having the above-described features is installed, the power loss of the system can be reduced because the flow loss is reduced. Further, in an air conditioner equipped with a conventional grill as shown in FIG. 13 (c), the flow 27c from the outlet spreads in the lateral direction and is sucked into the heat exchanger 25 on the side surface to deteriorate the heat exchange efficiency. . In the present invention, as shown in FIG. 13 (d), the main beam is set in the vertical direction, and for example, when the grill shown in FIG. 11 or 12 is attached, a region close to the side heat exchanger (23b in FIG. 11, 24b in FIG. ), The cross is symmetrical, so that the flow is rectified in the direction of the arrow 27d in FIG.
Thereby, it can prevent sucking into a side heat exchanger, can raise heat exchange efficiency, and can realize reduction of the input of the whole system.

Embodiment 10 FIG.
The cross section so far has a profile in which the side surfaces of the outer shape are surrounded by a continuous curve. However, a step 29 as shown in FIG. However, since this level difference is usually several percent with respect to the crosspiece width, there is little influence on the flow, and even when there is a level difference, a flow loss reduction effect can be obtained.

It is the schematic front view (a) of the air blower with which this invention was implemented, and the schematic top view (b) which looked at the inside of the air blower from the top. It is a front view of the front grille in Embodiment 1 of the present invention. It is detail drawing (AA sectional drawing of FIG. 2) of the cross-sectional shape of the main crosspiece in Embodiment 1 of this invention. It is BB sectional drawing of FIG. It is a schematic diagram of the flow around the crosspiece of the conventional grill and the flow around the crosspiece of the grill of the present invention. It is sectional drawing of the main crosspiece in Embodiment 2 of this invention. It is sectional drawing of the main crosspiece in Embodiment 3 of this invention. It is sectional drawing of the main crosspiece in Embodiment 4 of this invention. It is sectional drawing (a) of the main crosspiece in Embodiment 5 of this invention, and the graph (b) which showed the total pressure loss change when changing length ratio 1 / L. It is the layout (a) which shows the main cross-section position on the grill in Embodiment 6 of this invention, and the cross-sectional figure (b) of the main cross-piece in each position on a grill. It is the layout (a) which shows the main cross section position on the grill in Embodiment 7 of this invention, and the cross-sectional shape figure (b) of the main cross in each position on a grill. It is the layout (a) which shows the main cross-section position on the grill in Embodiment 8 of this invention, and the cross-sectional figure (b) of the main cross-piece in each position on a grill. It is the figure which showed the air conditioner in Embodiment 9 of this invention, (a) is a schematic front view of an air conditioner, (b) is the figure which looked at the inside of an air conditioner from the upper side, (c) is conventional. The figure which showed the mode of the flow of this air conditioner, (d) is the figure showing the mode of the flow at the time of attaching the grill of this invention. It is sectional drawing of the main crosspiece in Embodiment 10 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Air blower, 2 propeller fan, 3 fan motor, 4 Air flow which flows through an air blower, 5 Outlet, 6 Front grille, 7 Main beam, 7a, 7c Large warpage surface, 7b, 7d Small warpage surface, 8 Sub-row, 9 Propeller fan swivel direction, 10 Air current blown out from propeller fan, 11a, 11b Cross-section vertex, 12 Straight line connecting vertices 11a, 11b, 13 Longest line in the cross-section perpendicular to straight line 12 14 Vortex that can follow the crosspiece, 17 angle of attack, 18 straight line passing through point 19 parallel to straight line 12, 19 midpoint of straight line 13, 20a, 20b, 20c cross-sectional shape of crosspiece at each position of grille, 21 crosspiece A vector in which the mainstream direction toward the beam is projected onto the crosspiece, 22 an angle of attack of the vector 21 with respect to the crosspiece, 23a, 23b, 23c, a cross-sectional shape of the crosspiece at each position of the grill, 24a, 4b, the cross-sectional shape of the rail at each position 24c grill, 25 heat exchanger, 26 bellmouth, 27 airflow flowing inside the air conditioner.

Claims (7)

A propeller fan provided inside the unit, a fan motor for driving the propeller fan, and a grille configured to cover the outlet of the propeller fan inside the unit and configured by a plurality of mesh-like rows, In the air blower in which the wind blown out from the propeller fan is sent out through the grill, in the rows constituting the grill, both side surfaces of the cross-sectional shape perpendicular to the longitudinal direction of the rail are convex shapes,
The cross-sectional shape perpendicular to the longitudinal direction of the crosspiece is the straight line that connects the apex of the upstream portion and the downstream portion and the line that exists in the same cross section and intersects the straight line perpendicularly, and both ends intersect the side of the cross section. The propeller fan swivel direction is defined by a straight line connecting the vertices of the upstream portion and the downstream portion at a distance between the straight line and a straight line passing through the midpoint of the line segment and parallel to the straight line. The side surface facing the turning direction of the propeller fan without changing the cross-sectional width of the crosspiece by changing the distance in the direction facing the propeller fan so as to increase as the angle of attack of the wind blown from the propeller fan increases. An air blower characterized in that the warpage of the fan is larger than that of the side face of the propeller fan facing in the direction opposite to the turning direction.   2. The air blower according to claim 1, wherein the cross-sectional shape perpendicular to the longitudinal direction of the crosspiece is formed into a shape whose direction is reversed in the upper half portion and the lower half portion or the left half portion and the right half portion of the grill. apparatus.   The cross-sectional shape perpendicular to the longitudinal direction of the crosspiece is the straight line that connects the apex of the upstream portion and the downstream portion and the line that exists in the same cross section and intersects the straight line perpendicularly, and both ends intersect the side of the cross section. A side surface that is defined by a long line segment and that changes the width of the cross section according to the angle formed between the inflow direction of the airflow from the propeller fan and the straight line and faces the opposite side of the swirl direction of the propeller fan The air blower according to claim 1 or 2, wherein the shape is substantially parallel to the straight line.   When the cross-sectional shape perpendicular to the longitudinal direction of the crosspiece in the line segment is divided into an upstream part and a downstream part, l / L is 0.3 when the length of the upstream part is l and the total length of the cross section is L. The air blower according to claim 1 or 3, wherein the air blower is set to 0.6.   The shape of the cross section of the crosspiece is 2 by the angle formed by the vector formed by projecting the mainstream direction of the airflow passing through each position of the crosspiece onto the cross section of each crosspiece and the vector connecting the upstream and downstream vertices of the cross section. The blower according to any one of claims 1 to 4, wherein the blower is changed to more than one type.   6. The grill according to claim 1, wherein the surface of the grill is divided into a plurality of symmetrical areas, and a cross-sectional shape perpendicular to the longitudinal direction of the crosspiece is changed for each of the one area from the symmetry axis. The blower described.   An air conditioner comprising the air blower according to any one of claims 1 to 6.

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