CN114562786A - Air cleaning device and air cleaning system including air cleaning device - Google Patents

Abstract

An air purification device is used to purify the air in a target space. The air purification device includes a main body, an air supply pipe section and an air intake component. The upper part of the main casing of the main body is provided with a fan assembly, and the middle and lower part of the main casing is provided with a purification assembly. The air supply pipe section is connected to the upper part of the main casing, and includes an air outlet, and the air outlet blows out to the air supply air duct above the target space. The air inlet part is connected to the lower part of the main casing, and includes an air inlet, and the air flow from the return air duct enters the main casing from the air inlet. The air purification device can effectively avoid turbulence in the target space, reduce the diffusion of pollutants in the target space, and can effectively purify the air flowing through the interior of the main body. An air purification system including the air purification device is also disclosed.

Description

Air cleaning device and air cleaning system including air cleaning device

technical field

The present application relates to the field of indoor air conditioning, and in particular, to an air purification device capable of purifying and circulating indoor air and an air purification system including the device.

Background technique

An air purification system is a common indoor air conditioning system, which is used to circulate air in an enclosed or semi-enclosed indoor space to purify the air in the indoor space.

At present, the common air purification systems on the market generally use to directly suck air from the indoor space, and after purifying the air, blow the purified air to the indoor space, so as to realize the circulation and purification of the air in the indoor space. However, the suction and supply air of the air purification system with this structure are directly directed towards the indoor space, and its purification effect will be affected by the turbulence generated, especially for respiratory infectious diseases transmitted in the form of droplets and aerosols For pathogens (such as influenza virus, new coronavirus, etc.), the anti-pollution effect of the air purification system is limited. Although the air purification system can reduce the concentration of pathogens in the indoor space through air circulation, it cannot completely prevent the spread of pathogens in the indoor space. risk of disease transmission.

Therefore, there is a need for a device and system with an improved structure, which can reduce or even prevent turbulence in the indoor space during the purification of the air, thereby improving the air purification effect.

SUMMARY OF THE INVENTION

The present application is made to solve the above problems in the prior art, and its purpose is to provide an air purification device with an improved structure, which can efficiently purify the air in the target space and avoid the generation of air pollution in the space. Disturbance and the diffusion of pollutants.

The present application relates to an air purification device for purifying the air in a target space. The air purification device includes:

a main body, the main body includes a main casing, a fan assembly is arranged on the upper part of the main casing, and a purification assembly is arranged in the middle and lower part of the main casing;

The air supply duct section is connected to the upper part of the main housing, wherein at least a part of the air supply duct section is arranged in the air supply air duct, so that the air outlet of the air supply duct section is located in the air supply air duct, or the air supply duct section is located in the air supply air duct. The air outlet is connected to the air supply air duct, so that the air flow from the main body passes through the air supply duct section and is blown out from the air outlet to the air supply air duct, and the air supply air duct is located above the target space and partially communicated with the target space; and

The air inlet part is connected to the lower part of the main casing and includes an air inlet from which the air flow from the return air duct enters the main casing, and the return air duct is located under the floor of the target space or placed in the Below and/or above furniture in the target space and in partial communication with the target space.

For the air purification device of the above structure, the air flow from the main body is allowed to enter the air supply air duct above the target space and separated from the target space through the air supply duct section, and then air is supplied from the air supply air duct to the target space, from the top to the air supply air duct. The airflow is conveyed underground, so that the air turbulence generated in the target space can be reduced or avoided, which can inhibit the upward diffusion of pollutants in the target space, purify the target space more effectively, and prevent cross-infection. In addition, the return air duct is located below the target space, so that the airflow in the target space can enter the return air duct downward, and then enter the main body of the air purification device through the return air duct, which further helps to control the airflow from above. Flow down, further reducing turbulence in the target space.

Preferably, when the return air duct is located under the floor of the target space, the air inlet of the air inlet component includes a flared portion, and the flared portion has an inclined wall inclined toward the direction in which the airflow enters. The setting of the flared portion of the air inlet component can increase the turning angle of the air flow when the air is sucked in from the return air duct, which helps to reduce the wind resistance loss of the air flow.

Optionally, the air cleaning device further comprises: a heat exchanger, the heat exchanger is located in the main housing and is disposed obliquely with respect to the longitudinal axis of the main body, wherein the heat exchanger is used for heat exchange of the air flow passing through the heat exchanger ; and a drain pan, which is located below the heat exchanger so as to be able to receive condensate water formed on the heat exchanger. In this way, the temperature of the inhaled airflow can be adjusted.

Preferably, the angle formed by the heat exchanger with the longitudinal axis is not greater than 45°.

Preferably, the heat exchanger includes fins made of hydrophilic material.

In an exemplary structure, the drain pan includes: a first water receiving groove, the first water receiving groove is located below the lower side of the heat exchanger; and a second water receiving groove, the second water receiving groove communicates with the first water receiving groove . In one embodiment, the second water receiving channel extends perpendicular to the first water receiving channel. Wherein, the airflow can pass through the space enclosed by the first water receiving groove and the second water receiving groove.

By arranging the heat exchanger at an angle, the condensed water condensed on the heat exchanger can be made to flow onto one side of the heat exchanger and then fall into the drain pan, so that the drain pan can be provided with a supply air such as an opening. Space. The fins made of hydrophilic material further ensure that the condensed water can flow along the heat exchanger to its lower side. In one embodiment, the second water receiving tank may be used to receive condensed water generated on the heat exchanger located above it.

For the drain pan, preferably, the connection between the first water receiving groove and the second water receiving groove is the lowest part of the drain pan, where the lowest part can be connected to the drain pipe to receive the drain pan. of condensed water.

Preferably, the purification assembly is located below the heat exchanger and drain pan. In this way, the air flow is first purified by the purification component before entering other components such as heat exchangers.

In an optional embodiment, the main casing of the air purification device further has a fresh air inlet leading to the outside, and the fresh air inlet is arranged in the middle and upper part of the main casing. A fresh air inlet is arranged in the upper and middle part of the main shell, so that the fresh air inlet can correspond to the position of the building window, so as to allow openings on the window to introduce fresh air. The fresh air introduction structure is simple and easy to set, and it is used for introducing The pipe section of the fresh air is also relatively short. Moreover, the provision of such a fresh air introduction structure is particularly beneficial when openings are not allowed in the wall of the building.

Alternatively, the main casing of the air purification device also has a fresh air inlet leading to the outside, and an air volume regulating valve is arranged in the fresh air inlet to adjust the intake of fresh air.

In an optional embodiment, the air purification device further includes a fresh air introduction chamber located in the main casing, and the fresh air introduction chamber includes a fresh air inlet leading to the outside, a fresh air outlet leading to the interior of the main casing, and a fresh air The filter screen, the fresh air outlet is located under the heat exchanger and the drain pan. The fresh air filter can be arranged at the fresh air inlet, the fresh air introduction room and/or the fresh air outlet.

Alternatively, the air purification device further includes a fresh air introduction chamber located in the main casing, the fresh air introduction chamber includes a fresh air inlet leading to the outside and a fresh air outlet leading to the interior of the main casing, and also includes a purification component, wherein the purification component There are various purification filters, and the fresh air outlet is arranged below at least one purification filter. Through such a structure, the incoming fresh air is mixed with the return air while passing through the purification component, and then flows from the purification component to the heat exchanger in an even-flow manner, which can reduce the heat exchanger caused by the temperature difference of the fresh air. formation of condensed water.

In order to facilitate the maintenance of various components in the air purification device, several maintenance windows are arranged on the main casing. For example, a first access window may be provided at a location corresponding to the fan assembly. As another example, a second access window may be provided, the second access window being located at a position corresponding to the purification assembly. Providing separate access windows for different components in the main body of the air cleaning device may allow the access windows to be located closer to the components to be serviced for easy access.

The present application also discloses an air purification system, which includes the above air purification device. In addition, the air purification system preferably further comprises: at least one end air supply device, which blows the airflow from the air supply air duct to the target space; and at least one end air suction device, which blows the target space The airflow in the space is drawn to the return air duct. Here, the air purification device in the air purification system may be an independent device, allowing individual design and installation according to specific application occasions.

Among them, the supply air duct and the return air duct can be formed in various forms. For example, the air supply air duct is constituted by an air supply duct, and the air supply duct communicates with the terminal air supply device. The return air duct is composed of a return air duct, and the return air duct is communicated with the end suction device.

Or for another example, a partition is provided between the target space and the air supply duct, and the end air supply device is arranged on the partition. The end suction device is placed on the floor of the target space.

Description of drawings

The non-limiting preferred implementation structures of the present application are shown in the accompanying drawings, and the features and advantages of the present application can be made more obvious in conjunction with the accompanying drawings. in:

1 shows a side cutaway view of an exemplary structure of a first embodiment of an air purification device of the present application, wherein a return air duct is located below the floor of the target space.

FIG. 2 shows a side cutaway view of an exemplary structure of a second embodiment of the air cleaning device of the present application, in which a terminal air supply device and a terminal air suction device are additionally provided.

3 shows a side cutaway view of an exemplary structure of a third embodiment of the air purification device of the present application, wherein a return air duct is provided near furniture such as a table.

FIG. 4 shows a schematic structure of the drain pan in the air purification device shown in FIG. 1 .

(Symbol Description)

1 Air purification device

2 target space

3 ceilings

4 floors

5 tables

10 Subjects

11 Main body

12 Fan assembly

13 Purification components

14 Heat Exchanger

15 Control Components

20 Air supply duct section

21 Air outlet

22 Air supply duct

23 Air outlet

24 End air supply

30 Air intake parts

31 air inlet

32 Flare part

33 Return air duct

34 Air intake

35 End suction device

40 Drain pan

41 First sink

42 Second sink

43 Space

51 Fresh air inlet

52 Fresh air introduction room

53 Fresh air outlet

54 Fresh air filter

61 First access window

62 Second access window

Detailed ways

In order to facilitate understanding of the present application, specific embodiments of the present application will be described below with reference to the accompanying drawings. However, it should be understood that the accompanying drawings are merely preferred embodiments of the present application, which do not limit the scope of the present application. Those skilled in the art can make various obvious modifications, variations and equivalent replacements to the present application on the basis of the embodiments shown in the accompanying drawings, and under the premise of no contradiction, the technical features in different embodiments can be Any combination, and these fall within the protection scope of the present application.

<First Embodiment>

FIG. 1 shows a side sectional view of an air purification device 1 according to an exemplary first embodiment of the present application, wherein the specific internal structure of the air purification device 1 is shown.

The air cleaning device 1 includes a main body 10 having a main casing 11 in which a plurality of functional components of the air cleaning device 1 are accommodated. As exemplarily shown in FIG. 1 , a fan assembly 12 and a purification assembly 13 are provided in the main housing 11 . The fan assembly 12 is located on the upper part of the main casing 11 , and through the operation of the fan assembly 12 , an air flow is blown to the air supply duct section 20 which will be described in detail below. The purification assembly 13 is preferably located in the middle and lower part of the main casing 11 , or below the fan assembly 12 , and is used to filter and purify the airflow drawn into the main body 10 of the air purification device 1 .

The purification assembly 13 may include one or more filter purifiers. Exemplary types of filter purifiers include: high-efficiency air filters (HEPA), filters that can filter PM2. Filters (such as photocatalytic filters), etc. The purification assembly 13 may include a variety of different filter purifiers layer by layer, for example, a filter (such as activated carbon, etc.) that can filter larger particles, a filter screen for filtering PM2.5, a filter screen for filtering PM2. Purification filters that can kill viruses, etc. Of course, the purification assembly 13 may also only include a single-layer filter, which is also within the scope of the present application. The purification assembly 13 may also include other purification modules, such as a negative ion generation purification device, a streamer discharge purification device, and the like.

The air purification device 1 further includes an air supply pipe section 20 disposed on the upper part of the main body 10 , the air supply pipe section 20 extends upward from the upper end of the main body 10 and leads to an air supply air duct 22 located above the target space 2 . The air supply duct section 20 has an air outlet 21 leading to the air supply air duct 22, and preferably has a turning portion, so that the air outlet 21 faces a horizontal direction, so that the airflow from the bottom to the top from the main body 10 can flow from the outlet The tuyere 21 blows into the air supply duct 22 substantially horizontally.

The supply air duct 22 can be implemented in various ways. For example, in the exemplary structure shown in FIG. 1 , a partition such as a ceiling 3 is provided above the target space 2 , and the ceiling 3 partitions a space separated from the target space 2 above the target space 2 , the space serves as the air supply air duct 22 . At least a part of the air supply duct section 20 is positioned in this air supply air duct 22 such that its air outlet 21 is located in the air supply air duct 22 . At least one air supply port 23 is opened on the ceiling 3 , and the airflow in the air supply air duct 22 is blown downward into the target space 2 through the air supply port 23 . The air outlet 23 may take various suitable forms, for example, may include a grille or the like.

As an alternative to the above-mentioned air supply duct 22 , an air supply duct (not shown) can be provided at the top of the target space 2 to realize the air supply air duct 22 . One end of the air supply pipe is connected to the air outlet 21 of the air supply pipe section 20 , and the other end is connected to the air supply port 23 .

In the exemplary structure of the air purification device 1 shown in FIG. 1 , the air purification device 1 further includes an air intake part 30 connected to the lower part of the main body 10 , and the air intake part 30 includes an air inlet leading to the return air duct 33 31.

In the structure shown in FIG. 1 , the return air duct 33 is realized by the space formed under the floor 4 in the target space 2 . The space under the floor 4 is used as the return air duct 33 , and there is no need to install additional air ducts, the cost is low, and it is easy to implement, and will not be affected by the wire grooves under the floor and the like. At least one air suction port 34 is opened on the floor 4 , and through the air suction port 34 , the airflow can be sucked into the return air duct 33 from the target space 2 in a substantially downward direction. Similar to the air supply opening 23, the air suction opening 34 may also comprise any suitable structure, such as a grill structure or the like. As an alternative to the above-mentioned return air duct 33, a return air duct can be provided at the bottom of the target space 2 as the return air duct 33. One end of the return air duct is connected to the air inlet 31 of the air inlet component 30, and the other end is connected to the air inlet 31. Air intake 34.

Preferably, as shown in FIG. 1 , the air inlet 31 of the air inlet member 30 includes a flared portion 32 , and the flared portion 32 has an inclined wall inclined toward the direction in which the airflow enters. The setting of the flared portion 32 increases the turning angle of the return air flow into the air inlet member 30 , so that the air flow can flow into the air inlet member 30 more smoothly and reduces the wind resistance.

Alternatively, when the return air duct 33 is in the form of a return air duct, a larger radius elbow can be used at the connection between the air inlet component 30 and the return air duct 33 to achieve smoother airflow and reduce wind resistance. The return air duct can be set under the floor or in the middle and lower part of the target space.

The air purification device 1 supplies air to the supply air duct 22 through the air outlet 21, and sucks air from the return air duct 33 through the air inlet 31, thereby reducing the airflow disturbance in the target space. The air duct 33 is partially communicated with the target space, so that the air purification device 1 can realize the purification treatment of the air in the target space.

In addition, the above-mentioned air purification device 1 , the air supply duct 22 , the air supply port 23 , the return air duct 33 and the air intake port 34 together constitute an air purification system in the target space 2 .

Further, as an optional component, a heat exchanger 14 may also be provided in the main casing 11 of the air purification device 1 , and the heat exchanger 14 is located between the fan assembly 12 and the purification assembly 13 . Also, as best shown in the figures, the heat exchanger 14 is disposed obliquely with respect to the longitudinal axis of the body 10 . The angle between the heat exchanger 14 and the longitudinal axis of the body 10 is preferably less than 45°.

In order to prevent the condensed water on the heat exchanger 14 from dripping onto the purification assembly 13 or other components of the main body 10 , a drain pan 40 is also provided below the heat exchanger 14 , and the drain pan 40 is also slightly inclined relative to the longitudinal axis of the main body 10 . set up. 4, the drain pan 40 includes a first water receiving groove 41 and a second water receiving groove 42, the first water receiving groove 41 is located under the lower side of the heat exchanger 14, and the second water receiving groove 42 is It extends substantially perpendicular to the first water receiving groove 41 . The first water receiving groove 41 and the second water receiving groove 42 together enclose a space 43, and the space 43 allows airflow to pass through.

Preferably, the connection part 44 between the first water receiving groove 41 and the second water receiving groove 42 of the drain pan 40 is the lowest part in the drain pan 40 .

Further, in order to ensure that the condensed water on the heat exchanger 14 flows to the lower side of the heat exchanger 14 and then flows into the drain pan 40, the fins of the heat exchanger 14 can be made of hydrophilic materials.

Based on what has been disclosed above, by arranging the heat exchanger 14 and the drain pan 40 to be inclined, and forming the fins of the heat exchanger 14 from a hydrophilic material, the condensed water on the heat exchanger 14 can flow to one side and then again. Flow into the drain pan 40, so that a portion of the drain pan 40 can be made hollow, as shown in FIG. 4, to allow airflow therethrough.

Preferably, as shown in FIG. 1 , a fresh air inlet 51 leading to the outside of the target space 2 is formed on the main casing 11 , and the fresh air inlet 51 is located on the side wall of the main casing 11 and is in the The position of the middle and upper part of the body 11 . The fresh air inlet 51 is preferably provided with an air volume regulating valve, such as a damper with an adjustable opening, an air deflector, etc., to adjust the fresh air volume sucked into the air purification device 1 from the outside.

Corresponding to the fresh air inlet 51 , a part of the space in the main casing 11 can be further divided as a fresh air introduction chamber 52 , and the fresh air inlet 51 leads into the fresh air introduction chamber 52 . The fresh air introduction chamber 52 further includes a fresh air outlet 53 leading to the interior of the main casing 11 . In addition, a fresh air filter 54 may also be provided at the fresh air inlet 51 , in the fresh air introduction chamber 52 and/or at the fresh air outlet 53 , so as to filter and purify the fresh air in advance before sending the fresh air into the main housing 11 .

The fresh air outlet 53 is preferably located below the heat exchanger 14 and the drain pan 40 . And more preferably, the fresh air outlet 53 is located below the purification assembly 13 . When the purification assembly 13 includes multiple purification filters arranged in sequence, the fresh air outlet 53 is located below at least one of the purification filters, for example, the only filter that can filter larger particles (such as activated carbon, etc.) and / or filter the PM2.5 filter and / or the lower part of the high-efficiency air filter (HEPA) to remove the particulate matter in the fresh air, etc., to avoid affecting the indoor air quality.

Further preferably, in order to facilitate the maintenance of various components in the air purification device 1, a plurality of maintenance windows are provided on the main casing 11 of the main body 10, specifically, a portion of the main casing 11 facing the target space 2 is provided. Access windows are provided on the side walls. For example, a first access window 61 is opened at a position of the main casing 11 corresponding to or adjacent to the fan assembly 12 . For another example, the second access window 62 may be opened at a position of the main housing 11 corresponding to or adjacent to the purification assembly 13 . Besides, more inspection windows can be opened to facilitate inspection of components such as the heat exchanger 14 , the drain pan 40 , and the fresh air introduction chamber 52 .

As further shown in FIG. 1 , the main body 10 of the air purification device 1 is also preferably provided with a control assembly 15 , which is installed on the inner wall of the main housing 11 in the illustrated structure, located at The upper middle part of the main body 10 . The operation of the components in the air purification device 1 (eg, the fan assembly 12 , the purification assembly 13 , etc.) is controlled by the control assembly. In addition to the position shown in FIG. 1 , the control assembly 15 can also be disposed at other suitable positions on the air purification device 1 , including the inner lower side of the main casing 11 , the outside of the main casing 11 , and the air supply duct section. 20, the suction part 30, and so on.

<Second Embodiment>

FIG. 2 shows a side cutaway view of the air cleaning device 1 of an exemplary second embodiment of the present application. Here, for the sake of simplicity, the same components as those in the first embodiment are denoted by the same reference numerals. In addition, the following will mainly describe the technical features of the second embodiment that are different from or additional to the first embodiment, unless there is a contrary description in the following content or conflicts with other technical features, the features described in the first embodiment are also applicable In the second embodiment, detailed description is omitted here.

As shown in FIG. 2, as an optional structure, at least one terminal air supply device 24 can be provided on the ceiling 3, and the fluid communication between the air supply air duct 22 and the target space 2 can be realized through the terminal air supply device 24, Thus, the airflow in the air supply air duct 22 can be blown into the target space 2 . The outlet of the terminal air blowing device 24 communicates with the air supply port 23 , or the air supply port 23 is a part of the terminal air blowing device 24 . The air outlet of the air supply duct section can also be connected to the end air supply device 24 through an air duct.

In an exemplary example, the terminal air supply device 24 may be an indoor unit of an air conditioner, and the air supply air duct 22 communicates with the indoor unit. Still alternatively, the terminal air supply device 24 may be an assembly including components such as a heat exchanger and/or a fan and/or a damper, so that the air flow from the air supply air duct 22 can be further adjusted to match the air flow in the target space 2 . Specific air conditioning requirements.

Similar to the end air supply device 24 provided on the ceiling 3 , optionally, at least one end air suction device 35 may be provided on the floor 4 . The inlet of the terminal air suction device 35 is communicated with the air suction port 34 , or the air suction port 34 is a part of the terminal air suction device 35 . As an additional means, a fan and/or damper may also be included in the end suction device 35 to assist in drawing air flow from the target space 2 .

<Third Embodiment>

FIG. 3 shows a side sectional view of the air purification device 1 according to the third embodiment of the present application. The following will mainly describe the technical features of the third embodiment that are different from or additional to the first and second embodiments, unless there is a contrary description in the following content or conflicts with other technical features. The features are also applicable to the third embodiment and will not be described in detail here.

As shown in FIG. 3 , as an addition or alternative to the first and second embodiments, a return air duct 33 may be formed in the target space 2 . For example, if furniture such as a table 5 is placed in the target space 2, the air inlet 31 of the air inlet part 30 is opened on the side wall of the main casing, facing the space above the floor 4 and below the table 5, or the table 5 The space on the table, or the edge of the table 5 is opened. Therefore, the space between the floor 4 and the table top of the table 5 (for example, a part of the space near the bottom of the table 5 ) forms the return air duct 33 , or a part of the space on the table forms the return air duct 33 , or on the table top A return air duct is formed at the same time as the desktop. Optionally, a return air duct extending from the air inlet 31 is provided, and the return air duct extends to the bottom of the table 5 or on the table top of the table 5 . In another optional embodiment, the return air duct 33 is a return air duct, which is arranged under the table 5 (for example, the lower surface of the table top of the table 5 ), and the air suction port extending from the return air duct 33 may be located at the bottom of the table 5 . On the table top, below the table top of the table 5, or below the table top of the table 5 near the edge of the table, it is also within the scope of the present application.

Wherein, when the return air duct 33 (defined by the return air duct) is arranged under the table top of the table 5, the use of the table space is not affected, but the negative space under the table that is usually not used can be utilized. However, when the space under the desktop itself is provided with a wire slot or is blocked by a drawer cabinet, the return air duct 33 (defined by the return air duct) is arranged on the desktop of the desk 5 to facilitate installation and formation of the air purification system.

In addition, when the return air ducts are all arranged above and/or below the table 5, the return air duct and the table together constitute a return air duct, and an air outlet is opened on the table to communicate with the return air duct, which can be closer to people (pollution sources) , can take away pollutants more quickly.

When a part of the return air duct is arranged above the table 5, and a part is arranged below the table, for example, the end close to the air inlet 31 of the main casing of the air purification device is arranged below the table, so that the airflow can enter the main casing more smoothly, and also It can be ensured that there is enough space in the main casing to arrange the filter screen assembly, heat exchanger, fan assembly, etc. located above the air inlet 31 .

In addition to the exemplary table 5, the return air duct 33 may also be provided as described above with respect to other types of furniture, such as beds, cabinets, and the like.

In an optional embodiment, at least the main body of the air purification device 1 is arranged in the next room of the target space, and the air supply to the air outlet air duct on the target space and the return air to the target space are realized through the hole through the wall Road suction. In an optional embodiment, the air purification device 1 is provided inside the cabinet, the top wall of the cabinet is provided with an opening, and the air supply pipe section passes through the opening; The air inlet of device 1 is connected.

The preferred structure of the air purification device 1 of the present application and some modifications thereof are described above, and those skilled in the art can make other obvious modifications and modifications on this basis, which are all within the scope of the present application.

Claims (17)

1. an air purification device, the air purification device purifies the air in the target space, it is characterized in that, the air purification device comprises: a main body, the main body includes a main casing, a fan assembly is disposed on the upper part of the main casing, and a purification assembly is disposed in the middle and lower part of the main casing; an air supply pipe section, the air supply pipe section is connected to the upper part of the main casing, wherein at least a part of the air supply pipe section is arranged in the air supply air duct, so that the air outlet of the air supply pipe section is located in the air supply air or the air outlet of the air supply duct section is connected to the air supply air duct, so that the air flow from the main body passes through the air supply duct section and is blown out from the air outlet to the air supply air duct. A supply air duct is located above the target space and partially communicated with the target space; and The air inlet part is connected to the lower part of the main casing and includes an air inlet through which the air flow from the return air duct enters the main casing, and the return air duct is located in the main casing. The target space is below the floor or below and/or above furniture placed in the target space and is partially in communication with the target space. 2 . The air purification device according to claim 1 , wherein when the return air duct is located under the floor of the target space, the air inlet of the air inlet component comprises a flared portion, so the The flared portion has an inclined wall inclined toward the direction in which the airflow enters. 3. The air purification device of claim 1, wherein the air purification device further comprises: a heat exchanger located in the main housing and disposed obliquely with respect to a longitudinal axis of the main body, wherein the heat exchanger is used to exchange heat with the airflow passing through the heat exchanger; and A drain pan is located below the heat exchanger so as to be able to receive condensate water formed on the heat exchanger. 4. The air purification device of claim 3, wherein the included angle formed by the heat exchanger and the longitudinal axis is not greater than 45°. 5. The air purification device of claim 3, wherein the heat exchanger comprises fins made of hydrophilic material. 6. The air purification device of claim 3, wherein the drain pan comprises: a first water receiving trough located below the lower side of the heat exchanger; and a second water receiving groove, the second water receiving groove is communicated with the first water receiving groove and extends perpendicular to the first water receiving groove; Wherein, the airflow can pass through the space enclosed by the first water receiving groove and the second water receiving groove. 7 . The air purifier according to claim 6 , wherein the connecting portion between the first water receiving groove and the second water receiving groove is the lowest portion of the drain pan. 8 . 8. The air purification apparatus of claim 3, wherein the purification assembly is located below the heat exchanger and the drain pan. 9 . The air purification device according to claim 1 , wherein the main casing of the air purification device further has a fresh air inlet leading to the outside, and the fresh air inlet is arranged on the main casing. 10 . upper middle. 10 . The air purification device according to claim 1 , wherein the main casing of the air purification device further has a fresh air inlet leading to the outside, and an air volume regulating valve is arranged in the fresh air inlet. 11 . 11. The air purification device according to claim 3, characterized in that, the air purification device further comprises a fresh air introduction chamber located in the main housing, and the fresh air introduction chamber comprises a fresh air inlet leading to the outside , leading to the fresh air outlet and the fresh air filter screen inside the main casing, the fresh air outlet is located below the heat exchanger and the drain pan. 12. The air purification device according to claim 1 or 8, characterized in that, the air purification device further comprises a fresh air introduction chamber located in the main casing, and the fresh air introduction chamber comprises fresh air leading to the outside an air inlet and a fresh air outlet leading to the interior of the main casing, The purification assembly has a variety of purification filters, The fresh air outlet is arranged below at least one of the purification filters. 13. The air purification device according to claim 1, wherein the main casing is provided with: a first access window located at a position corresponding to the fan assembly; and/or A second access window is located at a position corresponding to the purification assembly. 14. An air purification system, characterized in that the air purification system comprises: The air purification apparatus according to any one of claims 1 to 13. 15. The air purification system of claim 14, wherein the air purification system further comprises at least one terminal air supply device, the terminal air supply device directs the airflow from the air supply air duct to the target space blowing; and It also includes at least one end air suction device, the end air suction device sucks the airflow of the target space to the return air duct. 16. The air purification system according to claim 15, wherein the air supply duct is composed of an air supply pipe, and the air supply pipe communicates with the end air supply device; and/or The return air duct is composed of a return air duct, and the return air duct communicates with the end air suction device. 17. The air purification system according to claim 15, wherein a partition is provided between the target space and the air supply duct, and the end air supply device is arranged on the partition; and / or The end suction device is arranged on the floor of the target space.

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