CN216203866U - Air conditioner - Google Patents

Abstract

The utility model provides an air conditioner, which solves the problem that an axial flow fan of the air conditioner in the prior art is high in noise. The air conditioner comprises an outdoor unit, the outdoor unit comprises a shell and an axial flow fan, the axial flow fan comprises a hub and a plurality of blades, and the blades are provided with a front edge, an outer edge, blade roots, a pressure surface and a suction surface; the noise reduction assembly is fixedly arranged on the front edge and comprises a plurality of front edge bristles, the front edge bristles are distributed along the length direction of the front edge, the front edge bristles extend towards the side where the pressure surface is located in a bending mode, and a gap is formed between the front edge bristles and the pressure surface. The noise reduction assembly is arranged on the front edge of the axial flow fan blade and comprises a plurality of front edge bristles, when the fan rotates, the front edge bristles can swing to a certain degree along with the airflow, the inlet airflow can be effectively smoothed, the large fluctuation of the inlet airflow is reduced, namely, sudden change of the inlet airflow is reduced, a better inflow foundation is provided for subsequent airflow, the noise of the axial flow fan is reduced, and further, the running noise of an outdoor unit and an air conditioner is reduced.

Description

Air conditioner

Technical Field

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

Background

Most of air conditioners adopt axial flow fans, which inevitably accompany with operation noise in the operation 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 control of the running noise of the axial flow fan of the air conditioner.

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

SUMMERY OF THE UTILITY MODEL

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

In some embodiments of the present application, an air conditioner is provided, which includes an outdoor unit including a casing and an axial flow fan disposed in the casing, the axial flow fan including a hub and a plurality of blades arranged at intervals in a circumferential direction of the hub, the blades having a leading edge, an outer edge, a blade root, a pressure surface, and a suction surface; the noise reduction assembly is fixedly arranged on the front edge and comprises a plurality of front edge bristles, the front edge bristles are distributed along the length direction of the front edge, the root parts of the front edge bristles are fixedly arranged on the front edge and extend towards the side where the pressure surface is located in a bending mode, and gaps are formed between the front edge bristles and the pressure surface.

The noise reduction component is arranged on the front edge of the axial flow fan blade and comprises a plurality of front edge bristles, the front edge bristles are fixedly arranged on the front edge at the root parts and extend towards the side where the pressure surface is located in a bending mode, gaps exist between the front edge bristles and the pressure surface, namely the front edge bristles extend to the front side of the pressure surface and are not attached to the pressure surface, meanwhile, due to the fact that the bristles have certain softness, when the fan rotates, the front edge bristles can swing to a certain degree along with airflow, and therefore inlet airflow can be effectively smoothed, the rectification effect is achieved, large fluctuation of the inlet airflow is reduced, namely, sudden change of the inlet airflow is reduced, a good inflow foundation is provided for follow-up airflow, and the sudden change of the airflow is an important source of running noise of the axial flow fan, and accordingly noise of the axial flow fan can be effectively reduced, and running noise of an outdoor unit and an air conditioner is reduced.

In some embodiments of the present application, the leading edge bristles have an aspect ratio in the range of 5 to 20.

In some embodiments of the present application, the leading edge bristles taper in diameter from their root to their tip.

In some embodiments of the present application, the ratio of the cross-sectional area at the point where the diameter of the leading edge bristles is largest to the cross-sectional area at the point where the diameter is smallest is no greater than 5: 1.

In some embodiments of the present application, a plurality of the leading edge bristles are arranged in 2-3 rows along the front-to-rear width of the leading edge, each row of leading edge bristles including a plurality of leading edge bristles running along the length of the leading edge.

In some embodiments of the present application, when a plurality of the leading edge bristles are arranged in two rows along the front-rear width direction of the leading edge, all the leading edge bristles have the same length; or the length of the front edge bristles in the back row is greater than that of the front edge bristles in the front row.

In some embodiments of the present application, when a plurality of the leading edge bristles are arranged in three rows in the front-rear width direction of the leading edge, all the leading edge bristles have the same length; or the length of the front edge brush hair in the middle row is the largest in the three rows of front edge brush hair.

In some embodiments of the present application, the trailing edge has a plurality of leading edge bristles disposed along its length.

Drawings

FIG. 1 is a front view of an axial flow fan of an air conditioner according to an embodiment in which only a front edge is provided with bristles;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

FIG. 3 is a front view of an axial flow fan of an air conditioner according to an embodiment in which bristles are provided at both a leading edge and a trailing edge thereof;

fig. 4 is a sectional view taken along line B-B of fig. 3.

Reference numerals: 100-axial fan; 110-a hub; 120-blades; 121-leading edge; 122-trailing edge; 123-outer edge; 124-blade root; 125-pressure surface; 126-suction side; 130-leading edge bristles; 140-trailing edge 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 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 the fan is cooled by the coil pipe of the indoor heat exchanger 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 the outdoor heat exchanger (in an air conditioner, the condenser at the moment) to release heat, and the heat is dissipated into the atmosphere through the fan of the air conditioner, so that the refrigeration effect is achieved through 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 and 2, 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, an outer edge 123, a blade root 124, a pressure surface 125 and a suction surface 126, the outer edge 123 connects the outer end of the leading edge 121 and the outer end of the trailing edge 122, the blade root 124 connects the inner end of the leading edge 121 and the inner end of the trailing edge 122, and is the connection part of the blade 120 and the hub 110; the front edge 121 is fixedly provided with a noise reduction assembly, the noise reduction assembly comprises a plurality of front edge bristles 130 distributed along the length direction of the noise reduction assembly, the front edge bristles 130 are fixedly arranged on the front edge 121 by the root parts (namely, the connecting ends fixedly connected with the front edge 121) and extend to the side where the pressure surface 125 is located, and a gap is formed between the front edge bristles 130 and the pressure surface 125.

Specifically, the front edge bristles 130 extend forward of the pressure surface 125, and the bent portion is bent approximately 90 ° so as to be approximately parallel to the pressure surface 125, as shown in fig. 2, thereby following the direction of the airflow on the pressure surface 125. Through set up the subassembly of making an uproar on leading edge 121, a plurality of leading edge brush hair 130 of the subassembly of making an uproar have certain softness, and buckle to the pressure surface 125 front side, when the fan rotates, leading edge brush hair 130 can have certain degree of swing along with the pressure surface air current, and then can smooth leading edge 121 department entry air current effectively, reduce the big fluctuation of entry air current, reduce the entry 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 reduce off-premises station noise of operation.

Specifically, the front edge 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, the front edge brush bristles 130 can be made of a polymer material, such as polypropylene, silica gel or a rubber material, the noise reduction assembly can be a strip-shaped whole body and comprise a strip-shaped soft base plate, the front edge brush bristles 130 are fixedly arranged on the soft base plate and are fixedly arranged on the front edge 121 in a bonding mode basically through the softness, or the front edge brush bristles 130 are directly bonded on the front edge 121.

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

Further, experimental simulations have shown that the ratio of the cross-sectional area of the leading edge bristles 130 at the point of maximum diameter (i.e., root) to the cross-sectional area at the point of minimum diameter (i.e., tip) is no greater than 5: 1.

Since the inlet airflow is primarily concentrated on the portion of leading edge 121 near outer edge 123, leading edge bristles 130 are correspondingly primarily concentrated on the portion of leading edge 121 near outer edge 123, as shown in figures 1-3, leading edge bristles 130 are primarily concentrated at the arc 2/3 from the outer end of leading edge 121 inward to leading edge 121.

When the thickness of the blade 120 is larger and the size of the blade 120 is larger, the number of the front edge bristles 130 is preferably correspondingly increased, at this time, the front edge bristles 130 are arranged along the length direction of the front edge 121, and are also arranged in multiple rows along the width direction of the front edge 121, and each row of the front edge bristles 130 comprises a plurality of front edge bristles 130 arranged along the length direction of the front edge 121. Because of the limited width of the leading edge 121, the rows of leading edge bristles 130 are preferably two or three rows.

When all the front edge bristles 130 are arranged in two rows along the width direction of the front edge 121, the front edge bristles 130 in one row are aligned with or misaligned from the front edge bristles 130 in the other row. Where all of the leading edge bristles 130 are of uniform length, or where the two rows of leading edge bristles 130 are of non-uniform length, the length of the trailing row of leading edge bristles 130 (i.e., closer to the back, suction side, of the blade) should be greater than the length of the leading edge bristles 130 (i.e., closer to the front, pressure side, of the blade). The inlet airflow is rectified by the front row of front edge bristles 130 and then further rectified by the rear row of front edge bristles 130, so that the rectifying effect on the airflow is improved.

Similarly, when all the front edge bristles 130 are arranged in three rows along the width direction of the front edge 121, the front edge bristles in the three rows are aligned one by one or any two adjacent rows are arranged in a staggered manner. When any two adjacent rows of leading edge bristles 130 are staggered, the leading edge bristles 130 in the last row are aligned with the leading edge bristles 130 in the foremost row.

In addition, all leading edge bristles 130 are of uniform length; or the length of the front edge bristles 130 in the middle row is the largest and is greater than the length of the front edge bristles 130 in the back row and the front row. The air flows on the two sides respectively flow through the front edge brush bristles 130 of the rear row and the front edge brush bristles 130 of the front row and then are rectified again through the front edge brush bristles 130 of the middle row, namely, the inlet air flow of the pressure surface is rectified by the front edge brush bristles of the front row and then rectified by the middle row, and the inlet air flow of the suction surface is rectified by the front edge brush bristles of the rear row 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.

To further reduce the noise of the axial fan 100, referring to fig. 3 and 4, a plurality of trailing edge bristles 140 are also disposed on the trailing edge 122 of the blade 120, and all the trailing edge bristles 140 are arranged along the length direction of the trailing edge 122 and extend toward the outlet airflow direction at the trailing edge 122. By arranging the trailing edge brush bristles 140 on the trailing edge 140, the outlet airflow at the trailing edge 122 can be effectively smoothed, abrupt change of the outlet airflow is reduced, and the running noise of the axial flow fan is further reduced. The material and the arrangement of the trailing edge bristles 140 are the same as those of the leading edge bristles 130, and will not be described herein.

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 (8)

1. An air conditioner comprises an outdoor unit, wherein the outdoor unit comprises a shell and an axial flow fan arranged in the shell, the axial flow fan comprises a hub and a plurality of blades distributed at intervals along the circumferential direction of the hub, and the blades are provided with a front edge, a tail edge, an outer edge, a blade root, a pressure surface and a suction surface;

the method is characterized in that: the noise reduction assembly is fixedly arranged on the front edge and comprises a plurality of front edge bristles, the front edge bristles are distributed along the length direction of the front edge, the root parts of the front edge bristles are fixedly arranged on the front edge and extend towards the side where the pressure surface is located in a bending mode, and gaps are formed between the front edge bristles and the pressure surface.

2. The air conditioner according to claim 1, wherein: the length-diameter ratio of the front edge brush hair is 5-20.

3. The air conditioner according to claim 2, wherein: the diameter of the front edge brush hair is gradually reduced from the root of the front edge brush hair to the tip of the front edge brush hair.

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

5. The air conditioner according to claim 1, wherein: the front edge bristles are arranged in 2-3 rows along the front and back width directions of the front edge, and each row of the front edge bristles comprises a plurality of front edge bristles arranged along the length direction of the front edge.

6. The air conditioner according to claim 5, wherein: when a plurality of front edge bristles are arranged into two rows along the front and rear width directions of the front edge, the lengths of all front edge bristles are consistent; or the length of the front edge bristles in the back row is greater than that of the front edge bristles in the front row.

7. The air conditioner according to claim 5, wherein: when the front edge bristles are arranged in three rows along the front and rear width directions of the front edge, the lengths of all the front edge bristles are consistent; or the length of the front edge brush hair in the middle row is the largest in the three rows of front edge brush hair.

8. The air conditioner according to claim 1, wherein: and a plurality of tail edge bristles are distributed on the tail edge along the length direction of the tail edge.

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