CN110985445B

CN110985445B - Fan and outdoor unit equipped with same

Info

Publication number: CN110985445B
Application number: CN201911119029.0A
Authority: CN
Inventors: 木田琢己; 杉尾孝; 石曾根司; 盐谷优
Original assignee: Panasonic Intellectual Property Management Co Ltd
Current assignee: Panasonic Intellectual Property Management Co Ltd
Priority date: 2013-12-04
Filing date: 2014-12-02
Publication date: 2021-03-30
Anticipated expiration: 2034-12-02
Also published as: CN108708877B; CN110985445A; CN108708877A; WO2015083371A1; CN105793578A; CN105793578B

Abstract

The present invention provides a fan, including: a moving blade (5) comprising: a rotating hub (3) having a rotating shaft (2) and a plurality of rotating blades (4) provided around the rotating hub (3); and a stationary blade (8) which is provided on the discharge side of the moving blade (5) and has a stationary hub (6) and a plurality of stationary blades (7) provided around the stationary hub (6). In addition, the fixed blade (7) makes the installation angle of the fixed blade (7) closer to the outer periphery side than the central part larger than the blade installation angle of the fixed blade (7) closer to the fixed hub (6) than the central part in the radial direction according to the exhaust airflow of the movable blade (5) with the main flow concentrating to the outer periphery side than the central part of the rotating blade (4).

Description

Fan and outdoor unit equipped with same

The present application is a divisional application of patent application having application number 201810500041.5 and an invention name "blower and outdoor unit equipped with the blower", and 201810500041.5 is a divisional application of patent application having application date 2014, 12 months and 2 days, and having application number 201480066248.6 (international application number PCT/JP2014/006016) and an invention name "blower and outdoor unit equipped with the blower".

Technical Field

The present invention relates to a fan, and more particularly to a fan mounted on an outdoor unit of a refrigeration apparatus such as an air conditioner or a heat pump water heater.

Background

In recent years, in refrigeration apparatuses such as air conditioners, it has been required to reduce the input power of the equipment while energy saving is rapidly progressing as a measure against global warming. In addition, since the air conditioner is required to improve the heating comfort, the heat exchanger of the outdoor unit must have higher performance, and the fan mounted on the outdoor unit must have lower noise and higher wind volume.

In the related art, axial-flow fans or diagonal-flow fans have been used as fans of outdoor units in order to reduce noise and increase wind volume.

As a technique for reducing noise and increasing wind in such a fan, a static pressure recovery fin (static fin) for converting dynamic pressure energy having an air flow into static pressure energy and recovering the static pressure energy is provided on the downstream side of a propeller fan (fan) (see, for example, patent document 1).

Fig. 13 is a structural view showing an outdoor unit according to the related art. In fig. 13, the outdoor unit 101 includes: a propeller fan 105; a sealing ring (mouth ring)106 provided on the outer periphery of the propeller fan 105; and a static pressure recovery fin 107 provided on the discharge side of the propeller fan 105 and inside the seal ring 106.

Sealing ring 106 is positioned on the trailing edge side, which is the discharge side of propeller fan 105, and guides the blown air flow, and an enlarged discharge port 106a having a larger diameter than the front portion is formed in the rear portion of sealing ring 106. The static pressure recovery fin 107 is located downstream of the trailing edge of the propeller fan 105. The chord length of the static pressure recovery fin 107 is formed to increase from the center portion to the outer periphery.

In the outdoor unit configured as described above, the static pressure recovery fins 107 can increase the axial flow air volume by recovering the swirling flow that causes energy loss in the circumferential direction as static pressure. Further, the static pressure recovery vanes 107 can decelerate the swirling flow from the propeller fan 105, and thus noise can be reduced.

However, in the rotating blades (moving blades) of the fan such as the propeller fan 105 used in the outdoor unit and the like of the related art, the main flow concentrates on the radial direction position of the blades and is on the outer peripheral side of the substantial center, and therefore, the swirl direction component becomes large and the axial direction component also becomes large, and the inflow speed of the wake from the moving blades also becomes large.

Therefore, as in the prior art, there are the following problems: when the chord length of the static pressure recovery fin 107, which is a static vane, is increased from the center portion to the outer periphery, the loss due to the blade surface friction loss and the increase in the wake width of the wake increases.

Further, the influence of a leakage flow between the rotor blades of the propeller fan 105, which are moving blades, and a sealing ring 106 called a mouth (aperture), and a blade edge vortex generated at the blade edge of the moving blade also reaches the leading edge of the downstream static pressure recovery blade 107. The influence becomes larger particularly from the center of the stationary blade toward the outer peripheral end. Therefore, as in the prior art, there are the following problems: when the chord length of the outer peripheral end of the static pressure recovery fin 107 is large, the influence of the flow obstruction becomes large, and the swirl direction component cannot be efficiently recovered as the static pressure in accordance with the increase in the loss due to the turbulence.

In addition, in the rotary blades (moving blades) of the fan such as the propeller fan 105 used in the outdoor unit and the like of the related art, a horizontal portion exists at the front edge or the rear edge of the fixed blade depending on the attachment angle or the shape of the fixed blade such as the static pressure recovery blade 107. Such a horizontal portion has the following problems.

When a fan having a fixed blade is installed outdoors or in a freezing warehouse, for example, under ambient temperature conditions below freezing point such as in the winter season, when snow and frost deposited on the upper portion of the fan and its peripheral components are melted by sunlight, water droplets as snow melt water reach the fixed blade. Then, the water droplets accumulate in the horizontal portion of the fixed blade, and the water freezes again to grow into icicles. When the icicles grow upward from the leading edge of the fixed blade, there is a problem that the icicles interfere with the moving blade to generate abnormal noise, or the moving blade stops or is damaged. Such a problem is particularly problematic when a fan is installed in an apparatus such as an outdoor unit installed outdoors.

Further, in the rotary blades (moving blades) of the fan such as the propeller fan 105 used in the outdoor unit and the like of the related art, the rotary blades having the stationary blades on the downstream side of the moving blades have the following problems. That is, when the stationary blades and the blowout grid are strongly pressed toward the moving blades depending on the positions and shapes of the stationary blades, the stationary blades such as the static pressure recovery blades 107 of the stationary blades come into contact with the moving blades, and the moving blades or the stationary blades may be deformed or damaged.

The invention improves aerodynamic performance in an axial flow fan or a diagonal flow fan used in an outdoor unit of an air conditioner or a heat pump water heater to reduce noise and increase wind. Further, power saving and noise reduction are achieved by an outdoor unit having a fan mounted thereon.

In addition, the present invention prevents the generation of abnormal noise due to the generation and growth of ice and the stop and damage of moving blades in an axial flow fan or a diagonal flow fan used in an air conditioner, an outdoor unit of a heat pump water heater, or the like. In addition, in the outdoor unit equipped with the fan, the generation of abnormal noise caused by the generation and growth of ice and the stop and damage of the movable vane are prevented.

In addition, in the fan having the stationary blade on the downstream side of the low-dynamic-blade in the axial flow type or diagonal flow type fan, the stationary blade is prevented from contacting the dynamic blade when the stationary blade is strongly pressed toward the dynamic blade. In addition, in the outdoor unit equipped with the fan, the fixed blade is prevented from contacting the moving blade when the static blade and the blowing grid are strongly pressed toward the moving blade.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2000-130799

Disclosure of Invention

A fan of the present invention includes a moving blade and a stationary blade, wherein a stationary blade of the stationary blade is such that a blade attachment angle with respect to a plane perpendicular to a central axis, which is on the outer circumferential side of a central portion in the radial direction of the stationary blade, is larger than a blade attachment angle on the stationary hub side of the central portion.

With this configuration, the collision loss at the inlet of the stationary blade can be suppressed to a small level on the outer peripheral side of the central portion of the stationary blade, and the swirl direction component can be efficiently recovered as the static pressure.

Therefore, the aerodynamic performance of the fan of the invention is improved. In addition, the outdoor unit equipped with the fan of the present invention can save power and reduce noise.

The fan of the present invention includes a moving blade, a port, and a stationary blade, and the stationary blade of the stationary blade is disposed such that the axial position of the outer peripheral end of the leading edge, which is the edge on the suction side of the stationary blade, is located between the minimum diameter portion of the port and the discharge-side opening.

With this configuration, the air flow having a strong swirl component of the rotor blades flows between the blades of the stationary blades before turning into a radially expanding flow toward the discharge opening of the port, and is forcibly converted into an axial flow, so that the static pressure can be efficiently recovered.

The fan according to the present invention includes a moving blade and a stationary blade, and the stationary blade is configured such that the interval between stationary blades provided in a region where the leading edge, which is the edge on the suction side of the stationary blade, is located below the trailing edge, which is the edge on the discharge side, is greater than the interval between stationary blades provided in a region where the leading edge is located above the trailing edge.

According to this configuration, the horizontal portion where water droplets are likely to collect and become starting points of ice generation and growth can be reduced, and the swirling direction component can be efficiently recovered as the static pressure without generation of abnormal noise and stop and damage of the moving blades due to ice generation and growth.

Therefore, the blower of the present invention can prevent the generation and growth of ice. In addition, the outdoor unit with the fan of the invention has no problems of abnormal noise generation, stop of the movable vane and damage caused by ice generation and growth.

The fan of the present invention includes a movable blade and a stationary blade, the stationary blade has an annular support frame centered on a rotation axis on an outer periphery thereof, and the support frame and the mouth are fixed.

With this configuration, the stationary blade and the moving blade can be prevented from being deformed or damaged by coming into contact with each other when the stationary blade is strongly pressed toward the moving blade.

Therefore, the fan of the present invention can prevent the movable blade and the stationary blade from being deformed or damaged due to the contact between the stationary blade and the movable blade. In addition, the outdoor unit with the fan of the invention can prevent the movable blade and the fixed blade from deforming or breaking.

Drawings

Fig. 1 is a meridional cross-sectional view of a blower according to embodiment 1 of the present invention.

Fig. 2 is a front view of the fan of embodiment 1 of the present invention as viewed from the discharge side.

Fig. 3A is a cross-sectional view of 3A-3A of fig. 1.

Fig. 3B is a cross-sectional view of 3B-3B of fig. 1.

Fig. 3C is a cross-sectional view of 3C-3C of fig. 1.

Fig. 4 is an explanatory diagram showing a relationship between a radial position of a fixed blade and a blade attachment angle of a fan according to embodiment 1 of the present invention.

Fig. 5 is a perspective view of a main portion showing a connection portion between a fixed blade and a support frame according to embodiment 1 of the present invention.

Fig. 6 is a cross-sectional view of an outdoor unit loaded with a blower fan according to embodiment 1 of the present invention.

Fig. 7 is a longitudinal sectional view of another outdoor unit equipped with a fan according to embodiment 1 of the present invention.

Fig. 8 is a structural diagram of a fan according to embodiment 2 of the present invention.

Fig. 9 is a front view of the fan according to embodiment 2 of the present invention as viewed from the discharge side.

Fig. 10 is a front view of the blower fan according to embodiment 3 of the present invention as viewed from the discharge side.

Fig. 11 is a front view of the fan according to embodiment 4 of the present invention as viewed from the discharge side.

Fig. 12 is a front view of the fan according to embodiment 5 of the present invention as viewed from the discharge side.

Fig. 13 is a longitudinal sectional view of an outdoor unit of a related art air conditioner.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to these embodiments.

(embodiment 1)

Fig. 1 is a meridional cross-sectional view of a blower according to embodiment 1 of the present invention. Here, the meridional cross-sectional view is a cross-sectional view obtained by projecting the rotating blades 4 of the moving blades 5 and the fixed blades 7 of the stationary blades 8 onto a plane including the rotating shaft 2 of the moving blades 5 or the center axis of the stationary blades 8. Fig. 2 is a front view of the fan according to the present embodiment as viewed from the discharge side.

As shown in fig. 1 and 2, the fan 1 includes a moving blade 5, and the moving blade 5 includes: a rotary hub 3 attached to the rotary shaft 2; and 2 rotating blades 4 provided around the rotating hub 3. A stationary blade 8 is provided on the discharge side (downstream side) of the moving blade 5, and the stationary blade 8 includes: a stationary hub 6 located coaxially with the rotary hub 3; and 13 fixed blades 7 disposed around the fixed hub 6. Further, a port 9 is provided at a position on the outer periphery of the discharge side of the moving blade 5 and the outer periphery of the suction side (upstream side) of the stationary blade 8 with a predetermined gap between the moving blade 5 and the stationary blade 8.

The rotary shaft 2 is provided on the suction side of the rotor blade 5, and is connected to a drive shaft of a motor 10 that rotationally drives the rotor blade 5. Both the motor 10 and the mouth 9 are supported by a housing (not shown), and the relative positions of the movable vane 5 and the mouth 9 are adjusted and held. The fixed blade 7 is supported by a casing (not shown) via a support frame 11, and the relative position of the fixed blade 8 and the mouth 9 is adjusted and held. The support frame 11 is an annular member provided on the outer peripheral side of the stationary blade 8, and is formed integrally with the stationary blade 8.

The rotary hub 3 of the rotor blade 5 has a cylindrical shape or a truncated cone shape whose diameter increases toward the discharge side. The axial length of the rotor hub 3 is configured to be shorter than a meridional plane height (axial length when the rotor blades 4 of the rotor blades 5 are rotationally projected onto a plane including the rotating shaft 2 of the rotor blades 5) h1 at the center in the radial direction of the rotor blades 4.

The stationary vane 8 has a cylindrical shape at the fixed hub 6, and has an outer diameter equal to the diameter of the discharge-side end surface of the rotary hub 3, i.e., the diameter equal to the largest diameter of the rotary hub 3. The axial length of the fixed hub 6 is shorter than that of the rotating hub 3. The axial length of the stationary hub 6 is substantially the same as the meridional height h2 of the stationary blade 7 (axial length when the stationary blade 7 of the stationary blade 8 is rotationally projected on a plane including the center axis of the stationary blade 8).

The outer diameter of the stationary vanes 8 is larger than that of the movable vanes 5. That is, the length of the stationary blade 7 in the radial direction is configured to be longer than the length of the rotary blade 4 in the radial direction.

The mouth portion 9 has a minimum diameter portion 9 x. In the minimum diameter portion 9x, the clearance with the outer peripheral end of the rotor blade 4 of the rotor blade 5 is minimum. In fig. 1, the minimum diameter portion 9x is formed by a cylindrical surface including a linear portion extending in the axial direction at a constant diameter, but may be formed by a circumference having no constant diameter of the linear portion. The diameter of the port 9 increases from the minimum diameter portion 9x toward the discharge side, and a discharge-side opening 9y is formed at the end of the discharge side. The diameter of the port 9 also increases from the minimum diameter portion 9x toward the suction side, and a suction-side opening 9z is formed at the end of the suction side.

In the rotor blade 5, the position in the axial direction is adjusted so that the outer peripheral end of the trailing edge, which is the discharge-side edge of the rotor blade 4, faces the minimum diameter portion 9x of the mouth portion 9. Further, in the rotor blade 5, the position in the axial direction is adjusted so that the end portion on the discharge side of the rotary hub 3 faces the minimum diameter portion 9x of the port 9 or is positioned between the minimum diameter portion 9x of the port 9 and the discharge-side opening 9 y.

In the stationary blade 8, the position in the axial direction is adjusted so that the edge of the stationary blade 7 on the suction side, that is, the outer peripheral end of the leading edge is positioned between the minimum diameter portion 9x of the port 9 and the discharge-side opening 9 y. The stationary blade 8 is provided so as to form a predetermined gap S between the outer peripheral end of the stationary blade 7 on the leading edge side and the mouth 9. The outer diameter of the stationary blade 8 is larger than the outer diameter of the moving blade 5, and the diameter of the mouth 9 is enlarged toward the discharge side, so that the clearance S is substantially the same as the clearance between the outer peripheral end of the trailing edge of the rotor blade 4 of the moving blade 5 and the minimum diameter 9x of the mouth 9. Further, in the stationary blade 8, the position in the axial direction is adjusted so that the end portion of the stationary hub 6 on the suction side is positioned between the minimum diameter portion 9x of the port 9 and the discharge-side opening 9 y.

Here, the shape of the stationary blade 7 of the stationary blade 8 will be described in detail.

As shown in fig. 1, the meridian plane height h2 of the stationary blade 7 is substantially constant from the stationary hub-side end 7a, which is the end on the stationary hub 6 side, to the outer peripheral end 7 b. As shown in fig. 2, the leading edge of the fixed blade 7 is provided on a surface perpendicular to the rotating shaft 2 of the moving blade 5, inclined with respect to the radial direction so that the outer peripheral end 7b is positioned in the anti-rotation direction of the rotating blade 4 of the moving blade 5 with respect to the fixed hub-side end 7 a.

FIG. 3A is a cross-section of section 3A-3A of FIG. 1, the hub side cross-section. FIG. 3B is a cross section of 3B-3B in FIG. 1, which is a cross section on the outer peripheral side. Fig. 3C is a cross-section of 3C-3C, the outer peripheral end of fig. 1. Fig. 3A to 3C are views showing the cross-sectional shapes of the rotor blade 4 and the stationary blade 7 at the same radial position and the relationship between the airflow discharged from the rotor blade 5 and the blade attachment angle θ of the stationary blade 7. Here, the blade installation angle θ represents an angle with respect to a plane perpendicular to the rotation axis 2. Fig. 4 is a diagram showing a relationship between the radial position of the fixed vane 7 and the vane attachment angle θ.

As shown in fig. 3A to 3C, the rotary blade 4 has an arc-shaped or wing-shaped cross section that protrudes convexly in the counter-rotation direction of the rotor blade 5, and is fixed to the rotary hub 3 so as to be inclined with respect to the rotary shaft 2 such that the rotary blade trailing edge 4a is positioned on the discharge side. The stationary blade 7 has an arc-shaped or wing-shaped cross section that projects in the rotational direction of the moving blade 5, and is fixed to the stationary hub 6 at a blade attachment angle θ that is inclined with respect to a plane perpendicular to the center axis of the stationary hub 6, which is also the center axis of the stationary blade 8, so that the leading edge 7c is positioned on the suction side. Here, the blade attachment angle θ is an angle formed by a straight line connecting the leading edge 7c, which is the edge on the suction side, of the fixed blade 7 and the trailing edge 7d, which is the edge on the discharge side, and a horizontal plane perpendicular to the central axis of the fixed hub 6, and is an angle that increases from the horizontal plane perpendicular to the central axis of the fixed hub 6 toward the suction side or the anti-rotation direction side of the movable vane 5.

The blade attachment angle θ of the fixed blade 7 is configured to be different depending on the position of the fixed blade 7 in the radial direction.

As shown in fig. 3A and 4, the blade attachment angle θ a is smallest at the end (fixed hub-side end 7a) where the fixed blade 7 contacts the fixed hub 6. The blade attachment angle θ increases toward the outer circumferential side of the fixed blade 7 in the radial direction, and as shown in fig. 4, the blade attachment angle θ m is set at the center portion 7m of the fixed blade 7. As the blade attachment angle θ is further expanded toward the outer peripheral side than the central portion 7m, the distance between the central portion 7m and the outer peripheral end 7B of the fixed blade 7 becomes the largest (blade attachment angle θ B) as shown in fig. 3B and 4. The blade attachment angle θ is gradually smaller on the outer peripheral side than the position at which the blade attachment angle θ b is formed, and as shown in fig. 3C and 4, the blade attachment angle θ C is formed at the outer peripheral end 7b of the fixed blade 7. The blade attachment angle θ c is larger than the blade attachment angle θ a of the fixed hub-side end 7a and smaller than the blade attachment angle θ m of the central portion 7 m.

In other words, the blade attachment angles θ b and θ c on the outer peripheral side of the central portion 7m are larger than the blade attachment angle θ ab on the fixed hub 6 side of the central portion 7 m. Further, the blade attachment angle θ b is largest on the outer peripheral side of the central portion 7 m.

Since the meridional height of the fixed blade 7 is substantially constant regardless of the radial position and the blade attachment angle θ of the fixed blade 7 varies depending on the radial position, the curvature of the arc is smallest at the fixed hub-side end 7a of the fixed blade 7 that contacts the fixed hub 6 and largest at the center portion 7m and the outer peripheral end 7 b. The curvature of the arc of the fixed vane 7 at the outer peripheral end 7b is larger than the curvature of the arc at the fixed hub side end 7a and smaller than the curvature of the arc at the central portion 7 m. The curvature of the arc on the outer peripheral side of the central portion 7m is larger than the curvature of the arc on the fixed hub 6 side of the central portion 7 m.

Next, the shape of the connection portion between the fixed blade 7 and the support frame 11 of the stationary blade 8 will be described in detail. Fig. 5 is a perspective view of a main portion of the stationary blade 7 and the connecting portion of the support frame 11 of the stationary blade 8 as viewed from the trailing edge 7d side of the stationary blade 7. As shown in fig. 5, the outer peripheral end 7b of the fixed vane 7 is provided with a plate-like extension portion 12 that extends the fixed vane 7 in the radial direction only on the trailing edge 7d side of the fixed vane 7. One surface (a surface on the concave side in the fixed blade 7) of the extension portion 12 is formed with the same curvature as the concave side of the arc of the fixed blade 7, and the back surface is formed with a surface parallel to the central axis of the fixed hub 6. Therefore, the thickness of the extension 12 is the same as that of the fixed blade 7 at the extension rear edge 12a, but becomes thicker toward the extension front edge 12 b. The length of the extension portion 12 in the central axis direction (height in a meridian cross section) is formed shorter than the length of the leg portion 13 in the central axis direction, which will be described later. The height of the extension portion 12 in a meridional cross section is substantially constant regardless of the position in the radial direction.

On the other hand, the support frame 11 is provided with a leg portion 13 projecting toward the discharge side. The leg portion 13 is a plate-shaped member whose two surfaces are formed by surfaces parallel to the central axis of the fixed hub 6, and the thickness of the leg portion 13 is the same as that of the fixed blade 7. The length of the leg portion 13 in the central axis direction is formed to be shorter than the meridian plane height h2 of the fixed blade 7. As shown in fig. 1, the leg portion 13 is provided to support the fixed vane 7 at a position radially outward of the discharge-side opening 9y of the port 9.

Then, the outer circumferential end of the extension portion 12 is joined to the end of the leg portion 13 on the fixed hub 6, so that the front edge 7c of the fixed blade 7 is supported by the support frame 11 with a predetermined gap T formed between the front edge and the support frame 11. It is preferable that the fixed blade 7, the extension portion 12, the leg portion 13, and the support frame 11 are formed integrally, in terms of ensuring strength.

As shown in fig. 5, the blowing-side end 13a of the leg portion 13 is joined so as to be flush with the blowing-side extension rear edge 12a of the extension portion 12 and the rear edge 7d of the fixed blade 7. Therefore, the leading edge 7c of the fixed blade 7 protrudes further to the suction side than the support frame 11. The rear edge 7d of the fixed vane 7 projects further toward the discharge side than the support frame 11.

As shown in fig. 2, the length of the extension portion 12 connecting the fixed blade 7 and the support frame 11 (the length of the extension portion 12 in the radial direction) differs depending on the position where the fixed blade 7 is attached. The extension portions 12 of the fixed blades 7 positioned vertically and horizontally in the direction of gravity are short, and the extension portions of the fixed blades 7 positioned at other positions are long. With this configuration, sufficient strength for holding the stationary blade 8 to the support frame 11 can be easily ensured.

In the present embodiment, the fixed vane 7 of the stationary blade 8 is fixed to the mouth 9 or the housing by an annular support frame 11 provided on the outer periphery thereof and centered on the rotation axis. Therefore, even when the stationary blade 8 is pressed in the direction of the moving blade 5, or the like, a predetermined gap between the stationary blade 8 and the moving blade 5 can be maintained, and the stationary blade 7 of the stationary blade 8 can be prevented from contacting the rotor blade 4 of the moving blade 5 to deform or damage the moving blade 5 and the stationary blade 8.

In particular, in the present embodiment, the plurality of stationary blades 7 include the extension portion 12 and the leg portion 13 extending from the outer peripheral end of the extension portion 12 in the direction of the mouth portion 9, and are held by the mouth portion 9 or the housing via the extension portion 12 and the leg portion 13. Therefore, even when the stationary blade 8 is pressed in the direction of the moving blade 5 and displaced, the extended portion 12 and the leg portion 13 absorb the displacement, and the stopper blade 5 and the stationary blade 8 can be prevented from being deformed or damaged.

The operation and action of the fan configured as described above will be described below.

First, when the rotary shaft 2 is rotationally driven by the motor 10, the rotor blade 5 rotates counterclockwise as shown in fig. 2, and air is guided to the rotor blade 5 from the side where the motor 10 is disposed. At this time, dynamic pressure and static pressure are applied to the air by the plurality of rotary blades 4 and the mouth 9 provided around the rotary blades 4.

Then, the air (exhaust airflow) discharged from the driven fins 5 is guided to the stationary fins 8. As shown in fig. 3, the inflow velocity V of the air guided to the stationary blade 8 has an angle with respect to the axial direction of the rotary shaft 2, and has an axial flow direction component Va flowing in the axial direction and a swirl direction component Vt flowing in the rotational direction of the moving blade 5. The axial flow direction component Va is a velocity related to the air volume, but the swirl direction component Vt is perpendicular to the axial direction, i.e., a circumferential direction component, and therefore, the swirl direction component Vt is not related to the air volume, and only the stirring air becomes a loss energy when the turning cannot be smoothly performed in the axial direction.

Then, the swirl direction component of the exhaust gas flow of the moving vane 5 is reduced by the stationary vane 8 having the plurality of stationary vanes 7, and the swirl direction component (swirl flow) which becomes energy loss can be recovered as static pressure, whereby static pressure efficiency can be improved and an air blowing action can be achieved.

Here, the blade attachment angle θ b of the fixed blade 7 is larger on the outer circumferential side than the center portion 7m than the blade attachment angle θ a on the fixed hub 6 side than the center portion 7m, in accordance with the discharge airflow of the moving blade 5, the main flow of which is concentrated on the outer circumferential side than the center portion in the radial direction of the rotating blade 4. Therefore, in the region on the outer peripheral side of the center portion 7m where the swirl direction component at the inlet of the stationary blade 8 is larger than the region on the stationary hub 6 side of the center portion 7m, the collision loss at the inlet of the stationary blade 7 can be suppressed to be small, and the swirl velocity component can be efficiently recovered as the static pressure.

In addition, when the rotor blade 5 is of an axial flow type or a diagonal flow type, and only the discharge side of the rotor blade 4 of the rotor blade 5 is surrounded by the mouth 9, a large blade tip vortex is generated on the outer periphery of the rotor blade 4, and the discharge airflow velocity on the outer periphery side of the rotor blade 5 is significantly reduced. In particular, when a leakage flow is generated from the gap between the mouth 9 and the rotary blade 4 to the suction side by the influence of the vane edge vortex, the axial component of the exhaust gas flow is greatly reduced. However, in the present embodiment, the blade attachment angle θ between the central portion 7m and the outer peripheral end 7b of the fixed blade 7 is made maximum, and the blade attachment angle θ c at the outer peripheral end 7b of the fixed blade 7 is made smaller than the blade attachment angle θ m at the central portion 7m, so that the collision loss at the inlet of the fixed blade 7 at the outer peripheral end 7b of the fixed blade 7 of the stationary vane 8 can be suppressed to be small.

Therefore, the swirl velocity component can be efficiently recovered as the static pressure from the central portion 7m of the fixed blade 7 on the outer peripheral side, and the swirl velocity component can be efficiently recovered as the static pressure even at the outer peripheral end 7b of the fixed blade 7 which is easily affected by the leakage flow of the rotor blade 4 of the rotor blade 5 and the blade end vortex.

In the region of the portion where the blade attachment angle θ from the fixed hub side end 7a of the fixed blade 7 to the outer peripheral side is the largest, the blade attachment angle θ of the fixed blade 7, particularly the inlet angle, coincides with the discharge flow angle of the moving blade 5, so the swirl velocity component of the discharge flow of the moving blade 5 can be efficiently converted into the static pressure without increasing the chord length by increasing the meridian plane height h2 of the fixed blade 7.

Further, the chord length can be suppressed from extending as the distance from the outer circumferential side of the fixed blade 7 increases, and an increase in the loss due to the surface friction loss of the fixed blade 7 and the increase in the wake width of the wake can be suppressed.

When the blade attachment angle θ at the outer peripheral end 7b of the fixed blade 7 is smaller than the blade attachment angle θ in the region from the central portion 7m to the outer peripheral side, the leakage flow between the rotor blade 5 and the port 9 and the blade end vortex generated at the blade end of the rotor blade 5 are easily affected by a large variation in the angle of the exhaust flow from the outer peripheral end of the rotor blade 5. However, in the present embodiment, the meridional plane height h2 of the fixed blade 7 is set to be substantially constant from the fixed hub-side end 7a to the outer peripheral end 7b, and thus the meridional plane height can be suppressed from extending even in the vicinity of the outer peripheral end 7b of the fixed blade 7. Therefore, it is possible to efficiently recover the swirl component of the exhaust gas flow at the outer peripheral end 7b of the stationary blade 7 as the static pressure while suppressing the fluctuation of the flow, which becomes more influential when the chord length of the outer peripheral end 7b of the stationary blade 7 of the stationary vane 8 is large, and suppressing the increase in loss due to turbulence.

Further, by providing the fixed blades 7 on a plane perpendicular to the rotating shaft 2 of the moving blade 5 with the outer peripheral side inclined with respect to the hub side in the counter-rotating direction of the moving blade 5, the discharged airflow of the moving blade 5 passes through at different timings depending on the position in the radial direction of the fixed blades 7. Therefore, the noise generated when the exhaust airflow passes through the stationary blades 7 can be offset, and the magnitude of the noise generated when the exhaust airflow passes through the stationary vanes 8 can be reduced.

Further, a predetermined gap between the outer peripheral end of the rotor blade 4 of the rotor blade 5 and the port 9 is enlarged from the minimum diameter portion 9x toward the discharge-side opening 9y, and the outer peripheral end of the leading edge of the stationary blade 7 of the stationary blade 8 is positioned in the axial direction between the minimum diameter portion 9x of the port 9 and the discharge-side opening 9 y. With this configuration, the discharge airflow having a large swirl direction component in the region from the outer peripheral side to the outer peripheral end of the driven vane 5 can be made to flow into the inter-vane space of the fixed vane 7 before turning into the airflow (airflow having a radial direction component) that expands in the radial direction as it goes to the discharge-side opening 9 y. Therefore, the exhaust gas flow having a large swirl direction component can be forcibly converted into an axial direction component, and can be effectively recovered as the static pressure.

When all the airflows having strong swirl direction components near the outer peripheral end 7b of the stationary blade 7 of the stationary blade 8 are forcibly converted into axial direction components, a contraction flow is generated between the airflow on the trailing edge 7d side near the outer peripheral end 7b of the stationary blade 7 and the airflow from the outer peripheral side of the stationary blade 8, and an airflow that is not converted into static pressure is generated on the trailing edge 7d side near the outer peripheral end 7b of the stationary blade 7. However, in the present embodiment, since the predetermined gap S is provided between the outer peripheral end of the stationary blade 7 on the leading edge 7c side of the stationary blade 8 and the port 9, a leakage flow can be intentionally generated slightly from the pressure surface side to the suction surface side of the leading edge 7 c. This makes it difficult for contraction flow to occur on the trailing edge 7d side of the outer peripheral end 7b, and can be effectively recovered as static pressure. Further, a slight leakage flow from the pressure surface side to the negative pressure side in the gap S can smoothly decelerate along the enlarged discharge-side opening 9y on the discharge side of the port 9, so that the flow loss does not increase.

Further, the blade end vortex generated in the vicinity of the outer peripheral end of the rotary blade 4 flows downstream, and is disturbed when colliding with the extension 12 from the outer peripheral side of the fixed blade 7. However, in the present embodiment, the stationary blade 8 is fixed to the support frame 11 by the extension portion 12 extending only on the rear edge 7d side of the outer peripheral end 7b of the stationary blade 7, and the front edge 7c side of the stationary blade 7 is not fixed to the support frame 11. That is, the extension 12 is positioned on the trailing edge side of the fixed blade 7. Therefore, turbulence of the airflow at the extended portion 12 can be reduced on the front edge 7c side of the fixed blade 7.

Further, similarly to the action of the fixed vane 7 of the port 9, since the predetermined gap T is provided between the outer peripheral end of the fixed vane 7 on the leading edge 7c side of the fixed vane 7 of the fixed vane 8 and the support frame 11, a leakage flow can be intentionally generated slightly from the pressure surface side to the negative pressure surface side of the leading edge. This makes it difficult for contraction flow to occur on the trailing edge 7d side of the outer peripheral end 7b, and can be effectively recovered as static pressure. Further, a slight leakage flow from the pressure surface side of the gap T to the negative pressure side can smoothly decelerate along the discharge side opening 9y enlarged on the discharge side of the port 9, so that the flow loss does not increase.

Further, since one surface of the extension portion 12 is formed with the same curvature as the circular arc recess of the fixed vane 7 as shown in fig. 5, the flow of air on the rear edge 7d side of the fixed vane 7 is not disturbed as much as possible, and the static pressure can be recovered efficiently.

As described above, in the present embodiment, since the loss of the airflow due to the support when the stationary blade 8 is supported by the housing holding the mouth portion 9 can be reduced, the efficiency of the static pressure recovery at the stationary blade 8 can be suppressed as much as possible from being lowered.

Further, since the thickness of the extension portion 12 is the same as the thickness of the fixed blade 7 on the extension portion rear edge 12a side and becomes thicker toward the leading edge side, it is possible to match the direction of the airflow that largely changes in the airflow direction on the extension portion front edge 12b side of the extension portion 12, and it is possible to suppress the flow loss due to the separation as much as possible on the downstream side of the extension portion 12, and it is possible to secure the strength necessary for holding the fixed blade 7.

Further, since the fixed vane 7 is supported at a position in the radial direction on the outer peripheral side of the discharge-side opening 9y of the port 9, the leg portion 13 can be provided outside the airflow flowing along the discharge-side opening 9y of the port 9, and the resistance on the discharge side of the port 9 can be reduced.

Further, since the rear end of the fixed vane 7 is supported so as to protrude toward the outlet side with respect to the support frame 11, the leg portion 13 can be provided outside the air flow flowing along the outlet side opening 9y of the mouth 9, and the resistance on the outlet side of the mouth 9 can be reduced.

Hereinafter, an outdoor unit having the above fan mounted thereon will be described. Fig. 6 is a cross-sectional view of the outdoor unit with the fan mounted thereon of the present embodiment.

As shown in fig. 6, the outdoor unit includes a compressor 22, an outdoor heat exchanger 23, and the like in a casing 21 constituting an outer casing. The motor 10 is fixed to the casing 21 by a motor fixing member 24 fixed to a column at the bottom of the casing 21, and thereby the blower 1 is fixed to the casing 21 so that the discharge-side opening 9y of the mouth 9 coincides with the front surface 21a of the casing 21. The support frame 11 is fixed to the front face 21a of the casing 21, and the fan 1 is fixed to the casing 21.

Further, the blowout grill 25 is provided on the front surface portion 21a of the casing 21 so as to cover the stationary blade 8 protruding from the front surface portion 21a toward the front surface (discharge side). The blowing grille 25 is supported at a position on the outer peripheral side of the support frame 11. The blowing grille 25 may be held by the housing 21 or the support frame 11.

Such an outdoor unit is connected to an indoor unit of an air conditioner having an indoor heat exchanger and a unit of a heat pump water heater, thereby constituting a refrigeration cycle. Then, the air around the outdoor unit is sent to the outdoor heat exchanger 23 by the fan 1, and the refrigerant flowing through the heat transfer pipe of the outdoor heat exchanger 23 exchanges heat with the air by the operation of the compressor 22.

In the outdoor unit configured as described above, since the fixed blades 7 of the fixed blades 8 and the blowout grilles 25 are not directly fixed but fixed to the casing 21, even if an external force is applied to the blowout grilles 25 by dropping or artificial pressure from the front, the external force is absorbed to some extent by deformation of the front portion 21a of the casing 21, and there is no problem that the fixed blades 8 are deformed or the positional relationship between the fixed blades 7 of the fixed blades 8 and the mouth 9 is shifted. Therefore, the outdoor unit can be configured at low cost without increasing the strength of the blowing grille 25.

Further, since the stationary blades 7 and the blowing grids 25 of the stationary blades 8 can be separately formed, the molding accuracy in molding the stationary blades 7 can be improved, and the stationary blades 8 capable of efficiently recovering static pressure at low cost can be manufactured. For example, when the fixed blades 7 and the outlet grill 25 are integrally formed, it is necessary to provide fins for undercut elimination at positions where the fixed blades 7 and the outlet grill 25 intersect.

Here, the undercut refers to a shape that cannot be released only in a direction in which a mold is opened when a molded article is taken out (released) from the mold during molding, and is a shape that cannot be manufactured in a mold that is opened only in a vertical direction when a fin for solving this problem is not provided, and requires a slide core (side core) that slides in a lateral direction, which increases the cost of the mold and the manufacturing cost.

However, in the present embodiment, since it is not necessary to provide such an undercut-eliminating fin, it is possible to suppress performance deterioration when the static pressure is recovered by the stationary blades 8 due to the provision of the fin in the stationary blades 7.

The outdoor unit having the fan according to the present embodiment may be an outdoor unit of a top-face-blowing type, instead of the outdoor unit of a front-face-blowing type as shown in fig. 6.

Fig. 7 is a longitudinal sectional view of the outdoor unit of the top blowing type in which the fan is mounted according to the present embodiment. The outdoor unit of fig. 7 is different from the outdoor unit described in fig. 6 only in that the direction of the air blown out by the fan 1 is the direction of the air blown out from the upper surface portion 21b of the casing 21, and the same configuration and operation as those in the case of the front-side blowing type described in fig. 6 are employed, and therefore, the description thereof is omitted.

In the present embodiment, the fixed blades 7 of the stationary blades 8 are fixed to the mouth 9 or the casing by the support frame 11. Therefore, even when the blowout grill 25 and the stationary blade 8 are pressed in the direction of the moving blade 5, or the like, a predetermined gap between the blowout grill 25, the stationary blade 8, and the moving blade 5 can be maintained, and the stationary blade 7 of the stationary blade 8 can be prevented from contacting the moving blade 5 and deforming or breaking the moving blade 5 and the stationary blade 8.

(embodiment 2)

Fig. 8 is a meridional cross-sectional view of another fan according to embodiment 2 of the invention. Fig. 9 is a front view of another fan according to embodiment 2 of the present invention as viewed from the discharge side. In the present embodiment, the same components as those in embodiment 1 of the present invention are denoted by the same reference numerals, and description thereof is omitted.

Hereinafter, only the differences between the present embodiment and embodiment 1 of the present invention will be described. As shown in fig. 8, in the present embodiment, the extension portion front edge 12b side of the extension portion 12 is substantially parallel to the front portion 21a shown in fig. 6, while the extension portion rear edge 12a side is inclined so as to approach the front portion 21a side as going to the outer peripheral side of the fixed blade 17. Therefore, the height of the extension portion 12 in the meridional cross section is formed to be shorter toward the outer peripheral side of the fixed vane 17.

Although the blade-end vortex generated in the vicinity of the outer peripheral end of the rotary blade 4 flows downstream and is disturbed when it collides with the extension portion 12 from the outer peripheral side of the fixed blade 17, in the present embodiment, the flow disturbance in the extension portion 12 can be suppressed to a small extent by making the height of the meridional cross section of the extension portion 12 lower toward the outer peripheral side, and the flow resistance can be reduced.

As shown in fig. 9, in the present embodiment, the extension portion 12 is provided only in a part of the plurality of fixed blades 17. The total number of the fixed blades 17 is 13, while the number of the fixed blades 17x provided with the extension portions 12 is 5. In addition, 2 fixed blades 17y not provided with the extension portion 12 are arranged in the vicinity of the fixed blade 17x provided with the extension portion 12 in the upper portion in the direction of gravity, and one fixed blade 17y not provided with the extension portion 12 is arranged in the vicinity of the fixed blade 17x provided with the extension portion 12 in the lower portion. That is, the number of the fixed blades 17y provided between the 2 fixed blades 17x provided with the extension portion 12 and not provided with the extension portion 12 is smaller than the number of the lower portions of the housing 21 shown in fig. 6.

In the present embodiment, at least a part of the plurality of fixed blades 17 includes the extension portion 12 and the leg portion 13 extending from the outer peripheral end of the extension portion 12 in the direction of the mouth portion 9, and is held by the mouth portion 9 or the housing via the extension portion 12 and the leg portion 13. Therefore, even when the stationary blade 8 is pressed in the direction of the moving blade 5 and displaced, the extended portion 12 and the leg portion 13 absorb the displacement, and the stopper blade 5 and the stationary blade 8 can be prevented from being deformed or damaged. Further, since the extension portion 12 is not provided to all the fixed blades 17 but only a part of the fixed blades 17, the loss of the airflow due to the provision of the extension portion 12 is not limited to a part of the fixed blades 17 as a whole, and therefore, the improvement of the efficiency of the fixed blade 18 including the fixed hub 16 and the fixed blades 17 is not hindered.

In addition, the fixed blades 17x provided with the extension portions 12 are disposed in the lower portion in the direction of gravity, and thus sufficient strength for holding the stationary blade 18 to the support frame 11 can be secured.

As described above, the fan according to the present embodiment can achieve both improvement in aerodynamic performance and high efficiency, and can prevent the stationary blades from contacting the moving blades and causing deformation or damage to the moving blades and the stationary blades when the stationary blades are strongly pressed toward the moving blades. In addition, the outdoor unit having the fan according to the present embodiment can achieve power saving and noise reduction, and can prevent the stationary blade and the stationary blade from being deformed or damaged due to contact with the moving blade when the blowout grill is strongly pressed toward the moving blade.

(embodiment 3)

Hereinafter, a fan according to embodiment 3 of the present invention will be described with reference to the drawings. The present invention is not limited to these embodiments.

In the description of the present embodiment, the same components as those in embodiment 1 or embodiment 2 of the present invention are denoted by the same reference numerals, and the description thereof is omitted.

Hereinafter, only the differences between the present embodiment, embodiment 1 of the present invention, and embodiment 2 of the present invention will be described.

As shown in fig. 10, the leading edge 7c of the fixed vane 7 is configured to be upstream of the trailing edge 7d of the fixed vane 7. Therefore, when the fan 1 is viewed from the discharge side, the leading edge 7c of the fixed blade 7 is positioned above the trailing edge 7d in the region on the right side of the fixed hub 6, and the leading edge 7c of the fixed blade 7 is positioned below the trailing edge 7d in the region on the left side of the fixed hub 6. That is, in the region on the right side of the fixed hub 6, the fixed blades 7 are inclined downward from the windward side to the leeward side, and in the region on the left side of the fixed hub 6, the fixed blades 7 are inclined upward from the windward side to the leeward side.

In the region substantially below the rotary shaft 2 shown in fig. 1, the outer peripheral end 7b of the leading edge 7c or the trailing edge 7d of the fixed blade 7 is located below the fixed hub-side end 7a of the same fixed blade 7. As described later, the outer peripheral end 7b of the stationary blade 7 is located in the anti-rotation direction (offset) of the moving vane 5 with respect to the stationary hub-side end 7 a. Therefore, the region of the leading edge 7c or the outer peripheral end 7b of the trailing edge 7d of the fixed vane 7 located below the fixed hub-side end 7a of the same fixed vane 7 is located below the height of the rotary shaft 2 plus the distance by which the outer peripheral end 7b is offset.

As shown in fig. 10, the 11 fixed blades 7 are all formed in the same shape. However, when the driven vane 5 is rotated clockwise, the interval (pitch) between the fixed blades 7 is larger in the region on the left side of the fixed hub 6 than in the region on the right side of the fixed hub 6.

More specifically, in a region (region X1 surrounded by a broken line in fig. 10) located at the center in the vertical direction on the left side of the fixed hub 6 when viewed clockwise in the rotation direction of the driven vane 5, the interval (pitch) between the fixed vanes 7 is large, and in the other regions, 11 fixed vanes 7 are provided at the same interval (equal pitch).

The pitch of the fixed blades 7 near the region X1 is 3 times the pitch of the fixed blades 7 in the other regions. That is, if the fixed blades 7 are arranged in the region X1 at the same pitch as the fixed blades 7 provided in the region other than the region X1, 2 fixed blades 7 are arranged in the region X1.

A leading edge 7c, which is an edge on the suction side of the fixed blade 7, is linearly formed from a fixed hub side end 7a, which is an end on the fixed hub 6 side, to an outer peripheral end 7b, which is an end on the outer peripheral side. The trailing edge 7d, which is the discharge-side edge of the fixed vane 7, is curved from the fixed hub-side end 7a to the outer peripheral end 7 b. The rear edge 7d is formed in a concave curved shape in the center portion 7m in the direction of the front edge 7 c.

In the stator blade 8 shown in fig. 1 having the stationary hub 6 and the stationary blade 7, of the plurality of stationary blades 7, the stationary blade 7 in which the leading edge 7c is located below the trailing edge 7d and at least a part of the outer peripheral end 7b is located in a region (region X2 surrounded by the broken line in fig. 2) below the stationary hub-side end 7a is provided, and the outer peripheral end 7b of the stationary blade 7 is provided below the central portion 7m of the same stationary blade 7.

That is, of the plurality of stationary blades 7, the stationary blade 7 having the front edge 7c located below the rear edge 7d and at least a part of the outer peripheral end 7b located in a region (region X2 in fig. 2) below the stationary hub-side end 7a does not have a portion (horizontal portion) that is horizontal to the ground at the front edge 7c or the rear edge 7 d.

In addition, in other words, the stationary blade 8 is configured as follows: if the fixed vane 7 is disposed in the region X1 at an equal pitch to the fixed vane 7 disposed in a region other than the region X1, at least a part of the center portion 7m of the fixed vane 7 is removed from the fixed vane 7 located below the outer peripheral end 7b of the same fixed vane 7.

As shown in fig. 10, the length of the extension portion 12 connecting the fixed blade 7 and the support frame 11 (the length in the radial direction of the extension portion 12) differs depending on the position where the fixed blade 7 is attached. The extension portions 12 of the fixed blades 7 positioned vertically and horizontally in the direction of gravity are short, and the extension portions of the fixed blades 7 positioned at other positions are long. This can easily ensure sufficient strength for holding the stationary blade 8 to the support frame 11.

As described above, in the fan and the stationary blade 8 of the present embodiment, the pitch of the stationary blade 7 in the region where the leading edge 7c of the stationary blade 7 is located below the trailing edge 7d (the region on the left side of the stationary hub 6 in fig. 10) is larger than the pitch of the stationary blade 7 in the region where the leading edge 7c of the stationary blade 7 is located above the trailing edge 7d (the region on the right side of the stationary hub 6 in fig. 10).

Therefore, it is possible to reduce the occurrence of a portion where the fixed blades 7 are horizontal in a region where the fixed blades 7 are provided so that water flows in the direction of the moving blades 5. This prevents snow or the like deposited on the upper portions of the fan 1 and peripheral members thereof from melting, and water accumulated in the horizontal portion of the stationary blade 7 from growing on the movable blade 5 side as icicles. Therefore, there is no problem that the icicles interfere with the moving blades, thereby generating abnormal noise or causing damage to the moving blades.

Further, of the plurality of stationary blades 7, the leading edge 7c is positioned below the trailing edge 7d, and at least a part of the outer peripheral end 7b is positioned below the stationary hub-side end 7a, and the outer peripheral end 7b of the stationary blade 7 is positioned below the central portion 7m of the same stationary blade 7. Alternatively, at least a part of the central portion 7m of such a fixed vane 7 is not provided below the outer peripheral end 7b of the same fixed vane 7.

Therefore, the fixed blade 7, in which the front edge 7c is located below the rear edge 7d and at least a part of the outer peripheral end 7b is located below the fixed hub-side end 7a, has no horizontal portion at the front edge 7c or the rear edge 7 d. This prevents snow or the like deposited on the upper portions of the fan 1 and peripheral members thereof from melting and accumulating on the horizontal portion of the stationary blade 7, thereby causing icicles or icicles to grow.

This is explained in further detail using fig. 11. Fig. 11 is a fan in which the same diameter-shaped fixed blades 7 as those arranged in the other regions are arranged also in the region X1 for comparison with the present embodiment.

In the case of the fan of fig. 11 in which the rotation direction of the rotor blade 5 is clockwise as viewed from the discharge side, the portion of the stationary blade 7 of the stationary blade on the right side of the stationary hub 6 is inclined downward from the windward side to the leeward side, and water droplets do not flow in the direction of the rotor blade 5 even if they fall from above. However, the portion on the left side is inclined upward from the windward side to the leeward side, and therefore water droplets falling from above may flow downward in the direction of the rotor blade 5.

In addition, when the water drops falling from the upper side are snow melt water, the water drops may flow not only to the windward side, i.e., in the direction of the moving blade 5, but also grow as icicles on the fixed blade 7, interfere with the moving blade 5, and cause abnormal noise or stop of the moving blade 5 and damage.

In fig. 11, of the water droplets falling from above, the water droplets flowing down in the direction of the rotor blade 5 are water droplets that are unlikely to flow in the left-right direction (the direction of the outer peripheral end 7b or the direction of the fixed hub side end 7a) of the fixed blade 7. Such water droplets are conspicuously generated in a portion where the front edge 7c of the stationary blade 7 is horizontal (front edge horizontal portion 7e) or a portion where the rear edge 7d is horizontal (rear edge horizontal portion 7 f).

Such a horizontal portion is likely to occur when the entire front edge 7c or rear edge 7d of the fixed vane 7 is horizontal or curved when viewed from the discharge side. In particular, the leading edge 7c or the trailing edge 7d of the fixed vane 7 is curved when viewed from the discharge side, and the vane attachment angle θ of the fixed vane 7 is likely to occur when the vane attachment angle θ is configured differently depending on the position of the fixed vane 7 in the radial direction.

However, in the present embodiment, as shown in fig. 10, since the pitch of the stationary blades 7 is large in the region below the leading edge 7c and the trailing edge 7d of the stationary blade 7, it is possible to reduce the number of cases where the stationary blade 7 provided in a state where water flows easily in the direction of the rotor blade 5 has a horizontal portion, as compared with the stationary blade having the configuration of fig. 11.

Further, since the front edge 7c or the rear edge 7d of the stationary blade 7 on the left side of the stationary hub 6 does not have a horizontal portion, water droplets flow in the left-right direction without stagnation, and thus icicles heading toward the rotor blade 5 do not grow.

In particular, in the stationary blade 7, the front edge 7c is formed in a curved shape, the front edge 7c is located below the rear edge 7d, and at least a part of the outer peripheral end 7b is located below the stationary hub-side end 7a (the stationary blade disposed in the region X2 in fig. 10), the outer peripheral end 7b of the stationary blade is located below the central portion 7m, so that a horizontal portion in which water droplets are likely to accumulate can be eliminated.

Further, in the static blade 8 configured as 11 static blades 7, as shown in fig. 10, except for 2 static blades 7 having the leading edge horizontal portion 7e or the trailing edge horizontal portion 7f, which are positioned on the left side of the fixed hub 6 from the static blade having the configuration of fig. 11, there is no problem that icicles grow in the direction of the dynamic blade 5, interfere with the dynamic blade 5, abnormal noise is generated, or the dynamic blade 5 stops or is damaged. Further, the number of fixed blades included in the stationary blade 8 is minimized, and the effect of recovering the static pressure of the stationary blade 8 can be maintained to the maximum.

Further, since the extension portion 12 and the leg portion 13 are not provided in addition to the fixed blade 7 in the region X1, there is no problem that water droplets are accumulated in the horizontal portions of the extension portion 12 and the leg portion 13, and the water droplets become starting points of generation and growth of ice.

In the present embodiment, the pitch is increased by removing 2 fixed blades 7 from the fixed blade having the configuration of fig. 11 and making the pitch of the fixed blades 7 different in the region on the left side of the fixed hub 6. However, the present invention is not limited to this, and the region on the left side of the fixed hub 6 can be made equidistant as long as the pitch of the region on the left side of the fixed hub 6 is larger than the pitch of the region on the right side of the fixed hub 6. In addition, when the region on the left side of the fixed hub 6 is also equally spaced, it is preferable to arrange the fixed blades so that the entire stationary blade 8 is slightly rotated and no horizontal portion is generated.

In the present embodiment, the front edge 7c of the fixed blade 7 is made linear and the rear edge 7d is made curved, but from the viewpoint of not providing a portion where water droplets are likely to accumulate, the front edge 7c may be made curved and the rear edge 7d may be made linear.

In the outdoor unit on which the fan of the present embodiment is mounted, the stationary blade 7 having such a shape as to prevent water from flowing down in the direction of the moving blade 5 has a horizontal portion. Therefore, it is possible to prevent snow or the like deposited on the upper portion of the outdoor unit from melting, accumulating on the fixed blades 7, or generating or growing icicles.

In such an outdoor unit, since the fixed blades 7 of the fixed blades 8 and the outlet grill 25 (see fig. 6 below) are not directly fixed but fixed to the casing 21, even if an external force is applied to the outlet grill 25 by dropping or artificial pressure from the front, the external force is absorbed to some extent by the deformation of the front surface portion 21a of the casing 21, and there is no case where the fixed blades 8 are deformed or the positional relationship between the fixed blades 7 of the fixed blades 8 and the mouth 9 is shifted. Therefore, the outdoor unit can be configured at low cost without increasing the strength of the blowing grille 25.

(embodiment 4)

Hereinafter, a fan according to embodiment 4 of the present invention will be described with reference to the drawings. The present invention is not limited to these embodiments.

In the description of the present embodiment, the same reference numerals are given to the same components as those in embodiment 1 of the present invention, embodiment 2 of the present invention, or embodiment 3 of the present invention, and the description thereof is omitted.

Hereinafter, only the differences between the present embodiment and embodiment 1 of the present invention, embodiment 2 of the present invention, or embodiment 3 of the present invention will be described.

Fig. 12 is a front view of the fan according to embodiment 4 of the present invention as viewed from the discharge side. In the present embodiment, the same components as those in the other embodiment are denoted by the same reference numerals, and the description thereof is omitted.

As shown in fig. 8, a stationary blade 8 is provided on the discharge side (downstream side) of the moving blade 5, and the stationary blade 8 includes a

stationary hub

6 and 12 stationary blades 7 provided around the stationary hub 6. The stationary blade 8 has a pitch of the stationary blades 7 2 times that of the stationary blades 7 in the other region, in a region located on the left side of the rotary shaft 2 (see fig. 1 below) and at the center in the vertical direction when viewed in the clockwise direction of the rotation direction of the moving blade 5. That is, if the fixed blades 7 having the same shape are arranged at equal intervals, 1 fixed blade 7 is arranged in a region located on the left side of the rotary shaft 2 and at the center in the vertical direction when viewed in the clockwise direction of the rotation direction of the driven vane 5.

The shape of the fixed blade 27 provided in the region on the left side of the fixed hub 6 when viewed clockwise in the rotation direction of the driven vane 5 is different from the shape of the fixed blade 7 provided in the region on the right side of the fixed hub 6.

The fixed blades 27 having different shapes are as follows: if the fixed blades 7 having the same shape are arranged at equal intervals, at least a part of the central portion 7m of the fixed blade is located below the outer peripheral end 7b of the fixed blade. The fixed blade 27 has a shape in which no horizontal portion is provided from the central portion 27m to the outer peripheral end 7b of the fixed blade.

More specifically, the shape between the central portion 27m of the fixed blade 27 and the fixed hub-side end 27a is the same as that of the other fixed blades 7, and the shape between the central portion 27m and the outer peripheral end 27b is different. The rear edge 27d of the fixed blade 27 is formed in a curved shape between the central portion 27m of the fixed blade 27 and the fixed hub-side end 27a, but is formed in a straight shape between the central portion 27m and the outer peripheral end 27 b.

The meridian plane height h2 of the fixed vane 27 is constant from the fixed hub side end 27a to the outer peripheral end 27b, as is the meridian plane height h2 (see fig. 1 below) of the other 11 fixed vanes 7. The blade attachment angle θ of the fixed blade 27 (see fig. 3A and 3B below) is set to be larger on the outer peripheral end 27B side of the central portion 27m than on the fixed hub side end 27a side of the central portion 27m than on the blade attachment angle θ a of the other 11 fixed blades 7, as compared with the blade attachment angle θ of the other 11 fixed blades 7.

Therefore, the front edge 27c of the fixed vane 27 is formed linearly between the central portion 27m of the fixed vane 27 and the fixed hub side end 27a, similarly to the other 11 fixed vanes 7, but is formed in a curved shape between the central portion 27m and the outer peripheral end 27 b.

Alternatively, the stationary blade 18 is provided with the same shape of the stationary blades 7 in the region X1 at a pitch equal to that of the stationary blades 7 provided in the region other than the region X1 shown in fig. 10, as described below. Namely, the structure is as follows: at least a part of the center portion 7m of the fixed vane 7 is removed from 1 of the fixed vanes 7 having more horizontal portions of the front edge 7c or the rear edge 7d than the outer peripheral end 7b of the same fixed vane 7, and a part of the shape of 1 fixed vane having less horizontal portions is corrected. In the present embodiment, as shown in fig. 12, since at least 1 of the fixed blades 7 in the region where the leading edge 7c of the fixed blade 7 is located below the trailing edge 7d has a different shape, it is possible to reduce the number of cases where the fixed blade 7 provided in a state where water flows easily in the direction of the rotor blade 5 has a horizontal portion, as compared with the fixed blade having the configuration of fig. 11.

Further, since the front edge 7c and the front edge 27c or the rear edge 7d and the rear edge 27d of the fixed blade 7 and the fixed blade 27, which are positioned on the left side of the fixed hub 6, do not have a horizontal portion, water droplets flow in the left-right direction without stagnation, and thus icicles going to the rotor blade 5 do not grow.

In the static vane having the configuration of fig. 11, one of the 2 fixed blades 7 having the leading edge horizontal portion 7e or the trailing edge horizontal portion 7f, which is positioned on the left side of the fixed hub 6, is removed, and the other fixed blade 27 is partially modified in shape, and the portion of the trailing edge 27d that becomes horizontal is changed to a portion that changes in inclination in the left-right direction, so that the portion that does not become horizontal is formed in a shape inclined to one side. Therefore, since the water droplets flow in the left-right direction (the direction of the outer peripheral end 27b or the direction of the fixed hub side end 27 a) without stagnation, there is no problem that icicles that go to the moving blades 5 grow, interfere with the moving blades 5, generate abnormal noise, and stop or damage the moving blades 5. Further, the number of the fixed blades having different shapes is minimized, and the effect of collecting the static pressure of the static vanes 18 can be maintained to the maximum.

The shape correction from the fixed vane 7 to the fixed vane 27 is performed by correcting the curved shape formed by the trailing edge 7d of the fixed vane 7, but the meridional plane height h2 in fig. 1 and the vane attachment angle θ in fig. 3A to 3C are not changed. Therefore, although the leading edge 27c of the fixed vane 27 is also different in shape from the fixed vane 7, this correction does not substantially cause a reduction in the performance of recovering static pressure. This is because the performance of the static vane 8 in recovering static pressure is greatly affected by the meridional plane height h2 and the blade attachment angle θ.

In the present embodiment, 1 fixed blade 7 is removed from the stationary blade having the configuration of fig. 11, and 1 fixed blade is subjected to shape correction. This is because the entire fixed blade of the former fixed blade 7 is substantially horizontal, and the danger of icicles can be avoided more reliably than the case of the shape correction when the fixed blade is removed. Therefore, depending on the posture of the fixed blade 7, the shape of all the fixed blades that may grow icicles may be corrected without removing the former fixed blade 7.

In the present embodiment, the front edge 7c of the fixed blade 7 is made linear and the rear edge 7d is made curved, but from the viewpoint of not providing a portion where water droplets are likely to accumulate, the front edge 7c may be made curved and the rear edge 7d may be made linear. In this case, the fixed blade 27 having the modified shape may be linear between the center portion 27m of the front edge 27c and the fixed hub side end 27a, curved between the center portion 27m and the outer peripheral end 27b, curved between the center portion 27m of the rear edge 27d and the fixed hub side end 27a, and linear between the center portion 27m and the outer peripheral end 27 b.

As described above, the fan according to the present embodiment can prevent the stationary blade 7, which is disposed in such a shape as to flow down in the direction of the rotor blade 5, from having a horizontal portion. Therefore, snow or the like deposited on the upper portions of the fan 1 and the peripheral components thereof can be prevented from melting and accumulating on the fixed

blades

7 and 27, or from being generated or growing in icicles. Therefore, the ice column and the movable blade do not interfere with each other, abnormal noise is generated, and the movable blade stops and is damaged.

In addition, the outdoor unit having the fan according to the present embodiment can prevent the stationary blade 7, which is disposed in such a shape as to flow down in the direction of the moving blade 5, from having a horizontal portion. Therefore, it is possible to prevent snow or the like deposited on the upper portion of the outdoor unit from melting, accumulating on the fixed blades 7, or generating or growing icicles.

As described above, the present invention includes: a moving vane, comprising: a rotating hub having a rotating shaft and a plurality of rotating blades disposed around the rotating hub; a mouth part arranged at the outer periphery of the movable vane; and a stationary blade, disposed at a discharge side of the moving blade, including a stationary hub and a plurality of stationary blades disposed around the stationary hub. Further, the blade attachment angle of the stationary blade with respect to a plane perpendicular to the center axis of the stationary blade is larger than the blade attachment angle of the stationary blade on the stationary hub side with respect to the center portion in the radial direction of the stationary blade.

According to this configuration, the main flow of the air flow discharged from the rotor blade is concentrated, the swirl direction component is increased, and the collision loss at the inlet of the stationary blade is suppressed to be small at the outer peripheral side of the central portion of the stationary blade. Therefore, the swirl direction component can be efficiently recovered as the static pressure.

In the present invention, the blade attachment angle of the fixed blade is largest between the center and the outer peripheral end of the fixed blade in the radial direction.

According to this configuration, since the blade attachment angle of the outer peripheral end of the fixed blade is slightly smaller than the blade attachment angle from the center portion to the outer peripheral side, the collision loss at the inlet of the fixed blade can be suppressed to be small at the outer peripheral end of the fixed blade. Therefore, the swirl direction component can be efficiently recovered as the static pressure from the center portion to the outer peripheral side of the fixed blade, and further, at the outer peripheral end.

In the present invention, the blade attachment angle of the outer peripheral end of the fixed blade is smaller than the blade attachment angle of the central portion of the fixed blade in the radial direction.

According to this configuration, the collision loss at the inlet of the fixed vane can be suppressed to be small at the outer peripheral end of the fixed vane. Therefore, the swirl direction component can be efficiently recovered as the static pressure from the center portion to the outer peripheral side of the fixed blade, and the swirl direction component can be efficiently recovered as the static pressure even at the outer peripheral end affected by the leakage flow of the rotating blade of the moving blade and the blade end vortex.

In the present invention, the fixed blades have a fixed meridional height from the fixed hub side to the outer peripheral end, which is the height of a plane projected by rotation to the center axis of the stationary blade.

According to this configuration, since the chord length is suppressed from extending from the fixed hub side to the outer peripheral side of the fixed blade, it is possible to suppress an increase in loss due to the surface friction loss of the fixed blade and an increase in wake width of the wake. Further, since the chord length is kept from extending even in the vicinity of the outer peripheral end of the stationary blade, it is possible to suppress as much as possible the influence of the leakage flow between the rotor blade and the port and the blade-end vortex generated at the blade end of the rotor blade, which are likely to be influenced when the chord length at the outer peripheral end is long (when the meridian plane height is high). Therefore, the swirl direction component of the airflow at the outer peripheral end of the fixed blade can be recovered as the static pressure while suppressing an increase in loss due to turbulence.

In the present invention, the outer peripheral side of the fixed blade is inclined with respect to the fixed hub side in the counter-rotation direction of the moving blade in a plane perpendicular to the rotation axis.

According to this configuration, since the air flow discharged from the driven vane passes through the fixed vane of the stationary vane at different timings in the radial direction, the noise generated when the air flow passes through the stationary vane can be reduced.

In addition, the present invention includes: a moving vane, comprising: a rotating hub having a rotating shaft and a plurality of rotating blades disposed around the rotating hub; a mouth part arranged at the outer periphery of the movable vane; and a stationary blade, disposed at a discharge side of the moving blade, including a stationary hub and a plurality of stationary blades disposed around the stationary hub. In addition, the mouth portion includes: a minimum diameter portion in which a gap between the mouth portion and the outer peripheral end of the rotary blade is minimum; and a discharge-side opening portion provided on the discharge side of the minimum diameter portion and having a diameter larger than that of the minimum diameter portion. The fixed blade is provided such that the axial position of the outer peripheral end of the leading edge, which is the edge on the suction side of the fixed blade, is located between the minimum diameter portion and the discharge-side opening portion.

According to this configuration, the discharge airflow from the region from the outer peripheral side to the outer peripheral end of the rotor blade flows into the space between the blades of the stationary blade before being transferred to the flow having the radial component as it goes to the discharge-side opening of the port. Therefore, the airflow can be forcibly switched to the axial direction, and the static pressure can be efficiently recovered.

In the present invention, a predetermined gap is provided between the outer peripheral end of the front edge and the mouth portion.

With this configuration, leakage flow is intentionally generated slightly from the pressure surface side to the negative pressure surface side of the leading edge of the stationary blade, and thus generation of an airflow that is not converted into static pressure can be suppressed on the trailing edge side, which is the edge on the blowout side near the outer peripheral end of the stationary blade, and static pressure can be recovered efficiently.

In the present invention, at least a part of the plurality of stationary blades provided in the stationary blade is provided with an extension portion extending only on the trailing edge side of the outer peripheral end in the radial direction, and the stationary blade is held by the casing holding the mouth portion via the extension portion.

According to this configuration, even if the extension portion is provided, the flow of air flowing into the leading edge side of the fixed blade is not disturbed, so that loss of the air flow can be reduced as much as possible. Therefore, the stationary blade can be held by the housing holding the mouth portion without hindering the improvement in efficiency due to the recovery of the static pressure of the stationary blade. Further, by providing the extension portion in a part of the plurality of fixed blades instead of the whole fixed blades, the loss of the airflow in the extension portion can be further reduced.

In addition, the present invention includes: a moving vane, comprising: a rotating hub having a rotating shaft and a plurality of rotating blades disposed around the rotating hub; and a stationary blade, disposed at a discharge side of the moving blade, including a stationary hub and a plurality of stationary blades disposed around the stationary hub. In the stationary blade, the distance between the stationary blades provided in a region where the leading edge of the stationary blade is located below the trailing edge is greater than the distance between the stationary blades provided in a region where the leading edge of the stationary blade on the suction side is located above the trailing edge of the stationary blade on the discharge side.

According to this configuration, the portion where water droplets are likely to accumulate can be reduced from the stationary blade in the region where water flows in the direction of the rotor blade. Thus, under the condition that snow or frost deposited on the upper portion of the fan and its peripheral components is melted by sunlight or the like and transmitted to the fixed blades, and the snow-melted water is re-frozen and grows into icicles, the icicles can be prevented from growing from water droplets deposited on the fixed blades to the upwind side of the fixed blades. Therefore, the icicles can be prevented from interfering with the moving blades to generate abnormal noise or stop the moving blades.

In addition, the present invention includes: a moving vane, comprising: a rotating hub having a rotating shaft and a plurality of rotating blades disposed around the rotating hub; and a stationary blade, disposed at a discharge side of the moving blade, including a stationary hub and a plurality of stationary blades disposed around the stationary hub. The shape of at least 1 of the fixed blades provided in the region where the leading edge of the fixed blade is located below the trailing edge is different from the shape of the fixed blade provided in the region where the leading edge of the fixed blade is located above the trailing edge. The horizontal portion is not provided from the center portion to the outer peripheral end of the fixed blade.

According to this configuration, the horizontal portion in which water droplets are likely to accumulate can be reduced from the stationary blade in the region where water flows in the direction of the moving blade. Thus, under the condition that snow or frost deposited on the upper portion of the fan and its peripheral components is melted by sunlight or the like and transmitted to the fixed blades, and the snow-melted water is re-frozen and grows into icicles, the icicles can be prevented from growing from water droplets deposited on the fixed blades to the upwind side of the fixed blades. Therefore, the icicles can be prevented from interfering with the moving blades to generate abnormal noise, or the moving blades can be prevented from stopping or being damaged.

In the present invention, at least one of the leading edge and the trailing edge of the plurality of fixed blades is formed in a curved shape, and the outer peripheral end of the fixed blade, of which the leading edge is located below the trailing edge and at least a part of the outer peripheral end is located below the end on the fixed hub side, is provided below the center portion of the fixed blade.

According to this configuration, the horizontal portion where water droplets easily accumulate on the stationary blade can be eliminated.

In the present invention, among the plurality of fixed blades, the fixed blade having the front edge positioned below the rear edge is configured in the same shape as the fixed blade having the front edge positioned above the rear edge, and the fixed blade having the center portion positioned below the outer peripheral end of the fixed blade is not included.

According to this configuration, the number of the stationary blades can be minimized, the effect of the stationary blades can be maintained at a maximum, and water droplets can be prevented from accumulating in the stationary blades.

In the present invention, the stationary blade provided with no horizontal portion is a stationary blade as follows: among the plurality of fixed blades, a fixed blade having a front edge positioned below a rear edge is configured in the same shape as a fixed blade having a front edge positioned above a rear edge, and at least a part of a central portion of the fixed blade is positioned below an outer peripheral end of the fixed blade.

According to this configuration, the number of the stationary blades having different shapes can be reduced to the minimum, the effect of the stationary blades can be maintained to the maximum, and water droplets can be prevented from accumulating in the stationary blades.

In the present invention, the installation angle of the fixed blade not provided with the horizontal portion is the same as that of the other fixed blades.

According to this configuration, it is possible to minimize the performance degradation associated with the shape change of the stationary blade and to prevent water droplets from accumulating on the stationary blade.

In addition, the present invention includes a moving vane comprising: a rotating hub having a rotating shaft and a plurality of rotating blades disposed around the rotating hub; a mouth part arranged at the outer periphery of the movable vane; and a stationary blade, disposed at a discharge side of the moving blade, including a stationary hub and a plurality of stationary blades disposed around the stationary hub. The stationary vane is provided with an annular support frame centered on the rotation axis on its outer periphery, and the support frame and the mouth are fixed.

With this configuration, the stationary blade and the moving blade can be prevented from being deformed or damaged due to contact therebetween, for example, when the stationary blade is strongly pressed toward the moving blade.

In addition, according to the present invention, at least a part of a plurality of stationary blades provided in a stationary vane is provided with: an extension portion extending in a radial direction only on a rear edge side of the outer peripheral end; and a leg portion extending from an outer peripheral end of the extension portion in a direction toward the mouth portion, wherein the stationary blade is held by the mouth portion via the extension portion and the leg portion.

According to this configuration, it is possible to prevent the moving blade or the stationary blade from being deformed or damaged due to contact between the stationary blade and the moving blade while suppressing an increase in input and an increase in noise caused by an increase in resistance of the airflow near the outer periphery of the stationary blade.

In the present invention, the fixed blade and the support frame are integrally formed.

According to this configuration, the strength of the fixed blade and the support frame can be increased, and the fixed blade and the moving blade are prevented from coming into contact with each other and causing deformation or damage to the moving blade or the fixed blade.

The present invention is the outdoor unit with the fan according to the present invention described above. With this configuration, the outdoor unit can prevent the fixed blades and the blowout grill from coming into contact with the moving blades and causing deformation or damage to the moving blades or the fixed blades.

Industrial applicability of the invention

As described above, the fan of the present invention can achieve both improvement in aerodynamic performance and high efficiency, and therefore can be applied not only to air conditioning equipment for air conditioners for home use, industrial use, and the like, freezing and refrigerating equipment for home use, freezing and refrigerating equipment for refrigerators, vending machines, and the like, heat pump equipment for water heaters, and electronic equipment having thermionic components, but also to AV equipment, waste heat recovery equipment, and the like.

Description of the reference numerals

1 blower

2 rotating shaft

3 rotating hub

4 rotating blade

4a rotating blade trailing edge

5 moving wing piece

6. 16 fixed hub

7. 17, 17x, 17y, 27 fixed blade

7a, 17a, 27a fixed hub side end

7b, 17b, 27b peripheral ends

7c, 17c, 27c leading edge

7d, 17d, 27d trailing edge

7e horizontal part of front edge

7f rear edge horizontal part

7m, 17m, 27m central part

8. 18 static wing

9 mouth part

9x minimum diameter part

9y discharge side opening

9z suction side opening part

10 electric motor

11 supporting frame

12 extension part

12a extended trailing edge

12b extended front edge

13 feet

21 casing

21a front face part

22 compressor

23 outdoor heat exchanger

24 motor fixing piece

25 blow out the grid.

Claims

1. A fan, comprising:

a moving vane, comprising: a rotating hub having a rotating shaft and a plurality of rotating blades disposed around the rotating hub; and

a stationary blade provided on a discharge side of the moving blade, including a stationary hub and a plurality of stationary blades provided around the stationary hub,

in the stationary blade, the distance between the stationary blades provided in a region where the leading edge of the stationary blade is positioned below the trailing edge of the stationary blade is larger than the distance between the stationary blades provided in a region where the leading edge of the stationary blade is positioned above the trailing edge of the stationary blade, wherein the leading edge of the stationary blade is the edge on the suction side of the stationary blade, and the trailing edge of the stationary blade is the edge on the discharge side of the stationary blade.

2. A fan, comprising:

a shape of at least 1 of the fixed blades provided in a region where a front edge of the fixed blade is located below a rear edge is different from a shape of the fixed blade provided in a region where the front edge of the fixed blade is located above the rear edge, and a horizontal portion is not provided from a central portion to an outer peripheral end,

the fixed blade not provided with the horizontal portion is a fixed blade as follows: among the plurality of fixed blades, a fixed blade having a front edge positioned below a rear edge is configured in the same shape as a fixed blade having a front edge positioned above a rear edge, and at least a part of a central portion of the fixed blade is positioned below an outer peripheral end of the fixed blade.

3. The fan of claim 1 or 2, wherein:

among the plurality of fixed blades, at least one of the leading edge and the trailing edge is formed in a curved shape, and among the plurality of fixed blades, a fixed blade in which the leading edge is positioned below the trailing edge and at least a part of the outer peripheral end is positioned below one end on the fixed hub side is provided with the outer peripheral end below a central portion of the fixed blade.

4. The fan of claim 1 or 2, wherein:

among the plurality of fixed blades, a fixed blade having a front edge positioned below a rear edge is configured in the same shape as a fixed blade having a front edge positioned above a rear edge, and does not have a fixed blade having a center portion at least a portion of which is positioned below an outer peripheral end of the fixed blade.

5. A fan, comprising:

a moving vane, comprising: a rotating hub having a rotating shaft and a plurality of rotating blades disposed around the rotating hub; a mouth portion provided on an outer peripheral side of the movable vane; and

the stationary vane is provided with an annular support frame centered on the rotation axis on the outer periphery thereof, the support frame and the mouth are fixed to each other,

at least a part of the plurality of stationary blades provided to the stationary blade is provided with: an extension portion extending in a radial direction only on a rear edge side of the outer peripheral end; and a leg portion extending from an outer peripheral end of the extension portion in a direction toward the mouth portion,

the static wing is held to the mouth by the extension and the foot.