CN215062430U

CN215062430U - Indoor machine of air conditioner

Info

Publication number: CN215062430U
Application number: CN202121466263.3U
Authority: CN
Inventors: 谢宝臣; 李小宁
Original assignee: Hisense Shandong Air Conditioning Co Ltd
Current assignee: Hisense Air Conditioning Co Ltd
Priority date: 2021-06-28
Filing date: 2021-06-28
Publication date: 2021-12-07
Anticipated expiration: 2031-06-28

Abstract

The utility model discloses an air conditioner, air conditioner includes: the air conditioner comprises a machine shell, a fan and a control device, wherein the machine shell is provided with a front air outlet, a side air outlet and a lower air outlet; the indoor heat exchanger is arranged in the shell; the air duct piece is arranged in the shell and positioned in front of the indoor heat exchanger, and is communicated with the front air outlet, the side air outlet and the lower air outlet; the axial flow fan, the forward centrifugal fan and the backward centrifugal fan are all arranged on the air duct piece and are sequentially arranged from top to bottom; the axial direction of the axial flow fan is opposite to that of the front air outlet, the side air outlets are arranged on two radial sides of the forward centrifugal fan and the backward centrifugal fan, and the lower air outlet is arranged below the backward centrifugal fan and is in the same direction as the front air outlet. According to the utility model discloses air conditioner's air-out area is great, and has advantages such as the distance of supplying air is far away, the wind sense is soft to avoid hot-blast rising concurrently.

Description

Indoor machine of air conditioner

Technical Field

The utility model belongs to the technical field of air conditioning equipment and specifically relates to an air conditioner indoor unit is related to.

Background

Air conditioner indoor among the correlation technique, the air supply difference is less, air conditioner indoor often can only be to single position and angle air supply, though can be through the swing adjustment wind direction of baffle, however this kind of mode control range is limited, be difficult to realize large-scale air supply requirement, and then lead to hot-blast rising, influence air conditioner lower part air-out experience, and even adjust the air current direction, the loss of wind speed and wind pressure is also great, if centrifugal fan directly blows to the user, then the sensation of wind that can make the user experience is not soft, therefore air conditioner indoor can't compromise remote air supply, the soft hot-blast problem of rising of sensation of wind, user experience remains to be improved.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, an object of the present invention is to provide an air conditioner indoor unit, which has a large air outlet area and has the advantages of long air supply distance, soft wind feeling, and prevention of rising of hot air.

In order to achieve the above object, an embodiment of the present invention provides an air conditioner indoor unit, including: the air conditioner comprises a machine shell, a fan and a control device, wherein the machine shell is provided with a front air outlet, a side air outlet and a lower air outlet; the indoor heat exchanger is arranged in the shell; the air duct piece is arranged in the shell and positioned in front of the indoor heat exchanger, and is communicated with the front air outlet, the side air outlet and the lower air outlet; the fan comprises an axial flow fan, a forward centrifugal fan and a backward centrifugal fan, wherein the axial flow fan, the forward centrifugal fan and the backward centrifugal fan are all arranged on an air duct piece and are sequentially arranged from top to bottom; the axial position of the axial flow fan corresponds to that of the front air outlet, the side air outlets are arranged on two radial sides of the forward centrifugal fan and the backward centrifugal fan, and the lower air outlet is arranged below the backward centrifugal fan and has the same orientation as the front air outlet.

According to the utility model discloses air conditioner's air-out area is great, and has advantages such as the distance of supplying air is far away, the wind sense is soft to avoid hot-blast rising concurrently.

According to some embodiments of the present invention, the air duct member comprises: the upper air duct piece is provided with an opening, the opening corresponds to the position of the positive air outlet, and the axial flow fan is installed on the upper air duct piece; the middle air duct piece is connected below the upper air duct piece and provided with a first side air outlet, the first side air outlet is positioned at two radial sides of the forward centrifugal fan and communicated with the side air outlets, and the forward centrifugal fan is arranged on the middle air duct piece; the lower air duct piece is connected below the middle air duct piece, the lower air duct piece is provided with a second side air outlet and a lower air duct air outlet, the second side air outlet is located on two radial sides of the backward centrifugal fan and communicated with the side air outlet, the lower air duct air outlet is located below the backward centrifugal fan and communicated with the lower air outlet, and the backward centrifugal fan is installed on the lower air duct piece.

Further, the upper air duct piece, the middle air duct piece and the lower air duct piece are integrally formed.

According to the utility model discloses a some embodiments, axial fan includes motor and fan, it is in to go up wind channel spare uncovered air guide grid that is equipped with, air guide grid's central point puts and is equipped with the axial fan motor mounting groove, axial fan's motor install in the axial fan motor mounting groove.

Furthermore, the air guide grid comprises a plurality of grid pieces, the grid pieces radially and spirally extend from the center of the air guide grid to the edge of the air guide grid, the fan of the axial flow fan radially and spirally extends from the center of the air guide grid to the edge of the air guide grid, and the air guide grid and the fan of the axial flow fan are opposite in spiral direction.

According to some embodiments of the present invention, the middle air duct member is provided with a first air guiding portion and a second air guiding portion, the first air guiding portion and the second air guiding portion are located at two radial sides of the forward centrifugal fan, the first air guiding portion is located above the second air guiding portion, and the first air guiding portion and the second air guiding portion guide the airflow of the forward centrifugal fan to the side air outlet along the circumferential direction of the forward centrifugal fan; the lower air duct piece is provided with a third air guide portion, a fourth air guide portion and a fifth air guide portion, the fourth air guide portion and the fifth air guide portion are located on two radial sides of the backward centrifugal fan, the third air guide portion is located above the fourth air guide portion and the fifth air guide portion, the third air guide portion and the fourth air guide portion guide airflow of the backward centrifugal fan to the side air outlet along the circumferential direction of the backward centrifugal fan, and the fifth air guide portion guide airflow of the backward centrifugal fan to the lower air outlet along the circumferential direction of the backward centrifugal fan.

According to some embodiments of the present invention, a first fixing plate is disposed on a side of the air duct member facing away from the indoor heat exchanger, the first fixing plate corresponds to the forward centrifugal fan, and the forward centrifugal fan is mounted on the first fixing plate; and a second fixing plate is arranged on one side of the air duct piece, which faces away from the indoor heat exchanger, the second fixing plate corresponds to the backward centrifugal fan, and the backward centrifugal fan is arranged on the second fixing plate.

Further, each of the forward centrifugal fan and the backward centrifugal fan includes a motor and a fan; a first mounting groove is formed in one side, back to the indoor heat exchanger, of the first fixing plate, a motor of the forward centrifugal fan is mounted in the first mounting groove, and the motor and the fan of the forward centrifugal fan are located on two sides of the first fixing plate in the thickness direction respectively; one side of the second fixing plate, which faces away from the indoor heat exchanger, is provided with a second mounting groove, the motor of the forward centrifugal fan is mounted in the second mounting groove, and the motor and the fan of the backward centrifugal fan are respectively positioned on two sides of the second fixing plate in the thickness direction.

According to some embodiments of the utility model, axial fan forward centrifugal fan with backward centrifugal fan's axis of rotation is located same vertical plane, axial fan forward centrifugal fan backward centrifugal fan with indoor heat exchanger is the same in the ascending distance in front and back side.

According to some embodiments of the utility model, the air conditioner indoor unit still includes: the electric heating element, the orientation of indoor heat exchanger axial fan, preceding centrifugal fan and the surface construction of backward centrifugal fan have sunken, sunken in the width direction's of indoor heat exchanger center department, electric heating element is located the depressed place.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural diagram of an air conditioner indoor unit according to an embodiment of the present invention;

fig. 2 is a schematic view of an internal structure of an indoor unit of an air conditioner according to an embodiment of the present invention;

fig. 3 is a front view of an internal structure of an indoor unit of an air conditioner according to an embodiment of the present invention;

fig. 4 is an exploded view of an indoor unit of an air conditioner according to an embodiment of the present invention;

fig. 5 is a schematic view of an air duct of an indoor unit of an air conditioner according to an embodiment of the present invention;

fig. 6 is a partial exploded view of an indoor unit of an air conditioner according to an embodiment of the present invention;

fig. 7 is a sectional view of a forward centrifugal fan and a backward centrifugal fan of an indoor unit of an air conditioner according to an embodiment of the present invention.

Reference numerals:

an indoor machine 1 of an air conditioner,

A machine shell 100, a front air outlet 101, a side air outlet 102, a lower air outlet 103,

An indoor heat exchanger 200, an air duct 300, an upper air duct 310, an intermediate air duct 320, a lower air duct 330,

An opening 311, an air guide grid 312, an axial flow motor mounting groove 313, a grid 314, a first side air outlet 321,

A first air guiding part 322, a second air guiding part 323, a second side air outlet 331, a lower air duct air outlet 332,

A third air guiding part 333, a fourth air guiding part 334, a fifth air guiding part 335, a first fixing plate 340,

A second fixing plate 350, a first installation groove 341, a second installation groove 351,

Axial fan 400, forward centrifugal fan 500, backward centrifugal fan 600, electric heater 700.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

In the description of the present invention, "the first feature" and "the second feature" may include one or more of the features.

In the description of the present invention, "a plurality" means two or more, and "a plurality" means one or more.

In the description of the present invention, the first feature "on" or "under" the second feature may include the first and second features being in direct contact, and may also include the first and second features being in contact with each other not directly but through another feature therebetween.

In the description of the invention, the first feature being "on", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature.

An air conditioner indoor unit 1 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

As shown in fig. 1 to 7, an air conditioner indoor unit 1 according to an embodiment of the present invention includes a casing 100, an indoor heat exchanger 200, an air duct 300, an axial flow fan 400, a forward centrifugal fan 500, and a backward centrifugal fan 600.

Specifically, the casing 100 is provided with a front outlet 101, a side outlet 102, and a lower outlet 103. The indoor heat exchanger 200 is provided in the cabinet 100. The air duct 300 is disposed in the casing 100 and located in front of the indoor heat exchanger 200, and the air duct 300 is communicated with the front air outlet 101, the side air outlet 102, and the lower air outlet 103. The axial flow fan 400, the forward centrifugal fan 500 and the backward centrifugal fan 600 are all installed in the air duct member 300 and sequentially arranged from top to bottom.

The axial position of the front air outlet 101 corresponds to that of the axial flow fan 400, the side air outlets 102 are arranged on two radial sides of the forward centrifugal fan 500 and the backward centrifugal fan 600, and the lower air outlet 103 is arranged below the backward centrifugal fan 600 and has the same orientation as the front air outlet 101. For example, the front outlet 101 and the lower outlet 103 are provided on the front surface of the cabinet 100, and the side outlets 102 are provided on the left and right sides of the cabinet 100.

It should be noted that the air conditioner indoor unit 1 according to the embodiment of the present invention is a floor air conditioner indoor unit. As shown in FIG. 7, the area of the blades of forward centrifugal fan 500 is smaller than the area of the blades of backward centrifugal fan 600, and the blades of forward centrifugal fan 500Included angle beta between the outer end of the blade and the outer circumference of the forward centrifugal fan 500₁Greater than 90 degrees, and the included angle beta between the outer end of the blade of the backward centrifugal fan 600 and the peripheral circle of the forward centrifugal fan 500₂Less than 90 degrees, the wind pressure generated by the forward centrifugal fan 500 is larger, and the wind blowing device is suitable for blowing in a more concentrated area. The backward centrifugal fan 600 has a small wind pressure and a high air supply efficiency, and is suitable for supplying air in a large area.

According to the utility model discloses air conditioner 1, through setting up axial fan 400, preceding centrifugal fan 500 and backward centrifugal fan 600, axial fan 400 air supply is adopted on air conditioner 1's upper portion, and axial fan 400 is at the air-out of positive air outlet 101 axial, and the air current that axial fan 400 produced makes the user can experience soft wind sense. The middle part of the indoor unit 1 of the air conditioner adopts the forward centrifugal fan 500 to supply air, the air outlet of the forward centrifugal fan 500 is concentrated, and then the air outlet 102 at the radial two sides of the forward centrifugal fan 500 is concentrated to supply air, so that the remote surrounding air supply experience is realized. The lower part of the indoor unit 1 of the air conditioner adopts the backward centrifugal fan 600 to supply air, the air flow generated by the backward centrifugal fan 600 is large, and the backward centrifugal fan 600 can surround the air supply from the side air outlets 102 at the two radial sides of the backward centrifugal fan 600 and can also output air at the lower air outlet 103.

Therefore, air can be exhausted from the upper position, the middle position and the lower position of the indoor unit 1 of the air conditioner, and a larger air outlet area is ensured. And, when air conditioner indoor unit 1 produced hot-blast, can be at lower air outlet 103 air-out to make hot-blast blowing down, solved the problem that hot-blast rises, make the below also can obtain good hot-blast experience.

Therefore, according to the utility model discloses air conditioner 1's air-out area is great, and has advantages such as remote air supply, the soft and hot-blast downdraft of wind sense concurrently.

In some embodiments of the present invention, as shown in fig. 2, the air duct member 300 includes an upper air duct member 310, an intermediate air duct member 320, and a lower air duct member 330.

The upper air duct 310 is provided with an opening 311, the opening 311 corresponds to the position of the front air outlet 101, and the axial flow fan 400 is installed on the upper air duct 310.

Well wind channel 320 connects in the below of last wind channel 310, and well wind channel 320 is equipped with first side air outlet 321, and first side air outlet 321 is located preceding radial both sides and with the side air outlet 102 intercommunication of centrifugal fan 500, preceding centrifugal fan 500 installation in well wind channel 320.

Lower wind channel piece 330 is connected in the below of well wind channel piece 320, and lower wind channel piece 330 is equipped with second side air outlet 331 and lower wind channel air outlet 332, and second side air outlet 331 is located the radial both sides of back centrifugal fan 600 and communicates with side air outlet 102, and lower wind channel air outlet 332 is located the below of back centrifugal fan 600 and communicates with lower air outlet 103, and back centrifugal fan 600 installs in lower wind channel piece 330.

For example, the upper duct member 310, the middle duct member 320, and the lower duct member 330 are sequentially stacked from top to bottom, the upper duct member 310, the middle duct member 320, and the lower duct member 330 are adapted to the inner contour of the casing 100, and the opening 311 of the upper duct member 310 faces the positive air outlet 101, so that the wind generated by the axial flow fan 400 can be directly delivered into the room through the opening 311 and the positive air outlet 101. The middle air duct piece 320 is provided with the first side air outlet 321, and the first side air outlet 321 is communicated with the side air outlet 102 at two radial sides of the forward centrifugal fan 500, so that the air flow generated by the forward centrifugal fan 500 can be transmitted to the first side air outlet 321 and the side air outlet 102 through an air guide path defined by the middle air duct piece 320, and the air flow in the middle air duct piece 320 is smoother. The lower air duct member 330 is provided with a second side air outlet 331 and a lower air duct air outlet 332, the second side air outlet 331 is communicated with the side air outlet 102 at two radial sides of the backward centrifugal fan 600, and the lower air duct air outlet 332 is communicated with the lower air outlet 103 below the backward centrifugal fan 600, so that air flow generated by the backward centrifugal fan 600 can be transmitted to the second side air outlet 331 and the side air outlet 102 as well as the lower air duct air outlet 332 and the lower air outlet 103 through an air guide path defined by the lower air duct member 330. Furthermore, the upper duct member 310, the middle duct member 320, and the lower duct member 330 can guide wind independently, and the wind guiding is smooth.

Further, the upper duct member 310, the middle duct member 320, and the lower duct member 330 are integrally molded. Further, the number of parts is reduced, the steps of machining and assembling are reduced, and the assembling positions of the upper duct member 310, the middle duct member 320, and the lower duct member 330 with the axial flow fan 400, the forward centrifugal fan 500, and the backward centrifugal fan 600 in the casing 100 are more accurately made.

In some embodiments of the present invention, as shown in fig. 6, the axial flow fan 400 includes a motor and a fan, the upper duct member 310 is provided with an air guiding grid 312 at an opening 311, the air guiding grid 312 can be located in front of the axial flow fan 400, a central position of the air guiding grid 312 is provided with an axial flow motor mounting groove 313, and the motor of the axial flow fan 400 is mounted in the axial flow motor mounting groove 313.

The air guide grille 312 breaks up the airflow generated by the axial flow fan 400 and conveys the airflow to the indoor from the front air outlet 101, so that the air supply above the indoor unit 1 of the air conditioner is soft, and the discomfort caused by direct blowing is reduced. Further, the axial flow fan 400 and the air guide grill 312 can be stably assembled to each other through the axial flow motor mounting groove 313 at the center of the air guide grill 312.

Further, as shown in fig. 3, the air guiding grille 312 includes a plurality of grills 314, the plurality of grills 314 radially and spirally extend from the center of the air guiding grille 312 to the edge of the air guiding grille 312, the fan of the axial flow fan 400 radially and spirally extends from the center to the edge, and the spiral directions of the air guiding grille 312 and the fan of the axial flow fan 400 are opposite.

For example, when viewed from the front of the air conditioner indoor unit 1, the spiral direction of the fan of the axial flow fan 400 extends in a clockwise spiral manner, and the air guide grille 312 extends in a counterclockwise spiral manner. So, axial fan 400's fan can be disturbed the flow by bars piece 314 to uncovered 311 wind-guiding, and bars piece 314 can further promote the air-out effect of uncovered 311 and positive air outlet 101, and then form soft air-out on air conditioner 1 upper portion and experience.

In some embodiments of the present invention, as shown in fig. 5, the middle air duct 320 is provided with a first air guiding portion 322 and a second air guiding portion 323, the first air guiding portion 322 and the second air guiding portion 323 are located at two radial sides of the forward centrifugal fan 500, the first air guiding portion 322 is located above the second air guiding portion 323, and the first air guiding portion 322 and the second air guiding portion 323 guide the airflow of the forward centrifugal fan 500 to the side air outlet 102 along the circumferential direction of the forward centrifugal fan 500.

The lower air duct member 330 is provided with a third air guiding portion 333, a fourth air guiding portion 334 and a fifth air guiding portion 335, the fourth air guiding portion 334 and the fifth air guiding portion 335 are located at two sides of the backward centrifugal fan 600 in the radial direction, the third air guiding portion 333 is located above the fourth air guiding portion 334 and the fifth air guiding portion 335, the third air guiding portion 333 and the fourth air guiding portion 334 guide the airflow of the backward centrifugal fan 600 to the side air outlet 102 along the circumferential direction of the backward centrifugal fan 600, and the fifth air guiding portion 335 guides the airflow of the backward centrifugal fan 600 to the lower air outlet 103 along the circumferential direction of the backward centrifugal fan 600.

For example, the sides of the first and second

wind guide portions

322 and 323 facing the forward centrifugal fan 500 are each configured in an arc shape. The middle air duct 320 makes the air flow generated by the forward centrifugal fan 500 flow smoothly in the middle air duct 320 by constructing the first air guiding portion 322 and the second air guiding portion 323. Moreover, the first air guiding portion 322 and the second air guiding portion 323 are respectively located at two radial sides of the forward centrifugal fan 500, so that the air outlet direction corresponds to the positions of the two radial sides of the forward centrifugal fan 500, the air flow in the middle air duct piece 320 respectively flows to two sides along the first air guiding portion 322 and the second air guiding portion 323, and the air flow is guided to the side air outlet 102 through the first side air outlet 321, so that a stronger wind sensation is achieved, and the surrounding air supply experience is realized.

The third air guiding part 333, the fourth air guiding part 334, and the fifth air guiding part 335 may be curved on the side facing the backward centrifugal fan 600. The lower air duct 330 makes the airflow generated by the backward centrifugal fan 600 flow smoothly in the lower air duct 330 by constructing the third air guiding portion 333, the fourth air guiding portion 334 and the fifth air guiding portion 335, and the third air guiding portion 333 is located above the fourth air guiding portion 334 and the fifth air guiding portion 335, and guides the airflow generated by the backward centrifugal fan 600 to the side air outlet 102 through the second side air outlet 331. The fourth air guiding part 334 guides the air flow generated toward the centrifugal fan 600 to the other side air outlet 102 through the second side air outlet 331 at the other side below the third air guiding part 333. The fifth air guiding part 335 guides the air flow generated to the centrifugal fan 600 to the lower air outlet 103 through the lower air duct air outlet 332, so that air guiding functions are provided on the radial two sides and the lower side of the backward centrifugal fan 600, and large-range air outlet experience is achieved.

In some embodiments of the present invention, as shown in fig. 6, one side of the air duct member 300 facing away from the indoor heat exchanger 200 has a first fixing plate 340, the first fixing plate 340 corresponds to the position of the forward centrifugal fan 500, and the forward centrifugal fan 500 is installed on the first fixing plate 340.

One side of the air duct member 300 facing away from the indoor heat exchanger 200 is provided with a second fixing plate 350, the second fixing plate 350 corresponds to the rear centrifugal fan 600, and the rear centrifugal fan 600 is mounted on the second fixing plate 350.

Since the first fixing plate 340 and the second fixing plate 350 are respectively located at a side of the air duct member 300 facing away from the indoor heat exchanger 200, the first fixing plate 340 and the second fixing plate 350 do not shield the indoor heat exchanger 200, thereby preventing heat exchange of the indoor heat exchanger 200 from being affected. And the first fixing plate 340 provides a mounting carrier for the forward centrifugal fan 500 to keep the positions of the forward centrifugal fan 500 and the middle air duct member 320 fixed, and the second fixing plate 350 provides a mounting carrier for the backward centrifugal fan 600 to keep the positions of the backward centrifugal fan 600 and the lower air duct member 330 fixed. The firm installation of forward centrifugal fan 500 and backward centrifugal fan 600 is ensured.

Further, as shown in fig. 6, each of forward centrifugal fan 500 and backward centrifugal fan 600 includes a motor and a fan.

One side of the first fixing plate 340 facing away from the indoor heat exchanger 200 is provided with a first mounting groove 341, a motor for the centrifugal fan 500 is mounted in the first mounting groove 341, and the motor and the fan for the centrifugal fan 500 are respectively located at both sides of the thickness direction of the first fixing plate 340.

One side of the second fixing plate 350 facing away from the indoor heat exchanger 200 is provided with a second mounting groove 351, a motor of the backward centrifugal fan 600 is mounted in the second mounting groove 351, and the motor and the fan of the backward centrifugal fan 600 are respectively located at both sides of the second fixing plate 350 in the thickness direction.

The motor of the forward centrifugal fan 500 is located in the first mounting groove 341, and the motor shaft of the forward centrifugal fan 500 passes through the first fixing plate 340, and drives the fan of the forward centrifugal fan 500 located on the other side of the first fixing plate 340 to rotate. The motor of backward centrifugal fan 600 is in second mounting groove 351, and the motor shaft of backward centrifugal fan 600 passes second fixed plate 350, and the drive is located the fan rotation of the backward centrifugal fan 600 of second fixed plate 350 opposite side, from this, guaranteed preceding stability to centrifugal fan 500 and the operation of backward centrifugal fan 600, and under the condition of guaranteeing wind-guiding and heat transfer, reduced preceding thermal influence between centrifugal fan 500 and the motor of backward centrifugal fan 600 and indoor heat exchanger 200.

In some embodiments of the present invention, as shown in fig. 2 and 4, the rotation axes of the axial flow fan 400, the forward centrifugal fan 500 and the backward centrifugal fan 600 are located in the same vertical plane, and the distances between the axial flow fan 400, the forward centrifugal fan 500, the backward centrifugal fan 600 and the indoor heat exchanger 200 in the front-back direction are the same, i.e. the front-back distance between the axial flow fan 400 and the indoor heat exchanger 200, the front-back distance between the forward centrifugal fan 500 and the indoor heat exchanger 200, and the front-back distance between the backward centrifugal fan 600 and the indoor heat exchanger 200 are the same.

So, after air and indoor heat exchanger 200 heat transfer, can be in axial fan 400, preceding centrifugal fan 500, under the guide of backward centrifugal fan 600, more for even flow direction axial fan 400, preceding centrifugal fan 500, backward centrifugal fan 600, make the distribution of amount of wind more even. And axial fan 400's fan is far away from positive air outlet 101 position to axial fan 400's air-out is softer, avoids axial fan 400 closely directly to blow and influences user experience.

In some embodiments of the present invention, as shown in fig. 4, the indoor unit 1 of the air conditioner further includes an electric heating element 700.

The surfaces of the indoor heat exchanger 200 facing the axial flow fan 400, the forward centrifugal fan 500, and the backward centrifugal fan 600 are configured with recesses at the center in the width direction of the indoor heat exchanger 200, and the electric heating members 700 are provided at the recesses.

For example, the electric heating member 700 may be plural and each extend in the up-down direction. The indoor heat exchanger 200 surrounds the electric heating member 700 at the rear and both sides of the electric heating member 700 so that the indoor heat exchanger 200 and the electric heating member 700 can cooperatively exchange heat.

Other configurations and operations of the indoor unit 1 of the air conditioner according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail herein.

The air conditioner indoor unit performs a refrigeration cycle by using a compressor, a condenser, an expansion valve, and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the air that has been conditioned and heat-exchanged.

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 condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding 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 evaporator 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 evaporator can 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 outdoor unit of the air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.

The indoor heat exchanger and the outdoor heat exchanger serve as a condenser or an evaporator. The air conditioner is used as a heater in a heating mode when the indoor heat exchanger is used as a condenser, and as a cooler in a cooling mode when the indoor heat exchanger is used as an evaporator.

In the description herein, references to the description of the terms "particular embodiment," "particular example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An indoor unit for an air conditioner, comprising:

the air conditioner comprises a machine shell, a fan and a control device, wherein the machine shell is provided with a front air outlet, a side air outlet and a lower air outlet;

the indoor heat exchanger is arranged in the shell;

the air duct piece is arranged in the shell and positioned in front of the indoor heat exchanger, and is communicated with the front air outlet, the side air outlet and the lower air outlet;

the fan comprises an axial flow fan, a forward centrifugal fan and a backward centrifugal fan, wherein the axial flow fan, the forward centrifugal fan and the backward centrifugal fan are all arranged on an air duct piece and are sequentially arranged from top to bottom;

the axial position of the axial flow fan corresponds to that of the front air outlet, the side air outlets are arranged on two radial sides of the forward centrifugal fan and the backward centrifugal fan, and the lower air outlet is arranged below the backward centrifugal fan and has the same orientation as the front air outlet.

2. An indoor unit for an air conditioner according to claim 1, wherein the air duct member comprises:

the upper air duct piece is provided with an opening, the opening corresponds to the position of the positive air outlet, and the axial flow fan is installed on the upper air duct piece;

the middle air duct piece is connected below the upper air duct piece and provided with a first side air outlet, the first side air outlet is positioned at two radial sides of the forward centrifugal fan and communicated with the side air outlets, and the forward centrifugal fan is arranged on the middle air duct piece;

the lower air duct piece is connected below the middle air duct piece, the lower air duct piece is provided with a second side air outlet and a lower air duct air outlet, the second side air outlet is located on two radial sides of the backward centrifugal fan and communicated with the side air outlet, the lower air duct air outlet is located below the backward centrifugal fan and communicated with the lower air outlet, and the backward centrifugal fan is installed on the lower air duct piece.

3. An indoor unit for an air conditioner according to claim 2, wherein the upper duct member, the middle duct member and the lower duct member are integrally formed.

4. An indoor unit of an air conditioner as claimed in claim 2, wherein the axial flow fan comprises a motor and a fan, the upper duct member is provided with an air guide grid at the opening, an axial flow motor mounting groove is formed in the center of the air guide grid, and the motor of the axial flow fan is mounted in the axial flow motor mounting groove.

5. An indoor unit of an air conditioner as claimed in claim 4, wherein the air guiding grille comprises a plurality of grid pieces, the grid pieces extend in a radial spiral manner from the center of the air guiding grille to the edge of the air guiding grille, the fan of the axial flow fan extends in a radial spiral manner from the center of the air guiding grille to the edge of the air guiding grille, and the spiral directions of the air guiding grille and the fan of the axial flow fan are opposite.

6. The indoor unit of claim 2, wherein the intermediate air duct member is provided with a first air guiding portion and a second air guiding portion, the first air guiding portion and the second air guiding portion are located at two radial sides of the forward centrifugal fan, the first air guiding portion is located above the second air guiding portion, and the first air guiding portion and the second air guiding portion guide the airflow of the forward centrifugal fan to the side air outlet along the circumferential direction of the forward centrifugal fan;

the lower air duct piece is provided with a third air guide portion, a fourth air guide portion and a fifth air guide portion, the fourth air guide portion and the fifth air guide portion are located on two radial sides of the backward centrifugal fan, the third air guide portion is located above the fourth air guide portion and the fifth air guide portion, the third air guide portion and the fourth air guide portion guide airflow of the backward centrifugal fan to the side air outlet along the circumferential direction of the backward centrifugal fan, and the fifth air guide portion guide airflow of the backward centrifugal fan to the lower air outlet along the circumferential direction of the backward centrifugal fan.

7. An indoor unit of an air conditioner according to claim 1, wherein a first fixing plate is provided on a side of the air duct member facing away from the indoor heat exchanger, the first fixing plate corresponding to a position of the forward centrifugal fan mounted on the first fixing plate;

and a second fixing plate is arranged on one side of the air duct piece, which faces away from the indoor heat exchanger, the second fixing plate corresponds to the backward centrifugal fan, and the backward centrifugal fan is arranged on the second fixing plate.

8. An indoor unit for an air conditioner according to claim 7, wherein each of the forward centrifugal fan and the backward centrifugal fan comprises a motor and a fan;

a first mounting groove is formed in one side, back to the indoor heat exchanger, of the first fixing plate, a motor of the forward centrifugal fan is mounted in the first mounting groove, and the motor and the fan of the forward centrifugal fan are located on two sides of the first fixing plate in the thickness direction respectively;

one side of the second fixing plate, which faces away from the indoor heat exchanger, is provided with a second mounting groove, the motor of the forward centrifugal fan is mounted in the second mounting groove, and the motor and the fan of the backward centrifugal fan are respectively positioned on two sides of the second fixing plate in the thickness direction.

9. An indoor unit for an air conditioner according to claim 1, wherein the axial flow fan, the forward centrifugal fan and the backward centrifugal fan have rotation axes in the same vertical plane, and the axial flow fan, the forward centrifugal fan, the backward centrifugal fan and the indoor heat exchanger are at the same distance in the front-back direction.

10. An indoor unit for an air conditioner according to claim 1, further comprising:

the electric heating element, the orientation of indoor heat exchanger axial fan, preceding centrifugal fan and the surface construction of backward centrifugal fan have sunken, sunken in the width direction's of indoor heat exchanger center department, electric heating element is located the depressed place.