CN211204233U

CN211204233U - Air duct structure of indoor unit of air conditioner and air conditioner

Info

Publication number: CN211204233U
Application number: CN201922163743.1U
Authority: CN
Inventors: 林思轩
Original assignee: Fuyang Yingtian Intelligent Technology Co ltd
Current assignee: Fuyang Yingtian Intelligent Technology Co ltd
Priority date: 2019-12-06
Filing date: 2019-12-06
Publication date: 2020-08-07
Anticipated expiration: 2029-12-06

Abstract

The utility model discloses an air duct structure of an indoor unit of an air conditioner and the air conditioner, which comprises an air inlet part, an air exchange part, an air outlet part, a base and an air conditioner shell; base: the base is arranged on the inner wall of the air conditioner shell; air inlet portion: the air inlet part is positioned above the air conditioner shell; an air exchange part: the air exchange part comprises a cross flow fan and a heat exchanger, the cross flow fan is positioned in the middle of the air conditioner shell, and the heat exchanger is positioned above the cross flow fan; air outlet part: air-out portion includes spiral case, spiral shell tongue body and aviation baffle, on the equal unable adjustment base of spiral case and spiral shell tongue body, and the spiral case is located the left side of cross flow fan below, and the spiral case is equipped with the worm end with the nearest position of cross flow fan, the utility model provides an air conditioning indoor set wind channel structure and air conditioner, this air conditioning indoor set wind channel simple structure, the reduction air conditioner noise that can show improves wind sound tone quality, and obvious breathing sound can not appear.

Description

Air duct structure of indoor unit of air conditioner and air conditioner

Technical Field

The utility model relates to an air conditioning structure design technical field specifically is a machine wind channel structure and air conditioner in air conditioning.

Background

The low pressure steam of the refrigerant in the refrigeration system is sucked by the compressor and compressed into high pressure steam, and then discharged to the condenser, thereby promoting the indoor air to continuously circulate and flow, and achieving the purpose of reducing the temperature, the continuous circulation flow of the air in the wall-mounted indoor unit of the air conditioner is completed by the cross flow fan and the motor, when the impeller of the cross flow fan rotates, the airflow enters the cascade from the opening part of the impeller, passes through the inside of the impeller, and is discharged into the volute from the other side of the cascade, forming the working airflow, the airflow velocity field is unstable, a vortex is also present in the impeller, the vortex is positioned near the volute tongue, the existence of the vortex makes the output end of the impeller generate the circulation airflow, outside the vortex, the airflow streamline in the impeller is arc-shaped, therefore, the flow velocity at each point on the outer circumference of the impeller is inconsistent, the closer to the volute, the velocity is larger, the closer to the volute, the air speed and the pressure of the air flow at the air outlet part of the fan are not uniform, so that the indoor unit can generate certain unstable noise when the air conditioner operates, impure abnormal sound of tone quality generated by the air pressure part can be generated, and even more, after the air conditioner operates for a period of time, dust or other fine substances block an air duct to bring obvious breathing sound, and the sound often influences the comfort when people use the air conditioner and even influences the sleep quality of people.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to overcome current defect, provide an air conditioning indoor set wind channel structure and air conditioner, this air conditioning indoor set wind channel simple structure, the reduction air conditioner noise that can show improves the wind sound tone quality, obvious breathing freely can not appear, can effectively solve the problem in the background art.

In order to achieve the above object, the utility model provides a following technical scheme: an air duct structure of an indoor unit of an air conditioner comprises an air inlet part, an air exchange part, an air outlet part, a base and an air conditioner shell;

base: the base is arranged on the inner wall of the air conditioner shell;

air inlet portion: the air inlet part is positioned above the air conditioner shell;

an air exchange part: the air exchange part comprises a cross flow fan and a heat exchanger, the cross flow fan is positioned in the middle of the air conditioner shell, and the heat exchanger is positioned above the cross flow fan;

air outlet part: the air outlet part comprises a volute, a volute tongue body and an air deflector, the volute and the volute tongue body are both fixed on the base, the volute is positioned on the left side below the cross-flow fan, a volute end is arranged at the position, closest to the cross-flow fan, of the volute, a flow avoiding point is arranged on the volute, the volute tongue body is positioned on the right side below the cross-flow fan, the air deflector is of a hollow structure, an upper plate and a lower plate are arranged on the air deflector, and the distance between the upper plate and the lower plate is equal to the distance between the air deflector and the volute and between the volute tongue body and the air deflector;

the cross flow fan is characterized by further comprising a dustproof net, the dustproof net is arranged between the air inlet portion and the air exchange portion, the distance between the flow avoiding point and the cross flow fan is 9-10 times of the distance between the scroll end and the cross flow fan, the distance between the flow avoiding point and the scroll tongue body is 0.45-0.55 times of the diameter of the cross flow fan, and the included angle between the flow avoiding point and the center connecting line of the scroll end and the cross flow fan is 125-130 degrees.

Furthermore, the distance between the volute end and the cross-flow fan is 4.5mm-5.5mm, a rear socket tongue is arranged at the position, above the volute end, of the volute, the rear socket tongue is designed to be a straight section with a narrow upper part and a wide lower part, the length of the rear socket tongue is 3-4 times of the distance between the volute end and the cross-flow fan, and through the design of the straight section of the rear socket tongue, the particle path of air at the edge of the pipeline can be changed stably, the resistance of the pipeline to the air is reduced, the flowing speed of the air is kept stable, and therefore the air volume and the impact noise generated by the air passing through the cross-flow fan are guaranteed to be in a lower state.

Furthermore, the volute tongue body comprises a first volute tongue and a second volute tongue, the first volute tongue and the second volute tongue are connected through a corner piece, the section of the corner piece is an involute, the base radius of the corner piece is 0.06-0.07 times of the diameter of the cross-flow fan, the distance between the volute tongue body and the cross-flow fan is 4.5-5.5 mm, the length of the first volute tongue is 0.25-0.35 times of the diameter of the cross-flow fan, working airflow generated when air enters the cross-flow fan through the air inlet part can enter the cross-flow fan along the first volute tongue and is within the effective working range of the cross-flow fan, and turbulence generated by the working airflow is reduced.

Furthermore, the compression-resistant angle of the air outlet formed by the second volute tongue and the lower part of the volute is 18-20 degrees, so that the energy loss of the working airflow in the output process can be reduced, the air outlet part forms a gradually expanding channel by setting the compression-resistant angle, the probability that mass points in the working airflow impact the volute tongue body and the volute is reduced, and the noise generated when the working airflow impacts the volute and the volute tongue body is further reduced.

Furthermore, the heat exchanger comprises a first evaporator, a second evaporator and a third evaporator, the first evaporator, the second evaporator and the third evaporator are sequentially connected together in a first position, the first evaporator, the second evaporator and the third evaporator are arranged above the cross-flow fan, the left end of the first evaporator is in contact with the base, the sealing performance of the air exchange portion can be guaranteed, noise caused by air leakage is prevented, the cross-flow fan is surrounded in the middle, and working air flow entering the heat exchanger can be guaranteed to uniformly pass through the cross-flow fan.

Furthermore, the inclination angle of the first evaporator is 0-40 degrees, the included angle of the first evaporator and the second evaporator at the joint is 0-85 degrees, the inclination angle of the third evaporator is 0-2 degrees, and the inclination angle design can ensure that water vapor in the air is attached to the evaporator and can flow down along the inclination direction of the evaporator to enter a drainage pipeline after the air is cooled by the evaporator, and can control working air flow passing through the air inlet part to uniformly pass through the evaporator.

The heat exchanger further comprises an auxiliary heat device, a cavity is formed among the first evaporator, the second evaporator and the cross-flow fan, and the auxiliary heat device is installed in the cavity and can ensure that working air flow entering the heat exchanger from the air inlet portion can enter the cross-flow fan in a balanced manner under the action of the auxiliary heat device.

Furthermore, the distance between the auxiliary heat device and the first evaporator and the distance between the auxiliary heat device and the second evaporator are both 8-20mm, the distance between the auxiliary heat device and the cross flow fan is 18-30mm, the distance between the auxiliary heat device and the vertical center line of the cross flow fan is 0-4mm, the auxiliary heat device can uniformly heat working airflow in the cavity, and meanwhile, the auxiliary heat device is located at the maximum distance from the cross flow fan, noise generated by impact of the working airflow brought by the operation of the cross flow fan on the auxiliary heat device can be minimized, and meanwhile, the function of the auxiliary heat device can be utilized to the maximum extent.

Furthermore, the air conditioner also comprises a first grid and a second grid, wherein the first grid and the second grid are positioned above the air inlet part and are connected together end to end, and a connecting line between the connecting point of the first grid and the second grid and the connecting point of the first evaporator and the second evaporator is parallel to a plumb line, so that the heat exchange of air of each part is balanced, and abnormal sound caused by unbalanced air pressure due to air temperature difference is reduced.

Furthermore, the air conditioner comprises a base, an air duct of the air conditioner indoor unit, an air conditioner panel, an air conditioner shell and a motor, wherein the air duct and the motor of the air conditioner indoor unit are fixed on the base, the motor and the air duct of the air conditioner indoor unit are all installed in the air conditioner shell, the air conditioner panel is arranged on the side face of the air conditioner shell, the input end of the air conditioner panel is electrically connected with the output end of an external power supply, the output end of the air conditioner panel is electrically connected with the input ends of the cross-flow fan, the motor, the first evaporator, the second evaporator, the third evaporator and the auxiliary heater, the air volume entering the air duct of the air conditioner indoor unit is uniformly and stably circulated through reasonable arrangement of the air duct of the air conditioner indoor unit, the evaporators and the cross-flow fans of working air in the air duct.

Compared with the prior art, the beneficial effects of the utility model are that: this machine wind channel structure and air conditioner in air conditioning has following benefit:

the air duct structure of the air conditioner indoor unit and the air conditioner simplify the air duct structure of the air conditioner indoor unit, so that the air volume entering the air duct of the air conditioner is uniform and stable in circulation, the working air flow keeps a uniform distribution state when passing through the evaporator and the cross-flow fan in the air duct of the air conditioner, turbulence is not generated, the phenomenon that the internal energy consumption is increased due to the fact that the working air flow generates a vortex at the impeller of the cross-flow fan is avoided, the impact of the working air flow on parts of the air conditioner is reduced, the noise is reduced, the wind sound is soft, and the defect that the air conditioner has obvious wind sound after dust accumulation is overcome on the premise that the wind sound quality is improved.

Drawings

FIG. 1 is a schematic cross-sectional structural view of an air duct of an indoor unit of an air conditioner and an air conditioner according to the present invention;

fig. 2 is the schematic view of the air duct and the air flow guiding of the air conditioner indoor unit of the present invention.

In the figure: the air conditioner comprises a first grid 1, a second grid 2, a dust screen 3, an air conditioner panel 4, a second evaporator 5, an auxiliary heat device 6, a third evaporator 7, a volute tongue body 8, an air deflector 9, a flow avoiding point 10, a volute 11, a cross-flow fan 12, a base 13, a rear socket tongue 14, a first evaporator 15, an air conditioner shell 16, a volute end 17, a first volute tongue 18, a corner piece 19, a second volute tongue 20, an upper plate 21 and a lower plate 22.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-2, the present invention provides a technical solution: an air duct structure of an indoor unit of an air conditioner comprises an air inlet part, an air exchange part, an air outlet part, a base 13 and an air conditioner shell 16;

base 13: the base 13 is installed on the inner wall of the air-conditioning casing 16 and is used for installing various internal parts;

air inlet portion: the air inlet part is positioned above the air conditioner shell 16 and is used for air to enter an air channel;

an air exchange part: the air exchanging part comprises a cross flow fan 12 and a heat exchanger for adjusting temperature and conveying air, the cross flow fan 12 is arranged in the middle of an air conditioner shell 16, the heat exchanger is arranged above the cross flow fan 12, the heat exchanger comprises a first evaporator 15, a second evaporator 5 and a third evaporator 7, the first evaporator 15, the second evaporator 5 and the third evaporator 7 are sequentially connected together in a head position, the first evaporator 15, the second evaporator 5 and the third evaporator 7 are arranged above the cross flow fan 12, the left end of the first evaporator 15 is contacted with a base 13, the right end of the third evaporator 7 is contacted with the air conditioner shell 16, the air exchanging part has the advantages that the sealing performance of the air exchanging part can be ensured, noise caused by air leakage is avoided, meanwhile, the first evaporator 15, the second evaporator 5 and the third evaporator 7 are arranged above the cross flow fan 12 in a surrounding mode, the cross flow fan 12 is arranged in the middle, the working airflow entering the heat exchanger can be ensured to uniformly pass through the cross flow fan 12, the inclination angle of the first evaporator 15 is 0-40 degrees, the included angle of the joint of the first evaporator 15 and the second evaporator 5 is 0-85 degrees, and the inclination angle of the third evaporator 7 is 0-2 degrees, so that the design of the inclination angles ensures that the water vapor in the air is attached to the evaporators after the air is cooled by the three evaporators, the water vapor can flow down along the inclined direction of the evaporators and enter the drainage pipeline, the working airflow passing through the air inlet part can be controlled to uniformly pass through the evaporators, the heat exchanger also comprises an auxiliary heat device 6, a cavity is formed among the first evaporator 15, the second evaporator 5 and the cross flow fan 12, the auxiliary heat device 6 is arranged in the cavity, the working airflow entering the heat exchanger from the air inlet part can be ensured to uniformly pass through the action of the auxiliary heat device 6 and then enter the cross flow fan 12, the space between the auxiliary heat device 6 and the first evaporator 15 and the second evaporator 5 is 8-20mm, the space between the auxiliary heat device 6 and the cross flow fan 12 is 18-30mm, and the space between the auxiliary heat device 6 and the vertical center line of the cross flow fan 12 is 0-4mm, and the design of the space has the advantages that the auxiliary heat device 6 is basically positioned in the middle of a cavity defined by the cross flow fan 12, the first evaporator 15, the second evaporator 5 and the third evaporator 7, the working air flow in the cavity is uniformly heated, and the distance between the auxiliary heat device 6 and the cross flow fan 12 is the maximum distance, so that the noise generated by the collision of the working air flow brought by the operation of the cross flow fan 12 on the auxiliary heat device 6 is minimized;

air outlet part: the air outlet part comprises a volute 11, a volute tongue body 8 and an air deflector 9 and is used for outputting air, the volute 11 and the volute tongue body 8 are both fixed on a base 13, the volute 11 is positioned on the left side below a cross-flow fan 12, a volute end 17 is arranged at the position, closest to the cross-flow fan 12, of the volute 11, the distance between the volute end 17 and the cross-flow fan 12 is 4.5mm-5.5mm, a rear socket tongue 14 is arranged at the position, above the volute end 17, of the volute 11, the rear socket tongue 14 is designed to be a straight section with a narrow upper part and a wide lower part, the length of the rear socket tongue 14 is 3-4 times of the distance between the volute end 17 and the cross-flow fan 12, the design has the advantages that the straight section with the narrow upper part and the wide lower part of the rear socket tongue 14 is designed, so that the particle path of the air at the edge of the pipeline is stably changed before the air enters the cross-flow fan 12 through an air inlet, the resistance of the, therefore, the air quantity and the impact noise generated by the air through the cross flow fan 12 are ensured to be in a lower state, if the distance between the scroll end 17 and the cross flow fan 12 is too large, a large part of the air around the pipeline cannot be in the effective working distance range of the cross flow fan 12, therefore, the air quantity of an air inlet is kept unchanged as long as the distance exceeds the limit, the result shows that the maximum limit is 5.5mm, if the distance between the rear socket tongue 14 and the cross flow fan 12 is less than 4.5mm, the air quantity is gradually reduced from the maximum limit value, therefore, the distance between the rear socket tongue 14 and the cross flow fan 12 is 4.5mm-5.5mm, the air inlet quantity can be ensured to be maximized, the straight section is changed accordingly, the air entering the air exchange part through the air inlet part is further guided to enter the cross flow fan 12, and the impact noise of the air to the volute 11 and the cross flow fan 12 is reduced, when the distance between the rear socket tongue 14 and the cross flow fan 12 is set to be 5mm, the total amount of air entering the cross flow fan 12 from one side of the volute 11 reaches a peak value, and noise generated at the position is controlled within a certain range, the volute 11 is provided with a flow avoiding point 10, the volute tongue body 8 is positioned at the right side below the cross flow fan 12, the volute tongue body 8 comprises a first volute tongue 18 and a second volute tongue 20, the first volute tongue 18 and the second volute tongue 20 are connected through a corner piece 19, the cross section of the corner piece 19 is an involute curve, the base circle radius of the corner piece 19 is 0.06-0.07 times of the diameter of the cross flow fan 12, the distance between the volute tongue body 8 and the cross flow fan 12 is 4.5mm-5.5mm, the length of the first volute tongue 18 is 0.25-0.35 times of the diameter of the cross flow fan 12, and working air entering the cross flow fan 12 through the air inlet part can enter along the first volute tongue 18, and is in the effective working range of the cross flow fan 12, the turbulence generated by the working air flow is reduced, when the distance between the first volute tongue 18 and the cross flow fan 12 is set to be 5mm, the total amount of the air entering the cross flow fan 12 by the working air flow at one side of the first volute tongue 18 reaches the peak value, the noise generated by the working air flow impacting the first volute tongue 18 can be controlled within a certain range, the compression angle of the second volute tongue 20 and the air outlet formed below the volute casing 11 is 18-20 degrees, the design reduces the impact of the internal mass point of the working air flow on the second volute tongue 20, further reduces the energy loss of the working air flow in the output process, sets the compression angle, allows the air outlet part to form a gradually expanding channel, reduces the probability that the mass point in the working air flow impacts the volute tongue body 8 and the volute casing 11, further reduces the noise of the working air flow impacting the volute casing 11 and the volute tongue body 8, the air deflector 9 is of a hollow structure, the upper plate 21 and the lower plate 22 are arranged on the air deflector 9, and the distance between the upper plate 21 and the lower plate 22 is equal to the distance between the air deflector 9 and the volute 11 and the volute tongue body 8, so that the air deflector 9 is basically parallel to the wind direction, the probability that the working airflow impacts the air deflector 9 is reduced, and the noise generated when the working airflow impacts the air deflector 9 is further reduced;

wherein, also include the dust screen 3, the dust screen 3 is installed between air inlet and air change part, the air is filtered by the dust screen 3 before entering the air change part, can filter the large granule dust contained in the air, because the air inlet is a relatively precise part, the large granule dust will produce the abrasion to these precise parts after entering the air change part, cause the part service life of the air change part to shorten, the addition of the dust screen 3, the part of the air change part of the protection, and then has increased the service life of the air conditioner, the interval between flow point 10 and cross-flow fan 12 is 9-10 times of the interval between cross-flow fan 12 and the worm end 17, the interval between flow point 10 and the body 8 of the worm tongue is 0.45-0.55 times of the diameter of the cross-flow fan 12, the included angle between flow point 10 and the central connecting line of the cross-flow fan 12 and the worm end 17 is 125 degrees-130 degrees, design the wind channel like this, the energy loss of the working airflow along the way can be eliminated, the working airflow is always in a laminar flow state at the air outlet part without generating turbulent flow, the noise generated when the working airflow forms turbulent flow is further reduced, the distance between the volute 11 and the cross-flow fan 12 is ensured to be larger and larger at the air outlet part, a composite gradually-expanded pipeline is formed, the resistance of the volute 11 to the working airflow is reduced, the working airflow is further ensured to be in a stable state without generating turbulent flow in the cross-flow fan 12, the air outlet is uniform, the effects of stable wind speed and good soft wind sound quality are ensured under the condition that the air quantity is gradually increased in the using process, the air conditioner also comprises a first grating 1 and a second grating 2, the first grating 1 and the second grating 2 are positioned above the air inlet part and connected together end to end, the connecting point of the first grating 1 and the second grating 2 is parallel to the vertical line of the connecting point of the first evaporator 15 and the second evaporator 5, the ratio of the area of the second grid 2 to the area of the first grid 1 is equal to the ratio of the area of the second evaporator 5 to the area of the third evaporator 7 to the area of the first evaporator 15, so that the air volume circulation of the first evaporator 15, the air volume circulation of the second evaporator 5 and the air volume circulation of the third evaporator 7 in unit area per unit time are equivalent, and the air volume circulation of the copper tubes is equivalent due to the fact that the copper tubes are uniformly distributed in the evaporators, so that the heat exchange of air in each part is balanced, and abnormal sound caused by unbalanced air pressure due to air temperature difference is reduced;

an air conditioner comprises a base 13, an air-conditioning indoor unit air duct, an air-conditioning panel 4, an air-conditioning casing 16 and a motor, wherein the air-conditioning indoor unit air duct is the air-conditioning indoor unit air duct of any one of claims 1 to 9, the air-conditioning indoor unit air duct and the motor are all fixed on the base 13, the motor and the air-conditioning indoor unit air duct are all installed in the air-conditioning casing 16, the air-conditioning panel 4 is arranged on the side surface of the air-conditioning casing 16, the input end of the air-conditioning panel 4 is electrically connected with the output end of an external power supply, the output end of the air-conditioning panel 4 is electrically connected with a cross-flow fan 12, the motor, a first evaporator 15, a second evaporator 5, a third evaporator 7 and an input end of an auxiliary heater 6, the air volume entering the air-conditioning indoor unit air duct is enabled to circulate uniformly and stably through reasonable, turbulence is not generated, so that the working airflow is prevented from generating vortex at the impeller of the cross flow fan 12, the internal energy consumption is reduced, the impact of the working airflow on parts of the air conditioner is reduced, and the effects of noise reduction and soft wind sound are achieved.

When in use: the motor drives the cross flow fan 12 to work, air enters the inside of an air conditioner shell 16 from an air inlet, passes through the dust screen 3, large particle dust in the air is filtered, then enters the air exchange part to form working airflow, the working airflow enters the heat exchanger, enters the cross flow fan 12 along the first volute tongue 18 under the action of the auxiliary heat device 6, vapor cooled by the first evaporator 15, the second evaporator 5 and the third evaporator 7 is attached to the three evaporators and can flow into a drainage pipeline along the inclined direction of the evaporators, and then the working airflow is discharged along the second volute tongue 20 and is output to the outside along the air deflector 9.

It is noted that the model of the first evaporator 15, the second evaporator 5 and the third evaporator 7 is preferably QR-03, the model of the auxiliary heat unit 6 is preferably BKR3501W, the preferred model of the cross flow fan 12 is P L D4820-G L40200, and the air conditioning panel 4 controls the operation of the first evaporator 15, the second evaporator 5, the third evaporator 7, the cross flow fan 12 and the auxiliary heat unit 6 by a method commonly used in the prior art.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides an air duct structure of machine in air conditioning which characterized in that: comprises an air inlet part, an air exchange part, an air outlet part, a base (13) and an air conditioner shell (16);

base (13): the base (13) is arranged on the inner wall of the air conditioner shell (16);

air inlet portion: the air inlet part is positioned above the air conditioner shell (16);

an air exchange part: the air exchange part comprises a cross flow fan (12) and a heat exchanger, the cross flow fan (12) is positioned in the middle of the air conditioner shell (16), and the heat exchanger is positioned above the cross flow fan (12);

air outlet part: the air outlet part comprises a volute (11), a volute tongue body (8) and an air guide plate (9), the volute (11) and the volute tongue body (8) are both fixed on a base (13), the volute (11) is located on the left side below a cross-flow fan (12), a volute end (17) is arranged at the position, closest to the cross-flow fan (12), of the volute (11), a flow avoiding point (10) is arranged on the volute (11), the volute tongue body (8) is located on the right side below the cross-flow fan (12), the air guide plate (9) is of a hollow structure, an upper plate (21) and a lower plate (22) are arranged on the air guide plate (9), and the distance between the upper plate (21) and the lower plate (22) is equal to the distance between the air guide plate (9) and the volute (11) and the volute tongue body (8);

the anti-dust screen (3) is arranged between the air inlet part and the air exchange part, the distance between the flow avoiding point (10) and the cross-flow fan (12) is 9-10 times of the distance between the scroll end (17) and the cross-flow fan (12), the distance between the flow avoiding point (10) and the scroll tongue body (8) is 0.45-0.55 times of the diameter of the cross-flow fan (12), and the included angle between the flow avoiding point (10) and the center connecting line of the scroll end (17) and the cross-flow fan (12) is 125-130 degrees.

2. An air duct structure of an indoor unit of an air conditioner according to claim 1, wherein: the distance between the volute end (17) and the cross-flow fan (12) is 4.5mm-5.5mm, a rear socket tongue (14) is arranged at the position, above the volute end (17), of the volute (11), the rear socket tongue (14) is designed to be a straight body section with a narrow upper part and a wide lower part, and the length of the rear socket tongue (14) is 3-4 times of the distance between the volute end (17) and the cross-flow fan (12).

3. An air duct structure of an indoor unit of an air conditioner according to claim 1, wherein: the volute tongue body (8) comprises a first volute tongue (18) and a second volute tongue (20), the first volute tongue (18) and the second volute tongue (20) are connected through a corner piece (19), the section of the corner piece (19) is an involute, the base radius of the corner piece (19) is 0.06-0.07 times of the diameter of the cross-flow fan (12), the distance between the volute tongue body (8) and the cross-flow fan (12) is 4.5-5.5 mm, and the length of the first volute tongue (18) is 0.25-0.35 times of the diameter of the cross-flow fan (12).

4. An air duct structure of an indoor unit of an air conditioner according to claim 3, wherein: the pressure-resistant angle of the air outlet formed by the second volute tongue (20) and the lower part of the volute (11) is 18-20 degrees.

5. An air duct structure of an indoor unit of an air conditioner according to claim 1, wherein: the heat exchanger comprises a first evaporator (15), a second evaporator (5) and a third evaporator (7), wherein the first evaporator (15), the second evaporator (5) and the third evaporator (7) are sequentially connected together in a head mode, the first evaporator (15), the second evaporator (5) and the third evaporator (7) are installed above a cross-flow fan (12), and the left end of the first evaporator (15) is in contact with a base (13).

6. An air duct structure of an indoor unit of an air conditioner according to claim 5, wherein: the inclination angle of the first evaporator (15) is 0-40 degrees, the included angle of the joint of the first evaporator (15) and the second evaporator (5) is 0-85 degrees, and the inclination angle of the third evaporator (7) is 0-2 degrees.

7. An air duct structure of an indoor unit of an air conditioner according to claim 5, wherein: the evaporator is characterized by further comprising an auxiliary heat device (6), a cavity is formed among the first evaporator (15), the second evaporator (5) and the cross-flow fan (12), and the auxiliary heat device (6) is installed in the cavity.

8. An air duct structure of an indoor unit of an air conditioner according to claim 7, wherein: the space between the auxiliary heat device (6) and the first evaporator (15) and the space between the auxiliary heat device and the second evaporator (5) are both 8-20mm, the space between the auxiliary heat device (6) and the cross flow fan (12) is 18-30mm, and the space between the auxiliary heat device (6) and the vertical center line of the cross flow fan (12) is 0-4 mm.

9. An air duct structure of an indoor unit of an air conditioner according to claim 1, wherein: still include first grid (1) and second grid (2), first grid (1) and second grid (2) are located the top of air inlet portion, and end to end links together, and the line in the tie point of first grid (1) and second grid (2) and the tie point of first evaporimeter (15) and second evaporimeter (5) is parallel with the plumb line.

10. An air conditioner, characterized in that: the air conditioner indoor unit air duct comprises a base (13), an air conditioner indoor unit air duct, an air conditioner panel (4), an air conditioner shell (16) and a motor, wherein the air conditioner indoor unit air duct is the air conditioner indoor unit air duct of any one of claims 1 to 9, the air conditioner indoor unit air duct and the motor are both fixed on the base (13), the motor and the air conditioner indoor unit air duct are all installed in the air conditioner shell (16), the air conditioner panel (4) is arranged on the side face of the air conditioner shell (16), the input end of the air conditioner panel (4) is electrically connected with the output end of an external power supply, and the output end of the air conditioner panel (4) is electrically connected with the input ends of a cross flow fan (12), the motor, a first evaporator (15), a second evaporator (5), a third evaporator (7).