Laminar flow fan and ceiling mounted air conditioner indoor unit

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

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a laminar flow fan 300 and a ceiling-mounted air conditioner indoor unit. Background Art

[0002] With the development of society and the continuous improvement of people's living standards, various air conditioning devices have become one of the indispensable electrical equipment in people's daily lives. Various air conditioning devices can help people reach a temperature they can adapt to when the ambient temperature is too high or too low.

[0003] The current air conditioning devices mainly include various types of air conditioners and fans, but most users believe that the hot air or cold air generated by the current air conditioners is unevenly distributed in the room or enclosed space, and has certain distribution limitations. In addition, the fans used in the indoor unit of the air conditioner are mainly centrifugal fans and cross-flow fans. However, centrifugal fans and cross-flow fans have the following problems: Since the centrifugal fan needs dozens of large-volume blades to increase the wind pressure and air volume, the centrifugal fan is very noisy, and when the centrifugal fan is used in a vertical air conditioner, the air needs to make two 90° turns from entering the centrifugal fan to being sent out of the air conditioner, and each direction turn will cause air volume loss; although the cross-flow fan has lower noise, the wind pressure is too small and the air supply distance is short. In addition, the overall volume of the cross-flow fan is large, while the actual effective volume is small, resulting in space waste. Summary of the invention

[0004] An object of the present invention is to provide a laminar flow fan with high air volume so as to be better applied to air conditioners.

[0005] A further object of the present invention is to reduce the noise of the laminar flow fan and eliminate abnormal sounds.

[0006] Another object of the present invention is to provide a ceiling-mounted air-conditioning indoor unit using a laminar flow fan.

[0007] In one aspect, the present invention provides a laminar flow fan, comprising:

[0008] 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

[0009] A motor is used to drive the multiple annular discs to rotate so as to draw outside air from one axial side of the multiple annular discs into the radial central area of ​​the multiple annular discs and then blow it out radially outward along the multiple annular discs;

[0010] A plurality of protrusions are formed on the surface of at least a portion of the annular disk to enhance the turbulence of the airflow on the surface layer of the annular disk and reduce the overall noise of the laminar flow fan.

[0011] Optionally, each annular disc is provided with a plurality of protrusions.

[0012] Optionally, a plurality of protrusions are provided on the surface of each annular disk only facing the air inlet side of the laminar flow fan.

[0013] 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 protrusions, and the protrusions of each layer are arranged on a circumference concentric with the annular disk.

[0014] Optionally, each protrusion is hemispherical; the diameters of the protrusions of different annular disks are different, and the diameter of the protrusions of the annular disks gradually decreases from the air inlet side of the laminar fan to the direction away from the air inlet side.

[0015] Optionally, the laminar flow fan also includes 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.

[0016] Optionally, the laminar flow fan further includes a plurality of connecting rods, each connecting rod passing through the circular disk and the plurality of annular disks to fix the plurality of annular disks to the circular disk.

[0017] Optionally, for the plurality of annular disks, a distance between two adjacent annular disks gradually increases in a direction from the air inlet side to the other side.

[0018] On the other hand, the present invention also provides a ceiling-mounted air-conditioning indoor unit, comprising: a shell, a top of which is used to be fixed to the roof, a bottom having an air inlet, and a side having at least one air supply outlet; a heat exchanger, arranged in the shell; a laminar flow fan according to any of the above items, the axis of the laminar flow fan being arranged in the shell extending in a vertical direction, and the air inlet side thereof being arranged downward, for promoting indoor air to enter the shell from the air inlet, and then flow to the air supply outlet after heat exchange with the heat exchanger.

[0019] Optionally, 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 outside of the laminar flow fan.

[0020] The laminar flow fan of the present invention realizes laminar air supply through the viscosity effect between air and the surface of the annular disk, reduces the use of blades in traditional fans, and can even meet the air volume requirement without adding blades. The air supply process has low noise and high air volume, effectively improving the user experience.

[0021] Furthermore, for the laminar flow fan, its multiple annular discs are arranged in parallel and at intervals. During the rotating air supply process, the noise frequency generated between each annular disc and the airflow around it converges and has a strong consistency. The superposition of each other will make the noise larger. The present invention sets a protrusion on the annular disc, which can disturb the surface airflow to a certain extent, thereby disrupting the consistency of the airflow noise frequency around each annular disc, and superimposing and eliminating each other, so that the overall noise of the laminar flow fan is reduced, and no abnormal sound is generated. In addition, the present invention makes the diameters of the protrusions of different annular discs different, and the diameter of the protrusion of the annular disc gradually decreases from the air inlet side of the laminar flow fan to the direction away from the air inlet side, so that the difference in its turbulence effect is increased, ensuring that the airflow noise around different annular discs is different from each other.

[0022] Furthermore, the distance between each adjacent annular disk of the laminar fan of the present invention is set to be different, the distance close to the air inlet side is smaller, and the distance away from the air inlet side is larger, which can effectively increase the air volume of the laminar fan so that the air outlet of the laminar fan meets the user's usage requirements.

[0023] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0025] Figure 1 is a schematic diagram of the overall structure of a laminar flow fan according to an embodiment of the present invention;

[0026] Figure 2 yes Figure 1 A schematic bottom view of the laminar flow fan shown;

[0027] Figure 3 is a schematic diagram of the air supply principle of a laminar flow fan according to an embodiment of the present invention;

[0028] Figure 4 is a velocity distribution and force distribution diagram of a laminar flow fan according to an embodiment of the present invention;

[0029] Figure 5 is a schematic diagram of air circulation of a laminar flow fan according to an embodiment of the present invention;

[0030] Figure 6 is a schematic diagram showing the relationship between the gradual change in the spacing between multiple annular disks of a laminar flow fan and the air volume and air pressure according to an embodiment of the present invention;

[0031] Figure 7 is a schematic diagram of the relationship between the motor speed, air volume and air pressure of a laminar flow fan according to an embodiment of the present invention;

[0032] Figure 8 is a schematic side view of a ceiling-mounted air conditioner indoor unit according to an embodiment of the present invention;

[0033] Fig. 9 yes Figure 8 A schematic bottom view of the indoor unit of the ceiling-mounted air conditioner shown;

[0034] Fig.10 yes Figure 8 AA cross-sectional view of the indoor unit of the ceiling-mounted air conditioner is shown. DETAILED DESCRIPTION

[0035] Refer to the following Figures 1 to 10 The laminar flow fan and ceiling-mounted air conditioner indoor unit of the embodiments of the present invention are described in detail. The directions or positional relationships indicated by “front”, “rear”, “upper”, “lower”, “top”, “bottom”, “inner”, “outer”, “lateral”, etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention.

[0036] Figure 1 is a schematic diagram of the overall structure of a laminar flow fan according to an embodiment of the present invention; Figure 2 yes Figure 1 Schematic bottom view of the laminar flow fan shown. Figure 1 Arrows indicate wind direction.

[0037] like Figure 1 and Figure 2 As shown, the laminar flow fan 300 of the embodiment of the present invention may generally include a plurality of annular discs 10 and a motor 20. The plurality of annular discs 10 are arranged in parallel and spaced apart and fixedly connected to each other, and their axes are arranged in a colinear manner. The motor 20 is used to drive the plurality of annular discs 10 to rotate, so that the air boundary layer 13 (the air boundary layer 13 is a very thin air layer close to the surface of each annular disc) near the surface of the plurality of annular discs 10 is driven by the plurality of annular discs 10 to rotate from the inside to the outside due to the viscosity effect to form laminar wind. In this way, when the laminar flow fan 300 is running, the outside air is drawn in from one axial side (such as the axial side) of the plurality of annular discs 10. Figure 1 The embodiment shown is the lower side) sucks in the radial central area (i.e. Figure 5The laminar flow fan 300 has low noise and high air volume during air delivery, and can achieve 360° circumferential air discharge, which can match air conditioners or other devices with such air discharge requirements.

[0038] Because the multiple annular discs 10 are arranged in parallel and at intervals, during the rotation and air supply process, the noise frequency generated between each annular disc 10 and the surrounding airflow has a strong consistency, and the superposition of multiple noises will increase the overall noise of the fan.

[0039] To this end, the embodiment of the present invention particularly forms a plurality of protrusions 15 on the surface of at least part of the annular disk 10, in order to enhance the turbulence of the surface airflow of the annular disk 10. The turbulence disrupts the consistency of the frequency of the airflow noise around each annular disk 10. In this way, when the noises are superimposed on each other, a part of them can be eliminated, thereby reducing the overall noise of the laminar flow fan 300 and preventing abnormal noise.

[0040] Each annular disc 10 may be provided with a protrusion 15 to ensure a better turbulence noise reduction effect. In addition, because the wind pressure on the side of the annular disc 10 facing the air inlet side is greater than that on the other side, a better turbulence effect can be achieved by providing a protrusion 15 only on the surface of each annular disc 10 facing the air inlet side of the laminar flow fan 300. Figure 1 As shown, the annular disk 10 is axially arranged vertically, and wind enters the laminar flow fan 300 from bottom to top, so its air inlet side is its lower side, the protrusion 15 is arranged on the lower surface of the annular disk 10, and the upper surface of the annular disk 10 is still flat.

[0041] The plurality of protrusions 15 may be arranged in multiple layers along the radial direction of the annular disk 10, each layer having the same number of protrusions 15, and the protrusions 15 of each layer are arranged on a circumference concentric with the annular disk 10. Figure 2 As shown, three layers of protrusions 15 are arranged on the surface of an annular disk 10, each layer having 20 protrusions. Thus, when the annular disk 10 rotates, the airflow passes through the three layers of protrusions 15, which can ensure a sufficient turbulence effect.

[0042] Each protrusion 15 may be hemispherical. The surface of the hemispherical protrusion is more rounded, which not only has a spoiler effect, but also avoids additional new noise because the surface has no edges and corners. The diameters of the protrusions 15 of different annular disks 10 can be made different, so as to increase the difference in spoiler effect and ensure that the airflow noise around different annular disks 10 is different from each other. Specifically, the closer to the air inlet side of the laminar flow fan 300, the greater the air inlet pressure, and the farther away from the air inlet side, the smaller the air inlet pressure. In order to match the trend of wind pressure changes, the diameter of the protrusion 15 of the annular disk 10 can be gradually reduced in the direction from the air inlet side to the air inlet side. Figure 1 For example, the diameter of the raised portion 15 of the annular disk 10 at the bottom close to the air inlet side is the largest, and the diameter of the raised portion 15 of the annular disk 10 at the top is the smallest.

[0043] like Figure 1 As shown, the laminar flow fan 300 further includes a circular disc 30. The circular disc 30 is located outside the outermost annular disc 10 (i.e. Figure 1 The inner surface of the circular disk 30 (i.e. Figure 1 The lower surface of the circular disk 30 is also formed with a plurality of protrusions 15. The motor 20 extends into the air inlet passage 11 radially inside 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 the circular disk 30 can be the same as the outer diameter of the plurality of annular disks 10.

[0044] The laminar flow fan 300 may further include a plurality of connecting rods 40. Each connecting rod 40 may penetrate the circular disc 30 and the plurality of annular discs 10 to connect the plurality of annular discs 10 to the circular disc 30. The plurality of connecting rods 40 evenly penetrate the edges of the circular disc 30 and the plurality of annular discs 10 to ensure that the connection relationship between the circular disc 30 and the plurality of annular discs 10 is stable, thereby ensuring that when the motor 20 drives the circular disc 30 to rotate, the circular disc 30 can stably drive the plurality of annular discs 10 to rotate, thereby improving the working reliability of the laminar flow fan 300.

[0045] Figure 3 is a schematic diagram of the air supply principle of a laminar flow fan according to an embodiment of the present invention; Figure 4 1 is a diagram showing the velocity distribution and force distribution of a laminar flow fan according to an embodiment of the present invention.

[0046] like Figure 3 and Figure 4 As shown, the air supply principle of the laminar fan is mainly derived from the "Tesla turbine" discovered by Nikola Tesla. The Tesla turbine mainly uses the "laminar boundary layer effect" or "viscous effect" of the fluid to achieve the purpose of doing work on the "turbine disc". The laminar fan of this embodiment drives the circular disc 30 through the motor 20, and the circular disc 30 drives multiple annular discs 10 to rotate at high speed. The air in the intervals of each annular disc 10 contacts and moves with each other. Then, 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 the inside to the outside to form a laminar wind due to the viscous shear force τ.

[0047] Figure 4The diagram shows the viscous shear force distribution τ(y) and velocity distribution u(y) on the air boundary layer 13. The viscous shear force on the air boundary layer 13 is actually the resistance generated by each disk on the air boundary layer 13. Figure 4 The horizontal axis in refers to the distance in the moving direction of the air boundary layer 13, and the vertical axis refers to the height of the air boundary layer 13 in the direction perpendicular to the moving direction. e is the air velocity at each point in the air boundary layer 13, δ is the thickness of the air boundary layer 13, τ w is the viscous shear force at the surface of the annular disk 10. The variable y in τ(y) and u(y) refers to the height of the cross section of the air boundary layer 13 in the direction perpendicular to the moving direction, and L is the distance between a certain point on the inner circumference of the annular disk 10 and a certain point on the surface of the annular disk 10. Then τ(y) is the distribution of the viscous shear force when the height of the cross section of the air boundary layer 13 is y at the distance L; u(y) is the velocity distribution when the height of the cross section of the air boundary layer 13 is y at the distance L.

[0048] Figure 5 FIG. 1 is a schematic diagram of air circulation of a laminar flow fan according to an embodiment of the present invention. Figure 5 As shown, the radial centers of the plurality of annular discs 10 together form an air inlet channel 11 to allow air outside the laminar fan 300 to enter. The gaps between the plurality of annular discs 10 form a plurality of air outlets 12 for the laminar air to blow out. The process of the air boundary layer 13 rotating from the inside to the outside to form the laminar air is a centrifugal motion, so the speed when leaving the air outlet 12 is greater than the speed when entering the air inlet channel 11.

[0049] In some embodiments, for the 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). Figure 5 As shown, the spacing between two adjacent annular discs 10 gradually increases from bottom to top. After many experiments, the inventors found that such a setting will effectively increase the air volume of the laminar flow fan 300. The change in the spacing between two adjacent annular discs 10 can be made the same, that is, the value of the spacing between two adjacent annular discs 10 increasing from bottom to top is the same. For example, the spacing between two adjacent annular discs 10 among the 8 annular discs 10 can be 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 discs 10 increases by 1mm from bottom to top. It should be noted that the specific values ​​of the spacing change between the above two adjacent annular discs 10 are only examples, and are not limitations of the present invention.

[0050] The multiple air outlets 12 formed by the gaps between the multiple annular discs 10 can enable the laminar flow fan to achieve 360° uniform air supply, avoiding various discomfort symptoms caused by direct air supply from the air conditioner, and further improving the user experience.

[0051] Figure 6 The diagram is a schematic diagram of the relationship between the gradual change of the spacing between the multiple annular disks 10 of the annular disk 10 of the laminar flow fan according to an embodiment of the present invention and the air volume and the air pressure. The horizontal axis "shrinking uniform expanding Plate distance increase" refers to the change in the spacing between two adjacent annular disks 10 along the direction from bottom to top, the left vertical axis "Mass flow rate" refers to the air volume, and the right vertical axis "Pressure rise" refers to the wind pressure, which refers to the pressure difference between the air outlet 12 of the laminar flow fan and the inlet of the air inlet channel 11. In addition, the spacing change between two adjacent annular disks 10 is the same, that is, the value of the increase or decrease in the spacing between two adjacent annular disks 10 is the same.

[0052] Specifically, Figure 6 The figure shows the relationship between the gradual change of the spacing between the multiple annular disks 10 and the air volume and air pressure when the outer diameter, inner diameter, number, thickness and speed of the annular disk 10 of the laminar fan remain unchanged. Figure 6 As shown, when all the above-mentioned parameters remain unchanged, the distance between every two adjacent annular disks 10 in the multiple annular disks 10 gradually changes from bottom to top, which has a greater impact on the air volume, but has a small impact on the wind pressure. When the change in the distance between two adjacent annular disks 10 along the direction from bottom to top represented by the horizontal axis is a positive number, it means that the distance between every two adjacent annular disks 10 in the multiple annular disks 10 gradually increases from bottom to top; when the change in the distance between two adjacent annular disks 10 along the direction from bottom to top represented by the horizontal axis is a negative number, it means that the distance between every two adjacent annular disks 10 in the multiple annular disks 10 gradually decreases from bottom to top. Figure 6It can be seen that when the distance between each two adjacent annular discs 10 in the plurality of annular discs 10 varies by -1 mm, 1 mm and 2 mm, the air volume and air pressure of the laminar flow fan are greatly improved. Taking the air volume and air pressure of the laminar flow fan into consideration, the distance between each two adjacent annular discs 10 in the plurality of annular discs 10 is set to gradually increase from bottom to top. In one embodiment, the outer diameter of the annular disc 10 of the laminar flow fan is 175 mm, the inner diameter of the annular disc 10 is 115 mm, the number of the annular discs 10 is 8, the thickness of the annular disc 10 is 2 mm, and the speed of the motor 20 is 1000 rpm (revolutions per minute). At this time, considering the air volume and air pressure of the laminar flow fan, the spacing between two adjacent annular discs 10 in the 8 annular discs 10 can be set to 13.75 mm, 14.75 mm, 15.75 mm, 16.75 mm, 17.75 mm, 18.75 mm, 19.75 mm from bottom to top, that is, the spacing between two adjacent annular discs 10 increases by 1 mm from bottom to top. It should be noted that the spacing between two adjacent annular discs 10 in the plurality of annular discs 10 increases gradually from bottom to top, which actually means that the spacing between two adjacent annular discs 10 increases gradually along the direction of the airflow in the air inlet channel 11.

[0053] Figure 7 1 is a schematic diagram of the relationship between the speed of the motor 20 of the laminar flow fan according to an embodiment of the present invention, the air volume and the air pressure. The horizontal axis Speed ​​of revolution refers to the speed of the motor 20, the left vertical axis Mass flowrate refers to the air volume, and the right vertical axis Pressure rise refers to the air pressure. Specifically, Figure 7 The figure shows the relationship between the rotation speed of the motor 20 and the air volume and air pressure when the outer diameter, inner diameter, number of layers, spacing and thickness of the annular disk 10 of the laminar fan remain unchanged. Figure 7 As shown, when the above-mentioned parameters remain unchanged, the air volume increases approximately linearly with the increase in the speed of the motor 20, but the speed tends to slow down, and the wind pressure increment remains basically unchanged. That is, for the same laminar fan, the air volume increases approximately linearly when the speed of the motor 20 increases. In a preferred embodiment, the outer diameter of the annular disk 10 of the laminar fan is 175mm, the inner diameter of the annular disk 10 is 115mm, the number of layers of the annular disk 10 is 8, and the spacing between two adjacent annular disks 10 is set from bottom to top as: 13.75mm, 14.75mm, 15.75mm, 16.75mm, 17.75mm, 18.75mm, 19.75mm, and when the thickness of the annular disk 10 is 2mm, the linear relationship between the speed of the motor 20 and the air volume of the laminar fan is more obvious.

[0054] Since the rotation speed of the motor 20 is roughly linearly related to the air volume of the laminar flow fan, in a preferred embodiment, the motor 20 can also be configured such that the rotation speed of the motor 20 is determined according to the acquired target air volume of the laminar flow fan. In other words, the target air volume of the laminar flow fan can be first acquired, and then the rotation speed of the motor 20 can be determined according to the linear relationship between the target air volume and the rotation speed of the motor 20. It should be noted that the target air volume can be acquired through the user's input operation.

[0055] The present invention also provides a ceiling-mounted air-conditioning indoor unit, which together with an air-conditioning outdoor unit (not shown) forms a vapor compression refrigeration cycle system to achieve cooling / heating of the indoor environment.

[0056] Figure 8 is a schematic side view of a ceiling-mounted air conditioner indoor unit according to an embodiment of the present invention; Fig. 9 yes Figure 8 A schematic bottom view of the indoor unit of the ceiling-mounted air conditioner shown; Fig.10 yes Figure 8 AA cross-sectional view of the indoor unit of the ceiling-mounted air conditioner is shown.

[0057] like Figures 8 to 10 As shown, the ceiling-mounted 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 .

[0058] The indoor unit of the ceiling air conditioner is installed on the indoor roof as a whole. Figure 8 The roof is indicated by a dotted line, and the top of the housing 100 is used to be fixed to the roof, and the rest of the air conditioner indoor unit is exposed under the roof.

[0059] The housing 100 has an air inlet 110 at the bottom and at least one air outlet 120 at the side. The number of the air outlet 120 can be one or more. Fig. 9 As shown, the shell 100 is a square structure, and four air outlets 120 are arranged along the circumference of the shell 100 to achieve air supply in four directions. Of course, more air outlets 120 can be arranged along the circumference of the shell 100 to achieve air supply in more directions. Even, the shell 100 can be made circular, and air outlets 120 are opened at all angles of its circumference for air outlet to achieve 360° all-round air supply. In addition, because the indoor unit of the ceiling-mounted air conditioner is installed at a higher position, its air outlet coverage range is also very large, which is conducive to improving the cooling / heating speed and making the user more comfortable. An air guide plate 121 can be set at each air outlet 120 to open and close the air outlet 120. The air guide plate 121 can be controlled to guide the air outlet angle by rotating around a horizontal axis.

[0060] The heat exchanger 400 may be an evaporator of a vapor compression refrigeration cycle, which is disposed in the housing 100 (eg, Fig.10After the indoor air enters the housing 100 from the air inlet 110, it exchanges heat with the heat exchanger 400 and becomes heat exchange air (in cooling, the heat exchange air is cold air, and in heating, the heat exchange air is hot air). The heat exchange air flows to the air supply port 120 to achieve indoor cooling / heating.

[0061] The laminar flow fan 300 is disposed in the housing 100 , with its axis extending in the vertical direction and the air inlet side disposed downward, for promoting the indoor air to flow upward from the air inlet 110 into the housing 100 , and then flow to the air outlet 120 after heat exchange with the heat exchanger 400 .

[0062] like Fig.10 The heat exchanger 400 can be an arc-shaped plate with its axis extending in the vertical direction (considering the manufacturing process, it is not a complete arc, but an arc shape), and is arranged close to the radial inner side of multiple annular disks 10, so that it is closer to the annular disks 10, which is more conducive to absorbing airflow from the heat exchanger 400.

[0063] In some embodiments, Figures 8 to 10 As shown, the ceiling-mounted air conditioner indoor unit also includes a guide plate 200. The guide plate 200 is arranged below the housing 100, and a gap is formed between the top surface and the bottom surface of the housing 100. One function of the guide plate 200 is to guide the indoor air from the periphery of the guide plate 200 to flow to the air inlet 110 through the gap between the guide plate 200 and the housing 100. Compared with the solution of allowing the wind to enter the housing 100 directly vertically upward from the bottom of the housing 100, the guide plate 200 is arranged in the embodiment of the present invention, so that the bottom appearance of the ceiling-mounted indoor unit (the bottom of which is mainly facing the user) is more beautiful, and the complex air inlet grille arranged at the bottom of the housing 100 is avoided to affect the appearance. Moreover, this also makes the air inlet direction close to the horizontal direction, and the air outlet direction is also close to the horizontal direction, and the angle between the two is smaller, so that the fan energy consumption and noise are reduced.

[0064] like Figure 8 and Fig.10 As shown, the guide plate 200 may have a tapered guide slope 201 that gradually slopes downward from its center to its periphery, so as to guide the indoor air. After the indoor air enters the gap between the guide plate 200 and the housing 100 from the periphery of the guide plate 200, it gradually deflects upward under the guidance of the tapered guide slope 201, so as to facilitate its entry into the air inlet 110. It is understandable that the generatrix of the tapered guide slope 201 (the generatrix rotates around the rotation axis of the guide plate 200 to form the tapered guide slope 201) does not have to be a straight line, but may also be as follows: Fig.10 The figure shows an arc that is concave in the center compared to the upper and lower ends.

[0065] In addition, the housing 100 may be provided with an air inlet duct 140, the entrance of which constitutes the aforementioned air inlet 110. The inner wall of the air inlet duct 140 may be a tapered surface that gradually extends from bottom to top toward the center, so as to form a volute-like structure with the tapered guiding inclined surface 201 of the guide plate 200, thereby enhancing its air inlet guiding function and improving the air suction efficiency of the fan.

[0066] like Figure 8 and Fig. 9 As shown, the peripheral contour of the guide plate 200 can be circular, and the air inlet 110 can also be circular. Both are circular structures in order to allow smoother air intake and a more beautiful appearance at the bottom of the indoor unit. In addition, the peripheral contour diameter of the guide plate 200 can be made larger than the diameter of the air inlet 110 to increase the guide length of the guide plate 200 and ensure the guide effect. At the same time, the guide plate 200 is sufficient to completely cover the air inlet 110, making the bottom of the indoor unit more beautiful. Figure 8 As shown, the guide plate 200 is connected to the housing 100 via a plurality of connecting arms 210. In addition, the guide plate 200 can be moved up and down relative to the housing 100.

[0067] At this point, those skilled in the art should recognize that, although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived based on the content disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all these other variations or modifications.

Claims

1. A laminar flow fan, characterized in that include: A plurality of annular discs are arranged parallel to each other at intervals 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 faces only 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, characterized in that include: 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 is disposed in the shell; 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.

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