CN210014448U - Ceiling type air conditioner indoor unit - Google Patents

Abstract

The utility model provides a ceiling type air conditioner indoor unit, which comprises a shell, a plurality of air outlets and a plurality of air inlets, wherein the shell is provided with at least one air inlet and at least one air outlet; the heat exchanger is arranged in the shell; the fan is arranged in the shell and used for sucking indoor air through the air inlet to form heat exchange air after the indoor air exchanges heat with the heat exchanger and blowing the heat exchange air back to the indoor through the air outlet; the air duct component is arranged in the shell, is provided with at least one air duct which is in one-to-one correspondence with the at least one air outlet and is used for guiding heat exchange air to each air outlet; and the flow cross section of the air duct at the inlet section of the air duct is gradually reduced along the flow direction of the heat exchange air.

Description

Ceiling type air conditioner indoor unit

technical field

The utility model relates to the technical field of air conditioning, in particular to a ceiling type air conditioner indoor unit.

Background technique

Most of the existing household air conditioner indoor units are wall-mounted and floor-standing. Although merchants have made many improvements to the structure of the air conditioner indoor unit, it is difficult for the products to undergo essential changes and cannot meet the diverse needs of users.

In addition, the existing air conditioner indoor unit basically adopts a cross-flow fan, and the air outlet direction is straight ahead. Although there are wind deflectors to guide the flow left and right, and the swing blades to guide the flow up and down, it is limited by the volute structure, and the left and right air supply angles are usually Less than 80°, the upper and lower air supply angles are usually less than 100°. It can be seen that the existing indoor unit has few air supply directions, and the air supply range is very limited.

In addition, the current cross-flow fans are mainly forward blades, and the blades periodically impact the passing airflow, producing obvious rotational noise. The volute cooperates with the fan to achieve the air supply effect, and the front and rear volute tongues will also impact the airflow, resulting in strong turbulent noise. Under the existing technology, it is difficult to significantly improve the noise quality.

Utility model content

The purpose of the present invention is to solve at least one of the above-mentioned defects existing in the prior art, and to provide a ceiling-mounted air conditioner indoor unit to meet the diverse needs of users for the air conditioner indoor unit.

Another purpose of the utility model is to stabilize and pressurize the outlet air flow of the ceiling-mounted air conditioner indoor unit to reduce the eddy current loss, so as to make the air outlet smoother, reduce the wind resistance and increase the air supply distance.

A further purpose of the present invention is to reduce the air supply noise and improve the noise quality.

In particular, the utility model provides a ceiling-mounted air conditioner indoor unit, which includes:

a casing, having at least one air inlet and at least one air outlet, and the air outlet is located on the side of the casing;

a heat exchanger, arranged in the shell;

a fan, arranged in the casing, for inhaling indoor air through the air inlet, making it heat exchange with the heat exchanger to form heat exchange air, and blowing the heat exchange air back into the room through the air outlet; and

an air duct component, which is arranged in the casing, and is provided with at least one air duct corresponding to the at least one air outlet one-to-one, for guiding the heat exchange air to each air outlet; and

The flow cross section of the air duct at its inlet section tapers in the flow direction of the heat exchange air.

Optionally, the flow cross section of the air duct at its outlet section remains unchanged in the flow direction of the heat exchange air.

Optionally, from the inlet to the outlet of the air duct, the top wall of the air duct is sequentially connected with a plurality of sections that are tangentially connected, and each section extends toward the outlet of the air duct while gradually inclining downward, and the plurality of sections includes: an arc-shaped segment, the center of which is located inside the air duct; a second arc-shaped segment, the center of which is located inside the air duct and has a diameter greater than that of the first arc-shaped segment; a first straight segment; a third arc-shaped segment, the center of which is located outside the air duct; and Second straight line segment.

Optionally, from the inlet to the outlet of the air duct, the bottom wall of the air duct sequentially includes a plurality of segments connected tangentially, respectively: a third straight line segment extending horizontally from the inlet to the outlet of the air duct; a fourth arc-shaped segment; segment, the center of the circle is located inside the air duct and gradually extends upward from the end of the third straight segment; the fourth straight segment extends upward from the top of the fourth arc segment; the fifth arc segment, whose center is located outside the air duct, extends upward from the fourth straight segment The top extends upwards; the sixth arc-shaped segment, the center of the circle is located outside the air duct and the diameter is smaller than the fifth arc-shaped segment, and extends upward from the top of the fifth arc-shaped segment; the seventh arc-shaped segment, the center of the circle is located outside the air duct and the diameter is smaller than the sixth arc-shaped segment The arc-shaped segment extends upward from the top end of the sixth arc first and then toward the outlet of the air duct; and the fifth straight segment extends from the end of the seventh arc-shaped segment toward the outlet of the air duct and gradually slopes downward.

Optionally, the number of air inlets is one, and it is arranged on the bottom surface of the casing; and the fan is a laminar flow fan, its rotation axis extends vertically, and air is sucked from its axial bottom during operation, and is generated by the viscous effect of the air. Laminar wind blows radially outward.

Optionally, the heat exchanger is in the shape of a ring plate or a half ring plate with the axis extending in the vertical direction, and is arranged around the laminar flow fan at the radial outer side of the laminar flow fan.

Optionally, the laminar flow fan includes: a plurality of annular discs, which are arranged at intervals in parallel and are fixedly connected to each other, and the axes all extend vertically and are collinear; The discs are arranged at intervals in parallel and are indirectly fixed and connected, and the center of the circular disc is recessed downward to form a accommodating cavity; and a motor, which is directly or indirectly fixed to the housing and extends into the accommodating cavity, and its rotating shaft is connected with the circular discs , in order to drive the circular discs to rotate, thereby driving multiple annular discs to rotate, so that the air boundary layer on the surfaces of the multiple annular discs is driven by the multiple annular discs to rotate radially from the inside to the outside due to the viscous effect to form laminar airflow.

Optionally, the air duct member is in the shape of a casing with an open bottom, and an air duct is formed on the side thereof; the air duct member is covered on the bottom of the casing, so as to cover the heat exchanger and the fan therein.

Optionally, the ceiling-mounted air conditioner indoor unit further includes a bracket, which includes a horizontally arranged support ring and a plurality of connecting arms extending upward from the edge of the support ring, and the plurality of connecting arms are detachably connected to the air duct member; and the motor It is installed on the upper side of the support ring to be supported by it, and the rotating shaft of the motor protrudes downward from the center of the support ring.

Optionally, the air inlet is circular; the bottom wall of the casing around the air inlet is a drainage surface that starts radially outward from the edge of the air inlet and gradually extends downwards at the same time, and the drainage surface is a revolving surface coaxial with the air inlet. ; And the ceiling-mounted air conditioner indoor unit also includes a flow guide, which is arranged at the air inlet, and its outer peripheral surface is a revolving surface that expands radially outward from top to bottom and is coaxial with the air inlet for guiding indoor air. The air flows to the air inlet through the gap between the outer peripheral surface of the air guide and the bottom surface of the casing.

The ceiling-mounted air conditioner indoor unit of the utility model is hoisted on the roof, and the entire side of the shell is exposed, so that a plurality of air outlets can be arranged on the side, so as to realize the multi-directional air discharge from two sides, three sides, four sides, and even 360° in the circumferential direction. The wind, the air supply range is very large.

Further, the utility model utilizes the air duct to straighten out the air flow and then discharge it to the air outlet, thereby reducing the vortex generated at the air outlet, reducing the vortex noise, and reducing the total noise value. In addition, the setting of the air duct also makes the air flow more smoothly, reduces the power consumption, increases the air volume, and improves the efficiency of the air-conditioning air supply system. In addition, the tapered design of the flow cross section at the entrance of the air duct can effectively increase the wind speed and increase the air supply distance. After increasing the speed of the tapered section of the inlet section, the air flow enters the outlet section with a constant flow section to stabilize the flow, and the direction of the air flow can be further adjusted to make the air flow more stable and smooth.

Further, the ceiling-mounted air conditioner indoor unit of the present invention adopts a laminar flow fan, which is based on the principle of laminar flow, realizes the annular air outlet without dead angle, and facilitates the realization of multi-directional air supply of the indoor unit. In addition, the laminar flow fan uses the viscosity of the air boundary layer to do work, and the annular disc is basically parallel to the direction of airflow, which will not strongly disturb the impinging airflow and generate violent vortices, which greatly reduces the noise and has excellent noise quality, which improves the user experience.

Further, in the ceiling-mounted air conditioner indoor unit of the present invention, the wind flows from the gap between the air guide member and the housing to the air inlet. Compared with some schemes in which the wind enters the casing directly and vertically from the bottom of the casing, the direction of the air intake is close to the horizontal direction through the guidance of the air guide, so that the air can enter the laminar flow fan more smoothly, so that the layers The power consumption and noise of the flow fan are reduced. The design of the air guide also makes the appearance of the bottom of the air conditioner indoor unit more beautiful.

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

Description of drawings

Hereinafter, some specific embodiments of the present invention will be described in detail by way of example and not limitation with reference to the accompanying drawings. The same reference numbers in the figures designate the same or similar parts or parts. It will be understood by those skilled in the art that the drawings are not necessarily to scale. In the attached picture:

1 is a schematic structural diagram of a ceiling-mounted air conditioner indoor unit according to an embodiment of the present invention;

Fig. 2 is a schematic exploded view of the ceiling-mounted air conditioner indoor unit shown in Fig. 1;

3 is a sectional view obtained by cutting the ceiling-mounted air conditioner indoor unit shown in FIG. 1 along a vertical plane;

Fig. 4 is the top wall and bottom wall profile schematic diagram of the air duct in Fig. 3;

Fig. 5 is a schematic enlarged view of the fixing frame in Fig. 2;

Fig. 6 is the bottom view schematic diagram of the laminar flow fan;

7 is a schematic diagram of the air supply principle of a laminar flow fan;

Fig. 8 is the air circulation schematic diagram of the laminar flow fan of the embodiment shown in Fig. 1;

9 is a schematic diagram of the air circulation of a laminar flow fan according to another embodiment of the present invention;

10 is a schematic diagram of the air circulation of a laminar flow fan according to another embodiment of the present invention;

FIG. 11 is a schematic diagram showing the relationship between the gradual change in the pitch of the plurality of annular disks of the laminar flow fan shown in FIG. 10 and the air volume and air pressure.

Detailed ways

The ceiling-mounted air conditioner indoor unit according to the embodiment of the present invention will be described below with reference to FIGS. 1 to 11 . Wherein, the orientation or positional relationship indicated by "front", "rear", "upper", "lower", "top", "bottom", "inside", "outside", "horizontal", etc. The orientation or positional relationship is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a reference to the present utility model. limits.

The ceiling-mounted air conditioner indoor unit and the air conditioner outdoor unit (not shown) of the embodiment of the present invention together constitute a vapor compression refrigeration cycle system to achieve cooling/heating of the indoor environment.

1 is a schematic structural diagram of a ceiling-mounted air conditioner indoor unit according to an embodiment of the present invention; FIG. 2 is a schematic exploded view of the ceiling-mounted air conditioner indoor unit shown in FIG. 1 ; A cross-sectional view of the ceiling-mounted air conditioner indoor unit is shown.

As shown in FIGS. 1 to 3 , the ceiling-mounted air conditioner indoor unit may generally include a casing 100 , a heat exchanger 400 , a fan 300 and an air duct member 180 .

The ceiling-mounted air conditioner indoor unit is hung under the indoor roof as a whole, and the top of the casing 100 is used for connecting with the roof. The casing 100 is provided with at least one air inlet 110 and at least one air outlet 120 . The air outlet 120 is located on the side of the casing 100 . The air inlet 110 may be located on the bottom surface of the casing 100 as shown in FIG. 1 to FIG. 3 , or may be located on the side surface of the casing 100 .

The number of air outlets 120 can be set as required. For example, if the indoor unit is to be installed on the roof near the side wall, only one air outlet can be provided. If the installation position of the indoor unit is far away from the side wall, such as in the center of the roof, multiple air outlets with different orientations such as two, three, four, etc. Multi-directional air supply effect such as air outlet. Even, the casing can be made into a circular shape, and air outlets are provided at all angles in the circumferential direction for air outlet, so as to achieve 360° all-round air supply.

A heat exchanger 400 is disposed within the housing 100, which may be an evaporator of a vapor compression refrigeration cycle.

The fan 300 is arranged in the casing 100, and is used to inhale the indoor air through the air inlet 110, so that it exchanges heat with the heat exchanger 400 to form heat exchange air (when cooling, the heat exchange air is cold air, and when heating, the heat exchange air is hot air), and blow the heat exchange air back into the room through the air outlet 120 to achieve cooling/heating of the room.

The air duct member 180 is provided in the housing 100 and includes at least one air duct 182 . The number of the air ducts 182 and the number of the air outlets 120 are the same and correspond one-to-one. The function of the air duct 182 is to guide the heat exchange air to the corresponding air outlet 120 . And, the air duct 182 is divided into an inlet section and an outlet section along the flow direction of the airflow, and the flow cross section of the inlet section tapers along the flow direction of the heat exchange air. That is, when the airflow just enters the air duct 182 and flows outward, the air duct 182 becomes narrower and narrower.

In the above embodiment, the air duct 182 is used to straighten out the air flow and then discharge it to the air outlet 120, which reduces the vortex flow generated at the air outlet 120, reduces the vortex flow noise, and reduces the total noise value. In addition, the air duct also makes the air flow more smoothly, reduces the power consumption, increases the air volume, and improves the efficiency of the air supply system. In addition, the tapered design of the flow cross section at the entrance of the air duct can effectively increase the wind speed and increase the air supply distance.

Further, the flow cross section of the air duct 182 at its outlet section can also be kept unchanged along the flow direction of the heat exchange air. That is, just before the airflow flows out of the air duct 182, the width of the air duct 182 remains unchanged. This enables the airflow to increase in speed through the tapered section of the inlet section, and then enter the outlet section with a constant section to stabilize the flow, which can further adjust the airflow direction to make the airflow more stable and smooth.

FIG. 4 is a schematic diagram of the profile line of the top wall and bottom wall of the air duct in FIG. 3 . The shapes of the top and bottom walls of the air duct 182 are refined, so that the shape lines of the air duct 182 can better meet the original design intent, that is, to obtain better effects of drainage, steady flow and eddy current prevention.

The two walls in the width direction of the air duct 182 are symmetrical with respect to the central vertical plane in the width direction thereof, as shown in FIG. 2 . Therefore, in this embodiment, the change of the area of the flow cross section of the air duct is realized by the change of the profile of the top wall and the bottom wall of the air duct.

As shown in FIG. 4 , the cross-section of the two points BR is the inlet cross-section of the air duct 182 , and the cross-section of the GJ two points is the outlet cross-section of the air duct 182 . The space area enclosed by BRKF is the inlet section of the air duct 182 , and the space area enclosed by FKJG is the outlet section of the air duct 182 .

From the inlet to the outlet of the air duct 182 (the r direction indicated by the arrow), the top wall of the air duct 182 is sequentially formed of a plurality of sections that are tangentially connected. And, each section extends in a direction toward the outlet of the air duct 182 while gradually sloping downward. The plurality of segments include: a first arcuate segment BC, a second arcuate segment CD, a first straight segment DE, a third arcuate segment EF, and a second straight segment FG. The centers of the first arc-shaped segment BC and the second arc-shaped segment CD are both located inside the air duct 182 , and the diameter of the second arc-shaped segment CD is larger than the diameter of the first arc-shaped segment BC. The dotted circle C1 in the figure is the circle where the first arc segment BC is located. The circle C2 is the circle where the second arc segment CD is located. The center of the third arc segment EF is located outside the air duct 182 .

The profile line of the top wall of the air duct is set so that the airflow near the top wall first enters the BC section slowly, after the transition of the CD section, the section rapidly shrinks in the DE section to accelerate, and then transitions to the gentle FG section through the turning of the EF section. Realize steady flow blowing.

From the inlet to the outlet of the air duct 182 , the bottom wall of the air duct 182 sequentially includes a plurality of tangentially connected segments, which are the third straight segment RQ, the fourth arc segment QP, the fourth straight segment PN, and the fifth arc segment. shape segment NM, sixth arc segment ML, seventh arc segment LK and fifth straight line segment KJ. Wherein, the third straight section RQ extends horizontally from the inlet to the outlet of the air duct. The center of the fourth arc-shaped segment QP is located inside the air duct 182 and gradually extends upward from the end of the third straight segment RQ. The fourth straight segment PN extends upward from the top end of the fourth arcuate segment QP. The center of the fifth arc segment NM is located outside the air duct 182 and extends upward from the top end of the fourth straight segment PN. The center of the sixth arc-shaped segment ML is located outside the air duct 182 and has a diameter smaller than that of the fifth arc-shaped segment NM, and extends upward from the top end of the fifth arc-shaped segment NM. The center of the seventh arc segment LK is located outside the air duct 182 and has a diameter smaller than that of the sixth arc segment ML, and extends upward from the top of the sixth arc ML and then toward the outlet of the air duct 182 . The fifth straight section KJ extends from the end of the seventh arc section LK toward the outlet of the air duct 182 and gradually slopes downward, and LK may be parallel to FG. The dotted circle C6 is the circle where the fifth arc segment NM is located, and the dotted circle C5 is the circle where the sixth arc segment ML is located. The dotted circle C4 is the circle where the seventh arc segment LK is located.

The profile line of the bottom wall of the air duct is set so that the airflow near the bottom wall first slowly enters the RQ section, and after the smooth transition of the QP section, it enters the PN, NM, and ML sections. The turning of the segment, the transition to a gentle KJ segment achieves steady flow blowing.

The number of air inlets 110 is one, and it is provided on the bottom surface of the casing 100 . An optional structure of the housing 100 is shown in FIG. 2 , which includes a square bottom case 150 with an open upper side and a square top cover 130 with an open lower side, and the two covers are fastened together to define an accommodating space. The aforementioned air outlet 120 is opened on the side surface of the bottom case 150 . The number of the air outlets 120 may be three, and one of the air outlets 120 is provided on each of the four sides of the bottom case 150 . The bottom surface of the bottom case 150 is provided with an air inlet 110 .

The fan 300 can be a laminar flow fan, its rotation axis extends vertically, and the bottom is opposite to the air inlet 110, so that air is sucked in from its axial bottom during operation, and then laminar flow wind is generated by the viscous effect of the air and blown out along its radial direction. , so as to enter the air duct 182 .

The heat exchanger 400 is preferably a ring-shaped or semi-ring-shaped (circular ring, semi-circular ring, square ring, irregular ring or U-shaped ring as shown in FIG. 2 ) with the axis extending in the vertical direction, It is arranged around the laminar flow fan at the radial outer side of the laminar flow fan, so there is no need to set it above or below the laminar flow fan, which can save the internal space of the ceiling-mounted air conditioner indoor unit, make the structure more compact, and make the whole machine more compact. Smaller size. In addition, the heat exchanger 400 surrounds the laminar flow fan, so that the airflow of the laminar flow fan can pass through the surface of the heat exchanger 400 more quickly and comprehensively, so that the heat exchange and heat exchange efficiency of the heat exchanger 400 are greatly improved.

Figure 6 is a schematic bottom view of a laminar flow fan. As shown in FIGS. 2 , 3 and 6 , the laminar flow fan includes a plurality of annular disks 10 , a motor 20 and a circular disk 30 . A plurality of annular disks 10 are arranged in parallel and spaced apart and fixedly connected to each other, and the axes all extend vertically and are collinear. The circular disk 30 is located at the top of the laminar flow fan, and is arranged in parallel with the uppermost annular disk 10 and is indirectly fixedly connected. A plurality of connecting rods 40 extending vertically can be provided, and one end of the connecting rods 40 is fixed to the circular disk 30, and then vertically extends to penetrate through the plurality of annular disks 10, and is fixed with each annular disk 10 to realize The plurality of annular disks 10 and the circular disks 30 are fixed to each other. The center of the circular disk 30 is recessed downward to form a accommodating cavity 31 . The motor 20 is directly or indirectly fixed to the casing 100 and extends into the accommodating cavity 31 for driving the plurality of annular discs 10 to rotate, so that the air boundary layers on the surfaces of the plurality of annular discs 10 are removed by the plurality of annular discs 10 due to the viscous effect. The annular disc 10 is driven to rotate and move radially from the inside to the outside to form a laminar airflow.

The laminar flow fan is an axial air inlet and radial air outlet structure. It inhales in the axial direction, and blows out the air in the radial direction to just blow the wind horizontally to each air outlet 120 . The laminar flow fan is based on the principle of laminar flow, and realizes the annular air without dead angle. In addition, the laminar flow fan uses the viscosity of the air boundary layer to do work, and the annular disc 10 is basically parallel to the flow direction of the airflow, and will not strongly disturb the impact airflow to generate violent vortices, so that the noise is greatly reduced and the noise quality is excellent, which significantly improves the user experience. . The more specific principle and structure of the laminar flow fan will be introduced in detail later.

As shown in FIG. 2 , the air duct member 180 can be in the shape of a casing with an open bottom, and the aforementioned air duct 182 is formed on the side thereof. The air duct member 180 is fastened on the bottom of the housing 100 to cover the heat exchanger 400 and the fan 300 therein, so that the heat exchange air can only flow to the air outlet 120 through the air duct 182 so as to be blown out more smoothly.

As shown in FIG. 2 , a support plate 800 is also fixedly installed in the casing 100 . The pallet 800 is installed on the inner bottom side of the housing 100 . The heat exchanger 400 is mounted on the pallet 800 to be supported by it. The peripheral edge of the support plate 800 is in sealing contact with the inner wall of the housing 100 , and a vent 801 opposite to the air inlet 110 is opened in the center to allow the intake air to flow to the bottom of the laminar flow fan through the vent 801 . Furthermore, as shown in FIG. 3 , after the intake air passes through the vent 801, all of it is sucked into the laminar flow fan, and will not flow directly to the heat exchanger 400 without the action of the laminar flow fan, thereby affecting the heat exchange efficiency.

FIG. 5 is a schematic enlarged view of the bracket of FIG. 2 . As shown in FIGS. 2 , 3 and 5 , the ceiling-mounted air conditioner indoor unit includes a bracket 50 . The bracket 50 includes a horizontally arranged support ring 51 and a plurality of connecting arms 52 (at least two, such as three shown in FIG. 5 ). The support ring 51 is a hollow annular shape. The connecting arm 52 extends upward from the edge of the support ring 51 , and the upper end of the connecting arm 52 is detachably connected to the air duct member 180 , specifically, a screw connection can be adopted. The motor 20 is placed on the upper side of the support ring 51 to be supported by it, and the rotating shaft 21 of the motor 20 protrudes downward from the center of the support ring 51 . In this way, the support ring 51 bears the weight of the entire laminar flow fan by supporting the motor 20 .

As shown in FIGS. 1 and 3 , each air outlet 120 is provided with at least one wind deflector 600 for guiding the wind direction. The wind deflector 600 is in the shape of a long strip whose longitudinal direction is parallel to the horizontal direction, and its rotation axis is parallel to its longitudinal direction. When a plurality of wind deflectors 600 are provided, the plurality of wind deflectors 600 are arranged from top to bottom.

The air deflector 600 can be rotated to open or close the air outlet 120 , and the air outlet direction of the air outlet 120 can be changed by rotating the air deflector 600 to different angles. The wind deflector 600 may be driven to rotate by a motor or other structures, and details are not repeated here.

As shown in FIGS. 1 to 3 , the air inlet 110 is circular, and its central axis is the X axis. The bottom wall of the casing 100 around the air inlet 110 is a drainage surface 140 extending radially outward from the edge of the air inlet 110 and gradually extending downwards at the same time. When a plane curve (single curvature, the curve plane is not perpendicular to the rotation axis) or a space curve (double curvature) revolves around a fixed line (rotation axis), a surface of revolution is formed in space.

The air guide 200 is disposed at the air inlet 110 , and its outer peripheral surface 201 is a revolving surface that expands radially outward from top to bottom and is coaxial with the air inlet 110 , and is used to guide indoor air through the outer peripheral surface of the air guide 200 The gap between 201 and the bottom surface of the casing 100 flows toward the air inlet 110 .

Compared with the solution in which the wind enters the casing 100 directly and vertically upward from the bottom of the casing 100 , the air guide 200 is provided in the embodiment of the present invention, so that the wind flows from the gap between the air guide 200 and the bottom surface of the casing 100 to the inlet. The air inlet 110 makes the air intake direction close to the horizontal direction, so that the air can enter the laminar flow fan more smoothly (because the annular disk 10 of the laminar flow fan extends horizontally), so that the energy consumption and noise of the laminar flow fan are reduced. In addition, the arrangement of the air guide 200 also makes the appearance of the bottom of the ceiling-mounted indoor unit (the bottom of which mainly faces the user) more beautiful, and avoids the appearance of a complicated air inlet grille arranged at the bottom of the casing 100 from affecting the appearance.

FIG. 7 is a schematic diagram of the air supply principle of the laminar flow fan. As shown in Figure 7, the air supply principle of the laminar flow 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 annular disc 10 rotates at a high speed, and the air in the interval 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 affected by the viscous shear force τ, and the rotating annular disc 10 is driven to rotate and move from the inside to the outside to form a laminar wind.

FIG. 8 is a schematic diagram of the air circulation of the laminar flow fan of the embodiment shown in FIG. 1 . As shown in FIG. 8 , an air inlet channel 11 is formed in the center of the annular disk 10 to allow outside air to enter. A plurality of air outlet channels 12 are formed in the gaps between the plurality of annular disks 10 for the laminar flow air to be blown out. The process that the air boundary layer 13 rotates from the inside to the outside to form laminar wind is centrifugal motion, so the speed when leaving the air outlet channel 12 is greater than the speed when entering the air inlet channel 11 .

9 is a schematic diagram of the air circulation of a laminar flow fan according to another embodiment of the present invention. In some embodiments, the inner diameters of the annular disks of the laminar flow fan can be varied. For example, as shown in FIG. 9 , along the axial air inlet direction of the laminar flow fan (from bottom to top according to the embodiment shown in FIGS. 1 to 8 ), the inner diameters of the plurality of annular disks 10 are sequentially reduced. In other words, along the direction in which the airflow flows in the air inlet passage 11 , the inner diameter of the annular disk 10 is gradually reduced. In this way, when the air enters the air inlet channel 11 from top to bottom, the airflows at different positions in the radial direction correspond to different annular discs 10 respectively, which can make the air flow to each annular disc more uniformly and avoid air It is difficult to enter the annular disc on the upper side, and finally achieve the effect of increasing the air volume.

FIG. 10 is a schematic diagram of the air circulation of the laminar flow fan according to another embodiment of the present invention, and FIG. 11 is a schematic diagram of the relationship between the gradual change of the spacing between the annular discs of the laminar flow fan shown in FIG. 10 and the air volume and air pressure.

In other embodiments, the distances between adjacent annular disks of the laminar flow fan may also be different. As shown in FIG. 9 , the distance between the two adjacent annular discs 10 can be gradually increased along the axial air inlet direction of the laminar flow fan. In other words, along the direction in which the air flows in the air inlet channel 11, the distance between each adjacent two annular disks gradually increases. After many experiments, the inventor found that this setting can effectively increase the air volume of the laminar flow fan. Refer specifically to FIG. 10 .

In Fig. 11 , the shrinking uniform expanding Plate distance increase on the abscissa axis refers to the change in the distance between two adjacent annular plates 10 along the bottom-to-top direction, the mass flowrate on the left ordinate axis refers to the air volume, and the right ordinate axis refers to the air volume. The ordinate axis Pressure rise refers to the wind pressure, and the wind pressure refers to the pressure difference between the air outlet channel 12 of the laminar flow fan and the inlet of the air inlet channel 11 . In addition, the variation of the distance between two adjacent annular discs 10 is the same, that is, the increase or decrease of the distance between the adjacent two annular discs 10 is the same.

Specifically, FIG. 11 shows that when the outer diameter, inner diameter, number, thickness, and rotational speed of the motor 20 of the annular discs 10 of the laminar flow fan remain unchanged, the pitch of the plurality of annular discs 10 changes gradually with the air volume and air pressure. Relationship diagram. When the above-mentioned parameters remain unchanged, among the plurality of annular discs 10, the gradual change of the spacing between each two adjacent annular discs 10 has a greater influence on the air volume and little influence on the wind pressure. . When the variation of the distance between two adjacent annular discs 10 along the axial air inlet direction represented by the abscissa axis is a positive number, it means that the aforementioned distance gradually increases; In the wind direction, when the variation of the distance between two adjacent annular disks 10 is a negative number, it means that the aforementioned distance gradually decreases. The variation of the distance between two adjacent annular disks 10 can be made the same. It can be seen from FIG. 11 that when the variation of the spacing between each two adjacent annular discs 10 in the plurality of annular discs 10 is -1 mm, 1 mm and 2 mm, the air volume and air pressure of the laminar flow fan are greatly improved. .

Considering the air volume and air pressure of the laminar flow fan, it is preferable to set the distance between every two adjacent annular discs 10 in the plurality of annular discs 10 to gradually increase along the axial air intake direction. For example, the outer diameter of the annular disc 10 is 175 mm, the inner diameter of the annular disc 10 is 115 mm, the number of annular discs 10 is 8, the thickness of the annular disc 10 is 2 mm, and the rotational speed of the motor 20 is 1000 rpm (revolutions per minute, revolutions per minute). /min), at this time, the air volume and air pressure of the laminar flow fan are comprehensively considered. For example, the distance between two adjacent annular discs 10 of the 8 annular discs 10 can be set as follows along the axial air inlet direction: 13.75 mm, 14.75mm, 15.75mm, 16.75mm, 17.75mm, 18.75mm, 19.75mm.

By now, those skilled in the art will recognize that although various exemplary embodiments of the present invention have been shown and described in detail herein, without departing from the spirit and scope of the present invention, Numerous other variations or modifications consistent with the principles of the present invention are directly identified or derived from the disclosure of the present invention. Accordingly, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims (10)

1. A ceiling-mounted air conditioner indoor unit is characterized in that comprising: a casing, having at least one air inlet and at least one air outlet, the air outlet is located on the side of the casing; a heat exchanger, arranged in the shell; The fan is installed in the casing and is used to inhale indoor air through the air inlet to form heat exchange air after heat exchange with the heat exchanger, and blow the heat exchange air back into the room through the air outlet ;and an air duct component, disposed in the casing, and provided with at least one air duct corresponding to the at least one air outlet one-to-one, for guiding the heat exchange air to each of the air outlets; and The flow cross section of the air duct at its inlet section tapers in the flow direction of the heat exchange air. 2. The ceiling-mounted air conditioner indoor unit according to claim 1, characterized in that, The flow cross section of the air duct in its outlet section remains unchanged in the flow direction of the heat exchange air. 3. The ceiling-mounted air conditioner indoor unit according to claim 2, wherein From the inlet to the outlet of the air duct, the top wall of the air duct is sequentially connected with a plurality of sections that are tangentially connected, and each section extends toward the outlet of the air duct while gradually inclining downward. Sections include: the first arc segment, the center of which is located inside the air duct; a second arc-shaped segment, the center of which is located inside the air duct, and the diameter is larger than that of the first arc-shaped segment; the first straight line segment; a third arcuate segment, the center of which is located outside the air duct; and Second straight line segment. 4. The ceiling-mounted air conditioner indoor unit according to claim 3, wherein From the inlet to the outlet of the air duct, the bottom wall of the air duct sequentially includes a plurality of tangentially connected sections, which are: The third straight line segment extends horizontally from the inlet to the outlet of the air duct; a fourth arc-shaped segment, the center of which is located inside the air duct, and gradually extends upward from the end of the third straight-line segment; a fourth straight segment extending upward from the top end of the fourth arc segment; a fifth arc-shaped segment, the center of which is located outside the air duct and extends upward from the top of the fourth straight-line segment; a sixth arc-shaped segment, the center of which is located outside the air duct, the diameter is smaller than that of the fifth arc-shaped segment, and extends upward from the top end of the fifth arc-shaped segment; a seventh arc-shaped segment, the center of which is located outside the air duct and the diameter is smaller than that of the sixth arc-shaped segment, and extends upward from the top end of the sixth arc first and then toward the outlet of the air duct; and The fifth straight segment extends from the end of the seventh arc segment toward the outlet direction of the air duct and gradually slopes downward. 5. The ceiling-mounted air conditioner indoor unit according to claim 1, wherein The number of the air inlet is one, and it is arranged on the bottom surface of the housing; and The fan is a laminar flow fan, the rotation axis of which extends vertically, and air is sucked in from the bottom of the axial direction during operation, and the laminar flow wind is generated by the viscous effect of the air and blown out along its radial direction. 6. The ceiling-mounted air conditioner indoor unit according to claim 5, wherein The heat exchanger is in the shape of a ring plate or a half ring plate with an axis extending in a vertical direction, and is arranged around the laminar flow fan at the radial outer side of the laminar flow fan. 7. The ceiling-mounted air conditioner indoor unit according to claim 5, wherein the laminar flow fan comprises: a plurality of annular disks, which are arranged in parallel and at intervals and are fixedly connected to each other, and the axes all extend vertically and are collinear; a circular disc, located at the top of the laminar flow fan, arranged in parallel with the uppermost annular disc and indirectly fixedly connected, the center of the circular disc is recessed downward to form a accommodating cavity; and a motor, which is directly or indirectly fixed to the casing, and extends into the accommodating cavity, and its rotating shaft is connected to the circular disc, so as to drive the circular disc to rotate, thereby driving the plurality of annular When the discs rotate, the air boundary layers on the surfaces of the plurality of annular discs are driven by the plurality of annular discs to rotate radially from the inside to the outside due to the viscous effect to form laminar airflow. 8. The ceiling-mounted air conditioner indoor unit according to claim 7, wherein The air duct member is in the shape of a casing with an open bottom, and the air duct is formed on the side thereof; The air duct member cover is fastened on the bottom of the casing so as to cover the heat exchanger and the fan therein. 9. The ceiling-mounted air conditioner indoor unit according to claim 8, further comprising: a bracket, which comprises a horizontally arranged support ring and a plurality of connecting arms extending upward from the edge of the support ring, the plurality of connecting arms being detachably connected to the air duct member; and The motor is installed on the upper side of the support ring to be supported by it, and the rotating shaft of the motor protrudes downward from the center of the support ring. 10. The ceiling-mounted air conditioner indoor unit according to claim 5, characterized in that, The air inlet is circular; The bottom wall of the casing around the air inlet is a drainage surface that starts radially outward from the edge of the air inlet and at the same time gradually slopes downwards, and the drainage surface is a rotating surface coaxial with the air inlet ;and The ceiling-mounted air conditioner indoor unit also includes a flow guide, which is arranged at the air inlet, and its outer peripheral surface is a revolving surface that gradually expands radially outward from top to bottom and is coaxial with the air inlet. In order to guide indoor air to flow to the air inlet through the gap between the outer peripheral surface of the air guide and the bottom surface of the casing.

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