CN112050297B

CN112050297B - Ultra-thin indoor unit

Info

Publication number: CN112050297B
Application number: CN202010923278.1A
Authority: CN
Inventors: 田伟; 张震
Original assignee: Qingdao Hisense Hitachi Air Conditioning System Co Ltd
Current assignee: Qingdao Hisense Hitachi Air Conditioning System Co Ltd
Priority date: 2020-09-04
Filing date: 2020-09-04
Publication date: 2022-05-17
Anticipated expiration: 2040-09-04
Also published as: CN112050297A

Abstract

The invention discloses an ultrathin indoor unit, which comprises a shell, wherein an accommodating space is formed in the shell; the centrifugal air supply device is positioned in the accommodating space and is fixedly connected to the shell; the current collector is arranged on the shell and comprises a windward surface and a leeward surface; the centrifugal air supply device comprises: impeller, the impeller includes: a wheel disc; the wheel cover is arranged corresponding to the position of the current collector, an airflow gap is formed between the wheel cover and the current collector, a plurality of spiral protruding parts are arranged on the surface of the wheel cover opposite to the lee surface of the current collector, the plurality of protruding parts are arranged along the circumferential direction of the wheel cover, and the protruding parts can push airflow flowing to the airflow gap side from the impeller to the side far away from the airflow gap side; the blade is the heliciform, is provided with a plurality ofly, connects between rim plate and wheel cap, and the direction of rotation of blade is the same with the direction of rotation of bellying. The invention solves the problems of low air supply efficiency and easy whistle generation of the existing ultrathin indoor unit caused by airflow backflow.

Description

Ultra-thin indoor unit

Technical Field

The invention relates to the technical field of household appliances, in particular to an improvement of an ultrathin indoor unit structure.

Background

At air conditioner house ornamentation trade, adopt the tuber pipe machine as market mainstream product at present, but the tuber pipe machine amount of wind is little, the noise is high, the air supply scope is little for the last problem of scaling, consequently to the above-mentioned problem, a novel ultra-thin indoor set of ceiling type has appeared on the market, adopt backward centrifugal air supply arrangement as its air supply system power source, but there is certain clearance between traditional backward centrifugal air supply arrangement and the current collector, there is some through the clearance leak back impeller entry by the gas that the impeller flows out, this type of phenomenon can cause centrifugal air supply arrangement air supply efficiency to reduce, and simultaneously, because the clearance of centrifugal air supply arrangement and current collector is less, probably produce the whistle of mouth after the air current flows in. Therefore, the novel ceiling type ultrathin indoor unit is similar to a four-direction indoor unit in the tooling industry and can only be used in places with lower noise requirements, such as markets, offices and the like where people gather.

Disclosure of Invention

In order to solve the problems that the air supply efficiency of a centrifugal air supply device is low and whistle sound is easy to generate due to airflow backflow in the ultrathin indoor unit in the prior art, the invention provides a novel ultrathin indoor unit which can reduce airflow backflow and reduce or eliminate whistle noise.

In order to achieve the purpose, the invention adopts the following technical scheme:

the invention provides an ultrathin indoor unit, which comprises a shell, wherein an accommodating space is formed in the shell;

the centrifugal air supply device is positioned in the accommodating space and is fixedly connected to the shell;

the current collector is arranged on the shell, corresponds to an air inlet of the centrifugal air supply device and is used for guiding airflow into the centrifugal air supply device, and comprises a windward surface and a leeward surface;

it is characterized in that the centrifugal air supply device comprises:

an impeller, said impeller comprising:

a wheel disc;

the wheel cover is arranged corresponding to the position of the current collector, an airflow gap is formed between the wheel cover and the current collector, a plurality of spiral protruding parts are arranged on the surface of the wheel cover opposite to the lee surface of the current collector, the plurality of protruding parts are arranged along the circumferential direction of the wheel cover, and the protruding parts can push the airflow flowing out of the impeller and flowing towards the airflow gap side to the side far away from the airflow gap;

the blades are in a spiral shape and are arranged in a plurality of positions, the blades are connected between the wheel disc and the wheel cover, and the rotating direction of the blades is the same as that of the protruding portions.

In some embodiments of the present application, the blade includes a blade trailing edge and a blade leading edge, and the protrusion includes:

a body;

a raised leading edge disposed at one end of the body;

and the raised rear edge is arranged at the other end of the body, corresponds to the position of the rear edge of the blade, and is basically flush with the rear edge of the blade along the axial direction of the impeller.

In some embodiments of the present application, the blade has a blade entrance angle and a blade exit angle, the lobe has a lobe entrance angle and a lobe exit angle, the lobe entrance angle is greater than the blade entrance angle, and the lobe exit angle is similar to the blade exit angle.

In some embodiments of the present application, the difference between the lobe inlet angle and the blade inlet angle is a, where a =10-16 degrees.

In some embodiments of the present application, the outboard face of the wheel cover and the raised trailing edge are flush.

In some embodiments of the present application, the wheel cover includes a first annular segment and a second annular segment disposed perpendicular to and in smooth transition with the first annular segment;

the bellying is including the ascending portion that flat portion and the smooth transition of flat portion are connected, flat portion sets up on first ring section and the relative face of collector lee face, the laminating of ascending portion second ring section and the relative face of collector lee face along second ring section direction of height spiral setting, the lateral surface parallel and level of the lateral surface of ascending portion and second ring section.

In some embodiments of the present application, the outer side of the raised portion is planar.

In some embodiments of the present application, the perpendicular distance from the convex trailing edge to the convex leading edge is 1/15-1 the impeller exit height.

In some embodiments of the present application, the distance from the raised leading edge to the disk is the same as the impeller eye height.

In some embodiments of the present application, the current collector and the first annular section are disposed in a position corresponding to each other, a backflow cavity communicating with the air flow gap is formed between the current collector and the second annular section, and the protrusion is located in the backflow cavity.

Compared with the prior art, the technical scheme of the invention has the following technical effects:

according to the ultrathin indoor unit, the spiral protruding parts are arranged on the wheel covers of the impellers, the spiral direction of the spiral protruding parts is the same as the rotating direction of the blades in the impellers, backflow airflow flowing out of the impellers can be received between the protruding parts, and the backflow airflow is rotated out to the side far away from the airflow gap under the action of the protruding parts in the rotating process of the impellers, so that the flow of the backflow airflow is effectively reduced, the backflow airflow is also blown outwards under the rotating action of the protruding parts, and the air blowing efficiency of the centrifugal air blowing device is improved;

and the backflow flow of the airflow is reduced, so that the airflow entering the airflow gap between the centrifugal air supply device and the current collector is reduced, and the problem of whistle noise generated in the region is effectively reduced or eliminated.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is the whole structure diagram corresponding to the ultra-thin indoor unit in the embodiment of the present invention;

FIG. 2 is a first perspective view of the ultra-thin indoor unit according to the first embodiment of the present invention;

FIG. 3 is the second three-dimensional structure diagram corresponding to the impeller of the ultra-thin indoor unit in the embodiment of the present invention;

FIG. 4 is a third schematic structural view corresponding to the impeller of the ultra-thin indoor unit in the embodiment of the present invention;

FIG. 5 is a fourth schematic structural view corresponding to the impeller of the ultra-thin indoor unit in the embodiment of the present invention;

FIG. 6 is a simulation analysis diagram of the air flow at the impeller position of the ultra-thin indoor unit in the prior art;

fig. 7 is a simulation analysis diagram of the air flow at the impeller position of the ultra-thin indoor unit in the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

In the description of the present invention, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected unless otherwise explicitly stated or limited. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

The first embodiment is as follows:

the invention provides an embodiment of an ultrathin indoor unit, which comprises a machine shell 100, wherein an accommodating space is formed in the machine shell 100; in some embodiments, the housing 100 is correspondingly configured to include a front housing and a rear housing connected in sequence.

Centrifugal air supply arrangement 200 is located in accommodation space and fixed connection on casing 100, centrifugal air supply arrangement 200 is when setting up, and optional backward centrifugal fan, for realizing ultra-thin setting, backward centrifugal fan in this embodiment does not set up the spiral case, and it can on the backshell of casing 100 for the snap-on.

And a collector 300 disposed on the casing 100, corresponding to an air inlet of the centrifugal air supply device 200, for guiding air flow into the centrifugal air supply device 200, wherein the collector 300 includes a windward surface and a leeward surface.

The collector 300 is mainly used for guiding the airflow, and in some embodiments, the collector 300 is directly integrated with the front housing, and has an annular shape, including a windward side directly contacting the airflow and a leeward side disposed on the back of the windward side. When the diversion is carried out, the airflow enters through the windward side.

The centrifugal blower 200 includes:

impeller and be used for driving impeller pivoted driving motor, specifically, the impeller includes:

a wheel disc 210;

the wheel cover 220, the wheel cover 220 and the wheel disc 210 are oppositely arranged, the plurality of blades 230 are spirally arranged and connected between the wheel disc 210 and the wheel cover 220, a blade 230 flow passage is formed between the adjacent blades 230, and the blade 230 flow passage comprises an airflow inlet and an airflow outlet.

The wheel disc 210 is provided with an installation part for installing a driving motor, and a transmission shaft of the driving motor is fixedly connected with the installation part.

When the current collector 300 is arranged, the position of the current collector corresponds to the position of the air inlet of the centrifugal air supply device 200, and when the centrifugal air supply device works, the driving motor of the centrifugal air supply device 200 is started to drive the impeller to rotate, external air flow is guided in through the guiding function of the current collector 300 and then enters along the axial inlet of the impeller, and the air flow enters the flow channel of the blade 230 and flows out from the air flow outlet of the flow channel of the blade 230.

In order to realize the effects of cooling and heating, the ultrathin indoor unit in the embodiment further comprises an indoor heat exchanger. The indoor heat exchanger corresponds to the compressor, the outdoor heat exchanger and the expansion valve to form a refrigeration cycle system.

The compressor compresses a refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the outdoor heat exchanger. The outdoor heat exchanger condenses the compressed refrigerant into a liquid phase, and heat is released to the ambient environment through the condensation process.

The expansion valve expands the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant. The indoor heat exchanger evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The indoor heat exchanger may achieve a cooling effect by heat-exchanging with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner can adjust the temperature of the indoor space throughout the cycle.

The air current can enter into the impeller after being inhaled by centrifugal air supply arrangement 200, then outwards flow out through the blade runner on the impeller, in some embodiments, the air outlet setting of ultra-thin indoor set is in the top of casing 100 and the both sides position department of casing 100, it is corresponding, for realizing better heat transfer effect, when setting up, set up indoor heat exchanger to the U type heat exchanger around centrifugal air supply arrangement 200 circumference setting, it corresponds with the roof and the both sides wall position of casing 100 respectively, the air current can flow through or indoor heat exchanger after blowing out from centrifugal air supply arrangement 200, carry out the heat transfer with indoor heat exchanger, then outwards discharge through the air outlet at casing 100 top and both sides through the air current.

When the whole ultrathin indoor unit is assembled in place, the wheel cover 220 is arranged corresponding to the position of the current collector 300, an air flow gap 400 is formed between the wheel cover 220 and the current collector 300, and the assembled current collector 300 is close to the wheel cover 220.

During the continuous rotation of the impeller, a part of the airflow flowing out of the blade flow passage may generate backflow, and then enters the air inlet of the impeller through the airflow gap 400, so as to cause the backflow of the airflow.

Further, since the airflow gap 400 between the shroud 220 and the collector 300 is relatively small, noise such as a whistle may be generated when a large amount of airflow flows backward.

In order to avoid or reduce the backflow of the air flow as much as possible, in this embodiment, a plurality of spiral protrusions 221 are correspondingly disposed on the wheel cover 220, specifically, the protrusions 221 are disposed on the surface of the wheel cover 220 opposite to the leeward surface of the collector 300, the plurality of protrusions 221 are disposed along the circumferential direction of the wheel cover 220, and the rotation direction of the blades 230 is the same as the rotation direction of the protrusions 221. The protrusion 221 can push out the airflow flowing out of the impeller toward the airflow gap 400 to a side away from the airflow gap 400.

In some embodiments of the present application, the number of the protrusions 221 is similar to the number of the blades 230.

The protrusion 221 is spirally configured to have a similar structural shape to the blade 230, and when the impeller rotates, the protrusion 221 provided on the shroud 220 is driven to rotate synchronously, and the protrusion 221 acts similar to the blade 230 to throw the airflow outward.

In this embodiment, the rotation direction of the protruding portion 221 and the rotation direction of the blade 230 are set to be the same direction, so that the protruding portion 221 can receive most or all of the backflow airflow which is rotated out from the blade 230, the flow rate of the received backflow airflow is increased, and the protruding portion 221 can push out the backflow airflow after performing rotation work, so that the flow rate of the backflow airflow is reduced, the pushed airflow can be blown out to the external space through the air outlet of the casing 100 as other airflow which flows out from the impeller, and is used for cooling or heating, and the air supply efficiency of the centrifugal air supply device 200 is improved;

meanwhile, the flow of the backflow airflow is reduced, so that the airflow entering the airflow gap 400 is reduced, and the whistle noise at the airflow gap 400 is avoided.

Meanwhile, referring to fig. 6 and 7 in the simulation analysis diagram, it is also apparent that a large amount of backflow airflow exists in the indoor unit without the projection structure in fig. 6, and when the projection 221 is provided on the wheel cover 220, as shown in fig. 7, the flow rate of the backflow airflow is greatly reduced.

In some embodiments of the present application, the blade 230 comprises a blade trailing edge and a blade leading edge, and the protrusion 221 comprises a body 2211;

a raised front edge 2212 is disposed at one end of the body 2211.

And a raised rear edge 2213 which is arranged at the other end of the body 2211 and corresponds to the position of the rear edge of the blade, and the raised rear edge 2213 is basically flush with the rear edge of the blade along the axial direction of the impeller. Therefore, a large amount of airflow which flows back from the airflow outlet on the impeller can be effectively received, and further, the flowing back airflow can mostly pass through the convex part 221 and be pushed out after being worked by the convex part 221.

In some embodiments of the present application, the blade 230 has a blade entrance angle and a blade exit angle, the lobe 221 has a lobe entrance angle and a lobe exit angle, the lobe entrance angle is greater than the blade entrance angle, and the lobe exit angle is similar to the blade exit angle.

The cross-sectional contour line of the protruding portion 221 is as shown in fig. 4-5, and it includes a blade leading edge line, a blade trailing edge line, and two arcs connected between the blade leading edge line and the blade trailing edge line, an inscribed circle is made between the two arcs along the length direction of the blade 230, the center of the inscribed circle is connected to form the middle arc line of the protruding portion 221, correspondingly, the intersection point of the middle arc line and the blade leading edge line is along the included angle between the tangent line of the middle arc direction and the tangent line of the intersection point on the circumference formed by using the center of the impeller as the center of the circle as the protruding portion inlet angle, which is B in this embodiment.

Correspondingly, the outlet angle of the boss 221 is an included angle between a tangent line of an intersection point of the middle arc and the blade trailing edge line along the middle arc direction and a tangent line of the intersection point on a circumference formed by taking the center of the impeller as a circle center, and is set as C in the embodiment.

When the ultrathin indoor unit in this embodiment is installed, the spiral direction of the protruding portion 221 is the same as the spiral direction of the vane 230 of the impeller, but the spiral amplitudes are different, and the protruding front edge 2212 of the protruding portion 221 has a deflection distance with respect to the front edge of the vane 230, that is, the inlet angle of the protruding portion 221 is larger than the inlet angle of the vane 230 during installation, so that more backflow airflow flowing out from the impeller can be accommodated between the two protruding portions 221, and the protruding portions 221 can apply work to more backflow airflow and push the backflow airflow outward, thereby reducing the flow rate of the backflow airflow and improving the air supply efficiency of the centrifugal air supply device 200.

In some embodiments of the present application, the difference between the inlet angle of the protrusion 221 and the inlet angle of the blade 230 is a, where a =10-16 degrees, and in some preferred embodiments of the present application, a =14 degrees.

In some embodiments of the present application, the wheel disc 210 includes a first annular section 222 and a second annular section 223 disposed perpendicular to the first annular section 222 and smoothly transitionally connected to the first annular section 222, and in some embodiments, the first annular section 222 corresponds to a first annular cylinder, and the second annular section 223 corresponds to an outwardly folded trumpet-like cylinder connected to the first annular cylinder.

In order to achieve a rapid introduction of the gas flow introduced by the collector 300 into the impeller, the first annular section 222 and the collector 300 are positioned such that they correspond to each other, and the inner diameter of the first annular section 222 is configured to match the minimum inner diameter of the collector 300, so that the gas flow passes through the collector 300, is directly introduced into the first annular section 222 and then enters the interior of the impeller, and does not pass through the second annular section 223 during the flow.

Correspondingly, in some embodiments, the protrusion 221 is configured to: the flat 2214 is arranged on the surface of the first annular section 222 opposite to the leeward surface of the current collector 300, and the ascending portion 2215 is arranged on the surface of the second annular section 223 opposite to the leeward surface of the current collector 300 and is upwards spiral along the height direction of the second annular section 223.

Because the backflow airflow generated by the rotation of the impeller mainly flows back to the airflow gap 400 along the surface of the wheel cover 220 opposite to the leeward surface of the current collector 300, in this embodiment, the ascending portion 2215 is arranged on the second annular section 223 and is spirally and upwardly arranged in close contact with the second annular section 223, so that the backflow airflow can be directly contacted with the backflow airflow, the backflow airflow can be directly pushed out by applying work when the impeller rotates, the flow rate of the pushed airflow is increased, and the backflow flow rate of the airflow is reduced.

In some embodiments of the present application, the outboard face 224 of the wheel cover 220 is flush with the raised rear edge 2213. Specifically, the outer side surface 224 of the wheel cover 220 is flush with the outer side surface of the second annular section 223, and since the air flow at the backflow position enters the air flow gap 400 along the outer side surface 224 of the wheel cover 220, the protruding portion 221 and the outer side surface of the wheel cover 220 are arranged in a flush state, so that the contact area of the air flow is increased.

The flat portion 2214 and the raised portion 2215 may be provided with a tangent connection or a non-tangent connection, and are not particularly limited herein.

In some embodiments of the present application, the outer side surface of the raised portion 2215 is a plane.

In some embodiments of the present application, the perpendicular distance from the convex trailing edge 2213 to the convex leading edge 2212 is 1/15-1, the impeller exit height. The vertical height of the convex part 221 is 1-1/15, preferably 1/10, of the outlet height of the impeller, and on the premise of not influencing the use of the impeller, the work area can be increased by selecting the higher convex part 221 so as to push more airflow outwards.

In some embodiments of the present application, the distance from the raised leading edge 2212 to the disk 210 is the same as the impeller inlet height.

The inlet height of the impeller is: the distance from the leading edge of the corresponding blade 230 at the location of the disk 210 to the leading edge of the blade 230 at the location of the shroud 220 is the wheel inlet height.

The outlet height of the impeller is: the distance from the trailing edge of the corresponding blade 230 at the location of the disk 210 to the trailing edge of the blade 230 at the location of the shroud 220 is the impeller exit height.

In some embodiments of the present application, the collector 300 and the first annular section 222 are disposed in a corresponding position, a backflow cavity 500 communicating with the air flow gap 400 is formed in a space between the leeward side of the collector 300 and the second annular section 223, and the protrusion 221 is located in the backflow cavity 500.

When the air current enters, the air current enters the first annular section 222 along the windward side of the current collector 300 and then enters the interior of the impeller, the air current does not flow through the second annular section 223, the air current enters the flow channels of the blades 230 after the impeller works and flows out through the flow channel outlets of the flow channels of the blades 230, most of the flowing-out air current directly passes through the air outlet on the casing 100 and is vertical to the outside, and a small part of the air current enters the interior of the backflow cavity 500 along the surface of the second annular section 223 of the wheel cover 220.

Set up boss 221 in backward flow chamber 500 in this embodiment, when the impeller rotated, drive blade 230 and set up the synchronous rotation of boss 221 on wheel cover 220, rotate through boss 221, will enter into the air current in backward flow chamber 500 and get rid of the department to the outside spiral to avoid the air current to enter into backward flow chamber 500 and then flow back inside the impeller through air current clearance 400.

In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An ultra-thin indoor unit comprises a casing, wherein an accommodating space is formed inside the casing;

the current collector is arranged on the shell and used for guiding airflow into the centrifugal air supply device, and comprises a windward surface and a leeward surface;

it is characterized in that the centrifugal air supply device comprises:

an impeller, said impeller comprising:

a wheel disc;

the blade is the heliciform, is provided with a plurality ofly, connects the rim plate with between the wheel cap, the soon of blade with the revolve to the same of bellying, the blade includes blade leading edge and blade trailing edge, the bellying is including:

a body portion;

a raised leading edge disposed at one end of the body portion;

and the raised rear edge is arranged at the other end of the body part, corresponds to the position of the blade rear edge and is basically flush with the blade rear edge along the axial direction of the impeller.

2. The ultra-thin indoor unit of claim 1, wherein the vane has a vane inlet angle and a vane outlet angle, the lobe has a lobe inlet angle and a lobe outlet angle, the lobe inlet angle is greater than the vane inlet angle, and the lobe outlet angle is similar to the vane outlet angle.

3. The ultra-thin indoor unit of claim 2, wherein the difference between the lobe entrance angle and the vane entrance angle is a, where a =10-16 degrees.

4. The ultra-thin indoor unit of claim 1, wherein the outer side of the wheel cover is flush with the rear edge of the protrusion.

5. The ultra-thin indoor unit of claim 4, wherein the wheel cover comprises a first ring section and a second ring section perpendicular to the first ring section and smoothly transitionally connected to the first ring section;

6. The ultra-thin indoor unit of claim 5, wherein an outer side surface of the rising part is a flat surface.

7. The ultra-thin indoor unit of claim 1, wherein a vertical distance from the rear edge of the projection to the front edge of the projection is 1/15-1 of the impeller outlet height.

8. The ultra-thin indoor unit of claim 1, wherein the distance from the convex front edge to the wheel disc is the same as the impeller inlet height.

9. The ultra-thin indoor unit of claim 5, wherein the current collector and the first annular section are disposed at positions corresponding to each other, a return chamber communicating with the air flow gap is formed between the current collector and the second annular section, and the protrusion is disposed in the return chamber.