CN1210503C - Blower, and outdoor unit for air conditioner - Google Patents

Abstract

By suppressing generation and growth of a blade tip vortex at that portion of a blade outer circumference which is not surrounded by a bellmouth, the noise (i.e., the operating sound), as might otherwise be generated when the blade tip vortex and a fan guard collide, is reduced. The setting is made so that H1/H0 = 0.40 to 0.65, where the height of the portion overlapping the outer circumference portion (P) of a blade (13) Out of the axial heights in the bellmouth (5) is designated by H1 and the axial height of the outer circumference portion (P) of the blade (13) is designated by H0. With this setting, the growth of the leakage current (i.e., the blade tip vortex) from the positive pressure face to the negative pressure face of the blade (13) is suppressed at that portion of the outer circumference portion (P) of the blade (13) which is not surrounded by the bellmouth (5), while keeping the suction flow from the outer circumference portion (P) of the blade (13).

Description

Outdoor units for air supply devices and air conditioners

technical field

The present invention relates to an air blower and an outdoor unit for an air conditioner.

Background technique

For example, in the case of an outdoor unit for an air conditioner, as shown in Figures 1-3, an air blower 3 is arranged on the downstream side of the heat exchanger 2 in the shell 1. The air blower 3 has the following parts: propeller type The blower 4 is formed with several (for example 3) blades 13, 13, 13 on the outer peripheral surface of the hub 14 which becomes the center of rotation; The blowing area Y is separated; the fan guard 6 is located on the blowing side of the above-mentioned propeller blower 4 . In the above-mentioned shell 1, a heat exchange chamber 8 and a mechanical chamber 9 are separated by a partition wall plate 7. In the above-mentioned heat exchange chamber 8, a heat exchanger 2 with an L-shaped cross-sectional shape and a heat exchanger located on the downstream side of the heat exchanger 2 are provided. The air blower 3 is a heat exchanger facing the air inlets 10 , 10 formed on the back surface and one side surface of the housing 1 , and a compressor 11 is provided in the machine room 9 . Symbol 12 is a fan motor.

In addition to the outdoor unit of the air conditioner with the above-mentioned structure, the air supply device 3 of the same structure (that is, having a propeller type blower 4 and being positioned at the outside of the propeller type blower 4, which will be sucked into the area) is also often used in ventilation fans, air cleaners, etc. The bell mouth 5 that is separated from the blowing area and the air blowing device that is positioned at the fan guard 6 on the blowing side of the above-mentioned propeller blower).

In the case of the air blower 3 of the above-mentioned structure, as shown in Figure 4, if the height _H1 of the overlapping portion with the outer peripheral portion P of the blade 13 of the propeller type blower fan 4 is the same as the outer peripheral portion of the blade 13 in the height of the bell mouth 5, Axial height H of P. When expressed as a ratio, H ₁ /H ₀ =0.25 to 0.40 is generally assumed, and air is sucked in from the front surface and the outer peripheral portion of the propeller blower 4 .

However, when the propeller blower 4 is in operation, as shown in FIGS. 5 and 6, the pressure difference between the positive pressure surface 13a and the negative pressure surface 13b of the blade 13 is large, and the outer peripheral portion not surrounded by the bell mouth 5, due to the pressure difference from the positive pressure surface 13a and the negative pressure surface 13b, The leakage flow W leaking from the pressure surface 13 a to the negative pressure surface 13 b generates a tip vortex E on the outer peripheral portion (that is, the blade tip) P of the blade 13 . This blade tip vortex E grows as it flows downstream as shown in FIG. 6a, 6a . Reference numeral 6b is a support rib 6b that supports the slats 6a, 6a. In addition, in FIG. 7 , the air streams indicated by dashed dotted lines occur at positions symmetrical to the air streams indicated by solid lines (that is, on the opposite side of the center of rotation), and are shown on the same cross-section for convenience of description.

In order to improve the aerodynamic performance of the propeller blower 4 , as shown in FIG. 8A , there are often thick-walled blade-shaped blades 13 represented by airfoil-shaped blades. In the case of a propeller blower having such thick-walled blade-shaped blades 13, the thickness shown in FIG. (For example, about 3 mm) blades 13 ′ in the shape of a thin plate can significantly improve air blowing performance and reduce noise compared to a propeller fan. That is, in the case of a thin-plate-shaped blade 13', as shown in FIG. 8B, even if the airflow turbulence e' peeled off occurs on the blade surface, the airflow turbulence e' at the trailing edge part B is also large, while in the thick-walled blade shape In the case of the blade 13, as shown in FIG. 8A, the peeling of the upper surface of the blade can be suppressed, and only the air flow turbulence e of the peeling is generated at the trailing edge part B, and the air blowing performance can be improved and the noise can be reduced.

However, in the case of the propeller blower 4 having the blade 13 of the above-mentioned thick-walled blade shape, the pressure difference between the positive pressure surface 13a and the negative pressure surface 13b of the blade 13 is larger than that of the blade 13' having a thin plate shape, so the bell mouth When the height of 5 is set in the range of H ₁ /H ₀ =0.25 to 0.40 as described above, the blade tip vortex E generated and grown on the outer peripheral portion (that is, the airfoil) P of the blade 13 has a ratio of The blade 13' of thin plate shape is larger. As a result, on the blowing side of the propeller blower 4, the noise generated by the fan guard 6 due to the collision of the blade tip vortex E with the fan guard 6 is larger than that of the blade 13' having a thin plate shape.

By making the blades into thick-walled blades, although the air blowing performance can be greatly improved and the noise can be reduced as a single fan, the fan guard will generate a lot of noise when assembled to the air blower and used. In recent years, by improving the shape of the blades and reducing the noise of the fan itself, the noise of the air supply device is compared with the noise of the propeller type blower, and the noise generated by the fan guard plays a major role. Therefore, how to reduce the noise generated by the fan protection device has become a major issue in the development of the blower device.

Contents of the invention

The invention of the present application was developed in view of the above-mentioned problems, and its purpose is to prevent the blade tip vortex and fan protection on the blowing side of the propeller blower by suppressing the generation and growth of the blade tip vortex in the part of the outer periphery of the blade that is not surrounded by the bell mouth. When the device collides, the noise generated by the collision (that is, operation sound) is reduced.

For this reason, the present invention provides a kind of blower device, and this blower device has the following parts: the propeller type blower fan that is formed with several blades of thick-walled blade shape on the outer peripheral surface of the hub that becomes the center of rotation; The bell mouth that separates the suction area from the blow-out area in the radial direction of the air blower; the fan guard located on the blowing side of the propeller type blower, the bell mouth is configured in such a way that it has a suction-side arc portion on the suction side And the blowing-side circular arc portion on the blowing-out side and the cylindrical portion between the blowing-side circular arc portion and the suction-side circular arc portion, wherein, assuming that the axial height of the bell mouth is the same as that of each When the height of the overlapping portion of the outer circumference of the blade is H ₁ , and the axial height of the outer circumference of each blade is H ₀ , the range of H ₁ /H ₀ =0.40˜0.65 is set.

By constituting as above, the suction air flow sucked in from the outer peripheral portion of the blade can be kept, and the leakage flow from the positive pressure surface of the blade to the negative pressure surface can be suppressed at the part of the outer peripheral portion of the blade that is not surrounded by the bell mouth (i.e. , blade tip vortex) growth. Therefore, when the blade tip vortex collides with the fan guard on the blowing-out side, the noise generated from the fan guard due to the collision can be reduced, greatly contributing to the muting of the running sound. In addition, when H ₁ /H ₀ <0.40, the growth area of the blade tip vortex (that is, the part of the outer periphery of the blade not surrounded by the bell mouth) is too large, and the interference noise between the blade tip vortex and the fan guard is large. , when H ₁ /H ₀ >0.65, the area on the suction side of the fan is excessively reduced, and the noise on the suction side increases due to the increase in the flow velocity. From the above reasons, it is preferable to set it within the range of H ₁ /H ₀ =0.40 to 0.65. By the way, the value of H ₁ /H is changed in various ways, and the product of the present invention (that is, the air blower of the propeller type blower equipped with several blades in the shape of thick-walled blades represented by airfoil blades) The wind noise was measured and the results shown in Figure 12 were obtained. It is also clear from this result that it is preferable to set it within the range of H ₁ /H ₀ =0.40 to 0.65. In addition, the dotted line in Fig. 12 shows the measurement results of the air blowing sound of the air blower equipped with a propeller blower having thin plate-shaped blades, and is shown in this figure for comparison with the product of the present invention.

In the air blower described above, when the cylindrical portion of the bell mouth is overlapped with the outer peripheral portion of each of the blades and the axial height of the cylindrical portion is H ₂ , H ₂ /H ₀ =0.25 to 0.50 is set. As a result, the cylindrical part of the bell mouth can suppress the growth of the leakage flow from the positive pressure surface of the blade to the negative pressure surface (that is, the blade tip vortex), but if the axial height of the cylindrical part H ₂ If the axial height H ₀ of the outer peripheral portion of the blade is too small (that is, when H ₂ /H ₀ <0.25), the growth area of the blade tip vortex (that is, the outer peripheral portion of the blade is not surrounded by the bell mouth cylinder The part surrounded by the upper part) is too large, the effect of the cylindrical part to restrain the growth of the blade tip vortex is not sufficient, and the interference noise between the blade tip vortex and the fan guard is large, if the axial height _H2 of the cylindrical part and the axial If the height H ₀ is too large (that is, when H ₂ /H ₀ >0.50), the radius of curvature of the arc portion on the suction side and the blowing side is too small, and air cannot flow in and out smoothly, resulting in turbulent flow to increase the noise. From the above reasons, it is preferable to set it within the range of H ₂ /H ₀ =0.25 to 0.50. By the way, the value of _H2 / _H0 is changed in various ways, and the product of the present invention (that is, the air supply device of the propeller type blower equipped with several blades in the shape of thick-walled blades represented by airfoil blades) ) The wind blowing sound was measured, and the results shown in Figure 13 were obtained. It is also clear from this result that it is preferable to set it within the range of H ₂ /H ₀ =0.25 to 0.50.

In the air blower described above, when the arc start position of the blowing-side arc portion of the bell mouth is substantially aligned with the position of the rear edge portion of each of the blades, the distance between the rear edge of the blade and the fan guard is only The distance is as large as the radius of the arc portion on the blowing side of the bell mouth, so the speed of the blowing wind is decelerated, and the airflow blown from the trailing edge of the blade will not leave the arc portion of the blowing side of the bell mouth, and expand smoothly to the outside until it reaches The fan guard will not generate turbulent flow and can reduce the speed of the fan, reducing the interference noise with the fan guard.

Furthermore, the present invention provides an outdoor unit for an air conditioner, which is equipped with an air blower having a portion in which thick airfoils typified by airfoil blades are formed on the outer peripheral surface of a hub that becomes the center of rotation. A propeller-type air blower with several blades in the shape of a wall blade; a bell mouth located on the radially outer side of the propeller-type air blower and separating the suction area from the blow-out area; a fan protection device located on the blow-out side of the propeller-type air blower, the The bell mouth is structured such that it has a suction-side arc portion on the suction side, a blow-out-side arc portion on the blow-out side, and a cylindrical portion between the blow-out side arc portion and the suction-side arc portion. , wherein, assuming that in the axial height of the bell mouth, the height of the overlapped portion with the outer peripheral portion of each blade is H ₁ , and when the axial height of the outer peripheral portion of each blade is H ₀ , set H ₁ /H ₀ = in the range of 0.40 to 0.65, and a heat exchanger is provided on the suction side of the blower. In this manner, an outdoor unit for an air conditioner with reduced operating sound can be obtained.

Description of drawings

Fig. 1 is a front view of a general outdoor unit for an air conditioner.

Fig. 2 is a sectional view of II-II in Fig. 1 .

Fig. 3 is a III-III sectional view of Fig. 1 .

Fig. 4 is a sectional view of a conventional propeller blower with bell mouth.

Fig. 5 is an enlarged perspective view of main parts showing a form of vortex formation at the blade tip of a conventional propeller fan with a bell mouth.

Fig. 6 is a cross-sectional view showing the formation state of the tip vortex of the propeller blower.

Fig. 7 is a partially enlarged cross-sectional view for explaining the state of interference between the airflow blown by the conventional propeller blower with a bell mouth and the fan guard.

FIG. 8A is an explanatory diagram showing the flow state of the airflow around the airfoil-shaped blade, and FIG. 8B is an explanatory diagram showing the flow state of the airflow around the thin plate-shaped blade.

Fig. 9A is a sectional view of an airfoil-shaped blade, and Fig. 9B to Fig. 9D are sectional views of three different shapes of an airfoil-shaped blade.

Fig. 10 is a cross-sectional view of a propeller-type air blower with a bell mouth used in an air blower according to an embodiment of the present invention.

Fig. 11 is an enlarged perspective view of main parts showing a state of vortex formation at the tip of a propeller blower with a bell mouth used in the blower device according to the embodiment of the present invention.

12 is a partially enlarged cross-sectional view for explaining the state of interference between the airflow blown from the propeller blower of the outdoor unit for an air conditioner using the blower device according to the embodiment of the present invention and the fan guard.

Fig. 13 is a diagram showing air blowing from a flared propeller blower (example) and a flared propeller blower (conventional example) having thin plate-shaped blades used in the blower device according to the embodiment of the present invention. Characteristic diagram of the variation of tone with respect to H ₁ /H ₀ .

Fig. 14 is a characteristic diagram showing changes in blowing sound with respect to H ₂ /H ₀ in a propeller blower with a bell mouth used in the blowing device according to the embodiment of the present invention.

Fig. 15 is a unit test diagram of a propeller-type air blower with a bell mouth used in the air blower according to the embodiment of the present invention.

Fig. 16 is a characteristic diagram showing changes in blowing sound with respect to H ₃ /H ₀ during a single test of a propeller-type blower with a bell mouth used in the blowing device according to an embodiment of the present invention.

17A to 17D are explanatory diagrams showing examples of changing the positional relationship between the blades of the propeller blower and the bell mouth.

Fig. 18 shows that the propeller type blower (comparative example) with the bell mouth shown in Fig. 16A and the propeller type blower (embodiment) with the bell mouth shown in Fig. 16D are relative to H ₁ /H Characteristic plot for a change of ₀ .

Detailed ways

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

This blower 3 is the same as the blower described in one of the prior art, and is used on the outdoor unit of an air conditioner shown in FIGS. 1 to 3. It is composed of the following parts: The outer periphery of the shaped hub 14 is formed with the propeller blower 4 of several (for example 3) blades 13, 13, 13; the bell mouth 5 that is positioned at the outside of the propeller blower 4 and separates the suction area X and the blowing area Y; The fan guard 6 located on the blowing side of the above-mentioned propeller blower 4 .

The above-mentioned outdoor unit for an air conditioner is constructed in such a way that the rectangular parallelepiped shell 1 is divided into a heat exchange chamber 8 and a machine chamber 9 with a partition wall 7, and a heat exchange chamber with an L-shaped cross-sectional shape is provided in the above-mentioned heat exchange chamber 8. 2 and the blower 3 located on the downstream side of the heat exchanger 2, the heat exchanger faces the air inlets 10, 10 formed on the back surface and one side of the housing 1, and in the machine room 9 There is a compressor 11 in it. Symbol 12 is a fan motor. As each blade 13 described above, a blade in the shape of an airfoil blade shown in FIG. 8A is used, but an airfoil blade in a shape similar thereto may be used.

The above-mentioned special-shaped airfoil-shaped blades include the blades shown in FIGS. 9B to 9D. The special-shaped airfoil blade shown in FIG. 9B has such a blade shape, that is, there is a bulging portion at the leading edge portion F, and the wall thickness becomes thinner sharply from the bulging portion. The thickness gradually becomes thinner, and the special-shaped airfoil-shaped blade shown in Figure 9C has such a blade shape, that is, there is a circular arc portion at the leading edge part F, and the wall thickness gradually becomes thinner as it approaches the rear edge part B, The special-shaped airfoil blade shown in FIG. 9D has such a blade shape, that is, it has a circular arc-shaped leading edge part F. As it approaches the rear edge part B, once the wall thickness becomes thicker, the wall thickness becomes thinner sharply. Thereafter, as it approaches the rear edge B, the wall thickness gradually becomes thinner. These profiled airfoil blades also have properties similar to those of the airfoil blades.

However, in the present embodiment, as shown in FIG. 10, the above-mentioned bell mouth 5 is structured such that it has a suction-side circular arc portion 5a on the suction side, a blow-out-side circular arc portion 5b on the blow-out side, and a In the cylindrical portion 5c between the blowing-side circular arc portion 5b and the suction-side circular arc portion 5a, the rear edge B of the propeller blower 4 is located at a position corresponding to the outer end of the cylindrical portion 5c of the bell mouth 5. (In other words, the arc start position of the outlet-side arc portion 5b of the bell mouth 5 is substantially aligned with the position of the rear edge portion B of the blade 13).

In addition, in this air blower 3, assuming that the height of the portion overlapping the outer peripheral portion P of the blade 13 among the axial heights of the bell mouth 5 is H ₁ , and the axial height of the outer peripheral portion P of the blade 13 is H ₀ , It is set in the range of H ₁ /H ₀ =0.40 to 0.65.

If it is set as above, as shown in FIGS. 11 and 12 , the suction air flow from the outer peripheral portion P of the blade 13 can be maintained, and the air flow can be suppressed at the outer peripheral portion P of the blade 13 and not surrounded by the bell mouth 5. Growth of a leakage flow from the positive pressure surface 13 a to the negative pressure surface 13 b of the blade 13 (that is, the blade tip vortex E). Compared with the cases of Fig. 5 and Fig. 7, the blade tip vortex E is significantly smaller. Therefore, when the blade tip vortex E collides with the fan guard 6 on the blow-out side, the noise generated by the fan guard 6 can be reduced due to the collision, greatly contributing to the muting of the running sound. In addition, when H ₁ /H ₀ <0.40, the growth region of the blade tip vortex E (that is, the part of the outer peripheral portion P of the blade 3 not surrounded by the bell mouth 5 ) is too large, and the blade tip vortex E The interference sound with the fan guard 6 is large, and if H ₁ /H ₀ >0.65, the area on the suction side of the fan is too small, and the noise on the suction side increases due to the increase of the flow velocity. For the reasons above, it is preferable to set H ₁ /H ₀ =0.40 to 0.65.

By the way, the value of H ₁ /H ₀ was varied, and the performance of the product of the present invention (i.e., a propeller-type blower equipped with thick-walled blades represented by airfoil-shaped blades) was measured. wind device), the result shown in the solid line in Figure 13 is obtained. From this result, it is also clear that it is preferable to set it in the range of H ₁ /H ₀ =0.40 to 0.65. In addition, the dotted line in Fig. 13 shows the measurement results of the blowing sound of the blower equipped with a propeller blower having several thin plate-shaped blades, and is shown in the figure for comparison with the product of the present invention.

As shown in FIG. 10, this air blower 3 overlaps the cylindrical portion 5c of the bell mouth 5 with the outer peripheral portion P of each of the above-mentioned blades 13, and assuming that the axial height of the above-mentioned cylindrical portion 5c is _H2 , it is set at H ₂ /H ₀ = in the range of 0.25 to 0.50.

When set as above, the cylindrical portion 5c of the bell mouth 5 can suppress the growth of the leakage flow from the positive pressure surface 13a of the blade 13 to the negative pressure surface 13b (that is, the blade tip vortex E), but the cylindrical portion If the axial height H ₂ of 5c is too small compared with the axial height H ₀ of the outer peripheral portion P of the blade 13 (that is, when H ₂ /H ₀ <0.25), the growth region of the blade tip vortex E (that is, the blade The portion of the outer peripheral portion P of 3 that is not surrounded by the cylindrical portion 5c of the bell mouth) is too large, the effect of inhibiting the growth of the blade tip vortex E caused by the cylindrical portion 5c is insufficient, and the difference between the blade tip vortex E and the fan guard 6 When the interference noise is large and the axial height H ₂ of the cylindrical portion 5c is too large compared with the axial height H ₀ of the outer peripheral portion P of the blade 13 (that is, when H ₂ /H ₀ >0.50), the fan suction side If the area is too small, the noise on the suction side will increase due to the increase of the flow rate. For the above reasons, it is preferable to set it in the range of H ₂ /H ₀ =0.25 to 0.50.

By the way, the value of H ₂ /H ₀ is changed in various ways, and the product of the present invention (that is, the air supply device of the propeller type blower equipped with several blades in the shape of thick-walled blades represented by airfoil blades) ) The wind blowing sound was measured, and the results shown in Figure 14 were obtained. From this result, it can be seen that it is preferable to set it in the range of H ₂ /H ₀ =0.25 to 0.50.

Carry out the monomer test of the propeller type air blower 4 with bell mouth used on the product of the present invention namely air blower 3 by following essentials.

That is, as shown in FIG. 15 , the fan motor 12 is fixed on the support stand 15 so that the propeller blower 4 with the bell mouth is arranged at a predetermined position, and the sound collecting microphone 16 is set on the blowing side of the propeller blower 4 . , the limit operation propeller type air blower 4, limit will run sound collection sound with sound collection microphone 16. After changing the ratio of the height H3 of the bell mouth ₅ to the axial height _H0 of the blade 13, the results shown in FIG. 16 were obtained.

According to this figure, it can be seen that in the case of a single fan, if the height H ₃ of the bell mouth 5 is reduced, the area surrounded by the bell mouth 5 of the blade 13 will be reduced (that is, H ₃ /H ₀ will be reduced), and the suction from the outer periphery of the blade 13 will be reduced. The suction volume increases, which reduces the supply air noise. It is generally believed that if the height _H3 of the bell mouth 5 is reduced, the area where the blade tip vortex is generated and developed increases, and the turbulent flow at the outer periphery of the blade 13 increases locally, so the wind blowing sound increases. However, as shown in Figure 16, In fact, the fan noise has been reduced. The reason is that i) when there is no fan guard on the blowing side, the air supply sound will not rise due to the interference sound of the blade tip vortex and the fan guard, and ii) the height of the bell mouth is lowered, and the outer peripheral area of the blade is more convenient. Expanding, the noise reduction effect increases due to the reduction and homogenization of the suction wind speed.

However, as in the embodiment, when the fan guard is provided on the blowing side, it cannot be said that the smaller the bell mouth is, the better, and there is an optimum position as described above.

Also, in this embodiment, the starting position of the arc of the blowing side arc portion 5b of the bell mouth 5 is substantially consistent with the position of the trailing edge portion B of each of the above-mentioned blades 13, so that the trailing edge of the blade 3 The distance between B and the fan guard 6 only leaves the radius corresponding to the blowing side arc portion 5b of the bell mouth 5, so the blowing out wind speed slows down, and the airflow W blown out from the trailing edge B of the blade 3 does not flow from the airflow W of the bell mouth 5. The arc portion 5b on the blowing side is peeled off and expanded outward smoothly until it reaches the fan guard 6 without turbulent flow and the speed is reduced, which can reduce the interference sound with the fan guard 6 .

For example, as shown in Figure 17A, in the case of the arc portion on the blowing side without the bell mouth 5, the blown airflow W quickly becomes an enlarged flow, generating turbulence e; In the case of a circular arc portion and the fan guard 6 is placed close to the trailing edge B of the blade 13, the interference sound between the blown airflow W and the fan guard 6 is large; as shown in FIG. When the tapered enlarged portion 5d is formed from the upstream side of the trailing edge B of 3, turbulence e is generated in the gap between the outer periphery of the blade 13 and the tapered enlarged portion 5d, so that the interference noise with the fan guard 6 increases. From the above reasons, as shown in FIG. 17D , it is better to make the arc start position of the outlet-side arc portion 5 b of the bell mouth 5 substantially coincide with the position of the rear edge portion B of each blade 13 described above.

Incidentally, as shown in FIG. 17A, in the case where there is no blowing-side arc portion of the bell mouth 5 (hereinafter referred to as a reference example) and as shown in FIG. 17D when the blowing-side arc portion 5b of the bell mouth 5 is In the case where the starting position of the arc is approximately the same as the position of the trailing edge B of each blade 13 (hereinafter referred to as the present embodiment), H ₁ /H ₀ was changed to measure the blowing sound, and the result shown in FIG. 18 was obtained. the results shown. It can be seen from the figure that the device of this embodiment is beneficial to reduce noise.

Possibility of industrial use

The present invention is used for an air blower that suppresses generation of blade tip vortices of a propeller type air blower to reduce operating noise, and an outdoor unit for an air conditioner using the air blower.

Claims (6)

1. blast device, this blast device has with the bottom: the propeller type gas fan (4) that is formed with several pieces blades (13) of heavy wall blade shape on the outer circumferential face that becomes the wheel hub of gyration center (14); Be positioned at the radial direction outside of this propeller type gas fan (4) and will suck regional (X) and blow out the horn mouth (5) that zone (Y) separates; Be positioned at the fan protector that blows out side (6) of described propeller type gas fan (4), described horn mouth (5) is to constitute like this, promptly have the suction side circular arc part (5a) that is positioned at the suction side and be positioned at and blow out blowing out side circular arc part (5b) and be positioned at this and blowing out cylindrical part (5c) between side circular arc part (5b) and the described suction side circular arc part (5a) of side, it is characterized in that, suppose that the height with peripheral part (P) lap described each blade (13) in the axial height of described horn mouth (5) is H ₁, the axial height of the peripheral part (P) of described each blade (13) is H ₀The time, set H ₁/ H ₀=0.40～0.65 scope.

2. blast device according to claim 1 is characterized in that, and is overlapping and suppose that the axial height of described cylindrical part (5c) is H at the peripheral part (P) of the cylindrical part that makes described horn mouth (5) (5c) and described each blade (13) ₂The time, set H ₂/ H ₀=0.25～0.50 scope.

3. blast device according to claim 1 and 2 is characterized in that, makes the circular arc initial position that blows out side circular arc part (5b) of described horn mouth (5) roughly consistent with the position of the hinder marginal part (B) of described each blade (13).

4. outdoor machine of air conditioner, it is equipped with a blast device (3), this blast device has with the bottom: the propeller type gas fan (4) of several pieces blades (13,13) that is formed with the airfoil blade heavy wall blade shape that is representative on the outer circumferential face that becomes the wheel hub of gyration center (14); Be positioned at the radial direction outside of this propeller type gas fan (4) and will suck regional (X) and blow out the horn mouth (5) that zone (Y) separates; Be positioned at the fan protector that blows out side (6) of described propeller type gas fan (4), described horn mouth (5) is to constitute like this, promptly have the suction side circular arc part (5a) that is positioned at the suction side and be positioned at and blow out blowing out side circular arc part (5b) and be positioned at this and blowing out cylindrical part (5c) between side circular arc part (5b) and the described suction side circular arc part (5a) of side, it is characterized in that, suppose that the height with peripheral part (P) lap described each blade (13) in the axial height of described horn mouth (5) is H ₁, the axial height of the peripheral part (P) of described each blade (13) is H ₀The time, set H ₁/ H ₀=0.40～0.65 scope, and be provided with heat exchanger (2) in the suction side of this blast device (3).

5. outdoor machine of air conditioner according to claim 4 is characterized in that, and is overlapping and suppose that the axial height of described cylindrical part (5c) is H at the peripheral part (P) of the cylindrical part that makes described horn mouth (5) (5c) and described each blade (13) ₂The time, set H ₂/ H ₀=0.25～0.50 scope.

6. according to claim 4 or 5 described outdoor machine of air conditioner, it is characterized in that, make the circular arc initial position that blows out side circular arc part (5b) of described horn mouth (5) roughly consistent with the position of the hinder marginal part (B) of described each blade (13).

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