CN209026958U - A kind of air conditioner indoor unit - Google Patents

Abstract

The utility model discloses an indoor unit integrating air-conditioning function and fresh air function, comprising a casing (6) of the indoor unit, a fan (2), a heat exchanger (1), an air supply port (3), a return air port (4), and a fresh air port. (41), a return air volume control device (88), and a fresh air volume control device (89). When the indoor unit of the air conditioner is in cooling and heating operation, the indoor air enters the left and right cavities of the indoor unit through the air return port (4) arranged under the casing to exchange heat with the heat exchangers (1) located on both sides of the fan. The indoor air is blown to the air supply port (3) provided in the casing (6) through the blower (2) located between the heat exchangers on both sides and sent to the room. When the fresh air function of the indoor unit of the air conditioner is running, the outdoor air enters the left and right side cavities of the indoor unit through the fresh air ports (41) arranged on the left and right sides or both sides of the casing (6), and the outdoor fresh air exchanges heat with the heat exchanger (1). The outdoor fresh air that has undergone heat exchange is sent indoors through a blower (2) through an air supply port (3) provided in the casing (6).

Description

An air conditioner indoor unit

technical field

The utility model relates to an air-conditioning indoor unit, more precisely a central air-conditioning duct-type indoor unit.

Background technique

With social progress, people's living standards are improving day by day, and the air requirements for work and home environments are getting higher and higher. Central air conditioners that do not take up space, are beautifully installed, and have comfortable air conditioners are more and more widely favored by consumers. In recent years The market share of a variety of home central air conditioners is increasing day by day.

The central air-conditioning ducted indoor units on the market generally only have the functions of cooling, heating, and air supply. When the air conditioner is used for a long time, the indoor air will be dry and the concentration of carbon dioxide will increase, resulting in hypoxia that directly affects people's health. There are few central air-conditioning products on the market that can not only satisfy the cooling and heating functions but also introduce outdoor fresh air functions through the central air-conditioning ducted indoor unit. At present, the most common solution is to install two systems at the same time, one is the air-conditioning system for cooling and heating, and the other is the fresh air system that introduces outdoor fresh air, which greatly increases the cost. When the two systems are running at the same time, the following situations often occur: The system is not coordinated and controlled, and the indoor air after cooling and heating is discharged to the outside, causing unnecessary waste of electric energy.

Patent CN206861728U discloses an all-in-one fresh air air conditioner, which can not only satisfy the cooling and heating function of the room but also achieve the function of introducing fresh air into the room, but the patent CN206861728U adopts the front and rear side air intake method, which needs to be drilled on the wall or window. Larger wind tunnels connecting indoor and outdoor spaces are likely to cause damage to the building structure of the house, so the installation mode of the technology disclosed in the patent CN206861728U has great limitations.

Patent document CN106225180A discloses a brand-new air wall-mounted jet air-conditioning unit. The fresh air vent is arranged on the top of the shell (see paragraph 0046 of the specification), which is used for hanging on walls, columns, or beams (see paragraph 0049 of the specification). ), cannot be used for ceiling installation, because the ceiling installation blocks the new air outlet.

Utility model content

The utility model aims to provide a central air-conditioning duct-type indoor unit to solve the deficiencies of the prior art, and to provide a central air-conditioning duct-type indoor unit that can not only satisfy the cooling and heating function of the room but also realize the function of introducing outdoor fresh air. machine.

For solving the above-mentioned technical problems, the technical scheme of the present utility model is as follows:

An air conditioner indoor unit, comprising: a casing (6), a fan (2), and a heat exchanger (1), and the casing (6) is provided with an air supply port (3), an indoor air return port (4) and an outdoor air introduction port (41), the fan (2) includes a first fan and a second fan, the heat exchanger (1) includes a first heat exchanger and a second heat exchanger, and the first fan is arranged on the air outlet side of the first heat exchanger , the second fan is arranged on the air outlet side of the second heat exchanger, the indoor air return port (4) and the outdoor air inlet (41) are respectively located on the adjacent sides of the casing (6), and the indoor air return port (4) The air introduced with the outdoor air introduction port (41) passes through the first heat exchanger or the second heat exchanger.

In the above solution, the air supply port (3) is located on the front side of the casing (6), the indoor air return port (4) is located on one side or both sides of the bottom wall of the casing (6), and the outdoor air inlet (41) is located at the casing (6). ) on one or both sides of the left and right.

In the above solution, there are two air supply ports (3), which are respectively connected to the air outlets of the first fan and the second fan. Preferably, the two air supply ports (3) face the air outlets of the first fan and the second fan respectively.

In the above solution, the indoor air return port (4) includes a first indoor air return port and a second indoor air return port, which are respectively located on both sides of the bottom wall of the casing (6), and the outdoor air inlet (41) is located in the casing (6) one of the left and right.

In the above solution, the axial direction of the fan (2) is perpendicular to the width direction of the casing (6), that is, the axial direction of the fan (2) is perpendicular to the left and right sides of the casing (6) and parallel to the length direction of the casing (6).

In the above solution, the first heat exchanger and the second heat exchanger are located on the left and right sides of the axial direction of the fan (2).

In the above solution, the first heat exchanger and the second heat exchanger are connected in multiple bodies or provided in one piece.

In the above solution, the effective heat exchange surfaces of the first heat exchanger and the second heat exchanger are arranged inclined to the axial horizontal plane of the fan (2) or perpendicular to the axial horizontal plane of the fan (2).

In the above solution, the effective heat exchange surfaces of the first heat exchanger and the second heat exchanger are inclined toward one side of the air inlet direction of the fan (2).

In the above solution, the effective heat exchange surfaces of the first heat exchanger and the second heat exchanger are inclined to the side facing away from the air inlet direction of the fan (2).

In the above solution, a return air volume control device (88) and/or a fresh air volume control device (89) are provided at the indoor air return port (4) and/or the outdoor air inlet (41). That is, a return air volume control device (88) and a fresh air volume control device (89) are respectively provided at the indoor air return port (4) and the outdoor air inlet (41); The air volume control device (88) or the outdoor air inlet (41) is provided with a fresh air volume control device (89), and only one of the return air volume control device (88) and the fresh air volume control device (89) is provided.

In the above solution, a return air volume control device (88) is provided at the indoor air return port (4), and a fresh air volume control device (89) is not provided at the outdoor air inlet (41).

In the above solution, only the indoor air return air outlet (4) on the same side as the outdoor air inlet (41) is provided with a return air volume control device (88).

In the above solution, the outdoor air inlet (41) is provided with a fresh air volume control device (89), and the indoor air return air outlet (4) is not provided with a return air volume control device (88).

In the above solution, the return air volume control device (88) and the fresh air volume control device (89) are provided as an integrated linkage air volume control device (90), which can simultaneously control the indoor air return air volume and the outdoor air intake air volume.

In the above solution, a sealing surface is provided between the effective heat exchange surfaces of the first heat exchanger and the second heat exchanger and the casing (6).

In the above solution, the first fan and the second fan are arranged between the first heat exchanger and the second heat exchanger.

In the above solution, the indoor unit of the air conditioner adopts a modular design, and the left and right sides of the outer casing (6) are provided with a detachable first detachable shell and a second detachable shell, and the first detachable shell and the second detachable shell. The positions of the bodies are interchangeable, and the outdoor air introduction port (41) is provided in one of the first detachable casing and the second detachable casing.

In the above solution, the first detachable casing and the second detachable casing are only the left and right sides of the casing (6).

In the above solution, the controller of the indoor unit of the air conditioner and the outdoor air inlet (41) are respectively located on both sides of the casing (6). That is to say, the left and right sides of the casing (6) can be detachably installed. When arranging the outlet pipes for introducing fresh air in the room, the left and right sides of the casing (6) can be separated from the corners where the walls on both sides and the outer wall meet. A fresh air duct is installed on the near side, and the controller of the indoor unit of the air conditioner is installed on the left and right sides of the casing (6) on the side farther from the junction angle between the two sides of the wall and the outer wall.

In the above solution, the first indoor air return port and the second indoor air return port are respectively provided in the first detachable casing and the second detachable casing.

In the above solution, the first heat exchanger and the second heat exchanger are located in the first detachable casing and the second detachable casing, respectively.

In the above solution, the first indoor air return port and the second indoor air return port are located on the bottom walls of the first detachable casing and the second detachable casing, respectively, and the outdoor air inlet (41) is located in the first detachable casing. or the side of the second detachable housing. That is, the outdoor air introduction port (41) is located on one of the left and right sides of the casing (6).

The utility model also provides an installation method for a central air-conditioning duct-type indoor unit, so as to adjust the positions of the first detachable casing and the second detachable casing of the outer casing (6) according to the layout requirements of the indoor pipelines, so that the The detachable housing with the outdoor air inlet (41) is closer to the outdoor pipeline.

For solving the above-mentioned technical problems, the technical scheme of the present utility model is as follows:

An installation method of an air conditioner indoor unit, the left and right sides of a casing (6) of the air conditioner indoor unit are provided with a detachable first detachable casing and a second detachable casing, and the first detachable casing and the second detachable casing are detachable. The positions of the casings are interchangeable, and the outdoor air inlet (41) is provided in one of the first detachable casing and the second detachable casing. The removable housing is mounted on the left and right sides of the housing (6) on the side closer to the outside.

In the above solution, the air conditioner indoor unit further comprises: a casing (6), a fan (2), a heat exchanger (1), and the casing (6) is provided with an air supply port (3), an indoor air return port (4) and an outdoor air outlet (4). The inlet (41), the fan (2) includes a first fan and a second fan, the heat exchanger (1) includes a first heat exchanger and a second heat exchanger, and the first fan is arranged at the outlet of the first heat exchanger. On the air side, the second fan is arranged on the air outlet side of the second heat exchanger, the indoor air return port (4) and the outdoor air inlet (41) are respectively located on adjacent sides of the casing (6), and the indoor air return port ( 4) The air introduced from the outdoor air introduction port (41) passes through the first heat exchanger or the second heat exchanger.

In the above solution, the first detachable casing and the second detachable casing are the left and right sides of the casing (6).

In the above solution, the controller of the indoor unit of the air conditioner and the outdoor air inlet (41) are respectively located on both sides of the casing (6).

In the above solution, the indoor air return port (4) includes a first indoor air return port and a second indoor air return port, which are respectively located on both sides of the bottom wall of the casing (6), and the outdoor air inlet (41) is located in the casing (6) one of the left and right.

In the above solution, the first indoor air return port and the second indoor air return port are located on the bottom walls of the first detachable casing and the second detachable casing, respectively, and the outdoor air inlet (41) is located in the first detachable casing. or the side of the second detachable housing. That is, the outdoor air introduction port (41) is located on one of the left and right sides of the casing (6).

In the above solution, the first heat exchanger and the second heat exchanger are located in the first detachable casing and the second detachable casing, respectively.

The air conditioner indoor unit of the present utility model realizes the following functions:

1. The outdoor air can be introduced into the room according to the needs to realize the fresh air function, and the indoor air and outdoor air can be introduced into the room at the same time, and the indoor air and outdoor air passing through the heat exchanger can be sent to the room to realize the air conditioning function and the fresh air function. integration.

2. The indoor air return port (4) is provided with a return air volume control device (88), and the outdoor air inlet (41) is provided with a fresh air volume control device (89), which can control the return air volume and the fresh air volume respectively, and can also be controlled by The integrated linkage air volume control device (90) simultaneously controls the indoor air return air volume and the outdoor air intake air volume.

3. When the return air volume control device (88) is only installed at the indoor air return air outlet (4), or the fresh air volume control device (89) is only installed at the outdoor air inlet (41), a single air volume control device can be used to control the air volume. Control the introduction of indoor return air and outdoor fresh air at the same time. And after repeated tests by the applicant, it can be seen that the fresh air volume control device (89) is not installed at the outdoor air inlet (41), and the fresh air inlet is only provided with an anti-filter screen, and only the indoor air return outlet (4) is set to return. When the air volume control device (88) is used, whether fresh air is introduced can be controlled by controlling the opening angle of the return air volume control device (88). For example, when the return air volume control device (88) controls the indoor air return air outlet (4) to be opened by 50% When the fresh air inlet is provided with a filter screen, etc., the amount of fresh air introduced is small, and when the return air volume control device (88) controls the opening of the indoor air return port (4) to be less than or equal to 20%, the amount of fresh air introduced is only Meet the normal demand for fresh air volume.

4. The axial direction of the fan (2) of the air conditioner indoor unit is perpendicular to the width direction of the casing (6), that is, the axial direction of the fan (2) is perpendicular to the left and right sides of the casing (6), and the length direction of the casing (6) Parallel, it can reduce the width and depth of the shell (6). When installed indoors, it can reduce the feeling of depression brought by the indoor unit of the air conditioner. The indoor unit can choose a more reasonable installation design, reduce the installation cost, and improve the cooling effect of the air conditioner. .

5. The air supply port and the air return port are respectively arranged on the front side of the indoor unit casing and below the indoor unit casing, so that the directions of the supply air and the return air are not on the same plane, so as to avoid short circuit between the return air and the supply air.

6. According to the conventional arrangement of the outlet pipes of the room to introduce fresh air, it is close to the corners of the walls on both sides of the room and the outer wall. The side is more convenient to introduce outdoor fresh air through the air duct formed by the conventional ceiling without increasing the thickness of the air duct or the ceiling.

7. The indoor unit of the air conditioner adopts a modular design. When installing, choose to install the outdoor air inlet (41) on the left or right side of the indoor unit as required. The left and right sides of the housing (6) are provided with a removable first removable housing and a second removable housing, the positions of the first removable housing and the second removable housing are interchangeable, and the outdoor air inlet ( 41) Provided in one of the first detachable casing and the second detachable casing, the detachable casing with the outdoor air inlet (41) can be set closer to the outdoor according to the needs of the installation location. The distance can be reduced to reduce the arrangement of pipelines, thereby reducing the installation cost and making the fresh air function of the indoor unit of the air conditioner more efficient.

The utility model discloses a central air-conditioning duct-type indoor unit hoisted on the ceiling surface, which is a central air-conditioning duct-type indoor unit suitable for wide installation in the market, which can not only satisfy the cooling and heating function of the room but also realize the Introduce outdoor fresh air function.

Description of drawings

Below in conjunction with accompanying drawing and embodiment, the utility model is described in detail:

Fig. 1 is the structural representation that the heat exchanger of the utility model is inclined outwards;

Fig. 2 is the cross-sectional schematic diagram of the heat exchanger of the utility model that is inclined outward;

Fig. 3 is the top-view structure schematic diagram of the indoor unit of the air conditioner of the present invention;

FIG. 4 is a schematic cross-sectional view of the heat exchanger of the utility model being inclined inwardly;

Fig. 5 is the cross-sectional schematic diagram of the vertical arrangement of the heat exchanger of the utility model;

FIG. 6 and FIG. 7 are the overall oblique views of the utility model.

Detailed ways

Referring to Figures 1-7, the integrated indoor unit with air conditioning function and fresh air function disclosed by the present utility model includes: a casing 6, a fan 2, a heat exchanger 1, and the casing 6 is provided with an air supply port 3, an indoor air return air outlet 4 and an outdoor air outlet. The intake port 41 , the indoor air return port 4 and the outdoor air intake port 41 are located on adjacent sides of the housing 6 respectively, and the air introduced by the indoor air return port 4 and the outdoor air intake port 41 passes through the heat exchanger 1 .

The fan 2 may include a first fan and a second fan, the heat exchanger 1 may include a first heat exchanger and a second heat exchanger, the first fan is arranged on the air outlet side of the first heat exchanger, and the second fan is arranged on the air outlet side of the first heat exchanger. On the air outlet side of the second heat exchanger, the air introduced by the indoor air return port 4 and the outdoor air inlet 41 passes through the first heat exchanger or the second heat exchanger.

The air supply port 3 is located on the front side of the casing 6 , the indoor air return port 4 is located on one or both sides of the bottom wall of the casing 6 , and the outdoor air inlet 41 is located on one or both sides of the left and right sides of the casing 6 .

There are a plurality of air supply ports 3, which are connected to the air outlet of the fan 2. Preferably, the two air supply ports 3 face the air outlets of the first fan and the second fan respectively.

More than one indoor air return port 4 is arranged under the casing 6 of the indoor unit. The number of return air ports is consistent with the number of heat exchangers. The indoor air return ports 4 are located under the heat exchanger 1 in one-to-one correspondence with the heat exchangers. The air supply port 3 and the indoor air return air port are respectively arranged on the front side of the indoor unit casing and below the indoor unit casing, so that the directions of the supply air and the return air are not on the same plane, so as to avoid short circuit between the return air and the supply air. The indoor air return port 4 includes a first indoor air return port and a second indoor air return port, which are located on both sides of the bottom wall of the casing 6 respectively, and the outdoor air inlet 41 is located on one of the left and right sides of the casing 6 .

The axial direction of the fan 2 is perpendicular to the width direction of the casing 6, that is, the axial direction of the fan 2 is perpendicular to the left and right sides of the casing 6, and is parallel to the length direction of the casing 6. The directions are parallel, and the air outlet direction of the fan 2 blows toward the front air supply port 3 of the indoor unit.

The first heat exchanger and the second heat exchanger are located on the left and right sides of the axial direction of the fan 2 . The first heat exchanger and the second heat exchanger may be connected in multiple bodies or provided in one piece.

The effective heat exchange surface of the heat exchanger 1 is inclined to the axial horizontal plane of the fan 2, and the effective heat exchange surface of the heat exchanger 1 is inclined up and down, with one side facing the air intake direction of the fan, and the other side facing the indoor air return under the casing of the indoor unit. Air outlet 4. One side of the heat exchange surface of the heat exchanger 1 is provided with a trapezoidal water guiding groove 100 to guide part of the condensed dripping water of the heat exchanger 1 to the drainage groove 101 arranged at the bottom end of the heat exchanger 1 . The effective heat exchange surface of the heat exchanger 1 can also be arranged vertically with the axial horizontal plane of the fan 2. The effective heat exchange surface of the heat exchanger 1 is arranged in the left and right directions, one of which is facing the air inlet direction of the fan, and the other is facing the indoor unit shell 6. Outdoor air inlet 41 on one side or both sides.

The effective heat exchange surfaces of the first heat exchanger and the second heat exchanger are inclined toward one side of the air inlet direction of the fan 2 .

The effective heat exchange surfaces of the first heat exchanger and the second heat exchanger may also be inclined to the side facing away from the air inlet direction of the fan 2 .

The indoor air return port 4 provided under the casing 6 of the indoor unit is provided with a return air volume control device 88, the purpose of which is to adjust the opening angle of the return air volume control device 88 to adjust the indoor return air volume required by the indoor unit and the room. The required fresh air volume. When the indoor unit only starts the cooling and heating state, the opening angle of the return air volume control device 88 is relatively large to meet the indoor return air volume required by the indoor unit. When the indoor unit only activates the fresh air function, the opening angle of the return air volume control device 88 is relatively small. When the indoor unit starts the cooling and heating function and the fresh air function at the same time, the reasonable opening angle of the return air volume control device 88 is selected according to the wind resistance of the indoor return air filter and the outdoor fresh air filter, while satisfying the indoor return air volume required by the indoor unit with the required fresh air volume of the room.

The outdoor air inlet 41 on the left or right side or both sides of the casing 6 of the indoor unit is provided with a fresh air volume control device 89, the purpose of which is to adjust the opening angle of the fresh air volume control device 89 to adjust the indoor return air volume required by the indoor unit. The amount of fresh air required for the room. When the indoor unit is only in the cooling and heating state, the fresh air volume control device 89 is in a closed state to meet the indoor return air volume required by the indoor unit. When the indoor unit only activates the fresh air function, the opening angle of the fresh air volume control device 89 is relatively large to reduce the indoor return air volume and increase the introduced outdoor fresh air volume to meet the outdoor fresh air volume required by the room. When the indoor unit starts the cooling and heating function and the fresh air function at the same time, the reasonable opening angle of the fresh air volume control device 89 is selected according to the wind resistance of the indoor return air filter and the outdoor fresh air filter. The amount of fresh air required for the room.

The return air volume control device 88 and the fresh air volume control device 89 can be provided with an integrated linkage air volume control device 90, which can simultaneously control the indoor air return air volume and the outdoor air intake air volume.

A sealing surface ABCD is provided between the effective heat exchange surface of the heat exchanger 1 and the casing 6 . The sealing surface ABCD seals the space between the U-shaped copper tube parts on both sides of the heat exchanger and the upper and lower front and rear sides of the shell, so that 100% of the indoor return air or outdoor fresh air can pass through the effective heat exchange surface of the heat exchanger and improve the heat exchange of the air. Effect.

The fan 2 is arranged between the first heat exchanger and the second heat exchanger.

The air conditioner indoor unit adopts a modular design. The left and right sides of the housing 6 have a removable first removable casing and a second removable casing. The positions of the first removable casing and the second removable casing are interchangeable. , the outdoor air introduction port 41 is provided in one of the first detachable casing and the second detachable casing.

The first indoor air return port and the second indoor air return port are respectively provided in the first detachable casing and the second detachable casing.

The first heat exchanger and the second heat exchanger are located in the first removable housing and the second removable housing, respectively.

The first indoor air return port and the second indoor air return port are located on the bottom walls of the first detachable casing and the second detachable casing, respectively, and the outdoor air inlet 41 is located on the first detachable casing or the second detachable casing. side of the body. That is, the outdoor air introduction port 41 is located on one of the left and right sides of the casing 6 .

The present invention also provides an installation method of a central air-conditioning duct-type indoor unit, so as to adjust the positions of the first detachable shell and the second detachable shell of the outer casing 6 according to the layout of indoor pipelines, so that the outdoor The detachable casing of the air inlet 41 is closer to the outdoor pipeline.

One or more outdoor air inlets 41 are provided on the left or right side or both sides of the casing 6 of the indoor unit. The purpose is that the indoor unit fan sucks indoor air through the indoor air return outlet 4 and sucks outdoor fresh air through the outdoor air inlet 41 . According to the conventional arrangement of the outlet pipes for the introduction of fresh air into the room, it is the characteristics near the intersection of the walls on both sides of the room and the outer wall and the conventional ceiling characteristics of the room ceiling. The outdoor air inlet 41 is located on the left and right sides of the indoor unit casing 6 or in the One side is more convenient to introduce outdoor fresh air through the air duct formed by the conventional ceiling without increasing the thickness of the air duct or the ceiling. The outdoor air inlet 41 can be set in the form of a module, and can be installed on the left or right side of the indoor unit as required during installation.

For solving the above-mentioned technical problems, the technical scheme of the present utility model is as follows:

An installation method of an air conditioner indoor unit, the left and right sides of the housing 6 of the air conditioner indoor unit have a detachable first detachable casing and a second detachable casing, the first detachable casing and the second detachable casing. The positions are interchangeable, and the outdoor air inlet 41 is provided in one of the first detachable casing and the second detachable casing. During installation, the detachable casing with the outdoor air inlet 41 is installed in the Of the left and right sides of the housing 6, the side is closer to the outside.

The above-mentioned air conditioner indoor unit also includes: a casing 6, a fan 2, and a heat exchanger 1. The casing 6 is provided with an air supply port 3, an indoor air return port 4 and an outdoor air inlet 41, and the fan 2 includes a first fan and a second fan. The heat exchanger 1 includes a first heat exchanger and a second heat exchanger. The first fan is arranged on the air outlet side of the first heat exchanger, the second fan is arranged on the air outlet side of the second heat exchanger, and the indoor air returns. The tuyere 4 and the outdoor air inlet 41 are located on adjacent sides of the casing 6 respectively, and the air introduced by the indoor air return 4 and the outdoor air inlet 41 passes through the first heat exchanger or the second heat exchanger.

The indoor air return port 4 includes a first indoor air return port and a second indoor air return port, which are located on both sides of the bottom wall of the casing 6 respectively, and the outdoor air inlet 41 is located on one of the left and right sides of the casing 6 .

The first indoor air return port and the second indoor air return port are located on the bottom walls of the first detachable casing and the second detachable casing, respectively, and the outdoor air inlet 41 is located on the first detachable casing or the second detachable casing. side of the body. That is, the outdoor air introduction port 41 is located on one of the left and right sides of the casing 6 .

The first heat exchanger and the second heat exchanger are located in the first removable housing and the second removable housing, respectively.

When the indoor unit of the air conditioner is running for cooling and heating, the indoor air enters the left and right cavities of the indoor unit through the indoor air return port 4 arranged under the casing to exchange heat with the heat exchangers 1 located on both sides of the fan, and the indoor air after heat exchange The air is sent to the room by the blower 2 located between the heat exchangers on both sides to the air supply port 3 provided in the casing 6 . When the fresh air function of the indoor unit of the air conditioner is running, the outdoor air enters the cavity on the left and right sides or both sides of the indoor unit through the outdoor air inlets 41 arranged on the left and right sides or both sides of the casing 6, and the outdoor fresh air exchanges heat with the heat exchanger 1. The outdoor fresh air after heat exchange is sent indoors through the air blower 2 through the air supply port 3 provided in the casing 6 . When the indoor unit only activates the fresh air function and the cooling and heating function stops running, the return air volume control device (88) in the indoor air return port of the indoor unit can be in a closed state. When the indoor unit starts the cooling and heating function, the indoor unit return air outlet The return air volume control device (88) in the open state. When the indoor unit only starts the fresh air function and the cooling and heating function stops running, the fresh air volume control device (89) in the fresh air outlet of the indoor unit is turned on. When the cooling and heating function of the indoor unit and the fresh air function are running at the same time: the indoor unit The return air volume control device (88) is in a fully open state, and the fresh air demand in the control room is adjusted through the fresh air volume control device (89). With only the return air volume control device 88, when the indoor unit is only activated for cooling and heating, the opening angle of the return air volume control device 88 is relatively large to meet the indoor return air volume required by the indoor unit. When the indoor unit only activates the fresh air function, the opening angle of the return air volume control device 88 is relatively small. When the indoor unit starts the cooling and heating function and the fresh air function at the same time, the reasonable opening angle of the return air volume control device 88 is selected according to the wind resistance of the indoor return air filter and the outdoor fresh air filter, while satisfying the indoor return air volume required by the indoor unit with the required fresh air volume of the room.

Claims (21)

1. An air conditioner indoor unit, comprising: a casing (6), a fan (2), and a heat exchanger (1), and the casing (6) is provided with an air supply port (3), an indoor air return port (4) and an outdoor air outlet (4) The inlet (41) is characterized in that: the fan (2) includes a first fan and a second fan, the heat exchanger (1) includes a first heat exchanger and a second heat exchanger, and the first fan is arranged at the first heat exchanger The air outlet side of the heat exchanger, the second fan is arranged on the air outlet side of the second heat exchanger, the indoor air return port (4) and the outdoor air inlet (41) are respectively located on the adjacent sides of the casing (6). The air introduced from the air return port (4) and the outdoor air introduction port (41) passes through the first heat exchanger or the second heat exchanger. 2. The air conditioner indoor unit according to claim 1, wherein the air supply port (3) is located on the front side of the casing (6), and the indoor air return port (4) is located on one side or two sides of the bottom wall of the casing (6). The outside air inlets (41) are located on one or both sides of the housing (6) on the left and right. 3. The air conditioner indoor unit according to claim 1 or 2, characterized in that: there are two air supply ports (3), which are respectively connected to the air outlets of the first fan and the second fan. 4 . The air conditioner indoor unit according to claim 3 , wherein the two air supply ports ( 3 ) face the air outlets of the first fan and the second fan respectively. 5 . 5. The air conditioner indoor unit according to claim 1 or 2, wherein the indoor air return port (4) comprises a first indoor air return port and a second indoor air return port, which are respectively located at the bottom of the bottom wall of the casing (6). On both sides, the outdoor air inlets (41) are located on one of the left and right sides of the casing (6). 6. The air conditioner indoor unit according to claim 1 or 2, characterized in that: the axial direction of the fan (2) is perpendicular to the width direction of the casing (6), that is, the axial direction of the fan (2) is perpendicular to the casing (6) The left and right sides of the casing are parallel to the length direction of the casing (6). 7. The air conditioner indoor unit according to claim 1 or 2, wherein the first heat exchanger and the second heat exchanger are located on the left and right sides of the axial direction of the fan (2). 8. The air conditioner indoor unit according to claim 1 or 2, wherein the first heat exchanger and the second heat exchanger are multi-body connection or integrated. 9. The air-conditioning indoor unit according to claim 1 or 2, characterized in that: the effective heat exchange surfaces of the first heat exchanger and the second heat exchanger are inclined to the axial horizontal plane of the fan (2) or arranged with the fan (2). 2) The axial horizontal plane is set vertically. 10. The air conditioner indoor unit according to claim 1 or 2, wherein the effective heat exchange surfaces of the first heat exchanger and the second heat exchanger are inclined toward or away from the air inlet direction of the fan (2). . 11. The air conditioner indoor unit according to claim 1 or 2, characterized in that: a return air volume control device (88) and/or a return air volume control device (88) and/or Fresh air volume control device (89). 12. The air conditioner indoor unit according to claim 11, characterized in that a return air volume control device (88) is provided only at the indoor air return air outlet (4) on the same side as the outdoor air inlet (41). 13. The air conditioner indoor unit according to claim 11, characterized in that: the return air volume control device (88) and the fresh air volume control device (89) are provided as an integrated linkage air volume control device (90), which can simultaneously control the indoor air volume control device (90). Air return air volume and outdoor air intake air volume. 14. The air conditioner indoor unit according to claim 1 or 2, wherein a sealing surface is provided between the effective heat exchange surfaces of the first heat exchanger and the second heat exchanger and the casing (6). 15. The air conditioner indoor unit according to claim 1 or 2, wherein the first fan and the second fan are arranged between the first heat exchanger and the second heat exchanger. 16. The air conditioner indoor unit according to claim 1 or 2, wherein the left and right sides of the outer casing (6) have a detachable first detachable shell and a second detachable shell, the first detachable shell The positions of the body and the second detachable casing are interchangeable, and the outdoor air introduction port (41) is provided in one of the first detachable casing and the second detachable casing. 17. The air conditioner indoor unit according to claim 16, characterized in that: the first detachable casing and the second detachable casing are the left and right sides of the casing (6). 18. The air conditioner indoor unit according to claim 16, wherein the controller and the outdoor air inlet (41) of the air conditioner indoor unit are located on both sides of the casing (6), respectively. 19. The air conditioner indoor unit according to claim 16, wherein the first indoor air return port and the second indoor air return port are respectively provided in the first detachable casing and the second detachable casing. 20. The air conditioner indoor unit according to claim 16, wherein the first heat exchanger and the second heat exchanger are located in the first detachable casing and the second detachable casing, respectively. 21. The air conditioner indoor unit according to claim 16, wherein the first indoor air return port and the second indoor air return port are located on the bottom walls of the first detachable casing and the second detachable casing, respectively, and the outdoor The air introduction port (41) is located on the side of the first detachable casing or the second detachable casing.