CN111442379A

CN111442379A - Laminar flow fan and ceiling type air conditioner indoor unit

Info

Publication number: CN111442379A
Application number: CN201910045835.1A
Authority: CN
Inventors: 闫宝升; 李英舒; 王晓刚; 吕静静; 单翠云; 王鹏臣
Original assignee: Qingdao Haier Air Conditioner Gen Corp Ltd
Current assignee: Qingdao Haier Air Conditioner Gen Corp Ltd
Priority date: 2019-01-17
Filing date: 2019-01-17
Publication date: 2020-07-24

Abstract

The invention provides a laminar flow fan and a ceiling type air conditioner indoor unit. Wherein, laminar flow fan includes: the annular disks are arranged in parallel at intervals, fixedly connected and arranged with collinear axes; the motor is used for driving the plurality of annular disks to rotate so as to suck outside air into a radial central area of the plurality of annular disks from one axial side of the plurality of annular disks and blow the outside air out along the radial direction of the plurality of annular disks; at least part of the surface of the annular disc is provided with a plurality of convex parts so as to enhance the turbulent flow of the airflow on the surface layer of the annular disc and reduce the integral noise of the laminar flow fan.

Description

Laminar flow fan and ceiling type air conditioner indoor unit

Technical Field

The present invention relates to the field of air conditioning technology, and in particular, to a laminar flow fan 300 and a ceiling type air conditioning indoor unit.

Background

With the development of society and the increasing living standard of people, various air conditioning devices have become one of the indispensable electrical devices in people's daily life. Various air conditioning devices can help people to reach a temperature that can be adapted to when the ambient temperature is too high or too low.

The current air conditioning devices mainly include various types of air conditioners and fans, but most users consider that hot air or cold air generated by the current air conditioners is unevenly distributed in a room or a closed space, and has certain distribution limitations. In addition, fans used in indoor units of air conditioners are mainly centrifugal fans and cross-flow fans. However, the centrifugal fan and the cross flow fan have the following problems: the centrifugal fan has high noise because the wind pressure and the wind volume are improved by dozens of large-volume blades, and when the centrifugal fan is used for a vertical air conditioner, the air needs to be turned in two directions of 90 degrees from the air entering the centrifugal fan to the air being sent out of the air conditioner, and the wind volume loss occurs at each direction turning; although the noise of the cross flow fan is low, the wind pressure is too small, and the air supply distance is short. And the whole volume of the cross flow fan is large, and the actual effective volume is small, so that the space waste is caused.

Disclosure of Invention

An object of the present invention is to provide a laminar flow fan with a high air volume, which is better applied to an air conditioner.

It is a further object of the present invention to reduce the noise of laminar flow fans and eliminate the noise.

Another object of the present invention is to provide a ceiling type indoor unit of an air conditioner to which a laminar flow fan is applied.

In one aspect, the present invention provides a laminar flow fan comprising:

the annular disks are arranged in parallel at intervals, fixedly connected and arranged with collinear axes; and

the motor is used for driving the plurality of annular disks to rotate so as to suck outside air into a radial central area of the plurality of annular disks from one axial side of the plurality of annular disks and blow the outside air out along the radial direction of the plurality of annular disks;

at least part of the surface of the annular disc is provided with a plurality of convex parts so as to enhance the turbulent flow of the airflow on the surface layer of the annular disc and reduce the integral noise of the laminar flow fan.

Optionally, each annular disc is provided with a plurality of bosses.

Optionally, the surface of each annular disc facing only the air inlet side of the laminar flow fan is provided with a plurality of protrusions.

Optionally, the plurality of protrusions are arranged in multiple layers along the radial direction of the annular disk; each layer has the same number of projections and the projections of each layer are arranged on a circumference concentric with the annular disc.

Optionally, each boss is hemispherical; the diameters of the convex parts of different annular disks are different, and the diameters of the convex parts of the annular disks are gradually reduced from the direction close to the air inlet side of the laminar flow fan to the direction far away from the air inlet side.

Optionally, the laminar flow fan further comprises a circular disk, which is outside the annular disk at the outermost side and is fixedly connected with the annular disk, and a plurality of convex parts are formed on the inner surface of the circular disk; the rotating shaft of the motor is connected to the inner side of the circular disc to drive the circular disc to rotate.

Optionally, the laminar flow fan further comprises a plurality of connecting rods, each connecting rod penetrating through the circular disk and the plurality of annular disks to fixedly connect the plurality of annular disks to the circular disk.

Optionally, for the plurality of annular disks, in a direction from the air inlet side to the other side, the distance between two adjacent annular disks gradually increases.

In another aspect, the present invention also provides a ceiling type air conditioner indoor unit, comprising: the top of the shell is used for being fixed on a roof, the bottom of the shell is provided with an air inlet, and the side of the shell is provided with at least one air supply outlet; the heat exchanger is arranged in the shell; according to any laminar flow fan, the axis of the laminar flow fan is arranged in the shell in a vertically extending mode, the air inlet side of the laminar flow fan is arranged downwards, and the laminar flow fan is used for enabling indoor air to enter the shell from the air inlet, exchange heat with the heat exchanger and then flow to the air supply outlet.

Alternatively, the heat exchanger is an arc-shaped plate whose axis extends in the vertical direction, which surrounds the laminar flow fan radially outward of the laminar flow fan.

The laminar flow fan realizes laminar flow air supply through the viscous effect between the air and the surface of the annular disc, reduces the use of the traditional fan on the blades, can meet the requirement of air volume even without adding the blades, has low noise and high air volume in the air supply process, and effectively improves the use experience of users.

Further, for the laminar flow fan, a plurality of annular disks are arranged in parallel at intervals. In the rotating air supply process, the noise frequency generated between each annular disk and the peripheral airflow is converged and has strong consistency, and the noise is increased by mutual superposition. The annular disks are provided with the protrusions, so that the surface air flow can be disturbed to a certain extent, the consistency of the noise frequency of the air flow around each annular disk is disturbed, the annular disks are mutually overlapped and eliminated, the integral noise of the laminar flow fan is reduced, and abnormal sound is not generated. In addition, the diameters of the convex parts of different annular disks are different, and the diameters of the convex parts of the annular disks are gradually reduced from the direction close to the air inlet side of the laminar flow fan to the direction far away from the air inlet side, so that the difference of turbulent flow effects of the annular disks is increased, and the air flow noises around different annular disks are ensured to be different from each other.

Furthermore, the interval between each two adjacent annular disks of the laminar flow fan is set to be different, the interval close to the air inlet side is smaller, and the interval far away from the air inlet side is larger, so that the air volume of the laminar flow fan can be effectively improved, and the air outlet of the laminar flow fan meets the use requirements of users.

The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.

Drawings

Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:

fig. 1 is a schematic view of an overall structure of a laminar flow fan according to an embodiment of the present invention;

FIG. 2 is a schematic bottom view of the laminar flow fan of FIG. 1;

FIG. 3 is a schematic diagram of the air supply principle of a laminar flow fan according to an embodiment of the present invention;

FIG. 4 is a velocity profile and force profile of a laminar flow fan according to one embodiment of the present invention;

FIG. 5 is a schematic view of the air circulation of a laminar flow fan according to one embodiment of the present invention;

FIG. 6 is a schematic diagram of gradual pitch change of a plurality of annular disks of a laminar flow fan in relation to air volume and air pressure according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of the relationship between the motor speed and the air volume and the air pressure of the laminar flow fan according to an embodiment of the present invention;

fig. 8 is a schematic side view of a ceiling type air conditioning indoor unit according to an embodiment of the present invention;

fig. 9 is a schematic bottom view of the ceiling type air conditioning indoor unit of fig. 8;

fig. 10 is a sectional view a-a of the ceiling type air conditioner indoor unit of fig. 8.

Detailed Description

A laminar flow fan and a ceiling type air conditioning indoor unit according to an embodiment of the present invention will be described with reference to fig. 1 to 10. Where the orientations or positional relationships indicated by the terms "front," "back," "upper," "lower," "top," "bottom," "inner," "outer," "lateral," and the like are based on the orientations or positional relationships shown in the drawings, the description is for convenience only and to simplify the description, and no indication or suggestion is made that the device or element so indicated must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the invention.

Fig. 1 is a schematic view of an overall structure of a laminar flow fan according to an embodiment of the present invention; fig. 2 is a schematic bottom view of the laminar flow fan shown in fig. 1. Fig. 1 illustrates the wind direction with arrows.

As shown in fig. 1 and 2, a laminar flow fan 300 according to an embodiment of the present invention may generally include a plurality of annular disks 10 and a motor 20. The plurality of annular disks 10 are arranged in parallel at intervals, fixedly connected with each other and arranged with collinear axes. The motor 20 is configured to drive the plurality of annular disks 10 to rotate, so that the air boundary layer 13 near the surfaces of the plurality of annular disks 10 (the air boundary layer 13 is a very thin air layer near the surfaces of the respective annular disks) is driven by the plurality of annular disks 10 to rotate from inside to outside due to a viscous effect to form a laminar air flow. Thus, when the laminar flow fan 300 is operated, the outside air is sucked into a radially central region (i.e., the air intake passage 11 shown in fig. 5) of the plurality of annular disks 10 from one axial side (i.e., the lower side in the embodiment shown in fig. 1) of the plurality of annular disks 10, and is blown out radially outward along the plurality of annular disks 10. The air supply process of the laminar flow fan 300 is low in noise and high in air volume, 360-degree air outlet in the circumferential direction can be achieved, and the laminar flow fan can be matched with an air conditioner or other devices with the air outlet requirements.

Because the plurality of annular disks 10 are arranged in parallel at intervals, the noise frequency generated between each annular disk 10 and the surrounding air flow has strong consistency in the rotating air supply process, and the noise at multiple positions is mutually superposed to increase the overall noise of the fan.

To this end, the present embodiment particularly forms a plurality of protrusions 15 on at least a portion of the surface of annular disk 10, so as to enhance turbulence of airflow on the surface of annular disk 10. By means of turbulence, the consistency of the frequency of the airflow noise around each annular disk 10 is disturbed. Thus, when the noises are superimposed on each other, a part of the noises can be eliminated, so that the whole noises of the laminar flow fan 300 are reduced and no abnormal noise is generated.

Each annular disc 10 may be provided with a protrusion 15 to ensure a better noise reduction effect. Moreover, because the side of the ring disk 10 facing the air inlet side is subjected to a larger wind pressure than the other side, the protrusion 15 is disposed on the surface of each ring disk 10 facing only the air inlet side of the laminar flow fan 300, so as to achieve a better turbulent flow effect. As shown in fig. 1, the annular disk 10 is disposed vertically in the axial direction, and the air enters the laminar flow fan 300 from the bottom to the top, so that the air inlet side is the lower side thereof, the protrusion 15 is disposed on the lower surface of the annular disk 10, and the upper surface of the annular disk 10 is still flat.

A plurality of bosses 15 may be arranged in multiple layers in the radial direction of the annular disk 10, each layer having the same number of bosses 15, and the bosses 15 of each layer being arranged on a circumference concentric with the annular disk 10. For example, as shown in fig. 2, the surface of one annular disk 10 is provided with 3 layers of 20 projections 15. Thus, after the annular disk 10 is rotated, the air flow is disturbed layer by the 3-layer raised portions 15. This ensures that a sufficient turbulence effect is achieved.

Each boss 15 may be hemispherical. The surface of the hemispherical convex part is more round, so that the turbulent flow effect is achieved, and extra new noise is avoided due to the fact that the surface is not provided with edges and corners. The diameters of the convex parts 15 of different annular disks 10 can be different, so that the difference of turbulent flow effects is increased, and the air flow noises around different annular disks 10 are different. Specifically, the closer to the air intake side of the laminar flow fan 300, the higher the intake air pressure, and the farther from the air intake side, the lower the intake air pressure. In order to match the trend of the wind pressure change, the diameter of the convex portion 15 of the annular disk 10 may be gradually reduced from the side close to the air inlet side to the side far from the air inlet side. Taking fig. 1 as an example, the diameter of the protrusion 15 of the ring-shaped disk 10 at the lowest side close to the air inlet side is the largest, and the diameter of the protrusion 15 of the ring-shaped disk 10 at the uppermost side is the smallest.

As shown in fig. 1, the laminar flow fan 300 further includes a circular disk 30. The circular disk 30 is located outside the outermost annular disk 10 (i.e., above the uppermost annular disk 10 shown in fig. 1) and is fixedly connected thereto. The inner surface of the circular disk 30 (i.e., the lower surface of the circular disk 30 shown in fig. 1) is also formed with a plurality of protrusions 15. The motor 20 extends into the air inlet channel 11 at the radial inner side of the plurality of annular disks 10, and the rotating shaft thereof is connected to the circular disk 30 to drive the same to rotate, thereby driving the plurality of annular disks 10 to rotate. The radius of the circular disk 30 and the outer diameter of the plurality of annular disks 10 can be made the same.

The laminar flow fan 300 may also include a plurality of connecting rods 40. Each tie bar 40 may extend through circular disk 30 and plurality of annular disks 10 to connect the plurality of annular disks 10 to circular disk 30. The connecting rods 40 penetrate through the edges of the circular disk 30 and the annular disks 10 at regular intervals to ensure that the connection relationship between the circular disk 30 and the annular disks 10 is stable, so that when the motor 20 drives the circular disk 30 to rotate, the circular disk 30 can stably drive the annular disks 10 to rotate, and the operational reliability of the laminar flow fan 300 is improved.

FIG. 3 is a schematic diagram of the air supply principle of a laminar flow fan according to an embodiment of the present invention; FIG. 4 is a velocity profile and force profile of a laminar flow fan according to one embodiment of the present invention.

As shown in fig. 3 and 4, the blowing principle of the laminar flow fan is mainly derived from a "tesla turbine" found in nigula tesla. Tesla turbines mainly utilize the 'laminar boundary layer effect' or 'viscous effect' of the fluid to achieve the purpose of doing work on 'turbine disks'. In the laminar flow fan of this embodiment, the motor 20 drives the circular disk 30, the circular disk 30 drives the plurality of annular disks 10 to rotate at a high speed, and the air in the gaps between the annular disks 10 contacts and moves with each other, so that the air boundary layer 13 near the surfaces of the annular disks 10 is driven by the rotating annular disks 10 to rotate from inside to outside under the action of the viscous shear force τ to form laminar flow wind.

Fig. 4 shows a schematic diagram of the viscous shear force distribution τ (y) and velocity distribution u (y) to which the air boundary layer 13 is subjected. The viscous shear forces experienced by the air boundary layer 13 are actually the drag forces that the individual disks create against the air boundary layer 13. The axis of abscissa in FIG. 4 refers to the distance in the moving direction of the air boundary layer 13, and the axis of ordinate refers to the direction of the air boundary layer 13 perpendicular to the moving directionUpper height. v. of_eThe velocity of the air flow at each point in the air boundary layer 13, the thickness of the air boundary layer 13, τ_wThe variables y in τ (y) and u (y) refer to the height of the cross-section of boundary layer 13 in the direction perpendicular to the direction of travel, L is the distance between a point on the inner circumference of annular disk 10 and a point on the surface of annular disk 10, then τ (y) is the distribution of viscous shear forces experienced at the height y of the cross-section of boundary layer 13 at this distance L, and u (y) is the velocity distribution at the height y of the cross-section of boundary layer 13 at this distance L.

FIG. 5 is a schematic view of the air circulation of a laminar flow fan according to one embodiment of the present invention. As shown in fig. 5, the radial centers of the plurality of annular disks 10 collectively form an air intake passage 11 for allowing air outside the laminar flow fan 300 to enter. A plurality of air outlets 12 are formed in gaps between the plurality of annular disks 10 to allow laminar air to be blown out. The process of the laminar wind formed by the air boundary layer 13 rotating from inside to outside is centrifugal motion, so that the speed of the laminar wind leaving the air outlet 12 is higher than that of the laminar wind entering the air inlet channel 11.

In some embodiments, for a plurality of annular disks 10, the distance between two adjacent annular disks 10 gradually increases from the air inlet side to the other side (the side opposite to the air inlet side). As shown in fig. 5, the distance between two adjacent annular disks 10 gradually increases from bottom to top. The inventor finds that the arrangement can effectively improve the air volume of the laminar flow fan 300 through a plurality of experiments. The variation of the distance between two adjacent annular disks 10 can be the same, that is, the distance between two adjacent annular disks 10 increases from bottom to top by the same value. For example, the distances between two adjacent annular disks 10 in the 8 annular disks 10 may be sequentially set from bottom to top as follows: 13.75mm, 14.75mm, 15.75mm, 16.75mm, 17.75mm, 18.75mm and 19.75mm, and the distance between two adjacent annular disks 10 is increased by 1mm from bottom to top. It should be noted that the specific values of the variation of the spacing between two adjacent annular disks 10 are only examples, and are not limiting to the present invention.

The air outlets 12 formed by the gaps among the annular disks 10 can enable the laminar flow fan to uniformly supply air for 360 degrees, various uncomfortable symptoms caused by direct blowing of air supplied by an air conditioner are avoided for a user, and the use experience of the user is further improved.

Fig. 6 is a schematic diagram illustrating a relationship between a gradual change of a pitch of a plurality of annular disks 10 of an annular disk 10 of a laminar flow fan and an air volume and an air pressure according to an embodiment of the present invention. The abscissa axis shading uniform expansion disc distance increment refers to the variation of the distance between two adjacent annular discs 10 along the direction from bottom to top, the left ordinate axis Mass flow rate refers to the air volume, the right ordinate axis Pressure refers to the air Pressure, and the air Pressure refers to the Pressure difference between the air outlet 12 of the laminar flow fan and the inlet of the air inlet channel 11. Also, the variation amount of the pitch between two adjacent annular disks 10 is the same, that is, the increase or decrease of the pitch between two adjacent annular disks 10 is the same.

Specifically, fig. 6 is a schematic diagram illustrating the relationship between the gradual change of the pitch of the plurality of ring disks 10 and the air volume and the air pressure when the outer diameter, the inner diameter, the number, the thickness of the ring disks 10 and the rotation speed of the motor 20 of the laminar flow fan are all kept constant. As shown in fig. 6, when all the above mentioned parameters are kept unchanged, the distance between every two adjacent annular disks 10 in the plurality of annular disks 10 gradually changes from bottom to top, which has a large influence on the air volume and a small influence on the air pressure. When the variation of the distance between two adjacent annular disks 10 along the direction from bottom to top, which is represented by the abscissa axis, is a positive number, it indicates that the distance between every two adjacent annular disks 10 in the plurality of annular disks 10 gradually increases from bottom to top; when the variation of the spacing between two adjacent annular disks 10 along the direction from bottom to top, which is represented by the abscissa axis, is a negative number, it indicates that the spacing between every two adjacent annular disks 10 in the plurality of annular disks 10 gradually decreases from bottom to top. As can be seen from fig. 6, when the variation of the distance between every two adjacent annular disks 10 in the plurality of annular disks 10 is-1 mm, 1mm and 2mm, the air volume and the air pressure of the laminar flow fan are both greatly improved. The air volume and the air pressure of the laminar flow fan are comprehensively considered, and the distance between every two adjacent annular disks 10 in the plurality of annular disks 10 is gradually increased from bottom to top. In an embodiment, the outer diameter of the ring disk 10 of the laminar flow fan is 175mm, the inner diameter of the ring disk 10 is 115mm, the number of the ring disks 10 is 8, the thickness of the ring disk 10 is 2mm, and the rotation speed of the motor 20 is 1000rpm (revolutions per minute), at this time, the air volume and the air pressure of the laminar flow fan are considered comprehensively, and the distance between two adjacent ring disks 10 in the 8 ring disks 10 can be set sequentially from bottom to top: 13.75mm, 14.75mm, 15.75mm, 16.75mm, 17.75mm, 18.75mm and 19.75mm, namely, the distance between two adjacent annular disks 10 increases by 1mm from bottom to top. It should be noted that, the distance between two adjacent annular disks 10 in the plurality of annular disks 10 gradually increases from bottom to top, which means that the distance between two adjacent annular disks 10 gradually increases along the direction of the airflow flowing in the air inlet channel 11.

Fig. 7 is a schematic diagram of the relationship between the rotation speed of the motor 20 of the laminar flow fan and the air volume and the air pressure according to an embodiment of the present invention. Wherein the Speed of revolution of the abscissa axis refers to the rotational Speed of the motor 20, the Mass flow rate of the left ordinate axis refers to the air volume, and the Pressure of the right ordinate axis refers to the air Pressure. Specifically, fig. 7 is a schematic diagram illustrating the relationship between the rotation speed of the motor 20 and the air volume and the air pressure when the outer diameter, the inner diameter, the number of layers, the distance, and the thickness of the ring-shaped disk 10 of the laminar flow fan are all kept constant. As shown in fig. 7, when the above mentioned parameters are kept constant, the air volume increases approximately linearly with the increase of the rotation speed of the motor 20, but the increase of the speed tends to be slow, and the increase of the air pressure is basically unchanged. That is, for the same laminar flow fan, the air volume increases approximately linearly as the rotation speed of the motor 20 increases. In a preferred embodiment, the outer diameter of the annular disk 10 of the laminar flow fan is 175mm, the inner diameter of the annular disk 10 is 115mm, the number of the annular disks 10 is 8, and the distance between two adjacent annular disks 10 is sequentially set from bottom to top: 13.75mm, 14.75mm, 15.75mm, 16.75mm, 17.75mm, 18.75mm, 19.75mm, when the thickness of the annular disc 10 is 2mm, the linear relation between the rotating speed of the motor 20 and the air volume of the laminar flow fan is more obvious.

Since the rotation speed of the motor 20 and the air volume of the laminar flow fan are approximately linear, in a preferred embodiment, the motor 20 may be further configured to: the rotating speed of the motor 20 is determined according to the acquired target air volume of the laminar flow fan. That is, the target air volume of the laminar flow fan may be first obtained, and then the rotation speed of the motor 20 may be determined according to a linear relationship between the target air volume and the rotation speed of the motor 20. The target air volume may be obtained by an input operation of the user.

The invention also provides a ceiling type air conditioner indoor unit, which forms a vapor compression refrigeration cycle system together with an air conditioner outdoor unit (not shown) to realize refrigeration/heating of indoor environment.

Fig. 8 is a schematic side view of a ceiling type air conditioning indoor unit according to an embodiment of the present invention; fig. 9 is a schematic bottom view of the ceiling type air conditioning indoor unit of fig. 8; fig. 10 is a sectional view a-a of the ceiling type air conditioner indoor unit of fig. 8.

As shown in fig. 8 to 10, a ceiling type air conditioning indoor unit according to an embodiment of the present invention may generally include a case 100, a heat exchanger 400, and a laminar flow fan 300.

The ceiling-mounted type air conditioning indoor unit is integrally installed under an indoor roof (the roof is illustrated by dotted lines in fig. 8), the top of the casing 100 is used to be fixed to the roof, and the rest of the air conditioning indoor unit is exposed under the roof.

The housing 100 has an air inlet 110 at the bottom and at least one air blowing opening 120 at the side. The number of the air blowing ports 120 may be one or more. As shown in fig. 9, the casing 100 has a square structure, and four air blowing ports 120 are arranged along the circumferential direction of the casing 100 to blow air in four directions. Of course, more air supply ports 120 may be arranged along the circumferential direction of the casing 100 to supply air in more directions. Even, the casing 100 may be circular, and the air supply opening 120 may be formed at a circumferential full angle for air supply, so as to realize 360 ° all-directional air supply. In addition, because of the higher mounted position of the indoor unit of the ceiling type air conditioner, the air-out coverage range is also very large, the refrigerating/heating speed is favorably improved, and the user feels more comfortable. An air guide plate 121 may be disposed at each of the air blowing ports 120 to open and close the air blowing ports 120. The air guiding plate 121 can be controlled to guide the air outlet angle in a rotating manner around a horizontal axis.

The heat exchanger 400 may be an evaporator of a vapor compression refrigeration cycle, which is disposed within the casing 100 (see fig. 10). After the indoor air enters the casing 100 from the air inlet 110, the indoor air is heat-exchanged with the heat exchanger 400 to become heat-exchanged air (the heat-exchanged air is cold air during cooling, and the heat-exchanged air is hot air during heating) and flows to the air supply outlet 120, so that the indoor cooling/heating is realized.

The laminar flow fan 300 is disposed in the casing 100 with its axis extending in a vertical direction and its air inlet side facing downward, and is configured to promote indoor air to flow upward from the air inlet 110 into the casing 100, exchange heat with the heat exchanger 400, and then flow toward the air outlet 120.

Referring to fig. 10, the heat exchanger 400 may be an arc plate whose axis extends in the vertical direction (considering the manufacturing process, it is not an entire arc, but an optimal arc), and may be disposed close to the radially inner side of the plurality of annular disks 10, so that it is closer to the annular disks 10, and is more favorable for absorbing the airflow from the heat exchanger 400.

In some embodiments, as shown in fig. 8 to 10, the ceiling type air conditioning indoor unit further includes a baffle 200. The diaphragm 200 is disposed under the casing 100 with a top surface thereof forming a gap with a bottom surface of the casing 100. One function of the baffle 200 is to guide indoor air from all around the periphery of the baffle 200 to the intake vent 110 through a gap between the baffle 200 and the casing 100. Compared with the scheme that wind directly enters the casing 100 from the bottom of the casing 100 vertically and upwards, the deflector 200 provided by the embodiment of the invention enables the bottom appearance (the bottom of the ceiling type indoor unit mainly faces to users) of the ceiling type indoor unit to be more attractive, and avoids the influence on the appearance caused by the arrangement of a complex air inlet grille on the bottom of the casing 100. Moreover, the air inlet direction is close to the horizontal direction, the air outlet direction is also close to the horizontal direction, and the included angle between the air inlet direction and the air outlet direction is smaller, so that the energy consumption and the noise of the fan are reduced.

As shown in fig. 8 and 10, the baffle 200 may have a tapered guide slope 201 gradually inclined downward from the center thereof to the periphery thereof to guide indoor air. After entering the gap between the diaphragm 200 and the housing 100 from the periphery of the diaphragm 200, the indoor air is guided by the tapered guiding slope 201 to gradually flow obliquely upward to facilitate the indoor air to enter the air inlet 110. It is to be understood that the generatrix of the tapered guide slope 201 (which is rotated about the rotational axis of the diaphragm 200 to form the tapered guide slope 201) is not necessarily a straight line, but may be an arc line with a center recessed inward compared to the upper and lower ends as shown in fig. 10.

In addition, the casing 100 may be formed with an air inlet duct 140, and an inlet of the air inlet duct 140 forms the air inlet 110. The inner wall of the air inlet duct 140 is a tapered surface that gradually extends from bottom to top to the center in an inclined manner, so as to form a volute-like structure with the tapered guide inclined surface 201 of the deflector 200, thereby enhancing the air inlet guide function and improving the air suction efficiency of the fan.

As shown in fig. 8 and 9, the peripheral contour of the baffle 200 may be circular, and the intake vent 110 may also be circular. Both are circular structures for more smoothly entering air, and the bottom appearance of the indoor unit is more attractive. In addition, the peripheral contour diameter of the diversion disk 200 can be made larger than the diameter of the air inlet 110, so as to increase the diversion length of the diversion disk 200 and ensure the diversion effect. Meanwhile, the baffle 200 can completely shield the air inlet 110, so that the bottom of the indoor unit is more beautiful. As shown in fig. 8, the diaphragm 200 is connected to the housing 100 by a plurality of connecting arms 210. In addition, the diaphragm 200 may be movable up and down with respect to the housing 100.

Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.

Claims

1. A laminar flow fan, characterized by comprising:

the motor is used for driving the annular disks to rotate so as to suck outside air into the radial central areas of the annular disks from one axial side of the annular disks and blow the outside air out along the radial directions of the annular disks; and is

2. The laminar flow fan according to claim 1,

each annular disc is provided with the plurality of protruding parts.

3. The laminar flow fan according to claim 2,

the surface of each annular disc, which only faces the air inlet side of the laminar flow fan, is provided with the plurality of protrusions.

4. The laminar flow fan according to claim 2,

the plurality of convex parts are arranged in a plurality of layers along the radial direction of the annular disc;

each layer has the same number of the protrusions, and the protrusions of each layer are arranged on a circumference concentric with the annular disc.

5. The laminar flow fan according to claim 2,

each convex part is hemispherical;

the diameters of the convex parts of the different annular disks are different, and the diameters of the convex parts of the annular disks are gradually reduced from the direction close to the air inlet side of the laminar flow fan to the direction far away from the air inlet side.

6. The laminar flow fan according to claim 1,

the laminar flow fan also comprises a circular disk, the circular disk is arranged on the outer side of the annular disk on the outermost side and is fixedly connected with the annular disk, and a plurality of convex parts are formed on the inner surface of the circular disk;

and the rotating shaft of the motor is connected to the inner side of the circular disc so as to drive the circular disc to rotate.

7. The laminar flow fan according to claim 6,

the laminar flow fan further comprises a plurality of connecting rods, each connecting rod penetrates through the circular disk and the annular disks to fixedly connect the annular disks to the circular disk.

8. The laminar flow fan according to claim 1,

for the plurality of annular disks, the distance between two adjacent annular disks is gradually increased from the air inlet side to the other side.

9. A ceiling type air conditioner indoor unit, characterized by comprising:

the top of the shell is used for being fixed on a roof, the bottom of the shell is provided with an air inlet, and the side of the shell is provided with at least one air supply outlet;

a heat exchanger disposed within the housing; and

the laminar flow fan according to any one of claims 1 to 8, wherein an axis of the laminar flow fan is disposed in the housing in a manner of extending in a vertical direction, and an air inlet side of the laminar flow fan is disposed downward, so as to force indoor air to enter the housing from the air inlet, exchange heat with the heat exchanger, and then flow to the air supply outlet.

10. The indoor unit of a ceiling type air conditioner as set forth in claim 9,

the heat exchanger is in the shape of an arc plate with an axis extending in the vertical direction, and surrounds the laminar flow fan at the radial outer side of the laminar flow fan.