CN215908075U

CN215908075U - Axial fan and air conditioner

Info

Publication number: CN215908075U
Application number: CN202122394109.6U
Authority: CN
Inventors: 唐林强; 曹法立; 司理涛
Original assignee: Qingdao Hisense Hitachi Air Conditioning System Co Ltd
Current assignee: Qingdao Hisense Hitachi Air Conditioning System Co Ltd
Priority date: 2021-09-30
Filing date: 2021-09-30
Publication date: 2022-02-25
Anticipated expiration: 2031-09-30

Abstract

The utility model provides an axial fan and an air conditioner, which comprise a hub and a plurality of blades, wherein the blades are arranged at intervals along the circumferential direction of the hub and are provided with a front edge, a tail edge and an outer edge; the tail edge is provided with a plurality of bristles along the length direction, the axial cylindrical section of the fan where the roots of the bristles are located is taken as a section S, and the extending direction of the bristles is superposed with the tangent line of the roots of the bristles on the section S. Through set up a plurality of brush hairs on axial fan blade trailing edge, because the brush hair has certain softness, when the fan rotated, its a plurality of brush hairs can have the swing of certain degree along with the air current, and then can smooth the export air current effectively, played the rectification effect, reduced the big fluctuation of export air current, reduced the export air current sudden change promptly, and the air current sudden change is an important source of axial fan noise of operation, then this application can effectively reduce axial fan noise, and then reduces off-premises station noise of operation.

Description

Axial fan and air conditioner

Technical Field

The utility model relates to the technical field of air conditioners, in particular to an axial flow fan capable of reducing noise and an air conditioner with the axial flow fan.

Background

Axial flow fans are mostly adopted in air-conditioning axial flow fans, and operation noise is inevitably accompanied in the operation process of the axial flow fans, so that certain noise pollution is brought to daily life of people. With the enhancement of environmental awareness and the pursuit of quality of life of people, the noise pollution of the axial flow fan has attracted sufficient attention, and air conditioner manufacturers have stricter and stricter requirements on the control of the running noise of the axial flow fan.

Therefore, how to effectively reduce the operation noise of the axial flow fan is a technical problem to be solved.

SUMMERY OF THE UTILITY MODEL

The utility model provides an axial flow fan and an air conditioner, and solves the problem that the noise of the axial flow fan of the air conditioner is high in the prior art.

In some embodiments of the present application, an axial fan is provided, comprising a hub and a plurality of blades spaced circumferentially about the hub, the blades having a leading edge, a trailing edge, and an outer edge connecting an outer end of the leading edge and an outer end of the trailing edge; the fan is characterized in that a plurality of bristles are distributed on the tail edge along the length direction of the tail edge, the axial cylindrical section of the fan where the roots of the bristles are located is a section S, and the extending direction of the bristles is overlapped with a tangent line passing through the roots of the bristles on the section S.

Through set up a plurality of brush hairs on axial fan blade trailing edge, because the brush hair has certain softness, when the fan rotated, its a plurality of brush hairs can have the swing of certain degree along with the air current, and then can smooth the export air current effectively, played the rectification effect, reduced the big fluctuation of export air current, reduced the export air current sudden change promptly, and the air current sudden change is an important source of axial fan noise of operation, then this application can effectively reduce axial fan noise, and then reduces off-premises station noise of operation.

In some embodiments of the present application, the bristles are adhesively secured to the trailing edge.

In some embodiments of the present application, the bristles have an aspect ratio in the range of 5:1 to 20:1, and the bristles gradually decrease in diameter from the root to the tip of the bristles.

In some embodiments of the present application, the ratio of the cross-sectional area of the bristle where the diameter is largest to the cross-sectional area where the diameter is smallest is not greater than 5: 1.

In some embodiments of the present application, the trailing edge is semi-circular in cross-section, and the ratio of the radius of the cross-section of the trailing edge to the radius of the root of the bristle is 2:1 to 4: 1.

In some embodiments of the present application, the distance between the roots of two adjacent bristles is less than the length of the bristles.

In some embodiments of the present application, the plurality of bristles are arranged in two rows along the width of the trailing edge, and the two rows of bristles are aligned or staggered one by one.

In some embodiments of the present application, all of the bristles are uniform in length; or the length of the back row of bristles is greater than that of the front row of bristles in the two rows of bristles.

In some embodiments of the present application, the plurality of bristles are arranged in three rows along the width direction of the tail edge, and the three rows of bristles are aligned one by one or any two adjacent rows of bristles are arranged in a staggered manner; all the bristles have the same length, or the bristles in the middle of the three rows have the largest length.

In some embodiments of the present application, an air conditioner is further provided, in which an outdoor unit is provided with the axial flow fan.

Drawings

Fig. 1 is a schematic perspective view of an axial flow fan according to an embodiment;

FIG. 2 is a front view in the direction of A of FIG. 1;

FIG. 3 is a front view in the direction B of FIG. 1;

FIG. 4 is an enlarged view of section C of FIG. 3;

FIG. 5 is a cross-sectional view at a trailing edge of a blade of an axial flow fan according to an embodiment.

Reference numerals: 100-axial fan; 110-a hub; 120-blades; 121-leading edge; 122-trailing edge; 123-outer edge; 130-bristles.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it is to be understood that the terms "center," "upper," "lower," "front," "back," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application.

In the description of the present application, it is to be understood that the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

The air conditioner performs a cooling and heating cycle of the air conditioner by using a compressor, a condenser, an expansion valve, and an evaporator. The cooling and heating cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies a refrigerant medium to the air that has been conditioned and heat-exchanged.

The compressor compresses a refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.

The expansion valve expands the high-temperature and high-pressure liquid-phase refrigerant condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a refrigerating effect by heat exchange with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner can adjust the temperature of the indoor space throughout the cycle.

The outdoor unit of the air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.

The indoor heat exchanger and the outdoor heat exchanger serve as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater in a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler in a cooling mode.

The refrigeration working principle of the air conditioner is as follows: the compressor works to enable the interior of an indoor heat exchanger (in an indoor unit, the evaporator at the moment) to be in an ultralow-pressure state, liquid refrigerant in the indoor heat exchanger is quickly evaporated to absorb heat, air blown out by a fan is cooled by an indoor heat exchanger coil pipe to become cold air to be blown into a room, the evaporated and vaporized refrigerant is compressed by the compressor, is condensed into liquid in a high-pressure environment in an outdoor heat exchanger (in an axial flow fan, the condenser at the moment) to release heat, and the heat is dissipated into the atmosphere through the axial flow fan, so that the refrigeration effect is achieved by circulation.

The heating working principle of the air conditioner is as follows: the gaseous refrigerant is pressurized by the compressor to become high-temperature and high-pressure gas, and the high-temperature and high-pressure gas enters the indoor heat exchanger (the condenser at the moment), is condensed, liquefied and released heat to become liquid, and simultaneously heats indoor air, so that the aim of increasing the indoor temperature is fulfilled. The liquid refrigerant is decompressed by the throttling device, enters the outdoor heat exchanger (an evaporator at the moment), is evaporated, gasified and absorbs heat to form gas, absorbs the heat of outdoor air (the outdoor air becomes cooler) to form gaseous refrigerant, and enters the compressor again to start the next cycle.

Referring to fig. 1 to 4, according to some embodiments of the present application, an air conditioner includes an indoor unit installed in an indoor space and an outdoor unit installed in an outdoor space, and the indoor unit and the outdoor unit are connected by a pipe. The outdoor unit includes a casing and an axial flow fan 100 provided in the casing, and may further include a compressor, an outdoor heat exchanger, an expander, and the like of a refrigeration cycle. The axial flow fan 100 includes a hub 110 and a plurality of blades 120, the plurality of blades 120 are arranged at intervals along the circumferential direction of the hub 110, in this embodiment, three blades 120 are uniformly distributed along the circumferential direction, for example, the blade 120 has a leading edge 121, a trailing edge 122, and an outer edge 123 connecting the outer end of the leading edge 121 and the outer end of the trailing edge 122; the trailing edge 122 has a plurality of bristles 130 disposed along the length thereof, wherein the bristles 130 are linear bristles in this embodiment. Through set up the brush form part of making an uproar that falls on trailing edge 130, because brush hair 130 has certain softness, when the fan rotated, its a plurality of brush hairs 130 can have certain swing along with the air current, and then can smooth trailing edge 122 department export air current effectively, reduced the big fluctuation of export air current, reduce export air current sudden change promptly, and the air current sudden change is an important source of axial fan running noise, then this application can effectively reduce axial fan noise, and then reduces off-premises station running noise.

The axial cylindrical sections of the fan corresponding to the roots of the bristles 130 at different radii on the trailing edge 122 (i.e., the connection ends of the bristles 130 and the trailing edge 122) are different, and for convenience of description, any axial cylindrical section of the fan is denoted as section S. Taking one of the bristles 130 as an example, the root of the bristle 130 is located in the axial cylindrical cross section of the fan (i.e. the dashed circle in fig. 3 and 4), and the tangent line (i.e. the solid line a in fig. 3 and 4) passing through the root of the bristle 130 on the cross section S coincides with the extending direction of the bristle 130. Because the tangent line of the root of the bristles on the cross section S is the straight line of the outlet airflow direction of the root point of the bristles, the extension direction of the bristles is superposed with the outlet airflow direction of the root point of the bristles, so that the bristles can swing near the outlet airflow along with the outlet airflow to smooth the airflow, thereby further reducing the fluctuation of the outlet airflow at the position and further enhancing the noise reduction effect.

Specifically, the brush bristles 130 have certain softness and toughness, can swing with the air flow when the fan rotates, and can reset when the fan stops working, and the brush bristles 130 can be made of a polymeric material, such as polypropylene, silica gel or a rubber material, can be made into a strip-shaped whole, and comprise a strip-shaped soft base plate, and the brush bristles 130 are fixedly arranged on the soft base plate and are fixedly arranged on the tail edge 122 in a bonding mode basically through the softness, or the brush bristles 130 are directly bonded on the tail edge 122.

In order to reduce the weight of the bristles 130 as much as possible so that the bristles 130 can swing with the fan to a certain extent to smooth the outlet airflow, the bristles 130 are as slender as possible, and it is preferable that the aspect ratio (i.e., the ratio of the length to the diameter) of the bristles 130 in this embodiment is in the range of 5:1 to 20:1, and the diameter of the bristles 130 is gradually reduced from the root portions to the tip portions (i.e., the free end portions) thereof, like a needle shape.

Further, as a result of experimental simulation, the ratio of the cross-sectional area of the bristle 130 where the diameter is the largest (i.e., the root) to the cross-sectional area of the bristle 130 where the diameter is the smallest (i.e., the tip) is not more than 5: 1.

Referring to FIG. 5, the trailing edge 122 of this embodiment is semi-circular in cross-section and has a ratio of the radius R of the cross-section to the radius R of the base of the bristles 230 of 2:1 to 4: 1.

Since the outlet airflow is primarily concentrated on the portion of trailing edge 122 near outer edge 123, and correspondingly, bristles 130 are primarily concentrated on the portion of trailing edge 122 near outer edge 123, as shown in fig. 1-3, bristles 130 are primarily concentrated at the arc 2/3 from the outer end of trailing edge 122 inward to trailing edge 122.

When the thickness of the blade 120 is larger and the size of the blade 120 is larger, the number of the bristles 130 is preferably correspondingly increased, in this case, the bristles 130 are arranged in a plurality of rows along the width direction of the trailing edge 130 in addition to the length direction of the trailing edge 122, and each row of bristles 130 includes a plurality of bristles 130 arranged along the length direction of the trailing edge 122. Because of the limited width of the trailing edge 122, the rows of bristles 130 are preferably two or three rows.

When all the bristles 130 are arranged in two rows along the width direction of the trailing edge 122, the bristles 130 in one row are aligned with or misaligned from the bristles 130 in the other row. When the lengths of all the bristles 130 are uniform, or when the lengths of the two rows of bristles 130 are not uniform, the length of the rear row of bristles 130 (i.e., near the back surface of the blade, i.e., the suction surface) should be greater than the length of the front row of bristles 130 (i.e., near the front surface of the blade, i.e., the pressure surface). The outlet air flow is rectified by the front row of bristles 130 and then further rectified by the rear row of bristles 130, so that the rectification effect on the air flow is improved.

Similarly, when all the bristles 130 are arranged in three rows along the width direction of the trailing edge 122, the three rows of bristles are aligned one by one or any two adjacent rows of bristles are arranged in a staggered manner. When any two adjacent rows of bristles 130 are staggered, the bristles 130 in the last row are aligned with the bristles 130 in the first row.

In addition, all of the bristles 130 are uniform in length; or the length of the bristles 130 in the middle row is the greatest, and is greater than the length of the bristles 130 in the rear and front rows. The air flows on the two sides respectively flow through the rear row of brush bristles 130 and the front row of brush bristles 130 and then are rectified again through the middle row of brush bristles 130, namely, the outlet air flow of the pressure surface is rectified by the front row of brush bristles and then rectified by the middle row, and the outlet air flow of the suction surface is rectified by the rear row of brush bristles and then rectified by the middle row, so that the layered rectification effect is achieved, the sudden change of the air flow is further reduced, and the noise reduction effect is improved.

The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the utility model may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.

Claims

1. An axial fan comprising a hub and a plurality of blades spaced circumferentially about said hub, said blades having a leading edge, a trailing edge, and an outer edge connecting an outer end of said leading edge to an outer end of said trailing edge; the method is characterized in that: the fan is characterized in that a plurality of bristles are distributed on the tail edge along the length direction of the tail edge, the axial cylindrical section of the fan where the roots of the bristles are located is a section S, and the extending direction of the bristles is overlapped with a tangent line passing through the roots of the bristles on the section S.

2. The axial fan according to claim 1, wherein: the bristles are fixedly bonded with the tail edge.

3. The axial fan according to claim 1, wherein: the length-diameter ratio of the bristles ranges from 5:1 to 20:1, and the diameters of the bristles are gradually reduced from the root parts to the tip parts of the bristles.

4. The axial flow fan according to claim 3, wherein: the ratio of the cross-sectional area of the bristles at the position with the largest diameter to the cross-sectional area of the bristles at the position with the smallest diameter is not more than 5: 1.

5. The axial fan according to claim 1, wherein: the cross section of the tail edge is semicircular, and the ratio of the radius of the cross section of the tail edge to the radius of the root of the brush hair is 2:1-4: 1.

6. The axial fan according to claim 1, wherein: the distance between the roots of two adjacent bristles is smaller than the length of the bristles.

7. The axial fan according to claim 1, wherein: the bristles are arranged into two rows along the width direction of the tail edge, and the two rows of bristles are aligned one by one or staggered.

8. The axial fan according to claim 7, wherein: the lengths of all the bristles are consistent; or the length of the back row of bristles is greater than that of the front row of bristles in the two rows of bristles.

9. The axial fan according to claim 1, wherein: the bristles are arranged into three rows along the width direction of the tail edge, and the three rows of bristles are aligned one by one or any two adjacent rows of bristles are arranged in a staggered manner; all the bristles have the same length, or the bristles in the middle of the three rows have the largest length.

10. An air conditioner, characterized in that: an outdoor unit thereof is provided with the axial flow fan according to any one of claims 1 to 9.