CN215909254U - Outdoor unit and air conditioner - Google Patents

Abstract

The utility model provides an outdoor unit and an air conditioner, wherein the outdoor unit comprises a shell and an axial flow fan, the axial flow fan comprises a hub and a plurality of blades, and each blade is provided with a front edge, a tail edge and an outer edge; the tail edge is fixedly provided with a hairbrush-shaped noise reduction part which comprises a plurality of bristles, and the bristles are distributed along the length direction of the tail edge; the axial cylindrical section of the fan where the root parts of the bristles are located is taken as a section S, and an included angle alpha is formed between the tangent of the root parts of the bristles passing through the section S and the extending direction of the bristles. Through set up the part of making an uproar that falls of brush form on axial fan blade trailing edge, when the fan rotated, the brush hair can be along with the air current swing, 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 then reduced axial fan noise.

Description

Outdoor unit and air conditioner

Technical Field

The present invention relates to the field of air conditioning technologies, and in particular, to an outdoor unit of an air conditioner and an air conditioner having the same, which are capable of reducing noise.

Background

Most of the outdoor units of air conditioners adopt axial fans, which inevitably bring running noise in the running process and bring certain noise pollution to people's daily life. 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 operation noise control of the axial flow fan of the outdoor unit.

Therefore, how to effectively reduce the operation noise of the axial flow fan of the outdoor unit has become an urgent technical problem to be solved.

SUMMERY OF THE UTILITY MODEL

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

In some embodiments of the present application, an outdoor unit is provided, the outdoor unit including a casing and an axial flow fan provided in the casing, the axial flow fan including:

a hub;

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 and an outer end of said trailing edge;

the brush-shaped noise reduction component is fixedly arranged on the tail edge and comprises a plurality of bristles which are distributed along the length direction of the tail edge;

the axial cylindrical section of the fan where the root parts of the bristles are located is taken as a section S, and an included angle alpha is formed between a tangent line passing through the root parts of the bristles on the section S and the extending direction of the bristles.

The brush-shaped noise reduction component is arranged on the tail edge of the axial flow fan blade, and the bristles have certain softness, so that when the fan rotates, a plurality of bristles can swing to a certain degree along with airflow, so that the outlet airflow can be effectively smoothed, a rectification effect is achieved, large fluctuation of the outlet airflow is reduced, namely sudden change of the outlet airflow is reduced, and the sudden change of the airflow is an important source of running noise of the axial flow fan, so that the noise of the axial flow fan can be effectively reduced, and the running noise of an outdoor unit is reduced; meanwhile, the axial cylindrical section of the fan where the root parts of the bristles are located is taken as the section S, the tangent line of the root part of the bristles passing through the section S is the straight line where the air flow direction of the outlet of the root point of the bristles is located, an included angle alpha is formed between the tangent line and the extending direction of the bristles, the extending direction of the bristles is not overlapped with the air flow direction of the outlet of the root point of the bristles, and the bristles can apply resistance to the air flow of the outlet, so that the fluctuation of the air flow of the outlet at the position is further reduced, and the noise reduction effect is further enhanced.

In some embodiments of the present application, the aspect ratio of the bristles ranges from 5 to 10, 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, a plurality of the bristles are arranged in a plurality of rows along a width direction of the trailing edge, and each row of bristles includes a plurality of bristles arranged along a length direction of the trailing edge.

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

In some embodiments of the present application, all of the bristles are of uniform length, or the bristles in the back row are longer than the bristles in the front row in both rows.

In some embodiments of the present application, when the plurality of bristles are arranged in three rows along the width direction of the trailing edge, the three rows of bristles are aligned one by one or any two adjacent rows of bristles are arranged in a staggered manner.

In some embodiments of the present application, when any two adjacent rows of bristles are misaligned, the last row of bristles is aligned with the first row of bristles.

In some embodiments of the present application, all of the bristles are uniform in length; or the length of the bristles in the middle row is the largest among the three rows of bristles.

In some embodiments of the present application, an air conditioner is also provided, which includes the outdoor unit.

Drawings

Fig. 1 is a perspective view illustrating an outdoor unit according to an embodiment;

fig. 2 is a perspective view illustrating an axial flow fan of an outdoor unit according to an embodiment;

FIG. 3 is an elevation view A of FIG. 2;

FIG. 4 is a front view in the direction B of FIG. 2;

fig. 5 is an enlarged view of the portion C of fig. 4.

Reference numerals: 100-a housing; 200-axial fan; 210-a hub; 220-blade; 221-leading edge; 222-trailing edge; 223-outer edge; 230-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 the indoor heat exchanger (in the indoor unit, the evaporator at the moment) to be in an ultralow pressure state, liquid refrigerant in the indoor heat exchanger is rapidly evaporated to absorb heat, air blown out by the fan is cooled by the coil pipe of the indoor heat exchanger to become cold air which is blown into a room, the evaporated and vaporized refrigerant is compressed by the compressor, is condensed into liquid in a high-pressure environment in the outdoor heat exchanger (in the outdoor unit, the condenser at the moment) to release heat, and the heat is dissipated into the atmosphere through the fan of the outdoor unit, 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 5, 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 100 and an axial flow fan 200 provided in the casing 100, and may further include a compressor, an outdoor heat exchanger, an expander, and the like of a refrigeration cycle. The axial flow fan 200 includes a hub 210 and a plurality of blades 220, the plurality of blades 220 are arranged at intervals along the circumferential direction of the hub 210, in this embodiment, three blades 220 are uniformly distributed along the circumferential direction as an example, and the blades 220 have a leading edge 221, a trailing edge 222, and an outer edge 223 connecting the outer end of the leading edge 221 and the outer end of the trailing edge 222; the trailing edge 222 is fixedly provided with a brush-shaped noise reduction member, the brush-shaped noise reduction member comprises a plurality of bristles 230, the plurality of bristles 230, i.e. all the bristles 230, are arranged along the length direction of the trailing edge 222, and the bristles 230 are linear bristles in this embodiment. Through set up the brush form on trailing edge 230 and fall the part of making an uproar, because brush hair 230 has certain softness, when the fan rotates, its a plurality of brush hairs 230 can have certain swing along with the air current, and then can smooth the export air current effectively, reduce the big fluctuation of export air current, reduce the 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 230 at different radii on the trailing edge 222 (i.e., the connecting ends of the bristles 230 and the trailing edge 222) are different, and for convenience of description, any axial cylindrical section of the fan is denoted as section S. Taking one of the bristles 230 as an example, the axial cylindrical section of the fan (i.e. the dashed circle in fig. 4 and 5) where the root of the bristle 230 is located has an angle α with the extension direction of the bristle 230, and the tangent line (i.e. the solid line a in fig. 4 and 5) passing through the root of the bristle 230 on the section S. 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, and the tangent line and the extension direction of the bristles form an included angle alpha, namely the extension direction of the bristles is not overlapped with the outlet airflow direction of the root point of the bristles, the bristles can apply resistance to the outlet airflow, so that the fluctuation of the outlet airflow at the position is further reduced, and the noise reduction effect is further enhanced.

Specifically, the bristles 230 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 bristles 230 can be made of a polymeric material, such as polypropylene, silica gel or a rubber material, can be made into a strip-shaped whole body and comprise a strip-shaped soft base plate, and the bristles 230 are all fixedly arranged on the soft base plate and are fixedly arranged on the tail edge 222 in a bonding mode basically through the softness.

In order to reduce the weight of the bristles 230 as much as possible so that the bristles 230 can oscillate with the fan to a certain extent to smooth the outlet airflow, the bristles 230 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 230 in this embodiment is in the range of 5 to 10, and the diameter of the bristles 230 is gradually reduced from the root thereof to the tip thereof (i.e., the free end) like a needle shape, as a result of experimental simulation. Meanwhile, the distance between the roots of any two adjacent bristles 230 should be smaller than the length of the bristles 230 so as to ensure the distribution density, and the discretized vortex can be better realized only by higher distribution density.

Further, as a result of experimental simulation, the ratio of the cross-sectional area of the bristle 230 where the diameter is the largest (i.e., the root) to the cross-sectional area of the bristle where the diameter is the smallest (i.e., the tip) is not more than 5: 1.

Since the outlet airflow is primarily concentrated on the portion of the trailing edge 222 near the outer edge 223, the bristles 230 are correspondingly primarily concentrated on the portion of the trailing edge 222 near the outer edge 223, as shown in fig. 2-4, with the bristles 230 being primarily concentrated at the arc 2/3 from the outer end of the trailing edge 222 inward to the trailing edge 222.

When the thickness of the blade 220 is larger and the size of the blade 220 is larger, the number of the bristles 230 is preferably correspondingly increased, in this case, the bristles 230 are arranged in a plurality of rows along the width direction of the trailing edge 230 in addition to the length direction of the trailing edge 222, and each row of bristles 230 includes a plurality of bristles 230 arranged along the length direction of the trailing edge 222. Because of the limited width of the trailing edge 230, the rows of bristles 230 are preferably two or three rows.

When all the bristles 230 are arranged in two rows in the width direction of the trailing edge 222, the bristles 230 of one row are aligned with or misaligned from the bristles 230 of the other row. When the lengths of all the bristles 230 are uniform, or when the lengths of the two rows of bristles 230 are not uniform, the length of the rear row of bristles 230 (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 230 (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 230 and then further rectified by the rear row of bristles 230, so that the rectification effect on the air flow is improved.

Similarly, when all the bristles 230 are arranged in three rows along the width direction of the trailing edge 222, the three rows of bristles are aligned one-to-one or any two adjacent rows of bristles are arranged in a staggered manner. When any two adjacent rows of bristles 230 are staggered, the bristles 230 in the last row are aligned with the bristles 230 in the first row.

In addition, all of the bristles 230 are uniform in length; or the three rows 230, the length of the bristles in the middle row is the greatest, and is greater than the length of the bristles 230 in the rear and front rows. The air flows on the two sides respectively flow through the rear row of brush bristles 230 and the front row of brush bristles 230 and then are rectified again through the middle row of brush bristles 230, that is, 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 (10)

1. An outdoor unit comprising a casing and an axial flow fan provided in the casing, the axial flow fan comprising:

a hub;

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 and an outer end of said trailing edge;

the method is characterized in that: the brush-shaped noise reduction component is fixedly arranged on the tail edge and comprises a plurality of bristles which are distributed along the length direction of the tail edge;

the axial cylindrical section of the fan where the root parts of the bristles are located is taken as a section S, and an included angle alpha is formed between a tangent line passing through the root parts of the bristles on the section S and the extending direction of the bristles.

2. The outdoor unit of claim 1, wherein: the aspect ratio of the bristles ranges from 5 to 10, and the diameter of the bristles gradually decreases from the root to the tip of the bristles.

3. The outdoor unit of claim 2, 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.

4. The outdoor unit of claim 1, wherein: the bristles are arranged in multiple rows along the width direction of the tail edge, and each row of bristles comprises multiple bristles arranged along the length direction of the tail edge.

5. The outdoor unit of claim 4, wherein: when the bristles are arranged in two rows along the width direction of the tail edge, the bristles in the two rows are aligned one by one or staggered.

6. The outdoor unit of claim 5, wherein: all the bristles are of the same length, or the length of the bristles in the back row is greater than that in the front row in the two rows.

7. The outdoor unit of claim 5, wherein: when the bristles are arranged in three rows along the width direction of the tail edge, the three rows of bristles are aligned one by one or any two adjacent rows of bristles are arranged in a staggered manner.

8. The outdoor unit of claim 7, wherein: when any two adjacent rows of bristles are arranged in a staggered manner, the bristles in the last row are aligned with the bristles in the foremost row one by one.

9. The outdoor unit of claim 7, wherein: the lengths of all the bristles are consistent; or the length of the bristles in the middle row is the largest among the three rows of bristles.

10. An air conditioner, characterized in that: comprising the outdoor unit of any one of claims 1 to 9.

Images