CN111442378A

CN111442378A - Ceiling type air conditioner indoor unit

Info

Publication number: CN111442378A
Application number: CN201910045466.6A
Authority: CN
Inventors: 戴现伟; 王永涛; 吕静静; 孙亚琼; 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: 2020-07-24
Anticipated expiration: 2039-01-17
Also published as: CN111442378B

Abstract

The invention provides a ceiling type air conditioner indoor unit, which comprises a shell, a fan and a fan, wherein the shell is provided with a circular air inlet and an air supply outlet, the bottom wall of the shell around the air inlet is a flow guide surface which starts from the edge of the air inlet, is radially outward and gradually extends downwards in a downward inclined mode, and is a revolution surface coaxial with the air inlet; the laminar flow fan is arranged in the shell and comprises a plurality of annular discs which are arranged in parallel at intervals, fixedly connected with each other and vertically extended along the axis; the flow guide piece is arranged at the air inlet, the outer peripheral surface of the flow guide piece is a rotary surface which is gradually expanded from top to bottom and is coaxial with the air inlet, so that air is guided to flow to the air inlet through a gap between the outer peripheral surface of the flow guide piece and the bottom surface of the shell; the drainage surface sequentially comprises an arc transition section, an arc pressurizing section and an arc expanding section which are smoothly connected from inside to outside in the radial direction; the peripheral surface of the flow guide piece sequentially comprises a straight line inclined section, an upper arc section and a lower arc section which are smoothly connected from top to bottom; the distance between the top end of the arc transition section and the top end of the lower arc section is smaller than the distance between the bottom end of the arc extension section and the bottom end of the lower arc section.

Description

Ceiling type air conditioner indoor unit

Technical Field

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

Background

Conventional household air conditioners are typically cabinet or on-hook. Indoor units of cabinet air conditioners and on-hook units typically have only one supply air outlet to supply air to the room. In addition, the cabinet machine and the hanging machine are limited by the structure, the air can be supplied in only one direction, and the air supply direction is single.

In addition, although the air guide plate and the swing blade are used for guiding air, the air supply range of the traditional cabinet air conditioner or the conventional on-hook air conditioner is still not large.

Disclosure of Invention

One object of the present invention is to provide an indoor unit of an air conditioner capable of multi-angle and omni-directional air supply.

The invention also aims to stabilize and pressurize the air flow entering the air inlet of the indoor unit of the ceiling type air conditioner, so that the eddy loss is reduced, the air inlet is smoother and the wind resistance is reduced.

In particular, the present invention provides a ceiling type air conditioner indoor unit, comprising:

the bottom of the shell is provided with a circular air inlet, the side part of the shell is provided with at least one air supply outlet, the bottom wall of the shell around the air inlet is a flow guide surface which starts from the edge of the air inlet and extends outwards in the radial direction and gradually inclines downwards, and the flow guide surface is a revolution surface coaxial with the air inlet;

the laminar flow fan is arranged in the shell and comprises a plurality of annular disks which are arranged in parallel at intervals, fixedly connected with each other, vertically extended in axial line and coaxial with the air inlet; and

the flow guide piece is arranged at the air inlet, the peripheral surface of the flow guide piece is a revolution surface which is gradually expanded from top to bottom and is radially outward and coaxial with the air inlet, and the flow guide piece is used for guiding indoor air to flow to the air inlet through a gap between the peripheral surface of the flow guide piece and the bottom surface of the shell; and is

The drainage surface sequentially comprises an arc transition section, an arc pressurizing section and an arc expanding section which are smoothly connected from inside to outside in the radial direction;

the peripheral surface of the flow guide piece sequentially comprises a straight line inclined section, an upper arc section and a lower arc section which are smoothly connected from top to bottom;

the distance between the top end of the arc transition section and the top end of the lower arc section is smaller than the distance between the bottom end of the arc extension section and the bottom end of the lower arc section.

Optionally, the top end of the arc transition section, the bottom end of the lower arc section and the radial inner end of the annular disk at the lowest side are positioned in the same vertical plane; the bottom end of the arc-shaped expansion section and the radial outer end of the annular disc at the lowest side are positioned in the same vertical plane; the top end of the lower arc-shaped section is lower than the annular disc at the lowest side; the top end of the upper arc-shaped section is higher than the annular disc at the lowest side.

Optionally, setting the distance between the two lowermost annular disks as y; the distances from the top end of the arc transition section, the top end of the arc pressurizing section, the top end and the bottom end of the arc expanding section to the bottom surface of the annular disc at the lowest side are m, n, t and p respectively; the radii of the arc transition section, the arc pressurizing section and the arc expanding section are r1, r2 and r3 respectively; the parameters satisfy the following relations: y is more than or equal to m, n is more than or equal to 1.5y and less than or equal to 2y, t is more than or equal to 2y and less than or equal to 2.3y, p is more than or equal to 2.5y and less than or equal to 3y, r1 and r2 are more than or equal to 1.2r1, and r3 and 3.5r1 are more than or equal to 4.5r 1.

Optionally, the radius of the lower arc-shaped segment is r4, and the distance between the top end and the bottom end of the lower arc-shaped segment and the bottom surface of the annular disc at the lowest side is q and h respectively; the parameters satisfy the following relations: q is more than or equal to 4.5y and less than or equal to 5.5y, h is more than or equal to 1.8y and less than or equal to 2.2y, and r4 is r 3.

Optionally, the radius of the upper arc-shaped segment is r5, and the distance between the top end of the upper arc-shaped segment and the bottom surface of the annular disc at the lowest side is k, and each parameter satisfies the following relation: k is more than or equal to 0.6y and less than or equal to 0.7y, r5 is more than or equal to 3.5r1 and less than or equal to 4.5r 1.

Alternatively, the diversion member can rotate around a self-rotating shaft so as to utilize the viscosity effect of the surface air on the outer peripheral surface of the diversion member when the diversion member is driven to rotate to drive the indoor air to accelerate to enter the air inlet.

Optionally, the laminar flow fan further comprises: the circular disk is arranged above the annular disk at the uppermost side, is arranged at intervals and is fixedly connected with the annular disk, and the center of the circular disk is sunken downwards to form an accommodating cavity; and the motor is positioned in the accommodating cavity, the top of the motor is fixed on the shell, the bottom of the motor extends out of the rotating shaft which is connected with the circular disk to drive the circular disk to rotate, so that the plurality of annular disks are driven to rotate, and an air boundary layer close to the surface of the annular disks is driven by the annular disks to rotate from inside to outside due to the viscous effect to form laminar air.

Optionally, the top of the diversion member is fixedly connected to the lower side of the circular disk to rotate synchronously with the circular disk under the driving of the circular disk.

Alternatively, for any adjacent two annular disks, the inner circle diameter of the annular disk located on the upper side is smaller than the inner circle diameter of the annular disk located on the lower side.

Optionally, the heat exchanger is between the laminar flow fan and the supply air outlet and surrounds the laminar flow fan.

The indoor unit of the ceiling type air conditioner realizes all-dimensional and multi-angle air supply by utilizing the plurality of air supply outlets on the side part. Because a plurality of air outlets simultaneously discharge air, the noise problem is more prominent, the laminar flow fan is selected, the running noise of the laminar flow fan is smaller, and the noise problem of the whole air conditioner can be relieved to a certain extent.

Furthermore, in the ceiling type air conditioner indoor unit, air flows to the air inlet from the position between the outer peripheral surface of the flow guide piece and the flow guide surface of the shell, so that the air inlet direction is close to the horizontal direction, and the air can enter the laminar flow fan more smoothly.

Furthermore, the shapes of the outer peripheral surface of the flow guide part and the flow guide surface are limited, so that the cross section of the air inlet is gradually reduced along the air inlet direction, the cross section of the air inlet is minimum, the air flow rate is highest, a Venturi effect is formed, and the air is accelerated to enter the shell.

Furthermore, in the rotating process of the flow guide piece, air on the surface layer of the outer peripheral surface of the flow guide piece can rotate along with the flow guide piece due to the viscous effect, and the air around the flow guide piece is driven to form a centrifugal trend so as to enter the shell at an accelerated speed, thereby assisting air inlet. Meanwhile, the flow guide piece also has the functions of stabilizing the air inlet flow form and reducing the eddy loss.

Furthermore, for any two adjacent annular disks, the diameter of the inner circle of the annular disk positioned on the upper side is smaller than that of the inner circle of the annular disk positioned on the lower side, so that air flows to each annular disk more uniformly and smoothly, the air quantity is increased, and the operation efficiency of the fan is improved.

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

Drawings

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

fig. 1 is a schematic view illustrating a ceiling type air conditioner indoor unit according to an embodiment of the present invention;

fig. 2 is a cross-sectional view of the ceiling type indoor unit of the air conditioner shown in fig. 1, cut away in a vertical cross-sectional view;

FIG. 3 is a schematic view of the laminar flow fan, the housing flow directing surfaces, and the shape of the flow guide;

FIG. 4 is a schematic diagram showing the dimensional relationships of the laminar flow fan, the flow guide surface of the housing and the outer peripheral surface of the flow guide member;

FIG. 5 is a bottom perspective view of a laminar flow fan;

FIG. 6 is a schematic diagram of the air supply principle of the laminar flow fan;

FIG. 7 is a schematic cross-sectional view of a plurality of annular disks of a laminar flow fan;

fig. 8 is a schematic view of air circulation of a laminar flow fan.

Detailed Description

A ceiling type air conditioning indoor unit according to an embodiment of the present invention will be described with reference to fig. 1 to 8. Where the orientations or positional relationships indicated by the terms "front," "back," "upper," "lower," "top," "bottom," "inner," "outer," "lateral," and the like are based on the orientations or positional relationships shown in the drawings, the description is for convenience only and to simplify the description, and no indication or suggestion is made that the device or element so indicated must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the invention.

The ceiling type air conditioner indoor unit and the air conditioner outdoor unit (not shown) of the embodiment of the invention form a vapor compression refrigeration cycle system together, so that the indoor environment can be cooled/heated.

Fig. 1 is a schematic view illustrating a ceiling type air conditioner indoor unit according to an embodiment of the present invention; fig. 2 is a cross-sectional view of the ceiling type indoor unit of the air conditioner shown in fig. 1, which is cut in a vertical cross-sectional view.

As shown in fig. 1 and 2, a ceiling type air conditioning indoor unit according to an embodiment of the present invention may generally include a case 100, a heat exchanger 400, a laminar flow fan 300, and a guide 200.

The ceiling type air conditioning indoor unit is integrally suspended below an indoor roof, and the top of the casing 100 is used for being connected with the roof. The housing 100 has an air inlet 110 at the bottom and at least one air blowing opening 120 at the side. The number of the blowing ports 120 may be one or more. For example, if the indoor unit is installed on a roof near a side wall, only one air supply opening may be provided. If the side wall is kept away from to the mounted position of this indoor set, if set up in roof central authorities, can set up like a plurality of air supply outlets towards the diverse such as 2, 3, 4 to realize multi-angle air supply effects such as two-sided air-out, trilateral air-out, four sides air-out. As shown in fig. 1, the casing 100 is rectangular as a whole, and four side portions of the casing 100 are respectively provided with one air blowing port 120 to realize air blowing in four directions. Even, the casing 100 may be circular, and the air outlets may be formed at all circumferential angles for air outlet, so as to realize 360 ° all-directional air supply. In addition, because of the higher mounted position of the indoor unit of the ceiling type air conditioner, the air-out coverage range is also very large, the refrigerating/heating speed is favorably improved, and the user feels more comfortable.

Disposed within the housing 100 is a heat exchanger 400, which may be an evaporator of a vapor compression refrigeration cycle. When the air conditioner is turned on, indoor air enters the casing 100 from the air inlet 110, flows through the heat exchanger 400, exchanges heat with the heat exchanger 400 to become heat-exchange air (the heat-exchange air is cold air during cooling, and the heat-exchange air is hot air during heating), and the heat-exchange air is blown back to the indoor space from the air supply outlet 120 to realize indoor cooling/heating.

A laminar flow fan 300 is disposed within the housing 100 for powering the airflow flow process described above. The laminar flow fan 300 includes a plurality of annular disks 10. The plurality of annular disks 10 are arranged in parallel at intervals, fixedly connected with each other, and have axes extending in the vertical direction and coaxial with the air inlet 110. The laminar flow fan 300 operates to generate laminar flow wind by utilizing the viscosity of air with the surface of the ring disk 10. Laminar flow fan 300 is the axial air inlet, radial air-out structure. The bottom of the air intake unit is used for supplying air to absorb indoor air from the air intake opening 110, and the air intake unit is used for radially discharging air to blow air horizontally to the air discharge openings 120. Fig. 2 illustrates the air flow direction by arrows.

The ceiling type air conditioner indoor unit is provided with the plurality of air supply outlets 120 for simultaneously supplying air, so that the noise problem is more prominent, the running noise of the laminar flow fan 300 is smaller, and the noise problem of the whole air conditioner can be relieved to a certain degree.

In some embodiments, as shown in fig. 2, the heat exchanger 400 may be located between the laminar flow fan 300 and the supply air outlet 120 and surround the laminar flow fan 300, so that the airflow passes through the surface of the heat exchanger 400 more, and the heat exchange efficiency is improved. The specific shape of the heat exchanger 400 may be a ring shape (circle or square circle) to completely surround the fan 300, or may have an open "C" shape.

Fig. 3 is a schematic view of the laminar flow fan, the housing flow guide surface, and the shape of the flow guide. As shown in fig. 2 and 3, the bottom wall of the casing 100 around the intake vent 110 is a flow-guiding surface 140 extending radially outward from the edge of the intake vent 110 and gradually extending downward, and the flow-guiding surface 140 is a revolution surface coaxial with the intake vent 110. When a plane curve (single curvature, the plane of the curve is not perpendicular to the rotating shaft) or a space curve (double curvature) rotates around a fixed straight line (rotating shaft), a rotating surface is formed in the space.

The diversion member 200 is disposed at the air inlet 110, and an outer circumferential surface 201 of the diversion member is a revolution surface gradually expanding outward in a radial direction from top to bottom and coaxial with the air inlet 110, and is used for guiding indoor air to flow to the air inlet 110 through a gap between the outer circumferential surface 201 of the diversion member 200 and the bottom surface of the housing 100.

Compared with the scheme of enabling the wind to directly vertically enter the casing 100 from the bottom of the casing 100 upwards, the embodiment of the invention is provided with the flow guide member 200, so that the wind flows to the wind inlet 110 from the gap between the flow guide member 200 and the bottom surface of the casing 100, the wind inlet direction is close to the horizontal direction, the air can more smoothly enter the laminar flow fan (because the annular disk 10 of the laminar flow fan 300 horizontally extends), and the energy consumption and the noise of the laminar flow fan 300 are reduced. In addition, the bottom appearance (the bottom mainly faces to users) of the ceiling type indoor unit is more attractive due to the arrangement of the flow guide piece 200, and the influence of complicated air inlet grille arranged at the bottom of the shell 100 on the appearance is avoided.

As shown in fig. 4, the flow guiding surface 140 includes, in order from the inside to the outside (i.e., in a direction away from the rotation axis), an arc transition section ED, an arc pressurizing section DC, and an arc expanding section CB that are smoothly connected. The arc-shaped extension CB connects the horizontally extending portion of the bottom surface of the housing 100, as indicated by the ray BA in fig. 4. The outer peripheral surface 201 of the flow guide member 200 includes, from top to bottom, a straight inclined section ST, an upper arc-shaped section TG and a lower arc-shaped section GF which are smoothly connected. The adjacent two sections of the smooth connecting fingers are tangent at the joint.

The outer peripheral surface 201 of the flow guide member 200 and the flow guide surface 140 define a flow guide air duct, an inlet cross section of the air duct is formed between the bottom end B of the arc expansion section CB and the bottom end F of the lower arc section GF, and an outlet cross section of the air duct is formed between the top end E of the arc transition section ED and the top end G of the lower arc section GF. The distance between the top end E of the arc transition section ED and the top end G of the lower arc section GF is smaller than the distance between the bottom end B of the arc extension section CB and the bottom end F of the lower arc section GF.

By designing the shapes of the outer circumferential surface 201 of the baffle member 200 and the flow guide surface 140 as described above, the cross-sectional area of the intake air is made to be tapered in the intake air direction. The cross-sectional area at the inlet 110 is minimized and the air flow rate is maximized, thereby forming a "venturi effect" (the venturi effect is characterized by an increase in the flow rate of the fluid when the restricted flow passes through a reduced flow cross-section, and the flow rate is inversely proportional to the flow cross-section), so that the air is accelerated into the housing 100. Please refer to fig. 4. In the arc-shaped expansion section CB section, the airflow is accelerated to flow due to the fact that the air inlet section is changed greatly. In the region of the arc-shaped supercharging section DC, the air flow deviation is stable so as to comb the air flow and reduce the eddy current loss. At the arc-shaped transition section ED, the air inlet section gradually becomes the minimum, and the accelerated flow is realized, so that the airflow enters the laminar flow fan at an accelerated speed, and the leakage is reduced. The lower arc section GF of the outer circumferential surface 201 of the flow guide member 200 corresponds to the flow guide surface 140, and the upper arc section TG and the straight inclined section ST serve to guide the air flow to move upward to enter the laminar flow fan from different positions in the height direction of the laminar flow fan.

The inventor designs the shapes and the key dimensions of the outer peripheral surface 201 and the drainage surface 140 of the flow guide element 200 in a thinning manner, so that the molded line of the flow guide element can better meet the original design purpose, namely, the flow guide element obtains better drainage, flow stabilization and vortex prevention effects. This is described in detail below with reference to fig. 4.

As shown in fig. 4, the top end E of the arc-shaped transition section ED, the bottom end F of the lower arc-shaped section GF and the radially inner end E1 of the lowermost annular disk 10 are in the same vertical plane. The bottom end B of the arc-shaped expanding section CB is located in the same vertical plane as the radially outer end B1 of the lowermost annular disk 10. The top end G of the lower arc section GF is lower than the lowermost annular disk 10, and the top end T of the upper arc section TG is higher than the lowermost annular disk 10.

Specifically, the distance between the two lowermost annular disks 10 is y, and the distances between the top end E of the arc-shaped transition section ED and the bottom surface of the lowermost annular disk 10 are m, preferably, m is smaller than or equal to y. The distance between the top end D of the arc-shaped pressurizing section DC and the bottom surface of the annular disk 10 at the lowest side is n, and preferably, n is more than or equal to 1.5y and less than or equal to 2 y. More preferably, n is 1.8 y. The distance between the top end C of the arc-shaped expanding section CB and the bottom surface of the annular disk 10 at the lowest side is t, and preferably, t is more than or equal to 2y and less than or equal to 2.3 y. More preferably, t is made 2.2 y. The distance between the bottom end B of the arc-shaped extension section CB and the bottom surface of the annular disk 10 at the lowest side is p, and preferably, p is more than or equal to 2.5y and less than or equal to 3 y. More preferably, t is made 2.8 y.

The radii of the arc transition section ED, the arc supercharging section DC and the arc expansion section CB are r1, r2 and r3 respectively. Preferably, r 1. ltoreq. r 2. ltoreq.1.2 r1, 3.5r 1. ltoreq. r 3. ltoreq.4.5 r 1. More preferably, r2 is 1.12r1 and r3 is 4r 1.

The distances between the top end G and the bottom end F of the lower arc section GF and the bottom surface of the lowermost annular disk 10 are q and h, respectively. Preferably, 4.5 y.ltoreq.q.ltoreq.5.5 y. More preferably, q is made 5 y. Preferably, 1.8y ≦ h ≦ 2.2y, and more preferably, h ≦ 2 y. The radius of the lower arc segment GF is r4, preferably r4 ═ r 3.

The distance between the top end T of the TG of the upper arc section and the bottom surface of the annular disc 10 at the lowest side is k, and preferably, k is more than or equal to 0.6y and less than or equal to 0.7 y. More preferably, k is made 0.67 y. The radius of TG of the upper arc-shaped section is r5, and preferably 3.5r1 ≦ r5 ≦ 4.5r 1. The inclination angle of the linear inclined section ST and the vertical direction can be 10-30 degrees, and a vertical section HS vertically extends upwards from the upper end of the linear inclined section ST and is used for fixing other parts of the indoor unit.

In some embodiments, the baffle 200 is rotatable about a vertically extending axis (the x-axis shown in FIG. 2). When the guiding element 200 is driven to rotate, the air on the surface layer of the outer circumference surface thereof drives the surrounding air to form a centrifugal tendency due to the viscous effect, so as to accelerate the air to enter the casing 100.

Fig. 5 is a bottom perspective view of a laminar flow fan. As shown in fig. 2 and 5, the laminar flow fan 300 may generally include a plurality of annular disks 10, a circular disk 30, and a motor 20.

The axis of the circular disk 30 is arranged above the uppermost annular disk in line with the plurality of annular disks 10, and is spaced apart from and fixedly connected to the uppermost annular disk. The center of the circular disk 30 is depressed downward to form a receiving chamber 31. A plurality of tie bars 40 may be provided to penetrate the circular disk 30 and the plurality of annular disks 10 to fix the plurality of annular disks 10 and the circular disk 30 together.

The motor 20 is located in the containing cavity 31, the top of the motor is fixed to the casing 100, and specifically, the motor can be fixed to the internal frame 150 of the casing 100, the bottom of the motor extends to form a rotating shaft 21, the rotating shaft 21 is connected to the circular disk 30 to drive the circular disk 30 to rotate, so as to drive the plurality of annular disks 10 to rotate, so that the air boundary layer near the surface of the annular disks 10 is driven by the annular disks 10 to rotate from inside to outside due to the viscous effect to form laminar air.

As shown in fig. 2, the top of the guide member 200 is fixedly connected to the lower side of the circular disk 30 to rotate synchronously with the circular disk 30. The air guide member 200 and the laminar flow fan 300 share the same motor, so that the rotation of the air guide member 200 does not need to be controlled independently, and the excessive space occupied by an additional motor is avoided.

Fig. 6 is a schematic diagram of the blowing principle of the laminar flow fan. As shown in fig. 6, the blowing principle of the laminar flow fan is mainly derived from a "tesla turbine" found in nigula tesla. Tesla turbines mainly utilize the 'laminar boundary layer effect' or 'viscous effect' of the fluid to achieve the purpose of doing work on 'turbine disks'. The laminar flow fan drives the circular discs 30 through the motor 20 to drive the plurality of annular discs 10 to rotate at a high speed, air in the intervals of the annular discs 10 contacts and moves mutually, and an air boundary layer 13 close to the surfaces of the annular discs 10 is driven by the rotating annular discs 10 to rotate and move from inside to outside under the action of viscous shearing force tau to form laminar flow wind.

FIG. 7 is a schematic cross-sectional view of a plurality of annular disks of a laminar flow fan; fig. 8 is a schematic view of air circulation of a laminar flow fan.

As shown in fig. 7 and 8, an air inlet passage 11 is formed at the center of the annular disk 10 to allow external air to enter. A plurality of air outlets 12 are formed in gaps between the plurality of annular disks 10 to allow laminar air to be blown out. The process of the laminar wind formed by the air boundary layer 13 rotating from inside to outside is centrifugal motion, so that the speed of the laminar wind leaving the air outlet 12 is higher than that of the laminar wind entering the air inlet channel 11.

In some embodiments, for any adjacent two annular disks 10, the inner circle diameter of the annular disk 10 located on the upper side is smaller than the inner circle diameter of the annular disk 10 located on the lower side. In other words, the inner circle diameter of the annular disk 10 is gradually reduced in the direction in which the air flow flows in the intake air passage 11 (or from bottom to top). Therefore, when air enters the air inlet channel 11 from bottom to top, the air flows at different positions in the radial direction respectively correspond to different annular disks 10, so that the air can flow to the annular disks more uniformly, the air is prevented from entering the annular disk at the upper side difficultly, and the effect of improving the air volume is finally achieved.

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

Claims

1. A ceiling type air conditioner indoor unit, comprising:

the bottom of the shell is provided with a circular air inlet, the side part of the shell is provided with at least one air supply outlet, the bottom wall of the shell around the air inlet is a flow guide surface which starts from the edge of the air inlet and extends outwards in the radial direction and gradually inclines downwards, and the flow guide surface is a rotary surface coaxial with the air inlet;

the laminar flow fan is arranged in the shell and comprises a plurality of annular discs which are arranged in parallel at intervals, fixedly connected with each other, vertically extended in axial line and coaxial with the air inlet; and

The drainage surface sequentially comprises an arc transition section, an arc pressurizing section and an arc expanding section which are smoothly connected from inside to outside in the radial direction, and the outer peripheral surface of the flow guide piece sequentially comprises a straight line inclined section, an upper arc section and a lower arc section which are smoothly connected from top to bottom;

the distance between the top end of the arc transition section and the top end of the lower arc section is smaller than the distance between the bottom end of the arc expansion section and the bottom end of the lower arc section.

2. The indoor unit of a ceiling type air conditioner as claimed in claim 1, wherein

The top end of the arc transition section, the bottom end of the lower arc section and the radial inner end of the annular disc at the lowest side are positioned in the same vertical plane;

the bottom end of the arc-shaped expansion section and the radial outer end of the annular disc at the lowest side are positioned in the same vertical plane;

the top end of the lower arc-shaped section is lower than the annular disc at the lowest side;

the top end of the upper arc-shaped section is higher than the annular disc at the lowest side.

3. The indoor unit of a ceiling type air conditioner as claimed in claim 2, wherein the indoor unit of a ceiling type air conditioner

Setting the distance between the two lowest annular disks as y;

the distances from the top end of the arc transition section, the top end of the arc pressurizing section, the top end and the bottom end of the arc expanding section to the bottom surface of the annular disc at the lowest side are m, n, t and p respectively;

the radii of the arc transition section, the arc pressurizing section and the arc expanding section are r1, r2 and r3 respectively; the parameters satisfy the following relations:

m≤y，1.5y≤n≤2y，2y≤t≤2.3y，2.5y≤p≤3y，r1≤r2≤1.2r1，3.5r1≤r3≤4.5r1。

4. the indoor unit of a ceiling type air conditioner as claimed in claim 3, wherein

The radius of the lower arc-shaped section is r4, and the distance between the top end and the bottom end of the lower arc-shaped section and the bottom surface of the annular disc at the lowest side is q and h respectively; the parameters satisfy the following relations:

4.5y≤q≤5.5y，1.8y≤h≤2.2y，r4＝r3。

5. the indoor unit of a ceiling type air conditioner as claimed in claim 1, wherein

The radius of the upper arc-shaped section is r5, the distance between the top end of the upper arc-shaped section and the bottom surface of the annular disc at the lowest side is k, and the parameters meet the following relations:

0.6y≤k≤0.7y，3.5r1≤r5≤4.5r1。

6. the indoor unit of a ceiling type air conditioner as claimed in claim 1, wherein

The flow guide piece can rotate around a self rotating shaft so as to drive indoor air to enter the air inlet in an accelerated manner by utilizing the viscous effect of surface layer air on the peripheral surface of the flow guide piece when the flow guide piece is driven to rotate.

7. The ceiling type air conditioning indoor unit of claim 6, wherein the laminar flow fan further comprises:

the circular disk is arranged above the annular disk at the uppermost side, is arranged at intervals and is fixedly connected with the annular disk, and the center of the circular disk is sunken downwards to form an accommodating cavity; and

and the motor is positioned in the accommodating cavity, the top of the motor is fixed on the shell, the bottom of the motor extends out of the rotating shaft, and the rotating shaft is connected with the circular disk to drive the circular disk to rotate, so that the plurality of annular disks are driven to rotate, and an air boundary layer close to the surface of the annular disk is driven by the annular disk to rotate from inside to outside due to a viscous effect to form laminar air.

8. The indoor unit of a ceiling type air conditioner as claimed in claim 7, wherein the indoor unit of a ceiling type air conditioner

The top of the flow guide piece is fixedly connected to the lower side of the circular disk so as to synchronously rotate with the circular disk under the driving of the circular disk.

9. The indoor unit of a ceiling type air conditioner as claimed in claim 1, wherein

For any adjacent two of the annular disks, the inner circle diameter of the annular disk located on the upper side is smaller than the inner circle diameter of the annular disk located on the lower side.

10. The indoor unit of a ceiling type air conditioner as claimed in claim 1, wherein

And the heat exchanger of the indoor unit of the ceiling type air conditioner is positioned between the laminar flow fan and the air supply outlet and surrounds the laminar flow fan.