Modularized water-cooling direct expansion air conditioning unit

Abstract

The utility model belongs to the technical field of air conditioners, and particularly relates to a modular water-cooling direct expansion air conditioning unit. The modularized water-cooling direct-expansion air conditioning unit comprises a host system section and a filter fan section. Wherein the main machine system section comprises a first box body frame, a main machine system and an evaporator assembly are arranged in the first box body frame, and the main machine system is communicated with the evaporator assembly through a piping assembly. The filter fan section comprises a second box frame, the second box frame is detachably connected with the first box frame, and a filter screen assembly and a fan wall assembly are arranged in the second box frame at intervals. By means of the technical scheme, the piping assembly does not need to be divided into different assembly sections, the procedures of welding, leakage detecting, vacuumizing and the like of the pipeline can be completed only in the main machine system section, and therefore the overall installation and debugging process of a unit can be simplified, energy consumption can be saved, and the product installation and use cost can be reduced.

Description

Technical Field

[0001] The present application belongs to the technical field of air conditioning, and specifically relates to a modular water-cooled direct expansion air conditioning unit. Background Art

[0002] In subways, stations, shopping malls and other places with large areas and large cooling capacity requirements, the refrigeration system generally uses water-cooled direct expansion air-conditioning units. Water-cooled direct expansion air-conditioning units combine the main system and the terminal into a complete machine and eliminate the chilled water transportation system to achieve the purpose of saving energy and reducing engineering installation costs.

[0003] However, current water-cooled direct expansion air-conditioning units are generally designed with large overall dimensions due to the demand for large cooling capacity and large air volume, and are generally produced using a panel frame structure and multiple sections. This results in the piping components being divided into different assembly sections when the units are divided into sections according to a conventional layout. It is necessary to perform leak detection and vacuum extraction processes on the refrigerant pipelines divided into different assembly sections during production, and it is also necessary to complete pipeline welding and pipeline vacuum extraction before on-site assembly and commissioning, which brings great inconvenience to the installation and commissioning of the units. Utility Model Content

[0004] The purpose of this application is to at least solve the problem that the current water-cooled direct expansion air conditioning units have complex steps and cumbersome processes in the production stage and on-site installation and commissioning stage. This purpose is achieved by the following means:

[0005] The present application proposes a modular water-cooled direct expansion air conditioning unit, comprising: a host system section, comprising a first box frame, a host system is arranged in the first box frame, the host system comprises a host and an evaporator assembly, the host is connected to the evaporator assembly through a pipe assembly;

[0006] The filter fan section comprises a second box frame, wherein the second box frame is detachably connected to the first box frame, and a filter assembly and a fan wall assembly are arranged at intervals in the second box frame.

[0007] According to the modular water-cooled direct expansion air-conditioning unit provided by the present application, the water-cooled direct expansion air-conditioning unit is divided into a main engine system section and a filter fan section that can be produced independently of each other. After the main engine system section and the filter fan section are independently produced, they are transported to the site for assembly and connection. The overall unit has fewer sections, thereby simplifying the production, hoisting, transportation, assembly and other links. In addition, by arranging the main engine, piping assembly and evaporator assembly in the first box frame of the main engine system section, the main engine is connected to the evaporator assembly through the piping assembly. Therefore, the piping assembly does not need to be divided into different assembly sections, and the welding, leak detection, vacuuming and other processes of the pipeline can be completed only in the main engine system section, thereby simplifying the overall installation and debugging process, and saving energy consumption, so as to reduce the cost of installation and use.

[0008] In addition, the modular water-cooled direct expansion air-conditioning unit according to the present application may also have the following additional technical features:

[0009] In some embodiments of the present application, the host is located on a side of the evaporator assembly that is away from the second box frame, and the filter assembly is located between the fan wall assembly and the evaporator assembly.

[0010] In some embodiments of the present application, the main unit includes a compressor, a condenser, a throttling device and a gas-liquid separator. The compressor is connected to the condenser, the throttling device and the evaporator assembly in sequence through the piping assembly to form a refrigerant circuit. The gas-liquid separator is arranged between the evaporator assembly and the compressor, and is respectively connected to the compressor and the evaporator assembly.

[0011] In some embodiments of the present application, a first water receiving tray is further provided in the first box frame, and the first water receiving tray is provided below the water outlet of the condenser;

[0012] And / or, a second water receiving tray is further provided in the first box frame, and the second water receiving tray is provided below the evaporator assembly.

[0013] In some embodiments of the present application, the first box frame has a first opening on a side facing the second box frame; the evaporator assembly includes a first support frame and an evaporator, the first support frame is arranged in the first box frame, the evaporator is arranged on the first support frame and is shielded by the first opening.

[0014] In some embodiments of the present application, the evaporator includes a plurality of fin-tube heat exchangers, and the plurality of fin-tube heat exchangers are arranged along the same vertical plane.

[0015] In some embodiments of the present application, the second box frame has a second opening on a side facing the first box frame;

[0016] The filter assembly includes a second support frame and a filter arranged on the second support frame, the second support frame is arranged in the second box frame, the filter is arranged on the second support frame and covered by the second opening.

[0017] In some embodiments of the present application, the fan wall assembly includes a support plate and a fan assembly arranged on the support plate, the support plate is arranged in the second box frame, and the support plate is provided with an air guide port, and the fan assembly is arranged at the air guide port.

[0018] In some embodiments of the present application, an air inlet is provided on the top of the first box frame;

[0019] And / or, an air outlet is provided on the top of the second box frame.

[0020] In some embodiments of the present application, the second box frame includes a first sub-frame and a second sub-frame, the first sub-frame is located between the first box frame and the second sub-frame, and is used to connect to the first box frame and the second sub-frame respectively;

[0021] Wherein, the filter assembly is arranged in the first sub-frame, and the fan wall assembly is arranged in the second sub-frame.

[0022] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. In addition, the same reference numerals are used throughout the accompanying drawings to represent the same components. Among them:

[0024] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. In addition, the same reference numerals are used throughout the accompanying drawings to represent the same components. Among them:

[0025] Figure 1 This is a schematic diagram of the exploded structure of a modular water-cooled direct expansion air-conditioning unit provided according to an embodiment of the present application;

[0026] Figure 2 This is a schematic diagram of the assembly structure of a modular water-cooled direct expansion air-conditioning unit provided according to an embodiment of the present application;

[0027] Figure 3 The figure is a schematic diagram of the exploded structure of a filter fan section provided according to an embodiment of the present application.

[0028] The reference numerals in the accompanying drawings represent the following:

[0029] 1000. Modular water-cooled direct expansion air conditioning unit;

[0030] 100, host system section; 200, filter fan section;

[0031] 10. first box frame; 11. host system; 12. first opening; 13. air inlet; 111. compressor; 112. condenser; 113. piping assembly; 114. evaporator assembly; 115. first water receiving tray; 116. second water receiving tray;

[0032] 20. Second box frame; 21. First sub-frame; 22. Second sub-frame; 211. Second opening; 212. Filter assembly; 221. Fan wall assembly; 222. Air outlet. DETAILED DESCRIPTION

[0033] The exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present application and to fully convey the scope of the present application to those skilled in the art.

[0034] It should be understood that the terms used in the text are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used in the text may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described in the text are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0035] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0036] For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative descriptors used in the text are interpreted accordingly.

[0037] See also Figure 1 and Figure 2 A modular water-cooled direct expansion air conditioning unit 1000 proposed in an embodiment of the present application includes a host system section 100 and a filter fan section 200. The host system section 100 includes a first box frame 10, in which a host system 11 is arranged, and the host system 11 includes a host and an evaporator assembly 114, and the host is connected to the evaporator assembly 114 through a pipe assembly 113. The filter fan section 200 includes a second box frame 20, which is connected to the first box frame 10 in a detachable manner, and a filter assembly 212 and a fan wall assembly 221 are arranged in the second box frame 20 at intervals.

[0038] In this embodiment, the modular water-cooled direct expansion air conditioning unit 1000 is an air conditioning system that can rely on water and air for heat exchange, thereby taking away the high temperature of the condenser 112, and then realizing refrigeration. For example, the water can be cooled by a cooling water tower, a cooling water pump, etc., so that the refrigerant in the condenser 112 is cooled, and the cooled refrigerant flows into the evaporator, and the circulating water is cooled by the evaporator, and then sent to the indoor terminal equipment to exchange heat with the indoor air to achieve temperature regulation. In addition, in addition to the daily cooling function, the water-cooled direct expansion air conditioning unit can be provided with an air inlet 13 and an air outlet 222, as well as a filter assembly 212, so that it has the effects of ventilation, dust removal, and deodorization.

[0039] The main engine system section 100 and the filter fan section 200 are two parts that can be produced independently of each other in the water-cooled direct expansion air conditioning unit. By dividing the water-cooled direct expansion air conditioning unit into the main engine system section 100 and the filter fan section 200 that can be produced independently of each other, after the main engine system section 100 and the filter fan section 200 are independently produced, they are transported to the site for assembly and connection. Since the entire air conditioning unit has fewer sections and the sections can be produced independently, the production, hoisting, transportation, assembly and other links can be simplified. In addition, by integrating the main engine, the piping assembly 113 and the evaporator assembly 114 in the first box frame 10 of the main engine system section 100, the main engine is connected to the evaporator assembly 114 through the piping assembly 113. Therefore, the piping assembly 113 does not need to be divided into the filter fan section 200 for assembly and connection, and the welding, leak detection, vacuuming and other processes of the pipeline can be completed only in the main engine system section 100, thereby simplifying the overall installation and commissioning process of the unit, saving energy consumption, and reducing the cost of installation and use.

[0040] Please attend Figure 1 According to some embodiments of the present application, the host is located on a side of the evaporator assembly 114 away from the second box frame 20 , and the filter assembly 212 is located between the fan wall assembly 221 and the evaporator assembly 114 .

[0041] In this embodiment, the air is filtered, dusted, and deodorized by the filter assembly 212 before flowing to the fan wall assembly 221, and then discharged to the target space through the fan wall assembly 221, thereby improving the quality of the air environment.

[0042] Please attend Figure 1 According to some embodiments of the present application, the main unit includes a compressor 111, a condenser 112, a throttling device (not shown in the figure) and a gas-liquid separator (not shown in the figure). The compressor 111 is connected to the condenser 112, the throttling device and the evaporator assembly 114 in sequence through a piping assembly 113 to form a refrigerant circuit. The gas-liquid separator is arranged between the evaporator assembly 114 and the compressor 111, and is respectively connected to the compressor 111 and the evaporator assembly 114.

[0043] In this embodiment, the compressor 111, condenser 112, throttling device and evaporator assembly 114 in the host system section 100 are connected through the piping assembly 113 to form a refrigerant circuit capable of refrigeration cycle, and by arranging a gas-liquid separator in the refrigerant circuit between the evaporator assembly 114 and the compressor 111, the gas-liquid separator is used to separate the gas and liquid of the refrigerant between the evaporator assembly 114 and the compressor 111. The gas-liquid separator can carry excessive liquid droplets with the low-pressure and low-temperature steam returning to the compressor 111, thereby reducing the risk of liquid refrigerant entering the compressor 111 and causing liquid hammer to the compressor 111. At the same time, the risk of excessive refrigerant diluting the oil of the compressor 111 can also be reduced, which helps to improve the performance and service life of the compressor 111.

[0044] Please attend Figure 2 According to some embodiments of the present application, a first water receiving tray 115 is further provided in the first box frame 10 , and the first water receiving tray 115 is provided below the water outlet of the condenser 112 .

[0045] In this embodiment, by setting a first water receiving tray 115 below the water outlet of the condenser 112, the first water receiving tray 115 can receive the condensed water generated in the condenser 112 during the condenser maintenance, and can discharge the collected condensed water to the outside of the first box frame 10 through the drain pipe.

[0046] According to some embodiments of the present application, a second water receiving tray 116 is further disposed in the first box frame 10 , and the second water receiving tray 116 is disposed below the evaporator assembly 114 .

[0047] By arranging the second water receiving tray 116 below the evaporator assembly 114 , the second water receiving tray 116 can receive the defrost water generated by the evaporator assembly 114 and discharge the collected defrost water to the outside of the first box frame 10 through the drain pipe.

[0048] According to some embodiments of the present application, the condenser 112 includes a shell and tube condenser 112 .

[0049] In this embodiment, the shell and tube condenser 112 can use water as a cooling medium to take away the heat released by the refrigerant during refrigeration. In addition, the shell and tube condenser 112 has a high heat transfer coefficient, uses less cooling water, and is easy to operate and manage.

[0050] Please attend Figure 1 According to some embodiments of the present application, the first box frame 10 has a first opening 12 on one side facing the second box frame 20; the evaporator assembly 114 includes a first support frame and an evaporator, the first support frame is arranged in the first box frame 10, the evaporator is arranged on the first support frame, and is shielded by the first opening 12.

[0051] In this embodiment, the first box frame 10 has no side panel on the side facing the second box frame 20 , thereby forming a first opening 12 , thereby enabling the internal space of the first box frame 10 to communicate with the internal space of the second box frame 20 .

[0052] By arranging the evaporator assembly 114 on the side of the first box frame 10 close to the second box frame 20, including the first support frame and the evaporator arranged on the first support frame, the refrigerant after the condensation of the condenser 112 can be transformed into a low-pressure and low-temperature state after the evaporator absorbs heat and evaporates, and then flows back to the compressor 111, and the hot air in the first box frame 10 is reduced in temperature after the heat exchange of the evaporator to become cold air, and then passes through the filter assembly 212 and is discharged from the second box frame 20 to the target space (such as a subway car or a shopping mall) using the fan wall assembly 221. In addition, the evaporator is shielded from the first opening 12 in the vertical direction, and when the gas flows from the evaporator, it helps to improve the heat exchange efficiency of the gas in the first box frame 10.

[0053] Furthermore, in some embodiments, a water receiving tray may be provided at the bottom of the evaporator, so as to receive the defrosting water on the surface of the evaporator when the evaporator is defrosting, and discharge it to the outside of the first box frame 10 through a drain pipe.

[0054] According to some embodiments of the present application, the evaporator includes a plurality of fin-tube heat exchangers, and the plurality of fin-tube heat exchangers are arranged along the same vertical plane.

[0055] In this embodiment, multiple fin-tube heat exchangers are interconnected, and by arranging multiple fin-tube heat exchangers along the same vertical plane, the occupied space can be reduced, the space utilization rate in the first box frame 10 can be improved, and the overall heat exchange area of ​​the evaporator can be increased, which helps to improve the heat exchange efficiency and further improve the refrigeration efficiency.

[0056] Please attend Figure 1 According to some embodiments of the present application, the second box frame 20 has a second opening 211 on the side facing the first box frame 10; the filter assembly 212 includes a second support frame and a filter arranged on the second support frame, the second support frame is arranged in the second box frame 20, the filter is arranged on the second support frame, and is blocked by the second opening 211.

[0057] In the present embodiment, it can be understood that the second box frame 20 has no side panel on the side facing the first box frame 10, so that a second opening 211 can be formed. After the second box frame 20 is assembled with the first box frame 10, the interior of the first box frame 10 can be connected with the interior space of the second box frame 20, so that when the fan assembly is running, cold air can flow from the first box frame 10 to the second box frame 20.

[0058] The filter can be one or multiple filters. The filter has the function of purifying the air. For example, it can purify harmful organic matter such as formaldehyde, benzene, ammonia, sulfur dioxide, carbon monoxide, nitrogen oxides, etc. In addition, the filter has a certain bactericidal effect, which can purify bacteria in the air, improve the quality of the air environment, and reduce the risk of airborne infectious diseases. At the same time, the filter can absorb dust in the air and reduce the adverse effects of dust particles on the operation of the air conditioning unit.

[0059] Please attend Figure 1 According to some embodiments of the present application, the fan wall assembly 221 includes a support plate and a fan assembly arranged on the support plate, the support plate is arranged in the second box frame 20, and the support plate is provided with an air guide port, the fan assembly is arranged on the side of the support plate away from the filter assembly 212, and corresponds to the position of the air guide port.

[0060] In this embodiment, exemplarily, the number of air guide outlets is multiple, the number of fan assemblies is the same as the number of air guide outlets, and the multiple fan assemblies are arranged in a one-to-one correspondence with the multiple air guide outlets, thereby improving the exhaust efficiency and improving the cooling efficiency of the water-cooled direct expansion air-conditioning unit.

[0061] Among them, the support plate is set corresponding to the filter assembly 212, and the support plate can be provided with an air guide tube, the air guide tube has an air guide port, and the fan assembly corresponding to the air guide port is set on the side of the support plate away from the filter, which is used to draw the cold air in the first box frame 10 into the first box frame 10, and discharge it from the first box frame 10 to the target space.

[0062] Specifically, the fan assembly includes a fan bracket, a motor and an impeller. The fan bracket is arranged on the side of the support plate away from the filter assembly 212, the motor is arranged on the fan bracket, the impeller is connected to the power output shaft of the motor and is arranged corresponding to the air guide port. When the motor is running, it drives the impeller to rotate to discharge the cold air to the target space.

[0063] Please attend Figure 1 According to some embodiments of the present application, an air inlet 13 is provided at the top of the first box frame 10 , and an air outlet 222 is provided at the top of the second box frame 20 .

[0064] In this embodiment, by setting an air inlet 13 at the top of the first box frame 10 and an air outlet 222 at the top of the second box frame 20, gas can enter the first box frame 10 from the air inlet 13 set at the top of the first box frame 10, and become cold air after heat exchange with the evaporator, so that the cold air can be discharged from the air outlet 222 at the top of the second box frame 20 to the target space when the fan assembly is running.

[0065] Please attend Figure 3According to some embodiments of the present application, the second box frame 20 includes a first sub-frame 21 and a second sub-frame 22, the first sub-frame 21 is located between the first box frame 10 and the second sub-frame 22, and is used to be connected to the first box frame 10 and the second sub-frame 22 respectively; wherein the filter assembly 212 is disposed in the first sub-frame 21, and the fan wall assembly 221 is disposed in the second sub-frame 22.

[0066] In this embodiment, illustratively, the first sub-frame 21 and the second sub-frame 22 can be independently produced and assembled, and can be spliced ​​and installed after being transported to the site.

[0067] Since there is no pipeline connection between the filter assembly 212 and the fan wall assembly 221, the second box frame 20 can be split into two sub-frames (i.e., the first sub-frame 21 and the second sub-frame 22), the filter assembly 212 and the first sub-frame 21 can be produced and assembled separately, and then the fan wall assembly 221 and the second sub-frame 22 can be produced and assembled separately, and finally the two sub-frames can be transported to the site for overall assembly, thereby further improving the production and assembly efficiency of the product.

[0068] In some embodiments, the air outlet 222 is disposed on the top of the second sub-frame 22 and is located on a side away from the first box frame 10 .

[0069] In some embodiments, the first box frame 10 and the second box frame 20 are provided with inspection ports on their sides. The inspection ports are used for operators to enter the first box frame 10 or the second box frame 20 to inspect and maintain the equipment inside the water-cooled direct expansion air-conditioning unit.

[0070] The above is only a preferred specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A modular water-cooled direct expansion air conditioning unit, It is characterized in that include: The host system section includes a first box frame, in which a host system is arranged, the host system includes a host and an evaporator assembly, and the host is connected to the evaporator assembly through a piping assembly; The filter fan section comprises a second box frame, wherein the second box frame is detachably connected to the first box frame, and a filter assembly and a fan wall assembly are arranged at intervals in the second box frame.

2. The modular water-cooled direct expansion air conditioning unit according to claim 1, It is characterized in that The host is located on a side of the evaporator assembly away from the second box frame, and the filter assembly is located between the fan wall assembly and the evaporator assembly.

3. The modular water-cooled direct expansion air conditioning unit according to claim 1, It is characterized in that The main unit includes a compressor, a condenser, a throttling device and a gas-liquid separator. The compressor is connected to the condenser, the throttling device and the evaporator assembly in sequence through the piping assembly to form a refrigerant circuit. The gas-liquid separator is arranged between the evaporator assembly and the compressor, and is respectively connected to the compressor and the evaporator assembly.

4. The modular water-cooled direct expansion air conditioning unit according to claim 3, It is characterized in that A first water receiving tray is also provided in the first box frame, and the first water receiving tray is provided below the water outlet of the condenser; And / or, a second water receiving tray is further provided in the first box frame, and the second water receiving tray is provided below the evaporator assembly.

5. The modular water-cooled direct expansion air conditioning unit according to any one of claims 1 to 4, It is characterized in that The first box frame has a first opening on one side facing the second box frame; The evaporator assembly includes a first support frame and an evaporator. The first support frame is arranged in the first box frame. The evaporator is arranged on the first support frame and is covered by the first opening.

6. The modular water-cooled direct expansion air conditioning unit according to claim 5, It is characterized in that The evaporator includes a plurality of fin-tube heat exchangers, and the plurality of fin-tube heat exchangers are arranged along the same vertical plane.

7. A modular water-cooled direct expansion air conditioning unit according to any one of claims 1 to 4, It is characterized in that The second box frame has a second opening on one side facing the first box frame; The filter assembly includes a second support frame and a filter arranged on the second support frame, the second support frame is arranged in the second box frame, the filter is arranged on the second support frame and covered by the second opening.

8. The modular water-cooled direct expansion air conditioning unit according to any one of claims 1 to 4, It is characterized in that The fan wall assembly includes a support plate and a fan assembly arranged on the support plate. The support plate is arranged in the second box frame, and the support plate is provided with an air guide port. The fan assembly is arranged at the air guide port.

9. The modular water-cooled direct expansion air conditioning unit according to any one of claims 1 to 4, It is characterized in that An air inlet is provided on the top of the first box frame; And / or, an air outlet is provided on the top of the second box frame.

10. The modular water-cooled direct expansion air conditioning unit according to any one of claims 1 to 4, It is characterized in that The second box frame includes a first sub-frame and a second sub-frame, the first sub-frame is located between the first box frame and the second sub-frame, and is used to be connected to the first box frame and the second sub-frame respectively; Wherein, the filter assembly is arranged in the first sub-frame, and the fan wall assembly is arranged in the second sub-frame.

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