Filter assembly, indoor unit and air conditioner

Abstract

The application provides a filter assembly, an indoor unit and an air conditioner, and relates to the technical field of air conditioners. The filter assembly comprises a filter screen without adsorption and a skeleton with adsorption. The skeleton comprises a frame body, the frame body surrounds a mounting opening, and the filter screen is arranged in the mounting opening. The indoor unit comprises a shell and the filter assembly. The shell is provided with an air inlet, and the frame body of the filter assembly is connected to the shell and corresponds to the air inlet. The air conditioner comprises an outdoor unit and the indoor unit. The indoor unit and the outdoor unit are connected through a refrigerant pipe to form a refrigerant circulation. The filter assembly has good filtering effect on airflow, and the filter screen is not easy to be blocked, so that the air inlet amount of the indoor unit can be ensured, and the temperature regulation efficiency of the indoor unit and the use comfort of a user can be ensured.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more specifically, to a filter assembly, an indoor unit, and an air conditioner. Background Technology

[0002] Air conditioners are widely used for indoor temperature regulation. Existing indoor units typically have filters at the air inlet to filter the airflow entering the duct, reducing the blockage and damage to the duct components caused by impurities and dust, and minimizing their negative impact on heat exchange efficiency. However, existing filters, especially those using adsorption materials to enhance the filtration of impurities and dust, are easily clogged by impurities during use, resulting in low airflow. This affects the indoor unit's efficiency in regulating indoor temperature and reduces user comfort. Summary of the Invention

[0003] The present invention aims to provide a filter assembly, an indoor unit, and an air conditioner to solve the technical problem that existing filters are easily clogged by impurities during use, resulting in low air intake, which in turn affects the indoor unit's temperature regulation efficiency and reduces user comfort.

[0004] To address the aforementioned problems, the present invention provides a filter assembly comprising a filter screen without adsorption function and a frame with adsorption function. The frame includes a frame body that forms an installation port, and the filter screen is fitted into the installation port.

[0005] When the filter assembly provided by this invention is used in an indoor unit, the frame and filter screen of the filter assembly are positioned at the air inlet. Airflow passing through the air inlet must be filtered and adsorbed by the filter assembly before flowing into the housing. Specifically, when airflow passes through the filter assembly, the airflow corresponding to the filter screen area flows through the filter screen. The filter screen can block impurities and dust larger than the filter pores within the airflow, keeping them outside. The relatively clean airflow then flows into the housing through the filter screen's mesh, thereby improving the cleanliness of the airflow, reducing the blockage and contamination caused by impurities and dust in the airflow flowing through the duct, ensuring the normal operation of the duct assembly, and improving user comfort. Simultaneously, the airflow corresponding to the frame area directly collides with the frame. The frame, with its adsorption function, can adsorb impurities and dust within the airflow. The relatively clean airflow, after being adsorbed, then flows into the housing through the filter screen's mesh. The frame assists the filter in adsorbing and filtering impurities and dust in the airflow, thereby improving the filtration effect of the filter assembly and reducing the filtration load on the filter. This reduces the degree of impurity blockage at the filter, extends its service life, and increases its air intake, thus ensuring the indoor unit's temperature regulation effect. Furthermore, during use, since the filter only obstructs and filters airflow without adsorption, impurities and dust blocking the outside of the filter are in relatively active contact with it. The frame surrounding the filter has a better adsorption effect on impurities and dust. Consequently, impurities and dust near the frame can move and adhere to the frame under its adsorption effect, further reducing the degree of filter blockage. While ensuring effective filtration of the airflow by the filter assembly, this further increases the effective air intake of the filter, thereby further improving the indoor unit's temperature regulation efficiency and user comfort.

[0006] Optionally, the framework includes a matrix and the matrix is ​​doped with adsorbent particles;

[0007] Alternatively, the framework may be made of nano-negative ion material or the framework may include a base and a nano-negative ion adsorption layer covering the outer wall of the base;

[0008] Alternatively, the skeleton may be made of activated carbon fiber.

[0009] Optionally, the frame further includes an extension plate, with a first end connected to the outer wall of the frame and a second end extending away from the frame.

[0010] Optionally, the extension plate is provided with vents.

[0011] Optionally, at least one end of the vent hole is a flared section.

[0012] Optionally, the extension plate is provided with grooves and / or protrusions.

[0013] Optionally, the frame includes a rectangular perimeter, multiple first support bars, and multiple second support bars. Two opposing perimeter bars are designated as first perimeter bars, and the other two opposing perimeter bars are designated as second perimeter bars. The multiple first support bars are connected between two first perimeter bars and are spaced apart along the length of the first perimeter bars. The multiple second support bars are connected between two second perimeter bars and are spaced apart along the length of the second perimeter bars.

[0014] Optionally, the frame further includes extension plates, the number of which is equal to the sum of the first support strip and the second frame strip, and the plurality of extension plates are connected one-to-one with the first support strip and the second frame strip.

[0015] Optionally, the second frame strip and the first support strip are arranged at equal intervals along the length direction of the first frame strip, and the arrangement interval is L; the surface of the extension plate is perpendicular to the contour surface enclosed by the frame, and the extension height of the extension plate is H, where H≥1 / 2L.

[0016] The present invention also provides an indoor unit, including a housing and the above-mentioned filter assembly, wherein the housing is provided with an air inlet, and the frame of the filter assembly is connected to the housing and corresponds to the air inlet.

[0017] The present invention also provides an air conditioner, including an outdoor unit and the aforementioned indoor unit, wherein the indoor unit and the outdoor unit are connected by a refrigerant pipe to form a refrigerant circulation.

[0018] The air conditioner provided by this invention uses the aforementioned filter assembly. The filter screen of the filter assembly filters the airflow, and the frame adsorbs and filters impurities and dust mixed in the airflow. This effectively improves the cleanliness of the airflow entering the casing, reduces the blockage and contamination caused by impurities and dust flowing through the air duct and affecting the air duct assembly, ensures the normal operation of the air duct assembly, and improves user comfort. Simultaneously, the frame can also adsorb impurities blocked by the filter screen nearby, effectively reducing the filter load and the degree of blockage. While ensuring effective airflow filtration by the filter assembly, it further increases the effective air intake of the filter screen, thereby further improving the temperature regulation efficiency of the indoor unit and user comfort. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0020] Figure 1 An isometric drawing of the indoor unit provided for this invention;

[0021] Figure 2 Exploded view of the indoor unit provided for this invention;

[0022] Figure 3 A partial cross-sectional view of the filter assembly provided by the present invention when the extension plate is provided with vent holes.

[0023] Explanation of reference numerals in the attached figures:

[0024] 10-Filter assembly; 20-Housing; 21-Air inlet; 100-Filter screen; 200-Frame; 210-Frame body; 211-Mounting port; 212-Enclosure; 212a-First enclosure strip; 212b-Second enclosure strip; 213-First support strip; 214-Second support strip; 220-Extension plate; 221-Ventilation hole; 221a-Flanged hole section; 221b-Straight hole section. Detailed Implementation

[0025] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0026] This embodiment provides a filter component 10, such as Figure 1 and Figure 2 As shown, it includes a filter 100 that does not have an adsorption function and a frame 200 that has an adsorption function. The frame 200 includes a frame 210 that forms an installation port 211, and the filter 100 is matched and disposed in the installation port 211.

[0027] This embodiment also provides an indoor unit, such as... Figure 1 and Figure 2 As shown, the filter assembly includes a housing 20 and the aforementioned filter assembly 10. The housing 20 is provided with an air inlet 21, and the frame 210 of the filter assembly 10 is connected to the housing 20 and corresponds to the air inlet 21.

[0028] The filter assembly 10 and indoor unit provided in this embodiment include a filter screen 100 for filtering impurities and dust in the airflow and a frame 200 for supporting the filter screen 100 and adsorbing impurities and dust in the airflow; the indoor unit includes a housing 20 for forming an internal air duct and the filter assembly 10 for filtering the air inlet 21 of the air duct.

[0029] In use, the frame 210 of the filter assembly 10 and the filter screen 100 are positioned at the air inlet 21. When the airflow passes through the air inlet 21, it needs to be filtered and adsorbed by the filter assembly 10 before flowing into the housing 20. Specifically, when the airflow passes through the filter assembly 10, the airflow corresponding to the area of ​​the filter screen 100 flows through the filter screen 100. The filter screen 100 can block impurities and dust larger than the filter pores in the airflow from entering the housing 20. The relatively clean airflow after filtration flows into the housing 20 through the mesh of the filter screen 100. This improves the cleanliness of the airflow, reduces the blockage and contamination caused by impurities and dust in the airflow as it flows through the duct, ensures the normal operation of the duct components, and enhances user comfort. Simultaneously, the airflow corresponding to the area of ​​the frame 200 directly collides and contacts the frame 200. The frame 200, with its adsorption function, can adsorb impurities and dust mixed in the airflow. The relatively clean airflow, after adsorption, then flows through the mesh of the filter 100 into the housing 20. Thus, the frame 200 can assist in... The auxiliary filter 100 adsorbs and filters impurities and dust in the airflow, thereby improving the filtration effect of the filter assembly 10 and reducing the filtration load of the filter 100. This reduces the degree of impurity blockage at the filter 100, extends its service life, and increases its air intake, thus ensuring the indoor unit's temperature regulation effect on the indoor environment. In addition, during use, since the filter 100 only has a blocking and filtering effect on the airflow and does not have an adsorption effect, the impurities and dust blocking the outside of the filter 100 are in relatively active contact with the filter 100. The frame 210 surrounding the filter 100 has a better adsorption effect on impurities and dust. Accordingly, the impurities and dust in the area of ​​the filter 100 near the frame 210 can move and be adsorbed onto the frame 210 under the adsorption effect of the frame 210, thereby further reducing the degree of blockage of the filter 100. While ensuring the effective filtration of the airflow by the filter assembly 10, the effective air intake of the filter 100 is further increased, which in turn further improves the temperature regulation efficiency of the indoor unit and the user's comfort.

[0030] Specifically, in this embodiment, the framework 200 may include a matrix, and the matrix is ​​doped with adsorbent particles. This is one specific form of the framework 200 with adsorption function. The matrix can be made of a non-adsorbent plastic material, etc., and the matrix is ​​doped with adsorbent particles, such as calcium magnesium silicate particles or other adsorbent particles that adsorb impurities and dust, thereby enabling the entire framework 200 to adsorb impurities and dust. When calcium magnesium silicate particles are selected as the adsorbent particles, they exhibit both physical and chemical adsorption, resulting in better adsorption effects on impurities and dust.

[0031] In addition to directly adding adsorption particles to the existing skeleton 200 material to enable the skeleton 200 to have an adsorption function, in this embodiment, the skeleton 200 can also be made of nano-negative ion material. Specifically, the nano-negative ion material itself can generate negative ions to adsorb impurities and dust. Similarly, the skeleton 200 can also include a base frame and a nano-negative ion adsorption layer covering the outer wall of the base frame. The base frame can be made of plastic material that does not have an adsorption function, and the outer wall of the frame is covered with a nano-negative ion adsorption layer that has an adsorption function, so that the entire skeleton 200 has an adsorption function for impurities and dust.

[0032] In addition, the skeleton 200 can also be made of activated carbon fiber. Activated carbon fiber has a large specific surface area and can adsorb surrounding impurities and dust through van der Waals forces.

[0033] Of course, in other embodiments, the skeleton 200 may also take any other form that can adsorb impurities and dust.

[0034] Specifically, in this embodiment, as Figure 1 and Figure 2As shown, the frame 210 includes a rectangular frame 212, multiple first support bars 213 and multiple second support bars 214. Two opposing frame bars of the frame 212 are first frame bars 212a and the other two opposing frame bars are second frame bars 212b. The multiple first support bars 213 are all connected between two first frame bars 212a and are arranged at intervals along the length direction of the first frame bars 212a. The multiple second support bars 214 are all connected between two second frame bars 212b and are arranged at intervals along the length direction of the second frame bars 212b. The entire frame 210 is a regularly shaped rectangular grid. Adjacent first support bars 213, second support bars 214, first frame bars 212a, and second frame bars 212b together form multiple mounting openings 211, each equipped with a filter screen 100. This configuration of the frame 210 facilitates shape accuracy during processing, thereby improving processing convenience. Specifically, the frame 212, first support bars 213, and second support bars 214 can be integrally formed, with the intersection of the first support bars 213 and second support bars 214 being integral, further enhancing the processing convenience of the frame 210 and ensuring the integrity of the frame 212, first support bars 213, and second support bars 214. The connection firmness of the second support bar 214 and its load-bearing strength on the filter screen 100; on the other hand, the frame 212 surrounds the filter screen 100, and the first support bar 213 and the second support bar 214 are distributed crosswise in various areas of the filter screen 100. In use, the frame 212, the first support bar 213 and the second support bar 214 can adsorb impurities and dust on the filter screen 100 in their vicinity, and can comprehensively adsorb multiple areas of the filter screen 100, thereby comprehensively adsorbing dust and reducing blockage in all areas of the filter screen 100, so that the air intake of all areas of the filter screen 100 is better, reducing the occurrence of severe local blockage of the filter screen 100 that prevents ventilation and reduces its air intake.

[0035] Optionally, in this embodiment, as Figure 1 and Figure 2As shown, the frame 200 may also include an extension plate 220, with a first end of the extension plate 220 connected to the outer wall of the frame 210 and a second end extending away from the frame 210. When the frame is installed at the air inlet 21, it is approximately parallel to the air inlet 21. The first end of the extension plate 220 is connected to the frame 210 and is arranged opposite to the air inlet 21 on the outside of the air inlet 21 and the frame 210. Thus, the first end of the extension plate 220 will not cause additional obstruction to the filter 100. At the same time, the extension plate 220 will not cause significant obstruction to the air inlet 21, thereby ensuring the effective air intake area of ​​the air inlet 21 and correspondingly ensuring its air intake volume. When the indoor unit is running, the airflow converges around the air inlet 21. The airflow in the area where the extension plate 220 is located can collide and contact with the plate surface of the extension plate 220. The extension plate 220, which has an adsorption effect, can adsorb impurities and dust mixed in the airflow. The relatively clean airflow after adsorption continues to flow to the air inlet 21 under the guidance of the extension plate 220, and continues to undergo secondary filtration treatment by the frame 210 and the filter 100 before flowing into the housing 20 through the air inlet 21. The extension plate 220, while ensuring the area of ​​the filter screen 100 of the filter assembly 10 and the effective air intake area of ​​the air inlet 21, can effectively increase the adsorption area of ​​the frame 200, thereby improving its adsorption effect on impurities and dust in the airflow. Moreover, the adsorption process of impurities and dust by the extension plate 220 is located upstream of the filter screen 100, which further reduces the filtration load of the filter screen 100 and the degree of clogging, thereby further increasing the air intake of the filter screen 100 and ensuring the indoor unit's temperature regulation effect on the indoor environment.

[0036] In addition, the extension plate 220, the frame 210 and the filter screen 100 form an integral component. When cleaning is required, the entire filter assembly 10 can be directly removed and cleaned. Correspondingly, the entire filter assembly 10 can be installed, and the disassembly, assembly and cleaning are both highly convenient.

[0037] Specifically, in this embodiment, as Figure 1 and Figure 2 As shown, the number of extension plates 220 can be equal to the sum of the first support strip 213 and the second frame strip 212b, and multiple extension plates 220 are connected one-to-one with the first support strip 213 and the second frame strip 212b. The two second frame strips 212b and multiple first support strips 213 are parallel to each other and spaced apart along the length direction of the first frame strip 212a. Correspondingly, multiple extension plates 220 are spaced apart along the length direction of the first frame strip 212a; as shown... Figure 1As shown in the view, the air inlet 21 is located at the top of the housing 20, the frame 210 is connected to the air inlet 21, and the extension plate 220 is located on the upper side of the frame 210 and extends upward away from the frame 210. Thus, each pair of adjacent extension plates 220 forms a channel with openings at both ends and the top. The airflow can flow through the openings to the space between the two extension plates 220 and then to the filter 100 and the second support bar 214. Specifically, the airflow can fully contact the surface of the extension plate 220 as it flows into the channel through the openings. Correspondingly, the surface of the extension plate 220 can effectively adsorb impurities and dust in the airflow. After being adsorbed by the extension plate 220 in sequence, the airflow only needs to flow to the corresponding filter 100 and the first support bar 213. After secondary filtration, it enters the housing 20 through the air inlet 21. The arrangement of the aforementioned extension plates 220 is neat, forming a channel that is orderly and has a large opening area. This reduces the disturbance to the airflow caused by the staggered arrangement of the extension plates 220, as well as the noise pollution caused by the airflow disturbance to the frame and filter screen 100, which in turn raises the impurities and dust filtered by the filter screen 100. Accordingly, while ensuring the effective adsorption of impurities and dust in the airflow, the stability of the airflow is improved, noise pollution is reduced, and user comfort is improved.

[0038] Of course, in other embodiments, the air inlet 21 may also be located on the back plate or side plate of the housing 20. Figure 1 This is merely an illustrative example and is not intended to be limiting; similarly, the first support bar 213 is... Figure 1 The first support bar 213 extends along the width direction of the frame 212. In other embodiments, the first support bar 213 may also extend along the length direction of the frame 212.

[0039] In this embodiment, as Figure 1 and Figure 2 As shown, the second frame strip 212b and the first support strip 213 are arranged at equal intervals along the length of the first frame strip 212a, with an interval of L; the surface of the extension plate 220 is perpendicular to the contour surface enclosed by the frame 210, and the extension height of the extension plate 220 is H, where H ≥ 1 / 2L. It should be noted that the extension trend of the frame 210 is consistent with that of the air inlet 21, such as... Figure 1 As shown, the air inlet 21 includes a flat area at the top and an arc-shaped area at the corner. The outline of the frame 210, which is consistent with the air inlet 21, also includes a flat area and an arc-shaped area. The angle between the surface of the extension plate 220 and the outline formed by the frame 210 is within the range of 85° to 90°, indicating that they are perpendicular to each other. Figure 1As shown, the extension plate 220 extends vertically upwards with an extension height of H. Each extension plate 220 is arranged in parallel with equal spacing in the left-right direction, and the distance between each two adjacent extension plates 220 is L, where H ≥ 1 / 2L. The extension plates 220 are relatively high, and the total area of ​​the extension plates 220 on both sides of each channel is not less than the area of ​​the filter screen 100 of that channel. Therefore, the airflow along the surface of the extension plate 220, which is approximately perpendicular to the plate surface, can flow upwards and then turn downwards under the guiding effect of the extension plate 220. The downward-flowing airflow can first flow to the surface of the adjacent extension plate 220, and after being adsorbed by the plate surface, it flows downwards to the filter screen 100 under its guiding effect, and then flows into the housing 20 through the air inlet 21. This improves the adsorption capacity of the extension plate 220 for the airflow, thereby further improving the filtration effect of the filter assembly 10 on impurities and dust in the airflow, and further reducing the filtration load of the filter screen 100 and alleviating its clogging degree.

[0040] Specifically, when the air inlet 21 is located at the top of the wall-mounted indoor unit housing 20, H < 100mm, in order to meet the installation requirements of the wall-mounted indoor unit and the space for disassembling and assembling the filter assembly 10.

[0041] Optionally, in this embodiment, as Figure 2 and Figure 3 As shown, the extension plate 220 can be provided with ventilation holes 221. During use, on the one hand, the ventilation holes 221 can increase the surface area of ​​the extension plate 220. The airflow flowing towards the extension plate 220 can not only be adsorbed and filtered by the plate surface of the extension plate 220, but also flow towards the air inlet 21 through the ventilation holes 221. During the flow, it is adsorbed and filtered by the hole wall surface of the ventilation holes 221, thereby further improving the filtration effect of the extension plate 220 and the filter assembly 10 on airflow impurities and dust. On the other hand, the airflow towards the extension plate 220 can flow towards the air inlet 21 through the ventilation holes 221, thereby enhancing the airflow of the extension plate 220, correspondingly reducing the obstruction of the airflow caused by the extension plate 220, improving the airflow, and thus improving the overall air intake and temperature regulation effect of the indoor unit.

[0042] Specifically, in this embodiment, at least one end of the vent 221 has a flared section 221a. The flared section 221a not only increases the wall area of ​​the vent 221, correspondingly increasing the adsorption surface area of ​​the extension plate 220, further improving its adsorption and filtration effect on impurities and dust in the airflow; when the vent 221 is blocked by impurities, the larger flared area at the outer end of the flared section 221a makes it easier to clean the impurities inside, thereby improving the ease of cleaning the vent 221. Specifically, as... Figure 3As shown, both ends of the vent 221 are flared hole sections 221a, and a straight hole section 221b can be left between the two flared hole sections 221a. Preferably, the vent 221 only includes two flared hole sections 221a to further improve its cleaning convenience.

[0043] In addition to increasing the adsorption area of ​​the extension plate 220 by setting the ventilation hole 221 as described above, in this embodiment, at least one of grooves and protrusions can also be set on the surface of the extension plate 220.

[0044] This embodiment also provides an air conditioner, including an outdoor unit and the aforementioned indoor unit, which are connected by refrigerant pipes to form a refrigerant circulation. The indoor unit of this air conditioner uses the aforementioned filter assembly 10, wherein the filter screen 100 of the filter assembly 10 can filter the airflow, and the frame 200 can adsorb and filter impurities and dust mixed in the airflow, thereby effectively improving the cleanliness of the airflow flowing into the housing 20, reducing the blockage and contamination caused by impurities and dust in the airflow through the duct, ensuring the normal operation of the duct assembly, and improving user comfort. Simultaneously, the frame 200 can also adsorb impurities blocked by the filter screen 100 nearby, thereby effectively reducing the filtration load of the filter screen 100 and reducing the degree of blockage. While ensuring effective filtration of the airflow by the filter assembly 10, it further increases the effective air intake of the filter screen 100, correspondingly further improving the temperature regulation efficiency of the indoor unit and user comfort.

[0045] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0046] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A filter assembly, characterized in that, The filter includes a non-adsorption filter (100) and an adsorption frame (200). The frame (200) includes a frame (210) and an extension plate (220). The frame (210) forms an installation opening (211), and the filter (100) is fitted into the installation opening (211). The first end of the extension plate (220) is connected to the outer wall of the frame (210), and the second end extends away from the frame (210). The extension plate (220) is provided with a vent hole (221).

2. The filter assembly according to claim 1, characterized in that, The framework (200) includes a matrix and the matrix is ​​doped with adsorbent particles; Alternatively, the framework (200) is made of nano-negative ion material; or, the framework (200) includes a base and a nano-negative ion adsorption layer covering the outer wall of the base; Alternatively, the skeleton (200) may be made of activated carbon fiber.

3. The filter assembly according to claim 1, characterized in that, At least one end of the vent (221) has a flared section (221a).

4. The filter assembly according to claim 1, characterized in that, The extension plate (220) is provided with grooves and / or protrusions.

5. The filter assembly according to claim 1 or 2, characterized in that, The frame (210) includes a rectangular frame (212), multiple first support bars (213) and multiple second support bars (214). Two opposing frame bars of the frame (212) are first frame bars (212a) and the other two opposing frame bars are second frame bars (212b). The multiple first support bars (213) are connected between two first frame bars (212a) and are spaced apart along the length direction of the first frame bars (212a). The multiple second support bars (214) are connected between two second frame bars (212b) and are spaced apart along the length direction of the second frame bars (212b).

6. The filter assembly according to claim 5, characterized in that, The number of extension plates (220) is equal to the sum of the first support strip (213) and the second frame strip (212b), and the plurality of extension plates (220) are connected one-to-one with the first support strip (213) and the second frame strip (212b).

7. The filter assembly according to claim 6, characterized in that, The second frame strip (212b) and the first support strip (213) are arranged at equal intervals along the length direction of the first frame strip (212a), and the arrangement interval is L; the plate surface of the extension plate (220) is perpendicular to the contour surface enclosed by the frame (210), and the extension height of the extension plate (220) is H, where H≥1 / 2L.

8. An indoor unit, characterized in that, Includes a housing (20) and a filter assembly (10) according to any one of claims 1-7, wherein the housing (20) is provided with an air inlet (21), and the frame (210) of the filter assembly (10) is connected to the housing (20) and corresponds to the air inlet (21).

9. An air conditioner, characterized in that, It includes an outdoor unit and an indoor unit as described in claim 8, wherein the indoor unit and the outdoor unit are connected by a refrigerant pipe to form a refrigerant circulation.

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