CN111442379B

CN111442379B - Laminar flow fan and ceiling mounted air conditioner indoor unit

Info

Publication number: CN111442379B
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; Haier Smart Home Co Ltd
Priority date: 2019-01-17
Filing date: 2019-01-17
Publication date: 2025-02-21
Anticipated expiration: 2039-01-17
Also published as: CN111442379A

Abstract

The present invention provides a laminar flow fan and a ceiling-mounted air conditioner indoor unit. The laminar flow fan comprises: a plurality of annular discs, which are arranged parallel to each other and fixedly connected, and the axes are arranged in a colinear manner; and a motor, which is used to drive the plurality of annular discs to rotate, so as to inhale the outside air from one axial side of the plurality of annular discs into the radial central area of the plurality of annular discs, and then blow it out radially along the plurality of annular discs; at least a plurality of protrusions are formed on the surface of some of the annular discs, so as to enhance the turbulence of the airflow on the surface layer of the annular discs and reduce the overall noise of the laminar flow fan.

Description

Laminar flow fan and ceiling type air conditioner indoor unit

Technical Field

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

Background

With the development of society and the continuous improvement of living standard of people, various air conditioning apparatuses have become one of the indispensable electrical devices in people's daily life. Various air conditioning devices can help people reach an adaptable temperature when the ambient temperature is too high or too low.

The current air conditioner adjusting device mainly comprises 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 the current air conditioner has certain distribution limitation. 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 problems in that the centrifugal fan has a large noise due to the fact that the centrifugal fan needs to have several tens of large-volume blades to increase the wind pressure and the wind quantity, and when the centrifugal fan is used for a vertical air conditioner, the air needs to be turned by two 90 degrees from entering the centrifugal fan to being sent out of the air conditioner, and the wind quantity is lost every time the direction is turned, and the cross flow fan has a small wind pressure and a short wind supply distance although the noise is low. And the whole volume of the cross-flow fan is large, and the actual effective volume is small, so that space waste is caused.

Disclosure of Invention

It is an object of the present invention to provide a laminar flow fan with high air volume for better application to air conditioners.

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

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

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

a plurality of annular disks arranged in parallel and spaced apart and fixedly connected and having co-linear axes, and

A motor for driving the plurality of annular disks to rotate so as to suck external air from one axial side of the plurality of annular disks into a radial central region of the plurality of annular disks and blow the external air radially outward along the plurality of annular disks;

At least part of the surface of the annular disc is provided with a plurality of protruding parts so as to strengthen the turbulent flow of the air flow on the surface layer of the annular disc and reduce the integral noise of the laminar flow fan.

Optionally, a plurality of protrusions are provided on each annular disc.

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.

Alternatively, the plurality of projections are arranged in a plurality of layers in the radial direction of the annular disk, each layer having the same number of projections, and the projections of each layer being arranged on a circumference concentric with the annular disk.

Alternatively, each protruding part is hemispherical, the diameters of the protruding parts of different annular discs are different, and the diameters of the protruding parts of the annular discs gradually decrease from the air inlet side of the laminar flow fan to the direction away from the air inlet side.

Optionally, the laminar flow fan further comprises a circular disc which is arranged outside and fixedly connected with the outermost annular disc, a plurality of protruding parts are formed on the inner surface of the circular disc, and a rotating shaft of the motor is connected with 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 the circular disk and the plurality of annular disks to fixedly connect the plurality of annular disks to the circular disk.

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

On the other hand, the invention also provides a ceiling-mounted air conditioner indoor unit, which comprises a shell, a heat exchanger and a laminar flow fan, wherein the top of the shell is used for being fixed on a roof, the bottom of the shell is provided with an air inlet, the side of the shell is provided with at least one air supply outlet, the heat exchanger is arranged in the shell, the axis of the laminar flow fan is arranged in the shell in a vertical direction in an extending manner, the air inlet side of the laminar flow fan is downwards arranged, and the shell 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 in the shape of an arc plate whose axis extends in the vertical direction, which surrounds the laminar flow fan radially outside the laminar flow fan.

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

Further, for a laminar flow fan, a plurality of annular disks are arranged in parallel at intervals. In the process of rotating air supply, the noise frequency generated between each annular disc and the surrounding air flow is converged, so that the annular discs have strong consistency, and the noise can be increased by mutual superposition. The invention arranges the bulge on the annular disc, which can disturb the airflow on the surface layer, thereby disturbing the consistency of the noise frequency of the airflow around each annular disc, and eliminating the mutual superposition, thereby reducing the overall noise of the laminar fan and avoiding abnormal noise. In addition, the diameters of the protruding parts of the different annular discs are different, and the diameters of the protruding parts of the annular discs gradually decrease from the air inlet side close to the laminar flow fan to the air inlet side far away from the laminar flow fan, so that the difference of turbulence effects of the annular discs is increased, and the air flow noise around the different annular discs is ensured to be different from each other.

Further, the intervals between every two adjacent annular discs of the laminar flow fan are different, the interval close to the air inlet side is smaller, the interval far away from the air inlet side is larger, the air quantity 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, as well as additional objectives, advantages, and features of the present invention will become apparent to those skilled in the art from the following detailed description of a specific embodiment of the present invention when read in conjunction with the accompanying drawings.

Drawings

Some specific embodiments of the invention will be described in detail hereinafter by way of example and not by way of limitation with reference to the accompanying drawings. The same reference numbers will be used throughout the drawings to refer to the same or like parts or portions. It will be appreciated by those skilled in the art that the drawings are not necessarily drawn to scale. In the accompanying drawings:

FIG. 1 is a schematic diagram of the overall structure of a laminar flow fan according to one 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 one 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 air circulation diagram of a laminar flow fan according to one embodiment of the present invention;

FIG. 6 is a graphical illustration of a plurality of annular disk pitch gradients versus air volume and air pressure for a laminar flow fan according to one embodiment of the present invention;

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

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

FIG. 9 is a schematic bottom view of the ceiling-mounted air conditioner indoor unit of FIG. 8;

Fig. 10 is a cross-sectional view A-A of the ceiling type air conditioner indoor unit shown in fig. 8.

Detailed Description

A laminar flow fan and a ceiling type air conditioner indoor unit according to an embodiment of the present invention will be described with reference to fig. 1 to 10. Where the terms "front", "rear", "upper", "lower", "top", "bottom", "inner", "outer", "transverse", etc., refer to an orientation or positional relationship based on that shown in the drawings, this is merely for convenience in describing the invention and to simplify the description, and does not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.

Fig. 1 is a schematic view showing the overall structure of a laminar flow fan according to an embodiment of the present invention, and fig. 2 is a schematic bottom view of the laminar flow fan shown in fig. 1. The wind direction is illustrated by arrows in fig. 1.

As shown in fig. 1 and 2, a laminar flow fan 300 of 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 and are fixedly connected with each other with axes arranged in a collinear manner. The motor 20 is used to drive the plurality of annular disks 10 to rotate, so that the air boundary layer 13 (the air boundary layer 13 is a very thin air layer near the surface of each annular disk) near the surface of the plurality of annular disks 10 is driven by the plurality of annular disks 10 to rotate from inside to outside due to the viscosity effect to form laminar wind. In this way, when the laminar flow fan 300 is operated, the external air is sucked from one side (lower side in the embodiment shown in fig. 1) in the axial direction of the plurality of annular disks 10 into the radially central region (i.e., the air inlet passage 11 shown in fig. 5) of the plurality of annular disks 10, and is blown out radially outward along the plurality of annular disks 10. The laminar flow fan 300 has small noise and high air quantity in the air supply process, can realize 360-degree air outlet in the circumferential direction, and can be matched with an air conditioner or other devices with the air outlet requirement.

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 of the plurality of annular disks 10 is overlapped with each other, so that the overall noise of the fan is increased.

To this end, the embodiment of the present invention particularly forms a plurality of protrusions 15 on at least a part of the surface of the annular disk 10 in order to enhance turbulence of the air flow on the surface of the annular disk 10. By the turbulence, uniformity of the noise frequency of the air flow around each annular disk 10 is disturbed. In this way, when the noises are superimposed on each other, a part of the noises can be eliminated, so that the entire noise of the laminar flow fan 300 is reduced, and no abnormal sound is generated.

A protrusion 15 may be provided on each annular disc 10 to ensure a better turbulence reduction effect. Further, since the wind pressure received by one surface of the annular disk 10 facing the air intake side is greater than the other surface, the surface of each annular disk 10 facing only the air intake side of the laminar flow fan 300 is provided with the convex portion 15, and a better turbulence effect can be obtained. As shown in fig. 1, the annular disk 10 is vertically disposed in the axial direction, and wind enters the laminar flow fan 300 from the bottom up, so that the air inlet side thereof is the lower side thereof, the boss 15 is disposed on the lower surface of the annular disk 10, and the upper surface of the annular disk 10 is still planar.

The plurality of bosses 15 may be arranged in a plurality of 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 projections 15, 20 each. So that after the annular disk 10 is rotated, the air flow passes through the 3-layer bosses 15 to disturb the layer by layer. This ensures that a sufficient turbulence effect is achieved.

Each boss 15 may be hemispherical. The hemispherical bulge has more round surface, thus not only having turbulence effect, but also avoiding additional new noise because the surface has no edges and corners. The diameters of the convex parts 15 of different annular discs 10 can be different, so that the difference of the turbulence effect is increased, and the different air flow noises around the different annular discs 10 are ensured. Specifically, the closer to the air intake side of the laminar flow fan 300, the greater the air intake pressure, and the further from the air intake side, the lower the air intake pressure. In order to match the wind pressure variation trend, the diameter of the boss 15 of the annular disk 10 may be gradually reduced from the intake side to the distant intake side. Taking fig. 1 as an example, the diameter of the boss 15 of the annular disk 10 located at the lowest side near the air intake side is the largest, and the diameter of the boss 15 of the annular disk 10 located at the uppermost side is the smallest.

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

Laminar flow fan 300 may also include a plurality of connecting rods 40. Each connecting rod 40 may extend through the platter 30 and the plurality of annular disks 10 to connect the plurality of annular disks 10 to the platter 30. The plurality of connecting rods 40 penetrate through the edges of the circular disc 30 and the plurality of annular discs 10 at uniform intervals to ensure that the connection relationship between the circular disc 30 and the plurality of annular discs 10 is stable, thereby ensuring that the circular disc 30 can stably drive the plurality of annular discs 10 to rotate when the motor 20 drives the circular disc 30 to rotate, and improving the working reliability of the laminar flow fan 300.

Fig. 3 is a schematic diagram of the air supply principle of a laminar flow fan according to one embodiment of the present invention, and fig. 4 is a velocity distribution and stress distribution diagram of the laminar flow fan according to one embodiment of the present invention.

As shown in fig. 3 and 4, the air supply principle of the laminar flow fan mainly originates from a "tesla turbine" found in nikola tesla. Tesla turbines mainly utilize the "laminar boundary layer effect" or "viscous effect" of a fluid to achieve the objective of doing work on "turbine disks". In the laminar flow fan of this embodiment, the circular disc 30 is driven by the motor 20, the circular disc 30 drives the plurality of annular discs 10 to rotate at a high speed, and the air in the spaces between the annular discs 10 contacts and moves mutually, so that the air boundary layer 13 close to the surface of each annular disc 10 is driven by the rotating annular disc 10 to rotate from inside to outside to form laminar flow wind due to the action of the viscous shearing force τ.

Fig. 4 shows a schematic diagram of the viscous shear force distribution τ (y) and the velocity distribution u (y) to which the air boundary layer 13 is subjected. The viscous shear force experienced by the air boundary layer 13 is actually the drag that each disc generates on 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 height of the air boundary layer 13 in the direction perpendicular to the moving direction. v _e is the air flow velocity at each point within the air boundary layer 13, δ is the thickness of the air boundary layer 13, τ _w is the viscous shear at the surface of the annular disk 10. The variable y in τ (y) and u (y) refers to the height of the air boundary layer 13 in cross section in the direction perpendicular to the moving direction, and L is the distance between a certain point of the inner circumference of the annular disk 10 and a certain point of the surface of the annular disk 10.τ (y) is the viscous shear force distribution experienced when the height of the air boundary layer 13 cross section is y at this distance L, and u (y) is the velocity distribution when the height of the air boundary layer 13 cross section is y at this distance L.

Fig. 5 is a schematic air circulation diagram 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 to allow air outside the laminar flow fan 300 to enter. A plurality of air outlets 12 are formed in the gaps between the annular disks 10 for laminar air to flow out. The air boundary layer 13 is rotated from inside to outside to form laminar air flow, and thus the velocity of the laminar air flow leaving the air outlet 12 is greater than the velocity of the laminar air flow entering the air inlet channel 11.

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

The plurality of air outlets 12 formed by the gaps between the plurality of annular discs 10 can enable the laminar flow fan to realize 360-degree uniform air supply, avoid various uncomfortable symptoms caused by direct air supply of the air conditioner, and further improve the use experience of the user.

Fig. 6 is a schematic diagram showing a relationship between a pitch gradient of a plurality of annular disks 10 of the annular disk 10 of the laminar flow fan and an air volume and an air pressure according to an embodiment of the present invention. Wherein the abscissa axis SHRINKING UNIFORM EXPANDING PLATE DISTANCE INCREASE refers to the amount of change in the interval between two adjacent annular disks 10 in the bottom-to-top direction, the left ordinate axis Mass flow rate refers to the air volume, the right ordinate axis Pressure rise 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 duct 11. Also, the amount of change in the spacing between adjacent two annular disks 10 is the same, that is, the amount by which the spacing between adjacent two annular disks 10 increases or decreases is the same.

Specifically, fig. 6 shows a schematic diagram of the relationship between the gradual change of the pitch of the plurality of annular disks 10 and the air volume and the air pressure when the outer diameter, the inner diameter, the number, the thickness and the rotation speed of the motor 20 of the annular disks 10 of the laminar fan are all kept unchanged. As shown in fig. 6, when the above-mentioned parameters are kept unchanged, the air volume is greatly affected and the air pressure is little affected by the gradual change of the interval between every two adjacent annular disks 10 among the plurality of annular disks 10 from bottom to top. When the amount of change in the interval between two adjacent annular disks 10 in the bottom-to-top direction, indicated by the axis of abscissa, is positive, it is explained that the interval between each two adjacent annular disks 10 in the plurality of annular disks 10 is gradually increased from bottom to top, and when the amount of change in the interval between two adjacent annular disks 10 in the bottom-to-top direction, indicated by the axis of abscissa, is negative, it is explained that the interval between each two adjacent annular disks 10 in the plurality of annular disks 10 is gradually decreased from bottom to top. As can be seen from fig. 6, when the interval between each two adjacent annular disks 10 of the plurality of annular disks 10 varies by-1 mm, 1mm and 2mm, the air volume and air pressure of the laminar flow fan are greatly improved. Considering the air volume and the air pressure of the laminar flow fan in combination, the interval between every two adjacent annular disks 10 in the plurality of annular disks 10 is set to be gradually increased from bottom to top. In one embodiment, the outer diameter of the annular disc 10 of the laminar flow fan is 175mm, the inner diameter of the annular disc 10 is 115mm, the number of the annular discs 10 is 8, the thickness of the annular disc 10 is 2mm, the rotating speed of the motor 20 is 1000rpm (revolutions per minute ), the air quantity and the air pressure of the laminar flow fan are considered comprehensively, and the interval between two adjacent annular discs 10 in the 8 annular discs 10 can be sequentially 13.75mm, 14.75mm, 15.75mm, 16.75mm, 17.75mm, 18.75mm and 19.75mm from bottom to top, namely, the interval between two adjacent annular discs 10 is sequentially increased by 1mm from bottom to top. Note 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 in which the air flow flows in the air intake passage 11.

Fig. 7 is a schematic diagram showing the relationship between the rotational 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. Where the abscissa axis Speed of revolution refers to the rotation speed of the motor 20, the left ordinate axis Mass flow rate refers to the air volume, and the right ordinate axis Pressure is referred to as the air Pressure. Specifically, fig. 7 shows a schematic diagram of the relationship between the rotational 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 annular disk 10 of the laminar flow fan are all kept unchanged. As shown in fig. 7, when the above-mentioned parameters are kept unchanged, the air volume increases substantially linearly with the increase in the rotation speed of the motor 20, but the increase in the speed tends to be retarded, and the increase in the air pressure does not substantially change. That is, the air volume increases substantially linearly when the rotational speed of the motor 20 increases for the same laminar flow fan. In a preferred embodiment, the outer diameter of the annular disc 10 of the laminar flow fan is 175mm, the inner diameter of the annular disc 10 is 115mm, the number of layers of the annular disc 10 is 8, the spacing between two adjacent annular discs 10 is sequentially 13.75mm, 14.75mm, 15.75mm, 16.75mm, 17.75mm, 18.75mm and 19.75mm from bottom to top, and 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 rotational speed of the motor 20 is substantially linear with the air volume of the laminar flow fan, in a preferred embodiment, the motor 20 may be further configured such that the rotational speed of the motor 20 is determined based on the obtained 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 rotational speed of the motor 20 may be determined based on a linear relationship between the target air volume and the rotational speed of the motor 20. The target air volume may be obtained by an input operation of a user.

The invention also provides a ceiling-mounted air conditioner indoor unit, which forms a vapor compression refrigeration cycle system together with an air conditioner outdoor unit (not shown), and realizes refrigeration/heating of an 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 shown in fig. 8, and fig. 10 is A-A cross-sectional view of the ceiling-type air-conditioning indoor unit shown in fig. 8.

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

The ceiling type air conditioner indoor unit is integrally installed under an indoor roof (the roof is shown by a dotted line in fig. 8), the top of the casing 100 is used for being fixed on the roof, and the rest of the air conditioner indoor unit is exposed under the roof.

The bottom of the housing 100 has an air inlet 110 and the side has at least one air outlet 120. The number of the air outlets 120 may be one or more. As shown in fig. 9, the casing 100 has a square structure, and four air supply ports 120 are arranged along the circumferential direction of the casing 100 to supply air in four directions. Of course, more air outlets 120 may be arranged along the circumference of the housing 100 to achieve more directional air supply. Even, the casing 100 may be circular, and the air supply opening 120 is formed at all angles in the circumferential direction for air outlet, so as to realize 360-degree omnibearing air supply. In addition, because the installation position of the indoor unit of the suspended air conditioner is higher, the air outlet coverage range is also extremely large, the refrigerating/heating speed is improved, and the user is more comfortable. One air deflector 121 may be provided at each air supply opening 120 to open and close the air supply opening 120. The air deflector 121 is controlled to rotatably guide the air outlet angle around a horizontal axis.

The heat exchanger 400 may be an evaporator of a vapor compression refrigeration cycle, which is disposed within the housing 100 (as in fig. 10). After entering the housing 100 from the air inlet 110, the indoor air is subjected to heat exchange with the heat exchanger 400 to be changed into heat exchange air (the heat exchange air is cold air during refrigeration and hot air during heating), and the heat exchange air flows to the air supply outlet 120, so that indoor refrigeration/heating is realized.

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

As shown in fig. 10, the heat exchanger 400 may be formed in an arc-shaped plate shape (considering the manufacturing process, it is not an entire arc but a major arc shape) with its axis extending in the vertical direction, and disposed near the radially inner sides of the plurality of annular disks 10 so as to be closer to the annular disks 10, thereby facilitating the absorption of the air flow from the heat exchanger 400.

In some embodiments, as shown in fig. 8 to 10, the ceiling-type air conditioner indoor unit further includes a baffle 200. The diaphragm 200 is disposed under the housing 100, and a top surface thereof forms a gap with a bottom surface of the housing 100. One function of the baffle 200 is to direct indoor air from around the periphery of the baffle 200 to the air intake 110 through the gap between the baffle 200 and the housing 100. Compared with the scheme that wind directly vertically upwards enters the shell 100 from the bottom of the shell 100, the air guide plate 200 is arranged in the embodiment of the invention, so that the appearance of the bottom of the suspended indoor unit (the bottom of the suspended indoor unit mainly faces a user) is more attractive, and the influence of complex air inlet grids arranged at the bottom of the shell 100 on the appearance is avoided. In addition, 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 deflector 200 may be provided with a tapered guide slope 201 gradually inclined downward from the center to the periphery thereof so as to deflect indoor air. After the indoor air enters the gap between the deflector 200 and the shell 100 from the periphery of the deflector 200, the indoor air gradually and obliquely flows upwards under the guidance of the conical guide inclined plane 201, so that the indoor air is beneficial to entering the air inlet 110. It will be appreciated that the generatrix of the tapered lead-in ramp 201 (which may rotate about the axis of rotation of the diaphragm 200 to form the tapered lead-in ramp 201) need not be a straight line, but may be an arc with a central recess inwardly at the upper and lower ends as shown in figure 10.

In addition, the housing 100 may be formed with an air inlet duct 140, and the inlet of the air inlet duct 140 may form the air inlet 110. The inner wall of the air inlet duct 140 can be a conical surface extending gradually from bottom to top to the center, so as to form a similar volute-shaped structure with the conical guiding inclined surface 201 of the flow guiding disc 200, thereby enhancing the air inlet guiding function and improving the air suction efficiency of the fan.

As shown in fig. 8 and 9, the peripheral outline of the baffle 200 may be circular, and the air inlet 110 may be circular. Both are circular structures in order to smoothly enter air, and the appearance of the bottom of the indoor unit is more attractive. In addition, the diameter of the peripheral outline of the flow guiding disc 200 can be larger than that of the air inlet 110, so that the flow guiding length of the flow guiding disc 200 is increased, and the flow guiding effect is ensured. And simultaneously, the flow guide plate 200 is enough to completely shield the air inlet 110, so that the bottom of the indoor unit is more attractive. As shown in fig. 8, the diaphragm 200 is connected to the housing 100 by a plurality of connection arms 210. In addition, the diaphragm 200 may be movable up and down with respect to the housing 100.

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

Claims

1. A laminar flow fan, comprising:

A plurality of annular discs are arranged parallel to each other, spaced apart and fixedly connected, and their axes are arranged in a colinear manner; and

a motor, configured to drive the plurality of annular discs to rotate, so as to draw outside air from one axial side of the plurality of annular discs into the radial central region of the plurality of annular discs, and then blow the outside air outward radially along the plurality of annular discs; and

A plurality of protrusions are formed on at least part of the surface of the annular disk to enhance the turbulence of the airflow on the surface of the annular disk and reduce the overall noise of the laminar flow fan;

Each of the annular discs is provided with the plurality of protrusions;

Each of the protrusions is hemispherical;

The diameters of the protrusions of different annular discs are different, and the diameters of the protrusions of the annular discs gradually decrease from the air inlet side of the laminar flow fan to the direction away from the air inlet side;

The plurality of protrusions are provided on a surface of each annular disk that is only facing the air inlet side of the laminar flow fan.

2. The laminar flow fan according to claim 1, characterized in that:

The plurality of protrusions are arranged in multiple layers along the radial direction of the annular disk;

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

3. The laminar flow fan according to claim 1, characterized in that:

The laminar flow fan further comprises a circular disc, which is outside the outermost annular disc and fixedly connected thereto, and a plurality of protrusions are also formed on the inner surface of the circular disc;

The rotating shaft of the motor is connected to the inner side of the circular disc to drive it to rotate.

4. The laminar flow fan according to claim 3, characterized in that:

The laminar flow fan further includes a plurality of connecting rods, each of which passes through the circular disk and the plurality of annular disks to fix the plurality of annular disks to the circular disk.

5. The laminar flow fan according to claim 1, characterized in that:

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

6. A ceiling-mounted air conditioner indoor unit, comprising:

A shell, the top of which is used to be fixed to the roof, the bottom of which has an air inlet, and the side of which has at least one air outlet;

a heat exchanger disposed in the housing; and

A laminar flow fan, wherein the laminar flow fan is a laminar flow fan according to any one of claims 1 to 5, wherein the axis of the laminar flow fan is vertically extended in the shell, and the air inlet side is downwardly arranged, so as to promote indoor air to enter the shell from the air inlet, and then flow to the air supply port after heat exchange with the heat exchanger.

7. The ceiling-mounted air conditioner indoor unit according to claim 6, characterized in that:

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