WO1998044299A1 - Outdoor unit of separate type air conditioner - Google Patents

Abstract

An outdoor unit of a separate type air conditioner having a propeller fan (2) disposed in a casing (1) and a blow grille (4) disposed on the output side of the propeller fan (2). The transfer grille (4) has a rectangular air outlet opening (8), and a plurality of blades (5) in parallel at prescribed spacings in the opening (8). On both sides of a plane (P) having a prescribed crossing angle (υ) in the revolving direction of the fan with respect to a straight line in the lengthwise direction of the blades (5) and passing the central axis of the fan (2), the inlet angle (αA) of a part (5A) of the blades (5) located in the area on one side (C1) of the plane (P) and the inlet angle (αB) in a part (5B) located in the area on the other side (C2) of the plane (P) differ from each other.

Description

 Specification

 Outdoor unit for air conditioner

Technical field

 The present invention relates to an outdoor unit for an air conditioner. More specifically, the present invention relates to an outdoor unit for an air conditioner having a propeller fan disposed in a casing and an outlet grill disposed on an outlet side of the propeller fan.

Background art

 FIG. 20 shows an outdoor unit Zo of a conventional general air conditioner. The outdoor unit ZQ includes a heat exchanger (not shown) and a propeller fan 22 inside a horizontally long rectangular casing 21, and blows out the propeller fan 22 from the casing 21. An outlet grill 25 is attached to the front opening 24 facing the side.

 By the way, the blowout grill in the outdoor unit is originally provided for the purpose of preventing danger caused by a rotating fan being touched by a person, and preventing damage to the fan caused by foreign substances entering the machine. However, in recent years, the design of the blowout grill itself has been improved more than the original purpose of installation, and the in-flight fan has been blindfolded from the diagonally upper outside to enhance the aesthetics of the outdoor unit as a whole. There is a tendency for the installation purpose to be more important from the viewpoint of changing the wind direction of the blown wind according to the setting of the outdoor unit.

 From this viewpoint, the outlet grill 25 adopts the following lattice shape. That is, the outlet grill 25 includes an outer frame 28 having a rectangular outlet opening 29 on the inside thereof, and a plurality of the outer grills 28 disposed in the outer frame 28 and arranged in parallel with each other at predetermined intervals in the vertical direction. Blades 26, 26,.

• and a plurality of supports connecting the blades 26, 26,. 2 7, 2 7 · · ·. In this case, as shown in FIGS. 21 and 22, the blade 26 is relatively wide and the propeller fan is designed to have a design, a blindfold function inside the machine, and a function of deflecting blown air. It has a cross-sectional shape that curves upward from the front edge 26 a closer to 22 to the rear edge 26 b of the outdoor side.

 However, the outdoor unit Zo having the lattice-shaped outlet grill 25 as described above has the following problems.

 That is, as shown in FIG. 20, when the propeller fan 22 rotates in the direction of arrow R (counterclockwise) to blow air, the air is sent from the propeller fan 22 to the outlet grill 25 side. The air flow is a counterclockwise swirling flow as shown by the white arrow in the figure.

 In this case, in the region on the left side of the propeller fan 22 in FIG. 20, air flows into the blades 26, 26,... Of the outlet grill 25 from above, and the propeller In the area on the right side of the fan 22, the airflow enters the blades 26, 26,... Of the blowout grill 25 from below. The flow states of the airflow to the blade group in each of these two regions are shown as airflow lines in FIGS. 21 and 22, respectively.

As shown in FIG. 21, when an airflow A having a downward velocity component flows into the blade 26, the airflow A is largely deflected upward by the blade 26, so that the blade 26 Separation of the air flow easily occurs on the lower surface side of 26 (that is, on the negative pressure side), and a large vortex is generated below each blade 26. Further, as shown in FIG. 22, when the airflow A having an upward velocity component flows into the blade 26, the airflow is separated on the upper surface side (that is, the negative pressure surface side) of the blade 26. Large eddies above each blade Become.

 As a result, the turbulence of the airflow blown from the blowout grill 25 becomes large, and the quiet operation of the outdoor unit is hindered by an increase in aerodynamic noise. Problems such as an increase in load occur.

 Therefore, a main object of the present invention is to provide an outdoor unit for an air conditioner that can realize a quiet operation and reduce a fan driving load by suppressing turbulence of an airflow in an outlet grille as much as possible. .

Disclosure of the invention

 The present invention employs the following configuration as specific means for solving such a problem.

 That is, the outdoor unit for an air conditioner of the present invention includes a casing, a propeller fan disposed in the casing, and an outlet grill disposed on an outlet side of the propeller fan. Is an outdoor unit for an air conditioner having a substantially rectangular outlet opening and a plurality of blades arranged parallel to each other at a predetermined interval in the outlet opening, wherein a straight line in a longitudinal direction of the blade is provided. A predetermined crossing angle in the direction of rotation of the fan with respect to the plane passing through the central axis of the fan as a boundary. It is characterized in that the entrance angle of the portion located on the other side of the plane is different from the entrance angle.

In the present invention, the swirl flow from the propeller fan is defined by the inlet angle of a portion of the blade located on one side of the plane and the inlet angle of a portion of the blade located on the other side of the plane. Inflow direction. For example, in the area where the inflow direction of the swirling flow is downward, Sets the inlet angle of the portion of the blade located in that region upward, and sets the inlet angle of the portion of the blade located in that region downward in the region where the inflow direction of the swirling flow is upward. Thus, despite the fact that the airflow from the propeller fan is a swirling flow and the inflow direction of the airflow to each portion of the blade is different, the side of the blade that becomes a negative pressure surface with respect to the airflow. Separation of the airflow at the time is effectively suppressed. Therefore, the turbulence of the blowout airflow can be prevented as much as possible in the entire area of the blowout opening of the blowout grill. As a result, aerodynamic noise is reduced and quiet operation of the outdoor unit is realized. At the same time, the ventilation resistance in the outlet grill is reduced, and the fan drive load is reduced.

 Further, the outdoor unit for an air conditioner of one embodiment includes a chord length of a portion of the blade located on one side of the plane with respect to the plane, and the other of the plane of the blade. The chord lengths of the portions located in the side region are different from each other.

In the outdoor unit for an air conditioner of this embodiment, the chord length of a portion of the blade located on one side of the plane and the chord length of a portion of the blade located on the other side of the plane are described. Can correspond to the inflow direction of the swirling flow from the propeller fan and the blowout direction from the blowout grill, respectively. For example, in the case where the blowout direction from the blowout grill is set to the upward direction, in a region where the inflow direction of the swirling flow is downward, the chord length of the portion of the blade located in that region is set to be large, and thus is sufficiently set Deflecting action is ensured. Thus, the airflow flowing downward into the blade can be sufficiently deflected upward by the blade and blown out. On the other hand, in a region where the inflow direction of the swirling flow is upward, the chord length of the portion of the blade located in that region is set to be small so that the deflecting action on the inflow airflow is as much as possible. To be smaller. This allows the airflow that has flowed upward to the blade to pass through the blade and blow upward. If the direction of the blow-out from the blow-out grill is set to downward, left or right, the same can be said for each direction. As a result, although the airflow from the propeller fan is a swirling flow and the inflow direction of the airflow to each part of the blade is different, the side of the blade serving as a negative pressure surface with respect to the airflow is provided. Separation of the air current is effectively suppressed. Therefore, the turbulence of the blown air flow can be prevented as much as possible in the entire area of the blow opening of the blow grill. As a result, aerodynamic noise is reduced, the quieter operation of the outdoor unit is made possible, and ventilation resistance in the outlet grill is reduced, further reducing the fan drive load.

 Further, the outdoor unit for an air conditioner of one embodiment is characterized in that an intersection angle of the plane with respect to a straight line in a longitudinal direction of the blade is set in a range of 90 ° to 135 °. I do.

 The airflow blown out from the propeller fan as a swirling flow flows from the trailing edge of the propeller fan to the leading edge of the blade while rotating while flowing therebetween. Here, considering the turning angle of the rotation direction of the fan of the airflow from the trailing edge of the propeller fan to the leading edge of the blade, the outdoor unit for an air conditioner of this embodiment considers The plane substantially coincides with the boundary between the region where the swirling flow actually flows downward and the region where the swirling flow flows upward with respect to the blade leading edge. Therefore, the above-described effects of the present invention can be more reliably obtained.

Moreover, the outdoor unit for an air conditioner of one embodiment is characterized in that the shape of the rear edge of the plurality of blades facing the outside is the same in the entire area of the blowout grill. With the outdoor unit for an air conditioner of this embodiment, the above-described effects of the present invention can be obtained, and the aesthetic appearance when viewed from the outdoor side is improved. The improvement of the commercial value of the outdoor unit is expected as much as the aesthetics are improved. Further, the outdoor unit for an air conditioner of one embodiment is characterized in that the front edges of the plurality of blades have a saw-tooth shape.

 In the outdoor unit for an air conditioner of this embodiment, a large number of small-scale vertical vortices are generated from the valleys of the sawtooth at the leading edge of the blade, and an airflow having a large flow velocity at a position distant from the negative pressure surface of the blade. It can be drawn near the negative pressure surface. Therefore, even if the inlet angle or the chord length of the blade slightly deviates from the optimum value with respect to the inflow direction of the air flow at the leading edge of the blade, the separation of the air flow on the suction side of the blade is effective. Is suppressed. As a result, the above-described effects of the present invention can be more reliably obtained.

 Further, the outdoor unit for an air conditioner of one embodiment is characterized in that the sawtooth shape of the leading edge of the blade is formed of a plurality of tapered projections.

 In the outdoor unit for an air conditioner of this embodiment, a large number of small-scale vertical vortices are generated from the valleys of the tapered projections, and the airflow having a large flow velocity at a position distant from the suction surface of the blade is generated by the suction surface. Can be drawn to the vicinity. Therefore, even if the inlet angle or the chord length of the blade slightly deviates from the optimum value with respect to the direction of flow of the airflow at the leading edge of the blade, the separation of the airflow on the suction side of the blade can be effectively performed. Is suppressed. As a result, the above-described effects of the present invention can be more reliably obtained.

 Further, the outdoor unit for an air conditioner according to one embodiment is characterized in that the tapered projection has a regular cone shape having a top at a central portion in a thickness direction of a front edge of the blade.

In the outdoor unit for an air conditioner of this embodiment, The deviation from the optimum value of the inlet angle or the chord length of the blade with respect to the inflow direction of the air flow in any of the upper and lower directions can cope with the deviation. Therefore, the separation of the airflow on the negative pressure side of the blade is effectively and reliably suppressed, and the above-described effect of the present invention can be more reliably obtained.

 Further, the outdoor unit for an air conditioner of one embodiment has an oblique cone shape having a top portion at a position where the tapered projection is displaced in the inflow direction from a central portion in a thickness direction of a front edge of the blade. There is a feature.

 In the outdoor unit for an air conditioner of this embodiment, the tapered projections effectively and reliably suppress the separation of the airflow on the negative pressure surface side of the blade, and the above-described effect of the present invention is more reliably achieved. can get.

 The outdoor unit for an air conditioner of one embodiment is characterized in that the top of the tapered projection is rounded.

 In the outdoor unit for an air conditioner of this embodiment, the tapered projection is easier to manufacture and more secure in handling as compared with the case where the tapered projection has a pointed shape.

 In addition, the outdoor unit for an air conditioner of one embodiment has a height of the tapered protrusion.

H, where the chord length of the blade is L, the ratio (HZ L) is set in the range of 0.05 to 0.35.

 In this outdoor unit for an air conditioner, the tapered projections effectively and surely suppress the separation of the airflow on the negative pressure side of the blade, and the above-described effects of the present invention are more remarkable. Become.

 In addition, in the outdoor unit for an air conditioner of one embodiment, when the pitch between the tapered projections is S and the height of the tapered projections is H, the ratio (S / H) is 0. It is characterized by being set in the range of 5 to 1.5.

In the outdoor unit for an air conditioner of this embodiment, Separation of the airflow on the negative pressure side of the blade is effectively and reliably suppressed, and the above-described effect of the present invention is further remarkable.

 In addition, in the outdoor unit for an air conditioner of one embodiment, when the pitch between the tapered protrusions is S and the height of the tapered protrusions is H, the ratio (SZH) of 0.7 is obtained. To 1.3.

 In the outdoor unit for an air conditioner of this embodiment, the tapered projections effectively and surely suppress the separation of the airflow on the negative pressure side of the blade, and the above-mentioned effects of the present invention are more remarkable. Becomes

 In addition, the outdoor unit for an air conditioner of one embodiment is configured so that the mounting orientation of the blowout grill can be changed so that the longitudinal direction of the blade can be changed around the center axis of the fan. A casing and the outlet grill are formed.

 In the outdoor unit for an air conditioner of this embodiment, the mounting direction of the outlet grill is changed to change the longitudinal direction of the blade around the center axis of the fan, so that the outlet direction from the outlet grill is changed. Can be appropriately changed to upper blowing, lateral blowing, and the like. Therefore, installation of the outdoor unit is improved.

Also, the outdoor unit for an air conditioner of the present invention includes a casing, a propeller fan arranged in the casing, and an outlet grill arranged on the outlet side of the propeller fan. An outdoor unit for an air conditioner having a substantially square outlet opening and having a plurality of blades arranged in parallel with a predetermined interval in the outlet opening, the air conditioner outdoor unit having a longitudinal direction of the blade. On the other hand, a chord length of a portion of the blade located on one side of the plane with respect to the plane passing through the central axis of the fan and the plane of the blade with a predetermined intersection angle in the fan rotation direction. On the other side of The chord lengths of the portions located in the region are different from each other. In the outdoor unit for an air conditioner of the present invention, the chord length of a portion of the blade located in a region on the side of the plane and the chord length of a portion of the blade located in a region on the other side of the plane are described. Can be made to correspond to the inflow direction of the swirling flow from the propeller fan and the blowout direction from the blowout grill, respectively. For example, in the case where the blowout direction from the blowout grill is set to the upward direction, in a region where the inflow direction of the swirling flow is downward, the chord length of the portion of the blade located in that region is set to be large, and thus is sufficiently set Deflecting action is ensured. Thus, the airflow flowing downward into the blade can be sufficiently deflected upward by the blade and blown out. On the other hand, in a region where the inflow direction of the swirling flow is upward, the chord length of the portion of the blade located in that region is set to be small to minimize the deflecting effect on the inflow airflow. This allows the airflow that has flowed upward to the blade to pass through the blade and blow upward. If the direction of the blow-out from the blow-out grill is set to downward, left or right, the same can be said for each direction. As a result, although the airflow from the propeller fan is a swirling flow and the inflow direction of the airflow to each part of the blade is different, the side of the blade that becomes a negative pressure surface with respect to the airflow. Separation of the airflow at the time is effectively suppressed. Therefore, the turbulence of the blown air flow can be prevented as much as possible in the entire area of the blow opening of the blow grill. As a result, aerodynamic noise is reduced, and quiet operation of the outdoor unit is realized. At the same time, the ventilation resistance in the outlet grill is reduced, and the fan drive load is reduced.

 BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 shows an outdoor unit for an air conditioner according to a first embodiment of the present invention. It is a front view.

 FIG. 2 is a partial perspective view of a blade in the blowout grill shown in FIG. FIG. 3 is an enlarged sectional view taken along the line I--111 of FIG.

 FIG. 4 is an enlarged sectional view taken along the line IV-IV in FIG.

 FIG. 5 is a partial perspective view of a blade in a blowout grill provided in an outdoor unit for an air conditioner according to a second embodiment of the present invention.

 6 is an enlarged sectional view taken along line VI-VI of the blade group composed of the blades shown in FIG. 5, and FIG. 7 is an enlarged sectional view taken along line VII-VI of the blade group composed of the blades shown in FIG.

 FIG. 8 is a partial perspective view of a blade in an outlet grill provided in an outdoor unit for an air conditioner according to a third embodiment of the present invention.

9 Ah in IX- IX line enlarged cross-sectional view of the blade group comprising a blade shown in FIG. 8 ₀

 FIG. 10 is an enlarged cross-sectional view taken along the line III-III of a blade group including the blades shown in FIG.

 FIG. 11 is a partial perspective view of a blade in a blowout grill provided in an outdoor unit for an air conditioner according to a fourth embodiment of the present invention.

 FIG. 12 is an enlarged cross-sectional view taken along the line XII—XII of the blade group including the blades shown in FIG.

 FIG. 13 is an enlarged cross-sectional view taken along the line XIII—XI11 of the blade group including the blades shown in FIG.

 FIG. 14 is an enlarged view showing a saw-tooth structure of the blade shown in FIG.

Fig. 15 shows an outdoor unit equipped with the blowout grille with blades shown in Fig. 11. It is a noise characteristic figure of a bird.

 FIG. 16 is a noise characteristic diagram of an outdoor unit having the blowout grill with blades shown in FIG. 11.

 FIG. 17 is a diagram showing air volume-noise characteristics of each embodiment of the present invention in comparison with a conventional example.

 FIG. 18 is a cross-sectional view of a blade group in a blow-out daryl provided in an outdoor unit for an air conditioner according to a fifth embodiment of the present invention.

 FIG. 19 is a cross-sectional view of a blade group in an outlet grill provided in an outdoor unit for an air conditioner according to a fifth embodiment of the present invention.

 FIG. 20 is a front view of a conventional general outdoor unit.

 FIG. 21 is an enlarged sectional view taken along line XX—XX of FIG.

 FIG. 22 is an enlarged cross-sectional view taken along line XXI-XXI of FIG.

BEST MODE FOR CARRYING OUT THE INVENTION

 Hereinafter, the present invention will be specifically described based on some preferred embodiments.

 First, a first embodiment will be described with reference to FIGS.

 FIG. 1 shows an outdoor unit Z according to a first embodiment of the present invention. This outdoor unit Z has the same basic configuration as the above-mentioned conventional general outdoor unit, and has a casing 1 in which a square front opening 3 is provided. A propeller fan 2 and a heat exchanger (not shown) are arranged, and an outlet grill 4 is detachably attached to the front opening 3.

The outlet grill 4 has the following lattice shape. That is, the outlet grill 4 has an outer frame 7 having a substantially square outlet opening 8 inside. In this outer frame 7, a plurality of blades 5, Are arranged horizontally and in parallel with each other at predetermined intervals in the vertical direction, and a plurality of support bars 6 in which the plurality of blades 5, 5,. , 6, · · connected.

 As shown in FIGS. 2 to 4, each of the blades 5, 5,... Has a curved cross-sectional shape as a basic form and is mounted with its concave surface facing upward. In addition, as shown in FIG. 1, the outlet grill 4 can arbitrarily select an installation posture in which the blade 5 is oriented vertically, in addition to an installation orientation in which the blade 5 is oriented substantially horizontally. It has become. Therefore, in the mounting position shown in FIG. 1, the airflow blown out from the propeller fan 2 is changed upward by the above-mentioned respective blades 5, 5, and is blown out of the machine. When the blade 5 is oriented vertically and the concave surface of the blade 5 is directed to the propeller fan 2 and to the left, the airflow from the propeller fan 2 is blown out to the left side. become. By the way, the blades 5, 5,... Of the blowout grill 4 have a curved plate-shaped basic cross-sectional shape as described above. In this embodiment, in addition to the basic cross-sectional shape, The entrance angles of the blades 5, 5, ··· are made different according to the area division corresponding to the rotation direction of the propeller fan 2 and the longitudinal direction of each of the blades 5, 5, ···.

That is, in this embodiment, as shown in FIG. 1, assuming a plane P (represented by a straight line in FIG. 1) passing through the central axis of the propeller fan 2, The entire area inside the blow-out opening 8 is divided into _two areas Ci and C2 with the plane P as a boundary, and the intersection angle of the plane P with the straight line in the longitudinal direction of the blade 5 (the direction of rotation of the fan) 0 is set in the range of 0 = 90 ° to 135 ° (FIG. 1 exemplifies the case where the crossing angle is 0 = 135 °). This area division is such that the airflow blown out from the propeller fan 2 is a swirl flow along the fan rotation direction, and the swirl flow flows from the blade trailing edge of the propeller fan 2 to each blade 5, 5 of the blowout grill 4. 5, * · The amount of turning while reaching the leading edge side is considered. In the first blowing area obliquely below the plane P, the airflow flows downward to the blade 5 as shown by the white arrow A, while the second blowing area C ₂ obliquely above the plane P. In this case, the airflow flows upward into the blade 5 as shown by the white arrow A.

Therefore, as shown in FIG. 2, the blade 5 is moved in the first blowing area C! Divided into two parts of the second blade section 5 B located in the first blade portion 5 A and the second outlet area C ₂ is located in the inlet of the front edge 5 A a of the first blade portion 5 A The angle _αΑ and the entrance angle B of the leading edge _5Ba of the second blade portion _5B are different from each other. Specifically, this is as shown in FIGS. That is, the inlet angle aA of the leading edge 5Aa of the first blade portion 5A located in the first blowout region into which the airflow flows downward is set above the horizontal line corresponding to the inflow direction of the airflow, and the inlet The angle aA is made to match as much as possible with the inflow direction of the airflow. In contrast, below the horizontal line entrance angle B of the leading edge 5 B a second blade section 5 B is located in the second air region C ₂ airflow flows upward, in response to the inflow direction of the air flow Side, the inlet angle B is made to match as much as possible with the inflow direction of the air flow.

Although the inlet angles _A and B are different from each other between the first blade portion 5A and the second blade portion 5B as described above, the chord lengths L _A and LB are the same. The shapes of the edges 5Ab and 5Bb are also the same. As a result, the shape of the trailing edge of the blades 5, 5,... Is the same over the entire area of the blowout grill 4 (the blowout opening 8). As a result, the following specific effects can be obtained.

That is, the inlet angle aA of the first blade portion 5A and the inlet angle B of the second blade portion 5B correspond to the inflow direction of the swirling flow from the propeller fan 2, respectively. airflow from the a swirling flow despite the inflow direction of the air flow for each portion 5 a, 5 B of the blade 5 is in a different state, the first outlet region d, the second outlet area C ₂ In each case, the inflow direction of the air flow and the inlet angle A, _{αΒ of the} blade 5 match as much as possible, and the separation of the air flow on the side of the blade 5 on the side where the air flow is a negative pressure surface is effectively performed. Is suppressed. Therefore, the turbulence of the blown air flow can be prevented as much as possible in the entire area of the blow opening 8 of the blow grill 4. As a result, aerodynamic noise is reduced, and quiet operation of the outdoor unit 実 現 is realized. Further, the ventilation resistance in the blow grill 4 is reduced, and the fan driving load is reduced.

In the plurality of blades 5, 5, ♦, the entrance angles α ， and _Β are different from each other between the first blade portion 5 ブ レ ー ド and the second blade portion _5B , but the trailing edge Since the shapes of 5Ab and 5Bb are the same in the entire area of the outlet grill 4, the aesthetic appearance from the outdoor side is improved. The improvement of the commercial value of the outdoor unit is expected as much as the aesthetics are improved. Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 5 illustrates a blade 5 (represented by the same reference numeral for simplicity) provided in the above-mentioned blow-out grill 4 instead of the blade 5 in the first embodiment. Further, the blades 5, 5,. & The first first blade portion 5 A arranged in the blow-out area, 5 A, the ... a sectional shown in FIG. 6, the second blade arranged in the second outlet area C ₂ FIG. 7 shows a cross section of the parts 5B, 5B,. The remaining components of the outdoor unit Z are the same as those of the first embodiment. As shown in these figures, the blade 5 of the blow-out daryl 4 in this embodiment has a curved plate-like basic cross-sectional shape and an inlet angle between the first blade portion 5A and the second blade portion 5B. The chord lengths L _A and L _B are different between the first blade portion 5 Α and the second blade portion 5 B while Β is made the same. That is, while the chord length L _A of the first blade portion 5A located in the first blowing region is set to be long, the chord length L _B of the second blade portion 5B located in the second blowing region C ₂ is shortened. You have set.

 As a result, the following distinctive impeachment results can be obtained.

That is, the first blowing area C! In which the direction of flow of the airflow from the propeller fan 2 is downward. In the above, the long chord length L _A of the first blade portion 5A can secure a sufficient deflecting action on the airflow, and the airflow flowing downward into the blade 5 can be deflected upward and blown out. Can be. In the second outlet area C ₂ inflow direction of the air flow is upward can be reduced deflection effect on airflow by a short chord length L _B of the second blade section 5 B, against該Bu, single de 5 The airflow flowing upward can be directly blown upward from the blade.

 As a result, even though the airflow from the propeller fan 2 is a swirling flow and the flow directions of the airflow to the respective portions 5A and 5B of the blade 5 are different, the airflow of the blade 5 is different. Therefore, the separation of the airflow on the side that becomes the negative pressure surface is effectively suppressed. Therefore, the turbulence of the blown airflow can be prevented as much as possible in the entire area of the blowout opening 8 of the blowout grill 4. As a result, aerodynamic noise is reduced, quiet operation of the outdoor unit is realized, and ventilation resistance in the outlet grill is reduced, so that the fan drive load is reduced.

Next, a third embodiment will be described with reference to FIGS. FIG. 8 illustrates a blade 5 (represented by the same reference numeral for simplicity) provided on the blowing grille 4 in place of the blade 5 in the first embodiment. Further, the blades 5, 5, the first blade portion 5 A, 5 A arranged in the first outlet area C! Of ..., of ... a sectional shown in FIG. 9, first arranged in the second outlet area C ₂ FIG. 10 shows a cross section of the two blade portions 5B, 5B,. The remaining components of the outdoor unit Z are the same as those of the first embodiment.

As shown in these drawings, the blade 5 of the blowout grill 4 in this embodiment has the same basic cross-sectional shape of a curved plate between the first blade portion 5A and the second blade portion 5B. On the other hand, the inlet angles _Α and _αΒ between the first blade portion 5A and the second blade portion _5B are different from each other, and the chord lengths LA and LB are different from each other. That is, the first blade portion 5 shed entrance angle of the leading edge 5 A a of A _A to be positioned in the first outlet area C 1 where the airflow flows downward, for the upper side of the horizontal line corresponding to the inflow direction of the air flow, The inlet angle aA is made to match as much as possible the inflow direction of the air flow. On the other hand, the second blade portion 5 B of the front edge 5 B a an entrance angle alpha _beta, lower than the horizontal line corresponding to the inflow direction of the air flow is located in the second air region C ₂ airflow you flows upwardly In this case, the inlet angle a B is made to match the inflow direction of the air flow as much as possible. This and monitor, while setting the first chord length L _A of the first blade portion 5 A located in the blowout region C! Long, second blade portions 5 B is located in the second air region C ₂ Chord length L _B is set short.

As can be seen, in this embodiment, since the features of the blades of the first and second embodiments are combined, the operation and effect of the first embodiment and the operation and effect of the second embodiment can be simultaneously obtained. it can. Therefore, the outdoor unit can be operated more quietly and the fan drive load can be reduced. Is reduced.

 Next, a fourth embodiment will be described with reference to FIGS.

FIG. 11 exemplifies a blade 5 (represented by the same reference numeral for simplicity) provided on the outlet grill 4 instead of the blade 5 in the first embodiment. Further, the blades 5, 5, the first blade portion 5A, 5 A department parallel to the first outlet area C! Of ..., of ... a sectional shown in FIG. 12, first arranged in the second outlet area C ₂ FIG. 13 shows a cross section of the two blade portions 5B, 5B,. The remaining components of the outdoor unit Z are the same as those of the first embodiment.

 As shown in these figures, the blade 5 of the blowout grill 4 in this embodiment is obtained by adding constituent elements such as tapered projections 10, 10, to the basic structure of the blade 5 in the first embodiment. .

 The tapered projections 10 are formed on the leading edges 5Aa, 5Ba of the blade portions 5A, 5B of the blade 5 at a predetermined pitch in the longitudinal direction. In particular, the top of the tapered projection 10 in this embodiment is formed in a regular cone shape located substantially at the center in the thickness direction of the leading edges 5 &, 5Ba of the blades 5A, 58. The tapered projections 10, 10,... Are formed so that the leading edges 5Aa, 5Ba of the blade portions 5A, 5B are both formed in a sawtooth shape.

By providing such tapered protrusions 10, 10,..., When the airflow from the above-described probe fan 2 flows into the leading edges 5Aa and 5Ba of each blade 5, FIG. As shown by the streamlines, a large number of small-scale vertical vortices are generated from the valleys of the tapered projections 10, 10, ···, and the negative pressure surface of the blade 5 (in the first blade portion 5A). Is the lower flow rate, and the flow velocity is higher at a position away from the lower A flow can be drawn near the suction surface. Therefore, even if the inlet angle or chord length of the blade 5 is slightly deviated from the optimal value with respect to the inflow direction of the airflow at the blade leading edges 5Aa and 5Ba, the suction surface of the blade 5 Separation of the airflow on the side is effectively suppressed. As a result, the functions and effects of the above embodiments can be obtained more reliably.

 Also, in this case, since the tapered projection 10 has a regular cone shape, the optimum value of the entrance angle or the chord length of the blade 10 with respect to the inflow direction of the air flow at the blade leading edges 5Aa, 5Ba. It can respond to any deviation from the upper or lower direction, and the separation of the airflow on the negative pressure side of the blade 5 is effectively suppressed.

 By the way, in order to most effectively and surely obtain the specific operation and effect obtained by providing the above-described tapered projections 10, it is necessary to appropriately set the shape and the like of the tapered projections 10. The inventors have found such an appropriate shape through experiments.

 That is, as shown in FIG. 14, the chord length of the blade 5 is set, the height of the tapered projections 10 is H, and the pitch between the tapered projections 10, 10,. Here, first, the relative relationship between the height H of the tapered protrusion 10 and the chord length L of the blade 5 and the noise level (ie, one of the effects provided by the suppression of the separation of the airflow by the tapered protrusion 10). When the ratio (HZ L) is in the range of 0.05 to 0.35, as shown in the experimental data in Fig. 15, It was found that

Next, the relationship between the pitch S between the tapered protrusions 10, 10,... And the height H of the tapered protrusions 10 and the relationship between the noise level and the noise level were examined experimentally. As shown in the data, good results were obtained when these ratios (SZH) were in the range of 0.5 to 1.5, but the ratio (SZH) was 0.7 It has been found that a higher effect can be obtained when the content is limited to the range of ~ 1.3.

 FIG. 17 shows the air volume-noise characteristics of the above embodiments in comparison with the conventional example. In Fig. 17, 〇 indicates the characteristics of the conventional example (Figs. 20 to 22), △ indicates the characteristics of the conventional example using a blade provided with tapered protrusions 10, 10, ..., and indicates the first characteristic. The characteristics of the embodiment and 鲁 indicate the characteristics of the fourth embodiment, respectively. From the experimental data, it is understood that the quiet operation of the outdoor unit is realized by the present invention.

 Next, a fifth embodiment will be described with reference to FIGS.

Instead of the blades 5 in the first embodiment, in the fifth embodiment, the plurality of blades 5, 5,... Provided in the blowout grill 4 include first blades arranged in the first blowout region. part 5 a, 5 a, shows a · · section 18 shows the second outlet area C ₂ is located in the second blade portion 5 B, 5B, of ... in the sectional view of FIG. 19. The blade 5 of this embodiment corresponds to a modified example of the blade 5 of the fourth embodiment. That is, in the fourth embodiment, the plurality of tapered protrusions 10, 10,... Of the leading edges 5 Aa, 5 Ba of the blade 5 are formed in a regular cone shape. The plurality of tapered projections 10, 10,... Of the edges 5Aa and 5Ba are formed in an oblique cone shape. Specifically, the tops of the tapered protrusions 10, 10, are displaced more toward the inflow direction of the airflow toward the blade 5 than the center in the thickness direction of the leading edge 5Aa, 5Ba of the blade 5. It is formed in the position where it was.

Thus the tapered projections 10, 10, by the · · and Hasukiri shape, the first outlet region d, the inflow direction and the blade of the airflow from the propeller fan 2 in the second respective outlet region C ₂ entrance angle of 5 alpha _alpha, and a shed Β can be matched to the variable retroactively. At the same time, the suction surface of blade 5 An airflow having a large flow velocity at a position distant from the suction surface can be drawn to the vicinity of the negative pressure surface. As a synergistic effect between them, higher quiet operation becomes possible and further reduction of the fan drive load is achieved.

 In the fourth embodiment, the first blade portion 5A and the second blade portion 5B have the same chord length and taper to the leading edges 5Aa and 5Ba of the blade 5 having different entrance angles. Protrusions 10, 10, · · · were provided, but are not limited to these. For example, the leading edge 5Aa, 5Ba of the blade 5 having the same entrance angle between the first blade portion 5A and the second blade portion 5B and having different chord lengths has tapered protrusions 10, 10, · May be provided. In this case, quiet operation can be achieved and the fan drive load can be reduced.

 In the fourth and fifth embodiments, the top of the tapered projection 10 has a pointed shape. However, the shape is not limited to this, and the top of the tapered projection 10 may be rounded. When the top of the tapered projection 10 is rounded as described above, the tapered projection can be easily manufactured and high safety in handling is ensured as compared with the case where the tapered projection 10 is formed into a pointed shape.

 Also, instead of providing the leading edges 5Aa, 5Ba of the blade 5 with the sawtooth shape by providing the tapered projections 10, 10,... The leading edges 5Aa and 5Ba may be cut in a zigzag to form a sawtooth shape. In short, if the blade leading edges 5Aa and 5Ba have a sawtooth shape, an airflow having a large flow velocity at a position remote from the suction surface of the blade 5 can be drawn to the vicinity of the suction surface.

Industrial applications

 The outdoor unit for an air conditioner of the present invention can be suitably applied to an air conditioner, particularly to a separation type air conditioner having an indoor unit and an outdoor unit.

Claims

The scope of the claims  1. It has a casing (1), a propeller fan (2) placed in the casing (1), and an outlet grill (4) located on the outlet side of the propeller fan (2). An air conditioner having an outlet grill (4) having a substantially rectangular outlet opening (8) and having a plurality of blades (5) arranged in the outlet opening (8) in parallel at a predetermined interval from each other. At the outdoor unit, A predetermined angle of intersection (を) in the fan rotation direction with respect to the straight line in the longitudinal direction of the blade (5) is further defined by a plane (P) passing through the center axis of the fan (2). Of the part (5A) located in the area (d) on one side of the plane (P) above (<< _A ) and the area (C ₂ ) on the other side of the plane (P) of the blade (5) An outdoor unit for an air conditioner, characterized in that an inlet angle (α 位置) of a portion (5B) located at a position different from an inlet angle (α _Β ). 2. The outdoor unit for an air conditioner according to claim 1, wherein the blade (5) is located in a region (d) on one side of the plane (Ρ) with respect to the plane (Ρ). chord length (5A) (L _a) and the chord length of the other side region portions located (C ₂₎ (5 B) of the plane (P) of the blade (5) and (L _B) An outdoor unit for an air conditioner, wherein the air conditioners are different from each other.  3. In claim 1 or 2,  An outdoor unit for an air conditioner, wherein an intersection angle (Θ) of the plane (P) with respect to a straight line in a longitudinal direction of the blade (5) is set in a range of 90 ° to 135 °.  4. In Claim 1, 2 or 3, The shape of the trailing edge (5Ab, 5Bb) of the blades (5) facing outside An outdoor unit for an air conditioner, wherein the shape of the outdoor unit is the same in the entire area of the outlet grill (4).  5. In Claims 1, 2, 3 or 4,  An outdoor unit for an air conditioner, wherein a front edge (5Aa, 5Ba) of each of the plurality of blades (5) has a sawtooth shape.  6. In claim 5,  An outdoor unit for an air conditioner, wherein the sawtooth shape of the leading edge (5Aa, 5Ba) of the blade (5) comprises a plurality of tapered projections (10).  7. In claim 6,  The air conditioner according to claim 1, wherein the tapered projection (10) has a regular cone shape having a top at a center in a thickness direction of a front edge (5Aa, 5Ba) of the blade (5). Outdoor unit.  8. In claim 6,  The tapered projection (10) has an oblique cone shape having a top at a position deviated in the inflow direction from the center in the thickness direction of the leading edge (5Aa, 5Ba) of the blade (5). An outdoor unit for an air conditioner, characterized by:  9. In claims 6, 7 or 8,  An outdoor unit for an air conditioner, wherein a top of the tapered projection (10) is rounded.  10. In claims 6, 7, 8 or 9,  When the height of the tapered protrusion is H and the chord length of the blade (5) is L, the ratio (HZL) is set in the range of 0.05 to 0.35. Outdoor unit for air conditioners.  11. In claim 6, 7, 8, 9, or 10, When the pitch between the tapered protrusions is S and the height of the tapered protrusion is H, An outdoor unit for an air conditioner, wherein these ratios (SZH) are set in a range of 0.5 to 1.5.  12. In Claims 6, 7, 8, 9 or 10,  When the pitch between the tapered protrusions is S and the height of the tapered protrusions is H, the ratio (SZH) is set in the range of 0.7 to 1.3. Outdoor unit for harmonizer.  13. In Claims 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12,  The casing (1) and the casing (1) are arranged so that the mounting orientation of the blow grill (4) can be changed so that the longitudinal direction of the blade (5) can be changed around the center axis of the fan (2). An outdoor unit for an air conditioner, wherein the outdoor unit is formed with an outlet grill (4).  14. It has a casing (1), a propeller fan (2) arranged in the casing (1), and an outlet grill (4) arranged on the outlet side of the propeller fan (2). (4) is an air conditioner having a substantially square outlet opening (8) and having a plurality of blades (5) arranged in parallel with a predetermined interval in the outlet opening (8). At the outdoor unit, A predetermined crossing angle (Θ) in the fan rotation direction with respect to the longitudinal direction of the blade (5) is further bounded by a plane (P) passing through the center axis of the fan (2). chord length of one side of the region (d) to position portions of the planar (P) (5A) (L a) and the other side region of said plane (P) of the blade (5) (C ₂ An outdoor unit for an air conditioner, wherein the chord length (L _B ) of the portion (5 B) located in () is different from each other.