Air conditioning unit and purifying and preheating assembly thereof

Abstract

The purifying and preheating assembly of the air conditioning unit comprises a frame body, a filter screen assembly, an electric heating assembly and a temperature control assembly, the frame body is used for being assembled in the air conditioning unit, an air inlet duct is formed by the frame body in a surrounding mode, and the air inlet duct is provided with an air inlet and an air outlet; a mounting opening is formed in one side of the frame body, the mounting opening communicates with the air inlet duct, and a blocking piece is movably arranged at the mounting opening; and the filter screen assembly is detachably mounted in the air inlet duct from the mounting opening. Compared with the prior art, the purifying and preheating assembly of the air conditioning unit can adopt a built-in installation design, so that the air leakage condition is reduced or avoided, and the filter screen is convenient to replace and clean; and a preheating assembly is additionally arranged, so that normal operation and performance exertion of other assemblies in the air conditioning unit can be ensured in northern areas which are cold throughout the year in winter.

Description

TECHNICAL FIELD

[0001] The utility model relates to air treatment technical field, concretely relates to an air conditioning unit and its purification preheating subassembly. BACKGROUND

[0002] The combined air conditioning unit is an air treatment equipment assembled by various air treatment function segments, and the air treatment function segments of the unit have at least multiple units of air mixing, flow equalization, filtering, cooling, primary and secondary heating, dehumidification, humidification, air supply fan, return air fan, water spraying, noise elimination, heat recovery and the like.

[0003] The filter screen is usually designed at the fresh air outlet of the air conditioning unit, but the filter screen at the fresh air outlet is usually installed in an external manner, that is, a through groove is formed on the connecting flange protruding outward on the outside of the air conditioning unit, and the filter screen is inserted into the through groove. In order to facilitate the disassembly and assembly of the filter screen, the through groove needs to be connected to the inside and outside of the connecting flange, and the fresh air outlet is in the connecting flange. When the fresh air passes through the connecting flange, some fresh air will leak out of the through groove to the outside of the connecting flange, and then the fresh air will leak out to the outside of the air conditioning unit. The leaked air is easy to blow the environment near the air conditioning unit and produce noise, and other situations that may affect the user experience may occur. SUMMARY

[0004] The utility model aims at overcoming the shortcomings and deficiencies in the prior art, and provides an air conditioning unit and a purification preheating subassembly thereof.

[0005] One embodiment of the utility model provides a purification preheating subassembly of an air conditioning unit, which comprises:

[0006] A frame body is used for assembling in the inside of the air conditioning unit, the frame body is surrounded by an air inlet duct, the air inlet duct has an air inlet and an air outlet, the air inlet of the air inlet duct is used for communicating with the fresh air outlet of the air conditioning unit, one side of the frame body is provided with a mounting port, the mounting port communicates with the air inlet duct, and a blocking piece is movably arranged at the mounting port;

[0007] A filter screen assembly is detachably mounted into the air inlet duct from the mounting port, and the blocking piece is limited in position with the filter screen assembly to limit the filter screen assembly in the air inlet duct;

[0008] An electric heating assembly is arranged at the air outlet of the air inlet duct;

[0009] A temperature control assembly is arranged on the side of the electric heating assembly away from the air inlet duct and is signal connected with the electric heating assembly.

[0010] In some optional embodiments, the air inlet duct is provided with an upper guide rail and a lower guide rail, both of which extend towards the installation opening, the top of the filter screen assembly is in sliding fit with the upper guide rail, and the bottom of the filter screen assembly is in sliding fit with the lower guide rail.

[0011] In some optional embodiments, the upper guide rail and the lower guide rail are provided with wind blocking strips on the side of the filter screen assembly facing the air inlet.

[0012] In some optional embodiments, the blocking piece is detachably connected with the frame body through a threaded structure or a buckle structure.

[0013] In some optional embodiments, the outer side of the frame body is provided with a first installation portion arranged around the air inlet and a second installation portion arranged around the air outlet, the first installation portion is used for being connected with the inner wall of a purification preheating assembly of an air conditioning unit, and the electric heating assembly and the temperature control assembly are assembled on the second installation portion.

[0014] In some optional embodiments, the frame body comprises two horizontal frames and two vertical frames, and the two horizontal frames and the two vertical frames surround to form the frame body.

[0015] The side of the horizontal frame facing the air inlet and the side of the vertical frame facing the air inlet are both provided with a first flange, the first flanges of the horizontal frame and the vertical frame surround to form the first installation portion, and the side of the horizontal frame facing the air outlet and / or the side of the vertical frame facing the air outlet are provided with a second flange, and the second flange surrounds to form the second installation portion.

[0016] In some optional embodiments, the temperature control assembly is installed on the frame body through an overheat protection fixing piece, the overheat protection fixing piece comprises an extension portion and a fixing portion, the extension portion extends from the side of the frame body with the air outlet, the fixing portion extends towards the middle part of the air outlet along the radial position of the air outlet, the temperature control assembly is arranged on the fixing portion and has a preset spacing with the electric heating assembly.

[0017] Another embodiment of the utility model provides an air conditioning unit, which comprises a body and a purification preheating assembly as described above, the body is provided with a fresh air inlet, the frame body is arranged in the body, and the air inlet of the air inlet duct is communicated with the fresh air inlet.

[0018] In some optional embodiments, one side of the body is provided with an inspection opening and an inspection door for opening and closing the inspection opening, and the installation opening faces the inspection opening.

[0019] In some optional embodiments, the body is formed with a mixing section, a fan section, a flow equalizing section, a filtering section, an air treatment section and a air supply section in sequence, the mixing section is provided with the return air inlet and the fresh air inlet, the fan section is provided with a fan, the filtering section is provided with a filter, the air treatment section is provided with a refrigeration assembly and / or a heating assembly and / or a humidifying assembly, and the air supply section is provided with an air supply outlet.

[0020] The frame body is mounted on the inner wall of the mixing section.

[0021] Compared with the prior art, the purification and preheating assembly of the air conditioning unit can be designed in an embedded manner, so that air leakage is reduced or avoided, the filter screen is convenient to replace and clean, and in addition, the preheating assembly is additionally arranged, so that the other components in the air conditioning unit can be ensured to normally operate and perform in the northern region with severe cold in winter.

[0022] In order to more clearly understand the present application, the specific embodiments of the present application will be described below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 FIG. 1 is a structural schematic view of an air conditioning unit according to an embodiment of the present application;

[0024] Figure 2 FIG. 2 is an exploded view of the air conditioning unit according to the embodiment of the present application;

[0025] Figure 3 FIG. 3 is a structural schematic view of one side of a purification and preheating assembly of the air conditioning unit according to the embodiment of the present application;

[0026] Figure 4 FIG. 4 is a structural schematic view of the other side of the purification and preheating assembly of the air conditioning unit according to the embodiment of the present application;

[0027] Figure 5 FIG. 5 is a sectional view of the air conditioning unit according to the embodiment of the present application;

[0028] Figure 6 FIG. 6 is an exploded view of the purification and preheating assembly of the air conditioning unit according to the embodiment of the present application.

[0029] BRIEF DESCRIPTION OF DRAWINGS

[0030] 10, body; 11, fresh air inlet; 12, access hole; 13, access door; 14, mixing section; 141, return air inlet; 15, fan section; 16, flow equalizing section; 17, filtering section; 18, air treatment section; 19, air supply section; 191, air supply outlet; 20, frame; 21, air inlet duct; 211, air inlet; 212, air outlet; 213, upper guide rail; 214, lower guide rail; 215, air baffle; 22, mounting hole; 221, fixing hole; 23, blocking piece; 24, first mounting portion; 25, second mounting portion; 26, horizontal frame; 261, first flange; 262, first mounting lug; 27, vertical frame; 271, second flange; 272, second mounting lug; 28, overheat protection fixing piece; 281, extension; 282, fixing portion; 30, filter screen assembly; 40, electric heating assembly; 50, temperature control assembly. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application. In the description of the present application, unless otherwise specified, "a plurality of" means 2 or more than 2, and "several" means 1 or more than 1. In addition, unless otherwise specified, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0032] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "straight", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0033] In the description of the present application, unless otherwise specified and limited, the terms "mounting", "connection", "connecting", "fixing" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] In the description of this utility model, references to terms such as "one embodiment," "some alternative implementations," or "some optional embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0035] Please see Figures 1 to 4 Another embodiment of the present invention provides an air conditioning unit, including: a main body 10 and a purification and preheating component of an air conditioning unit as described above, wherein a fresh air inlet 11 is provided on the main body 10.

[0036] The purification and preheating components of the air conditioning unit include: a frame 20, a filter assembly 30, an electric heating assembly 40, and a temperature control assembly 50.

[0037] The frame 20 is used to assemble inside the air conditioning unit. The frame 20 surrounds an air inlet duct 21, which is located inside the main body 10. The air inlet duct 21 has an air inlet 211 and an air outlet 212. The air inlet 211 of the air inlet duct 21 is connected to the fresh air inlet 11 of the air conditioning unit, and the air outlet 212 is connected to the interior of the main body 10. An installation port 22 is provided on one side of the frame 20, which is connected to the air inlet duct 21. A blocking member 23 is movably provided at the installation port 22. The frame 20 is located inside the main body 10, and the air inlet 211 of the air inlet duct 21 is connected to the fresh air inlet 11.

[0038] The filter assembly 30 is detachably installed into the air intake duct 21 through the mounting port 22. The blocking member 23 engages with the filter assembly 30 to confine it within the air intake duct 21. The filter assembly 30 filters dust particles in the fresh air, making the air entering the room cleaner. By removing the blocking member 23 from the mounting port 22, the filter assembly 30 can be removed from the mounting port 22 for replacement or cleaning. Alternatively, the filter assembly 30 can be inserted into the air intake duct 21 from the mounting port 22, making the operation convenient. In this embodiment, a fixing port 221 is also provided in the air intake duct 21. The fixing port 221 and the mounting port 22 are located on both sides of the air intake duct 21, respectively. After the filter assembly 30 is installed, both sides of the filter assembly 30 are located within the fixing port 221 and the mounting port 22, respectively. The fixing port 221 and the mounting port 22 position the filter assembly 30, improving the assembly stability of the filter assembly 30 and reducing noise.

[0039] The filter assembly 30 may use a primary or medium-efficiency filter.

[0040] The electric heating assembly 40 is arranged at the air outlet 212 of the air inlet air duct 21, and is used for preheating the fresh air. In the northern region with severe winter, the temperature of the fresh air entering the body 10 of the air conditioning unit is relatively low, so that the components in the body 10 cannot normally operate due to the temperature reduction. The preheating of the fresh air can heat the fresh air to a temperature suitable for the normal operation and performance of the other components in the air conditioning unit.

[0041] The temperature control assembly 50 is arranged on the side of the electric heating assembly 40 away from the air inlet air duct 21, and is signal connected with the electric heating assembly 40. The temperature control assembly 50 is used for detecting the temperature of the fresh air heated by the electric heating assembly 40, so as to avoid the situation that the heating temperature is too high. In the embodiment, the temperature control assembly 50 adopts a 75℃ resettable normally closed temperature controller. When the temperature of the fresh air heated by the electric heating assembly 40 exceeds 75℃, the temperature control assembly 50 will trigger and send a signal to the electric heating assembly 40. The electric heating assembly 40 stops heating after receiving the signal, so as to avoid the overheating situation.

[0042] In the utility model, the purification and preheating assembly of the air conditioning unit is arranged in the body 10. Even if the airflow in the air inlet air duct 21 leaks from the installation port 22, the leaked airflow is still in the body 10. Therefore, the situation that the air leaks to the outside of the body 10 is reduced or avoided, and the user experience is improved.

[0043] In some optional embodiments, the body 10 is provided with an access opening 12 and an access door 13 for opening and closing the access opening 12. After the access door 13 opens the access opening 12, the user can enter the body 10 to maintain, replace and clean the filter screen assembly 30 and other components in the body 10. The installation port 22 is towards the access opening 12, which is convenient for the user to operate. The access door 13 can be detachably fixed on the body 10 through screws or buckles, so as to facilitate the opening and closing of the access opening 12 by the access door 13. Alternatively, the access door 13 can open and close the access opening 12 by sliding or rotating.

[0044] Please refer to Figure 5In some optional embodiments, the body 10 is formed with a mixing section 14, a fan section 15, a flow equalization section 16, a filtering section 17, an air treatment section 18 and an air supply section 19 in sequence, the mixing section 14 is provided with an air return port 141, a fresh air port 11 and a maintenance port 12, the fan section 15 is provided with a fan, the filtering section 17 is provided with a filter, the air treatment section 18 is provided with a refrigeration assembly and / or a heating assembly and / or a humidifying assembly, and the air supply section 19 is provided with an air supply port 191; the frame 20 is arranged in the mixing section 14 and mounted on the inner wall of the mixing section 14. The fresh air port 11 is in communication with the outdoor, the air return port 141 and the air supply port 191 are in communication with the indoor, the air flow enters the mixing section 14 from the fresh air port 11 and the air return port 141, mixes, sequentially passes through the fan section 15, the flow equalization section 16, the filtering section 17, the air treatment section 18 and the air supply section 19, and then is blown out from the air supply port 191. The filter can adopt a primary and medium efficiency filter screen, the refrigeration assembly is used for cooling air to achieve cooling, which can adopt a surface cooler and other assemblies, and can also intercept moisture in the air to achieve dehumidification function; the heating assembly is used for heating air to achieve cooling; the humidifying assembly is used for spraying water mist to air to achieve humidification function.

[0045] Please refer to Figure 6 In order to improve the assembly stability and convenience of the filter screen assembly 30, in some optional embodiments, the air inlet duct 21 is provided with an upper guide rail 213 and a lower guide rail 214, the upper guide rail 213 and the lower guide rail 214 both extend towards the mounting port 22, the top of the filter screen assembly 30 is in sliding fit with the upper guide rail 213, and the bottom of the filter screen assembly 30 is in sliding fit with the lower guide rail 214; when the filter screen assembly 30 is installed, the filter screen assembly 30 is inserted into the air inlet duct 21 from the mounting port 22 and is in sliding fit with the upper guide rail 213 and the lower guide rail 214, the upper guide rail 213 and the lower guide rail 214 can guide the filter screen assembly 30 to move to a suitable position, and when the filter screen assembly 30 is disassembled, the upper guide rail 213 and the lower guide rail 214 can also guide the filter screen assembly 30 to move outwards from the mounting port 22, thereby improving the disassembly and assembly convenience of the filter screen assembly 30.

[0046] In some optional embodiments, the upper guide rail 213 and the lower guide rail 214 are provided with a wind blocking strip 215, the wind blocking strip 215 is located on the side of the filter screen assembly 30 facing the air inlet port 211; since the filter screen assembly 30 usually includes a frame and a filter screen in the frame, the wind blocking strip 215 can block the side of the frame facing the air inlet port 211, so that the air flow flows to the filter screen, thereby improving the filtering effect. In the present embodiment, the parts of the frame located at the top and bottom of the filter screen are both blocked by the wind blocking strip 215, while the parts of the frame located at the left and right sides of the filter screen extend into the mounting port 22 and the fixing port 221, so that the air flow blows to the filter screen and does not blow to the frame, which is conducive to improving the filtering effect.

[0047] A blocking piece 23 is movably arranged at the mounting port 22, so that the blocking piece 23 can be fixed at the mounting port 22 to limit the filter screen assembly 30 or be separated from the mounting port 22 to enable the filter screen assembly 30 to pass through the mounting port 22. In some optional embodiments, the blocking piece 23 is detachably connected with the frame 20 through a threaded structure or a buckle structure, so as to be fixed at the mounting port 22 or be separated from the mounting port 22. In the embodiment, the blocking piece 23 is detachably locked at the side of the frame 20 through a screw. Of course, in other embodiments, the blocking piece 23 can be rotationally matched with the frame 20 through a rotating shaft, or the blocking piece 23 can be moved to the mounting port 22 or be separated from the mounting port 22 by sliding relative to the frame 20, which is not limited thereto.

[0048] In some optional embodiments, the outer side of the frame 20 is provided with a first mounting portion 24 arranged around the air inlet 211 and a second mounting portion 25 arranged around the air outlet 212. The first mounting portion 24 is connected with the air conditioning unit, and the electric heating assembly 40 and the temperature control assembly 50 are assembled on the second mounting portion 25.

[0049] In the embodiment, the first mounting portion 24 is detachably locked on the inner wall of the mixing section 14 through a plurality of screws, which facilitates the assembly and subsequent maintenance and replacement of the frame 20, which is not limited thereto.

[0050] The specific structure of the electric heating assembly 40 can be selected according to actual needs, for example, the electric heating assembly 40 can include a plurality of PTC heaters arranged in an array along a direction perpendicular to the air flow in the air inlet duct 21 at the air outlet 212. The PTC heaters are detachably locked on the second mounting portion 25 through a plurality of screws, which facilitates the production assembly and subsequent maintenance and replacement, which is not limited thereto.

[0051] In order to facilitate the formation of the frame 20, the first mounting portion 24 and the second mounting portion 25, etc., in some optional embodiments, the frame 20 includes two horizontal frames 26 and two vertical frames 27, which surround the frame 20. The side of the horizontal frame 26 facing the air inlet 211 and the side of the vertical frame 27 facing the air inlet 211 are provided with a first flange 261. The first flange 261 of the horizontal frame 26 and the first flange 261 of the vertical frame 27 surround the first mounting portion 24. The side of the horizontal frame 26 facing the air outlet 212 and / or the side of the vertical frame 27 facing the air outlet 212 are provided with a second flange 271, and the second flange 271 surrounds the second mounting portion 25.

[0052] In the embodiment, the second flange 271 is arranged on the side of the vertical frame 27 facing the air outlet 212, the second flanges 271 of the two vertical frames 27 form the second mounting portion 25, and the two ends of the PTC heater are locked on the two second flanges 271 by screws; the two horizontal frames 26 are arranged between the two vertical frames 27, and the side of the horizontal frame 26 facing the air outlet 212 is further provided with a plurality of first mounting ears 262, the first mounting ears 262 are detachably mounted on the second flange 271 of the vertical frame 27 by screws, and a plurality of second mounting ears 272 are arranged on the first flange 261 of the vertical frame 27, the second mounting ears 272 are detachably mounted on the horizontal frame 26 by screws, thereby facilitating the production and assembly of the frame body 20.

[0053] In some optional embodiments, the temperature control assembly 50 is mounted on the frame body 20 through the overheat protection fixing member 28, the overheat protection fixing member 28 comprises an extension portion 281 and a fixing portion 282, the extension portion 281 extends from the side of the frame body 20 having the air outlet 212, the fixing portion 282 extends towards the middle part of the air outlet 212 along the radial position of the air outlet 212, the temperature control assembly 50 is arranged on the fixing portion 282 and has a preset interval with the electric heating assembly 40; the fixing portion 282 extends towards the middle position of the air outlet 212, the temperature control assembly 50 is arranged at the position close to the middle part of the air outlet 212, so that the heated air can blow on the temperature control assembly 50, which is beneficial to improve the detection accuracy; the extension portion 281 is used for keeping the temperature control assembly 50 at a preset interval relative to the electric heating assembly 40, and the preset interval is used for keeping the temperature control assembly 50 at a proper distance from the electric heating assembly 40, so as to avoid that the temperature control assembly 50 is too close to the electric heating assembly 40 and affects the detection sensitivity.

[0054] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A purification preheating assembly for an air conditioning unit, comprising: The frame is arranged in the air conditioning unit, and the frame surrounds an air inlet duct having an air inlet and an air outlet, the air inlet of the air inlet duct is arranged to communicate with a fresh air inlet of the air conditioning unit, one side of the frame is provided with a mounting opening, the mounting opening is in communication with the air inlet duct, and a blocking piece is movably arranged at the mounting opening. A filter screen assembly is detachably mounted into the air inlet duct from the mounting opening, and the blocking piece is limitedly matched with the filter screen assembly to limit the filter screen assembly in the air inlet duct. An electric heating assembly is arranged at the air outlet of the air inlet duct. A temperature control assembly is arranged on the side of the electric heating assembly away from the air inlet duct and is signal connected with the electric heating assembly. An upper guide rail and a lower guide rail are arranged in the air inlet duct, and the upper guide rail and the lower guide rail both extend towards the mounting opening, the top of the filter screen assembly is slidably matched with the upper guide rail, and the bottom of the filter screen assembly is slidably matched with the lower guide rail.

2. The purification and preheating assembly of an air conditioning unit according to claim 1, characterized in that: The upper guide rail and the lower guide rail are provided with air blocking strips located on the side of the filter screen assembly facing the air inlet.

3. The purification and preheating assembly of an air conditioning unit according to claim 2, characterized in that: The blocking piece is detachably connected with the frame through a threaded structure or a buckle structure.

4. The purification and preheating assembly of an air conditioning unit of claim 1, wherein: The outer side of the frame is provided with a first mounting portion arranged around the air inlet and a second mounting portion arranged around the air outlet, the first mounting portion is used to be connected with the inner wall of the purification and preheating assembly of the air conditioning unit, and the electric heating assembly and the temperature control assembly are assembled on the second mounting portion.

5. A purification preheating assembly for an air handling unit as set forth in any of claims 1-4, further comprising: The frame comprises two horizontal frames and two vertical frames, and the two horizontal frames and the two vertical frames surround the frame.

6. The purification preheat assembly of claim 5, wherein: The side of the horizontal frame facing the air inlet and the side of the vertical frame facing the air inlet are both provided with a first flange, the first flange of the horizontal frame and the first flange of the vertical frame surround the first mounting portion, the side of the horizontal frame facing the air outlet and / or the side of the vertical frame facing the air outlet are provided with a second flange, and the second flange surrounds the second mounting portion. The temperature control assembly is installed on the frame through an overheat protection fixing piece, the overheat protection fixing piece comprises an extension part and a fixing part, the extension part extends from the side of the frame having the air outlet, the fixing part extends towards the middle part of the air outlet along the radial position of the air outlet, the temperature control assembly is arranged on the fixing part and has a preset distance between the temperature control assembly and the electric heating assembly.

7. A purge preheat assembly for an air conditioning unit as set forth in any of claims 1-4, further comprising: The frame is arranged in the air conditioning unit, and the frame surrounds an air inlet duct having an air inlet and an air outlet, the air inlet of the air inlet duct is arranged to communicate with a fresh air inlet of the air conditioning unit, one side of the frame is provided with a mounting opening, the mounting opening is in communication with the air inlet duct, and a blocking piece is movably arranged at the mounting opening.

8. An air conditioning unit characterized by, A filter screen assembly is detachably mounted into the air inlet duct from the mounting opening, and the blocking piece is limitedly matched with the filter screen assembly to limit the filter screen assembly in the air inlet duct. An electric heating assembly is arranged at the air outlet of the air inlet duct.

9. An air conditioning unit as set forth in claim 8 further characterized by: A temperature control assembly is arranged on the side of the electric heating assembly away from the air inlet duct and is signal connected with the electric heating assembly. An upper guide rail and a lower guide rail are arranged in the air inlet duct, and the upper guide rail and the lower guide rail both extend towards the mounting opening, the top of the filter screen assembly is slidably matched with the upper guide rail, and the bottom of the filter screen assembly is slidably matched with the lower guide rail. The upper guide rail and the lower guide rail are provided with air blocking strips located on the side of the filter screen assembly facing the air inlet. The blocking piece is detachably connected with the frame through a threaded structure or a buckle structure. The outer side of the frame is provided with a first mounting portion arranged around the air inlet and a second mounting portion arranged around the air outlet, the first mounting portion is used to be connected with the inner wall of the purification and preheating assembly of the air conditioning unit, and the electric heating assembly and the temperature control assembly are assembled on the second mounting portion. The frame comprises two horizontal frames and two vertical frames, and the two horizontal frames and the two vertical frames surround the frame. The side of the horizontal frame facing the air inlet and the side of the vertical frame facing the air inlet are both provided with a first flange, the first flange of the horizontal frame and the first flange of the vertical frame surround the first mounting portion, the side of the horizontal frame facing the air outlet and / or the side of the vertical frame facing the air outlet are provided with a second flange, and the second flange surrounds the second mounting portion. The temperature control assembly is installed on the frame through an overheat protection fixing piece, the overheat protection fixing piece comprises an extension part and a fixing part, the extension part extends from the side of the frame having the air outlet, the fixing part extends towards the middle part of the air outlet along the radial position of the air outlet, the temperature control assembly is arranged on the fixing part and has a preset distance between the temperature control assembly and the electric heating assembly. The frame is arranged in the air conditioning unit, and the frame surrounds an air inlet duct having an air inlet and an air outlet, the air inlet of the air inlet duct is arranged to communicate with a fresh air inlet of the air conditioning unit, one side of the frame is provided with a mounting opening, the mounting opening is in communication with the air inlet duct, and a blocking piece is movably arranged at the mounting opening.

10. The air conditioning unit of claim 8, wherein: The body is formed with a mixing section, a fan section, a flow equalizing section, a filtering section, an air treatment section and a air supply section in sequence, the mixing section is provided with a return air inlet and the fresh air inlet, the fan section is provided with a fan, the filtering section is provided with a filter, the air treatment section is provided with a refrigeration assembly and / or a heating assembly and / or a humidifying assembly, and the air supply section is provided with an air supply outlet. The frame is mounted on the inner wall of the mixing section.

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